// 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"
#include "amdgpu_reset.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,
struct amdgpu_reset_context *reset_context)
{
unsigned int event;
char reset_cause[64];
if (post_reset) {
event = KFD_SMI_EVENT_GPU_POST_RESET;
} else {
event = KFD_SMI_EVENT_GPU_PRE_RESET;
++(dev->reset_seq_num);
}
memset(reset_cause, 0, sizeof(reset_cause));
if (reset_context)
amdgpu_reset_get_desc(reset_context, reset_cause,
sizeof(reset_cause));
kfd_smi_event_add(0, dev, event, KFD_EVENT_FMT_UPDATE_GPU_RESET(
dev->reset_seq_num, reset_cause));
}
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, KFD_EVENT_FMT_THERMAL_THROTTLING(
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;
task_info = amdgpu_vm_get_task_info_pasid(dev->adev, pasid);
if (task_info) {
/* Report VM faults from user applications, not retry from kernel */
if (task_info->pid)
kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, KFD_EVENT_FMT_VMFAULT(
task_info->pid, task_info->task_name));
amdgpu_vm_put_task_info(task_info);
}
}
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,
KFD_EVENT_FMT_PAGEFAULT_START(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,
KFD_EVENT_FMT_PAGEFAULT_END(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,
KFD_EVENT_FMT_MIGRATE_START(
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,
KFD_EVENT_FMT_MIGRATE_END(
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,
KFD_EVENT_FMT_QUEUE_EVICTION(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,
KFD_EVENT_FMT_QUEUE_RESTORE(ktime_get_boottime_ns(), pid,
node->id, 0));
}
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,
KFD_EVENT_FMT_QUEUE_RESTORE(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,
KFD_EVENT_FMT_UNMAP_FROM_GPU(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;
}
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