1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/display/xe_plane_initial.c b/drivers/gpu/drm/xe/display/xe_plane_initial.c
new file mode 100644
index 000000000..ccf83c12b
--- /dev/null
+++ b/drivers/gpu/drm/xe/display/xe_plane_initial.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+/* for ioread64 */
+#include <linux/io-64-nonatomic-lo-hi.h>
+
+#include "xe_ggtt.h"
+
+#include "i915_drv.h"
+#include "intel_atomic_plane.h"
+#include "intel_display.h"
+#include "intel_display_types.h"
+#include "intel_fb.h"
+#include "intel_fb_pin.h"
+#include "intel_frontbuffer.h"
+#include "intel_plane_initial.h"
+
+static bool
+intel_reuse_initial_plane_obj(struct drm_i915_private *i915,
+			      const struct intel_initial_plane_config *plane_config,
+			      struct drm_framebuffer **fb)
+{
+	struct intel_crtc *crtc;
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+		struct intel_plane *plane =
+			to_intel_plane(crtc->base.primary);
+		struct intel_plane_state *plane_state =
+			to_intel_plane_state(plane->base.state);
+
+		if (!crtc_state->uapi.active)
+			continue;
+
+		if (!plane_state->ggtt_vma)
+			continue;
+
+		if (intel_plane_ggtt_offset(plane_state) == plane_config->base) {
+			*fb = plane_state->hw.fb;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static struct xe_bo *
+initial_plane_bo(struct xe_device *xe,
+		 struct intel_initial_plane_config *plane_config)
+{
+	struct xe_tile *tile0 = xe_device_get_root_tile(xe);
+	struct xe_bo *bo;
+	resource_size_t phys_base;
+	u32 base, size, flags;
+	u64 page_size = xe->info.vram_flags & XE_VRAM_FLAGS_NEED64K ? SZ_64K : SZ_4K;
+
+	if (plane_config->size == 0)
+		return NULL;
+
+	flags = XE_BO_CREATE_PINNED_BIT | XE_BO_SCANOUT_BIT | XE_BO_CREATE_GGTT_BIT;
+
+	base = round_down(plane_config->base, page_size);
+	if (IS_DGFX(xe)) {
+		u64 __iomem *gte = tile0->mem.ggtt->gsm;
+		u64 pte;
+
+		gte += base / XE_PAGE_SIZE;
+
+		pte = ioread64(gte);
+		if (!(pte & XE_GGTT_PTE_DM)) {
+			drm_err(&xe->drm,
+				"Initial plane programming missing DM bit\n");
+			return NULL;
+		}
+
+		phys_base = pte & ~(page_size - 1);
+		flags |= XE_BO_CREATE_VRAM0_BIT;
+
+		/*
+		 * We don't currently expect this to ever be placed in the
+		 * stolen portion.
+		 */
+		if (phys_base >= tile0->mem.vram.usable_size) {
+			drm_err(&xe->drm,
+				"Initial plane programming using invalid range, phys_base=%pa\n",
+				&phys_base);
+			return NULL;
+		}
+
+		drm_dbg(&xe->drm,
+			"Using phys_base=%pa, based on initial plane programming\n",
+			&phys_base);
+	} else {
+		struct ttm_resource_manager *stolen = ttm_manager_type(&xe->ttm, XE_PL_STOLEN);
+
+		if (!stolen)
+			return NULL;
+		phys_base = base;
+		flags |= XE_BO_CREATE_STOLEN_BIT;
+
+		/*
+		 * 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 (IS_ENABLED(CONFIG_FRAMEBUFFER_CONSOLE) &&
+		    plane_config->size * 2 >> PAGE_SHIFT >= stolen->size)
+			return NULL;
+	}
+
+	size = round_up(plane_config->base + plane_config->size,
+			page_size);
+	size -= base;
+
+	bo = xe_bo_create_pin_map_at(xe, tile0, NULL, size, phys_base,
+				     ttm_bo_type_kernel, flags);
+	if (IS_ERR(bo)) {
+		drm_dbg(&xe->drm,
+			"Failed to create bo phys_base=%pa size %u with flags %x: %li\n",
+			&phys_base, size, flags, PTR_ERR(bo));
+		return NULL;
+	}
+
+	return bo;
+}
+
+static bool
+intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
+			      struct intel_initial_plane_config *plane_config)
+{
+	struct drm_device *dev = crtc->base.dev;
+	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;
+	struct xe_bo *bo;
+
+	switch (fb->modifier) {
+	case DRM_FORMAT_MOD_LINEAR:
+	case I915_FORMAT_MOD_X_TILED:
+	case I915_FORMAT_MOD_Y_TILED:
+	case I915_FORMAT_MOD_4_TILED:
+		break;
+	default:
+		drm_dbg(&dev_priv->drm,
+			"Unsupported modifier for initial FB: 0x%llx\n",
+			fb->modifier);
+		return false;
+	}
+
+	mode_cmd.pixel_format = fb->format->format;
+	mode_cmd.width = fb->width;
+	mode_cmd.height = fb->height;
+	mode_cmd.pitches[0] = fb->pitches[0];
+	mode_cmd.modifier[0] = fb->modifier;
+	mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
+
+	bo = initial_plane_bo(dev_priv, plane_config);
+	if (!bo)
+		return false;
+
+	if (intel_framebuffer_init(to_intel_framebuffer(fb),
+				   bo, &mode_cmd)) {
+		drm_dbg_kms(&dev_priv->drm, "intel fb init failed\n");
+		goto err_bo;
+	}
+	/* Reference handed over to fb */
+	xe_bo_put(bo);
+
+	return true;
+
+err_bo:
+	xe_bo_unpin_map_no_vm(bo);
+	return false;
+}
+
+static void
+intel_find_initial_plane_obj(struct intel_crtc *crtc,
+			     struct intel_initial_plane_config *plane_config)
+{
+	struct drm_device *dev = crtc->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_plane *plane =
+		to_intel_plane(crtc->base.primary);
+	struct intel_plane_state *plane_state =
+		to_intel_plane_state(plane->base.state);
+	struct intel_crtc_state *crtc_state =
+		to_intel_crtc_state(crtc->base.state);
+	struct drm_framebuffer *fb;
+	struct i915_vma *vma;
+
+	/*
+	 * TODO:
+	 *   Disable planes if get_initial_plane_config() failed.
+	 *   Make sure things work if the surface base is not page aligned.
+	 */
+	if (!plane_config->fb)
+		return;
+
+	if (intel_alloc_initial_plane_obj(crtc, plane_config))
+		fb = &plane_config->fb->base;
+	else if (!intel_reuse_initial_plane_obj(dev_priv, plane_config, &fb))
+		goto nofb;
+
+	plane_state->uapi.rotation = plane_config->rotation;
+	intel_fb_fill_view(to_intel_framebuffer(fb),
+			   plane_state->uapi.rotation, &plane_state->view);
+
+	vma = intel_pin_and_fence_fb_obj(fb, false, &plane_state->view.gtt,
+					 false, &plane_state->flags);
+	if (IS_ERR(vma))
+		goto nofb;
+
+	plane_state->ggtt_vma = vma;
+	plane_state->uapi.src_x = 0;
+	plane_state->uapi.src_y = 0;
+	plane_state->uapi.src_w = fb->width << 16;
+	plane_state->uapi.src_h = fb->height << 16;
+
+	plane_state->uapi.crtc_x = 0;
+	plane_state->uapi.crtc_y = 0;
+	plane_state->uapi.crtc_w = fb->width;
+	plane_state->uapi.crtc_h = fb->height;
+
+	plane_state->uapi.fb = fb;
+	drm_framebuffer_get(fb);
+
+	plane_state->uapi.crtc = &crtc->base;
+	intel_plane_copy_uapi_to_hw_state(plane_state, plane_state, crtc);
+
+	atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)->bits);
+
+	plane_config->vma = vma;
+
+	/*
+	 * Flip to the newly created mapping ASAP, so we can re-use the
+	 * first part of GGTT for WOPCM, prevent flickering, and prevent
+	 * the lookup of sysmem scratch pages.
+	 */
+	plane->check_plane(crtc_state, plane_state);
+	plane->async_flip(plane, crtc_state, plane_state, true);
+	return;
+
+nofb:
+	/*
+	 * We've failed to reconstruct the BIOS FB.  Current display state
+	 * indicates that the primary plane is visible, but has a NULL FB,
+	 * which will lead to problems later if we don't fix it up.  The
+	 * simplest solution is to just disable the primary plane now and
+	 * pretend the BIOS never had it enabled.
+	 */
+	intel_plane_disable_noatomic(crtc, plane);
+}
+
+static void plane_config_fini(struct intel_initial_plane_config *plane_config)
+{
+	if (plane_config->fb) {
+		struct drm_framebuffer *fb = &plane_config->fb->base;
+
+		/* We may only have the stub and not a full framebuffer */
+		if (drm_framebuffer_read_refcount(fb))
+			drm_framebuffer_put(fb);
+		else
+			kfree(fb);
+	}
+}
+
+void intel_crtc_initial_plane_config(struct intel_crtc *crtc)
+{
+	struct xe_device *xe = to_xe_device(crtc->base.dev);
+	struct intel_initial_plane_config plane_config = {};
+
+	/*
+	 * Note that reserving the BIOS fb up front prevents us
+	 * from stuffing other stolen allocations like the ring
+	 * on top.  This prevents some ugliness at boot time, and
+	 * can even allow for smooth boot transitions if the BIOS
+	 * fb is large enough for the active pipe configuration.
+	 */
+	xe->display.funcs.display->get_initial_plane_config(crtc, &plane_config);
+
+	/*
+	 * If the fb is shared between multiple heads, we'll
+	 * just get the first one.
+	 */
+	intel_find_initial_plane_obj(crtc, &plane_config);
+
+	plane_config_fini(&plane_config);
+}