diff options
Diffstat (limited to 'drivers/gpu/msm/kgsl_iommu.c')
| -rw-r--r-- | drivers/gpu/msm/kgsl_iommu.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c index 30f7c9543e38..ffab5423d694 100644 --- a/drivers/gpu/msm/kgsl_iommu.c +++ b/drivers/gpu/msm/kgsl_iommu.c @@ -20,6 +20,7 @@ #include <linux/msm_kgsl.h> #include <linux/ratelimit.h> #include <linux/of_platform.h> +#include <linux/random.h> #include <soc/qcom/scm.h> #include <soc/qcom/secure_buffer.h> #include <stddef.h> @@ -198,7 +199,7 @@ static void kgsl_iommu_remove_global(struct kgsl_mmu *mmu, static void kgsl_iommu_add_global(struct kgsl_mmu *mmu, struct kgsl_memdesc *memdesc, const char *name) { - int bit; + u32 bit, start = 0; u64 size = kgsl_memdesc_footprint(memdesc); if (memdesc->gpuaddr != 0) @@ -207,10 +208,26 @@ static void kgsl_iommu_add_global(struct kgsl_mmu *mmu, if (WARN_ON(global_pt_count >= GLOBAL_PT_ENTRIES)) return; - bit = bitmap_find_next_zero_area(global_map, GLOBAL_MAP_PAGES, - 0, size >> PAGE_SHIFT, 0); + if (WARN_ON(size > KGSL_IOMMU_GLOBAL_MEM_SIZE)) + return; + + if (memdesc->priv & KGSL_MEMDESC_RANDOM) { + u32 range = GLOBAL_MAP_PAGES - (size >> PAGE_SHIFT); + + start = get_random_int() % range; + } + + while (start >= 0) { + bit = bitmap_find_next_zero_area(global_map, GLOBAL_MAP_PAGES, + start, size >> PAGE_SHIFT, 0); + + if (bit < GLOBAL_MAP_PAGES) + break; + + start--; + } - if (WARN_ON(bit >= GLOBAL_MAP_PAGES)) + if (WARN_ON(start < 0)) return; memdesc->gpuaddr = |