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A clean fix for the spl "deadlock before smp_active" problem.

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Added a new variable, 'bsp_apic_ready', which is set as soon as the bootstrap
CPU has initialized its local APIC.  Conditionalize the GENSPLR functions
to call ss_lock ONLY after bsp_apic_ready is TRUE;  This should prevent
any problems with races between the time the 1st AP becomes ready and the
time smp_active is set.
This commit is contained in:
Steve Passe 1997-08-24 20:33:32 +00:00
parent 32a7305976
commit 8ee0110a44
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=28669
11 changed files with 49 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/amd64/amd64/mp_machdep.c
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

4
sys/amd64/amd64/mptable.c
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

4
sys/amd64/include/mptable.h
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

3
sys/amd64/include/smp.h
View File

@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: smp.h,v 1.23 1997/08/21 04:48:45 smp Exp smp $
* $Id: smp.h,v 1.24 1997/08/24 20:17:05 smp Exp smp $
*
*/
@ -85,6 +85,7 @@ u_int io_apic_read __P((int, int));
void io_apic_write __P((int, int, u_int));
/* global data in mp_machdep.c */
extern int bsp_apic_ready;
extern int mp_ncpus;
extern int mp_naps;
extern int mp_nbusses;

4
sys/i386/i386/mp_machdep.c
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

4
sys/i386/i386/mptable.c
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

4
sys/i386/include/mptable.h
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

3
sys/i386/include/smp.h
View File

@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: smp.h,v 1.23 1997/08/21 04:48:45 smp Exp smp $
* $Id: smp.h,v 1.24 1997/08/24 20:17:05 smp Exp smp $
*
*/
@ -85,6 +85,7 @@ u_int io_apic_read __P((int, int));
void io_apic_write __P((int, int, u_int));
/* global data in mp_machdep.c */
extern int bsp_apic_ready;
extern int mp_ncpus;
extern int mp_naps;
extern int mp_nbusses;

41
sys/i386/isa/ipl_funcs.c
View File

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: ipl_funcs.c,v 1.3 1997/08/24 00:05:18 fsmp Exp $
* $Id: ipl_funcs.c,v 1.7 1997/08/24 20:18:28 smp Exp smp $
*/
#include <sys/types.h>
@ -98,6 +98,7 @@ splx(unsigned ipl)
#include <machine/param.h>
#include <machine/smp.h>
extern int bspEarly; /* XXX */
#if defined(REAL_IFCPL)
@ -146,6 +147,7 @@ softclockpending(void)
}
#ifdef notneeded
#define GENSPL(name, set_cpl) \
unsigned name(void) \
{ \
@ -159,38 +161,39 @@ unsigned name(void) \
\
return (x); \
}
#endif /* notneeded */
/*
* This version has to check for smp_active,
* This version has to check for bsp_apic_ready,
* as calling simple_lock() (ie ss_lock) before then deadlocks the system.
* A sample count of GENSPLR calls before bsp_apic_ready was set: 2193
*/
#define GENSPL2(name, set_cpl) \
#define GENSPLR(name, set_cpl) \
unsigned name(void) \
{ \
unsigned x; \
\
if (smp_active) \
if (bsp_apic_ready) \
IFCPL_LOCK(); \
x = cpl; \
/* XXX test cil */ \
set_cpl; \
if (smp_active) \
if (bsp_apic_ready) \
IFCPL_UNLOCK(); \
\
return (x); \
}
GENSPL2(splbio, cpl |= bio_imask)
GENSPL2(splclock, cpl = HWI_MASK | SWI_MASK)
GENSPL2(splimp, cpl |= net_imask)
GENSPL2(splnet, cpl |= SWI_NET_MASK)
GENSPL2(splsoftclock, cpl = SWI_CLOCK_MASK)
GENSPL2(splsofttty, cpl |= SWI_TTY_MASK)
GENSPL2(splstatclock, cpl |= stat_imask)
GENSPL2(splvm, cpl |= net_imask | bio_imask)
GENSPL2(splhigh, cpl = HWI_MASK | SWI_MASK)
GENSPL2(spltty, cpl |= tty_imask)
GENSPLR(splbio, cpl |= bio_imask)
GENSPLR(splclock, cpl = HWI_MASK | SWI_MASK)
GENSPLR(splhigh, cpl = HWI_MASK | SWI_MASK)
GENSPLR(splimp, cpl |= net_imask)
GENSPLR(splnet, cpl |= SWI_NET_MASK)
GENSPLR(splsoftclock, cpl = SWI_CLOCK_MASK)
GENSPLR(splsofttty, cpl |= SWI_TTY_MASK)
GENSPLR(splstatclock, cpl |= stat_imask)
GENSPLR(spltty, cpl |= tty_imask)
GENSPLR(splvm, cpl |= net_imask | bio_imask)
void
@ -211,18 +214,18 @@ spl0(void)
void
splx(unsigned ipl)
{
if (smp_active)
if (bsp_apic_ready)
IFCPL_LOCK();
/* XXX test cil */
cpl = ipl;
if (ipending & ~ipl) {
if (smp_active)
if (bsp_apic_ready)
IFCPL_UNLOCK();
splz();
}
else
if (smp_active)
if (bsp_apic_ready)
IFCPL_UNLOCK();
}

4
sys/kern/subr_smp.c
View File

@ -22,7 +22,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: mp_machdep.c,v 1.29 1997/08/21 04:53:27 smp Exp smp $
* $Id: mp_machdep.c,v 1.30 1997/08/24 20:19:47 smp Exp smp $
*/
#include "opt_smp.h"
@ -207,6 +207,7 @@ int current_postcode;
/** XXX FIXME: what system files declare these??? */
extern struct region_descriptor r_gdt, r_idt;
int bsp_apic_ready = 0; /* flags useability of BSP apic */
int mp_ncpus; /* # of CPUs, including BSP */
int mp_naps; /* # of Applications processors */
int mp_nbusses; /* # of busses */
@ -1480,6 +1481,7 @@ start_all_aps(u_int boot_addr)
/* initialize BSP's local APIC */
apic_initialize();
bsp_apic_ready = 1;
/* install the AP 1st level boot code */
install_ap_tramp(boot_addr);

3
sys/sys/smp.h
View File

@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: smp.h,v 1.23 1997/08/21 04:48:45 smp Exp smp $
* $Id: smp.h,v 1.24 1997/08/24 20:17:05 smp Exp smp $
*
*/
@ -85,6 +85,7 @@ u_int io_apic_read __P((int, int));
void io_apic_write __P((int, int, u_int));
/* global data in mp_machdep.c */
extern int bsp_apic_ready;
extern int mp_ncpus;
extern int mp_naps;
extern int mp_nbusses;