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ensure the device's UVM pager object is present before using uvm_pageratop

This commit is contained in:
tnn 2019-03-17 04:03:17 +00:00
parent 677a1b79fa
commit aacc46c31c
2 changed files with 38 additions and 6 deletions
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41
sys/dev/ic/ssdfb.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ssdfb.c,v 1.2 2019/03/17 01:33:02 tnn Exp $ */
/* $NetBSD: ssdfb.c,v 1.3 2019/03/17 04:03:17 tnn Exp $ */
/*
* Copyright (c) 2019 The NetBSD Foundation, Inc.
@ -30,13 +30,15 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ssdfb.c,v 1.2 2019/03/17 01:33:02 tnn Exp $");
__KERNEL_RCSID(0, "$NetBSD: ssdfb.c,v 1.3 2019/03/17 04:03:17 tnn Exp $");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <uvm/uvm_page.h>
#include <uvm/uvm_device.h>
#include <sys/condvar.h>
#include <sys/kmem.h>
#include <sys/kthread.h>
@ -75,6 +77,7 @@ static int ssdfb_set_display_on(struct ssdfb_softc *, bool, bool);
static int ssdfb_set_mode(struct ssdfb_softc *, u_int);
/* frame buffer damage tracking and synchronization */
static void ssdfb_udv_attach(struct ssdfb_softc *sc);
static bool ssdfb_is_modified(struct ssdfb_softc *sc);
static bool ssdfb_clear_modify(struct ssdfb_softc *sc);
static void ssdfb_damage(struct ssdfb_softc *);
@ -189,7 +192,6 @@ static const struct wsdisplay_accessops ssdfb_accessops = {
#define SSDFB_CMD1(c) do { cmd[0] = (c); error = sc->sc_cmd(sc->sc_cookie, cmd, 1, usepoll); } while(0)
#define SSDFB_CMD2(c, a) do { cmd[0] = (c); cmd[1] = (a); error = sc->sc_cmd(sc->sc_cookie, cmd, 2, usepoll); } while(0)
#define SSDFB_CMD3(c, a, b) do { cmd[0] = (c); cmd[1] = (a); cmd[2] = (b); error = sc->sc_cmd(sc->sc_cookie, cmd, 3, usepoll); } while(0)
void
ssdfb_attach(struct ssdfb_softc *sc, int flags)
@ -349,6 +351,11 @@ ssdfb_detach(struct ssdfb_softc *sc)
mutex_exit(&sc->sc_cond_mtx);
kthread_join(sc->sc_thread);
if (sc->sc_uobj != NULL) {
mutex_enter(sc->sc_uobj->vmobjlock);
sc->sc_uobj->uo_refs--;
mutex_exit(sc->sc_uobj->vmobjlock);
}
config_detach(sc->sc_wsdisplay, DETACH_FORCE);
cv_destroy(&sc->sc_cond);
@ -441,7 +448,7 @@ ssdfb_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l)
case WSDISPLAYIO_GETCMAP:
wc = (struct wsdisplay_cmap *)data;
if (wc->index >= __arraycount(cmap) ||
wc->count >= __arraycount(cmap) - wc->index)
wc->count > __arraycount(cmap) - wc->index)
return EINVAL;
error = copyout(&cmap[wc->index], wc->red, wc->count);
if (error)
@ -576,7 +583,7 @@ static int
ssdfb_init(struct ssdfb_softc *sc)
{
int error;
uint8_t cmd[3];
uint8_t cmd[2];
bool usepoll = true;
/*
@ -745,6 +752,18 @@ ssdfb_damage(struct ssdfb_softc *sc)
}
}
static void
ssdfb_udv_attach(struct ssdfb_softc *sc)
{
extern const struct cdevsw wsdisplay_cdevsw;
dev_t dev;
#define WSDISPLAYMINOR(unit, screen) (((unit) << 8) | (screen))
dev = makedev(cdevsw_lookup_major(&wsdisplay_cdevsw),
WSDISPLAYMINOR(device_unit(sc->sc_wsdisplay), 0));
sc->sc_uobj = udv_attach(dev, VM_PROT_READ|VM_PROT_WRITE, 0,
sc->sc_ri_bits_len);
}
static bool
ssdfb_is_modified(struct ssdfb_softc *sc)
{
@ -753,6 +772,9 @@ ssdfb_is_modified(struct ssdfb_softc *sc)
if (sc->sc_mode == WSDISPLAYIO_MODE_EMUL)
return sc->sc_modified;
if (sc->sc_uobj == NULL)
return false;
va = (vaddr_t)sc->sc_ri.ri_bits;
va_end = va + sc->sc_ri_bits_len;
while (va < va_end) {
@ -776,6 +798,9 @@ ssdfb_clear_modify(struct ssdfb_softc *sc)
return ret;
}
if (sc->sc_uobj == NULL)
return false;
va = (vaddr_t)sc->sc_ri.ri_bits;
va_end = va + sc->sc_ri_bits_len;
ret = false;
@ -800,6 +825,12 @@ ssdfb_thread(void *arg)
ssdfb_set_usepoll(sc, false);
while(!sc->sc_detaching) {
if (sc->sc_mode == WSDISPLAYIO_MODE_DUMBFB &&
sc->sc_uobj == NULL) {
mutex_exit(&sc->sc_cond_mtx);
ssdfb_udv_attach(sc);
mutex_enter(&sc->sc_cond_mtx);
}
if (!ssdfb_is_modified(sc)) {
if (cv_timedwait(&sc->sc_cond, &sc->sc_cond_mtx,
sc->sc_mode == WSDISPLAYIO_MODE_EMUL

3
sys/dev/ic/ssdfbvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: ssdfbvar.h,v 1.1 2019/03/17 00:57:15 tnn Exp $ */
/* $NetBSD: ssdfbvar.h,v 1.2 2019/03/17 04:03:17 tnn Exp $ */
/*
* Copyright (c) 2019 The NetBSD Foundation, Inc.
@ -225,6 +225,7 @@ struct ssdfb_softc {
bool sc_detaching;
int sc_backoff;
bool sc_modified;
struct uvm_object *sc_uobj;
/* reference to bus-specific code */
void *sc_cookie;