#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
+#include <linux/scatterlist.h>
#include <linux/log2.h>
+#include <linux/dma-mapping.h>
+#include <linux/iommu-helper.h>
#include <asm/io.h>
#include <asm/hwrpb.h>
#endif
#define DEBUG_NODIRECT 0
-#define DEBUG_FORCEDAC 0
#define ISA_DMA_MASK 0x00ffffff
/* 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;
+
+ base = arena->dma_base >> PAGE_SHIFT;
+ if (dev) {
+ boundary_size = dma_get_seg_boundary(dev) + 1;
+ boundary_size >>= PAGE_SHIFT;
+ } else {
+ boundary_size = 1UL << (32 - PAGE_SHIFT);
+ }
/* 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 && iommu_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;
}
}
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;
/* 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;
unsigned long paddr;
dma_addr_t ret;
unsigned int align = 0;
+ struct device *dev = pdev ? &pdev->dev : NULL;
paddr = __pa(cpu_addr);
/* 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");
#define SG_ENT_PHYS_ADDRESS(SG) __pa(SG_ENT_VIRT_ADDRESS(SG))
static void
-sg_classify(struct scatterlist *sg, struct scatterlist *end, int virt_ok)
+sg_classify(struct device *dev, struct scatterlist *sg, struct scatterlist *end,
+ int virt_ok)
{
unsigned long next_paddr;
struct scatterlist *leader;
long leader_flag, leader_length;
+ unsigned int max_seg_size;
leader = sg;
leader_flag = 0;
leader_length = leader->length;
next_paddr = SG_ENT_PHYS_ADDRESS(leader) + leader_length;
+ /* we will not marge sg without device. */
+ max_seg_size = dev ? dma_get_max_seg_size(dev) : 0;
for (++sg; sg < end; ++sg) {
unsigned long addr, len;
addr = SG_ENT_PHYS_ADDRESS(sg);
len = sg->length;
+ if (leader_length + len > max_seg_size)
+ goto new_segment;
+
if (next_paddr == addr) {
sg->dma_address = -1;
leader_length += len;
leader_flag = 1;
leader_length += len;
} else {
+new_segment:
leader->dma_address = leader_flag;
leader->dma_length = leader_length;
leader = sg;
in the blanks. */
static int
-sg_fill(struct scatterlist *leader, struct scatterlist *end,
+sg_fill(struct device *dev, struct scatterlist *leader, struct scatterlist *end,
struct scatterlist *out, struct pci_iommu_arena *arena,
dma_addr_t max_dma, int dac_allowed)
{
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)
/* Otherwise, break up the remaining virtually contiguous
hunks into individual direct maps and retry. */
- sg_classify(leader, end, 0);
- return sg_fill(leader, end, out, arena, max_dma, dac_allowed);
+ sg_classify(dev, leader, end, 0);
+ return sg_fill(dev, leader, end, out, arena, max_dma, dac_allowed);
}
out->dma_address = arena->dma_base + dma_ofs*PAGE_SIZE + paddr;
struct pci_iommu_arena *arena;
dma_addr_t max_dma;
int dac_allowed;
+ struct device *dev;
if (direction == PCI_DMA_NONE)
BUG();
dac_allowed = pdev ? pci_dac_dma_supported(pdev, pdev->dma_mask) : 0;
+ dev = pdev ? &pdev->dev : NULL;
+
/* Fast path single entry scatterlists. */
if (nents == 1) {
sg->dma_length = sg->length;
end = sg + nents;
/* First, prepare information about the entries. */
- sg_classify(sg, end, alpha_mv.mv_pci_tbi != 0);
+ sg_classify(dev, sg, end, alpha_mv.mv_pci_tbi != 0);
/* Second, figure out where we're going to map things. */
if (alpha_mv.mv_pci_tbi) {
for (out = sg; sg < end; ++sg) {
if ((int) sg->dma_address < 0)
continue;
- if (sg_fill(sg, end, out, arena, max_dma, dac_allowed) < 0)
+ if (sg_fill(dev, sg, end, out, arena, max_dma, dac_allowed) < 0)
goto error;
out++;
}
/* 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;
git.samba.org / sfrench / cifs-2.6.git / blobdiff