From: Gavin Shan <gshan@redhat.com>
To: Sudeep Holla <sudeep.holla@arm.com>, linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@atishpatra.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v3 04/16] cacheinfo: Add support to check if last level cache(LLC) is valid or shared
Date: Wed, 1 Jun 2022 11:20:12 +0800 [thread overview]
Message-ID: <bf63ca22-944d-b709-242f-fd09c66ff519@redhat.com> (raw)
In-Reply-To: <20220525081416.3306043-5-sudeep.holla@arm.com>
Hi Sudeep,
On 5/25/22 4:14 PM, Sudeep Holla wrote:
> It is useful to have helper to check if the given two CPUs share last level
> cache. We can do that check by comparing fw_token or by comparing the cache
> ID. Currently we check just for fw_token as the cache ID is optional.
>
> This helper can be used to build the llc_sibling during arch specific
> topology parsing and feeding information to the sched_domains. This also
> helps to get rid of llc_id in the CPU topology as it is sort of duplicate
> information.
>
> Also add helper to check if the llc information in cacheinfo is valid or not.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/base/cacheinfo.c | 26 ++++++++++++++++++++++++++
> include/linux/cacheinfo.h | 2 ++
> 2 files changed, 28 insertions(+)
>
With below nits fixed:
Reviewed-by: Gavin Shan <gshan@redhat.com>
> diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
> index 417e1ebf5525..ed74db18468f 100644
> --- a/drivers/base/cacheinfo.c
> +++ b/drivers/base/cacheinfo.c
> @@ -47,6 +47,32 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
> return sib_leaf->fw_token == this_leaf->fw_token;
> }
>
> +bool last_level_cache_is_valid(unsigned int cpu)
> +{
> + struct cacheinfo *llc;
> +
> + if (!cache_leaves(cpu))
> + return false;
> +
> + llc = per_cpu_cacheinfo_idx(cpu, cache_leaves(cpu) - 1);
> +
> + return llc->fw_token;
> +}
> +
return !!llc->fw_token;
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y)
> +{
> + struct cacheinfo *llc_x, *llc_y;
> +
> + if (!last_level_cache_is_valid(cpu_x) ||
> + !last_level_cache_is_valid(cpu_y))
> + return false;
> +
> + llc_x = per_cpu_cacheinfo_idx(cpu_x, cache_leaves(cpu_x) - 1);
> + llc_y = per_cpu_cacheinfo_idx(cpu_y, cache_leaves(cpu_y) - 1);
> +
> + return cache_leaves_are_shared(llc_x, llc_y);
> +}
> +
> #ifdef CONFIG_OF
> /* OF properties to query for a given cache type */
> struct cache_type_info {
> diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
> index 4ff37cb763ae..7e429bc5c1a4 100644
> --- a/include/linux/cacheinfo.h
> +++ b/include/linux/cacheinfo.h
> @@ -82,6 +82,8 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
> int init_cache_level(unsigned int cpu);
> int populate_cache_leaves(unsigned int cpu);
> int cache_setup_acpi(unsigned int cpu);
> +bool last_level_cache_is_valid(unsigned int cpu);
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y);
> #ifndef CONFIG_ACPI_PPTT
> /*
> * acpi_find_last_cache_level is only called on ACPI enabled
>
Thanks,
Gavin
WARNING: multiple messages have this Message-ID (diff)
From: Gavin Shan <gshan@redhat.com>
To: Sudeep Holla <sudeep.holla@arm.com>, linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@atishpatra.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v3 04/16] cacheinfo: Add support to check if last level cache(LLC) is valid or shared
Date: Wed, 1 Jun 2022 11:20:12 +0800 [thread overview]
Message-ID: <bf63ca22-944d-b709-242f-fd09c66ff519@redhat.com> (raw)
In-Reply-To: <20220525081416.3306043-5-sudeep.holla@arm.com>
Hi Sudeep,
On 5/25/22 4:14 PM, Sudeep Holla wrote:
> It is useful to have helper to check if the given two CPUs share last level
> cache. We can do that check by comparing fw_token or by comparing the cache
> ID. Currently we check just for fw_token as the cache ID is optional.
>
> This helper can be used to build the llc_sibling during arch specific
> topology parsing and feeding information to the sched_domains. This also
> helps to get rid of llc_id in the CPU topology as it is sort of duplicate
> information.
>
> Also add helper to check if the llc information in cacheinfo is valid or not.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/base/cacheinfo.c | 26 ++++++++++++++++++++++++++
> include/linux/cacheinfo.h | 2 ++
> 2 files changed, 28 insertions(+)
>
With below nits fixed:
Reviewed-by: Gavin Shan <gshan@redhat.com>
> diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
> index 417e1ebf5525..ed74db18468f 100644
> --- a/drivers/base/cacheinfo.c
> +++ b/drivers/base/cacheinfo.c
> @@ -47,6 +47,32 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
> return sib_leaf->fw_token == this_leaf->fw_token;
> }
>
> +bool last_level_cache_is_valid(unsigned int cpu)
> +{
> + struct cacheinfo *llc;
> +
> + if (!cache_leaves(cpu))
> + return false;
> +
> + llc = per_cpu_cacheinfo_idx(cpu, cache_leaves(cpu) - 1);
> +
> + return llc->fw_token;
> +}
> +
return !!llc->fw_token;
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y)
> +{
> + struct cacheinfo *llc_x, *llc_y;
> +
> + if (!last_level_cache_is_valid(cpu_x) ||
> + !last_level_cache_is_valid(cpu_y))
> + return false;
> +
> + llc_x = per_cpu_cacheinfo_idx(cpu_x, cache_leaves(cpu_x) - 1);
> + llc_y = per_cpu_cacheinfo_idx(cpu_y, cache_leaves(cpu_y) - 1);
> +
> + return cache_leaves_are_shared(llc_x, llc_y);
> +}
> +
> #ifdef CONFIG_OF
> /* OF properties to query for a given cache type */
> struct cache_type_info {
> diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
> index 4ff37cb763ae..7e429bc5c1a4 100644
> --- a/include/linux/cacheinfo.h
> +++ b/include/linux/cacheinfo.h
> @@ -82,6 +82,8 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
> int init_cache_level(unsigned int cpu);
> int populate_cache_leaves(unsigned int cpu);
> int cache_setup_acpi(unsigned int cpu);
> +bool last_level_cache_is_valid(unsigned int cpu);
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y);
> #ifndef CONFIG_ACPI_PPTT
> /*
> * acpi_find_last_cache_level is only called on ACPI enabled
>
Thanks,
Gavin
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Gavin Shan <gshan@redhat.com>
To: Sudeep Holla <sudeep.holla@arm.com>, linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@atishpatra.org>,
Atish Patra <atishp@rivosinc.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Qing Wang <wangqing@vivo.com>,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v3 04/16] cacheinfo: Add support to check if last level cache(LLC) is valid or shared
Date: Wed, 1 Jun 2022 11:20:12 +0800 [thread overview]
Message-ID: <bf63ca22-944d-b709-242f-fd09c66ff519@redhat.com> (raw)
In-Reply-To: <20220525081416.3306043-5-sudeep.holla@arm.com>
Hi Sudeep,
On 5/25/22 4:14 PM, Sudeep Holla wrote:
> It is useful to have helper to check if the given two CPUs share last level
> cache. We can do that check by comparing fw_token or by comparing the cache
> ID. Currently we check just for fw_token as the cache ID is optional.
>
> This helper can be used to build the llc_sibling during arch specific
> topology parsing and feeding information to the sched_domains. This also
> helps to get rid of llc_id in the CPU topology as it is sort of duplicate
> information.
>
> Also add helper to check if the llc information in cacheinfo is valid or not.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> ---
> drivers/base/cacheinfo.c | 26 ++++++++++++++++++++++++++
> include/linux/cacheinfo.h | 2 ++
> 2 files changed, 28 insertions(+)
>
With below nits fixed:
Reviewed-by: Gavin Shan <gshan@redhat.com>
> diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
> index 417e1ebf5525..ed74db18468f 100644
> --- a/drivers/base/cacheinfo.c
> +++ b/drivers/base/cacheinfo.c
> @@ -47,6 +47,32 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
> return sib_leaf->fw_token == this_leaf->fw_token;
> }
>
> +bool last_level_cache_is_valid(unsigned int cpu)
> +{
> + struct cacheinfo *llc;
> +
> + if (!cache_leaves(cpu))
> + return false;
> +
> + llc = per_cpu_cacheinfo_idx(cpu, cache_leaves(cpu) - 1);
> +
> + return llc->fw_token;
> +}
> +
return !!llc->fw_token;
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y)
> +{
> + struct cacheinfo *llc_x, *llc_y;
> +
> + if (!last_level_cache_is_valid(cpu_x) ||
> + !last_level_cache_is_valid(cpu_y))
> + return false;
> +
> + llc_x = per_cpu_cacheinfo_idx(cpu_x, cache_leaves(cpu_x) - 1);
> + llc_y = per_cpu_cacheinfo_idx(cpu_y, cache_leaves(cpu_y) - 1);
> +
> + return cache_leaves_are_shared(llc_x, llc_y);
> +}
> +
> #ifdef CONFIG_OF
> /* OF properties to query for a given cache type */
> struct cache_type_info {
> diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
> index 4ff37cb763ae..7e429bc5c1a4 100644
> --- a/include/linux/cacheinfo.h
> +++ b/include/linux/cacheinfo.h
> @@ -82,6 +82,8 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
> int init_cache_level(unsigned int cpu);
> int populate_cache_leaves(unsigned int cpu);
> int cache_setup_acpi(unsigned int cpu);
> +bool last_level_cache_is_valid(unsigned int cpu);
> +bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y);
> #ifndef CONFIG_ACPI_PPTT
> /*
> * acpi_find_last_cache_level is only called on ACPI enabled
>
Thanks,
Gavin
_______________________________________________
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:[~2022-06-01 3:20 UTC|newest]
Thread overview: 153+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 8:14 [PATCH v3 00/16] arch_topology: Updates to add socket support and fix cluster ids Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 01/16] cacheinfo: Use of_cpu_device_node_get instead cpu_dev->of_node Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 02/16] cacheinfo: Add helper to access any cache index for a given CPU Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 03/16] cacheinfo: Move cache_leaves_are_shared out of CONFIG_OF Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 04/16] cacheinfo: Add support to check if last level cache(LLC) is valid or shared Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 05/16] cacheinfo: Allow early detection and population of cache attributes Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 06/16] arch_topology: Add support to parse and detect " Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 07/16] arch_topology: Use the last level cache information from the cacheinfo Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 08/16] arm64: topology: Remove redundant setting of llc_id in CPU topology Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 09/16] arch_topology: Drop LLC identifier stash from the " Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 10/16] arch_topology: Set thread sibling cpumask only within the cluster Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 11/16] arch_topology: Check for non-negative value rather than -1 for IDs validity Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 12/16] arch_topology: Avoid parsing through all the CPUs once a outlier CPU is found Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 13/16] arch_topology: Don't set cluster identifier as physical package identifier Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 14/16] arch_topology: Drop unnecessary check for uninitialised package_id Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 15/16] arch_topology: Set cluster identifier in each core/thread from /cpu-map Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` [PATCH v3 16/16] arch_topology: Add support for parsing sockets in /cpu-map Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-05-25 8:14 ` Sudeep Holla
2022-06-03 12:30 ` [PATCH v3 15/16] arch_topology: Set cluster identifier in each core/thread from /cpu-map Dietmar Eggemann
2022-06-03 12:30 ` Dietmar Eggemann
2022-06-03 12:30 ` Dietmar Eggemann
2022-06-06 10:21 ` Sudeep Holla
2022-06-06 10:21 ` Sudeep Holla
2022-06-06 10:21 ` Sudeep Holla
2022-06-10 10:08 ` Vincent Guittot
2022-06-10 10:08 ` Vincent Guittot
2022-06-10 10:08 ` Vincent Guittot
2022-06-10 10:27 ` Sudeep Holla
2022-06-10 10:27 ` Sudeep Holla
2022-06-10 10:27 ` Sudeep Holla
2022-06-13 9:19 ` Dietmar Eggemann
2022-06-13 9:19 ` Dietmar Eggemann
2022-06-13 9:19 ` Dietmar Eggemann
2022-06-13 11:17 ` Sudeep Holla
2022-06-13 11:17 ` Sudeep Holla
2022-06-13 11:17 ` Sudeep Holla
2022-06-16 16:02 ` Dietmar Eggemann
2022-06-16 16:02 ` Dietmar Eggemann
2022-06-16 16:02 ` Dietmar Eggemann
2022-06-17 11:16 ` Sudeep Holla
2022-06-17 11:16 ` Sudeep Holla
2022-06-17 11:16 ` Sudeep Holla
2022-06-20 13:27 ` Dietmar Eggemann
2022-06-20 13:27 ` Dietmar Eggemann
2022-06-20 13:27 ` Dietmar Eggemann
2022-06-21 16:00 ` Sudeep Holla
2022-06-21 16:00 ` Sudeep Holla
2022-06-21 16:00 ` Sudeep Holla
2022-06-14 17:59 ` Vincent Guittot
2022-06-14 17:59 ` Vincent Guittot
2022-06-14 17:59 ` Vincent Guittot
2022-06-15 17:00 ` Sudeep Holla
2022-06-15 17:00 ` Sudeep Holla
2022-06-15 17:00 ` Sudeep Holla
2022-06-15 22:44 ` Vincent Guittot
2022-06-15 22:44 ` Vincent Guittot
2022-06-15 22:44 ` Vincent Guittot
2022-06-15 22:45 ` Vincent Guittot
2022-06-15 22:45 ` Vincent Guittot
2022-06-15 22:45 ` Vincent Guittot
2022-06-01 3:40 ` [PATCH v3 12/16] arch_topology: Avoid parsing through all the CPUs once a outlier CPU is found Gavin Shan
2022-06-01 3:40 ` Gavin Shan
2022-06-01 3:40 ` Gavin Shan
2022-06-01 3:38 ` [PATCH v3 11/16] arch_topology: Check for non-negative value rather than -1 for IDs validity Gavin Shan
2022-06-01 3:38 ` Gavin Shan
2022-06-01 3:38 ` Gavin Shan
2022-06-01 3:36 ` [PATCH v3 10/16] arch_topology: Set thread sibling cpumask only within the cluster Gavin Shan
2022-06-01 3:36 ` Gavin Shan
2022-06-01 3:36 ` Gavin Shan
2022-06-01 3:35 ` [PATCH v3 09/16] arch_topology: Drop LLC identifier stash from the CPU topology Gavin Shan
2022-06-01 3:35 ` Gavin Shan
2022-06-01 3:35 ` Gavin Shan
2022-06-01 12:06 ` Sudeep Holla
2022-06-01 12:06 ` Sudeep Holla
2022-06-01 12:06 ` Sudeep Holla
2022-06-02 6:44 ` Gavin Shan
2022-06-02 6:44 ` Gavin Shan
2022-06-02 6:44 ` Gavin Shan
2022-06-02 6:42 ` Gavin Shan
2022-06-02 6:42 ` Gavin Shan
2022-06-02 6:42 ` Gavin Shan
2022-06-02 6:42 ` [PATCH v3 08/16] arm64: topology: Remove redundant setting of llc_id in " Gavin Shan
2022-06-02 6:42 ` Gavin Shan
2022-06-02 6:42 ` Gavin Shan
2022-06-01 3:31 ` [PATCH v3 07/16] arch_topology: Use the last level cache information from the cacheinfo Gavin Shan
2022-06-01 3:31 ` Gavin Shan
2022-06-01 3:31 ` Gavin Shan
2022-06-02 14:26 ` Dietmar Eggemann
2022-06-02 14:26 ` Dietmar Eggemann
2022-06-02 14:26 ` Dietmar Eggemann
2022-06-06 9:54 ` Sudeep Holla
2022-06-06 9:54 ` Sudeep Holla
2022-06-06 9:54 ` Sudeep Holla
2022-06-01 3:29 ` [PATCH v3 06/16] arch_topology: Add support to parse and detect cache attributes Gavin Shan
2022-06-01 3:29 ` Gavin Shan
2022-06-01 3:29 ` Gavin Shan
2022-06-01 3:25 ` [PATCH v3 05/16] cacheinfo: Allow early detection and population of " Gavin Shan
2022-06-01 3:25 ` Gavin Shan
2022-06-01 3:25 ` Gavin Shan
2022-06-01 3:20 ` Gavin Shan [this message]
2022-06-01 3:20 ` [PATCH v3 04/16] cacheinfo: Add support to check if last level cache(LLC) is valid or shared Gavin Shan
2022-06-01 3:20 ` Gavin Shan
2022-06-01 2:51 ` [PATCH v3 03/16] cacheinfo: Move cache_leaves_are_shared out of CONFIG_OF Gavin Shan
2022-06-01 2:51 ` Gavin Shan
2022-06-01 2:51 ` Gavin Shan
2022-06-01 2:44 ` [PATCH v3 02/16] cacheinfo: Add helper to access any cache index for a given CPU Gavin Shan
2022-06-01 2:44 ` Gavin Shan
2022-06-01 2:44 ` Gavin Shan
2022-06-01 12:45 ` Sudeep Holla
2022-06-01 12:45 ` Sudeep Holla
2022-06-01 12:45 ` Sudeep Holla
2022-06-01 2:45 ` [PATCH v3 01/16] cacheinfo: Use of_cpu_device_node_get instead cpu_dev->of_node Gavin Shan
2022-06-01 2:45 ` Gavin Shan
2022-06-01 2:45 ` Gavin Shan
2022-06-01 3:49 ` [PATCH v3 00/16] arch_topology: Updates to add socket support and fix cluster ids Gavin Shan
2022-06-01 3:49 ` Gavin Shan
2022-06-01 3:49 ` Gavin Shan
2022-06-01 12:03 ` Sudeep Holla
2022-06-01 12:03 ` Sudeep Holla
2022-06-01 12:03 ` Sudeep Holla
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