The new struct contains afbc-specific data.
The new function can be used by drivers which support afbc to complete
the preparation of struct drm_afbc_framebuffer. It must be called after
allocating the said struct and calling drm_gem_fb_init_with_funcs().
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_gem_framebuffer_helper.c | 121 +++++++++++++++++++
include/drm/drm_framebuffer.h | 45 +++++++
include/drm/drm_gem_framebuffer_helper.h | 11 ++
3 files changed, 177 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
index 388a080cd2df..2a30f5b6829f 100644
--- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
+++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
@@ -21,6 +21,13 @@
#include <drm/drm_modeset_helper.h>
#include <drm/drm_simple_kms_helper.h>
+#define AFBC_HEADER_SIZE 16
+#define AFBC_TH_LAYOUT_ALIGNMENT 8
+#define AFBC_HDR_ALIGN 64
+#define AFBC_SUPERBLOCK_PIXELS 256
+#define AFBC_SUPERBLOCK_ALIGNMENT 128
+#define AFBC_TH_BODY_START_ALIGNMENT 4096
+
/**
* DOC: overview
*
@@ -302,6 +309,120 @@ drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
}
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
+/**
+ * drm_afbc_get_superblock_wh - extract afbc block width/height from modifier
+ * @modifier: the modifier to be looked at
+ * @w: address of a place to store the block width
+ * @h: address of a place to store the block height
+ *
+ * Returns: true if the modifier describes a supported block size
+ */
+bool drm_afbc_get_superblock_wh(u64 modifier, u32 *w, u32 *h)
+{
+ switch (modifier & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
+ case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
+ *w = 16;
+ *h = 16;
+ break;
+ case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
+ *w = 32;
+ *h = 8;
+ break;
+ /* no user exists yet - fall through */
+ case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4:
+ case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4:
+ default:
+ DRM_DEBUG_KMS("Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
+ modifier & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
+ return false;
+ }
+ return true;
+}
+EXPORT_SYMBOL_GPL(drm_afbc_get_superblock_wh);
+
+static int drm_gem_afbc_min_size(struct drm_device *dev,
+ const struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_afbc_framebuffer *afbc_fb)
+{
+ const struct drm_format_info *info;
+ u32 n_blocks, w_alignment, h_alignment, hdr_alignment;
+ u32 tmp_bpp; /* remove when all users properly encode cpp in drm_format_info */
+
+ if (!drm_afbc_get_superblock_wh(mode_cmd->modifier[0], &afbc_fb->block_width, &afbc_fb->block_height))
+ return -EINVAL;
+
+ /* tiled header afbc */
+ w_alignment = afbc_fb->block_width;
+ h_alignment = afbc_fb->block_height;
+ hdr_alignment = AFBC_HDR_ALIGN;
+ if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) {
+ w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
+ h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT;
+ hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT;
+ }
+
+ afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment);
+ afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment);
+ afbc_fb->offset = mode_cmd->offsets[0];
+
+ /* Change to always using info->cpp[0] when all users properly encode it */
+ info = drm_get_format_info(dev, mode_cmd);
+ tmp_bpp = info->cpp[0] ? info->cpp[0] * 8 : afbc_fb->bpp;
+
+ n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height) / AFBC_SUPERBLOCK_PIXELS;
+ afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment);
+ afbc_fb->afbc_size += n_blocks * ALIGN(tmp_bpp * AFBC_SUPERBLOCK_PIXELS / 8, AFBC_SUPERBLOCK_ALIGNMENT);
+
+ return 0;
+}
+
+/**
+ * drm_gem_fb_afbc_init() - Helper function for drivers using afbc to
+ * fill and validate all the afbc-specific
+ * struct drm_afbc_framebuffer members
+ *
+ * @dev: DRM device
+ * @afbc_fb: afbc-specific framebuffer
+ * @mode_cmd: Metadata from the userspace framebuffer creation request
+ * @afbc_fb: afbc framebuffer
+ *
+ * This function can be used by drivers which support afbc to complete
+ * the preparation of struct drm_afbc_framebuffer. It must be called after
+ * allocating the said struct and calling drm_gem_fb_init_with_funcs().
+ *
+ * Returns:
+ * Zero on success or a negative error value on failure.
+ */
+int drm_gem_fb_afbc_init(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_afbc_framebuffer *afbc_fb)
+{
+ const struct drm_format_info *info;
+ struct drm_gem_object **objs;
+ int ret = -EINVAL, i;
+
+ objs = afbc_fb->base.obj;
+ info = drm_get_format_info(dev, mode_cmd);
+ if (!info)
+ goto error;
+
+ ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb);
+ if (ret < 0)
+ goto error;
+
+ if (objs[0]->size < afbc_fb->afbc_size) {
+ ret = -EINVAL;
+ goto error;
+ }
+
+ return 0;
+
+error:
+ for (i = 0; i < info->num_planes; i++)
+ drm_gem_object_put_unlocked(objs[i]);
+
+ return ret;
+}
+
/**
* drm_gem_fb_prepare_fb() - Prepare a GEM backed framebuffer
* @plane: Plane
diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h
index c0e0256e3e98..e9f1b0e2968d 100644
--- a/include/drm/drm_framebuffer.h
+++ b/include/drm/drm_framebuffer.h
@@ -297,4 +297,49 @@ int drm_framebuffer_plane_width(int width,
int drm_framebuffer_plane_height(int height,
const struct drm_framebuffer *fb, int plane);
+/**
+ * struct drm_afbc_framebuffer - a special afbc frame buffer object
+ *
+ * A derived class of struct drm_framebuffer, dedicated for afbc use cases.
+ */
+struct drm_afbc_framebuffer {
+ /**
+ * @base: base framebuffer structure.
+ */
+ struct drm_framebuffer base;
+ /**
+ * @block_widht: width of a single afbc block
+ */
+ u32 block_width;
+ /**
+ * @block_widht: height of a single afbc block
+ */
+ u32 block_height;
+ /**
+ * @aligned_width: aligned frame buffer width
+ */
+ u32 aligned_width;
+ /**
+ * @aligned_height: aligned frame buffer height
+ */
+ u32 aligned_height;
+ /**
+ * @offset: offset of the first afbc header
+ */
+ u32 offset;
+ /**
+ * @afbc_size: minimum size of afbc buffer
+ */
+ u32 afbc_size;
+ /**
+ * @bpp: bpp value for this afbc buffer
+ * To be removed when users such as malidp
+ * properly store the cpp in drm_format_info.
+ * New users should not start using this field.
+ */
+ u32 bpp;
+};
+
+#define fb_to_afbc_fb(x) container_of(x, struct drm_afbc_framebuffer, base)
+
#endif
diff --git a/include/drm/drm_gem_framebuffer_helper.h b/include/drm/drm_gem_framebuffer_helper.h
index 3f61d9f832ee..c17bf0ebbe55 100644
--- a/include/drm/drm_gem_framebuffer_helper.h
+++ b/include/drm/drm_gem_framebuffer_helper.h
@@ -1,6 +1,7 @@
#ifndef __DRM_GEM_FB_HELPER_H__
#define __DRM_GEM_FB_HELPER_H__
+struct drm_afbc_framebuffer;
struct drm_device;
struct drm_fb_helper_surface_size;
struct drm_file;
@@ -12,6 +13,8 @@ struct drm_plane;
struct drm_plane_state;
struct drm_simple_display_pipe;
+#define AFBC_VENDOR_AND_TYPE_MASK GENMASK_ULL(63, 52)
+
struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
unsigned int plane);
void drm_gem_fb_destroy(struct drm_framebuffer *fb);
@@ -34,6 +37,14 @@ struct drm_framebuffer *
drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
const struct drm_mode_fb_cmd2 *mode_cmd);
+#define drm_is_afbc(modifier) \
+ (((modifier) & AFBC_VENDOR_AND_TYPE_MASK) == DRM_FORMAT_MOD_ARM_AFBC(0))
+
+bool drm_afbc_get_superblock_wh(u64 modifier, u32 *w, u32 *h);
+
+int drm_gem_fb_afbc_init(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_afbc_framebuffer *afbc_fb);
+
int drm_gem_fb_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state);
int drm_gem_fb_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
--
2.17.1
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