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cxl: Add documentation for userspace APIs

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This documentation gives an overview of the hardware architecture, userspace
APIs via /dev/cxl/afuM.N and the syfs files. It also adds a MAINTAINERS file
entry for cxl.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ian Munsie
2014-10-08 19:55:05 +11:00
committed by Michael Ellerman
parent 881632c905
commit a9282d01cf
6 changed files with 527 additions and 3 deletions
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7
include/uapi/misc/cxl.h
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@@ -13,7 +13,7 @@
#include <linux/types.h>
#include <linux/ioctl.h>
/* Structs for IOCTLS for userspace to talk to the kernel */
struct cxl_ioctl_start_work {
__u64 flags;
__u64 work_element_descriptor;
@@ -26,19 +26,20 @@ struct cxl_ioctl_start_work {
__u64 reserved5;
__u64 reserved6;
};
#define CXL_START_WORK_AMR 0x0000000000000001ULL
#define CXL_START_WORK_NUM_IRQS 0x0000000000000002ULL
#define CXL_START_WORK_ALL (CXL_START_WORK_AMR |\
CXL_START_WORK_NUM_IRQS)
/* IOCTL numbers */
/* ioctl numbers */
#define CXL_MAGIC 0xCA
#define CXL_IOCTL_START_WORK _IOW(CXL_MAGIC, 0x00, struct cxl_ioctl_start_work)
#define CXL_IOCTL_GET_PROCESS_ELEMENT _IOR(CXL_MAGIC, 0x01, __u32)
/* Events from read() */
#define CXL_READ_MIN_SIZE 0x1000 /* 4K */
/* Events from read() */
enum cxl_event_type {
CXL_EVENT_RESERVED = 0,
CXL_EVENT_AFU_INTERRUPT = 1,