Merge branch 'linux-2.6'

10 files changed, 140 insertions, 79 deletions

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 61381586895f..d6a732503ea6 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -113,7 +113,7 @@
 
 /* IOMMU sizing */
 #define IO_SEGMENT_SHIFT        28
-#define IO_PAGENO_BITS          (IO_SEGMENT_SHIFT - IOMMU_PAGE_SHIFT)
+#define IO_PAGENO_BITS(shift)   (IO_SEGMENT_SHIFT - (shift))
 
 /* The high bit needs to be set on every DMA address */
 #define SPIDER_DMA_OFFSET       0x80000000ul
@@ -123,7 +123,6 @@ struct iommu_window {
         struct cbe_iommu *iommu;
         unsigned long offset;
         unsigned long size;
-        unsigned long pte_offset;
         unsigned int ioid;
         struct iommu_table table;
 };
@@ -200,7 +199,7 @@ static void tce_build_cell(struct iommu_table *tbl, long index, long npages,
                 (window->ioid & IOPTE_IOID_Mask);
 #endif
 
-        io_pte = (unsigned long *)tbl->it_base + (index - window->pte_offset);
+        io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset);
 
         for (i = 0; i < npages; i++, uaddr += IOMMU_PAGE_SIZE)
                 io_pte[i] = base_pte | (__pa(uaddr) & IOPTE_RPN_Mask);
@@ -232,7 +231,7 @@ static void tce_free_cell(struct iommu_table *tbl, long index, long npages)
                 | (window->ioid & IOPTE_IOID_Mask);
 #endif
 
-        io_pte = (unsigned long *)tbl->it_base + (index - window->pte_offset);
+        io_pte = (unsigned long *)tbl->it_base + (index - tbl->it_offset);
 
         for (i = 0; i < npages; i++)
                 io_pte[i] = pte;
@@ -307,76 +306,84 @@ static int cell_iommu_find_ioc(int nid, unsigned long *base)
         return -ENODEV;
 }
 
-static void cell_iommu_setup_page_tables(struct cbe_iommu *iommu,
+static void cell_iommu_setup_stab(struct cbe_iommu *iommu,
                                 unsigned long dbase, unsigned long dsize,
                                 unsigned long fbase, unsigned long fsize)
 {
         struct page *page;
-        int i;
-        unsigned long reg, segments, pages_per_segment, ptab_size, stab_size,
-                      n_pte_pages, base;
-
-        base = dbase;
-        if (fsize != 0)
-                base = min(fbase, dbase);
+        unsigned long segments, stab_size;
 
         segments = max(dbase + dsize, fbase + fsize) >> IO_SEGMENT_SHIFT;
-        pages_per_segment = 1ull << IO_PAGENO_BITS;
 
-        pr_debug("%s: iommu[%d]: segments: %lu, pages per segment: %lu\n",
-                        __FUNCTION__, iommu->nid, segments, pages_per_segment);
+        pr_debug("%s: iommu[%d]: segments: %lu\n",
+                        __FUNCTION__, iommu->nid, segments);
 
         /* set up the segment table */
         stab_size = segments * sizeof(unsigned long);
         page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(stab_size));
         BUG_ON(!page);
         iommu->stab = page_address(page);
-        clear_page(iommu->stab);
+        memset(iommu->stab, 0, stab_size);
+}
+
+static unsigned long *cell_iommu_alloc_ptab(struct cbe_iommu *iommu,
+                unsigned long base, unsigned long size, unsigned long gap_base,
+                unsigned long gap_size, unsigned long page_shift)
+{
+        struct page *page;
+        int i;
+        unsigned long reg, segments, pages_per_segment, ptab_size,
+                      n_pte_pages, start_seg, *ptab;
+
+        start_seg = base >> IO_SEGMENT_SHIFT;
+        segments  = size >> IO_SEGMENT_SHIFT;
+        pages_per_segment = 1ull << IO_PAGENO_BITS(page_shift);
+        /* PTEs for each segment must start on a 4K bounday */
+        pages_per_segment = max(pages_per_segment,
+                                (1 << 12) / sizeof(unsigned long));
 
-        /* ... and the page tables. Since these are contiguous, we can treat
-         * the page tables as one array of ptes, like pSeries does.
-         */
         ptab_size = segments * pages_per_segment * sizeof(unsigned long);
         pr_debug("%s: iommu[%d]: ptab_size: %lu, order: %d\n", __FUNCTION__,
                         iommu->nid, ptab_size, get_order(ptab_size));
         page = alloc_pages_node(iommu->nid, GFP_KERNEL, get_order(ptab_size));
         BUG_ON(!page);
 
-        iommu->ptab = page_address(page);
-        memset(iommu->ptab, 0, ptab_size);
+        ptab = page_address(page);
+        memset(ptab, 0, ptab_size);
 
-        /* allocate a bogus page for the end of each mapping */
-        page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
-        BUG_ON(!page);
-        iommu->pad_page = page_address(page);
-        clear_page(iommu->pad_page);
-
-        /* number of pages needed for a page table */
-        n_pte_pages = (pages_per_segment *
-                       sizeof(unsigned long)) >> IOMMU_PAGE_SHIFT;
+        /* number of 4K pages needed for a page table */
+        n_pte_pages = (pages_per_segment * sizeof(unsigned long)) >> 12;
 
         pr_debug("%s: iommu[%d]: stab at %p, ptab at %p, n_pte_pages: %lu\n",
-                        __FUNCTION__, iommu->nid, iommu->stab, iommu->ptab,
+                        __FUNCTION__, iommu->nid, iommu->stab, ptab,
                         n_pte_pages);
 
         /* initialise the STEs */
         reg = IOSTE_V | ((n_pte_pages - 1) << 5);
 
-        if (IOMMU_PAGE_SIZE == 0x1000)
-                reg |= IOSTE_PS_4K;
-        else if (IOMMU_PAGE_SIZE == 0x10000)
-                reg |= IOSTE_PS_64K;
-        else {
-                extern void __unknown_page_size_error(void);
-                __unknown_page_size_error();
+        switch (page_shift) {
+        case 12: reg |= IOSTE_PS_4K;  break;
+        case 16: reg |= IOSTE_PS_64K; break;
+        case 20: reg |= IOSTE_PS_1M;  break;
+        case 24: reg |= IOSTE_PS_16M; break;
+        default: BUG();
         }
 
+        gap_base = gap_base >> IO_SEGMENT_SHIFT;
+        gap_size = gap_size >> IO_SEGMENT_SHIFT;
+
         pr_debug("Setting up IOMMU stab:\n");
-        for (i = base >> IO_SEGMENT_SHIFT; i < segments; i++) {
-                iommu->stab[i] = reg |
-                        (__pa(iommu->ptab) + n_pte_pages * IOMMU_PAGE_SIZE * i);
+        for (i = start_seg; i < (start_seg + segments); i++) {
+                if (i >= gap_base && i < (gap_base + gap_size)) {
+                        pr_debug("\toverlap at %d, skipping\n", i);
+                        continue;
+                }
+                iommu->stab[i] = reg | (__pa(ptab) + (n_pte_pages << 12) *
+                                        (i - start_seg));
                 pr_debug("\t[%d] 0x%016lx\n", i, iommu->stab[i]);
         }
+
+        return ptab;
 }
 
 static void cell_iommu_enable_hardware(struct cbe_iommu *iommu)
@@ -423,7 +430,9 @@ static void cell_iommu_enable_hardware(struct cbe_iommu *iommu)
 static void cell_iommu_setup_hardware(struct cbe_iommu *iommu,
         unsigned long base, unsigned long size)
 {
-        cell_iommu_setup_page_tables(iommu, base, size, 0, 0);
+        cell_iommu_setup_stab(iommu, base, size, 0, 0);
+        iommu->ptab = cell_iommu_alloc_ptab(iommu, base, size, 0, 0,
+                                            IOMMU_PAGE_SHIFT);
         cell_iommu_enable_hardware(iommu);
 }
 
@@ -464,6 +473,7 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
                         unsigned long pte_offset)
 {
         struct iommu_window *window;
+        struct page *page;
         u32 ioid;
 
         ioid = cell_iommu_get_ioid(np);
@@ -475,13 +485,11 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
         window->size = size;
         window->ioid = ioid;
         window->iommu = iommu;
-        window->pte_offset = pte_offset;
 
         window->table.it_blocksize = 16;
         window->table.it_base = (unsigned long)iommu->ptab;
         window->table.it_index = iommu->nid;
-        window->table.it_offset = (offset >> IOMMU_PAGE_SHIFT) +
-                window->pte_offset;
+        window->table.it_offset = (offset >> IOMMU_PAGE_SHIFT) + pte_offset;
         window->table.it_size = size >> IOMMU_PAGE_SHIFT;
 
         iommu_init_table(&window->table, iommu->nid);
@@ -504,6 +512,11 @@ cell_iommu_setup_window(struct cbe_iommu *iommu, struct device_node *np,
          * This code also assumes that we have a window that starts at 0,
          * which is the case on all spider based blades.
          */
+        page = alloc_pages_node(iommu->nid, GFP_KERNEL, 0);
+        BUG_ON(!page);
+        iommu->pad_page = page_address(page);
+        clear_page(iommu->pad_page);
+
         __set_bit(0, window->table.it_map);
         tce_build_cell(&window->table, window->table.it_offset, 1,
                        (unsigned long)iommu->pad_page, DMA_TO_DEVICE);
@@ -549,7 +562,7 @@ static void cell_dma_dev_setup_iommu(struct device *dev)
         archdata->dma_data = &window->table;
 }
 
-static void cell_dma_dev_setup_static(struct device *dev);
+static void cell_dma_dev_setup_fixed(struct device *dev);
 
 static void cell_dma_dev_setup(struct device *dev)
 {
@@ -557,7 +570,7 @@ static void cell_dma_dev_setup(struct device *dev)
 
         /* Order is important here, these are not mutually exclusive */
         if (get_dma_ops(dev) == &dma_iommu_fixed_ops)
-                cell_dma_dev_setup_static(dev);
+                cell_dma_dev_setup_fixed(dev);
         else if (get_pci_dma_ops() == &dma_iommu_ops)
                 cell_dma_dev_setup_iommu(dev);
         else if (get_pci_dma_ops() == &dma_direct_ops)
@@ -858,7 +871,7 @@ static int dma_set_mask_and_switch(struct device *dev, u64 dma_mask)
         return 0;
 }
 
-static void cell_dma_dev_setup_static(struct device *dev)
+static void cell_dma_dev_setup_fixed(struct device *dev)
 {
         struct dev_archdata *archdata = &dev->archdata;
         u64 addr;
@@ -869,35 +882,45 @@ static void cell_dma_dev_setup_static(struct device *dev)
         dev_dbg(dev, "iommu: fixed addr = %lx\n", addr);
 }
 
+static void insert_16M_pte(unsigned long addr, unsigned long *ptab,
+                           unsigned long base_pte)
+{
+        unsigned long segment, offset;
+
+        segment = addr >> IO_SEGMENT_SHIFT;
+        offset = (addr >> 24) - (segment << IO_PAGENO_BITS(24));
+        ptab = ptab + (segment * (1 << 12) / sizeof(unsigned long));
+
+        pr_debug("iommu: addr %lx ptab %p segment %lx offset %lx\n",
+                  addr, ptab, segment, offset);
+
+        ptab[offset] = base_pte | (__pa(addr) & IOPTE_RPN_Mask);
+}
+
 static void cell_iommu_setup_fixed_ptab(struct cbe_iommu *iommu,
         struct device_node *np, unsigned long dbase, unsigned long dsize,
         unsigned long fbase, unsigned long fsize)
 {
-        unsigned long base_pte, uaddr, *io_pte;
-        int i;
+        unsigned long base_pte, uaddr, ioaddr, *ptab;
 
-        dma_iommu_fixed_base = fbase;
+        ptab = cell_iommu_alloc_ptab(iommu, fbase, fsize, dbase, dsize, 24);
 
-        /* convert from bytes into page table indices */
-        dbase = dbase >> IOMMU_PAGE_SHIFT;
-        dsize = dsize >> IOMMU_PAGE_SHIFT;
-        fbase = fbase >> IOMMU_PAGE_SHIFT;
-        fsize = fsize >> IOMMU_PAGE_SHIFT;
+        dma_iommu_fixed_base = fbase;
 
         pr_debug("iommu: mapping 0x%lx pages from 0x%lx\n", fsize, fbase);
 
-        io_pte = iommu->ptab;
         base_pte = IOPTE_PP_W | IOPTE_PP_R | IOPTE_M | IOPTE_SO_RW
                     | (cell_iommu_get_ioid(np) & IOPTE_IOID_Mask);
 
-        uaddr = 0;
-        for (i = fbase; i < fbase + fsize; i++, uaddr += IOMMU_PAGE_SIZE) {
+        for (uaddr = 0; uaddr < fsize; uaddr += (1 << 24)) {
                 /* Don't touch the dynamic region */
-                if (i >= dbase && i < (dbase + dsize)) {
-                        pr_debug("iommu: static/dynamic overlap, skipping\n");
+                ioaddr = uaddr + fbase;
+                if (ioaddr >= dbase && ioaddr < (dbase + dsize)) {
+                        pr_debug("iommu: fixed/dynamic overlap, skipping\n");
                         continue;
                 }
-                io_pte[i] = base_pte | (__pa(uaddr) & IOPTE_RPN_Mask);
+
+                insert_16M_pte(uaddr, ptab, base_pte);
         }
 
         mb();
@@ -995,7 +1018,9 @@ static int __init cell_iommu_fixed_mapping_init(void)
                         "fixed window 0x%lx-0x%lx\n", iommu->nid, dbase,
                          dbase + dsize, fbase, fbase + fsize);
 
-                cell_iommu_setup_page_tables(iommu, dbase, dsize, fbase, fsize);
+                cell_iommu_setup_stab(iommu, dbase, dsize, fbase, fsize);
+                iommu->ptab = cell_iommu_alloc_ptab(iommu, dbase, dsize, 0, 0,
+                                                    IOMMU_PAGE_SHIFT);
                 cell_iommu_setup_fixed_ptab(iommu, np, dbase, dsize,
                                              fbase, fsize);
                 cell_iommu_enable_hardware(iommu);
diff --git a/arch/powerpc/platforms/cell/setup.c b/arch/powerpc/platforms/cell/setup.c
index a7f609b3b876..dda34650cb07 100644
--- a/arch/powerpc/platforms/cell/setup.c
+++ b/arch/powerpc/platforms/cell/setup.c
@@ -149,6 +149,11 @@ static void __init cell_init_irq(void)
         mpic_init_IRQ();
 }
 
+static void __init cell_set_dabrx(void)
+{
+        mtspr(SPRN_DABRX, DABRX_KERNEL | DABRX_USER);
+}
+
 static void __init cell_setup_arch(void)
 {
 #ifdef CONFIG_SPU_BASE
@@ -158,6 +163,8 @@ static void __init cell_setup_arch(void)
 
         cbe_regs_init();
 
+        cell_set_dabrx();
+
 #ifdef CONFIG_CBE_RAS
         cbe_ras_init();
 #endif
diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index 87eb07f94c5f..712001f6b7da 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -81,9 +81,12 @@ struct spu_slb {
 void spu_invalidate_slbs(struct spu *spu)
 {
         struct spu_priv2 __iomem *priv2 = spu->priv2;
+        unsigned long flags;
 
+        spin_lock_irqsave(&spu->register_lock, flags);
         if (spu_mfc_sr1_get(spu) & MFC_STATE1_RELOCATE_MASK)
                 out_be64(&priv2->slb_invalidate_all_W, 0UL);
+        spin_unlock_irqrestore(&spu->register_lock, flags);
 }
 EXPORT_SYMBOL_GPL(spu_invalidate_slbs);
 
@@ -148,7 +151,11 @@ static inline void spu_load_slb(struct spu *spu, int slbe, struct spu_slb *slb)
                         __func__, slbe, slb->vsid, slb->esid);
 
         out_be64(&priv2->slb_index_W, slbe);
+        /* set invalid before writing vsid */
+        out_be64(&priv2->slb_esid_RW, 0);
+        /* now it's safe to write the vsid */
         out_be64(&priv2->slb_vsid_RW, slb->vsid);
+        /* setting the new esid makes the entry valid again */
         out_be64(&priv2->slb_esid_RW, slb->esid);
 }
 
@@ -290,9 +297,11 @@ void spu_setup_kernel_slbs(struct spu *spu, struct spu_lscsa *lscsa,
                 nr_slbs++;
         }
 
+        spin_lock_irq(&spu->register_lock);
         /* Add the set of SLBs */
         for (i = 0; i < nr_slbs; i++)
                 spu_load_slb(spu, i, &slbs[i]);
+        spin_unlock_irq(&spu->register_lock);
 }
 EXPORT_SYMBOL_GPL(spu_setup_kernel_slbs);
 
@@ -337,13 +346,14 @@ spu_irq_class_1(int irq, void *data)
         if (stat & CLASS1_STORAGE_FAULT_INTR)
                 spu_mfc_dsisr_set(spu, 0ul);
         spu_int_stat_clear(spu, 1, stat);
-        spin_unlock(&spu->register_lock);
-        pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat,
-                        dar, dsisr);
 
         if (stat & CLASS1_SEGMENT_FAULT_INTR)
                 __spu_trap_data_seg(spu, dar);
 
+        spin_unlock(&spu->register_lock);
+        pr_debug("%s: %lx %lx %lx %lx\n", __FUNCTION__, mask, stat,
+                        dar, dsisr);
+
         if (stat & CLASS1_STORAGE_FAULT_INTR)
                 __spu_trap_data_map(spu, dar, dsisr);
 
diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index 133995ed5cc7..0ad83aeb70b1 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -109,13 +109,12 @@ void spu_forget(struct spu_context *ctx)
 
         /*
          * This is basically an open-coded spu_acquire_saved, except that
-         * we don't acquire the state mutex interruptible.
+         * we don't acquire the state mutex interruptible, and we don't
+         * want this context to be rescheduled on release.
          */
         mutex_lock(&ctx->state_mutex);
-        if (ctx->state != SPU_STATE_SAVED) {
-                set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags);
+        if (ctx->state != SPU_STATE_SAVED)
                 spu_deactivate(ctx);
-        }
 
         mm = ctx->owner;
         ctx->owner = NULL;
@@ -171,7 +170,8 @@ void spu_release_saved(struct spu_context *ctx)
 {
         BUG_ON(ctx->state != SPU_STATE_SAVED);
 
-        if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags))
+        if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) &&
+                        test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
                 spu_activate(ctx, 0);
 
         spu_release(ctx);
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index c66c3756970d..f7a7e8635fb6 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -367,6 +367,13 @@ static unsigned long spufs_ps_nopfn(struct vm_area_struct *vma,
                 return NOPFN_SIGBUS;
 
         /*
+         * Because we release the mmap_sem, the context may be destroyed while
+         * we're in spu_wait. Grab an extra reference so it isn't destroyed
+         * in the meantime.
+         */
+        get_spu_context(ctx);
+
+        /*
          * We have to wait for context to be loaded before we have
          * pages to hand out to the user, but we don't want to wait
          * with the mmap_sem held.
@@ -375,7 +382,7 @@ static unsigned long spufs_ps_nopfn(struct vm_area_struct *vma,
          * hanged.
          */
         if (spu_acquire(ctx))
-                return NOPFN_REFAULT;
+                goto refault;
 
         if (ctx->state == SPU_STATE_SAVED) {
                 up_read(&current->mm->mmap_sem);
@@ -391,6 +398,9 @@ static unsigned long spufs_ps_nopfn(struct vm_area_struct *vma,
 
         if (!ret)
                 spu_release(ctx);
+
+refault:
+        put_spu_context(ctx);
         return NOPFN_REFAULT;
 }
 
diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
index 6221968c2a3c..cac69e116776 100644
--- a/arch/powerpc/platforms/cell/spufs/run.c
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -220,6 +220,7 @@ static int spu_run_init(struct spu_context *ctx, u32 *npc)
                 }
         }
 
+        set_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags);
         return 0;
 }
 
@@ -234,7 +235,7 @@ static int spu_run_fini(struct spu_context *ctx, u32 *npc,
         *npc = ctx->ops->npc_read(ctx);
 
         spuctx_switch_state(ctx, SPU_UTIL_IDLE_LOADED);
-        ctx->policy = SCHED_IDLE;
+        clear_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags);
         spu_release(ctx);
 
         if (signal_pending(current))
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 3a5972117de7..00528ef84ad2 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -246,7 +246,7 @@ static void spu_bind_context(struct spu *spu, struct spu_context *ctx)
         spu_switch_notify(spu, ctx);
         ctx->state = SPU_STATE_RUNNABLE;
 
-        spuctx_switch_state(ctx, SPU_UTIL_IDLE_LOADED);
+        spuctx_switch_state(ctx, SPU_UTIL_USER);
 }
 
 /*
@@ -867,7 +867,7 @@ static noinline void spusched_tick(struct spu_context *ctx)
         if (ctx->policy == SCHED_FIFO)
                 goto out;
 
-        if (--ctx->time_slice && ctx->policy != SCHED_IDLE)
+        if (--ctx->time_slice && test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
                 goto out;
 
         spu = ctx->spu;
@@ -877,7 +877,7 @@ static noinline void spusched_tick(struct spu_context *ctx)
         new = grab_runnable_context(ctx->prio + 1, spu->node);
         if (new) {
                 spu_unschedule(spu, ctx);
-                if (ctx->policy != SCHED_IDLE)
+                if (test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags))
                         spu_add_to_rq(ctx);
         } else {
                 spu_context_nospu_trace(spusched_tick__newslice, ctx);
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index 2c2fe3c07d72..cdc515182f82 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -44,6 +44,7 @@ struct spu_gang;
 enum {
         SPU_SCHED_NOTIFY_ACTIVE,
         SPU_SCHED_WAS_ACTIVE,   /* was active upon spu_acquire_saved()  */
+        SPU_SCHED_SPU_RUN,      /* context is within spu_run */
 };
 
 struct spu_context {
diff --git a/arch/powerpc/platforms/cell/spufs/sputrace.c b/arch/powerpc/platforms/cell/spufs/sputrace.c
index 01974f7776e1..79aa773f3c99 100644
--- a/arch/powerpc/platforms/cell/spufs/sputrace.c
+++ b/arch/powerpc/platforms/cell/spufs/sputrace.c
@@ -58,12 +58,12 @@ static int sputrace_sprint(char *tbuf, int n)
                 ktime_to_timespec(ktime_sub(t->tstamp, sputrace_start));
 
         return snprintf(tbuf, n,
-                "[%lu.%09lu] %d: %s (thread = %d, spu = %d)\n",
+                "[%lu.%09lu] %d: %s (ctxthread = %d, spu = %d)\n",
                 (unsigned long) tv.tv_sec,
                 (unsigned long) tv.tv_nsec,
-                t->owner_tid,
-                t->name,
                 t->curr_tid,
+                t->name,
+                t->owner_tid,
                 t->number);
 }
 
@@ -188,6 +188,7 @@ struct spu_probe spu_probes[] = {
         { "spufs_ps_nopfn__insert", "%p %p", spu_context_event },
         { "spu_acquire_saved__enter", "%p", spu_context_nospu_event },
         { "destroy_spu_context__enter", "%p", spu_context_nospu_event },
+        { "spufs_stop_callback__enter", "%p %p", spu_context_event },
 };
 
 static int __init sputrace_init(void)
diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index 6f5886c7b1f9..e9dc7a55d1b9 100644
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -34,6 +34,7 @@
 
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/hardirq.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
@@ -117,6 +118,8 @@ static inline void disable_interrupts(struct spu_state *csa, struct spu *spu)
          *     Write INT_MASK_class1 with value of 0.
          *     Save INT_Mask_class2 in CSA.
          *     Write INT_MASK_class2 with value of 0.
+         *     Synchronize all three interrupts to be sure
+         *     we no longer execute a handler on another CPU.
          */
         spin_lock_irq(&spu->register_lock);
         if (csa) {
@@ -129,6 +132,9 @@ static inline void disable_interrupts(struct spu_state *csa, struct spu *spu)
         spu_int_mask_set(spu, 2, 0ul);
         eieio();
         spin_unlock_irq(&spu->register_lock);
+        synchronize_irq(spu->irqs[0]);
+        synchronize_irq(spu->irqs[1]);
+        synchronize_irq(spu->irqs[2]);
 }
 
 static inline void set_watchdog_timer(struct spu_state *csa, struct spu *spu)