From 69879b3083cc5022585d1826c663c330efae4e63 Mon Sep 17 00:00:00 2001 From: Philip Yang Date: Wed, 24 Nov 2021 08:49:15 -0500 Subject: drm/amdkfd: fix svm_bo release invalid wait context warning Add svm_range_bo_unref_async to schedule work to wait for svm_bo eviction work done and then free svm_bo. __do_munmap put_page is atomic context, call svm_range_bo_unref_async to avoid warning invalid wait context. Other non atomic context call svm_range_bo_unref. Signed-off-by: Philip Yang Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 2 +- drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 31 +++++++++++++++++++++++++++---- drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 3 ++- 3 files changed, 30 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c index 48c2f2b6e217..ed5385137f48 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -549,7 +549,7 @@ static void svm_migrate_page_free(struct page *page) if (svm_bo) { pr_debug_ratelimited("ref: %d\n", kref_read(&svm_bo->kref)); - svm_range_bo_unref(svm_bo); + svm_range_bo_unref_async(svm_bo); } } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c index 7e92dcea4ce8..cb73141cc460 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c @@ -332,6 +332,8 @@ static void svm_range_bo_release(struct kref *kref) struct svm_range_bo *svm_bo; svm_bo = container_of(kref, struct svm_range_bo, kref); + pr_debug("svm_bo 0x%p\n", svm_bo); + spin_lock(&svm_bo->list_lock); while (!list_empty(&svm_bo->range_list)) { struct svm_range *prange = @@ -365,12 +367,33 @@ static void svm_range_bo_release(struct kref *kref) kfree(svm_bo); } -void svm_range_bo_unref(struct svm_range_bo *svm_bo) +static void svm_range_bo_wq_release(struct work_struct *work) { - if (!svm_bo) - return; + struct svm_range_bo *svm_bo; + + svm_bo = container_of(work, struct svm_range_bo, release_work); + svm_range_bo_release(&svm_bo->kref); +} + +static void svm_range_bo_release_async(struct kref *kref) +{ + struct svm_range_bo *svm_bo; + + svm_bo = container_of(kref, struct svm_range_bo, kref); + pr_debug("svm_bo 0x%p\n", svm_bo); + INIT_WORK(&svm_bo->release_work, svm_range_bo_wq_release); + schedule_work(&svm_bo->release_work); +} - kref_put(&svm_bo->kref, svm_range_bo_release); +void svm_range_bo_unref_async(struct svm_range_bo *svm_bo) +{ + kref_put(&svm_bo->kref, svm_range_bo_release_async); +} + +static void svm_range_bo_unref(struct svm_range_bo *svm_bo) +{ + if (svm_bo) + kref_put(&svm_bo->kref, svm_range_bo_release); } static bool diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h index 6dc91c33e80f..2f8a95e86dcb 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h @@ -48,6 +48,7 @@ struct svm_range_bo { struct work_struct eviction_work; struct svm_range_list *svms; uint32_t evicting; + struct work_struct release_work; }; enum svm_work_list_ops { @@ -195,7 +196,7 @@ void svm_range_list_lock_and_flush_work(struct svm_range_list *svms, struct mm_s */ #define KFD_IS_SVM_API_SUPPORTED(dev) ((dev)->pgmap.type != 0) -void svm_range_bo_unref(struct svm_range_bo *svm_bo); +void svm_range_bo_unref_async(struct svm_range_bo *svm_bo); #else struct kfd_process; -- cgit v1.2.3