drm/vmwgfx: Remove the reservation semaphore

	    vmwgfx_cotable.o vmwgfx_so.o vmwgfx_binding.o vmwgfx_msg.o \

	    vmwgfx_simple_resource.o vmwgfx_va.o vmwgfx_blit.o \

	    vmwgfx_validation.o vmwgfx_page_dirty.o vmwgfx_streamoutput.o \

	    ttm_object.o ttm_lock.o ttm_memory.o

	    ttm_object.o ttm_memory.o

vmwgfx-$(CONFIG_DRM_FBDEV_EMULATION) += vmwgfx_fb.o

vmwgfx-$(CONFIG_TRANSPARENT_HUGEPAGE) += vmwgfx_thp.o

/* SPDX-License-Identifier: GPL-2.0 OR MIT */

/**************************************************************************

 *

 * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA

 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS 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.

 *

 **************************************************************************/

/*

 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

 */

#include <linux/atomic.h>

#include <linux/errno.h>

#include <linux/wait.h>

#include <linux/sched/signal.h>

#include "ttm_lock.h"

#include "ttm_object.h"

#define TTM_WRITE_LOCK_PENDING    (1 << 0)

#define TTM_VT_LOCK_PENDING       (1 << 1)

#define TTM_SUSPEND_LOCK_PENDING  (1 << 2)

#define TTM_VT_LOCK               (1 << 3)

#define TTM_SUSPEND_LOCK          (1 << 4)

void ttm_lock_init(struct ttm_lock *lock)

{

	spin_lock_init(&lock->lock);

	init_waitqueue_head(&lock->queue);

	lock->rw = 0;

	lock->flags = 0;

}

void ttm_read_unlock(struct ttm_lock *lock)

{

	spin_lock(&lock->lock);

	if (--lock->rw == 0)

		wake_up_all(&lock->queue);

	spin_unlock(&lock->lock);

}

static bool __ttm_read_lock(struct ttm_lock *lock)

{

	bool locked = false;

	spin_lock(&lock->lock);

	if (lock->rw >= 0 && lock->flags == 0) {

		++lock->rw;

		locked = true;

	}

	spin_unlock(&lock->lock);

	return locked;

}

int ttm_read_lock(struct ttm_lock *lock, bool interruptible)

{

	int ret = 0;

	if (interruptible)

		ret = wait_event_interruptible(lock->queue,

					       __ttm_read_lock(lock));

	else

		wait_event(lock->queue, __ttm_read_lock(lock));

	return ret;

}

static bool __ttm_read_trylock(struct ttm_lock *lock, bool *locked)

{

	bool block = true;

	*locked = false;

	spin_lock(&lock->lock);

	if (lock->rw >= 0 && lock->flags == 0) {

		++lock->rw;

		block = false;

		*locked = true;

	} else if (lock->flags == 0) {

		block = false;

	}

	spin_unlock(&lock->lock);

	return !block;

}

int ttm_read_trylock(struct ttm_lock *lock, bool interruptible)

{

	int ret = 0;

	bool locked;

	if (interruptible)

		ret = wait_event_interruptible

			(lock->queue, __ttm_read_trylock(lock, &locked));

	else

		wait_event(lock->queue, __ttm_read_trylock(lock, &locked));

	if (unlikely(ret != 0)) {

		BUG_ON(locked);

		return ret;

	}

	return (locked) ? 0 : -EBUSY;

}

void ttm_write_unlock(struct ttm_lock *lock)

{

	spin_lock(&lock->lock);

	lock->rw = 0;

	wake_up_all(&lock->queue);

	spin_unlock(&lock->lock);

}

static bool __ttm_write_lock(struct ttm_lock *lock)

{

	bool locked = false;

	spin_lock(&lock->lock);

	if (lock->rw == 0 && ((lock->flags & ~TTM_WRITE_LOCK_PENDING) == 0)) {

		lock->rw = -1;

		lock->flags &= ~TTM_WRITE_LOCK_PENDING;

		locked = true;

	} else {

		lock->flags |= TTM_WRITE_LOCK_PENDING;

	}

	spin_unlock(&lock->lock);

	return locked;

}

int ttm_write_lock(struct ttm_lock *lock, bool interruptible)

{

	int ret = 0;

	if (interruptible) {

		ret = wait_event_interruptible(lock->queue,

					       __ttm_write_lock(lock));

		if (unlikely(ret != 0)) {

			spin_lock(&lock->lock);

			lock->flags &= ~TTM_WRITE_LOCK_PENDING;

			wake_up_all(&lock->queue);

			spin_unlock(&lock->lock);

		}

	} else

		wait_event(lock->queue, __ttm_write_lock(lock));

	return ret;

}

void ttm_suspend_unlock(struct ttm_lock *lock)

{

	spin_lock(&lock->lock);

	lock->flags &= ~TTM_SUSPEND_LOCK;

	wake_up_all(&lock->queue);

	spin_unlock(&lock->lock);

}

static bool __ttm_suspend_lock(struct ttm_lock *lock)

{

	bool locked = false;

	spin_lock(&lock->lock);

	if (lock->rw == 0) {

		lock->flags &= ~TTM_SUSPEND_LOCK_PENDING;

		lock->flags |= TTM_SUSPEND_LOCK;

		locked = true;

	} else {

		lock->flags |= TTM_SUSPEND_LOCK_PENDING;

	}

	spin_unlock(&lock->lock);

	return locked;

}

void ttm_suspend_lock(struct ttm_lock *lock)

{

	wait_event(lock->queue, __ttm_suspend_lock(lock));

}

/**************************************************************************

 *

 * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA

 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS 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.

 *

 **************************************************************************/

/*

 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

 */

/** @file ttm_lock.h

 * This file implements a simple replacement for the buffer manager use

 * of the DRM heavyweight hardware lock.

 * The lock is a read-write lock. Taking it in read mode and write mode

 * is relatively fast, and intended for in-kernel use only.

 *

 * The vt mode is used only when there is a need to block all

 * user-space processes from validating buffers.

 * It's allowed to leave kernel space with the vt lock held.

 * If a user-space process dies while having the vt-lock,

 * it will be released during the file descriptor release. The vt lock

 * excludes write lock and read lock.

 *

 * The suspend mode is used to lock out all TTM users when preparing for

 * and executing suspend operations.

 *

 */

#ifndef _TTM_LOCK_H_

#define _TTM_LOCK_H_

#include <linux/atomic.h>

#include <linux/wait.h>

#include "ttm_object.h"

/**

 * struct ttm_lock

 *

 * @base: ttm base object used solely to release the lock if the client

 * holding the lock dies.

 * @queue: Queue for processes waiting for lock change-of-status.

 * @lock: Spinlock protecting some lock members.

 * @rw: Read-write lock counter. Protected by @lock.

 * @flags: Lock state. Protected by @lock.

 */

struct ttm_lock {

	struct ttm_base_object base;

	wait_queue_head_t queue;

	spinlock_t lock;

	int32_t rw;

	uint32_t flags;

};

/**

 * ttm_lock_init

 *

 * @lock: Pointer to a struct ttm_lock

 * Initializes the lock.

 */

extern void ttm_lock_init(struct ttm_lock *lock);

/**

 * ttm_read_unlock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Releases a read lock.

 */

extern void ttm_read_unlock(struct ttm_lock *lock);

/**

 * ttm_read_lock

 *

 * @lock: Pointer to a struct ttm_lock

 * @interruptible: Interruptible sleeping while waiting for a lock.

 *

 * Takes the lock in read mode.

 * Returns:

 * -ERESTARTSYS If interrupted by a signal and interruptible is true.

 */

extern int ttm_read_lock(struct ttm_lock *lock, bool interruptible);

/**

 * ttm_read_trylock

 *

 * @lock: Pointer to a struct ttm_lock

 * @interruptible: Interruptible sleeping while waiting for a lock.

 *

 * Tries to take the lock in read mode. If the lock is already held

 * in write mode, the function will return -EBUSY. If the lock is held

 * in vt or suspend mode, the function will sleep until these modes

 * are unlocked.

 *

 * Returns:

 * -EBUSY The lock was already held in write mode.

 * -ERESTARTSYS If interrupted by a signal and interruptible is true.

 */

extern int ttm_read_trylock(struct ttm_lock *lock, bool interruptible);

/**

 * ttm_write_unlock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Releases a write lock.

 */

extern void ttm_write_unlock(struct ttm_lock *lock);

/**

 * ttm_write_lock

 *

 * @lock: Pointer to a struct ttm_lock

 * @interruptible: Interruptible sleeping while waiting for a lock.

 *

 * Takes the lock in write mode.

 * Returns:

 * -ERESTARTSYS If interrupted by a signal and interruptible is true.

 */

extern int ttm_write_lock(struct ttm_lock *lock, bool interruptible);

/**

 * ttm_lock_downgrade

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Downgrades a write lock to a read lock.

 */

extern void ttm_lock_downgrade(struct ttm_lock *lock);

/**

 * ttm_suspend_lock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Takes the lock in suspend mode. Excludes read and write mode.

 */

extern void ttm_suspend_lock(struct ttm_lock *lock);

/**

 * ttm_suspend_unlock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Releases a suspend lock

 */

extern void ttm_suspend_unlock(struct ttm_lock *lock);

/**

 * ttm_vt_lock

 *

 * @lock: Pointer to a struct ttm_lock

 * @interruptible: Interruptible sleeping while waiting for a lock.

 * @tfile: Pointer to a struct ttm_object_file to register the lock with.

 *

 * Takes the lock in vt mode.

 * Returns:

 * -ERESTARTSYS If interrupted by a signal and interruptible is true.

 * -ENOMEM: Out of memory when locking.

 */

extern int ttm_vt_lock(struct ttm_lock *lock, bool interruptible,

		       struct ttm_object_file *tfile);

/**

 * ttm_vt_unlock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Releases a vt lock.

 * Returns:

 * -EINVAL If the lock was not held.

 */

extern int ttm_vt_unlock(struct ttm_lock *lock);

/**

 * ttm_write_unlock

 *

 * @lock: Pointer to a struct ttm_lock

 *

 * Releases a write lock.

 */

extern void ttm_write_unlock(struct ttm_lock *lock);

/**

 * ttm_write_lock

 *

 * @lock: Pointer to a struct ttm_lock

 * @interruptible: Interruptible sleeping while waiting for a lock.

 *

 * Takes the lock in write mode.

 * Returns:

 * -ERESTARTSYS If interrupted by a signal and interruptible is true.

 */

extern int ttm_write_lock(struct ttm_lock *lock, bool interruptible);

#endif

	int ret;

	uint32_t new_flags;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);

		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);

err:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

	int ret;

	uint32_t new_flags;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);

	ttm_bo_unreserve(bo);

err:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

	placement.num_busy_placement = 1;

	placement.busy_placement = &place;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);

	if (unlikely(ret != 0))

	ttm_bo_unreserve(bo);

err_unlock:

	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;

}

	struct ttm_buffer_object *bo = &buf->base;

	int ret;

	ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);

	if (unlikely(ret != 0))

		return ret;

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);

	if (unlikely(ret != 0))

		goto err;

	ttm_bo_unreserve(bo);

err:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

	uint32_t handle;

	int ret;

	ret = ttm_read_lock(&dev_priv->reservation_sem, true);

	if (unlikely(ret != 0))

		return ret;

	ret = vmw_user_bo_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,

				req->size, false, &handle, &vbo,

				NULL);

	vmw_bo_unreference(&vbo);

out_no_bo:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

	args->pitch = args->width * ((args->bpp + 7) / 8);

	args->size = args->pitch * args->height;

	ret = ttm_read_lock(&dev_priv->reservation_sem, true);

	if (unlikely(ret != 0))

		return ret;

	ret = vmw_user_bo_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,

				    args->size, false, &args->handle,

				    &vbo, NULL);

	vmw_bo_unreference(&vbo);

out_no_bo:

	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;

}

		  ((dev_priv->has_mob) ? vmw_cmdbuf_res_man_size() : 0) +

		  + VMW_IDA_ACC_SIZE + TTM_OBJ_EXTRA_SIZE;

	ret = ttm_read_lock(&dev_priv->reservation_sem, true);

	if (unlikely(ret != 0))

		return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),

				   vmw_user_context_size,

				   &ttm_opt_ctx);

		if (ret != -ERESTARTSYS)

			DRM_ERROR("Out of graphics memory for context"

				  " creation.\n");

		goto out_unlock;

		goto out_ret;

	}

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);

		ttm_mem_global_free(vmw_mem_glob(dev_priv),

				    vmw_user_context_size);

		ret = -ENOMEM;

		goto out_unlock;

		goto out_ret;

	}

	res = &ctx->res;

	ret = vmw_context_init(dev_priv, res, vmw_user_context_free, dx);

	if (unlikely(ret != 0))

		goto out_unlock;

		goto out_ret;

	tmp = vmw_resource_reference(&ctx->res);

	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,

	arg->cid = ctx->base.handle;

out_err:

	vmw_resource_unreference(&res);

out_unlock:

	ttm_read_unlock(&dev_priv->reservation_sem);

out_ret:

	return ret;

}