drm/panfrost: Use u64 for size in lock_region

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.rosenzweig@collabora.com

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index f6e02d0..3a79527 100644 (file)
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -58,7 +58,7 @@ static int write_cmd(struct panfrost_device *pfdev, u32 as_nr, u32 cmd)
 }
 
 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;
@@ -78,7 +78,7 @@ static void lock_region(struct panfrost_device *pfdev, u32 as_nr,
 
 
 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;
@@ -95,7 +95,7 @@ static int mmu_hw_do_operation_locked(struct panfrost_device *pfdev, int as_nr,
 
 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;
 
@@ -112,7 +112,7 @@ static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_m
        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);
@@ -128,7 +128,7 @@ static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_m
 
 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);
@@ -242,7 +242,7 @@ static size_t get_pgsize(u64 addr, size_t 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;