Commit f2dd8717 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

iommu/vt-d: Add qi_submit trace event 



This adds a new trace event to track the submissions of requests to the
invalidation queue. This event will provide the information like:
- IOMMU name
- Invalidation type
- Descriptor raw data

A sample output like:
| qi_submit: iotlb_inv dmar1: 0x100e2 0x0 0x0 0x0
| qi_submit: dev_tlb_inv dmar1: 0x1000000003 0x7ffffffffffff001 0x0 0x0
| qi_submit: iotlb_inv dmar2: 0x800f2 0xf9a00005 0x0 0x0

This will be helpful for queued invalidation related debugging.

Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210114090400.736104-1-baolu.lu@linux.intel.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 9872f9bd

drivers/iommu/intel/dmar.c

+3 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/limits.h>

#include <asm/irq_remapping.h>

#include <asm/iommu_table.h>

#include <trace/events/intel_iommu.h>



#include "../irq_remapping.h"
@@ -1307,6 +1308,8 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc, 
		offset = ((index + i) % QI_LENGTH) << shift;

		memcpy(qi->desc + offset, &desc[i], 1 << shift);

		qi->desc_status[(index + i) % QI_LENGTH] = QI_IN_USE;

		trace_qi_submit(iommu, desc[i].qw0, desc[i].qw1,

				desc[i].qw2, desc[i].qw3);

	}

	qi->desc_status[wait_index] = QI_IN_USE;

include/trace/events/intel_iommu.h

+37 −0
Original line number Diff line number Diff line
@@ -135,6 +135,43 @@ DEFINE_EVENT(dma_map_sg, bounce_map_sg, 
		 struct scatterlist *sg),

	TP_ARGS(dev, index, total, sg)

);



TRACE_EVENT(qi_submit,

	TP_PROTO(struct intel_iommu *iommu, u64 qw0, u64 qw1, u64 qw2, u64 qw3),



	TP_ARGS(iommu, qw0, qw1, qw2, qw3),



	TP_STRUCT__entry(

		__field(u64, qw0)

		__field(u64, qw1)

		__field(u64, qw2)

		__field(u64, qw3)

		__string(iommu, iommu->name)

	),



	TP_fast_assign(

		__assign_str(iommu, iommu->name);

		__entry->qw0 = qw0;

		__entry->qw1 = qw1;

		__entry->qw2 = qw2;

		__entry->qw3 = qw3;

	),



	TP_printk("%s %s: 0x%llx 0x%llx 0x%llx 0x%llx",

		  __print_symbolic(__entry->qw0 & 0xf,

				   { QI_CC_TYPE,	"cc_inv" },

				   { QI_IOTLB_TYPE,	"iotlb_inv" },

				   { QI_DIOTLB_TYPE,	"dev_tlb_inv" },

				   { QI_IEC_TYPE,	"iec_inv" },

				   { QI_IWD_TYPE,	"inv_wait" },

				   { QI_EIOTLB_TYPE,	"p_iotlb_inv" },

				   { QI_PC_TYPE,	"pc_inv" },

				   { QI_DEIOTLB_TYPE,	"p_dev_tlb_inv" },

				   { QI_PGRP_RESP_TYPE,	"page_grp_resp" }),

		__get_str(iommu),

		__entry->qw0, __entry->qw1, __entry->qw2, __entry->qw3

	)

);

#endif /* _TRACE_INTEL_IOMMU_H */



/* This part must be outside protection */