drivers/gpu/drm/mgag200/mgag200_fb.c - linux - Git at Google

 /*
  * Copyright 2010 Matt Turner.
  * Copyright 2012 Red Hat
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License version 2. See the file COPYING in the main
  * directory of this archive for more details.
  *
  * Authors: Matthew Garrett
  *          Matt Turner
  *          Dave Airlie
  */
 #include <linux/module.h>
 #include <drm/drmP.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>

 #include "mgag200_drv.h"

 static void mga_dirty_update(struct mga_fbdev *mfbdev,
 			     int x, int y, int width, int height)
 {
 	int i;
 	struct drm_gem_object *obj;
 	struct mgag200_bo *bo;
 	int src_offset, dst_offset;
 	int bpp = mfbdev->mfb.base.format->cpp[0];
 	int ret = -EBUSY;
 	bool unmap = false;
 	bool store_for_later = false;
 	int x2, y2;
 	unsigned long flags;

 	obj = mfbdev->mfb.obj;
 	bo = gem_to_mga_bo(obj);

 	/*
 	 * try and reserve the BO, if we fail with busy
 	 * then the BO is being moved and we should
 	 * store up the damage until later.
 	 */
 	if (drm_can_sleep())
 		ret = mgag200_bo_reserve(bo, true);
 	if (ret) {
 		if (ret != -EBUSY)
 			return;

 		store_for_later = true;
 	}

 	x2 = x + width - 1;
 	y2 = y + height - 1;
 	spin_lock_irqsave(&mfbdev->dirty_lock, flags);

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

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

 	mfbdev->x1 = mfbdev->y1 = INT_MAX;
 	mfbdev->x2 = mfbdev->y2 = 0;
 	spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);

 	if (!bo->kmap.virtual) {
 		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 		if (ret) {
 			DRM_ERROR("failed to kmap fb updates\n");
 			mgag200_bo_unreserve(bo);
 			return;
 		}
 		unmap = true;
 	}
 	for (i = y; i <= y2; i++) {
 		/* assume equal stride for now */
 		src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
 		memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);

 	}
 	if (unmap)
 		ttm_bo_kunmap(&bo->kmap);

 	mgag200_bo_unreserve(bo);
 }

 static void mga_fillrect(struct fb_info *info,
 			 const struct fb_fillrect *rect)
 {
 	struct mga_fbdev *mfbdev = info->par;
 	drm_fb_helper_sys_fillrect(info, rect);
 	mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 			 rect->height);
 }

 static void mga_copyarea(struct fb_info *info,
 			 const struct fb_copyarea *area)
 {
 	struct mga_fbdev *mfbdev = info->par;
 	drm_fb_helper_sys_copyarea(info, area);
 	mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 			 area->height);
 }

 static void mga_imageblit(struct fb_info *info,
 			  const struct fb_image *image)
 {
 	struct mga_fbdev *mfbdev = info->par;
 	drm_fb_helper_sys_imageblit(info, image);
 	mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 			 image->height);
 }


 static struct fb_ops mgag200fb_ops = {
 	.owner = THIS_MODULE,
 	.fb_check_var = drm_fb_helper_check_var,
 	.fb_set_par = drm_fb_helper_set_par,
 	.fb_fillrect = mga_fillrect,
 	.fb_copyarea = mga_copyarea,
 	.fb_imageblit = mga_imageblit,
 	.fb_pan_display = drm_fb_helper_pan_display,
 	.fb_blank = drm_fb_helper_blank,
 	.fb_setcmap = drm_fb_helper_setcmap,
 };

 static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 				   const struct drm_mode_fb_cmd2 *mode_cmd,
 				   struct drm_gem_object **gobj_p)
 {
 	struct drm_device *dev = afbdev->helper.dev;
 	u32 size;
 	struct drm_gem_object *gobj;
 	int ret = 0;

 	size = mode_cmd->pitches[0] * mode_cmd->height;
 	ret = mgag200_gem_create(dev, size, true, &gobj);
 	if (ret)
 		return ret;

 	*gobj_p = gobj;
 	return ret;
 }

 static int mgag200fb_create(struct drm_fb_helper *helper,
 			   struct drm_fb_helper_surface_size *sizes)
 {
 	struct mga_fbdev *mfbdev =
 		container_of(helper, struct mga_fbdev, helper);
 	struct drm_device *dev = mfbdev->helper.dev;
 	struct drm_mode_fb_cmd2 mode_cmd;
 	struct mga_device *mdev = dev->dev_private;
 	struct fb_info *info;
 	struct drm_framebuffer *fb;
 	struct drm_gem_object *gobj = NULL;
 	int ret;
 	void *sysram;
 	int size;

 	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;

 	ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 	if (ret) {
 		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 		return ret;
 	}

 	sysram = vmalloc(size);
 	if (!sysram) {
 		ret = -ENOMEM;
 		goto err_sysram;
 	}

 	info = drm_fb_helper_alloc_fbi(helper);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto err_alloc_fbi;
 	}

 	info->par = mfbdev;

 	ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 	if (ret)
 		goto err_alloc_fbi;

 	mfbdev->sysram = sysram;
 	mfbdev->size = size;

 	fb = &mfbdev->mfb.base;

 	/* setup helper */
 	mfbdev->helper.fb = fb;

 	strcpy(info->fix.id, "mgadrmfb");

 	info->fbops = &mgag200fb_ops;

 	/* setup aperture base/size for vesafb takeover */
 	info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 	info->apertures->ranges[0].size = mdev->mc.vram_size;

 	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 	drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 			       sizes->fb_height);

 	info->screen_base = sysram;
 	info->screen_size = size;
 	info->pixmap.flags = FB_PIXMAP_SYSTEM;

 	DRM_DEBUG_KMS("allocated %dx%d\n",
 		      fb->width, fb->height);

 	return 0;

 err_alloc_fbi:
 	vfree(sysram);
 err_sysram:
 	drm_gem_object_put_unlocked(gobj);

 	return ret;
 }

 static int mga_fbdev_destroy(struct drm_device *dev,
 				struct mga_fbdev *mfbdev)
 {
 	struct mga_framebuffer *mfb = &mfbdev->mfb;

 	drm_fb_helper_unregister_fbi(&mfbdev->helper);

 	if (mfb->obj) {
 		drm_gem_object_put_unlocked(mfb->obj);
 		mfb->obj = NULL;
 	}
 	drm_fb_helper_fini(&mfbdev->helper);
 	vfree(mfbdev->sysram);
 	drm_framebuffer_unregister_private(&mfb->base);
 	drm_framebuffer_cleanup(&mfb->base);

 	return 0;
 }

 static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 	.fb_probe = mgag200fb_create,
 };

 int mgag200_fbdev_init(struct mga_device *mdev)
 {
 	struct mga_fbdev *mfbdev;
 	int ret;
 	int bpp_sel = 32;

 	/* prefer 16bpp on low end gpus with limited VRAM */
 	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 		bpp_sel = 16;

 	mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 	if (!mfbdev)
 		return -ENOMEM;

 	mdev->mfbdev = mfbdev;
 	spin_lock_init(&mfbdev->dirty_lock);

 	drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);

 	ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 				 MGAG200FB_CONN_LIMIT);
 	if (ret)
 		goto err_fb_helper;

 	ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 	if (ret)
 		goto err_fb_setup;

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

 	ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
 	if (ret)
 		goto err_fb_setup;

 	return 0;

 err_fb_setup:
 	drm_fb_helper_fini(&mfbdev->helper);
 err_fb_helper:
 	mdev->mfbdev = NULL;

 	return ret;
 }

 void mgag200_fbdev_fini(struct mga_device *mdev)
 {
 	if (!mdev->mfbdev)
 		return;

 	mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 }
	/*
	* Copyright 2010 Matt Turner.
	* Copyright 2012 Red Hat
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License version 2. See the file COPYING in the main
	* directory of this archive for more details.
	*
	* Authors: Matthew Garrett
	* Matt Turner
	* Dave Airlie
	*/
	#include <linux/module.h>
	#include <drm/drmP.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_crtc_helper.h>

	#include "mgag200_drv.h"

	static void mga_dirty_update(struct mga_fbdev *mfbdev,
	int x, int y, int width, int height)
	{
	int i;
	struct drm_gem_object *obj;
	struct mgag200_bo *bo;
	int src_offset, dst_offset;
	int bpp = mfbdev->mfb.base.format->cpp[0];
	int ret = -EBUSY;
	bool unmap = false;
	bool store_for_later = false;
	int x2, y2;
	unsigned long flags;

	obj = mfbdev->mfb.obj;
	bo = gem_to_mga_bo(obj);

	/*
	* try and reserve the BO, if we fail with busy
	* then the BO is being moved and we should
	* store up the damage until later.
	*/
	if (drm_can_sleep())
	ret = mgag200_bo_reserve(bo, true);
	if (ret) {
	if (ret != -EBUSY)
	return;

	store_for_later = true;
	}

	x2 = x + width - 1;
	y2 = y + height - 1;
	spin_lock_irqsave(&mfbdev->dirty_lock, flags);

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

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

	mfbdev->x1 = mfbdev->y1 = INT_MAX;
	mfbdev->x2 = mfbdev->y2 = 0;
	spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);

	if (!bo->kmap.virtual) {
	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
	if (ret) {
	DRM_ERROR("failed to kmap fb updates\n");
	mgag200_bo_unreserve(bo);
	return;
	}
	unmap = true;
	}
	for (i = y; i <= y2; i++) {
	/* assume equal stride for now */
	src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
	memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);

	}
	if (unmap)
	ttm_bo_kunmap(&bo->kmap);

	mgag200_bo_unreserve(bo);
	}

	static void mga_fillrect(struct fb_info *info,
	const struct fb_fillrect *rect)
	{
	struct mga_fbdev *mfbdev = info->par;
	drm_fb_helper_sys_fillrect(info, rect);
	mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
	rect->height);
	}

	static void mga_copyarea(struct fb_info *info,
	const struct fb_copyarea *area)
	{
	struct mga_fbdev *mfbdev = info->par;
	drm_fb_helper_sys_copyarea(info, area);
	mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
	area->height);
	}

	static void mga_imageblit(struct fb_info *info,
	const struct fb_image *image)
	{
	struct mga_fbdev *mfbdev = info->par;
	drm_fb_helper_sys_imageblit(info, image);
	mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
	image->height);
	}


	static struct fb_ops mgag200fb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par,
	.fb_fillrect = mga_fillrect,
	.fb_copyarea = mga_copyarea,
	.fb_imageblit = mga_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	};

	static int mgag200fb_create_object(struct mga_fbdev *afbdev,
	const struct drm_mode_fb_cmd2 *mode_cmd,
	struct drm_gem_object **gobj_p)
	{
	struct drm_device *dev = afbdev->helper.dev;
	u32 size;
	struct drm_gem_object *gobj;
	int ret = 0;

	size = mode_cmd->pitches[0] * mode_cmd->height;
	ret = mgag200_gem_create(dev, size, true, &gobj);
	if (ret)
	return ret;

	*gobj_p = gobj;
	return ret;
	}

	static int mgag200fb_create(struct drm_fb_helper *helper,
	struct drm_fb_helper_surface_size *sizes)
	{
	struct mga_fbdev *mfbdev =
	container_of(helper, struct mga_fbdev, helper);
	struct drm_device *dev = mfbdev->helper.dev;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct mga_device *mdev = dev->dev_private;
	struct fb_info *info;
	struct drm_framebuffer *fb;
	struct drm_gem_object *gobj = NULL;
	int ret;
	void *sysram;
	int size;

	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;

	ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
	if (ret) {
	DRM_ERROR("failed to create fbcon backing object %d\n", ret);
	return ret;
	}

	sysram = vmalloc(size);
	if (!sysram) {
	ret = -ENOMEM;
	goto err_sysram;
	}

	info = drm_fb_helper_alloc_fbi(helper);
	if (IS_ERR(info)) {
	ret = PTR_ERR(info);
	goto err_alloc_fbi;
	}

	info->par = mfbdev;

	ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
	if (ret)
	goto err_alloc_fbi;

	mfbdev->sysram = sysram;
	mfbdev->size = size;

	fb = &mfbdev->mfb.base;

	/* setup helper */
	mfbdev->helper.fb = fb;

	strcpy(info->fix.id, "mgadrmfb");

	info->fbops = &mgag200fb_ops;

	/* setup aperture base/size for vesafb takeover */
	info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
	info->apertures->ranges[0].size = mdev->mc.vram_size;

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
	drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
	sizes->fb_height);

	info->screen_base = sysram;
	info->screen_size = size;
	info->pixmap.flags = FB_PIXMAP_SYSTEM;

	DRM_DEBUG_KMS("allocated %dx%d\n",
	fb->width, fb->height);

	return 0;

	err_alloc_fbi:
	vfree(sysram);
	err_sysram:
	drm_gem_object_put_unlocked(gobj);

	return ret;
	}

	static int mga_fbdev_destroy(struct drm_device *dev,
	struct mga_fbdev *mfbdev)
	{
	struct mga_framebuffer *mfb = &mfbdev->mfb;

	drm_fb_helper_unregister_fbi(&mfbdev->helper);

	if (mfb->obj) {
	drm_gem_object_put_unlocked(mfb->obj);
	mfb->obj = NULL;
	}
	drm_fb_helper_fini(&mfbdev->helper);
	vfree(mfbdev->sysram);
	drm_framebuffer_unregister_private(&mfb->base);
	drm_framebuffer_cleanup(&mfb->base);

	return 0;
	}

	static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
	.fb_probe = mgag200fb_create,
	};

	int mgag200_fbdev_init(struct mga_device *mdev)
	{
	struct mga_fbdev *mfbdev;
	int ret;
	int bpp_sel = 32;

	/* prefer 16bpp on low end gpus with limited VRAM */
	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
	bpp_sel = 16;

	mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
	if (!mfbdev)
	return -ENOMEM;

	mdev->mfbdev = mfbdev;
	spin_lock_init(&mfbdev->dirty_lock);

	drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);

	ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
	MGAG200FB_CONN_LIMIT);
	if (ret)
	goto err_fb_helper;

	ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
	if (ret)
	goto err_fb_setup;

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

	ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
	if (ret)
	goto err_fb_setup;

	return 0;

	err_fb_setup:
	drm_fb_helper_fini(&mfbdev->helper);
	err_fb_helper:
	mdev->mfbdev = NULL;

	return ret;
	}

	void mgag200_fbdev_fini(struct mga_device *mdev)
	{
	if (!mdev->mfbdev)
	return;

	mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
	}