From: Keith Busch keith.busch@intel.com
mainline inclusion from mainline-v5.2-rc1 commit 3accf7ae37a96c3bf4b51999f3c395ac5ffcd6d4 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA
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commit 3accf7ae37a96c3bf4b51999f3c395ac5ffcd6d4 upstream.
Systems may provide different memory types and export this information in the ACPI Heterogeneous Memory Attribute Table (HMAT). Parse these tables provided by the platform and report the memory access and caching attributes to the kernel messages.
Reviewed-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Acked-by: Jonathan Cameron Jonathan.Cameron@huawei.com Tested-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Keith Busch keith.busch@intel.com Tested-by: Brice Goglin Brice.Goglin@inria.fr Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Fan Du fan.du@intel.com Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Hanjun Guo guohanjun@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/acpi/Kconfig | 1 + drivers/acpi/Makefile | 1 + drivers/acpi/hmat/Kconfig | 7 ++ drivers/acpi/hmat/Makefile | 1 + drivers/acpi/hmat/hmat.c | 236 +++++++++++++++++++++++++++++++++++++ 5 files changed, 246 insertions(+) create mode 100644 drivers/acpi/hmat/Kconfig create mode 100644 drivers/acpi/hmat/Makefile create mode 100644 drivers/acpi/hmat/hmat.c
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index e955a30f1a52..89d5fd8020ec 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -470,6 +470,7 @@ 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/hmat/Kconfig"
source "drivers/acpi/apei/Kconfig" source "drivers/acpi/dptf/Kconfig" diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index edc039313cd6..696ea10f7788 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_ACPI_PROCESSOR) += processor.o obj-$(CONFIG_ACPI) += container.o obj-$(CONFIG_ACPI_THERMAL) += thermal.o obj-$(CONFIG_ACPI_NFIT) += nfit/ +obj-$(CONFIG_ACPI_HMAT) += hmat/ obj-$(CONFIG_ACPI) += acpi_memhotplug.o obj-$(CONFIG_ACPI_HOTPLUG_IOAPIC) += ioapic.o obj-$(CONFIG_ACPI_BATTERY) += battery.o diff --git a/drivers/acpi/hmat/Kconfig b/drivers/acpi/hmat/Kconfig new file mode 100644 index 000000000000..2f7111b7af62 --- /dev/null +++ b/drivers/acpi/hmat/Kconfig @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +config ACPI_HMAT + bool "ACPI Heterogeneous Memory Attribute Table Support" + depends on ACPI_NUMA + help + If set, this option has the kernel parse and report the + platform's ACPI HMAT (Heterogeneous Memory Attributes Table). diff --git a/drivers/acpi/hmat/Makefile b/drivers/acpi/hmat/Makefile new file mode 100644 index 000000000000..e909051d3d00 --- /dev/null +++ b/drivers/acpi/hmat/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_ACPI_HMAT) := hmat.o diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c new file mode 100644 index 000000000000..4758beb3b2c1 --- /dev/null +++ b/drivers/acpi/hmat/hmat.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019, Intel Corporation. + * + * Heterogeneous Memory Attributes Table (HMAT) representation + * + * This program parses and reports the platform's HMAT tables, and registers + * the applicable attributes with the node's interfaces. + */ + +#include <linux/acpi.h> +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/node.h> +#include <linux/sysfs.h> + +static __initdata u8 hmat_revision; + +static __init const char *hmat_data_type(u8 type) +{ + switch (type) { + case ACPI_HMAT_ACCESS_LATENCY: + return "Access Latency"; + case ACPI_HMAT_READ_LATENCY: + return "Read Latency"; + case ACPI_HMAT_WRITE_LATENCY: + return "Write Latency"; + case ACPI_HMAT_ACCESS_BANDWIDTH: + return "Access Bandwidth"; + case ACPI_HMAT_READ_BANDWIDTH: + return "Read Bandwidth"; + case ACPI_HMAT_WRITE_BANDWIDTH: + return "Write Bandwidth"; + default: + return "Reserved"; + } +} + +static __init const char *hmat_data_type_suffix(u8 type) +{ + switch (type) { + case ACPI_HMAT_ACCESS_LATENCY: + case ACPI_HMAT_READ_LATENCY: + case ACPI_HMAT_WRITE_LATENCY: + return " nsec"; + case ACPI_HMAT_ACCESS_BANDWIDTH: + case ACPI_HMAT_READ_BANDWIDTH: + case ACPI_HMAT_WRITE_BANDWIDTH: + return " MB/s"; + default: + return ""; + } +} + +static __init u32 hmat_normalize(u16 entry, u64 base, u8 type) +{ + u32 value; + + /* + * Check for invalid and overflow values + */ + if (entry == 0xffff || !entry) + return 0; + else if (base > (UINT_MAX / (entry))) + return 0; + + /* + * Divide by the base unit for version 1, convert latency from + * picosenonds to nanoseconds if revision 2. + */ + value = entry * base; + if (hmat_revision == 1) { + if (value < 10) + return 0; + value = DIV_ROUND_UP(value, 10); + } else if (hmat_revision == 2) { + switch (type) { + case ACPI_HMAT_ACCESS_LATENCY: + case ACPI_HMAT_READ_LATENCY: + case ACPI_HMAT_WRITE_LATENCY: + value = DIV_ROUND_UP(value, 1000); + break; + default: + break; + } + } + return value; +} + +static __init int hmat_parse_locality(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_hmat_locality *hmat_loc = (void *)header; + unsigned int init, targ, total_size, ipds, tpds; + u32 *inits, *targs, value; + u16 *entries; + u8 type; + + if (hmat_loc->header.length < sizeof(*hmat_loc)) { + pr_notice("HMAT: Unexpected locality header length: %d\n", + hmat_loc->header.length); + return -EINVAL; + } + + type = hmat_loc->data_type; + ipds = hmat_loc->number_of_initiator_Pds; + tpds = hmat_loc->number_of_target_Pds; + total_size = sizeof(*hmat_loc) + sizeof(*entries) * ipds * tpds + + sizeof(*inits) * ipds + sizeof(*targs) * tpds; + if (hmat_loc->header.length < total_size) { + pr_notice("HMAT: Unexpected locality header length:%d, minimum required:%d\n", + hmat_loc->header.length, total_size); + return -EINVAL; + } + + pr_info("HMAT: Locality: Flags:%02x Type:%s Initiator Domains:%d Target Domains:%d Base:%lld\n", + hmat_loc->flags, hmat_data_type(type), ipds, tpds, + hmat_loc->entry_base_unit); + + inits = (u32 *)(hmat_loc + 1); + targs = inits + ipds; + entries = (u16 *)(targs + tpds); + for (init = 0; init < ipds; init++) { + for (targ = 0; targ < tpds; targ++) { + value = hmat_normalize(entries[init * tpds + targ], + hmat_loc->entry_base_unit, + type); + pr_info(" Initiator-Target[%d-%d]:%d%s\n", + inits[init], targs[targ], value, + hmat_data_type_suffix(type)); + } + } + + return 0; +} + +static __init int hmat_parse_cache(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_hmat_cache *cache = (void *)header; + u32 attrs; + + if (cache->header.length < sizeof(*cache)) { + pr_notice("HMAT: Unexpected cache header length: %d\n", + cache->header.length); + return -EINVAL; + } + + attrs = cache->cache_attributes; + pr_info("HMAT: Cache: Domain:%d Size:%llu Attrs:%08x SMBIOS Handles:%d\n", + cache->memory_PD, cache->cache_size, attrs, + cache->number_of_SMBIOShandles); + + return 0; +} + +static int __init hmat_parse_proximity_domain(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_hmat_proximity_domain *p = (void *)header; + + if (p->header.length != sizeof(*p)) { + pr_notice("HMAT: Unexpected address range header length: %d\n", + p->header.length); + return -EINVAL; + } + + if (hmat_revision == 1) + pr_info("HMAT: Memory (%#llx length %#llx) Flags:%04x Processor Domain:%d Memory Domain:%d\n", + p->reserved3, p->reserved4, p->flags, p->processor_PD, + p->memory_PD); + else + pr_info("HMAT: Memory Flags:%04x Processor Domain:%d Memory Domain:%d\n", + p->flags, p->processor_PD, p->memory_PD); + + return 0; +} + +static int __init hmat_parse_subtable(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_hmat_structure *hdr = (void *)header; + + if (!hdr) + return -EINVAL; + + switch (hdr->type) { + case ACPI_HMAT_TYPE_ADDRESS_RANGE: + return hmat_parse_proximity_domain(header, end); + case ACPI_HMAT_TYPE_LOCALITY: + return hmat_parse_locality(header, end); + case ACPI_HMAT_TYPE_CACHE: + return hmat_parse_cache(header, end); + default: + return -EINVAL; + } +} + +static __init int hmat_init(void) +{ + struct acpi_table_header *tbl; + enum acpi_hmat_type i; + acpi_status status; + + if (srat_disabled()) + return 0; + + status = acpi_get_table(ACPI_SIG_HMAT, 0, &tbl); + if (ACPI_FAILURE(status)) + return 0; + + hmat_revision = tbl->revision; + switch (hmat_revision) { + case 1: + case 2: + break; + default: + pr_notice("Ignoring HMAT: Unknown revision:%d\n", hmat_revision); + goto out_put; + } + + for (i = ACPI_HMAT_TYPE_ADDRESS_RANGE; i < ACPI_HMAT_TYPE_RESERVED; i++) { + if (acpi_table_parse_entries(ACPI_SIG_HMAT, + sizeof(struct acpi_table_hmat), i, + hmat_parse_subtable, 0) < 0) { + pr_notice("Ignoring HMAT: Invalid table"); + goto out_put; + } + } +out_put: + acpi_put_table(tbl); + return 0; +} +subsys_initcall(hmat_init);