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From 46564977afb733a92526c688fe106e19b139ddfc Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Sun, 23 Jan 2022 16:54:27 -0800
Subject: [PATCH 116/217] cxl/list: Add decoder support
Decoder objects exist at each level of a CXL port topology and map a
physical address range a set of interleaved ports at each level of the
hierarchy. Typically end users mostly care about the root-level decoders
which enumerate the potential CXL address space in the system, and the
endpoint decoders that indicate which address ranges a given device
contributes resources. Intermediate switch-level decoders are typically
only useful for debugging decode problems.
$ cxl list -D -d 3.1 -u
{
"decoder":"decoder3.1",
"resource":"0x8030000000",
"size":"512.00 MiB (536.87 MB)",
"volatile_capable":true
}
Link: https://lore.kernel.org/r/164298566760.3021641.3999006903066004615.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
.clang-format | 1 +
Documentation/cxl/cxl-list.txt | 18 ++-
Documentation/cxl/lib/libcxl.txt | 70 ++++++++-
cxl/filter.c | 194 +++++++++++++++++++++++--
cxl/filter.h | 2 +
cxl/json.c | 62 ++++++++
cxl/json.h | 2 +
cxl/lib/libcxl.c | 239 ++++++++++++++++++++++++++++---
cxl/lib/libcxl.sym | 14 ++
cxl/lib/private.h | 31 +++-
cxl/libcxl.h | 28 ++++
cxl/list.c | 9 +-
util/json.h | 1 +
13 files changed, 643 insertions(+), 28 deletions(-)
diff --git a/.clang-format b/.clang-format
index 106bc5e..16e28ac 100644
--- a/.clang-format
+++ b/.clang-format
@@ -80,6 +80,7 @@ ForEachMacros:
- 'cxl_memdev_foreach'
- 'cxl_bus_foreach'
- 'cxl_port_foreach'
+ - 'cxl_decoder_foreach'
- 'cxl_endpoint_foreach'
- 'daxctl_dev_foreach'
- 'daxctl_mapping_foreach'
diff --git a/Documentation/cxl/cxl-list.txt b/Documentation/cxl/cxl-list.txt
index bac27c7..84872b9 100644
--- a/Documentation/cxl/cxl-list.txt
+++ b/Documentation/cxl/cxl-list.txt
@@ -5,7 +5,7 @@ cxl-list(1)
NAME
----
-cxl-list - List CXL capable memory devices, and their attributes in json.
+cxl-list - List platform CXL objects, and their attributes, in json.
SYNOPSIS
--------
@@ -29,6 +29,10 @@ The potential top-level array names and their nesting properties are:
"endpoints":: nest under ports or buses (if ports are not emitted)
"memdevs":: nest under endpoints or ports (if endpoints are not
emitted) or buses (if endpoints and ports are not emitted)
+"root decoders":: nest under buses
+"port decoders":: nest under ports, or buses (if ports are not emitted)
+"endpoint decoders":: nest under endpoints, or ports (if endpoints are
+ not emitted) or buses (if endpoints and ports are not emitted)
Filters can by specifed as either a single identidier, a space separated
quoted string, or a comma separated list. When multiple filter
@@ -254,6 +258,18 @@ OPTIONS
Specify CXL endpoint device name(s), or device id(s) to filter
the emitted endpoint(s).
+-D::
+--decoders::
+ Include decoder objects (CXL Memory decode capability instances
+ in buses, ports, and endpoints) in the listing.
+
+-d::
+--decoder::
+ Specify CXL decoder device name(s), device id(s), or decoder type names
+ to filter the emitted decoder(s). The format for a decoder name is
+ "decoder<port_id>.<instance_id>". The possible decoder type names are
+ "root", "switch", or "endpoint", similar to the port filter syntax.
+
--debug::
If the cxl tool was built with debug enabled, turn on debug
messages.
diff --git a/Documentation/cxl/lib/libcxl.txt b/Documentation/cxl/lib/libcxl.txt
index 49edb71..73af3d0 100644
--- a/Documentation/cxl/lib/libcxl.txt
+++ b/Documentation/cxl/lib/libcxl.txt
@@ -179,6 +179,7 @@ struct cxl_bus *cxl_bus_get_first(struct cxl_ctx *ctx);
struct cxl_bus *cxl_bus_get_next(struct cxl_bus *bus);
struct cxl_ctx *cxl_bus_get_ctx(struct cxl_bus *bus);
struct cxl_bus *cxl_memdev_get_bus(struct cxl_memdev *memdev);
+struct cxl_bus *cxl_port_get_bus(struct cxl_port *port);
struct cxl_bus *cxl_endpoint_get_bus(struct cxl_endpoint *endpoint);
#define cxl_bus_foreach(ctx, bus) \
@@ -215,9 +216,9 @@ struct cxl_port *cxl_bus_get_port(struct cxl_bus *bus);
struct cxl_port *cxl_port_get_first(struct cxl_port *parent);
struct cxl_port *cxl_port_get_next(struct cxl_port *port);
struct cxl_port *cxl_port_get_parent(struct cxl_port *port);
-struct cxl_bus *cxl_port_get_bus(struct cxl_port *port);
struct cxl_ctx *cxl_port_get_ctx(struct cxl_port *port);
const char *cxl_port_get_host(struct cxl_port *port);
+struct cxl_port *cxl_decoder_get_port(struct cxl_decoder *decoder);
#define cxl_port_foreach(parent, port) \
for (port = cxl_port_get_first(parent); port != NULL; \
@@ -284,6 +285,73 @@ int cxl_endpoint_get_id(struct cxl_endpoint *endpoint);
int cxl_endpoint_is_enabled(struct cxl_endpoint *endpoint);
----
+DECODERS
+--------
+Decoder objects are associated with the "HDM Decoder Capability"
+published in Port devices and CXL capable PCIe endpoints. The kernel
+additionally models platform firmware described CXL memory ranges (like
+the ACPI CEDT.CFMWS) as static decoder objects. They route System
+Physical Addresses through a port topology to an endpoint decoder that
+does the final translation from SPA to DPA (system-physical-address to
+device-local-physical-address).
+
+=== DECODER: Enumeration
+----
+struct cxl_decoder *cxl_decoder_get_first(struct cxl_port *port);
+struct cxl_decoder *cxl_decoder_get_next(struct cxl_decoder *decoder);
+struct cxl_ctx *cxl_decoder_get_ctx(struct cxl_decoder *decoder);
+
+#define cxl_decoder_foreach(port, decoder) \
+ for (decoder = cxl_decoder_get_first(port); decoder != NULL; \
+ decoder = cxl_decoder_get_next(decoder))
+----
+The definition of a CXL port in libcxl is an object that hosts one or
+more CXL decoder objects.
+
+=== DECODER: Attributes
+----
+unsigned long long cxl_decoder_get_resource(struct cxl_decoder *decoder);
+unsigned long long cxl_decoder_get_size(struct cxl_decoder *decoder);
+const char *cxl_decoder_get_devname(struct cxl_decoder *decoder);
+int cxl_decoder_get_id(struct cxl_decoder *decoder);
+
+enum cxl_decoder_target_type {
+ CXL_DECODER_TTYPE_UNKNOWN,
+ CXL_DECODER_TTYPE_EXPANDER,
+ CXL_DECODER_TTYPE_ACCELERATOR,
+};
+
+cxl_decoder_get_target_type(struct cxl_decoder *decoder);
+bool cxl_decoder_is_pmem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_volatile_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_mem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_accelmem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_locked(struct cxl_decoder *decoder);
+----
+The kernel protects the enumeration of the physical address layout of
+the system. Without CAP_SYS_ADMIN cxl_decoder_get_resource() returns
+ULLONG_MAX to indicate that the address information was not retrievable.
+Otherwise, cxl_decoder_get_resource() returns the currently programmed
+value of the base of the decoder's decode range. A zero-sized decoder
+indicates a disabled decoder.
+
+Root level decoders only support limited set of memory types in their
+address range. The cxl_decoder_is_<memtype>_capable() helpers identify
+what is supported. Switch level decoders, in contrast are capable of
+routing any memory type, i.e. they just forward along the memory type
+support from their parent port. Endpoint decoders follow the
+capabilities of their host memory device.
+
+The capabilities of a decoder are not to be confused with their type /
+mode. The type ultimately depends on the endpoint. For example an
+accelerator requires all decoders in its ancestry to be set to
+CXL_DECODER_TTYPE_ACCELERATOR, and conversely plain memory expander
+devices require CXL_DECODER_TTYPE_EXPANDER.
+
+Platform firmware may setup the CXL decode hierarchy before the OS
+boots, and may additionally require that the OS not change the decode
+settings. This property is indicated by the cxl_decoder_is_locked() API.
+
include::../../copyright.txt[]
SEE ALSO
diff --git a/cxl/filter.c b/cxl/filter.c
index 6dc61a1..dc052f6 100644
--- a/cxl/filter.c
+++ b/cxl/filter.c
@@ -171,6 +171,17 @@ util_cxl_endpoint_filter_by_port(struct cxl_endpoint *endpoint,
return NULL;
}
+static struct cxl_decoder *
+util_cxl_decoder_filter_by_port(struct cxl_decoder *decoder, const char *ident,
+ enum cxl_port_filter_mode mode)
+{
+ struct cxl_port *port = cxl_decoder_get_port(decoder);
+
+ if (util_cxl_port_filter(port, ident, mode))
+ return decoder;
+ return NULL;
+}
+
static struct cxl_bus *util_cxl_bus_filter(struct cxl_bus *bus,
const char *__ident)
{
@@ -233,6 +244,16 @@ static struct cxl_port *util_cxl_port_filter_by_bus(struct cxl_port *port,
return NULL;
}
+static struct cxl_decoder *
+util_cxl_decoder_filter_by_bus(struct cxl_decoder *decoder, const char *__ident)
+{
+ struct cxl_port *port = cxl_decoder_get_port(decoder);
+
+ if (!util_cxl_port_filter_by_bus(port, __ident))
+ return NULL;
+ return decoder;
+}
+
static struct cxl_memdev *
util_cxl_memdev_serial_filter(struct cxl_memdev *memdev, const char *__serials)
{
@@ -357,6 +378,49 @@ static struct cxl_port *util_cxl_port_filter_by_memdev(struct cxl_port *port,
return NULL;
}
+static struct cxl_decoder *util_cxl_decoder_filter(struct cxl_decoder *decoder,
+ const char *__ident)
+{
+ struct cxl_port *port = cxl_decoder_get_port(decoder);
+ int pid, did;
+ char *ident, *save;
+ const char *name;
+
+ if (!__ident)
+ return decoder;
+
+ ident = strdup(__ident);
+ if (!ident)
+ return NULL;
+
+ for (name = strtok_r(ident, which_sep(__ident), &save); name;
+ name = strtok_r(NULL, which_sep(__ident), &save)) {
+ if (strcmp(name, "all") == 0)
+ break;
+
+ if (strcmp(name, "root") == 0 && cxl_port_is_root(port))
+ break;
+ if (strcmp(name, "switch") == 0 && cxl_port_is_switch(port))
+ break;
+ if (strcmp(name, "endpoint") == 0 && cxl_port_is_endpoint(port))
+ break;
+
+ if ((sscanf(name, "%d.%d", &pid, &did) == 2 ||
+ sscanf(name, "decoder%d.%d", &pid, &did) == 2) &&
+ cxl_port_get_id(port) == pid &&
+ cxl_decoder_get_id(decoder) == did)
+ break;
+
+ if (strcmp(name, cxl_decoder_get_devname(decoder)) == 0)
+ break;
+ }
+
+ free(ident);
+ if (name)
+ return decoder;
+ return NULL;
+}
+
static unsigned long params_to_flags(struct cxl_filter_params *param)
{
unsigned long flags = 0;
@@ -440,15 +504,44 @@ static struct json_object *pick_array(struct json_object *child,
return NULL;
}
+static void walk_decoders(struct cxl_port *port, struct cxl_filter_params *p,
+ struct json_object *jdecoders, unsigned long flags)
+{
+ struct cxl_decoder *decoder;
+
+ cxl_decoder_foreach(port, decoder) {
+ struct json_object *jdecoder;
+
+ if (!p->decoders)
+ continue;
+ if (!util_cxl_decoder_filter(decoder, p->decoder_filter))
+ continue;
+ if (!util_cxl_decoder_filter_by_bus(decoder, p->bus_filter))
+ continue;
+ if (!util_cxl_decoder_filter_by_port(decoder, p->port_filter,
+ pf_mode(p)))
+ continue;
+ if (!p->idle && cxl_decoder_get_size(decoder) == 0)
+ continue;
+ jdecoder = util_cxl_decoder_to_json(decoder, flags);
+ if (!decoder) {
+ dbg(p, "decoder object allocation failure\n");
+ continue;
+ }
+ json_object_array_add(jdecoders, jdecoder);
+ }
+}
+
static void walk_endpoints(struct cxl_port *port, struct cxl_filter_params *p,
struct json_object *jeps, struct json_object *jdevs,
- unsigned long flags)
+ struct json_object *jdecoders, unsigned long flags)
{
struct cxl_endpoint *endpoint;
cxl_endpoint_foreach(port, endpoint) {
struct cxl_port *ep_port = cxl_endpoint_get_port(endpoint);
const char *devname = cxl_endpoint_get_devname(endpoint);
+ struct json_object *jchilddecoders = NULL;
struct json_object *jendpoint = NULL;
struct cxl_memdev *memdev;
@@ -495,14 +588,31 @@ static void walk_endpoints(struct cxl_port *port, struct cxl_filter_params *p,
else
json_object_array_add(jdevs, jobj);
}
+
+ if (p->decoders && p->endpoints) {
+ jchilddecoders = json_object_new_array();
+ if (!jchilddecoders) {
+ err(p,
+ "%s: failed to enumerate child decoders\n",
+ devname);
+ continue;
+ }
+ }
+
+ if (!p->decoders)
+ continue;
+ walk_decoders(cxl_endpoint_get_port(endpoint), p,
+ pick_array(jchilddecoders, jdecoders), flags);
+ cond_add_put_array_suffix(jendpoint, "decoders", devname,
+ jchilddecoders);
}
}
-static void walk_child_ports(struct cxl_port *parent_port,
- struct cxl_filter_params *p,
- struct json_object *jports,
- struct json_object *jeps,
- struct json_object *jdevs, unsigned long flags)
+static void
+walk_child_ports(struct cxl_port *parent_port, struct cxl_filter_params *p,
+ struct json_object *jports, struct json_object *jportdecoders,
+ struct json_object *jeps, struct json_object *jepdecoders,
+ struct json_object *jdevs, unsigned long flags)
{
struct cxl_port *port;
@@ -512,6 +622,7 @@ static void walk_child_ports(struct cxl_port *parent_port,
struct json_object *jchilddevs = NULL;
struct json_object *jchildports = NULL;
struct json_object *jchildeps = NULL;
+ struct json_object *jchilddecoders = NULL;
if (!util_cxl_port_filter_by_memdev(port, p->memdev_filter,
p->serial_filter))
@@ -555,19 +666,37 @@ static void walk_child_ports(struct cxl_port *parent_port,
continue;
}
}
+
+ if (p->decoders) {
+ jchilddecoders = json_object_new_array();
+ if (!jchilddecoders) {
+ err(p,
+ "%s: failed to enumerate child decoders\n",
+ devname);
+ continue;
+ }
+ }
}
walk_children:
- if (p->endpoints || p->memdevs)
+ if (p->endpoints || p->memdevs || p->decoders)
walk_endpoints(port, p, pick_array(jchildeps, jeps),
- pick_array(jchilddevs, jdevs), flags);
+ pick_array(jchilddevs, jdevs),
+ pick_array(jchilddecoders, jepdecoders),
+ flags);
+ walk_decoders(port, p,
+ pick_array(jchilddecoders, jportdecoders), flags);
walk_child_ports(port, p, pick_array(jchildports, jports),
+ pick_array(jchilddecoders, jportdecoders),
pick_array(jchildeps, jeps),
+ pick_array(jchilddecoders, jepdecoders),
pick_array(jchilddevs, jdevs), flags);
cond_add_put_array_suffix(jport, "ports", devname, jchildports);
cond_add_put_array_suffix(jport, "endpoints", devname,
jchildeps);
+ cond_add_put_array_suffix(jport, "decoders", devname,
+ jchilddecoders);
cond_add_put_array_suffix(jport, "memdevs", devname,
jchilddevs);
}
@@ -578,6 +707,9 @@ int cxl_filter_walk(struct cxl_ctx *ctx, struct cxl_filter_params *p)
struct json_object *jdevs = NULL, *jbuses = NULL, *jports = NULL;
struct json_object *jplatform = json_object_new_array();
unsigned long flags = params_to_flags(p);
+ struct json_object *jportdecoders = NULL;
+ struct json_object *jbusdecoders = NULL;
+ struct json_object *jepdecoders = NULL;
struct json_object *janondevs = NULL;
struct json_object *jeps = NULL;
struct cxl_memdev *memdev;
@@ -609,6 +741,18 @@ int cxl_filter_walk(struct cxl_ctx *ctx, struct cxl_filter_params *p)
if (!jdevs)
goto err;
+ jbusdecoders = json_object_new_array();
+ if (!jbusdecoders)
+ goto err;
+
+ jportdecoders = json_object_new_array();
+ if (!jportdecoders)
+ goto err;
+
+ jepdecoders = json_object_new_array();
+ if (!jepdecoders)
+ goto err;
+
dbg(p, "walk memdevs\n");
cxl_memdev_foreach(ctx, memdev) {
struct json_object *janondev;
@@ -633,6 +777,7 @@ int cxl_filter_walk(struct cxl_ctx *ctx, struct cxl_filter_params *p)
dbg(p, "walk buses\n");
cxl_bus_foreach(ctx, bus) {
struct json_object *jbus = NULL;
+ struct json_object *jchilddecoders = NULL;
struct json_object *jchildports = NULL;
struct json_object *jchilddevs = NULL;
struct json_object *jchildeps = NULL;
@@ -681,15 +826,33 @@ int cxl_filter_walk(struct cxl_ctx *ctx, struct cxl_filter_params *p)
continue;
}
}
+ if (p->decoders) {
+ jchilddecoders = json_object_new_array();
+ if (!jchilddecoders) {
+ err(p,
+ "%s: failed to enumerate child decoders\n",
+ devname);
+ continue;
+ }
+ }
+
}
walk_children:
+ dbg(p, "walk decoders\n");
+ walk_decoders(port, p, pick_array(jchilddecoders, jbusdecoders),
+ flags);
+
dbg(p, "walk ports\n");
walk_child_ports(port, p, pick_array(jchildports, jports),
+ pick_array(jchilddecoders, jportdecoders),
pick_array(jchildeps, jeps),
+ pick_array(jchilddecoders, jepdecoders),
pick_array(jchilddevs, jdevs), flags);
cond_add_put_array_suffix(jbus, "ports", devname, jchildports);
cond_add_put_array_suffix(jbus, "endpoints", devname,
jchildeps);
+ cond_add_put_array_suffix(jbus, "decoders", devname,
+ jchilddecoders);
cond_add_put_array_suffix(jbus, "memdevs", devname, jchilddevs);
}
@@ -703,12 +866,24 @@ walk_children:
top_level_objs++;
if (json_object_array_length(jdevs))
top_level_objs++;
+ if (json_object_array_length(jbusdecoders))
+ top_level_objs++;
+ if (json_object_array_length(jportdecoders))
+ top_level_objs++;
+ if (json_object_array_length(jepdecoders))
+ top_level_objs++;
splice_array(p, janondevs, jplatform, "anon memdevs", top_level_objs > 1);
splice_array(p, jbuses, jplatform, "buses", top_level_objs > 1);
splice_array(p, jports, jplatform, "ports", top_level_objs > 1);
splice_array(p, jeps, jplatform, "endpoints", top_level_objs > 1);
splice_array(p, jdevs, jplatform, "memdevs", top_level_objs > 1);
+ splice_array(p, jbusdecoders, jplatform, "root decoders",
+ top_level_objs > 1);
+ splice_array(p, jportdecoders, jplatform, "port decoders",
+ top_level_objs > 1);
+ splice_array(p, jepdecoders, jplatform, "endpoint decoders",
+ top_level_objs > 1);
util_display_json_array(stdout, jplatform, flags);
@@ -719,6 +894,9 @@ err:
json_object_put(jports);
json_object_put(jeps);
json_object_put(jdevs);
+ json_object_put(jbusdecoders);
+ json_object_put(jportdecoders);
+ json_object_put(jepdecoders);
json_object_put(jplatform);
return -ENOMEM;
}
diff --git a/cxl/filter.h b/cxl/filter.h
index bbd341c..5d7bf45 100644
--- a/cxl/filter.h
+++ b/cxl/filter.h
@@ -12,8 +12,10 @@ struct cxl_filter_params {
const char *bus_filter;
const char *port_filter;
const char *endpoint_filter;
+ const char *decoder_filter;
bool single;
bool endpoints;
+ bool decoders;
bool memdevs;
bool ports;
bool buses;
diff --git a/cxl/json.c b/cxl/json.c
index 51918d6..548bc52 100644
--- a/cxl/json.c
+++ b/cxl/json.c
@@ -262,6 +262,68 @@ struct json_object *util_cxl_bus_to_json(struct cxl_bus *bus,
return jbus;
}
+struct json_object *util_cxl_decoder_to_json(struct cxl_decoder *decoder,
+ unsigned long flags)
+{
+ const char *devname = cxl_decoder_get_devname(decoder);
+ struct cxl_port *port = cxl_decoder_get_port(decoder);
+ struct json_object *jdecoder, *jobj;
+ u64 val;
+
+ jdecoder = json_object_new_object();
+ if (!jdecoder)
+ return NULL;
+
+ jobj = json_object_new_string(devname);
+ if (jobj)
+ json_object_object_add(jdecoder, "decoder", jobj);
+
+ val = cxl_decoder_get_resource(decoder);
+ if (val < ULLONG_MAX) {
+ jobj = util_json_object_hex(val, flags);
+ if (jobj)
+ json_object_object_add(jdecoder, "resource", jobj);
+ }
+
+ val = cxl_decoder_get_size(decoder);
+ if (val < ULLONG_MAX) {
+ jobj = util_json_object_size(val, flags);
+ if (jobj)
+ json_object_object_add(jdecoder, "size", jobj);
+ }
+
+ if (val == 0) {
+ jobj = json_object_new_string("disabled");
+ if (jobj)
+ json_object_object_add(jdecoder, "state", jobj);
+ }
+
+ if (cxl_port_is_root(port) && cxl_decoder_is_mem_capable(decoder)) {
+ if (cxl_decoder_is_pmem_capable(decoder)) {
+ jobj = json_object_new_boolean(true);
+ if (jobj)
+ json_object_object_add(jdecoder, "pmem_capable",
+ jobj);
+ }
+ if (cxl_decoder_is_volatile_capable(decoder)) {
+ jobj = json_object_new_boolean(true);
+ if (jobj)
+ json_object_object_add(
+ jdecoder, "volatile_capable", jobj);
+ }
+ }
+
+ if (cxl_port_is_root(port) &&
+ cxl_decoder_is_accelmem_capable(decoder)) {
+ jobj = json_object_new_boolean(true);
+ if (jobj)
+ json_object_object_add(jdecoder, "accelmem_capable",
+ jobj);
+ }
+
+ return jdecoder;
+}
+
static struct json_object *__util_cxl_port_to_json(struct cxl_port *port,
const char *name_key,
unsigned long flags)
diff --git a/cxl/json.h b/cxl/json.h
index 8f45190..fcca2e6 100644
--- a/cxl/json.h
+++ b/cxl/json.h
@@ -13,4 +13,6 @@ struct json_object *util_cxl_port_to_json(struct cxl_port *port,
unsigned long flags);
struct json_object *util_cxl_endpoint_to_json(struct cxl_endpoint *endpoint,
unsigned long flags);
+struct json_object *util_cxl_decoder_to_json(struct cxl_decoder *decoder,
+ unsigned long flags);
#endif /* __CXL_UTIL_JSON_H__ */
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 2fdaf71..5e30923 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -63,16 +63,26 @@ static void free_memdev(struct cxl_memdev *memdev, struct list_head *head)
free(memdev->firmware_version);
free(memdev->dev_buf);
free(memdev->dev_path);
- free(memdev->host);
+ free(memdev->host_path);
free(memdev);
}
+static void free_decoder(struct cxl_decoder *decoder, struct list_head *head)
+{
+ if (head)
+ list_del_from(head, &decoder->list);
+ free(decoder->dev_buf);
+ free(decoder->dev_path);
+ free(decoder);
+}
+
static void free_port(struct cxl_port *port, struct list_head *head);
static void free_endpoint(struct cxl_endpoint *endpoint, struct list_head *head);
static void __free_port(struct cxl_port *port, struct list_head *head)
{
struct cxl_port *child, *_c;
struct cxl_endpoint *endpoint, *_e;
+ struct cxl_decoder *decoder, *_d;
if (head)
list_del_from(head, &port->list);
@@ -80,6 +90,8 @@ static void __free_port(struct cxl_port *port, struct list_head *head)
free_port(child, &port->child_ports);
list_for_each_safe(&port->endpoints, endpoint, _e, port.list)
free_endpoint(endpoint, &port->endpoints);
+ list_for_each_safe(&port->decoders, decoder, _d, list)
+ free_decoder(decoder, &port->decoders);
kmod_module_unref(port->module);
free(port->dev_buf);
free(port->dev_path);
@@ -298,9 +310,9 @@ static void *add_cxl_memdev(void *parent, int id, const char *cxlmem_base)
char *path = calloc(1, strlen(cxlmem_base) + 100);
struct cxl_ctx *ctx = parent;
struct cxl_memdev *memdev, *memdev_dup;
- char *host, *rpath = NULL;
char buf[SYSFS_ATTR_SIZE];
struct stat st;
+ char *host;
if (!path)
return NULL;
@@ -358,21 +370,13 @@ static void *add_cxl_memdev(void *parent, int id, const char *cxlmem_base)
if (!memdev->dev_path)
goto err_read;
- rpath = realpath(cxlmem_base, NULL);
- if (!rpath)
+ memdev->host_path = realpath(cxlmem_base, NULL);
+ if (!memdev->host_path)
goto err_read;
- host = strrchr(rpath, '/');
- if (host) {
- host[0] = '\0';
- host = strrchr(rpath, '/');
- }
+ host = strrchr(memdev->host_path, '/');
if (!host)
goto err_read;
- memdev->host = strdup(host + 1);
- if (!memdev->host)
- goto err_read;
- free(rpath);
- rpath = NULL;
+ host[0] = '\0';
sprintf(path, "%s/firmware_version", cxlmem_base);
if (sysfs_read_attr(ctx, path, buf) < 0)
@@ -404,8 +408,8 @@ static void *add_cxl_memdev(void *parent, int id, const char *cxlmem_base)
free(memdev->firmware_version);
free(memdev->dev_buf);
free(memdev->dev_path);
+ free(memdev->host_path);
free(memdev);
- free(rpath);
err_dev:
free(path);
return NULL;
@@ -463,7 +467,7 @@ CXL_EXPORT const char *cxl_memdev_get_devname(struct cxl_memdev *memdev)
CXL_EXPORT const char *cxl_memdev_get_host(struct cxl_memdev *memdev)
{
- return memdev->host;
+ return devpath_to_devname(memdev->host_path);
}
CXL_EXPORT struct cxl_bus *cxl_memdev_get_bus(struct cxl_memdev *memdev)
@@ -679,9 +683,11 @@ static int cxl_port_init(struct cxl_port *port, struct cxl_port *parent_port,
port->ctx = ctx;
port->type = type;
port->parent = parent_port;
+ port->type = type;
list_head_init(&port->child_ports);
list_head_init(&port->endpoints);
+ list_head_init(&port->decoders);
port->dev_path = strdup(cxlport_base);
if (!port->dev_path)
@@ -842,6 +848,207 @@ cxl_endpoint_get_memdev(struct cxl_endpoint *endpoint)
return NULL;
}
+static void *add_cxl_decoder(void *parent, int id, const char *cxldecoder_base)
+{
+ const char *devname = devpath_to_devname(cxldecoder_base);
+ char *path = calloc(1, strlen(cxldecoder_base) + 100);
+ struct cxl_decoder *decoder, *decoder_dup;
+ struct cxl_port *port = parent;
+ struct cxl_ctx *ctx = cxl_port_get_ctx(port);
+ char buf[SYSFS_ATTR_SIZE];
+ size_t i;
+
+ dbg(ctx, "%s: base: \'%s\'\n", devname, cxldecoder_base);
+
+ if (!path)
+ return NULL;
+
+ decoder = calloc(1, sizeof(*decoder));
+ if (!decoder)
+ goto err;
+
+ decoder->id = id;
+ decoder->ctx = ctx;
+ decoder->port = port;
+
+ decoder->dev_path = strdup(cxldecoder_base);
+ if (!decoder->dev_path)
+ goto err;
+
+ decoder->dev_buf = calloc(1, strlen(cxldecoder_base) + 50);
+ if (!decoder->dev_buf)
+ goto err;
+ decoder->buf_len = strlen(cxldecoder_base) + 50;
+
+ sprintf(path, "%s/start", cxldecoder_base);
+ if (sysfs_read_attr(ctx, path, buf) < 0)
+ decoder->start = ULLONG_MAX;
+ else
+ decoder->start = strtoull(buf, NULL, 0);
+
+ sprintf(path, "%s/size", cxldecoder_base);
+ if (sysfs_read_attr(ctx, path, buf) < 0)
+ decoder->size = ULLONG_MAX;
+ else
+ decoder->size = strtoull(buf, NULL, 0);
+
+ switch (port->type) {
+ case CXL_PORT_SWITCH:
+ case CXL_PORT_ENDPOINT:
+ decoder->pmem_capable = true;
+ decoder->volatile_capable = true;
+ decoder->mem_capable = true;
+ decoder->accelmem_capable = true;
+ sprintf(path, "%s/locked", cxldecoder_base);
+ if (sysfs_read_attr(ctx, path, buf) == 0)
+ decoder->locked = !!strtoul(buf, NULL, 0);
+ sprintf(path, "%s/target_type", cxldecoder_base);
+ if (sysfs_read_attr(ctx, path, buf) == 0) {
+ if (strcmp(buf, "accelerator") == 0)
+ decoder->target_type =
+ CXL_DECODER_TTYPE_ACCELERATOR;
+ if (strcmp(buf, "expander") == 0)
+ decoder->target_type =
+ CXL_DECODER_TTYPE_EXPANDER;
+ }
+ break;
+ case CXL_PORT_ROOT: {
+ struct cxl_decoder_flag {
+ char *name;
+ bool *flag;
+ } flags[] = {
+ { "cap_type2", &decoder->accelmem_capable },
+ { "cap_type3", &decoder->mem_capable },
+ { "cap_ram", &decoder->volatile_capable },
+ { "cap_pmem", &decoder->pmem_capable },
+ { "locked", &decoder->locked },
+ };
+
+ for (i = 0; i < ARRAY_SIZE(flags); i++) {
+ struct cxl_decoder_flag *flag = &flags[i];
+
+ sprintf(path, "%s/%s", cxldecoder_base, flag->name);
+ if (sysfs_read_attr(ctx, path, buf) == 0)
+ *(flag->flag) = !!strtoul(buf, NULL, 0);
+ }
+ break;
+ }
+ }
+
+ cxl_decoder_foreach(port, decoder_dup)
+ if (decoder_dup->id == decoder->id) {
+ free_decoder(decoder, NULL);
+ return decoder_dup;
+ }
+
+ list_add(&port->decoders, &decoder->list);
+
+ return decoder;
+err:
+ free(decoder->dev_path);
+ free(decoder->dev_buf);
+ free(decoder);
+ free(path);
+ return NULL;
+}
+
+static void cxl_decoders_init(struct cxl_port *port)
+{
+ struct cxl_ctx *ctx = cxl_port_get_ctx(port);
+ char *decoder_fmt;
+
+ if (port->decoders_init)
+ return;
+
+ if (asprintf(&decoder_fmt, "decoder%d.", cxl_port_get_id(port)) < 0) {
+ err(ctx, "%s: failed to add decoder(s)\n",
+ cxl_port_get_devname(port));
+ return;
+ }
+
+ port->decoders_init = 1;
+
+ sysfs_device_parse(ctx, port->dev_path, decoder_fmt, port,
+ add_cxl_decoder);
+
+ free(decoder_fmt);
+}
+
+CXL_EXPORT struct cxl_decoder *cxl_decoder_get_first(struct cxl_port *port)
+{
+ cxl_decoders_init(port);
+
+ return list_top(&port->decoders, struct cxl_decoder, list);
+}
+
+CXL_EXPORT struct cxl_decoder *cxl_decoder_get_next(struct cxl_decoder *decoder)
+{
+ struct cxl_port *port = decoder->port;
+
+ return list_next(&port->decoders, decoder, list);
+}
+
+CXL_EXPORT struct cxl_ctx *cxl_decoder_get_ctx(struct cxl_decoder *decoder)
+{
+ return decoder->ctx;
+}
+
+CXL_EXPORT int cxl_decoder_get_id(struct cxl_decoder *decoder)
+{
+ return decoder->id;
+}
+
+CXL_EXPORT struct cxl_port *cxl_decoder_get_port(struct cxl_decoder *decoder)
+{
+ return decoder->port;
+}
+
+CXL_EXPORT unsigned long long cxl_decoder_get_resource(struct cxl_decoder *decoder)
+{
+ return decoder->start;
+}
+
+CXL_EXPORT unsigned long long cxl_decoder_get_size(struct cxl_decoder *decoder)
+{
+ return decoder->size;
+}
+
+CXL_EXPORT enum cxl_decoder_target_type
+cxl_decoder_get_target_type(struct cxl_decoder *decoder)
+{
+ return decoder->target_type;
+}
+
+CXL_EXPORT bool cxl_decoder_is_pmem_capable(struct cxl_decoder *decoder)
+{
+ return decoder->pmem_capable;
+}
+
+CXL_EXPORT bool cxl_decoder_is_volatile_capable(struct cxl_decoder *decoder)
+{
+ return decoder->volatile_capable;
+}
+
+CXL_EXPORT bool cxl_decoder_is_mem_capable(struct cxl_decoder *decoder)
+{
+ return decoder->mem_capable;
+}
+
+CXL_EXPORT bool cxl_decoder_is_accelmem_capable(struct cxl_decoder *decoder)
+{
+ return decoder->accelmem_capable;
+}
+
+CXL_EXPORT bool cxl_decoder_is_locked(struct cxl_decoder *decoder)
+{
+ return decoder->locked;
+}
+
+CXL_EXPORT const char *cxl_decoder_get_devname(struct cxl_decoder *decoder)
+{
+ return devpath_to_devname(decoder->dev_path);
+}
+
static void *add_cxl_port(void *parent, int id, const char *cxlport_base)
{
const char *devname = devpath_to_devname(cxlport_base);
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index f235e99..22babb7 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -117,4 +117,18 @@ global:
cxl_memdev_get_bus;
cxl_memdev_disable_invalidate;
cxl_memdev_enable;
+ cxl_decoder_get_first;
+ cxl_decoder_get_next;
+ cxl_decoder_get_ctx;
+ cxl_decoder_get_id;
+ cxl_decoder_get_port;
+ cxl_decoder_get_resource;
+ cxl_decoder_get_size;
+ cxl_decoder_get_devname;
+ cxl_decoder_get_target_type;
+ cxl_decoder_is_pmem_capable;
+ cxl_decoder_is_volatile_capable;
+ cxl_decoder_is_mem_capable;
+ cxl_decoder_is_accelmem_capable;
+ cxl_decoder_is_locked;
} LIBCXL_1;
diff --git a/cxl/lib/private.h b/cxl/lib/private.h
index c00bb36..1743a24 100644
--- a/cxl/lib/private.h
+++ b/cxl/lib/private.h
@@ -23,7 +23,7 @@ struct cxl_memdev {
int numa_node;
void *dev_buf;
size_t buf_len;
- char *host;
+ char *host_path;
char *dev_path;
char *firmware_version;
struct cxl_ctx *ctx;
@@ -52,6 +52,7 @@ struct cxl_port {
char *uport;
int ports_init;
int endpoints_init;
+ int decoders_init;
struct cxl_ctx *ctx;
struct cxl_bus *bus;
enum cxl_port_type type;
@@ -60,6 +61,7 @@ struct cxl_port {
struct list_node list;
struct list_head child_ports;
struct list_head endpoints;
+ struct list_head decoders;
};
struct cxl_bus {
@@ -71,6 +73,33 @@ struct cxl_endpoint {
struct cxl_memdev *memdev;
};
+struct cxl_target {
+ struct list_node list;
+ struct cxl_decoder *decoder;
+ char *dev_path;
+ int id, position;
+};
+
+struct cxl_decoder {
+ struct cxl_port *port;
+ struct list_node list;
+ struct cxl_ctx *ctx;
+ u64 start;
+ u64 size;
+ void *dev_buf;
+ size_t buf_len;
+ char *dev_path;
+ int nr_targets;
+ int id;
+ bool pmem_capable;
+ bool volatile_capable;
+ bool mem_capable;
+ bool accelmem_capable;
+ bool locked;
+ enum cxl_decoder_target_type target_type;
+ struct list_head targets;
+};
+
enum cxl_cmd_query_status {
CXL_CMD_QUERY_NOT_RUN = 0,
CXL_CMD_QUERY_OK,
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index 53f68dd..439ed93 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -98,6 +98,34 @@ bool cxl_port_hosts_memdev(struct cxl_port *port, struct cxl_memdev *memdev);
for (port = cxl_port_get_first(parent); port != NULL; \
port = cxl_port_get_next(port))
+struct cxl_decoder;
+struct cxl_decoder *cxl_decoder_get_first(struct cxl_port *port);
+struct cxl_decoder *cxl_decoder_get_next(struct cxl_decoder *decoder);
+unsigned long long cxl_decoder_get_resource(struct cxl_decoder *decoder);
+unsigned long long cxl_decoder_get_size(struct cxl_decoder *decoder);
+const char *cxl_decoder_get_devname(struct cxl_decoder *decoder);
+struct cxl_ctx *cxl_decoder_get_ctx(struct cxl_decoder *decoder);
+int cxl_decoder_get_id(struct cxl_decoder *decoder);
+struct cxl_port *cxl_decoder_get_port(struct cxl_decoder *decoder);
+
+enum cxl_decoder_target_type {
+ CXL_DECODER_TTYPE_UNKNOWN,
+ CXL_DECODER_TTYPE_EXPANDER,
+ CXL_DECODER_TTYPE_ACCELERATOR,
+};
+
+enum cxl_decoder_target_type
+cxl_decoder_get_target_type(struct cxl_decoder *decoder);
+bool cxl_decoder_is_pmem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_volatile_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_mem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_accelmem_capable(struct cxl_decoder *decoder);
+bool cxl_decoder_is_locked(struct cxl_decoder *decoder);
+
+#define cxl_decoder_foreach(port, decoder) \
+ for (decoder = cxl_decoder_get_first(port); decoder != NULL; \
+ decoder = cxl_decoder_get_next(decoder))
+
struct cxl_endpoint;
struct cxl_endpoint *cxl_endpoint_get_first(struct cxl_port *parent);
struct cxl_endpoint *cxl_endpoint_get_next(struct cxl_endpoint *endpoint);
diff --git a/cxl/list.c b/cxl/list.c
index b15e01c..d70192a 100644
--- a/cxl/list.c
+++ b/cxl/list.c
@@ -36,6 +36,11 @@ static const struct option options[] = {
"filter by CXL endpoint device name(s)"),
OPT_BOOLEAN('E', "endpoints", &param.endpoints,
"include CXL endpoint info"),
+ OPT_STRING('d', "decoder", &param.decoder_filter,
+ "decoder device name",
+ "filter by CXL decoder device name(s) / class"),
+ OPT_BOOLEAN('D', "decoders", &param.decoders,
+ "include CXL decoder info"),
OPT_BOOLEAN('i', "idle", &param.idle, "include disabled devices"),
OPT_BOOLEAN('u', "human", &param.human,
"use human friendly number formats "),
@@ -50,7 +55,7 @@ static const struct option options[] = {
static int num_list_flags(void)
{
return !!param.memdevs + !!param.buses + !!param.ports +
- !!param.endpoints;
+ !!param.endpoints + !!param.decoders;
}
int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
@@ -82,6 +87,8 @@ int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
param.ports = true;
if (param.endpoint_filter)
param.endpoints = true;
+ if (param.decoder_filter)
+ param.decoders = true;
if (num_list_flags() == 0) {
/*
* TODO: We likely want to list regions by default if
diff --git a/util/json.h b/util/json.h
index 061f0d4..e026df1 100644
--- a/util/json.h
+++ b/util/json.h
@@ -18,6 +18,7 @@ enum util_json_flags {
UTIL_JSON_FIRMWARE = (1 << 8),
UTIL_JSON_DAX_MAPPINGS = (1 << 9),
UTIL_JSON_HEALTH = (1 << 10),
+ UTIL_JSON_TARGETS = (1 << 11),
};
void util_display_json_array(FILE *f_out, struct json_object *jarray,
--
2.27.0
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