From: Michel Dänzer michel.daenzer@amd.com
Now we can program a flip during a vertical blank period, if it's the one targeted by the flip (or a later one). This allows simplifying amdgpu_flip_work_func considerably.
Signed-off-by: Michel Dänzer michel.daenzer@amd.com --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 3 +- drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 98 +++++++++-------------------- drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h | 8 +-- drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 2 +- drivers/gpu/drm/amd/amdgpu/dce_v11_0.c | 2 +- drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 2 +- 6 files changed, 39 insertions(+), 76 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index eb09037..71f4a4c 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -718,10 +718,11 @@ void amdgpu_doorbell_get_kfd_info(struct amdgpu_device *adev, */
struct amdgpu_flip_work { - struct work_struct flip_work; + struct delayed_work flip_work; struct work_struct unpin_work; struct amdgpu_device *adev; int crtc_id; + u32 target_vblank; uint64_t base; struct drm_pending_vblank_event *event; struct amdgpu_bo *old_rbo; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c index 7dbe8d0..ce1f2bf 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c @@ -41,7 +41,7 @@ static void amdgpu_flip_callback(struct fence *f, struct fence_cb *cb) container_of(cb, struct amdgpu_flip_work, cb);
fence_put(f); - schedule_work(&work->flip_work); + schedule_work(&work->flip_work.work); }
static bool amdgpu_flip_handle_fence(struct amdgpu_flip_work *work, @@ -63,16 +63,17 @@ static bool amdgpu_flip_handle_fence(struct amdgpu_flip_work *work,
static void amdgpu_flip_work_func(struct work_struct *__work) { + struct delayed_work *delayed_work = + container_of(__work, struct delayed_work, work); struct amdgpu_flip_work *work = - container_of(__work, struct amdgpu_flip_work, flip_work); + container_of(delayed_work, struct amdgpu_flip_work, flip_work); struct amdgpu_device *adev = work->adev; struct amdgpu_crtc *amdgpuCrtc = adev->mode_info.crtcs[work->crtc_id];
struct drm_crtc *crtc = &amdgpuCrtc->base; unsigned long flags; - unsigned i, repcnt = 4; - int vpos, hpos, stat, min_udelay = 0; - struct drm_vblank_crtc *vblank = &crtc->dev->vblank[work->crtc_id]; + unsigned i; + int vpos, hpos;
if (amdgpu_flip_handle_fence(work, &work->excl)) return; @@ -81,55 +82,23 @@ static void amdgpu_flip_work_func(struct work_struct *__work) if (amdgpu_flip_handle_fence(work, &work->shared[i])) return;
- /* We borrow the event spin lock for protecting flip_status */ - spin_lock_irqsave(&crtc->dev->event_lock, flags); - - /* If this happens to execute within the "virtually extended" vblank - * interval before the start of the real vblank interval then it needs - * to delay programming the mmio flip until the real vblank is entered. - * This prevents completing a flip too early due to the way we fudge - * our vblank counter and vblank timestamps in order to work around the - * problem that the hw fires vblank interrupts before actual start of - * vblank (when line buffer refilling is done for a frame). It - * complements the fudging logic in amdgpu_get_crtc_scanoutpos() for - * timestamping and amdgpu_get_vblank_counter_kms() for vblank counts. - * - * In practice this won't execute very often unless on very fast - * machines because the time window for this to happen is very small. + /* Wait until we're out of the vertical blank period before the one + * targeted by the flip */ - while (amdgpuCrtc->enabled && --repcnt) { - /* GET_DISTANCE_TO_VBLANKSTART returns distance to real vblank - * start in hpos, and to the "fudged earlier" vblank start in - * vpos. - */ - stat = amdgpu_get_crtc_scanoutpos(adev->ddev, work->crtc_id, - GET_DISTANCE_TO_VBLANKSTART, - &vpos, &hpos, NULL, NULL, - &crtc->hwmode); - - if ((stat & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE)) != - (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE) || - !(vpos >= 0 && hpos <= 0)) - break; - - /* Sleep at least until estimated real start of hw vblank */ - min_udelay = (-hpos + 1) * max(vblank->linedur_ns / 1000, 5); - if (min_udelay > vblank->framedur_ns / 2000) { - /* Don't wait ridiculously long - something is wrong */ - repcnt = 0; - break; - } - spin_unlock_irqrestore(&crtc->dev->event_lock, flags); - usleep_range(min_udelay, 2 * min_udelay); - spin_lock_irqsave(&crtc->dev->event_lock, flags); - }; + if (amdgpuCrtc->enabled && + (amdgpu_get_crtc_scanoutpos(adev->ddev, work->crtc_id, 0, + &vpos, &hpos, NULL, NULL, + &crtc->hwmode) + & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK)) == + (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK) && + (int)(work->target_vblank - + amdgpu_get_vblank_counter_kms(adev->ddev, amdgpuCrtc->crtc_id)) > 0) { + schedule_delayed_work(&work->flip_work, usecs_to_jiffies(1000)); + return; + }
- if (!repcnt) - DRM_DEBUG_DRIVER("Delay problem on crtc %d: min_udelay %d, " - "framedur %d, linedur %d, stat %d, vpos %d, " - "hpos %d\n", work->crtc_id, min_udelay, - vblank->framedur_ns / 1000, - vblank->linedur_ns / 1000, stat, vpos, hpos); + /* We borrow the event spin lock for protecting flip_status */ + spin_lock_irqsave(&crtc->dev->event_lock, flags);
/* Do the flip (mmio) */ adev->mode_info.funcs->page_flip(adev, work->crtc_id, work->base, work->async); @@ -169,10 +138,10 @@ static void amdgpu_unpin_work_func(struct work_struct *__work) kfree(work); }
-int amdgpu_crtc_page_flip(struct drm_crtc *crtc, - struct drm_framebuffer *fb, - struct drm_pending_vblank_event *event, - uint32_t page_flip_flags) +int amdgpu_crtc_page_flip_target(struct drm_crtc *crtc, + struct drm_framebuffer *fb, + struct drm_pending_vblank_event *event, + uint32_t page_flip_flags, uint32_t target) { struct drm_device *dev = crtc->dev; struct amdgpu_device *adev = dev->dev_private; @@ -191,7 +160,7 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, if (work == NULL) return -ENOMEM;
- INIT_WORK(&work->flip_work, amdgpu_flip_work_func); + INIT_DELAYED_WORK(&work->flip_work, amdgpu_flip_work_func); INIT_WORK(&work->unpin_work, amdgpu_unpin_work_func);
work->event = event; @@ -237,12 +206,8 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, amdgpu_bo_unreserve(new_rbo);
work->base = base; - - r = drm_crtc_vblank_get(crtc); - if (r) { - DRM_ERROR("failed to get vblank before flip\n"); - goto pflip_cleanup; - } + work->target_vblank = target - drm_crtc_vblank_count(crtc) + + amdgpu_get_vblank_counter_kms(dev, work->crtc_id);
/* we borrow the event spin lock for protecting flip_wrok */ spin_lock_irqsave(&crtc->dev->event_lock, flags); @@ -250,7 +215,7 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, DRM_DEBUG_DRIVER("flip queue: crtc already busy\n"); spin_unlock_irqrestore(&crtc->dev->event_lock, flags); r = -EBUSY; - goto vblank_cleanup; + goto pflip_cleanup; }
amdgpu_crtc->pflip_status = AMDGPU_FLIP_PENDING; @@ -262,12 +227,9 @@ int amdgpu_crtc_page_flip(struct drm_crtc *crtc, /* update crtc fb */ crtc->primary->fb = fb; spin_unlock_irqrestore(&crtc->dev->event_lock, flags); - amdgpu_flip_work_func(&work->flip_work); + amdgpu_flip_work_func(&work->flip_work.work); return 0;
-vblank_cleanup: - drm_crtc_vblank_put(crtc); - pflip_cleanup: if (unlikely(amdgpu_bo_reserve(new_rbo, false) != 0)) { DRM_ERROR("failed to reserve new rbo in error path\n"); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h index 6b1d7d3..4552d80 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h @@ -587,10 +587,10 @@ int amdgpu_align_pitch(struct amdgpu_device *adev, int width, int bpp, bool tile void amdgpu_print_display_setup(struct drm_device *dev); int amdgpu_modeset_create_props(struct amdgpu_device *adev); int amdgpu_crtc_set_config(struct drm_mode_set *set); -int amdgpu_crtc_page_flip(struct drm_crtc *crtc, - struct drm_framebuffer *fb, - struct drm_pending_vblank_event *event, - uint32_t page_flip_flags); +int amdgpu_crtc_page_flip_target(struct drm_crtc *crtc, + struct drm_framebuffer *fb, + struct drm_pending_vblank_event *event, + uint32_t page_flip_flags, uint32_t target); extern const struct drm_mode_config_funcs amdgpu_mode_funcs;
#endif diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c index c1b04e9..a158942 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c @@ -2698,7 +2698,7 @@ static const struct drm_crtc_funcs dce_v10_0_crtc_funcs = { .gamma_set = dce_v10_0_crtc_gamma_set, .set_config = amdgpu_crtc_set_config, .destroy = dce_v10_0_crtc_destroy, - .page_flip = amdgpu_crtc_page_flip, + .page_flip_target = amdgpu_crtc_page_flip_target, };
static void dce_v10_0_crtc_dpms(struct drm_crtc *crtc, int mode) diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c index d4bf133..4455d63 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v11_0.c @@ -2708,7 +2708,7 @@ static const struct drm_crtc_funcs dce_v11_0_crtc_funcs = { .gamma_set = dce_v11_0_crtc_gamma_set, .set_config = amdgpu_crtc_set_config, .destroy = dce_v11_0_crtc_destroy, - .page_flip = amdgpu_crtc_page_flip, + .page_flip_target = amdgpu_crtc_page_flip_target, };
static void dce_v11_0_crtc_dpms(struct drm_crtc *crtc, int mode) diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c index 4fdfab1..ad4884a 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c @@ -2552,7 +2552,7 @@ static const struct drm_crtc_funcs dce_v8_0_crtc_funcs = { .gamma_set = dce_v8_0_crtc_gamma_set, .set_config = amdgpu_crtc_set_config, .destroy = dce_v8_0_crtc_destroy, - .page_flip = amdgpu_crtc_page_flip, + .page_flip_target = amdgpu_crtc_page_flip_target, };
static void dce_v8_0_crtc_dpms(struct drm_crtc *crtc, int mode)