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powerpc: autosize bpvo based on physical memory

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Default moea64_bpvo_pool_size 327680 was insufficient for initial
memory mapping at boot time on systems with, for example, 64G and
no huge pages enabled.

Submitted by:	Andre Silva <afscoelho@gmail.com>
Reviewed by:	jhibbits, alfredo
Approved by:	jhibbits (mentor)
Sponsored by:	Eldorado Research Institute (eldorado.org.br)
Differential Revision:	https://reviews.freebsd.org/D24102
This commit is contained in:
Alfredo Dal'Ava Junior 2020-04-15 20:33:09 +00:00
parent 3076591b7a
commit d80a924822
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=359992
1 changed files with 18 additions and 1 deletions
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19
sys/powerpc/aim/mmu_oea64.c
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@ -65,6 +65,7 @@ __FBSDID("$FreeBSD$");
#include <sys/systm.h>
#include <sys/vmmeter.h>
#include <sys/smp.h>
#include <sys/reboot.h>
#include <sys/kdb.h>
@ -184,10 +185,12 @@ uma_zone_t moea64_pvo_zone; /* zone for pvo entries */
static struct pvo_entry *moea64_bpvo_pool;
static int moea64_bpvo_pool_index = 0;
static int moea64_bpvo_pool_size = 327680;
static int moea64_bpvo_pool_size = 0;
SYSCTL_INT(_machdep, OID_AUTO, moea64_allocated_bpvo_entries, CTLFLAG_RD,
&moea64_bpvo_pool_index, 0, "");
#define BPVO_POOL_SIZE 327680 /* Sensible historical default value */
#define BPVO_POOL_EXPANSION_FACTOR 3
#define VSID_NBPW (sizeof(u_int32_t) * 8)
#ifdef __powerpc64__
#define NVSIDS (NPMAPS * 16)
@ -916,6 +919,20 @@ moea64_mid_bootstrap(mmu_t mmup, vm_offset_t kernelstart, vm_offset_t kernelend)
* Initialise the bootstrap pvo pool.
*/
TUNABLE_INT_FETCH("machdep.moea64_bpvo_pool_size", &moea64_bpvo_pool_size);
if (moea64_bpvo_pool_size == 0) {
if (!hw_direct_map)
moea64_bpvo_pool_size = ((ptoa((uintmax_t)physmem) * sizeof(struct vm_page)) /
(PAGE_SIZE * PAGE_SIZE)) * BPVO_POOL_EXPANSION_FACTOR;
else
moea64_bpvo_pool_size = BPVO_POOL_SIZE;
}
if (boothowto & RB_VERBOSE) {
printf("mmu_oea64: bpvo pool entries = %d, bpvo pool size = %ju MB\n",
moea64_bpvo_pool_size,
moea64_bpvo_pool_size*sizeof(struct pvo_entry) / 1048576);
}
moea64_bpvo_pool = (struct pvo_entry *)moea64_bootstrap_alloc(
moea64_bpvo_pool_size*sizeof(struct pvo_entry), PAGE_SIZE);
moea64_bpvo_pool_index = 0;