[PATCH v3] cxl/events: Use a common struct for DRAM and General Media events

From: Fabio M. De Francesco
Date: Sat May 18 2024 - 07:33:41 EST

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cxl_event_common was an unfortunate naming choice and caused confusion with
the existing Common Event Record. Furthermore, its fields didn't map all
the common information between DRAM and General Media Events.

Remove cxl_event_common and introduce cxl_event_media_hdr to record common
information between DRAM and General Media events.

cxl_event_media_hdr, which is embedded in both cxl_event_gen_media and
cxl_event_dram, leverages the commonalities between the two events to
simplify their respective handling.

Suggested-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@xxxxxxxxxxxxxxx>
---

- Changes for v3 -

- Rework the layout of cxl_event_dram and cxl_event_gen_media
to make a simpler change (Dan)
- Remove a "Fixes" tag (Dan)
- Don't use unnecessary struct_group[_tagged] (Jonathan, Ira)
- Rewrite end extend the commit message

- Link to v2 -

https://lore.kernel.org/linux-cxl/20240516102116.3512377-1-fabio.m.de.francesco@xxxxxxxxxxxxxxx/

drivers/cxl/core/mbox.c | 2 +-
drivers/cxl/core/trace.h | 32 ++++++++++++++---------------
include/linux/cxl-event.h | 40 +++++++++++++-----------------------
tools/testing/cxl/test/mem.c | 30 +++++++++++++--------------
4 files changed, 46 insertions(+), 58 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 2626f3fff201..a08f050cc1ca 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -875,7 +875,7 @@ void cxl_event_trace_record(const struct cxl_memdev *cxlmd,
guard(rwsem_read)(&cxl_region_rwsem);
guard(rwsem_read)(&cxl_dpa_rwsem);

- dpa = le64_to_cpu(evt->common.phys_addr) & CXL_DPA_MASK;
+ dpa = le64_to_cpu(evt->media_hdr.phys_addr) & CXL_DPA_MASK;
cxlr = cxl_dpa_to_region(cxlmd, dpa);
if (cxlr)
hpa = cxl_trace_hpa(cxlr, cxlmd, dpa);
diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index 07a0394b1d99..5a76f94accf4 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -340,23 +340,23 @@ TRACE_EVENT(cxl_general_media,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, rec->media_hdr.hdr);
__entry->hdr_uuid = CXL_EVENT_GEN_MEDIA_UUID;

/* General Media */
- __entry->dpa = le64_to_cpu(rec->phys_addr);
+ __entry->dpa = le64_to_cpu(rec->media_hdr.phys_addr);
__entry->dpa_flags = __entry->dpa & CXL_DPA_FLAGS_MASK;
/* Mask after flags have been parsed */
__entry->dpa &= CXL_DPA_MASK;
- __entry->descriptor = rec->descriptor;
- __entry->type = rec->type;
- __entry->transaction_type = rec->transaction_type;
- __entry->channel = rec->channel;
- __entry->rank = rec->rank;
+ __entry->descriptor = rec->media_hdr.descriptor;
+ __entry->type = rec->media_hdr.type;
+ __entry->transaction_type = rec->media_hdr.transaction_type;
+ __entry->channel = rec->media_hdr.channel;
+ __entry->rank = rec->media_hdr.rank;
__entry->device = get_unaligned_le24(rec->device);
memcpy(__entry->comp_id, &rec->component_id,
CXL_EVENT_GEN_MED_COMP_ID_SIZE);
- __entry->validity_flags = get_unaligned_le16(&rec->validity_flags);
+ __entry->validity_flags = get_unaligned_le16(&rec->media_hdr.validity_flags);
__entry->hpa = hpa;
if (cxlr) {
__assign_str(region_name, dev_name(&cxlr->dev));
@@ -440,19 +440,19 @@ TRACE_EVENT(cxl_dram,
),

TP_fast_assign(
- CXL_EVT_TP_fast_assign(cxlmd, log, rec->hdr);
+ CXL_EVT_TP_fast_assign(cxlmd, log, rec->media_hdr.hdr);
__entry->hdr_uuid = CXL_EVENT_DRAM_UUID;

/* DRAM */
- __entry->dpa = le64_to_cpu(rec->phys_addr);
+ __entry->dpa = le64_to_cpu(rec->media_hdr.phys_addr);
__entry->dpa_flags = __entry->dpa & CXL_DPA_FLAGS_MASK;
__entry->dpa &= CXL_DPA_MASK;
- __entry->descriptor = rec->descriptor;
- __entry->type = rec->type;
- __entry->transaction_type = rec->transaction_type;
- __entry->validity_flags = get_unaligned_le16(rec->validity_flags);
- __entry->channel = rec->channel;
- __entry->rank = rec->rank;
+ __entry->descriptor = rec->media_hdr.descriptor;
+ __entry->type = rec->media_hdr.type;
+ __entry->transaction_type = rec->media_hdr.transaction_type;
+ __entry->validity_flags = get_unaligned_le16(rec->media_hdr.validity_flags);
+ __entry->channel = rec->media_hdr.channel;
+ __entry->rank = rec->media_hdr.rank;
__entry->nibble_mask = get_unaligned_le24(rec->nibble_mask);
__entry->bank_group = rec->bank_group;
__entry->bank = rec->bank;
diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h
index 60b25020281f..6562663a036d 100644
--- a/include/linux/cxl-event.h
+++ b/include/linux/cxl-event.h
@@ -21,6 +21,17 @@ struct cxl_event_record_hdr {
u8 reserved[15];
} __packed;

+struct cxl_event_media_hdr {
+ struct cxl_event_record_hdr hdr;
+ __le64 phys_addr;
+ u8 descriptor;
+ u8 type;
+ u8 transaction_type;
+ u8 validity_flags[2];
+ u8 channel;
+ u8 rank;
+} __packed;
+
#define CXL_EVENT_RECORD_DATA_LENGTH 0x50
struct cxl_event_generic {
struct cxl_event_record_hdr hdr;
@@ -33,14 +44,7 @@ struct cxl_event_generic {
*/
#define CXL_EVENT_GEN_MED_COMP_ID_SIZE 0x10
struct cxl_event_gen_media {
- struct cxl_event_record_hdr hdr;
- __le64 phys_addr;
- u8 descriptor;
- u8 type;
- u8 transaction_type;
- u8 validity_flags[2];
- u8 channel;
- u8 rank;
+ struct cxl_event_media_hdr media_hdr;
u8 device[3];
u8 component_id[CXL_EVENT_GEN_MED_COMP_ID_SIZE];
u8 reserved[46];
@@ -52,14 +56,7 @@ struct cxl_event_gen_media {
*/
#define CXL_EVENT_DER_CORRECTION_MASK_SIZE 0x20
struct cxl_event_dram {
- struct cxl_event_record_hdr hdr;
- __le64 phys_addr;
- u8 descriptor;
- u8 type;
- u8 transaction_type;
- u8 validity_flags[2];
- u8 channel;
- u8 rank;
+ struct cxl_event_media_hdr media_hdr;
u8 nibble_mask[3];
u8 bank_group;
u8 bank;
@@ -95,21 +92,12 @@ struct cxl_event_mem_module {
u8 reserved[0x3d];
} __packed;

-/*
- * General Media or DRAM Event Common Fields
- * - provides common access to phys_addr
- */
-struct cxl_event_common {
- struct cxl_event_record_hdr hdr;
- __le64 phys_addr;
-} __packed;
-
union cxl_event {
struct cxl_event_generic generic;
struct cxl_event_gen_media gen_media;
struct cxl_event_dram dram;
struct cxl_event_mem_module mem_module;
- struct cxl_event_common common;
+ struct cxl_event_media_hdr media_hdr;
} __packed;

/*
diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 6584443144de..63b71541d399 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -384,19 +384,19 @@ struct cxl_test_gen_media {
struct cxl_test_gen_media gen_media = {
.id = CXL_EVENT_GEN_MEDIA_UUID,
.rec = {
- .hdr = {
+ .media_hdr.hdr = {
.length = sizeof(struct cxl_test_gen_media),
.flags[0] = CXL_EVENT_RECORD_FLAG_PERMANENT,
/* .handle = Set dynamically */
.related_handle = cpu_to_le16(0),
},
- .phys_addr = cpu_to_le64(0x2000),
- .descriptor = CXL_GMER_EVT_DESC_UNCORECTABLE_EVENT,
- .type = CXL_GMER_MEM_EVT_TYPE_DATA_PATH_ERROR,
- .transaction_type = CXL_GMER_TRANS_HOST_WRITE,
+ .media_hdr.phys_addr = cpu_to_le64(0x2000),
+ .media_hdr.descriptor = CXL_GMER_EVT_DESC_UNCORECTABLE_EVENT,
+ .media_hdr.type = CXL_GMER_MEM_EVT_TYPE_DATA_PATH_ERROR,
+ .media_hdr.transaction_type = CXL_GMER_TRANS_HOST_WRITE,
/* .validity_flags = <set below> */
- .channel = 1,
- .rank = 30
+ .media_hdr.channel = 1,
+ .media_hdr.rank = 30
},
};

@@ -408,18 +408,18 @@ struct cxl_test_dram {
struct cxl_test_dram dram = {
.id = CXL_EVENT_DRAM_UUID,
.rec = {
- .hdr = {
+ .media_hdr.hdr = {
.length = sizeof(struct cxl_test_dram),
.flags[0] = CXL_EVENT_RECORD_FLAG_PERF_DEGRADED,
/* .handle = Set dynamically */
.related_handle = cpu_to_le16(0),
},
- .phys_addr = cpu_to_le64(0x8000),
- .descriptor = CXL_GMER_EVT_DESC_THRESHOLD_EVENT,
- .type = CXL_GMER_MEM_EVT_TYPE_INV_ADDR,
- .transaction_type = CXL_GMER_TRANS_INTERNAL_MEDIA_SCRUB,
+ .media_hdr.phys_addr = cpu_to_le64(0x8000),
+ .media_hdr.descriptor = CXL_GMER_EVT_DESC_THRESHOLD_EVENT,
+ .media_hdr.type = CXL_GMER_MEM_EVT_TYPE_INV_ADDR,
+ .media_hdr.transaction_type = CXL_GMER_TRANS_INTERNAL_MEDIA_SCRUB,
/* .validity_flags = <set below> */
- .channel = 1,
+ .media_hdr.channel = 1,
.bank_group = 5,
.bank = 2,
.column = {0xDE, 0xAD},
@@ -473,11 +473,11 @@ static int mock_set_timestamp(struct cxl_dev_state *cxlds,
static void cxl_mock_add_event_logs(struct mock_event_store *mes)
{
put_unaligned_le16(CXL_GMER_VALID_CHANNEL | CXL_GMER_VALID_RANK,
- &gen_media.rec.validity_flags);
+ &gen_media.rec.media_hdr.validity_flags);

put_unaligned_le16(CXL_DER_VALID_CHANNEL | CXL_DER_VALID_BANK_GROUP |
CXL_DER_VALID_BANK | CXL_DER_VALID_COLUMN,
- &dram.rec.validity_flags);
+ &dram.rec.media_hdr.validity_flags);

mes_add_event(mes, CXL_EVENT_TYPE_INFO, &maint_needed);
mes_add_event(mes, CXL_EVENT_TYPE_INFO,
--
2.45.0

Next message: Jarkko Sakkinen: "[PATCH] tpm: Disable TCG_TPM2_HMAC by default"
Previous message: Jarkko Sakkinen: "Re: SLB9670 TPM module crash"
Next in thread: Fabio M. De Francesco: " Re: [PATCH v3] cxl/events: Use a common struct for DRAM and General Media events"
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