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Message-ID: <4FAC3D18.203@am.sony.com>
Date: Thu, 10 May 2012 15:11:36 -0700
From: Tim Bird <tim.bird@...sony.com>
To: Greg KH <gregkh@...uxfoundation.org>
CC: Brian Swetland <swetland@...gle.com>,
linux kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] staging: android: logger: Allocate logs dynamically at
boot (v3)
This changes the log initialization to be dynamic, but still
at boot time. These changes are a predecessor to implementing
runtime allocation and freeing of logs, to make the Android logger
less hard-coded.
Change from a fixed set of static log structures, to allocation
at init time into a list. Return proper error numbers on log
allocation failure.
Signed-off-by: Tim Bird <tim.bird@...sony.com>
---
drivers/staging/android/logger.c | 107 ++++++++++++++++++++++----------------
1 file changed, 62 insertions(+), 45 deletions(-)
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index ea69b6a..9ebcf42 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -25,6 +25,7 @@
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/time.h>
+#include <linux/vmalloc.h>
#include "logger.h"
#include <asm/ioctls.h>
@@ -45,8 +46,12 @@ struct logger_log {
size_t w_off; /* current write head offset */
size_t head; /* new readers start here */
size_t size; /* size of the log */
+ struct list_head logs; /* list of log channels (myself)*/
};
+static LIST_HEAD(log_list);
+
+
/*
* struct logger_reader - a logging device open for reading
*
@@ -408,7 +413,15 @@ ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov,
return ret;
}
-static struct logger_log *get_log_from_minor(int);
+static struct logger_log *get_log_from_minor(int minor)
+{
+ struct logger_log *log;
+
+ list_for_each_entry(log, &log_list, logs)
+ if (log->misc.minor == minor)
+ return log;
+ return NULL;
+}
/*
* logger_open - the log's open() file operation
@@ -565,80 +578,84 @@ static const struct file_operations logger_fops = {
};
/*
- * Defines a log structure with name 'NAME' and a size of 'SIZE' bytes, which
- * must be a power of two, greater than LOGGER_ENTRY_MAX_LEN, and less than
- * LONG_MAX minus LOGGER_ENTRY_MAX_LEN.
+ * Log size must be a power of two, greater than LOGGER_ENTRY_MAX_LEN,
+ * and less than LONG_MAX minus LOGGER_ENTRY_MAX_LEN.
*/
-#define DEFINE_LOGGER_DEVICE(VAR, NAME, SIZE) \
-static unsigned char _buf_ ## VAR[SIZE]; \
-static struct logger_log VAR = { \
- .buffer = _buf_ ## VAR, \
- .misc = { \
- .minor = MISC_DYNAMIC_MINOR, \
- .name = NAME, \
- .fops = &logger_fops, \
- .parent = NULL, \
- }, \
- .wq = __WAIT_QUEUE_HEAD_INITIALIZER(VAR .wq), \
- .readers = LIST_HEAD_INIT(VAR .readers), \
- .mutex = __MUTEX_INITIALIZER(VAR .mutex), \
- .w_off = 0, \
- .head = 0, \
- .size = SIZE, \
-};
+static int __init create_log(char *log_name, int size)
+{
+ int ret = 0;
+ struct logger_log *log;
+ unsigned char *buffer;
-DEFINE_LOGGER_DEVICE(log_main, LOGGER_LOG_MAIN, 256*1024)
-DEFINE_LOGGER_DEVICE(log_events, LOGGER_LOG_EVENTS, 256*1024)
-DEFINE_LOGGER_DEVICE(log_radio, LOGGER_LOG_RADIO, 256*1024)
-DEFINE_LOGGER_DEVICE(log_system, LOGGER_LOG_SYSTEM, 256*1024)
+ buffer = vmalloc(size);
+ if (buffer == NULL)
+ return -ENOMEM;
-static struct logger_log *get_log_from_minor(int minor)
-{
- if (log_main.misc.minor == minor)
- return &log_main;
- if (log_events.misc.minor == minor)
- return &log_events;
- if (log_radio.misc.minor == minor)
- return &log_radio;
- if (log_system.misc.minor == minor)
- return &log_system;
- return NULL;
-}
+ log = kzalloc(sizeof(struct logger_log), GFP_KERNEL);
+ if (log == NULL) {
+ ret = -ENOMEM;
+ goto out_free_buffer;
+ }
+ log->buffer = buffer;
-static int __init init_log(struct logger_log *log)
-{
- int ret;
+ log->misc.minor = MISC_DYNAMIC_MINOR;
+ log->misc.name = kstrdup(log_name, GFP_KERNEL);
+ if (log->misc.name == NULL) {
+ ret = -ENOMEM;
+ goto out_free_log;
+ }
+
+ log->misc.fops = &logger_fops;
+ log->misc.parent = NULL;
+ init_waitqueue_head(&log->wq);
+ INIT_LIST_HEAD(&log->readers);
+ mutex_init(&log->mutex);
+ log->w_off = 0;
+ log->head = 0;
+ log->size = size;
+
+ INIT_LIST_HEAD(&log->logs);
+ list_add_tail(&log->logs, &log_list);
+
+ /* finally, initialize the misc device for this log */
ret = misc_register(&log->misc);
if (unlikely(ret)) {
printk(KERN_ERR "logger: failed to register misc "
"device for log '%s'!\n", log->misc.name);
- return ret;
+ goto out_free_log;
}
printk(KERN_INFO "logger: created %luK log '%s'\n",
(unsigned long) log->size >> 10, log->misc.name);
return 0;
+
+out_free_log:
+ kfree(log);
+
+out_free_buffer:
+ vfree(buffer);
+ return ret;
}
static int __init logger_init(void)
{
int ret;
- ret = init_log(&log_main);
+ ret = create_log(LOGGER_LOG_MAIN, 256*1024);
if (unlikely(ret))
goto out;
- ret = init_log(&log_events);
+ ret = create_log(LOGGER_LOG_EVENTS, 256*1024);
if (unlikely(ret))
goto out;
- ret = init_log(&log_radio);
+ ret = create_log(LOGGER_LOG_RADIO, 256*1024);
if (unlikely(ret))
goto out;
- ret = init_log(&log_system);
+ ret = create_log(LOGGER_LOG_SYSTEM, 256*1024);
if (unlikely(ret))
goto out;
--
1.7.9.5
--
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