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2024-01-31 f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 
 kernel/include/scsi/scsi_host.h
....@@ -12,7 +12,6 @@
1212 #include <scsi/scsi.h>
1313 #include <linux/android_kabi.h>
1414 
15
-struct request_queue;
1615 struct block_device;
1716 struct completion;
1817 struct module;
....@@ -23,30 +22,13 @@
2322 struct Scsi_Host;
2423 struct scsi_host_cmd_pool;
2524 struct scsi_transport_template;
26
-struct blk_queue_tags;
2725 
2826 
29
-/*
30
- * The various choices mean:
31
- * NONE: Self evident.	Host adapter is not capable of scatter-gather.
32
- * ALL:	 Means that the host adapter module can do scatter-gather,
33
- *	 and that there is no limit to the size of the table to which
34
- *	 we scatter/gather data.  The value we set here is the maximum
35
- *	 single element sglist.  To use chained sglists, the adapter
36
- *	 has to set a value beyond ALL (and correctly use the chain
37
- *	 handling API.
38
- * Anything else:  Indicates the maximum number of chains that can be
39
- *	 used in one scatter-gather request.
40
- */
41
-#define SG_NONE 0
4227 #define SG_ALL	SG_CHUNK_SIZE
4328 
4429 #define MODE_UNKNOWN 0x00
4530 #define MODE_INITIATOR 0x01
4631 #define MODE_TARGET 0x02
47
-
48
-#define DISABLE_CLUSTERING 0
49
-#define ENABLE_CLUSTERING 1
5032 
5133 struct scsi_host_template {
5234 	struct module *module;
....@@ -66,7 +48,8 @@
6648 	 *
6749 	 * Status: OPTIONAL
6850 	 */
69
-	int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg);
51
+	int (*ioctl)(struct scsi_device *dev, unsigned int cmd,
52
+		     void __user *arg);
7053 
7154 
7255 #ifdef CONFIG_COMPAT
....@@ -76,16 +59,22 @@
7659 	 *
7760 	 * Status: OPTIONAL
7861 	 */
79
-	int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg);
62
+	int (*compat_ioctl)(struct scsi_device *dev, unsigned int cmd,
63
+			    void __user *arg);
8064 #endif
65
+
66
+	int (*init_cmd_priv)(struct Scsi_Host *shost, struct scsi_cmnd *cmd);
67
+	int (*exit_cmd_priv)(struct Scsi_Host *shost, struct scsi_cmnd *cmd);
8168 
8269 	/*
8370 	 * The queuecommand function is used to queue up a scsi
8471 	 * command block to the LLDD.  When the driver finished
8572 	 * processing the command the done callback is invoked.
8673 	 *
87
-	 * If queuecommand returns 0, then the HBA has accepted the
88
-	 * command.  The done() function must be called on the command
74
+	 * If queuecommand returns 0, then the driver has accepted the
75
+	 * command.  It must also push it to the HBA if the scsi_cmnd
76
+	 * flag SCMD_LAST is set, or if the driver does not implement
77
+	 * commit_rqs.  The done() function must be called on the command
8978 	 * when the driver has finished with it. (you may call done on the
9079 	 * command before queuecommand returns, but in this case you
9180 	 * *must* return 0 from queuecommand).
....@@ -112,6 +101,16 @@
112101 	 * STATUS: REQUIRED
113102 	 */
114103 	int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
104
+
105
+	/*
106
+	 * The commit_rqs function is used to trigger a hardware
107
+	 * doorbell after some requests have been queued with
108
+	 * queuecommand, when an error is encountered before sending
109
+	 * the request with SCMD_LAST set.
110
+	 *
111
+	 * STATUS: OPTIONAL
112
+	 */
113
+	void (*commit_rqs)(struct Scsi_Host *, u16);
115114 
116115 	/*
117116 	 * This is an error handling strategy routine.  You don't need to
....@@ -273,6 +272,13 @@
273272 	int (* map_queues)(struct Scsi_Host *shost);
274273 
275274 	/*
275
+	 * Check if scatterlists need to be padded for DMA draining.
276
+	 *
277
+	 * Status: OPTIONAL
278
+	 */
279
+	bool (* dma_need_drain)(struct request *rq);
280
+
281
+	/*
276282 	 * This function determines the BIOS parameters for a given
277283 	 * harddisk.  These tend to be numbers that are made up by
278284 	 * the host adapter.  Parameters:
....@@ -304,11 +310,7 @@
304310 	/*
305311 	 * This is an optional routine that allows the transport to become
306312 	 * involved when a scsi io timer fires. The return value tells the
307
-	 * timer routine how to finish the io timeout handling:
308
-	 * EH_HANDLED:		I fixed the error, please complete the command
309
-	 * EH_RESET_TIMER:	I need more time, reset the timer and
310
-	 *			begin counting again
311
-	 * EH_DONE:		Begin normal error recovery
313
+	 * timer routine how to finish the io timeout handling.
312314 	 *
313315 	 * Status: OPTIONAL
314316 	 */
....@@ -341,7 +343,7 @@
341343 	/*
342344 	 * This determines if we will use a non-interrupt driven
343345 	 * or an interrupt driven scheme.  It is set to the maximum number
344
-	 * of simultaneous commands a given host adapter will accept.
346
+	 * of simultaneous commands a single hw queue in HBA will accept.
345347 	 */
346348 	int can_queue;
347349 
....@@ -367,10 +369,17 @@
367369 	unsigned int max_sectors;
368370 
369371 	/*
372
+	 * Maximum size in bytes of a single segment.
373
+	 */
374
+	unsigned int max_segment_size;
375
+
376
+	/*
370377 	 * DMA scatter gather segment boundary limit. A segment crossing this
371378 	 * boundary will be split in two.
372379 	 */
373380 	unsigned long dma_boundary;
381
+
382
+	unsigned long virt_boundary_mask;
374383 
375384 	/*
376385 	 * This specifies "machine infinity" for host templates which don't
....@@ -416,16 +425,6 @@
416425 	unsigned unchecked_isa_dma:1;
417426 
418427 	/*
419
-	 * True if this host adapter can make good use of clustering.
420
-	 * I originally thought that if the tablesize was large that it
421
-	 * was a waste of CPU cycles to prepare a cluster list, but
422
-	 * it works out that the Buslogic is faster if you use a smaller
423
-	 * number of segments (i.e. use clustering).  I guess it is
424
-	 * inefficient.
425
-	 */
426
-	unsigned use_clustering:1;
427
-
428
-	/*
429428 	 * True for emulated SCSI host adapters (e.g. ATAPI).
430429 	 */
431430 	unsigned emulated:1;
....@@ -438,8 +437,8 @@
438437 	/* True if the controller does not support WRITE SAME */
439438 	unsigned no_write_same:1;
440439 
441
-	/* True if the low-level driver supports blk-mq only */
442
-	unsigned force_blk_mq:1;
440
+	/* True if the host uses host-wide tagspace */
441
+	unsigned host_tagset:1;
443442 
444443 	/*
445444 	 * Countdown for host blocking with no commands outstanding.
....@@ -507,7 +506,6 @@
507506 		unsigned long irq_flags;				\
508507 		int rc;							\
509508 		spin_lock_irqsave(shost->host_lock, irq_flags);		\
510
-		scsi_cmd_get_serial(shost, cmd);			\
511509 		rc = func_name##_lck (cmd, cmd->scsi_done);			\
512510 		spin_unlock_irqrestore(shost->host_lock, irq_flags);	\
513511 		return rc;						\
....@@ -556,16 +554,9 @@
556554 	struct scsi_host_template *hostt;
557555 	struct scsi_transport_template *transportt;
558556 
559
-	/*
560
-	 * Area to keep a shared tag map (if needed, will be
561
-	 * NULL if not).
562
-	 */
563
-	union {
564
-		struct blk_queue_tag	*bqt;
565
-		struct blk_mq_tag_set	tag_set;
566
-	};
557
+	/* Area to keep a shared tag map */
558
+	struct blk_mq_tag_set	tag_set;
567559 
568
-	atomic_t host_busy;		   /* commands actually active on low-level */
569560 	atomic_t host_blocked;
570561 
571562 	unsigned int host_failed;	   /* commands that failed.
....@@ -613,24 +604,20 @@
613604 	short unsigned int sg_tablesize;
614605 	short unsigned int sg_prot_tablesize;
615606 	unsigned int max_sectors;
607
+	unsigned int max_segment_size;
616608 	unsigned long dma_boundary;
609
+	unsigned long virt_boundary_mask;
617610 	/*
618611 	 * In scsi-mq mode, the number of hardware queues supported by the LLD.
619612 	 *
620613 	 * Note: it is assumed that each hardware queue has a queue depth of
621614 	 * can_queue. In other words, the total queue depth per host
622
-	 * is nr_hw_queues * can_queue.
615
+	 * is nr_hw_queues * can_queue. However, for when host_tagset is set,
616
+	 * the total queue depth is can_queue.
623617 	 */
624618 	unsigned nr_hw_queues;
625
-	/* 
626
-	 * Used to assign serial numbers to the cmds.
627
-	 * Protected by the host lock.
628
-	 */
629
-	unsigned long cmd_serial_number;
630
-	
631619 	unsigned active_mode:2;
632620 	unsigned unchecked_isa_dma:1;
633
-	unsigned use_clustering:1;
634621 
635622 	/*
636623 	 * Host has requested that no further requests come through for the
....@@ -657,17 +644,14 @@
657644 	/* The controller does not support WRITE SAME */
658645 	unsigned no_write_same:1;
659646 
660
-	unsigned use_blk_mq:1;
661
-	unsigned use_cmd_list:1;
647
+	/* True if the host uses host-wide tagspace */
648
+	unsigned host_tagset:1;
662649 
663650 	/* Host responded with short (<36 bytes) INQUIRY result */
664651 	unsigned short_inquiry:1;
665652 
666
-	/*
667
-	 * Set "DBD" field in mode_sense caching mode page in case it is
668
-	 * mandatory by LLD standard.
669
-	 */
670
-	unsigned set_dbd_for_caching:1;
653
+	/* The transport requires the LUN bits NOT to be stored in CDB[1] */
654
+	unsigned no_scsi2_lun_in_cdb:1;
671655 
672656 	/*
673657 	 * Optional work queue to be utilized by the transport
....@@ -679,9 +663,6 @@
679663 	 * Task management function work queue
680664 	 */
681665 	struct workqueue_struct *tmf_work_q;
682
-
683
-	/* The transport requires the LUN bits NOT to be stored in CDB[1] */
684
-	unsigned no_scsi2_lun_in_cdb:1;
685666 
686667 	/*
687668 	 * Value host_blocked counts down from
....@@ -717,12 +698,14 @@
717698 	 */
718699 	struct device *dma_dev;
719700 
701
+	ANDROID_KABI_RESERVE(1);
702
+
720703 	/*
721704 	 * We should ensure that this is aligned, both for better performance
722705 	 * and also because some compilers (m68k) don't automatically force
723706 	 * alignment to a long boundary.
724707 	 */
725
-	unsigned long hostdata[0]  /* Used for storage of host specific stuff */
708
+	unsigned long hostdata[]  /* Used for storage of host specific stuff */
726709 		__attribute__ ((aligned (sizeof(unsigned long))));
727710 };
728711 
....@@ -757,11 +740,6 @@
757740 		shost->tmf_in_progress;
758741 }
759742 
760
-static inline bool shost_use_blk_mq(struct Scsi_Host *shost)
761
-{
762
-	return shost->use_blk_mq;
763
-}
764
-
765743 extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *);
766744 extern void scsi_flush_work(struct Scsi_Host *);
767745 
....@@ -777,7 +755,8 @@
777755 extern void scsi_host_put(struct Scsi_Host *t);
778756 extern struct Scsi_Host *scsi_host_lookup(unsigned short);
779757 extern const char *scsi_host_state_name(enum scsi_host_state);
780
-extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *);
758
+extern void scsi_host_complete_all_commands(struct Scsi_Host *shost,
759
+					    int status);
781760 
782761 static inline int __must_check scsi_add_host(struct Scsi_Host *host,
783762 					     struct device *dev)
....@@ -802,6 +781,11 @@
802781 
803782 extern void scsi_unblock_requests(struct Scsi_Host *);
804783 extern void scsi_block_requests(struct Scsi_Host *);
784
+extern int scsi_host_block(struct Scsi_Host *shost);
785
+extern int scsi_host_unblock(struct Scsi_Host *shost, int new_state);
786
+
787
+void scsi_host_busy_iter(struct Scsi_Host *,
788
+			 bool (*fn)(struct scsi_cmnd *, void *, bool), void *priv);
805789 
806790 struct class_container;
807791