[Intel-gfx] [PATCH v3] drm/i915: Replaced Blitter ring based flips with MMIO flips for VLV
Gupta, Sourab
sourab.gupta at intel.com
Thu Apr 3 10:40:38 CEST 2014
On Wed, 2014-03-26 at 13:20 +0530, sourab gupta wrote:
> Hi Ville/Damien,
> Can you please review the below patch(v3) for mmio flips.
> Thanks,
> Sourab
>
> On Sun, 2014-03-23 at 09:01 +0000, Gupta, Sourab wrote:
> > From: Sourab Gupta <sourab.gupta at intel.com>
> >
> > Using MMIO based flips on VLV for Media power well residency optimization.
> > The blitter ring is currently being used just for command streamer based
> > flip calls. For pure 3D workloads, with MMIO flips, there will be no use
> > of blitter ring and this will ensure the 100% residency for Media well.
> >
> > v2: The MMIO flips now use the interrupt driven mechanism for issuing the
> > flips when target seqno is reached. (Incorporating Ville's idea)
> >
> > v3: Rebasing on latest code. Code restructuring after incorporating
> > Damien's comments
> >
> > Signed-off-by: Sourab Gupta <sourab.gupta at intel.com>
> > Signed-off-by: Akash Goel <akash.goel at intel.com>
> > ---
> > drivers/gpu/drm/i915/i915_dma.c | 1 +
> > drivers/gpu/drm/i915/i915_drv.h | 7 ++
> > drivers/gpu/drm/i915/i915_irq.c | 2 +
> > drivers/gpu/drm/i915/intel_display.c | 124 +++++++++++++++++++++++++++++++++++
> > drivers/gpu/drm/i915/intel_drv.h | 7 ++
> > 5 files changed, 141 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> > index 4e0a26a..bca3c5a 100644
> > --- a/drivers/gpu/drm/i915/i915_dma.c
> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> > @@ -1569,6 +1569,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
> > spin_lock_init(&dev_priv->backlight_lock);
> > spin_lock_init(&dev_priv->uncore.lock);
> > spin_lock_init(&dev_priv->mm.object_stat_lock);
> > + spin_lock_init(&dev_priv->mmio_flip_lock);
> > mutex_init(&dev_priv->dpio_lock);
> > mutex_init(&dev_priv->modeset_restore_lock);
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 3f62be0..678d31d 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -1621,6 +1621,10 @@ typedef struct drm_i915_private {
> > struct i915_dri1_state dri1;
> > /* Old ums support infrastructure, same warning applies. */
> > struct i915_ums_state ums;
> > +
> > + /* protects the mmio flip data */
> > + spinlock_t mmio_flip_lock;
> > +
> > } drm_i915_private_t;
> >
> > static inline struct drm_i915_private *to_i915(const struct drm_device *dev)
> > @@ -2657,6 +2661,9 @@ int i915_reg_read_ioctl(struct drm_device *dev, void *data,
> > int i915_get_reset_stats_ioctl(struct drm_device *dev, void *data,
> > struct drm_file *file);
> >
> > +void intel_notify_mmio_flip(struct drm_device *dev,
> > + struct intel_ring_buffer *ring);
> > +
> > /* overlay */
> > extern struct intel_overlay_error_state *intel_overlay_capture_error_state(struct drm_device *dev);
> > extern void intel_overlay_print_error_state(struct drm_i915_error_state_buf *e,
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> > index 4b4aeb3..ad26abe 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -1080,6 +1080,8 @@ static void notify_ring(struct drm_device *dev,
> >
> > trace_i915_gem_request_complete(ring);
> >
> > + intel_notify_mmio_flip(dev, ring);
> > +
> > wake_up_all(&ring->irq_queue);
> > i915_queue_hangcheck(dev);
> > }
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 7e4ea8d..19004bf 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -8782,6 +8782,125 @@ err:
> > return ret;
> > }
> >
> > +static int intel_do_mmio_flip(struct drm_device *dev,
> > + struct drm_crtc *crtc)
> > +{
> > + struct drm_i915_private *dev_priv = dev->dev_private;
> > + struct intel_crtc *intel_crtc;
> > +
> > + intel_crtc = to_intel_crtc(crtc);
> > +
> > + intel_mark_page_flip_active(intel_crtc);
> > + return dev_priv->display.update_primary_plane(crtc, crtc->fb, 0, 0);
> > +}
> > +
> > +static bool intel_postpone_flip(struct drm_i915_gem_object *obj)
> > +{
> > + int ret;
> > + if (!obj->ring)
> > + return false;
> > +
> > + if (i915_seqno_passed(obj->ring->get_seqno(obj->ring, false),
> > + obj->last_write_seqno))
> > + return false;
> > +
> > + if (obj->last_write_seqno == obj->ring->outstanding_lazy_seqno) {
> > + ret = i915_add_request(obj->ring, NULL);
> > + if (WARN_ON(ret))
> > + return false;
> > + }
> > +
> > + if (WARN_ON(!obj->ring->irq_get(obj->ring)))
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > +void intel_notify_mmio_flip(struct drm_device *dev,
> > + struct intel_ring_buffer *ring)
> > +{
> > + struct drm_i915_private *dev_priv = dev->dev_private;
> > + struct drm_crtc *crtc;
> > + struct intel_crtc *intel_crtc;
> > + struct intel_mmio_flip *mmio_flip_data;
> > + unsigned long irq_flags;
> > + u32 seqno;
> > + enum pipe pipe;
> > +
> > + BUG_ON(!ring);
> > +
> > + seqno = ring->get_seqno(ring, false);
> > +
> > + spin_lock_irqsave(&dev_priv->mmio_flip_lock, irq_flags);
> > + for_each_pipe(pipe) {
> > + crtc = dev_priv->pipe_to_crtc_mapping[pipe];
> > + intel_crtc = to_intel_crtc(crtc);
> > + mmio_flip_data = &intel_crtc->mmio_flip_data;
> > + if ((mmio_flip_data->seqno != 0) &&
> > + (ring->id == mmio_flip_data->ring_id) &&
> > + (seqno >= mmio_flip_data->seqno)) {
> > + intel_do_mmio_flip(dev, crtc);
> > + mmio_flip_data->seqno = 0;
> > + ring->irq_put(ring);
> > + }
> > + }
> > +
> > + spin_unlock_irqrestore(&dev_priv->mmio_flip_lock, irq_flags);
> > +}
> > +
> > +/* Using MMIO based flips starting from VLV, for Media power well
> > + * residency optimization. The other alternative of having Render
> > + * ring based flip calls is not being used, as the performance
> > + * (FPS) of certain 3D Apps was getting severly affected.
> > + */
> > +static int intel_gen7_queue_mmio_flip(struct drm_device *dev,
> > + struct drm_crtc *crtc,
> > + struct drm_framebuffer *fb,
> > + struct drm_i915_gem_object *obj,
> > + uint32_t flags)
> > +{
> > + struct drm_i915_private *dev_priv = dev->dev_private;
> > + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > + unsigned long irq_flags;
> > + int ret;
> > +
> > + ret = intel_pin_and_fence_fb_obj(dev, obj, obj->ring);
> > + if (ret)
> > + goto err;
> > +
> > + switch (intel_crtc->plane) {
> > + case PLANE_A:
> > + case PLANE_B:
> > + case PLANE_C:
> > + break;
> > + default:
> > + WARN_ONCE(1, "unknown plane in flip command\n");
> > + ret = -ENODEV;
> > + goto err_unpin;
> > + }
> > +
> > + if (!intel_postpone_flip(obj)) {
> > + ret = intel_do_mmio_flip(dev, crtc);
> > + return ret;
> > + }
> > +
> > + spin_lock_irqsave(&dev_priv->mmio_flip_lock, irq_flags);
> > + intel_crtc->mmio_flip_data.seqno = obj->last_write_seqno;
> > + intel_crtc->mmio_flip_data.ring_id = obj->ring->id;
> > + spin_unlock_irqrestore(&dev_priv->mmio_flip_lock, irq_flags);
> > +
> > + /* Double check to catch cases where irq fired before
> > + * mmio flip data was ready
> > + */
> > + intel_notify_mmio_flip(dev, obj->ring);
> > + return 0;
> > +
> > +err_unpin:
> > + intel_unpin_fb_obj(obj);
> > +err:
> > + return ret;
> > +}
> > +
> > static int intel_gen7_queue_flip(struct drm_device *dev,
> > struct drm_crtc *crtc,
> > struct drm_framebuffer *fb,
> > @@ -10577,6 +10696,8 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
> > DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
> > intel_crtc->plane = !pipe;
> > }
> > + if (IS_VALLEYVIEW(dev))
> > + intel_crtc->mmio_flip_data.seqno = 0;
> >
> > BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
> > dev_priv->plane_to_crtc_mapping[intel_crtc->plane] != NULL);
> > @@ -11107,6 +11228,9 @@ static void intel_init_display(struct drm_device *dev)
> > }
> >
> > intel_panel_init_backlight_funcs(dev);
> > +
> > + if (IS_VALLEYVIEW(dev))
> > + dev_priv->display.queue_flip = intel_gen7_queue_mmio_flip;
> > }
> >
> > /*
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index fa99104..f0b26a1 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -344,6 +344,11 @@ struct intel_pipe_wm {
> > bool fbc_wm_enabled;
> > };
> >
> > +struct intel_mmio_flip {
> > + u32 seqno;
> > + u32 ring_id;
> > +};
> > +
> > struct intel_crtc {
> > struct drm_crtc base;
> > enum pipe pipe;
> > @@ -395,6 +400,8 @@ struct intel_crtc {
> > /* watermarks currently being used */
> > struct intel_pipe_wm active;
> > } wm;
> > +
> > + struct intel_mmio_flip mmio_flip_data;
> > };
> >
> > struct intel_plane_wm_parameters {
>
Hi Ville,
A gentle reminder to review the patch.
Thanks,
Sourab
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