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path: root/drivers/scsi/cxlflash/main.c
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Diffstat (limited to 'drivers/scsi/cxlflash/main.c')
-rw-r--r--drivers/scsi/cxlflash/main.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 1279293ff3b3..d3ad52ec5314 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -3326,6 +3326,99 @@ out:
}
/**
+ * cxlflash_afu_debug() - host AFU debug handler
+ * @cfg: Internal structure associated with the host.
+ * @arg: Kernel copy of userspace ioctl data structure.
+ *
+ * For debug requests requiring a data buffer, always provide an aligned
+ * (cache line) buffer to the AFU to appease any alignment requirements.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+static int cxlflash_afu_debug(struct cxlflash_cfg *cfg,
+ struct ht_cxlflash_afu_debug *afu_dbg)
+{
+ struct afu *afu = cfg->afu;
+ struct device *dev = &cfg->dev->dev;
+ struct sisl_ioarcb rcb;
+ struct sisl_ioasa asa;
+ char *buf = NULL;
+ char *kbuf = NULL;
+ void __user *ubuf = (__force void __user *)afu_dbg->data_ea;
+ u16 req_flags = SISL_REQ_FLAGS_AFU_CMD;
+ u32 ulen = afu_dbg->data_len;
+ bool is_write = afu_dbg->hdr.flags & HT_CXLFLASH_HOST_WRITE;
+ int rc = 0;
+
+ if (!afu_is_afu_debug(afu)) {
+ rc = -ENOTSUPP;
+ goto out;
+ }
+
+ if (ulen) {
+ req_flags |= SISL_REQ_FLAGS_SUP_UNDERRUN;
+
+ if (ulen > HT_CXLFLASH_AFU_DEBUG_MAX_DATA_LEN) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ if (unlikely(!access_ok(is_write ? VERIFY_READ : VERIFY_WRITE,
+ ubuf, ulen))) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ buf = kmalloc(ulen + cache_line_size() - 1, GFP_KERNEL);
+ if (unlikely(!buf)) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ kbuf = PTR_ALIGN(buf, cache_line_size());
+
+ if (is_write) {
+ req_flags |= SISL_REQ_FLAGS_HOST_WRITE;
+
+ rc = copy_from_user(kbuf, ubuf, ulen);
+ if (unlikely(rc))
+ goto out;
+ }
+ }
+
+ memset(&rcb, 0, sizeof(rcb));
+ memset(&asa, 0, sizeof(asa));
+
+ rcb.req_flags = req_flags;
+ rcb.msi = SISL_MSI_RRQ_UPDATED;
+ rcb.timeout = MC_AFU_DEBUG_TIMEOUT;
+ rcb.ioasa = &asa;
+
+ if (ulen) {
+ rcb.data_len = ulen;
+ rcb.data_ea = (uintptr_t)kbuf;
+ }
+
+ rcb.cdb[0] = SISL_AFU_CMD_DEBUG;
+ memcpy(&rcb.cdb[4], afu_dbg->afu_subcmd,
+ HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN);
+
+ 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 (ulen && !is_write)
+ rc = copy_to_user(ubuf, kbuf, ulen);
+out:
+ kfree(buf);
+ 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.
@@ -3363,6 +3456,8 @@ static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd,
} ioctl_tbl[] = { /* NOTE: order matters here */
{ sizeof(struct ht_cxlflash_lun_provision),
(hioctl)cxlflash_lun_provision },
+ { sizeof(struct ht_cxlflash_afu_debug),
+ (hioctl)cxlflash_afu_debug },
};
/* Hold read semaphore so we can drain if needed */
@@ -3373,6 +3468,7 @@ static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd,
switch (cmd) {
case HT_CXLFLASH_LUN_PROVISION:
+ case HT_CXLFLASH_AFU_DEBUG:
known_ioctl = true;
idx = _IOC_NR(HT_CXLFLASH_LUN_PROVISION) - _IOC_NR(cmd);
size = ioctl_tbl[idx].size;