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Subject[PATCH 2/8] x86/amd-iommu: Dump illegal command on ILLEGAL_COMMAND_ERROR
Date
This patch adds code to dump the command which caused an
ILLEGAL_COMMAND_ERROR raised by the IOMMU hardware.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 364c6de..e62b35f 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -147,6 +147,15 @@ static void dump_dte_entry(u16 devid)
amd_iommu_dev_table[devid].data[i]);
}

+static void dump_command(unsigned long phys_addr)
+{
+ struct iommu_cmd *cmd = phys_to_virt(phys_addr);
+ int i;
+
+ for (i = 0; i < 4; ++i)
+ pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
+}
+
static void iommu_print_event(void *__evt)
{
u32 *event = __evt;
@@ -186,6 +195,7 @@ static void iommu_print_event(void *__evt)
break;
case EVENT_TYPE_ILL_CMD:
printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
+ dump_command(address);
break;
case EVENT_TYPE_CMD_HARD_ERR:
printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
--
1.6.3.3



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