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![Thomas Zimmermann](/assets/img/avatar_default.png)
Remove include statements for <drm/drm_fb_helper.h> where it is not required (i.e., most of them). In a few places include other header files that are required by the source code. v3: * fix amdgpu include statements * fix rockchip include statements Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221103151446.2638-23-tzimmermann@suse.de
610 lines
18 KiB
C
610 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* drm gem framebuffer helper functions
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*
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* Copyright (C) 2017 Noralf Trønnes
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <drm/drm_damage_helper.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_modeset_helper.h>
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#include "drm_internal.h"
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MODULE_IMPORT_NS(DMA_BUF);
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#define AFBC_HEADER_SIZE 16
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#define AFBC_TH_LAYOUT_ALIGNMENT 8
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#define AFBC_HDR_ALIGN 64
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#define AFBC_SUPERBLOCK_PIXELS 256
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#define AFBC_SUPERBLOCK_ALIGNMENT 128
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#define AFBC_TH_BODY_START_ALIGNMENT 4096
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/**
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* DOC: overview
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*
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* This library provides helpers for drivers that don't subclass
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* &drm_framebuffer and use &drm_gem_object for their backing storage.
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*
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* Drivers without additional needs to validate framebuffers can simply use
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* drm_gem_fb_create() and everything is wired up automatically. Other drivers
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* can use all parts independently.
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*/
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/**
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* drm_gem_fb_get_obj() - Get GEM object backing the framebuffer
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* @fb: Framebuffer
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* @plane: Plane index
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*
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* No additional reference is taken beyond the one that the &drm_frambuffer
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* already holds.
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*
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* Returns:
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* Pointer to &drm_gem_object for the given framebuffer and plane index or NULL
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* if it does not exist.
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*/
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struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
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unsigned int plane)
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{
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struct drm_device *dev = fb->dev;
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if (drm_WARN_ON_ONCE(dev, plane >= ARRAY_SIZE(fb->obj)))
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return NULL;
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else if (drm_WARN_ON_ONCE(dev, !fb->obj[plane]))
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return NULL;
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return fb->obj[plane];
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}
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EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
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static int
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drm_gem_fb_init(struct drm_device *dev,
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struct drm_framebuffer *fb,
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const struct drm_mode_fb_cmd2 *mode_cmd,
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struct drm_gem_object **obj, unsigned int num_planes,
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const struct drm_framebuffer_funcs *funcs)
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{
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unsigned int i;
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int ret;
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drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
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for (i = 0; i < num_planes; i++)
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fb->obj[i] = obj[i];
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ret = drm_framebuffer_init(dev, fb, funcs);
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if (ret)
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drm_err(dev, "Failed to init framebuffer: %d\n", ret);
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return ret;
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}
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/**
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* drm_gem_fb_destroy - Free GEM backed framebuffer
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* @fb: Framebuffer
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*
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* Frees a GEM backed framebuffer with its backing buffer(s) and the structure
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* itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
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* callback.
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*/
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void drm_gem_fb_destroy(struct drm_framebuffer *fb)
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{
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unsigned int i;
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for (i = 0; i < fb->format->num_planes; i++)
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drm_gem_object_put(fb->obj[i]);
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drm_framebuffer_cleanup(fb);
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kfree(fb);
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}
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EXPORT_SYMBOL(drm_gem_fb_destroy);
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/**
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* drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
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* @fb: Framebuffer
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* @file: DRM file to register the handle for
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* @handle: Pointer to return the created handle
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*
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* This function creates a handle for the GEM object backing the framebuffer.
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* Drivers can use this as their &drm_framebuffer_funcs->create_handle
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* callback. The GETFB IOCTL calls into this callback.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
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unsigned int *handle)
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{
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return drm_gem_handle_create(file, fb->obj[0], handle);
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}
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EXPORT_SYMBOL(drm_gem_fb_create_handle);
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/**
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* drm_gem_fb_init_with_funcs() - Helper function for implementing
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* &drm_mode_config_funcs.fb_create
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* callback in cases when the driver
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* allocates a subclass of
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* struct drm_framebuffer
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* @dev: DRM device
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* @fb: framebuffer object
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* @file: DRM file that holds the GEM handle(s) backing the framebuffer
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* @mode_cmd: Metadata from the userspace framebuffer creation request
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* @funcs: vtable to be used for the new framebuffer object
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*
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* This function can be used to set &drm_framebuffer_funcs for drivers that need
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* custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
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* change &drm_framebuffer_funcs. The function does buffer size validation.
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* The buffer size validation is for a general case, though, so users should
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* pay attention to the checks being appropriate for them or, at least,
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* non-conflicting.
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*
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* Returns:
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* Zero or a negative error code.
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*/
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int drm_gem_fb_init_with_funcs(struct drm_device *dev,
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struct drm_framebuffer *fb,
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struct drm_file *file,
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const struct drm_mode_fb_cmd2 *mode_cmd,
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const struct drm_framebuffer_funcs *funcs)
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{
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const struct drm_format_info *info;
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struct drm_gem_object *objs[DRM_FORMAT_MAX_PLANES];
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unsigned int i;
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int ret;
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info = drm_get_format_info(dev, mode_cmd);
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if (!info) {
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drm_dbg_kms(dev, "Failed to get FB format info\n");
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return -EINVAL;
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}
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for (i = 0; i < info->num_planes; i++) {
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unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
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unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
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unsigned int min_size;
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objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
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if (!objs[i]) {
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drm_dbg_kms(dev, "Failed to lookup GEM object\n");
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ret = -ENOENT;
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goto err_gem_object_put;
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}
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min_size = (height - 1) * mode_cmd->pitches[i]
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+ drm_format_info_min_pitch(info, i, width)
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+ mode_cmd->offsets[i];
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if (objs[i]->size < min_size) {
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drm_dbg_kms(dev,
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"GEM object size (%zu) smaller than minimum size (%u) for plane %d\n",
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objs[i]->size, min_size, i);
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drm_gem_object_put(objs[i]);
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ret = -EINVAL;
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goto err_gem_object_put;
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}
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}
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ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs);
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if (ret)
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goto err_gem_object_put;
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return 0;
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err_gem_object_put:
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while (i > 0) {
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--i;
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drm_gem_object_put(objs[i]);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs);
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/**
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* drm_gem_fb_create_with_funcs() - Helper function for the
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* &drm_mode_config_funcs.fb_create
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* callback
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* @dev: DRM device
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* @file: DRM file that holds the GEM handle(s) backing the framebuffer
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* @mode_cmd: Metadata from the userspace framebuffer creation request
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* @funcs: vtable to be used for the new framebuffer object
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*
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* This function can be used to set &drm_framebuffer_funcs for drivers that need
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* custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to
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* change &drm_framebuffer_funcs. The function does buffer size validation.
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*
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* Returns:
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* Pointer to a &drm_framebuffer on success or an error pointer on failure.
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*/
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struct drm_framebuffer *
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drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
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const struct drm_mode_fb_cmd2 *mode_cmd,
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const struct drm_framebuffer_funcs *funcs)
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{
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struct drm_framebuffer *fb;
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int ret;
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fb = kzalloc(sizeof(*fb), GFP_KERNEL);
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if (!fb)
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return ERR_PTR(-ENOMEM);
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ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs);
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if (ret) {
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kfree(fb);
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return ERR_PTR(ret);
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}
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return fb;
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}
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EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
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static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
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.destroy = drm_gem_fb_destroy,
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.create_handle = drm_gem_fb_create_handle,
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};
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/**
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* drm_gem_fb_create() - Helper function for the
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* &drm_mode_config_funcs.fb_create callback
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* @dev: DRM device
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* @file: DRM file that holds the GEM handle(s) backing the framebuffer
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* @mode_cmd: Metadata from the userspace framebuffer creation request
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*
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* This function creates a new framebuffer object described by
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* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
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* backing the framebuffer.
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*
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* If your hardware has special alignment or pitch requirements these should be
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* checked before calling this function. The function does buffer size
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* validation. Use drm_gem_fb_create_with_dirty() if you need framebuffer
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* flushing.
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*
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* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
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* The ADDFB2 IOCTL calls into this callback.
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*
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* Returns:
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* Pointer to a &drm_framebuffer on success or an error pointer on failure.
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*/
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struct drm_framebuffer *
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drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
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const struct drm_mode_fb_cmd2 *mode_cmd)
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{
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return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
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&drm_gem_fb_funcs);
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}
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EXPORT_SYMBOL_GPL(drm_gem_fb_create);
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static const struct drm_framebuffer_funcs drm_gem_fb_funcs_dirtyfb = {
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.destroy = drm_gem_fb_destroy,
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.create_handle = drm_gem_fb_create_handle,
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.dirty = drm_atomic_helper_dirtyfb,
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};
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/**
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* drm_gem_fb_create_with_dirty() - Helper function for the
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* &drm_mode_config_funcs.fb_create callback
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* @dev: DRM device
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* @file: DRM file that holds the GEM handle(s) backing the framebuffer
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* @mode_cmd: Metadata from the userspace framebuffer creation request
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*
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* This function creates a new framebuffer object described by
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* &drm_mode_fb_cmd2. This description includes handles for the buffer(s)
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* backing the framebuffer. drm_atomic_helper_dirtyfb() is used for the dirty
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* callback giving framebuffer flushing through the atomic machinery. Use
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* drm_gem_fb_create() if you don't need the dirty callback.
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* The function does buffer size validation.
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*
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* Drivers should also call drm_plane_enable_fb_damage_clips() on all planes
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* to enable userspace to use damage clips also with the ATOMIC IOCTL.
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*
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* Drivers can use this as their &drm_mode_config_funcs.fb_create callback.
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* The ADDFB2 IOCTL calls into this callback.
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*
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* Returns:
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* Pointer to a &drm_framebuffer on success or an error pointer on failure.
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*/
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struct drm_framebuffer *
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drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
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const struct drm_mode_fb_cmd2 *mode_cmd)
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{
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return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
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&drm_gem_fb_funcs_dirtyfb);
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}
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EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
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/**
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* drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
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* @fb: the framebuffer
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* @map: returns the mapping's address for each BO
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* @data: returns the data address for each BO, can be NULL
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*
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* This function maps all buffer objects of the given framebuffer into
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* kernel address space and stores them in struct iosys_map. If the
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* mapping operation fails for one of the BOs, the function unmaps the
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* already established mappings automatically.
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*
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* Callers that want to access a BO's stored data should pass @data.
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* The argument returns the addresses of the data stored in each BO. This
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* is different from @map if the framebuffer's offsets field is non-zero.
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*
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* Both, @map and @data, must each refer to arrays with at least
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* fb->format->num_planes elements.
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*
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* See drm_gem_fb_vunmap() for unmapping.
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*
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* Returns:
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* 0 on success, or a negative errno code otherwise.
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*/
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int drm_gem_fb_vmap(struct drm_framebuffer *fb, struct iosys_map *map,
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struct iosys_map *data)
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{
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struct drm_gem_object *obj;
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unsigned int i;
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int ret;
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for (i = 0; i < fb->format->num_planes; ++i) {
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obj = drm_gem_fb_get_obj(fb, i);
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if (!obj) {
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ret = -EINVAL;
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goto err_drm_gem_vunmap;
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}
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ret = drm_gem_vmap_unlocked(obj, &map[i]);
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if (ret)
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goto err_drm_gem_vunmap;
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}
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if (data) {
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for (i = 0; i < fb->format->num_planes; ++i) {
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memcpy(&data[i], &map[i], sizeof(data[i]));
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if (iosys_map_is_null(&data[i]))
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continue;
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iosys_map_incr(&data[i], fb->offsets[i]);
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}
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}
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return 0;
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err_drm_gem_vunmap:
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while (i) {
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--i;
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obj = drm_gem_fb_get_obj(fb, i);
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if (!obj)
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continue;
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drm_gem_vunmap_unlocked(obj, &map[i]);
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}
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_fb_vmap);
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/**
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* drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
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* @fb: the framebuffer
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* @map: mapping addresses as returned by drm_gem_fb_vmap()
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*
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* This function unmaps all buffer objects of the given framebuffer.
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*
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* See drm_gem_fb_vmap() for more information.
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*/
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void drm_gem_fb_vunmap(struct drm_framebuffer *fb, struct iosys_map *map)
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{
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unsigned int i = fb->format->num_planes;
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struct drm_gem_object *obj;
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while (i) {
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--i;
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obj = drm_gem_fb_get_obj(fb, i);
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if (!obj)
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continue;
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if (iosys_map_is_null(&map[i]))
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continue;
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drm_gem_vunmap_unlocked(obj, &map[i]);
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}
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}
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EXPORT_SYMBOL(drm_gem_fb_vunmap);
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static void __drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir,
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unsigned int num_planes)
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{
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struct dma_buf_attachment *import_attach;
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struct drm_gem_object *obj;
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int ret;
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while (num_planes) {
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--num_planes;
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obj = drm_gem_fb_get_obj(fb, num_planes);
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if (!obj)
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continue;
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import_attach = obj->import_attach;
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if (!import_attach)
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continue;
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ret = dma_buf_end_cpu_access(import_attach->dmabuf, dir);
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if (ret)
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drm_err(fb->dev, "dma_buf_end_cpu_access(%u, %d) failed: %d\n",
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ret, num_planes, dir);
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}
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}
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/**
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* drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
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* @fb: the framebuffer
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* @dir: access mode
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*
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* Prepares a framebuffer's GEM buffer objects for CPU access. This function
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* must be called before accessing the BO data within the kernel. For imported
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* BOs, the function calls dma_buf_begin_cpu_access().
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*
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* See drm_gem_fb_end_cpu_access() for signalling the end of CPU access.
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*
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* Returns:
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* 0 on success, or a negative errno code otherwise.
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*/
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int drm_gem_fb_begin_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
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{
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struct dma_buf_attachment *import_attach;
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struct drm_gem_object *obj;
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unsigned int i;
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int ret;
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for (i = 0; i < fb->format->num_planes; ++i) {
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obj = drm_gem_fb_get_obj(fb, i);
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if (!obj) {
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ret = -EINVAL;
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goto err___drm_gem_fb_end_cpu_access;
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}
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import_attach = obj->import_attach;
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if (!import_attach)
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continue;
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ret = dma_buf_begin_cpu_access(import_attach->dmabuf, dir);
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if (ret)
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goto err___drm_gem_fb_end_cpu_access;
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}
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return 0;
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err___drm_gem_fb_end_cpu_access:
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__drm_gem_fb_end_cpu_access(fb, dir, i);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_fb_begin_cpu_access);
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/**
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* drm_gem_fb_end_cpu_access - signals end of CPU access to GEM buffer objects
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* @fb: the framebuffer
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* @dir: access mode
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*
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* Signals the end of CPU access to the given framebuffer's GEM buffer objects. This
|
|
* function must be paired with a corresponding call to drm_gem_fb_begin_cpu_access().
|
|
* For imported BOs, the function calls dma_buf_end_cpu_access().
|
|
*
|
|
* See also drm_gem_fb_begin_cpu_access().
|
|
*/
|
|
void drm_gem_fb_end_cpu_access(struct drm_framebuffer *fb, enum dma_data_direction dir)
|
|
{
|
|
__drm_gem_fb_end_cpu_access(fb, dir, fb->format->num_planes);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_fb_end_cpu_access);
|
|
|
|
// TODO Drop this function and replace by drm_format_info_bpp() once all
|
|
// DRM_FORMAT_* provide proper block info in drivers/gpu/drm/drm_fourcc.c
|
|
static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev,
|
|
const struct drm_mode_fb_cmd2 *mode_cmd)
|
|
{
|
|
const struct drm_format_info *info;
|
|
|
|
info = drm_get_format_info(dev, mode_cmd);
|
|
|
|
switch (info->format) {
|
|
case DRM_FORMAT_YUV420_8BIT:
|
|
return 12;
|
|
case DRM_FORMAT_YUV420_10BIT:
|
|
return 15;
|
|
case DRM_FORMAT_VUY101010:
|
|
return 30;
|
|
default:
|
|
return drm_format_info_bpp(info, 0);
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
__u32 n_blocks, w_alignment, h_alignment, hdr_alignment;
|
|
/* remove bpp when all users properly encode cpp in drm_format_info */
|
|
__u32 bpp;
|
|
|
|
switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
|
|
case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
|
|
afbc_fb->block_width = 16;
|
|
afbc_fb->block_height = 16;
|
|
break;
|
|
case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
|
|
afbc_fb->block_width = 32;
|
|
afbc_fb->block_height = 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_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
|
|
mode_cmd->modifier[0]
|
|
& AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
|
|
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];
|
|
|
|
bpp = drm_gem_afbc_get_bpp(dev, mode_cmd);
|
|
if (!bpp) {
|
|
drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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(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().
|
|
* It is caller's responsibility to put afbc_fb->base.obj objects in case
|
|
* the call is unsuccessful.
|
|
*
|
|
* 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;
|
|
|
|
objs = afbc_fb->base.obj;
|
|
info = drm_get_format_info(dev, mode_cmd);
|
|
if (!info)
|
|
return -EINVAL;
|
|
|
|
ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (objs[0]->size < afbc_fb->afbc_size)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init);
|