linux-kernel - [PATCH V3 1/6] stm class: Add ioctl get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1454756672-12790-2-git-send-email-zhang.chunyan@linaro.org>
Date:	Sat,  6 Feb 2016 19:04:27 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	mathieu.poirier@...aro.org, alexander.shishkin@...ux.intel.com
Cc:	mike.leach@....com, Michael.Williams@....com, al.grant@....com,
	tor@...com, nicolas.guion@...com, broonie@...nel.org,
	robh@...nel.org, pratikp@...eaurora.org, corbet@....net,
	mark.rutland@....com, zhang.lyra@...il.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-api@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH V3 1/6] stm class: Add ioctl get_options interface

There is already an interface of set_options, but no get_options yet.
Before setting any options, one would may want to see the current
status of that option by means of get_options interface. This
interface has been used in CoreSight STM driver.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 drivers/hwtracing/stm/core.c | 12 ++++++++++++
 include/linux/stm.h          |  3 +++
 include/uapi/linux/stm.h     |  1 +
 3 files changed, 16 insertions(+)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index b6445d9..854a16d 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -571,6 +571,18 @@ stm_char_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 						    options);
 
 		break;
+
+	case STP_GET_OPTIONS:
+		if (stm_data->get_options)
+			err = stm_data->get_options(stm_data,
+						    stmf->output.master,
+						    stmf->output.channel,
+						    stmf->output.nr_chans,
+						    &options);
+
+		if (copy_to_user((void __user *)arg, &options, sizeof(u64)))
+			return -EFAULT;
+
 	default:
 		break;
 	}
diff --git a/include/linux/stm.h b/include/linux/stm.h
index 9d0083d..f351d62 100644
--- a/include/linux/stm.h
+++ b/include/linux/stm.h
@@ -88,6 +88,9 @@ struct stm_data {
 	long			(*set_options)(struct stm_data *, unsigned int,
 					       unsigned int, unsigned int,
 					       unsigned long);
+	long			(*get_options)(struct stm_data *, unsigned int,
+					       unsigned int, unsigned int,
+					       u64 *);
 };
 
 int stm_register_device(struct device *parent, struct stm_data *stm_data,
diff --git a/include/uapi/linux/stm.h b/include/uapi/linux/stm.h
index 626a8d3..0dab16e 100644
--- a/include/uapi/linux/stm.h
+++ b/include/uapi/linux/stm.h
@@ -46,5 +46,6 @@ struct stp_policy_id {
 #define STP_POLICY_ID_SET	_IOWR('%', 0, struct stp_policy_id)
 #define STP_POLICY_ID_GET	_IOR('%', 1, struct stp_policy_id)
 #define STP_SET_OPTIONS		_IOW('%', 2, __u64)
+#define STP_GET_OPTIONS		_IOR('%', 3, __u64)
 
 #endif /* _UAPI_LINUX_STM_H */
-- 
1.9.1