+++ /dev/null
-/*
- * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
- * Copyright (C) 2007 The Regents of the University of California.
- * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
- * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
- * UCRL-CODE-235197
- *
- * This file is part of the SPL, Solaris Porting Layer.
- * For details, see <http://zfsonlinux.org/>.
- *
- * The SPL is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * The SPL is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with the SPL. If not, see <http://www.gnu.org/licenses/>.
- *****************************************************************************
- * Solaris Porting LAyer Tests (SPLAT) Read/Writer Lock Tests.
- */
-
-#include <sys/random.h>
-#include <sys/rwlock.h>
-#include <sys/taskq.h>
-#include <linux/delay.h>
-#include <linux/mm_compat.h>
-#include "splat-internal.h"
-
-#define SPLAT_RWLOCK_NAME "rwlock"
-#define SPLAT_RWLOCK_DESC "Kernel RW Lock Tests"
-
-#define SPLAT_RWLOCK_TEST1_ID 0x0701
-#define SPLAT_RWLOCK_TEST1_NAME "N-rd/1-wr"
-#define SPLAT_RWLOCK_TEST1_DESC "Multiple readers one writer"
-
-#define SPLAT_RWLOCK_TEST2_ID 0x0702
-#define SPLAT_RWLOCK_TEST2_NAME "0-rd/N-wr"
-#define SPLAT_RWLOCK_TEST2_DESC "Multiple writers"
-
-#define SPLAT_RWLOCK_TEST3_ID 0x0703
-#define SPLAT_RWLOCK_TEST3_NAME "held"
-#define SPLAT_RWLOCK_TEST3_DESC "RW_{LOCK|READ|WRITE}_HELD"
-
-#define SPLAT_RWLOCK_TEST4_ID 0x0704
-#define SPLAT_RWLOCK_TEST4_NAME "tryenter"
-#define SPLAT_RWLOCK_TEST4_DESC "Tryenter"
-
-#define SPLAT_RWLOCK_TEST5_ID 0x0705
-#define SPLAT_RWLOCK_TEST5_NAME "rw_downgrade"
-#define SPLAT_RWLOCK_TEST5_DESC "Write downgrade"
-
-#define SPLAT_RWLOCK_TEST6_ID 0x0706
-#define SPLAT_RWLOCK_TEST6_NAME "rw_tryupgrade-1"
-#define SPLAT_RWLOCK_TEST6_DESC "rwsem->count value"
-
-#define SPLAT_RWLOCK_TEST7_ID 0x0707
-#define SPLAT_RWLOCK_TEST7_NAME "rw_tryupgrade-2"
-#define SPLAT_RWLOCK_TEST7_DESC "Read upgrade"
-
-#define SPLAT_RWLOCK_TEST_MAGIC 0x115599DDUL
-#define SPLAT_RWLOCK_TEST_NAME "rwlock_test"
-#define SPLAT_RWLOCK_TEST_TASKQ "rwlock_taskq"
-#define SPLAT_RWLOCK_TEST_COUNT 8
-
-#define SPLAT_RWLOCK_RELEASE_INIT 0
-#define SPLAT_RWLOCK_RELEASE_WR 1
-#define SPLAT_RWLOCK_RELEASE_RD 2
-
-typedef struct rw_priv {
- unsigned long rw_magic;
- struct file *rw_file;
- krwlock_t rw_rwlock;
- spinlock_t rw_lock;
- spl_wait_queue_head_t rw_waitq;
- int rw_completed;
- int rw_holders;
- int rw_waiters;
- int rw_release;
- int rw_rc;
- krw_t rw_type;
-} rw_priv_t;
-
-typedef struct rw_thr {
- const char *rwt_name;
- rw_priv_t *rwt_rwp;
- struct task_struct *rwt_thread;
-} rw_thr_t;
-
-void splat_init_rw_priv(rw_priv_t *rwp, struct file *file)
-{
- rwp->rw_magic = SPLAT_RWLOCK_TEST_MAGIC;
- rwp->rw_file = file;
- rw_init(&rwp->rw_rwlock, SPLAT_RWLOCK_TEST_NAME, RW_DEFAULT, NULL);
- spin_lock_init(&rwp->rw_lock);
- init_waitqueue_head(&rwp->rw_waitq);
- rwp->rw_completed = 0;
- rwp->rw_holders = 0;
- rwp->rw_waiters = 0;
- rwp->rw_release = SPLAT_RWLOCK_RELEASE_INIT;
- rwp->rw_rc = 0;
- rwp->rw_type = 0;
-}
-
-#if defined(CONFIG_PREEMPT_RT_FULL)
-static int
-splat_rwlock_test1(struct file *file, void *arg)
-{
- /*
- * This test will never succeed on PREEMPT_RT_FULL because these
- * kernels only allow a single thread to hold the lock.
- */
- return 0;
-}
-#else
-static int
-splat_rwlock_wr_thr(void *arg)
-{
- rw_thr_t *rwt = (rw_thr_t *)arg;
- rw_priv_t *rwp = rwt->rwt_rwp;
- uint8_t rnd;
-
- ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
-
- get_random_bytes((void *)&rnd, 1);
- msleep((unsigned int)rnd);
-
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s trying to acquire rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
- spin_lock(&rwp->rw_lock);
- rwp->rw_waiters++;
- spin_unlock(&rwp->rw_lock);
- rw_enter(&rwp->rw_rwlock, RW_WRITER);
-
- spin_lock(&rwp->rw_lock);
- rwp->rw_waiters--;
- rwp->rw_holders++;
- spin_unlock(&rwp->rw_lock);
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s acquired rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
-
- /* Wait for control thread to signal we can release the write lock */
- wait_event_interruptible(rwp->rw_waitq, splat_locked_test(&rwp->rw_lock,
- rwp->rw_release == SPLAT_RWLOCK_RELEASE_WR));
-
- spin_lock(&rwp->rw_lock);
- rwp->rw_completed++;
- rwp->rw_holders--;
- spin_unlock(&rwp->rw_lock);
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s dropped rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
-
- rw_exit(&rwp->rw_rwlock);
-
- return 0;
-}
-
-static int
-splat_rwlock_rd_thr(void *arg)
-{
- rw_thr_t *rwt = (rw_thr_t *)arg;
- rw_priv_t *rwp = rwt->rwt_rwp;
- uint8_t rnd;
-
- ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
-
- get_random_bytes((void *)&rnd, 1);
- msleep((unsigned int)rnd);
-
- /* Don't try and take the semaphore until after someone has it */
- wait_event_interruptible(rwp->rw_waitq,
- splat_locked_test(&rwp->rw_lock, rwp->rw_holders > 0));
-
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s trying to acquire rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
- spin_lock(&rwp->rw_lock);
- rwp->rw_waiters++;
- spin_unlock(&rwp->rw_lock);
- rw_enter(&rwp->rw_rwlock, RW_READER);
-
- spin_lock(&rwp->rw_lock);
- rwp->rw_waiters--;
- rwp->rw_holders++;
- spin_unlock(&rwp->rw_lock);
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s acquired rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
-
- /* Wait for control thread to signal we can release the read lock */
- wait_event_interruptible(rwp->rw_waitq, splat_locked_test(&rwp->rw_lock,
- rwp->rw_release == SPLAT_RWLOCK_RELEASE_RD));
-
- spin_lock(&rwp->rw_lock);
- rwp->rw_completed++;
- rwp->rw_holders--;
- spin_unlock(&rwp->rw_lock);
- splat_vprint(rwp->rw_file, rwt->rwt_name,
- "%s dropped rwlock (%d holding/%d waiting)\n",
- rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
-
- rw_exit(&rwp->rw_rwlock);
-
- return 0;
-}
-
-static int
-splat_rwlock_test1(struct file *file, void *arg)
-{
- int i, count = 0, rc = 0;
- rw_thr_t rwt[SPLAT_RWLOCK_TEST_COUNT];
- rw_priv_t *rwp;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- /* Create some threads, the exact number isn't important just as
- * long as we know how many we managed to create and should expect. */
- for (i = 0; i < SPLAT_RWLOCK_TEST_COUNT; i++) {
- rwt[i].rwt_rwp = rwp;
- rwt[i].rwt_name = SPLAT_RWLOCK_TEST1_NAME;
-
- /* The first thread will be the writer */
- if (i == 0)
- rwt[i].rwt_thread = spl_kthread_create(splat_rwlock_wr_thr,
- &rwt[i], "%s/%d", SPLAT_RWLOCK_TEST_NAME, i);
- else
- rwt[i].rwt_thread = spl_kthread_create(splat_rwlock_rd_thr,
- &rwt[i], "%s/%d", SPLAT_RWLOCK_TEST_NAME, i);
-
- if (!IS_ERR(rwt[i].rwt_thread)) {
- wake_up_process(rwt[i].rwt_thread);
- count++;
- }
- }
-
- /* Wait for the writer */
- while (splat_locked_test(&rwp->rw_lock, rwp->rw_holders == 0)) {
- wake_up_interruptible(&rwp->rw_waitq);
- msleep(100);
- }
-
- /* Wait for 'count-1' readers */
- while (splat_locked_test(&rwp->rw_lock, rwp->rw_waiters < count - 1)) {
- wake_up_interruptible(&rwp->rw_waitq);
- msleep(100);
- }
-
- /* Verify there is only one lock holder */
- if (splat_locked_test(&rwp->rw_lock, rwp->rw_holders) != 1) {
- splat_vprint(file, SPLAT_RWLOCK_TEST1_NAME, "Only 1 holder "
- "expected for rwlock (%d holding/%d waiting)\n",
- rwp->rw_holders, rwp->rw_waiters);
- rc = -EINVAL;
- }
-
- /* Verify 'count-1' readers */
- if (splat_locked_test(&rwp->rw_lock, rwp->rw_waiters != count - 1)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST1_NAME, "Only %d waiters "
- "expected for rwlock (%d holding/%d waiting)\n",
- count - 1, rwp->rw_holders, rwp->rw_waiters);
- rc = -EINVAL;
- }
-
- /* Signal the writer to release, allows readers to acquire */
- spin_lock(&rwp->rw_lock);
- rwp->rw_release = SPLAT_RWLOCK_RELEASE_WR;
- wake_up_interruptible(&rwp->rw_waitq);
- spin_unlock(&rwp->rw_lock);
-
- /* Wait for 'count-1' readers to hold the lock */
- while (splat_locked_test(&rwp->rw_lock, rwp->rw_holders < count - 1)) {
- wake_up_interruptible(&rwp->rw_waitq);
- msleep(100);
- }
-
- /* Verify there are 'count-1' readers */
- if (splat_locked_test(&rwp->rw_lock, rwp->rw_holders != count - 1)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST1_NAME, "Only %d holders "
- "expected for rwlock (%d holding/%d waiting)\n",
- count - 1, rwp->rw_holders, rwp->rw_waiters);
- rc = -EINVAL;
- }
-
- /* Release 'count-1' readers */
- spin_lock(&rwp->rw_lock);
- rwp->rw_release = SPLAT_RWLOCK_RELEASE_RD;
- wake_up_interruptible(&rwp->rw_waitq);
- spin_unlock(&rwp->rw_lock);
-
- /* Wait for the test to complete */
- while (splat_locked_test(&rwp->rw_lock,
- rwp->rw_holders>0 || rwp->rw_waiters>0))
- msleep(100);
-
- rw_destroy(&(rwp->rw_rwlock));
- kfree(rwp);
-
- return rc;
-}
-#endif
-
-static void
-splat_rwlock_test2_func(void *arg)
-{
- rw_priv_t *rwp = (rw_priv_t *)arg;
- int rc;
- ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
-
- /* Read the value before sleeping and write it after we wake up to
- * maximize the chance of a race if rwlocks are not working properly */
- rw_enter(&rwp->rw_rwlock, RW_WRITER);
- rc = rwp->rw_rc;
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(HZ / 100); /* 1/100 of a second */
- VERIFY(rwp->rw_rc == rc);
- rwp->rw_rc = rc + 1;
- rw_exit(&rwp->rw_rwlock);
-}
-
-static int
-splat_rwlock_test2(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- taskq_t *tq;
- int i, rc = 0, tq_count = 256;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- /* Create several threads allowing tasks to race with each other */
- tq = taskq_create(SPLAT_RWLOCK_TEST_TASKQ, num_online_cpus(),
- defclsyspri, 50, INT_MAX, TASKQ_PREPOPULATE);
- if (tq == NULL) {
- rc = -ENOMEM;
- goto out;
- }
-
- /*
- * Schedule N work items to the work queue each of which enters the
- * writer rwlock, sleeps briefly, then exits the writer rwlock. On a
- * multiprocessor box these work items will be handled by all available
- * CPUs. The task function checks to ensure the tracked shared variable
- * is always only incremented by one. Additionally, the rwlock itself
- * is instrumented such that if any two processors are in the
- * critical region at the same time the system will panic. If the
- * rwlock is implemented right this will never happy, that's a pass.
- */
- for (i = 0; i < tq_count; i++) {
- if (taskq_dispatch(tq, splat_rwlock_test2_func, rwp,
- TQ_SLEEP) == TASKQID_INVALID) {
- splat_vprint(file, SPLAT_RWLOCK_TEST2_NAME,
- "Failed to queue task %d\n", i);
- rc = -EINVAL;
- }
- }
-
- taskq_wait(tq);
-
- if (rwp->rw_rc == tq_count) {
- splat_vprint(file, SPLAT_RWLOCK_TEST2_NAME, "%d racing threads "
- "correctly entered/exited the rwlock %d times\n",
- num_online_cpus(), rwp->rw_rc);
- } else {
- splat_vprint(file, SPLAT_RWLOCK_TEST2_NAME, "%d racing threads "
- "only processed %d/%d w rwlock work items\n",
- num_online_cpus(), rwp->rw_rc, tq_count);
- rc = -EINVAL;
- }
-
- taskq_destroy(tq);
- rw_destroy(&(rwp->rw_rwlock));
-out:
- kfree(rwp);
- return rc;
-}
-
-#define splat_rwlock_test3_helper(rwp,rex1,rex2,wex1,wex2,held_func,rc) \
-do { \
- int result, _rc1_, _rc2_, _rc3_, _rc4_; \
- \
- rc = 0; \
- rw_enter(&(rwp)->rw_rwlock, RW_READER); \
- _rc1_ = ((result = held_func(&(rwp)->rw_rwlock)) != rex1); \
- splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
- " returned %d (expected %d) when RW_READER\n", \
- _rc1_ ? "Fail " : "", result, rex1); \
- rw_exit(&(rwp)->rw_rwlock); \
- _rc2_ = ((result = held_func(&(rwp)->rw_rwlock)) != rex2); \
- splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
- " returned %d (expected %d) when !RW_READER\n", \
- _rc2_ ? "Fail " : "", result, rex2); \
- \
- rw_enter(&(rwp)->rw_rwlock, RW_WRITER); \
- _rc3_ = ((result = held_func(&(rwp)->rw_rwlock)) != wex1); \
- splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
- " returned %d (expected %d) when RW_WRITER\n", \
- _rc3_ ? "Fail " : "", result, wex1); \
- rw_exit(&(rwp)->rw_rwlock); \
- _rc4_ = ((result = held_func(&(rwp)->rw_rwlock)) != wex2); \
- splat_vprint(file, SPLAT_RWLOCK_TEST3_NAME, "%s" #held_func \
- " returned %d (expected %d) when !RW_WRITER\n", \
- _rc4_ ? "Fail " : "", result, wex2); \
- \
- rc = ((_rc1_ || _rc2_ || _rc3_ || _rc4_) ? -EINVAL : 0); \
-} while(0);
-
-static int
-splat_rwlock_test3(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- int rc1, rc2, rc3;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- splat_rwlock_test3_helper(rwp, 1, 0, 1, 0, RW_LOCK_HELD, rc1);
- splat_rwlock_test3_helper(rwp, 1, 0, 0, 0, RW_READ_HELD, rc2);
- splat_rwlock_test3_helper(rwp, 0, 0, 1, 0, RW_WRITE_HELD, rc3);
-
- rw_destroy(&rwp->rw_rwlock);
- kfree(rwp);
-
- return ((rc1 || rc2 || rc3) ? -EINVAL : 0);
-}
-
-static void
-splat_rwlock_test4_func(void *arg)
-{
- rw_priv_t *rwp = (rw_priv_t *)arg;
- ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
-
- if (rw_tryenter(&rwp->rw_rwlock, rwp->rw_type)) {
- rwp->rw_rc = 0;
- rw_exit(&rwp->rw_rwlock);
- } else {
- rwp->rw_rc = -EBUSY;
- }
-}
-
-static char *
-splat_rwlock_test4_name(krw_t type)
-{
- switch (type) {
- case RW_NONE: return "RW_NONE";
- case RW_WRITER: return "RW_WRITER";
- case RW_READER: return "RW_READER";
- }
-
- return NULL;
-}
-
-static int
-splat_rwlock_test4_type(taskq_t *tq, rw_priv_t *rwp, int expected_rc,
- krw_t holder_type, krw_t try_type)
-{
- int id, rc = 0;
-
- /* Schedule a task function which will try and acquire the rwlock
- * using type try_type while the rwlock is being held as holder_type.
- * The result must match expected_rc for the test to pass */
- rwp->rw_rc = -EINVAL;
- rwp->rw_type = try_type;
-
- if (holder_type == RW_WRITER || holder_type == RW_READER)
- rw_enter(&rwp->rw_rwlock, holder_type);
-
- id = taskq_dispatch(tq, splat_rwlock_test4_func, rwp, TQ_SLEEP);
- if (id == TASKQID_INVALID) {
- splat_vprint(rwp->rw_file, SPLAT_RWLOCK_TEST4_NAME, "%s",
- "taskq_dispatch() failed\n");
- rc = -EINVAL;
- goto out;
- }
-
- taskq_wait_id(tq, id);
-
- if (rwp->rw_rc != expected_rc)
- rc = -EINVAL;
-
- splat_vprint(rwp->rw_file, SPLAT_RWLOCK_TEST4_NAME,
- "%srw_tryenter(%s) returned %d (expected %d) when %s\n",
- rc ? "Fail " : "", splat_rwlock_test4_name(try_type),
- rwp->rw_rc, expected_rc,
- splat_rwlock_test4_name(holder_type));
-out:
- if (holder_type == RW_WRITER || holder_type == RW_READER)
- rw_exit(&rwp->rw_rwlock);
-
- return rc;
-}
-
-static int
-splat_rwlock_test4(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- taskq_t *tq;
- int rc = 0, rc1, rc2, rc3, rc4, rc5, rc6;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- tq = taskq_create(SPLAT_RWLOCK_TEST_TASKQ, 1, defclsyspri,
- 50, INT_MAX, TASKQ_PREPOPULATE);
- if (tq == NULL) {
- rc = -ENOMEM;
- goto out;
- }
-
- splat_init_rw_priv(rwp, file);
-
- /*
- * Validate all combinations of rw_tryenter() contention.
- *
- * The concurrent reader test is modified for PREEMPT_RT_FULL
- * kernels which do not permit concurrent read locks to be taken
- * from different threads. The same thread is allowed to take
- * the read lock multiple times.
- */
- rc1 = splat_rwlock_test4_type(tq, rwp, -EBUSY, RW_WRITER, RW_WRITER);
- rc2 = splat_rwlock_test4_type(tq, rwp, -EBUSY, RW_WRITER, RW_READER);
- rc3 = splat_rwlock_test4_type(tq, rwp, -EBUSY, RW_READER, RW_WRITER);
-#if defined(CONFIG_PREEMPT_RT_FULL)
- rc4 = splat_rwlock_test4_type(tq, rwp, -EBUSY, RW_READER, RW_READER);
-#else
- rc4 = splat_rwlock_test4_type(tq, rwp, 0, RW_READER, RW_READER);
-#endif
- rc5 = splat_rwlock_test4_type(tq, rwp, 0, RW_NONE, RW_WRITER);
- rc6 = splat_rwlock_test4_type(tq, rwp, 0, RW_NONE, RW_READER);
-
- if (rc1 || rc2 || rc3 || rc4 || rc5 || rc6)
- rc = -EINVAL;
-
- taskq_destroy(tq);
-out:
- rw_destroy(&(rwp->rw_rwlock));
- kfree(rwp);
-
- return rc;
-}
-
-static int
-splat_rwlock_test5(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- int rc = -EINVAL;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- rw_enter(&rwp->rw_rwlock, RW_WRITER);
- if (!RW_WRITE_HELD(&rwp->rw_rwlock)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST5_NAME,
- "rwlock should be write lock: %d\n",
- RW_WRITE_HELD(&rwp->rw_rwlock));
- goto out;
- }
-
- rw_downgrade(&rwp->rw_rwlock);
- if (!RW_READ_HELD(&rwp->rw_rwlock)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST5_NAME,
- "rwlock should be read lock: %d\n",
- RW_READ_HELD(&rwp->rw_rwlock));
- goto out;
- }
-
- rc = 0;
- splat_vprint(file, SPLAT_RWLOCK_TEST5_NAME, "%s",
- "rwlock properly downgraded\n");
-out:
- rw_exit(&rwp->rw_rwlock);
- rw_destroy(&rwp->rw_rwlock);
- kfree(rwp);
-
- return rc;
-}
-
-static int
-splat_rwlock_test6(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- int rc;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- rw_enter(&rwp->rw_rwlock, RW_READER);
- if (RWSEM_COUNT(SEM(&rwp->rw_rwlock)) !=
- SPL_RWSEM_SINGLE_READER_VALUE) {
- splat_vprint(file, SPLAT_RWLOCK_TEST6_NAME,
- "We assumed single reader rwsem->count "
- "should be %ld, but is %ld\n",
- (long int)SPL_RWSEM_SINGLE_READER_VALUE,
- (long int)RWSEM_COUNT(SEM(&rwp->rw_rwlock)));
- rc = -ENOLCK;
- goto out;
- }
- rw_exit(&rwp->rw_rwlock);
-
- rw_enter(&rwp->rw_rwlock, RW_WRITER);
- if (RWSEM_COUNT(SEM(&rwp->rw_rwlock)) !=
- SPL_RWSEM_SINGLE_WRITER_VALUE) {
- splat_vprint(file, SPLAT_RWLOCK_TEST6_NAME,
- "We assumed single writer rwsem->count "
- "should be %ld, but is %ld\n",
- (long int)SPL_RWSEM_SINGLE_WRITER_VALUE,
- (long int)RWSEM_COUNT(SEM(&rwp->rw_rwlock)));
- rc = -ENOLCK;
- goto out;
- }
- rc = 0;
- splat_vprint(file, SPLAT_RWLOCK_TEST6_NAME, "%s",
- "rwsem->count same as we assumed\n");
-out:
- rw_exit(&rwp->rw_rwlock);
- rw_destroy(&rwp->rw_rwlock);
- kfree(rwp);
-
- return rc;
-}
-
-static int
-splat_rwlock_test7(struct file *file, void *arg)
-{
- rw_priv_t *rwp;
- int rc;
-
- rwp = (rw_priv_t *)kmalloc(sizeof(*rwp), GFP_KERNEL);
- if (rwp == NULL)
- return -ENOMEM;
-
- splat_init_rw_priv(rwp, file);
-
- rw_enter(&rwp->rw_rwlock, RW_READER);
- if (!RW_READ_HELD(&rwp->rw_rwlock)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST7_NAME,
- "rwlock should be read lock: %d\n",
- RW_READ_HELD(&rwp->rw_rwlock));
- rc = -ENOLCK;
- goto out;
- }
-
- /* With one reader upgrade should never fail. */
- rc = rw_tryupgrade(&rwp->rw_rwlock);
- if (!rc) {
- splat_vprint(file, SPLAT_RWLOCK_TEST7_NAME,
- "rwlock failed upgrade from reader: %d\n",
- RW_READ_HELD(&rwp->rw_rwlock));
- rc = -ENOLCK;
- goto out;
- }
-
- if (RW_READ_HELD(&rwp->rw_rwlock) || !RW_WRITE_HELD(&rwp->rw_rwlock)) {
- splat_vprint(file, SPLAT_RWLOCK_TEST7_NAME, "rwlock should "
- "have 0 (not %d) reader and 1 (not %d) writer\n",
- RW_READ_HELD(&rwp->rw_rwlock),
- RW_WRITE_HELD(&rwp->rw_rwlock));
- goto out;
- }
-
- rc = 0;
- splat_vprint(file, SPLAT_RWLOCK_TEST7_NAME, "%s",
- "rwlock properly upgraded\n");
-out:
- rw_exit(&rwp->rw_rwlock);
- rw_destroy(&rwp->rw_rwlock);
- kfree(rwp);
-
- return rc;
-}
-
-splat_subsystem_t *
-splat_rwlock_init(void)
-{
- splat_subsystem_t *sub;
-
- sub = kmalloc(sizeof(*sub), GFP_KERNEL);
- if (sub == NULL)
- return NULL;
-
- memset(sub, 0, sizeof(*sub));
- strncpy(sub->desc.name, SPLAT_RWLOCK_NAME, SPLAT_NAME_SIZE);
- strncpy(sub->desc.desc, SPLAT_RWLOCK_DESC, SPLAT_DESC_SIZE);
- INIT_LIST_HEAD(&sub->subsystem_list);
- INIT_LIST_HEAD(&sub->test_list);
- spin_lock_init(&sub->test_lock);
- sub->desc.id = SPLAT_SUBSYSTEM_RWLOCK;
-
- splat_test_init(sub, SPLAT_RWLOCK_TEST1_NAME, SPLAT_RWLOCK_TEST1_DESC,
- SPLAT_RWLOCK_TEST1_ID, splat_rwlock_test1);
- splat_test_init(sub, SPLAT_RWLOCK_TEST2_NAME, SPLAT_RWLOCK_TEST2_DESC,
- SPLAT_RWLOCK_TEST2_ID, splat_rwlock_test2);
- splat_test_init(sub, SPLAT_RWLOCK_TEST3_NAME, SPLAT_RWLOCK_TEST3_DESC,
- SPLAT_RWLOCK_TEST3_ID, splat_rwlock_test3);
- splat_test_init(sub, SPLAT_RWLOCK_TEST4_NAME, SPLAT_RWLOCK_TEST4_DESC,
- SPLAT_RWLOCK_TEST4_ID, splat_rwlock_test4);
- splat_test_init(sub, SPLAT_RWLOCK_TEST5_NAME, SPLAT_RWLOCK_TEST5_DESC,
- SPLAT_RWLOCK_TEST5_ID, splat_rwlock_test5);
- splat_test_init(sub, SPLAT_RWLOCK_TEST6_NAME, SPLAT_RWLOCK_TEST6_DESC,
- SPLAT_RWLOCK_TEST6_ID, splat_rwlock_test6);
- splat_test_init(sub, SPLAT_RWLOCK_TEST7_NAME, SPLAT_RWLOCK_TEST7_DESC,
- SPLAT_RWLOCK_TEST7_ID, splat_rwlock_test7);
-
- return sub;
-}
-
-void
-splat_rwlock_fini(splat_subsystem_t *sub)
-{
- ASSERT(sub);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST7_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST6_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST5_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST4_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST3_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST2_ID);
- splat_test_fini(sub, SPLAT_RWLOCK_TEST1_ID);
- kfree(sub);
-}
-
-int
-splat_rwlock_id(void) {
- return SPLAT_SUBSYSTEM_RWLOCK;
-}
projects / mirror_spl.git / blobdiff