drivers/staging/imgtec/adf_common.c - kernel/x86_64 - Git at Google

 /*************************************************************************/ /*!
 @File
 @Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
 @License        Dual MIT/GPLv2

 The contents of this file are subject to the MIT license as set out below.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 Alternatively, the contents of this file may be used under the terms of
 the GNU General Public License Version 2 ("GPL") in which case the provisions
 of GPL are applicable instead of those above.

 If you wish to allow use of your version of this file only under the terms of
 GPL, and not to allow others to use your version of this file under the terms
 of the MIT license, indicate your decision by deleting the provisions above
 and replace them with the notice and other provisions required by GPL as set
 out in the file called "GPL-COPYING" included in this distribution. If you do
 not delete the provisions above, a recipient may use your version of this file
 under the terms of either the MIT license or GPL.

 This License is also included in this distribution in the file called
 "MIT-COPYING".

 EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
 PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
 COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */ /**************************************************************************/
 /* vi: set ts=8: */

 #include "adf_common.h"

 #include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/dma-buf.h>
 #include <linux/compat.h>
 #include <linux/bug.h>

 #include <video/adf_client.h>

 #ifdef DEBUG_VALIDATE
 #define val_dbg(dev, fmt, x...) dev_dbg(dev, fmt, x)
 #else
 #define val_dbg(dev, fmt, x...) do { } while (0)
 #endif

 static long validate(struct adf_device *dev,
 	struct adf_validate_config_ext __user *arg)
 {
 	struct adf_interface **intfs = NULL;
 	struct adf_validate_config_ext data;
 	struct adf_buffer *bufs = NULL;
 	struct adf_post post_cfg;
 	void *post_ext = NULL;
 	u32 post_ext_size;
 	void *driver_state;
 	int err = 0;
 	size_t i, j;

 	if (copy_from_user(&data, arg, sizeof(data))) {
 		err = -EFAULT;
 		goto err_out;
 	}

 	if (data.n_interfaces > ADF_MAX_INTERFACES) {
 		err = -EINVAL;
 		goto err_out;
 	}

 	if (data.n_bufs > ADF_MAX_BUFFERS) {
 		err = -EINVAL;
 		goto err_out;
 	}

 	post_ext_size = sizeof(struct adf_post_ext) +
 		data.n_bufs * sizeof(struct adf_buffer_config_ext);

 	if (!access_ok(VERIFY_READ, data.bufs,
 	               sizeof(*data.bufs) * data.n_bufs)) {
 		err = -EFAULT;
 		goto err_out;
 	}

 	post_ext = kmalloc(post_ext_size, GFP_KERNEL);
 	if (!post_ext) {
 		err = -ENOMEM;
 		goto err_out;
 	}

 	if (!access_ok(VERIFY_READ, data.post_ext, post_ext_size)) {
 		err = -EFAULT;
 		goto err_out;
 	}

 	if (copy_from_user(post_ext, data.post_ext, post_ext_size)) {
 		err = -EFAULT;
 		goto err_out;
 	}

 	if (data.n_interfaces) {
 		if (!access_ok(VERIFY_READ, data.interfaces,
 		     sizeof(*data.interfaces) *data.n_interfaces)) {
 			err = -EFAULT;
 			goto err_out;
 		}
 		intfs = kmalloc_array(data.n_interfaces, sizeof(intfs[0]),
 				      GFP_KERNEL);
 		if (!intfs) {
 			err = -ENOMEM;
 			goto err_out;
 		}
 	}

 	for (i = 0; i < data.n_interfaces; i++) {
 		u32 intf_id;
 		if (get_user(intf_id, &data.interfaces[i])) {
 			err = -EFAULT;
 			goto err_out;
 		}
 		intfs[i] = idr_find(&dev->interfaces, intf_id);
 		if (!intfs[i]) {
 			err = -EINVAL;
 			goto err_out;
 		}
 	}

 	if (data.n_bufs) {
 		bufs = kcalloc(data.n_bufs, sizeof(bufs[0]), GFP_KERNEL);
 		if (!bufs) {
 			err = -ENOMEM;
 			goto err_out;
 		}
 	}

 	for (i = 0; i < data.n_bufs; i++) {
 		struct adf_buffer_config config;

 		if (copy_from_user(&config, &data.bufs[i], sizeof(config))) {
 			err = -EFAULT;
 			goto err_out;
 		}

 		memset(&bufs[i], 0, sizeof(bufs[i]));

 		if (config.n_planes > ADF_MAX_PLANES) {
 			err = -EINVAL;
 			goto err_import;
 		}

 		bufs[i].overlay_engine = idr_find(&dev->overlay_engines,
 						  config.overlay_engine);
 		if (!bufs[i].overlay_engine) {
 			err = -ENOENT;
 			goto err_import;
 		}

 		bufs[i].w = config.w;
 		bufs[i].h = config.h;
 		bufs[i].format = config.format;

 		for (j = 0; j < config.n_planes; j++) {
 			bufs[i].dma_bufs[j] = dma_buf_get(config.fd[j]);
 			if (IS_ERR_OR_NULL(bufs[i].dma_bufs[j])) {
 				err = PTR_ERR(bufs[i].dma_bufs[j]);
 				bufs[i].dma_bufs[j] = NULL;
 				goto err_import;
 			}
 			bufs[i].offset[j] = config.offset[j];
 			bufs[i].pitch[j] = config.pitch[j];
 		}
 		bufs[i].n_planes = config.n_planes;

 		bufs[i].acquire_fence = NULL;
 	}

 	/* Fake up a post configuration to validate */
 	post_cfg.custom_data_size = post_ext_size;
 	post_cfg.custom_data = post_ext;
 	post_cfg.n_bufs = data.n_bufs;
 	post_cfg.bufs = bufs;

 	/* Mapping dma bufs is too expensive for validate, and we don't
 	 * need to do it at the moment.
 	 */
 	post_cfg.mappings = NULL;

 	err = dev->ops->validate(dev, &post_cfg, &driver_state);
 	if (err)
 		goto err_import;

 	/* For the validate ioctl, we don't need the driver state. If it
 	 * was allocated, free it immediately.
 	 */
 	if (dev->ops->state_free)
 		dev->ops->state_free(dev, driver_state);

 err_import:
 	for (i = 0; i < data.n_bufs; i++)
 		for (j = 0; j < ARRAY_SIZE(bufs[i].dma_bufs); j++)
 			if (bufs[i].dma_bufs[j])
 				dma_buf_put(bufs[i].dma_bufs[j]);
 err_out:
 	kfree(post_ext);
 	kfree(intfs);
 	kfree(bufs);
 	return err;
 }

 static long adf_img_ioctl_validate(struct adf_device *dev,
 struct adf_validate_config_ext __user *arg)
 {
 	int err;

 	if (!access_ok(VERIFY_READ, arg,
 	     sizeof(struct adf_validate_config_ext))) {
 		err = -EFAULT;
 		goto err_out;
 	}
 	err = validate(dev, arg);
 err_out:
 	return err;
 }

 #ifdef CONFIG_COMPAT

 #define ADF_VALIDATE_CONFIG_EXT32 \
 	_IOW(ADF_IOCTL_TYPE, ADF_IOCTL_NR_VALIDATE_IMG, \
 		struct adf_validate_config_ext32)

 struct adf_validate_config_ext32 {
 	__u32		n_interfaces;
 	compat_uptr_t	interfaces;

 	__u32		n_bufs;

 	compat_uptr_t	bufs;
 	compat_uptr_t	post_ext;
 } __packed;

 /* adf_validate_config_ext32 must map to the adf_validate_config_ext struct.
  * Changes to struct adf_validate_config_ext will likely be needed to be
  * mirrored in adf_validate_config_ext32, so put a sanity check here to try
  * to notice if the size has changed from what's expected.
  */

 static long adf_img_ioctl_validate_compat(struct adf_device *dev,
 		  struct adf_validate_config_ext32 __user *arg_compat)
 {
 	struct adf_validate_config_ext arg;
 	int err = 0;

 	BUILD_BUG_ON_MSG(sizeof(struct adf_validate_config_ext) != 32,
 		"adf_validate_config_ext has unexpected size");

 	if (!access_ok(VERIFY_READ, arg_compat,
 		sizeof(struct adf_validate_config_ext32))) {
 		err = -EFAULT;
 		goto err_out;
 	}

 	arg.n_interfaces = arg_compat->n_interfaces;
 	arg.interfaces = compat_ptr(arg_compat->interfaces);
 	arg.n_bufs = arg_compat->n_bufs;
 	arg.bufs = compat_ptr(arg_compat->bufs);
 	arg.post_ext = compat_ptr(arg_compat->post_ext);

 	err = validate(dev, &arg);
 err_out:
 	return err;
 }

 #endif /* CONFIG_COMPAT */

 long adf_img_ioctl(struct adf_obj *obj, unsigned int cmd, unsigned long arg)
 {
 	struct adf_device *dev =
 		(struct adf_device *)obj->parent;

 	switch (cmd) {
 	case ADF_VALIDATE_CONFIG_EXT:
 		return adf_img_ioctl_validate(dev,
 			(struct adf_validate_config_ext __user *)arg);
 #ifdef CONFIG_COMPAT
 	case ADF_VALIDATE_CONFIG_EXT32:
 		return adf_img_ioctl_validate_compat(dev,
 			(struct adf_validate_config_ext32 __user *)
 							compat_ptr(arg));
 #endif
 	}

 	return -ENOTTY;
 }

 /* Callers of this function should have taken the dev->client_lock */

 static struct adf_interface *
 get_interface_attached_to_overlay(struct adf_device *dev,
 				  struct adf_overlay_engine *overlay)
 {
 	struct adf_interface *interface = NULL;
 	struct adf_attachment_list *entry;

 	/* We are open-coding adf_attachment_list_to_array. We can't use the
 	 * adf_device_attachments helper because it takes the client lock,
 	 * which is already held for calls to validate.
 	 */
 	list_for_each_entry(entry, &dev->attached, head) {
 		/* If there are multiple interfaces attached to an overlay,
 		 * this will return the last.
 		 */
 		if (entry->attachment.overlay_engine == overlay)
 			interface = entry->attachment.interface;
 	}

 	return interface;
 }

 int adf_img_validate_simple(struct adf_device *dev, struct adf_post *cfg,
 			    void **driver_state)
 {
 	struct adf_post_ext *post_ext = cfg->custom_data;
 	struct adf_overlay_engine *overlay;
 	struct adf_interface *interface;
 	struct adf_buffer *buffer;
 	int i = 0;
 	struct device *device = dev->dev;
 	size_t expected_custom_data_size;

 	/* "Null" flip handling */
 	if (cfg->n_bufs == 0)
 		return 0;

 	expected_custom_data_size = sizeof(struct adf_post_ext)
 		+ cfg->n_bufs * sizeof(struct adf_buffer_config_ext);
 	if (cfg->custom_data_size != expected_custom_data_size) {
 		val_dbg(device, "Custom data size %zu not expected size %zu",
 			 cfg->custom_data_size,
 			 sizeof(struct adf_buffer_config_ext));
 		return -EINVAL;
 	}

 	if (cfg->n_bufs != 1) {
 		val_dbg(device, "Got %zu buffers in post. Should be 1.\n",
 			cfg->n_bufs);
 		return -EINVAL;
 	}

 	buffer = &cfg->bufs[0];
 	overlay = buffer->overlay_engine;
 	if (!overlay) {
 		dev_err(device, "Buffer without an overlay engine.\n");
 		return -EINVAL;
 	}

 	for (i = 0; i < overlay->ops->n_supported_formats; i++) {
 		if (buffer->format == overlay->ops->supported_formats[i])
 			break;
 	}

 	if (i == overlay->ops->n_supported_formats) {
 		char req_format_str[ADF_FORMAT_STR_SIZE];

 		adf_format_str(buffer->format, req_format_str);

 		val_dbg(device, "Unsupported buffer format %s.\n",
 			req_format_str);
 		return -EINVAL;
 	}

 	interface = get_interface_attached_to_overlay(dev, overlay);
 	if (!interface) {
 		dev_err(device, "No interface attached to overlay\n");
 		return -EINVAL;
 	}

 	if (buffer->w != interface->current_mode.hdisplay) {
 		val_dbg(device, "Buffer width %u is not expected %u.\n",
 			 buffer->w, interface->current_mode.hdisplay);
 		return -EINVAL;
 	}

 	if (buffer->h != interface->current_mode.vdisplay) {
 		val_dbg(device, "Buffer height %u is not expected %u.\n",
 			 buffer->h, interface->current_mode.vdisplay);
 		return -EINVAL;
 	}

 	if (buffer->n_planes != 1) {
 		val_dbg(device, "Buffer n_planes %u is not 1.\n",
 			buffer->n_planes);
 		return -EINVAL;
 	}

 	if (buffer->offset[0] != 0) {
 		val_dbg(device, "Buffer offset %u is not 0.\n",
 			buffer->offset[0]);
 		return -EINVAL;
 	}

 	for (i = 0; i < cfg->n_bufs; i++) {
 		struct adf_buffer_config_ext *buf_ext = &post_ext->bufs_ext[i];
 		u16 hdisplay = interface->current_mode.hdisplay;
 		u16 vdisplay = interface->current_mode.vdisplay;

 		if (buf_ext->crop.x1 != 0 ||
 		    buf_ext->crop.y1 != 0 ||
 		    buf_ext->crop.x2 != hdisplay ||
 		    buf_ext->crop.y2 != vdisplay) {
 			val_dbg(device, "Buffer crop {%u,%u,%u,%u} not expected {%u,%u,%u,%u}.\n",
 				buf_ext->crop.x1, buf_ext->crop.y1,
 				buf_ext->crop.x2, buf_ext->crop.y2,
 				0, 0, hdisplay, vdisplay);

 			/* Userspace might be emulating a lower resolution */
 			if (buf_ext->crop.x2 > hdisplay ||
 			    buf_ext->crop.y2 > vdisplay)
 				return -EINVAL;
 		}

 		if (buf_ext->display.x1 != 0 ||
 		    buf_ext->display.y1 != 0 ||
 		    buf_ext->display.x2 != hdisplay ||
 		    buf_ext->display.y2 != vdisplay) {
 			val_dbg(device, "Buffer display {%u,%u,%u,%u} not expected {%u,%u,%u,%u}.\n",
 				buf_ext->display.x1, buf_ext->display.y1,
 				buf_ext->display.x2, buf_ext->display.y2,
 				0, 0, hdisplay, vdisplay);

 			/* Userspace might be emulating a lower resolution */
 			if (buf_ext->display.x2 > hdisplay ||
 			    buf_ext->display.y2 > vdisplay)
 				return -EINVAL;
 		}

 		if (buf_ext->transform != ADF_BUFFER_TRANSFORM_NONE_EXT) {
 			val_dbg(device, "Buffer transform 0x%x not expected transform 0x%x.\n",
 				buf_ext->transform,
 				ADF_BUFFER_TRANSFORM_NONE_EXT);
 			return -EINVAL;
 		}

 		if (buf_ext->blend_type != ADF_BUFFER_BLENDING_PREMULT_EXT &&
 		    buf_ext->blend_type != ADF_BUFFER_BLENDING_NONE_EXT) {
 			val_dbg(device, "Buffer blend type %u not supported.\n",
 				buf_ext->blend_type);
 			return -EINVAL;
 		}

 		if (buf_ext->plane_alpha != 0xff) {
 			val_dbg(device, "Buffer plane alpha %u not expected plane alpha %u.\n",
 				buf_ext->plane_alpha, 0xff);
 			return -EINVAL;
 		}
 	}

 	return 0;
 }

 bool adf_img_buffer_sanity_check(const struct adf_interface *intf,
 	const struct adf_buffer *buf,
 	const struct adf_buffer_config_ext *buf_ext)
 {
 	struct device *dev = intf->base.parent->dev;
 	int plane;

 	if (buf->w == 0) {
 		dev_err(dev, "Buffer sanity failed: Zero width\n");
 		return false;
 	}
 	if (buf->h == 0) {
 		dev_err(dev, "Buffer sanity failed: Zero height\n");
 		return false;
 	}
 	if (buf->format == 0) {
 		dev_err(dev, "Buffer sanity failed: Zero format\n");
 		return false;
 	}
 	if (buf->pitch == 0) {
 		dev_err(dev, "Buffer sanity failed: Zero pitch\n");
 		return false;
 	}
 	if (buf->n_planes == 0) {
 		dev_err(dev, "Buffer sanity failed: Zero plane count\n");
 		return false;
 	}
 	if (buf->overlay_engine == NULL) {
 		dev_err(dev, "Buffer sanity failed: NULL assigned overlay\n");
 		return false;
 	}

 	for (plane = 0; plane < buf->n_planes; plane++)	{
 		if (buf->dma_bufs[plane] == NULL) {
 			dev_err(dev, "Buffer sanity failed: NULL dma buf for plane %d\n",
 				plane);
 			return false;
 		}
 		if (buf->pitch[plane] == 0) {
 			dev_err(dev, "Buffer sanity failed: Zero pitch for plane %d\n",
 				plane);
 			return false;
 		}
 		/* The offset may be zero, so we can't check that here */
 	}

 	if (buf_ext->crop.x1 >= buf_ext->crop.x2 ||
 	    buf_ext->crop.y1 >= buf_ext->crop.y2) {
 		dev_err(dev, "Buffer sanity failed: Invalid crop rect (%d,%d)(%d,%d)\n",
 			buf_ext->crop.x1, buf_ext->crop.y1,
 			buf_ext->crop.x2, buf_ext->crop.y2);
 		return false;
 	}

 	if (buf_ext->crop.x1 > buf->w ||
 	    buf_ext->crop.x2 > buf->w ||
 	    buf_ext->crop.y1 > buf->h ||
 	    buf_ext->crop.y2 > buf->h) {
 		dev_err(dev, "Buffer sanity failed: Crop rect (%d,%d)(%d,%d) outside of %dx%d source buffer\n",
 			buf_ext->crop.x1, buf_ext->crop.y1,
 			buf_ext->crop.x2, buf_ext->crop.y2,
 			buf->w, buf->h);
 		return false;
 	}

 	if (buf_ext->display.x1 >= buf_ext->display.x2 ||
 	    buf_ext->display.y1 >= buf_ext->display.y2) {
 		dev_err(dev, "Buffer sanity failed: Invalid display rect (%d,%d)(%d,%d)\n",
 			buf_ext->display.x1, buf_ext->display.y1,
 			buf_ext->display.x2, buf_ext->display.y2);
 		return false;
 	}

 	if (buf_ext->crop.x1 > buf->w ||
 	    buf_ext->crop.x2 > buf->w ||
 	    buf_ext->crop.y1 > buf->h ||
 	    buf_ext->crop.y2 > buf->h) {
 		dev_err(dev, "Buffer sanity failed: Display rect (%d,%d)(%d,%d) outside of %dx%d current interface mode\n",
 			buf_ext->crop.x1, buf_ext->crop.y1,
 			buf_ext->crop.x2, buf_ext->crop.y2,
 			intf->current_mode.hdisplay,
 			intf->current_mode.vdisplay);
 	    return false;
 	}

 	switch (buf_ext->transform) {
 	case ADF_BUFFER_TRANSFORM_NONE_EXT:
 	case ADF_BUFFER_TRANSFORM_FLIP_H_EXT:
 	case ADF_BUFFER_TRANSFORM_FLIP_V_EXT:
 	case ADF_BUFFER_TRANSFORM_ROT_90_EXT:
 	case ADF_BUFFER_TRANSFORM_ROT_180_EXT:
 	case ADF_BUFFER_TRANSFORM_ROT_270_EXT:
 		break;
 	default:
 		dev_err(dev, "Invalid transform 0x%x\n", buf_ext->transform);
 		return false;
 	}

 	switch (buf_ext->blend_type) {
 	case ADF_BUFFER_BLENDING_NONE_EXT:
 	case ADF_BUFFER_BLENDING_PREMULT_EXT:
 	case ADF_BUFFER_BLENDING_COVERAGE_EXT:
 		break;
 	default:
 		dev_err(dev, "Invalid blend type 0x%x\n", buf_ext->blend_type);
 		return false;
 	}
 	return true;
 }

 bool adf_img_rects_intersect(const struct drm_clip_rect *rect1,
 	const struct drm_clip_rect *rect2)
 {
 	if (rect1->x1 < rect2->x2 &&
 	    rect1->x2 > rect2->x1 &&
 	    rect1->y1 < rect2->y2 &&
 	    rect1->y2 > rect2->y1)
 		return true;
 	return false;
 }
	/************************************************************************/ /!
	@File
	@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
	@License Dual MIT/GPLv2

	The contents of this file are subject to the MIT license as set out below.

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.

	Alternatively, the contents of this file may be used under the terms of
	the GNU General Public License Version 2 ("GPL") in which case the provisions
	of GPL are applicable instead of those above.

	If you wish to allow use of your version of this file only under the terms of
	GPL, and not to allow others to use your version of this file under the terms
	of the MIT license, indicate your decision by deleting the provisions above
	and replace them with the notice and other provisions required by GPL as set
	out in the file called "GPL-COPYING" included in this distribution. If you do
	not delete the provisions above, a recipient may use your version of this file
	under the terms of either the MIT license or GPL.

	This License is also included in this distribution in the file called
	"MIT-COPYING".

	EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
	PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
	BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
	PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
	COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
	IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	/ /*************************************************************************/
	/* vi: set ts=8: */

	#include "adf_common.h"

	#include <linux/uaccess.h>
	#include <linux/slab.h>
	#include <linux/dma-buf.h>
	#include <linux/compat.h>
	#include <linux/bug.h>

	#include <video/adf_client.h>

	#ifdef DEBUG_VALIDATE
	#define val_dbg(dev, fmt, x...) dev_dbg(dev, fmt, x)
	#else
	#define val_dbg(dev, fmt, x...) do { } while (0)
	#endif

	static long validate(struct adf_device *dev,
	struct adf_validate_config_ext __user *arg)
	{
	struct adf_interface **intfs = NULL;
	struct adf_validate_config_ext data;
	struct adf_buffer *bufs = NULL;
	struct adf_post post_cfg;
	void *post_ext = NULL;
	u32 post_ext_size;
	void *driver_state;
	int err = 0;
	size_t i, j;

	if (copy_from_user(&data, arg, sizeof(data))) {
	err = -EFAULT;
	goto err_out;
	}

	if (data.n_interfaces > ADF_MAX_INTERFACES) {
	err = -EINVAL;
	goto err_out;
	}

	if (data.n_bufs > ADF_MAX_BUFFERS) {
	err = -EINVAL;
	goto err_out;
	}

	post_ext_size = sizeof(struct adf_post_ext) +
	data.n_bufs * sizeof(struct adf_buffer_config_ext);

	if (!access_ok(VERIFY_READ, data.bufs,
	sizeof(data.bufs) data.n_bufs)) {
	err = -EFAULT;
	goto err_out;
	}

	post_ext = kmalloc(post_ext_size, GFP_KERNEL);
	if (!post_ext) {
	err = -ENOMEM;
	goto err_out;
	}

	if (!access_ok(VERIFY_READ, data.post_ext, post_ext_size)) {
	err = -EFAULT;
	goto err_out;
	}

	if (copy_from_user(post_ext, data.post_ext, post_ext_size)) {
	err = -EFAULT;
	goto err_out;
	}

	if (data.n_interfaces) {
	if (!access_ok(VERIFY_READ, data.interfaces,
	sizeof(data.interfaces) data.n_interfaces)) {
	err = -EFAULT;
	goto err_out;
	}
	intfs = kmalloc_array(data.n_interfaces, sizeof(intfs[0]),
	GFP_KERNEL);
	if (!intfs) {
	err = -ENOMEM;
	goto err_out;
	}
	}

	for (i = 0; i < data.n_interfaces; i++) {
	u32 intf_id;
	if (get_user(intf_id, &data.interfaces[i])) {
	err = -EFAULT;
	goto err_out;
	}
	intfs[i] = idr_find(&dev->interfaces, intf_id);
	if (!intfs[i]) {
	err = -EINVAL;
	goto err_out;
	}
	}

	if (data.n_bufs) {
	bufs = kcalloc(data.n_bufs, sizeof(bufs[0]), GFP_KERNEL);
	if (!bufs) {
	err = -ENOMEM;
	goto err_out;
	}
	}

	for (i = 0; i < data.n_bufs; i++) {
	struct adf_buffer_config config;

	if (copy_from_user(&config, &data.bufs[i], sizeof(config))) {
	err = -EFAULT;
	goto err_out;
	}

	memset(&bufs[i], 0, sizeof(bufs[i]));

	if (config.n_planes > ADF_MAX_PLANES) {
	err = -EINVAL;
	goto err_import;
	}

	bufs[i].overlay_engine = idr_find(&dev->overlay_engines,
	config.overlay_engine);
	if (!bufs[i].overlay_engine) {
	err = -ENOENT;
	goto err_import;
	}

	bufs[i].w = config.w;
	bufs[i].h = config.h;
	bufs[i].format = config.format;

	for (j = 0; j < config.n_planes; j++) {
	bufs[i].dma_bufs[j] = dma_buf_get(config.fd[j]);
	if (IS_ERR_OR_NULL(bufs[i].dma_bufs[j])) {
	err = PTR_ERR(bufs[i].dma_bufs[j]);
	bufs[i].dma_bufs[j] = NULL;
	goto err_import;
	}
	bufs[i].offset[j] = config.offset[j];
	bufs[i].pitch[j] = config.pitch[j];
	}
	bufs[i].n_planes = config.n_planes;

	bufs[i].acquire_fence = NULL;
	}

	/* Fake up a post configuration to validate */
	post_cfg.custom_data_size = post_ext_size;
	post_cfg.custom_data = post_ext;
	post_cfg.n_bufs = data.n_bufs;
	post_cfg.bufs = bufs;

	/* Mapping dma bufs is too expensive for validate, and we don't
	* need to do it at the moment.
	*/
	post_cfg.mappings = NULL;

	err = dev->ops->validate(dev, &post_cfg, &driver_state);
	if (err)
	goto err_import;

	/* For the validate ioctl, we don't need the driver state. If it
	* was allocated, free it immediately.
	*/
	if (dev->ops->state_free)
	dev->ops->state_free(dev, driver_state);

	err_import:
	for (i = 0; i < data.n_bufs; i++)
	for (j = 0; j < ARRAY_SIZE(bufs[i].dma_bufs); j++)
	if (bufs[i].dma_bufs[j])
	dma_buf_put(bufs[i].dma_bufs[j]);
	err_out:
	kfree(post_ext);
	kfree(intfs);
	kfree(bufs);
	return err;
	}

	static long adf_img_ioctl_validate(struct adf_device *dev,
	struct adf_validate_config_ext __user *arg)
	{
	int err;

	if (!access_ok(VERIFY_READ, arg,
	sizeof(struct adf_validate_config_ext))) {
	err = -EFAULT;
	goto err_out;
	}
	err = validate(dev, arg);
	err_out:
	return err;
	}

	#ifdef CONFIG_COMPAT

	#define ADF_VALIDATE_CONFIG_EXT32 \
	_IOW(ADF_IOCTL_TYPE, ADF_IOCTL_NR_VALIDATE_IMG, \
	struct adf_validate_config_ext32)

	struct adf_validate_config_ext32 {
	__u32 n_interfaces;
	compat_uptr_t interfaces;

	__u32 n_bufs;

	compat_uptr_t bufs;
	compat_uptr_t post_ext;
	} __packed;

	/* adf_validate_config_ext32 must map to the adf_validate_config_ext struct.
	* Changes to struct adf_validate_config_ext will likely be needed to be
	* mirrored in adf_validate_config_ext32, so put a sanity check here to try
	* to notice if the size has changed from what's expected.
	*/

	static long adf_img_ioctl_validate_compat(struct adf_device *dev,
	struct adf_validate_config_ext32 __user *arg_compat)
	{
	struct adf_validate_config_ext arg;
	int err = 0;

	BUILD_BUG_ON_MSG(sizeof(struct adf_validate_config_ext) != 32,
	"adf_validate_config_ext has unexpected size");

	if (!access_ok(VERIFY_READ, arg_compat,
	sizeof(struct adf_validate_config_ext32))) {
	err = -EFAULT;
	goto err_out;
	}

	arg.n_interfaces = arg_compat->n_interfaces;
	arg.interfaces = compat_ptr(arg_compat->interfaces);
	arg.n_bufs = arg_compat->n_bufs;
	arg.bufs = compat_ptr(arg_compat->bufs);
	arg.post_ext = compat_ptr(arg_compat->post_ext);

	err = validate(dev, &arg);
	err_out:
	return err;
	}

	#endif /* CONFIG_COMPAT */

	long adf_img_ioctl(struct adf_obj *obj, unsigned int cmd, unsigned long arg)
	{
	struct adf_device *dev =
	(struct adf_device *)obj->parent;

	switch (cmd) {
	case ADF_VALIDATE_CONFIG_EXT:
	return adf_img_ioctl_validate(dev,
	(struct adf_validate_config_ext __user *)arg);
	#ifdef CONFIG_COMPAT
	case ADF_VALIDATE_CONFIG_EXT32:
	return adf_img_ioctl_validate_compat(dev,
	(struct adf_validate_config_ext32 __user *)
	compat_ptr(arg));
	#endif
	}

	return -ENOTTY;
	}

	/* Callers of this function should have taken the dev->client_lock */

	static struct adf_interface *
	get_interface_attached_to_overlay(struct adf_device *dev,
	struct adf_overlay_engine *overlay)
	{
	struct adf_interface *interface = NULL;
	struct adf_attachment_list *entry;

	/* We are open-coding adf_attachment_list_to_array. We can't use the
	* adf_device_attachments helper because it takes the client lock,
	* which is already held for calls to validate.
	*/
	list_for_each_entry(entry, &dev->attached, head) {
	/* If there are multiple interfaces attached to an overlay,
	* this will return the last.
	*/
	if (entry->attachment.overlay_engine == overlay)
	interface = entry->attachment.interface;
	}

	return interface;
	}

	int adf_img_validate_simple(struct adf_device dev, struct adf_post cfg,
	void **driver_state)
	{
	struct adf_post_ext *post_ext = cfg->custom_data;
	struct adf_overlay_engine *overlay;
	struct adf_interface *interface;
	struct adf_buffer *buffer;
	int i = 0;
	struct device *device = dev->dev;
	size_t expected_custom_data_size;

	/* "Null" flip handling */
	if (cfg->n_bufs == 0)
	return 0;

	expected_custom_data_size = sizeof(struct adf_post_ext)
	+ cfg->n_bufs * sizeof(struct adf_buffer_config_ext);
	if (cfg->custom_data_size != expected_custom_data_size) {
	val_dbg(device, "Custom data size %zu not expected size %zu",
	cfg->custom_data_size,
	sizeof(struct adf_buffer_config_ext));
	return -EINVAL;
	}

	if (cfg->n_bufs != 1) {
	val_dbg(device, "Got %zu buffers in post. Should be 1.\n",
	cfg->n_bufs);
	return -EINVAL;
	}

	buffer = &cfg->bufs[0];
	overlay = buffer->overlay_engine;
	if (!overlay) {
	dev_err(device, "Buffer without an overlay engine.\n");
	return -EINVAL;
	}

	for (i = 0; i < overlay->ops->n_supported_formats; i++) {
	if (buffer->format == overlay->ops->supported_formats[i])
	break;
	}

	if (i == overlay->ops->n_supported_formats) {
	char req_format_str[ADF_FORMAT_STR_SIZE];

	adf_format_str(buffer->format, req_format_str);

	val_dbg(device, "Unsupported buffer format %s.\n",
	req_format_str);
	return -EINVAL;
	}

	interface = get_interface_attached_to_overlay(dev, overlay);
	if (!interface) {
	dev_err(device, "No interface attached to overlay\n");
	return -EINVAL;
	}

	if (buffer->w != interface->current_mode.hdisplay) {
	val_dbg(device, "Buffer width %u is not expected %u.\n",
	buffer->w, interface->current_mode.hdisplay);
	return -EINVAL;
	}

	if (buffer->h != interface->current_mode.vdisplay) {
	val_dbg(device, "Buffer height %u is not expected %u.\n",
	buffer->h, interface->current_mode.vdisplay);
	return -EINVAL;
	}

	if (buffer->n_planes != 1) {
	val_dbg(device, "Buffer n_planes %u is not 1.\n",
	buffer->n_planes);
	return -EINVAL;
	}

	if (buffer->offset[0] != 0) {
	val_dbg(device, "Buffer offset %u is not 0.\n",
	buffer->offset[0]);
	return -EINVAL;
	}

	for (i = 0; i < cfg->n_bufs; i++) {
	struct adf_buffer_config_ext *buf_ext = &post_ext->bufs_ext[i];
	u16 hdisplay = interface->current_mode.hdisplay;
	u16 vdisplay = interface->current_mode.vdisplay;

	if (buf_ext->crop.x1 != 0 \|\|
	buf_ext->crop.y1 != 0 \|\|
	buf_ext->crop.x2 != hdisplay \|\|
	buf_ext->crop.y2 != vdisplay) {
	val_dbg(device, "Buffer crop {%u,%u,%u,%u} not expected {%u,%u,%u,%u}.\n",
	buf_ext->crop.x1, buf_ext->crop.y1,
	buf_ext->crop.x2, buf_ext->crop.y2,
	0, 0, hdisplay, vdisplay);

	/* Userspace might be emulating a lower resolution */
	if (buf_ext->crop.x2 > hdisplay \|\|
	buf_ext->crop.y2 > vdisplay)
	return -EINVAL;
	}

	if (buf_ext->display.x1 != 0 \|\|
	buf_ext->display.y1 != 0 \|\|
	buf_ext->display.x2 != hdisplay \|\|
	buf_ext->display.y2 != vdisplay) {
	val_dbg(device, "Buffer display {%u,%u,%u,%u} not expected {%u,%u,%u,%u}.\n",
	buf_ext->display.x1, buf_ext->display.y1,
	buf_ext->display.x2, buf_ext->display.y2,
	0, 0, hdisplay, vdisplay);

	/* Userspace might be emulating a lower resolution */
	if (buf_ext->display.x2 > hdisplay \|\|
	buf_ext->display.y2 > vdisplay)
	return -EINVAL;
	}

	if (buf_ext->transform != ADF_BUFFER_TRANSFORM_NONE_EXT) {
	val_dbg(device, "Buffer transform 0x%x not expected transform 0x%x.\n",
	buf_ext->transform,
	ADF_BUFFER_TRANSFORM_NONE_EXT);
	return -EINVAL;
	}

	if (buf_ext->blend_type != ADF_BUFFER_BLENDING_PREMULT_EXT &&
	buf_ext->blend_type != ADF_BUFFER_BLENDING_NONE_EXT) {
	val_dbg(device, "Buffer blend type %u not supported.\n",
	buf_ext->blend_type);
	return -EINVAL;
	}

	if (buf_ext->plane_alpha != 0xff) {
	val_dbg(device, "Buffer plane alpha %u not expected plane alpha %u.\n",
	buf_ext->plane_alpha, 0xff);
	return -EINVAL;
	}
	}

	return 0;
	}

	bool adf_img_buffer_sanity_check(const struct adf_interface *intf,
	const struct adf_buffer *buf,
	const struct adf_buffer_config_ext *buf_ext)
	{
	struct device *dev = intf->base.parent->dev;
	int plane;

	if (buf->w == 0) {
	dev_err(dev, "Buffer sanity failed: Zero width\n");
	return false;
	}
	if (buf->h == 0) {
	dev_err(dev, "Buffer sanity failed: Zero height\n");
	return false;
	}
	if (buf->format == 0) {
	dev_err(dev, "Buffer sanity failed: Zero format\n");
	return false;
	}
	if (buf->pitch == 0) {
	dev_err(dev, "Buffer sanity failed: Zero pitch\n");
	return false;
	}
	if (buf->n_planes == 0) {
	dev_err(dev, "Buffer sanity failed: Zero plane count\n");
	return false;
	}
	if (buf->overlay_engine == NULL) {
	dev_err(dev, "Buffer sanity failed: NULL assigned overlay\n");
	return false;
	}

	for (plane = 0; plane < buf->n_planes; plane++) {
	if (buf->dma_bufs[plane] == NULL) {
	dev_err(dev, "Buffer sanity failed: NULL dma buf for plane %d\n",
	plane);
	return false;
	}
	if (buf->pitch[plane] == 0) {
	dev_err(dev, "Buffer sanity failed: Zero pitch for plane %d\n",
	plane);
	return false;
	}
	/* The offset may be zero, so we can't check that here */
	}

	if (buf_ext->crop.x1 >= buf_ext->crop.x2 \|\|
	buf_ext->crop.y1 >= buf_ext->crop.y2) {
	dev_err(dev, "Buffer sanity failed: Invalid crop rect (%d,%d)(%d,%d)\n",
	buf_ext->crop.x1, buf_ext->crop.y1,
	buf_ext->crop.x2, buf_ext->crop.y2);
	return false;
	}

	if (buf_ext->crop.x1 > buf->w \|\|
	buf_ext->crop.x2 > buf->w \|\|
	buf_ext->crop.y1 > buf->h \|\|
	buf_ext->crop.y2 > buf->h) {
	dev_err(dev, "Buffer sanity failed: Crop rect (%d,%d)(%d,%d) outside of %dx%d source buffer\n",
	buf_ext->crop.x1, buf_ext->crop.y1,
	buf_ext->crop.x2, buf_ext->crop.y2,
	buf->w, buf->h);
	return false;
	}

	if (buf_ext->display.x1 >= buf_ext->display.x2 \|\|
	buf_ext->display.y1 >= buf_ext->display.y2) {
	dev_err(dev, "Buffer sanity failed: Invalid display rect (%d,%d)(%d,%d)\n",
	buf_ext->display.x1, buf_ext->display.y1,
	buf_ext->display.x2, buf_ext->display.y2);
	return false;
	}

	if (buf_ext->crop.x1 > buf->w \|\|
	buf_ext->crop.x2 > buf->w \|\|
	buf_ext->crop.y1 > buf->h \|\|
	buf_ext->crop.y2 > buf->h) {
	dev_err(dev, "Buffer sanity failed: Display rect (%d,%d)(%d,%d) outside of %dx%d current interface mode\n",
	buf_ext->crop.x1, buf_ext->crop.y1,
	buf_ext->crop.x2, buf_ext->crop.y2,
	intf->current_mode.hdisplay,
	intf->current_mode.vdisplay);
	return false;
	}

	switch (buf_ext->transform) {
	case ADF_BUFFER_TRANSFORM_NONE_EXT:
	case ADF_BUFFER_TRANSFORM_FLIP_H_EXT:
	case ADF_BUFFER_TRANSFORM_FLIP_V_EXT:
	case ADF_BUFFER_TRANSFORM_ROT_90_EXT:
	case ADF_BUFFER_TRANSFORM_ROT_180_EXT:
	case ADF_BUFFER_TRANSFORM_ROT_270_EXT:
	break;
	default:
	dev_err(dev, "Invalid transform 0x%x\n", buf_ext->transform);
	return false;
	}

	switch (buf_ext->blend_type) {
	case ADF_BUFFER_BLENDING_NONE_EXT:
	case ADF_BUFFER_BLENDING_PREMULT_EXT:
	case ADF_BUFFER_BLENDING_COVERAGE_EXT:
	break;
	default:
	dev_err(dev, "Invalid blend type 0x%x\n", buf_ext->blend_type);
	return false;
	}
	return true;
	}

	bool adf_img_rects_intersect(const struct drm_clip_rect *rect1,
	const struct drm_clip_rect *rect2)
	{
	if (rect1->x1 < rect2->x2 &&
	rect1->x2 > rect2->x1 &&
	rect1->y1 < rect2->y2 &&
	rect1->y2 > rect2->y1)
	return true;
	return false;
	}