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alistair23-linux/drivers/gpu/drm/drm_internal.h
Lyude Paul 5e6c2b4f91 drm/vblank: Add vblank works 
Add some kind of vblank workers. The interface is similar to regular
delayed works, and is mostly based off kthread_work. It allows for
scheduling delayed works that execute once a particular vblank sequence
has passed. It also allows for accurate flushing of scheduled vblank
works - in that flushing waits for both the vblank sequence and job
execution to complete, or for the work to get cancelled - whichever
comes first.

Whatever hardware programming we do in the work must be fast (must at
least complete during the vblank or scanout period, sometimes during the
first few scanlines of the vblank). As such we use a high-priority
per-CRTC thread to accomplish this.

Changes since v7:
* Stuff drm_vblank_internal.h and drm_vblank_work_internal.h contents
  into drm_internal.h
* Get rid of unnecessary spinlock in drm_crtc_vblank_on()
* Remove !vblank->worker check
* Grab vbl_lock in drm_vblank_work_schedule()
* Mention self-rearming work items in drm_vblank_work_schedule() kdocs
* Return 1 from drm_vblank_work_schedule() if the work was scheduled
  successfully, 0 or error code otherwise
* Use drm_dbg_core() instead of DRM_DEV_ERROR() in
  drm_vblank_work_schedule()
* Remove vblank->worker checks in drm_vblank_destroy_worker() and
  drm_vblank_flush_worker()
Changes since v6:
* Get rid of ->pending and seqcounts, and implement flushing through
  simpler means - danvet
* Get rid of work_lock, just use drm_device->event_lock
* Move drm_vblank_work item cleanup into drm_crtc_vblank_off() so that
  we ensure that all vblank work has finished before disabling vblanks
* Add checks into drm_crtc_vblank_reset() so we yell if it gets called
  while there's vblank workers active
* Grab event_lock in both drm_crtc_vblank_on()/drm_crtc_vblank_off(),
  the main reason for this is so that other threads calling
  drm_vblank_work_schedule() are blocked from attempting to schedule
  while we're in the middle of enabling/disabling vblanks.
* Move drm_handle_vblank_works() call below drm_handle_vblank_events()
* Simplify drm_vblank_work_cancel_sync()
* Fix drm_vblank_work_cancel_sync() documentation
* Move wake_up_all() calls out of spinlock where we can. The only one I
  left was the call to wake_up_all() in drm_vblank_handle_works() as
  this seemed like it made more sense just living in that function
  (which is all technically under lock)
* Move drm_vblank_work related functions into their own source files
* Add drm_vblank_internal.h so we can export some functions we don't
  want drivers using, but that we do need to use in drm_vblank_work.c
* Add a bunch of documentation
Changes since v4:
* Get rid of kthread interfaces we tried adding and move all of the
  locking into drm_vblank.c. For implementing drm_vblank_work_flush(),
  we now use a wait_queue and sequence counters in order to
  differentiate between multiple work item executions.
* Get rid of drm_vblank_work_cancel() - this would have been pretty
  difficult to actually reimplement and it occurred to me that neither
  nouveau or i915 are even planning to use this function. Since there's
  also no async cancel function for most of the work interfaces in the
  kernel, it seems a bit unnecessary anyway.
* Get rid of to_drm_vblank_work() since we now are also able to just
  pass the struct drm_vblank_work to work item callbacks anyway
Changes since v3:
* Use our own spinlocks, don't integrate so tightly with kthread_works
Changes since v2:
* Use kthread_workers instead of reinventing the wheel.

Cc: Tejun Heo <tj@kernel.org>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Co-developed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200627194657.156514-4-lyude@redhat.com
2020-07-16 18:16:31 -04:00

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/*
* Copyright © 2014 Intel Corporation
* Daniel Vetter <daniel.vetter@ffwll.ch>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/kthread.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_vblank.h>
#define DRM_IF_MAJOR 1
#define DRM_IF_MINOR 4
#define DRM_IF_VERSION(maj, min) (maj << 16 | min)
struct dentry;
struct dma_buf;
struct drm_connector;
struct drm_crtc;
struct drm_framebuffer;
struct drm_gem_object;
struct drm_master;
struct drm_minor;
struct drm_prime_file_private;
struct drm_printer;
struct drm_vblank_crtc;
/* drm_file.c */
extern struct mutex drm_global_mutex;
bool drm_dev_needs_global_mutex(struct drm_device *dev);
struct drm_file *drm_file_alloc(struct drm_minor *minor);
void drm_file_free(struct drm_file *file);
void drm_lastclose(struct drm_device *dev);
#ifdef CONFIG_PCI
/* drm_pci.c */
int drm_irq_by_busid(struct drm_device *dev, void *data,
struct drm_file *file_priv);
void drm_pci_agp_destroy(struct drm_device *dev);
int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master);
#else
static inline int drm_irq_by_busid(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
return -EINVAL;
}
static inline void drm_pci_agp_destroy(struct drm_device *dev)
{
}
static inline int drm_pci_set_busid(struct drm_device *dev,
struct drm_master *master)
{
return -EINVAL;
}
#endif
/* drm_prime.c */
int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv);
void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv);
void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv,
struct dma_buf *dma_buf);
/* drm_drv.c */
struct drm_minor *drm_minor_acquire(unsigned int minor_id);
void drm_minor_release(struct drm_minor *minor);
/* drm_managed.c */
void drm_managed_release(struct drm_device *dev);
/* drm_vblank.c */
static inline bool drm_vblank_passed(u64 seq, u64 ref)
{
return (seq - ref) <= (1 << 23);
}
void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe);
int drm_vblank_get(struct drm_device *dev, unsigned int pipe);
void drm_vblank_put(struct drm_device *dev, unsigned int pipe);
u64 drm_vblank_count(struct drm_device *dev, unsigned int pipe);
/* drm_vblank_work.c */
static inline void drm_vblank_flush_worker(struct drm_vblank_crtc *vblank)
{
kthread_flush_worker(vblank->worker);
}
static inline void drm_vblank_destroy_worker(struct drm_vblank_crtc *vblank)
{
kthread_destroy_worker(vblank->worker);
}
int drm_vblank_worker_init(struct drm_vblank_crtc *vblank);
void drm_vblank_cancel_pending_works(struct drm_vblank_crtc *vblank);
void drm_handle_vblank_works(struct drm_vblank_crtc *vblank);
/* IOCTLS */
int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp);
int drm_legacy_modeset_ctl_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
/* drm_irq.c */
/* IOCTLS */
#if IS_ENABLED(CONFIG_DRM_LEGACY)
int drm_legacy_irq_control(struct drm_device *dev, void *data,
struct drm_file *file_priv);
#endif
int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp);
int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp);
/* drm_auth.c */
int drm_getmagic(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_authmagic(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_setmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_master_open(struct drm_file *file_priv);
void drm_master_release(struct drm_file *file_priv);
bool drm_master_internal_acquire(struct drm_device *dev);
void drm_master_internal_release(struct drm_device *dev);
/* drm_sysfs.c */
extern struct class *drm_class;
int drm_sysfs_init(void);
void drm_sysfs_destroy(void);
struct device *drm_sysfs_minor_alloc(struct drm_minor *minor);
int drm_sysfs_connector_add(struct drm_connector *connector);
void drm_sysfs_connector_remove(struct drm_connector *connector);
void drm_sysfs_lease_event(struct drm_device *dev);
/* drm_gem.c */
struct drm_gem_object;
int drm_gem_init(struct drm_device *dev);
int drm_gem_handle_create_tail(struct drm_file *file_priv,
struct drm_gem_object *obj,
u32 *handlep);
int drm_gem_close_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_gem_flink_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_gem_open_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
void drm_gem_open(struct drm_device *dev, struct drm_file *file_private);
void drm_gem_release(struct drm_device *dev, struct drm_file *file_private);
void drm_gem_print_info(struct drm_printer *p, unsigned int indent,
const struct drm_gem_object *obj);
int drm_gem_pin(struct drm_gem_object *obj);
void drm_gem_unpin(struct drm_gem_object *obj);
void *drm_gem_vmap(struct drm_gem_object *obj);
void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr);
/* drm_debugfs.c drm_debugfs_crc.c */
#if defined(CONFIG_DEBUG_FS)
int drm_debugfs_init(struct drm_minor *minor, int minor_id,
struct dentry *root);
void drm_debugfs_cleanup(struct drm_minor *minor);
void drm_debugfs_connector_add(struct drm_connector *connector);
void drm_debugfs_connector_remove(struct drm_connector *connector);
void drm_debugfs_crtc_add(struct drm_crtc *crtc);
void drm_debugfs_crtc_remove(struct drm_crtc *crtc);
void drm_debugfs_crtc_crc_add(struct drm_crtc *crtc);
#else
static inline int drm_debugfs_init(struct drm_minor *minor, int minor_id,
struct dentry *root)
{
return 0;
}
static inline void drm_debugfs_cleanup(struct drm_minor *minor)
{
}
static inline void drm_debugfs_connector_add(struct drm_connector *connector)
{
}
static inline void drm_debugfs_connector_remove(struct drm_connector *connector)
{
}
static inline void drm_debugfs_crtc_add(struct drm_crtc *crtc)
{
}
static inline void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
{
}
static inline void drm_debugfs_crtc_crc_add(struct drm_crtc *crtc)
{
}
#endif
drm_ioctl_t drm_version;
drm_ioctl_t drm_getunique;
drm_ioctl_t drm_getclient;
/* drm_syncobj.c */
void drm_syncobj_open(struct drm_file *file_private);
void drm_syncobj_release(struct drm_file *file_private);
int drm_syncobj_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_destroy_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_handle_to_fd_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_timeline_signal_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_private);
/* drm_framebuffer.c */
void drm_framebuffer_print_info(struct drm_printer *p, unsigned int indent,
const struct drm_framebuffer *fb);
void drm_framebuffer_debugfs_init(struct drm_minor *minor);
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