mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 14:52:05 +00:00
8dcf07be2d
Remove superfluous #include directives from the include/target/*.h files. Add missing #include directives to other *.h and *.c files. Use forward declarations for structures where possible. This change reduces the build time for make M=drivers/target on my laptop from 27.1s to 18.7s or by about 30%. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
688 lines
17 KiB
C
688 lines
17 KiB
C
/*******************************************************************************
|
|
* Filename: target_core_rd.c
|
|
*
|
|
* This file contains the Storage Engine <-> Ramdisk transport
|
|
* specific functions.
|
|
*
|
|
* (c) Copyright 2003-2013 Datera, Inc.
|
|
*
|
|
* Nicholas A. Bellinger <nab@kernel.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <linux/string.h>
|
|
#include <linux/parser.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <scsi/scsi_proto.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_backend.h>
|
|
|
|
#include "target_core_rd.h"
|
|
|
|
static inline struct rd_dev *RD_DEV(struct se_device *dev)
|
|
{
|
|
return container_of(dev, struct rd_dev, dev);
|
|
}
|
|
|
|
static int rd_attach_hba(struct se_hba *hba, u32 host_id)
|
|
{
|
|
struct rd_host *rd_host;
|
|
|
|
rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
|
|
if (!rd_host) {
|
|
pr_err("Unable to allocate memory for struct rd_host\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rd_host->rd_host_id = host_id;
|
|
|
|
hba->hba_ptr = rd_host;
|
|
|
|
pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
|
|
" Generic Target Core Stack %s\n", hba->hba_id,
|
|
RD_HBA_VERSION, TARGET_CORE_VERSION);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rd_detach_hba(struct se_hba *hba)
|
|
{
|
|
struct rd_host *rd_host = hba->hba_ptr;
|
|
|
|
pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
|
|
" Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
|
|
|
|
kfree(rd_host);
|
|
hba->hba_ptr = NULL;
|
|
}
|
|
|
|
static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
|
|
u32 sg_table_count)
|
|
{
|
|
struct page *pg;
|
|
struct scatterlist *sg;
|
|
u32 i, j, page_count = 0, sg_per_table;
|
|
|
|
for (i = 0; i < sg_table_count; i++) {
|
|
sg = sg_table[i].sg_table;
|
|
sg_per_table = sg_table[i].rd_sg_count;
|
|
|
|
for (j = 0; j < sg_per_table; j++) {
|
|
pg = sg_page(&sg[j]);
|
|
if (pg) {
|
|
__free_page(pg);
|
|
page_count++;
|
|
}
|
|
}
|
|
kfree(sg);
|
|
}
|
|
|
|
kfree(sg_table);
|
|
return page_count;
|
|
}
|
|
|
|
static void rd_release_device_space(struct rd_dev *rd_dev)
|
|
{
|
|
u32 page_count;
|
|
|
|
if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
|
|
return;
|
|
|
|
page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
|
|
rd_dev->sg_table_count);
|
|
|
|
pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
|
|
" Device ID: %u, pages %u in %u tables total bytes %lu\n",
|
|
rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
|
|
rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
|
|
|
|
rd_dev->sg_table_array = NULL;
|
|
rd_dev->sg_table_count = 0;
|
|
}
|
|
|
|
|
|
/* rd_build_device_space():
|
|
*
|
|
*
|
|
*/
|
|
static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
|
|
u32 total_sg_needed, unsigned char init_payload)
|
|
{
|
|
u32 i = 0, j, page_offset = 0, sg_per_table;
|
|
u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
|
|
sizeof(struct scatterlist));
|
|
struct page *pg;
|
|
struct scatterlist *sg;
|
|
unsigned char *p;
|
|
|
|
while (total_sg_needed) {
|
|
unsigned int chain_entry = 0;
|
|
|
|
sg_per_table = (total_sg_needed > max_sg_per_table) ?
|
|
max_sg_per_table : total_sg_needed;
|
|
|
|
/*
|
|
* Reserve extra element for chain entry
|
|
*/
|
|
if (sg_per_table < total_sg_needed)
|
|
chain_entry = 1;
|
|
|
|
sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg),
|
|
GFP_KERNEL);
|
|
if (!sg) {
|
|
pr_err("Unable to allocate scatterlist array"
|
|
" for struct rd_dev\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sg_init_table(sg, sg_per_table + chain_entry);
|
|
|
|
if (i > 0) {
|
|
sg_chain(sg_table[i - 1].sg_table,
|
|
max_sg_per_table + 1, sg);
|
|
}
|
|
|
|
sg_table[i].sg_table = sg;
|
|
sg_table[i].rd_sg_count = sg_per_table;
|
|
sg_table[i].page_start_offset = page_offset;
|
|
sg_table[i++].page_end_offset = (page_offset + sg_per_table)
|
|
- 1;
|
|
|
|
for (j = 0; j < sg_per_table; j++) {
|
|
pg = alloc_pages(GFP_KERNEL, 0);
|
|
if (!pg) {
|
|
pr_err("Unable to allocate scatterlist"
|
|
" pages for struct rd_dev_sg_table\n");
|
|
return -ENOMEM;
|
|
}
|
|
sg_assign_page(&sg[j], pg);
|
|
sg[j].length = PAGE_SIZE;
|
|
|
|
p = kmap(pg);
|
|
memset(p, init_payload, PAGE_SIZE);
|
|
kunmap(pg);
|
|
}
|
|
|
|
page_offset += sg_per_table;
|
|
total_sg_needed -= sg_per_table;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rd_build_device_space(struct rd_dev *rd_dev)
|
|
{
|
|
struct rd_dev_sg_table *sg_table;
|
|
u32 sg_tables, total_sg_needed;
|
|
u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
|
|
sizeof(struct scatterlist));
|
|
int rc;
|
|
|
|
if (rd_dev->rd_page_count <= 0) {
|
|
pr_err("Illegal page count: %u for Ramdisk device\n",
|
|
rd_dev->rd_page_count);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Don't need backing pages for NULLIO */
|
|
if (rd_dev->rd_flags & RDF_NULLIO)
|
|
return 0;
|
|
|
|
total_sg_needed = rd_dev->rd_page_count;
|
|
|
|
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
|
|
|
|
sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
|
|
if (!sg_table) {
|
|
pr_err("Unable to allocate memory for Ramdisk"
|
|
" scatterlist tables\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rd_dev->sg_table_array = sg_table;
|
|
rd_dev->sg_table_count = sg_tables;
|
|
|
|
rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
|
|
" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
|
|
rd_dev->rd_dev_id, rd_dev->rd_page_count,
|
|
rd_dev->sg_table_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rd_release_prot_space(struct rd_dev *rd_dev)
|
|
{
|
|
u32 page_count;
|
|
|
|
if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count)
|
|
return;
|
|
|
|
page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
|
|
rd_dev->sg_prot_count);
|
|
|
|
pr_debug("CORE_RD[%u] - Released protection space for Ramdisk"
|
|
" Device ID: %u, pages %u in %u tables total bytes %lu\n",
|
|
rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
|
|
rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
|
|
|
|
rd_dev->sg_prot_array = NULL;
|
|
rd_dev->sg_prot_count = 0;
|
|
}
|
|
|
|
static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
|
|
{
|
|
struct rd_dev_sg_table *sg_table;
|
|
u32 total_sg_needed, sg_tables;
|
|
u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
|
|
sizeof(struct scatterlist));
|
|
int rc;
|
|
|
|
if (rd_dev->rd_flags & RDF_NULLIO)
|
|
return 0;
|
|
/*
|
|
* prot_length=8byte dif data
|
|
* tot sg needed = rd_page_count * (PGSZ/block_size) *
|
|
* (prot_length/block_size) + pad
|
|
* PGSZ canceled each other.
|
|
*/
|
|
total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
|
|
|
|
sg_tables = (total_sg_needed / max_sg_per_table) + 1;
|
|
|
|
sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
|
|
if (!sg_table) {
|
|
pr_err("Unable to allocate memory for Ramdisk protection"
|
|
" scatterlist tables\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rd_dev->sg_prot_array = sg_table;
|
|
rd_dev->sg_prot_count = sg_tables;
|
|
|
|
rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of"
|
|
" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
|
|
rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
|
|
{
|
|
struct rd_dev *rd_dev;
|
|
struct rd_host *rd_host = hba->hba_ptr;
|
|
|
|
rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
|
|
if (!rd_dev) {
|
|
pr_err("Unable to allocate memory for struct rd_dev\n");
|
|
return NULL;
|
|
}
|
|
|
|
rd_dev->rd_host = rd_host;
|
|
|
|
return &rd_dev->dev;
|
|
}
|
|
|
|
static int rd_configure_device(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
struct rd_host *rd_host = dev->se_hba->hba_ptr;
|
|
int ret;
|
|
|
|
if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
|
|
pr_debug("Missing rd_pages= parameter\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = rd_build_device_space(rd_dev);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
|
|
dev->dev_attrib.hw_max_sectors = UINT_MAX;
|
|
dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
|
|
dev->dev_attrib.is_nonrot = 1;
|
|
|
|
rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
|
|
|
|
pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
|
|
" %u pages in %u tables, %lu total bytes\n",
|
|
rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
|
|
rd_dev->sg_table_count,
|
|
(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
rd_release_device_space(rd_dev);
|
|
return ret;
|
|
}
|
|
|
|
static void rd_dev_call_rcu(struct rcu_head *p)
|
|
{
|
|
struct se_device *dev = container_of(p, struct se_device, rcu_head);
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
kfree(rd_dev);
|
|
}
|
|
|
|
static void rd_free_device(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
rd_release_device_space(rd_dev);
|
|
call_rcu(&dev->rcu_head, rd_dev_call_rcu);
|
|
}
|
|
|
|
static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
|
|
{
|
|
struct rd_dev_sg_table *sg_table;
|
|
u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
|
|
sizeof(struct scatterlist));
|
|
|
|
i = page / sg_per_table;
|
|
if (i < rd_dev->sg_table_count) {
|
|
sg_table = &rd_dev->sg_table_array[i];
|
|
if ((sg_table->page_start_offset <= page) &&
|
|
(sg_table->page_end_offset >= page))
|
|
return sg_table;
|
|
}
|
|
|
|
pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
|
|
page);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
|
|
{
|
|
struct rd_dev_sg_table *sg_table;
|
|
u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
|
|
sizeof(struct scatterlist));
|
|
|
|
i = page / sg_per_table;
|
|
if (i < rd_dev->sg_prot_count) {
|
|
sg_table = &rd_dev->sg_prot_array[i];
|
|
if ((sg_table->page_start_offset <= page) &&
|
|
(sg_table->page_end_offset >= page))
|
|
return sg_table;
|
|
}
|
|
|
|
pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
|
|
page);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
|
|
{
|
|
struct se_device *se_dev = cmd->se_dev;
|
|
struct rd_dev *dev = RD_DEV(se_dev);
|
|
struct rd_dev_sg_table *prot_table;
|
|
struct scatterlist *prot_sg;
|
|
u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
|
|
u32 prot_offset, prot_page;
|
|
u32 prot_npages __maybe_unused;
|
|
u64 tmp;
|
|
sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
tmp = cmd->t_task_lba * se_dev->prot_length;
|
|
prot_offset = do_div(tmp, PAGE_SIZE);
|
|
prot_page = tmp;
|
|
|
|
prot_table = rd_get_prot_table(dev, prot_page);
|
|
if (!prot_table)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
prot_sg = &prot_table->sg_table[prot_page -
|
|
prot_table->page_start_offset];
|
|
|
|
if (is_read)
|
|
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
|
|
prot_sg, prot_offset);
|
|
else
|
|
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
|
|
cmd->t_prot_sg, 0);
|
|
|
|
if (!rc)
|
|
sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static sense_reason_t
|
|
rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct se_device *se_dev = cmd->se_dev;
|
|
struct rd_dev *dev = RD_DEV(se_dev);
|
|
struct rd_dev_sg_table *table;
|
|
struct scatterlist *rd_sg;
|
|
struct sg_mapping_iter m;
|
|
u32 rd_offset;
|
|
u32 rd_size;
|
|
u32 rd_page;
|
|
u32 src_len;
|
|
u64 tmp;
|
|
sense_reason_t rc;
|
|
|
|
if (dev->rd_flags & RDF_NULLIO) {
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
|
|
rd_offset = do_div(tmp, PAGE_SIZE);
|
|
rd_page = tmp;
|
|
rd_size = cmd->data_length;
|
|
|
|
table = rd_get_sg_table(dev, rd_page);
|
|
if (!table)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
rd_sg = &table->sg_table[rd_page - table->page_start_offset];
|
|
|
|
pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
|
|
dev->rd_dev_id,
|
|
data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
|
|
cmd->t_task_lba, rd_size, rd_page, rd_offset);
|
|
|
|
if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
|
|
data_direction == DMA_TO_DEVICE) {
|
|
rc = rd_do_prot_rw(cmd, false);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
src_len = PAGE_SIZE - rd_offset;
|
|
sg_miter_start(&m, sgl, sgl_nents,
|
|
data_direction == DMA_FROM_DEVICE ?
|
|
SG_MITER_TO_SG : SG_MITER_FROM_SG);
|
|
while (rd_size) {
|
|
u32 len;
|
|
void *rd_addr;
|
|
|
|
sg_miter_next(&m);
|
|
if (!(u32)m.length) {
|
|
pr_debug("RD[%u]: invalid sgl %p len %zu\n",
|
|
dev->rd_dev_id, m.addr, m.length);
|
|
sg_miter_stop(&m);
|
|
return TCM_INCORRECT_AMOUNT_OF_DATA;
|
|
}
|
|
len = min((u32)m.length, src_len);
|
|
if (len > rd_size) {
|
|
pr_debug("RD[%u]: size underrun page %d offset %d "
|
|
"size %d\n", dev->rd_dev_id,
|
|
rd_page, rd_offset, rd_size);
|
|
len = rd_size;
|
|
}
|
|
m.consumed = len;
|
|
|
|
rd_addr = sg_virt(rd_sg) + rd_offset;
|
|
|
|
if (data_direction == DMA_FROM_DEVICE)
|
|
memcpy(m.addr, rd_addr, len);
|
|
else
|
|
memcpy(rd_addr, m.addr, len);
|
|
|
|
rd_size -= len;
|
|
if (!rd_size)
|
|
continue;
|
|
|
|
src_len -= len;
|
|
if (src_len) {
|
|
rd_offset += len;
|
|
continue;
|
|
}
|
|
|
|
/* rd page completed, next one please */
|
|
rd_page++;
|
|
rd_offset = 0;
|
|
src_len = PAGE_SIZE;
|
|
if (rd_page <= table->page_end_offset) {
|
|
rd_sg++;
|
|
continue;
|
|
}
|
|
|
|
table = rd_get_sg_table(dev, rd_page);
|
|
if (!table) {
|
|
sg_miter_stop(&m);
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
/* since we increment, the first sg entry is correct */
|
|
rd_sg = table->sg_table;
|
|
}
|
|
sg_miter_stop(&m);
|
|
|
|
if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
|
|
data_direction == DMA_FROM_DEVICE) {
|
|
rc = rd_do_prot_rw(cmd, true);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
target_complete_cmd(cmd, SAM_STAT_GOOD);
|
|
return 0;
|
|
}
|
|
|
|
enum {
|
|
Opt_rd_pages, Opt_rd_nullio, Opt_err
|
|
};
|
|
|
|
static match_table_t tokens = {
|
|
{Opt_rd_pages, "rd_pages=%d"},
|
|
{Opt_rd_nullio, "rd_nullio=%d"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static ssize_t rd_set_configfs_dev_params(struct se_device *dev,
|
|
const char *page, ssize_t count)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
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, ",\n")) != 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;
|
|
pr_debug("RAMDISK: Referencing Page"
|
|
" Count: %u\n", rd_dev->rd_page_count);
|
|
rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
|
|
break;
|
|
case Opt_rd_nullio:
|
|
match_int(args, &arg);
|
|
if (arg != 1)
|
|
break;
|
|
|
|
pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg);
|
|
rd_dev->rd_flags |= RDF_NULLIO;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
kfree(orig);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
|
|
static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n",
|
|
rd_dev->rd_dev_id);
|
|
bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu"
|
|
" SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count,
|
|
PAGE_SIZE, rd_dev->sg_table_count,
|
|
!!(rd_dev->rd_flags & RDF_NULLIO));
|
|
return bl;
|
|
}
|
|
|
|
static sector_t rd_get_blocks(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
|
|
dev->dev_attrib.block_size) - 1;
|
|
|
|
return blocks_long;
|
|
}
|
|
|
|
static int rd_init_prot(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
if (!dev->dev_attrib.pi_prot_type)
|
|
return 0;
|
|
|
|
return rd_build_prot_space(rd_dev, dev->prot_length,
|
|
dev->dev_attrib.block_size);
|
|
}
|
|
|
|
static void rd_free_prot(struct se_device *dev)
|
|
{
|
|
struct rd_dev *rd_dev = RD_DEV(dev);
|
|
|
|
rd_release_prot_space(rd_dev);
|
|
}
|
|
|
|
static struct sbc_ops rd_sbc_ops = {
|
|
.execute_rw = rd_execute_rw,
|
|
};
|
|
|
|
static sense_reason_t
|
|
rd_parse_cdb(struct se_cmd *cmd)
|
|
{
|
|
return sbc_parse_cdb(cmd, &rd_sbc_ops);
|
|
}
|
|
|
|
static const struct target_backend_ops rd_mcp_ops = {
|
|
.name = "rd_mcp",
|
|
.inquiry_prod = "RAMDISK-MCP",
|
|
.inquiry_rev = RD_MCP_VERSION,
|
|
.attach_hba = rd_attach_hba,
|
|
.detach_hba = rd_detach_hba,
|
|
.alloc_device = rd_alloc_device,
|
|
.configure_device = rd_configure_device,
|
|
.free_device = rd_free_device,
|
|
.parse_cdb = rd_parse_cdb,
|
|
.set_configfs_dev_params = rd_set_configfs_dev_params,
|
|
.show_configfs_dev_params = rd_show_configfs_dev_params,
|
|
.get_device_type = sbc_get_device_type,
|
|
.get_blocks = rd_get_blocks,
|
|
.init_prot = rd_init_prot,
|
|
.free_prot = rd_free_prot,
|
|
.tb_dev_attrib_attrs = sbc_attrib_attrs,
|
|
};
|
|
|
|
int __init rd_module_init(void)
|
|
{
|
|
return transport_backend_register(&rd_mcp_ops);
|
|
}
|
|
|
|
void rd_module_exit(void)
|
|
{
|
|
target_backend_unregister(&rd_mcp_ops);
|
|
}
|