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From: Wyes Karny <wyes.karny@amd.com>
To: <rafael@kernel.org>, <ray.huang@amd.com>,
	<viresh.kumar@linaro.org>, <trenn@suse.com>, <shuah@kernel.org>
Cc: <gautham.shenoy@amd.com>, <Mario.Limonciello@amd.com>,
	<Perry.Yuan@amd.com>, <linux-pm@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, Wyes Karny <wyes.karny@amd.com>
Subject: [PATCH 3/6] cpupower: Add is_sysfs_present API
Date: Mon, 12 Jun 2023 11:36:12 +0000	[thread overview]
Message-ID: <20230612113615.205353-4-wyes.karny@amd.com> (raw)
In-Reply-To: <20230612113615.205353-1-wyes.karny@amd.com>

Add is_sysfs_present API to check whether the sysfs file is present or not.

Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
---
 tools/power/cpupower/lib/cpupower.c        | 7 +++++++
 tools/power/cpupower/lib/cpupower_intern.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c
index 3f7d0c0c5067..7a2ef691b20e 100644
--- a/tools/power/cpupower/lib/cpupower.c
+++ b/tools/power/cpupower/lib/cpupower.c
@@ -14,6 +14,13 @@
 #include "cpupower.h"
 #include "cpupower_intern.h"
 
+int is_valid_path(const char *path)
+{
+	if (access(path, F_OK) == -1)
+		return 0;
+	return 1;
+}
+
 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen)
 {
 	ssize_t numread;
diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h
index ac1112b956ec..5fdb8620d41b 100644
--- a/tools/power/cpupower/lib/cpupower_intern.h
+++ b/tools/power/cpupower/lib/cpupower_intern.h
@@ -7,5 +7,6 @@
 
 #define SYSFS_PATH_MAX 255
 
+int is_valid_path(const char *path);
 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen);
 unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen);
-- 
2.34.1


  parent reply	other threads:[~2023-06-12 11:44 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-12 11:36 [PATCH 0/6] cpupower: Add various feature control support for amd_pstate Wyes Karny
2023-06-12 11:36 ` [PATCH 1/6] amd-pstate: Make amd-pstate epp driver name hyphenated Wyes Karny
2023-06-15 17:31   ` Rafael J. Wysocki
2023-06-15 17:55     ` Wyes Karny
2023-06-15 18:30       ` Rafael J. Wysocki
2023-06-15 19:04         ` Wyes Karny
2023-06-16  7:29           ` Yuan, Perry
2023-06-16  7:07   ` Huang Rui
2023-06-16 12:33     ` Rafael J. Wysocki
2023-06-20 12:47       ` Huang Rui
2023-06-12 11:36 ` [PATCH 2/6] cpupower: Recognise amd-pstate active mode driver Wyes Karny
2023-06-12 11:36 ` Wyes Karny [this message]
2023-06-12 13:17   ` [PATCH v1.1 3/6] cpupower: Add is_valid_path API Wyes Karny
2023-06-12 11:36 ` [PATCH 4/6] cpupower: Add EPP value change support Wyes Karny
2023-06-16  7:22   ` Huang Rui
2023-06-16  9:03     ` Wyes Karny
2023-06-20 12:58       ` Huang Rui
2023-06-20 13:20         ` Wyes Karny
2023-06-20 13:49           ` Huang Rui
2023-06-12 11:36 ` [PATCH 5/6] cpupower: Add support for amd_pstate mode change Wyes Karny
2023-06-16  7:28   ` Huang Rui
2023-06-12 11:36 ` [PATCH 6/6] cpupower: Add turbo-boost support in cpupower Wyes Karny
2023-06-16  7:29   ` Huang Rui

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