[Intel-gfx] [PATCH 1/5] drm/vblank: Switch drm_driver->get_vblank_timestamp to return a bool
Daniel Vetter
daniel at ffwll.ch
Wed May 10 08:24:00 UTC 2017
On Tue, May 09, 2017 at 04:03:25PM +0200, Daniel Vetter wrote:
> There's really no reason for anything more:
> - Calling this while the crtc vblank stuff isn't set up is a driver
> bug. Those places alrready DRM_ERROR.
> - Calling this when the crtc is off is either a driver bug (calling
> drm_crtc_handle_vblank at the wrong time) or a core bug (for
> anything else). Again, we DRM_ERROR.
> - EINVAL is checked at higher levels already, and if we'd use struct
> drm_crtc * instead of (dev, pipe) it would be real obvious that
> those are again core bugs.
>
> The only valid failure mode is crap hardware that couldn't sample a
> useful timestamp, to ask the core to just grab a not-so-accurate
> timestamp. Bool is perfectly fine for that.
>
> v2: Also fix up the one caller, I lost that in the shuffling (Jani).
>
> v3: Fixup commit message (Neil).
>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Mario Kleiner <mario.kleiner at tuebingen.mpg.de>
> Cc: Eric Anholt <eric at anholt.net>
> Cc: Rob Clark <robdclark at gmail.com>
> Cc: linux-arm-msm at vger.kernel.org
> Cc: freedreno at lists.freedesktop.org
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Ben Skeggs <bskeggs at redhat.com>
> Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>
> Acked-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
intel CI is still happy, so applied the entire series. Thanks a lot for
feedback and review.
-Daniel
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 8 ++---
> drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 14 ++++-----
> drivers/gpu/drm/drm_irq.c | 49 ++++++++++++-------------------
> drivers/gpu/drm/i915/i915_irq.c | 8 ++---
> drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 12 ++++----
> drivers/gpu/drm/nouveau/nouveau_display.c | 4 +--
> drivers/gpu/drm/nouveau/nouveau_display.h | 4 +--
> drivers/gpu/drm/radeon/radeon_drv.c | 8 ++---
> drivers/gpu/drm/radeon/radeon_kms.c | 14 ++++-----
> drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
> drivers/gpu/drm/vc4/vc4_drv.h | 2 +-
> include/drm/drmP.h | 1 -
> include/drm/drm_drv.h | 7 ++---
> include/drm/drm_irq.h | 10 +++----
> 14 files changed, 64 insertions(+), 79 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 6a8129949333..7b4f808afff9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1910,10 +1910,10 @@ int amdgpu_device_resume(struct drm_device *dev, bool resume, bool fbcon);
> u32 amdgpu_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
> int amdgpu_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags);
> +bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags);
> long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd,
> unsigned long arg);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> index 832be632478f..a1b97809305e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> @@ -945,19 +945,19 @@ void amdgpu_disable_vblank_kms(struct drm_device *dev, unsigned int pipe)
> *
> * Gets the timestamp on the requested crtc based on the
> * scanout position. (all asics).
> - * Returns postive status flags on success, negative error on failure.
> + * Returns true on success, false on failure.
> */
> -int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags)
> +bool amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags)
> {
> struct drm_crtc *crtc;
> struct amdgpu_device *adev = dev->dev_private;
>
> if (pipe >= dev->num_crtcs) {
> DRM_ERROR("Invalid crtc %u\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> /* Get associated drm_crtc: */
> @@ -966,7 +966,7 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> /* This can occur on driver load if some component fails to
> * initialize completely and driver is unloaded */
> DRM_ERROR("Uninitialized crtc %d\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> /* Helper routine in DRM core does all the work: */
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 8c866cac62dd..677b37b0372b 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -724,43 +724,32 @@ EXPORT_SYMBOL(drm_calc_timestamping_constants);
> * active. Higher level code is expected to handle this.
> *
> * Returns:
> - * Negative value on error, failure or if not supported in current
> - * video mode:
> - *
> - * -EINVAL Invalid CRTC.
> - * -EAGAIN Temporary unavailable, e.g., called before initial modeset.
> - * -ENOTSUPP Function not supported in current display mode.
> - * -EIO Failed, e.g., due to failed scanout position query.
> - *
> - * Returns or'ed positive status flags on success:
> - *
> - * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
> - * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
> *
> + * Returns true on success, and false on failure, i.e. when no accurate
> + * timestamp could be acquired.
> */
> -int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> - unsigned int pipe,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags,
> - const struct drm_display_mode *mode)
> +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> + unsigned int pipe,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags,
> + const struct drm_display_mode *mode)
> {
> struct timeval tv_etime;
> ktime_t stime, etime;
> unsigned int vbl_status;
> - int ret = DRM_VBLANKTIME_SCANOUTPOS_METHOD;
> int vpos, hpos, i;
> int delta_ns, duration_ns;
>
> if (pipe >= dev->num_crtcs) {
> DRM_ERROR("Invalid crtc %u\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> /* Scanout position query not supported? Should not happen. */
> if (!dev->driver->get_scanout_position) {
> DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
> - return -EIO;
> + return false;
> }
>
> /* If mode timing undefined, just return as no-op:
> @@ -768,7 +757,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> */
> if (mode->crtc_clock == 0) {
> DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
> - return -EAGAIN;
> + return false;
> }
>
> /* Get current scanout position with system timestamp.
> @@ -792,7 +781,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
> DRM_DEBUG("crtc %u : scanoutpos query failed [0x%x].\n",
> pipe, vbl_status);
> - return -EIO;
> + return false;
> }
>
> /* Compute uncertainty in timestamp of scanout position query. */
> @@ -836,7 +825,7 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> (long)vblank_time->tv_sec, (long)vblank_time->tv_usec,
> duration_ns/1000, i);
>
> - return ret;
> + return true;
> }
> EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
>
> @@ -872,25 +861,23 @@ static bool
> drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
> struct timeval *tvblank, unsigned flags)
> {
> - int ret;
> + bool ret = false;
>
> /* Define requested maximum error on timestamps (nanoseconds). */
> int max_error = (int) drm_timestamp_precision * 1000;
>
> /* Query driver if possible and precision timestamping enabled. */
> - if (dev->driver->get_vblank_timestamp && (max_error > 0)) {
> + if (dev->driver->get_vblank_timestamp && (max_error > 0))
> ret = dev->driver->get_vblank_timestamp(dev, pipe, &max_error,
> tvblank, flags);
> - if (ret > 0)
> - return true;
> - }
>
> /* GPU high precision timestamp query unsupported or failed.
> * Return current monotonic/gettimeofday timestamp as best estimate.
> */
> - *tvblank = get_drm_timestamp();
> + if (!ret)
> + *tvblank = get_drm_timestamp();
>
> - return false;
> + return ret;
> }
>
> /**
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 7de152878d3e..34cb05a59742 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -964,7 +964,7 @@ int intel_get_crtc_scanline(struct intel_crtc *crtc)
> return position;
> }
>
> -static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> +static bool i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> int *max_error,
> struct timeval *vblank_time,
> unsigned flags)
> @@ -974,19 +974,19 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
>
> if (pipe >= INTEL_INFO(dev_priv)->num_pipes) {
> DRM_ERROR("Invalid crtc %u\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> /* Get drm_crtc to timestamp: */
> crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
> if (crtc == NULL) {
> DRM_ERROR("Invalid crtc %u\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> if (!crtc->base.hwmode.crtc_clock) {
> DRM_DEBUG_KMS("crtc %u is disabled\n", pipe);
> - return -EBUSY;
> + return false;
> }
>
> /* Helper routine in DRM core does all the work: */
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> index d3d6b4cae1e6..ffeb34bee3af 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
> @@ -592,23 +592,23 @@ static int mdp5_get_scanoutpos(struct drm_device *dev, unsigned int pipe,
> return ret;
> }
>
> -static int mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags)
> +static bool mdp5_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags)
> {
> struct msm_drm_private *priv = dev->dev_private;
> struct drm_crtc *crtc;
>
> if (pipe < 0 || pipe >= priv->num_crtcs) {
> DRM_ERROR("Invalid crtc %d\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> crtc = priv->crtcs[pipe];
> if (!crtc) {
> DRM_ERROR("Invalid crtc %d\n", pipe);
> - return -EINVAL;
> + return false;
> }
>
> return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
> index 21b10f9840c9..f1e36f70755d 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.c
> @@ -156,7 +156,7 @@ nouveau_display_scanoutpos(struct drm_device *dev, unsigned int pipe,
> return 0;
> }
>
> -int
> +bool
> nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
> int *max_error, struct timeval *time, unsigned flags)
> {
> @@ -174,7 +174,7 @@ nouveau_display_vblstamp(struct drm_device *dev, unsigned int pipe,
> }
> }
>
> - return -EINVAL;
> + return false;
> }
>
> static void
> diff --git a/drivers/gpu/drm/nouveau/nouveau_display.h b/drivers/gpu/drm/nouveau/nouveau_display.h
> index e1d772d39488..c6bfe533a641 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_display.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_display.h
> @@ -71,8 +71,8 @@ void nouveau_display_vblank_disable(struct drm_device *, unsigned int);
> int nouveau_display_scanoutpos(struct drm_device *, unsigned int,
> unsigned int, int *, int *, ktime_t *,
> ktime_t *, const struct drm_display_mode *);
> -int nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> - struct timeval *, unsigned);
> +bool nouveau_display_vblstamp(struct drm_device *, unsigned int, int *,
> + struct timeval *, unsigned);
>
> int nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
> struct drm_pending_vblank_event *event,
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index 93d45aa5c3d4..caa0b1cc4269 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -115,10 +115,10 @@ int radeon_resume_kms(struct drm_device *dev, bool resume, bool fbcon);
> u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
> int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
> -int radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags);
> +bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags);
> void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
> int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
> void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
> index e3e7cb1d10a2..535969d74f64 100644
> --- a/drivers/gpu/drm/radeon/radeon_kms.c
> +++ b/drivers/gpu/drm/radeon/radeon_kms.c
> @@ -869,25 +869,25 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
> *
> * Gets the timestamp on the requested crtc based on the
> * scanout position. (all asics).
> - * Returns postive status flags on success, negative error on failure.
> + * Returns true on success, false on failure.
> */
> -int radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
> - int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags)
> +bool radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
> + int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags)
> {
> struct drm_crtc *drmcrtc;
> struct radeon_device *rdev = dev->dev_private;
>
> if (crtc < 0 || crtc >= dev->num_crtcs) {
> DRM_ERROR("Invalid crtc %d\n", crtc);
> - return -EINVAL;
> + return false;
> }
>
> /* Get associated drm_crtc: */
> drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
> if (!drmcrtc)
> - return -EINVAL;
> + return false;
>
> /* Helper routine in DRM core does all the work: */
> return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index d86c8cce3182..f506525a1066 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -270,7 +270,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> return ret;
> }
>
> -int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> +bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> int *max_error, struct timeval *vblank_time,
> unsigned flags)
> {
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 92eb7d811bf2..d1c53a5d0923 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -493,7 +493,7 @@ int vc4_crtc_get_scanoutpos(struct drm_device *dev, unsigned int crtc_id,
> unsigned int flags, int *vpos, int *hpos,
> ktime_t *stime, ktime_t *etime,
> const struct drm_display_mode *mode);
> -int vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> +bool vc4_crtc_get_vblank_timestamp(struct drm_device *dev, unsigned int crtc_id,
> int *max_error, struct timeval *vblank_time,
> unsigned flags);
>
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index e1daa4f343cd..a1b19bf45fb3 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -322,7 +322,6 @@ struct pci_controller;
>
> /* Flags and return codes for get_vblank_timestamp() driver function. */
> #define DRM_CALLED_FROM_VBLIRQ 1
> -#define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
>
> /* get_scanout_position() return flags */
> #define DRM_SCANOUTPOS_VALID (1 << 0)
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index d0b5f363bfa1..da78e248d9d8 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -316,11 +316,10 @@ struct drm_driver {
> *
> * Returns:
> *
> - * Zero if timestamping isn't supported in current display mode or a
> - * negative number on failure. A positive status code on success,
> - * which describes how the vblank_time timestamp was computed.
> + * True on success, false on failure, which means the core should
> + * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
> */
> - int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
> + bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
> int *max_error,
> struct timeval *vblank_time,
> unsigned flags);
> diff --git a/include/drm/drm_irq.h b/include/drm/drm_irq.h
> index cf0be6594c8c..f0d5ccf9b282 100644
> --- a/include/drm/drm_irq.h
> +++ b/include/drm/drm_irq.h
> @@ -153,11 +153,11 @@ void drm_crtc_vblank_on(struct drm_crtc *crtc);
> void drm_vblank_cleanup(struct drm_device *dev);
> u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
>
> -int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> - unsigned int pipe, int *max_error,
> - struct timeval *vblank_time,
> - unsigned flags,
> - const struct drm_display_mode *mode);
> +bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
> + unsigned int pipe, int *max_error,
> + struct timeval *vblank_time,
> + unsigned flags,
> + const struct drm_display_mode *mode);
> void drm_calc_timestamping_constants(struct drm_crtc *crtc,
> const struct drm_display_mode *mode);
>
> --
> 2.11.0
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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