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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-09-23 23:08:43 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-09-23 23:08:43 +0200 |
| commit | d7a4b414eed51f1653bb05ebe84122bf9a7ae18b (patch) | |
| tree | bd6603a0c27de4c138a1767871897e9cd3e1a1d2 /arch/x86/kernel/pci-dma.c | |
| parent | 1f0ab40976460bc4673fa204ce917a725185d8f2 (diff) | |
| parent | a724eada8c2a7b62463b73ccf73fd0bb6e928aeb (diff) | |
Merge commit 'linus/master' into tracing/kprobes
Conflicts:
kernel/trace/Makefile
kernel/trace/trace.h
kernel/trace/trace_event_types.h
kernel/trace/trace_export.c
Merge reason:
Sync with latest significant tracing core changes.
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 1a041bcf506..64b838eac18 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -3,6 +3,7 @@ #include <linux/dmar.h> #include <linux/bootmem.h> #include <linux/pci.h> +#include <linux/kmemleak.h> #include <asm/proto.h> #include <asm/dma.h> @@ -32,7 +33,14 @@ int no_iommu __read_mostly; /* Set this to 1 if there is a HW IOMMU in the system */ int iommu_detected __read_mostly = 0; -int iommu_pass_through; +/* + * This variable becomes 1 if iommu=pt is passed on the kernel command line. + * If this variable is 1, IOMMU implementations do no DMA ranslation for + * devices and allow every device to access to whole physical memory. This is + * useful if a user want to use an IOMMU only for KVM device assignment to + * guests and not for driver dma translation. + */ +int iommu_pass_through __read_mostly; dma_addr_t bad_dma_address __read_mostly = 0; EXPORT_SYMBOL(bad_dma_address); @@ -88,6 +96,11 @@ void __init dma32_reserve_bootmem(void) size = roundup(dma32_bootmem_size, align); dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align, 512ULL<<20); + /* + * Kmemleak should not scan this block as it may not be mapped via the + * kernel direct mapping. + */ + kmemleak_ignore(dma32_bootmem_ptr); if (dma32_bootmem_ptr) dma32_bootmem_size = size; else @@ -147,7 +160,7 @@ again: return NULL; addr = page_to_phys(page); - if (!is_buffer_dma_capable(dma_mask, addr, size)) { + if (addr + size > dma_mask) { __free_pages(page, get_order(size)); if (dma_mask < DMA_BIT_MASK(32) && !(flag & GFP_DMA)) { @@ -212,10 +225,8 @@ static __init int iommu_setup(char *p) if (!strncmp(p, "soft", 4)) swiotlb = 1; #endif - if (!strncmp(p, "pt", 2)) { + if (!strncmp(p, "pt", 2)) iommu_pass_through = 1; - return 1; - } gart_parse_options(p); |