From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Jeremy Linton <jeremy.linton@arm.com>, linux-arm-kernel@lists.infradead.org Cc: mark.rutland@arm.com, lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, linuxarm@huawei.com, linux-acpi@vger.kernel.org, sudeep.holla@arm.com, lenb@kernel.org Subject: Re: [PATCH v3 2/5] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Sun, 5 May 2019 15:09:01 +0800 [thread overview] Message-ID: <b52d15ab-de9c-8aa4-d2a4-dacdcb9d137e@huawei.com> (raw) In-Reply-To: <20190503232407.37195-3-jeremy.linton@arm.com> On 2019/5/4 7:24, Jeremy Linton wrote: > ACPI 6.3 adds a flag to indicate that child nodes are all > identical cores. This is useful to authoritatively determine > if a set of (possibly offline) cores are identical or not. > > Since the flag doesn't give us a unique id we can generate > one and use it to create bitmaps of sibling nodes, or simply > in a loop to determine if a subset of cores are identical. > > Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> > --- > drivers/acpi/pptt.c | 26 ++++++++++++++++++++++++++ > include/linux/acpi.h | 5 +++++ > 2 files changed, 31 insertions(+) > > diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c > index 83a026765faa..1865515297ca 100644 > --- a/drivers/acpi/pptt.c > +++ b/drivers/acpi/pptt.c > @@ -660,3 +660,29 @@ int find_acpi_cpu_topology_package(unsigned int cpu) > return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, > ACPI_PPTT_PHYSICAL_PACKAGE); > } > + > +/** > + * find_acpi_cpu_topology_hetero_id() - Get a core architecture tag > + * @cpu: Kernel logical CPU number > + * > + * Determine a unique heterogeneous tag for the given CPU. CPUs with the same > + * implementation should have matching tags. > + * > + * The returned tag can be used to group peers with identical implementation. > + * > + * The search terminates when a level is found with the identical implementation > + * flag set or we reach a root node. > + * > + * Due to limitations in the PPTT data structure, there may be rare situations > + * where two cores in a heterogeneous machine may be identical, but won't have > + * the same tag. > + * > + * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found. > + * Otherwise returns a value which represents a group of identical cores > + * similar to this CPU. > + */ > +int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +{ > + return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, > + ACPI_PPTT_ACPI_IDENTICAL); > +} > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index d5dcebd7aad3..1444fb042898 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -1309,6 +1309,7 @@ static inline int lpit_read_residency_count_address(u64 *address) > #ifdef CONFIG_ACPI_PPTT > int find_acpi_cpu_topology(unsigned int cpu, int level); > int find_acpi_cpu_topology_package(unsigned int cpu); > +int find_acpi_cpu_topology_hetero_id(unsigned int cpu); > int find_acpi_cpu_cache_topology(unsigned int cpu, int level); > #else > static inline int find_acpi_cpu_topology(unsigned int cpu, int level) > @@ -1319,6 +1320,10 @@ static inline int find_acpi_cpu_topology_package(unsigned int cpu) > { > return -EINVAL; > } static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +static int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +{ > + return -EINVAL; > +} > static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level) > { > return -EINVAL;
WARNING: multiple messages have this Message-ID (diff)
From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Jeremy Linton <jeremy.linton@arm.com>, <linux-arm-kernel@lists.infradead.org> Cc: <mark.rutland@arm.com>, <lorenzo.pieralisi@arm.com>, <will.deacon@arm.com>, <sudeep.holla@arm.com>, <rjw@rjwysocki.net>, <linuxarm@huawei.com>, <linux-acpi@vger.kernel.org>, <catalin.marinas@arm.com>, <lenb@kernel.org> Subject: Re: [PATCH v3 2/5] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Sun, 5 May 2019 15:09:01 +0800 [thread overview] Message-ID: <b52d15ab-de9c-8aa4-d2a4-dacdcb9d137e@huawei.com> (raw) Message-ID: <20190505070901.AqqwQ0SFxag6BDuokrQP_6gSQvESTtNsTWTn6DWVHzs@z> (raw) In-Reply-To: <20190503232407.37195-3-jeremy.linton@arm.com> On 2019/5/4 7:24, Jeremy Linton wrote: > ACPI 6.3 adds a flag to indicate that child nodes are all > identical cores. This is useful to authoritatively determine > if a set of (possibly offline) cores are identical or not. > > Since the flag doesn't give us a unique id we can generate > one and use it to create bitmaps of sibling nodes, or simply > in a loop to determine if a subset of cores are identical. > > Signed-off-by: Jeremy Linton <jeremy.linton@arm.com> > --- > drivers/acpi/pptt.c | 26 ++++++++++++++++++++++++++ > include/linux/acpi.h | 5 +++++ > 2 files changed, 31 insertions(+) > > diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c > index 83a026765faa..1865515297ca 100644 > --- a/drivers/acpi/pptt.c > +++ b/drivers/acpi/pptt.c > @@ -660,3 +660,29 @@ int find_acpi_cpu_topology_package(unsigned int cpu) > return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, > ACPI_PPTT_PHYSICAL_PACKAGE); > } > + > +/** > + * find_acpi_cpu_topology_hetero_id() - Get a core architecture tag > + * @cpu: Kernel logical CPU number > + * > + * Determine a unique heterogeneous tag for the given CPU. CPUs with the same > + * implementation should have matching tags. > + * > + * The returned tag can be used to group peers with identical implementation. > + * > + * The search terminates when a level is found with the identical implementation > + * flag set or we reach a root node. > + * > + * Due to limitations in the PPTT data structure, there may be rare situations > + * where two cores in a heterogeneous machine may be identical, but won't have > + * the same tag. > + * > + * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found. > + * Otherwise returns a value which represents a group of identical cores > + * similar to this CPU. > + */ > +int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +{ > + return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, > + ACPI_PPTT_ACPI_IDENTICAL); > +} > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index d5dcebd7aad3..1444fb042898 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -1309,6 +1309,7 @@ static inline int lpit_read_residency_count_address(u64 *address) > #ifdef CONFIG_ACPI_PPTT > int find_acpi_cpu_topology(unsigned int cpu, int level); > int find_acpi_cpu_topology_package(unsigned int cpu); > +int find_acpi_cpu_topology_hetero_id(unsigned int cpu); > int find_acpi_cpu_cache_topology(unsigned int cpu, int level); > #else > static inline int find_acpi_cpu_topology(unsigned int cpu, int level) > @@ -1319,6 +1320,10 @@ static inline int find_acpi_cpu_topology_package(unsigned int cpu) > { > return -EINVAL; > } static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +static int find_acpi_cpu_topology_hetero_id(unsigned int cpu) > +{ > + return -EINVAL; > +} > static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level) > { > return -EINVAL;
next prev parent reply other threads:[~2019-05-05 7:09 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-03 23:24 [PATCH v3 0/5] arm64: SPE ACPI enablement Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-05-03 23:24 ` [PATCH v3 1/5] ACPI/PPTT: Trivial, change the capitalization of CPU Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-05-07 18:12 ` Jeremy Linton 2019-05-07 18:12 ` Jeremy Linton 2019-05-03 23:24 ` [PATCH v3 2/5] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-05-05 7:09 ` Kefeng Wang [this message] 2019-05-05 7:09 ` Kefeng Wang 2019-05-07 18:26 ` Jeremy Linton 2019-05-07 18:26 ` Jeremy Linton 2019-06-07 9:49 ` Sudeep Holla 2019-05-03 23:24 ` [PATCH v3 3/5] ACPI/PPTT: Modify node flag detection to find last IDENTICAL Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-06-07 9:53 ` Sudeep Holla 2019-06-07 13:15 ` Jeremy Linton 2019-06-07 13:47 ` Sudeep Holla 2019-05-03 23:24 ` [PATCH v3 4/5] arm_pmu: acpi: spe: Add initial MADT/SPE probing Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-05-08 11:18 ` John Garry 2019-05-08 20:04 ` Jeremy Linton 2019-06-07 9:57 ` Sudeep Holla 2019-06-07 13:28 ` Jeremy Linton 2019-06-07 13:37 ` Sudeep Holla 2019-05-03 23:24 ` [PATCH v3 5/5] perf: arm_spe: Enable ACPI/Platform automatic module loading Jeremy Linton 2019-05-03 23:24 ` Jeremy Linton 2019-05-04 11:06 ` [PATCH v3 0/5] arm64: SPE ACPI enablement Hanjun Guo 2019-05-04 11:06 ` Hanjun Guo 2019-05-07 17:58 ` Jeremy Linton 2019-05-07 17:58 ` Jeremy Linton 2019-05-08 9:35 ` Hanjun Guo 2019-05-08 16:51 ` Sudeep Holla 2019-05-09 9:28 ` Will Deacon 2019-05-09 10:35 ` Sudeep Holla 2019-05-09 14:13 ` Sudeep Holla 2019-05-13 10:56 ` Will Deacon 2019-05-13 11:31 ` Sudeep Holla 2019-05-13 11:10 ` Hanjun Guo 2019-05-08 16:45 ` Sudeep Holla
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