From: Boris Brezillon boris.brezillon@collabora.com
commit 3aa0a80fc692c9959c261f4c5bfe9c23ddd90562 upstream.
When a fault is handled it will unblock the GPU which will continue executing its shader and might fault almost immediately on a different page. If we clear interrupts after handling the fault we might miss new faults, so clear them before.
Cc: stable@vger.kernel.org Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations") Signed-off-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Steven Price steven.price@arm.com Link: https://patchwork.freedesktop.org/patch/msgid/20210205111757.585248-2-boris.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panfrost/panfrost_mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -593,6 +593,8 @@ static irqreturn_t panfrost_mmu_irq_hand access_type = (fault_status >> 8) & 0x3; source_id = (fault_status >> 16);
+ mmu_write(pfdev, MMU_INT_CLEAR, mask); + /* Page fault only */ ret = -1; if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0) @@ -616,8 +618,6 @@ static irqreturn_t panfrost_mmu_irq_hand access_type, access_type_name(pfdev, fault_status), source_id);
- mmu_write(pfdev, MMU_INT_CLEAR, mask); - status &= ~mask; }