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Subject[PATCH 06/10] swiotlb: use swiotlb_alloc_boot to allocate emergency pool
Date
Also fix xen_swiotlb_fixup() to deal with sub-slab-sized allocations.

[ Impact: bugfix ]
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
drivers/pci/xen-iommu.c | 12 +++++++++---
lib/swiotlb.c | 3 ++-
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/xen-iommu.c b/drivers/pci/xen-iommu.c
index 678a0e5..bc64397 100644
--- a/drivers/pci/xen-iommu.c
+++ b/drivers/pci/xen-iommu.c
@@ -48,16 +48,22 @@ void xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
buf, size);

dma_bits = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT) + PAGE_SHIFT;
- for (i = 0; i < nslabs; i += IO_TLB_SEGSIZE) {
+
+ i = 0;
+ do {
+ int slabs = min(nslabs - i, (unsigned long)IO_TLB_SEGSIZE);
+
do {
rc = xen_create_contiguous_region(
(unsigned long)buf + (i << IO_TLB_SHIFT),
- get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT),
+ get_order(slabs << IO_TLB_SHIFT),
dma_bits);
} while (rc && dma_bits++ < max_dma_bits);
if (rc)
panic(KERN_ERR "xen_create_contiguous_region failed\n");
- }
+
+ i += slabs;
+ } while(i < nslabs);
}

int xen_wants_swiotlb(void)
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 2b0b5a7..a69834c 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -202,7 +202,8 @@ swiotlb_init_with_default_size(size_t default_size)
/*
* Get the overflow emergency buffer
*/
- io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
+ io_tlb_overflow_buffer = swiotlb_alloc_boot(io_tlb_overflow,
+ io_tlb_overflow >> IO_TLB_SHIFT);
if (!io_tlb_overflow_buffer)
panic("Cannot allocate SWIOTLB overflow buffer!\n");

--
1.6.0.6


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