[deliverable/linux.git] / drivers / gpu / drm / udl / udl_fb.c

/*
 * 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 <linux/dma-buf.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include "udl_drv.h"

#include <drm/drm_fb_helper.h>

#define DL_DEFIO_WRITE_DELAY    (HZ/20) /* fb_deferred_io.delay in jiffies */

static int fb_defio = 0;  /* 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,
				     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);
	int x2, y2;
	bool store_for_later = false;
	unsigned long flags;

	if (!fb->active_16)
		return 0;

	if (!fb->obj->vmapping) {
		ret = udl_gem_vmap(fb->obj);
		if (ret == -ENOMEM) {
			DRM_ERROR("failed to vmap fb\n");
			return 0;
		}
		if (!fb->obj->vmapping) {
			DRM_ERROR("failed to vmapping\n");
			return 0;
		}
	}

	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;

	/* if we are in atomic just store the info
	   can't test inside spin lock */
	if (in_atomic())
		store_for_later = true;

	x2 = x + width - 1;
	y2 = y + height - 1;

	spin_lock_irqsave(&fb->dirty_lock, flags);

	if (fb->y1 < y)
		y = fb->y1;
	if (fb->y2 > y2)
		y2 = fb->y2;
	if (fb->x1 < x)
		x = fb->x1;
	if (fb->x2 > x2)
		x2 = fb->x2;

	if (store_for_later) {
		fb->x1 = x;
		fb->x2 = x2;
		fb->y1 = y;
		fb->y2 = y2;
		spin_unlock_irqrestore(&fb->dirty_lock, flags);
		return 0;
	}

	fb->x1 = fb->y1 = INT_MAX;
	fb->x2 = fb->y2 = 0;

	spin_unlock_irqrestore(&fb->dirty_lock, flags);
	start_cycles = get_cycles();

	urb = udl_get_urb(dev);
	if (!urb)
		return 0;
	cmd = urb->transfer_buffer;

	for (i = y; i <= y2 ; i++) {
		const int line_offset = fb->base.pitches[0] * i;
		const int byte_offset = line_offset + (x * bpp);
		const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
		if (udl_render_hline(dev, bpp, &urb,
				     (char *) fb->obj->vmapping,
				     &cmd, byte_offset, dev_byte_offset,
				     (x2 - x + 1) * 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;
	}

	/* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
	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,
};

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;
	int ret = 0;

	if (!ufb->active_16)
		return 0;

	if (ufb->obj->base.import_attach) {
		ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
					       0, ufb->obj->base.size,
					       DMA_FROM_DEVICE);
		if (ret)
			return ret;
	}

	for (i = 0; i < num_clips; i++) {
		ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
				  clips[i].x2 - clips[i].x1,
				  clips[i].y2 - clips[i].y1);
		if (ret)
			break;
	}

	if (ufb->obj->base.import_attach) {
		dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
				       0, ufb->obj->base.size,
				       DMA_FROM_DEVICE);
	}
	return ret;
}

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,
};


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;

	spin_lock_init(&ufb->dirty_lock);
	ufb->obj = obj;
	drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
	ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
	return ret;
}


static int udlfb_create(struct drm_fb_helper *helper,
			struct drm_fb_helper_surface_size *sizes)
{
	struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper;
	struct drm_device *dev = ufbdev->helper.dev;
	struct fb_info *info;
	struct device *device = dev->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 struct drm_fb_helper_funcs udl_fb_helper_funcs = {
	.fb_probe = udlfb_create,
};

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_unregister_private(&ufbdev->ufb.base);
	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);

	/* disable all the possible outputs/crtcs before entering KMS mode */
	drm_helper_disable_unused_functions(dev);

	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;
	uint32_t size;

	obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
	if (obj == NULL)
		return ERR_PTR(-ENOENT);

	size = mode_cmd->pitches[0] * mode_cmd->height;
	size = ALIGN(size, PAGE_SIZE);

	if (size > obj->size) {
		DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
		return ERR_PTR(-ENOMEM);
	}

	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;
}
Commit	Line	Data
5320918b DA	1	/*
	2	* Copyright (C) 2012 Red Hat
	3	*
	4	* based in parts on udlfb.c:
	5	* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
	6	* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
	7	* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License v2. See the file COPYING in the main directory of this archive for
	11	* more details.
	12	*/
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/fb.h>
32ecd242	16	#include <linux/dma-buf.h>
5320918b	17
760285e7 DH	18	#include <drm/drmP.h>
	19	#include <drm/drm_crtc.h>
	20	#include <drm/drm_crtc_helper.h>
5320918b DA	21	#include "udl_drv.h"
5320918b DA	22
760285e7	23	#include <drm/drm_fb_helper.h>
5320918b	24
677d23b7	25	#define DL_DEFIO_WRITE_DELAY (HZ/20) /* fb_deferred_io.delay in jiffies */
5320918b	26
677d23b7	27	static int fb_defio = 0; /* Optionally enable experimental fb_defio mmap support */
5320918b DA	28	static int fb_bpp = 16;
	29
	30	module_param(fb_bpp, int, S_IWUSR \| S_IRUSR \| S_IWGRP \| S_IRGRP);
	31	module_param(fb_defio, int, S_IWUSR \| S_IRUSR \| S_IWGRP \| S_IRGRP);
	32
	33	struct udl_fbdev {
	34	struct drm_fb_helper helper;
	35	struct udl_framebuffer ufb;
	36	struct list_head fbdev_list;
	37	int fb_count;
	38	};
	39
	40	#define DL_ALIGN_UP(x, a) ALIGN(x, a)
	41	#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)
	42
	43	/** Read the red component (0..255) of a 32 bpp colour. */
	44	#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
	45
	46	/** Read the green component (0..255) of a 32 bpp colour. */
	47	#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
	48
	49	/** Read the blue component (0..255) of a 32 bpp colour. */
	50	#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
	51
	52	/** Return red/green component of a 16 bpp colour number. */
	53	#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) \| ((grn) >> 5)) & 0xFF)
	54
	55	/** Return green/blue component of a 16 bpp colour number. */
	56	#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) \| ((blu) >> 3)) & 0xFF)
	57
	58	/** Return 8 bpp colour number from red, green and blue components. */
	59	#define DLO_RGB8(red, grn, blu) ((((red) << 5) \| (((grn) & 3) << 3) \| ((blu) & 7)) & 0xFF)
	60
	61	#if 0
	62	static uint8_t rgb8(uint32_t col)
	63	{
	64	uint8_t red = DLO_RGB_GETRED(col);
	65	uint8_t grn = DLO_RGB_GETGRN(col);
	66	uint8_t blu = DLO_RGB_GETBLU(col);
	67
	68	return DLO_RGB8(red, grn, blu);
	69	}
	70
	71	static uint16_t rgb16(uint32_t col)
	72	{
	73	uint8_t red = DLO_RGB_GETRED(col);
	74	uint8_t grn = DLO_RGB_GETGRN(col);
	75	uint8_t blu = DLO_RGB_GETBLU(col);
	76
	77	return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
	78	}
	79	#endif
	80
	81	/*
	82	* NOTE: fb_defio.c is holding info->fbdefio.mutex
	83	* Touching ANY framebuffer memory that triggers a page fault
	84	* in fb_defio will cause a deadlock, when it also tries to
	85	* grab the same mutex.
	86	*/
	87	static void udlfb_dpy_deferred_io(struct fb_info *info,
	88	struct list_head *pagelist)
	89	{
	90	struct page *cur;
	91	struct fb_deferred_io *fbdefio = info->fbdefio;
92	struct udl_fbdev *ufbdev = info->par;
93	struct drm_device *dev = ufbdev->ufb.base.dev;
94	struct udl_device *udl = dev->dev_private;
95	struct urb *urb;
96	char *cmd;
97	cycles_t start_cycles, end_cycles;
98	int bytes_sent = 0;
99	int bytes_identical = 0;
100	int bytes_rendered = 0;
101
102	if (!fb_defio)
103	return;
104
105	start_cycles = get_cycles();
106
107	urb = udl_get_urb(dev);
108	if (!urb)
109	return;
110
111	cmd = urb->transfer_buffer;
112
113	/* walk the written page list and render each to device */
114	list_for_each_entry(cur, &fbdefio->pagelist, lru) {
115
116	if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8),
3916e1d7 DA	117	&urb, (char *) info->fix.smem_start,
	118	&cmd, cur->index << PAGE_SHIFT,
	119	cur->index << PAGE_SHIFT,
	120	PAGE_SIZE, &bytes_identical, &bytes_sent))
5320918b DA	121	goto error;
	122	bytes_rendered += PAGE_SIZE;
	123	}
	124
	125	if (cmd > (char *) urb->transfer_buffer) {
	126	/* Send partial buffer remaining before exiting */
	127	int len = cmd - (char *) urb->transfer_buffer;
	128	udl_submit_urb(dev, urb, len);
	129	bytes_sent += len;
	130	} else
	131	udl_urb_completion(urb);
	132
	133	error:
	134	atomic_add(bytes_sent, &udl->bytes_sent);
	135	atomic_add(bytes_identical, &udl->bytes_identical);
	136	atomic_add(bytes_rendered, &udl->bytes_rendered);
	137	end_cycles = get_cycles();
	138	atomic_add(((unsigned int) ((end_cycles - start_cycles)
	139	>> 10)), /* Kcycles */
	140	&udl->cpu_kcycles_used);
	141	}
	142
	143	int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
	144	int width, int height)
	145	{
	146	struct drm_device *dev = fb->base.dev;
	147	struct udl_device *udl = dev->dev_private;
	148	int i, ret;
	149	char *cmd;
	150	cycles_t start_cycles, end_cycles;
	151	int bytes_sent = 0;
	152	int bytes_identical = 0;
	153	struct urb *urb;
	154	int aligned_x;
	155	int bpp = (fb->base.bits_per_pixel / 8);
bcb39af4 DA	156	int x2, y2;
	157	bool store_for_later = false;
	158	unsigned long flags;
5320918b DA	159
	160	if (!fb->active_16)
	161	return 0;
	162
e8aa1d1e DA	163	if (!fb->obj->vmapping) {
	164	ret = udl_gem_vmap(fb->obj);
	165	if (ret == -ENOMEM) {
	166	DRM_ERROR("failed to vmap fb\n");
	167	return 0;
	168	}
	169	if (!fb->obj->vmapping) {
	170	DRM_ERROR("failed to vmapping\n");
	171	return 0;
	172	}
	173	}
5320918b	174
5320918b DA	175	aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
	176	width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
	177	x = aligned_x;
	178
	179	if ((width <= 0) \|\|
	180	(x + width > fb->base.width) \|\|
	181	(y + height > fb->base.height))
	182	return -EINVAL;
	183
bcb39af4 DA	184	/* if we are in atomic just store the info
	185	can't test inside spin lock */
	186	if (in_atomic())
	187	store_for_later = true;
	188
	189	x2 = x + width - 1;
	190	y2 = y + height - 1;
	191
	192	spin_lock_irqsave(&fb->dirty_lock, flags);
	193
	194	if (fb->y1 < y)
	195	y = fb->y1;
	196	if (fb->y2 > y2)
	197	y2 = fb->y2;
	198	if (fb->x1 < x)
	199	x = fb->x1;
	200	if (fb->x2 > x2)
	201	x2 = fb->x2;
	202
	203	if (store_for_later) {
	204	fb->x1 = x;
	205	fb->x2 = x2;
	206	fb->y1 = y;
	207	fb->y2 = y2;
	208	spin_unlock_irqrestore(&fb->dirty_lock, flags);
	209	return 0;
	210	}
	211
	212	fb->x1 = fb->y1 = INT_MAX;
	213	fb->x2 = fb->y2 = 0;
	214
	215	spin_unlock_irqrestore(&fb->dirty_lock, flags);
	216	start_cycles = get_cycles();
	217
5320918b DA	218	urb = udl_get_urb(dev);
	219	if (!urb)
	220	return 0;
	221	cmd = urb->transfer_buffer;
	222
bcb39af4	223	for (i = y; i <= y2 ; i++) {
5320918b DA	224	const int line_offset = fb->base.pitches[0] * i;
5320918b DA	225	const int byte_offset = line_offset + (x * bpp);
3916e1d7	226	const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
5320918b DA	227	if (udl_render_hline(dev, bpp, &urb,
5320918b DA	228	(char *) fb->obj->vmapping,
3916e1d7	229	&cmd, byte_offset, dev_byte_offset,
bcb39af4	230	(x2 - x + 1) * bpp,
5320918b DA	231	&bytes_identical, &bytes_sent))
	232	goto error;
	233	}
	234
	235	if (cmd > (char *) urb->transfer_buffer) {
	236	/* Send partial buffer remaining before exiting */
	237	int len = cmd - (char *) urb->transfer_buffer;
	238	ret = udl_submit_urb(dev, urb, len);
	239	bytes_sent += len;
	240	} else
	241	udl_urb_completion(urb);
	242
	243	error:
	244	atomic_add(bytes_sent, &udl->bytes_sent);
	245	atomic_add(bytes_identical, &udl->bytes_identical);
	246	atomic_add(widthheightbpp, &udl->bytes_rendered);
	247	end_cycles = get_cycles();
	248	atomic_add(((unsigned int) ((end_cycles - start_cycles)
	249	>> 10)), /* Kcycles */
	250	&udl->cpu_kcycles_used);
	251
	252	return 0;
	253	}
	254
	255	static int udl_fb_mmap(struct fb_info info, struct vm_area_struct vma)
	256	{
	257	unsigned long start = vma->vm_start;
	258	unsigned long size = vma->vm_end - vma->vm_start;
	259	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	260	unsigned long page, pos;
	261
	262	if (offset + size > info->fix.smem_len)
	263	return -EINVAL;
	264
	265	pos = (unsigned long)info->fix.smem_start + offset;
	266
	267	pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
	268	pos, size);
	269
	270	while (size > 0) {
	271	page = vmalloc_to_pfn((void *)pos);
	272	if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
	273	return -EAGAIN;
	274
	275	start += PAGE_SIZE;
	276	pos += PAGE_SIZE;
	277	if (size > PAGE_SIZE)
	278	size -= PAGE_SIZE;
	279	else
	280	size = 0;
	281	}
	282
314e51b9	283	/* VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP are set by remap_pfn_range() */
5320918b DA	284	return 0;
	285	}
	286
	287	static void udl_fb_fillrect(struct fb_info info, const struct fb_fillrect rect)
	288	{
	289	struct udl_fbdev *ufbdev = info->par;
	290
	291	sys_fillrect(info, rect);
	292
	293	udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
	294	rect->height);
	295	}
	296
	297	static void udl_fb_copyarea(struct fb_info info, const struct fb_copyarea region)
	298	{
	299	struct udl_fbdev *ufbdev = info->par;
	300
	301	sys_copyarea(info, region);
	302
	303	udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
	304	region->height);
	305	}
	306
	307	static void udl_fb_imageblit(struct fb_info info, const struct fb_image image)
	308	{
	309	struct udl_fbdev *ufbdev = info->par;
	310
	311	sys_imageblit(info, image);
	312
	313	udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
	314	image->height);
	315	}
	316
	317	/*
	318	* It's common for several clients to have framebuffer open simultaneously.
	319	* e.g. both fbcon and X. Makes things interesting.
	320	* Assumes caller is holding info->lock (for open and release at least)
	321	*/
	322	static int udl_fb_open(struct fb_info *info, int user)
	323	{
	324	struct udl_fbdev *ufbdev = info->par;
	325	struct drm_device *dev = ufbdev->ufb.base.dev;
	326	struct udl_device *udl = dev->dev_private;
	327
	328	/* If the USB device is gone, we don't accept new opens */
	329	if (drm_device_is_unplugged(udl->ddev))
	330	return -ENODEV;
	331
	332	ufbdev->fb_count++;
	333
	334	if (fb_defio && (info->fbdefio == NULL)) {
	335	/* enable defio at last moment if not disabled by client */
	336
	337	struct fb_deferred_io *fbdefio;
	338
	339	fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
	340
	341	if (fbdefio) {
	342	fbdefio->delay = DL_DEFIO_WRITE_DELAY;
	343	fbdefio->deferred_io = udlfb_dpy_deferred_io;
	344	}
	345
	346	info->fbdefio = fbdefio;
	347	fb_deferred_io_init(info);
348	}
349
350	pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
351	info->node, user, info, ufbdev->fb_count);
352
353	return 0;
354	}
355
356
357	/*
358	* Assumes caller is holding info->lock mutex (for open and release at least)
359	*/
360	static int udl_fb_release(struct fb_info *info, int user)
361	{
362	struct udl_fbdev *ufbdev = info->par;
363
364	ufbdev->fb_count--;
365
366	if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
367	fb_deferred_io_cleanup(info);
368	kfree(info->fbdefio);
369	info->fbdefio = NULL;
370	info->fbops->fb_mmap = udl_fb_mmap;
371	}
372
373	pr_warn("released /dev/fb%d user=%d count=%d\n",
374	info->node, user, ufbdev->fb_count);
375
376	return 0;
377	}
378
379	static struct fb_ops udlfb_ops = {
380	.owner = THIS_MODULE,
381	.fb_check_var = drm_fb_helper_check_var,
382	.fb_set_par = drm_fb_helper_set_par,
383	.fb_fillrect = udl_fb_fillrect,
384	.fb_copyarea = udl_fb_copyarea,
385	.fb_imageblit = udl_fb_imageblit,
386	.fb_pan_display = drm_fb_helper_pan_display,
387	.fb_blank = drm_fb_helper_blank,
388	.fb_setcmap = drm_fb_helper_setcmap,
389	.fb_debug_enter = drm_fb_helper_debug_enter,
390	.fb_debug_leave = drm_fb_helper_debug_leave,
391	.fb_mmap = udl_fb_mmap,
392	.fb_open = udl_fb_open,
393	.fb_release = udl_fb_release,
394	};
395
5320918b DA	396	static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
	397	struct drm_file *file,
	398	unsigned flags, unsigned color,
	399	struct drm_clip_rect *clips,
	400	unsigned num_clips)
	401	{
	402	struct udl_framebuffer *ufb = to_udl_fb(fb);
	403	int i;
32ecd242	404	int ret = 0;
5320918b DA	405
	406	if (!ufb->active_16)
	407	return 0;
	408
32ecd242 DA	409	if (ufb->obj->base.import_attach) {
	410	ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
	411	0, ufb->obj->base.size,
	412	DMA_FROM_DEVICE);
	413	if (ret)
	414	return ret;
	415	}
	416
5320918b	417	for (i = 0; i < num_clips; i++) {
32ecd242	418	ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
5320918b DA	419	clips[i].x2 - clips[i].x1,
5320918b DA	420	clips[i].y2 - clips[i].y1);
32ecd242 DA	421	if (ret)
32ecd242 DA	422	break;
5320918b	423	}
32ecd242 DA	424
	425	if (ufb->obj->base.import_attach) {
	426	dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
	427	0, ufb->obj->base.size,
	428	DMA_FROM_DEVICE);
	429	}
	430	return ret;
5320918b DA	431	}
	432
	433	static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
	434	{
	435	struct udl_framebuffer *ufb = to_udl_fb(fb);
	436
	437	if (ufb->obj)
	438	drm_gem_object_unreference_unlocked(&ufb->obj->base);
	439
	440	drm_framebuffer_cleanup(fb);
	441	kfree(ufb);
	442	}
	443
	444	static const struct drm_framebuffer_funcs udlfb_funcs = {
	445	.destroy = udl_user_framebuffer_destroy,
	446	.dirty = udl_user_framebuffer_dirty,
5320918b DA	447	};
	448
	449
	450	static int
	451	udl_framebuffer_init(struct drm_device *dev,
	452	struct udl_framebuffer *ufb,
	453	struct drm_mode_fb_cmd2 *mode_cmd,
	454	struct udl_gem_object *obj)
	455	{
	456	int ret;
	457
bcb39af4	458	spin_lock_init(&ufb->dirty_lock);
5320918b	459	ufb->obj = obj;
5320918b	460	drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
c7d73f6a	461	ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
5320918b DA	462	return ret;
	463	}
	464
	465
cd5428a5	466	static int udlfb_create(struct drm_fb_helper *helper,
5320918b DA	467	struct drm_fb_helper_surface_size *sizes)
5320918b DA	468	{
cd5428a5	469	struct udl_fbdev ufbdev = (struct udl_fbdev )helper;
5320918b DA	470	struct drm_device *dev = ufbdev->helper.dev;
5320918b DA	471	struct fb_info *info;
33896bf3	472	struct device *device = dev->dev;
5320918b DA	473	struct drm_framebuffer *fb;
	474	struct drm_mode_fb_cmd2 mode_cmd;
	475	struct udl_gem_object *obj;
	476	uint32_t size;
	477	int ret = 0;
	478
	479	if (sizes->surface_bpp == 24)
	480	sizes->surface_bpp = 32;
	481
	482	mode_cmd.width = sizes->surface_width;
	483	mode_cmd.height = sizes->surface_height;
	484	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
	485
	486	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	487	sizes->surface_depth);
	488
	489	size = mode_cmd.pitches[0] * mode_cmd.height;
	490	size = ALIGN(size, PAGE_SIZE);
	491
	492	obj = udl_gem_alloc_object(dev, size);
	493	if (!obj)
	494	goto out;
	495
	496	ret = udl_gem_vmap(obj);
	497	if (ret) {
	498	DRM_ERROR("failed to vmap fb\n");
	499	goto out_gfree;
	500	}
	501
	502	info = framebuffer_alloc(0, device);
	503	if (!info) {
	504	ret = -ENOMEM;
	505	goto out_gfree;
	506	}
	507	info->par = ufbdev;
	508
	509	ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
	510	if (ret)
	511	goto out_gfree;
	512
	513	fb = &ufbdev->ufb.base;
	514
	515	ufbdev->helper.fb = fb;
	516	ufbdev->helper.fbdev = info;
	517
	518	strcpy(info->fix.id, "udldrmfb");
	519
	520	info->screen_base = ufbdev->ufb.obj->vmapping;
	521	info->fix.smem_len = size;
	522	info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
	523
	524	info->flags = FBINFO_DEFAULT \| FBINFO_CAN_FORCE_OUTPUT;
	525	info->fbops = &udlfb_ops;
	526	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
	527	drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
	528
	529	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	530	if (ret) {
	531	ret = -ENOMEM;
	532	goto out_gfree;
	533	}
	534
	535
	536	DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
537	fb->width, fb->height,
538	ufbdev->ufb.obj->vmapping);
539
540	return ret;
541	out_gfree:
542	drm_gem_object_unreference(&ufbdev->ufb.obj->base);
543	out:
544	return ret;
545	}
546
5320918b	547	static struct drm_fb_helper_funcs udl_fb_helper_funcs = {
cd5428a5	548	.fb_probe = udlfb_create,
5320918b DA	549	};
	550
	551	static void udl_fbdev_destroy(struct drm_device *dev,
	552	struct udl_fbdev *ufbdev)
	553	{
	554	struct fb_info *info;
	555	if (ufbdev->helper.fbdev) {
	556	info = ufbdev->helper.fbdev;
	557	unregister_framebuffer(info);
	558	if (info->cmap.len)
	559	fb_dealloc_cmap(&info->cmap);
	560	framebuffer_release(info);
	561	}
	562	drm_fb_helper_fini(&ufbdev->helper);
36206361	563	drm_framebuffer_unregister_private(&ufbdev->ufb.base);
5320918b DA	564	drm_framebuffer_cleanup(&ufbdev->ufb.base);
	565	drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
	566	}
	567
	568	int udl_fbdev_init(struct drm_device *dev)
	569	{
	570	struct udl_device *udl = dev->dev_private;
	571	int bpp_sel = fb_bpp;
	572	struct udl_fbdev *ufbdev;
	573	int ret;
	574
	575	ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
	576	if (!ufbdev)
	577	return -ENOMEM;
	578
	579	udl->fbdev = ufbdev;
	580	ufbdev->helper.funcs = &udl_fb_helper_funcs;
	581
	582	ret = drm_fb_helper_init(dev, &ufbdev->helper,
	583	1, 1);
	584	if (ret) {
	585	kfree(ufbdev);
	586	return ret;
	587
	588	}
	589
	590	drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
76a39dbf DV	591
	592	/* disable all the possible outputs/crtcs before entering KMS mode */
	593	drm_helper_disable_unused_functions(dev);
	594
5320918b DA	595	drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
	596	return 0;
	597	}
	598
	599	void udl_fbdev_cleanup(struct drm_device *dev)
	600	{
	601	struct udl_device *udl = dev->dev_private;
	602	if (!udl->fbdev)
	603	return;
	604
	605	udl_fbdev_destroy(dev, udl->fbdev);
	606	kfree(udl->fbdev);
	607	udl->fbdev = NULL;
	608	}
	609
	610	void udl_fbdev_unplug(struct drm_device *dev)
	611	{
	612	struct udl_device *udl = dev->dev_private;
	613	struct udl_fbdev *ufbdev;
	614	if (!udl->fbdev)
	615	return;
	616
	617	ufbdev = udl->fbdev;
	618	if (ufbdev->helper.fbdev) {
	619	struct fb_info *info;
	620	info = ufbdev->helper.fbdev;
	621	unlink_framebuffer(info);
	622	}
	623	}
	624
	625	struct drm_framebuffer *
	626	udl_fb_user_fb_create(struct drm_device *dev,
	627	struct drm_file *file,
	628	struct drm_mode_fb_cmd2 *mode_cmd)
	629	{
	630	struct drm_gem_object *obj;
	631	struct udl_framebuffer *ufb;
	632	int ret;
96503f59	633	uint32_t size;
5320918b DA	634
	635	obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
	636	if (obj == NULL)
	637	return ERR_PTR(-ENOENT);
	638
96503f59 DA	639	size = mode_cmd->pitches[0] * mode_cmd->height;
	640	size = ALIGN(size, PAGE_SIZE);
	641
	642	if (size > obj->size) {
	643	DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
	644	return ERR_PTR(-ENOMEM);
	645	}
	646
5320918b DA	647	ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
	648	if (ufb == NULL)
	649	return ERR_PTR(-ENOMEM);
	650
	651	ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
	652	if (ret) {
	653	kfree(ufb);
	654	return ERR_PTR(-EINVAL);
	655	}
	656	return &ufb->base;
	657	}