cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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scsi_dh.h (2601B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Header file for SCSI device handler infrastructure.
      4 *
      5 * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
      6 *
      7 * Copyright IBM Corporation, 2007
      8 *      Authors:
      9 *               Chandra Seetharaman <sekharan@us.ibm.com>
     10 *               Mike Anderson <andmike@linux.vnet.ibm.com>
     11 */
     12
     13#include <scsi/scsi_device.h>
     14
     15enum {
     16	SCSI_DH_OK = 0,
     17	/*
     18	 * device errors
     19	 */
     20	SCSI_DH_DEV_FAILED,	/* generic device error */
     21	SCSI_DH_DEV_TEMP_BUSY,
     22	SCSI_DH_DEV_UNSUPP,	/* device handler not supported */
     23	SCSI_DH_DEVICE_MAX,	/* max device blkerr definition */
     24
     25	/*
     26	 * transport errors
     27	 */
     28	SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
     29	SCSI_DH_CONN_FAILURE,
     30	SCSI_DH_TRANSPORT_MAX,	/* max transport blkerr definition */
     31
     32	/*
     33	 * driver and generic errors
     34	 */
     35	SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1,	/* generic error */
     36	SCSI_DH_INVALID_IO,
     37	SCSI_DH_RETRY,		/* retry the req, but not immediately */
     38	SCSI_DH_IMM_RETRY,	/* immediately retry the req */
     39	SCSI_DH_TIMED_OUT,
     40	SCSI_DH_RES_TEMP_UNAVAIL,
     41	SCSI_DH_DEV_OFFLINED,
     42	SCSI_DH_NOMEM,
     43	SCSI_DH_NOSYS,
     44	SCSI_DH_DRIVER_MAX,
     45};
     46
     47typedef void (*activate_complete)(void *, int);
     48struct scsi_device_handler {
     49	/* Used by the infrastructure */
     50	struct list_head list; /* list of scsi_device_handlers */
     51
     52	/* Filled by the hardware handler */
     53	struct module *module;
     54	const char *name;
     55	enum scsi_disposition (*check_sense)(struct scsi_device *,
     56					     struct scsi_sense_hdr *);
     57	int (*attach)(struct scsi_device *);
     58	void (*detach)(struct scsi_device *);
     59	int (*activate)(struct scsi_device *, activate_complete, void *);
     60	blk_status_t (*prep_fn)(struct scsi_device *, struct request *);
     61	int (*set_params)(struct scsi_device *, const char *);
     62	void (*rescan)(struct scsi_device *);
     63};
     64
     65#ifdef CONFIG_SCSI_DH
     66extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
     67extern int scsi_dh_attach(struct request_queue *, const char *);
     68extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
     69extern int scsi_dh_set_params(struct request_queue *, const char *);
     70#else
     71static inline int scsi_dh_activate(struct request_queue *req,
     72					activate_complete fn, void *data)
     73{
     74	fn(data, 0);
     75	return 0;
     76}
     77static inline int scsi_dh_attach(struct request_queue *req, const char *name)
     78{
     79	return SCSI_DH_NOSYS;
     80}
     81static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
     82							gfp_t gfp)
     83{
     84	return NULL;
     85}
     86static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
     87{
     88	return -SCSI_DH_NOSYS;
     89}
     90#endif