On 2/20/25 6:42 PM, Alison Schofield wrote: > On Fri, Jan 17, 2025 at 10:28:30AM -0700, Dave Jiang wrote: >> Store the address mode as part of the cache attriutes. Export the mode >> attribute to sysfs as all other cache attributes. >> >> Link: https://lore.kernel.org/linux-cxl/668333b17e4b2_5639294fd@xxxxxxxxxxxxxxxxxxxxxxxxx.notmuch/ >> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> >> Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx> >> --- >> Documentation/ABI/stable/sysfs-devices-node | 6 ++++++ >> drivers/acpi/numa/hmat.c | 5 +++++ >> drivers/base/node.c | 2 ++ >> include/linux/node.h | 7 +++++++ >> 4 files changed, 20 insertions(+) >> >> diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node >> index 402af4b2b905..c46b910dfe00 100644 >> --- a/Documentation/ABI/stable/sysfs-devices-node >> +++ b/Documentation/ABI/stable/sysfs-devices-node >> @@ -177,6 +177,12 @@ Description: >> The cache write policy: 0 for write-back, 1 for write-through, >> other or unknown. >> >> +What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/address_mode >> +Date: December 2024 >> +Contact: Dave Jiang <dave.jiang@xxxxxxxxx> >> +Description: >> + The address mode: 0 for reserved, 1 for extended-linear. >> + > > I was going to say something about the brevity of the description, > but when I looked in the file, I see this is like all the other > memory_side_cache descriptions. > > So - I'll just say - update that Date :) > > >> What: /sys/devices/system/node/nodeX/x86/sgx_total_bytes >> Date: November 2021 >> Contact: Jarkko Sakkinen <jarkko@xxxxxxxxxx> >> diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c >> index 80a3481c0470..a9172cf90002 100644 >> --- a/drivers/acpi/numa/hmat.c >> +++ b/drivers/acpi/numa/hmat.c >> @@ -506,6 +506,11 @@ static __init int hmat_parse_cache(union acpi_subtable_headers *header, >> switch ((attrs & ACPI_HMAT_CACHE_ASSOCIATIVITY) >> 8) { >> case ACPI_HMAT_CA_DIRECT_MAPPED: >> tcache->cache_attrs.indexing = NODE_CACHE_DIRECT_MAP; >> + /* Extended Linear mode is only valid if cache is direct mapped */ >> + if (cache->address_mode == ACPI_HMAT_CACHE_MODE_EXTENDED_LINEAR) { >> + tcache->cache_attrs.address_mode = >> + NODE_CACHE_ADDR_MODE_EXTENDED_LINEAR; >> + } >> break; >> case ACPI_HMAT_CA_COMPLEX_CACHE_INDEXING: >> tcache->cache_attrs.indexing = NODE_CACHE_INDEXED; >> diff --git a/drivers/base/node.c b/drivers/base/node.c >> index 0ea653fa3433..cd13ef287011 100644 >> --- a/drivers/base/node.c >> +++ b/drivers/base/node.c >> @@ -244,12 +244,14 @@ CACHE_ATTR(size, "%llu") >> CACHE_ATTR(line_size, "%u") >> CACHE_ATTR(indexing, "%u") >> CACHE_ATTR(write_policy, "%u") >> +CACHE_ATTR(address_mode, "%#x") > > why not "%u" fmt ? It's a bitfield value and not decimal. DJ > >> >> static struct attribute *cache_attrs[] = { >> &dev_attr_indexing.attr, >> &dev_attr_size.attr, >> &dev_attr_line_size.attr, >> &dev_attr_write_policy.attr, >> + &dev_attr_address_mode.attr, >> NULL, >> }; >> ATTRIBUTE_GROUPS(cache); >> diff --git a/include/linux/node.h b/include/linux/node.h >> index 9a881c2208b3..2b7517892230 100644 >> --- a/include/linux/node.h >> +++ b/include/linux/node.h >> @@ -57,6 +57,11 @@ enum cache_write_policy { >> NODE_CACHE_WRITE_OTHER, >> }; >> >> +enum cache_mode { >> + NODE_CACHE_ADDR_MODE_RESERVED, >> + NODE_CACHE_ADDR_MODE_EXTENDED_LINEAR, >> +}; >> + >> /** >> * struct node_cache_attrs - system memory caching attributes >> * >> @@ -65,6 +70,7 @@ enum cache_write_policy { >> * @size: Total size of cache in bytes >> * @line_size: Number of bytes fetched on a cache miss >> * @level: The cache hierarchy level >> + * @address_mode: The address mode >> */ >> struct node_cache_attrs { >> enum cache_indexing indexing; >> @@ -72,6 +78,7 @@ struct node_cache_attrs { >> u64 size; >> u16 line_size; >> u8 level; >> + u16 address_mode; >> }; >> >> #ifdef CONFIG_HMEM_REPORTING >> -- >> 2.47.1 >>
