545 lines
16 KiB
C
545 lines
16 KiB
C
/*
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* drm kms/fb cma (contiguous memory allocator) helper functions
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*
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* Copyright (C) 2012 Analog Device Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Based on udl_fbdev.c
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* Copyright (C) 2012 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <linux/module.h>
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#define DEFAULT_FBDEFIO_DELAY_MS 50
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struct drm_fbdev_cma {
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struct drm_fb_helper fb_helper;
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const struct drm_framebuffer_funcs *fb_funcs;
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};
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/**
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* DOC: framebuffer cma helper functions
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*
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* Provides helper functions for creating a cma (contiguous memory allocator)
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* backed framebuffer.
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*
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* drm_fb_cma_create() is used in the &drm_mode_config_funcs.fb_create
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* callback function to create a cma backed framebuffer.
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*
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* An fbdev framebuffer backed by cma is also available by calling
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* drm_fbdev_cma_init(). drm_fbdev_cma_fini() tears it down.
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* If the &drm_framebuffer_funcs.dirty callback is set, fb_deferred_io will be
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* set up automatically. &drm_framebuffer_funcs.dirty is called by
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* drm_fb_helper_deferred_io() in process context (&struct delayed_work).
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*
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* Example fbdev deferred io code::
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*
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* static int driver_fb_dirty(struct drm_framebuffer *fb,
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* struct drm_file *file_priv,
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* unsigned flags, unsigned color,
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* struct drm_clip_rect *clips,
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* unsigned num_clips)
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* {
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* struct drm_gem_cma_object *cma = drm_fb_cma_get_gem_obj(fb, 0);
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* ... push changes ...
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* return 0;
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* }
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*
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* static struct drm_framebuffer_funcs driver_fb_funcs = {
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* .destroy = drm_fb_cma_destroy,
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* .create_handle = drm_fb_cma_create_handle,
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* .dirty = driver_fb_dirty,
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* };
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*
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* Initialize::
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*
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* fbdev = drm_fbdev_cma_init_with_funcs(dev, 16,
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* dev->mode_config.num_crtc,
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* dev->mode_config.num_connector,
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* &driver_fb_funcs);
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*
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*/
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static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
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{
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return container_of(helper, struct drm_fbdev_cma, fb_helper);
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}
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void drm_fb_cma_destroy(struct drm_framebuffer *fb)
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{
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drm_gem_fb_destroy(fb);
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}
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EXPORT_SYMBOL(drm_fb_cma_destroy);
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int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
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struct drm_file *file_priv, unsigned int *handle)
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{
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return drm_gem_fb_create_handle(fb, file_priv, handle);
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}
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EXPORT_SYMBOL(drm_fb_cma_create_handle);
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/**
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* drm_fb_cma_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_priv: drm file for the ioctl call
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* @mode_cmd: metadata from the userspace fb 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 can be used to set &drm_framebuffer_funcs for drivers that need the
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* &drm_framebuffer_funcs.dirty callback. Use drm_fb_cma_create() if you don't
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* need to change &drm_framebuffer_funcs.
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*/
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struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
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struct drm_file *file_priv, 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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return drm_gem_fb_create_with_funcs(dev, file_priv, mode_cmd, funcs);
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
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/**
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* drm_fb_cma_create() - &drm_mode_config_funcs.fb_create callback function
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* @dev: DRM device
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* @file_priv: drm file for the ioctl call
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* @mode_cmd: metadata from the userspace fb creation request
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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. Use drm_fb_cma_create_with_funcs() if
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* you need to set &drm_framebuffer_funcs.dirty.
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*/
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struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
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struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
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{
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return drm_gem_fb_create(dev, file_priv, mode_cmd);
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_create);
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/**
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* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
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* @fb: The framebuffer
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* @plane: Which plane
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*
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* Return the CMA GEM object for given framebuffer.
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*
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* This function will usually be called from the CRTC callback functions.
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*/
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struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
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unsigned int plane)
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{
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struct drm_gem_object *gem;
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gem = drm_gem_fb_get_obj(fb, plane);
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if (!gem)
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return NULL;
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return to_drm_gem_cma_obj(gem);
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
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/**
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* drm_fb_cma_get_gem_addr() - Get physical address for framebuffer
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* @fb: The framebuffer
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* @state: Which state of drm plane
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* @plane: Which plane
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* Return the CMA GEM address for given framebuffer.
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*
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* This function will usually be called from the PLANE callback functions.
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*/
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dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
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struct drm_plane_state *state,
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unsigned int plane)
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{
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struct drm_gem_cma_object *obj;
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dma_addr_t paddr;
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obj = drm_fb_cma_get_gem_obj(fb, plane);
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if (!obj)
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return 0;
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paddr = obj->paddr + fb->offsets[plane];
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paddr += fb->format->cpp[plane] * (state->src_x >> 16);
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paddr += fb->pitches[plane] * (state->src_y >> 16);
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return paddr;
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
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/**
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* drm_fb_cma_prepare_fb() - Prepare CMA framebuffer
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* @plane: Which plane
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* @state: Plane state attach fence to
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*
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* This should be set as the &struct drm_plane_helper_funcs.prepare_fb hook.
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*
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* This function checks if the plane FB has an dma-buf attached, extracts
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* the exclusive fence and attaches it to plane state for the atomic helper
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* to wait on.
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*
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* There is no need for cleanup_fb for CMA based framebuffer drivers.
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*/
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int drm_fb_cma_prepare_fb(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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return drm_gem_fb_prepare_fb(plane, state);
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
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#ifdef CONFIG_DEBUG_FS
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static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
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{
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int i;
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seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
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(char *)&fb->format->format);
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for (i = 0; i < fb->format->num_planes; i++) {
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seq_printf(m, " %d: offset=%d pitch=%d, obj: ",
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i, fb->offsets[i], fb->pitches[i]);
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drm_gem_cma_describe(drm_fb_cma_get_gem_obj(fb, i), m);
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}
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}
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/**
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* drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
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* in debugfs.
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* @m: output file
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* @arg: private data for the callback
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*/
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int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
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{
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struct drm_info_node *node = (struct drm_info_node *) m->private;
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struct drm_device *dev = node->minor->dev;
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struct drm_framebuffer *fb;
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mutex_lock(&dev->mode_config.fb_lock);
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drm_for_each_fb(fb, dev)
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drm_fb_cma_describe(fb, m);
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mutex_unlock(&dev->mode_config.fb_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
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#endif
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static int drm_fb_cma_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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return dma_mmap_writecombine(info->device, vma, info->screen_base,
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info->fix.smem_start, info->fix.smem_len);
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}
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static struct fb_ops drm_fbdev_cma_ops = {
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.owner = THIS_MODULE,
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DRM_FB_HELPER_DEFAULT_OPS,
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.fb_fillrect = drm_fb_helper_sys_fillrect,
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.fb_copyarea = drm_fb_helper_sys_copyarea,
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.fb_imageblit = drm_fb_helper_sys_imageblit,
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.fb_mmap = drm_fb_cma_mmap,
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};
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static int drm_fbdev_cma_deferred_io_mmap(struct fb_info *info,
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struct vm_area_struct *vma)
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{
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fb_deferred_io_mmap(info, vma);
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vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
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return 0;
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}
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static int drm_fbdev_cma_defio_init(struct fb_info *fbi,
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struct drm_gem_cma_object *cma_obj)
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{
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struct fb_deferred_io *fbdefio;
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struct fb_ops *fbops;
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/*
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* Per device structures are needed because:
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* fbops: fb_deferred_io_cleanup() clears fbops.fb_mmap
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* fbdefio: individual delays
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*/
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fbdefio = kzalloc(sizeof(*fbdefio), GFP_KERNEL);
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fbops = kzalloc(sizeof(*fbops), GFP_KERNEL);
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if (!fbdefio || !fbops) {
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kfree(fbdefio);
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kfree(fbops);
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return -ENOMEM;
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}
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/* can't be offset from vaddr since dirty() uses cma_obj */
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fbi->screen_buffer = cma_obj->vaddr;
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/* fb_deferred_io_fault() needs a physical address */
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fbi->fix.smem_start = page_to_phys(virt_to_page(fbi->screen_buffer));
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*fbops = *fbi->fbops;
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fbi->fbops = fbops;
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fbdefio->delay = msecs_to_jiffies(DEFAULT_FBDEFIO_DELAY_MS);
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fbdefio->deferred_io = drm_fb_helper_deferred_io;
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fbi->fbdefio = fbdefio;
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fb_deferred_io_init(fbi);
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fbi->fbops->fb_mmap = drm_fbdev_cma_deferred_io_mmap;
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return 0;
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}
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static void drm_fbdev_cma_defio_fini(struct fb_info *fbi)
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{
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if (!fbi->fbdefio)
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return;
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fb_deferred_io_cleanup(fbi);
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kfree(fbi->fbdefio);
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kfree(fbi->fbops);
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}
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static int
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drm_fbdev_cma_create(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes)
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{
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struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
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struct drm_device *dev = helper->dev;
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struct drm_gem_cma_object *obj;
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struct drm_framebuffer *fb;
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unsigned int bytes_per_pixel;
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unsigned long offset;
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struct fb_info *fbi;
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size_t size;
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int ret;
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DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
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sizes->surface_width, sizes->surface_height,
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sizes->surface_bpp);
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bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
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size = sizes->surface_width * sizes->surface_height * bytes_per_pixel;
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obj = drm_gem_cma_create(dev, size);
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if (IS_ERR(obj))
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return -ENOMEM;
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fbi = drm_fb_helper_alloc_fbi(helper);
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if (IS_ERR(fbi)) {
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ret = PTR_ERR(fbi);
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goto err_gem_free_object;
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}
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fb = drm_gem_fbdev_fb_create(dev, sizes, 0, &obj->base,
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fbdev_cma->fb_funcs);
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if (IS_ERR(fb)) {
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dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
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ret = PTR_ERR(fb);
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goto err_fb_info_destroy;
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}
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helper->fb = fb;
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fbi->par = helper;
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fbi->flags = FBINFO_FLAG_DEFAULT;
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fbi->fbops = &drm_fbdev_cma_ops;
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drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
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drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
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offset = fbi->var.xoffset * bytes_per_pixel;
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offset += fbi->var.yoffset * fb->pitches[0];
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dev->mode_config.fb_base = (resource_size_t)obj->paddr;
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fbi->screen_base = obj->vaddr + offset;
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fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
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fbi->screen_size = size;
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fbi->fix.smem_len = size;
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if (fbdev_cma->fb_funcs->dirty) {
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ret = drm_fbdev_cma_defio_init(fbi, obj);
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if (ret)
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goto err_cma_destroy;
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}
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return 0;
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err_cma_destroy:
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drm_framebuffer_remove(fb);
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err_fb_info_destroy:
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drm_fb_helper_fini(helper);
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err_gem_free_object:
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drm_gem_object_put_unlocked(&obj->base);
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return ret;
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}
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static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
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.fb_probe = drm_fbdev_cma_create,
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};
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/**
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* drm_fbdev_cma_init_with_funcs() - Allocate and initializes a drm_fbdev_cma struct
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* @dev: DRM device
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* @preferred_bpp: Preferred bits per pixel for the device
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* @max_conn_count: Maximum number of connectors
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* @funcs: fb helper functions, in particular a custom dirty() callback
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*
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* Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
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*/
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struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
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unsigned int preferred_bpp, unsigned int max_conn_count,
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const struct drm_framebuffer_funcs *funcs)
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{
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struct drm_fbdev_cma *fbdev_cma;
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struct drm_fb_helper *helper;
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int ret;
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fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
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if (!fbdev_cma) {
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dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
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return ERR_PTR(-ENOMEM);
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}
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fbdev_cma->fb_funcs = funcs;
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helper = &fbdev_cma->fb_helper;
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drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
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ret = drm_fb_helper_init(dev, helper, max_conn_count);
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if (ret < 0) {
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dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
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goto err_free;
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}
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ret = drm_fb_helper_single_add_all_connectors(helper);
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if (ret < 0) {
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dev_err(dev->dev, "Failed to add connectors.\n");
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goto err_drm_fb_helper_fini;
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}
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ret = drm_fb_helper_initial_config(helper, preferred_bpp);
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if (ret < 0) {
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dev_err(dev->dev, "Failed to set initial hw configuration.\n");
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goto err_drm_fb_helper_fini;
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}
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return fbdev_cma;
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err_drm_fb_helper_fini:
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drm_fb_helper_fini(helper);
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err_free:
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kfree(fbdev_cma);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
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static const struct drm_framebuffer_funcs drm_fb_cma_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_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
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* @dev: DRM device
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* @preferred_bpp: Preferred bits per pixel for the device
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* @max_conn_count: Maximum number of connectors
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*
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* Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
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*/
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struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
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unsigned int preferred_bpp, unsigned int max_conn_count)
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{
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return drm_fbdev_cma_init_with_funcs(dev, preferred_bpp,
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max_conn_count,
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&drm_fb_cma_funcs);
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}
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EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
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/**
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* drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
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* @fbdev_cma: The drm_fbdev_cma struct
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*/
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void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
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{
|
|
drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
|
|
if (fbdev_cma->fb_helper.fbdev)
|
|
drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
|
|
|
|
if (fbdev_cma->fb_helper.fb)
|
|
drm_framebuffer_remove(fbdev_cma->fb_helper.fb);
|
|
|
|
drm_fb_helper_fini(&fbdev_cma->fb_helper);
|
|
kfree(fbdev_cma);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
|
|
|
|
/**
|
|
* drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
|
|
* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
|
|
*
|
|
* This function is usually called from the &drm_driver.lastclose callback.
|
|
*/
|
|
void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
|
|
{
|
|
if (fbdev_cma)
|
|
drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
|
|
|
|
/**
|
|
* drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
|
|
* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
|
|
*
|
|
* This function is usually called from the &drm_mode_config.output_poll_changed
|
|
* callback.
|
|
*/
|
|
void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
|
|
{
|
|
if (fbdev_cma)
|
|
drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
|
|
|
|
/**
|
|
* drm_fbdev_cma_set_suspend - wrapper around drm_fb_helper_set_suspend
|
|
* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
|
|
* @state: desired state, zero to resume, non-zero to suspend
|
|
*
|
|
* Calls drm_fb_helper_set_suspend, which is a wrapper around
|
|
* fb_set_suspend implemented by fbdev core.
|
|
*/
|
|
void drm_fbdev_cma_set_suspend(struct drm_fbdev_cma *fbdev_cma, bool state)
|
|
{
|
|
if (fbdev_cma)
|
|
drm_fb_helper_set_suspend(&fbdev_cma->fb_helper, state);
|
|
}
|
|
EXPORT_SYMBOL(drm_fbdev_cma_set_suspend);
|
|
|
|
/**
|
|
* drm_fbdev_cma_set_suspend_unlocked - wrapper around
|
|
* drm_fb_helper_set_suspend_unlocked
|
|
* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
|
|
* @state: desired state, zero to resume, non-zero to suspend
|
|
*
|
|
* Calls drm_fb_helper_set_suspend, which is a wrapper around
|
|
* fb_set_suspend implemented by fbdev core.
|
|
*/
|
|
void drm_fbdev_cma_set_suspend_unlocked(struct drm_fbdev_cma *fbdev_cma,
|
|
bool state)
|
|
{
|
|
if (fbdev_cma)
|
|
drm_fb_helper_set_suspend_unlocked(&fbdev_cma->fb_helper,
|
|
state);
|
|
}
|
|
EXPORT_SYMBOL(drm_fbdev_cma_set_suspend_unlocked);
|