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authorLuke Browning <lukebr@linux.vnet.ibm.com>2008-04-28 17:35:56 +1000
committerJeremy Kerr <jk@ozlabs.org>2008-05-05 13:33:44 +1000
commitde1028927ae3487e2e450dacf50fbf32042aee18 (patch)
tree615b7c5fa3526ccf11b63be88c8978180df0bee8
parentf3d69e0507f84903059d456c5d19f10b2df3ac69 (diff)
[POWERPC] spufs: handle faults while the context switch pending flag is set
Currently, page fault handlers don't issue a mfc restart if the context switch pending flag is set, which can leave us with a hanging DMA after a context restore. This patch introduces fault pending flag that is set by the fault handler and read by the context switch code, so that the latter can add the restart bit at the right spot, after it has successfuly saved the state of the mfc control register. Signed-off-by: Luke Browning <lukebr@linux.vnet.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
-rw-r--r--arch/powerpc/platforms/cell/spu_base.c4
-rw-r--r--arch/powerpc/platforms/cell/spufs/switch.c23
-rw-r--r--include/asm-powerpc/spu.h1
3 files changed, 19 insertions, 9 deletions
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index b9ae675640d..70c660121ec 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -141,6 +141,10 @@ static void spu_restart_dma(struct spu *spu)
if (!test_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags))
out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
+ else {
+ set_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags);
+ mb();
+ }
}
static inline void spu_load_slb(struct spu *spu, int slbe, struct spu_slb *slb)
diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index 47c658051fc..3df9a36eb2f 100644
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -139,6 +139,7 @@ static inline void disable_interrupts(struct spu_state *csa, struct spu *spu)
* via a simple load.
*/
set_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags);
+ clear_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags);
synchronize_irq(spu->irqs[0]);
synchronize_irq(spu->irqs[1]);
synchronize_irq(spu->irqs[2]);
@@ -739,10 +740,14 @@ static inline void set_switch_active(struct spu_state *csa, struct spu *spu)
/* Save, Step 48:
* Restore, Step 23.
* Change the software context switch pending flag
- * to context switch active.
+ * to context switch active. This implementation does
+ * not uses a switch active flag.
*
- * This implementation does not uses a switch active flag.
+ * Now that we have saved the mfc in the csa, we can add in the
+ * restart command if an exception occurred.
*/
+ if (test_bit(SPU_CONTEXT_FAULT_PENDING, &spu->flags))
+ csa->priv2.mfc_control_RW |= MFC_CNTL_RESTART_DMA_COMMAND;
clear_bit(SPU_CONTEXT_SWITCH_PENDING, &spu->flags);
mb();
}
@@ -1742,15 +1747,15 @@ static inline void restore_mfc_cntl(struct spu_state *csa, struct spu *spu)
*/
out_be64(&priv2->mfc_control_RW, csa->priv2.mfc_control_RW);
eieio();
+
/*
- * FIXME: this is to restart a DMA that we were processing
- * before the save. better remember the fault information
- * in the csa instead.
+ * The queue is put back into the same state that was evident prior to
+ * the context switch. The suspend flag is added to the saved state in
+ * the csa, if the operational state was suspending or suspended. In
+ * this case, the code that suspended the mfc is responsible for
+ * continuing it. Note that SPE faults do not change the operational
+ * state of the spu.
*/
- if ((csa->priv2.mfc_control_RW & MFC_CNTL_SUSPEND_DMA_QUEUE_MASK)) {
- out_be64(&priv2->mfc_control_RW, MFC_CNTL_RESTART_DMA_COMMAND);
- eieio();
- }
}
static inline void enable_user_access(struct spu_state *csa, struct spu *spu)
diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index 882aa953968..6abead6e681 100644
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -100,6 +100,7 @@
/* Flag indicating progress during context switch. */
#define SPU_CONTEXT_SWITCH_PENDING 0UL
+#define SPU_CONTEXT_FAULT_PENDING 1UL
struct spu_context;
struct spu_runqueue;