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drm/amdkfd: Enable per process SMI event

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

Event using pid 0 to send the event to all processes, to keep the
default behavior of existing SMI events.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2022-01-13 18:59:02 -05:00 committed by Alex Deucher
parent d7cfea332c
commit 163a5a5843
1 changed files with 26 additions and 11 deletions
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37
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
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@ -38,6 +38,8 @@ struct kfd_smi_client {
uint64_t events;
struct kfd_dev *dev;
spinlock_t lock;
pid_t pid;
bool suser;
};
#define MAX_KFIFO_SIZE 1024
@ -151,16 +153,27 @@ 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 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_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) {
@ -176,9 +189,9 @@ static void add_event_to_kfifo(struct kfd_dev *dev, unsigned int smi_event,
rcu_read_unlock();
}
__printf(3, 4)
static void kfd_smi_event_add(struct kfd_dev *dev, unsigned int event,
char *fmt, ...)
__printf(4, 5)
static void kfd_smi_event_add(pid_t pid, struct kfd_dev *dev,
unsigned int event, char *fmt, ...)
{
char fifo_in[KFD_SMI_EVENT_MSG_SIZE];
int len;
@ -193,7 +206,7 @@ static void kfd_smi_event_add(struct kfd_dev *dev, unsigned int event,
len += vsnprintf(fifo_in + len, sizeof(fifo_in) - len, fmt, args);
va_end(args);
add_event_to_kfifo(dev, event, fifo_in, len);
add_event_to_kfifo(pid, dev, event, fifo_in, len);
}
void kfd_smi_event_update_gpu_reset(struct kfd_dev *dev, bool post_reset)
@ -206,13 +219,13 @@ void kfd_smi_event_update_gpu_reset(struct kfd_dev *dev, bool post_reset)
event = KFD_SMI_EVENT_GPU_PRE_RESET;
++(dev->reset_seq_num);
}
kfd_smi_event_add(dev, event, "%x\n", 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_dev *dev,
uint64_t throttle_bitmask)
{
kfd_smi_event_add(dev, KFD_SMI_EVENT_THERMAL_THROTTLE, "%llx:%llx\n",
kfd_smi_event_add(0, dev, KFD_SMI_EVENT_THERMAL_THROTTLE, "%llx:%llx\n",
throttle_bitmask,
amdgpu_dpm_get_thermal_throttling_counter(dev->adev));
}
@ -227,7 +240,7 @@ void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
if (!task_info.pid)
return;
kfd_smi_event_add(dev, KFD_SMI_EVENT_VMFAULT, "%x:%s\n",
kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, "%x:%s\n",
task_info.pid, task_info.task_name);
}
@ -251,6 +264,8 @@ 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->tgid;
client->suser = capable(CAP_SYS_ADMIN);
spin_lock(&dev->smi_lock);
list_add_rcu(&client->list, &dev->smi_clients);