Ira Weiny wrote: > 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@xxxxxxxxxx> > Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> [..] > diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h > index 20ca2fe2ca8e..6898212fcb47 100644 > --- a/drivers/cxl/core/trace.h > +++ b/drivers/cxl/core/trace.h > @@ -6,7 +6,9 @@ > #if !defined(_CXL_EVENTS_H) || defined(TRACE_HEADER_MULTI_READ) > #define _CXL_EVENTS_H > > +#include <asm-generic/unaligned.h> > #include <cxl.h> > +#include <cxlmem.h> > #include <linux/tracepoint.h> > > #define CXL_RAS_UC_CACHE_DATA_PARITY BIT(0) > @@ -103,6 +105,124 @@ TRACE_EVENT(cxl_aer_correctable_error, > ) > ); > > +#include <linux/tracepoint.h> missed this earlier, no need to include this again. Will drop it in my local tree.
