| Message ID | 20210428151207.1212258-20-andrey.grodzovsky@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | RFC Support hot device unplug in amdgpu | expand |
On 2021-04-28 11:11 a.m., Andrey Grodzovsky wrote: > Make sure all fecens dependent on HW present are force signaled > when handling device removal. This helpes later to scope all HW > accesing code such as IOCTLs in drm_dev_enter/exit and use > drm_dev_unplug as synchronization point past which we know HW > will not be accessed anymore outside of pci remove driver callback. > > Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + > drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 98 ++++++++++++++++++++-- > drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 6 ++ > drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 12 +-- > 4 files changed, 103 insertions(+), 15 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h > index 0db0ba4fba89..df6c5ed676b1 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h > @@ -1374,6 +1374,8 @@ void amdgpu_pci_resume(struct pci_dev *pdev); > bool amdgpu_device_cache_pci_state(struct pci_dev *pdev); > bool amdgpu_device_load_pci_state(struct pci_dev *pdev); > > +void amdgpu_finilize_device_fences(struct drm_device *dev); > + > #include "amdgpu_object.h" > > static inline bool amdgpu_is_tmz(struct amdgpu_device *adev) > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c > index 33e8e9e1d1fe..55afc11c17e6 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c > @@ -3692,15 +3692,12 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev) > amdgpu_virt_fini_data_exchange(adev); > } > > - /* disable all interrupts */ > - amdgpu_irq_disable_all(adev); > if (adev->mode_info.mode_config_initialized){ > if (!amdgpu_device_has_dc_support(adev)) > drm_helper_force_disable_all(adev_to_drm(adev)); > else > drm_atomic_helper_shutdown(adev_to_drm(adev)); > } > - amdgpu_fence_driver_fini_hw(adev); > > if (adev->pm_sysfs_en) > amdgpu_pm_sysfs_fini(adev); > @@ -4567,14 +4564,19 @@ static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, > return true; > } > > -static void amdgpu_device_unlock_adev(struct amdgpu_device *adev) > +static void amdgpu_device_unlock_adev_imp(struct amdgpu_device *adev, bool skip_in_gpu_reset) > { > amdgpu_vf_error_trans_all(adev); > adev->mp1_state = PP_MP1_STATE_NONE; > - atomic_set(&adev->in_gpu_reset, 0); > + !skip_in_gpu_reset ? atomic_set(&adev->in_gpu_reset, 0) : 0; > up_write(&adev->reset_sem); > } > > +static void amdgpu_device_unlock_adev(struct amdgpu_device *adev) > +{ > + amdgpu_device_unlock_adev_imp(adev, false); > +} > + > /* > * to lockup a list of amdgpu devices in a hive safely, if not a hive > * with multiple nodes, it will be similar as amdgpu_device_lock_adev. > @@ -5321,3 +5323,89 @@ bool amdgpu_device_load_pci_state(struct pci_dev *pdev) > } > > > +static void amdgpu_finilize_schedulded_fences(struct amdgpu_ctx_mgr *mgr) > +{ > + struct amdgpu_ctx *ctx; > + struct idr *idp; > + uint32_t id, i, j; > + > + idp = &mgr->ctx_handles; > + > + idr_for_each_entry(idp, ctx, id) { > + for (i = 0; i < AMDGPU_HW_IP_NUM; ++i) { > + for (j = 0; j < amdgpu_ctx_num_entities[i]; ++j) { > + struct drm_sched_entity *entity; > + > + if (!ctx->entities[i][j]) > + continue; > + > + entity = &ctx->entities[i][j]->entity; > + drm_sched_entity_kill_jobs(entity); > + } > + } > + } > +} > + > +/** > + * amdgpu_finilize_device_fences() - Finilize all device fences > + * @pdev: pointer to PCI device > + * > + * Will disable and finilise ISRs and will signal all fences > + * that might hang if HW is gone > + */ > +void amdgpu_finilize_device_fences(struct drm_device *dev) > +{ > + struct amdgpu_device *adev = drm_to_adev(dev); > + struct drm_file *file; > + > + /* > + * Block TDRs from further execution by setting adev->in_gpu_reset > + * instead of holding full reset lock in order to not deadlock > + * further ahead against any thread locking the reset lock when we > + * wait for it's completion > + */ > + while (!amdgpu_device_lock_adev(adev, NULL)) > + amdgpu_cancel_all_tdr(adev); > + amdgpu_device_unlock_adev_imp(adev, true); > + > + > + /* disable all HW interrupts */ > + amdgpu_irq_disable_all(adev); > + > + /* stop and flush all in flight HW interrupts handlers */ > + disable_irq(pci_irq_vector(adev->pdev, 0)); > + > + /* > + * Stop SW GPU schedulers and force completion on all HW fences. Since > + * in the prev. step all ISRs were disabled and completed the > + * HW fence array is idle (no insertions or extractions) and so it's > + * safe to iterate it bellow. > + * After this step all HW fences in the system are signaled. As a result > + * also all the scheduler 'finished' fences are also signaled. > + */ > + amdgpu_fence_driver_fini_hw(adev); > + > + /* > + * Reject any further jobs to any scheduler entity queue. After this > + * step no new insertions and because schedulers are stopped also no > + * new extractions. > + */ > + down_read(&adev->sched_fence_completion_sem); > + adev->stop_job_submissions = true; > + up_read(&adev->sched_fence_completion_sem); FYI: Typo here - down_write and up_write obviously. Andrey > + > + /* > + * Complete all scheduler 'scheduled' fences currently pending. > + * It's OK if new contexts and sched entities are concurrently > + * still created as they will fail in pushing jobs to SW queues > + * and their schedule fences will be signaled with error > + */ > + mutex_lock(&adev->ddev.filelist_mutex); > + list_for_each_entry(file, &adev->ddev.filelist, lhead) { > + struct amdgpu_fpriv *fpriv = file->driver_priv; > + amdgpu_finilize_schedulded_fences(&fpriv->ctx_mgr); > + } > + mutex_unlock(&adev->ddev.filelist_mutex); > +} > + > + > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > index f799c40d7e72..8a19b8dd02ee 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > @@ -1249,6 +1249,12 @@ amdgpu_pci_remove(struct pci_dev *pdev) > { > struct drm_device *dev = pci_get_drvdata(pdev); > > + /* > + * Force completion of all device related fences that might hang us when > + * synchronizing SRCU in the following step. > + */ > + amdgpu_finilize_device_fences(dev); > + > drm_dev_unplug(dev); > amdgpu_driver_unload_kms(dev); > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c > index 2670201e78d3..af592b28cd35 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c > @@ -526,7 +526,7 @@ int amdgpu_fence_driver_init(struct amdgpu_device *adev) > */ > void amdgpu_fence_driver_fini_hw(struct amdgpu_device *adev) > { > - int i, r; > + int i; > > for (i = 0; i < AMDGPU_MAX_RINGS; i++) { > struct amdgpu_ring *ring = adev->rings[i]; > @@ -535,18 +535,10 @@ void amdgpu_fence_driver_fini_hw(struct amdgpu_device *adev) > continue; > > /* Stop any new job submissions from sched before flushing the ring */ > - /* TODO Handle amdgpu_job_submit_direct and amdgpu_amdkfd_submit_ib */ > if (!ring->no_scheduler) > drm_sched_fini(&ring->sched); > > - /* You can't wait for HW to signal if it's gone */ > - if (!drm_dev_is_unplugged(&adev->ddev)) > - r = amdgpu_fence_wait_empty(ring); > - else > - r = -ENODEV; > - /* no need to trigger GPU reset as we are unloading */ > - if (r) > - amdgpu_fence_driver_force_completion(ring); > + amdgpu_fence_driver_force_completion(ring); > > if (ring->fence_drv.irq_src) > amdgpu_irq_put(adev, ring->fence_drv.irq_src, >
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 0db0ba4fba89..df6c5ed676b1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -1374,6 +1374,8 @@ void amdgpu_pci_resume(struct pci_dev *pdev); bool amdgpu_device_cache_pci_state(struct pci_dev *pdev); bool amdgpu_device_load_pci_state(struct pci_dev *pdev); +void amdgpu_finilize_device_fences(struct drm_device *dev); + #include "amdgpu_object.h" static inline bool amdgpu_is_tmz(struct amdgpu_device *adev) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 33e8e9e1d1fe..55afc11c17e6 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -3692,15 +3692,12 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev) amdgpu_virt_fini_data_exchange(adev); } - /* disable all interrupts */ - amdgpu_irq_disable_all(adev); if (adev->mode_info.mode_config_initialized){ if (!amdgpu_device_has_dc_support(adev)) drm_helper_force_disable_all(adev_to_drm(adev)); else drm_atomic_helper_shutdown(adev_to_drm(adev)); } - amdgpu_fence_driver_fini_hw(adev); if (adev->pm_sysfs_en) amdgpu_pm_sysfs_fini(adev); @@ -4567,14 +4564,19 @@ static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, return true; } -static void amdgpu_device_unlock_adev(struct amdgpu_device *adev) +static void amdgpu_device_unlock_adev_imp(struct amdgpu_device *adev, bool skip_in_gpu_reset) { amdgpu_vf_error_trans_all(adev); adev->mp1_state = PP_MP1_STATE_NONE; - atomic_set(&adev->in_gpu_reset, 0); + !skip_in_gpu_reset ? atomic_set(&adev->in_gpu_reset, 0) : 0; up_write(&adev->reset_sem); } +static void amdgpu_device_unlock_adev(struct amdgpu_device *adev) +{ + amdgpu_device_unlock_adev_imp(adev, false); +} + /* * to lockup a list of amdgpu devices in a hive safely, if not a hive * with multiple nodes, it will be similar as amdgpu_device_lock_adev. @@ -5321,3 +5323,89 @@ bool amdgpu_device_load_pci_state(struct pci_dev *pdev) } +static void amdgpu_finilize_schedulded_fences(struct amdgpu_ctx_mgr *mgr) +{ + struct amdgpu_ctx *ctx; + struct idr *idp; + uint32_t id, i, j; + + idp = &mgr->ctx_handles; + + idr_for_each_entry(idp, ctx, id) { + for (i = 0; i < AMDGPU_HW_IP_NUM; ++i) { + for (j = 0; j < amdgpu_ctx_num_entities[i]; ++j) { + struct drm_sched_entity *entity; + + if (!ctx->entities[i][j]) + continue; + + entity = &ctx->entities[i][j]->entity; + drm_sched_entity_kill_jobs(entity); + } + } + } +} + +/** + * amdgpu_finilize_device_fences() - Finilize all device fences + * @pdev: pointer to PCI device + * + * Will disable and finilise ISRs and will signal all fences + * that might hang if HW is gone + */ +void amdgpu_finilize_device_fences(struct drm_device *dev) +{ + struct amdgpu_device *adev = drm_to_adev(dev); + struct drm_file *file; + + /* + * Block TDRs from further execution by setting adev->in_gpu_reset + * instead of holding full reset lock in order to not deadlock + * further ahead against any thread locking the reset lock when we + * wait for it's completion + */ + while (!amdgpu_device_lock_adev(adev, NULL)) + amdgpu_cancel_all_tdr(adev); + amdgpu_device_unlock_adev_imp(adev, true); + + + /* disable all HW interrupts */ + amdgpu_irq_disable_all(adev); + + /* stop and flush all in flight HW interrupts handlers */ + disable_irq(pci_irq_vector(adev->pdev, 0)); + + /* + * Stop SW GPU schedulers and force completion on all HW fences. Since + * in the prev. step all ISRs were disabled and completed the + * HW fence array is idle (no insertions or extractions) and so it's + * safe to iterate it bellow. + * After this step all HW fences in the system are signaled. As a result + * also all the scheduler 'finished' fences are also signaled. + */ + amdgpu_fence_driver_fini_hw(adev); + + /* + * Reject any further jobs to any scheduler entity queue. After this + * step no new insertions and because schedulers are stopped also no + * new extractions. + */ + down_read(&adev->sched_fence_completion_sem); + adev->stop_job_submissions = true; + up_read(&adev->sched_fence_completion_sem); + + /* + * Complete all scheduler 'scheduled' fences currently pending. + * It's OK if new contexts and sched entities are concurrently + * still created as they will fail in pushing jobs to SW queues + * and their schedule fences will be signaled with error + */ + mutex_lock(&adev->ddev.filelist_mutex); + list_for_each_entry(file, &adev->ddev.filelist, lhead) { + struct amdgpu_fpriv *fpriv = file->driver_priv; + amdgpu_finilize_schedulded_fences(&fpriv->ctx_mgr); + } + mutex_unlock(&adev->ddev.filelist_mutex); +} + + diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index f799c40d7e72..8a19b8dd02ee 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -1249,6 +1249,12 @@ amdgpu_pci_remove(struct pci_dev *pdev) { struct drm_device *dev = pci_get_drvdata(pdev); + /* + * Force completion of all device related fences that might hang us when + * synchronizing SRCU in the following step. + */ + amdgpu_finilize_device_fences(dev); + drm_dev_unplug(dev); amdgpu_driver_unload_kms(dev); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 2670201e78d3..af592b28cd35 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -526,7 +526,7 @@ int amdgpu_fence_driver_init(struct amdgpu_device *adev) */ void amdgpu_fence_driver_fini_hw(struct amdgpu_device *adev) { - int i, r; + int i; for (i = 0; i < AMDGPU_MAX_RINGS; i++) { struct amdgpu_ring *ring = adev->rings[i]; @@ -535,18 +535,10 @@ void amdgpu_fence_driver_fini_hw(struct amdgpu_device *adev) continue; /* Stop any new job submissions from sched before flushing the ring */ - /* TODO Handle amdgpu_job_submit_direct and amdgpu_amdkfd_submit_ib */ if (!ring->no_scheduler) drm_sched_fini(&ring->sched); - /* You can't wait for HW to signal if it's gone */ - if (!drm_dev_is_unplugged(&adev->ddev)) - r = amdgpu_fence_wait_empty(ring); - else - r = -ENODEV; - /* no need to trigger GPU reset as we are unloading */ - if (r) - amdgpu_fence_driver_force_completion(ring); + amdgpu_fence_driver_force_completion(ring); if (ring->fence_drv.irq_src) amdgpu_irq_put(adev, ring->fence_drv.irq_src,
Make sure all fecens dependent on HW present are force signaled when handling device removal. This helpes later to scope all HW accesing code such as IOCTLs in drm_dev_enter/exit and use drm_dev_unplug as synchronization point past which we know HW will not be accessed anymore outside of pci remove driver callback. Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 + drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 98 ++++++++++++++++++++-- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 6 ++ drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 12 +-- 4 files changed, 103 insertions(+), 15 deletions(-)