If a disk is formatted with protection information (Inquiry bit
PROTECT=1) it is required to support Read Capacity(16). Force use of
the 16-bit command in this case and extract the P_TYPE field which
indicates whether the disk is formatted using DIF Type 1, 2 or 3.
The ATO (App Tag Own) bit in the Control Mode Page indicates whether
the storage device or the initiator own the contents of the
DIF application tag.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
2 files changed, 141 insertions(+), 4 deletions(-)
drivers/scsi/sd.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++--
drivers/scsi/sd.h | 23 +++++++++
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -234,6 +234,24 @@ sd_show_allow_restart(struct device *dev
return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
}
+static ssize_t
+sd_show_protection_type(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->protection_type);
+}
+
+static ssize_t
+sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->ATO);
+}
+
static struct device_attribute sd_disk_attrs[] = {
__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
sd_store_cache_type),
@@ -242,6 +260,8 @@ static struct device_attribute sd_disk_a
sd_store_allow_restart),
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
sd_store_manage_start_stop),
+ __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
+ __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
__ATTR_NULL,
};
@@ -1163,6 +1183,49 @@ sd_spinup_disk(struct scsi_disk *sdkp)
}
}
+
+/*
+ * Determine whether disk supports Data Integrity Field.
+ */
+void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ struct scsi_device *sdp = sdkp->device;
+ u8 type;
+
+ if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
+ type = 0;
+ else
+ type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
+
+ switch (type) {
+ case SD_DIF_TYPE0_PROTECTION:
+ sdkp->protection_type = 0;
+ break;
+
+ case SD_DIF_TYPE1_PROTECTION:
+ case SD_DIF_TYPE3_PROTECTION:
+ sdkp->protection_type = type;
+ break;
+
+ case SD_DIF_TYPE2_PROTECTION:
+ sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
+ "protection which is currently unsupported. " \
+ "Disabling disk!\n");
+ goto disable;
+
+ default:
+ sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
+ "protection type %d. Disabling disk!\n", type);
+ goto disable;
+ }
+
+ return;
+
+disable:
+ sdkp->protection_type = 0;
+ sdkp->capacity = 0;
+}
+
/*
* read disk capacity
*/
@@ -1172,7 +1235,8 @@ sd_read_capacity(struct scsi_disk *sdkp,
unsigned char cmd[16];
int the_result, retries;
int sector_size = 0;
- int longrc = 0;
+ /* Force READ CAPACITY(16) when PROTECT=1 */
+ int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
struct scsi_sense_hdr sshdr;
int sense_valid = 0;
struct scsi_device *sdp = sdkp->device;
@@ -1184,8 +1248,8 @@ repeat:
memset((void *) cmd, 0, 16);
cmd[0] = SERVICE_ACTION_IN;
cmd[1] = SAI_READ_CAPACITY_16;
- cmd[13] = 12;
- memset((void *) buffer, 0, 12);
+ cmd[13] = 13;
+ memset((void *) buffer, 0, 13);
} else {
cmd[0] = READ_CAPACITY;
memset((void *) &cmd[1], 0, 9);
@@ -1193,7 +1257,7 @@ repeat:
}
the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
- buffer, longrc ? 12 : 8, &sshdr,
+ buffer, longrc ? 13 : 8, &sshdr,
SD_TIMEOUT, SD_MAX_RETRIES);
if (media_not_present(sdkp, &sshdr))
@@ -1268,6 +1332,8 @@ repeat:
sector_size = (buffer[8] << 24) |
(buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
+
+ sd_read_protection_type(sdkp, buffer);
}
/* Some devices return the total number of sectors, not the
@@ -1529,6 +1595,52 @@ defaults:
sdkp->DPOFUA = 0;
}
+/*
+ * The ATO bit indicates whether the DIF application tag is available
+ * for use by the operating system.
+ */
+void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
+{
+ int res, offset;
+ struct scsi_device *sdp = sdkp->device;
+ struct scsi_mode_data data;
+ struct scsi_sense_hdr sshdr;
+
+ if (sdp->type != TYPE_DISK)
+ return;
+
+ if (sdkp->protection_type == 0)
+ return;
+
+ res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, &sshdr);
+
+ if (!scsi_status_is_good(res) || !data.header_length ||
+ data.length < 6) {
+ sd_printk(KERN_WARNING, sdkp,
+ "getting Control mode page failed, assume no ATO\n");
+
+ if (scsi_sense_valid(&sshdr))
+ sd_print_sense_hdr(sdkp, &sshdr);
+
+ return;
+ }
+
+ offset = data.header_length + data.block_descriptor_length;
+
+ if ((buffer[offset] & 0x3f) != 0x0a) {
+ sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
+ return;
+ }
+
+ if ((buffer[offset + 5] & 0x80) == 0)
+ return;
+
+ sdkp->ATO = 1;
+
+ return;
+}
+
/**
* sd_revalidate_disk - called the first time a new disk is seen,
* performs disk spin up, read_capacity, etc.
@@ -1565,6 +1677,7 @@ static int sd_revalidate_disk(struct gen
sdkp->write_prot = 0;
sdkp->WCE = 0;
sdkp->RCD = 0;
+ sdkp->ATO = 0;
sd_spinup_disk(sdkp);
@@ -1576,6 +1689,7 @@ static int sd_revalidate_disk(struct gen
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
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -41,7 +41,9 @@ struct scsi_disk {
u32 index;
u8 media_present;
u8 write_prot;
+ u8 protection_type;/* Data Integrity Field */
unsigned previous_state : 1;
+ unsigned ATO : 1; /* state of disk ATO bit */
unsigned WCE : 1; /* state of disk WCE bit */
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
@@ -59,4 +61,25 @@ static inline struct scsi_disk *scsi_dis
(sdsk)->disk->disk_name, ##a) : \
sdev_printk(prefix, (sdsk)->device, fmt, ##a)
+/*
+ * A DIF-capable target device can be formatted with different
+ * protection schemes. Currently 0 through 3 are defined:
+ *
+ * Type 0 is regular (unprotected) I/O
+ *
+ * Type 1 defines the contents of the guard and reference tags
+ *
+ * Type 2 defines the contents of the guard and reference tags and
+ * uses 32-byte commands to seed the latter
+ *
+ * Type 3 defines the contents of the guard tag only
+ */
+
+enum sd_dif_target_protection_types {
+ SD_DIF_TYPE0_PROTECTION = 0x0,
+ SD_DIF_TYPE1_PROTECTION = 0x1,
+ SD_DIF_TYPE2_PROTECTION = 0x2,
+ SD_DIF_TYPE3_PROTECTION = 0x3,
+};
+
#endif /* _SCSI_DISK_H */
--
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