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-rw-r--r--arch/sparc64/kernel/iommu.c231
-rw-r--r--arch/sparc64/kernel/pci_sun4v.c206
-rw-r--r--include/asm-sparc64/io.h2
3 files changed, 291 insertions, 148 deletions
diff --git a/arch/sparc64/kernel/iommu.c b/arch/sparc64/kernel/iommu.c
index 90a5907..d3276ebc 100644
--- a/arch/sparc64/kernel/iommu.c
+++ b/arch/sparc64/kernel/iommu.c
@@ -512,124 +512,209 @@ static void dma_4u_unmap_single(struct device *dev, dma_addr_t bus_addr,
static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
- unsigned long flags, ctx, i, npages, iopte_protection;
- struct scatterlist *sg;
+ struct scatterlist *s, *outs, *segstart;
+ unsigned long flags, handle, prot, ctx;
+ dma_addr_t dma_next = 0, dma_addr;
+ unsigned int max_seg_size;
+ int outcount, incount, i;
struct strbuf *strbuf;
struct iommu *iommu;
- iopte_t *base;
- u32 dma_base;
-
- /* Fast path single entry scatterlists. */
- if (nelems == 1) {
- sglist->dma_address =
- dma_4u_map_single(dev, sg_virt(sglist),
- sglist->length, direction);
- if (unlikely(sglist->dma_address == DMA_ERROR_CODE))
- return 0;
- sglist->dma_length = sglist->length;
- return 1;
- }
+
+ BUG_ON(direction == DMA_NONE);
iommu = dev->archdata.iommu;
strbuf = dev->archdata.stc;
-
- if (unlikely(direction == DMA_NONE))
- goto bad_no_ctx;
-
- npages = calc_npages(sglist, nelems);
+ if (nelems == 0 || !iommu)
+ return 0;
spin_lock_irqsave(&iommu->lock, flags);
- base = alloc_npages(dev, 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);
-
if (strbuf->strbuf_enabled)
- iopte_protection = IOPTE_STREAMING(ctx);
+ prot = IOPTE_STREAMING(ctx);
else
- iopte_protection = IOPTE_CONSISTENT(ctx);
+ prot = IOPTE_CONSISTENT(ctx);
if (direction != DMA_TO_DEVICE)
- iopte_protection |= IOPTE_WRITE;
-
- for_each_sg(sglist, sg, nelems, i) {
- unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
- unsigned long slen = sg->length;
- unsigned long this_npages;
+ prot |= IOPTE_WRITE;
+
+ outs = s = segstart = &sglist[0];
+ outcount = 1;
+ incount = nelems;
+ handle = 0;
+
+ /* Init first segment length for backout at failure */
+ outs->dma_length = 0;
+
+ max_seg_size = dma_get_max_seg_size(dev);
+ for_each_sg(sglist, s, nelems, i) {
+ unsigned long paddr, npages, entry, slen;
+ iopte_t *base;
+
+ slen = s->length;
+ /* Sanity check */
+ if (slen == 0) {
+ dma_next = 0;
+ continue;
+ }
+ /* Allocate iommu entries for that segment */
+ paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
+ npages = iommu_num_pages(paddr, slen);
+ entry = iommu_range_alloc(dev, iommu, npages, &handle);
+
+ /* Handle failure */
+ if (unlikely(entry == DMA_ERROR_CODE)) {
+ if (printk_ratelimit())
+ printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
+ " npages %lx\n", iommu, paddr, npages);
+ goto iommu_map_failed;
+ }
- this_npages = iommu_num_pages(paddr, slen);
+ base = iommu->page_table + entry;
- sg->dma_address = dma_base | (paddr & ~IO_PAGE_MASK);
- sg->dma_length = slen;
+ /* Convert entry to a dma_addr_t */
+ dma_addr = iommu->page_table_map_base +
+ (entry << IO_PAGE_SHIFT);
+ dma_addr |= (s->offset & ~IO_PAGE_MASK);
+ /* Insert into HW table */
paddr &= IO_PAGE_MASK;
- while (this_npages--) {
- iopte_val(*base) = iopte_protection | paddr;
-
+ while (npages--) {
+ iopte_val(*base) = prot | paddr;
base++;
paddr += IO_PAGE_SIZE;
- dma_base += IO_PAGE_SIZE;
}
+
+ /* If we are in an open segment, try merging */
+ if (segstart != s) {
+ /* We cannot merge if:
+ * - allocated dma_addr isn't contiguous to previous allocation
+ */
+ if ((dma_addr != dma_next) ||
+ (outs->dma_length + s->length > max_seg_size)) {
+ /* Can't merge: create a new segment */
+ segstart = s;
+ outcount++;
+ outs = sg_next(outs);
+ } else {
+ outs->dma_length += s->length;
+ }
+ }
+
+ if (segstart == s) {
+ /* This is a new segment, fill entries */
+ outs->dma_address = dma_addr;
+ outs->dma_length = slen;
+ }
+
+ /* Calculate next page pointer for contiguous check */
+ dma_next = dma_addr + slen;
}
- return nelems;
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+ if (outcount < incount) {
+ outs = sg_next(outs);
+ outs->dma_address = DMA_ERROR_CODE;
+ outs->dma_length = 0;
+ }
+
+ return outcount;
+
+iommu_map_failed:
+ for_each_sg(sglist, s, nelems, i) {
+ if (s->dma_length != 0) {
+ unsigned long vaddr, npages, entry, i;
+ iopte_t *base;
+
+ vaddr = s->dma_address & IO_PAGE_MASK;
+ npages = iommu_num_pages(s->dma_address, s->dma_length);
+ iommu_range_free(iommu, vaddr, npages);
+
+ entry = (vaddr - iommu->page_table_map_base)
+ >> IO_PAGE_SHIFT;
+ base = iommu->page_table + entry;
+
+ for (i = 0; i < npages; i++)
+ iopte_make_dummy(iommu, base + i);
+
+ s->dma_address = DMA_ERROR_CODE;
+ s->dma_length = 0;
+ }
+ if (s == outs)
+ break;
+ }
+ spin_unlock_irqrestore(&iommu->lock, flags);
-bad:
- iommu_free_ctx(iommu, ctx);
-bad_no_ctx:
- if (printk_ratelimit())
- WARN_ON(1);
return 0;
}
+/* If contexts are being used, they are the same in all of the mappings
+ * we make for a particular SG.
+ */
+static unsigned long fetch_sg_ctx(struct iommu *iommu, struct scatterlist *sg)
+{
+ unsigned long ctx = 0;
+
+ if (iommu->iommu_ctxflush) {
+ iopte_t *base;
+ u32 bus_addr;
+
+ bus_addr = sg->dma_address & IO_PAGE_MASK;
+ base = iommu->page_table +
+ ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+
+ ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
+ }
+ return ctx;
+}
+
static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
- unsigned long flags, ctx, i, npages;
+ unsigned long flags, ctx;
+ struct scatterlist *sg;
struct strbuf *strbuf;
struct iommu *iommu;
- iopte_t *base;
- u32 bus_addr;
- if (unlikely(direction == DMA_NONE)) {
- if (printk_ratelimit())
- WARN_ON(1);
- }
+ BUG_ON(direction == DMA_NONE);
iommu = dev->archdata.iommu;
strbuf = dev->archdata.stc;
- bus_addr = sglist->dma_address & IO_PAGE_MASK;
+ ctx = fetch_sg_ctx(iommu, sglist);
- npages = calc_npages(sglist, nelems);
+ spin_lock_irqsave(&iommu->lock, flags);
- base = iommu->page_table +
- ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+ sg = sglist;
+ while (nelems--) {
+ dma_addr_t dma_handle = sg->dma_address;
+ unsigned int len = sg->dma_length;
+ unsigned long npages, entry;
+ iopte_t *base;
+ int i;
- spin_lock_irqsave(&iommu->lock, flags);
+ if (!len)
+ break;
+ npages = iommu_num_pages(dma_handle, len);
+ iommu_range_free(iommu, dma_handle, npages);
- /* Record the context, if any. */
- ctx = 0;
- if (iommu->iommu_ctxflush)
- ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
+ entry = ((dma_handle - iommu->page_table_map_base)
+ >> IO_PAGE_SHIFT);
+ base = iommu->page_table + entry;
- /* Step 1: Kick data out of streaming buffers if necessary. */
- if (strbuf->strbuf_enabled)
- strbuf_flush(strbuf, iommu, bus_addr, ctx, npages, direction);
+ dma_handle &= IO_PAGE_MASK;
+ if (strbuf->strbuf_enabled)
+ strbuf_flush(strbuf, iommu, dma_handle, ctx,
+ npages, direction);
- /* Step 2: Clear out the TSB entries. */
- for (i = 0; i < npages; i++)
- iopte_make_dummy(iommu, base + i);
+ for (i = 0; i < npages; i++)
+ iopte_make_dummy(iommu, base + i);
- iommu_range_free(iommu, bus_addr, npages);
+ sg = sg_next(sg);
+ }
iommu_free_ctx(iommu, ctx);
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index c8b6199..ddca6c6 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -89,6 +89,17 @@ static long iommu_batch_flush(struct iommu_batch *p)
return 0;
}
+static inline void iommu_batch_new_entry(unsigned long entry)
+{
+ struct iommu_batch *p = &__get_cpu_var(iommu_batch);
+
+ if (p->entry + p->npages == entry)
+ return;
+ if (p->entry != ~0UL)
+ iommu_batch_flush(p);
+ p->entry = entry;
+}
+
/* Interrupts must be disabled. */
static inline long iommu_batch_add(u64 phys_page)
{
@@ -320,88 +331,131 @@ static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr,
static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
- unsigned long flags, npages, i, prot;
- u32 dma_base, orig_dma_base;
- struct scatterlist *sg;
+ struct scatterlist *s, *outs, *segstart;
+ unsigned long flags, handle, prot;
+ dma_addr_t dma_next = 0, dma_addr;
+ unsigned int max_seg_size;
+ int outcount, incount, i;
struct iommu *iommu;
- long entry, err;
-
- /* Fast path single entry scatterlists. */
- if (nelems == 1) {
- sglist->dma_address =
- dma_4v_map_single(dev, sg_virt(sglist),
- sglist->length, direction);
- if (unlikely(sglist->dma_address == DMA_ERROR_CODE))
- return 0;
- sglist->dma_length = sglist->length;
- return 1;
- }
+ long err;
+
+ BUG_ON(direction == DMA_NONE);
iommu = dev->archdata.iommu;
+ if (nelems == 0 || !iommu)
+ return 0;
- if (unlikely(direction == DMA_NONE))
- goto bad;
-
- npages = calc_npages(sglist, nelems);
+ prot = HV_PCI_MAP_ATTR_READ;
+ if (direction != DMA_TO_DEVICE)
+ prot |= HV_PCI_MAP_ATTR_WRITE;
- spin_lock_irqsave(&iommu->lock, flags);
- entry = iommu_range_alloc(dev, iommu, npages, NULL);
- spin_unlock_irqrestore(&iommu->lock, flags);
+ outs = s = segstart = &sglist[0];
+ outcount = 1;
+ incount = nelems;
+ handle = 0;
- if (unlikely(entry == DMA_ERROR_CODE))
- goto bad;
+ /* Init first segment length for backout at failure */
+ outs->dma_length = 0;
- orig_dma_base = dma_base = iommu->page_table_map_base +
- (entry << IO_PAGE_SHIFT);
+ spin_lock_irqsave(&iommu->lock, flags);
- prot = HV_PCI_MAP_ATTR_READ;
- if (direction != DMA_TO_DEVICE)
- prot |= HV_PCI_MAP_ATTR_WRITE;
+ iommu_batch_start(dev, prot, ~0UL);
- local_irq_save(flags);
+ max_seg_size = dma_get_max_seg_size(dev);
+ for_each_sg(sglist, s, nelems, i) {
+ unsigned long paddr, npages, entry, slen;
- iommu_batch_start(dev, prot, entry);
+ slen = s->length;
+ /* Sanity check */
+ if (slen == 0) {
+ dma_next = 0;
+ continue;
+ }
+ /* Allocate iommu entries for that segment */
+ paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
+ npages = iommu_num_pages(paddr, slen);
+ entry = iommu_range_alloc(dev, iommu, npages, &handle);
- for_each_sg(sglist, sg, nelems, i) {
- unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
- unsigned long slen = sg->length;
- unsigned long this_npages;
+ /* Handle failure */
+ if (unlikely(entry == DMA_ERROR_CODE)) {
+ if (printk_ratelimit())
+ printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx"
+ " npages %lx\n", iommu, paddr, npages);
+ goto iommu_map_failed;
+ }
- this_npages = iommu_num_pages(paddr, slen);
+ iommu_batch_new_entry(entry);
- sg->dma_address = dma_base | (paddr & ~IO_PAGE_MASK);
- sg->dma_length = slen;
+ /* Convert entry to a dma_addr_t */
+ dma_addr = iommu->page_table_map_base +
+ (entry << IO_PAGE_SHIFT);
+ dma_addr |= (s->offset & ~IO_PAGE_MASK);
+ /* Insert into HW table */
paddr &= IO_PAGE_MASK;
- while (this_npages--) {
+ while (npages--) {
err = iommu_batch_add(paddr);
- if (unlikely(err < 0L)) {
- local_irq_restore(flags);
+ if (unlikely(err < 0L))
goto iommu_map_failed;
+ paddr += IO_PAGE_SIZE;
+ }
+
+ /* If we are in an open segment, try merging */
+ if (segstart != s) {
+ /* We cannot merge if:
+ * - allocated dma_addr isn't contiguous to previous allocation
+ */
+ if ((dma_addr != dma_next) ||
+ (outs->dma_length + s->length > max_seg_size)) {
+ /* Can't merge: create a new segment */
+ segstart = s;
+ outcount++;
+ outs = sg_next(outs);
+ } else {
+ outs->dma_length += s->length;
}
+ }
- paddr += IO_PAGE_SIZE;
- dma_base += IO_PAGE_SIZE;
+ if (segstart == s) {
+ /* This is a new segment, fill entries */
+ outs->dma_address = dma_addr;
+ outs->dma_length = slen;
}
+
+ /* Calculate next page pointer for contiguous check */
+ dma_next = dma_addr + slen;
}
err = iommu_batch_end();
- local_irq_restore(flags);
-
if (unlikely(err < 0L))
goto iommu_map_failed;
- return nelems;
+ spin_unlock_irqrestore(&iommu->lock, flags);
-bad:
- if (printk_ratelimit())
- WARN_ON(1);
- return 0;
+ if (outcount < incount) {
+ outs = sg_next(outs);
+ outs->dma_address = DMA_ERROR_CODE;
+ outs->dma_length = 0;
+ }
+
+ return outcount;
iommu_map_failed:
- spin_lock_irqsave(&iommu->lock, flags);
- iommu_range_free(iommu, orig_dma_base, npages);
+ for_each_sg(sglist, s, nelems, i) {
+ if (s->dma_length != 0) {
+ unsigned long vaddr, npages;
+
+ vaddr = s->dma_address & IO_PAGE_MASK;
+ npages = iommu_num_pages(s->dma_address, s->dma_length);
+ iommu_range_free(iommu, vaddr, npages);
+ /* XXX demap? XXX */
+ s->dma_address = DMA_ERROR_CODE;
+ s->dma_length = 0;
+ }
+ if (s == outs)
+ break;
+ }
spin_unlock_irqrestore(&iommu->lock, flags);
return 0;
@@ -410,39 +464,43 @@ iommu_map_failed:
static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
- unsigned long flags, npages;
struct pci_pbm_info *pbm;
- u32 devhandle, bus_addr;
+ struct scatterlist *sg;
struct iommu *iommu;
- long entry;
+ unsigned long flags;
+ u32 devhandle;
- if (unlikely(direction == DMA_NONE)) {
- if (printk_ratelimit())
- WARN_ON(1);
- }
+ BUG_ON(direction == DMA_NONE);
iommu = dev->archdata.iommu;
pbm = dev->archdata.host_controller;
devhandle = pbm->devhandle;
- bus_addr = sglist->dma_address & IO_PAGE_MASK;
-
- npages = calc_npages(sglist, nelems);
-
- entry = ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
-
spin_lock_irqsave(&iommu->lock, flags);
- iommu_range_free(iommu, bus_addr, npages);
-
- do {
- unsigned long num;
+ sg = sglist;
+ while (nelems--) {
+ dma_addr_t dma_handle = sg->dma_address;
+ unsigned int len = sg->dma_length;
+ unsigned long npages, entry;
+
+ if (!len)
+ break;
+ npages = iommu_num_pages(dma_handle, len);
+ iommu_range_free(iommu, dma_handle, npages);
+
+ entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
+ while (npages) {
+ unsigned long num;
+
+ num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
+ npages);
+ entry += num;
+ npages -= num;
+ }
- num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
- npages);
- entry += num;
- npages -= num;
- } while (npages != 0);
+ sg = sg_next(sg);
+ }
spin_unlock_irqrestore(&iommu->lock, flags);
}
diff --git a/include/asm-sparc64/io.h b/include/asm-sparc64/io.h
index b6ece22..c299b85 100644
--- a/include/asm-sparc64/io.h
+++ b/include/asm-sparc64/io.h
@@ -16,7 +16,7 @@
/* BIO layer definitions. */
extern unsigned long kern_base, kern_size;
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
-#define BIO_VMERGE_BOUNDARY 0
+#define BIO_VMERGE_BOUNDARY 8192
static inline u8 _inb(unsigned long addr)
{
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