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![Dan Carpenter](/assets/img/avatar_default.png)
This patch converts rd_build_device_space() to return errno usage for failures in rd_create_virtdevice(). Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
1091 lines
27 KiB
C
1091 lines
27 KiB
C
/*******************************************************************************
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* Filename: target_core_rd.c
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*
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* This file contains the Storage Engine <-> Ramdisk transport
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* specific functions.
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*
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* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
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* Copyright (c) 2005, 2006, 2007 SBE, Inc.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/version.h>
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/timer.h>
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#include <linux/blkdev.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <target/target_core_base.h>
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#include <target/target_core_device.h>
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#include <target/target_core_transport.h>
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#include <target/target_core_fabric_ops.h>
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#include "target_core_rd.h"
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static struct se_subsystem_api rd_dr_template;
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static struct se_subsystem_api rd_mcp_template;
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/* #define DEBUG_RAMDISK_MCP */
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/* #define DEBUG_RAMDISK_DR */
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/* rd_attach_hba(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static int rd_attach_hba(struct se_hba *hba, u32 host_id)
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{
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struct rd_host *rd_host;
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rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
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if (!(rd_host)) {
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printk(KERN_ERR "Unable to allocate memory for struct rd_host\n");
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return -ENOMEM;
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}
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rd_host->rd_host_id = host_id;
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atomic_set(&hba->left_queue_depth, RD_HBA_QUEUE_DEPTH);
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atomic_set(&hba->max_queue_depth, RD_HBA_QUEUE_DEPTH);
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hba->hba_ptr = (void *) rd_host;
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printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
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" Generic Target Core Stack %s\n", hba->hba_id,
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RD_HBA_VERSION, TARGET_CORE_MOD_VERSION);
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printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic"
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" Target Core TCQ Depth: %d MaxSectors: %u\n", hba->hba_id,
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rd_host->rd_host_id, atomic_read(&hba->max_queue_depth),
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RD_MAX_SECTORS);
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return 0;
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}
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static void rd_detach_hba(struct se_hba *hba)
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{
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struct rd_host *rd_host = hba->hba_ptr;
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printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
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" Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
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kfree(rd_host);
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hba->hba_ptr = NULL;
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}
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/* rd_release_device_space():
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*
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*
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*/
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static void rd_release_device_space(struct rd_dev *rd_dev)
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{
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u32 i, j, page_count = 0, sg_per_table;
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struct rd_dev_sg_table *sg_table;
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struct page *pg;
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struct scatterlist *sg;
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if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
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return;
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sg_table = rd_dev->sg_table_array;
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for (i = 0; i < rd_dev->sg_table_count; i++) {
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sg = sg_table[i].sg_table;
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sg_per_table = sg_table[i].rd_sg_count;
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for (j = 0; j < sg_per_table; j++) {
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pg = sg_page(&sg[j]);
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if ((pg)) {
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__free_page(pg);
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page_count++;
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}
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}
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kfree(sg);
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}
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printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk"
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" Device ID: %u, pages %u in %u tables total bytes %lu\n",
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rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
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rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
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kfree(sg_table);
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rd_dev->sg_table_array = NULL;
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rd_dev->sg_table_count = 0;
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}
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/* rd_build_device_space():
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*
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*
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*/
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static int rd_build_device_space(struct rd_dev *rd_dev)
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{
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u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed;
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u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
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sizeof(struct scatterlist));
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struct rd_dev_sg_table *sg_table;
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struct page *pg;
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struct scatterlist *sg;
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if (rd_dev->rd_page_count <= 0) {
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printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n",
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rd_dev->rd_page_count);
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return -EINVAL;
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}
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total_sg_needed = rd_dev->rd_page_count;
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sg_tables = (total_sg_needed / max_sg_per_table) + 1;
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sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
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if (!(sg_table)) {
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printk(KERN_ERR "Unable to allocate memory for Ramdisk"
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" scatterlist tables\n");
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return -ENOMEM;
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}
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rd_dev->sg_table_array = sg_table;
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rd_dev->sg_table_count = sg_tables;
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while (total_sg_needed) {
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sg_per_table = (total_sg_needed > max_sg_per_table) ?
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max_sg_per_table : total_sg_needed;
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sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
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GFP_KERNEL);
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if (!(sg)) {
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printk(KERN_ERR "Unable to allocate scatterlist array"
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" for struct rd_dev\n");
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return -ENOMEM;
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}
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sg_init_table((struct scatterlist *)&sg[0], sg_per_table);
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sg_table[i].sg_table = sg;
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sg_table[i].rd_sg_count = sg_per_table;
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sg_table[i].page_start_offset = page_offset;
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sg_table[i++].page_end_offset = (page_offset + sg_per_table)
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- 1;
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for (j = 0; j < sg_per_table; j++) {
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pg = alloc_pages(GFP_KERNEL, 0);
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if (!(pg)) {
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printk(KERN_ERR "Unable to allocate scatterlist"
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" pages for struct rd_dev_sg_table\n");
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return -ENOMEM;
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}
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sg_assign_page(&sg[j], pg);
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sg[j].length = PAGE_SIZE;
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}
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page_offset += sg_per_table;
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total_sg_needed -= sg_per_table;
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}
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printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
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" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
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rd_dev->rd_dev_id, rd_dev->rd_page_count,
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rd_dev->sg_table_count);
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return 0;
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}
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static void *rd_allocate_virtdevice(
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struct se_hba *hba,
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const char *name,
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int rd_direct)
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{
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struct rd_dev *rd_dev;
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struct rd_host *rd_host = hba->hba_ptr;
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rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
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if (!(rd_dev)) {
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printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n");
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return NULL;
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}
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rd_dev->rd_host = rd_host;
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rd_dev->rd_direct = rd_direct;
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return rd_dev;
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}
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static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name)
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{
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return rd_allocate_virtdevice(hba, name, 1);
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}
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static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name)
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{
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return rd_allocate_virtdevice(hba, name, 0);
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}
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/* rd_create_virtdevice():
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*
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*
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*/
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static struct se_device *rd_create_virtdevice(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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void *p,
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int rd_direct)
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{
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struct se_device *dev;
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struct se_dev_limits dev_limits;
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struct rd_dev *rd_dev = p;
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struct rd_host *rd_host = hba->hba_ptr;
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int dev_flags = 0, ret;
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char prod[16], rev[4];
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memset(&dev_limits, 0, sizeof(struct se_dev_limits));
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ret = rd_build_device_space(rd_dev);
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if (ret < 0)
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goto fail;
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snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP");
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snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION :
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RD_MCP_VERSION);
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dev_limits.limits.logical_block_size = RD_BLOCKSIZE;
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dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS;
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dev_limits.limits.max_sectors = RD_MAX_SECTORS;
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dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
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dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH;
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dev = transport_add_device_to_core_hba(hba,
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(rd_dev->rd_direct) ? &rd_dr_template :
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&rd_mcp_template, se_dev, dev_flags, (void *)rd_dev,
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&dev_limits, prod, rev);
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if (!(dev))
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goto fail;
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rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
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rd_dev->rd_queue_depth = dev->queue_depth;
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printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of"
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" %u pages in %u tables, %lu total bytes\n",
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rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" :
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"DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count,
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rd_dev->sg_table_count,
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(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
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return dev;
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fail:
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rd_release_device_space(rd_dev);
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return ERR_PTR(ret);
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}
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static struct se_device *rd_DIRECT_create_virtdevice(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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void *p)
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{
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return rd_create_virtdevice(hba, se_dev, p, 1);
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}
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static struct se_device *rd_MEMCPY_create_virtdevice(
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struct se_hba *hba,
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struct se_subsystem_dev *se_dev,
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void *p)
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{
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return rd_create_virtdevice(hba, se_dev, p, 0);
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}
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/* rd_free_device(): (Part of se_subsystem_api_t template)
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*
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*
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*/
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static void rd_free_device(void *p)
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{
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struct rd_dev *rd_dev = p;
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rd_release_device_space(rd_dev);
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kfree(rd_dev);
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}
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static inline struct rd_request *RD_REQ(struct se_task *task)
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{
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return container_of(task, struct rd_request, rd_task);
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}
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static struct se_task *
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rd_alloc_task(struct se_cmd *cmd)
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{
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struct rd_request *rd_req;
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rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL);
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if (!rd_req) {
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printk(KERN_ERR "Unable to allocate struct rd_request\n");
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return NULL;
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}
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rd_req->rd_dev = SE_DEV(cmd)->dev_ptr;
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return &rd_req->rd_task;
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}
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/* rd_get_sg_table():
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*
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*
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*/
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static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
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{
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u32 i;
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struct rd_dev_sg_table *sg_table;
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for (i = 0; i < rd_dev->sg_table_count; i++) {
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sg_table = &rd_dev->sg_table_array[i];
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if ((sg_table->page_start_offset <= page) &&
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(sg_table->page_end_offset >= page))
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return sg_table;
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}
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printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n",
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page);
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return NULL;
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}
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/* rd_MEMCPY_read():
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*
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*
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*/
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static int rd_MEMCPY_read(struct rd_request *req)
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{
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struct se_task *task = &req->rd_task;
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struct rd_dev *dev = req->rd_dev;
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struct rd_dev_sg_table *table;
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struct scatterlist *sg_d, *sg_s;
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void *dst, *src;
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u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
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u32 length, page_end = 0, table_sg_end;
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u32 rd_offset = req->rd_offset;
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table = rd_get_sg_table(dev, req->rd_page);
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if (!(table))
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return -1;
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table_sg_end = (table->page_end_offset - req->rd_page);
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sg_d = task->task_sg;
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sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:"
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" %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
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req->rd_page, req->rd_offset);
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#endif
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src_offset = rd_offset;
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while (req->rd_size) {
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if ((sg_d[i].length - dst_offset) <
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(sg_s[j].length - src_offset)) {
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length = (sg_d[i].length - dst_offset);
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d"
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" offset: %u sg_s[%d].length: %u\n", i,
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&sg_d[i], sg_d[i].length, sg_d[i].offset, j,
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sg_s[j].length);
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printk(KERN_INFO "Step 1 - length: %u dst_offset: %u"
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" src_offset: %u\n", length, dst_offset,
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src_offset);
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#endif
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if (length > req->rd_size)
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length = req->rd_size;
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dst = sg_virt(&sg_d[i++]) + dst_offset;
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if (!dst)
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BUG();
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src = sg_virt(&sg_s[j]) + src_offset;
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if (!src)
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BUG();
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dst_offset = 0;
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src_offset = length;
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page_end = 0;
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} else {
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length = (sg_s[j].length - src_offset);
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d"
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" offset: %u sg_s[%d].length: %u\n", i,
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&sg_d[i], sg_d[i].length, sg_d[i].offset,
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j, sg_s[j].length);
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printk(KERN_INFO "Step 2 - length: %u dst_offset: %u"
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" src_offset: %u\n", length, dst_offset,
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src_offset);
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#endif
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if (length > req->rd_size)
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length = req->rd_size;
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|
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dst = sg_virt(&sg_d[i]) + dst_offset;
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if (!dst)
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BUG();
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|
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if (sg_d[i].length == length) {
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i++;
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dst_offset = 0;
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} else
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dst_offset = length;
|
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|
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src = sg_virt(&sg_s[j++]) + src_offset;
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if (!src)
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BUG();
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src_offset = 0;
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page_end = 1;
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}
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memcpy(dst, src, length);
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|
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "page: %u, remaining size: %u, length: %u,"
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" i: %u, j: %u\n", req->rd_page,
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(req->rd_size - length), length, i, j);
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#endif
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req->rd_size -= length;
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if (!(req->rd_size))
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return 0;
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|
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if (!page_end)
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continue;
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|
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if (++req->rd_page <= table->page_end_offset) {
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "page: %u in same page table\n",
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req->rd_page);
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#endif
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continue;
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}
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#ifdef DEBUG_RAMDISK_MCP
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printk(KERN_INFO "getting new page table for page: %u\n",
|
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req->rd_page);
|
|
#endif
|
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table = rd_get_sg_table(dev, req->rd_page);
|
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if (!(table))
|
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return -1;
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|
|
sg_s = &table->sg_table[j = 0];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* rd_MEMCPY_write():
|
|
*
|
|
*
|
|
*/
|
|
static int rd_MEMCPY_write(struct rd_request *req)
|
|
{
|
|
struct se_task *task = &req->rd_task;
|
|
struct rd_dev *dev = req->rd_dev;
|
|
struct rd_dev_sg_table *table;
|
|
struct scatterlist *sg_d, *sg_s;
|
|
void *dst, *src;
|
|
u32 i = 0, j = 0, dst_offset = 0, src_offset = 0;
|
|
u32 length, page_end = 0, table_sg_end;
|
|
u32 rd_offset = req->rd_offset;
|
|
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
table_sg_end = (table->page_end_offset - req->rd_page);
|
|
sg_d = &table->sg_table[req->rd_page - table->page_start_offset];
|
|
sg_s = task->task_sg;
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u,"
|
|
" Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size,
|
|
req->rd_page, req->rd_offset);
|
|
#endif
|
|
dst_offset = rd_offset;
|
|
|
|
while (req->rd_size) {
|
|
if ((sg_s[i].length - src_offset) <
|
|
(sg_d[j].length - dst_offset)) {
|
|
length = (sg_s[i].length - src_offset);
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d"
|
|
" offset: %d sg_d[%d].length: %u\n", i,
|
|
&sg_s[i], sg_s[i].length, sg_s[i].offset,
|
|
j, sg_d[j].length);
|
|
printk(KERN_INFO "Step 1 - length: %u src_offset: %u"
|
|
" dst_offset: %u\n", length, src_offset,
|
|
dst_offset);
|
|
#endif
|
|
if (length > req->rd_size)
|
|
length = req->rd_size;
|
|
|
|
src = sg_virt(&sg_s[i++]) + src_offset;
|
|
if (!src)
|
|
BUG();
|
|
|
|
dst = sg_virt(&sg_d[j]) + dst_offset;
|
|
if (!dst)
|
|
BUG();
|
|
|
|
src_offset = 0;
|
|
dst_offset = length;
|
|
page_end = 0;
|
|
} else {
|
|
length = (sg_d[j].length - dst_offset);
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d"
|
|
" offset: %d sg_d[%d].length: %u\n", i,
|
|
&sg_s[i], sg_s[i].length, sg_s[i].offset,
|
|
j, sg_d[j].length);
|
|
printk(KERN_INFO "Step 2 - length: %u src_offset: %u"
|
|
" dst_offset: %u\n", length, src_offset,
|
|
dst_offset);
|
|
#endif
|
|
if (length > req->rd_size)
|
|
length = req->rd_size;
|
|
|
|
src = sg_virt(&sg_s[i]) + src_offset;
|
|
if (!src)
|
|
BUG();
|
|
|
|
if (sg_s[i].length == length) {
|
|
i++;
|
|
src_offset = 0;
|
|
} else
|
|
src_offset = length;
|
|
|
|
dst = sg_virt(&sg_d[j++]) + dst_offset;
|
|
if (!dst)
|
|
BUG();
|
|
|
|
dst_offset = 0;
|
|
page_end = 1;
|
|
}
|
|
|
|
memcpy(dst, src, length);
|
|
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "page: %u, remaining size: %u, length: %u,"
|
|
" i: %u, j: %u\n", req->rd_page,
|
|
(req->rd_size - length), length, i, j);
|
|
#endif
|
|
req->rd_size -= length;
|
|
if (!(req->rd_size))
|
|
return 0;
|
|
|
|
if (!page_end)
|
|
continue;
|
|
|
|
if (++req->rd_page <= table->page_end_offset) {
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "page: %u in same page table\n",
|
|
req->rd_page);
|
|
#endif
|
|
continue;
|
|
}
|
|
#ifdef DEBUG_RAMDISK_MCP
|
|
printk(KERN_INFO "getting new page table for page: %u\n",
|
|
req->rd_page);
|
|
#endif
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
sg_d = &table->sg_table[j = 0];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static int rd_MEMCPY_do_task(struct se_task *task)
|
|
{
|
|
struct se_device *dev = task->se_dev;
|
|
struct rd_request *req = RD_REQ(task);
|
|
unsigned long long lba;
|
|
int ret;
|
|
|
|
req->rd_page = (task->task_lba * DEV_ATTRIB(dev)->block_size) / PAGE_SIZE;
|
|
lba = task->task_lba;
|
|
req->rd_offset = (do_div(lba,
|
|
(PAGE_SIZE / DEV_ATTRIB(dev)->block_size))) *
|
|
DEV_ATTRIB(dev)->block_size;
|
|
req->rd_size = task->task_size;
|
|
|
|
if (task->task_data_direction == DMA_FROM_DEVICE)
|
|
ret = rd_MEMCPY_read(req);
|
|
else
|
|
ret = rd_MEMCPY_write(req);
|
|
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
task->task_scsi_status = GOOD;
|
|
transport_complete_task(task, 1);
|
|
|
|
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
|
|
}
|
|
|
|
/* rd_DIRECT_with_offset():
|
|
*
|
|
*
|
|
*/
|
|
static int rd_DIRECT_with_offset(
|
|
struct se_task *task,
|
|
struct list_head *se_mem_list,
|
|
u32 *se_mem_cnt,
|
|
u32 *task_offset)
|
|
{
|
|
struct rd_request *req = RD_REQ(task);
|
|
struct rd_dev *dev = req->rd_dev;
|
|
struct rd_dev_sg_table *table;
|
|
struct se_mem *se_mem;
|
|
struct scatterlist *sg_s;
|
|
u32 j = 0, set_offset = 1;
|
|
u32 get_next_table = 0, offset_length, table_sg_end;
|
|
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
table_sg_end = (table->page_end_offset - req->rd_page);
|
|
sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n",
|
|
(task->task_data_direction == DMA_TO_DEVICE) ?
|
|
"Write" : "Read",
|
|
task->task_lba, req->rd_size, req->rd_page, req->rd_offset);
|
|
#endif
|
|
while (req->rd_size) {
|
|
se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
|
|
if (!(se_mem)) {
|
|
printk(KERN_ERR "Unable to allocate struct se_mem\n");
|
|
return -1;
|
|
}
|
|
INIT_LIST_HEAD(&se_mem->se_list);
|
|
|
|
if (set_offset) {
|
|
offset_length = sg_s[j].length - req->rd_offset;
|
|
if (offset_length > req->rd_size)
|
|
offset_length = req->rd_size;
|
|
|
|
se_mem->se_page = sg_page(&sg_s[j++]);
|
|
se_mem->se_off = req->rd_offset;
|
|
se_mem->se_len = offset_length;
|
|
|
|
set_offset = 0;
|
|
get_next_table = (j > table_sg_end);
|
|
goto check_eot;
|
|
}
|
|
|
|
offset_length = (req->rd_size < req->rd_offset) ?
|
|
req->rd_size : req->rd_offset;
|
|
|
|
se_mem->se_page = sg_page(&sg_s[j]);
|
|
se_mem->se_len = offset_length;
|
|
|
|
set_offset = 1;
|
|
|
|
check_eot:
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u"
|
|
" se_mem: %p, se_page: %p se_off: %u se_len: %u\n",
|
|
req->rd_page, req->rd_size, offset_length, j, se_mem,
|
|
se_mem->se_page, se_mem->se_off, se_mem->se_len);
|
|
#endif
|
|
list_add_tail(&se_mem->se_list, se_mem_list);
|
|
(*se_mem_cnt)++;
|
|
|
|
req->rd_size -= offset_length;
|
|
if (!(req->rd_size))
|
|
goto out;
|
|
|
|
if (!set_offset && !get_next_table)
|
|
continue;
|
|
|
|
if (++req->rd_page <= table->page_end_offset) {
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "page: %u in same page table\n",
|
|
req->rd_page);
|
|
#endif
|
|
continue;
|
|
}
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "getting new page table for page: %u\n",
|
|
req->rd_page);
|
|
#endif
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
sg_s = &table->sg_table[j = 0];
|
|
}
|
|
|
|
out:
|
|
T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n",
|
|
*se_mem_cnt);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* rd_DIRECT_without_offset():
|
|
*
|
|
*
|
|
*/
|
|
static int rd_DIRECT_without_offset(
|
|
struct se_task *task,
|
|
struct list_head *se_mem_list,
|
|
u32 *se_mem_cnt,
|
|
u32 *task_offset)
|
|
{
|
|
struct rd_request *req = RD_REQ(task);
|
|
struct rd_dev *dev = req->rd_dev;
|
|
struct rd_dev_sg_table *table;
|
|
struct se_mem *se_mem;
|
|
struct scatterlist *sg_s;
|
|
u32 length, j = 0;
|
|
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
sg_s = &table->sg_table[req->rd_page - table->page_start_offset];
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n",
|
|
(task->task_data_direction == DMA_TO_DEVICE) ?
|
|
"Write" : "Read",
|
|
task->task_lba, req->rd_size, req->rd_page);
|
|
#endif
|
|
while (req->rd_size) {
|
|
se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL);
|
|
if (!(se_mem)) {
|
|
printk(KERN_ERR "Unable to allocate struct se_mem\n");
|
|
return -1;
|
|
}
|
|
INIT_LIST_HEAD(&se_mem->se_list);
|
|
|
|
length = (req->rd_size < sg_s[j].length) ?
|
|
req->rd_size : sg_s[j].length;
|
|
|
|
se_mem->se_page = sg_page(&sg_s[j++]);
|
|
se_mem->se_len = length;
|
|
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p,"
|
|
" se_page: %p se_off: %u se_len: %u\n", req->rd_page,
|
|
req->rd_size, j, se_mem, se_mem->se_page,
|
|
se_mem->se_off, se_mem->se_len);
|
|
#endif
|
|
list_add_tail(&se_mem->se_list, se_mem_list);
|
|
(*se_mem_cnt)++;
|
|
|
|
req->rd_size -= length;
|
|
if (!(req->rd_size))
|
|
goto out;
|
|
|
|
if (++req->rd_page <= table->page_end_offset) {
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk("page: %u in same page table\n",
|
|
req->rd_page);
|
|
#endif
|
|
continue;
|
|
}
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "getting new page table for page: %u\n",
|
|
req->rd_page);
|
|
#endif
|
|
table = rd_get_sg_table(dev, req->rd_page);
|
|
if (!(table))
|
|
return -1;
|
|
|
|
sg_s = &table->sg_table[j = 0];
|
|
}
|
|
|
|
out:
|
|
T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt;
|
|
#ifdef DEBUG_RAMDISK_DR
|
|
printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n",
|
|
*se_mem_cnt);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* rd_DIRECT_do_se_mem_map():
|
|
*
|
|
*
|
|
*/
|
|
static int rd_DIRECT_do_se_mem_map(
|
|
struct se_task *task,
|
|
struct list_head *se_mem_list,
|
|
void *in_mem,
|
|
struct se_mem *in_se_mem,
|
|
struct se_mem **out_se_mem,
|
|
u32 *se_mem_cnt,
|
|
u32 *task_offset_in)
|
|
{
|
|
struct se_cmd *cmd = task->task_se_cmd;
|
|
struct rd_request *req = RD_REQ(task);
|
|
u32 task_offset = *task_offset_in;
|
|
unsigned long long lba;
|
|
int ret;
|
|
|
|
req->rd_page = ((task->task_lba * DEV_ATTRIB(task->se_dev)->block_size) /
|
|
PAGE_SIZE);
|
|
lba = task->task_lba;
|
|
req->rd_offset = (do_div(lba,
|
|
(PAGE_SIZE / DEV_ATTRIB(task->se_dev)->block_size))) *
|
|
DEV_ATTRIB(task->se_dev)->block_size;
|
|
req->rd_size = task->task_size;
|
|
|
|
if (req->rd_offset)
|
|
ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt,
|
|
task_offset_in);
|
|
else
|
|
ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt,
|
|
task_offset_in);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (CMD_TFO(cmd)->task_sg_chaining == 0)
|
|
return 0;
|
|
/*
|
|
* Currently prevent writers from multiple HW fabrics doing
|
|
* pci_map_sg() to RD_DR's internal scatterlist memory.
|
|
*/
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
printk(KERN_ERR "DMA_TO_DEVICE not supported for"
|
|
" RAMDISK_DR with task_sg_chaining=1\n");
|
|
return -1;
|
|
}
|
|
/*
|
|
* Special case for if task_sg_chaining is enabled, then
|
|
* we setup struct se_task->task_sg[], as it will be used by
|
|
* transport_do_task_sg_chain() for creating chainged SGLs
|
|
* across multiple struct se_task->task_sg[].
|
|
*/
|
|
if (!(transport_calc_sg_num(task,
|
|
list_entry(T_TASK(cmd)->t_mem_list->next,
|
|
struct se_mem, se_list),
|
|
task_offset)))
|
|
return -1;
|
|
|
|
return transport_map_mem_to_sg(task, se_mem_list, task->task_sg,
|
|
list_entry(T_TASK(cmd)->t_mem_list->next,
|
|
struct se_mem, se_list),
|
|
out_se_mem, se_mem_cnt, task_offset_in);
|
|
}
|
|
|
|
/* rd_DIRECT_do_task(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static int rd_DIRECT_do_task(struct se_task *task)
|
|
{
|
|
/*
|
|
* At this point the locally allocated RD tables have been mapped
|
|
* to struct se_mem elements in rd_DIRECT_do_se_mem_map().
|
|
*/
|
|
task->task_scsi_status = GOOD;
|
|
transport_complete_task(task, 1);
|
|
|
|
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
|
|
}
|
|
|
|
/* rd_free_task(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static void rd_free_task(struct se_task *task)
|
|
{
|
|
kfree(RD_REQ(task));
|
|
}
|
|
|
|
enum {
|
|
Opt_rd_pages, Opt_err
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_rd_pages, "rd_pages=%d"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static ssize_t rd_set_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
const char *page,
|
|
ssize_t count)
|
|
{
|
|
struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
|
|
char *orig, *ptr, *opts;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int ret = 0, arg, token;
|
|
|
|
opts = kstrdup(page, GFP_KERNEL);
|
|
if (!opts)
|
|
return -ENOMEM;
|
|
|
|
orig = opts;
|
|
|
|
while ((ptr = strsep(&opts, ",")) != NULL) {
|
|
if (!*ptr)
|
|
continue;
|
|
|
|
token = match_token(ptr, tokens, args);
|
|
switch (token) {
|
|
case Opt_rd_pages:
|
|
match_int(args, &arg);
|
|
rd_dev->rd_page_count = arg;
|
|
printk(KERN_INFO "RAMDISK: Referencing Page"
|
|
" Count: %u\n", rd_dev->rd_page_count);
|
|
rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev)
|
|
{
|
|
struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
|
|
|
|
if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
|
|
printk(KERN_INFO "Missing rd_pages= parameter\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t rd_show_configfs_dev_params(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_dev *se_dev,
|
|
char *b)
|
|
{
|
|
struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
|
|
ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n",
|
|
rd_dev->rd_dev_id, (rd_dev->rd_direct) ?
|
|
"rd_direct" : "rd_mcp");
|
|
bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu"
|
|
" SG_table_count: %u\n", rd_dev->rd_page_count,
|
|
PAGE_SIZE, rd_dev->sg_table_count);
|
|
return bl;
|
|
}
|
|
|
|
/* rd_get_cdb(): (Part of se_subsystem_api_t template)
|
|
*
|
|
*
|
|
*/
|
|
static unsigned char *rd_get_cdb(struct se_task *task)
|
|
{
|
|
struct rd_request *req = RD_REQ(task);
|
|
|
|
return req->rd_scsi_cdb;
|
|
}
|
|
|
|
static u32 rd_get_device_rev(struct se_device *dev)
|
|
{
|
|
return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
|
|
}
|
|
|
|
static u32 rd_get_device_type(struct se_device *dev)
|
|
{
|
|
return TYPE_DISK;
|
|
}
|
|
|
|
static sector_t rd_get_blocks(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = dev->dev_ptr;
|
|
unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
|
|
DEV_ATTRIB(dev)->block_size) - 1;
|
|
|
|
return blocks_long;
|
|
}
|
|
|
|
static struct se_subsystem_api rd_dr_template = {
|
|
.name = "rd_dr",
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_VDEV,
|
|
.attach_hba = rd_attach_hba,
|
|
.detach_hba = rd_detach_hba,
|
|
.allocate_virtdevice = rd_DIRECT_allocate_virtdevice,
|
|
.create_virtdevice = rd_DIRECT_create_virtdevice,
|
|
.free_device = rd_free_device,
|
|
.alloc_task = rd_alloc_task,
|
|
.do_task = rd_DIRECT_do_task,
|
|
.free_task = rd_free_task,
|
|
.check_configfs_dev_params = rd_check_configfs_dev_params,
|
|
.set_configfs_dev_params = rd_set_configfs_dev_params,
|
|
.show_configfs_dev_params = rd_show_configfs_dev_params,
|
|
.get_cdb = rd_get_cdb,
|
|
.get_device_rev = rd_get_device_rev,
|
|
.get_device_type = rd_get_device_type,
|
|
.get_blocks = rd_get_blocks,
|
|
.do_se_mem_map = rd_DIRECT_do_se_mem_map,
|
|
};
|
|
|
|
static struct se_subsystem_api rd_mcp_template = {
|
|
.name = "rd_mcp",
|
|
.transport_type = TRANSPORT_PLUGIN_VHBA_VDEV,
|
|
.attach_hba = rd_attach_hba,
|
|
.detach_hba = rd_detach_hba,
|
|
.allocate_virtdevice = rd_MEMCPY_allocate_virtdevice,
|
|
.create_virtdevice = rd_MEMCPY_create_virtdevice,
|
|
.free_device = rd_free_device,
|
|
.alloc_task = rd_alloc_task,
|
|
.do_task = rd_MEMCPY_do_task,
|
|
.free_task = rd_free_task,
|
|
.check_configfs_dev_params = rd_check_configfs_dev_params,
|
|
.set_configfs_dev_params = rd_set_configfs_dev_params,
|
|
.show_configfs_dev_params = rd_show_configfs_dev_params,
|
|
.get_cdb = rd_get_cdb,
|
|
.get_device_rev = rd_get_device_rev,
|
|
.get_device_type = rd_get_device_type,
|
|
.get_blocks = rd_get_blocks,
|
|
};
|
|
|
|
int __init rd_module_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = transport_subsystem_register(&rd_dr_template);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = transport_subsystem_register(&rd_mcp_template);
|
|
if (ret < 0) {
|
|
transport_subsystem_release(&rd_dr_template);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rd_module_exit(void)
|
|
{
|
|
transport_subsystem_release(&rd_dr_template);
|
|
transport_subsystem_release(&rd_mcp_template);
|
|
}
|