isci: remove 'min memory' infrastructure

The old 'core' had aspirations of running in severely memory constrained
environments like bios option-rom, it's not needed for Linux and gets in
the way of other cleanups (like unifying/reducing the number of structure
members in scic_sds_controller/isci_host).

This also fixes a theoretical bug in that the driver would blindly override
the silicon advertised limits for number of ports, task contexts, and remote
node contexts.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 11 insertions, 79 deletions

diff --git a/drivers/scsi/isci/isci.h b/drivers/scsi/isci/isci.h
index 80cfb45f8da..714ed926171 100644
--- a/drivers/scsi/isci/isci.h
+++ b/drivers/scsi/isci/isci.h
@@ -78,39 +78,16 @@ enum sci_controller_mode {
 	SCI_MODE_SIZE /* deprecated */
 };
 
-#define SCI_MAX_PHYS  (4)
+#define SCI_MAX_PHYS  (4UL)
 #define SCI_MAX_PORTS SCI_MAX_PHYS
-#define SCI_MIN_SMP_PHYS  (38)
 #define SCI_MAX_SMP_PHYS  (384) /* not silicon constrained */
-#define SCI_MAX_REMOTE_DEVICES (256)
-#define SCI_MIN_REMOTE_DEVICES (16)
-#define SCI_MAX_IO_REQUESTS (256)
-#define SCI_MIN_IO_REQUESTS (1)
+#define SCI_MAX_REMOTE_DEVICES (256UL)
+#define SCI_MAX_IO_REQUESTS (256UL)
 #define SCI_MAX_MSIX_MESSAGES  (2)
 #define SCI_MAX_SCATTER_GATHER_ELEMENTS 130 /* not silicon constrained */
-#define SCI_MIN_SCATTER_GATHER_ELEMENTS 1
 #define SCI_MAX_CONTROLLERS 2
 #define SCI_MAX_DOMAINS  SCI_MAX_PORTS
 
-/* 2 indicates the maximum number of UFs that can occur for a given IO request.
- * The hardware handles reception of additional unsolicited frames while all
- * UFs are in use, by holding off the transmitting device.  This number could
- * be theoretically reduced to 1, but 2 provides for more reliable operation.
- * During SATA PIO operation, it is possible under some conditions for there to
- * be 3 separate FISes received, back to back to back (PIO Setup, Data, D2H
- * Register). It is unlikely to have all 3 pending all at once without some of
- * them already being processed.
- */
-#define SCU_MIN_UNSOLICITED_FRAMES        (1)
-#define SCU_MIN_CRITICAL_NOTIFICATIONS    (24)
-#define SCU_MIN_EVENTS                    (4)
-#define SCU_MIN_COMPLETION_QUEUE_SCRATCH  (2)
-#define SCU_MIN_COMPLETION_QUEUE_ENTRIES  (SCU_MIN_CRITICAL_NOTIFICATIONS \
-					   + SCU_MIN_EVENTS \
-					   + SCU_MIN_UNSOLICITED_FRAMES	\
-					   + SCI_MIN_IO_REQUESTS \
-					   + SCU_MIN_COMPLETION_QUEUE_SCRATCH)
-
 #define SCU_MAX_CRITICAL_NOTIFICATIONS    (384)
 #define SCU_MAX_EVENTS                    (128)
 #define SCU_MAX_UNSOLICITED_FRAMES        (128)
@@ -121,51 +98,6 @@ enum sci_controller_mode {
 					   + SCI_MAX_IO_REQUESTS \
 					   + SCU_MAX_COMPLETION_QUEUE_SCRATCH)
 
-#if !defined(ENABLE_MINIMUM_MEMORY_MODE)
-#define SCU_UNSOLICITED_FRAME_COUNT      SCU_MAX_UNSOLICITED_FRAMES
-#define SCU_CRITICAL_NOTIFICATION_COUNT  SCU_MAX_CRITICAL_NOTIFICATIONS
-#define SCU_EVENT_COUNT                  SCU_MAX_EVENTS
-#define SCU_COMPLETION_QUEUE_SCRATCH     SCU_MAX_COMPLETION_QUEUE_SCRATCH
-#define SCU_IO_REQUEST_COUNT             SCI_MAX_IO_REQUESTS
-#define SCU_IO_REQUEST_SGE_COUNT         SCI_MAX_SCATTER_GATHER_ELEMENTS
-#define SCU_COMPLETION_QUEUE_COUNT       SCU_MAX_COMPLETION_QUEUE_ENTRIES
-#else
-#define SCU_UNSOLICITED_FRAME_COUNT      SCU_MIN_UNSOLICITED_FRAMES
-#define SCU_CRITICAL_NOTIFICATION_COUNT  SCU_MIN_CRITICAL_NOTIFICATIONS
-#define SCU_EVENT_COUNT                  SCU_MIN_EVENTS
-#define SCU_COMPLETION_QUEUE_SCRATCH     SCU_MIN_COMPLETION_QUEUE_SCRATCH
-#define SCU_IO_REQUEST_COUNT             SCI_MIN_IO_REQUESTS
-#define SCU_IO_REQUEST_SGE_COUNT         SCI_MIN_SCATTER_GATHER_ELEMENTS
-#define SCU_COMPLETION_QUEUE_COUNT       SCU_MIN_COMPLETION_QUEUE_ENTRIES
-#endif /* !defined(ENABLE_MINIMUM_MEMORY_OPERATION) */
-
-/**
- *
- *
- * The SCU_COMPLETION_QUEUE_COUNT constant indicates the size of the completion
- * queue into which the hardware DMAs 32-bit quantas (completion entries).
- */
-
-/**
- *
- *
- * This queue must be programmed to a power of 2 size (e.g. 32, 64, 1024, etc.).
- */
-#if (SCU_COMPLETION_QUEUE_COUNT != 16)  && \
-	(SCU_COMPLETION_QUEUE_COUNT != 32)  && \
-	(SCU_COMPLETION_QUEUE_COUNT != 64)  && \
-	(SCU_COMPLETION_QUEUE_COUNT != 128) && \
-	(SCU_COMPLETION_QUEUE_COUNT != 256) && \
-	(SCU_COMPLETION_QUEUE_COUNT != 512) && \
-	(SCU_COMPLETION_QUEUE_COUNT != 1024)
-#error "SCU_COMPLETION_QUEUE_COUNT must be set to a power of 2."
-#endif
-
-#if SCU_MIN_UNSOLICITED_FRAMES > SCU_MAX_UNSOLICITED_FRAMES
-#error "Invalid configuration of unsolicited frame constants"
-#endif /* SCU_MIN_UNSOLICITED_FRAMES > SCU_MAX_UNSOLICITED_FRAMES */
-
-#define SCU_MIN_UF_TABLE_ENTRIES            (8)
 #define SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES (4096)
 #define SCU_UNSOLICITED_FRAME_BUFFER_SIZE   (1024)
 #define SCU_INVALID_FRAME_INDEX             (0xFFFF)
@@ -173,14 +105,14 @@ enum sci_controller_mode {
 #define SCU_IO_REQUEST_MAX_SGE_SIZE         (0x00FFFFFF)
 #define SCU_IO_REQUEST_MAX_TRANSFER_LENGTH  (0x00FFFFFF)
 
-/*
- * Determine the size of the unsolicited frame array including
- * unused buffers. */
-#if SCU_UNSOLICITED_FRAME_COUNT <= SCU_MIN_UF_TABLE_ENTRIES
-#define SCU_UNSOLICITED_FRAME_CONTROL_ARRAY_SIZE SCU_MIN_UF_TABLE_ENTRIES
-#else
-#define SCU_UNSOLICITED_FRAME_CONTROL_ARRAY_SIZE SCU_MAX_UNSOLICITED_FRAMES
-#endif /* SCU_UNSOLICITED_FRAME_COUNT <= SCU_MIN_UF_TABLE_ENTRIES */
+static inline void check_sizes(void)
+{
+	BUILD_BUG_ON_NOT_POWER_OF_2(SCU_MAX_EVENTS);
+	BUILD_BUG_ON(SCU_MAX_UNSOLICITED_FRAMES <= 8);
+	BUILD_BUG_ON_NOT_POWER_OF_2(SCU_MAX_UNSOLICITED_FRAMES);
+	BUILD_BUG_ON_NOT_POWER_OF_2(SCU_MAX_COMPLETION_QUEUE_ENTRIES);
+	BUILD_BUG_ON(SCU_MAX_UNSOLICITED_FRAMES > SCU_ABSOLUTE_MAX_UNSOLICITED_FRAMES);
+}
 
 /**
  * enum sci_status - This is the general return status enumeration for non-IO,