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[SCSI] sd: Identify DIF protection type and application tag ownership
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@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin K. Petersen
James Bottomley
parent
511e44f42e
commit
e0597d7001
@ -233,6 +233,24 @@ sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
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return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
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}
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static ssize_t
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sd_show_protection_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->protection_type);
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}
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static ssize_t
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sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct scsi_disk *sdkp = to_scsi_disk(dev);
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return snprintf(buf, 20, "%u\n", sdkp->ATO);
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}
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static struct device_attribute sd_disk_attrs[] = {
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__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
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sd_store_cache_type),
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@ -241,6 +259,8 @@ static struct device_attribute sd_disk_attrs[] = {
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sd_store_allow_restart),
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__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
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sd_store_manage_start_stop),
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__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
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__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
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__ATTR_NULL,
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};
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@ -1164,6 +1184,49 @@ sd_spinup_disk(struct scsi_disk *sdkp)
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}
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}
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/*
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* Determine whether disk supports Data Integrity Field.
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*/
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void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
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{
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struct scsi_device *sdp = sdkp->device;
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u8 type;
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if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
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type = 0;
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else
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type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
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switch (type) {
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case SD_DIF_TYPE0_PROTECTION:
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sdkp->protection_type = 0;
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break;
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case SD_DIF_TYPE1_PROTECTION:
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case SD_DIF_TYPE3_PROTECTION:
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sdkp->protection_type = type;
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break;
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case SD_DIF_TYPE2_PROTECTION:
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sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
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"protection which is currently unsupported. " \
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"Disabling disk!\n");
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goto disable;
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default:
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sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
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"protection type %d. Disabling disk!\n", type);
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goto disable;
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}
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return;
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disable:
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sdkp->protection_type = 0;
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sdkp->capacity = 0;
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}
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/*
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* read disk capacity
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*/
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@ -1173,7 +1236,8 @@ sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
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unsigned char cmd[16];
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int the_result, retries;
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int sector_size = 0;
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int longrc = 0;
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/* Force READ CAPACITY(16) when PROTECT=1 */
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int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
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struct scsi_sense_hdr sshdr;
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int sense_valid = 0;
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struct scsi_device *sdp = sdkp->device;
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@ -1185,8 +1249,8 @@ repeat:
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memset((void *) cmd, 0, 16);
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cmd[0] = SERVICE_ACTION_IN;
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cmd[1] = SAI_READ_CAPACITY_16;
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cmd[13] = 12;
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memset((void *) buffer, 0, 12);
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cmd[13] = 13;
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memset((void *) buffer, 0, 13);
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} else {
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cmd[0] = READ_CAPACITY;
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memset((void *) &cmd[1], 0, 9);
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@ -1194,7 +1258,7 @@ repeat:
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}
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the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
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buffer, longrc ? 12 : 8, &sshdr,
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buffer, longrc ? 13 : 8, &sshdr,
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SD_TIMEOUT, SD_MAX_RETRIES);
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if (media_not_present(sdkp, &sshdr))
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@ -1269,6 +1333,8 @@ repeat:
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sector_size = (buffer[8] << 24) |
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(buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
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sd_read_protection_type(sdkp, buffer);
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}
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/* Some devices return the total number of sectors, not the
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@ -1530,6 +1596,52 @@ defaults:
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sdkp->DPOFUA = 0;
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}
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/*
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* The ATO bit indicates whether the DIF application tag is available
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* for use by the operating system.
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*/
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void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
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{
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int res, offset;
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struct scsi_device *sdp = sdkp->device;
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struct scsi_mode_data data;
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struct scsi_sense_hdr sshdr;
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if (sdp->type != TYPE_DISK)
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return;
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if (sdkp->protection_type == 0)
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return;
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res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
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SD_MAX_RETRIES, &data, &sshdr);
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if (!scsi_status_is_good(res) || !data.header_length ||
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data.length < 6) {
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sd_printk(KERN_WARNING, sdkp,
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"getting Control mode page failed, assume no ATO\n");
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if (scsi_sense_valid(&sshdr))
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sd_print_sense_hdr(sdkp, &sshdr);
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return;
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}
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offset = data.header_length + data.block_descriptor_length;
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if ((buffer[offset] & 0x3f) != 0x0a) {
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sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
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return;
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}
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if ((buffer[offset + 5] & 0x80) == 0)
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return;
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sdkp->ATO = 1;
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return;
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}
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/**
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* sd_revalidate_disk - called the first time a new disk is seen,
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* performs disk spin up, read_capacity, etc.
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@ -1566,6 +1678,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
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sdkp->write_prot = 0;
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sdkp->WCE = 0;
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sdkp->RCD = 0;
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sdkp->ATO = 0;
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sd_spinup_disk(sdkp);
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@ -1577,6 +1690,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
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sd_read_capacity(sdkp, buffer);
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sd_read_write_protect_flag(sdkp, buffer);
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sd_read_cache_type(sdkp, buffer);
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sd_read_app_tag_own(sdkp, buffer);
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}
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/*
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@ -41,7 +41,9 @@ struct scsi_disk {
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u32 index;
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u8 media_present;
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u8 write_prot;
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u8 protection_type;/* Data Integrity Field */
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unsigned previous_state : 1;
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unsigned ATO : 1; /* state of disk ATO bit */
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unsigned WCE : 1; /* state of disk WCE bit */
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unsigned RCD : 1; /* state of disk RCD bit, unused */
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unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
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@ -59,4 +61,25 @@ static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
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(sdsk)->disk->disk_name, ##a) : \
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sdev_printk(prefix, (sdsk)->device, fmt, ##a)
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/*
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* A DIF-capable target device can be formatted with different
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* protection schemes. Currently 0 through 3 are defined:
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*
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* Type 0 is regular (unprotected) I/O
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*
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* Type 1 defines the contents of the guard and reference tags
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*
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* Type 2 defines the contents of the guard and reference tags and
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* uses 32-byte commands to seed the latter
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*
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* Type 3 defines the contents of the guard tag only
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*/
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enum sd_dif_target_protection_types {
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SD_DIF_TYPE0_PROTECTION = 0x0,
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SD_DIF_TYPE1_PROTECTION = 0x1,
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SD_DIF_TYPE2_PROTECTION = 0x2,
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SD_DIF_TYPE3_PROTECTION = 0x3,
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};
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#endif /* _SCSI_DISK_H */
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