Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

9 files changed, 215 insertions, 392 deletions

diff --git a/arch/sparc64/kernel/pci_iommu.c b/arch/sparc64/kernel/pci_iommu.c
index 425c60cfea19..a11910be1013 100644
--- a/arch/sparc64/kernel/pci_iommu.c
+++ b/arch/sparc64/kernel/pci_iommu.c
@@ -49,12 +49,6 @@ static void __iommu_flushall(struct pci_iommu *iommu)
 
         /* Ensure completion of previous PIO writes. */
         (void) pci_iommu_read(iommu->write_complete_reg);
-
-        /* Now update everyone's flush point. */
-        for (entry = 0; entry < PBM_NCLUSTERS; entry++) {
-                iommu->alloc_info[entry].flush =
-                        iommu->alloc_info[entry].next;
-        }
 }
 
 #define IOPTE_CONSISTENT(CTX) \
@@ -80,120 +74,117 @@ static void inline iopte_make_dummy(struct pci_iommu *iommu, iopte_t *iopte)
         iopte_val(*iopte) = val;
 }
 
-void pci_iommu_table_init(struct pci_iommu *iommu, int tsbsize)
+/* Based largely upon the ppc64 iommu allocator.  */
+static long pci_arena_alloc(struct pci_iommu *iommu, unsigned long npages)
 {
-        int i;
-
-        tsbsize /= sizeof(iopte_t);
-
-        for (i = 0; i < tsbsize; i++)
-                iopte_make_dummy(iommu, &iommu->page_table[i]);
-}
-
-static iopte_t *alloc_streaming_cluster(struct pci_iommu *iommu, unsigned long npages)
-{
-        iopte_t *iopte, *limit, *first;
-        unsigned long cnum, ent, flush_point;
-
-        cnum = 0;
-        while ((1UL << cnum) < npages)
-                cnum++;
-        iopte  = (iommu->page_table +
-                  (cnum << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
-
-        if (cnum == 0)
-                limit = (iommu->page_table +
-                         iommu->lowest_consistent_map);
-        else
-                limit = (iopte +
-                         (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
-
-        iopte += ((ent = iommu->alloc_info[cnum].next) << cnum);
-        flush_point = iommu->alloc_info[cnum].flush;
-        
-        first = iopte;
-        for (;;) {
-                if (IOPTE_IS_DUMMY(iommu, iopte)) {
-                        if ((iopte + (1 << cnum)) >= limit)
-                                ent = 0;
-                        else
-                                ent = ent + 1;
-                        iommu->alloc_info[cnum].next = ent;
-                        if (ent == flush_point)
-                                __iommu_flushall(iommu);
-                        break;
+        struct pci_iommu_arena *arena = &iommu->arena;
+        unsigned long n, i, start, end, limit;
+        int pass;
+
+        limit = arena->limit;
+        start = arena->hint;
+        pass = 0;
+
+again:
+        n = find_next_zero_bit(arena->map, limit, start);
+        end = n + npages;
+        if (unlikely(end >= limit)) {
+                if (likely(pass < 1)) {
+                        limit = start;
+                        start = 0;
+                        __iommu_flushall(iommu);
+                        pass++;
+                        goto again;
+                } else {
+                        /* Scanned the whole thing, give up. */
+                        return -1;
                 }
-                iopte += (1 << cnum);
-                ent++;
-                if (iopte >= limit) {
-                        iopte = (iommu->page_table +
-                                 (cnum <<
-                                  (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
-                        ent = 0;
+        }
+
+        for (i = n; i < end; i++) {
+                if (test_bit(i, arena->map)) {
+                        start = i + 1;
+                        goto again;
                 }
-                if (ent == flush_point)
-                        __iommu_flushall(iommu);
-                if (iopte == first)
-                        goto bad;
         }
 
-        /* I've got your streaming cluster right here buddy boy... */
-        return iopte;
+        for (i = n; i < end; i++)
+                __set_bit(i, arena->map);
 
-bad:
-        printk(KERN_EMERG "pci_iommu: alloc_streaming_cluster of npages(%ld) failed!\n",
-               npages);
-        return NULL;
+        arena->hint = end;
+
+        return n;
 }
 
-static void free_streaming_cluster(struct pci_iommu *iommu, dma_addr_t base,
-                                   unsigned long npages, unsigned long ctx)
+static void pci_arena_free(struct pci_iommu_arena *arena, unsigned long base, unsigned long npages)
 {
-        unsigned long cnum, ent;
+        unsigned long i;
 
-        cnum = 0;
-        while ((1UL << cnum) < npages)
-                cnum++;
+        for (i = base; i < (base + npages); i++)
+                __clear_bit(i, arena->map);
+}
 
-        ent = (base << (32 - IO_PAGE_SHIFT + PBM_LOGCLUSTERS - iommu->page_table_sz_bits))
-                >> (32 + PBM_LOGCLUSTERS + cnum - iommu->page_table_sz_bits);
+void pci_iommu_table_init(struct pci_iommu *iommu, int tsbsize, u32 dma_offset, u32 dma_addr_mask)
+{
+        unsigned long i, tsbbase, order, sz, num_tsb_entries;
+
+        num_tsb_entries = tsbsize / sizeof(iopte_t);
+
+        /* Setup initial software IOMMU state. */
+        spin_lock_init(&iommu->lock);
+        iommu->ctx_lowest_free = 1;
+        iommu->page_table_map_base = dma_offset;
+        iommu->dma_addr_mask = dma_addr_mask;
+
+        /* Allocate and initialize the free area map.  */
+        sz = num_tsb_entries / 8;
+        sz = (sz + 7UL) & ~7UL;
+        iommu->arena.map = kmalloc(sz, GFP_KERNEL);
+        if (!iommu->arena.map) {
+                prom_printf("PCI_IOMMU: Error, kmalloc(arena.map) failed.\n");
+                prom_halt();
+        }
+        memset(iommu->arena.map, 0, sz);
+        iommu->arena.limit = num_tsb_entries;
 
-        /* If the global flush might not have caught this entry,
-         * adjust the flush point such that we will flush before
-         * ever trying to reuse it.
+        /* Allocate and initialize the dummy page which we
+         * set inactive IO PTEs to point to.
          */
-#define between(X,Y,Z)  (((Z) - (Y)) >= ((X) - (Y)))
-        if (between(ent, iommu->alloc_info[cnum].next, iommu->alloc_info[cnum].flush))
-                iommu->alloc_info[cnum].flush = ent;
-#undef between
+        iommu->dummy_page = __get_free_pages(GFP_KERNEL, 0);
+        if (!iommu->dummy_page) {
+                prom_printf("PCI_IOMMU: Error, gfp(dummy_page) failed.\n");
+                prom_halt();
+        }
+        memset((void *)iommu->dummy_page, 0, PAGE_SIZE);
+        iommu->dummy_page_pa = (unsigned long) __pa(iommu->dummy_page);
+
+        /* Now allocate and setup the IOMMU page table itself.  */
+        order = get_order(tsbsize);
+        tsbbase = __get_free_pages(GFP_KERNEL, order);
+        if (!tsbbase) {
+                prom_printf("PCI_IOMMU: Error, gfp(tsb) failed.\n");
+                prom_halt();
+        }
+        iommu->page_table = (iopte_t *)tsbbase;
+
+        for (i = 0; i < num_tsb_entries; i++)
+                iopte_make_dummy(iommu, &iommu->page_table[i]);
 }
 
-/* We allocate consistent mappings from the end of cluster zero. */
-static iopte_t *alloc_consistent_cluster(struct pci_iommu *iommu, unsigned long npages)
+static inline iopte_t *alloc_npages(struct pci_iommu *iommu, unsigned long npages)
 {
-        iopte_t *iopte;
+        long entry;
 
-        iopte = iommu->page_table + (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS));
-        while (iopte > iommu->page_table) {
-                iopte--;
-                if (IOPTE_IS_DUMMY(iommu, iopte)) {
-                        unsigned long tmp = npages;
+        entry = pci_arena_alloc(iommu, npages);
+        if (unlikely(entry < 0))
+                return NULL;
 
-                        while (--tmp) {
-                                iopte--;
-                                if (!IOPTE_IS_DUMMY(iommu, iopte))
-                                        break;
-                        }
-                        if (tmp == 0) {
-                                u32 entry = (iopte - iommu->page_table);
+        return iommu->page_table + entry;
+}
 
-                                if (entry < iommu->lowest_consistent_map)
-                                        iommu->lowest_consistent_map = entry;
-                                return iopte;
-                        }
-                }
-        }
-        return NULL;
+static inline void free_npages(struct pci_iommu *iommu, dma_addr_t base, unsigned long npages)
+{
+        pci_arena_free(&iommu->arena, base >> IO_PAGE_SHIFT, npages);
 }
 
 static int iommu_alloc_ctx(struct pci_iommu *iommu)
@@ -233,7 +224,7 @@ void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_ad
         struct pcidev_cookie *pcp;
         struct pci_iommu *iommu;
         iopte_t *iopte;
-        unsigned long flags, order, first_page, ctx;
+        unsigned long flags, order, first_page;
         void *ret;
         int npages;
 
@@ -251,9 +242,10 @@ void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_ad
         iommu = pcp->pbm->iommu;
 
         spin_lock_irqsave(&iommu->lock, flags);
-        iopte = alloc_consistent_cluster(iommu, size >> IO_PAGE_SHIFT);
-        if (iopte == NULL) {
-                spin_unlock_irqrestore(&iommu->lock, flags);
+        iopte = alloc_npages(iommu, size >> IO_PAGE_SHIFT);
+        spin_unlock_irqrestore(&iommu->lock, flags);
+
+        if (unlikely(iopte == NULL)) {
                 free_pages(first_page, order);
                 return NULL;
         }
@@ -262,31 +254,15 @@ void *pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_ad
                       ((iopte - iommu->page_table) << IO_PAGE_SHIFT));
         ret = (void *) first_page;
         npages = size >> IO_PAGE_SHIFT;
-        ctx = 0;
-        if (iommu->iommu_ctxflush)
-                ctx = iommu_alloc_ctx(iommu);
         first_page = __pa(first_page);
         while (npages--) {
-                iopte_val(*iopte) = (IOPTE_CONSISTENT(ctx) |
+                iopte_val(*iopte) = (IOPTE_CONSISTENT(0UL) |
                                      IOPTE_WRITE |
                                      (first_page & IOPTE_PAGE));
                 iopte++;
                 first_page += IO_PAGE_SIZE;
         }
 
-        {
-                int i;
-                u32 daddr = *dma_addrp;
-
-                npages = size >> IO_PAGE_SHIFT;
-                for (i = 0; i < npages; i++) {
-                        pci_iommu_write(iommu->iommu_flush, daddr);
-                        daddr += IO_PAGE_SIZE;
-                }
-        }
-
-        spin_unlock_irqrestore(&iommu->lock, flags);
-
         return ret;
 }
 
@@ -296,7 +272,7 @@ void pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu, dma_addr_
         struct pcidev_cookie *pcp;
         struct pci_iommu *iommu;
         iopte_t *iopte;
-        unsigned long flags, order, npages, i, ctx;
+        unsigned long flags, order, npages;
 
         npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
         pcp = pdev->sysdata;
@@ -306,46 +282,7 @@ void pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu, dma_addr_
 
         spin_lock_irqsave(&iommu->lock, flags);
 
-        if ((iopte - iommu->page_table) ==
-            iommu->lowest_consistent_map) {
-                iopte_t *walk = iopte + npages;
-                iopte_t *limit;
-
-                limit = (iommu->page_table +
-                         (1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS)));
-                while (walk < limit) {
-                        if (!IOPTE_IS_DUMMY(iommu, walk))
-                                break;
-                        walk++;
-                }
-                iommu->lowest_consistent_map =
-                        (walk - iommu->page_table);
-        }
-
-        /* Data for consistent mappings cannot enter the streaming
-         * buffers, so we only need to update the TSB.  We flush
-         * the IOMMU here as well to prevent conflicts with the
-         * streaming mapping deferred tlb flush scheme.
-         */
-
-        ctx = 0;
-        if (iommu->iommu_ctxflush)
-                ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
-
-        for (i = 0; i < npages; i++, iopte++)
-                iopte_make_dummy(iommu, iopte);
-
-        if (iommu->iommu_ctxflush) {
-                pci_iommu_write(iommu->iommu_ctxflush, ctx);
-        } else {
-                for (i = 0; i < npages; i++) {
-                        u32 daddr = dvma + (i << IO_PAGE_SHIFT);
-
-                        pci_iommu_write(iommu->iommu_flush, daddr);
-                }
-        }
-
-        iommu_free_ctx(iommu, ctx);
+        free_npages(iommu, dvma, npages);
 
         spin_unlock_irqrestore(&iommu->lock, flags);
 
@@ -372,25 +309,27 @@ dma_addr_t pci_map_single(struct pci_dev *pdev, void *ptr, size_t sz, int direct
         iommu = pcp->pbm->iommu;
         strbuf = &pcp->pbm->stc;
 
-        if (direction == PCI_DMA_NONE)
-                BUG();
+        if (unlikely(direction == PCI_DMA_NONE))
+                goto bad_no_ctx;
 
         oaddr = (unsigned long)ptr;
         npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
         npages >>= IO_PAGE_SHIFT;
 
         spin_lock_irqsave(&iommu->lock, flags);
+        base = alloc_npages(iommu, npages);
+        ctx = 0;
+        if (iommu->iommu_ctxflush)
+                ctx = iommu_alloc_ctx(iommu);
+        spin_unlock_irqrestore(&iommu->lock, flags);
 
-        base = alloc_streaming_cluster(iommu, npages);
-        if (base == NULL)
+        if (unlikely(!base))
                 goto bad;
+
         bus_addr = (iommu->page_table_map_base +
                     ((base - iommu->page_table) << IO_PAGE_SHIFT));
         ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
         base_paddr = __pa(oaddr & IO_PAGE_MASK);
-        ctx = 0;
-        if (iommu->iommu_ctxflush)
-                ctx = iommu_alloc_ctx(iommu);
         if (strbuf->strbuf_enabled)
                 iopte_protection = IOPTE_STREAMING(ctx);
         else
@@ -401,12 +340,13 @@ dma_addr_t pci_map_single(struct pci_dev *pdev, void *ptr, size_t sz, int direct
         for (i = 0; i < npages; i++, base++, base_paddr += IO_PAGE_SIZE)
                 iopte_val(*base) = iopte_protection | base_paddr;
 
-        spin_unlock_irqrestore(&iommu->lock, flags);
-
         return ret;
 
 bad:
-        spin_unlock_irqrestore(&iommu->lock, flags);
+        iommu_free_ctx(iommu, ctx);
+bad_no_ctx:
+        if (printk_ratelimit())
+                WARN_ON(1);
         return PCI_DMA_ERROR_CODE;
 }
 
@@ -481,10 +421,13 @@ void pci_unmap_single(struct pci_dev *pdev, dma_addr_t bus_addr, size_t sz, int
         struct pci_iommu *iommu;
         struct pci_strbuf *strbuf;
         iopte_t *base;
-        unsigned long flags, npages, ctx;
+        unsigned long flags, npages, ctx, i;
 
-        if (direction == PCI_DMA_NONE)
-                BUG();
+        if (unlikely(direction == PCI_DMA_NONE)) {
+                if (printk_ratelimit())
+                        WARN_ON(1);
+                return;
+        }
 
         pcp = pdev->sysdata;
         iommu = pcp->pbm->iommu;
@@ -510,13 +453,14 @@ void pci_unmap_single(struct pci_dev *pdev, dma_addr_t bus_addr, size_t sz, int
 
         /* Step 1: Kick data out of streaming buffers if necessary. */
         if (strbuf->strbuf_enabled)
-                pci_strbuf_flush(strbuf, iommu, bus_addr, ctx, npages, direction);
+                pci_strbuf_flush(strbuf, iommu, bus_addr, ctx,
+                                 npages, direction);
 
-        /* Step 2: Clear out first TSB entry. */
-        iopte_make_dummy(iommu, base);
+        /* Step 2: Clear out TSB entries. */
+        for (i = 0; i < npages; i++)
+                iopte_make_dummy(iommu, base + i);
 
-        free_streaming_cluster(iommu, bus_addr - iommu->page_table_map_base,
-                               npages, ctx);
+        free_npages(iommu, bus_addr - iommu->page_table_map_base, npages);
 
         iommu_free_ctx(iommu, ctx);
 
@@ -621,6 +565,8 @@ int pci_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int
                         pci_map_single(pdev,
                                        (page_address(sglist->page) + sglist->offset),
                                        sglist->length, direction);
+                if (unlikely(sglist->dma_address == PCI_DMA_ERROR_CODE))
+                        return 0;
                 sglist->dma_length = sglist->length;
                 return 1;
         }
@@ -629,21 +575,29 @@ int pci_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int
         iommu = pcp->pbm->iommu;
         strbuf = &pcp->pbm->stc;
         
-        if (direction == PCI_DMA_NONE)
-                BUG();
+        if (unlikely(direction == PCI_DMA_NONE))
+                goto bad_no_ctx;
 
         /* Step 1: Prepare scatter list. */
 
         npages = prepare_sg(sglist, nelems);
 
-        /* Step 2: Allocate a cluster. */
+        /* Step 2: Allocate a cluster and context, if necessary. */
 
         spin_lock_irqsave(&iommu->lock, flags);
 
-        base = alloc_streaming_cluster(iommu, npages);
+        base = alloc_npages(iommu, npages);
+        ctx = 0;
+        if (iommu->iommu_ctxflush)
+                ctx = iommu_alloc_ctx(iommu);
+
+        spin_unlock_irqrestore(&iommu->lock, flags);
+
         if (base == NULL)
                 goto bad;
-        dma_base = iommu->page_table_map_base + ((base - iommu->page_table) << IO_PAGE_SHIFT);
+
+        dma_base = iommu->page_table_map_base +
+                ((base - iommu->page_table) << IO_PAGE_SHIFT);
 
         /* Step 3: Normalize DMA addresses. */
         used = nelems;
@@ -656,30 +610,28 @@ int pci_map_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems, int
         }
         used = nelems - used;
 
-        /* Step 4: Choose a context if necessary. */
-        ctx = 0;
-        if (iommu->iommu_ctxflush)
-                ctx = iommu_alloc_ctx(iommu);
-
-        /* Step 5: Create the mappings. */
+        /* Step 4: Create the mappings. */
         if (strbuf->strbuf_enabled)
                 iopte_protection = IOPTE_STREAMING(ctx);
         else
                 iopte_protection = IOPTE_CONSISTENT(ctx);
         if (direction != PCI_DMA_TODEVICE)
                 iopte_protection |= IOPTE_WRITE;
-        fill_sg (base, sglist, used, nelems, iopte_protection);
+
+        fill_sg(base, sglist, used, nelems, iopte_protection);
+
 #ifdef VERIFY_SG
         verify_sglist(sglist, nelems, base, npages);
 #endif
 
-        spin_unlock_irqrestore(&iommu->lock, flags);
-
         return used;
 
 bad:
-        spin_unlock_irqrestore(&iommu->lock, flags);
-        return PCI_DMA_ERROR_CODE;
+        iommu_free_ctx(iommu, ctx);
+bad_no_ctx:
+        if (printk_ratelimit())
+                WARN_ON(1);
+        return 0;
 }
 
 /* Unmap a set of streaming mode DMA translations. */
@@ -692,8 +644,10 @@ void pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems,
         unsigned long flags, ctx, i, npages;
         u32 bus_addr;
 
-        if (direction == PCI_DMA_NONE)
-                BUG();
+        if (unlikely(direction == PCI_DMA_NONE)) {
+                if (printk_ratelimit())
+                        WARN_ON(1);
+        }
 
         pcp = pdev->sysdata;
         iommu = pcp->pbm->iommu;
@@ -705,7 +659,8 @@ void pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems,
                 if (sglist[i].dma_length == 0)
                         break;
         i--;
-        npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) - bus_addr) >> IO_PAGE_SHIFT;
+        npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+                  bus_addr) >> IO_PAGE_SHIFT;
 
         base = iommu->page_table +
                 ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
@@ -726,11 +681,11 @@ void pci_unmap_sg(struct pci_dev *pdev, struct scatterlist *sglist, int nelems,
         if (strbuf->strbuf_enabled)
                 pci_strbuf_flush(strbuf, iommu, bus_addr, ctx, npages, direction);
 
-        /* Step 2: Clear out first TSB entry. */
-        iopte_make_dummy(iommu, base);
+        /* Step 2: Clear out the TSB entries. */
+        for (i = 0; i < npages; i++)
+                iopte_make_dummy(iommu, base + i);
 
-        free_streaming_cluster(iommu, bus_addr - iommu->page_table_map_base,
-                               npages, ctx);
+        free_npages(iommu, bus_addr - iommu->page_table_map_base, npages);
 
         iommu_free_ctx(iommu, ctx);
 
diff --git a/arch/sparc64/kernel/pci_psycho.c b/arch/sparc64/kernel/pci_psycho.c
index 6ed1ef25e0ac..c03ed5f49d31 100644
--- a/arch/sparc64/kernel/pci_psycho.c
+++ b/arch/sparc64/kernel/pci_psycho.c
@@ -1207,13 +1207,9 @@ static void psycho_scan_bus(struct pci_controller_info *p)
 static void psycho_iommu_init(struct pci_controller_info *p)
 {
         struct pci_iommu *iommu = p->pbm_A.iommu;
-        unsigned long tsbbase, i;
+        unsigned long i;
         u64 control;
 
-        /* Setup initial software IOMMU state. */
-        spin_lock_init(&iommu->lock);
-        iommu->ctx_lowest_free = 1;
-
         /* Register addresses. */
         iommu->iommu_control  = p->pbm_A.controller_regs + PSYCHO_IOMMU_CONTROL;
         iommu->iommu_tsbbase  = p->pbm_A.controller_regs + PSYCHO_IOMMU_TSBBASE;
@@ -1240,40 +1236,10 @@ static void psycho_iommu_init(struct pci_controller_info *p)
         /* Leave diag mode enabled for full-flushing done
          * in pci_iommu.c
          */
+        pci_iommu_table_init(iommu, IO_TSB_SIZE, 0xc0000000, 0xffffffff);
 
-        iommu->dummy_page = __get_free_pages(GFP_KERNEL, 0);
-        if (!iommu->dummy_page) {
-                prom_printf("PSYCHO_IOMMU: Error, gfp(dummy_page) failed.\n");
-                prom_halt();
-        }
-        memset((void *)iommu->dummy_page, 0, PAGE_SIZE);
-        iommu->dummy_page_pa = (unsigned long) __pa(iommu->dummy_page);
-
-        /* Using assumed page size 8K with 128K entries we need 1MB iommu page
-         * table (128K ioptes * 8 bytes per iopte).  This is
-         * page order 7 on UltraSparc.
-         */
-        tsbbase = __get_free_pages(GFP_KERNEL, get_order(IO_TSB_SIZE));
-        if (!tsbbase) {
-                prom_printf("PSYCHO_IOMMU: Error, gfp(tsb) failed.\n");
-                prom_halt();
-        }
-        iommu->page_table = (iopte_t *)tsbbase;
-        iommu->page_table_sz_bits = 17;
-        iommu->page_table_map_base = 0xc0000000;
-        iommu->dma_addr_mask = 0xffffffff;
-        pci_iommu_table_init(iommu, IO_TSB_SIZE);
-
-        /* We start with no consistent mappings. */
-        iommu->lowest_consistent_map =
-                1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS);
-
-        for (i = 0; i < PBM_NCLUSTERS; i++) {
-                iommu->alloc_info[i].flush = 0;
-                iommu->alloc_info[i].next = 0;
-        }
-
-        psycho_write(p->pbm_A.controller_regs + PSYCHO_IOMMU_TSBBASE, __pa(tsbbase));
+        psycho_write(p->pbm_A.controller_regs + PSYCHO_IOMMU_TSBBASE,
+                     __pa(iommu->page_table));
 
         control = psycho_read(p->pbm_A.controller_regs + PSYCHO_IOMMU_CONTROL);
         control &= ~(PSYCHO_IOMMU_CTRL_TSBSZ | PSYCHO_IOMMU_CTRL_TBWSZ);
@@ -1281,7 +1247,7 @@ static void psycho_iommu_init(struct pci_controller_info *p)
         psycho_write(p->pbm_A.controller_regs + PSYCHO_IOMMU_CONTROL, control);
 
         /* If necessary, hook us up for starfire IRQ translations. */
-        if(this_is_starfire)
+        if (this_is_starfire)
                 p->starfire_cookie = starfire_hookup(p->pbm_A.portid);
         else
                 p->starfire_cookie = NULL;
diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index 0ee6bd5b9ac6..da8e1364194f 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -1267,13 +1267,9 @@ static void sabre_iommu_init(struct pci_controller_info *p,
                              u32 dma_mask)
 {
         struct pci_iommu *iommu = p->pbm_A.iommu;
-        unsigned long tsbbase, i, order;
+        unsigned long i;
         u64 control;
 
-        /* Setup initial software IOMMU state. */
-        spin_lock_init(&iommu->lock);
-        iommu->ctx_lowest_free = 1;
-
         /* Register addresses. */
         iommu->iommu_control  = p->pbm_A.controller_regs + SABRE_IOMMU_CONTROL;
         iommu->iommu_tsbbase  = p->pbm_A.controller_regs + SABRE_IOMMU_TSBBASE;
@@ -1295,26 +1291,10 @@ static void sabre_iommu_init(struct pci_controller_info *p,
         /* Leave diag mode enabled for full-flushing done
          * in pci_iommu.c
          */
+        pci_iommu_table_init(iommu, tsbsize * 1024 * 8, dvma_offset, dma_mask);
 
-        iommu->dummy_page = __get_free_pages(GFP_KERNEL, 0);
-        if (!iommu->dummy_page) {
-                prom_printf("PSYCHO_IOMMU: Error, gfp(dummy_page) failed.\n");
-                prom_halt();
-        }
-        memset((void *)iommu->dummy_page, 0, PAGE_SIZE);
-        iommu->dummy_page_pa = (unsigned long) __pa(iommu->dummy_page);
-
-        tsbbase = __get_free_pages(GFP_KERNEL, order = get_order(tsbsize * 1024 * 8));
-        if (!tsbbase) {
-                prom_printf("SABRE_IOMMU: Error, gfp(tsb) failed.\n");
-                prom_halt();
-        }
-        iommu->page_table = (iopte_t *)tsbbase;
-        iommu->page_table_map_base = dvma_offset;
-        iommu->dma_addr_mask = dma_mask;
-        pci_iommu_table_init(iommu, PAGE_SIZE << order);
-
-        sabre_write(p->pbm_A.controller_regs + SABRE_IOMMU_TSBBASE, __pa(tsbbase));
+        sabre_write(p->pbm_A.controller_regs + SABRE_IOMMU_TSBBASE,
+                    __pa(iommu->page_table));
 
         control = sabre_read(p->pbm_A.controller_regs + SABRE_IOMMU_CONTROL);
         control &= ~(SABRE_IOMMUCTRL_TSBSZ | SABRE_IOMMUCTRL_TBWSZ);
@@ -1322,11 +1302,9 @@ static void sabre_iommu_init(struct pci_controller_info *p,
         switch(tsbsize) {
         case 64:
                 control |= SABRE_IOMMU_TSBSZ_64K;
-                iommu->page_table_sz_bits = 16;
                 break;
         case 128:
                 control |= SABRE_IOMMU_TSBSZ_128K;
-                iommu->page_table_sz_bits = 17;
                 break;
         default:
                 prom_printf("iommu_init: Illegal TSB size %d\n", tsbsize);
@@ -1334,15 +1312,6 @@ static void sabre_iommu_init(struct pci_controller_info *p,
                 break;
         }
         sabre_write(p->pbm_A.controller_regs + SABRE_IOMMU_CONTROL, control);
-
-        /* We start with no consistent mappings. */
-        iommu->lowest_consistent_map =
-                1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS);
-
-        for (i = 0; i < PBM_NCLUSTERS; i++) {
-                iommu->alloc_info[i].flush = 0;
-                iommu->alloc_info[i].next = 0;
-        }
 }
 
 static void pbm_register_toplevel_resources(struct pci_controller_info *p,
diff --git a/arch/sparc64/kernel/pci_schizo.c b/arch/sparc64/kernel/pci_schizo.c
index cae5b61fe2f0..d8c4e0919b4e 100644
--- a/arch/sparc64/kernel/pci_schizo.c
+++ b/arch/sparc64/kernel/pci_schizo.c
@@ -1765,7 +1765,7 @@ static void schizo_pbm_strbuf_init(struct pci_pbm_info *pbm)
 static void schizo_pbm_iommu_init(struct pci_pbm_info *pbm)
 {
         struct pci_iommu *iommu = pbm->iommu;
-        unsigned long tsbbase, i, tagbase, database, order;
+        unsigned long i, tagbase, database;
         u32 vdma[2], dma_mask;
         u64 control;
         int err, tsbsize;
@@ -1800,10 +1800,6 @@ static void schizo_pbm_iommu_init(struct pci_pbm_info *pbm)
                         prom_halt();
         };
 
-        /* Setup initial software IOMMU state. */
-        spin_lock_init(&iommu->lock);
-        iommu->ctx_lowest_free = 1;
-
         /* Register addresses, SCHIZO has iommu ctx flushing. */
         iommu->iommu_control  = pbm->pbm_regs + SCHIZO_IOMMU_CONTROL;
         iommu->iommu_tsbbase  = pbm->pbm_regs + SCHIZO_IOMMU_TSBBASE;
@@ -1832,56 +1828,9 @@ static void schizo_pbm_iommu_init(struct pci_pbm_info *pbm)
         /* Leave diag mode enabled for full-flushing done
          * in pci_iommu.c
          */
+        pci_iommu_table_init(iommu, tsbsize * 8 * 1024, vdma[0], dma_mask);
 
-        iommu->dummy_page = __get_free_pages(GFP_KERNEL, 0);
-        if (!iommu->dummy_page) {
-                prom_printf("PSYCHO_IOMMU: Error, gfp(dummy_page) failed.\n");
-                prom_halt();
-        }
-        memset((void *)iommu->dummy_page, 0, PAGE_SIZE);
-        iommu->dummy_page_pa = (unsigned long) __pa(iommu->dummy_page);
-
-        /* Using assumed page size 8K with 128K entries we need 1MB iommu page
-         * table (128K ioptes * 8 bytes per iopte).  This is
-         * page order 7 on UltraSparc.
-         */
-        order = get_order(tsbsize * 8 * 1024);
-        tsbbase = __get_free_pages(GFP_KERNEL, order);
-        if (!tsbbase) {
-                prom_printf("%s: Error, gfp(tsb) failed.\n", pbm->name);
-                prom_halt();
-        }
-
-        iommu->page_table = (iopte_t *)tsbbase;
-        iommu->page_table_map_base = vdma[0];
-        iommu->dma_addr_mask = dma_mask;
-        pci_iommu_table_init(iommu, PAGE_SIZE << order);
-
-        switch (tsbsize) {
-        case 64:
-                iommu->page_table_sz_bits = 16;
-                break;
-
-        case 128:
-                iommu->page_table_sz_bits = 17;
-                break;
-
-        default:
-                prom_printf("iommu_init: Illegal TSB size %d\n", tsbsize);
-                prom_halt();
-                break;
-        };
-
-        /* We start with no consistent mappings. */
-        iommu->lowest_consistent_map =
-                1 << (iommu->page_table_sz_bits - PBM_LOGCLUSTERS);
-
-        for (i = 0; i < PBM_NCLUSTERS; i++) {
-                iommu->alloc_info[i].flush = 0;
-                iommu->alloc_info[i].next = 0;
-        }
-
-        schizo_write(iommu->iommu_tsbbase, __pa(tsbbase));
+        schizo_write(iommu->iommu_tsbbase, __pa(iommu->page_table));
 
         control = schizo_read(iommu->iommu_control);
         control &= ~(SCHIZO_IOMMU_CTRL_TSBSZ | SCHIZO_IOMMU_CTRL_TBWSZ);
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 590df5a16f5a..b137fd63f5e1 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1001,13 +1001,6 @@ void smp_penguin_jailcell(int irq, struct pt_regs *regs)
         preempt_enable();
 }
 
-extern unsigned long xcall_promstop;
-
-void smp_promstop_others(void)
-{
-        smp_cross_call(&xcall_promstop, 0, 0, 0);
-}
-
 #define prof_multiplier(__cpu)          cpu_data(__cpu).multiplier
 #define prof_counter(__cpu)             cpu_data(__cpu).counter
 
diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S
index 058b8126c1a7..e4c9151fa116 100644
--- a/arch/sparc64/mm/ultra.S
+++ b/arch/sparc64/mm/ultra.S
@@ -453,22 +453,6 @@ xcall_flush_dcache_page_spitfire: /* %g1 == physical page address
         nop
         nop
 
-        .globl          xcall_promstop
-xcall_promstop:
-        rdpr            %pstate, %g2
-        wrpr            %g2, PSTATE_IG | PSTATE_AG, %pstate
-        rdpr            %pil, %g2
-        wrpr            %g0, 15, %pil
-        sethi           %hi(109f), %g7
-        b,pt            %xcc, etrap_irq
-109:     or             %g7, %lo(109b), %g7
-        flushw
-        call            prom_stopself
-         nop
-        /* We should not return, just spin if we do... */
-1:      b,a,pt          %xcc, 1b
-        nop
-
         .data
 
 errata32_hwbug:
diff --git a/arch/sparc64/prom/misc.c b/arch/sparc64/prom/misc.c
index 9b895faf077b..87f5cfce23bb 100644
--- a/arch/sparc64/prom/misc.c
+++ b/arch/sparc64/prom/misc.c
@@ -68,19 +68,11 @@ void prom_cmdline(void)
         local_irq_restore(flags);
 }
 
-#ifdef CONFIG_SMP
-extern void smp_promstop_others(void);
-#endif
-
 /* Drop into the prom, but completely terminate the program.
  * No chance of continuing.
  */
 void prom_halt(void)
 {
-#ifdef CONFIG_SMP
-        smp_promstop_others();
-        udelay(8000);
-#endif
 again:
         p1275_cmd("exit", P1275_INOUT(0, 0));
         goto again; /* PROM is out to get me -DaveM */
@@ -88,10 +80,6 @@ again:
 
 void prom_halt_power_off(void)
 {
-#ifdef CONFIG_SMP
-        smp_promstop_others();
-        udelay(8000);
-#endif
         p1275_cmd("SUNW,power-off", P1275_INOUT(0, 0));
 
         /* if nothing else helps, we just halt */
diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index a917ab7475ac..1fd5fc6d0fe3 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -1119,6 +1119,36 @@ static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int
         host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
 }
 
+static unsigned int scsi_rbuf_get(struct scsi_cmnd *cmd, unsigned char **buf_out)
+{
+        unsigned char *buf;
+        unsigned int buflen;
+
+        if (cmd->use_sg) {
+                struct scatterlist *sg;
+
+                sg = (struct scatterlist *) cmd->request_buffer;
+                buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+                buflen = sg->length;
+        } else {
+                buf = cmd->request_buffer;
+                buflen = cmd->request_bufflen;
+        }
+
+        *buf_out = buf;
+        return buflen;
+}
+
+static void scsi_rbuf_put(struct scsi_cmnd *cmd, unsigned char *buf)
+{
+        if (cmd->use_sg) {
+                struct scatterlist *sg;
+
+                sg = (struct scatterlist *) cmd->request_buffer;
+                kunmap_atomic(buf - sg->offset, KM_IRQ0);
+        }
+}
+
 /*
  * Until we scan the entire bus with inquiries, go throught this fella...
  */
@@ -1145,11 +1175,9 @@ static void ourdone(struct scsi_cmnd *Cmnd)
                 int ok = host_byte(Cmnd->result) == DID_OK;
                 if (Cmnd->cmnd[0] == 0x12 && ok) {
                         unsigned char *iqd;
+                        unsigned int iqd_len;
 
-                        if (Cmnd->use_sg != 0)
-                                BUG();
-
-                        iqd = ((unsigned char *)Cmnd->buffer);
+                        iqd_len = scsi_rbuf_get(Cmnd, &iqd);
 
                         /* tags handled in midlayer */
                         /* enable sync mode? */
@@ -1163,6 +1191,9 @@ static void ourdone(struct scsi_cmnd *Cmnd)
                         if (iqd[7] & 0x20) {
                                 qpti->dev_param[tgt].device_flags |= 0x20;
                         }
+
+                        scsi_rbuf_put(Cmnd, iqd);
+
                         qpti->sbits |= (1 << tgt);
                 } else if (!ok) {
                         qpti->sbits |= (1 << tgt);
diff --git a/include/asm-sparc64/pbm.h b/include/asm-sparc64/pbm.h
index 38bbbccb4068..dd35a2c7798a 100644
--- a/include/asm-sparc64/pbm.h
+++ b/include/asm-sparc64/pbm.h
@@ -27,23 +27,27 @@
  * PCI bus.
  */
 
-#define PBM_LOGCLUSTERS 3
-#define PBM_NCLUSTERS (1 << PBM_LOGCLUSTERS)
-
 struct pci_controller_info;
 
 /* This contains the software state necessary to drive a PCI
  * controller's IOMMU.
  */
+struct pci_iommu_arena {
+        unsigned long   *map;
+        unsigned int    hint;
+        unsigned int    limit;
+};
+
 struct pci_iommu {
         /* This protects the controller's IOMMU and all
          * streaming buffers underneath.
          */
         spinlock_t      lock;
 
+        struct pci_iommu_arena arena;
+
         /* IOMMU page table, a linear array of ioptes. */
         iopte_t         *page_table;            /* The page table itself. */
-        int             page_table_sz_bits;     /* log2 of ow many pages does it map? */
 
         /* Base PCI memory space address where IOMMU mappings
          * begin.
@@ -62,12 +66,6 @@ struct pci_iommu {
          */
         unsigned long   write_complete_reg;
 
-        /* The lowest used consistent mapping entry.  Since
-         * we allocate consistent maps out of cluster 0 this
-         * is relative to the beginning of closter 0.
-         */
-        u32             lowest_consistent_map;
-
         /* In order to deal with some buggy third-party PCI bridges that
          * do wrong prefetching, we never mark valid mappings as invalid.
          * Instead we point them at this dummy page.
@@ -75,16 +73,6 @@ struct pci_iommu {
         unsigned long   dummy_page;
         unsigned long   dummy_page_pa;
 
-        /* If PBM_NCLUSTERS is ever decreased to 4 or lower,
-         * or if largest supported page_table_sz * 8K goes above
-         * 2GB, you must increase the size of the type of
-         * these counters.  You have been duly warned. -DaveM
-         */
-        struct {
-                u16     next;
-                u16     flush;
-        } alloc_info[PBM_NCLUSTERS];
-
         /* CTX allocation. */
         unsigned long ctx_lowest_free;
         unsigned long ctx_bitmap[IOMMU_NUM_CTXS / (sizeof(unsigned long) * 8)];
@@ -102,7 +90,7 @@ struct pci_iommu {
         u32 dma_addr_mask;
 };
 
-extern void pci_iommu_table_init(struct pci_iommu *, int);
+extern void pci_iommu_table_init(struct pci_iommu *iommu, int tsbsize, u32 dma_offset, u32 dma_addr_mask);
 
 /* This describes a PCI bus module's streaming buffer. */
 struct pci_strbuf {