diff options
Diffstat (limited to 'drivers/gpu/drm/udl/udl_fb.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_fb.c | 611 |
1 files changed, 611 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c new file mode 100644 index 000000000000..4d9c3a5d8a45 --- /dev/null +++ b/drivers/gpu/drm/udl/udl_fb.c @@ -0,0 +1,611 @@ +/* + * Copyright (C) 2012 Red Hat + * + * based in parts on udlfb.c: + * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> + * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> + * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file COPYING in the main directory of this archive for + * more details. + */ +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/fb.h> + +#include "drmP.h" +#include "drm.h" +#include "drm_crtc.h" +#include "drm_crtc_helper.h" +#include "udl_drv.h" + +#include "drm_fb_helper.h" + +#define DL_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */ + +static int fb_defio = 1; /* Optionally enable experimental fb_defio mmap support */ +static int fb_bpp = 16; + +module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); +module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); + +struct udl_fbdev { + struct drm_fb_helper helper; + struct udl_framebuffer ufb; + struct list_head fbdev_list; + int fb_count; +}; + +#define DL_ALIGN_UP(x, a) ALIGN(x, a) +#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a) + +/** Read the red component (0..255) of a 32 bpp colour. */ +#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF) + +/** Read the green component (0..255) of a 32 bpp colour. */ +#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF) + +/** Read the blue component (0..255) of a 32 bpp colour. */ +#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF) + +/** Return red/green component of a 16 bpp colour number. */ +#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF) + +/** Return green/blue component of a 16 bpp colour number. */ +#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF) + +/** Return 8 bpp colour number from red, green and blue components. */ +#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF) + +#if 0 +static uint8_t rgb8(uint32_t col) +{ + uint8_t red = DLO_RGB_GETRED(col); + uint8_t grn = DLO_RGB_GETGRN(col); + uint8_t blu = DLO_RGB_GETBLU(col); + + return DLO_RGB8(red, grn, blu); +} + +static uint16_t rgb16(uint32_t col) +{ + uint8_t red = DLO_RGB_GETRED(col); + uint8_t grn = DLO_RGB_GETGRN(col); + uint8_t blu = DLO_RGB_GETBLU(col); + + return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu); +} +#endif + +/* + * NOTE: fb_defio.c is holding info->fbdefio.mutex + * Touching ANY framebuffer memory that triggers a page fault + * in fb_defio will cause a deadlock, when it also tries to + * grab the same mutex. + */ +static void udlfb_dpy_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + struct page *cur; + struct fb_deferred_io *fbdefio = info->fbdefio; + struct udl_fbdev *ufbdev = info->par; + struct drm_device *dev = ufbdev->ufb.base.dev; + struct udl_device *udl = dev->dev_private; + struct urb *urb; + char *cmd; + cycles_t start_cycles, end_cycles; + int bytes_sent = 0; + int bytes_identical = 0; + int bytes_rendered = 0; + + if (!fb_defio) + return; + + start_cycles = get_cycles(); + + urb = udl_get_urb(dev); + if (!urb) + return; + + cmd = urb->transfer_buffer; + + /* walk the written page list and render each to device */ + list_for_each_entry(cur, &fbdefio->pagelist, lru) { + + if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8), + &urb, (char *) info->fix.smem_start, + &cmd, cur->index << PAGE_SHIFT, + PAGE_SIZE, &bytes_identical, &bytes_sent)) + goto error; + bytes_rendered += PAGE_SIZE; + } + + if (cmd > (char *) urb->transfer_buffer) { + /* Send partial buffer remaining before exiting */ + int len = cmd - (char *) urb->transfer_buffer; + udl_submit_urb(dev, urb, len); + bytes_sent += len; + } else + udl_urb_completion(urb); + +error: + atomic_add(bytes_sent, &udl->bytes_sent); + atomic_add(bytes_identical, &udl->bytes_identical); + atomic_add(bytes_rendered, &udl->bytes_rendered); + end_cycles = get_cycles(); + atomic_add(((unsigned int) ((end_cycles - start_cycles) + >> 10)), /* Kcycles */ + &udl->cpu_kcycles_used); +} + +int udl_handle_damage(struct udl_framebuffer *fb, int x, int y, + int width, int height) +{ + struct drm_device *dev = fb->base.dev; + struct udl_device *udl = dev->dev_private; + int i, ret; + char *cmd; + cycles_t start_cycles, end_cycles; + int bytes_sent = 0; + int bytes_identical = 0; + struct urb *urb; + int aligned_x; + int bpp = (fb->base.bits_per_pixel / 8); + + if (!fb->active_16) + return 0; + + if (!fb->obj->vmapping) + udl_gem_vmap(fb->obj); + + start_cycles = get_cycles(); + + aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); + width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); + x = aligned_x; + + if ((width <= 0) || + (x + width > fb->base.width) || + (y + height > fb->base.height)) + return -EINVAL; + + urb = udl_get_urb(dev); + if (!urb) + return 0; + cmd = urb->transfer_buffer; + + for (i = y; i < y + height ; i++) { + const int line_offset = fb->base.pitches[0] * i; + const int byte_offset = line_offset + (x * bpp); + + if (udl_render_hline(dev, bpp, &urb, + (char *) fb->obj->vmapping, + &cmd, byte_offset, width * bpp, + &bytes_identical, &bytes_sent)) + goto error; + } + + if (cmd > (char *) urb->transfer_buffer) { + /* Send partial buffer remaining before exiting */ + int len = cmd - (char *) urb->transfer_buffer; + ret = udl_submit_urb(dev, urb, len); + bytes_sent += len; + } else + udl_urb_completion(urb); + +error: + atomic_add(bytes_sent, &udl->bytes_sent); + atomic_add(bytes_identical, &udl->bytes_identical); + atomic_add(width*height*bpp, &udl->bytes_rendered); + end_cycles = get_cycles(); + atomic_add(((unsigned int) ((end_cycles - start_cycles) + >> 10)), /* Kcycles */ + &udl->cpu_kcycles_used); + + return 0; +} + +static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + unsigned long start = vma->vm_start; + unsigned long size = vma->vm_end - vma->vm_start; + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long page, pos; + + if (offset + size > info->fix.smem_len) + return -EINVAL; + + pos = (unsigned long)info->fix.smem_start + offset; + + pr_notice("mmap() framebuffer addr:%lu size:%lu\n", + pos, size); + + while (size > 0) { + page = vmalloc_to_pfn((void *)pos); + if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) + return -EAGAIN; + + start += PAGE_SIZE; + pos += PAGE_SIZE; + if (size > PAGE_SIZE) + size -= PAGE_SIZE; + else + size = 0; + } + + vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */ + return 0; +} + +static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) +{ + struct udl_fbdev *ufbdev = info->par; + + sys_fillrect(info, rect); + + udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width, + rect->height); +} + +static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region) +{ + struct udl_fbdev *ufbdev = info->par; + + sys_copyarea(info, region); + + udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width, + region->height); +} + +static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image) +{ + struct udl_fbdev *ufbdev = info->par; + + sys_imageblit(info, image); + + udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width, + image->height); +} + +/* + * It's common for several clients to have framebuffer open simultaneously. + * e.g. both fbcon and X. Makes things interesting. + * Assumes caller is holding info->lock (for open and release at least) + */ +static int udl_fb_open(struct fb_info *info, int user) +{ + struct udl_fbdev *ufbdev = info->par; + struct drm_device *dev = ufbdev->ufb.base.dev; + struct udl_device *udl = dev->dev_private; + + /* If the USB device is gone, we don't accept new opens */ + if (drm_device_is_unplugged(udl->ddev)) + return -ENODEV; + + ufbdev->fb_count++; + + if (fb_defio && (info->fbdefio == NULL)) { + /* enable defio at last moment if not disabled by client */ + + struct fb_deferred_io *fbdefio; + + fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); + + if (fbdefio) { + fbdefio->delay = DL_DEFIO_WRITE_DELAY; + fbdefio->deferred_io = udlfb_dpy_deferred_io; + } + + info->fbdefio = fbdefio; + fb_deferred_io_init(info); + } + + pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n", + info->node, user, info, ufbdev->fb_count); + + return 0; +} + + +/* + * Assumes caller is holding info->lock mutex (for open and release at least) + */ +static int udl_fb_release(struct fb_info *info, int user) +{ + struct udl_fbdev *ufbdev = info->par; + + ufbdev->fb_count--; + + if ((ufbdev->fb_count == 0) && (info->fbdefio)) { + fb_deferred_io_cleanup(info); + kfree(info->fbdefio); + info->fbdefio = NULL; + info->fbops->fb_mmap = udl_fb_mmap; + } + + pr_warn("released /dev/fb%d user=%d count=%d\n", + info->node, user, ufbdev->fb_count); + + return 0; +} + +static struct fb_ops udlfb_ops = { + .owner = THIS_MODULE, + .fb_check_var = drm_fb_helper_check_var, + .fb_set_par = drm_fb_helper_set_par, + .fb_fillrect = udl_fb_fillrect, + .fb_copyarea = udl_fb_copyarea, + .fb_imageblit = udl_fb_imageblit, + .fb_pan_display = drm_fb_helper_pan_display, + .fb_blank = drm_fb_helper_blank, + .fb_setcmap = drm_fb_helper_setcmap, + .fb_debug_enter = drm_fb_helper_debug_enter, + .fb_debug_leave = drm_fb_helper_debug_leave, + .fb_mmap = udl_fb_mmap, + .fb_open = udl_fb_open, + .fb_release = udl_fb_release, +}; + +void udl_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green, + u16 blue, int regno) +{ +} + +void udl_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green, + u16 *blue, int regno) +{ + *red = 0; + *green = 0; + *blue = 0; +} + +static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb, + struct drm_file *file, + unsigned flags, unsigned color, + struct drm_clip_rect *clips, + unsigned num_clips) +{ + struct udl_framebuffer *ufb = to_udl_fb(fb); + int i; + + if (!ufb->active_16) + return 0; + + for (i = 0; i < num_clips; i++) { + udl_handle_damage(ufb, clips[i].x1, clips[i].y1, + clips[i].x2 - clips[i].x1, + clips[i].y2 - clips[i].y1); + } + return 0; +} + +static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb) +{ + struct udl_framebuffer *ufb = to_udl_fb(fb); + + if (ufb->obj) + drm_gem_object_unreference_unlocked(&ufb->obj->base); + + drm_framebuffer_cleanup(fb); + kfree(ufb); +} + +static const struct drm_framebuffer_funcs udlfb_funcs = { + .destroy = udl_user_framebuffer_destroy, + .dirty = udl_user_framebuffer_dirty, + .create_handle = NULL, +}; + + +static int +udl_framebuffer_init(struct drm_device *dev, + struct udl_framebuffer *ufb, + struct drm_mode_fb_cmd2 *mode_cmd, + struct udl_gem_object *obj) +{ + int ret; + + ufb->obj = obj; + ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs); + drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd); + return ret; +} + + +static int udlfb_create(struct udl_fbdev *ufbdev, + struct drm_fb_helper_surface_size *sizes) +{ + struct drm_device *dev = ufbdev->helper.dev; + struct fb_info *info; + struct device *device = &dev->usbdev->dev; + struct drm_framebuffer *fb; + struct drm_mode_fb_cmd2 mode_cmd; + struct udl_gem_object *obj; + uint32_t size; + int ret = 0; + + if (sizes->surface_bpp == 24) + sizes->surface_bpp = 32; + + mode_cmd.width = sizes->surface_width; + mode_cmd.height = sizes->surface_height; + mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8); + + mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, + sizes->surface_depth); + + size = mode_cmd.pitches[0] * mode_cmd.height; + size = ALIGN(size, PAGE_SIZE); + + obj = udl_gem_alloc_object(dev, size); + if (!obj) + goto out; + + ret = udl_gem_vmap(obj); + if (ret) { + DRM_ERROR("failed to vmap fb\n"); + goto out_gfree; + } + + info = framebuffer_alloc(0, device); + if (!info) { + ret = -ENOMEM; + goto out_gfree; + } + info->par = ufbdev; + + ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj); + if (ret) + goto out_gfree; + + fb = &ufbdev->ufb.base; + + ufbdev->helper.fb = fb; + ufbdev->helper.fbdev = info; + + strcpy(info->fix.id, "udldrmfb"); + + info->screen_base = ufbdev->ufb.obj->vmapping; + info->fix.smem_len = size; + info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping; + + info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT; + info->fbops = &udlfb_ops; + drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth); + drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height); + + ret = fb_alloc_cmap(&info->cmap, 256, 0); + if (ret) { + ret = -ENOMEM; + goto out_gfree; + } + + + DRM_DEBUG_KMS("allocated %dx%d vmal %p\n", + fb->width, fb->height, + ufbdev->ufb.obj->vmapping); + + return ret; +out_gfree: + drm_gem_object_unreference(&ufbdev->ufb.obj->base); +out: + return ret; +} + +static int udl_fb_find_or_create_single(struct drm_fb_helper *helper, + struct drm_fb_helper_surface_size *sizes) +{ + struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper; + int new_fb = 0; + int ret; + + if (!helper->fb) { + ret = udlfb_create(ufbdev, sizes); + if (ret) + return ret; + + new_fb = 1; + } + return new_fb; +} + +static struct drm_fb_helper_funcs udl_fb_helper_funcs = { + .gamma_set = udl_crtc_fb_gamma_set, + .gamma_get = udl_crtc_fb_gamma_get, + .fb_probe = udl_fb_find_or_create_single, +}; + +static void udl_fbdev_destroy(struct drm_device *dev, + struct udl_fbdev *ufbdev) +{ + struct fb_info *info; + if (ufbdev->helper.fbdev) { + info = ufbdev->helper.fbdev; + unregister_framebuffer(info); + if (info->cmap.len) + fb_dealloc_cmap(&info->cmap); + framebuffer_release(info); + } + drm_fb_helper_fini(&ufbdev->helper); + drm_framebuffer_cleanup(&ufbdev->ufb.base); + drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base); +} + +int udl_fbdev_init(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + int bpp_sel = fb_bpp; + struct udl_fbdev *ufbdev; + int ret; + + ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL); + if (!ufbdev) + return -ENOMEM; + + udl->fbdev = ufbdev; + ufbdev->helper.funcs = &udl_fb_helper_funcs; + + ret = drm_fb_helper_init(dev, &ufbdev->helper, + 1, 1); + if (ret) { + kfree(ufbdev); + return ret; + + } + + drm_fb_helper_single_add_all_connectors(&ufbdev->helper); + drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel); + return 0; +} + +void udl_fbdev_cleanup(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + if (!udl->fbdev) + return; + + udl_fbdev_destroy(dev, udl->fbdev); + kfree(udl->fbdev); + udl->fbdev = NULL; +} + +void udl_fbdev_unplug(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + struct udl_fbdev *ufbdev; + if (!udl->fbdev) + return; + + ufbdev = udl->fbdev; + if (ufbdev->helper.fbdev) { + struct fb_info *info; + info = ufbdev->helper.fbdev; + unlink_framebuffer(info); + } +} + +struct drm_framebuffer * +udl_fb_user_fb_create(struct drm_device *dev, + struct drm_file *file, + struct drm_mode_fb_cmd2 *mode_cmd) +{ + struct drm_gem_object *obj; + struct udl_framebuffer *ufb; + int ret; + + obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]); + if (obj == NULL) + return ERR_PTR(-ENOENT); + + ufb = kzalloc(sizeof(*ufb), GFP_KERNEL); + if (ufb == NULL) + return ERR_PTR(-ENOMEM); + + ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj)); + if (ret) { + kfree(ufb); + return ERR_PTR(-EINVAL); + } + return &ufb->base; +} |