mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 12:46:40 +07:00
10a2310265
To implement hotplug detection in a race-free manner, drivers must call drm_kms_helper_poll_init() before hotplug events can be triggered. Such events can be triggered right after any of the encoders or connectors are initialized. At the same time, if the drm_fb_helper_hotplug_event() helper is used by a driver, then the poll helper requires some parts of the FB helper to be initialized to prevent a crash. At the same time, drm_fb_helper_init() requires information that is not necessarily available at such an early stage (number of CRTCs and connectors), so it cannot be used yet. Add a new helper, drm_fb_helper_prepare(), that initializes the bare minimum needed to allow drm_kms_helper_poll_init() to execute and any subsequent hotplug events to be processed properly. Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
451 lines
12 KiB
C
451 lines
12 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_crtc.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_gem_cma_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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struct drm_fb_cma {
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struct drm_framebuffer fb;
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struct drm_gem_cma_object *obj[4];
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};
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struct drm_fbdev_cma {
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struct drm_fb_helper fb_helper;
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struct drm_fb_cma *fb;
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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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static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
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{
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return container_of(fb, struct drm_fb_cma, fb);
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}
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static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
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{
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struct drm_fb_cma *fb_cma = to_fb_cma(fb);
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int i;
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for (i = 0; i < 4; i++) {
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if (fb_cma->obj[i])
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drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
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}
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drm_framebuffer_cleanup(fb);
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kfree(fb_cma);
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}
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static 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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struct drm_fb_cma *fb_cma = to_fb_cma(fb);
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return drm_gem_handle_create(file_priv,
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&fb_cma->obj[0]->base, handle);
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}
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static struct drm_framebuffer_funcs drm_fb_cma_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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};
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static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
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struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
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unsigned int num_planes)
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{
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struct drm_fb_cma *fb_cma;
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int ret;
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int i;
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fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
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if (!fb_cma)
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return ERR_PTR(-ENOMEM);
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drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
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for (i = 0; i < num_planes; i++)
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fb_cma->obj[i] = obj[i];
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ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
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if (ret) {
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dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
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kfree(fb_cma);
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return ERR_PTR(ret);
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}
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return fb_cma;
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}
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/**
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* drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
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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.
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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, struct drm_mode_fb_cmd2 *mode_cmd)
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{
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struct drm_fb_cma *fb_cma;
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struct drm_gem_cma_object *objs[4];
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struct drm_gem_object *obj;
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unsigned int hsub;
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unsigned int vsub;
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int ret;
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int i;
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hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
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vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
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for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
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unsigned int width = mode_cmd->width / (i ? hsub : 1);
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unsigned int height = mode_cmd->height / (i ? vsub : 1);
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unsigned int min_size;
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obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
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if (!obj) {
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dev_err(dev->dev, "Failed to lookup GEM object\n");
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ret = -ENXIO;
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goto err_gem_object_unreference;
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}
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min_size = (height - 1) * mode_cmd->pitches[i]
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+ width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
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+ mode_cmd->offsets[i];
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if (obj->size < min_size) {
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drm_gem_object_unreference_unlocked(obj);
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ret = -EINVAL;
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goto err_gem_object_unreference;
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}
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objs[i] = to_drm_gem_cma_obj(obj);
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}
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fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
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if (IS_ERR(fb_cma)) {
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ret = PTR_ERR(fb_cma);
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goto err_gem_object_unreference;
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}
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return &fb_cma->fb;
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err_gem_object_unreference:
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for (i--; i >= 0; i--)
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drm_gem_object_unreference_unlocked(&objs[i]->base);
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return ERR_PTR(ret);
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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_fb_cma *fb_cma = to_fb_cma(fb);
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if (plane >= 4)
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return NULL;
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return fb_cma->obj[plane];
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}
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EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
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#ifdef CONFIG_DEBUG_FS
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/*
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* drm_fb_cma_describe() - Helper to dump information about a single
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* CMA framebuffer object
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*/
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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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struct drm_fb_cma *fb_cma = to_fb_cma(fb);
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int i, n = drm_format_num_planes(fb->pixel_format);
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seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
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(char *)&fb->pixel_format);
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for (i = 0; i < n; 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(fb_cma->obj[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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*/
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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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int ret;
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ret = mutex_lock_interruptible(&dev->mode_config.mutex);
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if (ret)
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return ret;
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ret = mutex_lock_interruptible(&dev->struct_mutex);
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if (ret) {
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mutex_unlock(&dev->mode_config.mutex);
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return ret;
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}
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list_for_each_entry(fb, &dev->mode_config.fb_list, head)
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drm_fb_cma_describe(fb, m);
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mutex_unlock(&dev->struct_mutex);
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mutex_unlock(&dev->mode_config.mutex);
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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 struct fb_ops drm_fbdev_cma_ops = {
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.owner = THIS_MODULE,
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.fb_fillrect = sys_fillrect,
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.fb_copyarea = sys_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_check_var = drm_fb_helper_check_var,
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.fb_set_par = drm_fb_helper_set_par,
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.fb_blank = drm_fb_helper_blank,
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.fb_pan_display = drm_fb_helper_pan_display,
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.fb_setcmap = drm_fb_helper_setcmap,
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};
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static int 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_mode_fb_cmd2 mode_cmd = { 0 };
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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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mode_cmd.width = sizes->surface_width;
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mode_cmd.height = sizes->surface_height;
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mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
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mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
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sizes->surface_depth);
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size = mode_cmd.pitches[0] * mode_cmd.height;
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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 = framebuffer_alloc(0, dev->dev);
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if (!fbi) {
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dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
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ret = -ENOMEM;
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goto err_drm_gem_cma_free_object;
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}
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fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
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if (IS_ERR(fbdev_cma->fb)) {
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dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
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ret = PTR_ERR(fbdev_cma->fb);
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goto err_framebuffer_release;
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}
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fb = &fbdev_cma->fb->fb;
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helper->fb = fb;
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helper->fbdev = fbi;
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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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ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
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if (ret) {
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dev_err(dev->dev, "Failed to allocate color map.\n");
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goto err_drm_fb_cma_destroy;
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}
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drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
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drm_fb_helper_fill_var(fbi, helper, fb->width, 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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return 0;
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err_drm_fb_cma_destroy:
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drm_framebuffer_unregister_private(fb);
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drm_fb_cma_destroy(fb);
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err_framebuffer_release:
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framebuffer_release(fbi);
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err_drm_gem_cma_free_object:
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drm_gem_cma_free_object(&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() - 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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* @num_crtc: Number of CRTCs
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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 num_crtc,
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unsigned int max_conn_count)
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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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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, num_crtc, 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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/* disable all the possible outputs/crtcs before entering KMS mode */
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drm_helper_disable_unused_functions(dev);
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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);
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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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{
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if (fbdev_cma->fb_helper.fbdev) {
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struct fb_info *info;
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int ret;
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info = fbdev_cma->fb_helper.fbdev;
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ret = unregister_framebuffer(info);
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if (ret < 0)
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DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
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if (info->cmap.len)
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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}
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if (fbdev_cma->fb) {
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drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);
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drm_fb_cma_destroy(&fbdev_cma->fb->fb);
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}
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drm_fb_helper_fini(&fbdev_cma->fb_helper);
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kfree(fbdev_cma);
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}
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EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
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/**
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* drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
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* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
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*
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* This function is usually called from the DRM drivers lastclose callback.
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*/
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void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
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{
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if (fbdev_cma)
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drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev_cma->fb_helper);
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}
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EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
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/**
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* drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
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* @fbdev_cma: The drm_fbdev_cma struct, may be NULL
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*
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* This function is usually called from the DRM drivers output_poll_changed
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* callback.
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*/
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void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
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{
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if (fbdev_cma)
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drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
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}
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EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);
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