From: Chris Wilson <chris@chris-wilson.co.uk> To: intel-gfx@lists.freedesktop.org Subject: [PATCH 1/4] drm: Expose a method for creating anonymous struct file around drm_minor Date: Wed, 6 Nov 2019 13:04:13 +0000 [thread overview] Message-ID: <20191106130416.23076-1-chris@chris-wilson.co.uk> (raw) Sometimes we need to create a struct file to wrap a drm_device, as it the user were to have opened /dev/dri/card0 but to do so anonymously (i.e. for internal use). Provide a utility method to create a struct file with the drm_device->driver.fops, that wrap the drm_device. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> --- drivers/gpu/drm/drm_file.c | 42 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_file.h | 3 +++ 2 files changed, 45 insertions(+) diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c index ea34bc991858..cc1267f701c5 100644 --- a/drivers/gpu/drm/drm_file.c +++ b/drivers/gpu/drm/drm_file.c @@ -31,7 +31,9 @@ * OTHER DEALINGS IN THE SOFTWARE. */ +#include <linux/anon_inodes.h> #include <linux/dma-fence.h> +#include <linux/file.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/poll.h> @@ -754,3 +756,43 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) spin_unlock_irqrestore(&dev->event_lock, irqflags); } EXPORT_SYMBOL(drm_send_event); + +/** + * anon_drm_getfile - Create a new struct file for the drm device + * @minor: drm minor to wrap (e.g. drm_device->primary) + * @flags: file creation mode (O_RDWR etc) + * + * This create a new struct file that wraps a DRM file context around a + * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without + * invoking userspace. The struct file may be operated on using its f_op + * (the drm_device.driver.fops) to mimick userspace operations, or be supplied + * to userspace facing functions as an internal/anonymous client. + * + * RETURNS: + * Pointer to newly created struct file, ERR_PTR on failure. + */ +struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags) +{ + struct drm_device *dev = minor->dev; + struct drm_file *priv; + struct file *file; + + priv = drm_file_alloc(minor); + if (IS_ERR(priv)) + return ERR_CAST(priv); + + file = anon_inode_getfile("drm", dev->driver->fops, priv, flags); + if (IS_ERR(file)) { + drm_file_free(priv); + return file; + } + + /* Everyone shares a single global address space */ + file->f_mapping = dev->anon_inode->i_mapping; + + drm_dev_get(dev); + priv->filp = file; + + return file; +} +EXPORT_SYMBOL(anon_drm_getfile); diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h index 67af60bb527a..b963535964f7 100644 --- a/include/drm/drm_file.h +++ b/include/drm/drm_file.h @@ -42,6 +42,7 @@ struct dma_fence; struct drm_file; struct drm_device; struct device; +struct file; /* * FIXME: Not sure we want to have drm_minor here in the end, but to avoid @@ -387,4 +388,6 @@ void drm_event_cancel_free(struct drm_device *dev, void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e); void drm_send_event(struct drm_device *dev, struct drm_pending_event *e); +struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags); + #endif /* _DRM_FILE_H_ */ -- 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 Subject: [Intel-gfx] [PATCH 1/4] drm: Expose a method for creating anonymous struct file around drm_minor Date: Wed, 6 Nov 2019 13:04:13 +0000 [thread overview] Message-ID: <20191106130416.23076-1-chris@chris-wilson.co.uk> (raw) Message-ID: <20191106130413.F0bnRIKf7EErQ8h5MDwvUsHK4bdw6rz3_AgR2tIPR3I@z> (raw) Sometimes we need to create a struct file to wrap a drm_device, as it the user were to have opened /dev/dri/card0 but to do so anonymously (i.e. for internal use). Provide a utility method to create a struct file with the drm_device->driver.fops, that wrap the drm_device. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> --- drivers/gpu/drm/drm_file.c | 42 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_file.h | 3 +++ 2 files changed, 45 insertions(+) diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c index ea34bc991858..cc1267f701c5 100644 --- a/drivers/gpu/drm/drm_file.c +++ b/drivers/gpu/drm/drm_file.c @@ -31,7 +31,9 @@ * OTHER DEALINGS IN THE SOFTWARE. */ +#include <linux/anon_inodes.h> #include <linux/dma-fence.h> +#include <linux/file.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/poll.h> @@ -754,3 +756,43 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) spin_unlock_irqrestore(&dev->event_lock, irqflags); } EXPORT_SYMBOL(drm_send_event); + +/** + * anon_drm_getfile - Create a new struct file for the drm device + * @minor: drm minor to wrap (e.g. drm_device->primary) + * @flags: file creation mode (O_RDWR etc) + * + * This create a new struct file that wraps a DRM file context around a + * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without + * invoking userspace. The struct file may be operated on using its f_op + * (the drm_device.driver.fops) to mimick userspace operations, or be supplied + * to userspace facing functions as an internal/anonymous client. + * + * RETURNS: + * Pointer to newly created struct file, ERR_PTR on failure. + */ +struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags) +{ + struct drm_device *dev = minor->dev; + struct drm_file *priv; + struct file *file; + + priv = drm_file_alloc(minor); + if (IS_ERR(priv)) + return ERR_CAST(priv); + + file = anon_inode_getfile("drm", dev->driver->fops, priv, flags); + if (IS_ERR(file)) { + drm_file_free(priv); + return file; + } + + /* Everyone shares a single global address space */ + file->f_mapping = dev->anon_inode->i_mapping; + + drm_dev_get(dev); + priv->filp = file; + + return file; +} +EXPORT_SYMBOL(anon_drm_getfile); diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h index 67af60bb527a..b963535964f7 100644 --- a/include/drm/drm_file.h +++ b/include/drm/drm_file.h @@ -42,6 +42,7 @@ struct dma_fence; struct drm_file; struct drm_device; struct device; +struct file; /* * FIXME: Not sure we want to have drm_minor here in the end, but to avoid @@ -387,4 +388,6 @@ void drm_event_cancel_free(struct drm_device *dev, void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e); void drm_send_event(struct drm_device *dev, struct drm_pending_event *e); +struct file *anon_drm_getfile(struct drm_minor *minor, unsigned int flags); + #endif /* _DRM_FILE_H_ */ -- 2.24.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next reply other threads:[~2019-11-06 13:04 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-06 13:04 Chris Wilson [this message] 2019-11-06 13:04 ` [Intel-gfx] [PATCH 1/4] drm: Expose a method for creating anonymous struct file around drm_minor Chris Wilson 2019-11-06 13:04 ` [PATCH 2/4] drm/i915/selftests: Replace mock_file hackery with drm's true fake Chris Wilson 2019-11-06 13:04 ` [Intel-gfx] " Chris Wilson 2019-11-06 13:04 ` [PATCH 3/4] drm/i915/selftests: Wrap vm_mmap() around GEM objects Chris Wilson 2019-11-06 13:04 ` [Intel-gfx] " Chris Wilson 2019-11-06 13:04 ` [PATCH 4/4] drm/i915/selftests: Verify mmap_gtt revocation on unbinding Chris Wilson 2019-11-06 13:04 ` [Intel-gfx] " Chris Wilson 2019-11-06 15:39 ` ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/4] drm: Expose a method for creating anonymous struct file around drm_minor Patchwork 2019-11-06 15:39 ` [Intel-gfx] " Patchwork 2019-11-06 16:07 ` ✗ Fi.CI.BAT: failure " Patchwork 2019-11-06 16:07 ` [Intel-gfx] " Patchwork
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