[PATCH V2] drm/amdgpu: Fix module unload hang by KIQ IRQ set

[deathsimple@xxxxxxxxxxx (Christian König)]

Am 20.02.2017 um 04:03 schrieb Trigger Huang:
> In some cases, manually insmod/rmmod amdgpu is necessary. When
> unloading amdgpu, the KIQ IRQ enable/disable function will case
> system hang. The root cause is, in the sequence of function
> amdgpu_fini, the sw_fini of IP block AMD_IP_BLOCK_TYPE_GFX will be
> invoked earlier than that of AMD_IP_BLOCK_TYPE_IH. So continue to use
> the variable freed by AMD_IP_BLOCK_TYPE_GFX will cause system hang.
>
> Changes in v2:
> -- Refine according to Xiangliang Yu's suggestions
>
> Signed-off-by: Trigger Huang <trigger.huang at amd.com>

Acked-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index 5a484ef..c417324 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -1395,7 +1395,6 @@ static int gfx_v8_0_kiq_init_ring(struct amdgpu_device *adev,
>   		ring->pipe = 1;
>   	}
>   
> -	irq->data = ring;
>   	ring->queue = 0;
>   	sprintf(ring->name, "kiq %d.%d.%d", ring->me, ring->pipe, ring->queue);
>   	r = amdgpu_ring_init(adev, ring, 1024,
> @@ -1410,7 +1409,6 @@ static void gfx_v8_0_kiq_free_ring(struct amdgpu_ring *ring,
>   {
>   	amdgpu_wb_free(ring->adev, ring->adev->virt.reg_val_offs);
>   	amdgpu_ring_fini(ring);
> -	irq->data = NULL;
>   }
>   
>   #define MEC_HPD_SIZE 2048
> @@ -6931,9 +6929,9 @@ static int gfx_v8_0_kiq_set_interrupt_state(struct amdgpu_device *adev,
>   					    enum amdgpu_interrupt_state state)
>   {
>   	uint32_t tmp, target;
> -	struct amdgpu_ring *ring = (struct amdgpu_ring *)src->data;
> +	struct amdgpu_ring *ring = &(adev->gfx.kiq.ring);
>   
> -	BUG_ON(!ring || (ring->funcs->type != AMDGPU_RING_TYPE_KIQ));
> +	BUG_ON(ring->funcs->type != AMDGPU_RING_TYPE_KIQ);
>   
>   	if (ring->me == 1)
>   		target = mmCP_ME1_PIPE0_INT_CNTL;
> @@ -6977,9 +6975,9 @@ static int gfx_v8_0_kiq_irq(struct amdgpu_device *adev,
>   			    struct amdgpu_iv_entry *entry)
>   {
>   	u8 me_id, pipe_id, queue_id;
> -	struct amdgpu_ring *ring = (struct amdgpu_ring *)source->data;
> +	struct amdgpu_ring *ring = &(adev->gfx.kiq.ring);
>   
> -	BUG_ON(!ring || (ring->funcs->type != AMDGPU_RING_TYPE_KIQ));
> +	BUG_ON(ring->funcs->type != AMDGPU_RING_TYPE_KIQ);
>   
>   	me_id = (entry->ring_id & 0x0c) >> 2;
>   	pipe_id = (entry->ring_id & 0x03) >> 0;