aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-15 12:48:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-15 12:48:41 -0800
commit16008d641670571ff4cd750b416c7caf2d89f467 (patch)
tree6dc32821bd4576106cee50d52a90a8106a9d481f
parentb3c9dd182ed3bdcdaf0e42625a35924b0497afdc (diff)
parent85a0f7b220777cd3c232fd2f079db5c4a874c4ee (diff)
Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block
* 'for-3.3/drivers' of git://git.kernel.dk/linux-block: mtip32xx: do rebuild monitoring asynchronously xen-blkfront: Use kcalloc instead of kzalloc to allocate array mtip32xx: uninitialized variable in mtip_quiesce_io() mtip32xx: updates based on feedback xen-blkback: convert hole punching to discard request on loop devices xen/blkback: Move processing of BLKIF_OP_DISCARD from dispatch_rw_block_io xen/blk[front|back]: Enhance discard support with secure erasing support. xen/blk[front|back]: Squash blkif_request_rw and blkif_request_discard together mtip32xx: update to new ->make_request() API mtip32xx: add module.h include to avoid conflict with moduleh tree mtip32xx: mark a few more items static mtip32xx: ensure that all local functions are static mtip32xx: cleanup compat ioctl handling mtip32xx: fix warnings/errors on 32-bit compiles block: Add driver for Micron RealSSD pcie flash cards
-rw-r--r--drivers/block/Kconfig2
-rw-r--r--drivers/block/Makefile1
-rw-r--r--drivers/block/mtip32xx/Kconfig9
-rw-r--r--drivers/block/mtip32xx/Makefile5
-rw-r--r--drivers/block/mtip32xx/mtip32xx.c3651
-rw-r--r--drivers/block/mtip32xx/mtip32xx.h423
-rw-r--r--drivers/block/xen-blkback/blkback.c84
-rw-r--r--drivers/block/xen-blkback/common.h67
-rw-r--r--drivers/block/xen-blkback/xenbus.c12
-rw-r--r--drivers/block/xen-blkfront.c79
-rw-r--r--include/xen/interface/io/blkif.h40
11 files changed, 4261 insertions, 112 deletions
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 6f07ec1c2f5..a30aa103f95 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -116,6 +116,8 @@ config PARIDE
source "drivers/block/paride/Kconfig"
+source "drivers/block/mtip32xx/Kconfig"
+
config BLK_CPQ_DA
tristate "Compaq SMART2 support"
depends on PCI && VIRT_TO_BUS
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 76646e9a1c9..ad7b74a44ef 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -39,5 +39,6 @@ obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o
obj-$(CONFIG_XEN_BLKDEV_BACKEND) += xen-blkback/
obj-$(CONFIG_BLK_DEV_DRBD) += drbd/
obj-$(CONFIG_BLK_DEV_RBD) += rbd.o
+obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx/
swim_mod-y := swim.o swim_asm.o
diff --git a/drivers/block/mtip32xx/Kconfig b/drivers/block/mtip32xx/Kconfig
new file mode 100644
index 00000000000..b5dd14e072f
--- /dev/null
+++ b/drivers/block/mtip32xx/Kconfig
@@ -0,0 +1,9 @@
+#
+# mtip32xx device driver configuration
+#
+
+config BLK_DEV_PCIESSD_MTIP32XX
+ tristate "Block Device Driver for Micron PCIe SSDs"
+ depends on HOTPLUG_PCI_PCIE
+ help
+ This enables the block driver for Micron PCIe SSDs.
diff --git a/drivers/block/mtip32xx/Makefile b/drivers/block/mtip32xx/Makefile
new file mode 100644
index 00000000000..4fbef8c8329
--- /dev/null
+++ b/drivers/block/mtip32xx/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Block device driver for Micron PCIe SSD
+#
+
+obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx.o
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
new file mode 100644
index 00000000000..b74eab70c3d
--- /dev/null
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -0,0 +1,3651 @@
+/*
+ * Driver for the Micron P320 SSD
+ * Copyright (C) 2011 Micron Technology, Inc.
+ *
+ * Portions of this code were derived from works subjected to the
+ * following copyright:
+ * Copyright (C) 2009 Integrated Device Technology, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/ata.h>
+#include <linux/delay.h>
+#include <linux/hdreg.h>
+#include <linux/uaccess.h>
+#include <linux/random.h>
+#include <linux/smp.h>
+#include <linux/compat.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <linux/dma-mapping.h>
+#include <linux/idr.h>
+#include <linux/kthread.h>
+#include <../drivers/ata/ahci.h>
+#include "mtip32xx.h"
+
+#define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32)
+#define HW_CMD_TBL_SZ (AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
+#define HW_CMD_TBL_AR_SZ (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
+#define HW_PORT_PRIV_DMA_SZ \
+ (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)
+
+#define HOST_HSORG 0xFC
+#define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
+#define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
+#define HSORG_HWREV 0xFF00
+#define HSORG_STYLE 0x8
+#define HSORG_SLOTGROUPS 0x7
+
+#define PORT_COMMAND_ISSUE 0x38
+#define PORT_SDBV 0x7C
+
+#define PORT_OFFSET 0x100
+#define PORT_MEM_SIZE 0x80
+
+#define PORT_IRQ_ERR \
+ (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
+ PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
+ PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
+ PORT_IRQ_OVERFLOW)
+#define PORT_IRQ_LEGACY \
+ (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
+#define PORT_IRQ_HANDLED \
+ (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
+ PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
+ PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
+#define DEF_PORT_IRQ \
+ (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
+
+/* product numbers */
+#define MTIP_PRODUCT_UNKNOWN 0x00
+#define MTIP_PRODUCT_ASICFPGA 0x11
+
+/* Device instance number, incremented each time a device is probed. */
+static int instance;
+
+/*
+ * Global variable used to hold the major block device number
+ * allocated in mtip_init().
+ */
+static int mtip_major;
+
+static DEFINE_SPINLOCK(rssd_index_lock);
+static DEFINE_IDA(rssd_index_ida);
+
+static int mtip_block_initialize(struct driver_data *dd);
+
+#ifdef CONFIG_COMPAT
+struct mtip_compat_ide_task_request_s {
+ __u8 io_ports[8];
+ __u8 hob_ports[8];
+ ide_reg_valid_t out_flags;
+ ide_reg_valid_t in_flags;
+ int data_phase;
+ int req_cmd;
+ compat_ulong_t out_size;
+ compat_ulong_t in_size;
+};
+#endif
+
+/*
+ * This function check_for_surprise_removal is called
+ * while card is removed from the system and it will
+ * read the vendor id from the configration space
+ *
+ * @pdev Pointer to the pci_dev structure.
+ *
+ * return value
+ * true if device removed, else false
+ */
+static bool mtip_check_surprise_removal(struct pci_dev *pdev)
+{
+ u16 vendor_id = 0;
+
+ /* Read the vendorID from the configuration space */
+ pci_read_config_word(pdev, 0x00, &vendor_id);
+ if (vendor_id == 0xFFFF)
+ return true; /* device removed */
+
+ return false; /* device present */
+}
+
+/*
+ * This function is called for clean the pending command in the
+ * command slot during the surprise removal of device and return
+ * error to the upper layer.
+ *
+ * @dd Pointer to the DRIVER_DATA structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_command_cleanup(struct driver_data *dd)
+{
+ int group = 0, commandslot = 0, commandindex = 0;
+ struct mtip_cmd *command;
+ struct mtip_port *port = dd->port;
+
+ for (group = 0; group < 4; group++) {
+ for (commandslot = 0; commandslot < 32; commandslot++) {
+ if (!(port->allocated[group] & (1 << commandslot)))
+ continue;
+
+ commandindex = group << 5 | commandslot;
+ command = &port->commands[commandindex];
+
+ if (atomic_read(&command->active)
+ && (command->async_callback)) {
+ command->async_callback(command->async_data,
+ -ENODEV);
+ command->async_callback = NULL;
+ command->async_data = NULL;
+ }
+
+ dma_unmap_sg(&port->dd->pdev->dev,
+ command->sg,
+ command->scatter_ents,
+ command->direction);
+ }
+ }
+
+ up(&port->cmd_slot);
+
+ atomic_set(&dd->drv_cleanup_done, true);
+}
+
+/*
+ * Obtain an empty command slot.
+ *
+ * This function needs to be reentrant since it could be called
+ * at the same time on multiple CPUs. The allocation of the
+ * command slot must be atomic.
+ *
+ * @port Pointer to the port data structure.
+ *
+ * return value
+ * >= 0 Index of command slot obtained.
+ * -1 No command slots available.
+ */
+static int get_slot(struct mtip_port *port)
+{
+ int slot, i;
+ unsigned int num_command_slots = port->dd->slot_groups * 32;
+
+ /*
+ * Try 10 times, because there is a small race here.
+ * that's ok, because it's still cheaper than a lock.
+ *
+ * Race: Since this section is not protected by lock, same bit
+ * could be chosen by different process contexts running in
+ * different processor. So instead of costly lock, we are going
+ * with loop.
+ */
+ for (i = 0; i < 10; i++) {
+ slot = find_next_zero_bit(port->allocated,
+ num_command_slots, 1);
+ if ((slot < num_command_slots) &&
+ (!test_and_set_bit(slot, port->allocated)))
+ return slot;
+ }
+ dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n");
+
+ if (mtip_check_surprise_removal(port->dd->pdev)) {
+ /* Device not present, clean outstanding commands */
+ mtip_command_cleanup(port->dd);
+ }
+ return -1;
+}
+
+/*
+ * Release a command slot.
+ *
+ * @port Pointer to the port data structure.
+ * @tag Tag of command to release
+ *
+ * return value
+ * None
+ */
+static inline void release_slot(struct mtip_port *port, int tag)
+{
+ smp_mb__before_clear_bit();
+ clear_bit(tag, port->allocated);
+ smp_mb__after_clear_bit();
+}
+
+/*
+ * Reset the HBA (without sleeping)
+ *
+ * Just like hba_reset, except does not call sleep, so can be
+ * run from interrupt/tasklet context.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 The reset was successful.
+ * -1 The HBA Reset bit did not clear.
+ */
+static int hba_reset_nosleep(struct driver_data *dd)
+{
+ unsigned long timeout;
+
+ /* Chip quirk: quiesce any chip function */
+ mdelay(10);
+
+ /* Set the reset bit */
+ writel(HOST_RESET, dd->mmio + HOST_CTL);
+
+ /* Flush */
+ readl(dd->mmio + HOST_CTL);
+
+ /*
+ * Wait 10ms then spin for up to 1 second
+ * waiting for reset acknowledgement
+ */
+ timeout = jiffies + msecs_to_jiffies(1000);
+ mdelay(10);
+ while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
+ && time_before(jiffies, timeout))
+ mdelay(1);
+
+ if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
+ return -1;
+
+ return 0;
+}
+
+/*
+ * Issue a command to the hardware.
+ *
+ * Set the appropriate bit in the s_active and Command Issue hardware
+ * registers, causing hardware command processing to begin.
+ *
+ * @port Pointer to the port structure.
+ * @tag The tag of the command to be issued.
+ *
+ * return value
+ * None
+ */
+static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
+{
+ unsigned long flags = 0;
+
+ atomic_set(&port->commands[tag].active, 1);
+
+ spin_lock_irqsave(&port->cmd_issue_lock, flags);
+
+ writel((1 << MTIP_TAG_BIT(tag)),
+ port->s_active[MTIP_TAG_INDEX(tag)]);
+ writel((1 << MTIP_TAG_BIT(tag)),
+ port->cmd_issue[MTIP_TAG_INDEX(tag)]);
+
+ spin_unlock_irqrestore(&port->cmd_issue_lock, flags);
+}
+
+/*
+ * Enable/disable the reception of FIS
+ *
+ * @port Pointer to the port data structure
+ * @enable 1 to enable, 0 to disable
+ *
+ * return value
+ * Previous state: 1 enabled, 0 disabled
+ */
+static int mtip_enable_fis(struct mtip_port *port, int enable)
+{
+ u32 tmp;
+
+ /* enable FIS reception */
+ tmp = readl(port->mmio + PORT_CMD);
+ if (enable)
+ writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
+ else
+ writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
+
+ /* Flush */
+ readl(port->mmio + PORT_CMD);
+
+ return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
+}
+
+/*
+ * Enable/disable the DMA engine
+ *
+ * @port Pointer to the port data structure
+ * @enable 1 to enable, 0 to disable
+ *
+ * return value
+ * Previous state: 1 enabled, 0 disabled.
+ */
+static int mtip_enable_engine(struct mtip_port *port, int enable)
+{
+ u32 tmp;
+
+ /* enable FIS reception */
+ tmp = readl(port->mmio + PORT_CMD);
+ if (enable)
+ writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
+ else
+ writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
+
+ readl(port->mmio + PORT_CMD);
+ return (((tmp & PORT_CMD_START) == PORT_CMD_START));
+}
+
+/*
+ * Enables the port DMA engine and FIS reception.
+ *
+ * return value
+ * None
+ */
+static inline void mtip_start_port(struct mtip_port *port)
+{
+ /* Enable FIS reception */
+ mtip_enable_fis(port, 1);
+
+ /* Enable the DMA engine */
+ mtip_enable_engine(port, 1);
+}
+
+/*
+ * Deinitialize a port by disabling port interrupts, the DMA engine,
+ * and FIS reception.
+ *
+ * @port Pointer to the port structure
+ *
+ * return value
+ * None
+ */
+static inline void mtip_deinit_port(struct mtip_port *port)
+{
+ /* Disable interrupts on this port */
+ writel(0, port->mmio + PORT_IRQ_MASK);
+
+ /* Disable the DMA engine */
+ mtip_enable_engine(port, 0);
+
+ /* Disable FIS reception */
+ mtip_enable_fis(port, 0);
+}
+
+/*
+ * Initialize a port.
+ *
+ * This function deinitializes the port by calling mtip_deinit_port() and
+ * then initializes it by setting the command header and RX FIS addresses,
+ * clearing the SError register and any pending port interrupts before
+ * re-enabling the default set of port interrupts.
+ *
+ * @port Pointer to the port structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_init_port(struct mtip_port *port)
+{
+ int i;
+ mtip_deinit_port(port);
+
+ /* Program the command list base and FIS base addresses */
+ if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
+ writel((port->command_list_dma >> 16) >> 16,
+ port->mmio + PORT_LST_ADDR_HI);
+ writel((port->rxfis_dma >> 16) >> 16,
+ port->mmio + PORT_FIS_ADDR_HI);
+ }
+
+ writel(port->command_list_dma & 0xFFFFFFFF,
+ port->mmio + PORT_LST_ADDR);
+ writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
+
+ /* Clear SError */
+ writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
+
+ /* reset the completed registers.*/
+ for (i = 0; i < port->dd->slot_groups; i++)
+ writel(0xFFFFFFFF, port->completed[i]);
+
+ /* Clear any pending interrupts for this port */
+ writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
+
+ /* Enable port interrupts */
+ writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
+}
+
+/*
+ * Restart a port
+ *
+ * @port Pointer to the port data structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_restart_port(struct mtip_port *port)
+{
+ unsigned long timeout;
+
+ /* Disable the DMA engine */
+ mtip_enable_engine(port, 0);
+
+ /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
+ timeout = jiffies + msecs_to_jiffies(500);
+ while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
+ && time_before(jiffies, timeout))
+ ;
+
+ /*
+ * Chip quirk: escalate to hba reset if
+ * PxCMD.CR not clear after 500 ms
+ */
+ if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
+ dev_warn(&port->dd->pdev->dev,
+ "PxCMD.CR not clear, escalating reset\n");
+
+ if (hba_reset_nosleep(port->dd))
+ dev_err(&port->dd->pdev->dev,
+ "HBA reset escalation failed.\n");
+
+ /* 30 ms delay before com reset to quiesce chip */
+ mdelay(30);
+ }
+
+ dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
+
+ /* Set PxSCTL.DET */
+ writel(readl(port->mmio + PORT_SCR_CTL) |
+ 1, port->mmio + PORT_SCR_CTL);
+ readl(port->mmio + PORT_SCR_CTL);
+
+ /* Wait 1 ms to quiesce chip function */
+ timeout = jiffies + msecs_to_jiffies(1);
+ while (time_before(jiffies, timeout))
+ ;
+
+ /* Clear PxSCTL.DET */
+ writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
+ port->mmio + PORT_SCR_CTL);
+ readl(port->mmio + PORT_SCR_CTL);
+
+ /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
+ timeout = jiffies + msecs_to_jiffies(500);
+ while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
+ && time_before(jiffies, timeout))
+ ;
+
+ if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
+ dev_warn(&port->dd->pdev->dev,
+ "COM reset failed\n");
+
+ /* Clear SError, the PxSERR.DIAG.x should be set so clear it */
+ writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
+
+ /* Enable the DMA engine */
+ mtip_enable_engine(port, 1);
+}
+
+/*
+ * Called periodically to see if any read/write commands are
+ * taking too long to complete.
+ *
+ * @data Pointer to the PORT data structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_timeout_function(unsigned long int data)
+{
+ struct mtip_port *port = (struct mtip_port *) data;
+ struct host_to_dev_fis *fis;
+ struct mtip_cmd *command;
+ int tag, cmdto_cnt = 0;
+ unsigned int bit, group;
+ unsigned int num_command_slots = port->dd->slot_groups * 32;
+
+ if (unlikely(!port))
+ return;
+
+ if (atomic_read(&port->dd->resumeflag) == true) {
+ mod_timer(&port->cmd_timer,
+ jiffies + msecs_to_jiffies(30000));
+ return;
+ }
+
+ for (tag = 0; tag < num_command_slots; tag++) {
+ /*
+ * Skip internal command slot as it has
+ * its own timeout mechanism
+ */
+ if (tag == MTIP_TAG_INTERNAL)
+ continue;
+
+ if (atomic_read(&port->commands[tag].active) &&
+ (time_after(jiffies, port->commands[tag].comp_time))) {
+ group = tag >> 5;
+ bit = tag & 0x1F;
+
+ command = &port->commands[tag];
+ fis = (struct host_to_dev_fis *) command->command;
+
+ dev_warn(&port->dd->pdev->dev,
+ "Timeout for command tag %d\n", tag);
+
+ cmdto_cnt++;
+ if (cmdto_cnt == 1)
+ set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
+
+ /*
+ * Clear the completed bit. This should prevent
+ * any interrupt handlers from trying to retire
+ * the command.
+ */
+ writel(1 << bit, port->completed[group]);
+
+ /* Call the async completion callback. */
+ if (likely(command->async_callback))
+ command->async_callback(command->async_data,
+ -EIO);
+ command->async_callback = NULL;
+ command->comp_func = NULL;
+
+ /* Unmap the DMA scatter list entries */
+ dma_unmap_sg(&port->dd->pdev->dev,
+ command->sg,
+ command->scatter_ents,
+ command->direction);
+
+ /*
+ * Clear the allocated bit and active tag for the
+ * command.
+ */
+ atomic_set(&port->commands[tag].active, 0);
+ release_slot(port, tag);
+
+ up(&port->cmd_slot);
+ }
+ }
+
+ if (cmdto_cnt) {
+ dev_warn(&port->dd->pdev->dev,
+ "%d commands timed out: restarting port",
+ cmdto_cnt);
+ mtip_restart_port(port);
+ clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
+ wake_up_interruptible(&port->svc_wait);
+ }
+
+ /* Restart the timer */
+ mod_timer(&port->cmd_timer,
+ jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
+}
+
+/*
+ * IO completion function.
+ *
+ * This completion function is called by the driver ISR when a
+ * command that was issued by the kernel completes. It first calls the
+ * asynchronous completion function which normally calls back into the block
+ * layer passing the asynchronous callback data, then unmaps the
+ * scatter list associated with the completed command, and finally
+ * clears the allocated bit associated with the completed command.
+ *
+ * @port Pointer to the port data structure.
+ * @tag Tag of the command.
+ * @data Pointer to driver_data.
+ * @status Completion status.
+ *
+ * return value
+ * None
+ */
+static void mtip_async_complete(struct mtip_port *port,
+ int tag,
+ void *data,
+ int status)
+{
+ struct mtip_cmd *command;
+ struct driver_data *dd = data;
+ int cb_status = status ? -EIO : 0;
+
+ if (unlikely(!dd) || unlikely(!port))
+ return;
+
+ command = &port->commands[tag];
+
+ if (unlikely(status == PORT_IRQ_TF_ERR)) {
+ dev_warn(&port->dd->pdev->dev,
+ "Command tag %d failed due to TFE\n", tag);
+ }
+
+ /* Upper layer callback */
+ if (likely(command->async_callback))
+ command->async_callback(command->async_data, cb_status);
+
+ command->async_callback = NULL;
+ command->comp_func = NULL;
+
+ /* Unmap the DMA scatter list entries */
+ dma_unmap_sg(&dd->pdev->dev,
+ command->sg,
+ command->scatter_ents,
+ command->direction);
+
+ /* Clear the allocated and active bits for the command */
+ atomic_set(&port->commands[tag].active, 0);
+ release_slot(port, tag);
+
+ up(&port->cmd_slot);
+}
+
+/*
+ * Internal command completion callback function.
+ *
+ * This function is normally called by the driver ISR when an internal
+ * command completed. This function signals the command completion by
+ * calling complete().
+ *
+ * @port Pointer to the port data structure.
+ * @tag Tag of the command that has completed.
+ * @data Pointer to a completion structure.
+ * @status Completion status.
+ *
+ * return value
+ * None
+ */
+static void mtip_completion(struct mtip_port *port,
+ int tag,
+ void *data,
+ int status)
+{
+ struct mtip_cmd *command = &port->commands[tag];
+ struct completion *waiting = data;
+ if (unlikely(status == PORT_IRQ_TF_ERR))
+ dev_warn(&port->dd->pdev->dev,
+ "Internal command %d completed with TFE\n", tag);
+
+ command->async_callback = NULL;
+ command->comp_func = NULL;
+
+ complete(waiting);
+}
+
+/*
+ * Helper function for tag logging
+ */
+static void print_tags(struct driver_data *dd,
+ char *msg,
+ unsigned long *tagbits)
+{
+ unsigned int tag, count = 0;
+
+ for (tag = 0; tag < (dd->slot_groups) * 32; tag++) {
+ if (test_bit(tag, tagbits))
+ count++;
+ }
+ if (count)
+ dev_info(&dd->pdev->dev, "%s [%i tags]\n", msg, count);
+}
+
+/*
+ * Handle an error.
+ *
+ * @dd Pointer to the DRIVER_DATA structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_handle_tfe(struct driver_data *dd)
+{
+ int group, tag, bit, reissue;
+ struct mtip_port *port;
+ struct mtip_cmd *command;
+ u32 completed;
+ struct host_to_dev_fis *fis;
+ unsigned long tagaccum[SLOTBITS_IN_LONGS];
+
+ dev_warn(&dd->pdev->dev, "Taskfile error\n");
+
+ port = dd->port;
+
+ /* Stop the timer to prevent command timeouts. */
+ del_timer(&port->cmd_timer);
+
+ /* Set eh_active */
+ set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
+
+ /* Loop through all the groups */
+ for (group = 0; group < dd->slot_groups; group++) {
+ completed = readl(port->completed[group]);
+
+ /* clear completed status register in the hardware.*/
+ writel(completed, port->completed[group]);
+
+ /* clear the tag accumulator */
+ memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
+
+ /* Process successfully completed commands */
+ for (bit = 0; bit < 32 && completed; bit++) {
+ if (!(completed & (1<<bit)))
+ continue;
+ tag = (group << 5) + bit;
+
+ /* Skip the internal command slot */
+ if (tag == MTIP_TAG_INTERNAL)
+ continue;
+
+ command = &port->commands[tag];
+ if (likely(command->comp_func)) {
+ set_bit(tag, tagaccum);
+ atomic_set(&port->commands[tag].active, 0);
+ command->comp_func(port,
+ tag,
+ command->comp_data,
+ 0);
+ } else {
+ dev_err(&port->dd->pdev->dev,
+ "Missing completion func for tag %d",
+ tag);
+ if (mtip_check_surprise_removal(dd->pdev)) {
+ mtip_command_cleanup(dd);
+ /* don't proceed further */
+ return;
+ }
+ }
+ }
+ }
+ print_tags(dd, "TFE tags completed:", tagaccum);
+
+ /* Restart the port */
+ mdelay(20);
+ mtip_restart_port(port);
+
+ /* clear the tag accumulator */
+ memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
+
+ /* Loop through all the groups */
+ for (group = 0; group < dd->slot_groups; group++) {
+ for (bit = 0; bit < 32; bit++) {
+ reissue = 1;
+ tag = (group << 5) + bit;
+
+ /* If the active bit is set re-issue the command */
+ if (atomic_read(&port->commands[tag].active) == 0)
+ continue;
+
+ fis = (struct host_to_dev_fis *)
+ port->commands[tag].command;
+
+ /* Should re-issue? */
+ if (tag == MTIP_TAG_INTERNAL ||
+ fis->command == ATA_CMD_SET_FEATURES)
+ reissue = 0;
+
+ /*
+ * First check if this command has
+ * exceeded its retries.
+ */
+ if (reissue &&
+ (port->commands[tag].retries-- > 0)) {
+
+ set_bit(tag, tagaccum);
+
+ /* Update the timeout value. */
+ port->commands[tag].comp_time =
+ jiffies + msecs_to_jiffies(
+ MTIP_NCQ_COMMAND_TIMEOUT_MS);
+ /* Re-issue the command. */
+ mtip_issue_ncq_command(port, tag);
+
+ continue;
+ }
+
+ /* Retire a command that will not be reissued */
+ dev_warn(&port->dd->pdev->dev,
+ "retiring tag %d\n", tag);
+ atomic_set(&port->commands[tag].active, 0);
+
+ if (port->commands[tag].comp_func)
+ port->commands[tag].comp_func(
+ port,
+ tag,
+ port->commands[tag].comp_data,
+ PORT_IRQ_TF_ERR);
+ else
+ dev_warn(&port->dd->pdev->dev,
+ "Bad completion for tag %d\n",
+ tag);
+ }
+ }
+ print_tags(dd, "TFE tags reissued:", tagaccum);
+
+ /* clear eh_active */
+ clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags);
+ wake_up_interruptible(&port->svc_wait);
+
+ mod_timer(&port->cmd_timer,
+ jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
+}
+
+/*
+ * Handle a set device bits interrupt
+ */
+static inline void mtip_process_sdbf(struct driver_data *dd)
+{
+ struct mtip_port *port = dd->port;
+ int group, tag, bit;
+ u32 completed;
+ struct mtip_cmd *command;
+
+ /* walk all bits in all slot groups */
+ for (group = 0; group < dd->slot_groups; group++) {
+ completed = readl(port->completed[group]);
+
+ /* clear completed status register in the hardware.*/
+ writel(completed, port->completed[group]);
+
+ /* Process completed commands. */
+ for (bit = 0;
+ (bit < 32) && completed;
+ bit++, completed >>= 1) {
+ if (completed & 0x01) {
+ tag = (group << 5) | bit;
+
+ /* skip internal command slot. */
+ if (unlikely(tag == MTIP_TAG_INTERNAL))
+ continue;
+
+ command = &port->commands[tag];
+ /* make internal callback */
+ if (likely(command->comp_func)) {
+ command->comp_func(
+ port,
+ tag,
+ command->comp_data,
+ 0);
+ } else {
+ dev_warn(&dd->pdev->dev,
+ "Null completion "
+ "for tag %d",
+ tag);
+
+ if (mtip_check_surprise_removal(
+ dd->pdev)) {
+ mtip_command_cleanup(dd);
+ return;
+ }
+ }
+ }
+ }
+ }
+}
+
+/*
+ * Process legacy pio and d2h interrupts
+ */
+static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
+{
+ struct mtip_port *port = dd->port;
+ struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];
+
+ if (test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) &&
+ (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
+ & (1 << MTIP_TAG_INTERNAL))) {
+ if (cmd->comp_func) {
+ cmd->comp_func(port,
+ MTIP_TAG_INTERNAL,
+ cmd->comp_data,
+ 0);
+ return;
+ }
+ }
+
+ dev_warn(&dd->pdev->dev, "IRQ status 0x%x ignored.\n", port_stat);
+
+ return;
+}
+
+/*
+ * Demux and handle errors
+ */
+static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
+{
+ if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
+ mtip_handle_tfe(dd);
+
+ if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
+ dev_warn(&dd->pdev->dev,
+ "Clearing PxSERR.DIAG.x\n");
+ writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
+ }
+
+ if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
+ dev_warn(&dd->pdev->dev,
+ "Clearing PxSERR.DIAG.n\n");
+ writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
+ }
+
+ if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
+ dev_warn(&dd->pdev->dev,
+ "Port stat errors %x unhandled\n",
+ (port_stat & ~PORT_IRQ_HANDLED));
+ }
+}
+
+static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
+{
+ struct driver_data *dd = (struct driver_data *) data;
+ struct mtip_port *port = dd->port;
+ u32 hba_stat, port_stat;
+ int rv = IRQ_NONE;
+
+ hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
+ if (hba_stat) {
+ rv = IRQ_HANDLED;
+
+ /* Acknowledge the interrupt status on the port.*/
+ port_stat = readl(port->mmio + PORT_IRQ_STAT);
+ writel(port_stat, port->mmio + PORT_IRQ_STAT);
+
+ /* Demux port status */
+ if (likely(port_stat & PORT_IRQ_SDB_FIS))
+ mtip_process_sdbf(dd);
+
+ if (unlikely(port_stat & PORT_IRQ_ERR)) {
+ if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
+ mtip_command_cleanup(dd);
+ /* don't proceed further */
+ return IRQ_HANDLED;
+ }
+
+ mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
+ }
+
+ if (unlikely(port_stat & PORT_IRQ_LEGACY))
+ mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
+ }
+
+ /* acknowledge interrupt */
+ writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
+
+ return rv;
+}
+
+/*
+ * Wrapper for mtip_handle_irq
+ * (ignores return code)
+ */
+static void mtip_tasklet(unsigned long data)
+{
+ mtip_handle_irq((struct driver_data *) data);
+}
+
+/*
+ * HBA interrupt subroutine.
+ *
+ * @irq IRQ number.
+ * @instance Pointer to the driver data structure.
+ *
+ * return value
+ * IRQ_HANDLED A HBA interrupt was pending and handled.
+ * IRQ_NONE This interrupt was not for the HBA.
+ */
+static irqreturn_t mtip_irq_handler(int irq, void *instance)
+{
+ struct driver_data *dd = instance;
+ tasklet_schedule(&dd->tasklet);
+ return IRQ_HANDLED;
+}
+
+static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
+{
+ atomic_set(&port->commands[tag].active, 1);
+ writel(1 << MTIP_TAG_BIT(tag),
+ port->cmd_issue[MTIP_TAG_INDEX(tag)]);
+}
+
+/*
+ * Wait for port to quiesce
+ *
+ * @port Pointer to port data structure
+ * @timeout Max duration to wait (ms)
+ *
+ * return value
+ * 0 Success
+ * -EBUSY Commands still active
+ */
+static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
+{
+ unsigned long to;
+ unsigned int n;
+ unsigned int active = 1;
+
+ to = jiffies + msecs_to_jiffies(timeout);
+ do {
+ if (test_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags) &&
+ test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) {
+ msleep(20);
+ continue; /* svc thd is actively issuing commands */
+ }
+ /*
+ * Ignore s_active bit 0 of array element 0.
+ * This bit will always be set
+ */
+ active = readl(port->s_active[0]) & 0xFFFFFFFE;
+ for (n = 1; n < port->dd->slot_groups; n++)
+ active |= readl(port->s_active[n]);
+
+ if (!active)
+ break;
+
+ msleep(20);
+ } while (time_before(jiffies, to));
+
+ return active ? -EBUSY : 0;
+}
+
+/*
+ * Execute an internal command and wait for the completion.
+ *
+ * @port Pointer to the port data structure.
+ * @fis Pointer to the FIS that describes the command.
+ * @fis_len Length in WORDS of the FIS.
+ * @buffer DMA accessible for command data.
+ * @buf_len Length, in bytes, of the data buffer.
+ * @opts Command header options, excluding the FIS length
+ * and the number of PRD entries.
+ * @timeout Time in ms to wait for the command to complete.
+ *
+ * return value
+ * 0 Command completed successfully.
+ * -EFAULT The buffer address is not correctly aligned.
+ * -EBUSY Internal command or other IO in progress.
+ * -EAGAIN Time out waiting for command to complete.
+ */
+static int mtip_exec_internal_command(struct mtip_port *port,
+ void *fis,
+ int fis_len,
+ dma_addr_t buffer,
+ int buf_len,
+ u32 opts,
+ gfp_t atomic,
+ unsigned long timeout)
+{
+ struct mtip_cmd_sg *command_sg;
+ DECLARE_COMPLETION_ONSTACK(wait);
+ int rv = 0;
+ struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
+
+ /* Make sure the buffer is 8 byte aligned. This is asic specific. */
+ if (buffer & 0x00000007) {
+ dev_err(&port->dd->pdev->dev,
+ "SG buffer is not 8 byte aligned\n");
+ return -EFAULT;
+ }
+
+ /* Only one internal command should be running at a time */
+ if (test_and_set_bit(MTIP_TAG_INTERNAL, port->allocated)) {
+ dev_warn(&port->dd->pdev->dev,
+ "Internal command already active\n");
+ return -EBUSY;
+ }
+ set_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
+
+ if (atomic == GFP_KERNEL) {
+ /* wait for io to complete if non atomic */
+ if (mtip_quiesce_io(port, 5000) < 0) {
+ dev_warn(&port->dd->pdev->dev,
+ "Failed to quiesce IO\n");
+ release_slot(port, MTIP_TAG_INTERNAL);
+ clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
+ wake_up_interruptible(&port->svc_wait);
+ return -EBUSY;
+ }
+
+ /* Set the completion function and data for the command. */
+ int_cmd->comp_data = &wait;
+ int_cmd->comp_func = mtip_completion;
+
+ } else {
+ /* Clear completion - we're going to poll */
+ int_cmd->comp_data = NULL;
+ int_cmd->comp_func = NULL;
+ }
+
+ /* Copy the command to the command table */
+ memcpy(int_cmd->command, fis, fis_len*4);
+
+ /* Populate the SG list */
+ int_cmd->command_header->opts =
+ __force_bit2int cpu_to_le32(opts | fis_len);
+ if (buf_len) {
+ command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
+
+ command_sg->info =
+ __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
+ command_sg->dba =
+ __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
+ command_sg->dba_upper =
+ __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
+
+ int_cmd->command_header->opts |=
+ __force_bit2int cpu_to_le32((1 << 16));
+ }
+
+ /* Populate the command header */
+ int_cmd->command_header->byte_count = 0;
+
+ /* Issue the command to the hardware */
+ mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
+
+ /* Poll if atomic, wait_for_completion otherwise */
+ if (atomic == GFP_KERNEL) {
+ /* Wait for the command to complete or timeout. */
+ if (wait_for_completion_timeout(
+ &wait,
+ msecs_to_jiffies(timeout)) == 0) {
+ dev_err(&port->dd->pdev->dev,
+ "Internal command did not complete [%d] "
+ "within timeout of %lu ms\n",
+ atomic, timeout);
+ rv = -EAGAIN;
+ }
+
+ if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
+ & (1 << MTIP_TAG_INTERNAL)) {
+ dev_warn(&port->dd->pdev->dev,
+ "Retiring internal command but CI is 1.\n");
+ }
+
+ } else {
+ /* Spin for <timeout> checking if command still outstanding */
+ timeout = jiffies + msecs_to_jiffies(timeout);
+
+ while ((readl(
+ port->cmd_issue[MTIP_TAG_INTERNAL])
+ & (1 << MTIP_TAG_INTERNAL))
+ && time_before(jiffies, timeout))
+ ;
+
+ if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
+ & (1 << MTIP_TAG_INTERNAL)) {
+ dev_err(&port->dd->pdev->dev,
+ "Internal command did not complete [%d]\n",
+ atomic);
+ rv = -EAGAIN;
+ }
+ }
+
+ /* Clear the allocated and active bits for the internal command. */
+ atomic_set(&int_cmd->active, 0);
+ release_slot(port, MTIP_TAG_INTERNAL);
+ clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags);
+ wake_up_interruptible(&port->svc_wait);
+
+ return rv;
+}
+
+/*
+ * Byte-swap ATA ID strings.
+ *
+ * ATA identify data contains strings in byte-swapped 16-bit words.
+ * They must be swapped (on all architectures) to be usable as C strings.
+ * This function swaps bytes in-place.
+ *
+ * @buf The buffer location of the string
+ * @len The number of bytes to swap
+ *
+ * return value
+ * None
+ */
+static inline void ata_swap_string(u16 *buf, unsigned int len)
+{
+ int i;
+ for (i = 0; i < (len/2); i++)
+ be16_to_cpus(&buf[i]);
+}
+
+/*
+ * Request the device identity information.
+ *
+ * If a user space buffer is not specified, i.e. is NULL, the
+ * identify information is still read from the drive and placed
+ * into the identify data buffer (@e port->identify) in the
+ * port data structure.
+ * When the identify buffer contains valid identify information @e
+ * port->identify_valid is non-zero.
+ *
+ * @port Pointer to the port structure.
+ * @user_buffer A user space buffer where the identify data should be
+ * copied.
+ *
+ * return value
+ * 0 Command completed successfully.
+ * -EFAULT An error occurred while coping data to the user buffer.
+ * -1 Command failed.
+ */
+static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
+{
+ int rv = 0;
+ struct host_to_dev_fis fis;
+
+ /* Build the FIS. */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = ATA_CMD_ID_ATA;
+
+ /* Set the identify information as invalid. */
+ port->identify_valid = 0;
+
+ /* Clear the identify information. */
+ memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
+
+ /* Execute the command. */
+ if (mtip_exec_internal_command(port,
+ &fis,
+ 5,
+ port->identify_dma,
+ sizeof(u16) * ATA_ID_WORDS,
+ 0,
+ GFP_KERNEL,
+ MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
+ < 0) {
+ rv = -1;
+ goto out;
+ }
+
+ /*
+ * Perform any necessary byte-swapping. Yes, the kernel does in fact
+ * perform field-sensitive swapping on the string fields.
+ * See the kernel use of ata_id_string() for proof of this.
+ */
+#ifdef __LITTLE_ENDIAN
+ ata_swap_string(port->identify + 27, 40); /* model string*/
+ ata_swap_string(port->identify + 23, 8); /* firmware string*/
+ ata_swap_string(port->identify + 10, 20); /* serial# string*/
+#else
+ {
+ int i;
+ for (i = 0; i < ATA_ID_WORDS; i++)
+ port->identify[i] = le16_to_cpu(port->identify[i]);
+ }
+#endif
+
+ /* Set the identify buffer as valid. */
+ port->identify_valid = 1;
+
+ if (user_buffer) {
+ if (copy_to_user(
+ user_buffer,
+ port->identify,
+ ATA_ID_WORDS * sizeof(u16))) {
+ rv = -EFAULT;
+ goto out;
+ }
+ }
+
+out:
+ return rv;
+}
+
+/*
+ * Issue a standby immediate command to the device.
+ *
+ * @port Pointer to the port structure.
+ *
+ * return value
+ * 0 Command was executed successfully.
+ * -1 An error occurred while executing the command.
+ */
+static int mtip_standby_immediate(struct mtip_port *port)
+{
+ int rv;
+ struct host_to_dev_fis fis;
+
+ /* Build the FIS. */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = ATA_CMD_STANDBYNOW1;
+
+ /* Execute the command. Use a 15-second timeout for large drives. */
+ rv = mtip_exec_internal_command(port,
+ &fis,
+ 5,
+ 0,
+ 0,
+ 0,
+ GFP_KERNEL,
+ 15000);
+
+ return rv;
+}
+
+/*
+ * Get the drive capacity.
+ *
+ * @dd Pointer to the device data structure.
+ * @sectors Pointer to the variable that will receive the sector count.
+ *
+ * return value
+ * 1 Capacity was returned successfully.
+ * 0 The identify information is invalid.
+ */
+static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
+{
+ struct mtip_port *port = dd->port;
+ u64 total, raw0, raw1, raw2, raw3;
+ raw0 = port->identify[100];
+ raw1 = port->identify[101];
+ raw2 = port->identify[102];
+ raw3 = port->identify[103];
+ total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
+ *sectors = total;
+ return (bool) !!port->identify_valid;
+}
+
+/*
+ * Reset the HBA.
+ *
+ * Resets the HBA by setting the HBA Reset bit in the Global
+ * HBA Control register. After setting the HBA Reset bit the
+ * function waits for 1 second before reading the HBA Reset
+ * bit to make sure it has cleared. If HBA Reset is not clear
+ * an error is returned. Cannot be used in non-blockable
+ * context.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 The reset was successful.
+ * -1 The HBA Reset bit did not clear.
+ */
+static int mtip_hba_reset(struct driver_data *dd)
+{
+ mtip_deinit_port(dd->port);
+
+ /* Set the reset bit */
+ writel(HOST_RESET, dd->mmio + HOST_CTL);
+
+ /* Flush */
+ readl(dd->mmio + HOST_CTL);
+
+ /* Wait for reset to clear */
+ ssleep(1);
+
+ /* Check the bit has cleared */
+ if (readl(dd->mmio + HOST_CTL) & HOST_RESET) {
+ dev_err(&dd->pdev->dev,
+ "Reset bit did not clear.\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Display the identify command data.
+ *
+ * @port Pointer to the port data structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_dump_identify(struct mtip_port *port)
+{
+ sector_t sectors;
+ unsigned short revid;
+ char cbuf[42];
+
+ if (!port->identify_valid)
+ return;
+
+ strlcpy(cbuf, (char *)(port->identify+10), 21);
+ dev_info(&port->dd->pdev->dev,
+ "Serial No.: %s\n", cbuf);
+
+ strlcpy(cbuf, (char *)(port->identify+23), 9);
+ dev_info(&port->dd->pdev->dev,
+ "Firmware Ver.: %s\n", cbuf);
+
+ strlcpy(cbuf, (char *)(port->identify+27), 41);
+ dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
+
+ if (mtip_hw_get_capacity(port->dd, &sectors))
+ dev_info(&port->dd->pdev->dev,
+ "Capacity: %llu sectors (%llu MB)\n",
+ (u64)sectors,
+ ((u64)sectors) * ATA_SECT_SIZE >> 20);
+
+ pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
+ switch (revid & 0xFF) {
+ case 0x1:
+ strlcpy(cbuf, "A0", 3);
+ break;
+ case 0x3:
+ strlcpy(cbuf, "A2", 3);
+ break;
+ default:
+ strlcpy(cbuf, "?", 2);
+ break;
+ }
+ dev_info(&port->dd->pdev->dev,
+ "Card Type: %s\n", cbuf);
+}
+
+/*
+ * Map the commands scatter list into the command table.
+ *
+ * @command Pointer to the command.
+ * @nents Number of scatter list entries.
+ *
+ * return value
+ * None
+ */
+static inline void fill_command_sg(struct driver_data *dd,
+ struct mtip_cmd *command,
+ int nents)
+{
+ int n;
+ unsigned int dma_len;
+ struct mtip_cmd_sg *command_sg;
+ struct scatterlist *sg = command->sg;
+
+ command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
+
+ for (n = 0; n < nents; n++) {
+ dma_len = sg_dma_len(sg);
+ if (dma_len > 0x400000)
+ dev_err(&dd->pdev->dev,
+ "DMA segment length truncated\n");
+ command_sg->info = __force_bit2int
+ cpu_to_le32((dma_len-1) & 0x3FFFFF);
+ command_sg->dba = __force_bit2int
+ cpu_to_le32(sg_dma_address(sg));
+ command_sg->dba_upper = __force_bit2int
+ cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
+ command_sg++;
+ sg++;
+ }
+}
+
+/*
+ * @brief Execute a drive command.
+ *
+ * return value 0 The command completed successfully.
+ * return value -1 An error occurred while executing the command.
+ */
+static int exec_drive_task(struct mtip_port *port, u8 *command)
+{
+ struct host_to_dev_fis fis;
+ struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
+
+ /* Build the FIS. */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = command[0];
+ fis.features = command[1];
+ fis.sect_count = command[2];
+ fis.sector = command[3];
+ fis.cyl_low = command[4];
+ fis.cyl_hi = command[5];
+ fis.device = command[6] & ~0x10; /* Clear the dev bit*/
+
+
+ dbg_printk(MTIP_DRV_NAME "%s: User Command: cmd %x, feat %x, "
+ "nsect %x, sect %x, lcyl %x, "
+ "hcyl %x, sel %x\n",
+ __func__,
+ command[0],
+ command[1],
+ command[2],
+ command[3],
+ command[4],
+ command[5],
+ command[6]);
+
+ /* Execute the command. */
+ if (mtip_exec_internal_command(port,
+ &fis,
+ 5,
+ 0,
+ 0,
+ 0,
+ GFP_KERNEL,
+ MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
+ return -1;
+ }
+
+ command[0] = reply->command; /* Status*/
+ command[1] = reply->features; /* Error*/
+ command[4] = reply->cyl_low;
+ command[5] = reply->cyl_hi;
+
+ dbg_printk(MTIP_DRV_NAME "%s: Completion Status: stat %x, "
+ "err %x , cyl_lo %x cyl_hi %x\n",
+ __func__,
+ command[0],
+ command[1],
+ command[4],
+ command[5]);
+
+ return 0;
+}
+
+/*
+ * @brief Execute a drive command.
+ *
+ * @param port Pointer to the port data structure.
+ * @param command Pointer to the user specified command parameters.
+ * @param user_buffer Pointer to the user space buffer where read sector
+ * data should be copied.
+ *
+ * return value 0 The command completed successfully.
+ * return value -EFAULT An error occurred while copying the completion
+ * data to the user space buffer.
+ * return value -1 An error occurred while executing the command.
+ */
+static int exec_drive_command(struct mtip_port *port, u8 *command,
+ void __user *user_buffer)
+{
+ struct host_to_dev_fis fis;
+ struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
+
+ /* Build the FIS. */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = command[0];
+ fis.features = command[2];
+ fis.sect_count = command[3];
+ if (fis.command == ATA_CMD_SMART) {
+ fis.sector = command[1];
+ fis.cyl_low = 0x4F;
+ fis.cyl_hi = 0xC2;
+ }
+
+ dbg_printk(MTIP_DRV_NAME
+ "%s: User Command: cmd %x, sect %x, "
+ "feat %x, sectcnt %x\n",
+ __func__,
+ command[0],
+ command[1],
+ command[2],
+ command[3]);
+
+ memset(port->sector_buffer, 0x00, ATA_SECT_SIZE);
+
+ /* Execute the command. */
+ if (mtip_exec_internal_command(port,
+ &fis,
+ 5,
+ port->sector_buffer_dma,
+ (command[3] != 0) ? ATA_SECT_SIZE : 0,
+ 0,
+ GFP_KERNEL,
+ MTIP_IOCTL_COMMAND_TIMEOUT_MS)
+ < 0) {
+ return -1;
+ }
+
+ /* Collect the completion status. */
+ command[0] = reply->command; /* Status*/
+ command[1] = reply->features; /* Error*/
+ command[2] = command[3];
+
+ dbg_printk(MTIP_DRV_NAME
+ "%s: Completion Status: stat %x, "
+ "err %x, cmd %x\n",
+ __func__,
+ command[0],
+ command[1],
+ command[2]);
+
+ if (user_buffer && command[3]) {
+ if (copy_to_user(user_buffer,
+ port->sector_buffer,
+ ATA_SECT_SIZE * command[3])) {
+ return -EFAULT;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Indicates whether a command has a single sector payload.
+ *
+ * @command passed to the device to perform the certain event.
+ * @features passed to the device to perform the certain event.
+ *
+ * return value
+ * 1 command is one that always has a single sector payload,
+ * regardless of the value in the Sector Count field.
+ * 0 otherwise
+ *
+ */
+static unsigned int implicit_sector(unsigned char command,
+ unsigned char features)
+{
+ unsigned int rv = 0;
+
+ /* list of commands that have an implicit sector count of 1 */
+ switch (command) {
+ case ATA_CMD_SEC_SET_PASS:
+ case ATA_CMD_SEC_UNLOCK:
+ case ATA_CMD_SEC_ERASE_PREP:
+ case ATA_CMD_SEC_ERASE_UNIT:
+ case ATA_CMD_SEC_FREEZE_LOCK:
+ case ATA_CMD_SEC_DISABLE_PASS:
+ case ATA_CMD_PMP_READ:
+ case ATA_CMD_PMP_WRITE:
+ rv = 1;
+ break;
+ case ATA_CMD_SET_MAX:
+ if (features == ATA_SET_MAX_UNLOCK)
+ rv = 1;
+ break;
+ case ATA_CMD_SMART:
+ if ((features == ATA_SMART_READ_VALUES) ||
+ (features == ATA_SMART_READ_THRESHOLDS))
+ rv = 1;
+ break;
+ case ATA_CMD_CONF_OVERLAY:
+ if ((features == ATA_DCO_IDENTIFY) ||
+ (features == ATA_DCO_SET))
+ rv = 1;
+ break;
+ }
+ return rv;
+}
+
+/*
+ * Executes a taskfile
+ * See ide_taskfile_ioctl() for derivation
+ */
+static int exec_drive_taskfile(struct driver_data *dd,
+ void __user *buf,
+ ide_task_request_t *req_task,
+ int outtotal)
+{
+ struct host_to_dev_fis fis;
+ struct host_to_dev_fis *reply;
+ u8 *outbuf = NULL;
+ u8 *inbuf = NULL;
+ dma_addr_t outbuf_dma = 0;
+ dma_addr_t inbuf_dma = 0;
+ dma_addr_t dma_buffer = 0;
+ int err = 0;
+ unsigned int taskin = 0;
+ unsigned int taskout = 0;
+ u8 nsect = 0;
+ unsigned int timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
+ unsigned int force_single_sector;
+ unsigned int transfer_size;
+ unsigned long task_file_data;
+ int intotal = outtotal + req_task->out_size;
+
+ taskout = req_task->out_size;
+ taskin = req_task->in_size;
+ /* 130560 = 512 * 0xFF*/
+ if (taskin > 130560 || taskout > 130560) {
+ err = -EINVAL;
+ goto abort;
+ }
+
+ if (taskout) {
+ outbuf = kzalloc(taskout, GFP_KERNEL);
+ if (outbuf == NULL) {
+ err = -ENOMEM;
+ goto abort;
+ }
+ if (copy_from_user(outbuf, buf + outtotal, taskout)) {
+ err = -EFAULT;
+ goto abort;
+ }
+ outbuf_dma = pci_map_single(dd->pdev,
+ outbuf,
+ taskout,
+ DMA_TO_DEVICE);
+ if (outbuf_dma == 0) {
+ err = -ENOMEM;
+ goto abort;
+ }
+ dma_buffer = outbuf_dma;
+ }
+
+ if (taskin) {
+ inbuf = kzalloc(taskin, GFP_KERNEL);
+ if (inbuf == NULL) {
+ err = -ENOMEM;
+ goto abort;
+ }
+
+ if (copy_from_user(inbuf, buf + intotal, taskin)) {
+ err = -EFAULT;
+ goto abort;
+ }
+ inbuf_dma = pci_map_single(dd->pdev,
+ inbuf,
+ taskin, DMA_FROM_DEVICE);
+ if (inbuf_dma == 0) {
+ err = -ENOMEM;
+ goto abort;
+ }
+ dma_buffer = inbuf_dma;
+ }
+
+ /* only supports PIO and non-data commands from this ioctl. */
+ switch (req_task->data_phase) {
+ case TASKFILE_OUT:
+ nsect = taskout / ATA_SECT_SIZE;
+ reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
+ break;
+ case TASKFILE_IN:
+ reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
+ break;
+ case TASKFILE_NO_DATA:
+ reply = (dd->port->rxfis + RX_FIS_D2H_REG);
+ break;
+ default:
+ err = -EINVAL;
+ goto abort;
+ }
+
+ /* Build the FIS. */
+ memset(&fis, 0, sizeof(struct host_to_dev_fis));
+
+ fis.type = 0x27;
+ fis.opts = 1 << 7;
+ fis.command = req_task->io_ports[7];
+ fis.features = req_task->io_ports[1];
+ fis.sect_count = req_task->io_ports[2];
+ fis.lba_low = req_task->io_ports[3];
+ fis.lba_mid = req_task->io_ports[4];
+ fis.lba_hi = req_task->io_ports[5];
+ /* Clear the dev bit*/
+ fis.device = req_task->io_ports[6] & ~0x10;
+
+ if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
+ req_task->in_flags.all =
+ IDE_TASKFILE_STD_IN_FLAGS |
+ (IDE_HOB_STD_IN_FLAGS << 8);
+ fis.lba_low_ex = req_task->hob_ports[3];
+ fis.lba_mid_ex = req_task->hob_ports[4];
+ fis.lba_hi_ex = req_task->hob_ports[5];
+ fis.features_ex = req_task->hob_ports[1];
+ fis.sect_cnt_ex = req_task->hob_ports[2];
+
+ } else {
+ req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
+ }
+
+ force_single_sector = implicit_sector(fis.command, fis.features);
+
+ if ((taskin || taskout) && (!fis.sect_count)) {
+ if (nsect)
+ fis.sect_count = nsect;
+ else {
+ if (!force_single_sector) {
+ dev_warn(&dd->pdev->dev,
+ "data movement but "
+ "sect_count is 0\n");
+ err = -EINVAL;
+ goto abort;
+ }
+ }
+ }
+
+ dbg_printk(MTIP_DRV_NAME
+ "taskfile: cmd %x, feat %x, nsect %x,"
+ " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
+ " head/dev %x\n",
+ fis.command,
+ fis.features,
+ fis.sect_count,
+ fis.lba_low,
+ fis.lba_mid,
+ fis.lba_hi,
+ fis.device);
+
+ switch (fis.command) {
+ case ATA_CMD_DOWNLOAD_MICRO:
+ /* Change timeout for Download Microcode to 60 seconds.*/
+ timeout = 60000;
+ break;
+ case ATA_CMD_SEC_ERASE_UNIT:
+ /* Change timeout for Security Erase Unit to 4 minutes.*/
+ timeout = 240000;
+ break;
+ case ATA_CMD_STANDBYNOW1:
+ /* Change timeout for standby immediate to 10 seconds.*/
+ timeout = 10000;
+ break;
+ case 0xF7:
+ case 0xFA:
+ /* Change timeout for vendor unique command to 10 secs */
+ timeout = 10000;
+ break;
+ case ATA_CMD_SMART:
+ /* Change timeout for vendor unique command to 10 secs */
+ timeout = 10000;
+ break;
+ default:
+ timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
+ break;
+ }
+
+ /* Determine the correct transfer size.*/
+ if (force_single_sector)
+ transfer_size = ATA_SECT_SIZE;
+ else
+ transfer_size = ATA_SECT_SIZE * fis.sect_count;
+
+ /* Execute the command.*/
+ if (mtip_exec_internal_command(dd->port,
+ &fis,
+ 5,
+ dma_buffer,
+ transfer_size,
+ 0,
+ GFP_KERNEL,
+ timeout) < 0) {
+ err = -EIO;
+ goto abort;
+ }
+
+ task_file_data = readl(dd->port->mmio+PORT_TFDATA);
+
+ if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
+ reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
+ req_task->io_ports[7] = reply->control;
+ } else {
+ reply = dd->port->rxfis + RX_FIS_D2H_REG;
+ req_task->io_ports[7] = reply->command;
+ }
+
+ /* reclaim the DMA buffers.*/
+ if (inbuf_dma)
+ pci_unmap_single(dd->pdev, inbuf_dma,
+ taskin, DMA_FROM_DEVICE);
+ if (outbuf_dma)
+ pci_unmap_single(dd->pdev, outbuf_dma,
+ taskout, DMA_TO_DEVICE);
+ inbuf_dma = 0;
+ outbuf_dma = 0;
+
+ /* return the ATA registers to the caller.*/
+ req_task->io_ports[1] = reply->features;
+ req_task->io_ports[2] = reply->sect_count;
+ req_task->io_ports[3] = reply->lba_low;
+ req_task->io_ports[4] = reply->lba_mid;
+ req_task->io_ports[5] = reply->lba_hi;
+ req_task->io_ports[6] = reply->device;
+
+ if (req_task->out_flags.all & 1) {
+
+ req_task->hob_ports[3] = reply->lba_low_ex;
+ req_task->hob_ports[4] = reply->lba_mid_ex;
+ req_task->hob_ports[5] = reply->lba_hi_ex;
+ req_task->hob_ports[1] = reply->features_ex;
+ req_task->hob_ports[2] = reply->sect_cnt_ex;
+ }
+
+ /* Com rest after secure erase or lowlevel format */
+ if (((fis.command == ATA_CMD_SEC_ERASE_UNIT) ||
+ ((fis.command == 0xFC) &&
+ (fis.features == 0x27 || fis.features == 0x72 ||
+ fis.features == 0x62 || fis.features == 0x26))) &&
+ !(reply->command & 1)) {
+ mtip_restart_port(dd->port);
+ }
+
+ dbg_printk(MTIP_DRV_NAME
+ "%s: Completion: stat %x,"
+ "err %x, sect_cnt %x, lbalo %x,"
+ "lbamid %x, lbahi %x, dev %x\n",
+ __func__,
+ req_task->io_ports[7],
+ req_task->io_ports[1],
+ req_task->io_ports[2],
+ req_task->io_ports[3],
+ req_task->io_ports[4],
+ req_task->io_ports[5],
+ req_task->io_ports[6]);
+
+ if (taskout) {
+ if (copy_to_user(buf + outtotal, outbuf, taskout)) {
+ err = -EFAULT;
+ goto abort;
+ }
+ }
+ if (taskin) {
+ if (copy_to_user(buf + intotal, inbuf, taskin)) {
+ err = -EFAULT;
+ goto abort;
+ }
+ }
+abort:
+ if (inbuf_dma)
+ pci_unmap_single(dd->pdev, inbuf_dma,
+ taskin, DMA_FROM_DEVICE);
+ if (outbuf_dma)
+ pci_unmap_single(dd->pdev, outbuf_dma,
+ taskout, DMA_TO_DEVICE);
+ kfree(outbuf);
+ kfree(inbuf);
+
+ return err;
+}
+
+/*
+ * Handle IOCTL calls from the Block Layer.
+ *
+ * This function is called by the Block Layer when it receives an IOCTL
+ * command that it does not understand. If the IOCTL command is not supported
+ * this function returns -ENOTTY.
+ *
+ * @dd Pointer to the driver data structure.
+ * @cmd IOCTL command passed from the Block Layer.
+ * @arg IOCTL argument passed from the Block Layer.
+ *
+ * return value
+ * 0 The IOCTL completed successfully.
+ * -ENOTTY The specified command is not supported.
+ * -EFAULT An error occurred copying data to a user space buffer.
+ * -EIO An error occurred while executing the command.
+ */
+static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case HDIO_GET_IDENTITY:
+ if (mtip_get_identify(dd->port, (void __user *) arg) < 0) {
+ dev_warn(&dd->pdev->dev,
+ "Unable to read identity\n");
+ return -EIO;
+ }
+
+ break;
+ case HDIO_DRIVE_CMD:
+ {
+ u8 drive_command[4];
+
+ /* Copy the user command info to our buffer. */
+ if (copy_from_user(drive_command,
+ (void __user *) arg,
+ sizeof(drive_command)))
+ return -EFAULT;
+
+ /* Execute the drive command. */
+ if (exec_drive_command(dd->port,
+ drive_command,
+ (void __user *) (arg+4)))
+ return -EIO;
+
+ /* Copy the status back to the users buffer. */
+ if (copy_to_user((void __user *) arg,
+ drive_command,
+ sizeof(drive_command)))
+ return -EFAULT;
+
+ break;
+ }
+ case HDIO_DRIVE_TASK:
+ {
+ u8 drive_command[7];
+
+ /* Copy the user command info to our buffer. */
+ if (copy_from_user(drive_command,
+ (void __user *) arg,
+ sizeof(drive_command)))
+ return -EFAULT;
+
+ /* Execute the drive command. */
+ if (exec_drive_task(dd->port, drive_command))
+ return -EIO;
+
+ /* Copy the status back to the users buffer. */
+ if (copy_to_user((void __user *) arg,
+ drive_command,
+ sizeof(drive_command)))
+ return -EFAULT;
+
+ break;
+ }
+ case HDIO_DRIVE_TASKFILE: {
+ ide_task_request_t req_task;
+ int ret, outtotal;
+
+ if (copy_from_user(&req_task, (void __user *) arg,
+ sizeof(req_task)))
+ return -EFAULT;
+
+ outtotal = sizeof(req_task);
+
+ ret = exec_drive_taskfile(dd, (void __user *) arg,
+ &req_task, outtotal);
+
+ if (copy_to_user((void __user *) arg, &req_task,
+ sizeof(req_task)))
+ return -EFAULT;
+
+ return ret;
+ }
+
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * Submit an IO to the hw
+ *
+ * This function is called by the block layer to issue an io
+ * to the device. Upon completion, the callback function will
+ * be called with the data parameter passed as the callback data.
+ *
+ * @dd Pointer to the driver data structure.
+ * @start First sector to read.
+ * @nsect Number of sectors to read.
+ * @nents Number of entries in scatter list for the read command.
+ * @tag The tag of this read command.
+ * @callback Pointer to the function that should be called
+ * when the read completes.
+ * @data Callback data passed to the callback function
+ * when the read completes.
+ * @barrier If non-zero, this command must be completed before
+ * issuing any other commands.
+ * @dir Direction (read or write)
+ *
+ * return value
+ * None
+ */
+static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
+ int nsect, int nents, int tag, void *callback,
+ void *data, int barrier, int dir)
+{
+ struct host_to_dev_fis *fis;
+ struct mtip_port *port = dd->port;
+ struct mtip_cmd *command = &port->commands[tag];
+
+ /* Map the scatter list for DMA access */
+ if (dir == READ)
+ nents = dma_map_sg(&dd->pdev->dev, command->sg,
+ nents, DMA_FROM_DEVICE);
+ else
+ nents = dma_map_sg(&dd->pdev->dev, command->sg,
+ nents, DMA_TO_DEVICE);
+
+ command->scatter_ents = nents;
+
+ /*
+ * The number of retries for this command before it is
+ * reported as a failure to the upper layers.
+ */
+ command->retries = MTIP_MAX_RETRIES;
+
+ /* Fill out fis */
+ fis = command->command;
+ fis->type = 0x27;
+ fis->opts = 1 << 7;
+ fis->command =
+ (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
+ *((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
+ *((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
+ fis->device = 1 << 6;
+ if (barrier)
+ fis->device |= FUA_BIT;
+ fis->features = nsect & 0xFF;
+ fis->features_ex = (nsect >> 8) & 0xFF;
+ fis->sect_count = ((tag << 3) | (tag >> 5));
+ fis->sect_cnt_ex = 0;
+ fis->control = 0;
+ fis->res2 = 0;
+ fis->res3 = 0;
+ fill_command_sg(dd, command, nents);
+
+ /* Populate the command header */
+ command->command_header->opts =
+ __force_bit2int cpu_to_le32(
+ (nents << 16) | 5 | AHCI_CMD_PREFETCH);
+ command->command_header->byte_count = 0;
+
+ /*
+ * Set the completion function and data for the command
+ * within this layer.
+ */
+ command->comp_data = dd;
+ command->comp_func = mtip_async_complete;
+ command->direction = (dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+
+ /*
+ * Set the completion function and data for the command passed
+ * from the upper layer.
+ */
+ command->async_data = data;
+ command->async_callback = callback;
+
+ /*
+ * To prevent this command from being issued
+ * if an internal command is in progress or error handling is active.
+ */
+ if (unlikely(test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) ||
+ test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags))) {
+ set_bit(tag, port->cmds_to_issue);
+ set_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
+ return;
+ }
+
+ /* Issue the command to the hardware */
+ mtip_issue_ncq_command(port, tag);
+
+ /* Set the command's timeout value.*/
+ port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
+ MTIP_NCQ_COMMAND_TIMEOUT_MS);
+}
+
+/*
+ * Release a command slot.
+ *
+ * @dd Pointer to the driver data structure.
+ * @tag Slot tag
+ *
+ * return value
+ * None
+ */
+static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
+{
+ release_slot(dd->port, tag);
+}
+
+/*
+ * Obtain a command slot and return its associated scatter list.
+ *
+ * @dd Pointer to the driver data structure.
+ * @tag Pointer to an int that will receive the allocated command
+ * slot tag.
+ *
+ * return value
+ * Pointer to the scatter list for the allocated command slot
+ * or NULL if no command slots are available.
+ */
+static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
+ int *tag)
+{
+ /*
+ * It is possible that, even with this semaphore, a thread
+ * may think that no command slots are available. Therefore, we
+ * need to make an attempt to get_slot().
+ */
+ down(&dd->port->cmd_slot);
+ *tag = get_slot(dd->port);
+
+ if (unlikely(*tag < 0))
+ return NULL;
+
+ return dd->port->commands[*tag].sg;
+}
+
+/*
+ * Sysfs register/status dump.
+ *
+ * @dev Pointer to the device structure, passed by the kernrel.
+ * @attr Pointer to the device_attribute structure passed by the kernel.
+ * @buf Pointer to the char buffer that will receive the stats info.
+ *
+ * return value
+ * The size, in bytes, of the data copied into buf.
+ */
+static ssize_t hw_show_registers(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u32 group_allocated;
+ struct driver_data *dd = dev_to_disk(dev)->private_data;
+ int size = 0;
+ int n;
+
+ size += sprintf(&buf[size], "%s:\ns_active:\n", __func__);
+
+ for (n = 0; n < dd->slot_groups; n++)
+ size += sprintf(&buf[size], "0x%08x\n",
+ readl(dd->port->s_active[n]));
+
+ size += sprintf(&buf[size], "Command Issue:\n");
+
+ for (n = 0; n < dd->slot_groups; n++)
+ size += sprintf(&buf[size], "0x%08x\n",
+ readl(dd->port->cmd_issue[n]));
+
+ size += sprintf(&buf[size], "Allocated:\n");
+
+ for (n = 0; n < dd->slot_groups; n++) {
+ if (sizeof(long) > sizeof(u32))
+ group_allocated =
+ dd->port->allocated[n/2] >> (32*(n&1));
+ else
+ group_allocated = dd->port->allocated[n];
+ size += sprintf(&buf[size], "0x%08x\n",
+ group_allocated);
+ }
+
+ size += sprintf(&buf[size], "completed:\n");
+
+ for (n = 0; n < dd->slot_groups; n++)
+ size += sprintf(&buf[size], "0x%08x\n",
+ readl(dd->port->completed[n]));
+
+ size += sprintf(&buf[size], "PORT_IRQ_STAT 0x%08x\n",
+ readl(dd->port->mmio + PORT_IRQ_STAT));
+ size += sprintf(&buf[size], "HOST_IRQ_STAT 0x%08x\n",
+ readl(dd->mmio + HOST_IRQ_STAT));
+
+ return size;
+}
+static DEVICE_ATTR(registers, S_IRUGO, hw_show_registers, NULL);
+
+/*
+ * Create the sysfs related attributes.
+ *
+ * @dd Pointer to the driver data structure.
+ * @kobj Pointer to the kobj for the block device.
+ *
+ * return value
+ * 0 Operation completed successfully.
+ * -EINVAL Invalid parameter.
+ */
+static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
+{
+ if (!kobj || !dd)
+ return -EINVAL;
+
+ if (sysfs_create_file(kobj, &dev_attr_registers.attr))
+ dev_warn(&dd->pdev->dev,
+ "Error creating registers sysfs entry\n");
+ return 0;
+}
+
+/*
+ * Remove the sysfs related attributes.
+ *
+ * @dd Pointer to the driver data structure.
+ * @kobj Pointer to the kobj for the block device.
+ *
+ * return value
+ * 0 Operation completed successfully.
+ * -EINVAL Invalid parameter.
+ */
+static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
+{
+ if (!kobj || !dd)
+ return -EINVAL;
+
+ sysfs_remove_file(kobj, &dev_attr_registers.attr);
+
+ return 0;
+}
+
+/*
+ * Perform any init/resume time hardware setup
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * None
+ */
+static inline void hba_setup(struct driver_data *dd)
+{
+ u32 hwdata;
+ hwdata = readl(dd->mmio + HOST_HSORG);
+
+ /* interrupt bug workaround: use only 1 IS bit.*/
+ writel(hwdata |
+ HSORG_DISABLE_SLOTGRP_INTR |
+ HSORG_DISABLE_SLOTGRP_PXIS,
+ dd->mmio + HOST_HSORG);
+}
+
+/*
+ * Detect the details of the product, and store anything needed
+ * into the driver data structure. This includes product type and
+ * version and number of slot groups.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * None
+ */
+static void mtip_detect_product(struct driver_data *dd)
+{
+ u32 hwdata;
+ unsigned int rev, slotgroups;
+
+ /*
+ * HBA base + 0xFC [15:0] - vendor-specific hardware interface
+ * info register:
+ * [15:8] hardware/software interface rev#
+ * [ 3] asic-style interface
+ * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
+ */
+ hwdata = readl(dd->mmio + HOST_HSORG);
+
+ dd->product_type = MTIP_PRODUCT_UNKNOWN;
+ dd->slot_groups = 1;
+
+ if (hwdata & 0x8) {
+ dd->product_type = MTIP_PRODUCT_ASICFPGA;
+ rev = (hwdata & HSORG_HWREV) >> 8;
+ slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
+ dev_info(&dd->pdev->dev,
+ "ASIC-FPGA design, HS rev 0x%x, "
+ "%i slot groups [%i slots]\n",
+ rev,
+ slotgroups,
+ slotgroups * 32);
+
+ if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
+ dev_warn(&dd->pdev->dev,
+ "Warning: driver only supports "
+ "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
+ slotgroups = MTIP_MAX_SLOT_GROUPS;
+ }
+ dd->slot_groups = slotgroups;
+ return;
+ }
+
+ dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
+}
+
+/*
+ * Blocking wait for FTL rebuild to complete
+ *
+ * @dd Pointer to the DRIVER_DATA structure.
+ *
+ * return value
+ * 0 FTL rebuild completed successfully
+ * -EFAULT FTL rebuild error/timeout/interruption
+ */
+static int mtip_ftl_rebuild_poll(struct driver_data *dd)
+{
+ unsigned long timeout, cnt = 0, start;
+
+ dev_warn(&dd->pdev->dev,
+ "FTL rebuild in progress. Polling for completion.\n");
+
+ start = jiffies;
+ dd->ftlrebuildflag = 1;
+ timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
+
+ do {
+ if (mtip_check_surprise_removal(dd->pdev))
+ return -EFAULT;
+
+ if (mtip_get_identify(dd->port, NULL) < 0)
+ return -EFAULT;
+
+ if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
+ MTIP_FTL_REBUILD_MAGIC) {
+ ssleep(1);
+ /* Print message every 3 minutes */
+ if (cnt++ >= 180) {
+ dev_warn(&dd->pdev->dev,
+ "FTL rebuild in progress (%d secs).\n",
+ jiffies_to_msecs(jiffies - start) / 1000);
+ cnt = 0;
+ }
+ } else {
+ dev_warn(&dd->pdev->dev,
+ "FTL rebuild complete (%d secs).\n",
+ jiffies_to_msecs(jiffies - start) / 1000);
+ dd->ftlrebuildflag = 0;
+ mtip_block_initialize(dd);
+ break;
+ }
+ ssleep(10);
+ } while (time_before(jiffies, timeout));
+
+ /* Check for timeout */
+ if (dd->ftlrebuildflag) {
+ dev_err(&dd->pdev->dev,
+ "Timed out waiting for FTL rebuild to complete (%d secs).\n",
+ jiffies_to_msecs(jiffies - start) / 1000);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/*
+ * service thread to issue queued commands
+ *
+ * @data Pointer to the driver data structure.
+ *
+ * return value
+ * 0
+ */
+
+static int mtip_service_thread(void *data)
+{
+ struct driver_data *dd = (struct driver_data *)data;
+ unsigned long slot, slot_start, slot_wrap;
+ unsigned int num_cmd_slots = dd->slot_groups * 32;
+ struct mtip_port *port = dd->port;
+
+ while (1) {
+ /*
+ * the condition is to check neither an internal command is
+ * is in progress nor error handling is active
+ */
+ wait_event_interruptible(port->svc_wait, (port->flags) &&
+ !test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) &&
+ !test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags));
+
+ if (kthread_should_stop())
+ break;
+
+ set_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
+ if (test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) {
+ slot = 1;
+ /* used to restrict the loop to one iteration */
+ slot_start = num_cmd_slots;
+ slot_wrap = 0;
+ while (1) {
+ slot = find_next_bit(port->cmds_to_issue,
+ num_cmd_slots, slot);
+ if (slot_wrap == 1) {
+ if ((slot_start >= slot) ||
+ (slot >= num_cmd_slots))
+ break;
+ }
+ if (unlikely(slot_start == num_cmd_slots))
+ slot_start = slot;
+
+ if (unlikely(slot == num_cmd_slots)) {
+ slot = 1;
+ slot_wrap = 1;
+ continue;
+ }
+
+ /* Issue the command to the hardware */
+ mtip_issue_ncq_command(port, slot);
+
+ /* Set the command's timeout value.*/
+ port->commands[slot].comp_time = jiffies +
+ msecs_to_jiffies(MTIP_NCQ_COMMAND_TIMEOUT_MS);
+
+ clear_bit(slot, port->cmds_to_issue);
+ }
+
+ clear_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags);
+ } else if (test_bit(MTIP_FLAG_REBUILD_BIT, &port->flags)) {
+ mtip_ftl_rebuild_poll(dd);
+ clear_bit(MTIP_FLAG_REBUILD_BIT, &port->flags);
+ }
+ clear_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags);
+
+ if (test_bit(MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT, &port->flags))
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Called once for each card.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 on success, else an error code.
+ */
+static int mtip_hw_init(struct driver_data *dd)
+{
+ int i;
+ int rv;
+ unsigned int num_command_slots;
+
+ dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
+
+ mtip_detect_product(dd);
+ if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
+ rv = -EIO;
+ goto out1;
+ }
+ num_command_slots = dd->slot_groups * 32;
+
+ hba_setup(dd);
+
+ tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);
+
+ dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
+ if (!dd->port) {
+ dev_err(&dd->pdev->dev,
+ "Memory allocation: port structure\n");
+ return -ENOMEM;
+ }
+
+ /* Counting semaphore to track command slot usage */
+ sema_init(&dd->port->cmd_slot, num_command_slots - 1);
+
+ /* Spinlock to prevent concurrent issue */
+ spin_lock_init(&dd->port->cmd_issue_lock);
+
+ /* Set the port mmio base address. */
+ dd->port->mmio = dd->mmio + PORT_OFFSET;
+ dd->port->dd = dd;
+
+ /* Allocate memory for the command list. */
+ dd->port->command_list =
+ dmam_alloc_coherent(&dd->pdev->dev,
+ HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
+ &dd->port->command_list_dma,
+ GFP_KERNEL);
+ if (!dd->port->command_list) {
+ dev_err(&dd->pdev->dev,
+ "Memory allocation: command list\n");
+ rv = -ENOMEM;
+ goto out1;
+ }
+
+ /* Clear the memory we have allocated. */
+ memset(dd->port->command_list,
+ 0,
+ HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2));
+
+ /* Setup the addresse of the RX FIS. */
+ dd->port->rxfis = dd->port->command_list + HW_CMD_SLOT_SZ;
+ dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
+
+ /* Setup the address of the command tables. */
+ dd->port->command_table = dd->port->rxfis + AHCI_RX_FIS_SZ;
+ dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
+
+ /* Setup the address of the identify data. */
+ dd->port->identify = dd->port->command_table +
+ HW_CMD_TBL_AR_SZ;
+ dd->port->identify_dma = dd->port->command_tbl_dma +
+ HW_CMD_TBL_AR_SZ;
+
+ /* Setup the address of the sector buffer. */
+ dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
+ dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
+
+ /* Point the command headers at the command tables. */
+ for (i = 0; i < num_command_slots; i++) {
+ dd->port->commands[i].command_header =
+ dd->port->command_list +
+ (sizeof(struct mtip_cmd_hdr) * i);
+ dd->port->commands[i].command_header_dma =
+ dd->port->command_list_dma +
+ (sizeof(struct mtip_cmd_hdr) * i);
+
+ dd->port->commands[i].command =
+ dd->port->command_table + (HW_CMD_TBL_SZ * i);
+ dd->port->commands[i].command_dma =
+ dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
+
+ if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
+ dd->port->commands[i].command_header->ctbau =
+ __force_bit2int cpu_to_le32(
+ (dd->port->commands[i].command_dma >> 16) >> 16);
+ dd->port->commands[i].command_header->ctba =
+ __force_bit2int cpu_to_le32(
+ dd->port->commands[i].command_dma & 0xFFFFFFFF);
+
+ /*
+ * If this is not done, a bug is reported by the stock
+ * FC11 i386. Due to the fact that it has lots of kernel
+ * debugging enabled.
+ */
+ sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
+
+ /* Mark all commands as currently inactive.*/
+ atomic_set(&dd->port->commands[i].active, 0);
+ }
+
+ /* Setup the pointers to the extended s_active and CI registers. */
+ for (i = 0; i < dd->slot_groups; i++) {
+ dd->port->s_active[i] =
+ dd->port->mmio + i*0x80 + PORT_SCR_ACT;
+ dd->port->cmd_issue[i] =
+ dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
+ dd->port->completed[i] =
+ dd->port->mmio + i*0x80 + PORT_SDBV;
+ }
+
+ /* Reset the HBA. */
+ if (mtip_hba_reset(dd) < 0) {
+ dev_err(&dd->pdev->dev,
+ "Card did not reset within timeout\n");
+ rv = -EIO;
+ goto out2;
+ }
+
+ mtip_init_port(dd->port);
+ mtip_start_port(dd->port);
+
+ /* Setup the ISR and enable interrupts. */
+ rv = devm_request_irq(&dd->pdev->dev,
+ dd->pdev->irq,
+ mtip_irq_handler,
+ IRQF_SHARED,
+ dev_driver_string(&dd->pdev->dev),
+ dd);
+
+ if (rv) {
+ dev_err(&dd->pdev->dev,
+ "Unable to allocate IRQ %d\n", dd->pdev->irq);
+ goto out2;
+ }
+
+ /* Enable interrupts on the HBA. */
+ writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
+ dd->mmio + HOST_CTL);
+
+ init_timer(&dd->port->cmd_timer);
+ init_waitqueue_head(&dd->port->svc_wait);
+
+ dd->port->cmd_timer.data = (unsigned long int) dd->port;
+ dd->port->cmd_timer.function = mtip_timeout_function;
+ mod_timer(&dd->port->cmd_timer,
+ jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
+
+ if (mtip_get_identify(dd->port, NULL) < 0) {
+ rv = -EFAULT;
+ goto out3;
+ }
+
+ if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
+ MTIP_FTL_REBUILD_MAGIC) {
+ set_bit(MTIP_FLAG_REBUILD_BIT, &dd->port->flags);
+ return MTIP_FTL_REBUILD_MAGIC;
+ }
+ mtip_dump_identify(dd->port);
+ return rv;
+
+out3:
+ del_timer_sync(&dd->port->cmd_timer);
+
+ /* Disable interrupts on the HBA. */
+ writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
+ dd->mmio + HOST_CTL);
+
+ /*Release the IRQ. */
+ devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
+
+out2:
+ mtip_deinit_port(dd->port);
+
+ /* Free the command/command header memory. */
+ dmam_free_coherent(&dd->pdev->dev,
+ HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
+ dd->port->command_list,
+ dd->port->command_list_dma);
+out1:
+ /* Free the memory allocated for the for structure. */
+ kfree(dd->port);
+
+ return rv;
+}
+
+/*
+ * Called to deinitialize an interface.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0
+ */
+static int mtip_hw_exit(struct driver_data *dd)
+{
+ /*
+ * Send standby immediate (E0h) to the drive so that it
+ * saves its state.
+ */
+ if (atomic_read(&dd->drv_cleanup_done) != true) {
+
+ mtip_standby_immediate(dd->port);
+
+ /* de-initialize the port. */
+ mtip_deinit_port(dd->port);
+
+ /* Disable interrupts on the HBA. */
+ writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
+ dd->mmio + HOST_CTL);
+ }
+
+ del_timer_sync(&dd->port->cmd_timer);
+
+ /* Release the IRQ. */
+ devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
+
+ /* Stop the bottom half tasklet. */
+ tasklet_kill(&dd->tasklet);
+
+ /* Free the command/command header memory. */
+ dmam_free_coherent(&dd->pdev->dev,
+ HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2),
+ dd->port->command_list,
+ dd->port->command_list_dma);
+ /* Free the memory allocated for the for structure. */
+ kfree(dd->port);
+
+ return 0;
+}
+
+/*
+ * Issue a Standby Immediate command to the device.
+ *
+ * This function is called by the Block Layer just before the
+ * system powers off during a shutdown.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0
+ */
+static int mtip_hw_shutdown(struct driver_data *dd)
+{
+ /*
+ * Send standby immediate (E0h) to the drive so that it
+ * saves its state.
+ */
+ mtip_standby_immediate(dd->port);
+
+ return 0;
+}
+
+/*
+ * Suspend function
+ *
+ * This function is called by the Block Layer just before the
+ * system hibernates.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 Suspend was successful
+ * -EFAULT Suspend was not successful
+ */
+static int mtip_hw_suspend(struct driver_data *dd)
+{
+ /*
+ * Send standby immediate (E0h) to the drive
+ * so that it saves its state.
+ */
+ if (mtip_standby_immediate(dd->port) != 0) {
+ dev_err(&dd->pdev->dev,
+ "Failed standby-immediate command\n");
+ return -EFAULT;
+ }
+
+ /* Disable interrupts on the HBA.*/
+ writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
+ dd->mmio + HOST_CTL);
+ mtip_deinit_port(dd->port);
+
+ return 0;
+}
+
+/*
+ * Resume function
+ *
+ * This function is called by the Block Layer as the
+ * system resumes.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 Resume was successful
+ * -EFAULT Resume was not successful
+ */
+static int mtip_hw_resume(struct driver_data *dd)
+{
+ /* Perform any needed hardware setup steps */
+ hba_setup(dd);
+
+ /* Reset the HBA */
+ if (mtip_hba_reset(dd) != 0) {
+ dev_err(&dd->pdev->dev,
+ "Unable to reset the HBA\n");
+ return -EFAULT;
+ }
+
+ /*
+ * Enable the port, DMA engine, and FIS reception specific
+ * h/w in controller.
+ */
+ mtip_init_port(dd->port);
+ mtip_start_port(dd->port);
+
+ /* Enable interrupts on the HBA.*/
+ writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
+ dd->mmio + HOST_CTL);
+
+ return 0;
+}
+
+/*
+ * Helper function for reusing disk name
+ * upon hot insertion.
+ */
+static int rssd_disk_name_format(char *prefix,
+ int index,
+ char *buf,
+ int buflen)
+{
+ const int base = 'z' - 'a' + 1;
+ char *begin = buf + strlen(prefix);
+ char *end = buf + buflen;
+ char *p;
+ int unit;
+
+ p = end - 1;
+ *p = '\0';
+ unit = base;
+ do {
+ if (p == begin)
+ return -EINVAL;
+ *--p = 'a' + (index % unit);
+ index = (index / unit) - 1;
+ } while (index >= 0);
+
+ memmove(begin, p, end - p);
+ memcpy(buf, prefix, strlen(prefix));
+
+ return 0;
+}
+
+/*
+ * Block layer IOCTL handler.
+ *
+ * @dev Pointer to the block_device structure.
+ * @mode ignored
+ * @cmd IOCTL command passed from the user application.
+ * @arg Argument passed from the user application.
+ *
+ * return value
+ * 0 IOCTL completed successfully.
+ * -ENOTTY IOCTL not supported or invalid driver data
+ * structure pointer.
+ */
+static int mtip_block_ioctl(struct block_device *dev,
+ fmode_t mode,
+ unsigned cmd,
+ unsigned long arg)
+{
+ struct driver_data *dd = dev->bd_disk->private_data;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (!dd)
+ return -ENOTTY;
+
+ switch (cmd) {
+ case BLKFLSBUF:
+ return -ENOTTY;
+ default:
+ return mtip_hw_ioctl(dd, cmd, arg);
+ }
+}
+
+#ifdef CONFIG_COMPAT
+/*
+ * Block layer compat IOCTL handler.
+ *
+ * @dev Pointer to the block_device structure.
+ * @mode ignored
+ * @cmd IOCTL command passed from the user application.
+ * @arg Argument passed from the user application.
+ *
+ * return value
+ * 0 IOCTL completed successfully.
+ * -ENOTTY IOCTL not supported or invalid driver data
+ * structure pointer.
+ */
+static int mtip_block_compat_ioctl(struct block_device *dev,
+ fmode_t mode,
+ unsigned cmd,
+ unsigned long arg)
+{
+ struct driver_data *dd = dev->bd_disk->private_data;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (!dd)
+ return -ENOTTY;
+
+ switch (cmd) {
+ case BLKFLSBUF:
+ return -ENOTTY;
+ case HDIO_DRIVE_TASKFILE: {
+ struct mtip_compat_ide_task_request_s __user *compat_req_task;
+ ide_task_request_t req_task;
+ int compat_tasksize, outtotal, ret;
+
+ compat_tasksize =
+ sizeof(struct mtip_compat_ide_task_request_s);
+
+ compat_req_task =
+ (struct mtip_compat_ide_task_request_s __user *) arg;
+
+ if (copy_from_user(&req_task, (void __user *) arg,
+ compat_tasksize - (2 * sizeof(compat_long_t))))
+ return -EFAULT;
+
+ if (get_user(req_task.out_size, &compat_req_task->out_size))
+ return -EFAULT;
+
+ if (get_user(req_task.in_size, &compat_req_task->in_size))
+ return -EFAULT;
+
+ outtotal = sizeof(struct mtip_compat_ide_task_request_s);
+
+ ret = exec_drive_taskfile(dd, (void __user *) arg,
+ &req_task, outtotal);
+
+ if (copy_to_user((void __user *) arg, &req_task,
+ compat_tasksize -
+ (2 * sizeof(compat_long_t))))
+ return -EFAULT;
+
+ if (put_user(req_task.out_size, &compat_req_task->out_size))
+ return -EFAULT;
+
+ if (put_user(req_task.in_size, &compat_req_task->in_size))
+ return -EFAULT;
+
+ return ret;
+ }
+ default:
+ return mtip_hw_ioctl(dd, cmd, arg);
+ }
+}
+#endif
+
+/*
+ * Obtain the geometry of the device.
+ *
+ * You may think that this function is obsolete, but some applications,
+ * fdisk for example still used CHS values. This function describes the
+ * device as having 224 heads and 56 sectors per cylinder. These values are
+ * chosen so that each cylinder is aligned on a 4KB boundary. Since a
+ * partition is described in terms of a start and end cylinder this means
+ * that each partition is also 4KB aligned. Non-aligned partitions adversely
+ * affects performance.
+ *
+ * @dev Pointer to the block_device strucutre.
+ * @geo Pointer to a hd_geometry structure.
+ *
+ * return value
+ * 0 Operation completed successfully.
+ * -ENOTTY An error occurred while reading the drive capacity.
+ */
+static int mtip_block_getgeo(struct block_device *dev,
+ struct hd_geometry *geo)
+{
+ struct driver_data *dd = dev->bd_disk->private_data;
+ sector_t capacity;
+
+ if (!dd)
+ return -ENOTTY;
+
+ if (!(mtip_hw_get_capacity(dd, &capacity))) {
+ dev_warn(&dd->pdev->dev,
+ "Could not get drive capacity.\n");
+ return -ENOTTY;
+ }
+
+ geo->heads = 224;
+ geo->sectors = 56;
+ sector_div(capacity, (geo->heads * geo->sectors));
+ geo->cylinders = capacity;
+ return 0;
+}
+
+/*
+ * Block device operation function.
+ *
+ * This structure contains pointers to the functions required by the block
+ * layer.
+ */
+static const struct block_device_operations mtip_block_ops = {
+ .ioctl = mtip_block_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = mtip_block_compat_ioctl,
+#endif
+ .getgeo = mtip_block_getgeo,
+ .owner = THIS_MODULE
+};
+
+/*
+ * Block layer make request function.
+ *
+ * This function is called by the kernel to process a BIO for
+ * the P320 device.
+ *
+ * @queue Pointer to the request queue. Unused other than to obtain
+ * the driver data structure.
+ * @bio Pointer to the BIO.
+ *
+ */
+static void mtip_make_request(struct request_queue *queue, struct bio *bio)
+{
+ struct driver_data *dd = queue->queuedata;
+ struct scatterlist *sg;
+ struct bio_vec *bvec;
+ int nents = 0;
+ int tag = 0;
+
+ if (unlikely(!bio_has_data(bio))) {
+ blk_queue_flush(queue, 0);
+ bio_endio(bio, 0);
+ return;
+ }
+
+ sg = mtip_hw_get_scatterlist(dd, &tag);
+ if (likely(sg != NULL)) {
+ blk_queue_bounce(queue, &bio);
+
+ if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
+ dev_warn(&dd->pdev->dev,
+ "Maximum number of SGL entries exceeded");
+ bio_io_error(bio);
+ mtip_hw_release_scatterlist(dd, tag);
+ return;
+ }
+
+ /* Create the scatter list for this bio. */
+ bio_for_each_segment(bvec, bio, nents) {
+ sg_set_page(&sg[nents],
+ bvec->bv_page,
+ bvec->bv_len,
+ bvec->bv_offset);
+ }
+
+ /* Issue the read/write. */
+ mtip_hw_submit_io(dd,
+ bio->bi_sector,
+ bio_sectors(bio),
+ nents,
+ tag,
+ bio_endio,
+ bio,
+ bio->bi_rw & REQ_FUA,
+ bio_data_dir(bio));
+ } else
+ bio_io_error(bio);
+}
+
+/*
+ * Block layer initialization function.
+ *
+ * This function is called once by the PCI layer for each P320
+ * device that is connected to the system.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0 on success else an error code.
+ */
+static int mtip_block_initialize(struct driver_data *dd)
+{
+ int rv = 0, wait_for_rebuild = 0;
+ sector_t capacity;
+ unsigned int index = 0;
+ struct kobject *kobj;
+ unsigned char thd_name[16];
+
+ if (dd->disk)
+ goto skip_create_disk; /* hw init done, before rebuild */
+
+ /* Initialize the protocol layer. */
+ wait_for_rebuild = mtip_hw_init(dd);
+ if (wait_for_rebuild < 0) {
+ dev_err(&dd->pdev->dev,
+ "Protocol layer initialization failed\n");
+ rv = -EINVAL;
+ goto protocol_init_error;
+ }
+
+ dd->disk = alloc_disk(MTIP_MAX_MINORS);
+ if (dd->disk == NULL) {
+ dev_err(&dd->pdev->dev,
+ "Unable to allocate gendisk structure\n");
+ rv = -EINVAL;
+ goto alloc_disk_error;
+ }
+
+ /* Generate the disk name, implemented same as in sd.c */
+ do {
+ if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
+ goto ida_get_error;
+
+ spin_lock(&rssd_index_lock);
+ rv = ida_get_new(&rssd_index_ida, &index);
+ spin_unlock(&rssd_index_lock);
+ } while (rv == -EAGAIN);
+
+ if (rv)
+ goto ida_get_error;
+
+ rv = rssd_disk_name_format("rssd",
+ index,
+ dd->disk->disk_name,
+ DISK_NAME_LEN);
+ if (rv)
+ goto disk_index_error;
+
+ dd->disk->driverfs_dev = &dd->pdev->dev;
+ dd->disk->major = dd->major;
+ dd->disk->first_minor = dd->instance * MTIP_MAX_MINORS;
+ dd->disk->fops = &mtip_block_ops;
+ dd->disk->private_data = dd;
+ dd->index = index;
+
+ /*
+ * if rebuild pending, start the service thread, and delay the block
+ * queue creation and add_disk()
+ */
+ if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
+ goto start_service_thread;
+
+skip_create_disk:
+ /* Allocate the request queue. */
+ dd->queue = blk_alloc_queue(GFP_KERNEL);
+ if (dd->queue == NULL) {
+ dev_err(&dd->pdev->dev,
+ "Unable to allocate request queue\n");
+ rv = -ENOMEM;
+ goto block_queue_alloc_init_error;
+ }
+
+ /* Attach our request function to the request queue. */
+ blk_queue_make_request(dd->queue, mtip_make_request);
+
+ dd->disk->queue = dd->queue;
+ dd->queue->queuedata = dd;
+
+ /* Set device limits. */
+ set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
+ blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
+ blk_queue_physical_block_size(dd->queue, 4096);
+ blk_queue_io_min(dd->queue, 4096);
+ blk_queue_flush(dd->queue, 0);
+
+ /* Set the capacity of the device in 512 byte sectors. */
+ if (!(mtip_hw_get_capacity(dd, &capacity))) {
+ dev_warn(&dd->pdev->dev,
+ "Could not read drive capacity\n");
+ rv = -EIO;
+ goto read_capacity_error;
+ }
+ set_capacity(dd->disk, capacity);
+
+ /* Enable the block device and add it to /dev */
+ add_disk(dd->disk);
+
+ /*
+ * Now that the disk is active, initialize any sysfs attributes
+ * managed by the protocol layer.
+ */
+ kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
+ if (kobj) {
+ mtip_hw_sysfs_init(dd, kobj);
+ kobject_put(kobj);
+ }
+
+ if (dd->mtip_svc_handler)
+ return rv; /* service thread created for handling rebuild */
+
+start_service_thread:
+ sprintf(thd_name, "mtip_svc_thd_%02d", index);
+
+ dd->mtip_svc_handler = kthread_run(mtip_service_thread,
+ dd, thd_name);
+
+ if (IS_ERR(dd->mtip_svc_handler)) {
+ printk(KERN_ERR "mtip32xx: service thread failed to start\n");
+ dd->mtip_svc_handler = NULL;
+ rv = -EFAULT;
+ goto kthread_run_error;
+ }
+
+ return rv;
+
+kthread_run_error:
+ /* Delete our gendisk. This also removes the device from /dev */
+ del_gendisk(dd->disk);
+
+read_capacity_error:
+ blk_cleanup_queue(dd->queue);
+
+block_queue_alloc_init_error:
+disk_index_error:
+ spin_lock(&rssd_index_lock);
+ ida_remove(&rssd_index_ida, index);
+ spin_unlock(&rssd_index_lock);
+
+ida_get_error:
+ put_disk(dd->disk);
+
+alloc_disk_error:
+ mtip_hw_exit(dd); /* De-initialize the protocol layer. */
+
+protocol_init_error:
+ return rv;
+}
+
+/*
+ * Block layer deinitialization function.
+ *
+ * Called by the PCI layer as each P320 device is removed.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0
+ */
+static int mtip_block_remove(struct driver_data *dd)
+{
+ struct kobject *kobj;
+
+ if (dd->mtip_svc_handler) {
+ set_bit(MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT, &dd->port->flags);
+ wake_up_interruptible(&dd->port->svc_wait);
+ kthread_stop(dd->mtip_svc_handler);
+ }
+
+ /* Clean up the sysfs attributes managed by the protocol layer. */
+ kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
+ if (kobj) {
+ mtip_hw_sysfs_exit(dd, kobj);
+ kobject_put(kobj);
+ }
+
+ /*
+ * Delete our gendisk structure. This also removes the device
+ * from /dev
+ */
+ del_gendisk(dd->disk);
+ blk_cleanup_queue(dd->queue);
+ dd->disk = NULL;
+ dd->queue = NULL;
+
+ /* De-initialize the protocol layer. */
+ mtip_hw_exit(dd);
+
+ return 0;
+}
+
+/*
+ * Function called by the PCI layer when just before the
+ * machine shuts down.
+ *
+ * If a protocol layer shutdown function is present it will be called
+ * by this function.
+ *
+ * @dd Pointer to the driver data structure.
+ *
+ * return value
+ * 0
+ */
+static int mtip_block_shutdown(struct driver_data *dd)
+{
+ dev_info(&dd->pdev->dev,
+ "Shutting down %s ...\n", dd->disk->disk_name);
+
+ /* Delete our gendisk structure, and cleanup the blk queue. */
+ del_gendisk(dd->disk);
+ blk_cleanup_queue(dd->queue);
+ dd->disk = NULL;
+ dd->queue = NULL;
+
+ mtip_hw_shutdown(dd);
+ return 0;
+}
+
+static int mtip_block_suspend(struct driver_data *dd)
+{
+ dev_info(&dd->pdev->dev,
+ "Suspending %s ...\n", dd->disk->disk_name);
+ mtip_hw_suspend(dd);
+ return 0;
+}
+
+static int mtip_block_resume(struct driver_data *dd)
+{
+ dev_info(&dd->pdev->dev, "Resuming %s ...\n",
+ dd->disk->disk_name);
+ mtip_hw_resume(dd);
+ return 0;
+}
+
+/*
+ * Called for each supported PCI device detected.
+ *
+ * This function allocates the private data structure, enables the
+ * PCI device and then calls the block layer initialization function.
+ *
+ * return value
+ * 0 on success else an error code.
+ */
+static int mtip_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int rv = 0;
+ struct driver_data *dd = NULL;
+
+ /* Allocate memory for this devices private data. */
+ dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL);
+ if (dd == NULL) {
+ dev_err(&pdev->dev,
+ "Unable to allocate memory for driver data\n");
+ return -ENOMEM;
+ }
+
+ /* Set the atomic variable as 1 in case of SRSI */
+ atomic_set(&dd->drv_cleanup_done, true);
+
+ atomic_set(&dd->resumeflag, false);
+
+ /* Attach the private data to this PCI device. */
+ pci_set_drvdata(pdev, dd);
+
+ rv = pcim_enable_device(pdev);
+ if (rv < 0) {
+ dev_err(&pdev->dev, "Unable to enable device\n");
+ goto iomap_err;
+ }
+
+ /* Map BAR5 to memory. */
+ rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
+ if (rv < 0) {
+ dev_err(&pdev->dev, "Unable to map regions\n");
+ goto iomap_err;
+ }
+
+ if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
+ rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+
+ if (rv) {
+ rv = pci_set_consistent_dma_mask(pdev,
+ DMA_BIT_MASK(32));
+ if (rv) {
+ dev_warn(&pdev->dev,
+ "64-bit DMA enable failed\n");
+ goto setmask_err;
+ }
+ }
+ }
+
+ pci_set_master(pdev);
+
+ if (pci_enable_msi(pdev)) {
+ dev_warn(&pdev->dev,
+ "Unable to enable MSI interrupt.\n");
+ goto block_initialize_err;
+ }
+
+ /* Copy the info we may need later into the private data structure. */
+ dd->major = mtip_major;
+ dd->instance = instance;
+ dd->pdev = pdev;
+
+ /* Initialize the block layer. */
+ rv = mtip_block_initialize(dd);
+ if (rv < 0) {
+ dev_err(&pdev->dev,
+ "Unable to initialize block layer\n");
+ goto block_initialize_err;
+ }
+
+ /*
+ * Increment the instance count so that each device has a unique
+ * instance number.
+ */
+ instance++;
+
+ goto done;
+
+block_initialize_err:
+ pci_disable_msi(pdev);
+
+setmask_err:
+ pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
+
+iomap_err:
+ kfree(dd);
+ pci_set_drvdata(pdev, NULL);
+ return rv;
+done:
+ /* Set the atomic variable as 0 in case of SRSI */
+ atomic_set(&dd->drv_cleanup_done, true);
+
+ return rv;
+}
+
+/*
+ * Called for each probed device when the device is removed or the
+ * driver is unloaded.
+ *
+ * return value
+ * None
+ */
+static void mtip_pci_remove(struct pci_dev *pdev)
+{
+ struct driver_data *dd = pci_get_drvdata(pdev);
+ int counter = 0;
+
+ if (mtip_check_surprise_removal(pdev)) {
+ while (atomic_read(&dd->drv_cleanup_done) == false) {
+ counter++;
+ msleep(20);
+ if (counter == 10) {
+ /* Cleanup the outstanding commands */
+ mtip_command_cleanup(dd);
+ break;
+ }
+ }
+ }
+ /* Set the atomic variable as 1 in case of SRSI */
+ atomic_set(&dd->drv_cleanup_done, true);
+
+ /* Clean up the block layer. */
+ mtip_block_remove(dd);
+
+ pci_disable_msi(pdev);
+
+ kfree(dd);
+ pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
+}
+
+/*
+ * Called for each probed device when the device is suspended.
+ *
+ * return value
+ * 0 Success
+ * <0 Error
+ */
+static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+ int rv = 0;
+ struct driver_data *dd = pci_get_drvdata(pdev);
+
+ if (!dd) {
+ dev_err(&pdev->dev,
+ "Driver private datastructure is NULL\n");
+ return -EFAULT;
+ }
+
+ atomic_set(&dd->resumeflag, true);
+
+ /* Disable ports & interrupts then send standby immediate */
+ rv = mtip_block_suspend(dd);
+ if (rv < 0) {
+ dev_err(&pdev->dev,
+ "Failed to suspend controller\n");
+ return rv;
+ }
+
+ /*
+ * Save the pci config space to pdev structure &
+ * disable the device
+ */
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+
+ /* Move to Low power state*/
+ pci_set_power_state(pdev, PCI_D3hot);
+
+ return rv;
+}
+
+/*
+ * Called for each probed device when the device is resumed.
+ *
+ * return value
+ * 0 Success
+ * <0 Error
+ */
+static int mtip_pci_resume(struct pci_dev *pdev)
+{
+ int rv = 0;
+ struct driver_data *dd;
+
+ dd = pci_get_drvdata(pdev);
+ if (!dd) {
+ dev_err(&pdev->dev,
+ "Driver private datastructure is NULL\n");
+ return -EFAULT;
+ }
+
+ /* Move the device to active State */
+ pci_set_power_state(pdev, PCI_D0);
+
+ /* Restore PCI configuration space */
+ pci_restore_state(pdev);
+
+ /* Enable the PCI device*/
+ rv = pcim_enable_device(pdev);
+ if (rv < 0) {
+ dev_err(&pdev->dev,
+ "Failed to enable card during resume\n");
+ goto err;
+ }
+ pci_set_master(pdev);
+
+ /*
+ * Calls hbaReset, initPort, & startPort function
+ * then enables interrupts
+ */
+ rv = mtip_block_resume(dd);
+ if (rv < 0)
+ dev_err(&pdev->dev, "Unable to resume\n");
+
+err:
+ atomic_set(&dd->resumeflag, false);
+
+ return rv;
+}
+
+/*
+ * Shutdown routine
+ *
+ * return value
+ * None
+ */
+static void mtip_pci_shutdown(struct pci_dev *pdev)
+{
+ struct driver_data *dd = pci_get_drvdata(pdev);
+ if (dd)
+ mtip_block_shutdown(dd);
+}
+
+/* Table of device ids supported by this driver. */
+static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
+ { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320_DEVICE_ID) },
+ { 0 }
+};
+
+/* Structure that describes the PCI driver functions. */
+static struct pci_driver mtip_pci_driver = {
+ .name = MTIP_DRV_NAME,
+ .id_table = mtip_pci_tbl,
+ .probe = mtip_pci_probe,
+ .remove = mtip_pci_remove,
+ .suspend = mtip_pci_suspend,
+ .resume = mtip_pci_resume,
+ .shutdown = mtip_pci_shutdown,
+};
+
+MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
+
+/*
+ * Module initialization function.
+ *
+ * Called once when the module is loaded. This function allocates a major
+ * block device number to the Cyclone devices and registers the PCI layer
+ * of the driver.
+ *
+ * Return value
+ * 0 on success else error code.
+ */
+static int __init mtip_init(void)
+{
+ printk(KERN_INFO MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
+
+ /* Allocate a major block device number to use with this driver. */
+ mtip_major = register_blkdev(0, MTIP_DRV_NAME);
+ if (mtip_major < 0) {
+ printk(KERN_ERR "Unable to register block device (%d)\n",
+ mtip_major);
+ return -EBUSY;
+ }
+
+ /* Register our PCI operations. */
+ return pci_register_driver(&mtip_pci_driver);
+}
+
+/*
+ * Module de-initialization function.
+ *
+ * Called once when the module is unloaded. This function deallocates
+ * the major block device number allocated by mtip_init() and
+ * unregisters the PCI layer of the driver.
+ *
+ * Return value
+ * none
+ */
+static void __exit mtip_exit(void)
+{
+ /* Release the allocated major block device number. */
+ unregister_blkdev(mtip_major, MTIP_DRV_NAME);
+
+ /* Unregister the PCI driver. */
+ pci_unregister_driver(&mtip_pci_driver);
+}
+
+MODULE_AUTHOR("Micron Technology, Inc");
+MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(MTIP_DRV_VERSION);
+
+module_init(mtip_init);
+module_exit(mtip_exit);
diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
new file mode 100644
index 00000000000..723d7c4946d
--- /dev/null
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -0,0 +1,423 @@
+/*
+ * mtip32xx.h - Header file for the P320 SSD Block Driver
+ * Copyright (C) 2011 Micron Technology, Inc.
+ *
+ * Portions of this code were derived from works subjected to the
+ * following copyright:
+ * Copyright (C) 2009 Integrated Device Technology, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __MTIP32XX_H__
+#define __MTIP32XX_H__
+
+#include <linux/spinlock.h>
+#include <linux/rwsem.h>
+#include <linux/ata.h>
+#include <linux/interrupt.h>
+#include <linux/genhd.h>
+#include <linux/version.h>
+
+/* Offset of Subsystem Device ID in pci confoguration space */
+#define PCI_SUBSYSTEM_DEVICEID 0x2E
+
+/* offset of Device Control register in PCIe extended capabilites space */
+#define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET 0x48
+
+/* # of times to retry timed out IOs */
+#define MTIP_MAX_RETRIES 5
+
+/* Various timeout values in ms */
+#define MTIP_NCQ_COMMAND_TIMEOUT_MS 5000
+#define MTIP_IOCTL_COMMAND_TIMEOUT_MS 5000
+#define MTIP_INTERNAL_COMMAND_TIMEOUT_MS 5000
+
+/* check for timeouts every 500ms */
+#define MTIP_TIMEOUT_CHECK_PERIOD 500
+
+/* ftl rebuild */
+#define MTIP_FTL_REBUILD_OFFSET 142
+#define MTIP_FTL_REBUILD_MAGIC 0xED51
+#define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000
+
+/* Macro to extract the tag bit number from a tag value. */
+#define MTIP_TAG_BIT(tag) (tag & 0x1F)
+
+/*
+ * Macro to extract the tag index from a tag value. The index
+ * is used to access the correct s_active/Command Issue register based
+ * on the tag value.
+ */
+#define MTIP_TAG_INDEX(tag) (tag >> 5)
+
+/*
+ * Maximum number of scatter gather entries
+ * a single command may have.
+ */
+#define MTIP_MAX_SG 128
+
+/*
+ * Maximum number of slot groups (Command Issue & s_active registers)
+ * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
+ */
+#define MTIP_MAX_SLOT_GROUPS 8
+
+/* Internal command tag. */
+#define MTIP_TAG_INTERNAL 0
+
+/* Micron Vendor ID & P320x SSD Device ID */
+#define PCI_VENDOR_ID_MICRON 0x1344
+#define P320_DEVICE_ID 0x5150
+
+/* Driver name and version strings */
+#define MTIP_DRV_NAME "mtip32xx"
+#define MTIP_DRV_VERSION "1.2.6os3"
+
+/* Maximum number of minor device numbers per device. */
+#define MTIP_MAX_MINORS 16
+
+/* Maximum number of supported command slots. */
+#define MTIP_MAX_COMMAND_SLOTS (MTIP_MAX_SLOT_GROUPS * 32)
+
+/*
+ * Per-tag bitfield size in longs.
+ * Linux bit manipulation functions
+ * (i.e. test_and_set_bit, find_next_zero_bit)
+ * manipulate memory in longs, so we try to make the math work.
+ * take the slot groups and find the number of longs, rounding up.
+ * Careful! i386 and x86_64 use different size longs!
+ */
+#define U32_PER_LONG (sizeof(long) / sizeof(u32))
+#define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
+ (U32_PER_LONG-1))/U32_PER_LONG)
+
+/* BAR number used to access the HBA registers. */
+#define MTIP_ABAR 5
+
+/* Forced Unit Access Bit */
+#define FUA_BIT 0x80
+
+#ifdef DEBUG
+ #define dbg_printk(format, arg...) \
+ printk(pr_fmt(format), ##arg);
+#else
+ #define dbg_printk(format, arg...)
+#endif
+
+#define __force_bit2int (unsigned int __force)
+
+/* below are bit numbers in 'flags' defined in mtip_port */
+#define MTIP_FLAG_IC_ACTIVE_BIT 0
+#define MTIP_FLAG_EH_ACTIVE_BIT 1
+#define MTIP_FLAG_SVC_THD_ACTIVE_BIT 2
+#define MTIP_FLAG_ISSUE_CMDS_BIT 4
+#define MTIP_FLAG_REBUILD_BIT 5
+#define MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT 8
+
+/* Register Frame Information Structure (FIS), host to device. */
+struct host_to_dev_fis {
+ /*
+ * FIS type.
+ * - 27h Register FIS, host to device.
+ * - 34h Register FIS, device to host.
+ * - 39h DMA Activate FIS, device to host.
+ * - 41h DMA Setup FIS, bi-directional.
+ * - 46h Data FIS, bi-directional.
+ * - 58h BIST Activate FIS, bi-directional.
+ * - 5Fh PIO Setup FIS, device to host.
+ * - A1h Set Device Bits FIS, device to host.
+ */
+ unsigned char type;
+ unsigned char opts;
+ unsigned char command;
+ unsigned char features;
+
+ union {
+ unsigned char lba_low;
+ unsigned char sector;
+ };
+ union {
+ unsigned char lba_mid;
+ unsigned char cyl_low;
+ };
+ union {
+ unsigned char lba_hi;
+ unsigned char cyl_hi;
+ };
+ union {
+ unsigned char device;
+ unsigned char head;
+ };
+
+ union {
+ unsigned char lba_low_ex;
+ unsigned char sector_ex;
+ };
+ union {
+ unsigned char lba_mid_ex;
+ unsigned char cyl_low_ex;
+ };
+ union {
+ unsigned char lba_hi_ex;
+ unsigned char cyl_hi_ex;
+ };
+ unsigned char features_ex;
+
+ unsigned char sect_count;
+ unsigned char sect_cnt_ex;
+ unsigned char res2;
+ unsigned char control;
+
+ unsigned int res3;
+};
+
+/* Command header structure. */
+struct mtip_cmd_hdr {
+ /*
+ * Command options.
+ * - Bits 31:16 Number of PRD entries.
+ * - Bits 15:8 Unused in this implementation.
+ * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
+ * - Bit 6 Write bit, should be set when writing data to the device.
+ * - Bit 5 Unused in this implementation.
+ * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
+ */
+ unsigned int opts;
+ /* This field is unsed when using NCQ. */
+ union {
+ unsigned int byte_count;
+ unsigned int status;
+ };
+ /*
+ * Lower 32 bits of the command table address associated with this
+ * header. The command table addresses must be 128 byte aligned.
+ */
+ unsigned int ctba;
+ /*
+ * If 64 bit addressing is used this field is the upper 32 bits
+ * of the command table address associated with this command.
+ */
+ unsigned int ctbau;
+ /* Reserved and unused. */
+ unsigned int res[4];
+};
+
+/* Command scatter gather structure (PRD). */
+struct mtip_cmd_sg {
+ /*
+ * Low 32 bits of the data buffer address. For P320 this
+ * address must be 8 byte aligned signified by bits 2:0 being
+ * set to 0.
+ */
+ unsigned int dba;
+ /*
+ * When 64 bit addressing is used this field is the upper
+ * 32 bits of the data buffer address.
+ */
+ unsigned int dba_upper;
+ /* Unused. */
+ unsigned int reserved;
+ /*
+ * Bit 31: interrupt when this data block has been transferred.
+ * Bits 30..22: reserved
+ * Bits 21..0: byte count (minus 1). For P320 the byte count must be
+ * 8 byte aligned signified by bits 2:0 being set to 1.
+ */
+ unsigned int info;
+};
+struct mtip_port;
+
+/* Structure used to describe a command. */
+struct mtip_cmd {
+
+ struct mtip_cmd_hdr *command_header; /* ptr to command header entry */
+
+ dma_addr_t command_header_dma; /* corresponding physical address */
+
+ void *command; /* ptr to command table entry */
+
+ dma_addr_t command_dma; /* corresponding physical address */
+
+ void *comp_data; /* data passed to completion function comp_func() */
+ /*
+ * Completion function called by the ISR upon completion of
+ * a command.
+ */
+ void (*comp_func)(struct mtip_port *port,
+ int tag,
+ void *data,
+ int status);
+ /* Additional callback function that may be called by comp_func() */
+ void (*async_callback)(void *data, int status);
+
+ void *async_data; /* Addl. data passed to async_callback() */
+
+ int scatter_ents; /* Number of scatter list entries used */
+
+ struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
+
+ int retries; /* The number of retries left for this command. */
+
+ int direction; /* Data transfer direction */
+
+ unsigned long comp_time; /* command completion time, in jiffies */
+
+ atomic_t active; /* declares if this command sent to the drive. */
+};
+
+/* Structure used to describe a port. */
+struct mtip_port {
+ /* Pointer back to the driver data for this port. */
+ struct driver_data *dd;
+ /*
+ * Used to determine if the data pointed to by the
+ * identify field is valid.
+ */
+ unsigned long identify_valid;
+ /* Base address of the memory mapped IO for the port. */
+ void __iomem *mmio;
+ /* Array of pointers to the memory mapped s_active registers. */
+ void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
+ /* Array of pointers to the memory mapped completed registers. */
+ void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
+ /* Array of pointers to the memory mapped Command Issue registers. */
+ void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
+ /*
+ * Pointer to the beginning of the command header memory as used
+ * by the driver.
+ */
+ void *command_list;
+ /*
+ * Pointer to the beginning of the command header memory as used
+ * by the DMA.
+ */
+ dma_addr_t command_list_dma;
+ /*
+ * Pointer to the beginning of the RX FIS memory as used
+ * by the driver.
+ */
+ void *rxfis;
+ /*
+ * Pointer to the beginning of the RX FIS memory as used
+ * by the DMA.
+ */
+ dma_addr_t rxfis_dma;
+ /*
+ * Pointer to the beginning of the command table memory as used
+ * by the driver.
+ */
+ void *command_table;
+ /*
+ * Pointer to the beginning of the command table memory as used
+ * by the DMA.
+ */
+ dma_addr_t command_tbl_dma;
+ /*
+ * Pointer to the beginning of the identify data memory as used
+ * by the driver.
+ */
+ u16 *identify;
+ /*
+ * Pointer to the beginning of the identify data memory as used
+ * by the DMA.
+ */
+ dma_addr_t identify_dma;
+ /*
+ * Pointer to the beginning of a sector buffer that is used
+ * by the driver when issuing internal commands.
+ */
+ u16 *sector_buffer;
+ /*
+ * Pointer to the beginning of a sector buffer that is used
+ * by the DMA when the driver issues internal commands.
+ */
+ dma_addr_t sector_buffer_dma;
+ /*
+ * Bit significant, used to determine if a command slot has
+ * been allocated. i.e. the slot is in use. Bits are cleared
+ * when the command slot and all associated data structures
+ * are no longer needed.
+ */
+ unsigned long allocated[SLOTBITS_IN_LONGS];
+ /*
+ * used to queue commands when an internal command is in progress
+ * or error handling is active
+ */
+ unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
+ /*
+ * Array of command slots. Structure includes pointers to the
+ * command header and command table, and completion function and data
+ * pointers.
+ */
+ struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS];
+ /* Used by mtip_service_thread to wait for an event */
+ wait_queue_head_t svc_wait;
+ /*
+ * indicates the state of the port. Also, helps the service thread
+ * to determine its action on wake up.
+ */
+ unsigned long flags;
+ /*
+ * Timer used to complete commands that have been active for too long.
+ */
+ struct timer_list cmd_timer;
+ /*
+ * Semaphore used to block threads if there are no
+ * command slots available.
+ */
+ struct semaphore cmd_slot;
+ /* Spinlock for working around command-issue bug. */
+ spinlock_t cmd_issue_lock;
+};
+
+/*
+ * Driver private data structure.
+ *
+ * One structure is allocated per probed device.
+ */
+struct driver_data {
+ void __iomem *mmio; /* Base address of the HBA registers. */
+
+ int major; /* Major device number. */
+
+ int instance; /* Instance number. First device probed is 0, ... */
+
+ struct gendisk *disk; /* Pointer to our gendisk structure. */
+
+ struct pci_dev *pdev; /* Pointer to the PCI device structure. */
+
+ struct request_queue *queue; /* Our request queue. */
+
+ struct mtip_port *port; /* Pointer to the port data structure. */
+
+ /* Tasklet used to process the bottom half of the ISR. */
+ struct tasklet_struct tasklet;
+
+ unsigned product_type; /* magic value declaring the product type */
+
+ unsigned slot_groups; /* number of slot groups the product supports */
+
+ atomic_t drv_cleanup_done; /* Atomic variable for SRSI */
+
+ unsigned long index; /* Index to determine the disk name */
+
+ unsigned int ftlrebuildflag; /* FTL rebuild flag */
+
+ atomic_t resumeflag; /* Atomic variable to track suspend/resume */
+
+ atomic_t eh_active; /* Flag for error handling tracking */
+
+ struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
+};
+
+#endif
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 15ec4db194d..0088bf60f36 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -39,9 +39,6 @@
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/freezer.h>
-#include <linux/loop.h>
-#include <linux/falloc.h>
-#include <linux/fs.h>
#include <xen/events.h>
#include <xen/page.h>
@@ -362,7 +359,7 @@ static int xen_blkbk_map(struct blkif_request *req,
{
struct gnttab_map_grant_ref map[BLKIF_MAX_SEGMENTS_PER_REQUEST];
int i;
- int nseg = req->nr_segments;
+ int nseg = req->u.rw.nr_segments;
int ret = 0;
/*
@@ -416,30 +413,25 @@ static int xen_blkbk_map(struct blkif_request *req,
return ret;
}
-static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
+static int dispatch_discard_io(struct xen_blkif *blkif,
+ struct blkif_request *req)
{
int err = 0;
int status = BLKIF_RSP_OKAY;
struct block_device *bdev = blkif->vbd.bdev;
- if (blkif->blk_backend_type == BLKIF_BACKEND_PHY)
- /* just forward the discard request */
+ blkif->st_ds_req++;
+
+ xen_blkif_get(blkif);
+ if (blkif->blk_backend_type == BLKIF_BACKEND_PHY ||
+ blkif->blk_backend_type == BLKIF_BACKEND_FILE) {
+ unsigned long secure = (blkif->vbd.discard_secure &&
+ (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
+ BLKDEV_DISCARD_SECURE : 0;
err = blkdev_issue_discard(bdev,
req->u.discard.sector_number,
req->u.discard.nr_sectors,
- GFP_KERNEL, 0);
- else if (blkif->blk_backend_type == BLKIF_BACKEND_FILE) {
- /* punch a hole in the backing file */
- struct loop_device *lo = bdev->bd_disk->private_data;
- struct file *file = lo->lo_backing_file;
-
- if (file->f_op->fallocate)
- err = file->f_op->fallocate(file,
- FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
- req->u.discard.sector_number << 9,
- req->u.discard.nr_sectors << 9);
- else
- err = -EOPNOTSUPP;
+ GFP_KERNEL, secure);
} else
err = -EOPNOTSUPP;
@@ -449,7 +441,9 @@ static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req)
} else if (err)
status = BLKIF_RSP_ERROR;
- make_response(blkif, req->id, req->operation, status);
+ make_response(blkif, req->u.discard.id, req->operation, status);
+ xen_blkif_put(blkif);
+ return err;
}
static void xen_blk_drain_io(struct xen_blkif *blkif)
@@ -573,8 +567,11 @@ __do_block_io_op(struct xen_blkif *blkif)
/* Apply all sanity checks to /private copy/ of request. */
barrier();
-
- if (dispatch_rw_block_io(blkif, &req, pending_req))
+ if (unlikely(req.operation == BLKIF_OP_DISCARD)) {
+ free_req(pending_req);
+ if (dispatch_discard_io(blkif, &req))
+ break;
+ } else if (dispatch_rw_block_io(blkif, &req, pending_req))
break;
/* Yield point for this unbounded loop. */
@@ -633,10 +630,6 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
blkif->st_f_req++;
operation = WRITE_FLUSH;
break;
- case BLKIF_OP_DISCARD:
- blkif->st_ds_req++;
- operation = REQ_DISCARD;
- break;
default:
operation = 0; /* make gcc happy */
goto fail_response;
@@ -644,9 +637,9 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
}
/* Check that the number of segments is sane. */
- nseg = req->nr_segments;
- if (unlikely(nseg == 0 && operation != WRITE_FLUSH &&
- operation != REQ_DISCARD) ||
+ nseg = req->u.rw.nr_segments;
+
+ if (unlikely(nseg == 0 && operation != WRITE_FLUSH) ||
unlikely(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) {
pr_debug(DRV_PFX "Bad number of segments in request (%d)\n",
nseg);
@@ -654,12 +647,12 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
goto fail_response;
}
- preq.dev = req->handle;
+ preq.dev = req->u.rw.handle;
preq.sector_number = req->u.rw.sector_number;
preq.nr_sects = 0;
pending_req->blkif = blkif;
- pending_req->id = req->id;
+ pending_req->id = req->u.rw.id;
pending_req->operation = req->operation;
pending_req->status = BLKIF_RSP_OKAY;
pending_req->nr_pages = nseg;
@@ -707,7 +700,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
* the hypercall to unmap the grants - that is all done in
* xen_blkbk_unmap.
*/
- if (operation != REQ_DISCARD && xen_blkbk_map(req, pending_req, seg))
+ if (xen_blkbk_map(req, pending_req, seg))
goto fail_flush;
/*
@@ -739,23 +732,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
/* This will be hit if the operation was a flush or discard. */
if (!bio) {
- BUG_ON(operation != WRITE_FLUSH && operation != REQ_DISCARD);
+ BUG_ON(operation != WRITE_FLUSH);
- if (operation == WRITE_FLUSH) {
- bio = bio_alloc(GFP_KERNEL, 0);
- if (unlikely(bio == NULL))
- goto fail_put_bio;
+ bio = bio_alloc(GFP_KERNEL, 0);
+ if (unlikely(bio == NULL))
+ goto fail_put_bio;
- biolist[nbio++] = bio;
- bio->bi_bdev = preq.bdev;
- bio->bi_private = pending_req;
- bio->bi_end_io = end_block_io_op;
- } else if (operation == REQ_DISCARD) {
- xen_blk_discard(blkif, req);
- xen_blkif_put(blkif);
- free_req(pending_req);
- return 0;
- }
+ biolist[nbio++] = bio;
+ bio->bi_bdev = preq.bdev;
+ bio->bi_private = pending_req;
+ bio->bi_end_io = end_block_io_op;
}
/*
@@ -784,7 +770,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
xen_blkbk_unmap(pending_req);
fail_response:
/* Haven't submitted any bio's yet. */
- make_response(blkif, req->id, req->operation, BLKIF_RSP_ERROR);
+ make_response(blkif, req->u.rw.id, req->operation, BLKIF_RSP_ERROR);
free_req(pending_req);
msleep(1); /* back off a bit */
return -EIO;
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index dfb1b3a43a5..d0ee7edc9be 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -60,58 +60,66 @@ struct blkif_common_response {
char dummy;
};
-/* i386 protocol version */
-#pragma pack(push, 4)
-
struct blkif_x86_32_request_rw {
+ uint8_t nr_segments; /* number of segments */
+ blkif_vdev_t handle; /* only for read/write requests */
+ uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
-};
+} __attribute__((__packed__));
struct blkif_x86_32_request_discard {
+ uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */
+ blkif_vdev_t _pad1; /* was "handle" for read/write requests */
+ uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
- uint64_t nr_sectors;
-};
+ uint64_t nr_sectors;
+} __attribute__((__packed__));
struct blkif_x86_32_request {
uint8_t operation; /* BLKIF_OP_??? */
- uint8_t nr_segments; /* number of segments */
- blkif_vdev_t handle; /* only for read/write requests */
- uint64_t id; /* private guest value, echoed in resp */
union {
struct blkif_x86_32_request_rw rw;
struct blkif_x86_32_request_discard discard;
} u;
-};
+} __attribute__((__packed__));
+
+/* i386 protocol version */
+#pragma pack(push, 4)
struct blkif_x86_32_response {
uint64_t id; /* copied from request */
uint8_t operation; /* copied from request */
int16_t status; /* BLKIF_RSP_??? */
};
#pragma pack(pop)
-
/* x86_64 protocol version */
struct blkif_x86_64_request_rw {
+ uint8_t nr_segments; /* number of segments */
+ blkif_vdev_t handle; /* only for read/write requests */
+ uint32_t _pad1; /* offsetof(blkif_reqest..,u.rw.id)==8 */
+ uint64_t id;
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
-};
+} __attribute__((__packed__));
struct blkif_x86_64_request_discard {
+ uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */
+ blkif_vdev_t _pad1; /* was "handle" for read/write requests */
+ uint32_t _pad2; /* offsetof(blkif_..,u.discard.id)==8 */
+ uint64_t id;
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
- uint64_t nr_sectors;
-};
+ uint64_t nr_sectors;
+} __attribute__((__packed__));
struct blkif_x86_64_request {
uint8_t operation; /* BLKIF_OP_??? */
- uint8_t nr_segments; /* number of segments */
- blkif_vdev_t handle; /* only for read/write requests */
- uint64_t __attribute__((__aligned__(8))) id;
union {
struct blkif_x86_64_request_rw rw;
struct blkif_x86_64_request_discard discard;
} u;
-};
+} __attribute__((__packed__));
+
struct blkif_x86_64_response {
uint64_t __attribute__((__aligned__(8))) id;
uint8_t operation; /* copied from request */
@@ -156,6 +164,7 @@ struct xen_vbd {
/* Cached size parameter. */
sector_t size;
bool flush_support;
+ bool discard_secure;
};
struct backend_info;
@@ -237,22 +246,23 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst,
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
dst->operation = src->operation;
- dst->nr_segments = src->nr_segments;
- dst->handle = src->handle;
- dst->id = src->id;
switch (src->operation) {
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_FLUSH_DISKCACHE:
+ dst->u.rw.nr_segments = src->u.rw.nr_segments;
+ dst->u.rw.handle = src->u.rw.handle;
+ dst->u.rw.id = src->u.rw.id;
dst->u.rw.sector_number = src->u.rw.sector_number;
barrier();
- if (n > dst->nr_segments)
- n = dst->nr_segments;
+ if (n > dst->u.rw.nr_segments)
+ n = dst->u.rw.nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->u.rw.seg[i];
break;
case BLKIF_OP_DISCARD:
+ dst->u.discard.flag = src->u.discard.flag;
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
@@ -266,22 +276,23 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst,
{
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
dst->operation = src->operation;
- dst->nr_segments = src->nr_segments;
- dst->handle = src->handle;
- dst->id = src->id;
switch (src->operation) {
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
case BLKIF_OP_WRITE_BARRIER:
case BLKIF_OP_FLUSH_DISKCACHE:
+ dst->u.rw.nr_segments = src->u.rw.nr_segments;
+ dst->u.rw.handle = src->u.rw.handle;
+ dst->u.rw.id = src->u.rw.id;
dst->u.rw.sector_number = src->u.rw.sector_number;
barrier();
- if (n > dst->nr_segments)
- n = dst->nr_segments;
+ if (n > dst->u.rw.nr_segments)
+ n = dst->u.rw.nr_segments;
for (i = 0; i < n; i++)
dst->u.rw.seg[i] = src->u.rw.seg[i];
break;
case BLKIF_OP_DISCARD:
+ dst->u.discard.flag = src->u.discard.flag;
dst->u.discard.sector_number = src->u.discard.sector_number;
dst->u.discard.nr_sectors = src->u.discard.nr_sectors;
break;
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 37c794d3126..24a2fb57e5d 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -338,6 +338,9 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
if (q && q->flush_flags)
vbd->flush_support = true;
+ if (q && blk_queue_secdiscard(q))
+ vbd->discard_secure = true;
+
DPRINTK("Successful creation of handle=%04x (dom=%u)\n",
handle, blkif->domid);
return 0;
@@ -420,6 +423,15 @@ int xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be)
state = 1;
blkif->blk_backend_type = BLKIF_BACKEND_PHY;
}
+ /* Optional. */
+ err = xenbus_printf(xbt, dev->nodename,
+ "discard-secure", "%d",
+ blkif->vbd.discard_secure);
+ if (err) {
+ xenbus_dev_fatal(dev, err,
+ "writting discard-secure");
+ goto kfree;
+ }
}
} else {
err = PTR_ERR(type);
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 9fd3ee203b1..2f22874c0a3 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -98,7 +98,8 @@ struct blkfront_info
unsigned long shadow_free;
unsigned int feature_flush;
unsigned int flush_op;
- unsigned int feature_discard;
+ unsigned int feature_discard:1;
+ unsigned int feature_secdiscard:1;
unsigned int discard_granularity;
unsigned int discard_alignment;
int is_ready;
@@ -135,15 +136,15 @@ static int get_id_from_freelist(struct blkfront_info *info)
{
unsigned long free = info->shadow_free;
BUG_ON(free >= BLK_RING_SIZE);
- info->shadow_free = info->shadow[free].req.id;
- info->shadow[free].req.id = 0x0fffffee; /* debug */
+ info->shadow_free = info->shadow[free].req.u.rw.id;
+ info->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
return free;
}
static void add_id_to_freelist(struct blkfront_info *info,
unsigned long id)
{
- info->shadow[id].req.id = info->shadow_free;
+ info->shadow[id].req.u.rw.id = info->shadow_free;
info->shadow[id].request = NULL;
info->shadow_free = id;
}
@@ -156,7 +157,7 @@ static int xlbd_reserve_minors(unsigned int minor, unsigned int nr)
if (end > nr_minors) {
unsigned long *bitmap, *old;
- bitmap = kzalloc(BITS_TO_LONGS(end) * sizeof(*bitmap),
+ bitmap = kcalloc(BITS_TO_LONGS(end), sizeof(*bitmap),
GFP_KERNEL);
if (bitmap == NULL)
return -ENOMEM;
@@ -287,9 +288,9 @@ static int blkif_queue_request(struct request *req)
id = get_id_from_freelist(info);
info->shadow[id].request = req;
- ring_req->id = id;
+ ring_req->u.rw.id = id;
ring_req->u.rw.sector_number = (blkif_sector_t)blk_rq_pos(req);
- ring_req->handle = info->handle;
+ ring_req->u.rw.handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
BLKIF_OP_WRITE : BLKIF_OP_READ;
@@ -305,16 +306,21 @@ static int blkif_queue_request(struct request *req)
ring_req->operation = info->flush_op;
}
- if (unlikely(req->cmd_flags & REQ_DISCARD)) {
+ if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE))) {
/* id, sector_number and handle are set above. */
ring_req->operation = BLKIF_OP_DISCARD;
- ring_req->nr_segments = 0;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
+ if ((req->cmd_flags & REQ_SECURE) && info->feature_secdiscard)
+ ring_req->u.discard.flag = BLKIF_DISCARD_SECURE;
+ else
+ ring_req->u.discard.flag = 0;
} else {
- ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
- BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
+ ring_req->u.rw.nr_segments = blk_rq_map_sg(req->q, req,
+ info->sg);
+ BUG_ON(ring_req->u.rw.nr_segments >
+ BLKIF_MAX_SEGMENTS_PER_REQUEST);
- for_each_sg(info->sg, sg, ring_req->nr_segments, i) {
+ for_each_sg(info->sg, sg, ring_req->u.rw.nr_segments, i) {
buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
fsect = sg->offset >> 9;
lsect = fsect + (sg->length >> 9) - 1;
@@ -424,6 +430,8 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
blk_queue_max_discard_sectors(rq, get_capacity(gd));
rq->limits.discard_granularity = info->discard_granularity;
rq->limits.discard_alignment = info->discard_alignment;
+ if (info->feature_secdiscard)
+ queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, rq);
}
/* Hard sector size and max sectors impersonate the equiv. hardware. */
@@ -705,7 +713,9 @@ static void blkif_free(struct blkfront_info *info, int suspend)
static void blkif_completion(struct blk_shadow *s)
{
int i;
- for (i = 0; i < s->req.nr_segments; i++)
+ /* Do not let BLKIF_OP_DISCARD as nr_segment is in the same place
+ * flag. */
+ for (i = 0; i < s->req.u.rw.nr_segments; i++)
gnttab_end_foreign_access(s->req.u.rw.seg[i].gref, 0, 0UL);
}
@@ -736,7 +746,8 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
id = bret->id;
req = info->shadow[id].request;
- blkif_completion(&info->shadow[id]);
+ if (bret->operation != BLKIF_OP_DISCARD)
+ blkif_completion(&info->shadow[id]);
add_id_to_freelist(info, id);
@@ -749,7 +760,9 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
info->gd->disk_name);
error = -EOPNOTSUPP;
info->feature_discard = 0;
+ info->feature_secdiscard = 0;
queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
+ queue_flag_clear(QUEUE_FLAG_SECDISCARD, rq);
}
__blk_end_request_all(req, error);
break;
@@ -763,7 +776,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
error = -EOPNOTSUPP;
}
if (unlikely(bret->status == BLKIF_RSP_ERROR &&
- info->shadow[id].req.nr_segments == 0)) {
+ info->shadow[id].req.u.rw.nr_segments == 0)) {
printk(KERN_WARNING "blkfront: %s: empty write %s op failed\n",
info->flush_op == BLKIF_OP_WRITE_BARRIER ?
"barrier" : "flush disk cache",
@@ -984,8 +997,8 @@ static int blkfront_probe(struct xenbus_device *dev,
INIT_WORK(&info->work, blkif_restart_queue);
for (i = 0; i < BLK_RING_SIZE; i++)
- info->shadow[i].req.id = i+1;
- info->shadow[BLK_RING_SIZE-1].req.id = 0x0fffffff;
+ info->shadow[i].req.u.rw.id = i+1;
+ info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
/* Front end dir is a number, which is used as the id. */
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
@@ -1019,9 +1032,9 @@ static int blkif_recover(struct blkfront_info *info)
/* Stage 2: Set up free list. */
memset(&info->shadow, 0, sizeof(info->shadow));
for (i = 0; i < BLK_RING_SIZE; i++)
- info->shadow[i].req.id = i+1;
+ info->shadow[i].req.u.rw.id = i+1;
info->shadow_free = info->ring.req_prod_pvt;
- info->shadow[BLK_RING_SIZE-1].req.id = 0x0fffffff;
+ info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff;
/* Stage 3: Find pending requests and requeue them. */
for (i = 0; i < BLK_RING_SIZE; i++) {
@@ -1034,17 +1047,19 @@ static int blkif_recover(struct blkfront_info *info)
*req = copy[i].req;
/* We get a new request id, and must reset the shadow state. */
- req->id = get_id_from_freelist(info);
- memcpy(&info->shadow[req->id], &copy[i], sizeof(copy[i]));
+ req->u.rw.id = get_id_from_freelist(info);
+ memcpy(&info->shadow[req->u.rw.id], &copy[i], sizeof(copy[i]));
+ if (req->operation != BLKIF_OP_DISCARD) {
/* Rewrite any grant references invalidated by susp/resume. */
- for (j = 0; j < req->nr_segments; j++)
- gnttab_grant_foreign_access_ref(
- req->u.rw.seg[j].gref,
- info->xbdev->otherend_id,
- pfn_to_mfn(info->shadow[req->id].frame[j]),
- rq_data_dir(info->shadow[req->id].request));
- info->shadow[req->id].req = *req;
+ for (j = 0; j < req->u.rw.nr_segments; j++)
+ gnttab_grant_foreign_access_ref(
+ req->u.rw.seg[j].gref,
+ info->xbdev->otherend_id,
+ pfn_to_mfn(info->shadow[req->u.rw.id].frame[j]),
+ rq_data_dir(info->shadow[req->u.rw.id].request));
+ }
+ info->shadow[req->u.rw.id].req = *req;
info->ring.req_prod_pvt++;
}
@@ -1135,11 +1150,13 @@ static void blkfront_setup_discard(struct blkfront_info *info)
char *type;
unsigned int discard_granularity;
unsigned int discard_alignment;
+ unsigned int discard_secure;
type = xenbus_read(XBT_NIL, info->xbdev->otherend, "type", NULL);
if (IS_ERR(type))
return;
+ info->feature_secdiscard = 0;
if (strncmp(type, "phy", 3) == 0) {
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"discard-granularity", "%u", &discard_granularity,
@@ -1150,6 +1167,12 @@ static void blkfront_setup_discard(struct blkfront_info *info)
info->discard_granularity = discard_granularity;
info->discard_alignment = discard_alignment;
}
+ err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
+ "discard-secure", "%d", &discard_secure,
+ NULL);
+ if (!err)
+ info->feature_secdiscard = discard_secure;
+
} else if (strncmp(type, "file", 4) == 0)
info->feature_discard = 1;
diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h
index 9324488f23f..ee338bfde18 100644
--- a/include/xen/interface/io/blkif.h
+++ b/include/xen/interface/io/blkif.h
@@ -84,6 +84,21 @@ typedef uint64_t blkif_sector_t;
* e07154r6-Data_Set_Management_Proposal_for_ATA-ACS2.doc
* http://www.seagate.com/staticfiles/support/disc/manuals/
* Interface%20manuals/100293068c.pdf
+ * The backend can optionally provide three extra XenBus attributes to
+ * further optimize the discard functionality:
+ * 'discard-aligment' - Devices that support discard functionality may
+ * internally allocate space in units that are bigger than the exported
+ * logical block size. The discard-alignment parameter indicates how many bytes
+ * the beginning of the partition is offset from the internal allocation unit's
+ * natural alignment.
+ * 'discard-granularity' - Devices that support discard functionality may
+ * internally allocate space using units that are bigger than the logical block
+ * size. The discard-granularity parameter indicates the size of the internal
+ * allocation unit in bytes if reported by the device. Otherwise the
+ * discard-granularity will be set to match the device's physical block size.
+ * 'discard-secure' - All copies of the discarded sectors (potentially created
+ * by garbage collection) must also be erased. To use this feature, the flag
+ * BLKIF_DISCARD_SECURE must be set in the blkif_request_trim.
*/
#define BLKIF_OP_DISCARD 5
@@ -95,6 +110,12 @@ typedef uint64_t blkif_sector_t;
#define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
struct blkif_request_rw {
+ uint8_t nr_segments; /* number of segments */
+ blkif_vdev_t handle; /* only for read/write requests */
+#ifdef CONFIG_X86_64
+ uint32_t _pad1; /* offsetof(blkif_request,u.rw.id) == 8 */
+#endif
+ uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
struct blkif_request_segment {
grant_ref_t gref; /* reference to I/O buffer frame */
@@ -102,23 +123,28 @@ struct blkif_request_rw {
/* @last_sect: last sector in frame to transfer (inclusive). */
uint8_t first_sect, last_sect;
} seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
-};
+} __attribute__((__packed__));
struct blkif_request_discard {
+ uint8_t flag; /* BLKIF_DISCARD_SECURE or zero. */
+#define BLKIF_DISCARD_SECURE (1<<0) /* ignored if discard-secure=0 */
+ blkif_vdev_t _pad1; /* only for read/write requests */
+#ifdef CONFIG_X86_64
+ uint32_t _pad2; /* offsetof(blkif_req..,u.discard.id)==8*/
+#endif
+ uint64_t id; /* private guest value, echoed in resp */
blkif_sector_t sector_number;
- uint64_t nr_sectors;
-};
+ uint64_t nr_sectors;
+ uint8_t _pad3;
+} __attribute__((__packed__));
struct blkif_request {
uint8_t operation; /* BLKIF_OP_??? */
- uint8_t nr_segments; /* number of segments */
- blkif_vdev_t handle; /* only for read/write requests */
- uint64_t id; /* private guest value, echoed in resp */
union {
struct blkif_request_rw rw;
struct blkif_request_discard discard;
} u;
-};
+} __attribute__((__packed__));
struct blkif_response {
uint64_t id; /* copied from request */