mirror of
https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2025-11-03 09:01:40 -05:00
258 lines
6.9 KiB
C
258 lines
6.9 KiB
C
#include <drm_fourcc.h>
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#include <stdlib.h>
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#include <wlr/render/drm_format_set.h>
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#include <wlr/types/wlr_buffer.h>
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#include <wlr/util/addon.h>
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#include <wlr/util/log.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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#include "backend/drm/drm.h"
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#include "backend/drm/fb.h"
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#include "render/pixel_format.h"
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void drm_fb_clear(struct wlr_drm_fb **fb_ptr) {
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if (*fb_ptr == NULL) {
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return;
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}
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struct wlr_drm_fb *fb = *fb_ptr;
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wlr_buffer_unlock(fb->wlr_buf); // may destroy the buffer
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*fb_ptr = NULL;
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}
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struct wlr_drm_fb *drm_fb_lock(struct wlr_drm_fb *fb) {
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wlr_buffer_lock(fb->wlr_buf);
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return fb;
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}
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static void drm_fb_handle_destroy(struct wlr_addon *addon) {
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struct wlr_drm_fb *fb = wl_container_of(addon, fb, addon);
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drm_fb_destroy(fb);
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}
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static const struct wlr_addon_interface fb_addon_impl = {
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.name = "wlr_drm_fb",
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.destroy = drm_fb_handle_destroy,
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};
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static uint32_t get_fb_for_bo(struct wlr_drm_backend *drm,
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struct wlr_dmabuf_attributes *dmabuf, uint32_t handles[static 4]) {
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uint64_t modifiers[4] = {0};
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for (int i = 0; i < dmabuf->n_planes; i++) {
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// KMS requires all BO planes to have the same modifier
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modifiers[i] = dmabuf->modifier;
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}
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uint32_t id = 0;
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if (drm->addfb2_modifiers && dmabuf->modifier != DRM_FORMAT_MOD_INVALID) {
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if (drmModeAddFB2WithModifiers(drm->fd, dmabuf->width, dmabuf->height,
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dmabuf->format, handles, dmabuf->stride, dmabuf->offset,
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modifiers, &id, DRM_MODE_FB_MODIFIERS) != 0) {
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wlr_log_errno(WLR_DEBUG, "drmModeAddFB2WithModifiers failed");
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}
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} else {
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if (dmabuf->modifier != DRM_FORMAT_MOD_INVALID &&
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dmabuf->modifier != DRM_FORMAT_MOD_LINEAR) {
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wlr_log(WLR_ERROR, "Cannot import DRM framebuffer with explicit "
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"modifier 0x%"PRIX64, dmabuf->modifier);
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return 0;
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}
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int ret = drmModeAddFB2(drm->fd, dmabuf->width, dmabuf->height,
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dmabuf->format, handles, dmabuf->stride, dmabuf->offset, &id, 0);
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if (ret != 0 && dmabuf->format == DRM_FORMAT_ARGB8888 &&
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dmabuf->n_planes == 1 && dmabuf->offset[0] == 0) {
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// Some big-endian machines don't support drmModeAddFB2. Try a
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// last-resort fallback for ARGB8888 buffers, like Xorg's
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// modesetting driver does.
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wlr_log(WLR_DEBUG, "drmModeAddFB2 failed (%s), falling back to "
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"legacy drmModeAddFB", strerror(-ret));
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uint32_t depth = 32;
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uint32_t bpp = 32;
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ret = drmModeAddFB(drm->fd, dmabuf->width, dmabuf->height, depth,
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bpp, dmabuf->stride[0], handles[0], &id);
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if (ret != 0) {
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wlr_log_errno(WLR_DEBUG, "drmModeAddFB failed");
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}
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} else if (ret != 0) {
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wlr_log_errno(WLR_DEBUG, "drmModeAddFB2 failed");
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}
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}
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return id;
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}
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static void close_all_bo_handles(struct wlr_drm_backend *drm,
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uint32_t handles[static 4]) {
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for (int i = 0; i < 4; ++i) {
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if (handles[i] == 0) {
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continue;
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}
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// If multiple planes share the same BO handle, avoid double-closing it
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bool already_closed = false;
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for (int j = 0; j < i; ++j) {
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if (handles[i] == handles[j]) {
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already_closed = true;
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break;
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}
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}
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if (already_closed) {
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continue;
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}
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if (drmCloseBufferHandle(drm->fd, handles[i]) != 0) {
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wlr_log_errno(WLR_ERROR, "drmCloseBufferHandle failed");
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}
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}
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}
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static void drm_poisoned_fb_handle_destroy(struct wlr_addon *addon) {
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wlr_addon_finish(addon);
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free(addon);
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}
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static const struct wlr_addon_interface poisoned_fb_addon_impl = {
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.name = "wlr_drm_poisoned_fb",
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.destroy = drm_poisoned_fb_handle_destroy,
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};
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static bool is_buffer_poisoned(struct wlr_drm_backend *drm,
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struct wlr_buffer *buf) {
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return wlr_addon_find(&buf->addons, drm, &poisoned_fb_addon_impl) != NULL;
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}
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/**
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* Mark the buffer as "poisoned", ie. it cannot be imported into KMS. This
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* allows us to avoid repeatedly trying to import it when it's not
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* scanout-capable.
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*/
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static void poison_buffer(struct wlr_drm_backend *drm,
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struct wlr_buffer *buf) {
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struct wlr_addon *addon = calloc(1, sizeof(*addon));
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if (addon == NULL) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return;
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}
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wlr_addon_init(addon, &buf->addons, drm, &poisoned_fb_addon_impl);
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wlr_log(WLR_DEBUG, "Poisoning buffer");
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}
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static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
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struct wlr_buffer *buf, const struct wlr_drm_format_set *formats) {
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struct wlr_dmabuf_attributes attribs;
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if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
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wlr_log(WLR_DEBUG, "Failed to get DMA-BUF from buffer");
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return NULL;
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}
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if (is_buffer_poisoned(drm, buf)) {
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wlr_log(WLR_DEBUG, "Buffer is poisoned");
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return NULL;
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}
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struct wlr_drm_fb *fb = calloc(1, sizeof(*fb));
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if (!fb) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return NULL;
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}
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if (formats && !wlr_drm_format_set_has(formats, attribs.format,
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attribs.modifier)) {
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// The format isn't supported by the plane. Try stripping the alpha
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// channel, if any.
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const struct wlr_pixel_format_info *info =
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drm_get_pixel_format_info(attribs.format);
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if (info != NULL && info->opaque_substitute != DRM_FORMAT_INVALID &&
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wlr_drm_format_set_has(formats, info->opaque_substitute, attribs.modifier)) {
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attribs.format = info->opaque_substitute;
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} else {
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wlr_log(WLR_DEBUG, "Buffer format 0x%"PRIX32" with modifier "
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"0x%"PRIX64" cannot be scanned out",
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attribs.format, attribs.modifier);
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goto error_fb;
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}
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}
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uint32_t handles[4] = {0};
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for (int i = 0; i < attribs.n_planes; ++i) {
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int ret = drmPrimeFDToHandle(drm->fd, attribs.fd[i], &handles[i]);
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if (ret != 0) {
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wlr_log_errno(WLR_DEBUG, "drmPrimeFDToHandle failed");
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goto error_bo_handle;
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}
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}
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fb->id = get_fb_for_bo(drm, &attribs, handles);
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if (!fb->id) {
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wlr_log(WLR_DEBUG, "Failed to import BO in KMS");
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poison_buffer(drm, buf);
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goto error_bo_handle;
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}
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close_all_bo_handles(drm, handles);
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fb->backend = drm;
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fb->wlr_buf = buf;
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wlr_addon_init(&fb->addon, &buf->addons, drm, &fb_addon_impl);
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wl_list_insert(&drm->fbs, &fb->link);
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return fb;
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error_bo_handle:
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close_all_bo_handles(drm, handles);
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error_fb:
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free(fb);
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return NULL;
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}
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void drm_fb_destroy(struct wlr_drm_fb *fb) {
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struct wlr_drm_backend *drm = fb->backend;
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wl_list_remove(&fb->link);
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wlr_addon_finish(&fb->addon);
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int ret = drmModeCloseFB(drm->fd, fb->id);
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if (ret == -EINVAL) {
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ret = drmModeRmFB(drm->fd, fb->id);
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}
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if (ret != 0) {
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wlr_log(WLR_ERROR, "Failed to close FB: %s", strerror(-ret));
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}
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free(fb);
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}
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bool drm_fb_import(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
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struct wlr_buffer *buf, const struct wlr_drm_format_set *formats) {
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struct wlr_drm_fb *fb;
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struct wlr_addon *addon = wlr_addon_find(&buf->addons, drm, &fb_addon_impl);
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if (addon != NULL) {
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fb = wl_container_of(addon, fb, addon);
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} else {
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fb = drm_fb_create(drm, buf, formats);
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if (!fb) {
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return false;
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}
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}
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wlr_buffer_lock(buf);
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drm_fb_move(fb_ptr, &fb);
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return true;
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}
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void drm_fb_move(struct wlr_drm_fb **new, struct wlr_drm_fb **old) {
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drm_fb_clear(new);
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*new = *old;
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*old = NULL;
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}
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void drm_fb_copy(struct wlr_drm_fb **new, struct wlr_drm_fb *old) {
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drm_fb_clear(new);
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if (old != NULL) {
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*new = drm_fb_lock(old);
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}
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}
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