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684 lines
16 KiB
684 lines
16 KiB
// 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 <[email protected]> |
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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; |
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if (data_direction == DMA_FROM_DEVICE) |
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memcpy(m.addr, rd_addr, len); |
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else |
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memcpy(rd_addr, m.addr, len); |
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rd_size -= len; |
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if (!rd_size) |
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continue; |
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src_len -= len; |
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if (src_len) { |
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rd_offset += len; |
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continue; |
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} |
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/* rd page completed, next one please */ |
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rd_page++; |
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rd_offset = 0; |
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src_len = PAGE_SIZE; |
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if (rd_page <= table->page_end_offset) { |
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rd_sg++; |
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continue; |
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} |
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table = rd_get_sg_table(dev, rd_page); |
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if (!table) { |
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sg_miter_stop(&m); |
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
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} |
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/* since we increment, the first sg entry is correct */ |
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rd_sg = table->sg_table; |
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} |
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sg_miter_stop(&m); |
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if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
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data_direction == DMA_FROM_DEVICE) { |
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rc = rd_do_prot_rw(cmd, true); |
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if (rc) |
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return rc; |
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} |
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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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enum { |
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Opt_rd_pages, Opt_rd_nullio, Opt_rd_dummy, Opt_err |
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}; |
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|
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static match_table_t tokens = { |
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{Opt_rd_pages, "rd_pages=%d"}, |
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{Opt_rd_nullio, "rd_nullio=%d"}, |
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{Opt_rd_dummy, "rd_dummy=%d"}, |
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{Opt_err, NULL} |
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}; |
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|
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static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
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const char *page, ssize_t count) |
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{ |
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struct rd_dev *rd_dev = RD_DEV(dev); |
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char *orig, *ptr, *opts; |
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substring_t args[MAX_OPT_ARGS]; |
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int arg, token; |
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opts = kstrdup(page, GFP_KERNEL); |
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if (!opts) |
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return -ENOMEM; |
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orig = opts; |
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|
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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; |
|
case Opt_rd_dummy: |
|
match_int(args, &arg); |
|
if (arg != 1) |
|
break; |
|
|
|
pr_debug("RAMDISK: Setting DUMMY flag: %d\n", arg); |
|
rd_dev->rd_flags |= RDF_DUMMY; |
|
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 dummy: %d\n", |
|
rd_dev->rd_page_count, |
|
PAGE_SIZE, rd_dev->sg_table_count, |
|
!!(rd_dev->rd_flags & RDF_NULLIO), |
|
!!(rd_dev->rd_flags & RDF_DUMMY)); |
|
return bl; |
|
} |
|
|
|
static u32 rd_get_device_type(struct se_device *dev) |
|
{ |
|
if (RD_DEV(dev)->rd_flags & RDF_DUMMY) |
|
return 0x3f; /* Unknown device type, not connected */ |
|
else |
|
return sbc_get_device_type(dev); |
|
} |
|
|
|
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 = rd_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); |
|
}
|
|
|