From: Chris Wilson <chris@chris-wilson.co.uk> To: intel-gfx@lists.freedesktop.org Cc: Matthew Auld <matthew.auld@intel.com> Subject: [PATCH] drm/i915/gem: Embed context/timeline name inside the GEM context Date: Sat, 9 Nov 2019 21:02:36 +0000 [thread overview] Message-ID: <20191109210236.14573-1-chris@chris-wilson.co.uk> (raw) Use a small char buffer inside the i915_gem_context to store the user friendly name so that ctx->name has the same lifetime as the RCU protected GEM context. That is, e.g. when using print_request() that prints the timeline name (ctx->name), the name will not be prematurely freed upon the context being closed and the last reference dropped. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Matthew Auld <matthew.auld@intel.com> --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 ++---------- .../gpu/drm/i915/gem/i915_gem_context_types.h | 18 +++++++++--------- .../gpu/drm/i915/gem/selftests/mock_context.c | 4 +--- 3 files changed, 12 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 94b51b13ef17..982770e8163d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -277,9 +277,7 @@ static void i915_gem_context_free(struct i915_gem_context *ctx) if (ctx->timeline) intel_timeline_put(ctx->timeline); - kfree(ctx->name); put_pid(ctx->pid); - mutex_destroy(&ctx->mutex); kfree_rcu(ctx, rcu); @@ -789,12 +787,8 @@ static int gem_context_register(struct i915_gem_context *ctx, mutex_unlock(&ctx->mutex); ctx->pid = get_task_pid(current, PIDTYPE_PID); - ctx->name = kasprintf(GFP_KERNEL, "%s[%d]", - current->comm, pid_nr(ctx->pid)); - if (!ctx->name) { - ret = -ENOMEM; - goto err_pid; - } + snprintf(ctx->name, sizeof(ctx->name), "%s[%d]", + current->comm, pid_nr(ctx->pid)); /* And finally expose ourselves to userspace via the idr */ mutex_lock(&fpriv->context_idr_lock); @@ -803,8 +797,6 @@ static int gem_context_register(struct i915_gem_context *ctx, if (ret >= 0) goto out; - kfree(fetch_and_zero(&ctx->name)); -err_pid: put_pid(fetch_and_zero(&ctx->pid)); out: 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 861d7d92fe9f..69df5459c350 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -100,15 +100,6 @@ struct i915_gem_context { */ struct pid *pid; - /** - * @name: arbitrary name - * - * A name is constructed for the context from the creator's process - * name, pid and user handle in order to uniquely identify the - * context in messages. - */ - const char *name; - /** link: place with &drm_i915_private.context_list */ struct list_head link; struct llist_node free_link; @@ -176,6 +167,15 @@ struct i915_gem_context { * per vm, which may be one per context or shared with the global GTT) */ struct radix_tree_root handles_vma; + + /** + * @name: arbitrary name, used for user debug + * + * A name is constructed for the context from the creator's process + * name, pid and user handle in order to uniquely identify the + * context in messages. + */ + char name[TASK_COMM_LEN + 8]; }; #endif /* __I915_GEM_CONTEXT_TYPES_H__ */ diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_context.c b/drivers/gpu/drm/i915/gem/selftests/mock_context.c index cdcb006321a7..53e89efb09c0 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_context.c @@ -37,9 +37,7 @@ mock_context(struct drm_i915_private *i915, if (name) { struct i915_ppgtt *ppgtt; - ctx->name = kstrdup(name, GFP_KERNEL); - if (!ctx->name) - goto err_put; + strncpy(ctx->name, name, sizeof(ctx->name)); ppgtt = mock_ppgtt(i915, name); if (!ppgtt) -- 2.24.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
WARNING: multiple messages have this Message-ID (diff)
From: Chris Wilson <chris@chris-wilson.co.uk> To: intel-gfx@lists.freedesktop.org Cc: Matthew Auld <matthew.auld@intel.com> Subject: [Intel-gfx] [PATCH] drm/i915/gem: Embed context/timeline name inside the GEM context Date: Sat, 9 Nov 2019 21:02:36 +0000 [thread overview] Message-ID: <20191109210236.14573-1-chris@chris-wilson.co.uk> (raw) Message-ID: <20191109210236.uvR839kKogigo5rebAOdzBKXZhfvuhPMSmIlWjLaVsU@z> (raw) Use a small char buffer inside the i915_gem_context to store the user friendly name so that ctx->name has the same lifetime as the RCU protected GEM context. That is, e.g. when using print_request() that prints the timeline name (ctx->name), the name will not be prematurely freed upon the context being closed and the last reference dropped. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Matthew Auld <matthew.auld@intel.com> --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 ++---------- .../gpu/drm/i915/gem/i915_gem_context_types.h | 18 +++++++++--------- .../gpu/drm/i915/gem/selftests/mock_context.c | 4 +--- 3 files changed, 12 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 94b51b13ef17..982770e8163d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -277,9 +277,7 @@ static void i915_gem_context_free(struct i915_gem_context *ctx) if (ctx->timeline) intel_timeline_put(ctx->timeline); - kfree(ctx->name); put_pid(ctx->pid); - mutex_destroy(&ctx->mutex); kfree_rcu(ctx, rcu); @@ -789,12 +787,8 @@ static int gem_context_register(struct i915_gem_context *ctx, mutex_unlock(&ctx->mutex); ctx->pid = get_task_pid(current, PIDTYPE_PID); - ctx->name = kasprintf(GFP_KERNEL, "%s[%d]", - current->comm, pid_nr(ctx->pid)); - if (!ctx->name) { - ret = -ENOMEM; - goto err_pid; - } + snprintf(ctx->name, sizeof(ctx->name), "%s[%d]", + current->comm, pid_nr(ctx->pid)); /* And finally expose ourselves to userspace via the idr */ mutex_lock(&fpriv->context_idr_lock); @@ -803,8 +797,6 @@ static int gem_context_register(struct i915_gem_context *ctx, if (ret >= 0) goto out; - kfree(fetch_and_zero(&ctx->name)); -err_pid: put_pid(fetch_and_zero(&ctx->pid)); out: 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 861d7d92fe9f..69df5459c350 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -100,15 +100,6 @@ struct i915_gem_context { */ struct pid *pid; - /** - * @name: arbitrary name - * - * A name is constructed for the context from the creator's process - * name, pid and user handle in order to uniquely identify the - * context in messages. - */ - const char *name; - /** link: place with &drm_i915_private.context_list */ struct list_head link; struct llist_node free_link; @@ -176,6 +167,15 @@ struct i915_gem_context { * per vm, which may be one per context or shared with the global GTT) */ struct radix_tree_root handles_vma; + + /** + * @name: arbitrary name, used for user debug + * + * A name is constructed for the context from the creator's process + * name, pid and user handle in order to uniquely identify the + * context in messages. + */ + char name[TASK_COMM_LEN + 8]; }; #endif /* __I915_GEM_CONTEXT_TYPES_H__ */ diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_context.c b/drivers/gpu/drm/i915/gem/selftests/mock_context.c index cdcb006321a7..53e89efb09c0 100644 --- a/drivers/gpu/drm/i915/gem/selftests/mock_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/mock_context.c @@ -37,9 +37,7 @@ mock_context(struct drm_i915_private *i915, if (name) { struct i915_ppgtt *ppgtt; - ctx->name = kstrdup(name, GFP_KERNEL); - if (!ctx->name) - goto err_put; + strncpy(ctx->name, name, sizeof(ctx->name)); ppgtt = mock_ppgtt(i915, name); if (!ppgtt) -- 2.24.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next reply other threads:[~2019-11-09 21:03 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-09 21:02 Chris Wilson [this message] 2019-11-09 21:02 ` [Intel-gfx] [PATCH] drm/i915/gem: Embed context/timeline name inside the GEM context Chris Wilson 2019-11-09 21:47 ` ✗ Fi.CI.BAT: failure for " Patchwork 2019-11-09 21:47 ` [Intel-gfx] " Patchwork
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