---

yaml
---
r: 96460
b: refs/heads/master
c: 5d33e4d
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 60a2988aea701a6424809a5432bf068667aac177
+refs/heads/master: 5d33e4d7fd9a52d2673e5c730eab81856e100a74

trunk/arch/um/drivers/random.c

@@ -8,16 +8,18 @@
 #include <linux/sched.h>
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/interrupt.h>
 #include <linux/miscdevice.h>
 #include <linux/delay.h>
 #include <asm/uaccess.h>
+#include "irq_kern.h"
 #include "os.h"
 
 /*
  * core module and version information
  */
 #define RNG_VERSION "1.0.0"
-#define RNG_MODULE_NAME "random"
+#define RNG_MODULE_NAME "hw_random"
 
 #define RNG_MISCDEV_MINOR		183 /* official */
 
@@ -26,6 +28,7 @@
  * protects against a module being loaded twice at the same time.
  */
 static int random_fd = -1;
+static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
 
 static int rng_dev_open (struct inode *inode, struct file *filp)
 {
@@ -38,6 +41,8 @@ static int rng_dev_open (struct inode *inode, struct file *filp)
 	return 0;
 }
 
+static atomic_t host_sleep_count = ATOMIC_INIT(0);
+
 static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
                              loff_t * offp)
 {
@@ -60,11 +65,26 @@ static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
                         }
                 }
                 else if(n == -EAGAIN){
+			DECLARE_WAITQUEUE(wait, current);
+
                         if (filp->f_flags & O_NONBLOCK)
                                 return ret ? : -EAGAIN;
 
-                        if(need_resched())
-                                schedule_timeout_interruptible(1);
+			atomic_inc(&host_sleep_count);
+			reactivate_fd(random_fd, RANDOM_IRQ);
+			add_sigio_fd(random_fd);
+
+			add_wait_queue(&host_read_wait, &wait);
+			set_task_state(current, TASK_INTERRUPTIBLE);
+
+			schedule();
+			set_task_state(current, TASK_RUNNING);
+			remove_wait_queue(&host_read_wait, &wait);
+
+			if (atomic_dec_and_test(&host_sleep_count)) {
+				ignore_sigio_fd(random_fd);
+				deactivate_fd(random_fd, RANDOM_IRQ);
+			}
                 }
                 else return n;
 		if (signal_pending (current))
@@ -86,6 +106,13 @@ static struct miscdevice rng_miscdev = {
 	&rng_chrdev_ops,
 };
 
+static irqreturn_t random_interrupt(int irq, void *data)
+{
+	wake_up(&host_read_wait);
+
+	return IRQ_HANDLED;
+}
+
 /*
  * rng_init - initialize RNG module
  */
@@ -99,10 +126,14 @@ static int __init rng_init (void)
 
         random_fd = err;
 
-        err = os_set_fd_block(random_fd, 0);
+	err = um_request_irq(RANDOM_IRQ, random_fd, IRQ_READ, random_interrupt,
+			     IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "random",
+			     NULL);
         if(err)
 		goto err_out_cleanup_hw;
 
+	sigio_broken(random_fd, 1);
+
 	err = misc_register (&rng_miscdev);
 	if (err) {
 		printk (KERN_ERR RNG_MODULE_NAME ": misc device register failed\n");
@@ -113,6 +144,7 @@ static int __init rng_init (void)
         return err;
 
  err_out_cleanup_hw:
+	os_close_file(random_fd);
         random_fd = -1;
         goto out;
 }
@@ -122,6 +154,7 @@ static int __init rng_init (void)
  */
 static void __exit rng_cleanup (void)
 {
+	os_close_file(random_fd);
 	misc_deregister (&rng_miscdev);
 }
 

trunk/arch/um/include/os.h

@@ -290,6 +290,7 @@ extern void os_set_ioignore(void);
 extern int add_sigio_fd(int fd);
 extern int ignore_sigio_fd(int fd);
 extern void maybe_sigio_broken(int fd, int read);
+extern void sigio_broken(int fd, int read);
 
 /* sys-x86_64/prctl.c */
 extern int os_arch_prctl(int pid, int code, unsigned long *addr);

trunk/arch/um/include/process.h

@@ -1,5 +1,5 @@
 /* 
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
@@ -8,18 +8,10 @@
 
 #include <signal.h>
 
+/* Copied from linux/compiler-gcc.h since we can't include it directly */
+#define barrier() __asm__ __volatile__("": : :"memory")
+
 extern void sig_handler(int sig, struct sigcontext sc);
 extern void alarm_handler(int sig, struct sigcontext sc);
 
 #endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */

trunk/arch/um/os-Linux/sigio.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2002 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
@@ -15,6 +15,7 @@
 #include "kern_util.h"
 #include "init.h"
 #include "os.h"
+#include "process.h"
 #include "sigio.h"
 #include "um_malloc.h"
 #include "user.h"
@@ -338,20 +339,10 @@ static void write_sigio_workaround(void)
 	close(l_write_sigio_fds[1]);
 }
 
-/* Changed during early boot */
-static int pty_output_sigio = 0;
-static int pty_close_sigio = 0;
-
-void maybe_sigio_broken(int fd, int read)
+void sigio_broken(int fd, int read)
 {
 	int err;
 
-	if (!isatty(fd))
-		return;
-
-	if ((read || pty_output_sigio) && (!read || pty_close_sigio))
-		return;
-
 	write_sigio_workaround();
 
 	sigio_lock();
@@ -370,6 +361,21 @@ void maybe_sigio_broken(int fd, int read)
 	sigio_unlock();
 }
 
+/* Changed during early boot */
+static int pty_output_sigio;
+static int pty_close_sigio;
+
+void maybe_sigio_broken(int fd, int read)
+{
+	if (!isatty(fd))
+		return;
+
+	if ((read || pty_output_sigio) && (!read || pty_close_sigio))
+		return;
+
+	sigio_broken(fd, read);
+}
+
 static void sigio_cleanup(void)
 {
 	if (write_sigio_pid == -1)
@@ -383,7 +389,7 @@ static void sigio_cleanup(void)
 __uml_exitcall(sigio_cleanup);
 
 /* Used as a flag during SIGIO testing early in boot */
-static volatile int got_sigio = 0;
+static int got_sigio;
 
 static void __init handler(int sig)
 {
@@ -498,7 +504,8 @@ static void tty_output(int master, int slave)
 	if (errno != EAGAIN)
 		printk(UM_KERN_ERR "tty_output : write failed, errno = %d\n",
 		       errno);
-	while (((n = read(slave, buf, sizeof(buf))) > 0) && !got_sigio)
+	while (((n = read(slave, buf, sizeof(buf))) > 0) &&
+	       !({ barrier(); got_sigio; }))
 		;
 
 	if (got_sigio) {

trunk/include/asm-um/irq.h

@@ -15,8 +15,9 @@
 #define SIGIO_WRITE_IRQ 	11
 #define TELNETD_IRQ 		12
 #define XTERM_IRQ 		13
+#define RANDOM_IRQ 		14
 
-#define LAST_IRQ XTERM_IRQ
+#define LAST_IRQ RANDOM_IRQ
 #define NR_IRQS (LAST_IRQ + 1)
 
 #endif