--- /dev/null
+/*
+ * Copyright 2020 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_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_dev *dev;
+ spinlock_t lock;
+};
+
+#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[MAX_KFIFO_SIZE];
+
+ BUILD_BUG_ON(MAX_KFIFO_SIZE > 1024);
+
+ /* 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);
+ return -EAGAIN;
+ }
+ to_copy = min3(size, sizeof(buf), to_copy);
+ ret = kfifo_out(&client->fifo, buf, to_copy);
+ spin_unlock(&client->lock);
+ if (ret <= 0)
+ return -EAGAIN;
+
+ ret = copy_to_user(user, buf, to_copy);
+ if (ret)
+ return -EFAULT;
+
+ return to_copy;
+}
+
+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 int kfd_smi_ev_release(struct inode *inode, struct file *filep)
+{
+ struct kfd_smi_client *client = filep->private_data;
+ struct kfd_dev *dev = client->dev;
+
+ spin_lock(&dev->smi_lock);
+ list_del_rcu(&client->list);
+ spin_unlock(&dev->smi_lock);
+
+ synchronize_rcu();
+ kfifo_free(&client->fifo);
+ kfree(client);
+
+ return 0;
+}
+
+void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
+ struct amdgpu_task_info task_info;
+ /* VmFault msg = (hex)uint32_pid(8) + :(1) + task name(16) = 25 */
+ /* 16 bytes event + 1 byte space + 25 bytes msg + 1 byte \n = 43
+ */
+ char fifo_in[43];
+ struct kfd_smi_client *client;
+ int len;
+
+ if (list_empty(&dev->smi_clients))
+ return;
+
+ memset(&task_info, 0, sizeof(struct amdgpu_task_info));
+ amdgpu_vm_get_task_info(adev, pasid, &task_info);
+ /* Report VM faults from user applications, not retry from kernel */
+ if (!task_info.pid)
+ return;
+
+ len = snprintf(fifo_in, 43, "%x %x:%s\n", KFD_SMI_EVENT_VMFAULT,
+ task_info.pid, task_info.task_name);
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(client, &dev->smi_clients, list) {
+ if (!(READ_ONCE(client->events) & KFD_SMI_EVENT_VMFAULT))
+ continue;
+ spin_lock(&client->lock);
+ if (kfifo_avail(&client->fifo) >= len) {
+ kfifo_in(&client->fifo, fifo_in, len);
+ wake_up_all(&client->wait_queue);
+ }
+ else
+ pr_debug("smi_event(vmfault): no space left\n");
+ spin_unlock(&client->lock);
+ }
+
+ rcu_read_unlock();
+}
+
+int kfd_smi_event_open(struct kfd_dev *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;
+ }
+
+ ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
+ O_RDWR);
+ if (ret < 0) {
+ kfifo_free(&client->fifo);
+ kfree(client);
+ return ret;
+ }
+ *fd = ret;
+
+ init_waitqueue_head(&client->wait_queue);
+ spin_lock_init(&client->lock);
+ client->events = 0;
+ client->dev = dev;
+
+ spin_lock(&dev->smi_lock);
+ list_add_rcu(&client->list, &dev->smi_clients);
+ spin_unlock(&dev->smi_lock);
+
+ return 0;
+}
--- /dev/null
+/*
+ * Copyright 2020 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.
+ */
+
+#ifndef KFD_SMI_EVENTS_H_INCLUDED
+#define KFD_SMI_EVENTS_H_INCLUDED
+
+int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd);
+void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid);
+
+#endif
projects / nvme.git / commitdiff