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Commit ec8f112d authored by David Herrmann's avatar David Herrmann
Browse files

drm: merge drm_drv.c into drm_ioctl.c 



All that is left in drm_drv.c is ioctl management. Merge it into
drm_ioctl.c so we have all ioctl management in one file (and the name is
much more fitting).

Maybe we should now rename drm_stub.c to drm_drv.c again?

Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarDavid Herrmann <dh.herrmann@gmail.com>
parent 1b7199fe

drivers/gpu/drm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ ccflags-y := -Iinclude/drm 


drm-y       :=	drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \

		drm_context.o drm_dma.o \

		drm_drv.o drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \

		drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \

		drm_lock.o drm_memory.o drm_stub.o drm_vm.o \

		drm_agpsupport.o drm_scatter.o drm_pci.o \

		drm_platform.o drm_sysfs.o drm_hashtab.o drm_mm.o \

drivers/gpu/drm/drm_drv.c

deleted100644 → 0
+0 −412
Original line number Diff line number Diff line 
/**

 * \file drm_drv.c

 * Generic driver template

 *

 * \author Rickard E. (Rik) Faith <faith@valinux.com>

 * \author Gareth Hughes <gareth@valinux.com>

 *

 * To use this template, you must at least define the following (samples

 * given for the MGA driver):

 *

 * \code

 * #define DRIVER_AUTHOR	"VA Linux Systems, Inc."

 *

 * #define DRIVER_NAME		"mga"

 * #define DRIVER_DESC		"Matrox G200/G400"

 * #define DRIVER_DATE		"20001127"

 *

 * #define drm_x		mga_##x

 * \endcode

 */



/*

 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com

 *

 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.

 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

 * All Rights Reserved.

 *

 * 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 (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * 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.  IN NO EVENT SHALL

 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.

 */



#include <linux/debugfs.h>

#include <linux/slab.h>

#include <linux/export.h>

#include <drm/drmP.h>

#include <drm/drm_core.h>





static int drm_version(struct drm_device *dev, void *data,

		       struct drm_file *file_priv);



#define DRM_IOCTL_DEF(ioctl, _func, _flags) \

	[DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}



/** Ioctl table */

static const struct drm_ioctl_desc drm_ioctls[] = {

	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),



	DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),



	DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),



	DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),



	DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, DRM_AUTH),



	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),



#if __OS_HAS_AGP

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

#endif



	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),



	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),



	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),



	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),



	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),



	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),



	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),



	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

	DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),

};



#define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )



/**

 * Copy and IOCTL return string to user space

 */

static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)

{

	int len;



	/* don't overflow userbuf */

	len = strlen(value);

	if (len > *buf_len)

		len = *buf_len;



	/* let userspace know exact length of driver value (which could be

	 * larger than the userspace-supplied buffer) */

	*buf_len = strlen(value);



	/* finally, try filling in the userbuf */

	if (len && buf)

		if (copy_to_user(buf, value, len))

			return -EFAULT;

	return 0;

}



/**

 * Get version information

 *

 * \param inode device inode.

 * \param filp file pointer.

 * \param cmd command.

 * \param arg user argument, pointing to a drm_version structure.

 * \return zero on success or negative number on failure.

 *

 * Fills in the version information in \p arg.

 */

static int drm_version(struct drm_device *dev, void *data,

		       struct drm_file *file_priv)

{

	struct drm_version *version = data;

	int err;



	version->version_major = dev->driver->major;

	version->version_minor = dev->driver->minor;

	version->version_patchlevel = dev->driver->patchlevel;

	err = drm_copy_field(version->name, &version->name_len,

			dev->driver->name);

	if (!err)

		err = drm_copy_field(version->date, &version->date_len,

				dev->driver->date);

	if (!err)

		err = drm_copy_field(version->desc, &version->desc_len,

				dev->driver->desc);



	return err;

}



/**

 * drm_ioctl_permit - Check ioctl permissions against caller

 *

 * @flags: ioctl permission flags.

 * @file_priv: Pointer to struct drm_file identifying the caller.

 *

 * Checks whether the caller is allowed to run an ioctl with the

 * indicated permissions. If so, returns zero. Otherwise returns an

 * error code suitable for ioctl return.

 */

static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)

{

	/* ROOT_ONLY is only for CAP_SYS_ADMIN */

	if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))

		return -EACCES;



	/* AUTH is only for authenticated or render client */

	if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&

		     !file_priv->authenticated))

		return -EACCES;



	/* MASTER is only for master or control clients */

	if (unlikely((flags & DRM_MASTER) && !drm_is_master(file_priv) &&

		     !drm_is_control_client(file_priv)))

		return -EACCES;



	/* Control clients must be explicitly allowed */

	if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&

		     drm_is_control_client(file_priv)))

		return -EACCES;



	/* Render clients must be explicitly allowed */

	if (unlikely(!(flags & DRM_RENDER_ALLOW) &&

		     drm_is_render_client(file_priv)))

		return -EACCES;



	return 0;

}



/**

 * Called whenever a process performs an ioctl on /dev/drm.

 *

 * \param inode device inode.

 * \param file_priv DRM file private.

 * \param cmd command.

 * \param arg user argument.

 * \return zero on success or negative number on failure.

 *

 * Looks up the ioctl function in the ::ioctls table, checking for root

 * previleges if so required, and dispatches to the respective function.

 */

long drm_ioctl(struct file *filp,

	      unsigned int cmd, unsigned long arg)

{

	struct drm_file *file_priv = filp->private_data;

	struct drm_device *dev;

	const struct drm_ioctl_desc *ioctl = NULL;

	drm_ioctl_t *func;

	unsigned int nr = DRM_IOCTL_NR(cmd);

	int retcode = -EINVAL;

	char stack_kdata[128];

	char *kdata = NULL;

	unsigned int usize, asize;



	dev = file_priv->minor->dev;



	if (drm_device_is_unplugged(dev))

		return -ENODEV;



	if ((nr >= DRM_CORE_IOCTL_COUNT) &&

	    ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))

		goto err_i1;

	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&

	    (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {

		u32 drv_size;

		ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];

		drv_size = _IOC_SIZE(ioctl->cmd_drv);

		usize = asize = _IOC_SIZE(cmd);

		if (drv_size > asize)

			asize = drv_size;

		cmd = ioctl->cmd_drv;

	}

	else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {

		u32 drv_size;



		ioctl = &drm_ioctls[nr];



		drv_size = _IOC_SIZE(ioctl->cmd);

		usize = asize = _IOC_SIZE(cmd);

		if (drv_size > asize)

			asize = drv_size;



		cmd = ioctl->cmd;

	} else

		goto err_i1;



	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",

		  task_pid_nr(current),

		  (long)old_encode_dev(file_priv->minor->kdev->devt),

		  file_priv->authenticated, ioctl->name);



	/* Do not trust userspace, use our own definition */

	func = ioctl->func;



	if (unlikely(!func)) {

		DRM_DEBUG("no function\n");

		retcode = -EINVAL;

		goto err_i1;

	}



	retcode = drm_ioctl_permit(ioctl->flags, file_priv);

	if (unlikely(retcode))

		goto err_i1;



	if (cmd & (IOC_IN | IOC_OUT)) {

		if (asize <= sizeof(stack_kdata)) {

			kdata = stack_kdata;

		} else {

			kdata = kmalloc(asize, GFP_KERNEL);

			if (!kdata) {

				retcode = -ENOMEM;

				goto err_i1;

			}

		}

		if (asize > usize)

			memset(kdata + usize, 0, asize - usize);

	}



	if (cmd & IOC_IN) {

		if (copy_from_user(kdata, (void __user *)arg,

				   usize) != 0) {

			retcode = -EFAULT;

			goto err_i1;

		}

	} else if (cmd & IOC_OUT) {

		memset(kdata, 0, usize);

	}



	if (ioctl->flags & DRM_UNLOCKED)

		retcode = func(dev, kdata, file_priv);

	else {

		mutex_lock(&drm_global_mutex);

		retcode = func(dev, kdata, file_priv);

		mutex_unlock(&drm_global_mutex);

	}



	if (cmd & IOC_OUT) {

		if (copy_to_user((void __user *)arg, kdata,

				 usize) != 0)

			retcode = -EFAULT;

	}



      err_i1:

	if (!ioctl)

		DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",

			  task_pid_nr(current),

			  (long)old_encode_dev(file_priv->minor->kdev->devt),

			  file_priv->authenticated, cmd, nr);



	if (kdata != stack_kdata)

		kfree(kdata);

	if (retcode)

		DRM_DEBUG("ret = %d\n", retcode);

	return retcode;

}

EXPORT_SYMBOL(drm_ioctl);



/**

 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags

 *

 * @nr: Ioctl number.

 * @flags: Where to return the ioctl permission flags

 */

bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)

{

	if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||

	    (nr < DRM_COMMAND_BASE)) {

		*flags = drm_ioctls[nr].flags;

		return true;

	}



	return false;

}

EXPORT_SYMBOL(drm_ioctl_flags);

drivers/gpu/drm/drm_ioctl.c

+361 −8

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