[Intel-gfx] [PATCH 2/2] drm/i915/display: Be explicit in handling the preallocated vma
Ville Syrjälä
ville.syrjala at linux.intel.com
Tue Feb 4 14:26:23 UTC 2020
On Tue, Feb 04, 2020 at 09:48:02AM +0000, Chris Wilson wrote:
> As only the display codes tries to pin its preallocated framebuffer into
> an exact location in the GGTT, remove the convenience function and make
> the pin management explicit in the display code. Then throughout the
> display management, we track the framebuffer and its plane->vma; with
> less single purpose code and ready for first class i915_vma.
>
> In doing so, this should fix the BUG_ON(vma->pages) on fi-kbl-soraka.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
> Ville, you mentioned you had a plan... This should prevent an oops during
> boot for kbl-soraka, so it would be nice :)
> -Chris
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 141 +++++++++++-------
> .../drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 82 ++--------
> drivers/gpu/drm/i915/gem/i915_gem_stolen.h | 1 -
> drivers/gpu/drm/i915/gt/intel_rc6.c | 1 -
> 5 files changed, 102 insertions(+), 124 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index b07971204492..c3695317d74a 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -3389,6 +3389,68 @@ int skl_format_to_fourcc(int format, bool rgb_order, bool alpha)
> }
> }
>
> +static struct i915_vma *
> +initial_plane_vma(struct drm_i915_private *i915,
> + struct intel_initial_plane_config *plane_config)
> +{
> + struct drm_i915_gem_object *obj;
> + struct i915_vma *vma;
> + u32 base, size;
> +
> + if (plane_config->size == 0)
> + return NULL;
> +
> + base = round_down(plane_config->base,
> + I915_GTT_MIN_ALIGNMENT);
> + size = round_up(plane_config->base + plane_config->size,
> + I915_GTT_MIN_ALIGNMENT);
> + size -= base;
> +
> + /*
> + * If the FB is too big, just don't use it since fbdev is not very
> + * important and we should probably use that space with FBC or other
> + * features.
> + */
> + if (size * 2 > i915->stolen_usable_size)
> + return NULL;
> +
> + obj = i915_gem_object_create_stolen_for_preallocated(i915, base, size);
> + if (IS_ERR(obj))
> + return NULL;
> +
> + switch (plane_config->tiling) {
> + case I915_TILING_NONE:
> + break;
> + case I915_TILING_X:
> + case I915_TILING_Y:
> + obj->tiling_and_stride =
> + plane_config->fb->base.pitches[0] |
> + plane_config->tiling;
> + break;
> + default:
> + MISSING_CASE(plane_config->tiling);
> + goto err_obj;
> + }
> +
> + vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
> + if (IS_ERR(vma))
> + goto err_obj;
> +
> + if (i915_vma_pin(vma, 0, 0,
> + PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | base))
> + goto err_obj;
> +
> + if (i915_gem_object_is_tiled(obj) &&
> + !i915_vma_is_map_and_fenceable(vma))
> + goto err_obj;
> +
> + return vma;
> +
> +err_obj:
> + i915_gem_object_put(obj);
> + return NULL;
> +}
> +
> static bool
> intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
> struct intel_initial_plane_config *plane_config)
> @@ -3397,22 +3459,7 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_mode_fb_cmd2 mode_cmd = { 0 };
> struct drm_framebuffer *fb = &plane_config->fb->base;
> - u32 base_aligned = round_down(plane_config->base, PAGE_SIZE);
> - u32 size_aligned = round_up(plane_config->base + plane_config->size,
> - PAGE_SIZE);
> - struct drm_i915_gem_object *obj;
> - bool ret = false;
> -
> - size_aligned -= base_aligned;
> -
> - if (plane_config->size == 0)
> - return false;
> -
> - /* If the FB is too big, just don't use it since fbdev is not very
> - * important and we should probably use that space with FBC or other
> - * features. */
> - if (size_aligned * 2 > dev_priv->stolen_usable_size)
> - return false;
> + struct i915_vma *vma;
>
> switch (fb->modifier) {
> case DRM_FORMAT_MOD_LINEAR:
> @@ -3426,25 +3473,10 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
> return false;
> }
>
> - obj = i915_gem_object_create_stolen_for_preallocated(dev_priv,
> - base_aligned,
> - base_aligned,
> - size_aligned);
> - if (IS_ERR(obj))
> + vma = initial_plane_vma(dev_priv, plane_config);
> + if (!vma)
> return false;
>
> - switch (plane_config->tiling) {
> - case I915_TILING_NONE:
> - break;
> - case I915_TILING_X:
> - case I915_TILING_Y:
> - obj->tiling_and_stride = fb->pitches[0] | plane_config->tiling;
> - break;
> - default:
> - MISSING_CASE(plane_config->tiling);
> - goto out;
> - }
> -
> mode_cmd.pixel_format = fb->format->format;
> mode_cmd.width = fb->width;
> mode_cmd.height = fb->height;
> @@ -3452,17 +3484,18 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
> mode_cmd.modifier[0] = fb->modifier;
> mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
>
> - if (intel_framebuffer_init(to_intel_framebuffer(fb), obj, &mode_cmd)) {
> + if (intel_framebuffer_init(to_intel_framebuffer(fb),
> + vma->obj, &mode_cmd)) {
> drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
> - goto out;
> + goto err_vma;
> }
>
> + plane_config->vma = vma;
> + return true;
>
> - drm_dbg_kms(&dev_priv->drm, "initial plane fb obj %p\n", obj);
> - ret = true;
> -out:
> - i915_gem_object_put(obj);
> - return ret;
> +err_vma:
> + i915_vma_put(vma);
> + return false;
> }
>
> static void
> @@ -3561,12 +3594,14 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
> struct intel_plane_state *intel_state =
> to_intel_plane_state(plane_state);
> struct drm_framebuffer *fb;
> + struct i915_vma *vma;
>
> if (!plane_config->fb)
> return;
>
> if (intel_alloc_initial_plane_obj(intel_crtc, plane_config)) {
> fb = &plane_config->fb->base;
> + vma = plane_config->vma;
> goto valid_fb;
> }
>
> @@ -3589,6 +3624,7 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
>
> if (intel_plane_ggtt_offset(state) == plane_config->base) {
> fb = state->hw.fb;
> + vma = state->vma;
> goto valid_fb;
> }
> }
> @@ -3611,21 +3647,11 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
> intel_state->color_plane[0].stride =
> intel_fb_pitch(fb, 0, intel_state->hw.rotation);
>
> - intel_state->vma =
> - intel_pin_and_fence_fb_obj(fb,
> - &intel_state->view,
> - intel_plane_uses_fence(intel_state),
> - &intel_state->flags);
> - if (IS_ERR(intel_state->vma)) {
> - drm_err(&dev_priv->drm,
> - "failed to pin boot fb on pipe %d: %li\n",
> - intel_crtc->pipe, PTR_ERR(intel_state->vma));
> -
> - intel_state->vma = NULL;
> - return;
> - }
> -
> - intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);
> + __i915_vma_pin(vma);
> + intel_state->vma = i915_vma_get(vma);
> + if (intel_plane_uses_fence(intel_state) && i915_vma_pin_fence(vma) == 0)
> + if (vma->fence)
> + intel_state->flags |= PLANE_HAS_FENCE;
Was slighly worried whether the gen2/3 special case would be needed
here, but I doubt we could get this far on those anyway since the
BIOS will be using VGA mode anyway. And even if we did I guess there's
no real way we wouldn't be able to get the fence.
>
> plane_state->src_x = 0;
> plane_state->src_y = 0;
> @@ -3649,6 +3675,8 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
> plane_state->crtc = &intel_crtc->base;
> intel_plane_copy_uapi_to_hw_state(intel_state, intel_state);
>
> + intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);
> +
> atomic_or(to_intel_plane(primary)->frontbuffer_bit,
> &to_intel_frontbuffer(fb)->bits);
> }
> @@ -17863,6 +17891,9 @@ static void plane_config_fini(struct intel_initial_plane_config *plane_config)
> else
> kfree(fb);
> }
> +
> + if (plane_config->vma)
> + i915_vma_put(plane_config->vma);
> }
>
> int intel_modeset_init(struct drm_i915_private *i915)
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 7c6133a9c51b..7ae0bc8b80d1 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -592,6 +592,7 @@ struct intel_plane_state {
>
> struct intel_initial_plane_config {
> struct intel_framebuffer *fb;
> + struct i915_vma *vma;
> unsigned int tiling;
> int size;
> u32 base;
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> index b47e7109be6a..491cfbaaa330 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> @@ -686,28 +686,24 @@ struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915)
> struct drm_i915_gem_object *
> i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
> resource_size_t stolen_offset,
> - resource_size_t gtt_offset,
> resource_size_t size)
> {
> struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN];
> - struct i915_ggtt *ggtt = &i915->ggtt;
> struct drm_i915_gem_object *obj;
> struct drm_mm_node *stolen;
> - struct i915_vma *vma;
> int ret;
>
> if (!drm_mm_initialized(&i915->mm.stolen))
> return ERR_PTR(-ENODEV);
>
> drm_dbg(&i915->drm,
> - "creating preallocated stolen object: stolen_offset=%pa, gtt_offset=%pa, size=%pa\n",
> - &stolen_offset, >t_offset, &size);
> + "creating preallocated stolen object: stolen_offset=%pa, size=%pa\n",
> + &stolen_offset, &size);
>
> /* KISS and expect everything to be page-aligned */
> - if (drm_WARN_ON(&i915->drm, size == 0) ||
> - drm_WARN_ON(&i915->drm, !IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
> - drm_WARN_ON(&i915->drm,
> - !IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
> + if (GEM_WARN_ON(size == 0) ||
> + GEM_WARN_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE)) ||
> + GEM_WARN_ON(!IS_ALIGNED(stolen_offset, I915_GTT_MIN_ALIGNMENT)))
Were these intentional?
> return ERR_PTR(-EINVAL);
>
> stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
> @@ -720,68 +716,20 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915,
> ret = drm_mm_reserve_node(&i915->mm.stolen, stolen);
> mutex_unlock(&i915->mm.stolen_lock);
> if (ret) {
> - drm_dbg(&i915->drm, "failed to allocate stolen space\n");
> - kfree(stolen);
> - return ERR_PTR(ret);
> + obj = ERR_PTR(ret);
> + goto err_free;
> }
>
> obj = __i915_gem_object_create_stolen(mem, stolen);
> - if (IS_ERR(obj)) {
> - drm_dbg(&i915->drm, "failed to allocate stolen object\n");
> - i915_gem_stolen_remove_node(i915, stolen);
> - kfree(stolen);
> - return obj;
> - }
> -
> - /* Some objects just need physical mem from stolen space */
> - if (gtt_offset == I915_GTT_OFFSET_NONE)
> - return obj;
> -
> - ret = i915_gem_object_pin_pages(obj);
> - if (ret)
> - goto err;
> -
> - vma = i915_vma_instance(obj, &ggtt->vm, NULL);
> - if (IS_ERR(vma)) {
> - ret = PTR_ERR(vma);
> - goto err_pages;
> - }
> -
> - /* To simplify the initialisation sequence between KMS and GTT,
> - * we allow construction of the stolen object prior to
> - * setting up the GTT space. The actual reservation will occur
> - * later.
> - */
> - mutex_lock(&ggtt->vm.mutex);
> - ret = i915_gem_gtt_reserve(&ggtt->vm, &vma->node,
> - size, gtt_offset, obj->cache_level,
> - 0);
> - if (ret) {
> - drm_dbg(&i915->drm, "failed to allocate stolen GTT space\n");
> - mutex_unlock(&ggtt->vm.mutex);
> - goto err_pages;
> - }
> -
> - GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
> -
> - GEM_BUG_ON(vma->pages);
> - vma->pages = obj->mm.pages;
> - atomic_set(&vma->pages_count, I915_VMA_PAGES_ACTIVE);
> -
> - set_bit(I915_VMA_GLOBAL_BIND_BIT, __i915_vma_flags(vma));
> - __i915_vma_set_map_and_fenceable(vma);
> -
> - list_add_tail(&vma->vm_link, &ggtt->vm.bound_list);
> - mutex_unlock(&ggtt->vm.mutex);
> -
> - GEM_BUG_ON(i915_gem_object_is_shrinkable(obj));
> - atomic_inc(&obj->bind_count);
> + if (IS_ERR(obj))
> + goto err_stolen;
>
> + i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
Moved here from pin_and_fence() I guess. Do we overwrite the PTEs
when we pin the vma? Or just assuming they already match this?
IIRC we anyway assume that ggtt has a 1:1 mapping of stolen at this
point and we don't double check that the PTEs really point to stolen.
Looks all right to me. Series is
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> return obj;
>
> -err_pages:
> - i915_gem_object_unpin_pages(obj);
> -err:
> - i915_gem_object_put(obj);
> - return ERR_PTR(ret);
> +err_stolen:
> + i915_gem_stolen_remove_node(i915, stolen);
> +err_free:
> + kfree(stolen);
> + return obj;
> }
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
> index c1040627fbf3..e15c0adad8af 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
> @@ -28,7 +28,6 @@ i915_gem_object_create_stolen(struct drm_i915_private *dev_priv,
> struct drm_i915_gem_object *
> i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv,
> resource_size_t stolen_offset,
> - resource_size_t gtt_offset,
> resource_size_t size);
>
> #endif /* __I915_GEM_STOLEN_H__ */
> diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
> index 01a99fdbb3c4..cc0882ee2a80 100644
> --- a/drivers/gpu/drm/i915/gt/intel_rc6.c
> +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
> @@ -299,7 +299,6 @@ static int vlv_rc6_init(struct intel_rc6 *rc6)
> pcbr_offset = (pcbr & ~4095) - i915->dsm.start;
> pctx = i915_gem_object_create_stolen_for_preallocated(i915,
> pcbr_offset,
> - I915_GTT_OFFSET_NONE,
> pctx_size);
> if (IS_ERR(pctx))
> return PTR_ERR(pctx);
> --
> 2.25.0
--
Ville Syrjälä
Intel
More information about the Intel-gfx
mailing list