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rk: iommu: support iommu region guard

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Add an guard area after each iommu region, it is used to detect cross-border access

Signed-off-by: CMY <cmy@rock-chips.com>
Signed-off-by: XXM <xxm@rock-chips.com>
This commit is contained in:
CMY
2015-05-22 17:26:42 +08:00
parent 3a354c544c
commit 47b2346ab1
1 changed files with 6 additions and 2 deletions
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8
drivers/iommu/rockchip-iovmm.c
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@@ -19,6 +19,8 @@
#include "rockchip-iommu.h"
#define IOMMU_REGION_GUARD (2<<PAGE_SHIFT)
static struct rk_vm_region *find_region(struct rk_iovmm *vmm, dma_addr_t iova)
{
struct rk_vm_region *region;
@@ -84,7 +86,8 @@ dma_addr_t rockchip_iovmm_map(struct device *dev,
goto err_map_nomem;
}
start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool, size);
start = (dma_addr_t)gen_pool_alloc(vmm->vmm_pool,
size+IOMMU_REGION_GUARD);
if (!start) {
ret = -ENOMEM;
goto err_map_noiomem;
@@ -197,7 +200,8 @@ void rockchip_iovmm_unmap(struct device *dev, dma_addr_t iova)
/*
rockchip_iommu_tlb_invalidate(dev);
*/
gen_pool_free(vmm->vmm_pool, region->start, region->size);
gen_pool_free(vmm->vmm_pool, region->start,
region->size+IOMMU_REGION_GUARD);
WARN_ON(unmapped_size != region->size);