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[Linux-ATM-General] [atmdrvr zatm] Remove obsolete EXACT_TS support
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From: Mitchell B. Jr <mi...@sf...> - 2003-07-28 07:08:15
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Chas - here's another 2.6 atm driver patch. Please push it upstream.
This removes the obsolete "exact timestamp" support from the zatm driver.
My understanding is that it was part of a research thing Werner did 8 or
so years ago. It has no purpose for any production use. I think 2.6 is
its time to die.
Besides, these days we use do_gettimeofday() instead of xtime so we should
have a reasonably accurate timestamp anyways.
The only program that uses the ZATM_GETTHIST ioctl is the src/debug/znth.c
from the userland distribution. This isn't even compiled as part of the
make process so I don't feel any guilt about breaking it. It should
probably also just go away.
I don't have the hardware (and really doubt anyone else does either, but
that's another matter entirely) but it still compiles and insmod's.
Patch is versus 2.6.0-test2.
-Mitch
diff -urN -X dontdiff linux-2.6.0-test2-VIRGIN/drivers/atm/Kconfig linux-2.6.0-test2mnb1/drivers/atm/Kconfig
--- linux-2.6.0-test2-VIRGIN/drivers/atm/Kconfig 2003-07-13 20:33:47.000000000 -0700
+++ linux-2.6.0-test2mnb1/drivers/atm/Kconfig 2003-07-27 13:02:32.000000000 -0700
@@ -164,18 +164,6 @@
Note that extended debugging may create certain race conditions
itself. Enable this ONLY if you suspect problems with the driver.
-config ATM_ZATM_EXACT_TS
- bool "Enable usec resolution timestamps"
- depends on ATM_ZATM && X86
- help
- The uPD98401 SAR chip supports a high-resolution timer (approx. 30
- MHz) that is used for very accurate reception timestamps. Because
- that timer overflows after 140 seconds, and also to avoid timer
- drift, time measurements need to be periodically synchronized with
- the normal system time. Enabling this feature will add some general
- overhead for timer synchronization and also per-packet overhead for
- time conversion.
-
# bool 'Rolfs TI TNETA1570' CONFIG_ATM_TNETA1570 y
# if [ "$CONFIG_ATM_TNETA1570" = "y" ]; then
# bool ' Enable extended debugging' CONFIG_ATM_TNETA1570_DEBUG n
diff -urN -X dontdiff linux-2.6.0-test2-VIRGIN/drivers/atm/zatm.c linux-2.6.0-test2mnb1/drivers/atm/zatm.c
--- linux-2.6.0-test2-VIRGIN/drivers/atm/zatm.c 2003-07-13 20:31:56.000000000 -0700
+++ linux-2.6.0-test2mnb1/drivers/atm/zatm.c 2003-07-27 13:02:32.000000000 -0700
@@ -52,13 +52,6 @@
#define DPRINTK(format,args...)
#endif
-#ifndef __i386__
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
-#warning Precise timestamping only available on i386 platform
-#undef CONFIG_ATM_ZATM_EXACT_TS
-#endif
-#endif
-
#ifndef CONFIG_ATM_ZATM_DEBUG
@@ -347,150 +340,6 @@
restore_flags(flags);
}
-
-/*----------------------- high-precision timestamps -------------------------*/
-
-
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
-
-static struct timer_list sync_timer;
-
-
-/*
- * Note: the exact time is not normalized, i.e. tv_usec can be > 1000000.
- * This must be handled by higher layers.
- */
-
-static inline struct timeval exact_time(struct zatm_dev *zatm_dev,u32 ticks)
-{
- struct timeval tmp;
-
- tmp = zatm_dev->last_time;
- tmp.tv_usec += ((s64) (ticks-zatm_dev->last_clk)*
- (s64) zatm_dev->factor) >> TIMER_SHIFT;
- return tmp;
-}
-
-
-static void zatm_clock_sync(unsigned long dummy)
-{
- struct atm_dev *atm_dev;
- struct zatm_dev *zatm_dev;
-
- for (atm_dev = zatm_boards; atm_dev; atm_dev = zatm_dev->more) {
- unsigned long flags,interval;
- int diff;
- struct timeval now,expected;
- u32 ticks;
-
- zatm_dev = ZATM_DEV(atm_dev);
- save_flags(flags);
- cli();
- ticks = zpeekl(zatm_dev,uPD98401_TSR);
- do_gettimeofday(&now);
- restore_flags(flags);
- expected = exact_time(zatm_dev,ticks);
- diff = 1000000*(expected.tv_sec-now.tv_sec)+
- (expected.tv_usec-now.tv_usec);
- zatm_dev->timer_history[zatm_dev->th_curr].real = now;
- zatm_dev->timer_history[zatm_dev->th_curr].expected = expected;
- zatm_dev->th_curr = (zatm_dev->th_curr+1) &
- (ZATM_TIMER_HISTORY_SIZE-1);
- interval = 1000000*(now.tv_sec-zatm_dev->last_real_time.tv_sec)
- +(now.tv_usec-zatm_dev->last_real_time.tv_usec);
- if (diff >= -ADJ_REP_THRES && diff <= ADJ_REP_THRES)
- zatm_dev->timer_diffs = 0;
- else
-#ifndef AGGRESSIVE_DEBUGGING
- if (++zatm_dev->timer_diffs >= ADJ_MSG_THRES)
-#endif
- {
- zatm_dev->timer_diffs = 0;
- printk(KERN_INFO DEV_LABEL ": TSR update after %ld us:"
- " calculation differed by %d us\n",interval,diff);
-#ifdef AGGRESSIVE_DEBUGGING
- printk(KERN_DEBUG " %d.%08d -> %d.%08d (%lu)\n",
- zatm_dev->last_real_time.tv_sec,
- zatm_dev->last_real_time.tv_usec,
- now.tv_sec,now.tv_usec,interval);
- printk(KERN_DEBUG " %u -> %u (%d)\n",
- zatm_dev->last_clk,ticks,ticks-zatm_dev->last_clk);
- printk(KERN_DEBUG " factor %u\n",zatm_dev->factor);
-#endif
- }
- if (diff < -ADJ_IGN_THRES || diff > ADJ_IGN_THRES) {
- /* filter out any major changes (e.g. time zone setup and
- such) */
- zatm_dev->last_time = now;
- zatm_dev->factor =
- (1000 << TIMER_SHIFT)/(zatm_dev->khz+1);
- }
- else {
- zatm_dev->last_time = expected;
- /*
- * Is the accuracy of udelay really only about 1:300 on
- * a 90 MHz Pentium ? Well, the following line avoids
- * the problem, but ...
- *
- * What it does is simply:
- *
- * zatm_dev->factor = (interval << TIMER_SHIFT)/
- * (ticks-zatm_dev->last_clk);
- */
-#define S(x) #x /* "stringification" ... */
-#define SX(x) S(x)
- asm("movl %2,%%ebx\n\t"
- "subl %3,%%ebx\n\t"
- "xorl %%edx,%%edx\n\t"
- "shldl $" SX(TIMER_SHIFT) ",%1,%%edx\n\t"
- "shl $" SX(TIMER_SHIFT) ",%1\n\t"
- "divl %%ebx\n\t"
- : "=a" (zatm_dev->factor)
- : "0" (interval-diff),"g" (ticks),
- "g" (zatm_dev->last_clk)
- : "ebx","edx","cc");
-#undef S
-#undef SX
-#ifdef AGGRESSIVE_DEBUGGING
- printk(KERN_DEBUG " (%ld << %d)/(%u-%u) = %u\n",
- interval,TIMER_SHIFT,ticks,zatm_dev->last_clk,
- zatm_dev->factor);
-#endif
- }
- zatm_dev->last_real_time = now;
- zatm_dev->last_clk = ticks;
- }
- mod_timer(&sync_timer,sync_timer.expires+POLL_INTERVAL*HZ);
-}
-
-
-static void __init zatm_clock_init(struct zatm_dev *zatm_dev)
-{
- static int start_timer = 1;
- unsigned long flags;
-
- zatm_dev->factor = (1000 << TIMER_SHIFT)/(zatm_dev->khz+1);
- zatm_dev->timer_diffs = 0;
- memset(zatm_dev->timer_history,0,sizeof(zatm_dev->timer_history));
- zatm_dev->th_curr = 0;
- save_flags(flags);
- cli();
- do_gettimeofday(&zatm_dev->last_time);
- zatm_dev->last_clk = zpeekl(zatm_dev,uPD98401_TSR);
- if (start_timer) {
- start_timer = 0;
- init_timer(&sync_timer);
- sync_timer.expires = jiffies+POLL_INTERVAL*HZ;
- sync_timer.function = zatm_clock_sync;
- add_timer(&sync_timer);
- }
- restore_flags(flags);
-}
-
-
-#endif
-
-
/*----------------------------------- RX ------------------------------------*/
@@ -581,11 +430,7 @@
EVENT("error code 0x%x/0x%x\n",(here[3] & uPD98401_AAL5_ES) >>
uPD98401_AAL5_ES_SHIFT,error);
skb = ((struct rx_buffer_head *) bus_to_virt(here[2]))->skb;
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
- skb->stamp = exact_time(zatm_dev,here[1]);
-#else
do_gettimeofday(&skb->stamp);
-#endif
#if 0
printk("[-3..0] 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n",((unsigned *) skb->data)[-3],
((unsigned *) skb->data)[-2],((unsigned *) skb->data)[-1],
@@ -1455,9 +1300,6 @@
"MHz\n",dev->number,
(zin(VER) & uPD98401_MAJOR) >> uPD98401_MAJOR_SHIFT,
zin(VER) & uPD98401_MINOR,zatm_dev->khz/1000,zatm_dev->khz % 1000);
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
- zatm_clock_init(zatm_dev);
-#endif
return uPD98402_init(dev);
}
@@ -1699,22 +1541,6 @@
restore_flags(flags);
return 0;
}
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
- case ZATM_GETTHIST:
- {
- int i;
- struct zatm_t_hist hs[ZATM_TIMER_HISTORY_SIZE];
- save_flags(flags);
- cli();
- for (i = 0; i < ZATM_TIMER_HISTORY_SIZE; i++)
- hs[i] = zatm_dev->timer_history[
- (zatm_dev->th_curr+i) &
- (ZATM_TIMER_HISTORY_SIZE-1)];
- restore_flags(flags);
- return copy_to_user((struct zatm_t_hist *) arg,
- hs, sizeof(hs)) ? -EFAULT : 0;
- }
-#endif
default:
if (!dev->phy->ioctl) return -ENOIOCTLCMD;
return dev->phy->ioctl(dev,cmd,arg);
diff -urN -X dontdiff linux-2.6.0-test2-VIRGIN/drivers/atm/zatm.h linux-2.6.0-test2mnb1/drivers/atm/zatm.h
--- linux-2.6.0-test2-VIRGIN/drivers/atm/zatm.h 2003-07-13 20:34:40.000000000 -0700
+++ linux-2.6.0-test2mnb1/drivers/atm/zatm.h 2003-07-27 13:02:32.000000000 -0700
@@ -40,31 +40,6 @@
#define MBX_TX_0 2
#define MBX_TX_1 3
-
-/*
- * mkdep doesn't spot this dependency, but that's okay, because zatm.c uses
- * CONFIG_ATM_ZATM_EXACT_TS too.
- */
-
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
-#define POLL_INTERVAL 60 /* TSR poll interval in seconds; must be <=
- (2^31-1)/clock */
-#define TIMER_SHIFT 20 /* scale factor for fixed-point arithmetic;
- 1 << TIMER_SHIFT must be
- (1) <= (2^64-1)/(POLL_INTERVAL*clock),
- (2) >> clock/10^6, and
- (3) <= (2^32-1)/1000 */
-#define ADJ_IGN_THRES 1000000 /* don't adjust if we're off by more than that
- many usecs - this filters clock corrections,
- time zone changes, etc. */
-#define ADJ_REP_THRES 20000 /* report only differences of more than that
- many usecs (don't mention single lost timer
- ticks; 10 msec is only 0.03% anyway) */
-#define ADJ_MSG_THRES 5 /* issue complaints only if getting that many
- significant timer differences in a row */
-#endif
-
-
struct zatm_vcc {
/*-------------------------------- RX part */
int rx_chan; /* RX channel, 0 if none */
@@ -103,17 +78,6 @@
u32 pool_base; /* Free buffer pool dsc (word addr) */
/*-------------------------------- ZATM links */
struct atm_dev *more; /* other ZATM devices */
-#ifdef CONFIG_ATM_ZATM_EXACT_TS
- /*-------------------------------- timestamp calculation */
- u32 last_clk; /* results of last poll: clock, */
- struct timeval last_time; /* virtual time and */
- struct timeval last_real_time; /* real time */
- u32 factor; /* multiplication factor */
- int timer_diffs; /* number of significant deviations */
- struct zatm_t_hist timer_history[ZATM_TIMER_HISTORY_SIZE];
- /* record of timer synchronizations */
- int th_curr; /* current position */
-#endif
/*-------------------------------- general information */
int mem; /* RAM on board (in bytes) */
int khz; /* timer clock */
diff -urN -X dontdiff linux-2.6.0-test2-VIRGIN/include/linux/atm_zatm.h linux-2.6.0-test2mnb1/include/linux/atm_zatm.h
--- linux-2.6.0-test2-VIRGIN/include/linux/atm_zatm.h 2003-07-13 20:36:33.000000000 -0700
+++ linux-2.6.0-test2mnb1/include/linux/atm_zatm.h 2003-07-27 14:35:34.000000000 -0700
@@ -21,9 +21,6 @@
/* get statistics and zero */
#define ZATM_SETPOOL _IOW('a',ATMIOC_SARPRV+3,struct atmif_sioc)
/* set pool parameters */
-#define ZATM_GETTHIST _IOW('a',ATMIOC_SARPRV+4,struct atmif_sioc)
- /* get a history of timer
- differences */
struct zatm_pool_info {
int ref_count; /* free buffer pool usage counters */
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