x86/amd-iommu: Remove command buffer resetting logic
The logic to reset the command buffer caused more problems
than it actually helped. The logic jumped in when the IOMMU
hardware doesn't execute commands anymore but the reasons
for this are usually not fixed by just resetting the command
buffer. So the code can be removed to reduce complexity.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index e3509fc..878ae00 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -409,9 +409,6 @@
/* if one, we need to send a completion wait command */
bool need_sync;
- /* becomes true if a command buffer reset is running */
- bool reset_in_progress;
-
/* default dma_ops domain for that IOMMU */
struct dma_ops_domain *default_dom;
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 073c64b..0147c5c 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -58,7 +58,6 @@
u32 data[4];
};
-static void reset_iommu_command_buffer(struct amd_iommu *iommu);
static void update_domain(struct protection_domain *domain);
/****************************************************************************
@@ -323,8 +322,6 @@
break;
case EVENT_TYPE_ILL_CMD:
printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
- iommu->reset_in_progress = true;
- reset_iommu_command_buffer(iommu);
dump_command(address);
break;
case EVENT_TYPE_CMD_HARD_ERR:
@@ -485,8 +482,7 @@
if (i == LOOP_TIMEOUT) {
pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
- iommu->reset_in_progress = true;
- reset_iommu_command_buffer(iommu);
+ ret = -EIO;
}
return 0;
@@ -628,20 +624,6 @@
spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
}
-static void reset_iommu_command_buffer(struct amd_iommu *iommu)
-{
- pr_err("AMD-Vi: Resetting IOMMU command buffer\n");
-
- if (iommu->reset_in_progress)
- panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n");
-
- amd_iommu_reset_cmd_buffer(iommu);
- amd_iommu_flush_all_devices();
- amd_iommu_flush_all_domains();
-
- iommu->reset_in_progress = false;
-}
-
/****************************************************************************
*
* The functions below are used the create the page table mappings for