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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/export.h>#include <linux/fb.h>#include <linux/vmalloc.h>
#include <drm/clients/drm_fbdev_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fbdev_dma.h>#include <drm/drm_fb_dma_helper.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem_dma_helper.h>#include <drm/drm_print.h>
/* * struct fb_ops */
static int drm_fbdev_dma_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_dma_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;}
static int drm_fbdev_dma_fb_mmap(struct fb_info *info, struct vm_area_struct *vma){ struct drm_fb_helper *fb_helper = info->par;
return drm_gem_prime_mmap(fb_helper->buffer->gem, vma);}
static void drm_fbdev_dma_fb_destroy(struct fb_info *info){ struct drm_fb_helper *fb_helper = info->par;
if (!fb_helper->dev) return;
if (info->fbdefio) fb_deferred_io_cleanup(info); drm_fb_helper_fini(fb_helper);
drm_client_buffer_vunmap(fb_helper->buffer); drm_client_buffer_delete(fb_helper->buffer); drm_client_release(&fb_helper->client);}
static const struct fb_ops drm_fbdev_dma_fb_ops = { .owner = THIS_MODULE, .fb_open = drm_fbdev_dma_fb_open, .fb_release = drm_fbdev_dma_fb_release, __FB_DEFAULT_DMAMEM_OPS_RDWR, DRM_FB_HELPER_DEFAULT_OPS, __FB_DEFAULT_DMAMEM_OPS_DRAW, .fb_mmap = drm_fbdev_dma_fb_mmap, .fb_destroy = drm_fbdev_dma_fb_destroy,};
FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(drm_fbdev_dma_shadowed, drm_fb_helper_damage_range, drm_fb_helper_damage_area);
static void drm_fbdev_dma_shadowed_fb_destroy(struct fb_info *info){ struct drm_fb_helper *fb_helper = info->par; void *shadow = info->screen_buffer;
if (!fb_helper->dev) return;
if (info->fbdefio) fb_deferred_io_cleanup(info); drm_fb_helper_fini(fb_helper); vfree(shadow);
drm_client_buffer_vunmap(fb_helper->buffer); drm_client_buffer_delete(fb_helper->buffer); drm_client_release(&fb_helper->client);}
static const struct fb_ops drm_fbdev_dma_shadowed_fb_ops = { .owner = THIS_MODULE, .fb_open = drm_fbdev_dma_fb_open, .fb_release = drm_fbdev_dma_fb_release, FB_DEFAULT_DEFERRED_OPS(drm_fbdev_dma_shadowed), DRM_FB_HELPER_DEFAULT_OPS, .fb_destroy = drm_fbdev_dma_shadowed_fb_destroy,};
/* * struct drm_fb_helper */
static void drm_fbdev_dma_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_dma_damage_blit(struct drm_fb_helper *fb_helper, struct drm_clip_rect *clip){ struct drm_client_buffer *buffer = fb_helper->buffer; struct iosys_map dst;
/* * 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);
dst = buffer->map; drm_fbdev_dma_damage_blit_real(fb_helper, clip, &dst);
mutex_unlock(&fb_helper->lock);
return 0;}static int drm_fbdev_dma_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;
if (helper->fb->funcs->dirty) { ret = drm_fbdev_dma_damage_blit(helper, clip); if (drm_WARN_ONCE(dev, ret, "Damage blitter failed: ret=%d\n", ret)) return ret;
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_dma_helper_funcs = { .fb_dirty = drm_fbdev_dma_helper_fb_dirty,};
/* * struct drm_fb_helper */
static int drm_fbdev_dma_driver_fbdev_probe_tail(struct drm_fb_helper *fb_helper, struct drm_fb_helper_surface_size *sizes){ struct drm_device *dev = fb_helper->dev; struct drm_client_buffer *buffer = fb_helper->buffer; struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(buffer->gem); struct drm_framebuffer *fb = fb_helper->fb; struct fb_info *info = fb_helper->info; struct iosys_map map = buffer->map;
info->fbops = &drm_fbdev_dma_fb_ops;
/* screen */ info->flags |= FBINFO_VIRTFB; /* system memory */ if (dma_obj->map_noncoherent) info->flags |= FBINFO_READS_FAST; /* signal caching */ info->screen_size = sizes->surface_height * fb->pitches[0]; info->screen_buffer = map.vaddr; if (!(info->flags & FBINFO_HIDE_SMEM_START)) { if (!drm_WARN_ON(dev, is_vmalloc_addr(info->screen_buffer))) info->fix.smem_start = page_to_phys(virt_to_page(info->screen_buffer)); } info->fix.smem_len = info->screen_size;
return 0;}
static int drm_fbdev_dma_driver_fbdev_probe_tail_shadowed(struct drm_fb_helper *fb_helper, struct drm_fb_helper_surface_size *sizes){ struct drm_client_buffer *buffer = fb_helper->buffer; struct fb_info *info = fb_helper->info; size_t screen_size = buffer->gem->size; void *screen_buffer; int ret;
/* * Deferred I/O requires struct page for framebuffer memory, * which is not guaranteed for all DMA ranges. We thus create * a shadow buffer in system memory. */ screen_buffer = vzalloc(screen_size); if (!screen_buffer) return -ENOMEM;
info->fbops = &drm_fbdev_dma_shadowed_fb_ops;
/* screen */ info->flags |= FBINFO_VIRTFB; /* system memory */ info->flags |= FBINFO_READS_FAST; /* signal caching */ info->screen_buffer = screen_buffer; info->fix.smem_len = screen_size;
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); return ret;}
int drm_fbdev_dma_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; struct drm_framebuffer *fb; u32 format; struct iosys_map map; 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 = buffer->fb;
ret = drm_client_buffer_vmap(buffer, &map); if (ret) { goto err_drm_client_buffer_delete; } else if (drm_WARN_ON(dev, map.is_iomem)) { ret = -ENODEV; /* I/O memory not supported; use generic emulation */ goto err_drm_client_buffer_delete; }
fb_helper->funcs = &drm_fbdev_dma_helper_funcs; fb_helper->buffer = buffer; fb_helper->fb = fb;
drm_fb_helper_fill_info(info, fb_helper, sizes);
if (fb->funcs->dirty) ret = drm_fbdev_dma_driver_fbdev_probe_tail_shadowed(fb_helper, sizes); else ret = drm_fbdev_dma_driver_fbdev_probe_tail(fb_helper, sizes); if (ret) goto err_drm_client_buffer_vunmap;
return 0;
err_drm_client_buffer_vunmap: fb_helper->fb = NULL; fb_helper->buffer = NULL; drm_client_buffer_vunmap(buffer);err_drm_client_buffer_delete: drm_client_buffer_delete(buffer); return ret;}EXPORT_SYMBOL(drm_fbdev_dma_driver_fbdev_probe);