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IB/ipath: prevent hardware from being accessed during reset

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The reset code now turns off the PRESENT flag during a reset, so that
other code won't attempt to access a device that's in mid-reset.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Bryan O'Sullivan 2006-04-24 14:23:03 -07:00 committed by Roland Dreier
parent fccea66364
commit c71c30dcba
3 changed files with 23 additions and 6 deletions
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15
drivers/infiniband/hw/ipath/ipath_intr.c
View file

@ -719,11 +719,24 @@ static void handle_rcv(struct ipath_devdata *dd, u32 istat)
irqreturn_t ipath_intr(int irq, void *data, struct pt_regs *regs)
{
struct ipath_devdata *dd = data;
u32 istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
u32 istat;
ipath_err_t estat = 0;
static unsigned unexpected = 0;
irqreturn_t ret;
if(!(dd->ipath_flags & IPATH_PRESENT)) {
/* this is mostly so we don't try to touch the chip while
* it is being reset */
/*
* This return value is perhaps odd, but we do not want the
* interrupt core code to remove our interrupt handler
* because we don't appear to be handling an interrupt
* during a chip reset.
*/
return IRQ_HANDLED;
}
istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
if (unlikely(!istat)) {
ipath_stats.sps_nullintr++;
ret = IRQ_NONE; /* not our interrupt, or already handled */

10
drivers/infiniband/hw/ipath/ipath_kernel.h
View file

@ -731,7 +731,7 @@ u64 ipath_read_kreg64_port(const struct ipath_devdata *, ipath_kreg,
static inline u32 ipath_read_ureg32(const struct ipath_devdata *dd,
ipath_ureg regno, int port)
{
if (!dd->ipath_kregbase)
if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT))
return 0;
return readl(regno + (u64 __iomem *)
@ -762,7 +762,7 @@ static inline void ipath_write_ureg(const struct ipath_devdata *dd,
static inline u32 ipath_read_kreg32(const struct ipath_devdata *dd,
ipath_kreg regno)
{
if (!dd->ipath_kregbase)
if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT))
return -1;
return readl((u32 __iomem *) & dd->ipath_kregbase[regno]);
}
@ -770,7 +770,7 @@ static inline u32 ipath_read_kreg32(const struct ipath_devdata *dd,
static inline u64 ipath_read_kreg64(const struct ipath_devdata *dd,
ipath_kreg regno)
{
if (!dd->ipath_kregbase)
if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT))
return -1;
return readq(&dd->ipath_kregbase[regno]);
@ -786,7 +786,7 @@ static inline void ipath_write_kreg(const struct ipath_devdata *dd,
static inline u64 ipath_read_creg(const struct ipath_devdata *dd,
ipath_sreg regno)
{
if (!dd->ipath_kregbase)
if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT))
return 0;
return readq(regno + (u64 __iomem *)
@ -797,7 +797,7 @@ static inline u64 ipath_read_creg(const struct ipath_devdata *dd,
static inline u32 ipath_read_creg32(const struct ipath_devdata *dd,
ipath_sreg regno)
{
if (!dd->ipath_kregbase)
if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT))
return 0;
return readl(regno + (u64 __iomem *)
(dd->ipath_cregbase +

4
drivers/infiniband/hw/ipath/ipath_pe800.c
View file

@ -972,6 +972,8 @@ static int ipath_setup_pe_reset(struct ipath_devdata *dd)
/* Use ERROR so it shows up in logs, etc. */
ipath_dev_err(dd, "Resetting PE-800 unit %u\n",
dd->ipath_unit);
/* keep chip from being accessed in a few places */
dd->ipath_flags &= ~(IPATH_INITTED|IPATH_PRESENT);
val = dd->ipath_control | INFINIPATH_C_RESET;
ipath_write_kreg(dd, dd->ipath_kregs->kr_control, val);
mb();
@ -997,6 +999,8 @@ static int ipath_setup_pe_reset(struct ipath_devdata *dd)
if ((r = pci_enable_device(dd->pcidev)))
ipath_dev_err(dd, "pci_enable_device failed after "
"reset: %d\n", r);
/* whether it worked or not, mark as present, again */
dd->ipath_flags |= IPATH_PRESENT;
val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
if (val == dd->ipath_revision) {
ipath_cdbg(VERBOSE, "Got matching revision "