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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/export.h>#include <linux/moduleparam.h>#include <linux/vmalloc.h>
#include <drm/drm_crtc_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fb_helper.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem.h>#include <drm/drm_print.h>
#include <drm/drm_fbdev_ttm.h>
/* @user: 1=userspace, 0=fbcon */static int drm_fbdev_ttm_fb_open(struct fb_info *info, int user){ struct drm_fb_helper *fb_helper = info->par;
/* No need to take a ref for fbcon because it unbinds on unregister */ if (user && !try_module_get(fb_helper->dev->driver->fops->owner)) return -ENODEV;
return 0;}
static int drm_fbdev_ttm_fb_release(struct fb_info *info, int user){ struct drm_fb_helper *fb_helper = info->par;
if (user) module_put(fb_helper->dev->driver->fops->owner);
return 0;}
FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(drm_fbdev_ttm, drm_fb_helper_damage_range, drm_fb_helper_damage_area);
static void drm_fbdev_ttm_fb_destroy(struct fb_info *info){ struct drm_fb_helper *fb_helper = info->par; void *shadow = info->screen_buffer;
if (!fb_helper->dev) return;
fb_deferred_io_cleanup(info); drm_fb_helper_fini(fb_helper); vfree(shadow); drm_client_buffer_delete(fb_helper->buffer);
drm_client_release(&fb_helper->client);}
static const struct fb_ops drm_fbdev_ttm_fb_ops = { .owner = THIS_MODULE, .fb_open = drm_fbdev_ttm_fb_open, .fb_release = drm_fbdev_ttm_fb_release, FB_DEFAULT_DEFERRED_OPS(drm_fbdev_ttm), DRM_FB_HELPER_DEFAULT_OPS, .fb_destroy = drm_fbdev_ttm_fb_destroy,};
static void drm_fbdev_ttm_damage_blit_real(struct drm_fb_helper *fb_helper, struct drm_clip_rect *clip, struct iosys_map *dst){ struct drm_framebuffer *fb = fb_helper->fb; size_t offset = clip->y1 * fb->pitches[0]; size_t len = clip->x2 - clip->x1; unsigned int y; void *src;
switch (drm_format_info_bpp(fb->format, 0)) { case 1: offset += clip->x1 / 8; len = DIV_ROUND_UP(len + clip->x1 % 8, 8); break; case 2: offset += clip->x1 / 4; len = DIV_ROUND_UP(len + clip->x1 % 4, 4); break; case 4: offset += clip->x1 / 2; len = DIV_ROUND_UP(len + clip->x1 % 2, 2); break; default: offset += clip->x1 * fb->format->cpp[0]; len *= fb->format->cpp[0]; break; }
src = fb_helper->info->screen_buffer + offset; iosys_map_incr(dst, offset); /* go to first pixel within clip rect */
for (y = clip->y1; y < clip->y2; y++) { iosys_map_memcpy_to(dst, 0, src, len); iosys_map_incr(dst, fb->pitches[0]); src += fb->pitches[0]; }}
static int drm_fbdev_ttm_damage_blit(struct drm_fb_helper *fb_helper, struct drm_clip_rect *clip){ struct drm_client_buffer *buffer = fb_helper->buffer; struct iosys_map map, dst; int ret;
/* * We have to pin the client buffer to its current location while * flushing the shadow buffer. In the general case, concurrent * modesetting operations could try to move the buffer and would * fail. The modeset has to be serialized by acquiring the reservation * object of the underlying BO here. * * For fbdev emulation, we only have to protect against fbdev modeset * operations. Nothing else will involve the client buffer's BO. So it * is sufficient to acquire struct drm_fb_helper.lock here. */ mutex_lock(&fb_helper->lock);
ret = drm_client_buffer_vmap_local(buffer, &map); if (ret) goto out;
dst = map; drm_fbdev_ttm_damage_blit_real(fb_helper, clip, &dst);
drm_client_buffer_vunmap_local(buffer);
out: mutex_unlock(&fb_helper->lock);
return ret;}
static int drm_fbdev_ttm_helper_fb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip){ struct drm_device *dev = helper->dev; int ret;
/* Call damage handlers only if necessary */ if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2)) return 0;
ret = drm_fbdev_ttm_damage_blit(helper, clip); if (drm_WARN_ONCE(dev, ret, "Damage blitter failed: ret=%d\n", ret)) return ret;
if (helper->fb->funcs->dirty) { ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1); if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret)) return ret; }
return 0;}
static const struct drm_fb_helper_funcs drm_fbdev_ttm_helper_funcs = { .fb_dirty = drm_fbdev_ttm_helper_fb_dirty,};
/* * struct drm_driver */
int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper, struct drm_fb_helper_surface_size *sizes){ struct drm_client_dev *client = &fb_helper->client; struct drm_device *dev = fb_helper->dev; struct fb_info *info = fb_helper->info; struct drm_client_buffer *buffer; size_t screen_size; void *screen_buffer; u32 format; int ret;
drm_dbg_kms(dev, "surface width(%d), height(%d) and bpp(%d)\n", sizes->surface_width, sizes->surface_height, sizes->surface_bpp);
format = drm_driver_legacy_fb_format(dev, sizes->surface_bpp, sizes->surface_depth); buffer = drm_client_buffer_create_dumb(client, sizes->surface_width, sizes->surface_height, format); if (IS_ERR(buffer)) return PTR_ERR(buffer);
fb_helper->funcs = &drm_fbdev_ttm_helper_funcs; fb_helper->buffer = buffer; fb_helper->fb = buffer->fb;
screen_size = buffer->gem->size; screen_buffer = vzalloc(screen_size); if (!screen_buffer) { ret = -ENOMEM; goto err_drm_client_buffer_delete; }
drm_fb_helper_fill_info(info, fb_helper, sizes);
info->fbops = &drm_fbdev_ttm_fb_ops;
/* screen */ info->flags |= FBINFO_VIRTFB | FBINFO_READS_FAST; info->screen_buffer = screen_buffer; info->fix.smem_len = screen_size;
/* deferred I/O */ fb_helper->fbdefio.delay = HZ / 20; fb_helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;
info->fbdefio = &fb_helper->fbdefio; ret = fb_deferred_io_init(info); if (ret) goto err_vfree;
return 0;
err_vfree: vfree(screen_buffer);err_drm_client_buffer_delete: fb_helper->fb = NULL; fb_helper->buffer = NULL; drm_client_buffer_delete(buffer); return ret;}EXPORT_SYMBOL(drm_fbdev_ttm_driver_fbdev_probe);