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path: root/drivers/gpu/drm/udl/udl_fb.c
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Diffstat (limited to 'drivers/gpu/drm/udl/udl_fb.c')
-rw-r--r--drivers/gpu/drm/udl/udl_fb.c611
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 0000000..4d9c3a5
--- /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;
+}
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