These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / include / scsi / scsi_common.h

diff --git a/kernel/include/scsi/scsi_common.h b/kernel/include/scsi/scsi_common.h
new file mode 100644 (file)
index 0000000..11571b2
--- /dev/null
+++ b/kernel/include/scsi/scsi_common.h
@@ -0,0 +1,69 @@
+/*
+ * Functions used by both the SCSI initiator code and the SCSI target code.
+ */
+
+#ifndef _SCSI_COMMON_H_
+#define _SCSI_COMMON_H_
+
+#include <linux/types.h>
+#include <scsi/scsi_proto.h>
+
+static inline unsigned
+scsi_varlen_cdb_length(const void *hdr)
+{
+       return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
+}
+
+extern const unsigned char scsi_command_size_tbl[8];
+#define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
+
+static inline unsigned
+scsi_command_size(const unsigned char *cmnd)
+{
+       return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
+               scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
+}
+
+/* Returns a human-readable name for the device */
+extern const char *scsi_device_type(unsigned type);
+
+extern void int_to_scsilun(u64, struct scsi_lun *);
+extern u64 scsilun_to_int(struct scsi_lun *);
+
+/*
+ * This is a slightly modified SCSI sense "descriptor" format header.
+ * The addition is to allow the 0x70 and 0x71 response codes. The idea
+ * is to place the salient data from either "fixed" or "descriptor" sense
+ * format into one structure to ease application processing.
+ *
+ * The original sense buffer should be kept around for those cases
+ * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
+ */
+struct scsi_sense_hdr {                /* See SPC-3 section 4.5 */
+       u8 response_code;       /* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
+       u8 sense_key;
+       u8 asc;
+       u8 ascq;
+       u8 byte4;
+       u8 byte5;
+       u8 byte6;
+       u8 additional_length;   /* always 0 for fixed sense format */
+};
+
+static inline bool scsi_sense_valid(const struct scsi_sense_hdr *sshdr)
+{
+       if (!sshdr)
+               return false;
+
+       return (sshdr->response_code & 0x70) == 0x70;
+}
+
+extern bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
+                                struct scsi_sense_hdr *sshdr);
+
+extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);
+int scsi_set_sense_information(u8 *buf, int buf_len, u64 info);
+extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
+                                      int desc_type);
+
+#endif /* _SCSI_COMMON_H_ */