cxl: Add userspace header file

This adds a header file for use by userspace programs wanting to interact with
the kernel cxl driver.  It defines structs and magic numbers required for
userspace to interact with devices in /dev/cxl/afuM.N.

Further documentation on this interface is added in a subsequent patch in
Documentation/powerpc/cxl.txt.

It also adds this new userspace header file to Kbuild so it's exported when
doing "make headers_installs".

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>

diff --git a/include/uapi/Kbuild b/include/uapi/Kbuild
index 81d2106287fef98433387e5a62afe628a9192950..245aa6e05e6adef3f0c0cc4ea2e3a017a2231481 100644 (file)
--- a/include/uapi/Kbuild
+++ b/include/uapi/Kbuild
@@ -12,3 +12,4 @@ header-y += video/
 header-y += drm/
 header-y += xen/
 header-y += scsi/
+header-y += misc/

diff --git a/include/uapi/misc/Kbuild b/include/uapi/misc/Kbuild
new file mode 100644 (file)
index 0000000..e96cae7
--- /dev/null
+++ b/include/uapi/misc/Kbuild
@@ -0,0 +1,2 @@
+# misc Header export list
+header-y += cxl.h

diff --git a/include/uapi/misc/cxl.h b/include/uapi/misc/cxl.h
new file mode 100644 (file)
index 0000000..c232be6
--- /dev/null
+++ b/include/uapi/misc/cxl.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _UAPI_MISC_CXL_H
+#define _UAPI_MISC_CXL_H
+
+#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;
+       __u64 amr;
+       __s16 num_interrupts;
+       __s16 reserved1;
+       __s32 reserved2;
+       __u64 reserved3;
+       __u64 reserved4;
+       __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 */
+#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 */
+
+enum cxl_event_type {
+       CXL_EVENT_RESERVED      = 0,
+       CXL_EVENT_AFU_INTERRUPT = 1,
+       CXL_EVENT_DATA_STORAGE  = 2,
+       CXL_EVENT_AFU_ERROR     = 3,
+};
+
+struct cxl_event_header {
+       __u16 type;
+       __u16 size;
+       __u16 process_element;
+       __u16 reserved1;
+};
+
+struct cxl_event_afu_interrupt {
+       __u16 flags;
+       __u16 irq; /* Raised AFU interrupt number */
+       __u32 reserved1;
+};
+
+struct cxl_event_data_storage {
+       __u16 flags;
+       __u16 reserved1;
+       __u32 reserved2;
+       __u64 addr;
+       __u64 dsisr;
+       __u64 reserved3;
+};
+
+struct cxl_event_afu_error {
+       __u16 flags;
+       __u16 reserved1;
+       __u32 reserved2;
+       __u64 error;
+};
+
+struct cxl_event {
+       struct cxl_event_header header;
+       union {
+               struct cxl_event_afu_interrupt irq;
+               struct cxl_event_data_storage fault;
+               struct cxl_event_afu_error afu_error;
+       };
+};
+
+#endif /* _UAPI_MISC_CXL_H */