Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI updates from James Bottomley:
 "Usual driver updates (ufs, lpfc, target, qla2xxx) plus assorted
  cleanups and fixes including the WQ_PERCPU series.

  The biggest core change is the new allocation of pseudo-devices which
  allow the sending of internal commands to a given SCSI target"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (147 commits)
  scsi: MAINTAINERS: Add the UFS include directory
  scsi: scsi_debug: Support injecting unaligned write errors
  scsi: qla2xxx: Fix improper freeing of purex item
  scsi: ufs: rockchip: Fix compile error without CONFIG_GPIOLIB
  scsi: ufs: rockchip: Reset controller on PRE_CHANGE of hce enable notify
  scsi: ufs: core: Use scsi_device_busy()
  scsi: ufs: core: Fix single doorbell mode support
  scsi: pm80xx: Add WQ_PERCPU to alloc_workqueue() users
  scsi: target: Add WQ_PERCPU to alloc_workqueue() users
  scsi: qedi: Add WQ_PERCPU to alloc_workqueue() users
  scsi: target: ibmvscsi: Add WQ_PERCPU to alloc_workqueue() users
  scsi: qedf: Add WQ_PERCPU to alloc_workqueue() users
  scsi: bnx2fc: Add WQ_PERCPU to alloc_workqueue() users
  scsi: be2iscsi: Add WQ_PERCPU to alloc_workqueue() users
  scsi: message: fusion: Add WQ_PERCPU to alloc_workqueue() users
  scsi: lpfc: WQ_PERCPU added to alloc_workqueue() users
  scsi: scsi_transport_fc: WQ_PERCPU added to alloc_workqueue users()
  scsi: scsi_dh_alua: WQ_PERCPU added to alloc_workqueue() users
  scsi: qla2xxx: WQ_PERCPU added to alloc_workqueue() users
  scsi: target: sbp: Replace use of system_unbound_wq with system_dfl_wq
  ...

3 files changed, 62 insertions, 5 deletions

diff --git a/include/scsi/scsi_dbg.h b/include/scsi/scsi_dbg.h
index bd29cdb513a5..efcdc78530d5 100644
--- a/include/scsi/scsi_dbg.h
+++ b/include/scsi/scsi_dbg.h
@@ -11,11 +11,11 @@ extern size_t __scsi_format_command(char *, size_t,
 				   const unsigned char *, size_t);
 extern void scsi_print_sense_hdr(const struct scsi_device *, const char *,
 				 const struct scsi_sense_hdr *);
-extern void scsi_print_sense(const struct scsi_cmnd *);
+extern void scsi_print_sense(struct scsi_cmnd *);
 extern void __scsi_print_sense(const struct scsi_device *, const char *name,
 			       const unsigned char *sense_buffer,
 			       int sense_len);
-extern void scsi_print_result(const struct scsi_cmnd *, const char *, int);
+extern void scsi_print_result(struct scsi_cmnd *, const char *, int);
 
 #ifdef CONFIG_SCSI_CONSTANTS
 extern bool scsi_opcode_sa_name(int, int, const char **, const char **);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 993008cdea65..d32f5841f4f8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -179,6 +179,12 @@ struct scsi_device {
 	unsigned manage_shutdown:1;
 
 	/*
+	 * If true, let the high-level device driver (sd) manage the device
+	 * power state for system restart (reboot) operations.
+	 */
+	unsigned manage_restart:1;
+
+	/*
 	 * If set and if the device is runtime suspended, ask the high-level
 	 * device driver (sd) to force a runtime resume of the device.
 	 */
@@ -313,8 +319,8 @@ sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
 #define sdev_printk(l, sdev, fmt, a...)				\
 	sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
 
-__printf(3, 4) void
-scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
+__printf(3, 4) void scmd_printk(const char *, struct scsi_cmnd *, const char *,
+				...);
 
 #define scmd_dbg(scmd, fmt, a...)					\
 	do {								\
@@ -558,6 +564,10 @@ int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
 		     const struct scsi_exec_args *args);
 void scsi_failures_reset_retries(struct scsi_failures *failures);
 
+struct scsi_cmnd *scsi_get_internal_cmd(struct scsi_device *sdev,
+					enum dma_data_direction data_direction,
+					blk_mq_req_flags_t flags);
+void scsi_put_internal_cmd(struct scsi_cmnd *scmd);
 extern void sdev_disable_disk_events(struct scsi_device *sdev);
 extern void sdev_enable_disk_events(struct scsi_device *sdev);
 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
@@ -589,6 +599,22 @@ static inline unsigned int sdev_id(struct scsi_device *sdev)
 #define scmd_id(scmd) sdev_id((scmd)->device)
 #define scmd_channel(scmd) sdev_channel((scmd)->device)
 
+/**
+ * scsi_device_is_pseudo_dev() - Whether a device is a pseudo SCSI device.
+ * @sdev: SCSI device to examine
+ *
+ * A pseudo SCSI device can be used to allocate SCSI commands but does not show
+ * up in sysfs. Additionally, the logical unit information in *@sdev is made up.
+ *
+ * This function tests the LUN number instead of comparing @sdev with
+ * @sdev->host->pseudo_sdev because this function may be called before
+ * @sdev->host->pseudo_sdev has been initialized.
+ */
+static inline bool scsi_device_is_pseudo_dev(struct scsi_device *sdev)
+{
+	return sdev->lun == U64_MAX;
+}
+
 /*
  * checks for positions of the SCSI state machine
  */
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index f5a243261236..e87cf7eadd26 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -87,6 +87,12 @@ struct scsi_host_template {
 	int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
 
 	/*
+	 * Queue a reserved command (BLK_MQ_REQ_RESERVED). The .queuecommand()
+	 * documentation also applies to the .queue_reserved_command() callback.
+	 */
+	int (*queue_reserved_command)(struct Scsi_Host *, struct scsi_cmnd *);
+
+	/*
 	 * The commit_rqs function is used to trigger a hardware
 	 * doorbell after some requests have been queued with
 	 * queuecommand, when an error is encountered before sending
@@ -375,11 +381,20 @@ struct scsi_host_template {
 	/*
 	 * This determines if we will use a non-interrupt driven
 	 * or an interrupt driven scheme.  It is set to the maximum number
-	 * of simultaneous commands a single hw queue in HBA will accept.
+	 * of simultaneous commands a single hw queue in HBA will accept
+	 * excluding internal commands.
 	 */
 	int can_queue;
 
 	/*
+	 * This determines how many commands the HBA will set aside
+	 * for internal commands. This number will be added to
+	 * @can_queue to calculate the maximum number of simultaneous
+	 * commands sent to the host.
+	 */
+	int nr_reserved_cmds;
+
+	/*
 	 * In many instances, especially where disconnect / reconnect are
 	 * supported, our host also has an ID on the SCSI bus.  If this is
 	 * the case, then it must be reserved.  Please set this_id to -1 if
@@ -611,7 +626,17 @@ struct Scsi_Host {
 	unsigned short max_cmd_len;
 
 	int this_id;
+
+	/*
+	 * Number of commands this host can handle at the same time.
+	 * This excludes reserved commands as specified by nr_reserved_cmds.
+	 */
 	int can_queue;
+	/*
+	 * Number of reserved commands to allocate, if any.
+	 */
+	unsigned int nr_reserved_cmds;
+
 	short cmd_per_lun;
 	short unsigned int sg_tablesize;
 	short unsigned int sg_prot_tablesize;
@@ -703,6 +728,12 @@ struct Scsi_Host {
 	struct device		shost_gendev, shost_dev;
 
 	/*
+	 * A SCSI device structure used for sending internal commands to the
+	 * HBA. There is no corresponding logical unit inside the SCSI device.
+	 */
+	struct scsi_device *pseudo_sdev;
+
+	/*
 	 * Points to the transport data (if any) which is allocated
 	 * separately
 	 */