<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> [AMD Official Use Only - Internal Distribution Only] <div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> ping </div> <div> <div id="Signature"> <div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="divRplyFwdMsg" dir="ltr">From: Zhu, James <James.Zhu@amd.com> Sent: Monday, March 9, 2020 12:57 PM To: amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org> Cc: Zhu, James <James.Zhu@amd.com>; Koenig, Christian <Christian.Koenig@amd.com> Subject: [PATCH v3 1/4] drm/amdgpu/vcn: fix race condition issue for vcn start <div> </div> </div> <div class="BodyFragment"> <div class="PlainText">Fix race condition issue when multiple vcn starts are called. v2: Removed checking the return value of cancel_delayed_work_sync() to prevent possible races here. v3: Add total_submission_cnt to avoid gate power unexpectedly. Signed-off-by: James Zhu <James.Zhu@amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 22 +++++++++++++++------- drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h | 2 ++ 2 files changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c index a41272f..6aafda1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c @@ -63,6 +63,8 @@ int amdgpu_vcn_sw_init(struct amdgpu_device *adev) int i, r; 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); switch (adev->asic_type) { case CHIP_RAVEN: @@ -210,6 +212,7 @@ int amdgpu_vcn_sw_fini(struct amdgpu_device *adev) } release_firmware(adev->vcn.fw); + mutex_destroy(&adev->vcn.vcn_pg_lock); return 0; } @@ -307,7 +310,8 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work) fences += fence[j]; } - if (fences == 0) { + if (fences == 0 && + likely(atomic_read(&adev->vcn.total_submission_cnt) == 0)) { amdgpu_gfx_off_ctrl(adev, true); amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN, AMD_PG_STATE_GATE); @@ -319,13 +323,14 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work) void amdgpu_vcn_ring_begin_use(struct amdgpu_ring *ring) { struct amdgpu_device *adev = ring->adev; - bool set_clocks = !cancel_delayed_work_sync(&adev->vcn.idle_work); - if (set_clocks) { - amdgpu_gfx_off_ctrl(adev, false); - amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN, - AMD_PG_STATE_UNGATE); - } + atomic_inc(&adev->vcn.total_submission_cnt); + cancel_delayed_work_sync(&adev->vcn.idle_work); + + mutex_lock(&adev->vcn.vcn_pg_lock); + amdgpu_gfx_off_ctrl(adev, false); + amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN, + AMD_PG_STATE_UNGATE); if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) { struct dpg_pause_state new_state; @@ -345,11 +350,14 @@ void amdgpu_vcn_ring_begin_use(struct amdgpu_ring *ring) adev->vcn.pause_dpg_mode(adev, ring->me, &new_state); } + mutex_unlock(&adev->vcn.vcn_pg_lock); } void amdgpu_vcn_ring_end_use(struct amdgpu_ring *ring) { schedule_delayed_work(&ring->adev->vcn.idle_work, VCN_IDLE_TIMEOUT); + if (unlikely(atomic_dec_return(&ring->adev->vcn.total_submission_cnt) < 0)) + atomic_set(&ring->adev->vcn.total_submission_cnt, 0); } int amdgpu_vcn_dec_ring_test_ring(struct amdgpu_ring *ring) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h index 6fe0573..111c4cc 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h @@ -200,6 +200,8 @@ struct amdgpu_vcn { struct drm_gpu_scheduler *vcn_dec_sched[AMDGPU_MAX_VCN_INSTANCES]; uint32_t num_vcn_enc_sched; uint32_t num_vcn_dec_sched; + struct mutex vcn_pg_lock; + atomic_t total_submission_cnt; unsigned harvest_config; int (*pause_dpg_mode)(struct amdgpu_device *adev, -- 2.7.4 </div> </div> </div> </div> </div> </div> </body> </html>