[PATCH 23/23] drm: Cleanup VBLANK callbacks in struct drm_driver
Daniel Vetter
daniel at ffwll.ch
Sun Jan 12 22:53:12 UTC 2020
On Fri, Jan 10, 2020 at 10:21:27AM +0100, Thomas Zimmermann wrote:
> All non-legacy users of VBLANK functions in struct drm_driver have been
> converted to use the respective interfaces in struct drm_crtc_funcs. The
> remaining users of VBLANK callbacks in struct drm_driver are legacy drivers
> with userspace modesetting.
>
> There are no users left of get_vblank_timestamp(), so the callback is
> being removed. The other VBLANK callbacks are being moved to the legacy
> section at the end of struct drm_driver.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
I think sprinkling some WARN_ON (in drm_dev_register or wherever) if new
drivers try to use the legacy hooks would be really nice. Experience says
someone is going to copypaste this stuff around forever otherwise.
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/drm_vblank.c | 39 +++++---------
> include/drm/drm_drv.h | 101 ++---------------------------------
> 2 files changed, 17 insertions(+), 123 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 7cf436a4b908..ceff68474d4d 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -138,10 +138,9 @@ static u32 __get_vblank_counter(struct drm_device *dev, unsigned int pipe)
>
> if (crtc->funcs->get_vblank_counter)
> return crtc->funcs->get_vblank_counter(crtc);
> - }
> -
> - if (dev->driver->get_vblank_counter)
> + } else if (dev->driver->get_vblank_counter) {
> return dev->driver->get_vblank_counter(dev, pipe);
> + }
>
> return drm_vblank_no_hw_counter(dev, pipe);
> }
> @@ -334,8 +333,7 @@ u64 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc)
> unsigned long flags;
>
> WARN_ONCE(drm_debug_enabled(DRM_UT_VBL) &&
> - !crtc->funcs->get_vblank_timestamp &&
> - !dev->driver->get_vblank_timestamp,
> + !crtc->funcs->get_vblank_timestamp,
> "This function requires support for accurate vblank timestamps.");
>
> spin_lock_irqsave(&dev->vblank_time_lock, flags);
> @@ -357,13 +355,11 @@ static void __disable_vblank(struct drm_device *dev, unsigned int pipe)
> if (WARN_ON(!crtc))
> return;
>
> - if (crtc->funcs->disable_vblank) {
> + if (crtc->funcs->disable_vblank)
> crtc->funcs->disable_vblank(crtc);
> - return;
> - }
> + } else {
> + dev->driver->disable_vblank(dev, pipe);
> }
> -
> - dev->driver->disable_vblank(dev, pipe);
> }
>
> /*
> @@ -791,9 +787,6 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
>
> ret = crtc->funcs->get_vblank_timestamp(crtc, &max_error,
> tvblank, in_vblank_irq);
> - } else if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
> - ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
> - tvblank, in_vblank_irq);
> }
>
> /* GPU high precision timestamp query unsupported or failed.
> @@ -1016,9 +1009,11 @@ static int __enable_vblank(struct drm_device *dev, unsigned int pipe)
>
> if (crtc->funcs->enable_vblank)
> return crtc->funcs->enable_vblank(crtc);
> + } else if (dev->driver->enable_vblank) {
> + return dev->driver->enable_vblank(dev, pipe);
> }
>
> - return dev->driver->enable_vblank(dev, pipe);
> + return -EINVAL;
> }
>
> static int drm_vblank_enable(struct drm_device *dev, unsigned int pipe)
> @@ -1109,13 +1104,10 @@ static bool __vblank_disable_immediate(struct drm_device *dev, unsigned int pipe
> return false;
>
> crtc = drm_crtc_from_index(dev, pipe);
> - if (crtc && crtc->funcs->get_vblank_timestamp)
> - return true;
> -
> - if (dev->driver->get_vblank_timestamp)
> - return true;
> + if (!crtc || !crtc->funcs->get_vblank_timestamp)
> + return false;
>
> - return false;
> + return true;
> }
>
> static void drm_vblank_put(struct drm_device *dev, unsigned int pipe)
> @@ -1798,7 +1790,6 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
> struct drm_pending_vblank_event *e, *t;
> ktime_t now;
> u64 seq;
> - bool high_prec;
>
> assert_spin_locked(&dev->event_lock);
>
> @@ -1818,10 +1809,8 @@ static void drm_handle_vblank_events(struct drm_device *dev, unsigned int pipe)
> send_vblank_event(dev, e, seq, now);
> }
>
> - high_prec = crtc->funcs->get_vblank_timestamp ||
> - dev->driver->get_vblank_timestamp;
> -
> - trace_drm_vblank_event(pipe, seq, now, high_prec);
> + trace_drm_vblank_event(pipe, seq, now,
> + crtc->funcs->get_vblank_timestamp != NULL);
> }
>
> /**
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index b704e252f3b2..e290b3aca6eb 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -268,104 +268,6 @@ struct drm_driver {
> */
> void (*release) (struct drm_device *);
>
> - /**
> - * @get_vblank_counter:
> - *
> - * Driver callback for fetching a raw hardware vblank counter for the
> - * CRTC specified with the pipe argument. If a device doesn't have a
> - * hardware counter, the driver can simply leave the hook as NULL.
> - * The DRM core will account for missed vblank events while interrupts
> - * where disabled based on system timestamps.
> - *
> - * Wraparound handling and loss of events due to modesetting is dealt
> - * with in the DRM core code, as long as drivers call
> - * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
> - * enabling a CRTC.
> - *
> - * This is deprecated and should not be used by new drivers.
> - * Use &drm_crtc_funcs.get_vblank_counter instead.
> - *
> - * Returns:
> - *
> - * Raw vblank counter value.
> - */
> - u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
> -
> - /**
> - * @enable_vblank:
> - *
> - * Enable vblank interrupts for the CRTC specified with the pipe
> - * argument.
> - *
> - * This is deprecated and should not be used by new drivers.
> - * Use &drm_crtc_funcs.enable_vblank instead.
> - *
> - * Returns:
> - *
> - * Zero on success, appropriate errno if the given @crtc's vblank
> - * interrupt cannot be enabled.
> - */
> - int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
> -
> - /**
> - * @disable_vblank:
> - *
> - * Disable vblank interrupts for the CRTC specified with the pipe
> - * argument.
> - *
> - * This is deprecated and should not be used by new drivers.
> - * Use &drm_crtc_funcs.disable_vblank instead.
> - */
> - void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
> -
> - /**
> - * @get_vblank_timestamp:
> - *
> - * Called by drm_get_last_vbltimestamp(). Should return a precise
> - * timestamp when the most recent VBLANK interval ended or will end.
> - *
> - * Specifically, the timestamp in @vblank_time should correspond as
> - * closely as possible to the time when the first video scanline of
> - * the video frame after the end of VBLANK will start scanning out,
> - * the time immediately after end of the VBLANK interval. If the
> - * @crtc is currently inside VBLANK, this will be a time in the future.
> - * If the @crtc is currently scanning out a frame, this will be the
> - * past start time of the current scanout. This is meant to adhere
> - * to the OpenML OML_sync_control extension specification.
> - *
> - * Paramters:
> - *
> - * dev:
> - * dev DRM device handle.
> - * pipe:
> - * crtc for which timestamp should be returned.
> - * max_error:
> - * Maximum allowable timestamp error in nanoseconds.
> - * Implementation should strive to provide timestamp
> - * with an error of at most max_error nanoseconds.
> - * Returns true upper bound on error for timestamp.
> - * vblank_time:
> - * Target location for returned vblank timestamp.
> - * in_vblank_irq:
> - * True when called from drm_crtc_handle_vblank(). Some drivers
> - * need to apply some workarounds for gpu-specific vblank irq quirks
> - * if flag is set.
> - *
> - * Returns:
> - *
> - * True on success, false on failure, which means the core should
> - * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
> - *
> - * FIXME:
> - *
> - * We should move this hook to &struct drm_crtc_funcs like all the other
> - * vblank hooks.
> - */
> - bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
> - int *max_error,
> - ktime_t *vblank_time,
> - bool in_vblank_irq);
> -
> /**
> * @irq_handler:
> *
> @@ -720,6 +622,9 @@ struct drm_driver {
> int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
> int (*dma_quiescent) (struct drm_device *);
> int (*context_dtor) (struct drm_device *dev, int context);
> + u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
> + int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
> + void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
> int dev_priv_size;
> };
>
> --
> 2.24.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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