[patch] Add i8253 spinlocks where needed.

From: Vojtech Pavlik <vojtech@suse.cz>
To: torvalds@transmeta.com, linux-kernel@vger.kernel.org
Subject: [patch] Add i8253 spinlocks where needed.
Date: Sun, 26 May 2002 14:21:42 +0200	[thread overview]
Message-ID: <20020526142142.A17042@ucw.cz> (raw)

Hi!

ChangeSet@1.584, 2002-05-26 14:17:40+02:00, vojtech@twilight.ucw.cz
  This changeset hopefully fixes all the instances (at least on i386
  arch and arch-nonspecific drivers) where there the i8253 chip is
  accessed - to use a spinlock to serialize the multi-byte accesses.
  This should allow us to understand the timer problems that are
  happening now and then better.

ChangeSet@1.583, 2002-05-26 10:30:46+02:00, vojtech@twilight.ucw.cz
  This cset fixes timestamp generation in ftape-calibr.c, which was
  missing a lock for accessing the i8253 timer. This module running
  together with i386/kernel/time.c could result in the timer registers
  losing sync with software and reporting swapped values. There was
  an workaround for this in ftape-calibr.c, but could never completely
  fix the problem. Also, there still remains a race (now commented
  in ftape-calibr.c), with jiffies and the i8253 timer register. This
  cannot be fixed easily. Last, but not least, this converts ftape
  timestamps on x86_64 to use TSC timer solely, because it's always
  present there and doesn't have all the problems with the i8253 timer.
  
  Now there shouldn't be any code accessing the i8253 timer without
  a spinlock held. Finally!


 arch/i386/kernel/apm.c                     |   15 +---
 arch/i386/kernel/i8259.c                   |    4 +
 arch/i386/kernel/time.c                    |    4 +
 drivers/char/ftape/lowlevel/ftape-calibr.c |   97 +++++++++++++----------------
 drivers/char/vt.c                          |    3 
 drivers/ide/hd.c                           |   10 +-
 drivers/input/gameport/gameport.c          |   28 +++++++-
 7 files changed, 91 insertions(+), 70 deletions(-)


diff -Nru a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c

--- a/arch/i386/kernel/apm.c	Sun May 26 14:18:40 2002
+++ b/arch/i386/kernel/apm.c	Sun May 26 14:18:40 2002
@@ -1170,17 +1170,14 @@
 {
 #ifdef INIT_TIMER_AFTER_SUSPEND
 	unsigned long	flags;
+	extern spinlock_t i8253_lock;
 
-	save_flags(flags);
-	cli();
+	spin_lock_irqsave(&i8253_lock, flags);
 	/* set the clock to 100 Hz */
-	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
-	udelay(10);
-	outb_p(LATCH & 0xff , 0x40);	/* LSB */
-	udelay(10);
-	outb(LATCH >> 8 , 0x40);	/* MSB */
-	udelay(10);
-	restore_flags(flags);
+	outb_p(0x34, 0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
+	outb_p(LATCH & 0xff, 0x40);	/* LSB */
+	outb_p(LATCH >> 8, 0x40);	/* MSB */
+	spin_unlock_irqrestore(&i8253_lock, flags);
 #endif
 }
 
diff -Nru a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
--- a/arch/i386/kernel/i8259.c	Sun May 26 14:18:40 2002
+++ b/arch/i386/kernel/i8259.c	Sun May 26 14:18:40 2002
@@ -360,6 +360,8 @@
 void __init init_IRQ(void)
 {
 	int i;
+	extern spinlock_t i8253_lock;
+	unsigned long flags;
 
 #ifndef CONFIG_X86_VISWS_APIC
 	init_ISA_irqs();
@@ -415,9 +417,11 @@
 	 * Set the clock to HZ Hz, we already have a valid
 	 * vector now:
 	 */
+	spin_lock_irqsave(&i8253_lock, flags);
 	outb_p(0x34,0x43);		/* binary, mode 2, LSB/MSB, ch 0 */
 	outb_p(LATCH & 0xff , 0x40);	/* LSB */
 	outb(LATCH >> 8 , 0x40);	/* MSB */
+	spin_unlock_irqrestore(&i8253_lock, flags);
 
 #ifndef CONFIG_VISWS
 	setup_irq(2, &irq2);
diff -Nru a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
--- a/arch/i386/kernel/time.c	Sun May 26 14:18:40 2002
+++ b/arch/i386/kernel/time.c	Sun May 26 14:18:40 2002
@@ -574,6 +574,8 @@
 
 static unsigned long __init calibrate_tsc(void)
 {
+	unsigned long flags;
+
        /* Set the Gate high, disable speaker */
 	outb((inb(0x61) & ~0x02) | 0x01, 0x61);
 
@@ -584,9 +586,11 @@
 	 * (interrupt on terminal count mode), binary count,
 	 * load 5 * LATCH count, (LSB and MSB) to begin countdown.
 	 */
+	spin_lock_irqsave(&i8253_lock, flags);
 	outb(0xb0, 0x43);			/* binary, mode 0, LSB/MSB, Ch 2 */
 	outb(CALIBRATE_LATCH & 0xff, 0x42);	/* LSB of count */
 	outb(CALIBRATE_LATCH >> 8, 0x42);	/* MSB of count */
+	spin_unlock_irqrestore(&i8253_lock, flags);
 
 	{
 		unsigned long startlow, starthigh;
diff -Nru a/drivers/char/ftape/lowlevel/ftape-calibr.c b/drivers/char/ftape/lowlevel/ftape-calibr.c
--- a/drivers/char/ftape/lowlevel/ftape-calibr.c	Sun May 26 14:18:40 2002
+++ b/drivers/char/ftape/lowlevel/ftape-calibr.c	Sun May 26 14:18:40 2002
@@ -31,7 +31,10 @@
 #include <asm/io.h>
 #if defined(__alpha__)
 # include <asm/hwrpb.h>
-#elif defined(__i386__) || defined(__x86_64__)
+#elif defined(__x86_64__)
+# include <asm/msr.h>
+# include <asm/timex.h>
+#elif defined(__i386__) 
 # include <linux/timex.h>
 #endif
 #include <linux/ftape.h>
@@ -45,10 +48,14 @@
 # error Ftape is not implemented for this architecture!
 #endif
 
-#if defined(__alpha__)
+#if defined(__alpha__) || defined(__x86_64__)
 static unsigned long ps_per_cycle = 0;
 #endif
 
+#if defined(__i386__)
+extern spinlock_t i8253_lock;
+#endif
+
 /*
  * Note: On Intel PCs, the clock ticks at 100 Hz (HZ==100) which is
  * too slow for certain timeouts (and that clock doesn't even tick
@@ -67,48 +74,58 @@
 {
 #if defined(__alpha__)
 	unsigned long r;
-
 	asm volatile ("rpcc %0" : "=r" (r));
 	return r;
-#elif defined(__i386__) || defined(__x86_64__)
+#elif defined(__x86_64__)
+	unsigned long r;
+	rdtscl(r);
+	return r;
+#elif defined(__i386__)
+
+/*
+ * Note that there is some time between counter underflowing and jiffies
+ * increasing, so the code below won't always give correct output.
+ * -Vojtech
+ */
+
 	unsigned long flags;
 	__u16 lo;
 	__u16 hi;
 
-	save_flags(flags);
-	cli();
+	spin_lock_irqsave(&i8253_lock, flags); 
 	outb_p(0x00, 0x43);	/* latch the count ASAP */
 	lo = inb_p(0x40);	/* read the latched count */
 	lo |= inb(0x40) << 8;
 	hi = jiffies;
-	restore_flags(flags);
+	spin_unlock_irqrestore(&i8253_lock, flags); 
+
 	return ((hi + 1) * (unsigned int) LATCH) - lo;  /* downcounter ! */
 #endif
 }
 
 static unsigned int short_ftape_timestamp(void)
 {
-#if defined(__alpha__)
+#if defined(__alpha__) || defined(__x86_64__)
 	return ftape_timestamp();
-#elif defined(__i386__) || defined(__x86_64__)
+#elif defined(__i386__)
 	unsigned int count;
  	unsigned long flags;
- 
- 	save_flags(flags);
- 	cli();
+	
+	spin_lock_irqsave(&i8253_lock, flags); 
  	outb_p(0x00, 0x43);	/* latch the count ASAP */
 	count = inb_p(0x40);	/* read the latched count */
 	count |= inb(0x40) << 8;
- 	restore_flags(flags);
+	spin_unlock_irqrestore(&i8253_lock, flags); 
+
 	return (LATCH - count);	/* normal: downcounter */
 #endif
 }
 
 static unsigned int diff(unsigned int t0, unsigned int t1)
 {
-#if defined(__alpha__)
-	return (t1 <= t0) ? t1 + (1UL << 32) - t0 : t1 - t0;
-#elif defined(__i386__) || defined(__x86_64__)
+#if defined(__alpha__) || defined(__x86_64__)
+	return (t1 - t0);
+#elif defined(__i386__)
 	/*
 	 * This is tricky: to work for both short and full ftape_timestamps
 	 * we'll have to discriminate between these.
@@ -122,9 +139,9 @@
 
 static unsigned int usecs(unsigned int count)
 {
-#if defined(__alpha__)
+#if defined(__alpha__) || defined(__x86_64__)
 	return (ps_per_cycle * count) / 1000000UL;
-#elif defined(__i386__) || defined(__x86_64__)
+#elif defined(__i386__)
 	return (10000 * count) / ((CLOCK_TICK_RATE + 50) / 100);
 #endif
 }
@@ -153,49 +170,24 @@
 	save_flags(flags);
 	cli();
 	t0 = short_ftape_timestamp();
-	for (i = 0; i < 1000; ++i) {
+	for (i = 0; i < 1000; ++i)
 		status = inb(fdc.msr);
-	}
 	t1 = short_ftape_timestamp();
 	restore_flags(flags);
+
 	TRACE(ft_t_info, "inb() duration: %d nsec", ftape_timediff(t0, t1));
 	TRACE_EXIT;
 }
 
 static void init_clock(void)
 {
-#if defined(__i386__) || defined(__x86_64__)
-	unsigned int t;
-	int i;
 	TRACE_FUN(ft_t_any);
 
-	/*  Haven't studied on why, but there sometimes is a problem
-	 *  with the tick timer readout. The two bytes get swapped.
-	 *  This hack solves that problem by doing one extra input.
-	 */
-	for (i = 0; i < 1000; ++i) {
-		t = short_ftape_timestamp();
-		if (t > LATCH) {
-			inb_p(0x40);	/* get in sync again */
-			TRACE(ft_t_warn, "clock counter fixed");
-			break;
-		}
-	}
+#if defined(__x86_64__)
+	ps_per_cycle = 1000000000UL / cpu_khz;
 #elif defined(__alpha__)
-#if CONFIG_FT_ALPHA_CLOCK == 0
-#error You must define and set CONFIG_FT_ALPHA_CLOCK in 'make config' !
-#endif
 	extern struct hwrpb_struct *hwrpb;
-	TRACE_FUN(ft_t_any);
-
-	if (hwrpb->cycle_freq != 0) {
-		ps_per_cycle = (1000*1000*1000*1000UL) / hwrpb->cycle_freq;
-	} else {
-		/*
-		 * HELP:  Linux 2.0.x doesn't set cycle_freq on my noname !
-		 */
-		ps_per_cycle = (1000*1000*1000*1000UL) / CONFIG_FT_ALPHA_CLOCK;
-	}
+	ps_per_cycle = (1000*1000*1000*1000UL) / hwrpb->cycle_freq;
 #endif
 	TRACE_EXIT;
 }
@@ -214,7 +206,7 @@
 	unsigned int tc = 0;
 	unsigned int count;
 	unsigned int time;
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__)
 	unsigned int old_tc = 0;
 	unsigned int old_count = 1;
 	unsigned int old_time = 1;
@@ -257,15 +249,14 @@
 		tc = (1000 * time) / (count - 1);
 		TRACE(ft_t_any, "once:%3d us,%6d times:%6d us, TC:%5d ns",
 			usecs(once), count - 1, usecs(multiple), tc);
-#if defined(__alpha__)
+#if defined(__alpha__) || defined(__x86_64__)
 		/*
 		 * Increase the calibration count exponentially until the
 		 * calibration time exceeds 100 ms.
 		 */
-		if (time >= 100*1000) {
+		if (time >= 100*1000)
 			break;
-		}
-#elif defined(__i386__) || defined(__x86_64__)
+#elif defined(__i386__)
 		/*
 		 * increase the count until the resulting time nears 2/HZ,
 		 * then the tc will drop sharply because we lose LATCH counts.
diff -Nru a/drivers/char/vt.c b/drivers/char/vt.c
--- a/drivers/char/vt.c	Sun May 26 14:18:40 2002
+++ b/drivers/char/vt.c	Sun May 26 14:18:40 2002
@@ -107,6 +107,7 @@
 _kd_mksound(unsigned int hz, unsigned int ticks)
 {
 	static struct timer_list sound_timer = { function: kd_nosound };
+        extern spinlock_t i8253_lock;
 	unsigned int count = 0;
 	unsigned long flags;
 
@@ -120,10 +121,12 @@
 		/* enable counter 2 */
 		outb_p(inb_p(0x61)|3, 0x61);
 		/* set command for counter 2, 2 byte write */
+        	spin_lock(&i8253_lock);
 		outb_p(0xB6, 0x43);
 		/* select desired HZ */
 		outb_p(count & 0xff, 0x42);
 		outb((count >> 8) & 0xff, 0x42);
+        	spin_unlock(&i8253_lock);
 
 		if (ticks) {
 			sound_timer.expires = jiffies+ticks;
diff -Nru a/drivers/ide/hd.c b/drivers/ide/hd.c
--- a/drivers/ide/hd.c	Sun May 26 14:18:40 2002
+++ b/drivers/ide/hd.c	Sun May 26 14:18:40 2002
@@ -110,6 +110,8 @@
 
 static struct timer_list device_timer;
 
+#define TIMEOUT_VALUE	(6*HZ)
+
 #define SET_TIMER 							\
 	do {								\
 		mod_timer(&device_timer, jiffies + TIMEOUT_VALUE);	\
@@ -131,16 +133,16 @@
 
 unsigned long read_timer(void)
 {
+        extern spinlock_t i8253_lock;
 	unsigned long t, flags;
 	int i;
 
-	save_flags(flags);
-	cli();
+	spin_lock_irqsave(&i8253_lock, flags);
 	t = jiffies * 11932;
     	outb_p(0, 0x43);
 	i = inb_p(0x40);
 	i |= inb(0x40) << 8;
-	restore_flags(flags);
+	spin_unlock_irqrestore(&i8253_lock, flags);
 	return(t - i);
 }
 #endif
@@ -831,7 +833,7 @@
 		printk("hd: unable to get major %d for hard disk\n",MAJOR_NR);
 		return -1;
 	}
-	blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST, &hd_lock);
+	blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), do_hd_request, &hd_lock);
 	blk_queue_max_sectors(BLK_DEFAULT_QUEUE(MAJOR_NR), 255);
 	add_gendisk(&hd_gendisk);
 	init_timer(&device_timer);
diff -Nru a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
--- a/drivers/input/gameport/gameport.c	Sun May 26 14:18:40 2002
+++ b/drivers/input/gameport/gameport.c	Sun May 26 14:18:40 2002
@@ -54,16 +54,36 @@
 static struct gameport *gameport_list;
 static struct gameport_dev *gameport_dev;
 
+
+#ifdef __i386__
+
+#define DELTA(x,y)      ((y)-(x)+((y)<(x)?1193180/HZ:0))
+#define GET_TIME(x)     do { x = get_time_pit(); } while (0)
+
+static unsigned int get_time_pit(void)
+{
+	extern spinlock_t i8253_lock;
+	unsigned long flags;
+	unsigned int count;
+
+	spin_lock_irqsave(&i8253_lock, flags);
+	outb_p(0x00, 0x43);
+	count = inb_p(0x40);
+	count |= inb_p(0x40) << 8;
+	spin_unlock_irqrestore(&i8253_lock, flags);
+
+	return count;
+}
+
+#endif
+
 /*
  * gameport_measure_speed() measures the gameport i/o speed.
  */
 
 static int gameport_measure_speed(struct gameport *gameport)
 {
-#if defined(__i386__) || defined(__x86_64__)
-
-#define GET_TIME(x)     do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)
-#define DELTA(x,y)      ((y)-(x)+((y)<(x)?1193180L/HZ:0))
+#ifdef __i386__
 
 	unsigned int i, t, t1, t2, t3, tx;
 	unsigned long flags;

===================================================================


This BitKeeper patch contains the following changesets:
1.582..1.584
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3FK[V>!@X^#KL_P!<D_!-'2P`````
`
end

-- 
Vojtech Pavlik
SuSE Labs
