[PATCH 2/5] drm/amdkfd: enable per process SMI event

[Philip Yang]

Process receive event log from same process by default. Add a flag to
be able to receive event log from all processes, this requires super
user permission.

Event log with pid 0 send to all processes.

Define new event log id, migration trigger, user queue eviction
trigger, those new event log will be added in following patches.

Update kfd_ioctl.h version.

Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 28 +++++++++++++++------
 include/uapi/linux/kfd_ioctl.h              | 27 ++++++++++++++++++++
 2 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
index 7023fa21a0a9..5818ea8ad4ce 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -37,6 +37,8 @@ struct kfd_smi_client {
 	uint64_t events;
 	struct kfd_dev *dev;
 	spinlock_t lock;
+	pid_t pid;
+	bool suser;
 };
 
 #define MAX_KFIFO_SIZE	1024
@@ -150,16 +152,26 @@ static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
 	return 0;
 }
 
-static void add_event_to_kfifo(struct kfd_dev *dev, unsigned int smi_event,
-			      char *event_msg, int len)
+static bool kfd_smi_ev_enabled(pid_t pid, struct kfd_smi_client *client,
+			       unsigned int smi_event)
+{
+	if (pid &&
+	    !(client->suser && client->events & KFD_SMI_EVENT_MASK_FROM_INDEX(KFD_SMI_EVENT_ALL_PROCESSES)) &&
+	    client->pid != pid)
+		return false;
+
+	return client->events & KFD_SMI_EVENT_MASK_FROM_INDEX(smi_event);
+}
+
+static void add_event_to_kfifo(pid_t pid, struct kfd_dev *dev,
+			       unsigned int smi_event, char *event_msg, int len)
 {
 	struct kfd_smi_client *client;
 
 	rcu_read_lock();
 
 	list_for_each_entry_rcu(client, &dev->smi_clients, list) {
-		if (!(READ_ONCE(client->events) &
-				KFD_SMI_EVENT_MASK_FROM_INDEX(smi_event)))
+		if (!kfd_smi_ev_enabled(pid, client, smi_event))
 			continue;
 		spin_lock(&client->lock);
 		if (kfifo_avail(&client->fifo) >= len) {
@@ -202,7 +214,7 @@ void kfd_smi_event_update_gpu_reset(struct kfd_dev *dev, bool post_reset)
 	len = snprintf(fifo_in, sizeof(fifo_in), "%x %x\n", event,
 						dev->reset_seq_num);
 
-	add_event_to_kfifo(dev, event, fifo_in, len);
+	add_event_to_kfifo(0, dev, event, fifo_in, len);
 }
 
 void kfd_smi_event_update_thermal_throttling(struct kfd_dev *dev,
@@ -225,7 +237,7 @@ void kfd_smi_event_update_thermal_throttling(struct kfd_dev *dev,
 		       KFD_SMI_EVENT_THERMAL_THROTTLE, throttle_bitmask,
 		       amdgpu_dpm_get_thermal_throttling_counter(dev->adev));
 
-	add_event_to_kfifo(dev, KFD_SMI_EVENT_THERMAL_THROTTLE,	fifo_in, len);
+	add_event_to_kfifo(0, dev, KFD_SMI_EVENT_THERMAL_THROTTLE, fifo_in, len);
 }
 
 void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
@@ -250,7 +262,7 @@ void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
 	len = snprintf(fifo_in, sizeof(fifo_in), "%x %x:%s\n", KFD_SMI_EVENT_VMFAULT,
 		task_info.pid, task_info.task_name);
 
-	add_event_to_kfifo(dev, KFD_SMI_EVENT_VMFAULT, fifo_in, len);
+	add_event_to_kfifo(task_info.pid, dev, KFD_SMI_EVENT_VMFAULT, fifo_in, len);
 }
 
 int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
@@ -282,6 +294,8 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
 	spin_lock_init(&client->lock);
 	client->events = 0;
 	client->dev = dev;
+	client->pid = current->pid;
+	client->suser = capable(CAP_SYS_ADMIN);
 
 	spin_lock(&dev->smi_lock);
 	list_add_rcu(&client->list, &dev->smi_clients);
diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index af96af174dc4..bbbae8ad9721 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -32,6 +32,7 @@
  * - 1.4 - Indicate new SRAM EDC bit in device properties
  * - 1.5 - Add SVM API
  * - 1.6 - Query clear flags in SVM get_attr API
+ * - 1.7 - Add SMI profiler event log
  */
 #define KFD_IOCTL_MAJOR_VERSION 1
 #define KFD_IOCTL_MINOR_VERSION 6
@@ -459,10 +460,36 @@ enum kfd_smi_event {
 	KFD_SMI_EVENT_THERMAL_THROTTLE = 2,
 	KFD_SMI_EVENT_GPU_PRE_RESET = 3,
 	KFD_SMI_EVENT_GPU_POST_RESET = 4,
+	KFD_SMI_EVENT_MIGRATION = 5,
+	KFD_SMI_EVENT_PAGE_FAULT = 6,
+	KFD_SMI_EVENT_QUEUE_EVICTION = 7,
+	KFD_SMI_EVENT_QUEUE_EVICTION_RESTORE = 8,
+
+	/*
+	 * max event number, as a flag bit to get events from all processes,
+	 * this requires super user permission, otherwise will not be able to
+	 * receive events from any process. Without this flag to receive events
+	 * from same process.
+	 */
+	KFD_SMI_EVENT_ALL_PROCESSES = 64
 };
 
 #define KFD_SMI_EVENT_MASK_FROM_INDEX(i) (1ULL << ((i) - 1))
 
+enum KFD_MIGRATION_TRIGGER {
+	MIGRATION_TRIGGER_PREFETCH = 1,
+	MIGRATION_TRIGGER_PAGEFAULT,
+	MIGRATION_TRIGGER_PAGEFAULT_CPU,
+	MIGRATION_TRIGGER_TTM_EVICTION
+};
+
+enum KFD_USER_QUEUE_EVICTION_TRIGGER {
+	SVM_RANGE_EVICTION = 1,
+	USERPTR_EVICTION,
+	TTM_EVICTION,
+	SUSPEND_EVICTION
+};
+
 struct kfd_ioctl_smi_events_args {
 	__u32 gpuid;	/* to KFD */
 	__u32 anon_fd;	/* from KFD */
-- 
2.17.1