[Intel-gfx] [PATCH 3/9] drm/i915: Make GEM contexts track DRM clients
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Mon Sep 14 13:12:50 UTC 2020
From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
If we make GEM contexts keep a reference to i915_drm_client for the whole
of their lifetime, we can consolidate the current task pid and name usage
by getting it from the client.
v2:
* Don't bother supporting selftests contexts from debugfs. (Chris)
v3:
* Trivial rebase.
v4:
* Fully initialize context before adding to the list. (Lucas)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 19 +++++++++---
.../gpu/drm/i915/gem/i915_gem_context_types.h | 13 ++-------
drivers/gpu/drm/i915/i915_debugfs.c | 29 +++++++------------
drivers/gpu/drm/i915/i915_gpu_error.c | 22 ++++++++------
4 files changed, 41 insertions(+), 42 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 5919cc5f8348..df5488998d53 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -336,8 +336,13 @@ static struct i915_gem_engines *default_engines(struct i915_gem_context *ctx)
static void i915_gem_context_free(struct i915_gem_context *ctx)
{
+ struct i915_drm_client *client = ctx->client;
+
GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
+ if (client)
+ i915_drm_client_put(client);
+
spin_lock(&ctx->i915->gem.contexts.lock);
list_del(&ctx->link);
spin_unlock(&ctx->i915->gem.contexts.lock);
@@ -348,7 +353,6 @@ static void i915_gem_context_free(struct i915_gem_context *ctx)
if (ctx->timeline)
intel_timeline_put(ctx->timeline);
- put_pid(ctx->pid);
mutex_destroy(&ctx->mutex);
kfree_rcu(ctx, rcu);
@@ -936,6 +940,7 @@ static int gem_context_register(struct i915_gem_context *ctx,
u32 *id)
{
struct drm_i915_private *i915 = ctx->i915;
+ struct i915_drm_client *client;
struct i915_address_space *vm;
int ret;
@@ -947,15 +952,21 @@ static int gem_context_register(struct i915_gem_context *ctx,
WRITE_ONCE(vm->file, fpriv); /* XXX */
mutex_unlock(&ctx->mutex);
- ctx->pid = get_task_pid(current, PIDTYPE_PID);
+ client = i915_drm_client_get(fpriv->client);
+
+ rcu_read_lock();
snprintf(ctx->name, sizeof(ctx->name), "%s[%d]",
- current->comm, pid_nr(ctx->pid));
+ rcu_dereference(client->name),
+ pid_nr(rcu_dereference(client->pid)));
+ rcu_read_unlock();
/* And finally expose ourselves to userspace via the idr */
ret = xa_alloc(&fpriv->context_xa, id, ctx, xa_limit_32b, GFP_KERNEL);
if (ret)
goto err_pid;
+ ctx->client = client;
+
spin_lock(&i915->gem.contexts.lock);
list_add_tail(&ctx->link, &i915->gem.contexts.list);
spin_unlock(&i915->gem.contexts.lock);
@@ -963,7 +974,7 @@ static int gem_context_register(struct i915_gem_context *ctx,
return 0;
err_pid:
- put_pid(fetch_and_zero(&ctx->pid));
+ i915_drm_client_put(client);
return ret;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index ae14ca24a11f..31a6a30f7ea8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -96,20 +96,13 @@ struct i915_gem_context {
*/
struct i915_address_space __rcu *vm;
- /**
- * @pid: process id of creator
- *
- * Note that who created the context may not be the principle user,
- * as the context may be shared across a local socket. However,
- * that should only affect the default context, all contexts created
- * explicitly by the client are expected to be isolated.
- */
- struct pid *pid;
-
/** link: place with &drm_i915_private.context_list */
struct list_head link;
struct llist_node free_link;
+ /** client: struct i915_drm_client */
+ struct i915_drm_client *client;
+
/**
* @ref: reference count
*
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 784219962193..1df87d9735fc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -331,17 +331,15 @@ static void print_context_stats(struct seq_file *m,
.vm = rcu_access_pointer(ctx->vm),
};
struct drm_file *file = ctx->file_priv->file;
- struct task_struct *task;
char name[80];
rcu_read_lock();
+
idr_for_each(&file->object_idr, per_file_stats, &stats);
- rcu_read_unlock();
- rcu_read_lock();
- task = pid_task(ctx->pid ?: file->pid, PIDTYPE_PID);
snprintf(name, sizeof(name), "%s",
- task ? task->comm : "<unknown>");
+ rcu_dereference(ctx->client->name));
+
rcu_read_unlock();
print_file_stats(m, name, stats);
@@ -1073,20 +1071,13 @@ static int i915_context_status(struct seq_file *m, void *unused)
spin_unlock(&i915->gem.contexts.lock);
seq_puts(m, "HW context ");
- if (ctx->pid) {
- struct task_struct *task;
-
- 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) ");
- }
+
+ rcu_read_lock();
+ seq_printf(m, "(%s [%d]) %s",
+ rcu_dereference(ctx->client->name),
+ pid_nr(rcu_dereference(ctx->client->pid)),
+ ctx->client->closed ? "(closed) " : "");
+ rcu_read_unlock();
seq_putc(m, ctx->remap_slice ? 'R' : 'r');
seq_putc(m, '\n');
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 3e6cbb0d1150..8e468942f943 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1229,7 +1229,9 @@ static void record_request(const struct i915_request *request,
ctx = rcu_dereference(request->context->gem_context);
if (ctx)
- erq->pid = pid_nr(ctx->pid);
+ erq->pid = I915_SELFTEST_ONLY(!ctx->client) ?
+ 0 :
+ pid_nr(rcu_dereference(ctx->client->pid));
}
rcu_read_unlock();
}
@@ -1250,23 +1252,25 @@ static bool record_context(struct i915_gem_context_coredump *e,
const struct i915_request *rq)
{
struct i915_gem_context *ctx;
- struct task_struct *task;
bool simulated;
rcu_read_lock();
+
ctx = rcu_dereference(rq->context->gem_context);
if (ctx && !kref_get_unless_zero(&ctx->ref))
ctx = NULL;
- rcu_read_unlock();
- if (!ctx)
+ if (!ctx) {
+ rcu_read_unlock();
return true;
+ }
- rcu_read_lock();
- task = pid_task(ctx->pid, PIDTYPE_PID);
- if (task) {
- strcpy(e->comm, task->comm);
- e->pid = task->pid;
+ if (I915_SELFTEST_ONLY(!ctx->client)) {
+ strcpy(e->comm, "[kernel]");
+ } else {
+ strcpy(e->comm, rcu_dereference(ctx->client->name));
+ e->pid = pid_nr(rcu_dereference(ctx->client->pid));
}
+
rcu_read_unlock();
e->sched_attr = ctx->sched;
--
2.25.1
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