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Message-Id: <63760e08571361e4aa418dab3005a008fee0df60.1676685180.git.alison.schofield@intel.com>
Date: Fri, 17 Feb 2023 18:18:53 -0800
From: alison.schofield@...el.com
To: Dan Williams <dan.j.williams@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
Ben Widawsky <bwidawsk@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>
Cc: Alison Schofield <alison.schofield@...el.com>,
linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v7 5/6] cxl/trace: Add an HPA to cxl_poison trace events
From: Alison Schofield <alison.schofield@...el.com>
When a cxl_poison trace event is reported for a region, the poisoned
Device Physical Address (DPA) can be translated to a Host Physical
Address (HPA) for consumption by user space.
Translate and add the resulting HPA to the cxl_poison trace event.
Follow the device decode logic as defined in the CXL Spec 3.0 Section
8.2.4.19.13.
If no region currently maps the poison, assign ULLONG_MAX to the
cxl_poison event hpa field.
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Alison Schofield <alison.schofield@...el.com>
---
drivers/cxl/core/trace.c | 94 ++++++++++++++++++++++++++++++++++++++++
drivers/cxl/core/trace.h | 9 +++-
2 files changed, 102 insertions(+), 1 deletion(-)
diff --git a/drivers/cxl/core/trace.c b/drivers/cxl/core/trace.c
index 29ae7ce81dc5..d0403dc3c8ab 100644
--- a/drivers/cxl/core/trace.c
+++ b/drivers/cxl/core/trace.c
@@ -1,5 +1,99 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. All rights reserved. */
+#include <cxl.h>
+#include "core.h"
+
#define CREATE_TRACE_POINTS
#include "trace.h"
+
+static bool cxl_is_hpa_in_range(u64 hpa, struct cxl_region *cxlr, int pos)
+{
+ struct cxl_region_params *p = &cxlr->params;
+ int gran = p->interleave_granularity;
+ int ways = p->interleave_ways;
+ u64 offset;
+
+ /* Is the hpa within this region at all */
+ if (hpa < p->res->start || hpa > p->res->end) {
+ dev_dbg(&cxlr->dev,
+ "Addr trans fail: hpa 0x%llx not in region\n", hpa);
+ return false;
+ }
+
+ /* Is the hpa in an expected chunk for its pos(-ition) */
+ offset = hpa - p->res->start;
+ offset = do_div(offset, gran * ways);
+ if ((offset >= pos * gran) && (offset < (pos + 1) * gran))
+ return true;
+
+ dev_dbg(&cxlr->dev,
+ "Addr trans fail: hpa 0x%llx not in expected chunk\n", hpa);
+
+ return false;
+}
+
+static u64 cxl_dpa_to_hpa(u64 dpa, struct cxl_region *cxlr,
+ struct cxl_endpoint_decoder *cxled)
+{
+ u64 dpa_offset, hpa_offset, bits_upper, mask_upper, hpa;
+ struct cxl_region_params *p = &cxlr->params;
+ int pos = cxled->pos;
+ u16 eig = 0;
+ u8 eiw = 0;
+
+ ways_to_eiw(p->interleave_ways, &eiw);
+ granularity_to_eig(p->interleave_granularity, &eig);
+
+ /*
+ * The device position in the region interleave set was removed
+ * from the offset at HPA->DPA translation. To reconstruct the
+ * HPA, place the 'pos' in the offset.
+ *
+ * The placement of 'pos' in the HPA is determined by interleave
+ * ways and granularity and is defined in the CXL Spec 3.0 Section
+ * 8.2.4.19.13 Implementation Note: Device Decode Logic
+ */
+
+ /* Remove the dpa base */
+ dpa_offset = dpa - cxl_dpa_resource_start(cxled);
+
+ mask_upper = GENMASK_ULL(51, eig + 8);
+
+ if (eiw < 8) {
+ hpa_offset = (dpa_offset & mask_upper) << eiw;
+ hpa_offset |= pos << (eig + 8);
+ } else {
+ bits_upper = (dpa_offset & mask_upper) >> (eig + 8);
+ bits_upper = bits_upper * 3;
+ hpa_offset = ((bits_upper << (eiw - 8)) + pos) << (eig + 8);
+ }
+
+ /* The lower bits remain unchanged */
+ hpa_offset |= dpa_offset & GENMASK_ULL(eig + 7, 0);
+
+ /* Apply the hpa_offset to the region base address */
+ hpa = hpa_offset + p->res->start;
+
+ if (!cxl_is_hpa_in_range(hpa, cxlr, cxled->pos))
+ return ULLONG_MAX;
+
+ return hpa;
+}
+
+u64 cxl_trace_hpa(struct cxl_region *cxlr, struct cxl_memdev *cxlmd,
+ u64 dpa)
+{
+ struct cxl_region_params *p = &cxlr->params;
+ struct cxl_endpoint_decoder *cxled = NULL;
+
+ for (int i = 0; i < p->nr_targets; i++) {
+ cxled = p->targets[i];
+ if (cxlmd == cxled_to_memdev(cxled))
+ break;
+ }
+ if (!cxled || cxlmd != cxled_to_memdev(cxled))
+ return ULLONG_MAX;
+
+ return cxl_dpa_to_hpa(dpa, cxlr, cxled);
+}
diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index 289fab1a686d..3604f31df7a6 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -612,6 +612,8 @@ TRACE_EVENT(cxl_memory_module,
#define cxl_poison_overflow(flags, time) \
(flags & CXL_POISON_FLAG_OVERFLOW ? le64_to_cpu(time) : 0)
+u64 cxl_trace_hpa(struct cxl_region *cxlr, struct cxl_memdev *memdev, u64 dpa);
+
TRACE_EVENT(cxl_poison,
TP_PROTO(struct cxl_memdev *cxlmd, struct cxl_region *region,
@@ -626,6 +628,7 @@ TRACE_EVENT(cxl_poison,
__field(u64, serial)
__string(region, region)
__field(u64, overflow_t)
+ __field(u64, hpa)
__field(u64, dpa)
__field(u32, length)
__array(char, uuid, 16)
@@ -645,18 +648,22 @@ TRACE_EVENT(cxl_poison,
if (region) {
__assign_str(region, dev_name(®ion->dev));
memcpy(__entry->uuid, ®ion->params.uuid, 16);
+ __entry->hpa = cxl_trace_hpa(region, cxlmd,
+ __entry->dpa);
} else {
__assign_str(region, "");
memset(__entry->uuid, 0, 16);
+ __entry->hpa = ULLONG_MAX;
}
),
- TP_printk("memdev=%s host=%s serial=%lld region=%s region_uuid=%pU dpa=0x%llx length=0x%x source=%s flags=%s overflow_time=%llu",
+ TP_printk("memdev=%s host=%s serial=%lld region=%s region_uuid=%pU hpa=0x%llx dpa=0x%llx length=0x%x source=%s flags=%s overflow_time=%llu",
__get_str(memdev),
__get_str(host),
__entry->serial,
__get_str(region),
__entry->uuid,
+ __entry->hpa,
__entry->dpa,
__entry->length,
show_poison_source(__entry->source),
--
2.37.3
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