For ZBC devices I/O must not cross zone boundaries, so setup
the 'chunk_sectors' block queue setting to the zone size.
This is only valid for REPORT ZONES SAME type 2 or 3;
for other types the zone sizes might be different
for individual zones. So issue a warning if the type is
found to be different.
Also the capacity might be different from the announced
capacity, so adjust it as needed.
Signed-off-by: Hannes Reinecke <hare@xxxxxxxx>
---
drivers/scsi/sd.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++---
drivers/scsi/sd.h | 2 +
2 files changed, 104 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 8401697..74637fd 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1972,6 +1972,45 @@ sd_spinup_disk(struct scsi_disk *sdkp)
}
}
+static int
+sd_zbc_report_zones(struct scsi_disk *sdkp, sector_t start_lba,
+ unsigned char *buffer, int bufflen )
+{
+ struct scsi_device *sdp = sdkp->device;
+ const int timeout = sdp->request_queue->rq_timeout
+ * SD_FLUSH_TIMEOUT_MULTIPLIER;
+ struct scsi_sense_hdr sshdr;
+ unsigned char cmd[16];
+ int result;
+
+ if (!scsi_device_online(sdp)) {
+ sd_printk(KERN_INFO, sdkp, "device not online\n");
+ return -ENODEV;
+ }
+
+ sd_printk(KERN_INFO, sdkp, "REPORT ZONES lba %zu len %d\n",
+ start_lba, bufflen);
+
+ memset(cmd, 0, 16);
+ cmd[0] = ZBC_IN;
+ cmd[1] = ZI_REPORT_ZONES;
+ put_unaligned_be64(start_lba, &cmd[2]);
+ put_unaligned_be32(bufflen, &cmd[10]);
+ memset(buffer, 0, bufflen);
+
+ result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
+ buffer, bufflen, &sshdr,
+ timeout, SD_MAX_RETRIES, NULL);
+
+ if (result) {
+ sd_printk(KERN_NOTICE, sdkp,
+ "REPORT ZONES lba %zu failed with %d/%d\n",
+ start_lba, host_byte(result), driver_byte(result));
+
+ return -EIO;
+ }
+ return 0;
+}
/*
* Determine whether disk supports Data Integrity Field.
@@ -2014,6 +2053,58 @@ static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer
return ret;
}
+static void sd_read_zones(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int retval;
+ unsigned char *desc;
+ u32 rep_len;
+ u8 same;
+ u64 zone_len, lba;
+
+ if (sdkp->zoned != 1)
+ /* Device managed, no special handling required */
+ return;
+
+ retval = sd_zbc_report_zones(sdkp, 0, buffer, SD_BUF_SIZE);
+ if (retval < 0)
+ return;
+
+ rep_len = get_unaligned_be32(&buffer[0]);
+ if (rep_len < 64) {
+ sd_printk(KERN_WARNING, sdkp,
+ "REPORT ZONES report invalid length %u\n",
+ rep_len);
+ return;
+ }
+
+ if (sdkp->rc_basis == 0) {
+ /* The max_lba field is the capacity of a zoned device */
+ lba = get_unaligned_be64(&buffer[8]);
+ if (lba + 1 > sdkp->capacity) {
+ sd_printk(KERN_WARNING, sdkp,
+ "Max LBA %zu (capacity %zu)\n",
+ (sector_t) lba + 1, sdkp->capacity);
+ sdkp->capacity = lba + 1;
+ }
+ }
+
+ /*
+ * Adjust 'chunk_sectors' to the zone length if the device
+ * supports equal zone sizes.
+ */
+ same = buffer[4] & 0xf;
+ if (same == 0 || same > 3) {
+ sd_printk(KERN_WARNING, sdkp,
+ "REPORT ZONES SAME type %d not supported\n", same);
+ return;
+ }
+ /* Read the zone length from the first zone descriptor */
+ desc = &buffer[64];
+ zone_len = logical_to_sectors(sdkp->device,
+ get_unaligned_be64(&desc[8]));
+ blk_queue_chunk_sectors(sdkp->disk->queue, zone_len);
+}
+
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
struct scsi_sense_hdr *sshdr, int sense_valid,
int the_result)
@@ -2122,6 +2213,9 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
/* Logical blocks per physical block exponent */
sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
+ /* RC basis */
+ sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
+
/* Lowest aligned logical block */
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
blk_queue_alignment_offset(sdp->request_queue, alignment);
@@ -2312,6 +2406,11 @@ got_data:
sector_size = 512;
}
blk_queue_logical_block_size(sdp->request_queue, sector_size);
+ blk_queue_physical_block_size(sdp->request_queue,
+ sdkp->physical_block_size);
+ sdkp->device->sector_size = sector_size;
+
+ sd_read_zones(sdkp, buffer);
{
char cap_str_2[10], cap_str_10[10];
@@ -2338,9 +2437,6 @@ got_data:
if (sdkp->capacity > 0xffffffff)
sdp->use_16_for_rw = 1;
- blk_queue_physical_block_size(sdp->request_queue,
- sdkp->physical_block_size);
- sdkp->device->sector_size = sector_size;
}
/* called with buffer of length 512 */
@@ -2727,6 +2823,7 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp)
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
}
+ sdkp->zoned = (buffer[8] >> 4) & 3;
out:
kfree(buffer);
}
@@ -2842,14 +2939,14 @@ static int sd_revalidate_disk(struct gendisk *disk)
* react badly if we do.
*/
if (sdkp->media_present) {
- sd_read_capacity(sdkp, buffer);
-
if (sd_try_extended_inquiry(sdp)) {
sd_read_block_provisioning(sdkp);
sd_read_block_limits(sdkp);
sd_read_block_characteristics(sdkp);
}
+ sd_read_capacity(sdkp, buffer);
+
sd_read_write_protect_flag(sdkp, buffer);
sd_read_cache_type(sdkp, buffer);
sd_read_app_tag_own(sdkp, buffer);
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 654630b..ab1696d 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -94,6 +94,8 @@ struct scsi_disk {
unsigned lbpvpd : 1;
unsigned ws10 : 1;
unsigned ws16 : 1;
+ unsigned rc_basis: 2;
+ unsigned zoned: 2;
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
--
1.8.5.6
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
