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AMD IOMMU: add statistics about allocated io memory

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Impact: see amount of allocated io memory in debugfs

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-12 15:57:30 +01:00
parent 18811f55d4
commit 5774f7c5fe
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/amd_iommu.c
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@ -74,6 +74,7 @@ DECLARE_STATS_COUNTER(cnt_free_coherent);
DECLARE_STATS_COUNTER(cross_page);
DECLARE_STATS_COUNTER(domain_flush_single);
DECLARE_STATS_COUNTER(domain_flush_all);
DECLARE_STATS_COUNTER(alloced_io_mem);
static struct dentry *stats_dir;
static struct dentry *de_isolate;
@ -110,6 +111,7 @@ static void amd_iommu_stats_init(void)
amd_iommu_stats_add(&cross_page);
amd_iommu_stats_add(&domain_flush_single);
amd_iommu_stats_add(&domain_flush_all);
amd_iommu_stats_add(&alloced_io_mem);
}
#endif
@ -1246,6 +1248,8 @@ static dma_addr_t __map_single(struct device *dev,
}
address += offset;
ADD_STATS_COUNTER(alloced_io_mem, size);
if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
iommu_flush_tlb(iommu, dma_dom->domain.id);
dma_dom->need_flush = false;
@ -1282,6 +1286,8 @@ static void __unmap_single(struct amd_iommu *iommu,
start += PAGE_SIZE;
}
SUB_STATS_COUNTER(alloced_io_mem, size);
dma_ops_free_addresses(dma_dom, dma_addr, pages);
if (amd_iommu_unmap_flush || dma_dom->need_flush) {