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Diffstat (limited to 'arch/alpha/kernel/pci_iommu.c')
-rw-r--r--arch/alpha/kernel/pci_iommu.c73
1 files changed, 51 insertions, 22 deletions
diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index 26d3789..be6fa10 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -31,7 +31,6 @@
#endif
#define DEBUG_NODIRECT 0
-#define DEBUG_FORCEDAC 0
#define ISA_DMA_MASK 0x00ffffff
@@ -126,39 +125,67 @@ iommu_arena_new(struct pci_controller *hose, dma_addr_t base,
return iommu_arena_new_node(0, hose, base, window_size, align);
}
+static inline int is_span_boundary(unsigned int index, unsigned int nr,
+ unsigned long shift,
+ unsigned long boundary_size)
+{
+ shift = (shift + index) & (boundary_size - 1);
+ return shift + nr > boundary_size;
+}
+
/* Must be called with the arena lock held */
static long
-iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask)
+iommu_arena_find_pages(struct device *dev, struct pci_iommu_arena *arena,
+ long n, long mask)
{
unsigned long *ptes;
long i, p, nent;
+ int pass = 0;
+ unsigned long base;
+ unsigned long boundary_size;
+
+ BUG_ON(arena->dma_base & ~PAGE_MASK);
+ base = arena->dma_base >> PAGE_SHIFT;
+ if (dev)
+ boundary_size = ALIGN(dma_get_max_seg_size(dev) + 1, PAGE_SIZE)
+ >> PAGE_SHIFT;
+ else
+ boundary_size = ALIGN(1UL << 32, PAGE_SIZE) >> PAGE_SHIFT;
+
+ BUG_ON(!is_power_of_2(boundary_size));
/* Search forward for the first mask-aligned sequence of N free ptes */
ptes = arena->ptes;
nent = arena->size >> PAGE_SHIFT;
- p = (arena->next_entry + mask) & ~mask;
+ p = ALIGN(arena->next_entry, mask + 1);
i = 0;
+
+again:
while (i < n && p+i < nent) {
+ if (!i && is_span_boundary(p, n, base, boundary_size)) {
+ p = ALIGN(p + 1, mask + 1);
+ goto again;
+ }
+
if (ptes[p+i])
- p = (p + i + 1 + mask) & ~mask, i = 0;
+ p = ALIGN(p + i + 1, mask + 1), i = 0;
else
i = i + 1;
}
if (i < n) {
- /* Reached the end. Flush the TLB and restart the
- search from the beginning. */
- alpha_mv.mv_pci_tbi(arena->hose, 0, -1);
-
- p = 0, i = 0;
- while (i < n && p+i < nent) {
- if (ptes[p+i])
- p = (p + i + 1 + mask) & ~mask, i = 0;
- else
- i = i + 1;
- }
-
- if (i < n)
+ if (pass < 1) {
+ /*
+ * Reached the end. Flush the TLB and restart
+ * the search from the beginning.
+ */
+ alpha_mv.mv_pci_tbi(arena->hose, 0, -1);
+
+ pass++;
+ p = 0;
+ i = 0;
+ goto again;
+ } else
return -1;
}
@@ -168,7 +195,8 @@ iommu_arena_find_pages(struct pci_iommu_arena *arena, long n, long mask)
}
static long
-iommu_arena_alloc(struct pci_iommu_arena *arena, long n, unsigned int align)
+iommu_arena_alloc(struct device *dev, struct pci_iommu_arena *arena, long n,
+ unsigned int align)
{
unsigned long flags;
unsigned long *ptes;
@@ -179,7 +207,7 @@ iommu_arena_alloc(struct pci_iommu_arena *arena, long n, unsigned int align)
/* Search for N empty ptes */
ptes = arena->ptes;
mask = max(align, arena->align_entry) - 1;
- p = iommu_arena_find_pages(arena, n, mask);
+ p = iommu_arena_find_pages(dev, arena, n, mask);
if (p < 0) {
spin_unlock_irqrestore(&arena->lock, flags);
return -1;
@@ -229,6 +257,7 @@ pci_map_single_1(struct pci_dev *pdev, void *cpu_addr, size_t size,
unsigned long paddr;
dma_addr_t ret;
unsigned int align = 0;
+ struct device *dev = pdev ? &pdev->dev : NULL;
paddr = __pa(cpu_addr);
@@ -276,7 +305,7 @@ pci_map_single_1(struct pci_dev *pdev, void *cpu_addr, size_t size,
/* Force allocation to 64KB boundary for ISA bridges. */
if (pdev && pdev == isa_bridge)
align = 8;
- dma_ofs = iommu_arena_alloc(arena, npages, align);
+ dma_ofs = iommu_arena_alloc(dev, arena, npages, align);
if (dma_ofs < 0) {
printk(KERN_WARNING "pci_map_single failed: "
"could not allocate dma page tables\n");
@@ -563,7 +592,7 @@ sg_fill(struct device *dev, struct scatterlist *leader, struct scatterlist *end,
paddr &= ~PAGE_MASK;
npages = calc_npages(paddr + size);
- dma_ofs = iommu_arena_alloc(arena, npages, 0);
+ dma_ofs = iommu_arena_alloc(dev, arena, npages, 0);
if (dma_ofs < 0) {
/* If we attempted a direct map above but failed, die. */
if (leader->dma_address == 0)
@@ -830,7 +859,7 @@ iommu_reserve(struct pci_iommu_arena *arena, long pg_count, long align_mask)
/* Search for N empty ptes. */
ptes = arena->ptes;
- p = iommu_arena_find_pages(arena, pg_count, align_mask);
+ p = iommu_arena_find_pages(NULL, arena, pg_count, align_mask);
if (p < 0) {
spin_unlock_irqrestore(&arena->lock, flags);
return -1;
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