[PATCH 23/23] drm: Cleanup VBLANK callbacks in struct drm_driver
Thomas Zimmermann
tzimmermann at suse.de
Tue Jan 14 13:48:13 UTC 2020
Hi
Am 12.01.20 um 23:53 schrieb Daniel Vetter:
> 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.
I've been thinking about moving these fields to separate structures, say
struct drm_legacy_device and struct drm_legacy_driver. Those would be
allocated for legacy drivers and KMS drivers would never see them
(except for their forward declaration).
Best regards
Thomas
>
> 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
>>
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
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