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Add a tunable to set the number of active cores, and enable SMP by default.

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This commit is contained in:
Ian Lepore 2014-03-02 19:46:03 +00:00
parent f07b2d045f
commit f5a477a34b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=262695
2 changed files with 11 additions and 3 deletions
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2
sys/arm/conf/IMX6
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@ -143,7 +143,7 @@ options ROOTDEVNAME=\"ufs:mmcsd0s2a\"
# ARM and SoC-specific options
options FDT # Configure using FDT/DTB data.
#options SMP # Enable multiple cores
options SMP # Enable multiple cores
options VFP # Enable floating point hardware support
options FREEBSD_BOOT_LOADER # Process metadata passed from loader(8)

12
sys/arm/freescale/imx/imx6_mp.c
View file

@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/smp.h>
@ -72,6 +73,7 @@ void
platform_mp_setmaxid(void)
{
bus_space_handle_t scu;
int hwcpu, ncpu;
uint32_t val;
/* If we've already set the global vars don't bother to do it again. */
@ -81,10 +83,16 @@ platform_mp_setmaxid(void)
if (bus_space_map(fdtbus_bs_tag, SCU_PHYSBASE, SCU_SIZE, 0, &scu) != 0)
panic("Couldn't map the SCU\n");
val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_CONFIG_REG);
hwcpu = (val & SCU_CONFIG_REG_NCPU_MASK) + 1;
bus_space_unmap(fdtbus_bs_tag, scu, SCU_SIZE);
mp_maxid = (val & SCU_CONFIG_REG_NCPU_MASK);
mp_ncpus = mp_maxid + 1;
ncpu = hwcpu;
TUNABLE_INT_FETCH("hw.ncpu", &ncpu);
if (ncpu < 1 || ncpu > hwcpu)
ncpu = hwcpu;
mp_ncpus = ncpu;
mp_maxid = ncpu - 1;
}
int