[mirror_ubuntu-bionic-kernel.git] / drivers / target / target_core_rd.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/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.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);
}

/*	rd_attach_hba(): (Part of se_subsystem_api_t template)
 *
 *
 */
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_MOD_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) {
		sg_per_table = (total_sg_needed > max_sg_per_table) ?
			max_sg_per_table : total_sg_needed;

		sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
				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);

		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;

	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_free_device(struct se_device *dev)
{
	struct rd_dev *rd_dev = RD_DEV(dev);

	rd_release_device_space(rd_dev);
	kfree(rd_dev);
}

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_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 && data_direction == DMA_TO_DEVICE) {
		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;

		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];

		rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0,
					  prot_sg, prot_offset);
		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 && data_direction == DMA_FROM_DEVICE) {
		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;

		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];

		rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
					 prot_sg, prot_offset);
		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 struct se_subsystem_api rd_mcp_template = {
	.name			= "rd_mcp",
	.inquiry_prod		= "RAMDISK-MCP",
	.inquiry_rev		= RD_MCP_VERSION,
	.transport_type		= TRANSPORT_PLUGIN_VHBA_VDEV,
	.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,
};

int __init rd_module_init(void)
{
	int ret;

	ret = transport_subsystem_register(&rd_mcp_template);
	if (ret < 0) {
		return ret;
	}

	return 0;
}

void rd_module_exit(void)
{
	transport_subsystem_release(&rd_mcp_template);
}
Commit	Line	Data
c66ac9db NB	1	/*******************************************************************************
	2	* Filename: target_core_rd.c
	3	*
	4	* This file contains the Storage Engine <-> Ramdisk transport
	5	* specific functions.
	6	*
4c76251e	7	* (c) Copyright 2003-2013 Datera, Inc.
c66ac9db NB	8	*
	9	* Nicholas A. Bellinger <nab@kernel.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	24	*
	25	******************************************************************************/
	26
c66ac9db NB	27	#include <linux/string.h>
	28	#include <linux/parser.h>
	29	#include <linux/timer.h>
c66ac9db NB	30	#include <linux/slab.h>
c66ac9db NB	31	#include <linux/spinlock.h>
c66ac9db NB	32	#include <scsi/scsi.h>
	33	#include <scsi/scsi_host.h>
	34
	35	#include <target/target_core_base.h>
c4795fb2	36	#include <target/target_core_backend.h>
c66ac9db NB	37
	38	#include "target_core_rd.h"
	39
0fd97ccf CH	40	static inline struct rd_dev RD_DEV(struct se_device dev)
	41	{
	42	return container_of(dev, struct rd_dev, dev);
	43	}
c66ac9db	44
c66ac9db NB	45	/* rd_attach_hba(): (Part of se_subsystem_api_t template)
	46	*
	47	*
	48	*/
	49	static int rd_attach_hba(struct se_hba *hba, u32 host_id)
	50	{
	51	struct rd_host *rd_host;
	52
	53	rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL);
6708bb27 AG	54	if (!rd_host) {
6708bb27 AG	55	pr_err("Unable to allocate memory for struct rd_host\n");
c66ac9db NB	56	return -ENOMEM;
	57	}
	58
	59	rd_host->rd_host_id = host_id;
	60
5951146d	61	hba->hba_ptr = rd_host;
c66ac9db	62
6708bb27	63	pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
c66ac9db NB	64	" Generic Target Core Stack %s\n", hba->hba_id,
c66ac9db NB	65	RD_HBA_VERSION, TARGET_CORE_MOD_VERSION);
c66ac9db NB	66
	67	return 0;
	68	}
	69
	70	static void rd_detach_hba(struct se_hba *hba)
	71	{
	72	struct rd_host *rd_host = hba->hba_ptr;
	73
6708bb27	74	pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
c66ac9db NB	75	" Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
	76
	77	kfree(rd_host);
	78	hba->hba_ptr = NULL;
	79	}
	80
4442dc8a NB	81	static u32 rd_release_sgl_table(struct rd_dev rd_dev, struct rd_dev_sg_table sg_table,
4442dc8a NB	82	u32 sg_table_count)
c66ac9db	83	{
c66ac9db NB	84	struct page *pg;
c66ac9db NB	85	struct scatterlist *sg;
4442dc8a	86	u32 i, j, page_count = 0, sg_per_table;
c66ac9db	87
4442dc8a	88	for (i = 0; i < sg_table_count; i++) {
c66ac9db NB	89	sg = sg_table[i].sg_table;
	90	sg_per_table = sg_table[i].rd_sg_count;
	91
	92	for (j = 0; j < sg_per_table; j++) {
	93	pg = sg_page(&sg[j]);
6708bb27	94	if (pg) {
c66ac9db NB	95	__free_page(pg);
	96	page_count++;
	97	}
	98	}
c66ac9db NB	99	kfree(sg);
	100	}
	101
4442dc8a NB	102	kfree(sg_table);
	103	return page_count;
	104	}
	105
	106	static void rd_release_device_space(struct rd_dev *rd_dev)
	107	{
	108	u32 page_count;
	109
	110	if (!rd_dev->sg_table_array \|\| !rd_dev->sg_table_count)
	111	return;
	112
	113	page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
	114	rd_dev->sg_table_count);
	115
6708bb27	116	pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
c66ac9db NB	117	" Device ID: %u, pages %u in %u tables total bytes %lu\n",
	118	rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
	119	rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
	120
c66ac9db NB	121	rd_dev->sg_table_array = NULL;
	122	rd_dev->sg_table_count = 0;
	123	}
	124
	125
	126	/* rd_build_device_space():
	127	*
	128	*
	129	*/
4442dc8a NB	130	static int rd_allocate_sgl_table(struct rd_dev rd_dev, struct rd_dev_sg_table sg_table,
4442dc8a NB	131	u32 total_sg_needed, unsigned char init_payload)
c66ac9db	132	{
4442dc8a	133	u32 i = 0, j, page_offset = 0, sg_per_table;
c66ac9db NB	134	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
c66ac9db NB	135	sizeof(struct scatterlist));
c66ac9db NB	136	struct page *pg;
c66ac9db NB	137	struct scatterlist *sg;
4442dc8a	138	unsigned char *p;
c66ac9db NB	139
	140	while (total_sg_needed) {
	141	sg_per_table = (total_sg_needed > max_sg_per_table) ?
	142	max_sg_per_table : total_sg_needed;
	143
	144	sg = kzalloc(sg_per_table * sizeof(struct scatterlist),
	145	GFP_KERNEL);
6708bb27 AG	146	if (!sg) {
6708bb27 AG	147	pr_err("Unable to allocate scatterlist array"
c66ac9db	148	" for struct rd_dev\n");
065f9716	149	return -ENOMEM;
c66ac9db NB	150	}
c66ac9db NB	151
6708bb27	152	sg_init_table(sg, sg_per_table);
c66ac9db NB	153
	154	sg_table[i].sg_table = sg;
	155	sg_table[i].rd_sg_count = sg_per_table;
	156	sg_table[i].page_start_offset = page_offset;
	157	sg_table[i++].page_end_offset = (page_offset + sg_per_table)
	158	- 1;
	159
	160	for (j = 0; j < sg_per_table; j++) {
	161	pg = alloc_pages(GFP_KERNEL, 0);
6708bb27 AG	162	if (!pg) {
6708bb27 AG	163	pr_err("Unable to allocate scatterlist"
c66ac9db	164	" pages for struct rd_dev_sg_table\n");
065f9716	165	return -ENOMEM;
c66ac9db NB	166	}
	167	sg_assign_page(&sg[j], pg);
	168	sg[j].length = PAGE_SIZE;
4442dc8a NB	169
	170	p = kmap(pg);
	171	memset(p, init_payload, PAGE_SIZE);
	172	kunmap(pg);
c66ac9db NB	173	}
	174
	175	page_offset += sg_per_table;
	176	total_sg_needed -= sg_per_table;
	177	}
	178
4442dc8a NB	179	return 0;
	180	}
	181
	182	static int rd_build_device_space(struct rd_dev *rd_dev)
	183	{
	184	struct rd_dev_sg_table *sg_table;
	185	u32 sg_tables, total_sg_needed;
	186	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
	187	sizeof(struct scatterlist));
	188	int rc;
	189
	190	if (rd_dev->rd_page_count <= 0) {
	191	pr_err("Illegal page count: %u for Ramdisk device\n",
	192	rd_dev->rd_page_count);
	193	return -EINVAL;
	194	}
	195
	196	/* Don't need backing pages for NULLIO */
	197	if (rd_dev->rd_flags & RDF_NULLIO)
	198	return 0;
	199
	200	total_sg_needed = rd_dev->rd_page_count;
	201
	202	sg_tables = (total_sg_needed / max_sg_per_table) + 1;
	203
	204	sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
	205	if (!sg_table) {
	206	pr_err("Unable to allocate memory for Ramdisk"
	207	" scatterlist tables\n");
	208	return -ENOMEM;
	209	}
	210
	211	rd_dev->sg_table_array = sg_table;
	212	rd_dev->sg_table_count = sg_tables;
	213
	214	rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
	215	if (rc)
	216	return rc;
	217
6708bb27	218	pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
4442dc8a NB	219	" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
	220	rd_dev->rd_dev_id, rd_dev->rd_page_count,
	221	rd_dev->sg_table_count);
c66ac9db NB	222
	223	return 0;
	224	}
	225
d7e8eb5d NB	226	static void rd_release_prot_space(struct rd_dev *rd_dev)
	227	{
	228	u32 page_count;
	229
	230	if (!rd_dev->sg_prot_array \|\| !rd_dev->sg_prot_count)
	231	return;
	232
	233	page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
	234	rd_dev->sg_prot_count);
	235
	236	pr_debug("CORE_RD[%u] - Released protection space for Ramdisk"
	237	" Device ID: %u, pages %u in %u tables total bytes %lu\n",
	238	rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
	239	rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
	240
	241	rd_dev->sg_prot_array = NULL;
	242	rd_dev->sg_prot_count = 0;
	243	}
	244
9d2e59f2	245	static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
d7e8eb5d NB	246	{
	247	struct rd_dev_sg_table *sg_table;
	248	u32 total_sg_needed, sg_tables;
	249	u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
	250	sizeof(struct scatterlist));
	251	int rc;
	252
	253	if (rd_dev->rd_flags & RDF_NULLIO)
	254	return 0;
9d2e59f2 QT	255	/*
	256	* prot_length=8byte dif data
	257	* tot sg needed = rd_page_count * (PGSZ/block_size) *
	258	* (prot_length/block_size) + pad
	259	* PGSZ canceled each other.
	260	*/
	261	total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
d7e8eb5d NB	262
	263	sg_tables = (total_sg_needed / max_sg_per_table) + 1;
	264
	265	sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL);
	266	if (!sg_table) {
	267	pr_err("Unable to allocate memory for Ramdisk protection"
	268	" scatterlist tables\n");
	269	return -ENOMEM;
	270	}
	271
	272	rd_dev->sg_prot_array = sg_table;
	273	rd_dev->sg_prot_count = sg_tables;
	274
	275	rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
	276	if (rc)
	277	return rc;
	278
	279	pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of"
	280	" %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
	281	rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count);
	282
	283	return 0;
	284	}
	285
0fd97ccf	286	static struct se_device rd_alloc_device(struct se_hba hba, const char *name)
c66ac9db NB	287	{
	288	struct rd_dev *rd_dev;
	289	struct rd_host *rd_host = hba->hba_ptr;
	290
	291	rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL);
6708bb27 AG	292	if (!rd_dev) {
6708bb27 AG	293	pr_err("Unable to allocate memory for struct rd_dev\n");
c66ac9db NB	294	return NULL;
	295	}
	296
	297	rd_dev->rd_host = rd_host;
c66ac9db	298
0fd97ccf	299	return &rd_dev->dev;
c66ac9db NB	300	}
c66ac9db NB	301
0fd97ccf	302	static int rd_configure_device(struct se_device *dev)
c66ac9db	303	{
0fd97ccf CH	304	struct rd_dev *rd_dev = RD_DEV(dev);
	305	struct rd_host *rd_host = dev->se_hba->hba_ptr;
	306	int ret;
c66ac9db	307
0fd97ccf CH	308	if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
	309	pr_debug("Missing rd_pages= parameter\n");
	310	return -EINVAL;
	311	}
c66ac9db	312
065f9716 DC	313	ret = rd_build_device_space(rd_dev);
065f9716 DC	314	if (ret < 0)
c66ac9db NB	315	goto fail;
c66ac9db NB	316
0fd97ccf CH	317	dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
	318	dev->dev_attrib.hw_max_sectors = UINT_MAX;
	319	dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
c66ac9db NB	320
c66ac9db NB	321	rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
c66ac9db	322
8feb58d0	323	pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
c66ac9db	324	" %u pages in %u tables, %lu total bytes\n",
8feb58d0	325	rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
c66ac9db NB	326	rd_dev->sg_table_count,
	327	(unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
	328
0fd97ccf	329	return 0;
c66ac9db NB	330
	331	fail:
	332	rd_release_device_space(rd_dev);
0fd97ccf	333	return ret;
c66ac9db NB	334	}
c66ac9db NB	335
0fd97ccf	336	static void rd_free_device(struct se_device *dev)
c66ac9db	337	{
0fd97ccf	338	struct rd_dev *rd_dev = RD_DEV(dev);
c66ac9db NB	339
	340	rd_release_device_space(rd_dev);
	341	kfree(rd_dev);
	342	}
	343
c66ac9db NB	344	static struct rd_dev_sg_table rd_get_sg_table(struct rd_dev rd_dev, u32 page)
c66ac9db NB	345	{
c66ac9db	346	struct rd_dev_sg_table *sg_table;
8f67835f MS	347	u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
8f67835f MS	348	sizeof(struct scatterlist));
c66ac9db	349
8f67835f MS	350	i = page / sg_per_table;
8f67835f MS	351	if (i < rd_dev->sg_table_count) {
c66ac9db NB	352	sg_table = &rd_dev->sg_table_array[i];
	353	if ((sg_table->page_start_offset <= page) &&
	354	(sg_table->page_end_offset >= page))
	355	return sg_table;
	356	}
	357
6708bb27	358	pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
c66ac9db NB	359	page);
	360
	361	return NULL;
	362	}
	363
6e611119 NB	364	static struct rd_dev_sg_table rd_get_prot_table(struct rd_dev rd_dev, u32 page)
	365	{
	366	struct rd_dev_sg_table *sg_table;
	367	u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
	368	sizeof(struct scatterlist));
	369
	370	i = page / sg_per_table;
	371	if (i < rd_dev->sg_prot_count) {
	372	sg_table = &rd_dev->sg_prot_array[i];
	373	if ((sg_table->page_start_offset <= page) &&
	374	(sg_table->page_end_offset >= page))
	375	return sg_table;
	376	}
	377
	378	pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
	379	page);
	380
	381	return NULL;
	382	}
	383
de103c93	384	static sense_reason_t
a82a9538 NB	385	rd_execute_rw(struct se_cmd cmd, struct scatterlist sgl, u32 sgl_nents,
a82a9538 NB	386	enum dma_data_direction data_direction)
c66ac9db	387	{
5787cacd	388	struct se_device *se_dev = cmd->se_dev;
0fd97ccf	389	struct rd_dev *dev = RD_DEV(se_dev);
c66ac9db	390	struct rd_dev_sg_table *table;
65b0c78d SAS	391	struct scatterlist *rd_sg;
65b0c78d SAS	392	struct sg_mapping_iter m;
8feb58d0 CH	393	u32 rd_offset;
	394	u32 rd_size;
	395	u32 rd_page;
65b0c78d	396	u32 src_len;
8feb58d0	397	u64 tmp;
6e611119	398	sense_reason_t rc;
c66ac9db	399
52c07423 NB	400	if (dev->rd_flags & RDF_NULLIO) {
	401	target_complete_cmd(cmd, SAM_STAT_GOOD);
	402	return 0;
	403	}
	404
0fd97ccf	405	tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
8feb58d0 CH	406	rd_offset = do_div(tmp, PAGE_SIZE);
8feb58d0 CH	407	rd_page = tmp;
5787cacd	408	rd_size = cmd->data_length;
8feb58d0 CH	409
8feb58d0 CH	410	table = rd_get_sg_table(dev, rd_page);
6708bb27	411	if (!table)
de103c93	412	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db	413
8feb58d0	414	rd_sg = &table->sg_table[rd_page - table->page_start_offset];
6708bb27	415
65b0c78d	416	pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
8feb58d0	417	dev->rd_dev_id,
5787cacd CH	418	data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
5787cacd CH	419	cmd->t_task_lba, rd_size, rd_page, rd_offset);
c66ac9db	420
6e611119 NB	421	if (cmd->prot_type && data_direction == DMA_TO_DEVICE) {
	422	struct rd_dev_sg_table *prot_table;
	423	struct scatterlist *prot_sg;
	424	u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
	425	u32 prot_offset, prot_page;
	426
	427	tmp = cmd->t_task_lba * se_dev->prot_length;
	428	prot_offset = do_div(tmp, PAGE_SIZE);
	429	prot_page = tmp;
	430
	431	prot_table = rd_get_prot_table(dev, prot_page);
	432	if (!prot_table)
	433	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
	434
	435	prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
	436
	437	rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 0,
	438	prot_sg, prot_offset);
	439	if (rc)
	440	return rc;
	441	}
	442
65b0c78d	443	src_len = PAGE_SIZE - rd_offset;
5787cacd CH	444	sg_miter_start(&m, sgl, sgl_nents,
5787cacd CH	445	data_direction == DMA_FROM_DEVICE ?
8feb58d0 CH	446	SG_MITER_TO_SG : SG_MITER_FROM_SG);
8feb58d0 CH	447	while (rd_size) {
65b0c78d SAS	448	u32 len;
65b0c78d SAS	449	void *rd_addr;
c66ac9db	450
65b0c78d	451	sg_miter_next(&m);
bbf344e5 HR	452	if (!(u32)m.length) {
	453	pr_debug("RD[%u]: invalid sgl %p len %zu\n",
	454	dev->rd_dev_id, m.addr, m.length);
	455	sg_miter_stop(&m);
	456	return TCM_INCORRECT_AMOUNT_OF_DATA;
	457	}
65b0c78d	458	len = min((u32)m.length, src_len);
bbf344e5 HR	459	if (len > rd_size) {
	460	pr_debug("RD[%u]: size underrun page %d offset %d "
	461	"size %d\n", dev->rd_dev_id,
	462	rd_page, rd_offset, rd_size);
	463	len = rd_size;
	464	}
65b0c78d	465	m.consumed = len;
c66ac9db	466
65b0c78d	467	rd_addr = sg_virt(rd_sg) + rd_offset;
6708bb27	468
5787cacd	469	if (data_direction == DMA_FROM_DEVICE)
65b0c78d SAS	470	memcpy(m.addr, rd_addr, len);
	471	else
	472	memcpy(rd_addr, m.addr, len);
c66ac9db	473
8feb58d0 CH	474	rd_size -= len;
8feb58d0 CH	475	if (!rd_size)
c66ac9db NB	476	continue;
c66ac9db NB	477
65b0c78d SAS	478	src_len -= len;
	479	if (src_len) {
	480	rd_offset += len;
c66ac9db NB	481	continue;
c66ac9db NB	482	}
6708bb27	483
65b0c78d	484	/* rd page completed, next one please */
8feb58d0	485	rd_page++;
65b0c78d SAS	486	rd_offset = 0;
65b0c78d SAS	487	src_len = PAGE_SIZE;
8feb58d0	488	if (rd_page <= table->page_end_offset) {
65b0c78d	489	rd_sg++;
c66ac9db NB	490	continue;
c66ac9db NB	491	}
6708bb27	492
8feb58d0	493	table = rd_get_sg_table(dev, rd_page);
65b0c78d SAS	494	if (!table) {
65b0c78d SAS	495	sg_miter_stop(&m);
de103c93	496	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
65b0c78d	497	}
c66ac9db	498
65b0c78d SAS	499	/* since we increment, the first sg entry is correct */
65b0c78d SAS	500	rd_sg = table->sg_table;
c66ac9db	501	}
65b0c78d	502	sg_miter_stop(&m);
c66ac9db	503
6e611119 NB	504	if (cmd->prot_type && data_direction == DMA_FROM_DEVICE) {
	505	struct rd_dev_sg_table *prot_table;
	506	struct scatterlist *prot_sg;
	507	u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
	508	u32 prot_offset, prot_page;
	509
	510	tmp = cmd->t_task_lba * se_dev->prot_length;
	511	prot_offset = do_div(tmp, PAGE_SIZE);
	512	prot_page = tmp;
	513
	514	prot_table = rd_get_prot_table(dev, prot_page);
	515	if (!prot_table)
	516	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
	517
	518	prot_sg = &prot_table->sg_table[prot_page - prot_table->page_start_offset];
	519
	520	rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
	521	prot_sg, prot_offset);
	522	if (rc)
	523	return rc;
	524	}
	525
5787cacd	526	target_complete_cmd(cmd, SAM_STAT_GOOD);
03e98c9e	527	return 0;
c66ac9db NB	528	}
c66ac9db NB	529
c66ac9db	530	enum {
52c07423	531	Opt_rd_pages, Opt_rd_nullio, Opt_err
c66ac9db NB	532	};
	533
	534	static match_table_t tokens = {
	535	{Opt_rd_pages, "rd_pages=%d"},
52c07423	536	{Opt_rd_nullio, "rd_nullio=%d"},
c66ac9db NB	537	{Opt_err, NULL}
	538	};
	539
0fd97ccf CH	540	static ssize_t rd_set_configfs_dev_params(struct se_device *dev,
0fd97ccf CH	541	const char *page, ssize_t count)
c66ac9db	542	{
0fd97ccf	543	struct rd_dev *rd_dev = RD_DEV(dev);
c66ac9db NB	544	char orig, ptr, *opts;
	545	substring_t args[MAX_OPT_ARGS];
	546	int ret = 0, arg, token;
	547
	548	opts = kstrdup(page, GFP_KERNEL);
	549	if (!opts)
	550	return -ENOMEM;
	551
	552	orig = opts;
	553
90c161b6	554	while ((ptr = strsep(&opts, ",\n")) != NULL) {
c66ac9db NB	555	if (!*ptr)
	556	continue;
	557
	558	token = match_token(ptr, tokens, args);
	559	switch (token) {
	560	case Opt_rd_pages:
	561	match_int(args, &arg);
	562	rd_dev->rd_page_count = arg;
6708bb27	563	pr_debug("RAMDISK: Referencing Page"
c66ac9db NB	564	" Count: %u\n", rd_dev->rd_page_count);
	565	rd_dev->rd_flags \|= RDF_HAS_PAGE_COUNT;
	566	break;
52c07423 NB	567	case Opt_rd_nullio:
	568	match_int(args, &arg);
	569	if (arg != 1)
	570	break;
	571
	572	pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg);
	573	rd_dev->rd_flags \|= RDF_NULLIO;
	574	break;
c66ac9db NB	575	default:
	576	break;
	577	}
	578	}
	579
	580	kfree(orig);
	581	return (!ret) ? count : ret;
	582	}
	583
0fd97ccf	584	static ssize_t rd_show_configfs_dev_params(struct se_device dev, char b)
c66ac9db	585	{
0fd97ccf	586	struct rd_dev *rd_dev = RD_DEV(dev);
c66ac9db	587
8feb58d0 CH	588	ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n",
8feb58d0 CH	589	rd_dev->rd_dev_id);
c66ac9db	590	bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu"
52c07423 NB	591	" SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count,
	592	PAGE_SIZE, rd_dev->sg_table_count,
	593	!!(rd_dev->rd_flags & RDF_NULLIO));
c66ac9db NB	594	return bl;
	595	}
	596
c66ac9db NB	597	static sector_t rd_get_blocks(struct se_device *dev)
c66ac9db NB	598	{
0fd97ccf CH	599	struct rd_dev *rd_dev = RD_DEV(dev);
0fd97ccf CH	600
c66ac9db	601	unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
0fd97ccf	602	dev->dev_attrib.block_size) - 1;
c66ac9db NB	603
	604	return blocks_long;
	605	}
	606
d7e8eb5d NB	607	static int rd_init_prot(struct se_device *dev)
	608	{
	609	struct rd_dev *rd_dev = RD_DEV(dev);
	610
	611	if (!dev->dev_attrib.pi_prot_type)
	612	return 0;
	613
9d2e59f2 QT	614	return rd_build_prot_space(rd_dev, dev->prot_length,
9d2e59f2 QT	615	dev->dev_attrib.block_size);
d7e8eb5d NB	616	}
	617
	618	static void rd_free_prot(struct se_device *dev)
	619	{
	620	struct rd_dev *rd_dev = RD_DEV(dev);
	621
	622	rd_release_prot_space(rd_dev);
	623	}
	624
9e999a6c	625	static struct sbc_ops rd_sbc_ops = {
0c2ad7d1 CH	626	.execute_rw = rd_execute_rw,
	627	};
	628
de103c93 CH	629	static sense_reason_t
de103c93 CH	630	rd_parse_cdb(struct se_cmd *cmd)
0c2ad7d1	631	{
9e999a6c	632	return sbc_parse_cdb(cmd, &rd_sbc_ops);
0c2ad7d1 CH	633	}
0c2ad7d1 CH	634
c66ac9db NB	635	static struct se_subsystem_api rd_mcp_template = {
c66ac9db NB	636	.name = "rd_mcp",
0fd97ccf CH	637	.inquiry_prod = "RAMDISK-MCP",
0fd97ccf CH	638	.inquiry_rev = RD_MCP_VERSION,
c66ac9db NB	639	.transport_type = TRANSPORT_PLUGIN_VHBA_VDEV,
	640	.attach_hba = rd_attach_hba,
	641	.detach_hba = rd_detach_hba,
0fd97ccf CH	642	.alloc_device = rd_alloc_device,
0fd97ccf CH	643	.configure_device = rd_configure_device,
c66ac9db	644	.free_device = rd_free_device,
0c2ad7d1	645	.parse_cdb = rd_parse_cdb,
c66ac9db NB	646	.set_configfs_dev_params = rd_set_configfs_dev_params,
c66ac9db NB	647	.show_configfs_dev_params = rd_show_configfs_dev_params,
6f23ac8a	648	.get_device_type = sbc_get_device_type,
c66ac9db	649	.get_blocks = rd_get_blocks,
d7e8eb5d NB	650	.init_prot = rd_init_prot,
d7e8eb5d NB	651	.free_prot = rd_free_prot,
c66ac9db NB	652	};
	653
	654	int __init rd_module_init(void)
	655	{
	656	int ret;
	657
c66ac9db NB	658	ret = transport_subsystem_register(&rd_mcp_template);
c66ac9db NB	659	if (ret < 0) {
c66ac9db NB	660	return ret;
	661	}
	662
	663	return 0;
	664	}
	665
	666	void rd_module_exit(void)
	667	{
c66ac9db NB	668	transport_subsystem_release(&rd_mcp_template);
c66ac9db NB	669	}