This is a note to let you know that I've just added the patch titled
drm/panfrost: Use u64 for size in lock_region
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-panfrost-use-u64-for-size-in-lock_region.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a77b58825d7221d4a45c47881c35a47ba003aa73 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
Date: Tue, 24 Aug 2021 13:30:26 -0400
Subject: drm/panfrost: Use u64 for size in lock_region
From: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Suggested-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Chris Morgan <macromorgan@xxxxxxxxxxx>
Reviewed-by: Steven Price <steven.price@xxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210824173028.7528-3-alyssa.rosenzweig@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -55,7 +55,7 @@ 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;
@@ -75,7 +75,7 @@ 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;
@@ -92,7 +92,7 @@ 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;
@@ -109,7 +109,7 @@ 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);
@@ -125,7 +125,7 @@ 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);
@@ -225,7 +225,7 @@ 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;
Patches currently in stable-queue which might be from alyssa.rosenzweig@xxxxxxxxxxxxx are
queue-5.14/drm-panfrost-clamp-lock-region-to-bifrost-minimum.patch
queue-5.14/drm-panfrost-simplify-lock_region-calculation.patch
queue-5.14/drm-panfrost-use-u64-for-size-in-lock_region.patch
