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aha1542: rework locking 

Remove aha1542_lock and use host_lock instead.
Remove interrupt and queuecommand function wrappers.
Remove locking from lowlevel _out and _in functions, they now can
onle be called (at runtime) with host_lock being held.
Remove ssleep(4) in aha1542_reset as we can't sleep while holding a spinlock.
It's useless anyway as wait_mask will wait until the controller is idle and
kernel waits for 10 seconds (HOST_RESET_SETTLE_TIME) after that.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Ondrej Zary 2015-02-06 23:11:55 +01:00 committed by James Bottomley
parent 764a0c7e84
commit 1b0224b0ec
1 changed files with 34 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
drivers/scsi/aha1542.c
View File

@ -62,8 +62,6 @@ struct aha1542_hostdata {
struct ccb ccb[AHA1542_MAILBOXES];
};
static DEFINE_SPINLOCK(aha1542_lock);
static inline void aha1542_intr_reset(u16 base)
{
outb(IRST, CONTROL(base));
@ -91,41 +89,25 @@ static inline bool wait_mask(u16 port, u8 mask, u8 allof, u8 noneof, int timeout
return true;
}
/* This is a bit complicated, but we need to make sure that an interrupt
routine does not send something out while we are in the middle of this.
Fortunately, it is only at boot time that multi-byte messages
are ever sent. */
static int aha1542_outb(unsigned int base, u8 val)
{
unsigned long flags;
while (1) {
if (!wait_mask(STATUS(base), CDF, 0, CDF, 0))
return 1;
spin_lock_irqsave(&aha1542_lock, flags);
if (inb(STATUS(base)) & CDF) {
spin_unlock_irqrestore(&aha1542_lock, flags);
if (inb(STATUS(base)) & CDF)
continue;
}
outb(val, DATA(base));
spin_unlock_irqrestore(&aha1542_lock, flags);
return 0;
}
}
static int aha1542_out(unsigned int base, u8 *buf, int len)
{
unsigned long flags;
spin_lock_irqsave(&aha1542_lock, flags);
while (len--) {
if (!wait_mask(STATUS(base), CDF, 0, CDF, 0)) {
spin_unlock_irqrestore(&aha1542_lock, flags);
if (!wait_mask(STATUS(base), CDF, 0, CDF, 0))
return 1;
}
outb(*buf++, DATA(base));
}
spin_unlock_irqrestore(&aha1542_lock, flags);
if (!wait_mask(INTRFLAGS(base), INTRMASK, HACC, 0, 0))
return 1;
@ -137,17 +119,11 @@ static int aha1542_out(unsigned int base, u8 *buf, int len)
static int aha1542_in(unsigned int base, u8 *buf, int len, int timeout)
{
unsigned long flags;
spin_lock_irqsave(&aha1542_lock, flags);
while (len--) {
if (!wait_mask(STATUS(base), DF, DF, 0, timeout)) {
spin_unlock_irqrestore(&aha1542_lock, flags);
if (!wait_mask(STATUS(base), DF, DF, 0, timeout))
return 1;
}
*buf++ = inb(DATA(base));
}
spin_unlock_irqrestore(&aha1542_lock, flags);
return 0;
}
@ -260,9 +236,9 @@ static int aha1542_test_port(struct Scsi_Host *sh)
return 1;
}
/* A "high" level interrupt handler */
static void aha1542_intr_handle(struct Scsi_Host *sh)
static irqreturn_t aha1542_interrupt(int irq, void *dev_id)
{
struct Scsi_Host *sh = dev_id;
struct aha1542_hostdata *aha1542 = shost_priv(sh);
void (*my_done)(struct scsi_cmnd *) = NULL;
int errstatus, mbi, mbo, mbistatus;
@ -292,7 +268,8 @@ static void aha1542_intr_handle(struct Scsi_Host *sh)
#endif
number_serviced = 0;
while (1 == 1) {
spin_lock_irqsave(sh->host_lock, flags);
while (1) {
flag = inb(INTRFLAGS(sh->io_port));
/* Check for unusual interrupts. If any of these happen, we should
@ -309,7 +286,6 @@ static void aha1542_intr_handle(struct Scsi_Host *sh)
}
aha1542_intr_reset(sh->io_port);
spin_lock_irqsave(&aha1542_lock, flags);
mbi = aha1542->aha1542_last_mbi_used + 1;
if (mbi >= 2 * AHA1542_MAILBOXES)
mbi = AHA1542_MAILBOXES;
@ -323,18 +299,17 @@ static void aha1542_intr_handle(struct Scsi_Host *sh)
} while (mbi != aha1542->aha1542_last_mbi_used);
if (mb[mbi].status == 0) {
spin_unlock_irqrestore(&aha1542_lock, flags);
spin_unlock_irqrestore(sh->host_lock, flags);
/* Hmm, no mail. Must have read it the last time around */
if (!number_serviced)
shost_printk(KERN_WARNING, sh, "interrupt received, but no mail.\n");
return;
return IRQ_HANDLED;
};
mbo = (scsi2int(mb[mbi].ccbptr) - (isa_virt_to_bus(&ccb[0]))) / sizeof(struct ccb);
mbistatus = mb[mbi].status;
mb[mbi].status = 0;
aha1542->aha1542_last_mbi_used = mbi;
spin_unlock_irqrestore(&aha1542_lock, flags);
#ifdef DEBUG
if (ccb[mbo].tarstat | ccb[mbo].hastat)
@ -352,10 +327,11 @@ static void aha1542_intr_handle(struct Scsi_Host *sh)
tmp_cmd = aha1542->int_cmds[mbo];
if (!tmp_cmd || !tmp_cmd->scsi_done) {
spin_unlock_irqrestore(sh->host_lock, flags);
shost_printk(KERN_WARNING, sh, "Unexpected interrupt\n");
shost_printk(KERN_WARNING, sh, "tarstat=%x, hastat=%x idlun=%x ccb#=%d\n", ccb[mbo].tarstat,
ccb[mbo].hastat, ccb[mbo].idlun, mbo);
return;
return IRQ_HANDLED;
}
my_done = tmp_cmd->scsi_done;
kfree(tmp_cmd->host_scribble);
@ -394,21 +370,8 @@ static void aha1542_intr_handle(struct Scsi_Host *sh)
};
}
/* A quick wrapper for do_aha1542_intr_handle to grab the spin lock */
static irqreturn_t do_aha1542_intr_handle(int dummy, void *dev_id)
static int aha1542_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
unsigned long flags;
struct Scsi_Host *sh = dev_id;
spin_lock_irqsave(sh->host_lock, flags);
aha1542_intr_handle(sh);
spin_unlock_irqrestore(sh->host_lock, flags);
return IRQ_HANDLED;
}
static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct scsi_cmnd *))
{
struct Scsi_Host *sh = cmd->device->host;
struct aha1542_hostdata *aha1542 = shost_priv(sh);
u8 direction;
u8 target = cmd->device->id;
@ -422,7 +385,7 @@ static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct
if (*cmd->cmnd == REQUEST_SENSE) {
/* Don't do the command - we have the sense data already */
cmd->result = 0;
done(cmd);
cmd->scsi_done(cmd);
return 0;
}
#ifdef DEBUG
@ -440,7 +403,7 @@ static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct
/* Use the outgoing mailboxes in a round-robin fashion, because this
is how the host adapter will scan for them */
spin_lock_irqsave(&aha1542_lock, flags);
spin_lock_irqsave(sh->host_lock, flags);
mbo = aha1542->aha1542_last_mbo_used + 1;
if (mbo >= AHA1542_MAILBOXES)
mbo = 0;
@ -460,10 +423,9 @@ static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct
screwing with this cdb. */
aha1542->aha1542_last_mbo_used = mbo;
spin_unlock_irqrestore(&aha1542_lock, flags);
#ifdef DEBUG
shost_printk(KERN_DEBUG, sh, "Sending command (%d %p)...", mbo, done);
shost_printk(KERN_DEBUG, sh, "Sending command (%d %p)...", mbo, cmd->scsi_done);
#endif
any2scsi(mb[mbo].ccbptr, isa_virt_to_bus(&ccb[mbo])); /* This gets trashed for some reason */
@ -492,6 +454,7 @@ static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct
if (cptr == NULL) {
/* free the claimed mailbox slot */
aha1542->int_cmds[mbo] = NULL;
spin_unlock_irqrestore(sh->host_lock, flags);
return SCSI_MLQUEUE_HOST_BUSY;
}
scsi_for_each_sg(cmd, sg, sg_count, i) {
@ -518,23 +481,15 @@ static int aha1542_queuecommand_lck(struct scsi_cmnd *cmd, void (*done) (struct
#ifdef DEBUG
print_hex_dump_bytes("sending: ", DUMP_PREFIX_NONE, &ccb[mbo], sizeof(ccb[mbo]) - 10);
printk("aha1542_queuecommand: now waiting for interrupt ");
#endif
if (done) {
#ifdef DEBUG
printk("aha1542_queuecommand: now waiting for interrupt ");
#endif
cmd->scsi_done = done;
mb[mbo].status = 1;
aha1542_outb(cmd->device->host->io_port, CMD_START_SCSI);
} else
printk("aha1542_queuecommand: done can't be NULL\n");
mb[mbo].status = 1;
aha1542_outb(cmd->device->host->io_port, CMD_START_SCSI);
spin_unlock_irqrestore(sh->host_lock, flags);
return 0;
}
static DEF_SCSI_QCMD(aha1542_queuecommand)
/* Initialize mailboxes */
static void setup_mailboxes(struct Scsi_Host *sh)
{
@ -786,8 +741,7 @@ static struct Scsi_Host *aha1542_hw_init(struct scsi_host_template *tpnt, struct
setup_mailboxes(sh);
if (request_irq(sh->irq, do_aha1542_intr_handle, 0,
"aha1542", sh)) {
if (request_irq(sh->irq, aha1542_interrupt, 0, "aha1542", sh)) {
shost_printk(KERN_ERR, sh, "Unable to allocate IRQ.\n");
goto unregister;
}
@ -841,7 +795,8 @@ static int aha1542_release(struct Scsi_Host *sh)
*/
static int aha1542_dev_reset(struct scsi_cmnd *cmd)
{
struct aha1542_hostdata *aha1542 = shost_priv(cmd->device->host);
struct Scsi_Host *sh = cmd->device->host;
struct aha1542_hostdata *aha1542 = shost_priv(sh);
unsigned long flags;
struct mailbox *mb = aha1542->mb;
u8 target = cmd->device->id;
@ -849,7 +804,7 @@ static int aha1542_dev_reset(struct scsi_cmnd *cmd)
int mbo;
struct ccb *ccb = aha1542->ccb;
spin_lock_irqsave(&aha1542_lock, flags);
spin_lock_irqsave(sh->host_lock, flags);
mbo = aha1542->aha1542_last_mbo_used + 1;
if (mbo >= AHA1542_MAILBOXES)
mbo = 0;
@ -870,7 +825,6 @@ static int aha1542_dev_reset(struct scsi_cmnd *cmd)
screwing with this cdb. */
aha1542->aha1542_last_mbo_used = mbo;
spin_unlock_irqrestore(&aha1542_lock, flags);
any2scsi(mb[mbo].ccbptr, isa_virt_to_bus(&ccb[mbo])); /* This gets trashed for some reason */
@ -887,7 +841,8 @@ static int aha1542_dev_reset(struct scsi_cmnd *cmd)
* Now tell the 1542 to flush all pending commands for this
* target
*/
aha1542_outb(cmd->device->host->io_port, CMD_START_SCSI);
aha1542_outb(sh->io_port, CMD_START_SCSI);
spin_unlock_irqrestore(sh->host_lock, flags);
scmd_printk(KERN_WARNING, cmd,
"Trying device reset for target\n");
@ -897,9 +852,12 @@ static int aha1542_dev_reset(struct scsi_cmnd *cmd)
static int aha1542_reset(struct scsi_cmnd *cmd, u8 reset_cmd)
{
struct aha1542_hostdata *aha1542 = shost_priv(cmd->device->host);
struct Scsi_Host *sh = cmd->device->host;
struct aha1542_hostdata *aha1542 = shost_priv(sh);
unsigned long flags;
int i;
spin_lock_irqsave(sh->host_lock, flags);
/*
* This does a scsi reset for all devices on the bus.
* In principle, we could also reset the 1542 - should
@ -908,27 +866,19 @@ static int aha1542_reset(struct scsi_cmnd *cmd, u8 reset_cmd)
*/
outb(reset_cmd, CONTROL(cmd->device->host->io_port));
/*
* Wait for the thing to settle down a bit. Unfortunately
* this is going to basically lock up the machine while we
* wait for this to complete. To be 100% correct, we need to
* check for timeout, and if we are doing something like this
* we are pretty desperate anyways.
*/
ssleep(4);
spin_lock_irq(cmd->device->host->host_lock);
if (!wait_mask(STATUS(cmd->device->host->io_port),
STATMASK, INIT | IDLE, STST | DIAGF | INVDCMD | DF | CDF, 0)) {
spin_unlock_irq(cmd->device->host->host_lock);
spin_unlock_irqrestore(sh->host_lock, flags);
return FAILED;
}
/*
* We need to do this too before the 1542 can interact with
* us again after host reset.
*/
if (reset_cmd & HRST)
setup_mailboxes(cmd->device->host);
/*
* Now try to pick up the pieces. For all pending commands,
* free any internal data structures, and basically clear things
@ -958,7 +908,7 @@ static int aha1542_reset(struct scsi_cmnd *cmd, u8 reset_cmd)
}
}
spin_unlock_irq(cmd->device->host->host_lock);
spin_unlock_irqrestore(sh->host_lock, flags);
return SUCCESS;
}