cxlflash: Virtual LUN support
Add support for physical LUN segmentation (virtual LUNs) to device
driver supporting the IBM CXL Flash adapter. This patch allows user
space applications to virtually segment a physical LUN into N virtual
LUNs, taking advantage of the translation features provided by this
adapter.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
diff --git a/include/uapi/scsi/cxlflash_ioctl.h b/include/uapi/scsi/cxlflash_ioctl.h
index 5707734..831351b 100644
--- a/include/uapi/scsi/cxlflash_ioctl.h
+++ b/include/uapi/scsi/cxlflash_ioctl.h
@@ -71,6 +71,17 @@
__u64 reserved[8]; /* Reserved for future use */
};
+#define DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME 0x8000000000000000ULL
+
+struct dk_cxlflash_uvirtual {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context to own virtual resources */
+ __u64 lun_size; /* Requested size, in 4K blocks */
+ __u64 rsrc_handle; /* Returned resource handle */
+ __u64 last_lba; /* Returned last LBA of LUN */
+ __u64 reserved[8]; /* Reserved for future use */
+};
+
struct dk_cxlflash_release {
struct dk_cxlflash_hdr hdr; /* Common fields */
__u64 context_id; /* Context owning resources */
@@ -78,6 +89,23 @@
__u64 reserved[8]; /* Reserved for future use */
};
+struct dk_cxlflash_resize {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id; /* Context owning resources */
+ __u64 rsrc_handle; /* Resource handle of LUN to resize */
+ __u64 req_size; /* New requested size, in 4K blocks */
+ __u64 last_lba; /* Returned last LBA of LUN */
+ __u64 reserved[8]; /* Reserved for future use */
+};
+
+struct dk_cxlflash_clone {
+ struct dk_cxlflash_hdr hdr; /* Common fields */
+ __u64 context_id_src; /* Context to clone from */
+ __u64 context_id_dst; /* Context to clone to */
+ __u64 adap_fd_src; /* Source context adapter fd */
+ __u64 reserved[8]; /* Reserved for future use */
+};
+
#define DK_CXLFLASH_VERIFY_SENSE_LEN 18
#define DK_CXLFLASH_VERIFY_HINT_SENSE 0x8000000000000000ULL
@@ -118,7 +146,10 @@
struct dk_cxlflash_attach attach;
struct dk_cxlflash_detach detach;
struct dk_cxlflash_udirect udirect;
+ struct dk_cxlflash_uvirtual uvirtual;
struct dk_cxlflash_release release;
+ struct dk_cxlflash_resize resize;
+ struct dk_cxlflash_clone clone;
struct dk_cxlflash_verify verify;
struct dk_cxlflash_recover_afu recover_afu;
struct dk_cxlflash_manage_lun manage_lun;
@@ -136,5 +167,8 @@
#define DK_CXLFLASH_VERIFY CXL_IOWR(0x84, dk_cxlflash_verify)
#define DK_CXLFLASH_RECOVER_AFU CXL_IOWR(0x85, dk_cxlflash_recover_afu)
#define DK_CXLFLASH_MANAGE_LUN CXL_IOWR(0x86, dk_cxlflash_manage_lun)
+#define DK_CXLFLASH_USER_VIRTUAL CXL_IOWR(0x87, dk_cxlflash_uvirtual)
+#define DK_CXLFLASH_VLUN_RESIZE CXL_IOWR(0x88, dk_cxlflash_resize)
+#define DK_CXLFLASH_VLUN_CLONE CXL_IOWR(0x89, dk_cxlflash_clone)
#endif /* ifndef _CXLFLASH_IOCTL_H */