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PCI: Make the intel-iommu_wait_op macro work when jiffies are not running 

The following patch changes the intel-iommu.c code to use the TSC
instead of jiffies for detecting bad DMAR functionality.  Some systems
with bad bios's have been seen to hang in early boot spinning in the
IOMMU_WAIT_IO macro.  This patch will replace the infinite loop with a call to
panic.

Signed-off-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
wifi-calibration
mark gross 2008-05-12 13:41:57 -07:00 committed by Jesse Barnes
parent 34a65055e5
commit a7eb08c2a1
1 changed files with 3 additions and 3 deletions
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6
drivers/pci/intel-iommu.c
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@ -49,7 +49,7 @@
#define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
#define DMAR_OPERATION_TIMEOUT (HZ*60) /* 1m */
#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) /* 10sec */
#define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
@ -490,12 +490,12 @@ static int iommu_alloc_root_entry(struct intel_iommu *iommu)
#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
{\
unsigned long start_time = jiffies;\
cycles_t start_time = get_cycles();\
while (1) {\
sts = op (iommu->reg + offset);\
if (cond)\
break;\
if (time_after(jiffies, start_time + DMAR_OPERATION_TIMEOUT))\
if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
panic("DMAR hardware is malfunctioning\n");\
cpu_relax();\
}\