![Julia Lawall](/assets/img/avatar_default.png)
sg_init_table zeroes its first argument, so the allocation of that argument doesn't have to. the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,n,flags; @@ x = - kcalloc + kmalloc_array (n,sizeof(*x),flags) ... sg_init_table(x,n) // </smpl> Link: https://lore.kernel.org/r/1600601186-7420-3-git-send-email-Julia.Lawall@inria.fr Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
666 lines
16 KiB
C
666 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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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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* (c) Copyright 2003-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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******************************************************************************/
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/highmem.h>
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#include <linux/timer.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <scsi/scsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include "target_core_rd.h"
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static inline struct rd_dev *RD_DEV(struct se_device *dev)
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{
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return container_of(dev, struct rd_dev, dev);
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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(*rd_host), GFP_KERNEL);
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if (!rd_host)
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return -ENOMEM;
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rd_host->rd_host_id = host_id;
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hba->hba_ptr = rd_host;
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pr_debug("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_VERSION);
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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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pr_debug("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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static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
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u32 sg_table_count)
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{
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struct page *pg;
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struct scatterlist *sg;
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u32 i, j, page_count = 0, sg_per_table;
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for (i = 0; i < 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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kfree(sg_table);
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return page_count;
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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 page_count;
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if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
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return;
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page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
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rd_dev->sg_table_count);
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pr_debug("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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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_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
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u32 total_sg_needed, unsigned char init_payload)
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{
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u32 i = 0, j, page_offset = 0, sg_per_table;
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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 page *pg;
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struct scatterlist *sg;
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unsigned char *p;
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while (total_sg_needed) {
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unsigned int chain_entry = 0;
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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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/*
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* Reserve extra element for chain entry
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*/
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if (sg_per_table < total_sg_needed)
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chain_entry = 1;
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sg = kmalloc_array(sg_per_table + chain_entry, sizeof(*sg),
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GFP_KERNEL);
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if (!sg)
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return -ENOMEM;
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sg_init_table(sg, sg_per_table + chain_entry);
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if (i > 0) {
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sg_chain(sg_table[i - 1].sg_table,
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max_sg_per_table + 1, sg);
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}
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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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pr_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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p = kmap(pg);
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memset(p, init_payload, PAGE_SIZE);
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kunmap(pg);
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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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return 0;
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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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struct rd_dev_sg_table *sg_table;
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u32 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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int rc;
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if (rd_dev->rd_page_count <= 0) {
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pr_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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/* Don't need backing pages for NULLIO */
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if (rd_dev->rd_flags & RDF_NULLIO)
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return 0;
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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 = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
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if (!sg_table)
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return -ENOMEM;
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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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rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
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if (rc)
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return rc;
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pr_debug("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_release_prot_space(struct rd_dev *rd_dev)
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{
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u32 page_count;
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if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count)
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return;
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page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
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rd_dev->sg_prot_count);
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pr_debug("CORE_RD[%u] - Released protection 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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rd_dev->sg_prot_array = NULL;
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rd_dev->sg_prot_count = 0;
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}
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static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
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{
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struct rd_dev_sg_table *sg_table;
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u32 total_sg_needed, sg_tables;
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u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
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sizeof(struct scatterlist));
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int rc;
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if (rd_dev->rd_flags & RDF_NULLIO)
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return 0;
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/*
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* prot_length=8byte dif data
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* tot sg needed = rd_page_count * (PGSZ/block_size) *
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* (prot_length/block_size) + pad
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* PGSZ canceled each other.
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*/
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total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
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sg_tables = (total_sg_needed / max_sg_per_table) + 1;
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sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
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if (!sg_table)
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return -ENOMEM;
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rd_dev->sg_prot_array = sg_table;
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rd_dev->sg_prot_count = sg_tables;
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rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
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if (rc)
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return rc;
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pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot 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, total_sg_needed, rd_dev->sg_prot_count);
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return 0;
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}
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static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
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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(*rd_dev), GFP_KERNEL);
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if (!rd_dev)
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return NULL;
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rd_dev->rd_host = rd_host;
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return &rd_dev->dev;
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}
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static int rd_configure_device(struct se_device *dev)
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{
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struct rd_dev *rd_dev = RD_DEV(dev);
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struct rd_host *rd_host = dev->se_hba->hba_ptr;
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int ret;
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if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
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pr_debug("Missing rd_pages= parameter\n");
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return -EINVAL;
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}
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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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dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
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dev->dev_attrib.hw_max_sectors = UINT_MAX;
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dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
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dev->dev_attrib.is_nonrot = 1;
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rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
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pr_debug("CORE_RD[%u] - Added TCM MEMCPY 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_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 0;
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fail:
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rd_release_device_space(rd_dev);
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return ret;
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}
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static void rd_dev_call_rcu(struct rcu_head *p)
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{
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struct se_device *dev = container_of(p, struct se_device, rcu_head);
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struct rd_dev *rd_dev = RD_DEV(dev);
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kfree(rd_dev);
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}
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static void rd_free_device(struct se_device *dev)
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{
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call_rcu(&dev->rcu_head, rd_dev_call_rcu);
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}
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static void rd_destroy_device(struct se_device *dev)
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{
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struct rd_dev *rd_dev = RD_DEV(dev);
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rd_release_device_space(rd_dev);
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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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struct rd_dev_sg_table *sg_table;
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u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
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sizeof(struct scatterlist));
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i = page / sg_per_table;
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if (i < rd_dev->sg_table_count) {
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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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pr_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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static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
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{
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struct rd_dev_sg_table *sg_table;
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u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
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sizeof(struct scatterlist));
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i = page / sg_per_table;
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if (i < rd_dev->sg_prot_count) {
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sg_table = &rd_dev->sg_prot_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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pr_err("Unable to locate struct prot 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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static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct rd_dev *dev = RD_DEV(se_dev);
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struct rd_dev_sg_table *prot_table;
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struct scatterlist *prot_sg;
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u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
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u32 prot_offset, prot_page;
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u32 prot_npages __maybe_unused;
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u64 tmp;
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sense_reason_t rc = 0;
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tmp = cmd->t_task_lba * se_dev->prot_length;
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prot_offset = do_div(tmp, PAGE_SIZE);
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prot_page = tmp;
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prot_table = rd_get_prot_table(dev, prot_page);
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if (!prot_table)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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prot_sg = &prot_table->sg_table[prot_page -
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prot_table->page_start_offset];
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if (se_dev->dev_attrib.pi_prot_verify) {
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if (is_read)
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rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
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prot_sg, prot_offset);
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else
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rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
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cmd->t_prot_sg, 0);
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}
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if (!rc)
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sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
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return rc;
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}
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static sense_reason_t
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rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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enum dma_data_direction data_direction)
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{
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struct se_device *se_dev = cmd->se_dev;
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struct rd_dev *dev = RD_DEV(se_dev);
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struct rd_dev_sg_table *table;
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struct scatterlist *rd_sg;
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struct sg_mapping_iter m;
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u32 rd_offset;
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u32 rd_size;
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u32 rd_page;
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u32 src_len;
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u64 tmp;
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sense_reason_t rc;
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if (dev->rd_flags & RDF_NULLIO) {
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target_complete_cmd(cmd, SAM_STAT_GOOD);
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return 0;
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}
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tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
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rd_offset = do_div(tmp, PAGE_SIZE);
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rd_page = tmp;
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rd_size = cmd->data_length;
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table = rd_get_sg_table(dev, rd_page);
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if (!table)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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rd_sg = &table->sg_table[rd_page - table->page_start_offset];
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pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
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dev->rd_dev_id,
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data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
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cmd->t_task_lba, rd_size, rd_page, rd_offset);
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if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
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data_direction == DMA_TO_DEVICE) {
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rc = rd_do_prot_rw(cmd, false);
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if (rc)
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return rc;
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}
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src_len = PAGE_SIZE - rd_offset;
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sg_miter_start(&m, sgl, sgl_nents,
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data_direction == DMA_FROM_DEVICE ?
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SG_MITER_TO_SG : SG_MITER_FROM_SG);
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while (rd_size) {
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u32 len;
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void *rd_addr;
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sg_miter_next(&m);
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if (!(u32)m.length) {
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pr_debug("RD[%u]: invalid sgl %p len %zu\n",
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dev->rd_dev_id, m.addr, m.length);
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sg_miter_stop(&m);
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return TCM_INCORRECT_AMOUNT_OF_DATA;
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}
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len = min((u32)m.length, src_len);
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if (len > rd_size) {
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pr_debug("RD[%u]: size underrun page %d offset %d "
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"size %d\n", dev->rd_dev_id,
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rd_page, rd_offset, rd_size);
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len = rd_size;
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}
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m.consumed = len;
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|
|
|
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 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 count;
|
|
}
|
|
|
|
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,
|
|
.destroy_device = rd_destroy_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);
|
|
}
|