From d038aee24dcd5a2a0d8547f5396f67ae9698ac8e Mon Sep 17 00:00:00 2001 From: David Cohen Date: Wed, 9 Mar 2011 09:17:33 +0000 Subject: [PATCH] omap: iovmm: don't check 'da' to set IOVMF_DA_FIXED flag Currently IOVMM driver sets IOVMF_DA_FIXED/IOVMF_DA_ANON flags according to input 'da' address when mapping memory: da == 0: IOVMF_DA_ANON da != 0: IOVMF_DA_FIXED It prevents IOMMU to map first page with fixed 'da'. To avoid such issue, IOVMM will not automatically set IOVMF_DA_FIXED. It should now come from the user throught 'flags' parameter when mapping memory. As IOVMF_DA_ANON and IOVMF_DA_FIXED are mutually exclusive, IOVMF_DA_ANON can be removed. The driver will now check internally if IOVMF_DA_FIXED is set or not. Signed-off-by: David Cohen Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/include/plat/iovmm.h | 2 -- arch/arm/plat-omap/iovmm.c | 14 +++++--------- 2 files changed, 5 insertions(+), 11 deletions(-) diff --git a/arch/arm/plat-omap/include/plat/iovmm.h b/arch/arm/plat-omap/include/plat/iovmm.h index bdc7ce5d7a4a..32a2f6c4d39e 100644 --- a/arch/arm/plat-omap/include/plat/iovmm.h +++ b/arch/arm/plat-omap/include/plat/iovmm.h @@ -71,8 +71,6 @@ struct iovm_struct { #define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT)) #define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT)) -#define IOVMF_DA_ANON (2 << (4 + IOVMF_SW_SHIFT)) -#define IOVMF_DA_MASK (3 << (4 + IOVMF_SW_SHIFT)) extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da); diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c index ea7eab98a736..51ef43e8def6 100644 --- a/arch/arm/plat-omap/iovmm.c +++ b/arch/arm/plat-omap/iovmm.c @@ -279,7 +279,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, start = da; alignment = PAGE_SIZE; - if (flags & IOVMF_DA_ANON) { + if (~flags & IOVMF_DA_FIXED) { /* Don't map address 0 */ start = obj->da_start ? obj->da_start : alignment; @@ -304,7 +304,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, if (tmp->da_start > start && (tmp->da_start - start) >= bytes) goto found; - if (tmp->da_end >= start && flags & IOVMF_DA_ANON) + if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED) start = roundup(tmp->da_end + 1, alignment); prev_end = tmp->da_end; @@ -651,7 +651,6 @@ u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt, flags &= IOVMF_HW_MASK; flags |= IOVMF_DISCONT; flags |= IOVMF_MMIO; - flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); da = __iommu_vmap(obj, da, sgt, va, bytes, flags); if (IS_ERR_VALUE(da)) @@ -691,7 +690,7 @@ EXPORT_SYMBOL_GPL(iommu_vunmap); * @flags: iovma and page property * * Allocate @bytes linearly and creates 1-n-1 mapping and returns - * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. + * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set. */ u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) { @@ -710,7 +709,6 @@ u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) flags &= IOVMF_HW_MASK; flags |= IOVMF_DISCONT; flags |= IOVMF_ALLOC; - flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); sgt = sgtable_alloc(bytes, flags, da, 0); if (IS_ERR(sgt)) { @@ -781,7 +779,7 @@ static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va, * @flags: iovma and page property * * Creates 1-1-1 mapping and returns @da again, which can be - * adjusted if 'IOVMF_DA_ANON' is set. + * adjusted if 'IOVMF_DA_FIXED' is not set. */ u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes, u32 flags) @@ -800,7 +798,6 @@ u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes, flags &= IOVMF_HW_MASK; flags |= IOVMF_LINEAR; flags |= IOVMF_MMIO; - flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); da = __iommu_kmap(obj, da, pa, va, bytes, flags); if (IS_ERR_VALUE(da)) @@ -839,7 +836,7 @@ EXPORT_SYMBOL_GPL(iommu_kunmap); * @flags: iovma and page property * * Allocate @bytes linearly and creates 1-1-1 mapping and returns - * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. + * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set. */ u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) { @@ -859,7 +856,6 @@ u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) flags &= IOVMF_HW_MASK; flags |= IOVMF_LINEAR; flags |= IOVMF_ALLOC; - flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); da = __iommu_kmap(obj, da, pa, va, bytes, flags); if (IS_ERR_VALUE(da)) -- GitLab