/*
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* Copyright (c) 2015 MediaTek Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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_helper.h>
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#include <drm/drm_fb_helper.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 <linux/dma-buf.h>
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#include <linux/reservation.h>
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#include "mtk_drm_drv.h"
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#include "mtk_drm_fb.h"
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#include "mtk_drm_gem.h"
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static const struct drm_framebuffer_funcs mtk_drm_fb_funcs = {
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.create_handle = drm_gem_fb_create_handle,
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.destroy = drm_gem_fb_destroy,
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};
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static struct drm_framebuffer *mtk_drm_framebuffer_init(struct drm_device *dev,
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const struct drm_mode_fb_cmd2 *mode,
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struct drm_gem_object *obj)
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{
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struct drm_framebuffer *fb;
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int ret;
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if (drm_format_num_planes(mode->pixel_format) != 1)
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return ERR_PTR(-EINVAL);
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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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drm_helper_mode_fill_fb_struct(dev, fb, mode);
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fb->obj[0] = obj;
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ret = drm_framebuffer_init(dev, fb, &mtk_drm_fb_funcs);
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if (ret) {
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DRM_ERROR("failed to initialize framebuffer\n");
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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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/*
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* Wait for any exclusive fence in fb's gem object's reservation object.
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*
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* Returns -ERESTARTSYS if interrupted, else 0.
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*/
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int mtk_fb_wait(struct drm_framebuffer *fb)
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{
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struct drm_gem_object *gem;
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struct reservation_object *resv;
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long ret;
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if (!fb)
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return 0;
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gem = fb->obj[0];
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if (!gem || !gem->dma_buf || !gem->dma_buf->resv)
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return 0;
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resv = gem->dma_buf->resv;
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ret = reservation_object_wait_timeout_rcu(resv, false, true,
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MAX_SCHEDULE_TIMEOUT);
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/* MAX_SCHEDULE_TIMEOUT on success, -ERESTARTSYS if interrupted */
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if (WARN_ON(ret < 0))
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return ret;
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return 0;
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}
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struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
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struct drm_file *file,
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const struct drm_mode_fb_cmd2 *cmd)
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{
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struct drm_framebuffer *fb;
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struct drm_gem_object *gem;
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unsigned int width = cmd->width;
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unsigned int height = cmd->height;
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unsigned int size, bpp;
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int ret;
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if (drm_format_num_planes(cmd->pixel_format) != 1)
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return ERR_PTR(-EINVAL);
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gem = drm_gem_object_lookup(file, cmd->handles[0]);
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if (!gem)
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return ERR_PTR(-ENOENT);
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bpp = drm_format_plane_cpp(cmd->pixel_format, 0);
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size = (height - 1) * cmd->pitches[0] + width * bpp;
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size += cmd->offsets[0];
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if (gem->size < size) {
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ret = -EINVAL;
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goto unreference;
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}
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fb = mtk_drm_framebuffer_init(dev, cmd, gem);
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if (IS_ERR(fb)) {
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ret = PTR_ERR(fb);
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goto unreference;
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}
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return fb;
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unreference:
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drm_gem_object_put_unlocked(gem);
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return ERR_PTR(ret);
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}
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