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Subject[RFC v2 3/5] hmem: add heterogeneous memory sysfs support
Date
Add a new sysfs subsystem, /sys/devices/system/hmem, which surfaces
information about memory initiators and memory targets to the user. These
initiators and targets are described by the ACPI SRAT and HMAT tables.

A "memory initiator" in this case is any device such as a CPU or a separate
memory I/O device that can initiate a memory request. A "memory target" is
a CPU-accessible physical address range.

The key piece of information surfaced by this patch is the mapping between
the ACPI table "proximity domain" numbers, held in the "firmware_id"
attribute, and Linux NUMA node numbers.

Initiators are found at /sys/devices/system/hmem/mem_initX, and the
attributes for a given initiator look like this:

# tree mem_init0/
mem_init0/
├── cpu0 -> ../../cpu/cpu0
├── firmware_id
├── is_enabled
├── node0 -> ../../node/node0
├── power
│   ├── async
│   ...
├── subsystem -> ../../../../bus/hmem
└── uevent

Where "mem_init0" on my system represents the CPU acting as a memory
initiator at NUMA node 0.

Targets are found at /sys/devices/system/hmem/mem_tgtX, and the attributes
for a given target look like this:

# tree mem_tgt2/
mem_tgt2/
├── firmware_id
├── is_cached
├── is_enabled
├── is_isolated
├── node2 -> ../../node/node2
├── phys_addr_base
├── phys_length_bytes
├── power
│   ├── async
│   ...
├── subsystem -> ../../../../bus/hmem
└── uevent

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---
MAINTAINERS | 5 +
drivers/acpi/Kconfig | 1 +
drivers/acpi/Makefile | 1 +
drivers/acpi/hmem/Kconfig | 7 +
drivers/acpi/hmem/Makefile | 2 +
drivers/acpi/hmem/core.c | 569 ++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/hmem/hmem.h | 47 ++++
drivers/acpi/hmem/initiator.c | 61 +++++
drivers/acpi/hmem/target.c | 97 +++++++
9 files changed, 790 insertions(+)
create mode 100644 drivers/acpi/hmem/Kconfig
create mode 100644 drivers/acpi/hmem/Makefile
create mode 100644 drivers/acpi/hmem/core.c
create mode 100644 drivers/acpi/hmem/hmem.h
create mode 100644 drivers/acpi/hmem/initiator.c
create mode 100644 drivers/acpi/hmem/target.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 053c3bd..554b833 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6085,6 +6085,11 @@ S: Supported
F: drivers/scsi/hisi_sas/
F: Documentation/devicetree/bindings/scsi/hisilicon-sas.txt

+HMEM (ACPI HETEROGENEOUS MEMORY SUPPORT)
+M: Ross Zwisler <ross.zwisler@linux.intel.com>
+S: Supported
+F: drivers/acpi/hmem/
+
HOST AP DRIVER
M: Jouni Malinen <j@w1.fi>
L: linux-wireless@vger.kernel.org
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1ce52f8..44dd97f 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -460,6 +460,7 @@ config ACPI_REDUCED_HARDWARE_ONLY
If you are unsure what to do, do not enable this option.

source "drivers/acpi/nfit/Kconfig"
+source "drivers/acpi/hmem/Kconfig"

source "drivers/acpi/apei/Kconfig"
source "drivers/acpi/dptf/Kconfig"
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b1aacfc..31e3f20 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_ACPI_PROCESSOR) += processor.o
obj-$(CONFIG_ACPI) += container.o
obj-$(CONFIG_ACPI_THERMAL) += thermal.o
obj-$(CONFIG_ACPI_NFIT) += nfit/
+obj-$(CONFIG_ACPI_HMEM) += hmem/
obj-$(CONFIG_ACPI) += acpi_memhotplug.o
obj-$(CONFIG_ACPI_HOTPLUG_IOAPIC) += ioapic.o
obj-$(CONFIG_ACPI_BATTERY) += battery.o
diff --git a/drivers/acpi/hmem/Kconfig b/drivers/acpi/hmem/Kconfig
new file mode 100644
index 0000000..09282be
--- /dev/null
+++ b/drivers/acpi/hmem/Kconfig
@@ -0,0 +1,7 @@
+config ACPI_HMEM
+ bool "ACPI Heterogeneous Memory Support"
+ depends on ACPI_NUMA
+ depends on SYSFS
+ help
+ Exports a sysfs representation of the ACPI Heterogeneous Memory
+ Attributes Table (HMAT).
diff --git a/drivers/acpi/hmem/Makefile b/drivers/acpi/hmem/Makefile
new file mode 100644
index 0000000..d2aa546
--- /dev/null
+++ b/drivers/acpi/hmem/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_ACPI_HMEM) := hmem.o
+hmem-y := core.o initiator.o target.o
diff --git a/drivers/acpi/hmem/core.c b/drivers/acpi/hmem/core.c
new file mode 100644
index 0000000..f7638db
--- /dev/null
+++ b/drivers/acpi/hmem/core.c
@@ -0,0 +1,569 @@
+/*
+ * Heterogeneous memory representation in sysfs
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <acpi/acpi_numa.h>
+#include <linux/acpi.h>
+#include <linux/cpu.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "hmem.h"
+
+static LIST_HEAD(target_list);
+static LIST_HEAD(initiator_list);
+
+static bool bad_hmem;
+
+static int link_node_for_kobj(unsigned int node, struct kobject *kobj)
+{
+ if (node_devices[node])
+ return sysfs_create_link(kobj, &node_devices[node]->dev.kobj,
+ kobject_name(&node_devices[node]->dev.kobj));
+
+ return 0;
+}
+
+static void remove_node_for_kobj(unsigned int node, struct kobject *kobj)
+{
+ if (node_devices[node])
+ sysfs_remove_link(kobj,
+ kobject_name(&node_devices[node]->dev.kobj));
+}
+
+#define HMEM_CLASS_NAME "hmem"
+
+static struct bus_type hmem_subsys = {
+ /*
+ * .dev_name is set before device_register() based on the type of
+ * device we are registering.
+ */
+ .name = HMEM_CLASS_NAME,
+};
+
+/* memory initiators */
+static int link_cpu_under_mem_init(struct memory_initiator *init)
+{
+ struct device *cpu_dev;
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev)
+ continue;
+
+ if (pxm_to_node(init->pxm) == cpu_to_node(cpu)) {
+ return sysfs_create_link(&init->dev.kobj,
+ &cpu_dev->kobj,
+ kobject_name(&cpu_dev->kobj));
+ }
+
+ }
+ return 0;
+}
+
+static void remove_cpu_under_mem_init(struct memory_initiator *init)
+{
+ struct device *cpu_dev;
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev)
+ continue;
+
+ if (pxm_to_node(init->pxm) == cpu_to_node(cpu)) {
+ sysfs_remove_link(&init->dev.kobj,
+ kobject_name(&cpu_dev->kobj));
+ return;
+ }
+
+ }
+}
+
+static void release_memory_initiator(struct device *dev)
+{
+ struct memory_initiator *init = to_memory_initiator(dev);
+
+ list_del(&init->list);
+ kfree(init);
+}
+
+static void __init remove_memory_initiator(struct memory_initiator *init)
+{
+ if (init->is_registered) {
+ remove_cpu_under_mem_init(init);
+ remove_node_for_kobj(pxm_to_node(init->pxm), &init->dev.kobj);
+ device_unregister(&init->dev);
+ } else
+ release_memory_initiator(&init->dev);
+}
+
+static int __init register_memory_initiator(struct memory_initiator *init)
+{
+ int ret;
+
+ hmem_subsys.dev_name = "mem_init";
+ init->dev.bus = &hmem_subsys;
+ init->dev.id = pxm_to_node(init->pxm);
+ init->dev.release = release_memory_initiator;
+ init->dev.groups = memory_initiator_attribute_groups;
+
+ ret = device_register(&init->dev);
+ if (ret < 0)
+ return ret;
+
+ init->is_registered = true;
+
+ ret = link_cpu_under_mem_init(init);
+ if (ret < 0)
+ return ret;
+
+ return link_node_for_kobj(pxm_to_node(init->pxm), &init->dev.kobj);
+}
+
+static struct memory_initiator * __init add_memory_initiator(int pxm)
+{
+ struct memory_initiator *init;
+
+ if (pxm_to_node(pxm) == NUMA_NO_NODE) {
+ pr_err("HMEM: No NUMA node for PXM %d\n", pxm);
+ bad_hmem = true;
+ return ERR_PTR(-EINVAL);
+ }
+
+ /*
+ * Make sure we haven't already added an initiator for this proximity
+ * domain. We don't care about any other differences in the SRAT
+ * tables (apic_id, etc), so we just use the data from the first table
+ * we see for a given proximity domain.
+ */
+ list_for_each_entry(init, &initiator_list, list)
+ if (init->pxm == pxm)
+ return 0;
+
+ init = kzalloc(sizeof(*init), GFP_KERNEL);
+ if (!init) {
+ bad_hmem = true;
+ return ERR_PTR(-ENOMEM);
+ }
+
+ init->pxm = pxm;
+
+ list_add_tail(&init->list, &initiator_list);
+ return init;
+}
+
+/* memory targets */
+static void release_memory_target(struct device *dev)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ list_del(&tgt->list);
+ kfree(tgt);
+}
+
+static void __init remove_memory_target(struct memory_target *tgt)
+{
+ if (tgt->is_registered) {
+ remove_node_for_kobj(pxm_to_node(tgt->ma->proximity_domain),
+ &tgt->dev.kobj);
+ device_unregister(&tgt->dev);
+ } else
+ release_memory_target(&tgt->dev);
+}
+
+static int __init register_memory_target(struct memory_target *tgt)
+{
+ int ret;
+
+ if (!tgt->ma || !tgt->spa) {
+ pr_err("HMEM: Incomplete memory target found\n");
+ return -EINVAL;
+ }
+
+ hmem_subsys.dev_name = "mem_tgt";
+ tgt->dev.bus = &hmem_subsys;
+ tgt->dev.id = pxm_to_node(tgt->ma->proximity_domain);
+ tgt->dev.release = release_memory_target;
+ tgt->dev.groups = memory_target_attribute_groups;
+
+ ret = device_register(&tgt->dev);
+ if (ret < 0)
+ return ret;
+
+ tgt->is_registered = true;
+
+ return link_node_for_kobj(pxm_to_node(tgt->ma->proximity_domain),
+ &tgt->dev.kobj);
+}
+
+static int __init add_memory_target(struct acpi_srat_mem_affinity *ma)
+{
+ struct memory_target *tgt;
+
+ if (pxm_to_node(ma->proximity_domain) == NUMA_NO_NODE) {
+ pr_err("HMEM: No NUMA node for PXM %d\n", ma->proximity_domain);
+ bad_hmem = true;
+ return -EINVAL;
+ }
+
+ tgt = kzalloc(sizeof(*tgt), GFP_KERNEL);
+ if (!tgt) {
+ bad_hmem = true;
+ return -ENOMEM;
+ }
+
+ tgt->ma = ma;
+
+ list_add_tail(&tgt->list, &target_list);
+ return 0;
+}
+
+/* ACPI parsing code, starting with the HMAT */
+static int __init hmem_noop_parse(struct acpi_table_header *table)
+{
+ /* real work done by the hmat_parse_* and srat_parse_* routines */
+ return 0;
+}
+
+static bool __init hmat_spa_matches_srat(struct acpi_hmat_address_range *spa,
+ struct acpi_srat_mem_affinity *ma)
+{
+ if (spa->physical_address_base != ma->base_address ||
+ spa->physical_address_length != ma->length)
+ return false;
+
+ return true;
+}
+
+static void find_local_initiator(struct memory_target *tgt)
+{
+ struct memory_initiator *init;
+
+ if (!(tgt->spa->flags & ACPI_HMAT_PROCESSOR_PD_VALID) ||
+ pxm_to_node(tgt->spa->processor_PD) == NUMA_NO_NODE)
+ return;
+
+ list_for_each_entry(init, &initiator_list, list) {
+ if (init->pxm == tgt->spa->processor_PD) {
+ tgt->local_init = init;
+ return;
+ }
+ }
+}
+
+/* ACPI HMAT parsing routines */
+static int __init
+hmat_parse_address_range(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_hmat_address_range *spa;
+ struct memory_target *tgt;
+
+ if (bad_hmem)
+ return 0;
+
+ spa = (struct acpi_hmat_address_range *)header;
+ if (!spa) {
+ pr_err("HMEM: NULL table entry\n");
+ goto err;
+ }
+
+ if (spa->header.length != sizeof(*spa)) {
+ pr_err("HMEM: Unexpected header length: %d\n",
+ spa->header.length);
+ goto err;
+ }
+
+ list_for_each_entry(tgt, &target_list, list) {
+ if ((spa->flags & ACPI_HMAT_MEMORY_PD_VALID) &&
+ spa->memory_PD == tgt->ma->proximity_domain) {
+ if (!hmat_spa_matches_srat(spa, tgt->ma)) {
+ pr_err("HMEM: SRAT and HMAT disagree on "
+ "address range info\n");
+ goto err;
+ }
+ tgt->spa = spa;
+ find_local_initiator(tgt);
+ return 0;
+ }
+ }
+
+ return 0;
+err:
+ bad_hmem = true;
+ return -EINVAL;
+}
+
+static int __init hmat_parse_cache(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_hmat_cache *cache;
+ struct memory_target *tgt;
+
+ if (bad_hmem)
+ return 0;
+
+ cache = (struct acpi_hmat_cache *)header;
+ if (!cache) {
+ pr_err("HMEM: NULL table entry\n");
+ goto err;
+ }
+
+ if (cache->header.length < sizeof(*cache)) {
+ pr_err("HMEM: Unexpected header length: %d\n",
+ cache->header.length);
+ goto err;
+ }
+
+ list_for_each_entry(tgt, &target_list, list) {
+ if (cache->memory_PD == tgt->ma->proximity_domain) {
+ tgt->is_cached = true;
+ return 0;
+ }
+ }
+
+ pr_err("HMEM: Couldn't find cached target PXM %d\n", cache->memory_PD);
+err:
+ bad_hmem = true;
+ return -EINVAL;
+}
+
+/*
+ * SRAT parsing. We use srat_disabled() and pxm_to_node() so we don't redo
+ * any of the SRAT sanity checking done in drivers/acpi/numa.c.
+ */
+static int __init
+srat_parse_processor_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_cpu_affinity *cpu;
+ struct memory_initiator *init;
+ u32 pxm;
+
+ if (bad_hmem)
+ return 0;
+
+ cpu = (struct acpi_srat_cpu_affinity *)header;
+ if (!cpu) {
+ pr_err("HMEM: NULL table entry\n");
+ bad_hmem = true;
+ return -EINVAL;
+ }
+
+ pxm = cpu->proximity_domain_lo;
+ if (acpi_srat_revision >= 2)
+ pxm |= *((unsigned int *)cpu->proximity_domain_hi) << 8;
+
+ if (!(cpu->flags & ACPI_SRAT_CPU_ENABLED))
+ return 0;
+
+ init = add_memory_initiator(pxm);
+ if (IS_ERR_OR_NULL(init))
+ return PTR_ERR(init);
+
+ init->cpu = cpu;
+ return 0;
+}
+
+static int __init
+srat_parse_x2apic_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_x2apic_cpu_affinity *x2apic;
+ struct memory_initiator *init;
+
+ if (bad_hmem)
+ return 0;
+
+ x2apic = (struct acpi_srat_x2apic_cpu_affinity *)header;
+ if (!x2apic) {
+ pr_err("HMEM: NULL table entry\n");
+ bad_hmem = true;
+ return -EINVAL;
+ }
+
+ if (!(x2apic->flags & ACPI_SRAT_CPU_ENABLED))
+ return 0;
+
+ init = add_memory_initiator(x2apic->proximity_domain);
+ if (IS_ERR_OR_NULL(init))
+ return PTR_ERR(init);
+
+ init->x2apic = x2apic;
+ return 0;
+}
+
+static int __init
+srat_parse_gicc_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_gicc_affinity *gicc;
+ struct memory_initiator *init;
+
+ if (bad_hmem)
+ return 0;
+
+ gicc = (struct acpi_srat_gicc_affinity *)header;
+ if (!gicc) {
+ pr_err("HMEM: NULL table entry\n");
+ bad_hmem = true;
+ return -EINVAL;
+ }
+
+ if (!(gicc->flags & ACPI_SRAT_GICC_ENABLED))
+ return 0;
+
+ init = add_memory_initiator(gicc->proximity_domain);
+ if (IS_ERR_OR_NULL(init))
+ return PTR_ERR(init);
+
+ init->gicc = gicc;
+ return 0;
+}
+
+static int __init
+srat_parse_memory_affinity(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_srat_mem_affinity *ma;
+
+ if (bad_hmem)
+ return 0;
+
+ ma = (struct acpi_srat_mem_affinity *)header;
+ if (!ma) {
+ pr_err("HMEM: NULL table entry\n");
+ bad_hmem = true;
+ return -EINVAL;
+ }
+
+ if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
+ return 0;
+
+ return add_memory_target(ma);
+}
+
+/*
+ * Remove our sysfs entries, unregister our devices and free allocated memory.
+ */
+static void hmem_cleanup(void)
+{
+ struct memory_initiator *init, *init_iter;
+ struct memory_target *tgt, *tgt_iter;
+
+ list_for_each_entry_safe(tgt, tgt_iter, &target_list, list)
+ remove_memory_target(tgt);
+
+ list_for_each_entry_safe(init, init_iter, &initiator_list, list)
+ remove_memory_initiator(init);
+}
+
+static int __init hmem_init(void)
+{
+ struct acpi_table_header *tbl;
+ struct memory_initiator *init;
+ struct memory_target *tgt;
+ acpi_status status = AE_OK;
+ int ret;
+
+ if (srat_disabled())
+ return 0;
+
+ /*
+ * We take a permanent reference to both the HMAT and SRAT in ACPI
+ * memory so we can keep pointers to their subtables. These tables
+ * already had references on them which would never be released, taken
+ * by acpi_sysfs_init(), so this shouldn't negatively impact anything.
+ */
+ status = acpi_get_table(ACPI_SIG_SRAT, 0, &tbl);
+ if (ACPI_FAILURE(status))
+ return 0;
+
+ status = acpi_get_table(ACPI_SIG_HMAT, 0, &tbl);
+ if (ACPI_FAILURE(status))
+ return 0;
+
+ ret = subsys_system_register(&hmem_subsys, NULL);
+ if (ret)
+ return ret;
+
+ if (!acpi_table_parse(ACPI_SIG_SRAT, hmem_noop_parse)) {
+ struct acpi_subtable_proc srat_proc[4];
+
+ memset(srat_proc, 0, sizeof(srat_proc));
+ srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
+ srat_proc[0].handler = srat_parse_processor_affinity;
+ srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
+ srat_proc[1].handler = srat_parse_x2apic_affinity;
+ srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
+ srat_proc[2].handler = srat_parse_gicc_affinity;
+ srat_proc[3].id = ACPI_SRAT_TYPE_MEMORY_AFFINITY;
+ srat_proc[3].handler = srat_parse_memory_affinity;
+
+ acpi_table_parse_entries_array(ACPI_SIG_SRAT,
+ sizeof(struct acpi_table_srat),
+ srat_proc, ARRAY_SIZE(srat_proc), 0);
+ }
+
+ if (!acpi_table_parse(ACPI_SIG_HMAT, hmem_noop_parse)) {
+ struct acpi_subtable_proc hmat_proc[2];
+
+ memset(hmat_proc, 0, sizeof(hmat_proc));
+ hmat_proc[0].id = ACPI_HMAT_TYPE_ADDRESS_RANGE;
+ hmat_proc[0].handler = hmat_parse_address_range;
+ hmat_proc[1].id = ACPI_HMAT_TYPE_CACHE;
+ hmat_proc[1].handler = hmat_parse_cache;
+
+ acpi_table_parse_entries_array(ACPI_SIG_HMAT,
+ sizeof(struct acpi_table_hmat),
+ hmat_proc, ARRAY_SIZE(hmat_proc), 0);
+ }
+
+ if (bad_hmem) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ list_for_each_entry(init, &initiator_list, list) {
+ ret = register_memory_initiator(init);
+ if (ret)
+ goto err;
+ }
+
+ list_for_each_entry(tgt, &target_list, list) {
+ ret = register_memory_target(tgt);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+err:
+ pr_err("HMEM: Error during initialization\n");
+ hmem_cleanup();
+ return ret;
+}
+
+static __exit void hmem_exit(void)
+{
+ hmem_cleanup();
+}
+
+module_init(hmem_init);
+module_exit(hmem_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Intel Corporation");
diff --git a/drivers/acpi/hmem/hmem.h b/drivers/acpi/hmem/hmem.h
new file mode 100644
index 0000000..38ff540
--- /dev/null
+++ b/drivers/acpi/hmem/hmem.h
@@ -0,0 +1,47 @@
+/*
+ * Heterogeneous memory representation in sysfs
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _ACPI_HMEM_H_
+#define _ACPI_HMEM_H_
+
+struct memory_initiator {
+ struct list_head list;
+ struct device dev;
+
+ /* only one of the following three will be set */
+ struct acpi_srat_cpu_affinity *cpu;
+ struct acpi_srat_x2apic_cpu_affinity *x2apic;
+ struct acpi_srat_gicc_affinity *gicc;
+
+ int pxm;
+ bool is_registered;
+};
+#define to_memory_initiator(d) container_of((d), struct memory_initiator, dev)
+
+struct memory_target {
+ struct list_head list;
+ struct device dev;
+ struct acpi_srat_mem_affinity *ma;
+ struct acpi_hmat_address_range *spa;
+ struct memory_initiator *local_init;
+
+ bool is_cached;
+ bool is_registered;
+};
+#define to_memory_target(d) container_of((d), struct memory_target, dev)
+
+extern const struct attribute_group *memory_initiator_attribute_groups[];
+extern const struct attribute_group *memory_target_attribute_groups[];
+#endif /* _ACPI_HMEM_H_ */
diff --git a/drivers/acpi/hmem/initiator.c b/drivers/acpi/hmem/initiator.c
new file mode 100644
index 0000000..905f030
--- /dev/null
+++ b/drivers/acpi/hmem/initiator.c
@@ -0,0 +1,61 @@
+/*
+ * Heterogeneous memory initiator sysfs attributes
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <acpi/acpi_numa.h>
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include "hmem.h"
+
+static ssize_t firmware_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_initiator *init = to_memory_initiator(dev);
+
+ return sprintf(buf, "%d\n", init->pxm);
+}
+static DEVICE_ATTR_RO(firmware_id);
+
+static ssize_t is_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_initiator *init = to_memory_initiator(dev);
+ int is_enabled;
+
+ if (init->cpu)
+ is_enabled = !!(init->cpu->flags & ACPI_SRAT_CPU_ENABLED);
+ else if (init->x2apic)
+ is_enabled = !!(init->x2apic->flags & ACPI_SRAT_CPU_ENABLED);
+ else
+ is_enabled = !!(init->gicc->flags & ACPI_SRAT_GICC_ENABLED);
+
+ return sprintf(buf, "%d\n", is_enabled);
+}
+static DEVICE_ATTR_RO(is_enabled);
+
+static struct attribute *memory_initiator_attributes[] = {
+ &dev_attr_firmware_id.attr,
+ &dev_attr_is_enabled.attr,
+ NULL,
+};
+
+static struct attribute_group memory_initiator_attribute_group = {
+ .attrs = memory_initiator_attributes,
+};
+
+const struct attribute_group *memory_initiator_attribute_groups[] = {
+ &memory_initiator_attribute_group,
+ NULL,
+};
diff --git a/drivers/acpi/hmem/target.c b/drivers/acpi/hmem/target.c
new file mode 100644
index 0000000..dd57437
--- /dev/null
+++ b/drivers/acpi/hmem/target.c
@@ -0,0 +1,97 @@
+/*
+ * Heterogeneous memory target sysfs attributes
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <acpi/acpi_numa.h>
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include "hmem.h"
+
+/* attributes for memory targets */
+static ssize_t phys_addr_base_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%#llx\n", tgt->ma->base_address);
+}
+static DEVICE_ATTR_RO(phys_addr_base);
+
+static ssize_t phys_length_bytes_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%#llx\n", tgt->ma->length);
+}
+static DEVICE_ATTR_RO(phys_length_bytes);
+
+static ssize_t firmware_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%d\n", tgt->ma->proximity_domain);
+}
+static DEVICE_ATTR_RO(firmware_id);
+
+static ssize_t is_cached_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%d\n", tgt->is_cached);
+}
+static DEVICE_ATTR_RO(is_cached);
+
+static ssize_t is_isolated_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%d\n",
+ !!(tgt->spa->flags & ACPI_HMAT_RESERVATION_HINT));
+}
+static DEVICE_ATTR_RO(is_isolated);
+
+static ssize_t is_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct memory_target *tgt = to_memory_target(dev);
+
+ return sprintf(buf, "%d\n",
+ !!(tgt->ma->flags & ACPI_SRAT_MEM_ENABLED));
+}
+static DEVICE_ATTR_RO(is_enabled);
+
+static struct attribute *memory_target_attributes[] = {
+ &dev_attr_phys_addr_base.attr,
+ &dev_attr_phys_length_bytes.attr,
+ &dev_attr_firmware_id.attr,
+ &dev_attr_is_cached.attr,
+ &dev_attr_is_isolated.attr,
+ &dev_attr_is_enabled.attr,
+ NULL
+};
+
+/* attributes which are present for all memory targets */
+static struct attribute_group memory_target_attribute_group = {
+ .attrs = memory_target_attributes,
+};
+
+const struct attribute_group *memory_target_attribute_groups[] = {
+ &memory_target_attribute_group,
+ NULL,
+};
--
2.9.4
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