From: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com
commit a77b58825d7221d4a45c47881c35a47ba003aa73 upstream.
Mali virtual addresses are 48-bit. Use a u64 instead of size_t to ensure we can express the "lock everything" condition as ~0ULL without overflow. This code was silently broken on any platform where a size_t is less than 48-bits; in particular, it was broken on 32-bit armv7 platforms which remain in use with panfrost. (Mainly RK3288)
Signed-off-by: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com Suggested-by: Rob Herring robh@kernel.org Tested-by: Chris Morgan macromorgan@hotmail.com Reviewed-by: Steven Price steven.price@arm.com Reviewed-by: Rob Herring robh@kernel.org Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver") Cc: stable@vger.kernel.org Signed-off-by: Steven Price steven.price@arm.com Link: https://patchwork.freedesktop.org/patch/msgid/20210824173028.7528-3-alyssa.r... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panfrost/panfrost_mmu.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -52,7 +52,7 @@ static int write_cmd(struct panfrost_dev }
static void lock_region(struct panfrost_device *pfdev, u32 as_nr, - u64 iova, size_t size) + u64 iova, u64 size) { u8 region_width; u64 region = iova & PAGE_MASK; @@ -72,7 +72,7 @@ static void lock_region(struct panfrost_
static int mmu_hw_do_operation_locked(struct panfrost_device *pfdev, int as_nr, - u64 iova, size_t size, u32 op) + u64 iova, u64 size, u32 op) { if (as_nr < 0) return 0; @@ -89,7 +89,7 @@ static int mmu_hw_do_operation_locked(st
static int mmu_hw_do_operation(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, - u64 iova, size_t size, u32 op) + u64 iova, u64 size, u32 op) { int ret;
@@ -106,7 +106,7 @@ static void panfrost_mmu_enable(struct p u64 transtab = cfg->arm_mali_lpae_cfg.transtab; u64 memattr = cfg->arm_mali_lpae_cfg.memattr;
- mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM); + mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0ULL, AS_COMMAND_FLUSH_MEM);
mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), transtab & 0xffffffffUL); mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), transtab >> 32); @@ -122,7 +122,7 @@ static void panfrost_mmu_enable(struct p
static void panfrost_mmu_disable(struct panfrost_device *pfdev, u32 as_nr) { - mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM); + mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0ULL, AS_COMMAND_FLUSH_MEM);
mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), 0); mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), 0); @@ -222,7 +222,7 @@ static size_t get_pgsize(u64 addr, size_
static void panfrost_mmu_flush_range(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, - u64 iova, size_t size) + u64 iova, u64 size) { if (mmu->as < 0) return;