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On certain chipsets AT keyboard controller isn't present and is

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emulated by BIOS using SMI interrupt. On those chipsets reading
from the status port may be thousand times slower than usually.
Sometimes this emilation is not working properly resulting in
commands timing out and since we assume that inb() operation
takes very little time to complete we need to adjust number of
retries to keep waiting time within a designed limits (100ms).
Measure time it takes to make read_status() call and adjust
number of retries accordingly.

To keep it simple, use TSC to measure inb() performance and
keep it to amd64-only, since TSC may not available on older
CPUs.

Also enable detection of the AT controller absence on amd64.

Reviewed by:	jhb
MFC after:	1 month
This commit is contained in:
Maxim Sobolev 2010-04-29 06:16:00 +00:00
parent 8583f92fdf
commit ff605594dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=207354
4 changed files with 69 additions and 16 deletions
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76
sys/dev/atkbdc/atkbdc.c
View File

@ -44,6 +44,10 @@ __FBSDID("$FreeBSD$");
#include <machine/resource.h>
#include <sys/rman.h>
#if defined(__amd64__)
#include <machine/clock.h>
#endif
#include <dev/atkbdc/atkbdcreg.h>
#ifdef __sparc64__
@ -153,7 +157,7 @@ atkbdc_configure(void)
bus_space_tag_t tag;
bus_space_handle_t h0;
bus_space_handle_t h1;
#if defined(__i386__)
#if defined(__i386__) || defined(__amd64__)
volatile int i;
register_t flags;
#endif
@ -222,7 +226,7 @@ atkbdc_configure(void)
#endif
#endif
#if defined(__i386__)
#if defined(__i386__) || defined(__amd64__)
/*
* Check if we really have AT keyboard controller. Poll status
* register until we get "all clear" indication. If no such
@ -248,6 +252,11 @@ static int
atkbdc_setup(atkbdc_softc_t *sc, bus_space_tag_t tag, bus_space_handle_t h0,
bus_space_handle_t h1)
{
#if defined(__amd64__)
u_int64_t tscval[3], read_delay;
register_t flags;
#endif
if (sc->ioh0 == 0) { /* XXX */
sc->command_byte = -1;
sc->command_mask = 0;
@ -264,6 +273,33 @@ atkbdc_setup(atkbdc_softc_t *sc, bus_space_tag_t tag, bus_space_handle_t h0,
sc->iot = tag;
sc->ioh0 = h0;
sc->ioh1 = h1;
#if defined(__amd64__)
/*
* On certain chipsets AT keyboard controller isn't present and is
* emulated by BIOS using SMI interrupt. On those chipsets reading
* from the status port may be thousand times slower than usually.
* Sometimes this emilation is not working properly resulting in
* commands timing our and since we assume that inb() operation
* takes very little time to complete we need to adjust number of
* retries to keep waiting time within a designed limits (100ms).
* Measure time it takes to make read_status() call and adjust
* number of retries accordingly.
*/
flags = intr_disable();
tscval[0] = rdtsc();
read_status(sc);
tscval[1] = rdtsc();
DELAY(1000);
tscval[2] = rdtsc();
intr_restore(flags);
read_delay = tscval[1] - tscval[0];
read_delay /= (tscval[2] - tscval[1]) / 1000;
sc->retry = 100000 / ((KBDD_DELAYTIME * 2) + read_delay);
#else
sc->retry = 5000;
#endif
return 0;
}
@ -380,10 +416,12 @@ removeq(kqueue *q)
static int
wait_while_controller_busy(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 100msec at most */
int retry = 5000;
int retry;
int f;
/* CPU will stay inside the loop for 100msec at most */
retry = kbdc->retry;
while ((f = read_status(kbdc)) & KBDS_INPUT_BUFFER_FULL) {
if ((f & KBDS_BUFFER_FULL) == KBDS_KBD_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
@ -406,10 +444,12 @@ wait_while_controller_busy(struct atkbdc_softc *kbdc)
static int
wait_for_data(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
while ((f = read_status(kbdc) & KBDS_ANY_BUFFER_FULL) == 0) {
DELAY(KBDC_DELAYTIME);
if (--retry < 0)
@ -423,10 +463,12 @@ wait_for_data(struct atkbdc_softc *kbdc)
static int
wait_for_kbd_data(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
while ((f = read_status(kbdc) & KBDS_BUFFER_FULL)
!= KBDS_KBD_BUFFER_FULL) {
if (f == KBDS_AUX_BUFFER_FULL) {
@ -448,11 +490,13 @@ wait_for_kbd_data(struct atkbdc_softc *kbdc)
static int
wait_for_kbd_ack(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int retry;
int f;
int b;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
while (retry-- > 0) {
if ((f = read_status(kbdc)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);
@ -475,10 +519,12 @@ wait_for_kbd_ack(struct atkbdc_softc *kbdc)
static int
wait_for_aux_data(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int retry;
int f;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
while ((f = read_status(kbdc) & KBDS_BUFFER_FULL)
!= KBDS_AUX_BUFFER_FULL) {
if (f == KBDS_KBD_BUFFER_FULL) {
@ -500,11 +546,13 @@ wait_for_aux_data(struct atkbdc_softc *kbdc)
static int
wait_for_aux_ack(struct atkbdc_softc *kbdc)
{
/* CPU will stay inside the loop for 200msec at most */
int retry = 10000;
int retry;
int f;
int b;
/* CPU will stay inside the loop for 200msec at most */
retry = kbdc->retry * 2;
while (retry-- > 0) {
if ((f = read_status(kbdc)) & KBDS_ANY_BUFFER_FULL) {
DELAY(KBDD_DELAYTIME);

1
sys/dev/atkbdc/atkbdc_ebus.c
View File

@ -202,6 +202,7 @@ atkbdc_ebus_attach(device_t dev)
"cannot determine command/data port resource\n");
return (ENXIO);
}
sc->retry = 5000;
sc->port0 = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, start, start,
1, RF_ACTIVE);
if (sc->port0 == NULL) {

7
sys/dev/atkbdc/atkbdc_isa.c
View File

@ -94,7 +94,7 @@ atkbdc_isa_probe(device_t dev)
u_long count;
int error;
int rid;
#if defined(__i386__)
#if defined(__i386__) || defined(__amd64__)
bus_space_tag_t tag;
bus_space_handle_t ioh1;
volatile int i;
@ -141,7 +141,7 @@ atkbdc_isa_probe(device_t dev)
return ENXIO;
}
#if defined(__i386__)
#if defined(__i386__) || defined(__amd64__)
/*
* Check if we really have AT keyboard controller. Poll status
* register until we get "all clear" indication. If no such
@ -161,6 +161,8 @@ atkbdc_isa_probe(device_t dev)
if (i == 65535) {
bus_release_resource(dev, SYS_RES_IOPORT, 0, port0);
bus_release_resource(dev, SYS_RES_IOPORT, 1, port1);
if (bootverbose)
device_printf(dev, "AT keyboard controller not found\n");
return ENXIO;
}
#endif
@ -201,6 +203,7 @@ atkbdc_isa_attach(device_t dev)
}
rid = 0;
sc->retry = 5000;
sc->port0 = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,
RF_ACTIVE);
if (sc->port0 == NULL)

1
sys/dev/atkbdc/atkbdcreg.h
View File

@ -200,6 +200,7 @@ typedef struct atkbdc_softc {
int lock; /* FIXME: XXX not quite a semaphore... */
kqueue kbd; /* keyboard data queue */
kqueue aux; /* auxiliary data queue */
int retry;
} atkbdc_softc_t;
enum kbdc_device_ivar {