If there are multiple amdgpu devices, this list processing can be racy. We're really treating this like a per-device list, so make that explicit and remove the global list. Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 4 ++++ drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 12 +++++------- 2 files changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index 0e6ddf05c23c..e968b7f2417c 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -1063,6 +1063,10 @@ struct amdgpu_device { struct work_struct reset_work; bool job_hang; + +#if IS_ENABLED(CONFIG_PERF_EVENTS) + struct list_head pmu_list; +#endif }; static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c index 71ee361d0972..24f2055a2f23 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c @@ -23,6 +23,7 @@ #include <linux/perf_event.h> #include <linux/init.h> +#include <linux/list.h> #include "amdgpu.h" #include "amdgpu_pmu.h" @@ -72,9 +73,6 @@ static ssize_t amdgpu_pmu_event_show(struct device *dev, amdgpu_pmu_attr->event_str, amdgpu_pmu_attr->type); } -static LIST_HEAD(amdgpu_pmu_list); - - struct amdgpu_pmu_attr { const char *name; const char *config; @@ -558,7 +556,7 @@ static int init_pmu_entry_by_type_and_add(struct amdgpu_pmu_entry *pmu_entry, pr_info("Detected AMDGPU %d Perf Events.\n", total_num_events); - list_add_tail(&pmu_entry->entry, &amdgpu_pmu_list); + list_add_tail(&pmu_entry->entry, &pmu_entry->adev->pmu_list); return 0; err_register: @@ -579,9 +577,7 @@ void amdgpu_pmu_fini(struct amdgpu_device *adev) { struct amdgpu_pmu_entry *pe, *temp; - list_for_each_entry_safe(pe, temp, &amdgpu_pmu_list, entry) { - if (pe->adev != adev) - continue; + list_for_each_entry_safe(pe, temp, &adev->pmu_list, entry) { list_del(&pe->entry); perf_pmu_unregister(&pe->pmu); kfree(pe->pmu.attr_groups); @@ -623,6 +619,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev) int ret = 0; struct amdgpu_pmu_entry *pmu_entry, *pmu_entry_df; + INIT_LIST_HEAD(&adev->pmu_list); + switch (adev->asic_type) { case CHIP_VEGA20: pmu_entry_df = create_pmu_entry(adev, AMDGPU_PMU_PERF_TYPE_DF, -- 2.38.1.273.g43a17bfeac-goog