From: Jeremy Linton <jeremy.linton@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, mark.rutland@arm.com, sudeep.holla@arm.com, james.morse@arm.com, lorenzo.pieralisi@arm.com, linuxarm@huawei.com, Jeremy Linton <jeremy.linton@arm.com> Subject: [PATCH 1/4] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Tue, 26 Mar 2019 17:39:35 -0500 [thread overview] Message-ID: <20190326223938.5365-2-jeremy.linton@arm.com> (raw) In-Reply-To: <20190326223938.5365-1-jeremy.linton@arm.com> 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 065c4fc245d1..472c95ec816b 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() - Determine a unique implementation + * @cpu: Kernel logical cpu number + * + * Determine a unique heterogeneous ID for the given CPU. CPUs with the same + * implementation should have matching IDs. Since this is a tree we can only + * detect implementations where the heterogeneous flag is the parent to all + * matching cores. AKA if a two socket machine has two different core types + * in each socket this will end up being represented as four unique core types + * rather than two. + * + * The returned ID 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. + * + * 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 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; -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Linton <jeremy.linton@arm.com> To: 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, linux-kernel@vger.kernel.org, Jeremy Linton <jeremy.linton@arm.com>, linuxarm@huawei.com, linux-acpi@vger.kernel.org, james.morse@arm.com, catalin.marinas@arm.com, lenb@kernel.org Subject: [PATCH 1/4] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Tue, 26 Mar 2019 17:39:35 -0500 [thread overview] Message-ID: <20190326223938.5365-2-jeremy.linton@arm.com> (raw) In-Reply-To: <20190326223938.5365-1-jeremy.linton@arm.com> 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 065c4fc245d1..472c95ec816b 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() - Determine a unique implementation + * @cpu: Kernel logical cpu number + * + * Determine a unique heterogeneous ID for the given CPU. CPUs with the same + * implementation should have matching IDs. Since this is a tree we can only + * detect implementations where the heterogeneous flag is the parent to all + * matching cores. AKA if a two socket machine has two different core types + * in each socket this will end up being represented as four unique core types + * rather than two. + * + * The returned ID 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. + * + * 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 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; -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-03-26 22:39 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-03-26 22:39 [PATCH 0/4] arm64: SPE ACPI enablement Jeremy Linton 2019-03-26 22:39 ` Jeremy Linton 2019-03-26 22:39 ` Jeremy Linton [this message] 2019-03-26 22:39 ` [PATCH 1/4] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Jeremy Linton 2019-03-28 10:04 ` Rafael J. Wysocki 2019-03-28 10:04 ` Rafael J. Wysocki 2019-03-28 15:20 ` Jeremy Linton 2019-03-28 15:20 ` Jeremy Linton 2019-03-26 22:39 ` [PATCH 2/4] ACPI/PPTT: Modify node flag detection to find last IDENTICAL Jeremy Linton 2019-03-26 22:39 ` Jeremy Linton 2019-03-26 22:39 ` [PATCH 3/4] arm_pmu: acpi: spe: Add initial MADT/SPE probing Jeremy Linton 2019-03-26 22:39 ` Jeremy Linton 2019-03-28 12:40 ` John Garry 2019-03-28 12:40 ` John Garry 2019-03-28 12:40 ` John Garry 2019-04-02 19:14 ` Jeremy Linton 2019-04-02 19:14 ` Jeremy Linton 2019-04-05 9:23 ` John Garry 2019-04-05 9:23 ` John Garry 2019-04-05 9:23 ` John Garry 2019-03-26 22:39 ` [PATCH 4/4] perf: arm_spe: Enable ACPI/Platform automatic module loading Jeremy Linton 2019-03-26 22:39 ` Jeremy Linton 2019-04-04 17:04 ` Will Deacon 2019-04-04 17:04 ` Will Deacon 2019-04-04 17:24 ` Jeremy Linton 2019-04-04 17:24 ` Jeremy Linton 2019-04-16 13:50 ` Will Deacon 2019-04-16 13:50 ` Will Deacon 2019-04-26 0:58 ` Jeremy Linton 2019-04-26 0:58 ` Jeremy Linton 2019-04-26 8:04 ` Will Deacon 2019-04-26 8:04 ` Will Deacon
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