/************************************************************************** * * 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 */ /** @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 #include #include /** * 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. * @kill_takers: Boolean whether to kill takers of the lock. * @signal: Signal to send when kill_takers is true. */ struct ttm_lock { struct ttm_base_object base; wait_queue_head_t queue; spinlock_t lock; int32_t rw; uint32_t flags; bool kill_takers; int signal; struct ttm_object_file *vt_holder; }; /** * 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); /** * ttm_lock_set_kill * * @lock: Pointer to a struct ttm_lock * @val: Boolean whether to kill processes taking the lock. * @signal: Signal to send to the process taking the lock. * * The kill-when-taking-lock functionality is used to kill processes that keep * on using the TTM functionality when its resources has been taken down, for * example when the X server exits. A typical sequence would look like this: * - X server takes lock in write mode. * - ttm_lock_set_kill() is called with @val set to true. * - As part of X server exit, TTM resources are taken down. * - X server releases the lock on file release. * - Another dri client wants to render, takes the lock and is killed. * */ static inline void ttm_lock_set_kill(struct ttm_lock *lock, bool val, int signal) { lock->kill_takers = val; if (val) lock->signal = signal; } #endif fd7f6c38beaaf581514b706d07c7aec0'>plain -rw-r--r--bcm21664.h1984logplain -rw-r--r--bcm281xx.h2456logplain -rw-r--r--bcm2835-aux.h635logplain -rw-r--r--bcm2835.h1962logplain -rw-r--r--berlin2.h1034logplain -rw-r--r--berlin2q.h695logplain -rw-r--r--clps711x-clock.h718logplain -rw-r--r--efm32-cmu.h1112logplain -rw-r--r--exynos-audss-clk.h597logplain -rw-r--r--exynos3250.h9083logplain -rw-r--r--exynos4.h8284logplain -rw-r--r--exynos4415.h9828logplain -rw-r--r--exynos5250.h4616logplain -rw-r--r--exynos5260-clk.h14876logplain -rw-r--r--exynos5410.h1689logplain -rw-r--r--exynos5420.h6857logplain -rw-r--r--exynos5433.h45372logplain -rw-r--r--exynos5440.h1141logplain -rw-r--r--exynos7-clk.h5281logplain -rw-r--r--gxbb-aoclkc.h2866logplain -rw-r--r--gxbb-clkc.h592logplain -rw-r--r--hi3516cv300-clock.h1668logplain -rw-r--r--hi3519-clock.h1328logplain -rw-r--r--hi3620-clock.h4496logplain -rw-r--r--hi6220-clock.h4508logplain -rw-r--r--hip04-clock.h1137logplain -rw-r--r--histb-clock.h2012logplain -rw-r--r--hix5hd2-clock.h2415logplain -rw-r--r--imx1-clock.h1055logplain -rw-r--r--imx21-clock.h2461logplain -rw-r--r--imx27-clock.h3494logplain -rw-r--r--imx5-clock.h7212logplain -rw-r--r--imx6qdl-clock.h9593logplain -rw-r--r--imx6sl-clock.h5849logplain -rw-r--r--imx6sx-clock.h9099logplain -rw-r--r--imx6ul-clock.h8203logplain -rw-r--r--imx7d-clock.h15974logplain -rw-r--r--jz4740-cgu.h1028logplain -rw-r--r--jz4780-cgu.h2470logplain -rw-r--r--lpc18xx-ccu.h2134logplain -rw-r--r--lpc18xx-cgu.h1142logplain -rw-r--r--lpc32xx-clock.h1633logplain -rw-r--r--lsi,axm5516-clks.h974logplain -rw-r--r--marvell,mmp2.h2022logplain -rw-r--r--marvell,pxa168.h1654logplain -rw-r--r--marvell,pxa1928.h1535logplain -rw-r--r--marvell,pxa910.h1598logplain -rw-r--r--maxim,max77620.h632logplain -rw-r--r--maxim,max77686.h648logplain -rw-r--r--maxim,max77802.h630logplain -rw-r--r--meson8b-clkc.h523logplain -rw-r--r--microchip,pic32-clock.h1150logplain -rw-r--r--mpc512x-clock.h2236logplain -rw-r--r--mt2701-clk.h13832logplain -rw-r--r--mt8135-clk.h5641logplain -rw-r--r--mt8173-clk.h9293logplain -rw-r--r--oxsemi,ox810se.h1002logplain -rw-r--r--oxsemi,ox820.h1203logplain -rw-r--r--pistachio-clk.h4863logplain -rw-r--r--pxa-clock.h1715logplain -rw-r--r--qcom,gcc-apq8084.h12872logplain -rw-r--r--qcom,gcc-ipq4019.h5423logplain -rw-r--r--qcom,gcc-ipq806x.h8574logplain -rw-r--r--qcom,gcc-mdm9615.h9497logplain -rw-r--r--qcom,gcc-msm8660.h7932logplain -rw-r--r--qcom,gcc-msm8916.h6190logplain -rw-r--r--qcom,gcc-msm8960.h9342logplain -rw-r--r--qcom,gcc-msm8974.h12340logplain -rw-r--r--qcom,gcc-msm8994.h4858logplain -rw-r--r--qcom,gcc-msm8996.h12575logplain -rw-r--r--qcom,lcc-ipq806x.h899logplain -rw-r--r--qcom,lcc-mdm9615.h1701logplain -rw-r--r--qcom,lcc-msm8960.h1616logplain -rw-r--r--qcom,mmcc-apq8084.h5722logplain -rw-r--r--qcom,mmcc-msm8960.h4109logplain -rw-r--r--qcom,mmcc-msm8974.h5223logplain -rw-r--r--qcom,mmcc-msm8996.h9403logplain -rw-r--r--qcom,rpmcc.h2101logplain -rw-r--r--r7s72100-clock.h1218logplain -rw-r--r--r8a73a4-clock.h1596logplain -rw-r--r--r8a7740-clock.h1992logplain -rw-r--r--r8a7743-cpg-mssr.h1269logplain -rw-r--r--r8a7745-cpg-mssr.h1298logplain -rw-r--r--r8a7778-clock.h1855logplain -rw-r--r--r8a7779-clock.h1647logplain -rw-r--r--r8a7790-clock.h4367logplain -rw-r--r--r8a7791-clock.h4388logplain -rw-r--r--r8a7792-clock.h2562logplain -rw-r--r--r8a7793-clock.h4561logplain -rw-r--r--r8a7794-clock.h3679logplain -rw-r--r--r8a7795-cpg-mssr.h1890logplain -rw-r--r--r8a7796-cpg-mssr.h2066logplain -rw-r--r--renesas-cpg-mssr.h542logplain -rw-r--r--rk1108-cru.h6605logplain -rw-r--r--rk3036-cru.h4584logplain -rw-r--r--rk3066a-cru.h1068logplain -rw-r--r--rk3188-cru-common.h6105logplain -rw-r--r--rk3188-cru.h1435logplain