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-rw-r--r--drivers/scsi/sd.c107
-rw-r--r--drivers/scsi/sd.h2
2 files changed, 109 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 9093c7261f33..255da53e5a01 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -264,6 +264,15 @@ sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
264 return snprintf(buf, 20, "%u\n", sdkp->ATO); 264 return snprintf(buf, 20, "%u\n", sdkp->ATO);
265} 265}
266 266
267static ssize_t
268sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
269 char *buf)
270{
271 struct scsi_disk *sdkp = to_scsi_disk(dev);
272
273 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
274}
275
267static struct device_attribute sd_disk_attrs[] = { 276static struct device_attribute sd_disk_attrs[] = {
268 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, 277 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
269 sd_store_cache_type), 278 sd_store_cache_type),
@@ -274,6 +283,7 @@ static struct device_attribute sd_disk_attrs[] = {
274 sd_store_manage_start_stop), 283 sd_store_manage_start_stop),
275 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), 284 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
276 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), 285 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
286 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
277 __ATTR_NULL, 287 __ATTR_NULL,
278}; 288};
279 289
@@ -399,6 +409,57 @@ static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
399} 409}
400 410
401/** 411/**
412 * sd_prepare_discard - unmap blocks on thinly provisioned device
413 * @rq: Request to prepare
414 *
415 * Will issue either UNMAP or WRITE SAME(16) depending on preference
416 * indicated by target device.
417 **/
418static int sd_prepare_discard(struct request *rq)
419{
420 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
421 struct bio *bio = rq->bio;
422 sector_t sector = bio->bi_sector;
423 unsigned int num = bio_sectors(bio);
424
425 if (sdkp->device->sector_size == 4096) {
426 sector >>= 3;
427 num >>= 3;
428 }
429
430 rq->cmd_type = REQ_TYPE_BLOCK_PC;
431 rq->timeout = SD_TIMEOUT;
432
433 memset(rq->cmd, 0, rq->cmd_len);
434
435 if (sdkp->unmap) {
436 char *buf = kmap_atomic(bio_page(bio), KM_USER0);
437
438 rq->cmd[0] = UNMAP;
439 rq->cmd[8] = 24;
440 rq->cmd_len = 10;
441
442 /* Ensure that data length matches payload */
443 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24;
444
445 put_unaligned_be16(6 + 16, &buf[0]);
446 put_unaligned_be16(16, &buf[2]);
447 put_unaligned_be64(sector, &buf[8]);
448 put_unaligned_be32(num, &buf[16]);
449
450 kunmap_atomic(buf, KM_USER0);
451 } else {
452 rq->cmd[0] = WRITE_SAME_16;
453 rq->cmd[1] = 0x8; /* UNMAP */
454 put_unaligned_be64(sector, &rq->cmd[2]);
455 put_unaligned_be32(num, &rq->cmd[10]);
456 rq->cmd_len = 16;
457 }
458
459 return BLKPREP_OK;
460}
461
462/**
402 * sd_init_command - build a scsi (read or write) command from 463 * sd_init_command - build a scsi (read or write) command from
403 * information in the request structure. 464 * information in the request structure.
404 * @SCpnt: pointer to mid-level's per scsi command structure that 465 * @SCpnt: pointer to mid-level's per scsi command structure that
@@ -418,6 +479,13 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
418 int ret, host_dif; 479 int ret, host_dif;
419 unsigned char protect; 480 unsigned char protect;
420 481
482 /*
483 * Discard request come in as REQ_TYPE_FS but we turn them into
484 * block PC requests to make life easier.
485 */
486 if (blk_discard_rq(rq))
487 ret = sd_prepare_discard(rq);
488
421 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { 489 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
422 ret = scsi_setup_blk_pc_cmnd(sdp, rq); 490 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
423 goto out; 491 goto out;
@@ -1432,6 +1500,19 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1432 sd_printk(KERN_NOTICE, sdkp, 1500 sd_printk(KERN_NOTICE, sdkp,
1433 "physical block alignment offset: %u\n", alignment); 1501 "physical block alignment offset: %u\n", alignment);
1434 1502
1503 if (buffer[14] & 0x80) { /* TPE */
1504 struct request_queue *q = sdp->request_queue;
1505
1506 sdkp->thin_provisioning = 1;
1507 q->limits.discard_granularity = sdkp->hw_sector_size;
1508 q->limits.max_discard_sectors = 0xffffffff;
1509
1510 if (buffer[14] & 0x40) /* TPRZ */
1511 q->limits.discard_zeroes_data = 1;
1512
1513 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1514 }
1515
1435 sdkp->capacity = lba + 1; 1516 sdkp->capacity = lba + 1;
1436 return sector_size; 1517 return sector_size;
1437} 1518}
@@ -1863,6 +1944,7 @@ void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1863 */ 1944 */
1864static void sd_read_block_limits(struct scsi_disk *sdkp) 1945static void sd_read_block_limits(struct scsi_disk *sdkp)
1865{ 1946{
1947 struct request_queue *q = sdkp->disk->queue;
1866 unsigned int sector_sz = sdkp->device->sector_size; 1948 unsigned int sector_sz = sdkp->device->sector_size;
1867 char *buffer; 1949 char *buffer;
1868 1950
@@ -1877,6 +1959,31 @@ static void sd_read_block_limits(struct scsi_disk *sdkp)
1877 blk_queue_io_opt(sdkp->disk->queue, 1959 blk_queue_io_opt(sdkp->disk->queue,
1878 get_unaligned_be32(&buffer[12]) * sector_sz); 1960 get_unaligned_be32(&buffer[12]) * sector_sz);
1879 1961
1962 /* Thin provisioning enabled and page length indicates TP support */
1963 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
1964 unsigned int lba_count, desc_count, granularity;
1965
1966 lba_count = get_unaligned_be32(&buffer[20]);
1967 desc_count = get_unaligned_be32(&buffer[24]);
1968
1969 if (lba_count) {
1970 q->limits.max_discard_sectors =
1971 lba_count * sector_sz >> 9;
1972
1973 if (desc_count)
1974 sdkp->unmap = 1;
1975 }
1976
1977 granularity = get_unaligned_be32(&buffer[28]);
1978
1979 if (granularity)
1980 q->limits.discard_granularity = granularity * sector_sz;
1981
1982 if (buffer[32] & 0x80)
1983 q->limits.discard_alignment =
1984 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
1985 }
1986
1880 kfree(buffer); 1987 kfree(buffer);
1881} 1988}
1882 1989
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index e374804d26fb..43d3caf268ef 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -60,6 +60,8 @@ struct scsi_disk {
60 unsigned RCD : 1; /* state of disk RCD bit, unused */ 60 unsigned RCD : 1; /* state of disk RCD bit, unused */
61 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */ 61 unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
62 unsigned first_scan : 1; 62 unsigned first_scan : 1;
63 unsigned thin_provisioning : 1;
64 unsigned unmap : 1;
63}; 65};
64#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev) 66#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
65 67