[PATCH 14/19] drm/i915: Move per-request pid from request to ctx
Chris Wilson
chris at chris-wilson.co.uk
Sat Aug 6 14:46:20 UTC 2016
Since contexts are not currently shared between userspace processes, we
have an exact correspondence between context creator and guilty batch
submitter. Therefore we can save some per-batch work by inspecting the
context->pid upon error instead. Note that we take the context's
creator's pid rather than the file's pid in order to better track fd
passed over sockets.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 25 ++++++++++++++++---------
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem_context.c | 4 ++++
drivers/gpu/drm/i915/i915_gem_request.c | 5 -----
drivers/gpu/drm/i915/i915_gem_request.h | 3 ---
drivers/gpu/drm/i915/i915_gpu_error.c | 13 ++++++++++---
6 files changed, 32 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7df24ea02394..17ca6d50d0fa 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -556,6 +556,8 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
print_context_stats(m, dev_priv);
list_for_each_entry_reverse(file, &dev->filelist, lhead) {
struct file_stats stats;
+ struct drm_i915_file_private *file_priv = file->driver_priv;
+ struct drm_i915_gem_request *request;
struct task_struct *task;
memset(&stats, 0, sizeof(stats));
@@ -569,10 +571,17 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
* still alive (e.g. get_pid(current) => fork() => exit()).
* Therefore, we need to protect this ->comm access using RCU.
*/
+ mutex_lock(&dev->struct_mutex);
+ request = list_first_entry_or_null(&file_priv->mm.request_list,
+ struct drm_i915_gem_request,
+ client_list);
rcu_read_lock();
- task = pid_task(file->pid, PIDTYPE_PID);
+ task = pid_task(request && request->ctx->pid ?
+ request->ctx->pid : file->pid,
+ PIDTYPE_PID);
print_file_stats(m, task ? task->comm : "<unknown>", stats);
rcu_read_unlock();
+ mutex_unlock(&dev->struct_mutex);
}
mutex_unlock(&dev->filelist_mutex);
@@ -753,12 +762,11 @@ static int i915_gem_request_info(struct seq_file *m, void *data)
seq_printf(m, "%s requests: %d\n", engine->name, count);
list_for_each_entry(req, &engine->request_list, link) {
+ struct pid *pid = req->ctx->pid;
struct task_struct *task;
rcu_read_lock();
- task = NULL;
- if (req->pid)
- task = pid_task(req->pid, PIDTYPE_PID);
+ task = pid ? pid_task(pid, PIDTYPE_PID) : NULL;
seq_printf(m, " %x @ %d: %s [%d]\n",
req->fence.seqno,
(int) (jiffies - req->emitted_jiffies),
@@ -2047,18 +2055,17 @@ static int i915_context_status(struct seq_file *m, void *unused)
list_for_each_entry(ctx, &dev_priv->context_list, link) {
seq_printf(m, "HW context %u ", ctx->hw_id);
- if (IS_ERR(ctx->file_priv)) {
- seq_puts(m, "(deleted) ");
- } else if (ctx->file_priv) {
- struct pid *pid = ctx->file_priv->file->pid;
+ if (ctx->pid) {
struct task_struct *task;
- task = get_pid_task(pid, PIDTYPE_PID);
+ task = get_pid_task(ctx->pid, PIDTYPE_PID);
if (task) {
seq_printf(m, "(%s [%d]) ",
task->comm, task->pid);
put_task_struct(task);
}
+ } else if (IS_ERR(ctx->file_priv)) {
+ seq_puts(m, "(deleted) ");
} else {
seq_puts(m, "(kernel) ");
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b183d3707488..b26f86b583a8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -560,6 +560,7 @@ struct drm_i915_error_state {
struct drm_i915_error_request {
long jiffies;
+ pid_t pid;
u32 seqno;
u32 tail;
} *requests;
@@ -880,6 +881,7 @@ struct i915_gem_context {
struct drm_i915_private *i915;
struct drm_i915_file_private *file_priv;
struct i915_hw_ppgtt *ppgtt;
+ struct pid *pid;
struct i915_ctx_hang_stats hang_stats;
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index e515050c194b..408a818c61f2 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -158,6 +158,7 @@ void i915_gem_context_free(struct kref *ctx_ref)
i915_gem_object_put(ce->state);
}
+ put_pid(ctx->pid);
list_del(&ctx->link);
ida_simple_remove(&ctx->i915->context_hw_ida, ctx->hw_id);
@@ -300,6 +301,9 @@ __create_hw_context(struct drm_device *dev,
ret = DEFAULT_CONTEXT_HANDLE;
ctx->file_priv = file_priv;
+ if (file_priv)
+ ctx->pid = get_task_pid(current, PIDTYPE_PID);
+
ctx->user_handle = ret;
/* NB: Mark all slices as needing a remap so that when the context first
* loads it will restore whatever remap state already exists. If there
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 187c4f9ce8d0..8fdd313248f9 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -137,8 +137,6 @@ int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,
list_add_tail(&req->client_list, &file_priv->mm.request_list);
spin_unlock(&file_priv->mm.lock);
- req->pid = get_pid(task_pid(current));
-
return 0;
}
@@ -154,9 +152,6 @@ i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
list_del(&request->client_list);
request->file_priv = NULL;
spin_unlock(&file_priv->mm.lock);
-
- put_pid(request->pid);
- request->pid = NULL;
}
void i915_gem_retire_noop(struct i915_gem_active *active,
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index 1f396f470a86..72a4b73cbb79 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -134,9 +134,6 @@ struct drm_i915_gem_request {
/** file_priv list entry for this request */
struct list_head client_list;
- /** process identifier submitting this request */
- struct pid *pid;
-
/**
* The ELSP only accepts two elements at a time, so we queue
* context/tail pairs on a given queue (ring->execlist_queue) until the
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 45e5a9f19468..abfbd99dae96 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -460,7 +460,8 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
dev_priv->engine[i].name,
ee->num_requests);
for (j = 0; j < ee->num_requests; j++) {
- err_printf(m, " seqno 0x%08x, emitted %ld, tail 0x%08x\n",
+ err_printf(m, " pid %d, seqno 0x%08x, emitted %ld, tail 0x%08x\n",
+ ee->requests[j].pid,
ee->requests[j].seqno,
ee->requests[j].jiffies,
ee->requests[j].tail);
@@ -1061,6 +1062,7 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
request = i915_gem_find_active_request(engine);
if (request) {
struct intel_ring *ring;
+ struct pid *pid;
ee->vm = request->ctx->ppgtt ?
&request->ctx->ppgtt->base : &ggtt->base;
@@ -1082,11 +1084,12 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
i915_error_object_create(dev_priv,
request->ctx->engine[i].vma);
- if (request->pid) {
+ pid = request->ctx->pid;
+ if (pid) {
struct task_struct *task;
rcu_read_lock();
- task = pid_task(request->pid, PIDTYPE_PID);
+ task = pid_task(pid, PIDTYPE_PID);
if (task) {
strcpy(ee->comm, task->comm);
ee->pid = task->pid;
@@ -1150,6 +1153,10 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
erq->seqno = request->fence.seqno;
erq->jiffies = request->emitted_jiffies;
erq->tail = request->postfix;
+
+ rcu_read_lock();
+ erq->pid = request->ctx ? pid_nr(request->ctx->pid) : 0;
+ rcu_read_unlock();
}
}
}
--
2.8.1
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