[PATCH v3 4/8] drm/amdkfd: Add GPU recoverable fault SMI event
Philip Yang
Philip.Yang at amd.com
Tue Feb 15 21:22:43 UTC 2022
Output timestamp when GPU recoverable fault starts and ends to recover
the fault, if migration happened or only GPU page table is updated,
fault address, if read or write fault.
Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 36 +++++++++++++++++++++
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.h | 6 +++-
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 21 ++++++++----
drivers/gpu/drm/amd/amdkfd/kfd_svm.h | 2 +-
4 files changed, 57 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
index 6b743068057d..c5ed0f2dad45 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -267,6 +267,42 @@ void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
add_event_to_kfifo(0, dev, KFD_SMI_EVENT_VMFAULT, fifo_in, len);
}
+void kfd_smi_event_page_fault_start(struct kfd_dev *dev, pid_t pid,
+ unsigned long address, bool write_fault,
+ ktime_t ts)
+{
+ char fifo_in[KFD_SMI_EVENT_MSG_SIZE];
+ int len;
+
+ if (list_empty(&dev->smi_clients))
+ return;
+
+ len = snprintf(fifo_in, sizeof(fifo_in), "%x %lld -%d @%lx(%x) %c\n",
+ KFD_SMI_EVENT_PAGE_FAULT_START, ktime_to_ns(ts), pid,
+ address, dev->id, write_fault ? 'W' : 'R');
+
+ add_event_to_kfifo(pid, dev, KFD_SMI_EVENT_PAGE_FAULT_START, fifo_in,
+ len);
+}
+
+void kfd_smi_event_page_fault_end(struct kfd_dev *dev, pid_t pid,
+ unsigned long address, bool migration)
+{
+ char fifo_in[KFD_SMI_EVENT_MSG_SIZE];
+ int len;
+
+ if (list_empty(&dev->smi_clients))
+ return;
+
+ len = snprintf(fifo_in, sizeof(fifo_in),
+ "%x %lld -%d @%lx(%x) %c\n",
+ KFD_SMI_EVENT_PAGE_FAULT_END, ktime_get_boottime_ns(),
+ pid, address, dev->id, migration ? 'M' : 'U');
+
+ add_event_to_kfifo(pid, dev, KFD_SMI_EVENT_PAGE_FAULT_END, fifo_in,
+ len);
+}
+
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 dfe101c21166..7903718cd9eb 100644
--- 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 b71d47afd243..c6ea52340abc 100644
--- 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
@@ -41,9 +42,9 @@
#define AMDGPU_SVM_RANGE_RESTORE_DELAY_MS 1
/* Long enough to ensure no retry fault comes after svm range is restored and
- * page table is updated.
+ * page table is updated, 2ms is safe to let fault of same range go.
*/
-#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;
@@ -1597,7 +1598,7 @@ static int svm_range_validate_and_map(struct mm_struct *mm,
svm_range_unreserve_bos(&ctx);
if (!r)
- prange->validate_timestamp = ktime_to_us(ktime_get());
+ prange->validate_timestamp = ktime_get_boottime();
return r;
}
@@ -2666,11 +2667,12 @@ 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)) {
@@ -2746,9 +2748,9 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
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;
@@ -2784,7 +2786,11 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
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) {
@@ -2813,6 +2819,9 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
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 66c77f00ac3e..c5712f56560f 100644
--- 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;
--
2.17.1
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