On Fri, Sep 27, 2024 at 4:21 PM Dave Jiang <dave.jiang@xxxxxxxxx> wrote: > > ECN for "Extended-linear" addressing for direct-mapped memory-side caches > adds a field in the SRAT Memory Side CAche Information Structure to > indicate the address mode at the previously reserved bytes at offset 28. > > The field is described as: > When Address Mode is 1 'Extended-Linear' it indicates that the > associated address range (SRAT.MemoryAffinityStructure.Length) is > comprised of the backing store capacity extended by the cache > capacity. It is arranged such that there are N directly addressable > aliases of a given cacheline where N is an integer ratio of target memory > proximity domain size and the memory side cache size. Where the N > aliased addresses for a given cacheline all share the same result > for the operation 'address modulo cache size'. This setting is only > allowed when 'Cache Associativity' is 'Direct Map'." > > Link: https://lore.kernel.org/linux-cxl/668333b17e4b2_5639294fd@xxxxxxxxxxxxxxxxxxxxxxxxx.notmuch/ > Link: https://github.com/acpica/acpica/pull/961 This pull request has been merged into upstream ACPICA, so Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> and I'm assuming that it will be routed through the CXL tree along with the rest of the patch series. Thanks! > Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx> > --- > include/acpi/actbl1.h | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h > index 841ef9f22795..95ddc858a0c3 100644 > --- a/include/acpi/actbl1.h > +++ b/include/acpi/actbl1.h > @@ -1791,7 +1791,7 @@ struct acpi_hmat_cache { > u32 reserved1; > u64 cache_size; > u32 cache_attributes; > - u16 reserved2; > + u16 address_mode; > u16 number_of_SMBIOShandles; > }; > > @@ -1803,6 +1803,9 @@ struct acpi_hmat_cache { > #define ACPI_HMAT_WRITE_POLICY (0x0000F000) > #define ACPI_HMAT_CACHE_LINE_SIZE (0xFFFF0000) > > +#define ACPI_HMAT_CACHE_MODE_UNKNOWN (0) > +#define ACPI_HMAT_CACHE_MODE_EXTENDED_LINEAR (1) > + > /* Values for cache associativity flag */ > > #define ACPI_HMAT_CA_NONE (0) > -- > 2.46.1 >
