forked from Minki/linux
125966db1f
Problem: $ cat /sys/kernel/config/target/core/user_0/block/attrib/qfull_time_out -1 $ echo "-1" > /sys/kernel/config/target/core/user_0/block/attrib/qfull_time_out -bash: echo: write error: Invalid argument Fix: This patch will help reset qfull_time_out to its default i.e. qfull_time_out=-1. Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com> Acked-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2559 lines
64 KiB
C
2559 lines
64 KiB
C
/*
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* Copyright (C) 2013 Shaohua Li <shli@kernel.org>
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* Copyright (C) 2014 Red Hat, Inc.
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* Copyright (C) 2015 Arrikto, Inc.
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* Copyright (C) 2017 Chinamobile, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/parser.h>
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#include <linux/vmalloc.h>
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#include <linux/uio_driver.h>
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#include <linux/radix-tree.h>
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#include <linux/stringify.h>
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#include <linux/bitops.h>
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#include <linux/highmem.h>
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#include <linux/configfs.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <net/genetlink.h>
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#include <scsi/scsi_common.h>
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#include <scsi/scsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include <target/target_core_backend.h>
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#include <linux/target_core_user.h>
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/*
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* Define a shared-memory interface for LIO to pass SCSI commands and
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* data to userspace for processing. This is to allow backends that
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* are too complex for in-kernel support to be possible.
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*
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* It uses the UIO framework to do a lot of the device-creation and
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* introspection work for us.
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*
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* See the .h file for how the ring is laid out. Note that while the
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* command ring is defined, the particulars of the data area are
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* not. Offset values in the command entry point to other locations
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* internal to the mmap()ed area. There is separate space outside the
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* command ring for data buffers. This leaves maximum flexibility for
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* moving buffer allocations, or even page flipping or other
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* allocation techniques, without altering the command ring layout.
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*
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* SECURITY:
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* The user process must be assumed to be malicious. There's no way to
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* prevent it breaking the command ring protocol if it wants, but in
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* order to prevent other issues we must only ever read *data* from
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* the shared memory area, not offsets or sizes. This applies to
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* command ring entries as well as the mailbox. Extra code needed for
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* this may have a 'UAM' comment.
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*/
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#define TCMU_TIME_OUT (30 * MSEC_PER_SEC)
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/* For cmd area, the size is fixed 8MB */
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#define CMDR_SIZE (8 * 1024 * 1024)
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/*
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* For data area, the block size is PAGE_SIZE and
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* the total size is 256K * PAGE_SIZE.
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*/
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#define DATA_BLOCK_SIZE PAGE_SIZE
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#define DATA_BLOCK_SHIFT PAGE_SHIFT
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#define DATA_BLOCK_BITS_DEF (256 * 1024)
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#define DATA_SIZE (DATA_BLOCK_BITS * DATA_BLOCK_SIZE)
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#define TCMU_MBS_TO_BLOCKS(_mbs) (_mbs << (20 - DATA_BLOCK_SHIFT))
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#define TCMU_BLOCKS_TO_MBS(_blocks) (_blocks >> (20 - DATA_BLOCK_SHIFT))
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/* The total size of the ring is 8M + 256K * PAGE_SIZE */
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#define TCMU_RING_SIZE (CMDR_SIZE + DATA_SIZE)
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/*
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* Default number of global data blocks(512K * PAGE_SIZE)
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* when the unmap thread will be started.
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*/
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#define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024)
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static u8 tcmu_kern_cmd_reply_supported;
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static struct device *tcmu_root_device;
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struct tcmu_hba {
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u32 host_id;
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};
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#define TCMU_CONFIG_LEN 256
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struct tcmu_nl_cmd {
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/* wake up thread waiting for reply */
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struct completion complete;
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int cmd;
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int status;
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};
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struct tcmu_dev {
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struct list_head node;
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struct kref kref;
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struct se_device se_dev;
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char *name;
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struct se_hba *hba;
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#define TCMU_DEV_BIT_OPEN 0
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#define TCMU_DEV_BIT_BROKEN 1
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#define TCMU_DEV_BIT_BLOCKED 2
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unsigned long flags;
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struct uio_info uio_info;
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struct inode *inode;
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struct tcmu_mailbox *mb_addr;
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size_t dev_size;
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u32 cmdr_size;
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u32 cmdr_last_cleaned;
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/* Offset of data area from start of mb */
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/* Must add data_off and mb_addr to get the address */
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size_t data_off;
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size_t data_size;
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uint32_t max_blocks;
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size_t ring_size;
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struct mutex cmdr_lock;
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struct list_head cmdr_queue;
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uint32_t dbi_max;
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uint32_t dbi_thresh;
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unsigned long *data_bitmap;
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struct radix_tree_root data_blocks;
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struct idr commands;
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struct timer_list cmd_timer;
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unsigned int cmd_time_out;
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struct timer_list qfull_timer;
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int qfull_time_out;
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struct list_head timedout_entry;
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spinlock_t nl_cmd_lock;
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struct tcmu_nl_cmd curr_nl_cmd;
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/* wake up threads waiting on curr_nl_cmd */
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wait_queue_head_t nl_cmd_wq;
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char dev_config[TCMU_CONFIG_LEN];
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int nl_reply_supported;
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};
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#define TCMU_DEV(_se_dev) container_of(_se_dev, struct tcmu_dev, se_dev)
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#define CMDR_OFF sizeof(struct tcmu_mailbox)
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struct tcmu_cmd {
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struct se_cmd *se_cmd;
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struct tcmu_dev *tcmu_dev;
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struct list_head cmdr_queue_entry;
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uint16_t cmd_id;
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/* Can't use se_cmd when cleaning up expired cmds, because if
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cmd has been completed then accessing se_cmd is off limits */
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uint32_t dbi_cnt;
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uint32_t dbi_cur;
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uint32_t *dbi;
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unsigned long deadline;
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#define TCMU_CMD_BIT_EXPIRED 0
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unsigned long flags;
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};
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/*
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* To avoid dead lock the mutex lock order should always be:
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*
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* mutex_lock(&root_udev_mutex);
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* ...
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* mutex_lock(&tcmu_dev->cmdr_lock);
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* mutex_unlock(&tcmu_dev->cmdr_lock);
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* ...
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* mutex_unlock(&root_udev_mutex);
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*/
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static DEFINE_MUTEX(root_udev_mutex);
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static LIST_HEAD(root_udev);
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static DEFINE_SPINLOCK(timed_out_udevs_lock);
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static LIST_HEAD(timed_out_udevs);
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static struct kmem_cache *tcmu_cmd_cache;
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static atomic_t global_db_count = ATOMIC_INIT(0);
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static struct delayed_work tcmu_unmap_work;
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static int tcmu_global_max_blocks = TCMU_GLOBAL_MAX_BLOCKS_DEF;
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static int tcmu_set_global_max_data_area(const char *str,
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const struct kernel_param *kp)
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{
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int ret, max_area_mb;
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ret = kstrtoint(str, 10, &max_area_mb);
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if (ret)
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return -EINVAL;
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if (max_area_mb <= 0) {
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pr_err("global_max_data_area must be larger than 0.\n");
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return -EINVAL;
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}
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tcmu_global_max_blocks = TCMU_MBS_TO_BLOCKS(max_area_mb);
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if (atomic_read(&global_db_count) > tcmu_global_max_blocks)
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schedule_delayed_work(&tcmu_unmap_work, 0);
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else
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cancel_delayed_work_sync(&tcmu_unmap_work);
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return 0;
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}
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static int tcmu_get_global_max_data_area(char *buffer,
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const struct kernel_param *kp)
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{
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return sprintf(buffer, "%d", TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks));
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}
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static const struct kernel_param_ops tcmu_global_max_data_area_op = {
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.set = tcmu_set_global_max_data_area,
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.get = tcmu_get_global_max_data_area,
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};
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module_param_cb(global_max_data_area_mb, &tcmu_global_max_data_area_op, NULL,
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S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(global_max_data_area_mb,
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"Max MBs allowed to be allocated to all the tcmu device's "
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"data areas.");
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/* multicast group */
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enum tcmu_multicast_groups {
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TCMU_MCGRP_CONFIG,
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};
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static const struct genl_multicast_group tcmu_mcgrps[] = {
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[TCMU_MCGRP_CONFIG] = { .name = "config", },
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};
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static struct nla_policy tcmu_attr_policy[TCMU_ATTR_MAX+1] = {
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[TCMU_ATTR_DEVICE] = { .type = NLA_STRING },
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[TCMU_ATTR_MINOR] = { .type = NLA_U32 },
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[TCMU_ATTR_CMD_STATUS] = { .type = NLA_S32 },
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[TCMU_ATTR_DEVICE_ID] = { .type = NLA_U32 },
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[TCMU_ATTR_SUPP_KERN_CMD_REPLY] = { .type = NLA_U8 },
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};
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static int tcmu_genl_cmd_done(struct genl_info *info, int completed_cmd)
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{
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struct se_device *dev;
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struct tcmu_dev *udev;
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struct tcmu_nl_cmd *nl_cmd;
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int dev_id, rc, ret = 0;
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bool is_removed = (completed_cmd == TCMU_CMD_REMOVED_DEVICE);
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if (!info->attrs[TCMU_ATTR_CMD_STATUS] ||
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!info->attrs[TCMU_ATTR_DEVICE_ID]) {
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printk(KERN_ERR "TCMU_ATTR_CMD_STATUS or TCMU_ATTR_DEVICE_ID not set, doing nothing\n");
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return -EINVAL;
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}
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dev_id = nla_get_u32(info->attrs[TCMU_ATTR_DEVICE_ID]);
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rc = nla_get_s32(info->attrs[TCMU_ATTR_CMD_STATUS]);
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dev = target_find_device(dev_id, !is_removed);
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if (!dev) {
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printk(KERN_ERR "tcmu nl cmd %u/%u completion could not find device with dev id %u.\n",
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completed_cmd, rc, dev_id);
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return -ENODEV;
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}
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udev = TCMU_DEV(dev);
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spin_lock(&udev->nl_cmd_lock);
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nl_cmd = &udev->curr_nl_cmd;
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pr_debug("genl cmd done got id %d curr %d done %d rc %d\n", dev_id,
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nl_cmd->cmd, completed_cmd, rc);
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if (nl_cmd->cmd != completed_cmd) {
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printk(KERN_ERR "Mismatched commands (Expecting reply for %d. Current %d).\n",
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completed_cmd, nl_cmd->cmd);
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ret = -EINVAL;
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} else {
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nl_cmd->status = rc;
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}
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spin_unlock(&udev->nl_cmd_lock);
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if (!is_removed)
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target_undepend_item(&dev->dev_group.cg_item);
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if (!ret)
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complete(&nl_cmd->complete);
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return ret;
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}
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static int tcmu_genl_rm_dev_done(struct sk_buff *skb, struct genl_info *info)
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{
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return tcmu_genl_cmd_done(info, TCMU_CMD_REMOVED_DEVICE);
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}
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static int tcmu_genl_add_dev_done(struct sk_buff *skb, struct genl_info *info)
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{
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return tcmu_genl_cmd_done(info, TCMU_CMD_ADDED_DEVICE);
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}
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static int tcmu_genl_reconfig_dev_done(struct sk_buff *skb,
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struct genl_info *info)
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{
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return tcmu_genl_cmd_done(info, TCMU_CMD_RECONFIG_DEVICE);
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}
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static int tcmu_genl_set_features(struct sk_buff *skb, struct genl_info *info)
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{
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if (info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]) {
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tcmu_kern_cmd_reply_supported =
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nla_get_u8(info->attrs[TCMU_ATTR_SUPP_KERN_CMD_REPLY]);
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printk(KERN_INFO "tcmu daemon: command reply support %u.\n",
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tcmu_kern_cmd_reply_supported);
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}
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return 0;
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}
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static const struct genl_ops tcmu_genl_ops[] = {
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{
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.cmd = TCMU_CMD_SET_FEATURES,
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.flags = GENL_ADMIN_PERM,
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.policy = tcmu_attr_policy,
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.doit = tcmu_genl_set_features,
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},
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{
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.cmd = TCMU_CMD_ADDED_DEVICE_DONE,
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.flags = GENL_ADMIN_PERM,
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.policy = tcmu_attr_policy,
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.doit = tcmu_genl_add_dev_done,
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},
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{
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.cmd = TCMU_CMD_REMOVED_DEVICE_DONE,
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.flags = GENL_ADMIN_PERM,
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.policy = tcmu_attr_policy,
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.doit = tcmu_genl_rm_dev_done,
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},
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{
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.cmd = TCMU_CMD_RECONFIG_DEVICE_DONE,
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.flags = GENL_ADMIN_PERM,
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.policy = tcmu_attr_policy,
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.doit = tcmu_genl_reconfig_dev_done,
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},
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};
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/* Our generic netlink family */
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static struct genl_family tcmu_genl_family __ro_after_init = {
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.module = THIS_MODULE,
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.hdrsize = 0,
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.name = "TCM-USER",
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.version = 2,
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.maxattr = TCMU_ATTR_MAX,
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.mcgrps = tcmu_mcgrps,
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.n_mcgrps = ARRAY_SIZE(tcmu_mcgrps),
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.netnsok = true,
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.ops = tcmu_genl_ops,
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.n_ops = ARRAY_SIZE(tcmu_genl_ops),
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};
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#define tcmu_cmd_set_dbi_cur(cmd, index) ((cmd)->dbi_cur = (index))
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#define tcmu_cmd_reset_dbi_cur(cmd) tcmu_cmd_set_dbi_cur(cmd, 0)
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#define tcmu_cmd_set_dbi(cmd, index) ((cmd)->dbi[(cmd)->dbi_cur++] = (index))
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#define tcmu_cmd_get_dbi(cmd) ((cmd)->dbi[(cmd)->dbi_cur++])
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static void tcmu_cmd_free_data(struct tcmu_cmd *tcmu_cmd, uint32_t len)
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{
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struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
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uint32_t i;
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for (i = 0; i < len; i++)
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clear_bit(tcmu_cmd->dbi[i], udev->data_bitmap);
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}
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static inline bool tcmu_get_empty_block(struct tcmu_dev *udev,
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struct tcmu_cmd *tcmu_cmd)
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{
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struct page *page;
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int ret, dbi;
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dbi = find_first_zero_bit(udev->data_bitmap, udev->dbi_thresh);
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if (dbi == udev->dbi_thresh)
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return false;
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page = radix_tree_lookup(&udev->data_blocks, dbi);
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if (!page) {
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if (atomic_add_return(1, &global_db_count) >
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tcmu_global_max_blocks)
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schedule_delayed_work(&tcmu_unmap_work, 0);
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|
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/* try to get new page from the mm */
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page = alloc_page(GFP_KERNEL);
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if (!page)
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goto err_alloc;
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ret = radix_tree_insert(&udev->data_blocks, dbi, page);
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if (ret)
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goto err_insert;
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}
|
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|
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if (dbi > udev->dbi_max)
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udev->dbi_max = dbi;
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set_bit(dbi, udev->data_bitmap);
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tcmu_cmd_set_dbi(tcmu_cmd, dbi);
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return true;
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err_insert:
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__free_page(page);
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err_alloc:
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atomic_dec(&global_db_count);
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return false;
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}
|
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|
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static bool tcmu_get_empty_blocks(struct tcmu_dev *udev,
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struct tcmu_cmd *tcmu_cmd)
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{
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int i;
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for (i = tcmu_cmd->dbi_cur; i < tcmu_cmd->dbi_cnt; i++) {
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if (!tcmu_get_empty_block(udev, tcmu_cmd))
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return false;
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}
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return true;
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}
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|
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static inline struct page *
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tcmu_get_block_page(struct tcmu_dev *udev, uint32_t dbi)
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{
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return radix_tree_lookup(&udev->data_blocks, dbi);
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}
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|
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static inline void tcmu_free_cmd(struct tcmu_cmd *tcmu_cmd)
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{
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kfree(tcmu_cmd->dbi);
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kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
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}
|
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|
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static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd)
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{
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struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
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size_t data_length = round_up(se_cmd->data_length, DATA_BLOCK_SIZE);
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if (se_cmd->se_cmd_flags & SCF_BIDI) {
|
|
BUG_ON(!(se_cmd->t_bidi_data_sg && se_cmd->t_bidi_data_nents));
|
|
data_length += round_up(se_cmd->t_bidi_data_sg->length,
|
|
DATA_BLOCK_SIZE);
|
|
}
|
|
|
|
return data_length;
|
|
}
|
|
|
|
static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd)
|
|
{
|
|
size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
|
|
|
|
return data_length / DATA_BLOCK_SIZE;
|
|
}
|
|
|
|
static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct se_device *se_dev = se_cmd->se_dev;
|
|
struct tcmu_dev *udev = TCMU_DEV(se_dev);
|
|
struct tcmu_cmd *tcmu_cmd;
|
|
|
|
tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL);
|
|
if (!tcmu_cmd)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&tcmu_cmd->cmdr_queue_entry);
|
|
tcmu_cmd->se_cmd = se_cmd;
|
|
tcmu_cmd->tcmu_dev = udev;
|
|
|
|
tcmu_cmd_reset_dbi_cur(tcmu_cmd);
|
|
tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd);
|
|
tcmu_cmd->dbi = kcalloc(tcmu_cmd->dbi_cnt, sizeof(uint32_t),
|
|
GFP_KERNEL);
|
|
if (!tcmu_cmd->dbi) {
|
|
kmem_cache_free(tcmu_cmd_cache, tcmu_cmd);
|
|
return NULL;
|
|
}
|
|
|
|
return tcmu_cmd;
|
|
}
|
|
|
|
static inline void tcmu_flush_dcache_range(void *vaddr, size_t size)
|
|
{
|
|
unsigned long offset = offset_in_page(vaddr);
|
|
void *start = vaddr - offset;
|
|
|
|
size = round_up(size+offset, PAGE_SIZE);
|
|
|
|
while (size) {
|
|
flush_dcache_page(virt_to_page(start));
|
|
start += PAGE_SIZE;
|
|
size -= PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Some ring helper functions. We don't assume size is a power of 2 so
|
|
* we can't use circ_buf.h.
|
|
*/
|
|
static inline size_t spc_used(size_t head, size_t tail, size_t size)
|
|
{
|
|
int diff = head - tail;
|
|
|
|
if (diff >= 0)
|
|
return diff;
|
|
else
|
|
return size + diff;
|
|
}
|
|
|
|
static inline size_t spc_free(size_t head, size_t tail, size_t size)
|
|
{
|
|
/* Keep 1 byte unused or we can't tell full from empty */
|
|
return (size - spc_used(head, tail, size) - 1);
|
|
}
|
|
|
|
static inline size_t head_to_end(size_t head, size_t size)
|
|
{
|
|
return size - head;
|
|
}
|
|
|
|
static inline void new_iov(struct iovec **iov, int *iov_cnt)
|
|
{
|
|
struct iovec *iovec;
|
|
|
|
if (*iov_cnt != 0)
|
|
(*iov)++;
|
|
(*iov_cnt)++;
|
|
|
|
iovec = *iov;
|
|
memset(iovec, 0, sizeof(struct iovec));
|
|
}
|
|
|
|
#define UPDATE_HEAD(head, used, size) smp_store_release(&head, ((head % size) + used) % size)
|
|
|
|
/* offset is relative to mb_addr */
|
|
static inline size_t get_block_offset_user(struct tcmu_dev *dev,
|
|
int dbi, int remaining)
|
|
{
|
|
return dev->data_off + dbi * DATA_BLOCK_SIZE +
|
|
DATA_BLOCK_SIZE - remaining;
|
|
}
|
|
|
|
static inline size_t iov_tail(struct iovec *iov)
|
|
{
|
|
return (size_t)iov->iov_base + iov->iov_len;
|
|
}
|
|
|
|
static void scatter_data_area(struct tcmu_dev *udev,
|
|
struct tcmu_cmd *tcmu_cmd, struct scatterlist *data_sg,
|
|
unsigned int data_nents, struct iovec **iov,
|
|
int *iov_cnt, bool copy_data)
|
|
{
|
|
int i, dbi;
|
|
int block_remaining = 0;
|
|
void *from, *to = NULL;
|
|
size_t copy_bytes, to_offset, offset;
|
|
struct scatterlist *sg;
|
|
struct page *page;
|
|
|
|
for_each_sg(data_sg, sg, data_nents, i) {
|
|
int sg_remaining = sg->length;
|
|
from = kmap_atomic(sg_page(sg)) + sg->offset;
|
|
while (sg_remaining > 0) {
|
|
if (block_remaining == 0) {
|
|
if (to)
|
|
kunmap_atomic(to);
|
|
|
|
block_remaining = DATA_BLOCK_SIZE;
|
|
dbi = tcmu_cmd_get_dbi(tcmu_cmd);
|
|
page = tcmu_get_block_page(udev, dbi);
|
|
to = kmap_atomic(page);
|
|
}
|
|
|
|
/*
|
|
* Covert to virtual offset of the ring data area.
|
|
*/
|
|
to_offset = get_block_offset_user(udev, dbi,
|
|
block_remaining);
|
|
|
|
/*
|
|
* The following code will gather and map the blocks
|
|
* to the same iovec when the blocks are all next to
|
|
* each other.
|
|
*/
|
|
copy_bytes = min_t(size_t, sg_remaining,
|
|
block_remaining);
|
|
if (*iov_cnt != 0 &&
|
|
to_offset == iov_tail(*iov)) {
|
|
/*
|
|
* Will append to the current iovec, because
|
|
* the current block page is next to the
|
|
* previous one.
|
|
*/
|
|
(*iov)->iov_len += copy_bytes;
|
|
} else {
|
|
/*
|
|
* Will allocate a new iovec because we are
|
|
* first time here or the current block page
|
|
* is not next to the previous one.
|
|
*/
|
|
new_iov(iov, iov_cnt);
|
|
(*iov)->iov_base = (void __user *)to_offset;
|
|
(*iov)->iov_len = copy_bytes;
|
|
}
|
|
|
|
if (copy_data) {
|
|
offset = DATA_BLOCK_SIZE - block_remaining;
|
|
memcpy(to + offset,
|
|
from + sg->length - sg_remaining,
|
|
copy_bytes);
|
|
tcmu_flush_dcache_range(to, copy_bytes);
|
|
}
|
|
|
|
sg_remaining -= copy_bytes;
|
|
block_remaining -= copy_bytes;
|
|
}
|
|
kunmap_atomic(from - sg->offset);
|
|
}
|
|
|
|
if (to)
|
|
kunmap_atomic(to);
|
|
}
|
|
|
|
static void gather_data_area(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
|
|
bool bidi)
|
|
{
|
|
struct se_cmd *se_cmd = cmd->se_cmd;
|
|
int i, dbi;
|
|
int block_remaining = 0;
|
|
void *from = NULL, *to;
|
|
size_t copy_bytes, offset;
|
|
struct scatterlist *sg, *data_sg;
|
|
struct page *page;
|
|
unsigned int data_nents;
|
|
uint32_t count = 0;
|
|
|
|
if (!bidi) {
|
|
data_sg = se_cmd->t_data_sg;
|
|
data_nents = se_cmd->t_data_nents;
|
|
} else {
|
|
|
|
/*
|
|
* For bidi case, the first count blocks are for Data-Out
|
|
* buffer blocks, and before gathering the Data-In buffer
|
|
* the Data-Out buffer blocks should be discarded.
|
|
*/
|
|
count = DIV_ROUND_UP(se_cmd->data_length, DATA_BLOCK_SIZE);
|
|
|
|
data_sg = se_cmd->t_bidi_data_sg;
|
|
data_nents = se_cmd->t_bidi_data_nents;
|
|
}
|
|
|
|
tcmu_cmd_set_dbi_cur(cmd, count);
|
|
|
|
for_each_sg(data_sg, sg, data_nents, i) {
|
|
int sg_remaining = sg->length;
|
|
to = kmap_atomic(sg_page(sg)) + sg->offset;
|
|
while (sg_remaining > 0) {
|
|
if (block_remaining == 0) {
|
|
if (from)
|
|
kunmap_atomic(from);
|
|
|
|
block_remaining = DATA_BLOCK_SIZE;
|
|
dbi = tcmu_cmd_get_dbi(cmd);
|
|
page = tcmu_get_block_page(udev, dbi);
|
|
from = kmap_atomic(page);
|
|
}
|
|
copy_bytes = min_t(size_t, sg_remaining,
|
|
block_remaining);
|
|
offset = DATA_BLOCK_SIZE - block_remaining;
|
|
tcmu_flush_dcache_range(from, copy_bytes);
|
|
memcpy(to + sg->length - sg_remaining, from + offset,
|
|
copy_bytes);
|
|
|
|
sg_remaining -= copy_bytes;
|
|
block_remaining -= copy_bytes;
|
|
}
|
|
kunmap_atomic(to - sg->offset);
|
|
}
|
|
if (from)
|
|
kunmap_atomic(from);
|
|
}
|
|
|
|
static inline size_t spc_bitmap_free(unsigned long *bitmap, uint32_t thresh)
|
|
{
|
|
return thresh - bitmap_weight(bitmap, thresh);
|
|
}
|
|
|
|
/*
|
|
* We can't queue a command until we have space available on the cmd ring *and*
|
|
* space available on the data area.
|
|
*
|
|
* Called with ring lock held.
|
|
*/
|
|
static bool is_ring_space_avail(struct tcmu_dev *udev, struct tcmu_cmd *cmd,
|
|
size_t cmd_size, size_t data_needed)
|
|
{
|
|
struct tcmu_mailbox *mb = udev->mb_addr;
|
|
uint32_t blocks_needed = (data_needed + DATA_BLOCK_SIZE - 1)
|
|
/ DATA_BLOCK_SIZE;
|
|
size_t space, cmd_needed;
|
|
u32 cmd_head;
|
|
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
|
|
cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
|
|
|
|
/*
|
|
* If cmd end-of-ring space is too small then we need space for a NOP plus
|
|
* original cmd - cmds are internally contiguous.
|
|
*/
|
|
if (head_to_end(cmd_head, udev->cmdr_size) >= cmd_size)
|
|
cmd_needed = cmd_size;
|
|
else
|
|
cmd_needed = cmd_size + head_to_end(cmd_head, udev->cmdr_size);
|
|
|
|
space = spc_free(cmd_head, udev->cmdr_last_cleaned, udev->cmdr_size);
|
|
if (space < cmd_needed) {
|
|
pr_debug("no cmd space: %u %u %u\n", cmd_head,
|
|
udev->cmdr_last_cleaned, udev->cmdr_size);
|
|
return false;
|
|
}
|
|
|
|
/* try to check and get the data blocks as needed */
|
|
space = spc_bitmap_free(udev->data_bitmap, udev->dbi_thresh);
|
|
if ((space * DATA_BLOCK_SIZE) < data_needed) {
|
|
unsigned long blocks_left =
|
|
(udev->max_blocks - udev->dbi_thresh) + space;
|
|
|
|
if (blocks_left < blocks_needed) {
|
|
pr_debug("no data space: only %lu available, but ask for %zu\n",
|
|
blocks_left * DATA_BLOCK_SIZE,
|
|
data_needed);
|
|
return false;
|
|
}
|
|
|
|
udev->dbi_thresh += blocks_needed;
|
|
if (udev->dbi_thresh > udev->max_blocks)
|
|
udev->dbi_thresh = udev->max_blocks;
|
|
}
|
|
|
|
return tcmu_get_empty_blocks(udev, cmd);
|
|
}
|
|
|
|
static inline size_t tcmu_cmd_get_base_cmd_size(size_t iov_cnt)
|
|
{
|
|
return max(offsetof(struct tcmu_cmd_entry, req.iov[iov_cnt]),
|
|
sizeof(struct tcmu_cmd_entry));
|
|
}
|
|
|
|
static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd,
|
|
size_t base_command_size)
|
|
{
|
|
struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
|
|
size_t command_size;
|
|
|
|
command_size = base_command_size +
|
|
round_up(scsi_command_size(se_cmd->t_task_cdb),
|
|
TCMU_OP_ALIGN_SIZE);
|
|
|
|
WARN_ON(command_size & (TCMU_OP_ALIGN_SIZE-1));
|
|
|
|
return command_size;
|
|
}
|
|
|
|
static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd, unsigned int tmo,
|
|
struct timer_list *timer)
|
|
{
|
|
struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
|
|
int cmd_id;
|
|
|
|
if (tcmu_cmd->cmd_id)
|
|
goto setup_timer;
|
|
|
|
cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT);
|
|
if (cmd_id < 0) {
|
|
pr_err("tcmu: Could not allocate cmd id.\n");
|
|
return cmd_id;
|
|
}
|
|
tcmu_cmd->cmd_id = cmd_id;
|
|
|
|
pr_debug("allocated cmd %u for dev %s tmo %lu\n", tcmu_cmd->cmd_id,
|
|
udev->name, tmo / MSEC_PER_SEC);
|
|
|
|
setup_timer:
|
|
if (!tmo)
|
|
return 0;
|
|
|
|
tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo));
|
|
mod_timer(timer, tcmu_cmd->deadline);
|
|
return 0;
|
|
}
|
|
|
|
static int add_to_cmdr_queue(struct tcmu_cmd *tcmu_cmd)
|
|
{
|
|
struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
|
|
unsigned int tmo;
|
|
int ret;
|
|
|
|
/*
|
|
* For backwards compat if qfull_time_out is not set use
|
|
* cmd_time_out and if that's not set use the default time out.
|
|
*/
|
|
if (!udev->qfull_time_out)
|
|
return -ETIMEDOUT;
|
|
else if (udev->qfull_time_out > 0)
|
|
tmo = udev->qfull_time_out;
|
|
else if (udev->cmd_time_out)
|
|
tmo = udev->cmd_time_out;
|
|
else
|
|
tmo = TCMU_TIME_OUT;
|
|
|
|
ret = tcmu_setup_cmd_timer(tcmu_cmd, tmo, &udev->qfull_timer);
|
|
if (ret)
|
|
return ret;
|
|
|
|
list_add_tail(&tcmu_cmd->cmdr_queue_entry, &udev->cmdr_queue);
|
|
pr_debug("adding cmd %u on dev %s to ring space wait queue\n",
|
|
tcmu_cmd->cmd_id, udev->name);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* queue_cmd_ring - queue cmd to ring or internally
|
|
* @tcmu_cmd: cmd to queue
|
|
* @scsi_err: TCM error code if failure (-1) returned.
|
|
*
|
|
* Returns:
|
|
* -1 we cannot queue internally or to the ring.
|
|
* 0 success
|
|
* 1 internally queued to wait for ring memory to free.
|
|
*/
|
|
static sense_reason_t queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, int *scsi_err)
|
|
{
|
|
struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
|
|
struct se_cmd *se_cmd = tcmu_cmd->se_cmd;
|
|
size_t base_command_size, command_size;
|
|
struct tcmu_mailbox *mb;
|
|
struct tcmu_cmd_entry *entry;
|
|
struct iovec *iov;
|
|
int iov_cnt, ret;
|
|
uint32_t cmd_head;
|
|
uint64_t cdb_off;
|
|
bool copy_to_data_area;
|
|
size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
|
|
|
|
*scsi_err = TCM_NO_SENSE;
|
|
|
|
if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags)) {
|
|
*scsi_err = TCM_LUN_BUSY;
|
|
return -1;
|
|
}
|
|
|
|
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) {
|
|
*scsi_err = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Must be a certain minimum size for response sense info, but
|
|
* also may be larger if the iov array is large.
|
|
*
|
|
* We prepare as many iovs as possbile for potential uses here,
|
|
* because it's expensive to tell how many regions are freed in
|
|
* the bitmap & global data pool, as the size calculated here
|
|
* will only be used to do the checks.
|
|
*
|
|
* The size will be recalculated later as actually needed to save
|
|
* cmd area memories.
|
|
*/
|
|
base_command_size = tcmu_cmd_get_base_cmd_size(tcmu_cmd->dbi_cnt);
|
|
command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
|
|
|
|
if (!list_empty(&udev->cmdr_queue))
|
|
goto queue;
|
|
|
|
mb = udev->mb_addr;
|
|
cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
|
|
if ((command_size > (udev->cmdr_size / 2)) ||
|
|
data_length > udev->data_size) {
|
|
pr_warn("TCMU: Request of size %zu/%zu is too big for %u/%zu "
|
|
"cmd ring/data area\n", command_size, data_length,
|
|
udev->cmdr_size, udev->data_size);
|
|
*scsi_err = TCM_INVALID_CDB_FIELD;
|
|
return -1;
|
|
}
|
|
|
|
if (!is_ring_space_avail(udev, tcmu_cmd, command_size, data_length)) {
|
|
/*
|
|
* Don't leave commands partially setup because the unmap
|
|
* thread might need the blocks to make forward progress.
|
|
*/
|
|
tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cur);
|
|
tcmu_cmd_reset_dbi_cur(tcmu_cmd);
|
|
goto queue;
|
|
}
|
|
|
|
/* Insert a PAD if end-of-ring space is too small */
|
|
if (head_to_end(cmd_head, udev->cmdr_size) < command_size) {
|
|
size_t pad_size = head_to_end(cmd_head, udev->cmdr_size);
|
|
|
|
entry = (void *) mb + CMDR_OFF + cmd_head;
|
|
tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_PAD);
|
|
tcmu_hdr_set_len(&entry->hdr.len_op, pad_size);
|
|
entry->hdr.cmd_id = 0; /* not used for PAD */
|
|
entry->hdr.kflags = 0;
|
|
entry->hdr.uflags = 0;
|
|
tcmu_flush_dcache_range(entry, sizeof(*entry));
|
|
|
|
UPDATE_HEAD(mb->cmd_head, pad_size, udev->cmdr_size);
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
|
|
cmd_head = mb->cmd_head % udev->cmdr_size; /* UAM */
|
|
WARN_ON(cmd_head != 0);
|
|
}
|
|
|
|
entry = (void *) mb + CMDR_OFF + cmd_head;
|
|
memset(entry, 0, command_size);
|
|
tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD);
|
|
|
|
/* Handle allocating space from the data area */
|
|
tcmu_cmd_reset_dbi_cur(tcmu_cmd);
|
|
iov = &entry->req.iov[0];
|
|
iov_cnt = 0;
|
|
copy_to_data_area = (se_cmd->data_direction == DMA_TO_DEVICE
|
|
|| se_cmd->se_cmd_flags & SCF_BIDI);
|
|
scatter_data_area(udev, tcmu_cmd, se_cmd->t_data_sg,
|
|
se_cmd->t_data_nents, &iov, &iov_cnt,
|
|
copy_to_data_area);
|
|
entry->req.iov_cnt = iov_cnt;
|
|
|
|
/* Handle BIDI commands */
|
|
iov_cnt = 0;
|
|
if (se_cmd->se_cmd_flags & SCF_BIDI) {
|
|
iov++;
|
|
scatter_data_area(udev, tcmu_cmd, se_cmd->t_bidi_data_sg,
|
|
se_cmd->t_bidi_data_nents, &iov, &iov_cnt,
|
|
false);
|
|
}
|
|
entry->req.iov_bidi_cnt = iov_cnt;
|
|
|
|
ret = tcmu_setup_cmd_timer(tcmu_cmd, udev->cmd_time_out,
|
|
&udev->cmd_timer);
|
|
if (ret) {
|
|
tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
*scsi_err = TCM_OUT_OF_RESOURCES;
|
|
return -1;
|
|
}
|
|
entry->hdr.cmd_id = tcmu_cmd->cmd_id;
|
|
|
|
/*
|
|
* Recalaulate the command's base size and size according
|
|
* to the actual needs
|
|
*/
|
|
base_command_size = tcmu_cmd_get_base_cmd_size(entry->req.iov_cnt +
|
|
entry->req.iov_bidi_cnt);
|
|
command_size = tcmu_cmd_get_cmd_size(tcmu_cmd, base_command_size);
|
|
|
|
tcmu_hdr_set_len(&entry->hdr.len_op, command_size);
|
|
|
|
/* All offsets relative to mb_addr, not start of entry! */
|
|
cdb_off = CMDR_OFF + cmd_head + base_command_size;
|
|
memcpy((void *) mb + cdb_off, se_cmd->t_task_cdb, scsi_command_size(se_cmd->t_task_cdb));
|
|
entry->req.cdb_off = cdb_off;
|
|
tcmu_flush_dcache_range(entry, sizeof(*entry));
|
|
|
|
UPDATE_HEAD(mb->cmd_head, command_size, udev->cmdr_size);
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
|
|
/* TODO: only if FLUSH and FUA? */
|
|
uio_event_notify(&udev->uio_info);
|
|
|
|
return 0;
|
|
|
|
queue:
|
|
if (add_to_cmdr_queue(tcmu_cmd)) {
|
|
*scsi_err = TCM_OUT_OF_RESOURCES;
|
|
return -1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static sense_reason_t
|
|
tcmu_queue_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct se_device *se_dev = se_cmd->se_dev;
|
|
struct tcmu_dev *udev = TCMU_DEV(se_dev);
|
|
struct tcmu_cmd *tcmu_cmd;
|
|
sense_reason_t scsi_ret;
|
|
int ret;
|
|
|
|
tcmu_cmd = tcmu_alloc_cmd(se_cmd);
|
|
if (!tcmu_cmd)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
mutex_lock(&udev->cmdr_lock);
|
|
ret = queue_cmd_ring(tcmu_cmd, &scsi_ret);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
if (ret < 0)
|
|
tcmu_free_cmd(tcmu_cmd);
|
|
return scsi_ret;
|
|
}
|
|
|
|
static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *entry)
|
|
{
|
|
struct se_cmd *se_cmd = cmd->se_cmd;
|
|
struct tcmu_dev *udev = cmd->tcmu_dev;
|
|
|
|
/*
|
|
* cmd has been completed already from timeout, just reclaim
|
|
* data area space and free cmd
|
|
*/
|
|
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags))
|
|
goto out;
|
|
|
|
tcmu_cmd_reset_dbi_cur(cmd);
|
|
|
|
if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) {
|
|
pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n",
|
|
cmd->se_cmd);
|
|
entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
} else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) {
|
|
transport_copy_sense_to_cmd(se_cmd, entry->rsp.sense_buffer);
|
|
} else if (se_cmd->se_cmd_flags & SCF_BIDI) {
|
|
/* Get Data-In buffer before clean up */
|
|
gather_data_area(udev, cmd, true);
|
|
} else if (se_cmd->data_direction == DMA_FROM_DEVICE) {
|
|
gather_data_area(udev, cmd, false);
|
|
} else if (se_cmd->data_direction == DMA_TO_DEVICE) {
|
|
/* TODO: */
|
|
} else if (se_cmd->data_direction != DMA_NONE) {
|
|
pr_warn("TCMU: data direction was %d!\n",
|
|
se_cmd->data_direction);
|
|
}
|
|
|
|
target_complete_cmd(cmd->se_cmd, entry->rsp.scsi_status);
|
|
|
|
out:
|
|
cmd->se_cmd = NULL;
|
|
tcmu_cmd_free_data(cmd, cmd->dbi_cnt);
|
|
tcmu_free_cmd(cmd);
|
|
}
|
|
|
|
static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
|
|
{
|
|
struct tcmu_mailbox *mb;
|
|
int handled = 0;
|
|
|
|
if (test_bit(TCMU_DEV_BIT_BROKEN, &udev->flags)) {
|
|
pr_err("ring broken, not handling completions\n");
|
|
return 0;
|
|
}
|
|
|
|
mb = udev->mb_addr;
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
|
|
while (udev->cmdr_last_cleaned != READ_ONCE(mb->cmd_tail)) {
|
|
|
|
struct tcmu_cmd_entry *entry = (void *) mb + CMDR_OFF + udev->cmdr_last_cleaned;
|
|
struct tcmu_cmd *cmd;
|
|
|
|
tcmu_flush_dcache_range(entry, sizeof(*entry));
|
|
|
|
if (tcmu_hdr_get_op(entry->hdr.len_op) == TCMU_OP_PAD) {
|
|
UPDATE_HEAD(udev->cmdr_last_cleaned,
|
|
tcmu_hdr_get_len(entry->hdr.len_op),
|
|
udev->cmdr_size);
|
|
continue;
|
|
}
|
|
WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD);
|
|
|
|
cmd = idr_remove(&udev->commands, entry->hdr.cmd_id);
|
|
if (!cmd) {
|
|
pr_err("cmd_id %u not found, ring is broken\n",
|
|
entry->hdr.cmd_id);
|
|
set_bit(TCMU_DEV_BIT_BROKEN, &udev->flags);
|
|
break;
|
|
}
|
|
|
|
tcmu_handle_completion(cmd, entry);
|
|
|
|
UPDATE_HEAD(udev->cmdr_last_cleaned,
|
|
tcmu_hdr_get_len(entry->hdr.len_op),
|
|
udev->cmdr_size);
|
|
|
|
handled++;
|
|
}
|
|
|
|
if (mb->cmd_tail == mb->cmd_head) {
|
|
/* no more pending commands */
|
|
del_timer(&udev->cmd_timer);
|
|
|
|
if (list_empty(&udev->cmdr_queue)) {
|
|
/*
|
|
* no more pending or waiting commands so try to
|
|
* reclaim blocks if needed.
|
|
*/
|
|
if (atomic_read(&global_db_count) >
|
|
tcmu_global_max_blocks)
|
|
schedule_delayed_work(&tcmu_unmap_work, 0);
|
|
}
|
|
}
|
|
|
|
return handled;
|
|
}
|
|
|
|
static int tcmu_check_expired_cmd(int id, void *p, void *data)
|
|
{
|
|
struct tcmu_cmd *cmd = p;
|
|
struct tcmu_dev *udev = cmd->tcmu_dev;
|
|
u8 scsi_status;
|
|
struct se_cmd *se_cmd;
|
|
bool is_running;
|
|
|
|
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags))
|
|
return 0;
|
|
|
|
if (!time_after(jiffies, cmd->deadline))
|
|
return 0;
|
|
|
|
is_running = list_empty(&cmd->cmdr_queue_entry);
|
|
se_cmd = cmd->se_cmd;
|
|
|
|
if (is_running) {
|
|
/*
|
|
* If cmd_time_out is disabled but qfull is set deadline
|
|
* will only reflect the qfull timeout. Ignore it.
|
|
*/
|
|
if (!udev->cmd_time_out)
|
|
return 0;
|
|
|
|
set_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags);
|
|
/*
|
|
* target_complete_cmd will translate this to LUN COMM FAILURE
|
|
*/
|
|
scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
} else {
|
|
list_del_init(&cmd->cmdr_queue_entry);
|
|
|
|
idr_remove(&udev->commands, id);
|
|
tcmu_free_cmd(cmd);
|
|
scsi_status = SAM_STAT_TASK_SET_FULL;
|
|
}
|
|
|
|
pr_debug("Timing out cmd %u on dev %s that is %s.\n",
|
|
id, udev->name, is_running ? "inflight" : "queued");
|
|
|
|
target_complete_cmd(se_cmd, scsi_status);
|
|
return 0;
|
|
}
|
|
|
|
static void tcmu_device_timedout(struct tcmu_dev *udev)
|
|
{
|
|
spin_lock(&timed_out_udevs_lock);
|
|
if (list_empty(&udev->timedout_entry))
|
|
list_add_tail(&udev->timedout_entry, &timed_out_udevs);
|
|
spin_unlock(&timed_out_udevs_lock);
|
|
|
|
schedule_delayed_work(&tcmu_unmap_work, 0);
|
|
}
|
|
|
|
static void tcmu_cmd_timedout(struct timer_list *t)
|
|
{
|
|
struct tcmu_dev *udev = from_timer(udev, t, cmd_timer);
|
|
|
|
pr_debug("%s cmd timeout has expired\n", udev->name);
|
|
tcmu_device_timedout(udev);
|
|
}
|
|
|
|
static void tcmu_qfull_timedout(struct timer_list *t)
|
|
{
|
|
struct tcmu_dev *udev = from_timer(udev, t, qfull_timer);
|
|
|
|
pr_debug("%s qfull timeout has expired\n", udev->name);
|
|
tcmu_device_timedout(udev);
|
|
}
|
|
|
|
static int tcmu_attach_hba(struct se_hba *hba, u32 host_id)
|
|
{
|
|
struct tcmu_hba *tcmu_hba;
|
|
|
|
tcmu_hba = kzalloc(sizeof(struct tcmu_hba), GFP_KERNEL);
|
|
if (!tcmu_hba)
|
|
return -ENOMEM;
|
|
|
|
tcmu_hba->host_id = host_id;
|
|
hba->hba_ptr = tcmu_hba;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tcmu_detach_hba(struct se_hba *hba)
|
|
{
|
|
kfree(hba->hba_ptr);
|
|
hba->hba_ptr = NULL;
|
|
}
|
|
|
|
static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name)
|
|
{
|
|
struct tcmu_dev *udev;
|
|
|
|
udev = kzalloc(sizeof(struct tcmu_dev), GFP_KERNEL);
|
|
if (!udev)
|
|
return NULL;
|
|
kref_init(&udev->kref);
|
|
|
|
udev->name = kstrdup(name, GFP_KERNEL);
|
|
if (!udev->name) {
|
|
kfree(udev);
|
|
return NULL;
|
|
}
|
|
|
|
udev->hba = hba;
|
|
udev->cmd_time_out = TCMU_TIME_OUT;
|
|
udev->qfull_time_out = -1;
|
|
|
|
udev->max_blocks = DATA_BLOCK_BITS_DEF;
|
|
mutex_init(&udev->cmdr_lock);
|
|
|
|
INIT_LIST_HEAD(&udev->timedout_entry);
|
|
INIT_LIST_HEAD(&udev->cmdr_queue);
|
|
idr_init(&udev->commands);
|
|
|
|
timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0);
|
|
timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0);
|
|
|
|
init_waitqueue_head(&udev->nl_cmd_wq);
|
|
spin_lock_init(&udev->nl_cmd_lock);
|
|
|
|
INIT_RADIX_TREE(&udev->data_blocks, GFP_KERNEL);
|
|
|
|
return &udev->se_dev;
|
|
}
|
|
|
|
static bool run_cmdr_queue(struct tcmu_dev *udev, bool fail)
|
|
{
|
|
struct tcmu_cmd *tcmu_cmd, *tmp_cmd;
|
|
LIST_HEAD(cmds);
|
|
bool drained = true;
|
|
sense_reason_t scsi_ret;
|
|
int ret;
|
|
|
|
if (list_empty(&udev->cmdr_queue))
|
|
return true;
|
|
|
|
pr_debug("running %s's cmdr queue forcefail %d\n", udev->name, fail);
|
|
|
|
list_splice_init(&udev->cmdr_queue, &cmds);
|
|
|
|
list_for_each_entry_safe(tcmu_cmd, tmp_cmd, &cmds, cmdr_queue_entry) {
|
|
list_del_init(&tcmu_cmd->cmdr_queue_entry);
|
|
|
|
pr_debug("removing cmd %u on dev %s from queue\n",
|
|
tcmu_cmd->cmd_id, udev->name);
|
|
|
|
if (fail) {
|
|
idr_remove(&udev->commands, tcmu_cmd->cmd_id);
|
|
/*
|
|
* We were not able to even start the command, so
|
|
* fail with busy to allow a retry in case runner
|
|
* was only temporarily down. If the device is being
|
|
* removed then LIO core will do the right thing and
|
|
* fail the retry.
|
|
*/
|
|
target_complete_cmd(tcmu_cmd->se_cmd, SAM_STAT_BUSY);
|
|
tcmu_free_cmd(tcmu_cmd);
|
|
continue;
|
|
}
|
|
|
|
ret = queue_cmd_ring(tcmu_cmd, &scsi_ret);
|
|
if (ret < 0) {
|
|
pr_debug("cmd %u on dev %s failed with %u\n",
|
|
tcmu_cmd->cmd_id, udev->name, scsi_ret);
|
|
|
|
idr_remove(&udev->commands, tcmu_cmd->cmd_id);
|
|
/*
|
|
* Ignore scsi_ret for now. target_complete_cmd
|
|
* drops it.
|
|
*/
|
|
target_complete_cmd(tcmu_cmd->se_cmd,
|
|
SAM_STAT_CHECK_CONDITION);
|
|
tcmu_free_cmd(tcmu_cmd);
|
|
} else if (ret > 0) {
|
|
pr_debug("ran out of space during cmdr queue run\n");
|
|
/*
|
|
* cmd was requeued, so just put all cmds back in
|
|
* the queue
|
|
*/
|
|
list_splice_tail(&cmds, &udev->cmdr_queue);
|
|
drained = false;
|
|
goto done;
|
|
}
|
|
}
|
|
if (list_empty(&udev->cmdr_queue))
|
|
del_timer(&udev->qfull_timer);
|
|
done:
|
|
return drained;
|
|
}
|
|
|
|
static int tcmu_irqcontrol(struct uio_info *info, s32 irq_on)
|
|
{
|
|
struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info);
|
|
|
|
mutex_lock(&udev->cmdr_lock);
|
|
tcmu_handle_completions(udev);
|
|
run_cmdr_queue(udev, false);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* mmap code from uio.c. Copied here because we want to hook mmap()
|
|
* and this stuff must come along.
|
|
*/
|
|
static int tcmu_find_mem_index(struct vm_area_struct *vma)
|
|
{
|
|
struct tcmu_dev *udev = vma->vm_private_data;
|
|
struct uio_info *info = &udev->uio_info;
|
|
|
|
if (vma->vm_pgoff < MAX_UIO_MAPS) {
|
|
if (info->mem[vma->vm_pgoff].size == 0)
|
|
return -1;
|
|
return (int)vma->vm_pgoff;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi)
|
|
{
|
|
struct page *page;
|
|
|
|
mutex_lock(&udev->cmdr_lock);
|
|
page = tcmu_get_block_page(udev, dbi);
|
|
if (likely(page)) {
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
return page;
|
|
}
|
|
|
|
/*
|
|
* Userspace messed up and passed in a address not in the
|
|
* data iov passed to it.
|
|
*/
|
|
pr_err("Invalid addr to data block mapping (dbi %u) on device %s\n",
|
|
dbi, udev->name);
|
|
page = NULL;
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
return page;
|
|
}
|
|
|
|
static int tcmu_vma_fault(struct vm_fault *vmf)
|
|
{
|
|
struct tcmu_dev *udev = vmf->vma->vm_private_data;
|
|
struct uio_info *info = &udev->uio_info;
|
|
struct page *page;
|
|
unsigned long offset;
|
|
void *addr;
|
|
|
|
int mi = tcmu_find_mem_index(vmf->vma);
|
|
if (mi < 0)
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
/*
|
|
* We need to subtract mi because userspace uses offset = N*PAGE_SIZE
|
|
* to use mem[N].
|
|
*/
|
|
offset = (vmf->pgoff - mi) << PAGE_SHIFT;
|
|
|
|
if (offset < udev->data_off) {
|
|
/* For the vmalloc()ed cmd area pages */
|
|
addr = (void *)(unsigned long)info->mem[mi].addr + offset;
|
|
page = vmalloc_to_page(addr);
|
|
} else {
|
|
uint32_t dbi;
|
|
|
|
/* For the dynamically growing data area pages */
|
|
dbi = (offset - udev->data_off) / DATA_BLOCK_SIZE;
|
|
page = tcmu_try_get_block_page(udev, dbi);
|
|
if (!page)
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
|
|
get_page(page);
|
|
vmf->page = page;
|
|
return 0;
|
|
}
|
|
|
|
static const struct vm_operations_struct tcmu_vm_ops = {
|
|
.fault = tcmu_vma_fault,
|
|
};
|
|
|
|
static int tcmu_mmap(struct uio_info *info, struct vm_area_struct *vma)
|
|
{
|
|
struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info);
|
|
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = &tcmu_vm_ops;
|
|
|
|
vma->vm_private_data = udev;
|
|
|
|
/* Ensure the mmap is exactly the right size */
|
|
if (vma_pages(vma) != (udev->ring_size >> PAGE_SHIFT))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tcmu_open(struct uio_info *info, struct inode *inode)
|
|
{
|
|
struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info);
|
|
|
|
/* O_EXCL not supported for char devs, so fake it? */
|
|
if (test_and_set_bit(TCMU_DEV_BIT_OPEN, &udev->flags))
|
|
return -EBUSY;
|
|
|
|
udev->inode = inode;
|
|
kref_get(&udev->kref);
|
|
|
|
pr_debug("open\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tcmu_dev_call_rcu(struct rcu_head *p)
|
|
{
|
|
struct se_device *dev = container_of(p, struct se_device, rcu_head);
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
|
|
kfree(udev->uio_info.name);
|
|
kfree(udev->name);
|
|
kfree(udev);
|
|
}
|
|
|
|
static int tcmu_check_and_free_pending_cmd(struct tcmu_cmd *cmd)
|
|
{
|
|
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
|
|
kmem_cache_free(tcmu_cmd_cache, cmd);
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void tcmu_blocks_release(struct radix_tree_root *blocks,
|
|
int start, int end)
|
|
{
|
|
int i;
|
|
struct page *page;
|
|
|
|
for (i = start; i < end; i++) {
|
|
page = radix_tree_delete(blocks, i);
|
|
if (page) {
|
|
__free_page(page);
|
|
atomic_dec(&global_db_count);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void tcmu_dev_kref_release(struct kref *kref)
|
|
{
|
|
struct tcmu_dev *udev = container_of(kref, struct tcmu_dev, kref);
|
|
struct se_device *dev = &udev->se_dev;
|
|
struct tcmu_cmd *cmd;
|
|
bool all_expired = true;
|
|
int i;
|
|
|
|
vfree(udev->mb_addr);
|
|
udev->mb_addr = NULL;
|
|
|
|
spin_lock_bh(&timed_out_udevs_lock);
|
|
if (!list_empty(&udev->timedout_entry))
|
|
list_del(&udev->timedout_entry);
|
|
spin_unlock_bh(&timed_out_udevs_lock);
|
|
|
|
/* Upper layer should drain all requests before calling this */
|
|
mutex_lock(&udev->cmdr_lock);
|
|
idr_for_each_entry(&udev->commands, cmd, i) {
|
|
if (tcmu_check_and_free_pending_cmd(cmd) != 0)
|
|
all_expired = false;
|
|
}
|
|
idr_destroy(&udev->commands);
|
|
WARN_ON(!all_expired);
|
|
|
|
tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1);
|
|
kfree(udev->data_bitmap);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
call_rcu(&dev->rcu_head, tcmu_dev_call_rcu);
|
|
}
|
|
|
|
static int tcmu_release(struct uio_info *info, struct inode *inode)
|
|
{
|
|
struct tcmu_dev *udev = container_of(info, struct tcmu_dev, uio_info);
|
|
|
|
clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags);
|
|
|
|
pr_debug("close\n");
|
|
/* release ref from open */
|
|
kref_put(&udev->kref, tcmu_dev_kref_release);
|
|
return 0;
|
|
}
|
|
|
|
static void tcmu_init_genl_cmd_reply(struct tcmu_dev *udev, int cmd)
|
|
{
|
|
struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd;
|
|
|
|
if (!tcmu_kern_cmd_reply_supported)
|
|
return;
|
|
|
|
if (udev->nl_reply_supported <= 0)
|
|
return;
|
|
|
|
relock:
|
|
spin_lock(&udev->nl_cmd_lock);
|
|
|
|
if (nl_cmd->cmd != TCMU_CMD_UNSPEC) {
|
|
spin_unlock(&udev->nl_cmd_lock);
|
|
pr_debug("sleeping for open nl cmd\n");
|
|
wait_event(udev->nl_cmd_wq, (nl_cmd->cmd == TCMU_CMD_UNSPEC));
|
|
goto relock;
|
|
}
|
|
|
|
memset(nl_cmd, 0, sizeof(*nl_cmd));
|
|
nl_cmd->cmd = cmd;
|
|
init_completion(&nl_cmd->complete);
|
|
|
|
spin_unlock(&udev->nl_cmd_lock);
|
|
}
|
|
|
|
static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev)
|
|
{
|
|
struct tcmu_nl_cmd *nl_cmd = &udev->curr_nl_cmd;
|
|
int ret;
|
|
DEFINE_WAIT(__wait);
|
|
|
|
if (!tcmu_kern_cmd_reply_supported)
|
|
return 0;
|
|
|
|
if (udev->nl_reply_supported <= 0)
|
|
return 0;
|
|
|
|
pr_debug("sleeping for nl reply\n");
|
|
wait_for_completion(&nl_cmd->complete);
|
|
|
|
spin_lock(&udev->nl_cmd_lock);
|
|
nl_cmd->cmd = TCMU_CMD_UNSPEC;
|
|
ret = nl_cmd->status;
|
|
nl_cmd->status = 0;
|
|
spin_unlock(&udev->nl_cmd_lock);
|
|
|
|
wake_up_all(&udev->nl_cmd_wq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd,
|
|
int reconfig_attr, const void *reconfig_data)
|
|
{
|
|
struct sk_buff *skb;
|
|
void *msg_header;
|
|
int ret = -ENOMEM;
|
|
|
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return ret;
|
|
|
|
msg_header = genlmsg_put(skb, 0, 0, &tcmu_genl_family, 0, cmd);
|
|
if (!msg_header)
|
|
goto free_skb;
|
|
|
|
ret = nla_put_string(skb, TCMU_ATTR_DEVICE, udev->uio_info.name);
|
|
if (ret < 0)
|
|
goto free_skb;
|
|
|
|
ret = nla_put_u32(skb, TCMU_ATTR_MINOR, udev->uio_info.uio_dev->minor);
|
|
if (ret < 0)
|
|
goto free_skb;
|
|
|
|
ret = nla_put_u32(skb, TCMU_ATTR_DEVICE_ID, udev->se_dev.dev_index);
|
|
if (ret < 0)
|
|
goto free_skb;
|
|
|
|
if (cmd == TCMU_CMD_RECONFIG_DEVICE) {
|
|
switch (reconfig_attr) {
|
|
case TCMU_ATTR_DEV_CFG:
|
|
ret = nla_put_string(skb, reconfig_attr, reconfig_data);
|
|
break;
|
|
case TCMU_ATTR_DEV_SIZE:
|
|
ret = nla_put_u64_64bit(skb, reconfig_attr,
|
|
*((u64 *)reconfig_data),
|
|
TCMU_ATTR_PAD);
|
|
break;
|
|
case TCMU_ATTR_WRITECACHE:
|
|
ret = nla_put_u8(skb, reconfig_attr,
|
|
*((u8 *)reconfig_data));
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
if (ret < 0)
|
|
goto free_skb;
|
|
}
|
|
|
|
genlmsg_end(skb, msg_header);
|
|
|
|
tcmu_init_genl_cmd_reply(udev, cmd);
|
|
|
|
ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0,
|
|
TCMU_MCGRP_CONFIG, GFP_KERNEL);
|
|
/* We don't care if no one is listening */
|
|
if (ret == -ESRCH)
|
|
ret = 0;
|
|
if (!ret)
|
|
ret = tcmu_wait_genl_cmd_reply(udev);
|
|
|
|
return ret;
|
|
free_skb:
|
|
nlmsg_free(skb);
|
|
return ret;
|
|
}
|
|
|
|
static int tcmu_update_uio_info(struct tcmu_dev *udev)
|
|
{
|
|
struct tcmu_hba *hba = udev->hba->hba_ptr;
|
|
struct uio_info *info;
|
|
size_t size, used;
|
|
char *str;
|
|
|
|
info = &udev->uio_info;
|
|
size = snprintf(NULL, 0, "tcm-user/%u/%s/%s", hba->host_id, udev->name,
|
|
udev->dev_config);
|
|
size += 1; /* for \0 */
|
|
str = kmalloc(size, GFP_KERNEL);
|
|
if (!str)
|
|
return -ENOMEM;
|
|
|
|
used = snprintf(str, size, "tcm-user/%u/%s", hba->host_id, udev->name);
|
|
if (udev->dev_config[0])
|
|
snprintf(str + used, size - used, "/%s", udev->dev_config);
|
|
|
|
/* If the old string exists, free it */
|
|
kfree(info->name);
|
|
info->name = str;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tcmu_configure_device(struct se_device *dev)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
struct uio_info *info;
|
|
struct tcmu_mailbox *mb;
|
|
int ret = 0;
|
|
|
|
ret = tcmu_update_uio_info(udev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
info = &udev->uio_info;
|
|
|
|
udev->data_bitmap = kzalloc(BITS_TO_LONGS(udev->max_blocks) *
|
|
sizeof(unsigned long), GFP_KERNEL);
|
|
if (!udev->data_bitmap) {
|
|
ret = -ENOMEM;
|
|
goto err_bitmap_alloc;
|
|
}
|
|
|
|
udev->mb_addr = vzalloc(CMDR_SIZE);
|
|
if (!udev->mb_addr) {
|
|
ret = -ENOMEM;
|
|
goto err_vzalloc;
|
|
}
|
|
|
|
/* mailbox fits in first part of CMDR space */
|
|
udev->cmdr_size = CMDR_SIZE - CMDR_OFF;
|
|
udev->data_off = CMDR_SIZE;
|
|
udev->data_size = udev->max_blocks * DATA_BLOCK_SIZE;
|
|
udev->dbi_thresh = 0; /* Default in Idle state */
|
|
|
|
/* Initialise the mailbox of the ring buffer */
|
|
mb = udev->mb_addr;
|
|
mb->version = TCMU_MAILBOX_VERSION;
|
|
mb->flags = TCMU_MAILBOX_FLAG_CAP_OOOC;
|
|
mb->cmdr_off = CMDR_OFF;
|
|
mb->cmdr_size = udev->cmdr_size;
|
|
|
|
WARN_ON(!PAGE_ALIGNED(udev->data_off));
|
|
WARN_ON(udev->data_size % PAGE_SIZE);
|
|
WARN_ON(udev->data_size % DATA_BLOCK_SIZE);
|
|
|
|
info->version = __stringify(TCMU_MAILBOX_VERSION);
|
|
|
|
info->mem[0].name = "tcm-user command & data buffer";
|
|
info->mem[0].addr = (phys_addr_t)(uintptr_t)udev->mb_addr;
|
|
info->mem[0].size = udev->ring_size = udev->data_size + CMDR_SIZE;
|
|
info->mem[0].memtype = UIO_MEM_NONE;
|
|
|
|
info->irqcontrol = tcmu_irqcontrol;
|
|
info->irq = UIO_IRQ_CUSTOM;
|
|
|
|
info->mmap = tcmu_mmap;
|
|
info->open = tcmu_open;
|
|
info->release = tcmu_release;
|
|
|
|
ret = uio_register_device(tcmu_root_device, info);
|
|
if (ret)
|
|
goto err_register;
|
|
|
|
/* User can set hw_block_size before enable the device */
|
|
if (dev->dev_attrib.hw_block_size == 0)
|
|
dev->dev_attrib.hw_block_size = 512;
|
|
/* Other attributes can be configured in userspace */
|
|
if (!dev->dev_attrib.hw_max_sectors)
|
|
dev->dev_attrib.hw_max_sectors = 128;
|
|
if (!dev->dev_attrib.emulate_write_cache)
|
|
dev->dev_attrib.emulate_write_cache = 0;
|
|
dev->dev_attrib.hw_queue_depth = 128;
|
|
|
|
/* If user didn't explicitly disable netlink reply support, use
|
|
* module scope setting.
|
|
*/
|
|
if (udev->nl_reply_supported >= 0)
|
|
udev->nl_reply_supported = tcmu_kern_cmd_reply_supported;
|
|
|
|
/*
|
|
* Get a ref incase userspace does a close on the uio device before
|
|
* LIO has initiated tcmu_free_device.
|
|
*/
|
|
kref_get(&udev->kref);
|
|
|
|
ret = tcmu_netlink_event(udev, TCMU_CMD_ADDED_DEVICE, 0, NULL);
|
|
if (ret)
|
|
goto err_netlink;
|
|
|
|
mutex_lock(&root_udev_mutex);
|
|
list_add(&udev->node, &root_udev);
|
|
mutex_unlock(&root_udev_mutex);
|
|
|
|
return 0;
|
|
|
|
err_netlink:
|
|
kref_put(&udev->kref, tcmu_dev_kref_release);
|
|
uio_unregister_device(&udev->uio_info);
|
|
err_register:
|
|
vfree(udev->mb_addr);
|
|
udev->mb_addr = NULL;
|
|
err_vzalloc:
|
|
kfree(udev->data_bitmap);
|
|
udev->data_bitmap = NULL;
|
|
err_bitmap_alloc:
|
|
kfree(info->name);
|
|
info->name = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool tcmu_dev_configured(struct tcmu_dev *udev)
|
|
{
|
|
return udev->uio_info.uio_dev ? true : false;
|
|
}
|
|
|
|
static void tcmu_free_device(struct se_device *dev)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
|
|
/* release ref from init */
|
|
kref_put(&udev->kref, tcmu_dev_kref_release);
|
|
}
|
|
|
|
static void tcmu_destroy_device(struct se_device *dev)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
|
|
del_timer_sync(&udev->cmd_timer);
|
|
del_timer_sync(&udev->qfull_timer);
|
|
|
|
mutex_lock(&root_udev_mutex);
|
|
list_del(&udev->node);
|
|
mutex_unlock(&root_udev_mutex);
|
|
|
|
tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL);
|
|
|
|
uio_unregister_device(&udev->uio_info);
|
|
|
|
/* release ref from configure */
|
|
kref_put(&udev->kref, tcmu_dev_kref_release);
|
|
}
|
|
|
|
static void tcmu_unblock_dev(struct tcmu_dev *udev)
|
|
{
|
|
mutex_lock(&udev->cmdr_lock);
|
|
clear_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
}
|
|
|
|
static void tcmu_block_dev(struct tcmu_dev *udev)
|
|
{
|
|
mutex_lock(&udev->cmdr_lock);
|
|
|
|
if (test_and_set_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags))
|
|
goto unlock;
|
|
|
|
/* complete IO that has executed successfully */
|
|
tcmu_handle_completions(udev);
|
|
/* fail IO waiting to be queued */
|
|
run_cmdr_queue(udev, true);
|
|
|
|
unlock:
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
}
|
|
|
|
static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level)
|
|
{
|
|
struct tcmu_mailbox *mb;
|
|
struct tcmu_cmd *cmd;
|
|
int i;
|
|
|
|
mutex_lock(&udev->cmdr_lock);
|
|
|
|
idr_for_each_entry(&udev->commands, cmd, i) {
|
|
if (!list_empty(&cmd->cmdr_queue_entry))
|
|
continue;
|
|
|
|
pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n",
|
|
cmd->cmd_id, udev->name,
|
|
test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags));
|
|
|
|
idr_remove(&udev->commands, i);
|
|
if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
|
|
if (err_level == 1) {
|
|
/*
|
|
* Userspace was not able to start the
|
|
* command or it is retryable.
|
|
*/
|
|
target_complete_cmd(cmd->se_cmd, SAM_STAT_BUSY);
|
|
} else {
|
|
/* hard failure */
|
|
target_complete_cmd(cmd->se_cmd,
|
|
SAM_STAT_CHECK_CONDITION);
|
|
}
|
|
}
|
|
tcmu_cmd_free_data(cmd, cmd->dbi_cnt);
|
|
tcmu_free_cmd(cmd);
|
|
}
|
|
|
|
mb = udev->mb_addr;
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
pr_debug("mb last %u head %u tail %u\n", udev->cmdr_last_cleaned,
|
|
mb->cmd_tail, mb->cmd_head);
|
|
|
|
udev->cmdr_last_cleaned = 0;
|
|
mb->cmd_tail = 0;
|
|
mb->cmd_head = 0;
|
|
tcmu_flush_dcache_range(mb, sizeof(*mb));
|
|
|
|
del_timer(&udev->cmd_timer);
|
|
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
}
|
|
|
|
enum {
|
|
Opt_dev_config, Opt_dev_size, Opt_hw_block_size, Opt_hw_max_sectors,
|
|
Opt_nl_reply_supported, Opt_max_data_area_mb, Opt_err,
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_dev_config, "dev_config=%s"},
|
|
{Opt_dev_size, "dev_size=%u"},
|
|
{Opt_hw_block_size, "hw_block_size=%u"},
|
|
{Opt_hw_max_sectors, "hw_max_sectors=%u"},
|
|
{Opt_nl_reply_supported, "nl_reply_supported=%d"},
|
|
{Opt_max_data_area_mb, "max_data_area_mb=%u"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static int tcmu_set_dev_attrib(substring_t *arg, u32 *dev_attrib)
|
|
{
|
|
unsigned long tmp_ul;
|
|
char *arg_p;
|
|
int ret;
|
|
|
|
arg_p = match_strdup(arg);
|
|
if (!arg_p)
|
|
return -ENOMEM;
|
|
|
|
ret = kstrtoul(arg_p, 0, &tmp_ul);
|
|
kfree(arg_p);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed for dev attrib\n");
|
|
return ret;
|
|
}
|
|
if (!tmp_ul) {
|
|
pr_err("dev attrib must be nonzero\n");
|
|
return -EINVAL;
|
|
}
|
|
*dev_attrib = tmp_ul;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t tcmu_set_configfs_dev_params(struct se_device *dev,
|
|
const char *page, ssize_t count)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
char *orig, *ptr, *opts, *arg_p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int ret = 0, token, tmpval;
|
|
|
|
opts = kstrdup(page, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
|
|
orig = opts;
|
|
|
|
while ((ptr = strsep(&opts, ",\n")) != NULL) {
|
|
if (!*ptr)
|
|
continue;
|
|
|
|
token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_dev_config:
|
|
if (match_strlcpy(udev->dev_config, &args[0],
|
|
TCMU_CONFIG_LEN) == 0) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
pr_debug("TCMU: Referencing Path: %s\n", udev->dev_config);
|
|
break;
|
|
case Opt_dev_size:
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = kstrtoul(arg_p, 0, (unsigned long *) &udev->dev_size);
|
|
kfree(arg_p);
|
|
if (ret < 0)
|
|
pr_err("kstrtoul() failed for dev_size=\n");
|
|
break;
|
|
case Opt_hw_block_size:
|
|
ret = tcmu_set_dev_attrib(&args[0],
|
|
&(dev->dev_attrib.hw_block_size));
|
|
break;
|
|
case Opt_hw_max_sectors:
|
|
ret = tcmu_set_dev_attrib(&args[0],
|
|
&(dev->dev_attrib.hw_max_sectors));
|
|
break;
|
|
case Opt_nl_reply_supported:
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = kstrtoint(arg_p, 0, &udev->nl_reply_supported);
|
|
kfree(arg_p);
|
|
if (ret < 0)
|
|
pr_err("kstrtoint() failed for nl_reply_supported=\n");
|
|
break;
|
|
case Opt_max_data_area_mb:
|
|
if (dev->export_count) {
|
|
pr_err("Unable to set max_data_area_mb while exports exist\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
arg_p = match_strdup(&args[0]);
|
|
if (!arg_p) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = kstrtoint(arg_p, 0, &tmpval);
|
|
kfree(arg_p);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoint() failed for max_data_area_mb=\n");
|
|
break;
|
|
}
|
|
|
|
if (tmpval <= 0) {
|
|
pr_err("Invalid max_data_area %d\n", tmpval);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
udev->max_blocks = TCMU_MBS_TO_BLOCKS(tmpval);
|
|
if (udev->max_blocks > tcmu_global_max_blocks) {
|
|
pr_err("%d is too large. Adjusting max_data_area_mb to global limit of %u\n",
|
|
tmpval,
|
|
TCMU_BLOCKS_TO_MBS(tcmu_global_max_blocks));
|
|
udev->max_blocks = tcmu_global_max_blocks;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t tcmu_show_configfs_dev_params(struct se_device *dev, char *b)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
ssize_t bl = 0;
|
|
|
|
bl = sprintf(b + bl, "Config: %s ",
|
|
udev->dev_config[0] ? udev->dev_config : "NULL");
|
|
bl += sprintf(b + bl, "Size: %zu ", udev->dev_size);
|
|
bl += sprintf(b + bl, "MaxDataAreaMB: %u\n",
|
|
TCMU_BLOCKS_TO_MBS(udev->max_blocks));
|
|
|
|
return bl;
|
|
}
|
|
|
|
static sector_t tcmu_get_blocks(struct se_device *dev)
|
|
{
|
|
struct tcmu_dev *udev = TCMU_DEV(dev);
|
|
|
|
return div_u64(udev->dev_size - dev->dev_attrib.block_size,
|
|
dev->dev_attrib.block_size);
|
|
}
|
|
|
|
static sense_reason_t
|
|
tcmu_parse_cdb(struct se_cmd *cmd)
|
|
{
|
|
return passthrough_parse_cdb(cmd, tcmu_queue_cmd);
|
|
}
|
|
|
|
static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC);
|
|
}
|
|
|
|
static ssize_t tcmu_cmd_time_out_store(struct config_item *item, const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = container_of(da->da_dev,
|
|
struct tcmu_dev, se_dev);
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (da->da_dev->export_count) {
|
|
pr_err("Unable to set tcmu cmd_time_out while exports exist\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = kstrtou32(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
udev->cmd_time_out = val * MSEC_PER_SEC;
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, cmd_time_out);
|
|
|
|
static ssize_t tcmu_qfull_time_out_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%ld\n", udev->qfull_time_out <= 0 ?
|
|
udev->qfull_time_out :
|
|
udev->qfull_time_out / MSEC_PER_SEC);
|
|
}
|
|
|
|
static ssize_t tcmu_qfull_time_out_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
s32 val;
|
|
int ret;
|
|
|
|
ret = kstrtos32(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val >= 0) {
|
|
udev->qfull_time_out = val * MSEC_PER_SEC;
|
|
} else if (val == -1) {
|
|
udev->qfull_time_out = val;
|
|
} else {
|
|
printk(KERN_ERR "Invalid qfull timeout value %d\n", val);
|
|
return -EINVAL;
|
|
}
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, qfull_time_out);
|
|
|
|
static ssize_t tcmu_max_data_area_mb_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%u\n",
|
|
TCMU_BLOCKS_TO_MBS(udev->max_blocks));
|
|
}
|
|
CONFIGFS_ATTR_RO(tcmu_, max_data_area_mb);
|
|
|
|
static ssize_t tcmu_dev_config_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%s\n", udev->dev_config);
|
|
}
|
|
|
|
static ssize_t tcmu_dev_config_store(struct config_item *item, const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
int ret, len;
|
|
|
|
len = strlen(page);
|
|
if (!len || len > TCMU_CONFIG_LEN - 1)
|
|
return -EINVAL;
|
|
|
|
/* Check if device has been configured before */
|
|
if (tcmu_dev_configured(udev)) {
|
|
ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE,
|
|
TCMU_ATTR_DEV_CFG, page);
|
|
if (ret) {
|
|
pr_err("Unable to reconfigure device\n");
|
|
return ret;
|
|
}
|
|
strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN);
|
|
|
|
ret = tcmu_update_uio_info(udev);
|
|
if (ret)
|
|
return ret;
|
|
return count;
|
|
}
|
|
strlcpy(udev->dev_config, page, TCMU_CONFIG_LEN);
|
|
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, dev_config);
|
|
|
|
static ssize_t tcmu_dev_size_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%zu\n", udev->dev_size);
|
|
}
|
|
|
|
static ssize_t tcmu_dev_size_store(struct config_item *item, const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
u64 val;
|
|
int ret;
|
|
|
|
ret = kstrtou64(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Check if device has been configured before */
|
|
if (tcmu_dev_configured(udev)) {
|
|
ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE,
|
|
TCMU_ATTR_DEV_SIZE, &val);
|
|
if (ret) {
|
|
pr_err("Unable to reconfigure device\n");
|
|
return ret;
|
|
}
|
|
}
|
|
udev->dev_size = val;
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, dev_size);
|
|
|
|
static ssize_t tcmu_nl_reply_supported_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%d\n", udev->nl_reply_supported);
|
|
}
|
|
|
|
static ssize_t tcmu_nl_reply_supported_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
s8 val;
|
|
int ret;
|
|
|
|
ret = kstrtos8(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
udev->nl_reply_supported = val;
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, nl_reply_supported);
|
|
|
|
static ssize_t tcmu_emulate_write_cache_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
|
|
return snprintf(page, PAGE_SIZE, "%i\n", da->emulate_write_cache);
|
|
}
|
|
|
|
static ssize_t tcmu_emulate_write_cache_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_dev_attrib *da = container_of(to_config_group(item),
|
|
struct se_dev_attrib, da_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
|
|
u8 val;
|
|
int ret;
|
|
|
|
ret = kstrtou8(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Check if device has been configured before */
|
|
if (tcmu_dev_configured(udev)) {
|
|
ret = tcmu_netlink_event(udev, TCMU_CMD_RECONFIG_DEVICE,
|
|
TCMU_ATTR_WRITECACHE, &val);
|
|
if (ret) {
|
|
pr_err("Unable to reconfigure device\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
da->emulate_write_cache = val;
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, emulate_write_cache);
|
|
|
|
static ssize_t tcmu_block_dev_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_device *se_dev = container_of(to_config_group(item),
|
|
struct se_device,
|
|
dev_action_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(se_dev);
|
|
|
|
if (test_bit(TCMU_DEV_BIT_BLOCKED, &udev->flags))
|
|
return snprintf(page, PAGE_SIZE, "%s\n", "blocked");
|
|
else
|
|
return snprintf(page, PAGE_SIZE, "%s\n", "unblocked");
|
|
}
|
|
|
|
static ssize_t tcmu_block_dev_store(struct config_item *item, const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_device *se_dev = container_of(to_config_group(item),
|
|
struct se_device,
|
|
dev_action_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(se_dev);
|
|
u8 val;
|
|
int ret;
|
|
|
|
ret = kstrtou8(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val > 1) {
|
|
pr_err("Invalid block value %d\n", val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!val)
|
|
tcmu_unblock_dev(udev);
|
|
else
|
|
tcmu_block_dev(udev);
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR(tcmu_, block_dev);
|
|
|
|
static ssize_t tcmu_reset_ring_store(struct config_item *item, const char *page,
|
|
size_t count)
|
|
{
|
|
struct se_device *se_dev = container_of(to_config_group(item),
|
|
struct se_device,
|
|
dev_action_group);
|
|
struct tcmu_dev *udev = TCMU_DEV(se_dev);
|
|
u8 val;
|
|
int ret;
|
|
|
|
ret = kstrtou8(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (val != 1 && val != 2) {
|
|
pr_err("Invalid reset ring value %d\n", val);
|
|
return -EINVAL;
|
|
}
|
|
|
|
tcmu_reset_ring(udev, val);
|
|
return count;
|
|
}
|
|
CONFIGFS_ATTR_WO(tcmu_, reset_ring);
|
|
|
|
static struct configfs_attribute *tcmu_attrib_attrs[] = {
|
|
&tcmu_attr_cmd_time_out,
|
|
&tcmu_attr_qfull_time_out,
|
|
&tcmu_attr_max_data_area_mb,
|
|
&tcmu_attr_dev_config,
|
|
&tcmu_attr_dev_size,
|
|
&tcmu_attr_emulate_write_cache,
|
|
&tcmu_attr_nl_reply_supported,
|
|
NULL,
|
|
};
|
|
|
|
static struct configfs_attribute **tcmu_attrs;
|
|
|
|
static struct configfs_attribute *tcmu_action_attrs[] = {
|
|
&tcmu_attr_block_dev,
|
|
&tcmu_attr_reset_ring,
|
|
NULL,
|
|
};
|
|
|
|
static struct target_backend_ops tcmu_ops = {
|
|
.name = "user",
|
|
.owner = THIS_MODULE,
|
|
.transport_flags = TRANSPORT_FLAG_PASSTHROUGH,
|
|
.attach_hba = tcmu_attach_hba,
|
|
.detach_hba = tcmu_detach_hba,
|
|
.alloc_device = tcmu_alloc_device,
|
|
.configure_device = tcmu_configure_device,
|
|
.destroy_device = tcmu_destroy_device,
|
|
.free_device = tcmu_free_device,
|
|
.parse_cdb = tcmu_parse_cdb,
|
|
.set_configfs_dev_params = tcmu_set_configfs_dev_params,
|
|
.show_configfs_dev_params = tcmu_show_configfs_dev_params,
|
|
.get_device_type = sbc_get_device_type,
|
|
.get_blocks = tcmu_get_blocks,
|
|
.tb_dev_action_attrs = tcmu_action_attrs,
|
|
};
|
|
|
|
static void find_free_blocks(void)
|
|
{
|
|
struct tcmu_dev *udev;
|
|
loff_t off;
|
|
u32 start, end, block, total_freed = 0;
|
|
|
|
if (atomic_read(&global_db_count) <= tcmu_global_max_blocks)
|
|
return;
|
|
|
|
mutex_lock(&root_udev_mutex);
|
|
list_for_each_entry(udev, &root_udev, node) {
|
|
mutex_lock(&udev->cmdr_lock);
|
|
|
|
/* Try to complete the finished commands first */
|
|
tcmu_handle_completions(udev);
|
|
|
|
/* Skip the udevs in idle */
|
|
if (!udev->dbi_thresh) {
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
continue;
|
|
}
|
|
|
|
end = udev->dbi_max + 1;
|
|
block = find_last_bit(udev->data_bitmap, end);
|
|
if (block == udev->dbi_max) {
|
|
/*
|
|
* The last bit is dbi_max, so it is not possible
|
|
* reclaim any blocks.
|
|
*/
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
continue;
|
|
} else if (block == end) {
|
|
/* The current udev will goto idle state */
|
|
udev->dbi_thresh = start = 0;
|
|
udev->dbi_max = 0;
|
|
} else {
|
|
udev->dbi_thresh = start = block + 1;
|
|
udev->dbi_max = block;
|
|
}
|
|
|
|
/* Here will truncate the data area from off */
|
|
off = udev->data_off + start * DATA_BLOCK_SIZE;
|
|
unmap_mapping_range(udev->inode->i_mapping, off, 0, 1);
|
|
|
|
/* Release the block pages */
|
|
tcmu_blocks_release(&udev->data_blocks, start, end);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
total_freed += end - start;
|
|
pr_debug("Freed %u blocks (total %u) from %s.\n", end - start,
|
|
total_freed, udev->name);
|
|
}
|
|
mutex_unlock(&root_udev_mutex);
|
|
|
|
if (atomic_read(&global_db_count) > tcmu_global_max_blocks)
|
|
schedule_delayed_work(&tcmu_unmap_work, msecs_to_jiffies(5000));
|
|
}
|
|
|
|
static void check_timedout_devices(void)
|
|
{
|
|
struct tcmu_dev *udev, *tmp_dev;
|
|
LIST_HEAD(devs);
|
|
|
|
spin_lock_bh(&timed_out_udevs_lock);
|
|
list_splice_init(&timed_out_udevs, &devs);
|
|
|
|
list_for_each_entry_safe(udev, tmp_dev, &devs, timedout_entry) {
|
|
list_del_init(&udev->timedout_entry);
|
|
spin_unlock_bh(&timed_out_udevs_lock);
|
|
|
|
mutex_lock(&udev->cmdr_lock);
|
|
idr_for_each(&udev->commands, tcmu_check_expired_cmd, NULL);
|
|
mutex_unlock(&udev->cmdr_lock);
|
|
|
|
spin_lock_bh(&timed_out_udevs_lock);
|
|
}
|
|
|
|
spin_unlock_bh(&timed_out_udevs_lock);
|
|
}
|
|
|
|
static void tcmu_unmap_work_fn(struct work_struct *work)
|
|
{
|
|
check_timedout_devices();
|
|
find_free_blocks();
|
|
}
|
|
|
|
static int __init tcmu_module_init(void)
|
|
{
|
|
int ret, i, k, len = 0;
|
|
|
|
BUILD_BUG_ON((sizeof(struct tcmu_cmd_entry) % TCMU_OP_ALIGN_SIZE) != 0);
|
|
|
|
INIT_DELAYED_WORK(&tcmu_unmap_work, tcmu_unmap_work_fn);
|
|
|
|
tcmu_cmd_cache = kmem_cache_create("tcmu_cmd_cache",
|
|
sizeof(struct tcmu_cmd),
|
|
__alignof__(struct tcmu_cmd),
|
|
0, NULL);
|
|
if (!tcmu_cmd_cache)
|
|
return -ENOMEM;
|
|
|
|
tcmu_root_device = root_device_register("tcm_user");
|
|
if (IS_ERR(tcmu_root_device)) {
|
|
ret = PTR_ERR(tcmu_root_device);
|
|
goto out_free_cache;
|
|
}
|
|
|
|
ret = genl_register_family(&tcmu_genl_family);
|
|
if (ret < 0) {
|
|
goto out_unreg_device;
|
|
}
|
|
|
|
for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) {
|
|
len += sizeof(struct configfs_attribute *);
|
|
}
|
|
for (i = 0; tcmu_attrib_attrs[i] != NULL; i++) {
|
|
len += sizeof(struct configfs_attribute *);
|
|
}
|
|
len += sizeof(struct configfs_attribute *);
|
|
|
|
tcmu_attrs = kzalloc(len, GFP_KERNEL);
|
|
if (!tcmu_attrs) {
|
|
ret = -ENOMEM;
|
|
goto out_unreg_genl;
|
|
}
|
|
|
|
for (i = 0; passthrough_attrib_attrs[i] != NULL; i++) {
|
|
tcmu_attrs[i] = passthrough_attrib_attrs[i];
|
|
}
|
|
for (k = 0; tcmu_attrib_attrs[k] != NULL; k++) {
|
|
tcmu_attrs[i] = tcmu_attrib_attrs[k];
|
|
i++;
|
|
}
|
|
tcmu_ops.tb_dev_attrib_attrs = tcmu_attrs;
|
|
|
|
ret = transport_backend_register(&tcmu_ops);
|
|
if (ret)
|
|
goto out_attrs;
|
|
|
|
return 0;
|
|
|
|
out_attrs:
|
|
kfree(tcmu_attrs);
|
|
out_unreg_genl:
|
|
genl_unregister_family(&tcmu_genl_family);
|
|
out_unreg_device:
|
|
root_device_unregister(tcmu_root_device);
|
|
out_free_cache:
|
|
kmem_cache_destroy(tcmu_cmd_cache);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit tcmu_module_exit(void)
|
|
{
|
|
cancel_delayed_work_sync(&tcmu_unmap_work);
|
|
target_backend_unregister(&tcmu_ops);
|
|
kfree(tcmu_attrs);
|
|
genl_unregister_family(&tcmu_genl_family);
|
|
root_device_unregister(tcmu_root_device);
|
|
kmem_cache_destroy(tcmu_cmd_cache);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("TCM USER subsystem plugin");
|
|
MODULE_AUTHOR("Shaohua Li <shli@kernel.org>");
|
|
MODULE_AUTHOR("Andy Grover <agrover@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(tcmu_module_init);
|
|
module_exit(tcmu_module_exit);
|