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target: misc ramdisk backend cleanups

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Remove various leftovers of the old direct/indirect split, as well as the
unused rd_request structure and a couple unused defines and fields.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2012-03-26 04:56:41 -04:00 • committed by Nicholas Bellinger
parent b0d7994660
commit 8feb58d04b
2 changed files with 41 additions and 125 deletions
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147
drivers/target/target_core_rd.c
View file

@ -199,10 +199,7 @@ static int rd_build_device_space(struct rd_dev *rd_dev)
return 0; return 0;
} }
static void *rd_allocate_virtdevice( static void *rd_allocate_virtdevice(struct se_hba *hba, const char *name)
struct se_hba *hba,
const char *name,
int rd_direct)
{ {
struct rd_dev *rd_dev; struct rd_dev *rd_dev;
struct rd_host *rd_host = hba->hba_ptr; struct rd_host *rd_host = hba->hba_ptr;
@ -214,25 +211,12 @@ static void *rd_allocate_virtdevice(
} }
rd_dev->rd_host = rd_host; rd_dev->rd_host = rd_host;
rd_dev->rd_direct = rd_direct;
return rd_dev; return rd_dev;
} }
static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) static struct se_device *rd_create_virtdevice(struct se_hba *hba,
{ struct se_subsystem_dev *se_dev, void *p)
return rd_allocate_virtdevice(hba, name, 0);
}
/* rd_create_virtdevice():
*
*
*/
static struct se_device *rd_create_virtdevice(
struct se_hba *hba,
struct se_subsystem_dev *se_dev,
void *p,
int rd_direct)
{ {
struct se_device *dev; struct se_device *dev;
struct se_dev_limits dev_limits; struct se_dev_limits dev_limits;
@ -247,9 +231,8 @@ static struct se_device *rd_create_virtdevice(
if (ret < 0) if (ret < 0)
goto fail; goto fail;
snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); snprintf(prod, 16, "RAMDISK-MCP");
snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : snprintf(rev, 4, "%s", RD_MCP_VERSION);
RD_MCP_VERSION);
dev_limits.limits.logical_block_size = RD_BLOCKSIZE; dev_limits.limits.logical_block_size = RD_BLOCKSIZE;
dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS;
@ -264,12 +247,10 @@ static struct se_device *rd_create_virtdevice(
goto fail; goto fail;
rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
rd_dev->rd_queue_depth = dev->queue_depth;
pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
" %u pages in %u tables, %lu total bytes\n", " %u pages in %u tables, %lu total bytes\n",
rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
"DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count,
rd_dev->sg_table_count, rd_dev->sg_table_count,
(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
@ -280,18 +261,6 @@ static struct se_device *rd_create_virtdevice(
return ERR_PTR(ret); return ERR_PTR(ret);
} }
static struct se_device *rd_MEMCPY_create_virtdevice(
struct se_hba *hba,
struct se_subsystem_dev *se_dev,
void *p)
{
return rd_create_virtdevice(hba, se_dev, p, 0);
}
/* rd_free_device(): (Part of se_subsystem_api_t template)
*
*
*/
static void rd_free_device(void *p) static void rd_free_device(void *p)
{ {
struct rd_dev *rd_dev = p; struct rd_dev *rd_dev = p;
@ -300,29 +269,12 @@ static void rd_free_device(void *p)
kfree(rd_dev); kfree(rd_dev);
} }
static inline struct rd_request *RD_REQ(struct se_task *task)
{
return container_of(task, struct rd_request, rd_task);
}
static struct se_task * static struct se_task *
rd_alloc_task(unsigned char *cdb) rd_alloc_task(unsigned char *cdb)
{ {
struct rd_request *rd_req; return kzalloc(sizeof(struct se_task), GFP_KERNEL);
rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL);
if (!rd_req) {
pr_err("Unable to allocate struct rd_request\n");
return NULL;
}
return &rd_req->rd_task;
} }
/* rd_get_sg_table():
*
*
*/
static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
{ {
u32 i; u32 i;
@ -341,31 +293,41 @@ static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
return NULL; return NULL;
} }
static int rd_MEMCPY(struct rd_request *req, u32 read_rd) static int rd_do_task(struct se_task *task)
{ {
struct se_task *task = &req->rd_task; struct se_device *se_dev = task->task_se_cmd->se_dev;
struct rd_dev *dev = req->rd_task.task_se_cmd->se_dev->dev_ptr; struct rd_dev *dev = se_dev->dev_ptr;
struct rd_dev_sg_table *table; struct rd_dev_sg_table *table;
struct scatterlist *rd_sg; struct scatterlist *rd_sg;
struct sg_mapping_iter m; struct sg_mapping_iter m;
u32 rd_offset = req->rd_offset; u32 rd_offset;
u32 rd_size;
u32 rd_page;
u32 src_len; u32 src_len;
u64 tmp;
table = rd_get_sg_table(dev, req->rd_page); tmp = task->task_lba * se_dev->se_sub_dev->se_dev_attrib.block_size;
rd_offset = do_div(tmp, PAGE_SIZE);
rd_page = tmp;
rd_size = task->task_size;
table = rd_get_sg_table(dev, rd_page);
if (!table) if (!table)
return -EINVAL; return -EINVAL;
rd_sg = &table->sg_table[req->rd_page - table->page_start_offset]; 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", pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
dev->rd_dev_id, read_rd ? "Read" : "Write", dev->rd_dev_id,
task->task_lba, req->rd_size, req->rd_page, task->task_data_direction == DMA_FROM_DEVICE ?
rd_offset); "Read" : "Write",
task->task_lba, rd_size, rd_page, rd_offset);
src_len = PAGE_SIZE - rd_offset; src_len = PAGE_SIZE - rd_offset;
sg_miter_start(&m, task->task_sg, task->task_sg_nents, sg_miter_start(&m, task->task_sg, task->task_sg_nents,
read_rd ? SG_MITER_TO_SG : SG_MITER_FROM_SG); task->task_data_direction == DMA_FROM_DEVICE ?
while (req->rd_size) { SG_MITER_TO_SG : SG_MITER_FROM_SG);
while (rd_size) {
u32 len; u32 len;
void *rd_addr; void *rd_addr;
@ -375,13 +337,13 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
rd_addr = sg_virt(rd_sg) + rd_offset; rd_addr = sg_virt(rd_sg) + rd_offset;
if (read_rd) if (task->task_data_direction == DMA_FROM_DEVICE)
memcpy(m.addr, rd_addr, len); memcpy(m.addr, rd_addr, len);
else else
memcpy(rd_addr, m.addr, len); memcpy(rd_addr, m.addr, len);
req->rd_size -= len; rd_size -= len;
if (!req->rd_size) if (!rd_size)
continue; continue;
src_len -= len; src_len -= len;
@ -391,15 +353,15 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
} }
/* rd page completed, next one please */ /* rd page completed, next one please */
req->rd_page++; rd_page++;
rd_offset = 0; rd_offset = 0;
src_len = PAGE_SIZE; src_len = PAGE_SIZE;
if (req->rd_page <= table->page_end_offset) { if (rd_page <= table->page_end_offset) {
rd_sg++; rd_sg++;
continue; continue;
} }
table = rd_get_sg_table(dev, req->rd_page); table = rd_get_sg_table(dev, rd_page);
if (!table) { if (!table) {
sg_miter_stop(&m); sg_miter_stop(&m);
return -EINVAL; return -EINVAL;
@ -409,41 +371,15 @@ static int rd_MEMCPY(struct rd_request *req, u32 read_rd)
rd_sg = table->sg_table; rd_sg = table->sg_table;
} }
sg_miter_stop(&m); sg_miter_stop(&m);
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->task_se_cmd->se_dev;
struct rd_request *req = RD_REQ(task);
u64 tmp;
int ret;
tmp = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size;
req->rd_offset = do_div(tmp, PAGE_SIZE);
req->rd_page = tmp;
req->rd_size = task->task_size;
ret = rd_MEMCPY(req, task->task_data_direction == DMA_FROM_DEVICE);
if (ret != 0)
return ret;
task->task_scsi_status = GOOD; task->task_scsi_status = GOOD;
transport_complete_task(task, 1); transport_complete_task(task, 1);
return 0; return 0;
} }
/* rd_free_task(): (Part of se_subsystem_api_t template)
*
*
*/
static void rd_free_task(struct se_task *task) static void rd_free_task(struct se_task *task)
{ {
kfree(RD_REQ(task)); kfree(task);
} }
enum { enum {
@ -512,9 +448,8 @@ static ssize_t rd_show_configfs_dev_params(
char *b) char *b)
{ {
struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; struct rd_dev *rd_dev = se_dev->se_dev_su_ptr;
ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n",
rd_dev->rd_dev_id, (rd_dev->rd_direct) ? rd_dev->rd_dev_id);
"rd_direct" : "rd_mcp");
bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu"
" SG_table_count: %u\n", rd_dev->rd_page_count, " SG_table_count: %u\n", rd_dev->rd_page_count,
PAGE_SIZE, rd_dev->sg_table_count); PAGE_SIZE, rd_dev->sg_table_count);
@ -545,11 +480,11 @@ static struct se_subsystem_api rd_mcp_template = {
.transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV,
.attach_hba = rd_attach_hba, .attach_hba = rd_attach_hba,
.detach_hba = rd_detach_hba, .detach_hba = rd_detach_hba,
.allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, .allocate_virtdevice = rd_allocate_virtdevice,
.create_virtdevice = rd_MEMCPY_create_virtdevice, .create_virtdevice = rd_create_virtdevice,
.free_device = rd_free_device, .free_device = rd_free_device,
.alloc_task = rd_alloc_task, .alloc_task = rd_alloc_task,
.do_task = rd_MEMCPY_do_task, .do_task = rd_do_task,
.free_task = rd_free_task, .free_task = rd_free_task,
.check_configfs_dev_params = rd_check_configfs_dev_params, .check_configfs_dev_params = rd_check_configfs_dev_params,
.set_configfs_dev_params = rd_set_configfs_dev_params, .set_configfs_dev_params = rd_set_configfs_dev_params,

19
drivers/target/target_core_rd.h
View file

@ -2,7 +2,6 @@
#define TARGET_CORE_RD_H #define TARGET_CORE_RD_H
#define RD_HBA_VERSION "v4.0" #define RD_HBA_VERSION "v4.0"
#define RD_DR_VERSION "4.0"
#define RD_MCP_VERSION "4.0" #define RD_MCP_VERSION "4.0"
/* Largest piece of memory kmalloc can allocate */ /* Largest piece of memory kmalloc can allocate */
@ -16,22 +15,6 @@
int __init rd_module_init(void); int __init rd_module_init(void);
void rd_module_exit(void); void rd_module_exit(void);
#define RRF_EMULATE_CDB 0x01
#define RRF_GOT_LBA 0x02
struct rd_request {
struct se_task rd_task;
/* Offset from start of page */
u32 rd_offset;
/* Starting page in Ramdisk for request */
u32 rd_page;
/* Total number of pages needed for request */
u32 rd_page_count;
/* Scatterlist count */
u32 rd_size;
} ____cacheline_aligned;
struct rd_dev_sg_table { struct rd_dev_sg_table {
u32 page_start_offset; u32 page_start_offset;
u32 page_end_offset; u32 page_end_offset;
@ -42,7 +25,6 @@ struct rd_dev_sg_table {
#define RDF_HAS_PAGE_COUNT 0x01 #define RDF_HAS_PAGE_COUNT 0x01
struct rd_dev { struct rd_dev {
int rd_direct;
u32 rd_flags; u32 rd_flags;
/* Unique Ramdisk Device ID in Ramdisk HBA */ /* Unique Ramdisk Device ID in Ramdisk HBA */
u32 rd_dev_id; u32 rd_dev_id;
@ -50,7 +32,6 @@ struct rd_dev {
u32 rd_page_count; u32 rd_page_count;
/* Number of SG tables in sg_table_array */ /* Number of SG tables in sg_table_array */
u32 sg_table_count; u32 sg_table_count;
u32 rd_queue_depth;
/* Array of rd_dev_sg_table_t containing scatterlists */ /* Array of rd_dev_sg_table_t containing scatterlists */
struct rd_dev_sg_table *sg_table_array; struct rd_dev_sg_table *sg_table_array;
/* Ramdisk HBA device is connected to */ /* Ramdisk HBA device is connected to */