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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 <dacohen@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
David Cohen 2011-03-09 09:17:33 +00:00 committed by Tony Lindgren
parent 4359d38d51
commit d038aee24d
2 changed files with 5 additions and 11 deletions
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2
arch/arm/plat-omap/include/plat/iovmm.h
View File

@ -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);

14
arch/arm/plat-omap/iovmm.c
View File

@ -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))