[Intel-gfx] [RFC v2 1/8] drm: provide management functions for drm_file
From: David Herrmann
Rather than doing drm_file allocation/destruction right in the fops, lets
provide separate helpers. This decouples drm_file management from the
still-mandatory drm-fops. It prepares for use of drm_file without the
fops, both by possible separate fops implementations and APIs (not that I
am aware of any such plans), and more importantly from in-kernel use where
no real file is available.
Signed-off-by: David Herrmann
[rebased]
Signed-off-by: Noralf Trønnes
---
drivers/gpu/drm/drm_file.c | 309 +++--
drivers/gpu/drm/drm_internal.h | 2 +
2 files changed, 179 insertions(+), 132 deletions(-)
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index b3c6e997ccdb..d208faade27e 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -101,6 +101,179 @@ DEFINE_MUTEX(drm_global_mutex);
static int drm_open_helper(struct file *filp, struct drm_minor *minor);
+/**
+ * drm_file_alloc - allocate file context
+ * @minor: minor to allocate on
+ *
+ * This allocates a new DRM file context. It is not linked into any context and
+ * can be used by the caller freely. Note that the context keeps a pointer to
+ * @minor, so it must be freed before @minor is.
+ *
+ * The legacy paths might require the drm_global_mutex to be held.
+ *
+ * RETURNS:
+ * Pointer to newly allocated context, ERR_PTR on failure.
+ */
+struct drm_file *drm_file_alloc(struct drm_minor *minor)
+{
+ struct drm_device *dev = minor->dev;
+ struct drm_file *file;
+ int ret;
+
+ file = kzalloc(sizeof(*file), GFP_KERNEL);
+ if (!file)
+ return ERR_PTR(-ENOMEM);
+
+ file->pid = get_pid(task_pid(current));
+ file->minor = minor;
+
+ /* for compatibility root is always authenticated */
+ file->authenticated = capable(CAP_SYS_ADMIN);
+ file->lock_count = 0;
+
+ INIT_LIST_HEAD(&file->lhead);
+ INIT_LIST_HEAD(&file->fbs);
+ mutex_init(&file->fbs_lock);
+ INIT_LIST_HEAD(&file->blobs);
+ INIT_LIST_HEAD(&file->pending_event_list);
+ INIT_LIST_HEAD(&file->event_list);
+ init_waitqueue_head(&file->event_wait);
+ file->event_space = 4096; /* set aside 4k for event buffer */
+
+ mutex_init(&file->event_read_lock);
+
+ if (drm_core_check_feature(dev, DRIVER_GEM))
+ drm_gem_open(dev, file);
+
+ if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+ drm_syncobj_open(file);
+
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ drm_prime_init_file_private(&file->prime);
+
+ if (dev->driver->open) {
+ ret = dev->driver->open(dev, file);
+ if (ret < 0)
+ goto out_prime_destroy;
+ }
+
+ if (drm_is_primary_client(file)) {
+ ret = drm_master_open(file);
+ if (ret)
+ goto out_close;
+ }
+
+ return file;
+
+out_close:
+ if (dev->driver->postclose)
+ dev->driver->postclose(dev, file);
+out_prime_destroy:
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ drm_prime_destroy_file_private(&file->prime);
+ if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+ drm_syncobj_release(file);
+ if (drm_core_check_feature(dev, DRIVER_GEM))
+ drm_gem_release(dev, file);
+ put_pid(file->pid);
+ kfree(file);
+
+ return ERR_PTR(ret);
+}
+
+static void drm_events_release(struct drm_file *file_priv)
+{
+ struct drm_device *dev = file_priv->minor->dev;
+ struct drm_pending_event *e, *et;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+
+ /* Unlink pending events */
+ list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
+pending_link) {
+ list_del(&e->pending_link);
+ e->file_priv = NULL;
+ }
+
+ /* Remove unconsumed events */
+ list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
+ list_del(&e->link);
+ kfree(e);
+ }
+
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+/**
+ * drm_file_free - free file context
+ * @file: context to free, or NULL
+ *
+ * This destroys and deallocates a DRM file context previously allocated via
+ * drm_file_alloc(). The caller must make sure to unlink it from any contexts
+ * before calling this.
+ *
+ * The legacy paths might require the drm_global_mutex to be held.
+ *
+ * If NULL is passed, this is a no-op.
+ *
+ * RETURNS:
+ * 0 on success, or error code on failure.
+ */
+void drm_file_free(struct drm_file *file)
+{
+ struct drm_device *dev;
+
+ if (!file)
+ return;
+
+ dev = file->minor->dev;
+
+ DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
+ task_pid_nr(current),
+ (long)old_en
Re: [Intel-gfx] [RFC v2 1/8] drm: provide management functions for drm_file
On Wed, Jan 03, 2018 at 11:21:03PM +0100, Noralf Trønnes wrote:
> From: David Herrmann
>
> Rather than doing drm_file allocation/destruction right in the fops, lets
> provide separate helpers. This decouples drm_file management from the
> still-mandatory drm-fops. It prepares for use of drm_file without the
> fops, both by possible separate fops implementations and APIs (not that I
> am aware of any such plans), and more importantly from in-kernel use where
> no real file is available.
>
> Signed-off-by: David Herrmann
> [rebased]
> Signed-off-by: Noralf Trønnes
> ---
> drivers/gpu/drm/drm_file.c | 309
> +++--
> drivers/gpu/drm/drm_internal.h | 2 +
> 2 files changed, 179 insertions(+), 132 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
> index b3c6e997ccdb..d208faade27e 100644
> --- a/drivers/gpu/drm/drm_file.c
> +++ b/drivers/gpu/drm/drm_file.c
> @@ -101,6 +101,179 @@ DEFINE_MUTEX(drm_global_mutex);
>
> static int drm_open_helper(struct file *filp, struct drm_minor *minor);
>
> +/**
> + * drm_file_alloc - allocate file context
> + * @minor: minor to allocate on
> + *
> + * This allocates a new DRM file context. It is not linked into any context
> and
> + * can be used by the caller freely. Note that the context keeps a pointer to
> + * @minor, so it must be freed before @minor is.
> + *
> + * The legacy paths might require the drm_global_mutex to be held.
I'd remove this line, since it's only relevant to close the driver load
vs. file open race for drivers still using the deprecated ->load callback.
This only confuses and doesn't help anyone writing a new/modern driver.
> + *
> + * RETURNS:
> + * Pointer to newly allocated context, ERR_PTR on failure.
> + */
> +struct drm_file *drm_file_alloc(struct drm_minor *minor)
> +{
> + struct drm_device *dev = minor->dev;
> + struct drm_file *file;
> + int ret;
> +
> + file = kzalloc(sizeof(*file), GFP_KERNEL);
> + if (!file)
> + return ERR_PTR(-ENOMEM);
> +
> + file->pid = get_pid(task_pid(current));
> + file->minor = minor;
> +
> + /* for compatibility root is always authenticated */
> + file->authenticated = capable(CAP_SYS_ADMIN);
> + file->lock_count = 0;
> +
> + INIT_LIST_HEAD(&file->lhead);
> + INIT_LIST_HEAD(&file->fbs);
> + mutex_init(&file->fbs_lock);
> + INIT_LIST_HEAD(&file->blobs);
> + INIT_LIST_HEAD(&file->pending_event_list);
> + INIT_LIST_HEAD(&file->event_list);
> + init_waitqueue_head(&file->event_wait);
> + file->event_space = 4096; /* set aside 4k for event buffer */
> +
> + mutex_init(&file->event_read_lock);
> +
> + if (drm_core_check_feature(dev, DRIVER_GEM))
> + drm_gem_open(dev, file);
> +
> + if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
> + drm_syncobj_open(file);
> +
> + if (drm_core_check_feature(dev, DRIVER_PRIME))
> + drm_prime_init_file_private(&file->prime);
> +
> + if (dev->driver->open) {
> + ret = dev->driver->open(dev, file);
> + if (ret < 0)
> + goto out_prime_destroy;
> + }
> +
> + if (drm_is_primary_client(file)) {
> + ret = drm_master_open(file);
> + if (ret)
> + goto out_close;
> + }
> +
> + return file;
> +
> +out_close:
> + if (dev->driver->postclose)
> + dev->driver->postclose(dev, file);
> +out_prime_destroy:
> + if (drm_core_check_feature(dev, DRIVER_PRIME))
> + drm_prime_destroy_file_private(&file->prime);
> + if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
> + drm_syncobj_release(file);
> + if (drm_core_check_feature(dev, DRIVER_GEM))
> + drm_gem_release(dev, file);
> + put_pid(file->pid);
> + kfree(file);
> +
> + return ERR_PTR(ret);
> +}
> +
> +static void drm_events_release(struct drm_file *file_priv)
> +{
> + struct drm_device *dev = file_priv->minor->dev;
> + struct drm_pending_event *e, *et;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&dev->event_lock, flags);
> +
> + /* Unlink pending events */
> + list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
> + pending_link) {
> + list_del(&e->pending_link);
> + e->file_priv = NULL;
> + }
> +
> + /* Remove unconsumed events */
> + list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
> + list_del(&e->link);
> + kfree(e);
> + }
> +
> + spin_unlock_irqrestore(&dev->event_lock, flags);
> +}
> +
> +/**
> + * drm_file_free - free file context
> + * @file: context to free, or NULL
> + *
> + * This destroys and deallocates a DRM file context previously allocated via
> + * drm_file_alloc(). The caller must make sure to unlink it from any contexts
> + * before calling this.
> + *
> + * The legacy paths might requir
Re: [Intel-gfx] [RFC v2 1/8] drm: provide management functions for drm_file
Hi On Tue, Jan 9, 2018 at 11:20 AM, Daniel Vetter wrote: > On Wed, Jan 03, 2018 at 11:21:03PM +0100, Noralf Trønnes wrote: >> From: David Herrmann >> >> Rather than doing drm_file allocation/destruction right in the fops, lets >> provide separate helpers. This decouples drm_file management from the >> still-mandatory drm-fops. It prepares for use of drm_file without the >> fops, both by possible separate fops implementations and APIs (not that I >> am aware of any such plans), and more importantly from in-kernel use where >> no real file is available. >> >> Signed-off-by: David Herrmann >> [rebased] >> Signed-off-by: Noralf Trønnes >> --- For completeness: Still fine with me! Thanks for picking it up. Thanks David ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
