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>
#define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
#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)
#define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
{\
#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;\
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();\
}\
panic("DMAR hardware is malfunctioning\n");\
cpu_relax();\
}\