mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 05:56:56 +07:00
3c726f8dee
Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
228 lines
6.0 KiB
C
228 lines
6.0 KiB
C
/*
|
|
* PowerPC version
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
|
|
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
|
|
* Copyright (C) 1996 Paul Mackerras
|
|
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
|
|
*
|
|
* Derived from "arch/i386/mm/init.c"
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Dave Engebretsen <engebret@us.ibm.com>
|
|
* Rework for PPC64 port.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/lmb.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/eeh.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmzone.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/ppcdebug.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/imalloc.h>
|
|
|
|
#if PGTABLE_RANGE > USER_VSID_RANGE
|
|
#warning Limited user VSID range means pagetable space is wasted
|
|
#endif
|
|
|
|
#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
|
|
#warning TASK_SIZE is smaller than it needs to be.
|
|
#endif
|
|
|
|
unsigned long klimit = (unsigned long)_end;
|
|
|
|
/* max amount of RAM to use */
|
|
unsigned long __max_memory;
|
|
|
|
/* info on what we think the IO hole is */
|
|
unsigned long io_hole_start;
|
|
unsigned long io_hole_size;
|
|
|
|
/*
|
|
* Do very early mm setup.
|
|
*/
|
|
void __init mm_init_ppc64(void)
|
|
{
|
|
#ifndef CONFIG_PPC_ISERIES
|
|
unsigned long i;
|
|
#endif
|
|
|
|
ppc64_boot_msg(0x100, "MM Init");
|
|
|
|
/* This is the story of the IO hole... please, keep seated,
|
|
* unfortunately, we are out of oxygen masks at the moment.
|
|
* So we need some rough way to tell where your big IO hole
|
|
* is. On pmac, it's between 2G and 4G, on POWER3, it's around
|
|
* that area as well, on POWER4 we don't have one, etc...
|
|
* We need that as a "hint" when sizing the TCE table on POWER3
|
|
* So far, the simplest way that seem work well enough for us it
|
|
* to just assume that the first discontinuity in our physical
|
|
* RAM layout is the IO hole. That may not be correct in the future
|
|
* (and isn't on iSeries but then we don't care ;)
|
|
*/
|
|
|
|
#ifndef CONFIG_PPC_ISERIES
|
|
for (i = 1; i < lmb.memory.cnt; i++) {
|
|
unsigned long base, prevbase, prevsize;
|
|
|
|
prevbase = lmb.memory.region[i-1].base;
|
|
prevsize = lmb.memory.region[i-1].size;
|
|
base = lmb.memory.region[i].base;
|
|
if (base > (prevbase + prevsize)) {
|
|
io_hole_start = prevbase + prevsize;
|
|
io_hole_size = base - (prevbase + prevsize);
|
|
break;
|
|
}
|
|
}
|
|
#endif /* CONFIG_PPC_ISERIES */
|
|
if (io_hole_start)
|
|
printk("IO Hole assumed to be %lx -> %lx\n",
|
|
io_hole_start, io_hole_start + io_hole_size - 1);
|
|
|
|
ppc64_boot_msg(0x100, "MM Init Done");
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long addr;
|
|
|
|
addr = (unsigned long)__init_begin;
|
|
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
|
|
memset((void *)addr, 0xcc, PAGE_SIZE);
|
|
ClearPageReserved(virt_to_page(addr));
|
|
set_page_count(virt_to_page(addr), 1);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk ("Freeing unused kernel memory: %luk freed\n",
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start < end)
|
|
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
set_page_count(virt_to_page(start), 1);
|
|
free_page(start);
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static struct kcore_list kcore_vmem;
|
|
|
|
static int __init setup_kcore(void)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < lmb.memory.cnt; i++) {
|
|
unsigned long base, size;
|
|
struct kcore_list *kcore_mem;
|
|
|
|
base = lmb.memory.region[i].base;
|
|
size = lmb.memory.region[i].size;
|
|
|
|
/* GFP_ATOMIC to avoid might_sleep warnings during boot */
|
|
kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
|
|
if (!kcore_mem)
|
|
panic("mem_init: kmalloc failed\n");
|
|
|
|
kclist_add(kcore_mem, __va(base), size);
|
|
}
|
|
|
|
kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
|
|
|
|
return 0;
|
|
}
|
|
module_init(setup_kcore);
|
|
|
|
static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
|
|
{
|
|
memset(addr, 0, kmem_cache_size(cache));
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_64K_PAGES
|
|
static const int pgtable_cache_size[2] = {
|
|
PTE_TABLE_SIZE, PGD_TABLE_SIZE
|
|
};
|
|
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
|
|
"pte_pmd_cache", "pgd_cache",
|
|
};
|
|
#else
|
|
static const int pgtable_cache_size[2] = {
|
|
PTE_TABLE_SIZE, PMD_TABLE_SIZE
|
|
};
|
|
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
|
|
"pgd_pte_cache", "pud_pmd_cache",
|
|
};
|
|
#endif /* CONFIG_PPC_64K_PAGES */
|
|
|
|
kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
|
|
|
|
void pgtable_cache_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
|
|
int size = pgtable_cache_size[i];
|
|
const char *name = pgtable_cache_name[i];
|
|
|
|
pgtable_cache[i] = kmem_cache_create(name,
|
|
size, size,
|
|
SLAB_HWCACHE_ALIGN |
|
|
SLAB_MUST_HWCACHE_ALIGN,
|
|
zero_ctor,
|
|
NULL);
|
|
if (! pgtable_cache[i])
|
|
panic("pgtable_cache_init(): could not create %s!\n",
|
|
name);
|
|
}
|
|
}
|