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drm/amdgpu/vcn: fix race condition issue for dpg unpause mode switch

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Couldn't only rely on enc fence to decide switching to dpg unpaude mode.
Since a enc thread may not schedule a fence in time during multiple
threads running situation.

v3: 1. Rename enc_submission_cnt to dpg_enc_submission_cnt
    2. Add dpg_enc_submission_cnt check in idle_work_handler

v4:  Remove extra counter check, and reduce counter before idle
    work schedule

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
James Zhu
2020-02-10 12:52:16 -05:00
committed by Alex Deucher
parent bd718638b8
commit e3b41d82da
2 changed files with 23 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
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@@ -65,6 +65,8 @@ int amdgpu_vcn_sw_init(struct amdgpu_device *adev)
INIT_DELAYED_WORK(&adev->vcn.idle_work, amdgpu_vcn_idle_work_handler);
mutex_init(&adev->vcn.vcn_pg_lock);
atomic_set(&adev->vcn.total_submission_cnt, 0);
for (i = 0; i < adev->vcn.num_vcn_inst; i++)
atomic_set(&adev->vcn.inst[i].dpg_enc_submission_cnt, 0);
switch (adev->asic_type) {
case CHIP_RAVEN:
@@ -298,7 +300,8 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work)
if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) {
struct dpg_pause_state new_state;
if (fence[j])
if (fence[j] ||
unlikely(atomic_read(&adev->vcn.inst[j].dpg_enc_submission_cnt)))
new_state.fw_based = VCN_DPG_STATE__PAUSE;
else
new_state.fw_based = VCN_DPG_STATE__UNPAUSE;
@@ -333,19 +336,22 @@ void amdgpu_vcn_ring_begin_use(struct amdgpu_ring *ring)
if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) {
struct dpg_pause_state new_state;
unsigned int fences = 0;
unsigned int i;
for (i = 0; i < adev->vcn.num_enc_rings; ++i) {
fences += amdgpu_fence_count_emitted(&adev->vcn.inst[ring->me].ring_enc[i]);
if (ring->funcs->type == AMDGPU_RING_TYPE_VCN_ENC) {
atomic_inc(&adev->vcn.inst[ring->me].dpg_enc_submission_cnt);
new_state.fw_based = VCN_DPG_STATE__PAUSE;
} else {
unsigned int fences = 0;
unsigned int i;
for (i = 0; i < adev->vcn.num_enc_rings; ++i)
fences += amdgpu_fence_count_emitted(&adev->vcn.inst[ring->me].ring_enc[i]);
if (fences || atomic_read(&adev->vcn.inst[ring->me].dpg_enc_submission_cnt))
new_state.fw_based = VCN_DPG_STATE__PAUSE;
else
new_state.fw_based = VCN_DPG_STATE__UNPAUSE;
}
if (fences)
new_state.fw_based = VCN_DPG_STATE__PAUSE;
else
new_state.fw_based = VCN_DPG_STATE__UNPAUSE;
if (ring->funcs->type == AMDGPU_RING_TYPE_VCN_ENC)
new_state.fw_based = VCN_DPG_STATE__PAUSE;
adev->vcn.pause_dpg_mode(adev, ring->me, &new_state);
}
@@ -354,6 +360,10 @@ void amdgpu_vcn_ring_begin_use(struct amdgpu_ring *ring)
void amdgpu_vcn_ring_end_use(struct amdgpu_ring *ring)
{
if (ring->adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG &&
ring->funcs->type == AMDGPU_RING_TYPE_VCN_ENC)
atomic_dec(&ring->adev->vcn.inst[ring->me].dpg_enc_submission_cnt);
atomic_dec(&ring->adev->vcn.total_submission_cnt);
schedule_delayed_work(&ring->adev->vcn.idle_work, VCN_IDLE_TIMEOUT);