scsi: cxlflash: Support LUN provisioning
Adopt the SISLite AFU LUN provisioning capability to allow future CXL
Flash adapters the ability to better manage storage. Update the SISLite
header with the changes necessary to support LUN provision operations
and create a host ioctl interface for user LUN management software. Also
update the cxlflash documentation to describe this new host ioctl.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index be468ed1..1279293 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -3227,14 +3227,105 @@ static int cxlflash_chr_open(struct inode *inode, struct file *file)
static char *decode_hioctl(int cmd)
{
switch (cmd) {
- default:
- return "UNKNOWN";
+ case HT_CXLFLASH_LUN_PROVISION:
+ return __stringify_1(HT_CXLFLASH_LUN_PROVISION);
}
return "UNKNOWN";
}
/**
+ * cxlflash_lun_provision() - host LUN provisioning handler
+ * @cfg: Internal structure associated with the host.
+ * @arg: Kernel copy of userspace ioctl data structure.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_lun_provision(struct cxlflash_cfg *cfg,
+ struct ht_cxlflash_lun_provision *lunprov)
+{
+ struct afu *afu = cfg->afu;
+ struct device *dev = &cfg->dev->dev;
+ struct sisl_ioarcb rcb;
+ struct sisl_ioasa asa;
+ __be64 __iomem *fc_port_regs;
+ u16 port = lunprov->port;
+ u16 scmd = lunprov->hdr.subcmd;
+ u16 type;
+ u64 reg;
+ u64 size;
+ u64 lun_id;
+ int rc = 0;
+
+ if (!afu_is_lun_provision(afu)) {
+ rc = -ENOTSUPP;
+ goto out;
+ }
+
+ if (port >= cfg->num_fc_ports) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ switch (scmd) {
+ case HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN:
+ type = SISL_AFU_LUN_PROVISION_CREATE;
+ size = lunprov->size;
+ lun_id = 0;
+ break;
+ case HT_CXLFLASH_LUN_PROVISION_SUBCMD_DELETE_LUN:
+ type = SISL_AFU_LUN_PROVISION_DELETE;
+ size = 0;
+ lun_id = lunprov->lun_id;
+ break;
+ case HT_CXLFLASH_LUN_PROVISION_SUBCMD_QUERY_PORT:
+ fc_port_regs = get_fc_port_regs(cfg, port);
+
+ reg = readq_be(&fc_port_regs[FC_MAX_NUM_LUNS / 8]);
+ lunprov->max_num_luns = reg;
+ reg = readq_be(&fc_port_regs[FC_CUR_NUM_LUNS / 8]);
+ lunprov->cur_num_luns = reg;
+ reg = readq_be(&fc_port_regs[FC_MAX_CAP_PORT / 8]);
+ lunprov->max_cap_port = reg;
+ reg = readq_be(&fc_port_regs[FC_CUR_CAP_PORT / 8]);
+ lunprov->cur_cap_port = reg;
+
+ goto out;
+ default:
+ rc = -EINVAL;
+ goto out;
+ }
+
+ memset(&rcb, 0, sizeof(rcb));
+ memset(&asa, 0, sizeof(asa));
+ rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD;
+ rcb.lun_id = lun_id;
+ rcb.msi = SISL_MSI_RRQ_UPDATED;
+ rcb.timeout = MC_LUN_PROV_TIMEOUT;
+ rcb.ioasa = &asa;
+
+ rcb.cdb[0] = SISL_AFU_CMD_LUN_PROVISION;
+ rcb.cdb[1] = type;
+ rcb.cdb[2] = port;
+ put_unaligned_be64(size, &rcb.cdb[8]);
+
+ rc = send_afu_cmd(afu, &rcb);
+ if (rc) {
+ dev_err(dev, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n",
+ __func__, rc, asa.ioasc, asa.afu_extra);
+ goto out;
+ }
+
+ if (scmd == HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN) {
+ lunprov->lun_id = (u64)asa.lunid_hi << 32 | asa.lunid_lo;
+ memcpy(lunprov->wwid, asa.wwid, sizeof(lunprov->wwid));
+ }
+out:
+ dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc);
+ return rc;
+}
+
+/**
* cxlflash_chr_ioctl() - character device IOCTL handler
* @file: File pointer for this device.
* @cmd: IOCTL command.
@@ -3270,6 +3361,8 @@ static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd,
size_t size;
hioctl ioctl;
} ioctl_tbl[] = { /* NOTE: order matters here */
+ { sizeof(struct ht_cxlflash_lun_provision),
+ (hioctl)cxlflash_lun_provision },
};
/* Hold read semaphore so we can drain if needed */
@@ -3279,6 +3372,16 @@ static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd,
__func__, cmd, idx, sizeof(ioctl_tbl));
switch (cmd) {
+ case HT_CXLFLASH_LUN_PROVISION:
+ known_ioctl = true;
+ idx = _IOC_NR(HT_CXLFLASH_LUN_PROVISION) - _IOC_NR(cmd);
+ size = ioctl_tbl[idx].size;
+ do_ioctl = ioctl_tbl[idx].ioctl;
+
+ if (likely(do_ioctl))
+ break;
+
+ /* fall through */
default:
rc = -EINVAL;
goto out;