958 lines
26 KiB
C
958 lines
26 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <linux/export.h>
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#include <drm/drmP.h>
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#include <drm/drm_auth.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_atomic.h>
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#include "drm_crtc_internal.h"
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/**
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* DOC: overview
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*
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* Frame buffers are abstract memory objects that provide a source of pixels to
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* scanout to a CRTC. Applications explicitly request the creation of frame
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* buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and receive an opaque
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* handle that can be passed to the KMS CRTC control, plane configuration and
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* page flip functions.
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*
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* Frame buffers rely on the underlying memory manager for allocating backing
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* storage. When creating a frame buffer applications pass a memory handle
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* (or a list of memory handles for multi-planar formats) through the
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* &struct drm_mode_fb_cmd2 argument. For drivers using GEM as their userspace
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* buffer management interface this would be a GEM handle. Drivers are however
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* free to use their own backing storage object handles, e.g. vmwgfx directly
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* exposes special TTM handles to userspace and so expects TTM handles in the
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* create ioctl and not GEM handles.
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*
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* Framebuffers are tracked with &struct drm_framebuffer. They are published
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* using drm_framebuffer_init() - after calling that function userspace can use
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* and access the framebuffer object. The helper function
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* drm_helper_mode_fill_fb_struct() can be used to pre-fill the required
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* metadata fields.
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*
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* The lifetime of a drm framebuffer is controlled with a reference count,
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* drivers can grab additional references with drm_framebuffer_get() and drop
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* them again with drm_framebuffer_put(). For driver-private framebuffers for
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* which the last reference is never dropped (e.g. for the fbdev framebuffer
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* when the struct &struct drm_framebuffer is embedded into the fbdev helper
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* struct) drivers can manually clean up a framebuffer at module unload time
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* with drm_framebuffer_unregister_private(). But doing this is not
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* recommended, and it's better to have a normal free-standing &struct
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* drm_framebuffer.
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*/
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int drm_framebuffer_check_src_coords(uint32_t src_x, uint32_t src_y,
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uint32_t src_w, uint32_t src_h,
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const struct drm_framebuffer *fb)
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{
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unsigned int fb_width, fb_height;
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fb_width = fb->width << 16;
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fb_height = fb->height << 16;
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/* Make sure source coordinates are inside the fb. */
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if (src_w > fb_width ||
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src_x > fb_width - src_w ||
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src_h > fb_height ||
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src_y > fb_height - src_h) {
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DRM_DEBUG_KMS("Invalid source coordinates "
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"%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
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src_w >> 16, ((src_w & 0xffff) * 15625) >> 10,
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src_h >> 16, ((src_h & 0xffff) * 15625) >> 10,
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src_x >> 16, ((src_x & 0xffff) * 15625) >> 10,
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src_y >> 16, ((src_y & 0xffff) * 15625) >> 10);
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return -ENOSPC;
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}
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return 0;
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}
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/**
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* drm_mode_addfb - add an FB to the graphics configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Add a new FB to the specified CRTC, given a user request. This is the
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* original addfb ioctl which only supported RGB formats.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_addfb(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_mode_fb_cmd *or = data;
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struct drm_mode_fb_cmd2 r = {};
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int ret;
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/* convert to new format and call new ioctl */
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r.fb_id = or->fb_id;
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r.width = or->width;
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r.height = or->height;
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r.pitches[0] = or->pitch;
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r.pixel_format = drm_mode_legacy_fb_format(or->bpp, or->depth);
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r.handles[0] = or->handle;
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ret = drm_mode_addfb2(dev, &r, file_priv);
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if (ret)
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return ret;
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or->fb_id = r.fb_id;
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return 0;
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}
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static int fb_plane_width(int width,
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const struct drm_format_info *format, int plane)
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{
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if (plane == 0)
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return width;
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return DIV_ROUND_UP(width, format->hsub);
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}
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static int fb_plane_height(int height,
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const struct drm_format_info *format, int plane)
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{
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if (plane == 0)
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return height;
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return DIV_ROUND_UP(height, format->vsub);
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}
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static int framebuffer_check(struct drm_device *dev,
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const struct drm_mode_fb_cmd2 *r)
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{
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const struct drm_format_info *info;
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int i;
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/* check if the format is supported at all */
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info = __drm_format_info(r->pixel_format & ~DRM_FORMAT_BIG_ENDIAN);
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if (!info) {
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struct drm_format_name_buf format_name;
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DRM_DEBUG_KMS("bad framebuffer format %s\n",
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drm_get_format_name(r->pixel_format,
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&format_name));
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return -EINVAL;
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}
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/* now let the driver pick its own format info */
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info = drm_get_format_info(dev, r);
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if (r->width == 0) {
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DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
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return -EINVAL;
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}
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if (r->height == 0) {
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DRM_DEBUG_KMS("bad framebuffer height %u\n", r->height);
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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 = fb_plane_width(r->width, info, i);
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unsigned int height = fb_plane_height(r->height, info, i);
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unsigned int cpp = info->cpp[i];
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if (!r->handles[i]) {
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DRM_DEBUG_KMS("no buffer object handle for plane %d\n", i);
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return -EINVAL;
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}
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if ((uint64_t) width * cpp > UINT_MAX)
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return -ERANGE;
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if ((uint64_t) height * r->pitches[i] + r->offsets[i] > UINT_MAX)
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return -ERANGE;
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if (r->pitches[i] < width * cpp) {
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DRM_DEBUG_KMS("bad pitch %u for plane %d\n", r->pitches[i], i);
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return -EINVAL;
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}
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if (r->modifier[i] && !(r->flags & DRM_MODE_FB_MODIFIERS)) {
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DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
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r->modifier[i], i);
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return -EINVAL;
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}
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if (r->flags & DRM_MODE_FB_MODIFIERS &&
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r->modifier[i] != r->modifier[0]) {
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DRM_DEBUG_KMS("bad fb modifier %llu for plane %d\n",
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r->modifier[i], i);
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return -EINVAL;
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}
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/* modifier specific checks: */
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switch (r->modifier[i]) {
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case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
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/* NOTE: the pitch restriction may be lifted later if it turns
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* out that no hw has this restriction:
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*/
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if (r->pixel_format != DRM_FORMAT_NV12 ||
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width % 128 || height % 32 ||
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r->pitches[i] % 128) {
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DRM_DEBUG_KMS("bad modifier data for plane %d\n", i);
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return -EINVAL;
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}
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break;
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default:
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break;
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}
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}
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for (i = info->num_planes; i < 4; i++) {
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if (r->modifier[i]) {
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DRM_DEBUG_KMS("non-zero modifier for unused plane %d\n", i);
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return -EINVAL;
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}
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/* Pre-FB_MODIFIERS userspace didn't clear the structs properly. */
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if (!(r->flags & DRM_MODE_FB_MODIFIERS))
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continue;
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if (r->handles[i]) {
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DRM_DEBUG_KMS("buffer object handle for unused plane %d\n", i);
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return -EINVAL;
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}
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if (r->pitches[i]) {
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DRM_DEBUG_KMS("non-zero pitch for unused plane %d\n", i);
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return -EINVAL;
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}
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if (r->offsets[i]) {
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DRM_DEBUG_KMS("non-zero offset for unused plane %d\n", i);
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return -EINVAL;
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}
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}
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return 0;
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}
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struct drm_framebuffer *
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drm_internal_framebuffer_create(struct drm_device *dev,
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const struct drm_mode_fb_cmd2 *r,
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struct drm_file *file_priv)
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{
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struct drm_mode_config *config = &dev->mode_config;
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struct drm_framebuffer *fb;
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int ret;
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if (r->flags & ~(DRM_MODE_FB_INTERLACED | DRM_MODE_FB_MODIFIERS)) {
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DRM_DEBUG_KMS("bad framebuffer flags 0x%08x\n", r->flags);
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return ERR_PTR(-EINVAL);
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}
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if ((config->min_width > r->width) || (r->width > config->max_width)) {
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DRM_DEBUG_KMS("bad framebuffer width %d, should be >= %d && <= %d\n",
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r->width, config->min_width, config->max_width);
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return ERR_PTR(-EINVAL);
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}
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if ((config->min_height > r->height) || (r->height > config->max_height)) {
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DRM_DEBUG_KMS("bad framebuffer height %d, should be >= %d && <= %d\n",
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r->height, config->min_height, config->max_height);
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return ERR_PTR(-EINVAL);
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}
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if (r->flags & DRM_MODE_FB_MODIFIERS &&
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!dev->mode_config.allow_fb_modifiers) {
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DRM_DEBUG_KMS("driver does not support fb modifiers\n");
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return ERR_PTR(-EINVAL);
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}
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ret = framebuffer_check(dev, r);
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if (ret)
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return ERR_PTR(ret);
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fb = dev->mode_config.funcs->fb_create(dev, file_priv, r);
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if (IS_ERR(fb)) {
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DRM_DEBUG_KMS("could not create framebuffer\n");
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return fb;
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}
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return fb;
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}
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/**
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* drm_mode_addfb2 - add an FB to the graphics configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Add a new FB to the specified CRTC, given a user request with format. This is
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* the 2nd version of the addfb ioctl, which supports multi-planar framebuffers
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* and uses fourcc codes as pixel format specifiers.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_addfb2(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_mode_fb_cmd2 *r = data;
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struct drm_framebuffer *fb;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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fb = drm_internal_framebuffer_create(dev, r, file_priv);
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if (IS_ERR(fb))
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return PTR_ERR(fb);
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DRM_DEBUG_KMS("[FB:%d]\n", fb->base.id);
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r->fb_id = fb->base.id;
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/* Transfer ownership to the filp for reaping on close */
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mutex_lock(&file_priv->fbs_lock);
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list_add(&fb->filp_head, &file_priv->fbs);
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mutex_unlock(&file_priv->fbs_lock);
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return 0;
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}
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struct drm_mode_rmfb_work {
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struct work_struct work;
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struct list_head fbs;
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};
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static void drm_mode_rmfb_work_fn(struct work_struct *w)
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{
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struct drm_mode_rmfb_work *arg = container_of(w, typeof(*arg), work);
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while (!list_empty(&arg->fbs)) {
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struct drm_framebuffer *fb =
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list_first_entry(&arg->fbs, typeof(*fb), filp_head);
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list_del_init(&fb->filp_head);
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drm_framebuffer_remove(fb);
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}
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}
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/**
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* drm_mode_rmfb - remove an FB from the configuration
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Remove the FB specified by the user.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_rmfb(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_framebuffer *fb = NULL;
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struct drm_framebuffer *fbl = NULL;
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uint32_t *id = data;
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int found = 0;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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fb = drm_framebuffer_lookup(dev, *id);
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if (!fb)
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return -ENOENT;
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mutex_lock(&file_priv->fbs_lock);
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list_for_each_entry(fbl, &file_priv->fbs, filp_head)
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if (fb == fbl)
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found = 1;
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if (!found) {
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mutex_unlock(&file_priv->fbs_lock);
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goto fail_unref;
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}
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list_del_init(&fb->filp_head);
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mutex_unlock(&file_priv->fbs_lock);
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/* drop the reference we picked up in framebuffer lookup */
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drm_framebuffer_put(fb);
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/*
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* we now own the reference that was stored in the fbs list
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*
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* drm_framebuffer_remove may fail with -EINTR on pending signals,
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* so run this in a separate stack as there's no way to correctly
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* handle this after the fb is already removed from the lookup table.
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*/
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if (drm_framebuffer_read_refcount(fb) > 1) {
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struct drm_mode_rmfb_work arg;
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INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
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INIT_LIST_HEAD(&arg.fbs);
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list_add_tail(&fb->filp_head, &arg.fbs);
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schedule_work(&arg.work);
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flush_work(&arg.work);
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destroy_work_on_stack(&arg.work);
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} else
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drm_framebuffer_put(fb);
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return 0;
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fail_unref:
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drm_framebuffer_put(fb);
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return -ENOENT;
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}
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/**
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* drm_mode_getfb - get FB info
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Lookup the FB given its ID and return info about it.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_getfb(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_mode_fb_cmd *r = data;
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struct drm_framebuffer *fb;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return -EINVAL;
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fb = drm_framebuffer_lookup(dev, r->fb_id);
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if (!fb)
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return -ENOENT;
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r->height = fb->height;
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r->width = fb->width;
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r->depth = fb->format->depth;
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r->bpp = fb->format->cpp[0] * 8;
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r->pitch = fb->pitches[0];
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if (fb->funcs->create_handle) {
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if (drm_is_current_master(file_priv) || capable(CAP_SYS_ADMIN) ||
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drm_is_control_client(file_priv)) {
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ret = fb->funcs->create_handle(fb, file_priv,
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&r->handle);
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} else {
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/* GET_FB() is an unprivileged ioctl so we must not
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* return a buffer-handle to non-master processes! For
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* backwards-compatibility reasons, we cannot make
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* GET_FB() privileged, so just return an invalid handle
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* for non-masters. */
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r->handle = 0;
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ret = 0;
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}
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} else {
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ret = -ENODEV;
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}
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drm_framebuffer_put(fb);
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return ret;
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}
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/**
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* drm_mode_dirtyfb_ioctl - flush frontbuffer rendering on an FB
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* @dev: drm device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: drm file for the ioctl call
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*
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* Lookup the FB and flush out the damaged area supplied by userspace as a clip
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* rectangle list. Generic userspace which does frontbuffer rendering must call
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* this ioctl to flush out the changes on manual-update display outputs, e.g.
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* usb display-link, mipi manual update panels or edp panel self refresh modes.
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*
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* Modesetting drivers which always update the frontbuffer do not need to
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* implement the corresponding &drm_framebuffer_funcs.dirty callback.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
|
|
int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
|
|
void *data, struct drm_file *file_priv)
|
|
{
|
|
struct drm_clip_rect __user *clips_ptr;
|
|
struct drm_clip_rect *clips = NULL;
|
|
struct drm_mode_fb_dirty_cmd *r = data;
|
|
struct drm_framebuffer *fb;
|
|
unsigned flags;
|
|
int num_clips;
|
|
int ret;
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return -EINVAL;
|
|
|
|
fb = drm_framebuffer_lookup(dev, r->fb_id);
|
|
if (!fb)
|
|
return -ENOENT;
|
|
|
|
num_clips = r->num_clips;
|
|
clips_ptr = (struct drm_clip_rect __user *)(unsigned long)r->clips_ptr;
|
|
|
|
if (!num_clips != !clips_ptr) {
|
|
ret = -EINVAL;
|
|
goto out_err1;
|
|
}
|
|
|
|
flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;
|
|
|
|
/* If userspace annotates copy, clips must come in pairs */
|
|
if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {
|
|
ret = -EINVAL;
|
|
goto out_err1;
|
|
}
|
|
|
|
if (num_clips && clips_ptr) {
|
|
if (num_clips < 0 || num_clips > DRM_MODE_FB_DIRTY_MAX_CLIPS) {
|
|
ret = -EINVAL;
|
|
goto out_err1;
|
|
}
|
|
clips = kcalloc(num_clips, sizeof(*clips), GFP_KERNEL);
|
|
if (!clips) {
|
|
ret = -ENOMEM;
|
|
goto out_err1;
|
|
}
|
|
|
|
ret = copy_from_user(clips, clips_ptr,
|
|
num_clips * sizeof(*clips));
|
|
if (ret) {
|
|
ret = -EFAULT;
|
|
goto out_err2;
|
|
}
|
|
}
|
|
|
|
if (fb->funcs->dirty) {
|
|
ret = fb->funcs->dirty(fb, file_priv, flags, r->color,
|
|
clips, num_clips);
|
|
} else {
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
out_err2:
|
|
kfree(clips);
|
|
out_err1:
|
|
drm_framebuffer_put(fb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_fb_release - remove and free the FBs on this file
|
|
* @priv: drm file for the ioctl
|
|
*
|
|
* Destroy all the FBs associated with @filp.
|
|
*
|
|
* Called by the user via ioctl.
|
|
*
|
|
* Returns:
|
|
* Zero on success, negative errno on failure.
|
|
*/
|
|
void drm_fb_release(struct drm_file *priv)
|
|
{
|
|
struct drm_framebuffer *fb, *tfb;
|
|
struct drm_mode_rmfb_work arg;
|
|
|
|
INIT_LIST_HEAD(&arg.fbs);
|
|
|
|
/*
|
|
* When the file gets released that means no one else can access the fb
|
|
* list any more, so no need to grab fpriv->fbs_lock. And we need to
|
|
* avoid upsetting lockdep since the universal cursor code adds a
|
|
* framebuffer while holding mutex locks.
|
|
*
|
|
* Note that a real deadlock between fpriv->fbs_lock and the modeset
|
|
* locks is impossible here since no one else but this function can get
|
|
* at it any more.
|
|
*/
|
|
list_for_each_entry_safe(fb, tfb, &priv->fbs, filp_head) {
|
|
if (drm_framebuffer_read_refcount(fb) > 1) {
|
|
list_move_tail(&fb->filp_head, &arg.fbs);
|
|
} else {
|
|
list_del_init(&fb->filp_head);
|
|
|
|
/* This drops the fpriv->fbs reference. */
|
|
drm_framebuffer_put(fb);
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&arg.fbs)) {
|
|
INIT_WORK_ONSTACK(&arg.work, drm_mode_rmfb_work_fn);
|
|
|
|
schedule_work(&arg.work);
|
|
flush_work(&arg.work);
|
|
destroy_work_on_stack(&arg.work);
|
|
}
|
|
}
|
|
|
|
void drm_framebuffer_free(struct kref *kref)
|
|
{
|
|
struct drm_framebuffer *fb =
|
|
container_of(kref, struct drm_framebuffer, base.refcount);
|
|
struct drm_device *dev = fb->dev;
|
|
|
|
/*
|
|
* The lookup idr holds a weak reference, which has not necessarily been
|
|
* removed at this point. Check for that.
|
|
*/
|
|
drm_mode_object_unregister(dev, &fb->base);
|
|
|
|
fb->funcs->destroy(fb);
|
|
}
|
|
|
|
/**
|
|
* drm_framebuffer_init - initialize a framebuffer
|
|
* @dev: DRM device
|
|
* @fb: framebuffer to be initialized
|
|
* @funcs: ... with these functions
|
|
*
|
|
* Allocates an ID for the framebuffer's parent mode object, sets its mode
|
|
* functions & device file and adds it to the master fd list.
|
|
*
|
|
* IMPORTANT:
|
|
* This functions publishes the fb and makes it available for concurrent access
|
|
* by other users. Which means by this point the fb _must_ be fully set up -
|
|
* since all the fb attributes are invariant over its lifetime, no further
|
|
* locking but only correct reference counting is required.
|
|
*
|
|
* Returns:
|
|
* Zero on success, error code on failure.
|
|
*/
|
|
int drm_framebuffer_init(struct drm_device *dev, struct drm_framebuffer *fb,
|
|
const struct drm_framebuffer_funcs *funcs)
|
|
{
|
|
int ret;
|
|
|
|
if (WARN_ON_ONCE(fb->dev != dev || !fb->format))
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&fb->filp_head);
|
|
|
|
fb->funcs = funcs;
|
|
|
|
ret = __drm_mode_object_add(dev, &fb->base, DRM_MODE_OBJECT_FB,
|
|
false, drm_framebuffer_free);
|
|
if (ret)
|
|
goto out;
|
|
|
|
mutex_lock(&dev->mode_config.fb_lock);
|
|
dev->mode_config.num_fb++;
|
|
list_add(&fb->head, &dev->mode_config.fb_list);
|
|
mutex_unlock(&dev->mode_config.fb_lock);
|
|
|
|
drm_mode_object_register(dev, &fb->base);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_init);
|
|
|
|
/**
|
|
* drm_framebuffer_lookup - look up a drm framebuffer and grab a reference
|
|
* @dev: drm device
|
|
* @id: id of the fb object
|
|
*
|
|
* If successful, this grabs an additional reference to the framebuffer -
|
|
* callers need to make sure to eventually unreference the returned framebuffer
|
|
* again, using drm_framebuffer_put().
|
|
*/
|
|
struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
|
|
uint32_t id)
|
|
{
|
|
struct drm_mode_object *obj;
|
|
struct drm_framebuffer *fb = NULL;
|
|
|
|
obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_FB);
|
|
if (obj)
|
|
fb = obj_to_fb(obj);
|
|
return fb;
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_lookup);
|
|
|
|
/**
|
|
* drm_framebuffer_unregister_private - unregister a private fb from the lookup idr
|
|
* @fb: fb to unregister
|
|
*
|
|
* Drivers need to call this when cleaning up driver-private framebuffers, e.g.
|
|
* those used for fbdev. Note that the caller must hold a reference of it's own,
|
|
* i.e. the object may not be destroyed through this call (since it'll lead to a
|
|
* locking inversion).
|
|
*
|
|
* NOTE: This function is deprecated. For driver-private framebuffers it is not
|
|
* recommended to embed a framebuffer struct info fbdev struct, instead, a
|
|
* framebuffer pointer is preferred and drm_framebuffer_put() should be called
|
|
* when the framebuffer is to be cleaned up.
|
|
*/
|
|
void drm_framebuffer_unregister_private(struct drm_framebuffer *fb)
|
|
{
|
|
struct drm_device *dev;
|
|
|
|
if (!fb)
|
|
return;
|
|
|
|
dev = fb->dev;
|
|
|
|
/* Mark fb as reaped and drop idr ref. */
|
|
drm_mode_object_unregister(dev, &fb->base);
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_unregister_private);
|
|
|
|
/**
|
|
* drm_framebuffer_cleanup - remove a framebuffer object
|
|
* @fb: framebuffer to remove
|
|
*
|
|
* Cleanup framebuffer. This function is intended to be used from the drivers
|
|
* &drm_framebuffer_funcs.destroy callback. It can also be used to clean up
|
|
* driver private framebuffers embedded into a larger structure.
|
|
*
|
|
* Note that this function does not remove the fb from active usage - if it is
|
|
* still used anywhere, hilarity can ensue since userspace could call getfb on
|
|
* the id and get back -EINVAL. Obviously no concern at driver unload time.
|
|
*
|
|
* Also, the framebuffer will not be removed from the lookup idr - for
|
|
* user-created framebuffers this will happen in in the rmfb ioctl. For
|
|
* driver-private objects (e.g. for fbdev) drivers need to explicitly call
|
|
* drm_framebuffer_unregister_private.
|
|
*/
|
|
void drm_framebuffer_cleanup(struct drm_framebuffer *fb)
|
|
{
|
|
struct drm_device *dev = fb->dev;
|
|
|
|
mutex_lock(&dev->mode_config.fb_lock);
|
|
list_del(&fb->head);
|
|
dev->mode_config.num_fb--;
|
|
mutex_unlock(&dev->mode_config.fb_lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_cleanup);
|
|
|
|
static int atomic_remove_fb(struct drm_framebuffer *fb)
|
|
{
|
|
struct drm_modeset_acquire_ctx ctx;
|
|
struct drm_device *dev = fb->dev;
|
|
struct drm_atomic_state *state;
|
|
struct drm_plane *plane;
|
|
struct drm_connector *conn;
|
|
struct drm_connector_state *conn_state;
|
|
int i, ret = 0;
|
|
unsigned plane_mask;
|
|
|
|
state = drm_atomic_state_alloc(dev);
|
|
if (!state)
|
|
return -ENOMEM;
|
|
|
|
drm_modeset_acquire_init(&ctx, 0);
|
|
state->acquire_ctx = &ctx;
|
|
|
|
retry:
|
|
plane_mask = 0;
|
|
ret = drm_modeset_lock_all_ctx(dev, &ctx);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
drm_for_each_plane(plane, dev) {
|
|
struct drm_plane_state *plane_state;
|
|
|
|
if (plane->state->fb != fb)
|
|
continue;
|
|
|
|
plane_state = drm_atomic_get_plane_state(state, plane);
|
|
if (IS_ERR(plane_state)) {
|
|
ret = PTR_ERR(plane_state);
|
|
goto unlock;
|
|
}
|
|
|
|
if (plane_state->crtc->primary == plane) {
|
|
struct drm_crtc_state *crtc_state;
|
|
|
|
crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
|
|
|
|
ret = drm_atomic_add_affected_connectors(state, plane_state->crtc);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
crtc_state->active = false;
|
|
ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
|
|
drm_atomic_set_fb_for_plane(plane_state, NULL);
|
|
ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
|
|
if (ret)
|
|
goto unlock;
|
|
|
|
plane_mask |= BIT(drm_plane_index(plane));
|
|
|
|
plane->old_fb = plane->fb;
|
|
}
|
|
|
|
for_each_new_connector_in_state(state, conn, conn_state, i) {
|
|
ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
|
|
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
|
|
if (plane_mask)
|
|
ret = drm_atomic_commit(state);
|
|
|
|
unlock:
|
|
if (plane_mask)
|
|
drm_atomic_clean_old_fb(dev, plane_mask, ret);
|
|
|
|
if (ret == -EDEADLK) {
|
|
drm_atomic_state_clear(state);
|
|
drm_modeset_backoff(&ctx);
|
|
goto retry;
|
|
}
|
|
|
|
drm_atomic_state_put(state);
|
|
|
|
drm_modeset_drop_locks(&ctx);
|
|
drm_modeset_acquire_fini(&ctx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void legacy_remove_fb(struct drm_framebuffer *fb)
|
|
{
|
|
struct drm_device *dev = fb->dev;
|
|
struct drm_crtc *crtc;
|
|
struct drm_plane *plane;
|
|
|
|
drm_modeset_lock_all(dev);
|
|
/* remove from any CRTC */
|
|
drm_for_each_crtc(crtc, dev) {
|
|
if (crtc->primary->fb == fb) {
|
|
/* should turn off the crtc */
|
|
if (drm_crtc_force_disable(crtc))
|
|
DRM_ERROR("failed to reset crtc %p when fb was deleted\n", crtc);
|
|
}
|
|
}
|
|
|
|
drm_for_each_plane(plane, dev) {
|
|
if (plane->fb == fb)
|
|
drm_plane_force_disable(plane);
|
|
}
|
|
drm_modeset_unlock_all(dev);
|
|
}
|
|
|
|
/**
|
|
* drm_framebuffer_remove - remove and unreference a framebuffer object
|
|
* @fb: framebuffer to remove
|
|
*
|
|
* Scans all the CRTCs and planes in @dev's mode_config. If they're
|
|
* using @fb, removes it, setting it to NULL. Then drops the reference to the
|
|
* passed-in framebuffer. Might take the modeset locks.
|
|
*
|
|
* Note that this function optimizes the cleanup away if the caller holds the
|
|
* last reference to the framebuffer. It is also guaranteed to not take the
|
|
* modeset locks in this case.
|
|
*/
|
|
void drm_framebuffer_remove(struct drm_framebuffer *fb)
|
|
{
|
|
struct drm_device *dev;
|
|
|
|
if (!fb)
|
|
return;
|
|
|
|
dev = fb->dev;
|
|
|
|
WARN_ON(!list_empty(&fb->filp_head));
|
|
|
|
/*
|
|
* drm ABI mandates that we remove any deleted framebuffers from active
|
|
* useage. But since most sane clients only remove framebuffers they no
|
|
* longer need, try to optimize this away.
|
|
*
|
|
* Since we're holding a reference ourselves, observing a refcount of 1
|
|
* means that we're the last holder and can skip it. Also, the refcount
|
|
* can never increase from 1 again, so we don't need any barriers or
|
|
* locks.
|
|
*
|
|
* Note that userspace could try to race with use and instate a new
|
|
* usage _after_ we've cleared all current ones. End result will be an
|
|
* in-use fb with fb-id == 0. Userspace is allowed to shoot its own foot
|
|
* in this manner.
|
|
*/
|
|
if (drm_framebuffer_read_refcount(fb) > 1) {
|
|
if (drm_drv_uses_atomic_modeset(dev)) {
|
|
int ret = atomic_remove_fb(fb);
|
|
WARN(ret, "atomic remove_fb failed with %i\n", ret);
|
|
} else
|
|
legacy_remove_fb(fb);
|
|
}
|
|
|
|
drm_framebuffer_put(fb);
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_remove);
|
|
|
|
/**
|
|
* drm_framebuffer_plane_width - width of the plane given the first plane
|
|
* @width: width of the first plane
|
|
* @fb: the framebuffer
|
|
* @plane: plane index
|
|
*
|
|
* Returns:
|
|
* The width of @plane, given that the width of the first plane is @width.
|
|
*/
|
|
int drm_framebuffer_plane_width(int width,
|
|
const struct drm_framebuffer *fb, int plane)
|
|
{
|
|
if (plane >= fb->format->num_planes)
|
|
return 0;
|
|
|
|
return fb_plane_width(width, fb->format, plane);
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_plane_width);
|
|
|
|
/**
|
|
* drm_framebuffer_plane_height - height of the plane given the first plane
|
|
* @height: height of the first plane
|
|
* @fb: the framebuffer
|
|
* @plane: plane index
|
|
*
|
|
* Returns:
|
|
* The height of @plane, given that the height of the first plane is @height.
|
|
*/
|
|
int drm_framebuffer_plane_height(int height,
|
|
const struct drm_framebuffer *fb, int plane)
|
|
{
|
|
if (plane >= fb->format->num_planes)
|
|
return 0;
|
|
|
|
return fb_plane_height(height, fb->format, plane);
|
|
}
|
|
EXPORT_SYMBOL(drm_framebuffer_plane_height);
|