1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_fb_pin.c b/drivers/gpu/drm/i915/display/intel_fb_pin.c
new file mode 100644
index 000000000000..3f77f3013584
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_fb_pin.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+/**
+ * DOC: display pinning helpers
+ */
+
+#include "intel_display_types.h"
+#include "intel_fb_pin.h"
+#include "intel_fb.h"
+
+#include "intel_dpt.h"
+
+#include "gem/i915_gem_object.h"
+
+static struct i915_vma *
+intel_pin_fb_obj_dpt(struct drm_framebuffer *fb,
+		     const struct i915_ggtt_view *view,
+		     bool uses_fence,
+		     unsigned long *out_flags,
+		     struct i915_address_space *vm)
+{
+	struct drm_device *dev = fb->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct i915_vma *vma;
+	u32 alignment;
+	int ret;
+
+	if (WARN_ON(!i915_gem_object_is_framebuffer(obj)))
+		return ERR_PTR(-EINVAL);
+
+	alignment = 4096 * 512;
+
+	atomic_inc(&dev_priv->gpu_error.pending_fb_pin);
+
+	ret = i915_gem_object_set_cache_level(obj, I915_CACHE_NONE);
+	if (ret) {
+		vma = ERR_PTR(ret);
+		goto err;
+	}
+
+	vma = i915_vma_instance(obj, vm, view);
+	if (IS_ERR(vma))
+		goto err;
+
+	if (i915_vma_misplaced(vma, 0, alignment, 0)) {
+		ret = i915_vma_unbind(vma);
+		if (ret) {
+			vma = ERR_PTR(ret);
+			goto err;
+		}
+	}
+
+	ret = i915_vma_pin(vma, 0, alignment, PIN_GLOBAL);
+	if (ret) {
+		vma = ERR_PTR(ret);
+		goto err;
+	}
+
+	vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
+
+	i915_gem_object_flush_if_display(obj);
+
+	i915_vma_get(vma);
+err:
+	atomic_dec(&dev_priv->gpu_error.pending_fb_pin);
+
+	return vma;
+}
+
+struct i915_vma *
+intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb,
+			   bool phys_cursor,
+			   const struct i915_ggtt_view *view,
+			   bool uses_fence,
+			   unsigned long *out_flags)
+{
+	struct drm_device *dev = fb->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	intel_wakeref_t wakeref;
+	struct i915_gem_ww_ctx ww;
+	struct i915_vma *vma;
+	unsigned int pinctl;
+	u32 alignment;
+	int ret;
+
+	if (drm_WARN_ON(dev, !i915_gem_object_is_framebuffer(obj)))
+		return ERR_PTR(-EINVAL);
+
+	if (phys_cursor)
+		alignment = intel_cursor_alignment(dev_priv);
+	else
+		alignment = intel_surf_alignment(fb, 0);
+	if (drm_WARN_ON(dev, alignment && !is_power_of_2(alignment)))
+		return ERR_PTR(-EINVAL);
+
+	/* Note that the w/a also requires 64 PTE of padding following the
+	 * bo. We currently fill all unused PTE with the shadow page and so
+	 * we should always have valid PTE following the scanout preventing
+	 * the VT-d warning.
+	 */
+	if (intel_scanout_needs_vtd_wa(dev_priv) && alignment < 256 * 1024)
+		alignment = 256 * 1024;
+
+	/*
+	 * Global gtt pte registers are special registers which actually forward
+	 * writes to a chunk of system memory. Which means that there is no risk
+	 * that the register values disappear as soon as we call
+	 * intel_runtime_pm_put(), so it is correct to wrap only the
+	 * pin/unpin/fence and not more.
+	 */
+	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);
+
+	atomic_inc(&dev_priv->gpu_error.pending_fb_pin);
+
+	/*
+	 * Valleyview is definitely limited to scanning out the first
+	 * 512MiB. Lets presume this behaviour was inherited from the
+	 * g4x display engine and that all earlier gen are similarly
+	 * limited. Testing suggests that it is a little more
+	 * complicated than this. For example, Cherryview appears quite
+	 * happy to scanout from anywhere within its global aperture.
+	 */
+	pinctl = 0;
+	if (HAS_GMCH(dev_priv))
+		pinctl |= PIN_MAPPABLE;
+
+	i915_gem_ww_ctx_init(&ww, true);
+retry:
+	ret = i915_gem_object_lock(obj, &ww);
+	if (!ret && phys_cursor)
+		ret = i915_gem_object_attach_phys(obj, alignment);
+	else if (!ret && HAS_LMEM(dev_priv))
+		ret = i915_gem_object_migrate(obj, &ww, INTEL_REGION_LMEM);
+	/* TODO: Do we need to sync when migration becomes async? */
+	if (!ret)
+		ret = i915_gem_object_pin_pages(obj);
+	if (ret)
+		goto err;
+
+	if (!ret) {
+		vma = i915_gem_object_pin_to_display_plane(obj, &ww, alignment,
+							   view, pinctl);
+		if (IS_ERR(vma)) {
+			ret = PTR_ERR(vma);
+			goto err_unpin;
+		}
+	}
+
+	if (uses_fence && i915_vma_is_map_and_fenceable(vma)) {
+		/*
+		 * Install a fence for tiled scan-out. Pre-i965 always needs a
+		 * fence, whereas 965+ only requires a fence if using
+		 * framebuffer compression.  For simplicity, we always, when
+		 * possible, install a fence as the cost is not that onerous.
+		 *
+		 * If we fail to fence the tiled scanout, then either the
+		 * modeset will reject the change (which is highly unlikely as
+		 * the affected systems, all but one, do not have unmappable
+		 * space) or we will not be able to enable full powersaving
+		 * techniques (also likely not to apply due to various limits
+		 * FBC and the like impose on the size of the buffer, which
+		 * presumably we violated anyway with this unmappable buffer).
+		 * Anyway, it is presumably better to stumble onwards with
+		 * something and try to run the system in a "less than optimal"
+		 * mode that matches the user configuration.
+		 */
+		ret = i915_vma_pin_fence(vma);
+		if (ret != 0 && DISPLAY_VER(dev_priv) < 4) {
+			i915_vma_unpin(vma);
+			goto err_unpin;
+		}
+		ret = 0;
+
+		if (vma->fence)
+			*out_flags |= PLANE_HAS_FENCE;
+	}
+
+	i915_vma_get(vma);
+
+err_unpin:
+	i915_gem_object_unpin_pages(obj);
+err:
+	if (ret == -EDEADLK) {
+		ret = i915_gem_ww_ctx_backoff(&ww);
+		if (!ret)
+			goto retry;
+	}
+	i915_gem_ww_ctx_fini(&ww);
+	if (ret)
+		vma = ERR_PTR(ret);
+
+	atomic_dec(&dev_priv->gpu_error.pending_fb_pin);
+	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);
+	return vma;
+}
+
+void intel_unpin_fb_vma(struct i915_vma *vma, unsigned long flags)
+{
+	if (flags & PLANE_HAS_FENCE)
+		i915_vma_unpin_fence(vma);
+	i915_vma_unpin(vma);
+	i915_vma_put(vma);
+}
+
+int intel_plane_pin_fb(struct intel_plane_state *plane_state)
+{
+	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
+	struct drm_framebuffer *fb = plane_state->hw.fb;
+	struct i915_vma *vma;
+	bool phys_cursor =
+		plane->id == PLANE_CURSOR &&
+		INTEL_INFO(dev_priv)->display.cursor_needs_physical;
+
+	if (!intel_fb_uses_dpt(fb)) {
+		vma = intel_pin_and_fence_fb_obj(fb, phys_cursor,
+						 &plane_state->view.gtt,
+						 intel_plane_uses_fence(plane_state),
+						 &plane_state->flags);
+		if (IS_ERR(vma))
+			return PTR_ERR(vma);
+
+		plane_state->ggtt_vma = vma;
+	} else {
+		struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
+
+		vma = intel_dpt_pin(intel_fb->dpt_vm);
+		if (IS_ERR(vma))
+			return PTR_ERR(vma);
+
+		plane_state->ggtt_vma = vma;
+
+		vma = intel_pin_fb_obj_dpt(fb, &plane_state->view.gtt, false,
+					   &plane_state->flags, intel_fb->dpt_vm);
+		if (IS_ERR(vma)) {
+			intel_dpt_unpin(intel_fb->dpt_vm);
+			plane_state->ggtt_vma = NULL;
+			return PTR_ERR(vma);
+		}
+
+		plane_state->dpt_vma = vma;
+
+		WARN_ON(plane_state->ggtt_vma == plane_state->dpt_vma);
+	}
+
+	return 0;
+}
+
+void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
+{
+	struct drm_framebuffer *fb = old_plane_state->hw.fb;
+	struct i915_vma *vma;
+
+	if (!intel_fb_uses_dpt(fb)) {
+		vma = fetch_and_zero(&old_plane_state->ggtt_vma);
+		if (vma)
+			intel_unpin_fb_vma(vma, old_plane_state->flags);
+	} else {
+		struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
+
+		vma = fetch_and_zero(&old_plane_state->dpt_vma);
+		if (vma)
+			intel_unpin_fb_vma(vma, old_plane_state->flags);
+
+		vma = fetch_and_zero(&old_plane_state->ggtt_vma);
+		if (vma)
+			intel_dpt_unpin(intel_fb->dpt_vm);
+	}
+}