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scsi: wd719x: use per-command private data

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Add the SCB onto the scsi command allocation and use dma streaming mappings
for it only when in use.  This avoid possibly calling dma_alloc_coherent
under a lock or even in irq context, while also making the code simpler.

Thanks to Ondrej Zary for testing and various bug fixes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-11-09 16:54:05 +01:00 committed by Martin K. Petersen
parent d9c30dbca7
commit fde46e9682
2 changed files with 42 additions and 57 deletions
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98
drivers/scsi/wd719x.c
View File

@ -153,8 +153,6 @@ static int wd719x_direct_cmd(struct wd719x *wd, u8 opcode, u8 dev, u8 lun,
static void wd719x_destroy(struct wd719x *wd)
{
struct wd719x_scb *scb;
/* stop the RISC */
if (wd719x_direct_cmd(wd, WD719X_CMD_SLEEP, 0, 0, 0, 0,
WD719X_WAIT_FOR_RISC))
@ -164,10 +162,6 @@ static void wd719x_destroy(struct wd719x *wd)
WARN_ON_ONCE(!list_empty(&wd->active_scbs));
/* free all SCBs */
list_for_each_entry(scb, &wd->free_scbs, list)
pci_free_consistent(wd->pdev, sizeof(struct wd719x_scb), scb,
scb->phys);
/* free internal buffers */
pci_free_consistent(wd->pdev, wd->fw_size, wd->fw_virt, wd->fw_phys);
wd->fw_virt = NULL;
@ -180,18 +174,20 @@ static void wd719x_destroy(struct wd719x *wd)
free_irq(wd->pdev->irq, wd);
}
/* finish a SCSI command, mark SCB (if any) as free, unmap buffers */
static void wd719x_finish_cmd(struct scsi_cmnd *cmd, int result)
/* finish a SCSI command, unmap buffers */
static void wd719x_finish_cmd(struct wd719x_scb *scb, int result)
{
struct scsi_cmnd *cmd = scb->cmd;
struct wd719x *wd = shost_priv(cmd->device->host);
struct wd719x_scb *scb = (struct wd719x_scb *) cmd->host_scribble;
if (scb) {
list_move(&scb->list, &wd->free_scbs);
dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
scsi_dma_unmap(cmd);
}
list_del(&scb->list);
dma_unmap_single(&wd->pdev->dev, scb->phys,
sizeof(struct wd719x_scb), DMA_BIDIRECTIONAL);
scsi_dma_unmap(cmd);
dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
cmd->result = result << 16;
cmd->scsi_done(cmd);
}
@ -201,36 +197,10 @@ static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
int i, count_sg;
unsigned long flags;
struct wd719x_scb *scb;
struct wd719x_scb *scb = scsi_cmd_priv(cmd);
struct wd719x *wd = shost_priv(sh);
dma_addr_t phys;
cmd->host_scribble = NULL;
/* get a free SCB - either from existing ones or allocate a new one */
spin_lock_irqsave(wd->sh->host_lock, flags);
scb = list_first_entry_or_null(&wd->free_scbs, struct wd719x_scb, list);
if (scb) {
list_del(&scb->list);
phys = scb->phys;
} else {
spin_unlock_irqrestore(wd->sh->host_lock, flags);
scb = pci_alloc_consistent(wd->pdev, sizeof(struct wd719x_scb),
&phys);
spin_lock_irqsave(wd->sh->host_lock, flags);
if (!scb) {
dev_err(&wd->pdev->dev, "unable to allocate SCB\n");
wd719x_finish_cmd(cmd, DID_ERROR);
spin_unlock_irqrestore(wd->sh->host_lock, flags);
return 0;
}
}
memset(scb, 0, sizeof(struct wd719x_scb));
list_add(&scb->list, &wd->active_scbs);
scb->phys = phys;
scb->cmd = cmd;
cmd->host_scribble = (char *) scb;
scb->CDB_tag = 0; /* Tagged queueing not supported yet */
scb->devid = cmd->device->id;
@ -239,10 +209,19 @@ static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
/* copy the command */
memcpy(scb->CDB, cmd->cmnd, cmd->cmd_len);
/* map SCB */
scb->phys = dma_map_single(&wd->pdev->dev, scb, sizeof(*scb),
DMA_BIDIRECTIONAL);
if (dma_mapping_error(&wd->pdev->dev, scb->phys))
goto out_error;
/* map sense buffer */
scb->sense_buf_length = SCSI_SENSE_BUFFERSIZE;
cmd->SCp.dma_handle = dma_map_single(&wd->pdev->dev, cmd->sense_buffer,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(&wd->pdev->dev, cmd->SCp.dma_handle))
goto out_unmap_scb;
scb->sense_buf = cpu_to_le32(cmd->SCp.dma_handle);
/* request autosense */
@ -257,11 +236,8 @@ static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
/* Scather/gather */
count_sg = scsi_dma_map(cmd);
if (count_sg < 0) {
wd719x_finish_cmd(cmd, DID_ERROR);
spin_unlock_irqrestore(wd->sh->host_lock, flags);
return 0;
}
if (count_sg < 0)
goto out_unmap_sense;
BUG_ON(count_sg > WD719X_SG);
if (count_sg) {
@ -282,19 +258,33 @@ static int wd719x_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
scb->data_p = 0;
}
spin_lock_irqsave(wd->sh->host_lock, flags);
/* check if the Command register is free */
if (wd719x_readb(wd, WD719X_AMR_COMMAND) != WD719X_CMD_READY) {
spin_unlock_irqrestore(wd->sh->host_lock, flags);
return SCSI_MLQUEUE_HOST_BUSY;
}
list_add(&scb->list, &wd->active_scbs);
/* write pointer to the AMR */
wd719x_writel(wd, WD719X_AMR_SCB_IN, scb->phys);
/* send SCB opcode */
wd719x_writeb(wd, WD719X_AMR_COMMAND, WD719X_CMD_PROCESS_SCB);
spin_unlock_irqrestore(wd->sh->host_lock, flags);
return 0;
out_unmap_sense:
dma_unmap_single(&wd->pdev->dev, cmd->SCp.dma_handle,
SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
out_unmap_scb:
dma_unmap_single(&wd->pdev->dev, scb->phys, sizeof(*scb),
DMA_BIDIRECTIONAL);
out_error:
cmd->result = DID_ERROR << 16;
cmd->scsi_done(cmd);
return 0;
}
@ -463,7 +453,7 @@ static int wd719x_abort(struct scsi_cmnd *cmd)
{
int action, result;
unsigned long flags;
struct wd719x_scb *scb = (struct wd719x_scb *)cmd->host_scribble;
struct wd719x_scb *scb = scsi_cmd_priv(cmd);
struct wd719x *wd = shost_priv(cmd->device->host);
dev_info(&wd->pdev->dev, "abort command, tag: %x\n", cmd->tag);
@ -525,10 +515,8 @@ static int wd719x_host_reset(struct scsi_cmnd *cmd)
result = FAILED;
/* flush all SCBs */
list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list) {
struct scsi_cmnd *tmp_cmd = scb->cmd;
wd719x_finish_cmd(tmp_cmd, result);
}
list_for_each_entry_safe(scb, tmp, &wd->active_scbs, list)
wd719x_finish_cmd(scb, result);
spin_unlock_irqrestore(wd->sh->host_lock, flags);
return result;
@ -554,7 +542,6 @@ static inline void wd719x_interrupt_SCB(struct wd719x *wd,
union wd719x_regs regs,
struct wd719x_scb *scb)
{
struct scsi_cmnd *cmd;
int result;
/* now have to find result from card */
@ -642,9 +629,8 @@ static inline void wd719x_interrupt_SCB(struct wd719x *wd,
result = DID_ERROR;
break;
}
cmd = scb->cmd;
wd719x_finish_cmd(cmd, result);
wd719x_finish_cmd(scb, result);
}
static irqreturn_t wd719x_interrupt(int irq, void *dev_id)
@ -808,7 +794,6 @@ static int wd719x_board_found(struct Scsi_Host *sh)
int ret;
INIT_LIST_HEAD(&wd->active_scbs);
INIT_LIST_HEAD(&wd->free_scbs);
sh->base = pci_resource_start(wd->pdev, 0);
@ -873,6 +858,7 @@ static int wd719x_board_found(struct Scsi_Host *sh)
static struct scsi_host_template wd719x_template = {
.module = THIS_MODULE,
.name = "Western Digital 719x",
.cmd_size = sizeof(struct wd719x_scb),
.queuecommand = wd719x_queuecommand,
.eh_abort_handler = wd719x_abort,
.eh_device_reset_handler = wd719x_dev_reset,

1
drivers/scsi/wd719x.h
View File

@ -74,7 +74,6 @@ struct wd719x {
void *hash_virt; /* hash table CPU address */
dma_addr_t hash_phys; /* hash table bus address */
struct list_head active_scbs;
struct list_head free_scbs;
};
/* timeout delays in microsecs */