diff options
| author | Xabier Marquiegui <reibax@gmail.com> | 2023-10-12 00:39:53 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-02-06 16:40:02 +0100 |
| commit | 63cb05f600940a3b4824509e7e0e909f040c82ee (patch) | |
| tree | a3bb7fce3852a8b410a79bd526697fcb91ab0142 /include | |
| parent | ed97d37c271ac6064638a3ccb4211799af8a4d8b (diff) | |
posix-clock: introduce posix_clock_context concept
[ Upstream commit 60c6946675fc06dd2fd2b7a4b6fd1c1f046f1056 ]
Add the necessary structure to support custom private-data per
posix-clock user.
The previous implementation of posix-clock assumed all file open
instances need access to the same clock structure on private_data.
The need for individual data structures per file open instance has been
identified when developing support for multiple timestamp event queue
users for ptp_clock.
Signed-off-by: Xabier Marquiegui <reibax@gmail.com>
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: e859d375d169 ("posix-clock: Store file pointer in struct posix_clock_context")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/posix-clock.h | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/include/linux/posix-clock.h b/include/linux/posix-clock.h index 468328b1e1dd..ef8619f48920 100644 --- a/include/linux/posix-clock.h +++ b/include/linux/posix-clock.h @@ -14,6 +14,7 @@ #include <linux/rwsem.h> struct posix_clock; +struct posix_clock_context; /** * struct posix_clock_operations - functional interface to the clock @@ -50,18 +51,18 @@ struct posix_clock_operations { /* * Optional character device methods: */ - long (*ioctl) (struct posix_clock *pc, - unsigned int cmd, unsigned long arg); + long (*ioctl)(struct posix_clock_context *pccontext, unsigned int cmd, + unsigned long arg); - int (*open) (struct posix_clock *pc, fmode_t f_mode); + int (*open)(struct posix_clock_context *pccontext, fmode_t f_mode); - __poll_t (*poll) (struct posix_clock *pc, - struct file *file, poll_table *wait); + __poll_t (*poll)(struct posix_clock_context *pccontext, struct file *file, + poll_table *wait); - int (*release) (struct posix_clock *pc); + int (*release)(struct posix_clock_context *pccontext); - ssize_t (*read) (struct posix_clock *pc, - uint flags, char __user *buf, size_t cnt); + ssize_t (*read)(struct posix_clock_context *pccontext, uint flags, + char __user *buf, size_t cnt); }; /** @@ -91,6 +92,24 @@ struct posix_clock { }; /** + * struct posix_clock_context - represents clock file operations context + * + * @clk: Pointer to the clock + * @private_clkdata: Pointer to user data + * + * Drivers should use struct posix_clock_context during specific character + * device file operation methods to access the posix clock. + * + * Drivers can store a private data structure during the open operation + * if they have specific information that is required in other file + * operations. + */ +struct posix_clock_context { + struct posix_clock *clk; + void *private_clkdata; +}; + +/** * posix_clock_register() - register a new clock * @clk: Pointer to the clock. Caller must provide 'ops' field * @dev: Pointer to the initialized device. Caller must provide |