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From: Shaokun Zhang <zhangshaokun@hisilicon.com>
To: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Cc: Shaokun Zhang <zhangshaokun@hisilicon.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	"Sudeep Holla" <sudeep.holla@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Will Deacon <will.deacon@arm.com>
Subject: [PATCH v3 1/2] drivers: base: cacheinfo: Add variable to record max cache line size
Date: Mon, 27 May 2019 10:06:07 +0800	[thread overview]
Message-ID: <1558922768-29155-1-git-send-email-zhangshaokun@hisilicon.com> (raw)

Add coherency_max_size variable to record the maximum cache line size
for different cache levels. We will synchronize it with CTR_EL0.CWG
reporting in cache_line_size() for arm64.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
---
ChangeLog since v2:
  -- Rebase to 5.2-rc2
  -- Export cache_line_size for I/O driver
ChangeLog since v1:
  -- Move coherency_max_size to drivers/base/cacheinfo.c
  -- Address Catalin's comments
  Link: https://www.spinics.net/lists/arm-kernel/msg723615.html

 drivers/base/cacheinfo.c  | 5 +++++
 include/linux/cacheinfo.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index a7359535caf5..8827c60f51e2 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -213,6 +213,8 @@ int __weak cache_setup_acpi(unsigned int cpu)
 	return -ENOTSUPP;
 }
 
+unsigned int coherency_max_size;
+
 static int cache_shared_cpu_map_setup(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
@@ -251,6 +253,9 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
 				cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
 			}
 		}
+		/* record the maximum cache line size */
+		if (this_leaf->coherency_line_size > coherency_max_size)
+			coherency_max_size = this_leaf->coherency_line_size;
 	}
 
 	return 0;
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 70e19bc6cc9f..46b92cd61d0c 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -17,6 +17,8 @@ enum cache_type {
 	CACHE_TYPE_UNIFIED = BIT(2),
 };
 
+extern unsigned int coherency_max_size;
+
 /**
  * struct cacheinfo - represent a cache leaf node
  * @id: This cache's id. It is unique among caches with the same (type, level).
-- 
2.7.4


WARNING: multiple messages have this Message-ID (diff)
From: Shaokun Zhang <zhangshaokun@hisilicon.com>
To: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Will Deacon <will.deacon@arm.com>,
	Jeremy Linton <jeremy.linton@arm.com>,
	Shaokun Zhang <zhangshaokun@hisilicon.com>,
	Sudeep Holla <sudeep.holla@arm.com>
Subject: [PATCH v3 1/2] drivers: base: cacheinfo: Add variable to record max cache line size
Date: Mon, 27 May 2019 10:06:07 +0800	[thread overview]
Message-ID: <1558922768-29155-1-git-send-email-zhangshaokun@hisilicon.com> (raw)

Add coherency_max_size variable to record the maximum cache line size
for different cache levels. We will synchronize it with CTR_EL0.CWG
reporting in cache_line_size() for arm64.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
---
ChangeLog since v2:
  -- Rebase to 5.2-rc2
  -- Export cache_line_size for I/O driver
ChangeLog since v1:
  -- Move coherency_max_size to drivers/base/cacheinfo.c
  -- Address Catalin's comments
  Link: https://www.spinics.net/lists/arm-kernel/msg723615.html

 drivers/base/cacheinfo.c  | 5 +++++
 include/linux/cacheinfo.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index a7359535caf5..8827c60f51e2 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -213,6 +213,8 @@ int __weak cache_setup_acpi(unsigned int cpu)
 	return -ENOTSUPP;
 }
 
+unsigned int coherency_max_size;
+
 static int cache_shared_cpu_map_setup(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
@@ -251,6 +253,9 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
 				cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
 			}
 		}
+		/* record the maximum cache line size */
+		if (this_leaf->coherency_line_size > coherency_max_size)
+			coherency_max_size = this_leaf->coherency_line_size;
 	}
 
 	return 0;
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 70e19bc6cc9f..46b92cd61d0c 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -17,6 +17,8 @@ enum cache_type {
 	CACHE_TYPE_UNIFIED = BIT(2),
 };
 
+extern unsigned int coherency_max_size;
+
 /**
  * struct cacheinfo - represent a cache leaf node
  * @id: This cache's id. It is unique among caches with the same (type, level).
-- 
2.7.4


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             reply	other threads:[~2019-05-27  2:07 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-27  2:06 Shaokun Zhang [this message]
2019-05-27  2:06 ` [PATCH v3 1/2] drivers: base: cacheinfo: Add variable to record max cache line size Shaokun Zhang
2019-05-27  2:06 ` [PATCH v3 2/2] arm64: cacheinfo: Update cache_line_size detected from DT or PPTT Shaokun Zhang
2019-05-27  2:06   ` Shaokun Zhang
2019-05-27  6:08   ` Greg KH
2019-05-27  6:08     ` Greg KH
2019-05-27  7:14     ` Zhangshaokun
2019-05-27  7:14       ` Zhangshaokun
2019-05-27  6:06 ` [PATCH v3 1/2] drivers: base: cacheinfo: Add variable to record max cache line size Greg Kroah-Hartman
2019-05-27  6:06   ` Greg Kroah-Hartman

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