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Subject[PATCH 6/8] x86/amd-iommu: Reset command buffer on ILLEGAL_COMMAND_ERROR
Date
On an ILLEGAL_COMMAND_ERROR the IOMMU stops executing
further commands. This patch changes the code to handle this
case better by resetting the command buffer in the IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 2dc0933..2333d61 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -61,6 +61,7 @@ static u64* alloc_pte(struct protection_domain *dom,
static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
unsigned long start_page,
unsigned int pages);
+static void reset_iommu_command_buffer(struct amd_iommu *iommu);

#ifndef BUS_NOTIFY_UNBOUND_DRIVER
#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
@@ -156,7 +157,7 @@ static void dump_command(unsigned long phys_addr)
pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
}

-static void iommu_print_event(void *__evt)
+static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
{
u32 *event = __evt;
int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
@@ -195,6 +196,7 @@ static void iommu_print_event(void *__evt)
break;
case EVENT_TYPE_ILL_CMD:
printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
+ reset_iommu_command_buffer(iommu);
dump_command(address);
break;
case EVENT_TYPE_CMD_HARD_ERR:
@@ -229,7 +231,7 @@ static void iommu_poll_events(struct amd_iommu *iommu)
tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);

while (head != tail) {
- iommu_print_event(iommu->evt_buf + head);
+ iommu_print_event(iommu, iommu->evt_buf + head);
head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
}

@@ -547,6 +549,15 @@ void amd_iommu_flush_all_devices(void)
}
}

+static void reset_iommu_command_buffer(struct amd_iommu *iommu)
+{
+ pr_err("AMD-Vi: Resetting IOMMU command buffer\n");
+
+ amd_iommu_reset_cmd_buffer(iommu);
+ flush_all_devices_for_iommu(iommu);
+ flush_all_domains_on_iommu(iommu);
+}
+
/****************************************************************************
*
* The functions below are used the create the page table mappings for
--
1.6.3.3



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