This adds a new trace event to track the page fault request report. This event will provide almost all information defined in a page request descriptor.
A sample output: | prq_report: dmar0/0000:00:0a.0 seq# 1: rid=0x50 addr=0x559ef6f97 r---- pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 2: rid=0x50 addr=0x559ef6f9c rw--l pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 3: rid=0x50 addr=0x559ef6f98 r---- pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 4: rid=0x50 addr=0x559ef6f9d rw--l pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 5: rid=0x50 addr=0x559ef6f99 r---- pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 6: rid=0x50 addr=0x559ef6f9e rw--l pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 7: rid=0x50 addr=0x559ef6f9a r---- pasid=0x2 index=0x1 | prq_report: dmar0/0000:00:0a.0 seq# 8: rid=0x50 addr=0x559ef6f9f rw--l pasid=0x2 index=0x1 This will be helpful for I/O page fault related debugging. Signed-off-by: Lu Baolu <baolu...@linux.intel.com> Link: https://lore.kernel.org/r/20210520031531.712333-1-baolu...@linux.intel.com --- include/linux/intel-iommu.h | 29 +++++++++++++++++++++++ include/trace/events/intel_iommu.h | 37 ++++++++++++++++++++++++++++++ drivers/iommu/intel/svm.c | 7 ++++++ 3 files changed, 73 insertions(+) diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 222520d149c1..98b04fa9373e 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -778,6 +778,7 @@ struct intel_svm_dev { struct device *dev; struct intel_iommu *iommu; struct iommu_sva sva; + unsigned long prq_seq_number; u32 pasid; int users; u16 did; @@ -828,4 +829,32 @@ static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu) #define intel_iommu_enabled (0) #endif +static inline const char *decode_prq_descriptor(char *str, size_t size, + u64 dw0, u64 dw1, u64 dw2, u64 dw3) +{ + char *buf = str; + int bytes; + + bytes = snprintf(buf, size, + "rid=0x%llx addr=0x%llx %c%c%c%c%c pasid=0x%llx index=0x%llx", + FIELD_GET(GENMASK_ULL(31, 16), dw0), + FIELD_GET(GENMASK_ULL(63, 12), dw1), + dw1 & BIT_ULL(0) ? 'r' : '-', + dw1 & BIT_ULL(1) ? 'w' : '-', + dw0 & BIT_ULL(52) ? 'x' : '-', + dw0 & BIT_ULL(53) ? 'p' : '-', + dw1 & BIT_ULL(2) ? 'l' : '-', + FIELD_GET(GENMASK_ULL(51, 32), dw0), + FIELD_GET(GENMASK_ULL(11, 3), dw1)); + + /* Private Data */ + if (dw0 & BIT_ULL(9)) { + size -= bytes; + buf += bytes; + snprintf(buf, size, " private=0x%llx/0x%llx\n", dw2, dw3); + } + + return str; +} + #endif diff --git a/include/trace/events/intel_iommu.h b/include/trace/events/intel_iommu.h index d233f2916584..e5c1ca6d16ee 100644 --- a/include/trace/events/intel_iommu.h +++ b/include/trace/events/intel_iommu.h @@ -15,6 +15,8 @@ #include <linux/tracepoint.h> #include <linux/intel-iommu.h> +#define MSG_MAX 256 + TRACE_EVENT(qi_submit, TP_PROTO(struct intel_iommu *iommu, u64 qw0, u64 qw1, u64 qw2, u64 qw3), @@ -51,6 +53,41 @@ TRACE_EVENT(qi_submit, __entry->qw0, __entry->qw1, __entry->qw2, __entry->qw3 ) ); + +TRACE_EVENT(prq_report, + TP_PROTO(struct intel_iommu *iommu, struct device *dev, + u64 dw0, u64 dw1, u64 dw2, u64 dw3, + unsigned long seq), + + TP_ARGS(iommu, dev, dw0, dw1, dw2, dw3, seq), + + TP_STRUCT__entry( + __field(u64, dw0) + __field(u64, dw1) + __field(u64, dw2) + __field(u64, dw3) + __field(unsigned long, seq) + __string(iommu, iommu->name) + __string(dev, dev_name(dev)) + __dynamic_array(char, buff, MSG_MAX) + ), + + TP_fast_assign( + __entry->dw0 = dw0; + __entry->dw1 = dw1; + __entry->dw2 = dw2; + __entry->dw3 = dw3; + __entry->seq = seq; + __assign_str(iommu, iommu->name); + __assign_str(dev, dev_name(dev)); + ), + + TP_printk("%s/%s seq# %ld: %s", + __get_str(iommu), __get_str(dev), __entry->seq, + decode_prq_descriptor(__get_str(buff), MSG_MAX, __entry->dw0, + __entry->dw1, __entry->dw2, __entry->dw3) + ) +); #endif /* _TRACE_INTEL_IOMMU_H */ /* This part must be outside protection */ diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index ade157b64ce7..d3d028c6a727 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -21,6 +21,7 @@ #include <linux/ioasid.h> #include <asm/page.h> #include <asm/fpu/api.h> +#include <trace/events/intel_iommu.h> #include "pasid.h" #include "../iommu-sva-lib.h" @@ -976,12 +977,18 @@ static irqreturn_t prq_event_thread(int irq, void *d) goto bad_req; } + sdev->prq_seq_number++; + /* * If prq is to be handled outside iommu driver via receiver of * the fault notifiers, we skip the page response here. */ if (intel_svm_prq_report(sdev->dev, req)) handle_bad_prq_event(iommu, req, QI_RESP_INVALID); + + trace_prq_report(iommu, sdev->dev, req->qw_0, req->qw_1, + req->priv_data[0], req->priv_data[1], + sdev->prq_seq_number); prq_advance: head = (head + sizeof(*req)) & PRQ_RING_MASK; } -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
