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linux-next/drivers/misc/cxl
Philippe Bergheaud b810253bd9 cxl: Add mechanism for delivering AFU driver specific events
This adds an afu_driver_ops structure with fetch_event() and
event_delivered() callbacks. An AFU driver such as cxlflash can fill
this out and associate it with a context to enable passing custom AFU
specific events to userspace.

This also adds a new kernel API function cxl_context_pending_events(),
that the AFU driver can use to notify the cxl driver that new specific
events are ready to be delivered, and wake up anyone waiting on the
context wait queue.

The current count of AFU driver specific events is stored in the field
afu_driver_events of the context structure.

The cxl driver checks the afu_driver_events count during poll, select,
read, etc. calls to check if an AFU driver specific event is pending,
and calls fetch_event() to obtain and deliver that event. This way, the
cxl driver takes care of all the usual locking semantics around these
calls and handles all the generic cxl events, so that the AFU driver
only needs to worry about it's own events.

fetch_event() return a struct cxl_event_afu_driver_reserved, allocated
by the AFU driver, and filled in with the specific event information and
size. Total event size (header + data) should not be greater than
CXL_READ_MIN_SIZE (4K).

Th cxl driver prepends an appropriate cxl event header, copies the event
to userspace, and finally calls event_delivered() to return the status of
the operation to the AFU driver. The event is identified by the context
and cxl_event_afu_driver_reserved pointers.

Since AFU drivers provide their own means for userspace to obtain the
AFU file descriptor (i.e. cxlflash uses an ioctl on their scsi file
descriptor to obtain the AFU file descriptor) and the generic cxl driver
will never use this event, the ABI of the event is up to each individual
AFU driver.

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-06-28 18:34:56 +10:00
..
api.c cxl: Add mechanism for delivering AFU driver specific events 2016-06-28 18:34:56 +10:00
base.c cxl: Parse device tree and create cxl device(s) at boot 2016-03-09 23:39:59 +11:00
context.c powerpc updates for 4.7 2016-05-20 10:12:41 -07:00
cxl.h cxl: Add mechanism for delivering AFU driver specific events 2016-06-28 18:34:56 +10:00
debugfs.c cxl: Abstract the differences between the PSL and XSL 2016-06-16 23:08:54 +10:00
fault.c powerpc/mm: Replace _PAGE_USER with _PAGE_PRIVILEGED 2016-05-01 18:32:26 +10:00
file.c cxl: Add mechanism for delivering AFU driver specific events 2016-06-28 18:34:56 +10:00
flash.c cxl: static-ify variables to fix sparse warnings 2016-06-16 22:49:27 +10:00
guest.c cxl: Update process element after allocating interrupts 2016-06-16 23:08:49 +10:00
hcalls.c cxl: Add tracepoints around the cxl hcall 2016-03-09 23:40:01 +11:00
hcalls.h cxl: Add guest-specific code 2016-03-09 23:36:52 +11:00
irq.c cxl: Keep IRQ mappings on context teardown 2016-04-27 12:04:31 +10:00
Kconfig cxl: Add mechanism for delivering AFU driver specific events 2016-06-28 18:34:56 +10:00
main.c cxl: Adapter failure handling 2016-03-09 23:40:00 +11:00
Makefile cxl: Support to flash a new image on the adapter from a guest 2016-03-09 23:39:56 +11:00
native.c cxl: Abstract the differences between the PSL and XSL 2016-06-16 23:08:54 +10:00
of.c cxl: Add guest-specific code 2016-03-09 23:36:52 +11:00
pci.c cxl: Add support for CAPP DMA mode 2016-06-16 23:10:26 +10:00
sysfs.c cxl: Allow initialization on timebase sync failures 2016-04-22 21:45:44 +10:00
trace.c cxl: Add tracepoints 2015-01-22 17:31:51 +11:00
trace.h cxl: Add tracepoints around the cxl hcall 2016-03-09 23:40:01 +11:00
vphb.c cxl: Make vPHB device node match adapter's 2016-06-16 23:11:30 +10:00