From: Tvrtko Ursulin <[email protected]> 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 <[email protected]> Reviewed-by: Chris Wilson <[email protected]> --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 20 +++++++++---- .../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, 40 insertions(+), 44 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 694641aa656b..b0bcfce2a1e4 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -341,13 +341,14 @@ void i915_gem_context_release(struct kref *ref) trace_i915_context_free(ctx); GEM_BUG_ON(!i915_gem_context_is_closed(ctx)); - mutex_destroy(&ctx->engines_mutex); - mutex_destroy(&ctx->lut_mutex); + if (ctx->client) + i915_drm_client_put(ctx->client); if (ctx->timeline) intel_timeline_put(ctx->timeline); - put_pid(ctx->pid); + mutex_destroy(&ctx->engines_mutex); + mutex_destroy(&ctx->lut_mutex); mutex_destroy(&ctx->mutex); kfree_rcu(ctx, rcu); @@ -878,6 +879,7 @@ 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; @@ -889,15 +891,21 @@ 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)->name, + pid_nr(rcu_dereference(client->name)->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); @@ -905,7 +913,7 @@ 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 1449f54924e0..c47bb45d2110 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -96,19 +96,12 @@ 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; + /** 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 f29487ea4528..289ee65b669a 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -333,17 +333,15 @@ 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)->name); + rcu_read_unlock(); print_file_stats(m, name, stats); @@ -1075,20 +1073,13 @@ 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)->name, + pid_nr(rcu_dereference(ctx->client->name)->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 d8cac4c5881f..e38dab8d2fed 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1238,7 +1238,9 @@ 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->name)->pid); } rcu_read_unlock(); } @@ -1259,23 +1261,25 @@ 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)->name); + e->pid = pid_nr(rcu_dereference(ctx->client->name)->pid); } + rcu_read_unlock(); e->sched_attr = ctx->sched; -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
