1 files changed, 567 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
new file mode 100644
index 000000000000..9cd03e2adeb2
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -0,0 +1,567 @@
+/*
+ * Copyright © 2007 David Airlie
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *     David Airlie
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/vga_switcheroo.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_print.h>
+
+#include "i915_vma.h"
+#include "intel_bo.h"
+#include "intel_display_core.h"
+#include "intel_display_rpm.h"
+#include "intel_display_types.h"
+#include "intel_fb.h"
+#include "intel_fb_pin.h"
+#include "intel_fbdev.h"
+#include "intel_fbdev_fb.h"
+#include "intel_frontbuffer.h"
+
+struct intel_fbdev {
+	struct intel_framebuffer *fb;
+	struct i915_vma *vma;
+	unsigned long vma_flags;
+};
+
+static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
+{
+	struct intel_display *display = to_intel_display(fb_helper->client.dev);
+
+	return display->fbdev.fbdev;
+}
+
+static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
+{
+	return ifbdev->fb->frontbuffer;
+}
+
+static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev)
+{
+	intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU);
+}
+
+FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(intel_fbdev,
+				  drm_fb_helper_damage_range,
+				  drm_fb_helper_damage_area)
+
+static int intel_fbdev_set_par(struct fb_info *info)
+{
+	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	int ret;
+
+	ret = drm_fb_helper_set_par(info);
+	if (ret == 0)
+		intel_fbdev_invalidate(ifbdev);
+
+	return ret;
+}
+
+static int intel_fbdev_blank(int blank, struct fb_info *info)
+{
+	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	int ret;
+
+	ret = drm_fb_helper_blank(blank, info);
+	if (ret == 0)
+		intel_fbdev_invalidate(ifbdev);
+
+	return ret;
+}
+
+static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
+				   struct fb_info *info)
+{
+	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	int ret;
+
+	ret = drm_fb_helper_pan_display(var, info);
+	if (ret == 0)
+		intel_fbdev_invalidate(ifbdev);
+
+	return ret;
+}
+
+static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_gem_object *obj = drm_gem_fb_get_obj(fb_helper->fb, 0);
+
+	return intel_bo_fb_mmap(obj, vma);
+}
+
+static void intel_fbdev_fb_destroy(struct fb_info *info)
+{
+	struct drm_fb_helper *fb_helper = info->par;
+	struct intel_fbdev *ifbdev = to_intel_fbdev(fb_helper);
+
+	drm_fb_helper_fini(fb_helper);
+
+	/*
+	 * We rely on the object-free to release the VMA pinning for
+	 * the info->screen_base mmaping. Leaking the VMA is simpler than
+	 * trying to rectify all the possible error paths leading here.
+	 */
+	intel_fb_unpin_vma(ifbdev->vma, ifbdev->vma_flags);
+	drm_framebuffer_remove(fb_helper->fb);
+
+	drm_client_release(&fb_helper->client);
+}
+
+__diag_push();
+__diag_ignore_all("-Woverride-init", "Allow field initialization overrides for fb ops");
+
+static const struct fb_ops intelfb_ops = {
+	.owner = THIS_MODULE,
+	__FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
+	DRM_FB_HELPER_DEFAULT_OPS,
+	.fb_set_par = intel_fbdev_set_par,
+	.fb_blank = intel_fbdev_blank,
+	.fb_pan_display = intel_fbdev_pan_display,
+	__FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev),
+	.fb_mmap = intel_fbdev_mmap,
+	.fb_destroy = intel_fbdev_fb_destroy,
+};
+
+__diag_pop();
+
+static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
+{
+	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
+		return 0;
+
+	if (helper->fb->funcs->dirty)
+		return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
+
+	return 0;
+}
+
+static void intelfb_restore(struct drm_fb_helper *fb_helper)
+{
+	struct intel_fbdev *ifbdev = to_intel_fbdev(fb_helper);
+
+	intel_fbdev_invalidate(ifbdev);
+}
+
+static void intelfb_set_suspend(struct drm_fb_helper *fb_helper, bool suspend)
+{
+	struct fb_info *info = fb_helper->info;
+
+	/*
+	 * When resuming from hibernation, Linux restores the object's
+	 * content from swap if the buffer is backed by shmemfs. If the
+	 * object is stolen however, it will be full of whatever garbage
+	 * was left in there. Clear it to zero in this case.
+	 */
+	if (!suspend && !intel_bo_is_shmem(intel_fb_bo(fb_helper->fb)))
+		memset_io(info->screen_base, 0, info->screen_size);
+
+	fb_set_suspend(info, suspend);
+}
+
+static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
+	.fb_dirty = intelfb_dirty,
+	.fb_restore = intelfb_restore,
+	.fb_set_suspend = intelfb_set_suspend,
+};
+
+static void intel_fbdev_fill_mode_cmd(struct drm_fb_helper_surface_size *sizes,
+				      struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	/* we don't do packed 24bpp */
+	if (sizes->surface_bpp == 24)
+		sizes->surface_bpp = 32;
+
+	mode_cmd->flags = DRM_MODE_FB_MODIFIERS;
+	mode_cmd->width = sizes->surface_width;
+	mode_cmd->height = sizes->surface_height;
+
+	mode_cmd->pitches[0] = intel_fbdev_fb_pitch_align(mode_cmd->width * DIV_ROUND_UP(sizes->surface_bpp, 8));
+	mode_cmd->pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+							   sizes->surface_depth);
+	mode_cmd->modifier[0] = DRM_FORMAT_MOD_LINEAR;
+}
+
+static struct intel_framebuffer *
+__intel_fbdev_fb_alloc(struct intel_display *display,
+		       struct drm_fb_helper_surface_size *sizes)
+{
+	struct drm_mode_fb_cmd2 mode_cmd = {};
+	struct drm_framebuffer *fb;
+	struct drm_gem_object *obj;
+	int size;
+
+	intel_fbdev_fill_mode_cmd(sizes, &mode_cmd);
+
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+	size = PAGE_ALIGN(size);
+
+	obj = intel_fbdev_fb_bo_create(display->drm, size);
+	if (IS_ERR(obj)) {
+		fb = ERR_CAST(obj);
+		goto err;
+	}
+
+	fb = intel_framebuffer_create(obj,
+				      drm_get_format_info(display->drm,
+							  mode_cmd.pixel_format,
+							  mode_cmd.modifier[0]),
+				      &mode_cmd);
+	if (IS_ERR(fb)) {
+		intel_fbdev_fb_bo_destroy(obj);
+		goto err;
+	}
+
+	drm_gem_object_put(obj);
+
+	return to_intel_framebuffer(fb);
+
+err:
+	return ERR_CAST(fb);
+
+}
+
+int intel_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
+				   struct drm_fb_helper_surface_size *sizes)
+{
+	struct intel_display *display = to_intel_display(helper->dev);
+	struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
+	struct intel_framebuffer *fb = ifbdev->fb;
+	struct fb_info *info = helper->info;
+	struct ref_tracker *wakeref;
+	struct i915_vma *vma;
+	unsigned long flags = 0;
+	bool prealloc = false;
+	struct drm_gem_object *obj;
+	int ret;
+
+	ifbdev->fb = NULL;
+
+	if (fb &&
+	    (sizes->fb_width > fb->base.width ||
+	     sizes->fb_height > fb->base.height)) {
+		drm_dbg_kms(display->drm,
+			    "BIOS fb too small (%dx%d), we require (%dx%d),"
+			    " releasing it\n",
+			    fb->base.width, fb->base.height,
+			    sizes->fb_width, sizes->fb_height);
+		drm_framebuffer_put(&fb->base);
+		fb = NULL;
+	}
+	if (!fb || drm_WARN_ON(display->drm, !intel_fb_bo(&fb->base))) {
+		drm_dbg_kms(display->drm,
+			    "no BIOS fb, allocating a new one\n");
+
+		fb = __intel_fbdev_fb_alloc(display, sizes);
+		if (IS_ERR(fb))
+			return PTR_ERR(fb);
+	} else {
+		drm_dbg_kms(display->drm, "re-using BIOS fb\n");
+		prealloc = true;
+		sizes->fb_width = fb->base.width;
+		sizes->fb_height = fb->base.height;
+	}
+
+	wakeref = intel_display_rpm_get(display);
+
+	/* Pin the GGTT vma for our access via info->screen_base.
+	 * This also validates that any existing fb inherited from the
+	 * BIOS is suitable for own access.
+	 */
+	vma = intel_fb_pin_to_ggtt(&fb->base, &fb->normal_view.gtt,
+				   fb->min_alignment, 0,
+				   intel_fb_view_vtd_guard(&fb->base, &fb->normal_view,
+							   DRM_MODE_ROTATE_0),
+				   false, &flags);
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto out_unlock;
+	}
+
+	helper->funcs = &intel_fb_helper_funcs;
+	helper->fb = &fb->base;
+
+	info->fbops = &intelfb_ops;
+
+	obj = intel_fb_bo(&fb->base);
+
+	ret = intel_fbdev_fb_fill_info(display->drm, info, obj, vma);
+	if (ret)
+		goto out_unpin;
+
+	drm_fb_helper_fill_info(info, display->drm->fb_helper, sizes);
+
+	/* If the object is shmemfs backed, it will have given us zeroed pages.
+	 * If the object is stolen however, it will be full of whatever
+	 * garbage was left in there.
+	 */
+	if (!intel_bo_is_shmem(obj) && !prealloc)
+		memset_io(info->screen_base, 0, info->screen_size);
+
+	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
+
+	drm_dbg_kms(display->drm, "allocated %dx%d fb: 0x%08x\n",
+		    fb->base.width, fb->base.height,
+		    i915_ggtt_offset(vma));
+	ifbdev->fb = fb;
+	ifbdev->vma = vma;
+	ifbdev->vma_flags = flags;
+
+	intel_display_rpm_put(display, wakeref);
+
+	return 0;
+
+out_unpin:
+	intel_fb_unpin_vma(vma, flags);
+out_unlock:
+	intel_display_rpm_put(display, wakeref);
+
+	return ret;
+}
+
+/*
+ * Build an intel_fbdev struct using a BIOS allocated framebuffer, if possible.
+ * The core display code will have read out the current plane configuration,
+ * so we use that to figure out if there's an object for us to use as the
+ * fb, and if so, we re-use it for the fbdev configuration.
+ *
+ * Note we only support a single fb shared across pipes for boot (mostly for
+ * fbcon), so we just find the biggest and use that.
+ */
+static bool intel_fbdev_init_bios(struct intel_display *display,
+				  struct intel_fbdev *ifbdev)
+{
+	struct intel_framebuffer *fb = NULL;
+	struct intel_crtc *crtc;
+	unsigned int max_size = 0;
+
+	/* Find the largest fb */
+	for_each_intel_crtc(display->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);
+		struct drm_gem_object *obj = intel_fb_bo(plane_state->uapi.fb);
+
+		if (!crtc_state->uapi.active) {
+			drm_dbg_kms(display->drm,
+				    "[CRTC:%d:%s] not active, skipping\n",
+				    crtc->base.base.id, crtc->base.name);
+			continue;
+		}
+
+		if (!obj) {
+			drm_dbg_kms(display->drm,
+				    "[PLANE:%d:%s] no fb, skipping\n",
+				    plane->base.base.id, plane->base.name);
+			continue;
+		}
+
+		if (obj->size > max_size) {
+			drm_dbg_kms(display->drm,
+				    "found possible fb from [PLANE:%d:%s]\n",
+				    plane->base.base.id, plane->base.name);
+			fb = to_intel_framebuffer(plane_state->uapi.fb);
+			max_size = obj->size;
+		}
+	}
+
+	if (!fb) {
+		drm_dbg_kms(display->drm,
+			    "no active fbs found, not using BIOS config\n");
+		goto out;
+	}
+
+	/* Now make sure all the pipes will fit into it */
+	for_each_intel_crtc(display->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);
+		unsigned int cur_size;
+
+		if (!crtc_state->uapi.active) {
+			drm_dbg_kms(display->drm,
+				    "[CRTC:%d:%s] not active, skipping\n",
+				    crtc->base.base.id, crtc->base.name);
+			continue;
+		}
+
+		drm_dbg_kms(display->drm, "checking [PLANE:%d:%s] for BIOS fb\n",
+			    plane->base.base.id, plane->base.name);
+
+		/*
+		 * See if the plane fb we found above will fit on this
+		 * pipe.  Note we need to use the selected fb's pitch and bpp
+		 * rather than the current pipe's, since they differ.
+		 */
+		cur_size = crtc_state->uapi.adjusted_mode.crtc_hdisplay;
+		cur_size = cur_size * fb->base.format->cpp[0];
+		if (fb->base.pitches[0] < cur_size) {
+			drm_dbg_kms(display->drm,
+				    "fb not wide enough for [PLANE:%d:%s] (%d vs %d)\n",
+				    plane->base.base.id, plane->base.name,
+				    cur_size, fb->base.pitches[0]);
+			fb = NULL;
+			break;
+		}
+
+		cur_size = crtc_state->uapi.adjusted_mode.crtc_vdisplay;
+		cur_size = intel_fb_align_height(&fb->base, 0, cur_size);
+		cur_size *= fb->base.pitches[0];
+		drm_dbg_kms(display->drm,
+			    "[CRTC:%d:%s] area: %dx%d, bpp: %d, size: %d\n",
+			    crtc->base.base.id, crtc->base.name,
+			    crtc_state->uapi.adjusted_mode.crtc_hdisplay,
+			    crtc_state->uapi.adjusted_mode.crtc_vdisplay,
+			    fb->base.format->cpp[0] * 8,
+			    cur_size);
+
+		if (cur_size > max_size) {
+			drm_dbg_kms(display->drm,
+				    "fb not big enough for [PLANE:%d:%s] (%d vs %d)\n",
+				    plane->base.base.id, plane->base.name,
+				    cur_size, max_size);
+			fb = NULL;
+			break;
+		}
+
+		drm_dbg_kms(display->drm,
+			    "fb big enough [PLANE:%d:%s] (%d >= %d)\n",
+			    plane->base.base.id, plane->base.name,
+			    max_size, cur_size);
+	}
+
+	if (!fb) {
+		drm_dbg_kms(display->drm,
+			    "BIOS fb not suitable for all pipes, not using\n");
+		goto out;
+	}
+
+	ifbdev->fb = fb;
+
+	drm_framebuffer_get(&ifbdev->fb->base);
+
+	/* Final pass to check if any active pipes don't have fbs */
+	for_each_intel_crtc(display->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;
+
+		drm_WARN(display->drm, !plane_state->uapi.fb,
+			 "re-used BIOS config but lost an fb on [PLANE:%d:%s]\n",
+			 plane->base.base.id, plane->base.name);
+	}
+
+
+	drm_dbg_kms(display->drm, "using BIOS fb for initial console\n");
+	return true;
+
+out:
+
+	return false;
+}
+
+static unsigned int intel_fbdev_color_mode(const struct drm_format_info *info)
+{
+	unsigned int bpp;
+
+	if (!info->depth || info->num_planes != 1 || info->has_alpha || info->is_yuv)
+		return 0;
+
+	bpp = drm_format_info_bpp(info, 0);
+
+	switch (bpp) {
+	case 16:
+		return info->depth; // 15 or 16
+	default:
+		return bpp;
+	}
+}
+
+void intel_fbdev_setup(struct intel_display *display)
+{
+	struct intel_fbdev *ifbdev;
+	unsigned int preferred_bpp = 0;
+
+	if (!HAS_DISPLAY(display))
+		return;
+
+	ifbdev = drmm_kzalloc(display->drm, sizeof(*ifbdev), GFP_KERNEL);
+	if (!ifbdev)
+		return;
+
+	display->fbdev.fbdev = ifbdev;
+	if (intel_fbdev_init_bios(display, ifbdev))
+		preferred_bpp = intel_fbdev_color_mode(ifbdev->fb->base.format);
+	if (!preferred_bpp)
+		preferred_bpp = 32;
+
+	drm_client_setup_with_color_mode(display->drm, preferred_bpp);
+}
+
+struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
+{
+	if (!fbdev)
+		return NULL;
+
+	return fbdev->fb;
+}
+
+struct i915_vma *intel_fbdev_vma_pointer(struct intel_fbdev *fbdev)
+{
+	return fbdev ? fbdev->vma : NULL;
+}
+
+void intel_fbdev_get_map(struct intel_fbdev *fbdev, struct iosys_map *map)
+{
+	intel_fb_get_map(fbdev->vma, map);
+}