1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
new file mode 100644
index 000000000..d9953c2b2
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright 2020-2022 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <linux/anon_inodes.h>
+#include <uapi/linux/kfd_ioctl.h>
+#include "amdgpu.h"
+#include "amdgpu_vm.h"
+#include "kfd_priv.h"
+#include "kfd_smi_events.h"
+
+struct kfd_smi_client {
+	struct list_head list;
+	struct kfifo fifo;
+	wait_queue_head_t wait_queue;
+	/* events enabled */
+	uint64_t events;
+	struct kfd_node *dev;
+	spinlock_t lock;
+	struct rcu_head rcu;
+	pid_t pid;
+	bool suser;
+};
+
+#define MAX_KFIFO_SIZE	1024
+
+static __poll_t kfd_smi_ev_poll(struct file *, struct poll_table_struct *);
+static ssize_t kfd_smi_ev_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t kfd_smi_ev_write(struct file *, const char __user *, size_t,
+				loff_t *);
+static int kfd_smi_ev_release(struct inode *, struct file *);
+
+static const char kfd_smi_name[] = "kfd_smi_ev";
+
+static const struct file_operations kfd_smi_ev_fops = {
+	.owner = THIS_MODULE,
+	.poll = kfd_smi_ev_poll,
+	.read = kfd_smi_ev_read,
+	.write = kfd_smi_ev_write,
+	.release = kfd_smi_ev_release
+};
+
+static __poll_t kfd_smi_ev_poll(struct file *filep,
+				struct poll_table_struct *wait)
+{
+	struct kfd_smi_client *client = filep->private_data;
+	__poll_t mask = 0;
+
+	poll_wait(filep, &client->wait_queue, wait);
+
+	spin_lock(&client->lock);
+	if (!kfifo_is_empty(&client->fifo))
+		mask = EPOLLIN | EPOLLRDNORM;
+	spin_unlock(&client->lock);
+
+	return mask;
+}
+
+static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
+			       size_t size, loff_t *offset)
+{
+	int ret;
+	size_t to_copy;
+	struct kfd_smi_client *client = filep->private_data;
+	unsigned char *buf;
+
+	size = min_t(size_t, size, MAX_KFIFO_SIZE);
+	buf = kmalloc(size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	/* kfifo_to_user can sleep so we can't use spinlock protection around
+	 * it. Instead, we kfifo out as spinlocked then copy them to the user.
+	 */
+	spin_lock(&client->lock);
+	to_copy = kfifo_len(&client->fifo);
+	if (!to_copy) {
+		spin_unlock(&client->lock);
+		ret = -EAGAIN;
+		goto ret_err;
+	}
+	to_copy = min(size, to_copy);
+	ret = kfifo_out(&client->fifo, buf, to_copy);
+	spin_unlock(&client->lock);
+	if (ret <= 0) {
+		ret = -EAGAIN;
+		goto ret_err;
+	}
+
+	ret = copy_to_user(user, buf, to_copy);
+	if (ret) {
+		ret = -EFAULT;
+		goto ret_err;
+	}
+
+	kfree(buf);
+	return to_copy;
+
+ret_err:
+	kfree(buf);
+	return ret;
+}
+
+static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
+				size_t size, loff_t *offset)
+{
+	struct kfd_smi_client *client = filep->private_data;
+	uint64_t events;
+
+	if (!access_ok(user, size) || size < sizeof(events))
+		return -EFAULT;
+	if (copy_from_user(&events, user, sizeof(events)))
+		return -EFAULT;
+
+	WRITE_ONCE(client->events, events);
+
+	return sizeof(events);
+}
+
+static void kfd_smi_ev_client_free(struct rcu_head *p)
+{
+	struct kfd_smi_client *ev = container_of(p, struct kfd_smi_client, rcu);
+
+	kfifo_free(&ev->fifo);
+	kfree(ev);
+}
+
+static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
+{
+	struct kfd_smi_client *client = filep->private_data;
+	struct kfd_node *dev = client->dev;
+
+	spin_lock(&dev->smi_lock);
+	list_del_rcu(&client->list);
+	spin_unlock(&dev->smi_lock);
+
+	call_rcu(&client->rcu, kfd_smi_ev_client_free);
+	return 0;
+}
+
+static bool kfd_smi_ev_enabled(pid_t pid, struct kfd_smi_client *client,
+			       unsigned int event)
+{
+	uint64_t all = KFD_SMI_EVENT_MASK_FROM_INDEX(KFD_SMI_EVENT_ALL_PROCESS);
+	uint64_t events = READ_ONCE(client->events);
+
+	if (pid && client->pid != pid && !(client->suser && (events & all)))
+		return false;
+
+	return events & KFD_SMI_EVENT_MASK_FROM_INDEX(event);
+}
+
+static void add_event_to_kfifo(pid_t pid, struct kfd_node *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 (!kfd_smi_ev_enabled(pid, client, smi_event))
+			continue;
+		spin_lock(&client->lock);
+		if (kfifo_avail(&client->fifo) >= len) {
+			kfifo_in(&client->fifo, event_msg, len);
+			wake_up_all(&client->wait_queue);
+		} else {
+			pr_debug("smi_event(EventID: %u): no space left\n",
+					smi_event);
+		}
+		spin_unlock(&client->lock);
+	}
+
+	rcu_read_unlock();
+}
+
+__printf(4, 5)
+static void kfd_smi_event_add(pid_t pid, struct kfd_node *dev,
+			      unsigned int event, char *fmt, ...)
+{
+	char fifo_in[KFD_SMI_EVENT_MSG_SIZE];
+	int len;
+	va_list args;
+
+	if (list_empty(&dev->smi_clients))
+		return;
+
+	len = snprintf(fifo_in, sizeof(fifo_in), "%x ", event);
+
+	va_start(args, fmt);
+	len += vsnprintf(fifo_in + len, sizeof(fifo_in) - len, fmt, args);
+	va_end(args);
+
+	add_event_to_kfifo(pid, dev, event, fifo_in, len);
+}
+
+void kfd_smi_event_update_gpu_reset(struct kfd_node *dev, bool post_reset)
+{
+	unsigned int event;
+
+	if (post_reset) {
+		event = KFD_SMI_EVENT_GPU_POST_RESET;
+	} else {
+		event = KFD_SMI_EVENT_GPU_PRE_RESET;
+		++(dev->reset_seq_num);
+	}
+	kfd_smi_event_add(0, dev, event, "%x\n", dev->reset_seq_num);
+}
+
+void kfd_smi_event_update_thermal_throttling(struct kfd_node *dev,
+					     uint64_t throttle_bitmask)
+{
+	kfd_smi_event_add(0, dev, KFD_SMI_EVENT_THERMAL_THROTTLE, "%llx:%llx\n",
+			  throttle_bitmask,
+			  amdgpu_dpm_get_thermal_throttling_counter(dev->adev));
+}
+
+void kfd_smi_event_update_vmfault(struct kfd_node *dev, uint16_t pasid)
+{
+	struct amdgpu_task_info task_info;
+
+	memset(&task_info, 0, sizeof(struct amdgpu_task_info));
+	amdgpu_vm_get_task_info(dev->adev, pasid, &task_info);
+	/* Report VM faults from user applications, not retry from kernel */
+	if (!task_info.pid)
+		return;
+
+	kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, "%x:%s\n",
+			  task_info.pid, task_info.task_name);
+}
+
+void kfd_smi_event_page_fault_start(struct kfd_node *node, pid_t pid,
+				    unsigned long address, bool write_fault,
+				    ktime_t ts)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_START,
+			  "%lld -%d @%lx(%x) %c\n", ktime_to_ns(ts), pid,
+			  address, node->id, write_fault ? 'W' : 'R');
+}
+
+void kfd_smi_event_page_fault_end(struct kfd_node *node, pid_t pid,
+				  unsigned long address, bool migration)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_END,
+			  "%lld -%d @%lx(%x) %c\n", ktime_get_boottime_ns(),
+			  pid, address, node->id, migration ? 'M' : 'U');
+}
+
+void kfd_smi_event_migration_start(struct kfd_node *node, pid_t pid,
+				   unsigned long start, unsigned long end,
+				   uint32_t from, uint32_t to,
+				   uint32_t prefetch_loc, uint32_t preferred_loc,
+				   uint32_t trigger)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_START,
+			  "%lld -%d @%lx(%lx) %x->%x %x:%x %d\n",
+			  ktime_get_boottime_ns(), pid, start, end - start,
+			  from, to, prefetch_loc, preferred_loc, trigger);
+}
+
+void kfd_smi_event_migration_end(struct kfd_node *node, pid_t pid,
+				 unsigned long start, unsigned long end,
+				 uint32_t from, uint32_t to, uint32_t trigger)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_END,
+			  "%lld -%d @%lx(%lx) %x->%x %d\n",
+			  ktime_get_boottime_ns(), pid, start, end - start,
+			  from, to, trigger);
+}
+
+void kfd_smi_event_queue_eviction(struct kfd_node *node, pid_t pid,
+				  uint32_t trigger)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_EVICTION,
+			  "%lld -%d %x %d\n", ktime_get_boottime_ns(), pid,
+			  node->id, trigger);
+}
+
+void kfd_smi_event_queue_restore(struct kfd_node *node, pid_t pid)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_RESTORE,
+			  "%lld -%d %x\n", ktime_get_boottime_ns(), pid,
+			  node->id);
+}
+
+void kfd_smi_event_queue_restore_rescheduled(struct mm_struct *mm)
+{
+	struct kfd_process *p;
+	int i;
+
+	p = kfd_lookup_process_by_mm(mm);
+	if (!p)
+		return;
+
+	for (i = 0; i < p->n_pdds; i++) {
+		struct kfd_process_device *pdd = p->pdds[i];
+
+		kfd_smi_event_add(p->lead_thread->pid, pdd->dev,
+				  KFD_SMI_EVENT_QUEUE_RESTORE,
+				  "%lld -%d %x %c\n", ktime_get_boottime_ns(),
+				  p->lead_thread->pid, pdd->dev->id, 'R');
+	}
+	kfd_unref_process(p);
+}
+
+void kfd_smi_event_unmap_from_gpu(struct kfd_node *node, pid_t pid,
+				  unsigned long address, unsigned long last,
+				  uint32_t trigger)
+{
+	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_UNMAP_FROM_GPU,
+			  "%lld -%d @%lx(%lx) %x %d\n", ktime_get_boottime_ns(),
+			  pid, address, last - address + 1, node->id, trigger);
+}
+
+int kfd_smi_event_open(struct kfd_node *dev, uint32_t *fd)
+{
+	struct kfd_smi_client *client;
+	int ret;
+
+	client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
+	if (!client)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&client->list);
+
+	ret = kfifo_alloc(&client->fifo, MAX_KFIFO_SIZE, GFP_KERNEL);
+	if (ret) {
+		kfree(client);
+		return ret;
+	}
+
+	init_waitqueue_head(&client->wait_queue);
+	spin_lock_init(&client->lock);
+	client->events = 0;
+	client->dev = dev;
+	client->pid = current->tgid;
+	client->suser = capable(CAP_SYS_ADMIN);
+
+	spin_lock(&dev->smi_lock);
+	list_add_rcu(&client->list, &dev->smi_clients);
+	spin_unlock(&dev->smi_lock);
+
+	ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
+			       O_RDWR);
+	if (ret < 0) {
+		spin_lock(&dev->smi_lock);
+		list_del_rcu(&client->list);
+		spin_unlock(&dev->smi_lock);
+
+		synchronize_rcu();
+
+		kfifo_free(&client->fifo);
+		kfree(client);
+		return ret;
+	}
+	*fd = ret;
+
+	return 0;
+}