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drm/panfrost: Clear MMU irqs before handling the fault

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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: 187d292920 ("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.brezillon@collabora.com
This commit is contained in:
Boris Brezillon 2021-02-05 12:17:55 +01:00
parent 1007377002
commit 3aa0a80fc6
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/panfrost/panfrost_mmu.c
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@ -593,6 +593,8 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
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_handler_thread(int irq, void *data)
access_type, access_type_name(pfdev, fault_status),
source_id);
mmu_write(pfdev, MMU_INT_CLEAR, mask);
status &= ~mask;
}