drm/amdkfd: Add GPU recoverable fault SMI event

Use ktime_get_boottime_ns() as timestamp to correlate with other
APIs. Output timestamp when GPU recoverable fault starts and ends to
recover the fault, if migration happened or only GPU page table is
updated to recover, fault address, if read or write fault.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
index 55ed026..b7e6828 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -244,6 +244,23 @@ void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
                          task_info.pid, task_info.task_name);
 }
 
+void kfd_smi_event_page_fault_start(struct kfd_dev *dev, pid_t pid,
+                                   unsigned long address, bool write_fault,
+                                   ktime_t ts)
+{
+       kfd_smi_event_add(pid, dev, KFD_SMI_EVENT_PAGE_FAULT_START,
+                         "%lld -%d @%lx(%x) %c\n", ktime_to_ns(ts), pid,
+                         address, dev->id, write_fault ? 'W' : 'R');
+}
+
+void kfd_smi_event_page_fault_end(struct kfd_dev *dev, pid_t pid,
+                                 unsigned long address, bool migration)
+{
+       kfd_smi_event_add(pid, dev, KFD_SMI_EVENT_PAGE_FAULT_END,
+                         "%lld -%d @%lx(%x) %c\n", ktime_get_boottime_ns(),
+                         pid, address, dev->id, migration ? 'M' : 'U');
+}
+
 int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
 {
        struct kfd_smi_client *client;

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.h b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.h
index dfe101c..7903718 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.h
@@ -29,5 +29,9 @@ void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid);
 void kfd_smi_event_update_thermal_throttling(struct kfd_dev *dev,
                                             uint64_t throttle_bitmask);
 void kfd_smi_event_update_gpu_reset(struct kfd_dev *dev, bool post_reset);
-
+void kfd_smi_event_page_fault_start(struct kfd_dev *dev, pid_t pid,
+                                   unsigned long address, bool write_fault,
+                                   ktime_t ts);
+void kfd_smi_event_page_fault_end(struct kfd_dev *dev, pid_t pid,
+                                 unsigned long address, bool migration);
 #endif

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 7b33224..a3c7dd4 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -32,6 +32,7 @@
 #include "kfd_priv.h"
 #include "kfd_svm.h"
 #include "kfd_migrate.h"
+#include "kfd_smi_events.h"
 
 #ifdef dev_fmt
 #undef dev_fmt
@@ -43,7 +44,7 @@
 /* Long enough to ensure no retry fault comes after svm range is restored and
  * page table is updated.
  */
-#define AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING   2000
+#define AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING   (2UL * NSEC_PER_MSEC)
 
 struct criu_svm_metadata {
        struct list_head list;
@@ -1617,7 +1618,7 @@ unreserve_out:
        svm_range_unreserve_bos(&ctx);
 
        if (!r)
-               prange->validate_timestamp = ktime_to_us(ktime_get());
+               prange->validate_timestamp = ktime_get_boottime();
 
        return r;
 }
@@ -2694,11 +2695,12 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
        struct svm_range_list *svms;
        struct svm_range *prange;
        struct kfd_process *p;
-       uint64_t timestamp;
+       ktime_t timestamp = ktime_get_boottime();
        int32_t best_loc;
        int32_t gpuidx = MAX_GPU_INSTANCE;
        bool write_locked = false;
        struct vm_area_struct *vma;
+       bool migration = false;
        int r = 0;
 
        if (!KFD_IS_SVM_API_SUPPORTED(adev->kfd.dev)) {
@@ -2775,9 +2777,9 @@ retry_write_locked:
                goto out_unlock_range;
        }
 
-       timestamp = ktime_to_us(ktime_get()) - prange->validate_timestamp;
        /* skip duplicate vm fault on different pages of same range */
-       if (timestamp < AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING) {
+       if (ktime_before(timestamp, ktime_add_ns(prange->validate_timestamp,
+                               AMDGPU_SVM_RANGE_RETRY_FAULT_PENDING))) {
                pr_debug("svms 0x%p [0x%lx %lx] already restored\n",
                         svms, prange->start, prange->last);
                r = 0;
@@ -2813,7 +2815,11 @@ retry_write_locked:
                 svms, prange->start, prange->last, best_loc,
                 prange->actual_loc);
 
+       kfd_smi_event_page_fault_start(adev->kfd.dev, p->lead_thread->pid, addr,
+                                      write_fault, timestamp);
+
        if (prange->actual_loc != best_loc) {
+               migration = true;
                if (best_loc) {
                        r = svm_migrate_to_vram(prange, best_loc, mm);
                        if (r) {
@@ -2842,6 +2848,9 @@ retry_write_locked:
                pr_debug("failed %d to map svms 0x%p [0x%lx 0x%lx] to gpus\n",
                         r, svms, prange->start, prange->last);
 
+       kfd_smi_event_page_fault_end(adev->kfd.dev, p->lead_thread->pid, addr,
+                                    migration);
+
 out_unlock_range:
        mutex_unlock(&prange->migrate_mutex);
 out_unlock_svms:

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
index 2d54147..eab7f6d 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.h
@@ -125,7 +125,7 @@ struct svm_range {
        uint32_t                        actual_loc;
        uint8_t                         granularity;
        atomic_t                        invalid;
-       uint64_t                        validate_timestamp;
+       ktime_t                         validate_timestamp;
        struct mmu_interval_notifier    notifier;
        struct svm_work_list_item       work_item;
        struct list_head                deferred_list;