* [ndctl RFC PATCH 1/5] cxl: add a cxl utility and libcxl library
2021-01-12 0:33 [ndctl RFC PATCH 0/5] Initial CXL support Vishal Verma
@ 2021-01-12 0:33 ` Vishal Verma
2021-01-12 0:34 ` [ndctl RFC PATCH 2/5] cxl: add a local copy of the cxl_mem UAPI header Vishal Verma
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Vishal Verma @ 2021-01-12 0:33 UTC (permalink / raw)
To: linux-cxl; +Cc: linux-nvdimm, Ben Widawsky
CXL - or Compute eXpress Link - is a new interconnect that extends PCIe
to support a wide range of devices, including cache coherent memory
expanders. As such, these devices can be new sources of 'persistent
memory', and the 'ndctl' umbrella of tools and libraries needs to be able
to interact with them.
Add a new utility and library for managing these CXL memory devices. This
is an initial bring-up for interacting with CXL devices, and only includes
adding the utility and library infrastructure, parsing device information
from sysfs for CXL devices, and providing a 'cxl-list' command to
display this information in JSON formatted output.
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
Documentation/cxl/cxl-list.txt | 65 ++++++
Documentation/cxl/cxl.txt | 34 +++
Documentation/cxl/human-option.txt | 8 +
Documentation/cxl/verbose-option.txt | 5 +
configure.ac | 3 +
Makefile.am | 4 +-
Makefile.am.in | 4 +
cxl/lib/private.h | 28 +++
cxl/lib/libcxl.c | 318 +++++++++++++++++++++++++++
cxl/builtin.h | 8 +
cxl/libcxl.h | 52 +++++
util/filter.h | 2 +
util/json.h | 3 +
util/main.h | 3 +
cxl/cxl.c | 95 ++++++++
cxl/list.c | 113 ++++++++++
util/filter.c | 20 ++
util/json.c | 26 +++
Documentation/cxl/Makefile.am | 58 +++++
cxl/Makefile.am | 21 ++
cxl/lib/Makefile.am | 32 +++
cxl/lib/libcxl.pc.in | 11 +
cxl/lib/libcxl.sym | 26 +++
23 files changed, 937 insertions(+), 2 deletions(-)
create mode 100644 Documentation/cxl/cxl-list.txt
create mode 100644 Documentation/cxl/cxl.txt
create mode 100644 Documentation/cxl/human-option.txt
create mode 100644 Documentation/cxl/verbose-option.txt
create mode 100644 cxl/lib/private.h
create mode 100644 cxl/lib/libcxl.c
create mode 100644 cxl/builtin.h
create mode 100644 cxl/libcxl.h
create mode 100644 cxl/cxl.c
create mode 100644 cxl/list.c
create mode 100644 Documentation/cxl/Makefile.am
create mode 100644 cxl/Makefile.am
create mode 100644 cxl/lib/Makefile.am
create mode 100644 cxl/lib/libcxl.pc.in
create mode 100644 cxl/lib/libcxl.sym
diff --git a/Documentation/cxl/cxl-list.txt b/Documentation/cxl/cxl-list.txt
new file mode 100644
index 0000000..107b388
--- /dev/null
+++ b/Documentation/cxl/cxl-list.txt
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0
+
+cxl-list(1)
+===========
+
+NAME
+----
+cxl-list - CXL capable host bridges, switches, devices, and their attributes
+in json.
+
+SYNOPSIS
+--------
+[verse]
+'cxl list' [<options>]
+
+Walk the CXL capable device hierarchy in the system and list all device
+instances along with some of their major attributes.
+
+Options can be specified to limit the output to specific devices.
+By default, 'cxl list' with no options is equivalent to:
+[verse]
+cxl list --devices
+
+EXAMPLE
+-------
+----
+# cxl list --devices
+{
+ "memdev":"mem0",
+ "pmem_size":268435456,
+ "ram_size":0,
+}
+----
+
+OPTIONS
+-------
+-d::
+--dev=::
+ Specify a cxl device name to filter the listing. For example:
+----
+# cxl list --dev=mem0
+{
+ "memdev":"mem0",
+ "pmem_size":268435456,
+ "ram_size":0,
+}
+----
+
+-D::
+--devices::
+ Include all CXL devices in the listing
+
+-i::
+--idle::
+ Include idle (not enabled / zero-sized) devices in the listing
+
+include::human-option.txt[]
+
+include::verbose-option.txt[]
+
+include::../copyright.txt[]
+
+SEE ALSO
+--------
+linkcxl:ndctl-list[1]
diff --git a/Documentation/cxl/cxl.txt b/Documentation/cxl/cxl.txt
new file mode 100644
index 0000000..e99e61b
--- /dev/null
+++ b/Documentation/cxl/cxl.txt
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+
+cxl(1)
+======
+
+NAME
+----
+cxl - Provides enumeration and provisioning commands for CXL devices
+
+SYNOPSIS
+--------
+[verse]
+'cxl' [--version] [--help] COMMAND [ARGS]
+
+OPTIONS
+-------
+-v::
+--version::
+ Display the version of the 'cxl' utility.
+
+-h::
+--help::
+ Run the 'cxl help' command.
+
+DESCRIPTION
+-----------
+The cxl utility provides enumeration and provisioning commands for
+the CXL devices managed by the Linux kernel.
+
+include::../copyright.txt[]
+
+SEE ALSO
+--------
+linkcxl:ndctl[1]
diff --git a/Documentation/cxl/human-option.txt b/Documentation/cxl/human-option.txt
new file mode 100644
index 0000000..2f4de7a
--- /dev/null
+++ b/Documentation/cxl/human-option.txt
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+-u::
+--human::
+ By default the command will output machine-friendly raw-integer
+ data. Instead, with this flag, numbers representing storage size
+ will be formatted as human readable strings with units, other
+ fields are converted to hexadecimal strings.
diff --git a/Documentation/cxl/verbose-option.txt b/Documentation/cxl/verbose-option.txt
new file mode 100644
index 0000000..cb62c8e
--- /dev/null
+++ b/Documentation/cxl/verbose-option.txt
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
+
+-v::
+--verbose::
+ Emit more debug messages
diff --git a/configure.ac b/configure.ac
index 5ec8d2f..7f5e6f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -222,12 +222,15 @@ AC_CONFIG_HEADERS(config.h)
AC_CONFIG_FILES([
Makefile
daxctl/lib/Makefile
+ cxl/lib/Makefile
ndctl/lib/Makefile
ndctl/Makefile
daxctl/Makefile
+ cxl/Makefile
test/Makefile
Documentation/ndctl/Makefile
Documentation/daxctl/Makefile
+ Documentation/cxl/Makefile
])
AC_OUTPUT
diff --git a/Makefile.am b/Makefile.am
index 60a1998..ec4b9ed 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,9 +1,9 @@
include Makefile.am.in
ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
-SUBDIRS = . daxctl/lib ndctl/lib ndctl daxctl
+SUBDIRS = . cxl/lib daxctl/lib ndctl/lib cxl ndctl daxctl
if ENABLE_DOCS
-SUBDIRS += Documentation/ndctl Documentation/daxctl
+SUBDIRS += Documentation/ndctl Documentation/daxctl Documentation/cxl
endif
SUBDIRS += test
diff --git a/Makefile.am.in b/Makefile.am.in
index bdceda9..6931d8c 100644
--- a/Makefile.am.in
+++ b/Makefile.am.in
@@ -42,3 +42,7 @@ LIBNDCTL_AGE=19
LIBDAXCTL_CURRENT=6
LIBDAXCTL_REVISION=0
LIBDAXCTL_AGE=5
+
+LIBCXL_CURRENT=0
+LIBCXL_REVISION=0
+LIBCXL_AGE=0
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
new file mode 100644
index 0000000..f787512
--- /dev/null
+++ b/cxl/lib/private.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/* Copyright (C) 2020-2021, Intel Corporation. All rights reserved. */
+#ifndef _LIBCXL_PRIVATE_H_
+#define _LIBCXL_PRIVATE_H_
+
+#include <libkmod.h>
+
+#define CXL_EXPORT __attribute__ ((visibility("default")))
+
+struct cxl_memdev {
+ int id, major, minor;
+ void *dev_buf;
+ size_t buf_len;
+ char *dev_path;
+ struct cxl_ctx *ctx;
+ struct list_node list;
+ unsigned long long pmem_size;
+ unsigned long long ram_size;
+ int payload_max;
+ struct kmod_module *module;
+};
+
+static inline int check_kmod(struct kmod_ctx *kmod_ctx)
+{
+ return kmod_ctx ? 0 : -ENXIO;
+}
+
+#endif /* _LIBCXL_PRIVATE_H_ */
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
new file mode 100644
index 0000000..c864208
--- /dev/null
+++ b/cxl/lib/libcxl.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: LGPL-2.1
+// Copyright (C) 2020-2021, Intel Corporation. All rights reserved.
+#include <stdio.h>
+#include <errno.h>
+#include <limits.h>
+#include <libgen.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/sysmacros.h>
+#include <uuid/uuid.h>
+#include <ccan/list/list.h>
+#include <ccan/array_size/array_size.h>
+
+#include <util/log.h>
+#include <util/sysfs.h>
+#include <cxl/libcxl.h>
+#include "private.h"
+
+/**
+ * struct cxl_ctx - library user context to find "nd" instances
+ *
+ * Instantiate with cxl_new(), which takes an initial reference. Free
+ * the context by dropping the reference count to zero with
+ * cxl_unref(), or take additional references with cxl_ref()
+ * @timeout: default library timeout in milliseconds
+ */
+struct cxl_ctx {
+ /* log_ctx must be first member for cxl_set_log_fn compat */
+ struct log_ctx ctx;
+ int refcount;
+ void *userdata;
+ int memdevs_init;
+ struct list_head memdevs;
+ struct kmod_ctx *kmod_ctx;
+};
+
+static void free_memdev(struct cxl_memdev *memdev, struct list_head *head)
+{
+ if (head)
+ list_del_from(head, &memdev->list);
+ kmod_module_unref(memdev->module);
+ free(memdev->dev_buf);
+ free(memdev->dev_path);
+ free(memdev);
+}
+
+/**
+ * cxl_get_userdata - retrieve stored data pointer from library context
+ * @ctx: cxl library context
+ *
+ * This might be useful to access from callbacks like a custom logging
+ * function.
+ */
+CXL_EXPORT void *cxl_get_userdata(struct cxl_ctx *ctx)
+{
+ if (ctx == NULL)
+ return NULL;
+ return ctx->userdata;
+}
+
+/**
+ * cxl_set_userdata - store custom @userdata in the library context
+ * @ctx: cxl library context
+ * @userdata: data pointer
+ */
+CXL_EXPORT void cxl_set_userdata(struct cxl_ctx *ctx, void *userdata)
+{
+ if (ctx == NULL)
+ return;
+ ctx->userdata = userdata;
+}
+
+/**
+ * cxl_new - instantiate a new library context
+ * @ctx: context to establish
+ *
+ * Returns zero on success and stores an opaque pointer in ctx. The
+ * context is freed by cxl_unref(), i.e. cxl_new() implies an
+ * internal cxl_ref().
+ */
+CXL_EXPORT int cxl_new(struct cxl_ctx **ctx)
+{
+ struct kmod_ctx *kmod_ctx;
+ struct cxl_ctx *c;
+ int rc = 0;
+
+ c = calloc(1, sizeof(struct cxl_ctx));
+ if (!c)
+ return -ENOMEM;
+
+ kmod_ctx = kmod_new(NULL, NULL);
+ if (check_kmod(kmod_ctx) != 0) {
+ rc = -ENXIO;
+ goto out;
+ }
+
+ c->refcount = 1;
+ log_init(&c->ctx, "libcxl", "CXL_LOG");
+ info(c, "ctx %p created\n", c);
+ dbg(c, "log_priority=%d\n", c->ctx.log_priority);
+ *ctx = c;
+ list_head_init(&c->memdevs);
+ c->kmod_ctx = kmod_ctx;
+
+ return 0;
+out:
+ free(c);
+ return rc;
+}
+
+/**
+ * cxl_ref - take an additional reference on the context
+ * @ctx: context established by cxl_new()
+ */
+CXL_EXPORT struct cxl_ctx *cxl_ref(struct cxl_ctx *ctx)
+{
+ if (ctx == NULL)
+ return NULL;
+ ctx->refcount++;
+ return ctx;
+}
+
+/**
+ * cxl_unref - drop a context reference count
+ * @ctx: context established by cxl_new()
+ *
+ * Drop a reference and if the resulting reference count is 0 destroy
+ * the context.
+ */
+CXL_EXPORT void cxl_unref(struct cxl_ctx *ctx)
+{
+ struct cxl_memdev *memdev, *_d;
+
+ if (ctx == NULL)
+ return;
+ ctx->refcount--;
+ if (ctx->refcount > 0)
+ return;
+
+ list_for_each_safe(&ctx->memdevs, memdev, _d, list)
+ free_memdev(memdev, &ctx->memdevs);
+
+ kmod_unref(ctx->kmod_ctx);
+ info(ctx, "context %p released\n", ctx);
+ free(ctx);
+}
+
+/**
+ * cxl_set_log_fn - override default log routine
+ * @ctx: cxl library context
+ * @log_fn: function to be called for logging messages
+ *
+ * The built-in logging writes to stderr. It can be overridden by a
+ * custom function, to plug log messages into the user's logging
+ * functionality.
+ */
+CXL_EXPORT void cxl_set_log_fn(struct cxl_ctx *ctx,
+ void (*cxl_log_fn)(struct cxl_ctx *ctx, int priority,
+ const char *file, int line, const char *fn,
+ const char *format, va_list args))
+{
+ ctx->ctx.log_fn = (log_fn) cxl_log_fn;
+ info(ctx, "custom logging function %p registered\n", cxl_log_fn);
+}
+
+/**
+ * cxl_get_log_priority - retrieve current library loglevel (syslog)
+ * @ctx: cxl library context
+ */
+CXL_EXPORT int cxl_get_log_priority(struct cxl_ctx *ctx)
+{
+ return ctx->ctx.log_priority;
+}
+
+/**
+ * cxl_set_log_priority - set log verbosity
+ * @priority: from syslog.h, LOG_ERR, LOG_INFO, LOG_DEBUG
+ *
+ * Note: LOG_DEBUG requires library be built with "configure --enable-debug"
+ */
+CXL_EXPORT void cxl_set_log_priority(struct cxl_ctx *ctx, int priority)
+{
+ ctx->ctx.log_priority = priority;
+}
+
+static void *add_cxl_memdev(void *parent, int id, const char *cxlmem_base)
+{
+ const char *devname = devpath_to_devname(cxlmem_base);
+ char *path = calloc(1, strlen(cxlmem_base) + 100);
+ struct cxl_ctx *ctx = parent;
+ struct cxl_memdev *memdev, *memdev_dup;
+ char buf[SYSFS_ATTR_SIZE];
+ struct stat st;
+
+ if (!path)
+ return NULL;
+ dbg(ctx, "%s: base: \'%s\'\n", __func__, cxlmem_base);
+
+ memdev = calloc(1, sizeof(*memdev));
+ if (!memdev)
+ goto err_dev;
+ memdev->id = id;
+ memdev->ctx = ctx;
+
+ sprintf(path, "/dev/cxl/%s", devname);
+ if (stat(path, &st) < 0)
+ goto err_read;
+ memdev->major = major(st.st_rdev);
+ memdev->minor = minor(st.st_rdev);
+
+ sprintf(path, "%s/pmem/size", cxlmem_base);
+ if (sysfs_read_attr(ctx, path, buf) < 0)
+ goto err_read;
+ memdev->pmem_size = strtoull(buf, NULL, 0);
+
+ sprintf(path, "%s/ram/size", cxlmem_base);
+ if (sysfs_read_attr(ctx, path, buf) < 0)
+ goto err_read;
+ memdev->ram_size = strtoull(buf, NULL, 0);
+
+ sprintf(path, "%s/payload_max", cxlmem_base);
+ if (sysfs_read_attr(ctx, path, buf) < 0)
+ goto err_read;
+ memdev->payload_max = strtoull(buf, NULL, 0);
+ if (memdev->payload_max < 0)
+ goto err_read;
+
+ memdev->dev_path = strdup(cxlmem_base);
+ if (!memdev->dev_path)
+ goto err_read;
+
+ memdev->dev_buf = calloc(1, strlen(cxlmem_base) + 50);
+ if (!memdev->dev_buf)
+ goto err_read;
+ memdev->buf_len = strlen(cxlmem_base) + 50;
+
+ cxl_memdev_foreach(ctx, memdev_dup)
+ if (memdev_dup->id == memdev->id) {
+ free_memdev(memdev, NULL);
+ free(path);
+ return memdev_dup;
+ }
+
+ list_add(&ctx->memdevs, &memdev->list);
+ free(path);
+ return memdev;
+
+ err_read:
+ free(memdev->dev_buf);
+ free(memdev->dev_path);
+ free(memdev);
+ err_dev:
+ free(path);
+ return NULL;
+}
+
+static void cxl_memdevs_init(struct cxl_ctx *ctx)
+{
+ if (ctx->memdevs_init)
+ return;
+
+ ctx->memdevs_init = 1;
+
+ sysfs_device_parse(ctx, "/sys/bus/cxl/devices", "mem", ctx,
+ add_cxl_memdev);
+}
+
+CXL_EXPORT struct cxl_ctx *cxl_memdev_get_ctx(struct cxl_memdev *memdev)
+{
+ return memdev->ctx;
+}
+
+CXL_EXPORT struct cxl_memdev *cxl_memdev_get_first(struct cxl_ctx *ctx)
+{
+ cxl_memdevs_init(ctx);
+
+ return list_top(&ctx->memdevs, struct cxl_memdev, list);
+}
+
+CXL_EXPORT struct cxl_memdev *cxl_memdev_get_next(struct cxl_memdev *memdev)
+{
+ struct cxl_ctx *ctx = memdev->ctx;
+
+ return list_next(&ctx->memdevs, memdev, list);
+}
+
+CXL_EXPORT int cxl_memdev_get_id(struct cxl_memdev *memdev)
+{
+ return memdev->id;
+}
+
+CXL_EXPORT const char *cxl_memdev_get_devname(struct cxl_memdev *memdev)
+{
+ return devpath_to_devname(memdev->dev_path);
+}
+
+CXL_EXPORT int cxl_memdev_get_major(struct cxl_memdev *memdev)
+{
+ return memdev->major;
+}
+
+CXL_EXPORT int cxl_memdev_get_minor(struct cxl_memdev *memdev)
+{
+ return memdev->minor;
+}
+
+CXL_EXPORT unsigned long long cxl_memdev_get_pmem_size(struct cxl_memdev *memdev)
+{
+ return memdev->pmem_size;
+}
+
+CXL_EXPORT unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev)
+{
+ return memdev->ram_size;
+}
diff --git a/cxl/builtin.h b/cxl/builtin.h
new file mode 100644
index 0000000..3797f98
--- /dev/null
+++ b/cxl/builtin.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020-2021 Intel Corporation. All rights reserved. */
+#ifndef _CXL_BUILTIN_H_
+#define _CXL_BUILTIN_H_
+
+struct cxl_ctx;
+int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx);
+#endif /* _CXL_BUILTIN_H_ */
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
new file mode 100644
index 0000000..8ee6873
--- /dev/null
+++ b/cxl/libcxl.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/* Copyright (C) 2020-2021, Intel Corporation. All rights reserved. */
+#ifndef _LIBCXL_H_
+#define _LIBCXL_H_
+
+#include <stdarg.h>
+#include <unistd.h>
+
+#ifdef HAVE_UUID
+#include <uuid/uuid.h>
+#else
+typedef unsigned char uuid_t[16];
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct cxl_ctx;
+struct cxl_ctx *cxl_ref(struct cxl_ctx *ctx);
+void cxl_unref(struct cxl_ctx *ctx);
+int cxl_new(struct cxl_ctx **ctx);
+void cxl_set_log_fn(struct cxl_ctx *ctx,
+ void (*log_fn)(struct cxl_ctx *ctx, int priority,
+ const char *file, int line, const char *fn,
+ const char *format, va_list args));
+int cxl_get_log_priority(struct cxl_ctx *ctx);
+void cxl_set_log_priority(struct cxl_ctx *ctx, int priority);
+void cxl_set_userdata(struct cxl_ctx *ctx, void *userdata);
+void *cxl_get_userdata(struct cxl_ctx *ctx);
+
+struct cxl_memdev;
+struct cxl_memdev *cxl_memdev_get_first(struct cxl_ctx *ctx);
+struct cxl_memdev *cxl_memdev_get_next(struct cxl_memdev *memdev);
+int cxl_memdev_get_id(struct cxl_memdev *memdev);
+const char *cxl_memdev_get_devname(struct cxl_memdev *memdev);
+int cxl_memdev_get_major(struct cxl_memdev *memdev);
+int cxl_memdev_get_minor(struct cxl_memdev *memdev);
+struct cxl_ctx *cxl_memdev_get_ctx(struct cxl_memdev *memdev);
+unsigned long long cxl_memdev_get_pmem_size(struct cxl_memdev *memdev);
+unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev);
+
+#define cxl_memdev_foreach(ctx, memdev) \
+ for (memdev = cxl_memdev_get_first(ctx); \
+ memdev != NULL; \
+ memdev = cxl_memdev_get_next(memdev))
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif
diff --git a/util/filter.h b/util/filter.h
index 1e1a41c..9a80d65 100644
--- a/util/filter.h
+++ b/util/filter.h
@@ -29,6 +29,8 @@ struct daxctl_dev *util_daxctl_dev_filter(struct daxctl_dev *dev,
const char *ident);
struct daxctl_region *util_daxctl_region_filter(struct daxctl_region *region,
const char *ident);
+struct cxl_memdev *util_cxl_memdev_filter(struct cxl_memdev *memdev,
+ const char *ident);
enum ndctl_namespace_mode util_nsmode(const char *mode);
const char *util_nsmode_name(enum ndctl_namespace_mode mode);
diff --git a/util/json.h b/util/json.h
index 0f09e36..91918c8 100644
--- a/util/json.h
+++ b/util/json.h
@@ -55,4 +55,7 @@ struct json_object *util_dimm_health_to_json(struct ndctl_dimm *dimm);
struct json_object *util_dimm_firmware_to_json(struct ndctl_dimm *dimm,
unsigned long flags);
struct json_object *util_region_capabilities_to_json(struct ndctl_region *region);
+struct cxl_memdev;
+struct json_object *util_cxl_memdev_to_json(struct cxl_memdev *memdev,
+ unsigned long flags);
#endif /* __NDCTL_JSON_H__ */
diff --git a/util/main.h b/util/main.h
index c89a843..80b55c4 100644
--- a/util/main.h
+++ b/util/main.h
@@ -10,16 +10,19 @@
enum program {
PROG_NDCTL,
PROG_DAXCTL,
+ PROG_CXL,
};
struct ndctl_ctx;
struct daxctl_ctx;
+struct cxl_ctx;
struct cmd_struct {
const char *cmd;
union {
int (*n_fn)(int, const char **, struct ndctl_ctx *ctx);
int (*d_fn)(int, const char **, struct daxctl_ctx *ctx);
+ int (*c_fn)(int, const char **, struct cxl_ctx *ctx);
};
};
diff --git a/cxl/cxl.c b/cxl/cxl.c
new file mode 100644
index 0000000..ff43470
--- /dev/null
+++ b/cxl/cxl.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020-2021 Intel Corporation. All rights reserved.
+// Copyright (C) 2005 Andreas Ericsson. All rights reserved.
+
+/* originally copied from perf and git */
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <cxl/libcxl.h>
+#include <util/parse-options.h>
+#include <ccan/array_size/array_size.h>
+
+#include <util/strbuf.h>
+#include <util/util.h>
+#include <util/main.h>
+#include <cxl/builtin.h>
+
+const char cxl_usage_string[] = "cxl [--version] [--help] COMMAND [ARGS]";
+const char cxl_more_info_string[] =
+ "See 'cxl help COMMAND' for more information on a specific command.\n"
+ " cxl --list-cmds to see all available commands";
+
+static int cmd_version(int argc, const char **argv, struct cxl_ctx *ctx)
+{
+ printf("%s\n", VERSION);
+ return 0;
+}
+
+static int cmd_help(int argc, const char **argv, struct cxl_ctx *ctx)
+{
+ const char * const builtin_help_subcommands[] = {
+ "list", NULL,
+ };
+ struct option builtin_help_options[] = {
+ OPT_END(),
+ };
+ const char *builtin_help_usage[] = {
+ "cxl help [command]",
+ NULL
+ };
+
+ argc = parse_options_subcommand(argc, argv, builtin_help_options,
+ builtin_help_subcommands, builtin_help_usage, 0);
+
+ if (!argv[0]) {
+ printf("\n usage: %s\n\n", cxl_usage_string);
+ printf("\n %s\n\n", cxl_more_info_string);
+ return 0;
+ }
+
+ return help_show_man_page(argv[0], "cxl", "CXL_MAN_VIEWER");
+}
+
+static struct cmd_struct commands[] = {
+ { "version", .c_fn = cmd_version },
+ { "list", .c_fn = cmd_list },
+ { "help", .c_fn = cmd_help },
+};
+
+int main(int argc, const char **argv)
+{
+ struct cxl_ctx *ctx;
+ int rc;
+
+ /* Look for flags.. */
+ argv++;
+ argc--;
+ main_handle_options(&argv, &argc, cxl_usage_string, commands,
+ ARRAY_SIZE(commands));
+
+ if (argc > 0) {
+ if (!prefixcmp(argv[0], "--"))
+ argv[0] += 2;
+ } else {
+ /* The user didn't specify a command; give them help */
+ printf("\n usage: %s\n\n", cxl_usage_string);
+ printf("\n %s\n\n", cxl_more_info_string);
+ goto out;
+ }
+
+ rc = cxl_new(&ctx);
+ if (rc)
+ goto out;
+ main_handle_internal_command(argc, argv, ctx, commands,
+ ARRAY_SIZE(commands), PROG_CXL);
+ cxl_unref(ctx);
+ fprintf(stderr, "Unknown command: '%s'\n", argv[0]);
+out:
+ return 1;
+}
diff --git a/cxl/list.c b/cxl/list.c
new file mode 100644
index 0000000..3d44244
--- /dev/null
+++ b/cxl/list.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2020-2021 Intel Corporation. All rights reserved.
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <util/json.h>
+#include <util/filter.h>
+#include <json-c/json.h>
+#include <cxl/libcxl.h>
+#include <util/parse-options.h>
+#include <ccan/array_size/array_size.h>
+
+static struct {
+ bool memdevs;
+ bool idle;
+ bool human;
+} list;
+
+static unsigned long listopts_to_flags(void)
+{
+ unsigned long flags = 0;
+
+ if (list.idle)
+ flags |= UTIL_JSON_IDLE;
+ if (list.human)
+ flags |= UTIL_JSON_HUMAN;
+ return flags;
+}
+
+static struct {
+ const char *memdev;
+} param;
+
+static int did_fail;
+
+#define fail(fmt, ...) \
+do { \
+ did_fail = 1; \
+ fprintf(stderr, "cxl-%s:%s:%d: " fmt, \
+ VERSION, __func__, __LINE__, ##__VA_ARGS__); \
+} while (0)
+
+static int num_list_flags(void)
+{
+ return list.memdevs;
+}
+
+int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
+{
+ const struct option options[] = {
+ OPT_STRING('d', "memdev", ¶m.memdev, "memory device name",
+ "filter by CXL memory device name"),
+ OPT_BOOLEAN('D', "memdevs", &list.memdevs,
+ "include CXL memory device info"),
+ OPT_BOOLEAN('i', "idle", &list.idle, "include idle devices"),
+ OPT_BOOLEAN('u', "human", &list.human,
+ "use human friendly number formats "),
+ OPT_END(),
+ };
+ const char * const u[] = {
+ "cxl list [<options>]",
+ NULL
+ };
+ struct json_object *jdevs = NULL;
+ unsigned long list_flags;
+ struct cxl_memdev *memdev;
+ int i;
+
+ argc = parse_options(argc, argv, options, u, 0);
+ for (i = 0; i < argc; i++)
+ error("unknown parameter \"%s\"\n", argv[i]);
+
+ if (argc)
+ usage_with_options(u, options);
+
+ if (num_list_flags() == 0)
+ list.memdevs = true;
+
+ list_flags = listopts_to_flags();
+
+ cxl_memdev_foreach(ctx, memdev) {
+ struct json_object *jdev = NULL;
+
+ if (!util_cxl_memdev_filter(memdev, param.memdev))
+ continue;
+
+ if (list.memdevs) {
+ if (!jdevs) {
+ jdevs = json_object_new_array();
+ if (!jdevs) {
+ fail("\n");
+ continue;
+ }
+ }
+
+ jdev = util_cxl_memdev_to_json(memdev, list_flags);
+ if (!jdev) {
+ fail("\n");
+ continue;
+ }
+ json_object_array_add(jdevs, jdev);
+ }
+ }
+
+ if (jdevs)
+ util_display_json_array(stdout, jdevs, list_flags);
+
+ if (did_fail)
+ return -ENOMEM;
+ return 0;
+}
diff --git a/util/filter.c b/util/filter.c
index 8b4aad3..d81dade 100644
--- a/util/filter.c
+++ b/util/filter.c
@@ -12,6 +12,7 @@
#include <util/filter.h>
#include <ndctl/libndctl.h>
#include <daxctl/libdaxctl.h>
+#include <cxl/libcxl.h>
struct ndctl_bus *util_bus_filter(struct ndctl_bus *bus, const char *__ident)
{
@@ -339,6 +340,25 @@ struct daxctl_region *util_daxctl_region_filter(struct daxctl_region *region,
return NULL;
}
+struct cxl_memdev *util_cxl_memdev_filter(struct cxl_memdev *memdev,
+ const char *ident)
+{
+ int memdev_id;
+
+ if (!ident || strcmp(ident, "all") == 0)
+ return memdev;
+
+ if (strcmp(ident, cxl_memdev_get_devname(memdev)) == 0)
+ return memdev;
+
+ if ((sscanf(ident, "%d", &memdev_id) == 1
+ || sscanf(ident, "mem%d", &memdev_id) == 1)
+ && cxl_memdev_get_id(memdev) == memdev_id)
+ return memdev;
+
+ return NULL;
+}
+
enum ndctl_namespace_mode util_nsmode(const char *mode)
{
if (!mode)
diff --git a/util/json.c b/util/json.c
index ca0167b..a855571 100644
--- a/util/json.c
+++ b/util/json.c
@@ -9,6 +9,7 @@
#include <json-c/printbuf.h>
#include <ndctl/libndctl.h>
#include <daxctl/libdaxctl.h>
+#include <cxl/libcxl.h>
#include <ccan/array_size/array_size.h>
#include <ccan/short_types/short_types.h>
#include <ndctl.h>
@@ -1429,3 +1430,28 @@ struct json_object *util_badblock_rec_to_json(u64 block, u64 count,
json_object_put(jerr);
return NULL;
}
+
+struct json_object *util_cxl_memdev_to_json(struct cxl_memdev *memdev,
+ unsigned long flags)
+{
+ const char *devname = cxl_memdev_get_devname(memdev);
+ struct json_object *jdev, *jobj;
+
+ jdev = json_object_new_object();
+ if (!devname || !jdev)
+ return NULL;
+
+ jobj = json_object_new_string(devname);
+ if (jobj)
+ json_object_object_add(jdev, "memdev", jobj);
+
+ jobj = util_json_object_size(cxl_memdev_get_pmem_size(memdev), flags);
+ if (jobj)
+ json_object_object_add(jdev, "pmem_size", jobj);
+
+ jobj = util_json_object_size(cxl_memdev_get_ram_size(memdev), flags);
+ if (jobj)
+ json_object_object_add(jdev, "ram_size", jobj);
+
+ return jdev;
+}
diff --git a/Documentation/cxl/Makefile.am b/Documentation/cxl/Makefile.am
new file mode 100644
index 0000000..2023f55
--- /dev/null
+++ b/Documentation/cxl/Makefile.am
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2015-2020 Intel Corporation. All rights reserved.
+
+if USE_ASCIIDOCTOR
+
+do_subst = sed -e 's,@Utility@,Cxl,g' -e's,@utility@,cxl,g'
+CONFFILE = asciidoctor-extensions.rb
+asciidoctor-extensions.rb: ../asciidoctor-extensions.rb.in
+ $(AM_V_GEN) $(do_subst) < $< > $@
+
+else
+
+do_subst = sed -e 's,UTILITY,cxl,g'
+CONFFILE = asciidoc.conf
+asciidoc.conf: ../asciidoc.conf.in
+ $(AM_V_GEN) $(do_subst) < $< > $@
+
+endif
+
+man1_MANS = \
+ cxl.1 \
+ cxl-list.1
+
+EXTRA_DIST = $(man1_MANS)
+
+CLEANFILES = $(man1_MANS)
+
+XML_DEPS = \
+ ../../version.m4 \
+ ../copyright.txt \
+ Makefile \
+ $(CONFFILE)
+
+RM ?= rm -f
+
+if USE_ASCIIDOCTOR
+
+%.1: %.txt $(XML_DEPS)
+ $(AM_V_GEN)$(RM) $@+ $@ && \
+ $(ASCIIDOC) -b manpage -d manpage -acompat-mode \
+ -I. -rasciidoctor-extensions \
+ -amansource=cxl -amanmanual="cxl Manual" \
+ -andctl_version=$(VERSION) -o $@+ $< && \
+ mv $@+ $@
+
+else
+
+%.xml: %.txt $(XML_DEPS)
+ $(AM_V_GEN)$(RM) $@+ $@ && \
+ $(ASCIIDOC) -b docbook -d manpage -f asciidoc.conf \
+ --unsafe -acxl_version=$(VERSION) -o $@+ $< && \
+ mv $@+ $@
+
+%.1: %.xml $(XML_DEPS)
+ $(AM_V_GEN)$(RM) $@ && \
+ $(XMLTO) -o . -m ../manpage-normal.xsl man $<
+
+endif
diff --git a/cxl/Makefile.am b/cxl/Makefile.am
new file mode 100644
index 0000000..98606b9
--- /dev/null
+++ b/cxl/Makefile.am
@@ -0,0 +1,21 @@
+include $(top_srcdir)/Makefile.am.in
+
+bin_PROGRAMS = cxl
+
+DISTCLEANFILES = config.h
+BUILT_SOURCES = config.h
+config.h: $(srcdir)/Makefile.am
+ $(AM_V_GEN) echo "/* Autogenerated by cxl/Makefile.am */" >$@
+
+cxl_SOURCES =\
+ cxl.c \
+ list.c \
+ ../util/json.c \
+ builtin.h
+
+cxl_LDADD =\
+ lib/libcxl.la \
+ ../libutil.a \
+ $(UUID_LIBS) \
+ $(KMOD_LIBS) \
+ $(JSON_LIBS)
diff --git a/cxl/lib/Makefile.am b/cxl/lib/Makefile.am
new file mode 100644
index 0000000..01adf9f
--- /dev/null
+++ b/cxl/lib/Makefile.am
@@ -0,0 +1,32 @@
+include $(top_srcdir)/Makefile.am.in
+
+%.pc: %.pc.in Makefile
+ $(SED_PROCESS)
+
+pkginclude_HEADERS = ../libcxl.h
+lib_LTLIBRARIES = libcxl.la
+
+libcxl_la_SOURCES =\
+ ../libcxl.h \
+ libcxl-private.h \
+ ../../util/sysfs.c \
+ ../../util/sysfs.h \
+ ../../util/log.c \
+ ../../util/log.h \
+ libcxl.c
+
+libcxl_la_LIBADD =\
+ $(UUID_LIBS) \
+ $(KMOD_LIBS)
+
+EXTRA_DIST += libcxl.sym
+
+libcxl_la_LDFLAGS = $(AM_LDFLAGS) \
+ -version-info $(LIBCXL_CURRENT):$(LIBCXL_REVISION):$(LIBCXL_AGE) \
+ -Wl,--version-script=$(top_srcdir)/cxl/lib/libcxl.sym
+libcxl_la_DEPENDENCIES = libcxl.sym
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libcxl.pc
+EXTRA_DIST += libcxl.pc.in
+CLEANFILES += libcxl.pc
diff --git a/cxl/lib/libcxl.pc.in b/cxl/lib/libcxl.pc.in
new file mode 100644
index 0000000..949fcdc
--- /dev/null
+++ b/cxl/lib/libcxl.pc.in
@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libcxl
+Description: Manage CXL devices
+Version: @VERSION@
+Libs: -L${libdir} -lcxl
+Libs.private:
+Cflags: -I${includedir}
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
new file mode 100644
index 0000000..9bbbeb4
--- /dev/null
+++ b/cxl/lib/libcxl.sym
@@ -0,0 +1,26 @@
+LIBCXL_1 {
+global:
+ cxl_get_userdata;
+ cxl_set_userdata;
+ cxl_ref;
+ cxl_get_log_priority;
+ cxl_set_log_fn;
+ cxl_unref;
+ cxl_set_log_priority;
+ cxl_new;
+local:
+ *;
+};
+
+LIBCXL_2 {
+global:
+ cxl_memdev_get_first;
+ cxl_memdev_get_next;
+ cxl_memdev_get_id;
+ cxl_memdev_get_devname;
+ cxl_memdev_get_major;
+ cxl_memdev_get_minor;
+ cxl_memdev_get_ctx;
+ cxl_memdev_get_pmem_size;
+ cxl_memdev_get_ram_size;
+} LIBCXL_1;
--
2.29.2
_______________________________________________
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [ndctl RFC PATCH 3/5] libcxl: add support for command query and submission
2021-01-12 0:33 [ndctl RFC PATCH 0/5] Initial CXL support Vishal Verma
2021-01-12 0:33 ` [ndctl RFC PATCH 1/5] cxl: add a cxl utility and libcxl library Vishal Verma
2021-01-12 0:34 ` [ndctl RFC PATCH 2/5] cxl: add a local copy of the cxl_mem UAPI header Vishal Verma
@ 2021-01-12 0:34 ` Vishal Verma
2021-01-12 0:34 ` [ndctl RFC PATCH 4/5] libcxl: add accessors for retrieving 'Identify' information Vishal Verma
2021-01-12 0:34 ` [ndctl RFC PATCH 5/5] cxl/list: augment cxl-list with more data from the identify command Vishal Verma
4 siblings, 0 replies; 6+ messages in thread
From: Vishal Verma @ 2021-01-12 0:34 UTC (permalink / raw)
To: linux-cxl; +Cc: linux-nvdimm, Ben Widawsky
Add a set of APIs around 'cxl_cmd' for querying the kernel for supported
commands, allocating and validating command structures against the
supported set, and submitting the commands.
'Query Commands' and 'Send Command' are implemented as IOCTLs in the
kernel. 'Query Commands' returns information about each supported
command, such as flags governing its use, or input and output payload
sizes. This information is used to validate command support, as well as
set up input and output buffers for the actual command submission.
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
cxl/lib/private.h | 40 ++++++
cxl/lib/libcxl.c | 352 +++++++++++++++++++++++++++++++++++++++++++++
cxl/libcxl.h | 11 ++
cxl/lib/libcxl.sym | 12 ++
4 files changed, 415 insertions(+)
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index f787512..c7ebfcb 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -4,6 +4,9 @@
#define _LIBCXL_PRIVATE_H_
#include <libkmod.h>
+#include <cxl_mem.h>
+#include <ccan/endian/endian.h>
+#include <ccan/short_types/short_types.h>
#define CXL_EXPORT __attribute__ ((visibility("default")))
@@ -20,6 +23,43 @@ struct cxl_memdev {
struct kmod_module *module;
};
+#undef C
+#define C(a, b) { b }
+static struct {
+ const char *name;
+} command_names[] = { CMDS };
+#undef C
+
+enum cxl_cmd_query_status {
+ CXL_CMD_QUERY_NOT_RUN = 0,
+ CXL_CMD_QUERY_OK,
+ CXL_CMD_QUERY_UNSUPPORTED,
+};
+
+/**
+ * struct cxl_cmd - CXL memdev command
+ * @memdev: the memory device to which the command is being sent
+ * @query_cmd: structure for the Linux 'Query commands' ioctl
+ * @send_cmd: structure for the Linux 'Send command' ioctl
+ * @input_payload: buffer for any input payload
+ * @output_payload: buffer for any output payload
+ * @refcount: reference for passing command buffer around
+ * @query_status: status from query_commands
+ * @query_status: status from query_commands
+ * @status: command return status from the device
+ */
+struct cxl_cmd {
+ struct cxl_memdev *memdev;
+ struct cxl_mem_query_commands *query_cmd;
+ struct cxl_send_command *send_cmd;
+ void *input_payload;
+ void *output_payload;
+ int refcount;
+ int query_status;
+ int query_idx;
+ int status;
+};
+
static inline int check_kmod(struct kmod_ctx *kmod_ctx)
{
return kmod_ctx ? 0 : -ENXIO;
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index c864208..02bc316 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -9,13 +9,16 @@
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/ioctl.h>
#include <sys/sysmacros.h>
#include <uuid/uuid.h>
#include <ccan/list/list.h>
#include <ccan/array_size/array_size.h>
+#include <cxl_mem.h>
#include <util/log.h>
#include <util/sysfs.h>
+#include <util/bitmap.h>
#include <cxl/libcxl.h>
#include "private.h"
@@ -316,3 +319,352 @@ CXL_EXPORT unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev)
{
return memdev->ram_size;
}
+
+CXL_EXPORT void cxl_cmd_unref(struct cxl_cmd *cmd)
+{
+ if (!cmd)
+ return;
+ if (--cmd->refcount == 0) {
+ free(cmd->query_cmd);
+ free(cmd->send_cmd);
+ free(cmd->input_payload);
+ free(cmd->output_payload);
+ free(cmd);
+ }
+}
+
+CXL_EXPORT void cxl_cmd_ref(struct cxl_cmd *cmd)
+{
+ cmd->refcount++;
+}
+
+static int cxl_cmd_alloc_query(struct cxl_cmd *cmd, int num_cmds)
+{
+ struct cxl_mem_query_commands *qcmd;
+ size_t size;
+
+ if (!cmd)
+ return -EINVAL;
+
+ if (cmd->query_cmd != NULL)
+ free(cmd->query_cmd);
+
+ size = sizeof(struct cxl_mem_query_commands) +
+ (num_cmds * sizeof(struct cxl_command_info));
+ cmd->query_cmd = calloc(1, size);
+ if (!cmd->query_cmd)
+ return -ENOMEM;
+
+ qcmd = cmd->query_cmd;
+ qcmd->n_commands = num_cmds;
+
+ return 0;
+}
+
+static struct cxl_cmd *cxl_cmd_new(struct cxl_memdev *memdev)
+{
+ struct cxl_cmd *cmd;
+ size_t size;
+
+ size = sizeof(*cmd);
+ cmd = calloc(1, size);
+ if (!cmd)
+ return NULL;
+
+ cxl_cmd_ref(cmd);
+ cmd->memdev = memdev;
+
+ return cmd;
+}
+
+static int __do_cmd(struct cxl_cmd *cmd, int ioctl_cmd, int fd)
+{
+ struct cxl_memdev *memdev = cmd->memdev;
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ const char *devname = cxl_memdev_get_devname(memdev);
+ char *cmd_name;
+ void *cmd_buf;
+ int rc;
+
+ switch (ioctl_cmd) {
+ case CXL_MEM_QUERY_COMMANDS:
+ cmd_buf = cmd->query_cmd;
+ cmd_name = "query";
+ break;
+ case CXL_MEM_SEND_COMMAND:
+ cmd_buf = cmd->send_cmd;
+ cmd_name = "send";
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ rc = ioctl(fd, ioctl_cmd, cmd_buf);
+ if (rc < 0)
+ rc = -errno;
+
+ info(ctx, "%s: cmd: %s, status: %s\n", devname,
+ cmd_name, (rc < 0) ? strerror(-rc) : "success");
+
+ return rc;
+}
+
+static int do_cmd(struct cxl_cmd *cmd, int ioctl_cmd)
+{
+ char path[20];
+ struct stat st;
+ unsigned int major, minor;
+ int rc = 0, fd, len = sizeof(path);
+ struct cxl_memdev *memdev = cmd->memdev;
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ const char *devname = cxl_memdev_get_devname(memdev);
+
+ major = cxl_memdev_get_major(memdev);
+ minor = cxl_memdev_get_minor(memdev);
+
+ if (snprintf(path, len, "/dev/cxl/%s", devname) >= len) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ fd = open(path, O_RDWR);
+ if (fd < 0) {
+ err(ctx, "failed to open %s: %s\n", path, strerror(errno));
+ rc = -errno;
+ goto out;
+ }
+
+ if (fstat(fd, &st) >= 0 && S_ISCHR(st.st_mode)
+ && major(st.st_rdev) == major
+ && minor(st.st_rdev) == minor) {
+ rc = __do_cmd(cmd, ioctl_cmd, fd);
+ } else {
+ err(ctx, "failed to validate %s as a CXL memdev node\n", path);
+ rc = -ENXIO;
+ }
+ close(fd);
+ out:
+ return rc;
+}
+
+static int alloc_do_query(struct cxl_cmd *cmd, int num_cmds)
+{
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(cmd->memdev);
+ int rc;
+
+ rc = cxl_cmd_alloc_query(cmd, num_cmds);
+ if (rc)
+ return rc;
+
+ rc = do_cmd(cmd, CXL_MEM_QUERY_COMMANDS);
+ if (rc < 0)
+ err(ctx, "%s: query commands failed: %s\n",
+ cxl_memdev_get_devname(cmd->memdev),
+ strerror(-rc));
+ return rc;
+}
+
+static int cxl_cmd_do_query(struct cxl_cmd *cmd)
+{
+ struct cxl_memdev *memdev = cmd->memdev;
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ const char *devname = cxl_memdev_get_devname(memdev);
+ int rc, n_commands;
+
+ switch (cmd->query_status) {
+ case CXL_CMD_QUERY_OK:
+ return 0;
+ case CXL_CMD_QUERY_UNSUPPORTED:
+ return -EOPNOTSUPP;
+ case CXL_CMD_QUERY_NOT_RUN:
+ break;
+ default:
+ err(ctx, "%s: Unknown query_status %d\n",
+ devname, cmd->query_status);
+ return -EINVAL;
+ }
+
+ rc = alloc_do_query(cmd, 0);
+ if (rc)
+ return rc;
+
+ n_commands = cmd->query_cmd->n_commands;
+ dbg(ctx, "%s: supports %d commands\n", devname, n_commands);
+
+ return alloc_do_query(cmd, n_commands);
+}
+
+static int cxl_cmd_validate(struct cxl_cmd *cmd, u32 cmd_id)
+{
+ struct cxl_memdev *memdev = cmd->memdev;
+ struct cxl_mem_query_commands *query = cmd->query_cmd;
+ const char *devname = cxl_memdev_get_devname(memdev);
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ u32 i;
+
+ for (i = 0; i < query->n_commands; i++) {
+ struct cxl_command_info *cinfo = &query->commands[i];
+ const char *cmd_name = command_names[cinfo->id].name;
+
+ if (cinfo->id != cmd_id)
+ continue;
+
+ dbg(ctx, "%s: %s: in: %d, out %d, flags: %#08x\n",
+ devname, cmd_name, cinfo->size_in,
+ cinfo->size_out, cinfo->flags);
+
+ if (cinfo->flags & CXL_MEM_COMMAND_FLAG_KERNEL) {
+ err(ctx, "%s: %s: reserved for kernel use\n",
+ devname, cmd_name);
+ return -EPERM;
+ }
+ cmd->query_idx = i;
+ cmd->query_status = CXL_CMD_QUERY_OK;
+ return 0;
+ }
+ cmd->query_status = CXL_CMD_QUERY_UNSUPPORTED;
+ return -EOPNOTSUPP;
+}
+
+CXL_EXPORT int cxl_cmd_attach_payloads(struct cxl_cmd *cmd,
+ void *in, int size_in,
+ void *out, int size_out)
+{
+ struct cxl_memdev *memdev = cmd->memdev;
+
+ if (size_in > memdev->payload_max || size_out > memdev->payload_max)
+ return -EINVAL;
+
+ if (size_in > 0) {
+ cmd->send_cmd->in_payload = (u64)in;
+ cmd->send_cmd->size_in = size_in;
+ }
+ if (size_out > 0) {
+ cmd->send_cmd->out_payload = (u64)out;
+ cmd->send_cmd->size_out = size_out;
+ }
+
+ return 0;
+}
+
+static int cxl_cmd_alloc_send(struct cxl_cmd *cmd, u32 cmd_id)
+{
+ struct cxl_mem_query_commands *query = cmd->query_cmd;
+ struct cxl_command_info *cinfo = &query->commands[cmd->query_idx];
+ size_t size;
+
+ if (!query)
+ return -EINVAL;
+
+ size = sizeof(struct cxl_send_command);
+ cmd->send_cmd = calloc(1, size);
+ if (!cmd->send_cmd)
+ return -ENOMEM;
+
+ if (cinfo->id != cmd_id)
+ return -EINVAL;
+
+ cmd->send_cmd->id = cmd_id;
+
+ if (cinfo->size_in > 0) {
+ cmd->input_payload = calloc(1, cinfo->size_in);
+ if (!cmd->input_payload)
+ return -ENOMEM;
+ }
+ if (cinfo->size_out > 0) {
+ cmd->output_payload = calloc(1, cinfo->size_out);
+ if (!cmd->output_payload)
+ return -ENOMEM;
+ }
+ cxl_cmd_attach_payloads(cmd, cmd->input_payload, cinfo->size_in,
+ cmd->output_payload, cinfo->size_out);
+
+ return 0;
+}
+
+static struct cxl_cmd *cxl_cmd_new_generic(struct cxl_memdev *memdev,
+ u32 cmd_id)
+{
+ const char *devname = cxl_memdev_get_devname(memdev);
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ struct cxl_cmd *cmd;
+ int rc;
+
+ cmd = cxl_cmd_new(memdev);
+ if (!cmd)
+ return NULL;
+
+ rc = cxl_cmd_do_query(cmd);
+ if (rc) {
+ err(ctx, "%s: query returned: %s\n", devname, strerror(-rc));
+ goto fail;
+ }
+
+ rc = cxl_cmd_validate(cmd, cmd_id);
+ if (rc) {
+ errno = -rc;
+ goto fail;
+ }
+
+ rc = cxl_cmd_alloc_send(cmd, cmd_id);
+ if (rc) {
+ errno = -rc;
+ goto fail;
+ }
+
+ return cmd;
+
+fail:
+ cxl_cmd_unref(cmd);
+ return NULL;
+}
+
+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_identify(struct cxl_memdev *memdev)
+{
+ return cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_IDENTIFY);
+}
+
+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_raw(struct cxl_memdev *memdev)
+{
+ return cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_RAW);
+}
+
+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_get_supported_logs(
+ struct cxl_memdev *memdev)
+{
+ return cxl_cmd_new_generic(memdev,
+ CXL_MEM_COMMAND_ID_GET_SUPPORTED_LOGS);
+}
+
+CXL_EXPORT struct cxl_cmd *cxl_cmd_new_get_log(struct cxl_memdev *memdev)
+{
+ return cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_GET_LOG);
+}
+
+CXL_EXPORT int cxl_cmd_submit(struct cxl_cmd *cmd)
+{
+ struct cxl_memdev *memdev = cmd->memdev;
+ const char *devname = cxl_memdev_get_devname(memdev);
+ struct cxl_ctx *ctx = cxl_memdev_get_ctx(memdev);
+ int rc;
+
+ switch (cmd->query_status) {
+ case CXL_CMD_QUERY_OK:
+ break;
+ case CXL_CMD_QUERY_UNSUPPORTED:
+ return -EOPNOTSUPP;
+ case CXL_CMD_QUERY_NOT_RUN:
+ return -EINVAL;
+ default:
+ err(ctx, "%s: Unknown query_status %d\n",
+ devname, cmd->query_status);
+ return -EINVAL;
+ }
+
+ rc = do_cmd(cmd, CXL_MEM_SEND_COMMAND);
+ if (rc < 0)
+ err(ctx, "%s: send command failed: %s\n",
+ devname, strerror(-rc));
+ cmd->status = cmd->send_cmd->retval;
+ return rc;
+}
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index 8ee6873..83888bc 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -45,6 +45,17 @@ unsigned long long cxl_memdev_get_ram_size(struct cxl_memdev *memdev);
memdev != NULL; \
memdev = cxl_memdev_get_next(memdev))
+struct cxl_cmd;
+struct cxl_cmd *cxl_cmd_new_identify(struct cxl_memdev *memdev);
+struct cxl_cmd *cxl_cmd_new_raw(struct cxl_memdev *memdev);
+struct cxl_cmd *cxl_cmd_new_get_supported_logs(struct cxl_memdev *memdev);
+struct cxl_cmd *cxl_cmd_new_get_log(struct cxl_memdev *memdev);
+int cxl_cmd_attach_payloads(struct cxl_cmd *cmd,
+ void *in, int size_in, void *out, int size_out);
+void cxl_cmd_ref(struct cxl_cmd *cmd);
+void cxl_cmd_unref(struct cxl_cmd *cmd);
+int cxl_cmd_submit(struct cxl_cmd *cmd);
+
#ifdef __cplusplus
} /* extern "C" */
#endif
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 9bbbeb4..3583bab 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -24,3 +24,15 @@ global:
cxl_memdev_get_pmem_size;
cxl_memdev_get_ram_size;
} LIBCXL_1;
+
+LIBCXL_3 {
+global:
+ cxl_cmd_new_identify;
+ cxl_cmd_new_raw;
+ cxl_cmd_new_get_supported_logs;
+ cxl_cmd_new_get_log;
+ cxl_cmd_attach_payloads;
+ cxl_cmd_ref;
+ cxl_cmd_unref;
+ cxl_cmd_submit;
+} LIBCXL_2;
--
2.29.2
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [ndctl RFC PATCH 5/5] cxl/list: augment cxl-list with more data from the identify command
2021-01-12 0:33 [ndctl RFC PATCH 0/5] Initial CXL support Vishal Verma
` (3 preceding siblings ...)
2021-01-12 0:34 ` [ndctl RFC PATCH 4/5] libcxl: add accessors for retrieving 'Identify' information Vishal Verma
@ 2021-01-12 0:34 ` Vishal Verma
4 siblings, 0 replies; 6+ messages in thread
From: Vishal Verma @ 2021-01-12 0:34 UTC (permalink / raw)
To: linux-cxl; +Cc: linux-nvdimm, Ben Widawsky
Augment cxl-list with some more fields obtained from sending an
'Identify' command to the device. If/when these fields are added to the
sysfs representation of the memdev, the command submission detour can be
removed and replaced with data from sysfs.
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
util/json.h | 3 ++-
cxl/list.c | 29 +++++++++++++++++++++++++++--
util/json.c | 22 +++++++++++++++++++++-
3 files changed, 50 insertions(+), 4 deletions(-)
diff --git a/util/json.h b/util/json.h
index 91918c8..831f9bb 100644
--- a/util/json.h
+++ b/util/json.h
@@ -6,6 +6,7 @@
#include <stdbool.h>
#include <ndctl/libndctl.h>
#include <daxctl/libdaxctl.h>
+#include <cxl/libcxl.h>
#include <ccan/short_types/short_types.h>
enum util_json_flags {
@@ -57,5 +58,5 @@ struct json_object *util_dimm_firmware_to_json(struct ndctl_dimm *dimm,
struct json_object *util_region_capabilities_to_json(struct ndctl_region *region);
struct cxl_memdev;
struct json_object *util_cxl_memdev_to_json(struct cxl_memdev *memdev,
- unsigned long flags);
+ struct cxl_cmd *id, unsigned long flags);
#endif /* __NDCTL_JSON_H__ */
diff --git a/cxl/list.c b/cxl/list.c
index 3d44244..7afe2b4 100644
--- a/cxl/list.c
+++ b/cxl/list.c
@@ -5,6 +5,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
+#include <util/log.h>
#include <util/json.h>
#include <util/filter.h>
#include <json-c/json.h>
@@ -16,6 +17,7 @@ static struct {
bool memdevs;
bool idle;
bool human;
+ bool verbose;
} list;
static unsigned long listopts_to_flags(void)
@@ -47,6 +49,19 @@ static int num_list_flags(void)
return list.memdevs;
}
+struct cxl_cmd *memdev_identify(struct cxl_memdev *memdev)
+{
+ struct cxl_cmd *id;
+
+ id = cxl_cmd_new_identify(memdev);
+ if (!id)
+ return NULL;
+
+ if (cxl_cmd_submit(id) != 0)
+ return NULL;
+ return id;
+}
+
int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
{
const struct option options[] = {
@@ -56,7 +71,9 @@ int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
"include CXL memory device info"),
OPT_BOOLEAN('i', "idle", &list.idle, "include idle devices"),
OPT_BOOLEAN('u', "human", &list.human,
- "use human friendly number formats "),
+ "use human friendly number formats"),
+ OPT_BOOLEAN('v', "verbose", &list.verbose,
+ "enable verbose output"),
OPT_END(),
};
const char * const u[] = {
@@ -80,27 +97,35 @@ int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
list_flags = listopts_to_flags();
+ if (list.verbose)
+ cxl_set_log_priority(ctx, LOG_DEBUG);
+
cxl_memdev_foreach(ctx, memdev) {
struct json_object *jdev = NULL;
+ struct cxl_cmd *id;
if (!util_cxl_memdev_filter(memdev, param.memdev))
continue;
if (list.memdevs) {
+ id = memdev_identify(memdev);
if (!jdevs) {
jdevs = json_object_new_array();
if (!jdevs) {
fail("\n");
+ cxl_cmd_unref(id);
continue;
}
}
- jdev = util_cxl_memdev_to_json(memdev, list_flags);
+ jdev = util_cxl_memdev_to_json(memdev, id, list_flags);
if (!jdev) {
fail("\n");
+ cxl_cmd_unref(id);
continue;
}
json_object_array_add(jdevs, jdev);
+ cxl_cmd_unref(id);
}
}
diff --git a/util/json.c b/util/json.c
index a855571..24d4477 100644
--- a/util/json.c
+++ b/util/json.c
@@ -1432,10 +1432,11 @@ struct json_object *util_badblock_rec_to_json(u64 block, u64 count,
}
struct json_object *util_cxl_memdev_to_json(struct cxl_memdev *memdev,
- unsigned long flags)
+ struct cxl_cmd *id, unsigned long flags)
{
const char *devname = cxl_memdev_get_devname(memdev);
struct json_object *jdev, *jobj;
+ char fw_rev[0x10];
jdev = json_object_new_object();
if (!devname || !jdev)
@@ -1453,5 +1454,24 @@ struct json_object *util_cxl_memdev_to_json(struct cxl_memdev *memdev,
if (jobj)
json_object_object_add(jdev, "ram_size", jobj);
+ if (!id)
+ return jdev;
+
+ if (cxl_cmd_identify_get_fw_rev(id, fw_rev, 0x10) == 0) {
+ jobj = json_object_new_string(fw_rev);
+ if (jobj)
+ json_object_object_add(jdev, "fw_revision", jobj);
+ }
+
+ jobj = util_json_object_size(cxl_cmd_identify_get_partition_align(id),
+ flags);
+ if (jobj)
+ json_object_object_add(jdev, "partition_align", jobj);
+
+ jobj = util_json_object_size(cxl_cmd_identify_get_lsa_size(id),
+ flags);
+ if (jobj)
+ json_object_object_add(jdev, "lsa_size", jobj);
+
return jdev;
}
--
2.29.2
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^ permalink raw reply related [flat|nested] 6+ messages in thread