1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_fb.c b/drivers/gpu/drm/msm/msm_fb.c
new file mode 100644
index 000000000..e3f61c39d
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_fb.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_file.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "msm_drv.h"
+#include "msm_kms.h"
+#include "msm_gem.h"
+
+struct msm_framebuffer {
+	struct drm_framebuffer base;
+	const struct msm_format *format;
+
+	/* Count of # of attached planes which need dirtyfb: */
+	refcount_t dirtyfb;
+
+	/* Framebuffer per-plane address, if pinned, else zero: */
+	uint64_t iova[DRM_FORMAT_MAX_PLANES];
+	atomic_t prepare_count;
+};
+#define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
+
+static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
+		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
+
+static int msm_framebuffer_dirtyfb(struct drm_framebuffer *fb,
+				   struct drm_file *file_priv, unsigned int flags,
+				   unsigned int color, struct drm_clip_rect *clips,
+				   unsigned int num_clips)
+{
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+
+	/* If this fb is not used on any display requiring pixel data to be
+	 * flushed, then skip dirtyfb
+	 */
+	if (refcount_read(&msm_fb->dirtyfb) == 1)
+		return 0;
+
+	return drm_atomic_helper_dirtyfb(fb, file_priv, flags, color,
+					 clips, num_clips);
+}
+
+static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
+	.create_handle = drm_gem_fb_create_handle,
+	.destroy = drm_gem_fb_destroy,
+	.dirty = msm_framebuffer_dirtyfb,
+};
+
+#ifdef CONFIG_DEBUG_FS
+void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
+{
+	struct msm_gem_stats stats = {};
+	int i, n = fb->format->num_planes;
+
+	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
+			fb->width, fb->height, (char *)&fb->format->format,
+			drm_framebuffer_read_refcount(fb), fb->base.id);
+
+	for (i = 0; i < n; i++) {
+		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
+				i, fb->offsets[i], fb->pitches[i]);
+		msm_gem_describe(fb->obj[i], m, &stats);
+	}
+}
+#endif
+
+/* prepare/pin all the fb's bo's for scanout.
+ */
+int msm_framebuffer_prepare(struct drm_framebuffer *fb,
+		struct msm_gem_address_space *aspace,
+		bool needs_dirtyfb)
+{
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+	int ret, i, n = fb->format->num_planes;
+
+	if (needs_dirtyfb)
+		refcount_inc(&msm_fb->dirtyfb);
+
+	atomic_inc(&msm_fb->prepare_count);
+
+	for (i = 0; i < n; i++) {
+		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &msm_fb->iova[i]);
+		drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)",
+			      fb->base.id, i, msm_fb->iova[i], ret);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
+		struct msm_gem_address_space *aspace,
+		bool needed_dirtyfb)
+{
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+	int i, n = fb->format->num_planes;
+
+	if (needed_dirtyfb)
+		refcount_dec(&msm_fb->dirtyfb);
+
+	for (i = 0; i < n; i++)
+		msm_gem_unpin_iova(fb->obj[i], aspace);
+
+	if (!atomic_dec_return(&msm_fb->prepare_count))
+		memset(msm_fb->iova, 0, sizeof(msm_fb->iova));
+}
+
+uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
+		struct msm_gem_address_space *aspace, int plane)
+{
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+	return msm_fb->iova[plane] + fb->offsets[plane];
+}
+
+struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
+{
+	return drm_gem_fb_get_obj(fb, plane);
+}
+
+const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
+{
+	struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
+	return msm_fb->format;
+}
+
+struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
+		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
+	struct drm_gem_object *bos[4] = {0};
+	struct drm_framebuffer *fb;
+	int ret, i, n = info->num_planes;
+
+	for (i = 0; i < n; i++) {
+		bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
+		if (!bos[i]) {
+			ret = -ENXIO;
+			goto out_unref;
+		}
+	}
+
+	fb = msm_framebuffer_init(dev, mode_cmd, bos);
+	if (IS_ERR(fb)) {
+		ret = PTR_ERR(fb);
+		goto out_unref;
+	}
+
+	return fb;
+
+out_unref:
+	for (i = 0; i < n; i++)
+		drm_gem_object_put(bos[i]);
+	return ERR_PTR(ret);
+}
+
+static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
+		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
+{
+	const struct drm_format_info *info = drm_get_format_info(dev,
+								 mode_cmd);
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_kms *kms = priv->kms;
+	struct msm_framebuffer *msm_fb = NULL;
+	struct drm_framebuffer *fb;
+	const struct msm_format *format;
+	int ret, i, n;
+
+	drm_dbg_state(dev, "create framebuffer: mode_cmd=%p (%dx%d@%4.4s)",
+			mode_cmd, mode_cmd->width, mode_cmd->height,
+			(char *)&mode_cmd->pixel_format);
+
+	n = info->num_planes;
+	format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
+			mode_cmd->modifier[0]);
+	if (!format) {
+		DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
+				(char *)&mode_cmd->pixel_format);
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
+	if (!msm_fb) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	fb = &msm_fb->base;
+
+	msm_fb->format = format;
+
+	if (n > ARRAY_SIZE(fb->obj)) {
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	for (i = 0; i < n; i++) {
+		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
+		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
+		unsigned int min_size;
+
+		min_size = (height - 1) * mode_cmd->pitches[i]
+			 + width * info->cpp[i]
+			 + mode_cmd->offsets[i];
+
+		if (bos[i]->size < min_size) {
+			ret = -EINVAL;
+			goto fail;
+		}
+
+		msm_fb->base.obj[i] = bos[i];
+	}
+
+	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
+
+	ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
+	if (ret) {
+		DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
+		goto fail;
+	}
+
+	refcount_set(&msm_fb->dirtyfb, 1);
+
+	drm_dbg_state(dev, "create: FB ID: %d (%p)", fb->base.id, fb);
+
+	return fb;
+
+fail:
+	kfree(msm_fb);
+
+	return ERR_PTR(ret);
+}
+
+struct drm_framebuffer *
+msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
+{
+	struct drm_mode_fb_cmd2 mode_cmd = {
+		.pixel_format = format,
+		.width = w,
+		.height = h,
+		.pitches = { p },
+	};
+	struct drm_gem_object *bo;
+	struct drm_framebuffer *fb;
+	int size;
+
+	/* allocate backing bo */
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
+	bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
+	if (IS_ERR(bo)) {
+		dev_warn(dev->dev, "could not allocate stolen bo\n");
+		/* try regular bo: */
+		bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
+	}
+	if (IS_ERR(bo)) {
+		DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
+		return ERR_CAST(bo);
+	}
+
+	msm_gem_object_set_name(bo, "stolenfb");
+
+	fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
+	if (IS_ERR(fb)) {
+		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
+		/* note: if fb creation failed, we can't rely on fb destroy
+		 * to unref the bo:
+		 */
+		drm_gem_object_put(bo);
+		return ERR_CAST(fb);
+	}
+
+	return fb;
+}