On Thu, Sep 06, 2018 at 08:01:43PM +0100, Chris Wilson wrote: > Given that we are now reasonably confident in our ability to detect and > reserve the stolen memory (physical memory reserved for graphics by the > BIOS) for ourselves on most machines, we can put it to use. In this > case, we need a page to hold the overlay registers. > > On an i915g running MythTv, H Buus noticed that > > commit 6a2c4232ece145d8b5a8f95f767bd6d0d2d2f2bb > Author: Chris Wilson <ch...@chris-wilson.co.uk> > Date: Tue Nov 4 04:51:40 2014 -0800 > drm/i915: Make the physical object coherent with GTT > > introduced stuttering into his video playback. After discarding the > likely suspect of it being the physical cursor updates, we were left > with the use of the phys object for the overlay. And lo, if we > completely avoid using the phys object (allocated just once on module > load!) by switching to stolen memory, the stuttering goes away. > > For lack of a better explanation, claim victory and kill two birds with > one stone.
A but peculiar. But looks fine to me. And we should have some stolen pretty much everywhere. I guess my only concern is permanently fragmenting stolen with this. Or does the allocator grab it from the very end? Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com> > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107600 > Fixes: 6a2c4232ece1 ("drm/i915: Make the physical object coherent with GTT") > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> > --- > drivers/gpu/drm/i915/intel_overlay.c | 228 +++++++++------------------ > 1 file changed, 75 insertions(+), 153 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_overlay.c > b/drivers/gpu/drm/i915/intel_overlay.c > index c2f10d899329..443dfaefd7a6 100644 > --- a/drivers/gpu/drm/i915/intel_overlay.c > +++ b/drivers/gpu/drm/i915/intel_overlay.c > @@ -181,8 +181,9 @@ struct intel_overlay { > u32 brightness, contrast, saturation; > u32 old_xscale, old_yscale; > /* register access */ > - u32 flip_addr; > struct drm_i915_gem_object *reg_bo; > + struct overlay_registers __iomem *regs; > + u32 flip_addr; > /* flip handling */ > struct i915_gem_active last_flip; > }; > @@ -210,29 +211,6 @@ static void i830_overlay_clock_gating(struct > drm_i915_private *dev_priv, > PCI_DEVFN(0, 0), I830_CLOCK_GATE, val); > } > > -static struct overlay_registers __iomem * > -intel_overlay_map_regs(struct intel_overlay *overlay) > -{ > - struct drm_i915_private *dev_priv = overlay->i915; > - struct overlay_registers __iomem *regs; > - > - if (OVERLAY_NEEDS_PHYSICAL(dev_priv)) > - regs = (struct overlay_registers __iomem > *)overlay->reg_bo->phys_handle->vaddr; > - else > - regs = io_mapping_map_wc(&dev_priv->ggtt.iomap, > - overlay->flip_addr, > - PAGE_SIZE); > - > - return regs; > -} > - > -static void intel_overlay_unmap_regs(struct intel_overlay *overlay, > - struct overlay_registers __iomem *regs) > -{ > - if (!OVERLAY_NEEDS_PHYSICAL(overlay->i915)) > - io_mapping_unmap(regs); > -} > - > static void intel_overlay_submit_request(struct intel_overlay *overlay, > struct i915_request *rq, > i915_gem_retire_fn retire) > @@ -784,13 +762,13 @@ static int intel_overlay_do_put_image(struct > intel_overlay *overlay, > struct drm_i915_gem_object *new_bo, > struct put_image_params *params) > { > - int ret, tmp_width; > - struct overlay_registers __iomem *regs; > - bool scale_changed = false; > + struct overlay_registers __iomem *regs = overlay->regs; > struct drm_i915_private *dev_priv = overlay->i915; > u32 swidth, swidthsw, sheight, ostride; > enum pipe pipe = overlay->crtc->pipe; > + bool scale_changed = false; > struct i915_vma *vma; > + int ret, tmp_width; > > lockdep_assert_held(&dev_priv->drm.struct_mutex); > > WARN_ON(!drm_modeset_is_locked(&dev_priv->drm.mode_config.connection_mutex)); > @@ -815,30 +793,19 @@ static int intel_overlay_do_put_image(struct > intel_overlay *overlay, > > if (!overlay->active) { > u32 oconfig; > - regs = intel_overlay_map_regs(overlay); > - if (!regs) { > - ret = -ENOMEM; > - goto out_unpin; > - } > + > oconfig = OCONF_CC_OUT_8BIT; > if (IS_GEN4(dev_priv)) > oconfig |= OCONF_CSC_MODE_BT709; > oconfig |= pipe == 0 ? > OCONF_PIPE_A : OCONF_PIPE_B; > iowrite32(oconfig, ®s->OCONFIG); > - intel_overlay_unmap_regs(overlay, regs); > > ret = intel_overlay_on(overlay); > if (ret != 0) > goto out_unpin; > } > > - regs = intel_overlay_map_regs(overlay); > - if (!regs) { > - ret = -ENOMEM; > - goto out_unpin; > - } > - > iowrite32((params->dst_y << 16) | params->dst_x, ®s->DWINPOS); > iowrite32((params->dst_h << 16) | params->dst_w, ®s->DWINSZ); > > @@ -882,8 +849,6 @@ static int intel_overlay_do_put_image(struct > intel_overlay *overlay, > > iowrite32(overlay_cmd_reg(params), ®s->OCMD); > > - intel_overlay_unmap_regs(overlay, regs); > - > ret = intel_overlay_continue(overlay, vma, scale_changed); > if (ret) > goto out_unpin; > @@ -901,7 +866,6 @@ static int intel_overlay_do_put_image(struct > intel_overlay *overlay, > int intel_overlay_switch_off(struct intel_overlay *overlay) > { > struct drm_i915_private *dev_priv = overlay->i915; > - struct overlay_registers __iomem *regs; > int ret; > > lockdep_assert_held(&dev_priv->drm.struct_mutex); > @@ -918,9 +882,7 @@ int intel_overlay_switch_off(struct intel_overlay > *overlay) > if (ret != 0) > return ret; > > - regs = intel_overlay_map_regs(overlay); > - iowrite32(0, ®s->OCMD); > - intel_overlay_unmap_regs(overlay, regs); > + iowrite32(0, &overlay->regs->OCMD); > > return intel_overlay_off(overlay); > } > @@ -1305,7 +1267,6 @@ int intel_overlay_attrs_ioctl(struct drm_device *dev, > void *data, > struct drm_intel_overlay_attrs *attrs = data; > struct drm_i915_private *dev_priv = to_i915(dev); > struct intel_overlay *overlay; > - struct overlay_registers __iomem *regs; > int ret; > > overlay = dev_priv->overlay; > @@ -1345,15 +1306,7 @@ int intel_overlay_attrs_ioctl(struct drm_device *dev, > void *data, > overlay->contrast = attrs->contrast; > overlay->saturation = attrs->saturation; > > - regs = intel_overlay_map_regs(overlay); > - if (!regs) { > - ret = -ENOMEM; > - goto out_unlock; > - } > - > - update_reg_attrs(overlay, regs); > - > - intel_overlay_unmap_regs(overlay, regs); > + update_reg_attrs(overlay, overlay->regs); > > if (attrs->flags & I915_OVERLAY_UPDATE_GAMMA) { > if (IS_GEN2(dev_priv)) > @@ -1386,12 +1339,47 @@ int intel_overlay_attrs_ioctl(struct drm_device *dev, > void *data, > return ret; > } > > +static int get_registers(struct intel_overlay *overlay, bool use_phys) > +{ > + struct drm_i915_gem_object *obj; > + struct i915_vma *vma; > + int err; > + > + obj = i915_gem_object_create_stolen(overlay->i915, PAGE_SIZE); > + if (obj == NULL) > + obj = i915_gem_object_create_internal(overlay->i915, PAGE_SIZE); > + if (IS_ERR(obj)) > + return PTR_ERR(obj); > + > + vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE); > + if (IS_ERR(vma)) { > + err = PTR_ERR(vma); > + goto err_put_bo; > + } > + > + if (use_phys) > + overlay->flip_addr = sg_dma_address(obj->mm.pages->sgl); > + else > + overlay->flip_addr = i915_ggtt_offset(vma); > + overlay->regs = i915_vma_pin_iomap(vma); > + i915_vma_unpin(vma); > + > + if (IS_ERR(overlay->regs)) { > + err = PTR_ERR(overlay->regs); > + goto err_put_bo; > + } > + > + overlay->reg_bo = obj; > + return 0; > + > +err_put_bo: > + i915_gem_object_put(obj); > + return err; > +} > + > void intel_setup_overlay(struct drm_i915_private *dev_priv) > { > struct intel_overlay *overlay; > - struct drm_i915_gem_object *reg_bo; > - struct overlay_registers __iomem *regs; > - struct i915_vma *vma = NULL; > int ret; > > if (!HAS_OVERLAY(dev_priv)) > @@ -1401,46 +1389,8 @@ void intel_setup_overlay(struct drm_i915_private > *dev_priv) > if (!overlay) > return; > > - mutex_lock(&dev_priv->drm.struct_mutex); > - if (WARN_ON(dev_priv->overlay)) > - goto out_free; > - > overlay->i915 = dev_priv; > > - reg_bo = NULL; > - if (!OVERLAY_NEEDS_PHYSICAL(dev_priv)) > - reg_bo = i915_gem_object_create_stolen(dev_priv, PAGE_SIZE); > - if (reg_bo == NULL) > - reg_bo = i915_gem_object_create(dev_priv, PAGE_SIZE); > - if (IS_ERR(reg_bo)) > - goto out_free; > - overlay->reg_bo = reg_bo; > - > - if (OVERLAY_NEEDS_PHYSICAL(dev_priv)) { > - ret = i915_gem_object_attach_phys(reg_bo, PAGE_SIZE); > - if (ret) { > - DRM_ERROR("failed to attach phys overlay regs\n"); > - goto out_free_bo; > - } > - overlay->flip_addr = reg_bo->phys_handle->busaddr; > - } else { > - vma = i915_gem_object_ggtt_pin(reg_bo, NULL, > - 0, PAGE_SIZE, PIN_MAPPABLE); > - if (IS_ERR(vma)) { > - DRM_ERROR("failed to pin overlay register bo\n"); > - ret = PTR_ERR(vma); > - goto out_free_bo; > - } > - overlay->flip_addr = i915_ggtt_offset(vma); > - > - ret = i915_gem_object_set_to_gtt_domain(reg_bo, true); > - if (ret) { > - DRM_ERROR("failed to move overlay register bo into the > GTT\n"); > - goto out_unpin_bo; > - } > - } > - > - /* init all values */ > overlay->color_key = 0x0101fe; > overlay->color_key_enabled = true; > overlay->brightness = -19; > @@ -1449,44 +1399,51 @@ void intel_setup_overlay(struct drm_i915_private > *dev_priv) > > init_request_active(&overlay->last_flip, NULL); > > - regs = intel_overlay_map_regs(overlay); > - if (!regs) > - goto out_unpin_bo; > + mutex_lock(&dev_priv->drm.struct_mutex); > + > + ret = get_registers(overlay, OVERLAY_NEEDS_PHYSICAL(dev_priv)); > + if (ret) > + goto out_free; > + > + ret = i915_gem_object_set_to_gtt_domain(overlay->reg_bo, true); > + if (ret) > + goto out_reg_bo; > > - memset_io(regs, 0, sizeof(struct overlay_registers)); > - update_polyphase_filter(regs); > - update_reg_attrs(overlay, regs); > + mutex_unlock(&dev_priv->drm.struct_mutex); > > - intel_overlay_unmap_regs(overlay, regs); > + memset_io(overlay->regs, 0, sizeof(struct overlay_registers)); > + update_polyphase_filter(overlay->regs); > + update_reg_attrs(overlay, overlay->regs); > > dev_priv->overlay = overlay; > - mutex_unlock(&dev_priv->drm.struct_mutex); > - DRM_INFO("initialized overlay support\n"); > + DRM_INFO("Initialized overlay support.\n"); > return; > > -out_unpin_bo: > - if (vma) > - i915_vma_unpin(vma); > -out_free_bo: > - i915_gem_object_put(reg_bo); > +out_reg_bo: > + i915_gem_object_put(overlay->reg_bo); > out_free: > mutex_unlock(&dev_priv->drm.struct_mutex); > kfree(overlay); > - return; > } > > void intel_cleanup_overlay(struct drm_i915_private *dev_priv) > { > - if (!dev_priv->overlay) > + struct intel_overlay *overlay; > + > + overlay = fetch_and_zero(&dev_priv->overlay); > + if (!overlay) > return; > > - /* The bo's should be free'd by the generic code already. > + /* > + * The bo's should be free'd by the generic code already. > * Furthermore modesetting teardown happens beforehand so the > - * hardware should be off already */ > - WARN_ON(dev_priv->overlay->active); > + * hardware should be off already. > + */ > + WARN_ON(overlay->active); > + > + i915_gem_object_put(overlay->reg_bo); > > - i915_gem_object_put(dev_priv->overlay->reg_bo); > - kfree(dev_priv->overlay); > + kfree(overlay); > } > > #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) > @@ -1498,37 +1455,11 @@ struct intel_overlay_error_state { > u32 isr; > }; > > -static struct overlay_registers __iomem * > -intel_overlay_map_regs_atomic(struct intel_overlay *overlay) > -{ > - struct drm_i915_private *dev_priv = overlay->i915; > - struct overlay_registers __iomem *regs; > - > - if (OVERLAY_NEEDS_PHYSICAL(dev_priv)) > - /* Cast to make sparse happy, but it's wc memory anyway, so > - * equivalent to the wc io mapping on X86. */ > - regs = (struct overlay_registers __iomem *) > - overlay->reg_bo->phys_handle->vaddr; > - else > - regs = io_mapping_map_atomic_wc(&dev_priv->ggtt.iomap, > - overlay->flip_addr); > - > - return regs; > -} > - > -static void intel_overlay_unmap_regs_atomic(struct intel_overlay *overlay, > - struct overlay_registers __iomem *regs) > -{ > - if (!OVERLAY_NEEDS_PHYSICAL(overlay->i915)) > - io_mapping_unmap_atomic(regs); > -} > - > struct intel_overlay_error_state * > intel_overlay_capture_error_state(struct drm_i915_private *dev_priv) > { > struct intel_overlay *overlay = dev_priv->overlay; > struct intel_overlay_error_state *error; > - struct overlay_registers __iomem *regs; > > if (!overlay || !overlay->active) > return NULL; > @@ -1541,18 +1472,9 @@ intel_overlay_capture_error_state(struct > drm_i915_private *dev_priv) > error->isr = I915_READ(ISR); > error->base = overlay->flip_addr; > > - regs = intel_overlay_map_regs_atomic(overlay); > - if (!regs) > - goto err; > - > - memcpy_fromio(&error->regs, regs, sizeof(struct overlay_registers)); > - intel_overlay_unmap_regs_atomic(overlay, regs); > + memcpy_fromio(&error->regs, overlay->regs, sizeof(error->regs)); > > return error; > - > -err: > - kfree(error); > - return NULL; > } > > void > -- > 2.19.0.rc2 -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
