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| author | Ira Weiny <ira.weiny@intel.com> | 2023-01-18 08:53:36 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-01-27 00:17:51 +0300 |
| commit | 6ebe28f9ec7228e1a35df6074695ac11d7cdcf68 (patch) | |
| tree | 553ee7859113642bfc1c888e29d0a2cbbcf5b5a1 /drivers/cxl/cxl.h | |
| parent | 172738bbccdb4ef76bdd72fc72a315c741c39161 (diff) | |
| download | linux-6ebe28f9ec7228e1a35df6074695ac11d7cdcf68.tar.xz | |
cxl/mem: Read, trace, and clear events on driver load
CXL devices have multiple event logs which can be queried for CXL event
records. Devices are required to support the storage of at least one
event record in each event log type.
Devices track event log overflow by incrementing a counter and tracking
the time of the first and last overflow event seen.
Software queries events via the Get Event Record mailbox command; CXL
rev 3.0 section 8.2.9.2.2 and clears events via CXL rev 3.0 section
8.2.9.2.3 Clear Event Records mailbox command.
If the result of negotiating CXL Error Reporting Control is OS control,
read and clear all event logs on driver load.
Ensure a clean slate of events by reading and clearing the events on
driver load.
The status register is not used because a device may continue to trigger
events and the only requirement is to empty the log at least once. This
allows for the required transition from empty to non-empty for interrupt
generation. Handling of interrupts is in a follow on patch.
The device can return up to 1MB worth of event records per query.
Allocate a shared large buffer to handle the max number of records based
on the mailbox payload size.
This patch traces a raw event record and leaves specific event record
type tracing to subsequent patches. Macros are created to aid in
tracing the common CXL Event header fields.
Each record is cleared explicitly. A clear all bit is specified but is
only valid when the log overflows.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20221216-cxl-ev-log-v7-1-2316a5c8f7d8@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index aa3af3bb73b2..5974d1082210 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -156,6 +156,18 @@ static inline int ways_to_eiw(unsigned int ways, u8 *eiw) #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000 +/* CXL 3.0 8.2.8.3.1 Event Status Register */ +#define CXLDEV_DEV_EVENT_STATUS_OFFSET 0x00 +#define CXLDEV_EVENT_STATUS_INFO BIT(0) +#define CXLDEV_EVENT_STATUS_WARN BIT(1) +#define CXLDEV_EVENT_STATUS_FAIL BIT(2) +#define CXLDEV_EVENT_STATUS_FATAL BIT(3) + +#define CXLDEV_EVENT_STATUS_ALL (CXLDEV_EVENT_STATUS_INFO | \ + CXLDEV_EVENT_STATUS_WARN | \ + CXLDEV_EVENT_STATUS_FAIL | \ + CXLDEV_EVENT_STATUS_FATAL) + /* CXL 2.0 8.2.8.4 Mailbox Registers */ #define CXLDEV_MBOX_CAPS_OFFSET 0x00 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0) |