提交 4e7392ec 编写于 作者: M Martin K. Petersen 提交者: James Bottomley

[SCSI] sd: Support disks formatted with DIF Type 2

Disks formatted with DIF Type 2 reject READ/WRITE 6/10/12/16 commands
when protection is enabled.  Only the 32-byte variants are supported.

Implement support for issusing 32-byte READ/WRITE and enable Type 2
drives in the protection type detection logic.
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
上级 b4c2554d
......@@ -116,6 +116,9 @@ static DEFINE_IDA(sd_index_ida);
* object after last put) */
static DEFINE_MUTEX(sd_ref_mutex);
struct kmem_cache *sd_cdb_cache;
mempool_t *sd_cdb_pool;
static const char *sd_cache_types[] = {
"write through", "none", "write back",
"write back, no read (daft)"
......@@ -413,6 +416,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
sector_t threshold;
unsigned int this_count = blk_rq_sectors(rq);
int ret, host_dif;
unsigned char protect;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
......@@ -545,13 +549,49 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
if (host_dif)
SCpnt->cmnd[1] = 1 << 5;
protect = 1 << 5;
else
SCpnt->cmnd[1] = 0;
protect = 0;
if (host_dif == SD_DIF_TYPE2_PROTECTION) {
SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
if (unlikely(SCpnt->cmnd == NULL)) {
ret = BLKPREP_DEFER;
goto out;
}
if (block > 0xffffffff) {
SCpnt->cmd_len = SD_EXT_CDB_SIZE;
memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
SCpnt->cmnd[7] = 0x18;
SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
/* LBA */
SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
SCpnt->cmnd[19] = (unsigned char) block & 0xff;
/* Expected Indirect LBA */
SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
SCpnt->cmnd[23] = (unsigned char) block & 0xff;
/* Transfer length */
SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
} else if (block > 0xffffffff) {
SCpnt->cmnd[0] += READ_16 - READ_6;
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
......@@ -572,7 +612,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
this_count = 0xffff;
SCpnt->cmnd[0] += READ_10 - READ_6;
SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
......@@ -1047,6 +1087,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
int result = SCpnt->result;
unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
struct scsi_sense_hdr sshdr;
struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
int sense_valid = 0;
int sense_deferred = 0;
......@@ -1108,6 +1149,10 @@ static int sd_done(struct scsi_cmnd *SCpnt)
if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
sd_dif_complete(SCpnt, good_bytes);
if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
== SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd)
mempool_free(SCpnt->cmnd, sd_cdb_pool);
return good_bytes;
}
......@@ -1271,12 +1316,7 @@ void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
sdkp->protection_type = type;
switch (type) {
case SD_DIF_TYPE1_PROTECTION:
case SD_DIF_TYPE3_PROTECTION:
break;
default:
if (type > SD_DIF_TYPE3_PROTECTION) {
sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
"protection type %u. Disabling disk!\n", type);
sdkp->capacity = 0;
......@@ -2323,8 +2363,24 @@ static int __init init_sd(void)
if (err)
goto err_out_class;
sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
0, 0, NULL);
if (!sd_cdb_cache) {
printk(KERN_ERR "sd: can't init extended cdb cache\n");
goto err_out_class;
}
sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
if (!sd_cdb_pool) {
printk(KERN_ERR "sd: can't init extended cdb pool\n");
goto err_out_cache;
}
return 0;
err_out_cache:
kmem_cache_destroy(sd_cdb_cache);
err_out_class:
class_unregister(&sd_disk_class);
err_out:
......@@ -2344,6 +2400,9 @@ static void __exit exit_sd(void)
SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
mempool_destroy(sd_cdb_pool);
kmem_cache_destroy(sd_cdb_cache);
scsi_unregister_driver(&sd_template.gendrv);
class_unregister(&sd_disk_class);
......
......@@ -37,6 +37,11 @@
*/
#define SD_LAST_BUGGY_SECTORS 8
enum {
SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
SD_MEMPOOL_SIZE = 2, /* CDB pool size */
};
struct scsi_disk {
struct scsi_driver *driver; /* always &sd_template */
struct scsi_device *device;
......
......@@ -129,6 +129,9 @@ struct scsi_cmnd;
#define MI_REPORT_TARGET_PGS 0x0a
/* values for maintenance out */
#define MO_SET_TARGET_PGS 0x0a
/* values for variable length command */
#define READ_32 0x09
#define WRITE_32 0x0b
/* Values for T10/04-262r7 */
#define ATA_16 0x85 /* 16-byte pass-thru */
......
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