powerpc/spufs: remove class_0_dsisr from spu exception handling

According to the CBEA, the SPU dsisr is not updated for class 0
exceptions.

spu_stopped() is testing the dsisr that was passed to it from the class
0 exception handler, so we return a false positive here.

This patch cleans up the interrupt handler and erroneous tests in
spu_stopped. It also removes the fields from the csa since it is not
needed to process class 0 events.

Signed-off-by: Luke Browning <lukebrowning@us.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

5 files changed, 1 insertions, 10 deletions

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 70c660121ec4..96b5f0f1c11e 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -324,14 +324,12 @@ spu_irq_class_0(int irq, void *data)
         stat = spu_int_stat_get(spu, 0) & mask;
 
         spu->class_0_pending |= stat;
-        spu->class_0_dsisr = spu_mfc_dsisr_get(spu);
         spu->class_0_dar = spu_mfc_dar_get(spu);
         spin_unlock(&spu->register_lock);
 
         spu->stop_callback(spu, 0);
 
         spu->class_0_pending = 0;
-        spu->class_0_dsisr = 0;
         spu->class_0_dar = 0;
 
         spu_int_stat_clear(spu, 0, stat);
diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
index 0046bcfe495a..f7edba6cb795 100644
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -27,7 +27,6 @@ void spufs_stop_callback(struct spu *spu, int irq)
                 switch(irq) {
                 case 0 :
                         ctx->csa.class_0_pending = spu->class_0_pending;
-                        ctx->csa.class_0_dsisr = spu->class_0_dsisr;
                         ctx->csa.class_0_dar = spu->class_0_dar;
                         break;
                 case 1 :
@@ -69,10 +68,6 @@ top:
         if (test_bit(SPU_SCHED_NOTIFY_ACTIVE, &ctx->sched_flags))
                 return 1;
 
-        dsisr = ctx->csa.class_0_dsisr;
-        if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED))
-                return 1;
-
         dsisr = ctx->csa.class_1_dsisr;
         if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED))
                 return 1;
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 1702de9395ee..bfcf70ee8959 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2844,7 +2844,6 @@ static void dump_spu_fields(struct spu *spu)
         DUMP_FIELD(spu, "0x%lx", flags);
         DUMP_FIELD(spu, "%d", class_0_pending);
         DUMP_FIELD(spu, "0x%lx", class_0_dar);
-        DUMP_FIELD(spu, "0x%lx", class_0_dsisr);
         DUMP_FIELD(spu, "0x%lx", class_1_dar);
         DUMP_FIELD(spu, "0x%lx", class_1_dsisr);
         DUMP_FIELD(spu, "0x%lx", irqs[0]);
diff --git a/include/asm-powerpc/spu.h b/include/asm-powerpc/spu.h
index 6abead6e681a..99348c1f4cab 100644
--- a/include/asm-powerpc/spu.h
+++ b/include/asm-powerpc/spu.h
@@ -131,7 +131,6 @@ struct spu {
         u64 flags;
         u64 class_0_pending;
         u64 class_0_dar;
-        u64 class_0_dsisr;
         u64 class_1_dar;
         u64 class_1_dsisr;
         size_t ls_size;
diff --git a/include/asm-powerpc/spu_csa.h b/include/asm-powerpc/spu_csa.h
index 129ec148d451..a40fd491250c 100644
--- a/include/asm-powerpc/spu_csa.h
+++ b/include/asm-powerpc/spu_csa.h
@@ -254,7 +254,7 @@ struct spu_state {
         u64 spu_chnldata_RW[32];
         u32 spu_mailbox_data[4];
         u32 pu_mailbox_data[1];
-        u64 class_0_dar, class_0_dsisr, class_0_pending;
+        u64 class_0_dar, class_0_pending;
         u64 class_1_dar, class_1_dsisr;
         unsigned long suspend_time;
         spinlock_t register_lock;