[PATCH 0/4] scsi: remove legacy cmd_list implementation

[PATCH 0/4] scsi: remove legacy cmd_list implementation

[Hannes Reinecke]

Hi all,

with the switch to blk-mq we have an efficient way of looking up
outstanding commands via blk_mq_rq_busy_iter().
In this patchset the dpt_i2o and aacraid drivers are switched over
to using that function, and the now obsolete cmd_list implemantation
in the SCSI midlayer is removed.

As usual, comments and reviews are welcome.

Hannes Reinecke (4):
  dpt_i2o: use midlayer tcq implementation
  dpt_i2o: make adpt_i2o_to_scsi() a void function
  aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands
  scsi: Remove cmd_list functionality

 drivers/scsi/aacraid/aachba.c   | 127 ++++++++++++++++++++++------------------
 drivers/scsi/aacraid/comminit.c |  30 ++++------
 drivers/scsi/aacraid/commsup.c  |  38 +++++-------
 drivers/scsi/aacraid/linit.c    |  87 ++++++++++++++-------------
 drivers/scsi/dpt_i2o.c          |  27 ++++-----
 drivers/scsi/dpti.h             |   2 +-
 drivers/scsi/scsi.c             |  14 -----
 drivers/scsi/scsi_error.c       |   1 -
 drivers/scsi/scsi_lib.c         |  32 ----------
 drivers/scsi/scsi_priv.h        |   2 -
 drivers/scsi/scsi_scan.c        |   1 -
 include/scsi/scsi_cmnd.h        |   1 -
 include/scsi/scsi_device.h      |   1 -
 include/scsi/scsi_host.h        |   2 -
 14 files changed, 160 insertions(+), 205 deletions(-)

-- 
2.16.4

[PATCH 1/4] dpt_i2o: use midlayer tcq implementation

[Hannes Reinecke]

Switch to use the SCSI midlayer TCQ implementation and drop the
use of the scsi command list.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/dpt_i2o.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index abc74fd474dc..cf0851563f57 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2335,7 +2335,6 @@ static s32 adpt_scsi_host_alloc(adpt_hba* pHba, struct scsi_host_template *sht)
 	host->unique_id = (u32)sys_tbl_pa + pHba->unit;
 	host->sg_tablesize = pHba->sg_tablesize;
 	host->can_queue = pHba->post_fifo_size;
-	host->use_cmd_list = 1;
 
 	return 0;
 }
@@ -2647,20 +2646,19 @@ static s32 adpt_i2o_reparse_lct(adpt_hba* pHba)
 	return 0;
 }
 
-static void adpt_fail_posted_scbs(adpt_hba* pHba)
+bool fail_posted_scbs_iter(struct request *rq, void *data, bool reserved)
 {
-	struct scsi_cmnd* 	cmd = NULL;
-	struct scsi_device* 	d = NULL;
+	struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
 
-	shost_for_each_device(d, pHba->host) {
-		unsigned long flags;
-		spin_lock_irqsave(&d->list_lock, flags);
-		list_for_each_entry(cmd, &d->cmd_list, list) {
-			cmd->result = (DID_OK << 16) | (QUEUE_FULL <<1);
-			cmd->scsi_done(cmd);
-		}
-		spin_unlock_irqrestore(&d->list_lock, flags);
-	}
+	cmd->result = (DID_OK << 16) | (QUEUE_FULL <<1);
+	cmd->scsi_done(cmd);
+
+	return true;
+}
+
+static void adpt_fail_posted_scbs(adpt_hba* pHba)
+{
+	blk_mq_tagset_busy_iter(&pHba->host->tag_set, fail_posted_scbs_iter, NULL);
 }
 
 
-- 
2.16.4

[PATCH 2/4] dpt_i2o: make adpt_i2o_to_scsi() a void function

[Hannes Reinecke]

The return value is never used anywhere, and returning it
risks a use-after-free crash.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/dpt_i2o.c | 3 +--
 drivers/scsi/dpti.h    | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index cf0851563f57..9fc3bb53880f 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2340,7 +2340,7 @@ static s32 adpt_scsi_host_alloc(adpt_hba* pHba, struct scsi_host_template *sht)
 }
 
 
-static s32 adpt_i2o_to_scsi(void __iomem *reply, struct scsi_cmnd* cmd)
+static void adpt_i2o_to_scsi(void __iomem *reply, struct scsi_cmnd* cmd)
 {
 	adpt_hba* pHba;
 	u32 hba_status;
@@ -2458,7 +2458,6 @@ static s32 adpt_i2o_to_scsi(void __iomem *reply, struct scsi_cmnd* cmd)
 	if(cmd->scsi_done != NULL){
 		cmd->scsi_done(cmd);
 	} 
-	return cmd->result;
 }
 
 
diff --git a/drivers/scsi/dpti.h b/drivers/scsi/dpti.h
index 42b1e28b5884..1f344a2ac0f5 100644
--- a/drivers/scsi/dpti.h
+++ b/drivers/scsi/dpti.h
@@ -286,7 +286,7 @@ static s32 adpt_i2o_status_get(adpt_hba* pHba);
 static s32 adpt_i2o_init_outbound_q(adpt_hba* pHba);
 static s32 adpt_i2o_hrt_get(adpt_hba* pHba);
 static s32 adpt_scsi_to_i2o(adpt_hba* pHba, struct scsi_cmnd* cmd, struct adpt_device* dptdevice);
-static s32 adpt_i2o_to_scsi(void __iomem *reply, struct scsi_cmnd* cmd);
+static void adpt_i2o_to_scsi(void __iomem *reply, struct scsi_cmnd* cmd);
 static s32 adpt_scsi_host_alloc(adpt_hba* pHba,struct scsi_host_template * sht);
 static s32 adpt_hba_reset(adpt_hba* pHba);
 static s32 adpt_i2o_reset_hba(adpt_hba* pHba);
-- 
2.16.4

[PATCH 3/4] aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands

[Hannes Reinecke]

Use blk_mq_rq_busy_iter() for traversing outstanding commands and
drop the cmd_list usage.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/aacraid/aachba.c   | 127 ++++++++++++++++++++++------------------
 drivers/scsi/aacraid/comminit.c |  30 ++++------
 drivers/scsi/aacraid/commsup.c  |  38 +++++-------
 drivers/scsi/aacraid/linit.c    |  87 ++++++++++++++-------------
 4 files changed, 147 insertions(+), 135 deletions(-)

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index e36608ce937a..df590240e2c9 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2639,81 +2639,96 @@ static void synchronize_callback(void *context, struct fib *fibptr)
 	cmd->scsi_done(cmd);
 }
 
+struct synchronize_busy_data {
+	struct scsi_device *sdev;
+	u64 lba;
+	u32 count;
+	int active;
+};
+
+static bool synchronize_busy_iter(struct request *req, void *data, bool reserved)
+{
+	struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
+	struct synchronize_busy_data *busy_data = data;
+
+	if (busy_data->sdev == cmd->device &&
+	    cmd->SCp.phase == AAC_OWNER_FIRMWARE) {
+		u64 cmnd_lba;
+		u32 cmnd_count;
+
+		if (cmd->cmnd[0] == WRITE_6) {
+			cmnd_lba = ((cmd->cmnd[1] & 0x1F) << 16) |
+				(cmd->cmnd[2] << 8) |
+				cmd->cmnd[3];
+			cmnd_count = cmd->cmnd[4];
+			if (cmnd_count == 0)
+				cmnd_count = 256;
+		} else if (cmd->cmnd[0] == WRITE_16) {
+			cmnd_lba = ((u64)cmd->cmnd[2] << 56) |
+				((u64)cmd->cmnd[3] << 48) |
+				((u64)cmd->cmnd[4] << 40) |
+				((u64)cmd->cmnd[5] << 32) |
+				((u64)cmd->cmnd[6] << 24) |
+				(cmd->cmnd[7] << 16) |
+				(cmd->cmnd[8] << 8) |
+				cmd->cmnd[9];
+			cmnd_count = (cmd->cmnd[10] << 24) |
+				(cmd->cmnd[11] << 16) |
+				(cmd->cmnd[12] << 8) |
+				cmd->cmnd[13];
+		} else if (cmd->cmnd[0] == WRITE_12) {
+			cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
+				(cmd->cmnd[3] << 16) |
+				(cmd->cmnd[4] << 8) |
+				cmd->cmnd[5];
+			cmnd_count = (cmd->cmnd[6] << 24) |
+				(cmd->cmnd[7] << 16) |
+				(cmd->cmnd[8] << 8) |
+				cmd->cmnd[9];
+		} else if (cmd->cmnd[0] == WRITE_10) {
+			cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
+				(cmd->cmnd[3] << 16) |
+				(cmd->cmnd[4] << 8) |
+				cmd->cmnd[5];
+			cmnd_count = (cmd->cmnd[7] << 8) |
+				cmd->cmnd[8];
+		} else
+			return true;
+		if (((cmnd_lba + cmnd_count) < busy_data->lba) ||
+		    (busy_data->count && ((busy_data->lba + busy_data->count) < cmnd_lba)))
+			return true;;
+		++busy_data->active;
+	}
+	return true;
+}
+
 static int aac_synchronize(struct scsi_cmnd *scsicmd)
 {
 	int status;
 	struct fib *cmd_fibcontext;
 	struct aac_synchronize *synchronizecmd;
-	struct scsi_cmnd *cmd;
 	struct scsi_device *sdev = scsicmd->device;
-	int active = 0;
 	struct aac_dev *aac;
 	u64 lba = ((u64)scsicmd->cmnd[2] << 24) | (scsicmd->cmnd[3] << 16) |
 		(scsicmd->cmnd[4] << 8) | scsicmd->cmnd[5];
 	u32 count = (scsicmd->cmnd[7] << 8) | scsicmd->cmnd[8];
-	unsigned long flags;
+	struct synchronize_busy_data busy_data = {
+		.sdev = sdev,
+		.lba = lba,
+		.count = count,
+		.active = 0,
+	};
 
 	/*
 	 * Wait for all outstanding queued commands to complete to this
 	 * specific target (block).
 	 */
-	spin_lock_irqsave(&sdev->list_lock, flags);
-	list_for_each_entry(cmd, &sdev->cmd_list, list)
-		if (cmd->SCp.phase == AAC_OWNER_FIRMWARE) {
-			u64 cmnd_lba;
-			u32 cmnd_count;
-
-			if (cmd->cmnd[0] == WRITE_6) {
-				cmnd_lba = ((cmd->cmnd[1] & 0x1F) << 16) |
-					(cmd->cmnd[2] << 8) |
-					cmd->cmnd[3];
-				cmnd_count = cmd->cmnd[4];
-				if (cmnd_count == 0)
-					cmnd_count = 256;
-			} else if (cmd->cmnd[0] == WRITE_16) {
-				cmnd_lba = ((u64)cmd->cmnd[2] << 56) |
-					((u64)cmd->cmnd[3] << 48) |
-					((u64)cmd->cmnd[4] << 40) |
-					((u64)cmd->cmnd[5] << 32) |
-					((u64)cmd->cmnd[6] << 24) |
-					(cmd->cmnd[7] << 16) |
-					(cmd->cmnd[8] << 8) |
-					cmd->cmnd[9];
-				cmnd_count = (cmd->cmnd[10] << 24) |
-					(cmd->cmnd[11] << 16) |
-					(cmd->cmnd[12] << 8) |
-					cmd->cmnd[13];
-			} else if (cmd->cmnd[0] == WRITE_12) {
-				cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
-					(cmd->cmnd[3] << 16) |
-					(cmd->cmnd[4] << 8) |
-					cmd->cmnd[5];
-				cmnd_count = (cmd->cmnd[6] << 24) |
-					(cmd->cmnd[7] << 16) |
-					(cmd->cmnd[8] << 8) |
-					cmd->cmnd[9];
-			} else if (cmd->cmnd[0] == WRITE_10) {
-				cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
-					(cmd->cmnd[3] << 16) |
-					(cmd->cmnd[4] << 8) |
-					cmd->cmnd[5];
-				cmnd_count = (cmd->cmnd[7] << 8) |
-					cmd->cmnd[8];
-			} else
-				continue;
-			if (((cmnd_lba + cmnd_count) < lba) ||
-			  (count && ((lba + count) < cmnd_lba)))
-				continue;
-			++active;
-			break;
-		}
-
-	spin_unlock_irqrestore(&sdev->list_lock, flags);
+	blk_mq_tagset_busy_iter(&sdev->host->tag_set, synchronize_busy_iter, &busy_data);
 
 	/*
 	 *	Yield the processor (requeue for later)
 	 */
-	if (active)
+	if (busy_data.active)
 		return SCSI_MLQUEUE_DEVICE_BUSY;
 
 	aac = (struct aac_dev *)sdev->host->hostdata;
diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
index f75878d773cf..72cdf47437fe 100644
--- a/drivers/scsi/aacraid/comminit.c
+++ b/drivers/scsi/aacraid/comminit.c
@@ -272,29 +272,25 @@ static void aac_queue_init(struct aac_dev * dev, struct aac_queue * q, u32 *mem,
 	q->entries = qsize;
 }
 
+static bool wait_for_io_iter(struct request *rq, void *data, bool reserved)
+{
+	struct scsi_cmnd *command = blk_mq_rq_to_pdu(rq);
+	int *active = data;
+
+	if (command->SCp.phase == AAC_OWNER_FIRMWARE)
+		*active = 1;
+	return true;
+}
+
 static void aac_wait_for_io_completion(struct aac_dev *aac)
 {
-	unsigned long flagv = 0;
-	int i = 0;
+	int i;
 
 	for (i = 60; i; --i) {
-		struct scsi_device *dev;
-		struct scsi_cmnd *command;
 		int active = 0;
 
-		__shost_for_each_device(dev, aac->scsi_host_ptr) {
-			spin_lock_irqsave(&dev->list_lock, flagv);
-			list_for_each_entry(command, &dev->cmd_list, list) {
-				if (command->SCp.phase == AAC_OWNER_FIRMWARE) {
-					active++;
-					break;
-				}
-			}
-			spin_unlock_irqrestore(&dev->list_lock, flagv);
-			if (active)
-				break;
-
-		}
+		blk_mq_tagset_busy_iter(&aac->scsi_host_ptr->tag_set,
+					wait_for_io_iter, &active);
 		/*
 		 * We can exit If all the commands are complete
 		 */
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 5a8a999606ea..218b0954b91c 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -1472,14 +1472,26 @@ static void aac_schedule_bus_scan(struct aac_dev *aac)
 		aac_schedule_src_reinit_aif_worker(aac);
 }
 
+static bool reset_adapter_complete_iter(struct request *rq, void *data, bool reserved)
+{
+	struct scsi_cmnd *command = blk_mq_rq_to_pdu(rq);
+
+	if (command->SCp.phase == AAC_OWNER_FIRMWARE) {
+		command->result = DID_OK << 16
+		  | COMMAND_COMPLETE << 8
+		  | SAM_STAT_TASK_SET_FULL;
+		command->SCp.phase = AAC_OWNER_ERROR_HANDLER;
+		command->scsi_done(command);
+	}
+	return true;
+}
+
 static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
 {
 	int index, quirks;
 	int retval;
 	struct Scsi_Host *host;
 	struct scsi_device *dev;
-	struct scsi_cmnd *command;
-	struct scsi_cmnd *command_list;
 	int jafo = 0;
 	int bled;
 	u64 dmamask;
@@ -1607,26 +1619,8 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
 	 * This is where the assumption that the Adapter is quiesced
 	 * is important.
 	 */
-	command_list = NULL;
-	__shost_for_each_device(dev, host) {
-		unsigned long flags;
-		spin_lock_irqsave(&dev->list_lock, flags);
-		list_for_each_entry(command, &dev->cmd_list, list)
-			if (command->SCp.phase == AAC_OWNER_FIRMWARE) {
-				command->SCp.buffer = (struct scatterlist *)command_list;
-				command_list = command;
-			}
-		spin_unlock_irqrestore(&dev->list_lock, flags);
-	}
-	while ((command = command_list)) {
-		command_list = (struct scsi_cmnd *)command->SCp.buffer;
-		command->SCp.buffer = NULL;
-		command->result = DID_OK << 16
-		  | COMMAND_COMPLETE << 8
-		  | SAM_STAT_TASK_SET_FULL;
-		command->SCp.phase = AAC_OWNER_ERROR_HANDLER;
-		command->scsi_done(command);
-	}
+	blk_mq_tagset_busy_iter(&host->tag_set, reset_adapter_complete_iter, NULL);
+
 	/*
 	 * Any Device that was already marked offline needs to be marked
 	 * running
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index ee6bc2f9b80a..30af9eef6774 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -622,54 +622,62 @@ static int aac_ioctl(struct scsi_device *sdev, unsigned int cmd,
 	return aac_do_ioctl(dev, cmd, arg);
 }
 
-static int get_num_of_incomplete_fibs(struct aac_dev *aac)
+struct fib_count_data {
+	int mlcnt;
+	int llcnt;
+	int ehcnt;
+	int fwcnt;
+	int krlcnt;
+};
+
+static bool fib_count_iter(struct request *rq, void *data, bool reserved)
 {
+	struct scsi_cmnd *scmnd = blk_mq_rq_to_pdu(rq);
+	struct fib_count_data *fib_count = data;
 
-	unsigned long flags;
-	struct scsi_device *sdev = NULL;
+	switch (scmnd->SCp.phase) {
+	case AAC_OWNER_FIRMWARE:
+		fib_count->fwcnt++;
+		break;
+	case AAC_OWNER_ERROR_HANDLER:
+		fib_count->ehcnt++;
+		break;
+	case AAC_OWNER_LOWLEVEL:
+		fib_count->llcnt++;
+		break;
+	case AAC_OWNER_MIDLEVEL:
+		fib_count->mlcnt++;
+		break;
+	default:
+		fib_count->krlcnt++;
+		break;
+	}
+	return true;
+}
+
+static int get_num_of_incomplete_fibs(struct aac_dev *aac)
+{
 	struct Scsi_Host *shost = aac->scsi_host_ptr;
-	struct scsi_cmnd *scmnd = NULL;
 	struct device *ctrl_dev;
+	struct fib_count_data fib_count = {
+		.mlcnt  = 0,
+		.llcnt  = 0,
+		.ehcnt  = 0,
+		.fwcnt  = 0,
+		.krlcnt = 0,
+	};
 
-	int mlcnt  = 0;
-	int llcnt  = 0;
-	int ehcnt  = 0;
-	int fwcnt  = 0;
-	int krlcnt = 0;
-
-	__shost_for_each_device(sdev, shost) {
-		spin_lock_irqsave(&sdev->list_lock, flags);
-		list_for_each_entry(scmnd, &sdev->cmd_list, list) {
-			switch (scmnd->SCp.phase) {
-			case AAC_OWNER_FIRMWARE:
-				fwcnt++;
-				break;
-			case AAC_OWNER_ERROR_HANDLER:
-				ehcnt++;
-				break;
-			case AAC_OWNER_LOWLEVEL:
-				llcnt++;
-				break;
-			case AAC_OWNER_MIDLEVEL:
-				mlcnt++;
-				break;
-			default:
-				krlcnt++;
-				break;
-			}
-		}
-		spin_unlock_irqrestore(&sdev->list_lock, flags);
-	}
+	blk_mq_tagset_busy_iter(&shost->tag_set, fib_count_iter, &fib_count);
 
 	ctrl_dev = &aac->pdev->dev;
 
-	dev_info(ctrl_dev, "outstanding cmd: midlevel-%d\n", mlcnt);
-	dev_info(ctrl_dev, "outstanding cmd: lowlevel-%d\n", llcnt);
-	dev_info(ctrl_dev, "outstanding cmd: error handler-%d\n", ehcnt);
-	dev_info(ctrl_dev, "outstanding cmd: firmware-%d\n", fwcnt);
-	dev_info(ctrl_dev, "outstanding cmd: kernel-%d\n", krlcnt);
+	dev_info(ctrl_dev, "outstanding cmd: midlevel-%d\n", fib_count.mlcnt);
+	dev_info(ctrl_dev, "outstanding cmd: lowlevel-%d\n", fib_count.llcnt);
+	dev_info(ctrl_dev, "outstanding cmd: error handler-%d\n", fib_count.ehcnt);
+	dev_info(ctrl_dev, "outstanding cmd: firmware-%d\n", fib_count.fwcnt);
+	dev_info(ctrl_dev, "outstanding cmd: kernel-%d\n", fib_count.krlcnt);
 
-	return mlcnt + llcnt + ehcnt + fwcnt;
+	return fib_count.mlcnt + fib_count.llcnt + fib_count.ehcnt + fib_count.fwcnt;
 }
 
 static int aac_eh_abort(struct scsi_cmnd* cmd)
@@ -1675,7 +1683,6 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	shost->irq = pdev->irq;
 	shost->unique_id = unique_id;
 	shost->max_cmd_len = 16;
-	shost->use_cmd_list = 1;
 
 	if (aac_cfg_major == AAC_CHARDEV_NEEDS_REINIT)
 		aac_init_char();
-- 
2.16.4

[PATCH 4/4] scsi: Remove cmd_list functionality

[Hannes Reinecke]

Remove cmd_list functionality; no users left.
With that the scsi_put_command() becomes empty,
so remove that one, too.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/scsi.c        | 14 --------------
 drivers/scsi/scsi_error.c  |  1 -
 drivers/scsi/scsi_lib.c    | 32 --------------------------------
 drivers/scsi/scsi_priv.h   |  2 --
 drivers/scsi/scsi_scan.c   |  1 -
 include/scsi/scsi_cmnd.h   |  1 -
 include/scsi/scsi_device.h |  1 -
 include/scsi/scsi_host.h   |  2 --
 8 files changed, 54 deletions(-)

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 4f76841a7038..ae7a1adfa551 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -94,20 +94,6 @@ EXPORT_SYMBOL(scsi_logging_level);
 ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain);
 EXPORT_SYMBOL(scsi_sd_pm_domain);
 
-/**
- * scsi_put_command - Free a scsi command block
- * @cmd: command block to free
- *
- * Returns:	Nothing.
- *
- * Notes:	The command must not belong to any lists.
- */
-void scsi_put_command(struct scsi_cmnd *cmd)
-{
-	scsi_del_cmd_from_list(cmd);
-	BUG_ON(delayed_work_pending(&cmd->abort_work));
-}
-
 #ifdef CONFIG_SCSI_LOGGING
 void scsi_log_send(struct scsi_cmnd *cmd)
 {
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index ae2fa170f6ad..978be1602f71 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -2412,7 +2412,6 @@ scsi_ioctl_reset(struct scsi_device *dev, int __user *arg)
 	wake_up(&shost->host_wait);
 	scsi_run_host_queues(shost);
 
-	scsi_put_command(scmd);
 	kfree(rq);
 
 out_put_autopm_host:
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index dc210b9d4896..6b957531aaf0 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -565,7 +565,6 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
 {
 	scsi_mq_free_sgtables(cmd);
 	scsi_uninit_cmd(cmd);
-	scsi_del_cmd_from_list(cmd);
 }
 
 /* Returns false when no more bytes to process, true if there are more */
@@ -1101,35 +1100,6 @@ static void scsi_cleanup_rq(struct request *rq)
 	}
 }
 
-/* Add a command to the list used by the aacraid and dpt_i2o drivers */
-void scsi_add_cmd_to_list(struct scsi_cmnd *cmd)
-{
-	struct scsi_device *sdev = cmd->device;
-	struct Scsi_Host *shost = sdev->host;
-	unsigned long flags;
-
-	if (shost->use_cmd_list) {
-		spin_lock_irqsave(&sdev->list_lock, flags);
-		list_add_tail(&cmd->list, &sdev->cmd_list);
-		spin_unlock_irqrestore(&sdev->list_lock, flags);
-	}
-}
-
-/* Remove a command from the list used by the aacraid and dpt_i2o drivers */
-void scsi_del_cmd_from_list(struct scsi_cmnd *cmd)
-{
-	struct scsi_device *sdev = cmd->device;
-	struct Scsi_Host *shost = sdev->host;
-	unsigned long flags;
-
-	if (shost->use_cmd_list) {
-		spin_lock_irqsave(&sdev->list_lock, flags);
-		BUG_ON(list_empty(&cmd->list));
-		list_del_init(&cmd->list);
-		spin_unlock_irqrestore(&sdev->list_lock, flags);
-	}
-}
-
 /* Called after a request has been started. */
 void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
 {
@@ -1158,8 +1128,6 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
 	INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
 	cmd->jiffies_at_alloc = jiffies_at_alloc;
 	cmd->retries = retries;
-
-	scsi_add_cmd_to_list(cmd);
 }
 
 static blk_status_t scsi_setup_scsi_cmnd(struct scsi_device *sdev,
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index cc2859d76d81..88b6ef2cc94d 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -84,8 +84,6 @@ int scsi_eh_get_sense(struct list_head *work_q,
 int scsi_noretry_cmd(struct scsi_cmnd *scmd);
 
 /* scsi_lib.c */
-extern void scsi_add_cmd_to_list(struct scsi_cmnd *cmd);
-extern void scsi_del_cmd_from_list(struct scsi_cmnd *cmd);
 extern int scsi_maybe_unblock_host(struct scsi_device *sdev);
 extern void scsi_device_unbusy(struct scsi_device *sdev);
 extern void scsi_queue_insert(struct scsi_cmnd *cmd, int reason);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 058079f915f1..f2437a7570ce 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -236,7 +236,6 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
 	sdev->sdev_state = SDEV_CREATED;
 	INIT_LIST_HEAD(&sdev->siblings);
 	INIT_LIST_HEAD(&sdev->same_target_siblings);
-	INIT_LIST_HEAD(&sdev->cmd_list);
 	INIT_LIST_HEAD(&sdev->starved_entry);
 	INIT_LIST_HEAD(&sdev->event_list);
 	spin_lock_init(&sdev->list_lock);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 91bd749a02f7..134686e27005 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -158,7 +158,6 @@ static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
 	return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
 }
 
-extern void scsi_put_command(struct scsi_cmnd *);
 extern void scsi_finish_command(struct scsi_cmnd *cmd);
 
 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 3ed836db5306..fd2aee1f59fc 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -110,7 +110,6 @@ struct scsi_device {
 	atomic_t device_blocked;	/* Device returned QUEUE_FULL. */
 
 	spinlock_t list_lock;
-	struct list_head cmd_list;	/* queue of in use SCSI Command structures */
 	struct list_head starved_entry;
 	unsigned short queue_depth;	/* How deep of a queue we want */
 	unsigned short max_queue_depth;	/* max queue depth */
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 2c3f0c58869b..6459ca7969bb 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -641,8 +641,6 @@ struct Scsi_Host {
 	/* The controller does not support WRITE SAME */
 	unsigned no_write_same:1;
 
-	unsigned use_cmd_list:1;
-
 	/* Host responded with short (<36 bytes) INQUIRY result */
 	unsigned short_inquiry:1;
 
-- 
2.16.4

Re: [PATCH 4/4] scsi: Remove cmd_list functionality

[Bart Van Assche]

On 11/1/19 4:18 AM, Hannes Reinecke wrote:
> Remove cmd_list functionality; no users left.
> With that the scsi_put_command() becomes empty,
> so remove that one, too.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH 3/4] aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands

[Bart Van Assche]

On 11/1/19 4:18 AM, Hannes Reinecke wrote:
> +static bool synchronize_busy_iter(struct request *req, void *data, bool reserved)
> +{
> +	struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
> +	struct synchronize_busy_data *busy_data = data;
> +
> +	if (busy_data->sdev == cmd->device &&
> +	    cmd->SCp.phase == AAC_OWNER_FIRMWARE) {
> +		u64 cmnd_lba;
> +		u32 cmnd_count;
> +
> +		if (cmd->cmnd[0] == WRITE_6) {
> +			cmnd_lba = ((cmd->cmnd[1] & 0x1F) << 16) |
> +				(cmd->cmnd[2] << 8) |
> +				cmd->cmnd[3];
> +			cmnd_count = cmd->cmnd[4];
> +			if (cmnd_count == 0)
> +				cmnd_count = 256;
> +		} else if (cmd->cmnd[0] == WRITE_16) {
> +			cmnd_lba = ((u64)cmd->cmnd[2] << 56) |
> +				((u64)cmd->cmnd[3] << 48) |
> +				((u64)cmd->cmnd[4] << 40) |
> +				((u64)cmd->cmnd[5] << 32) |
> +				((u64)cmd->cmnd[6] << 24) |
> +				(cmd->cmnd[7] << 16) |
> +				(cmd->cmnd[8] << 8) |
> +				cmd->cmnd[9];
> +			cmnd_count = (cmd->cmnd[10] << 24) |
> +				(cmd->cmnd[11] << 16) |
> +				(cmd->cmnd[12] << 8) |
> +				cmd->cmnd[13];
> +		} else if (cmd->cmnd[0] == WRITE_12) {
> +			cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
> +				(cmd->cmnd[3] << 16) |
> +				(cmd->cmnd[4] << 8) |
> +				cmd->cmnd[5];
> +			cmnd_count = (cmd->cmnd[6] << 24) |
> +				(cmd->cmnd[7] << 16) |
> +				(cmd->cmnd[8] << 8) |
> +				cmd->cmnd[9];
> +		} else if (cmd->cmnd[0] == WRITE_10) {
> +			cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
> +				(cmd->cmnd[3] << 16) |
> +				(cmd->cmnd[4] << 8) |
> +				cmd->cmnd[5];
> +			cmnd_count = (cmd->cmnd[7] << 8) |
> +				cmd->cmnd[8];
> +		} else
> +			return true;

The above code looks very similar to the code in scsi_trace.c. Although 
SCSI LLDs shouldn't parse CDBs, there are a few SCSI LLDs that do this. 
Would it be worth it to introduce a function in the SCSI core that 
extracts the most important fields from a CDB (LBA, data buffer size, ...)?

Bart.

Re: [PATCH 3/4] aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands

[Hannes Reinecke]

On 11/1/19 4:34 PM, Bart Van Assche wrote:
> On 11/1/19 4:18 AM, Hannes Reinecke wrote:
>> +static bool synchronize_busy_iter(struct request *req, void *data, 
>> bool reserved)
>> +{
>> +    struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
>> +    struct synchronize_busy_data *busy_data = data;
>> +
>> +    if (busy_data->sdev == cmd->device &&
>> +        cmd->SCp.phase == AAC_OWNER_FIRMWARE) {
>> +        u64 cmnd_lba;
>> +        u32 cmnd_count;
>> +
>> +        if (cmd->cmnd[0] == WRITE_6) {
>> +            cmnd_lba = ((cmd->cmnd[1] & 0x1F) << 16) |
>> +                (cmd->cmnd[2] << 8) |
>> +                cmd->cmnd[3];
>> +            cmnd_count = cmd->cmnd[4];
>> +            if (cmnd_count == 0)
>> +                cmnd_count = 256;
>> +        } else if (cmd->cmnd[0] == WRITE_16) {
>> +            cmnd_lba = ((u64)cmd->cmnd[2] << 56) |
>> +                ((u64)cmd->cmnd[3] << 48) |
>> +                ((u64)cmd->cmnd[4] << 40) |
>> +                ((u64)cmd->cmnd[5] << 32) |
>> +                ((u64)cmd->cmnd[6] << 24) |
>> +                (cmd->cmnd[7] << 16) |
>> +                (cmd->cmnd[8] << 8) |
>> +                cmd->cmnd[9];
>> +            cmnd_count = (cmd->cmnd[10] << 24) |
>> +                (cmd->cmnd[11] << 16) |
>> +                (cmd->cmnd[12] << 8) |
>> +                cmd->cmnd[13];
>> +        } else if (cmd->cmnd[0] == WRITE_12) {
>> +            cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
>> +                (cmd->cmnd[3] << 16) |
>> +                (cmd->cmnd[4] << 8) |
>> +                cmd->cmnd[5];
>> +            cmnd_count = (cmd->cmnd[6] << 24) |
>> +                (cmd->cmnd[7] << 16) |
>> +                (cmd->cmnd[8] << 8) |
>> +                cmd->cmnd[9];
>> +        } else if (cmd->cmnd[0] == WRITE_10) {
>> +            cmnd_lba = ((u64)cmd->cmnd[2] << 24) |
>> +                (cmd->cmnd[3] << 16) |
>> +                (cmd->cmnd[4] << 8) |
>> +                cmd->cmnd[5];
>> +            cmnd_count = (cmd->cmnd[7] << 8) |
>> +                cmd->cmnd[8];
>> +        } else
>> +            return true;
> 
> The above code looks very similar to the code in scsi_trace.c. Although 
> SCSI LLDs shouldn't parse CDBs, there are a few SCSI LLDs that do this. 
> Would it be worth it to introduce a function in the SCSI core that 
> extracts the most important fields from a CDB (LBA, data buffer size, ...)?
> 
Possibly.
I'll see what I can come up with.

But in either case I'd rather do this as a separate patchset.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@suse.de                              +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)

Re: [PATCH 3/4] aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands

[kbuild test robot]

Hi Hannes,

I love your patch! Perhaps something to improve:

[auto build test WARNING on mkp-scsi/for-next]
[also build test WARNING on next-20191031]
[cannot apply to v5.4-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Hannes-Reinecke/scsi-remove-legacy-cmd_list-implementation/20191102-214752
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


coccinelle warnings: (new ones prefixed by >>)

>> drivers/scsi/aacraid/aachba.c:2699:15-16: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[PATCH] aacraid: fix semicolon.cocci warnings

[kbuild test robot]

From: kbuild test robot <lkp@intel.com>

drivers/scsi/aacraid/aachba.c:2699:15-16: Unneeded semicolon


 Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Fixes: 73021c7fb117 ("aacraid: use blk_mq_rq_busy_iter() for traversing outstanding commands")
CC: Hannes Reinecke <hare@suse.de>
Signed-off-by: kbuild test robot <lkp@intel.com>
---

url:    https://github.com/0day-ci/linux/commits/Hannes-Reinecke/scsi-remove-legacy-cmd_list-implementation/20191102-214752
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next

 aachba.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2696,7 +2696,7 @@ static bool synchronize_busy_iter(struct
 			return true;
 		if (((cmnd_lba + cmnd_count) < busy_data->lba) ||
 		    (busy_data->count && ((busy_data->lba + busy_data->count) < cmnd_lba)))
-			return true;;
+			return true;
 		++busy_data->active;
 	}
 	return true;