libata: support host-aware and host-managed ZAC devices

Byte 69 bits 0:1 in the IDENTIFY DEVICE data indicate a
host-aware ZAC device.
Host-managed ZAC devices have their own individual signature,
and to not set the bits in the IDENTIFY DEVICE data.
And whenever we detect a ZAC-compatible device we should
be displaying the zoned block characteristics VPD page.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Tejun Heo <tj@kernel.org>

4 files changed, 138 insertions, 2 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 1528c7cc0089..97f31707b570 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2227,6 +2227,99 @@ static void ata_dev_config_sense_reporting(struct ata_device *dev)
         }
 }
 
+static void ata_dev_config_zac(struct ata_device *dev)
+{
+        struct ata_port *ap = dev->link->ap;
+        unsigned int err_mask;
+        u8 *identify_buf = ap->sector_buf;
+        int log_index = ATA_LOG_SATA_ID_DEV_DATA * 2, i, found = 0;
+        u16 log_pages;
+
+        dev->zac_zones_optimal_open = U32_MAX;
+        dev->zac_zones_optimal_nonseq = U32_MAX;
+        dev->zac_zones_max_open = U32_MAX;
+
+        /*
+         * Always set the 'ZAC' flag for Host-managed devices.
+         */
+        if (dev->class == ATA_DEV_ZAC)
+                dev->flags |= ATA_DFLAG_ZAC;
+        else if (ata_id_zoned_cap(dev->id) == 0x01)
+                /*
+                 * Check for host-aware devices.
+                 */
+                dev->flags |= ATA_DFLAG_ZAC;
+
+        if (!(dev->flags & ATA_DFLAG_ZAC))
+                return;
+
+        /*
+         * Read Log Directory to figure out if IDENTIFY DEVICE log
+         * is supported.
+         */
+        err_mask = ata_read_log_page(dev, ATA_LOG_DIRECTORY,
+                                     0, ap->sector_buf, 1);
+        if (err_mask) {
+                ata_dev_info(dev,
+                             "failed to get Log Directory Emask 0x%x\n",
+                             err_mask);
+                return;
+        }
+        log_pages = get_unaligned_le16(&ap->sector_buf[log_index]);
+        if (log_pages == 0) {
+                ata_dev_warn(dev,
+                             "ATA Identify Device Log not supported\n");
+                return;
+        }
+        /*
+         * Read IDENTIFY DEVICE data log, page 0, to figure out
+         * if page 9 is supported.
+         */
+        err_mask = ata_read_log_page(dev, ATA_LOG_SATA_ID_DEV_DATA, 0,
+                                     identify_buf, 1);
+        if (err_mask) {
+                ata_dev_info(dev,
+                             "failed to get Device Identify Log Emask 0x%x\n",
+                             err_mask);
+                return;
+        }
+        log_pages = identify_buf[8];
+        for (i = 0; i < log_pages; i++) {
+                if (identify_buf[9 + i] == ATA_LOG_ZONED_INFORMATION) {
+                        found++;
+                        break;
+                }
+        }
+        if (!found) {
+                ata_dev_warn(dev,
+                             "ATA Zoned Information Log not supported\n");
+                return;
+        }
+
+        /*
+         * Read IDENTIFY DEVICE data log, page 9 (Zoned-device information)
+         */
+        err_mask = ata_read_log_page(dev, ATA_LOG_SATA_ID_DEV_DATA,
+                                     ATA_LOG_ZONED_INFORMATION,
+                                     identify_buf, 1);
+        if (!err_mask) {
+                u64 zoned_cap, opt_open, opt_nonseq, max_open;
+
+                zoned_cap = get_unaligned_le64(&identify_buf[8]);
+                if ((zoned_cap >> 63))
+                        dev->zac_zoned_cap = (zoned_cap & 1);
+                opt_open = get_unaligned_le64(&identify_buf[24]);
+                if ((opt_open >> 63))
+                        dev->zac_zones_optimal_open = (u32)opt_open;
+                opt_nonseq = get_unaligned_le64(&identify_buf[32]);
+                if ((opt_nonseq >> 63))
+                        dev->zac_zones_optimal_nonseq = (u32)opt_nonseq;
+                max_open = get_unaligned_le64(&identify_buf[40]);
+                if ((max_open >> 63))
+                        dev->zac_zones_max_open = (u32)max_open;
+        }
+}
+
 /**
  *      ata_dev_configure - Configure the specified ATA/ATAPI device
  *      @dev: Target device to configure
@@ -2450,6 +2543,7 @@ int ata_dev_configure(struct ata_device *dev)
                                 }
                 }
                 ata_dev_config_sense_reporting(dev);
+                ata_dev_config_zac(dev);
                 dev->cdb_len = 16;
         }
 
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 96abd42c9985..b86af1416dce 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2144,6 +2144,7 @@ static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
  */
 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
 {
+        int num_pages;
         const u8 pages[] = {
                 0x00,   /* page 0x00, this page */
                 0x80,   /* page 0x80, unit serial no page */
@@ -2152,10 +2153,14 @@ static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
                 0xb0,   /* page 0xb0, block limits page */
                 0xb1,   /* page 0xb1, block device characteristics page */
                 0xb2,   /* page 0xb2, thin provisioning page */
+                0xb6,   /* page 0xb6, zoned block device characteristics */
         };
 
-        rbuf[3] = sizeof(pages);        /* number of supported VPD pages */
-        memcpy(rbuf + 4, pages, sizeof(pages));
+        num_pages = sizeof(pages);
+        if (!(args->dev->flags & ATA_DFLAG_ZAC))
+                num_pages--;
+        rbuf[3] = num_pages;    /* number of supported VPD pages */
+        memcpy(rbuf + 4, pages, num_pages);
         return 0;
 }
 
@@ -2343,6 +2348,26 @@ static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
         return 0;
 }
 
+static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf)
+{
+        /*
+         * zbc-r05 SCSI Zoned Block device characteristics VPD page
+         */
+        rbuf[1] = 0xb6;
+        rbuf[3] = 0x3C;
+
+        /*
+         * URSWRZ bit is only meaningful for host-managed ZAC drives
+         */
+        if (args->dev->zac_zoned_cap & 1)
+                rbuf[4] |= 1;
+        put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]);
+        put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]);
+        put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]);
+
+        return 0;
+}
+
 /**
  *      ata_scsiop_noop - Command handler that simply returns success.
  *      @args: device IDENTIFY data / SCSI command of interest.
@@ -2661,6 +2686,9 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
                                 rbuf[14] |= 0x40; /* LBPRZ */
                         }
                 }
+                if (ata_id_zoned_cap(args->id) ||
+                    args->dev->class == ATA_DEV_ZAC)
+                        rbuf[12] = (1 << 4); /* RC_BASIS */
         }
         return 0;
 }
@@ -4046,6 +4074,12 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
                 case 0xb2:
                         ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
                         break;
+                case 0xb6:
+                        if (dev->flags & ATA_DFLAG_ZAC) {
+                                ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6);
+                                break;
+                        }
+                        /* Fallthrough */
                 default:
                         ata_scsi_invalid_field(dev, cmd, 2);
                         break;
diff --git a/include/linux/ata.h b/include/linux/ata.h
index ac1cb9310dea..83e2a99866c2 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -338,6 +338,7 @@ enum {
         ATA_LOG_NCQ_SEND_RECV     = 0x13,
         ATA_LOG_SATA_ID_DEV_DATA  = 0x30,
         ATA_LOG_SATA_SETTINGS     = 0x08,
+        ATA_LOG_ZONED_INFORMATION = 0x09,
         ATA_LOG_DEVSLP_OFFSET     = 0x30,
         ATA_LOG_DEVSLP_SIZE       = 0x08,
         ATA_LOG_DEVSLP_MDAT       = 0x00,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0019d4b51b11..d15c19e331d1 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -181,6 +181,7 @@ enum {
         ATA_DFLAG_DEVSLP        = (1 << 27), /* device supports Device Sleep */
         ATA_DFLAG_ACPI_DISABLED = (1 << 28), /* ACPI for the device is disabled */
         ATA_DFLAG_D_SENSE       = (1 << 29), /* Descriptor sense requested */
+        ATA_DFLAG_ZAC           = (1 << 30), /* ZAC device */
 
         ATA_DEV_UNKNOWN         = 0,    /* unknown device */
         ATA_DEV_ATA             = 1,    /* ATA device */
@@ -731,6 +732,12 @@ struct ata_device {
         u8                      ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_SIZE];
         u8                      ncq_non_data_cmds[ATA_LOG_NCQ_NON_DATA_SIZE];
 
+        /* ZAC zone configuration */
+        u32                     zac_zoned_cap;
+        u32                     zac_zones_optimal_open;
+        u32                     zac_zones_optimal_nonseq;
+        u32                     zac_zones_max_open;
+
         /* error history */
         int                     spdn_cnt;
         /* ering is CLEAR_END, read comment above CLEAR_END */