diff options
Diffstat (limited to 'drivers/mxc/amd-gpu/common/gsl_mmu.c')
| -rw-r--r-- | drivers/mxc/amd-gpu/common/gsl_mmu.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/mxc/amd-gpu/common/gsl_mmu.c b/drivers/mxc/amd-gpu/common/gsl_mmu.c index 810a058a515d..8259896775b6 100644 --- a/drivers/mxc/amd-gpu/common/gsl_mmu.c +++ b/drivers/mxc/amd-gpu/common/gsl_mmu.c @@ -89,7 +89,8 @@ const unsigned int GSL_PT_PAGE_AP[4] = {(GSL_PT_PAGE_READ | GSL_PT_PAGE_WRITE), #define GSL_PT_MAP_SETBITS(pte, bits) (GSL_PT_MAP_GET(pte) |= (((unsigned int) bits) & GSL_PT_PAGE_AP_MASK)) #define GSL_PT_MAP_SETADDR(pte, pageaddr) (GSL_PT_MAP_GET(pte) = (GSL_PT_MAP_GET(pte) & ~GSL_PT_PAGE_ADDR_MASK) | (((unsigned int) pageaddr) & GSL_PT_PAGE_ADDR_MASK)) -#define GSL_PT_MAP_RESET(pte) (GSL_PT_MAP_GET(pte) = 0) +/* reserve RV and WV bits to work around READ_PROTECTION_ERROR in some cases */ +#define GSL_PT_MAP_RESET(pte) (GSL_PT_MAP_GET(pte) &= ~GSL_PT_PAGE_ADDR_MASK) #define GSL_PT_MAP_RESETBITS(pte, bits) (GSL_PT_MAP_GET(pte) &= ~(((unsigned int) bits) & GSL_PT_PAGE_AP_MASK)) #define GSL_MMU_VIRT_TO_PAGE(va) *((unsigned int *)(pagetable->base.gpuaddr + (GSL_PT_ENTRY_GET(va) * GSL_PT_ENTRY_SIZEBYTES))) @@ -708,6 +709,16 @@ kgsl_mmu_map(gsl_mmu_t *mmu, gpuaddr_t gpubaseaddr, const gsl_scatterlist_t *sca //---------------------------------------------------------------------------- +static bool is_superpte_empty(gsl_pagetable_t *pagetable, unsigned int superpte) +{ + int i; + for (i = 0; i < GSL_PT_SUPER_PTE; i++) { + if (GSL_PT_MAP_GET(superpte+i)) + return false; + } + return true; +} + int kgsl_mmu_unmap(gsl_mmu_t *mmu, gpuaddr_t gpubaseaddr, int range, unsigned int pid) { @@ -777,7 +788,10 @@ kgsl_mmu_unmap(gsl_mmu_t *mmu, gpuaddr_t gpubaseaddr, int range, unsigned int pi { do { - pagetable->last_superpte -= GSL_PT_SUPER_PTE; + if (is_superpte_empty(pagetable, superpte)) + pagetable->last_superpte -= GSL_PT_SUPER_PTE; + else + break; } while (!GSL_PT_MAP_GETADDR(pagetable->last_superpte) && pagetable->last_superpte >= GSL_PT_SUPER_PTE); } |