mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-29 22:46:47 +07:00
1dbd30e989
This changes the TCM handling so that a fixed area is reserved at 0xfffe0000-0xfffeffff for TCM. This areas is used by XScale but XScale does not have TCM so the mechanisms are mutually exclusive. This change is needed to make TCM detection more dynamic while still being able to compile code into it, and is a must for the unified ARM goals: the current TCM allocation at different places in memory for each machine would be a nightmare if you want to compile a single image for more than one machine with TCM so it has to be nailed down in one place. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
727 lines
17 KiB
C
727 lines
17 KiB
C
/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <asm/mach-types.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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static unsigned long phys_initrd_start __initdata = 0;
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static unsigned long phys_initrd_size __initdata = 0;
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static int __init early_initrd(char *p)
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{
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unsigned long start, size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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static int __init parse_tag_initrd(const struct tag *tag)
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{
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printk(KERN_WARNING "ATAG_INITRD is deprecated; "
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"please update your bootloader.\n");
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phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD, parse_tag_initrd);
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static int __init parse_tag_initrd2(const struct tag *tag)
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{
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phys_initrd_start = tag->u.initrd.start;
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD2, parse_tag_initrd2);
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/*
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* This keeps memory configuration data used by a couple memory
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* initialization functions, as well as show_mem() for the skipping
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* of holes in the memory map. It is populated by arm_add_memory().
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*/
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struct meminfo meminfo;
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void show_mem(void)
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{
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int free = 0, total = 0, reserved = 0;
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int shared = 0, cached = 0, slab = 0, node, i;
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struct meminfo * mi = &meminfo;
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printk("Mem-info:\n");
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show_free_areas();
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for_each_online_node(node) {
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for_each_nodebank (i,mi,node) {
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struct membank *bank = &mi->bank[i];
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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do {
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (PageSlab(page))
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slab++;
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else if (!page_count(page))
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free++;
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else
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shared += page_count(page) - 1;
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page++;
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} while (page < end);
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}
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}
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printk("%d pages of RAM\n", total);
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printk("%d free pages\n", free);
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printk("%d reserved pages\n", reserved);
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printk("%d slab pages\n", slab);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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}
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static void __init find_node_limits(int node, struct meminfo *mi,
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unsigned long *min, unsigned long *max_low, unsigned long *max_high)
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{
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int i;
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*min = -1UL;
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*max_low = *max_high = 0;
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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unsigned long start, end;
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start = bank_pfn_start(bank);
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end = bank_pfn_end(bank);
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if (*min > start)
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*min = start;
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if (*max_high < end)
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*max_high = end;
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if (bank->highmem)
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continue;
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if (*max_low < end)
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*max_low = end;
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}
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}
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/*
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* FIXME: We really want to avoid allocating the bootmap bitmap
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* over the top of the initrd. Hopefully, this is located towards
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* the start of a bank, so if we allocate the bootmap bitmap at
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* the end, we won't clash.
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*/
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static unsigned int __init
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find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
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{
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unsigned int start_pfn, i, bootmap_pfn;
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start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
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bootmap_pfn = 0;
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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unsigned int start, end;
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start = bank_pfn_start(bank);
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end = bank_pfn_end(bank);
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if (end < start_pfn)
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continue;
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if (start < start_pfn)
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start = start_pfn;
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if (end <= start)
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continue;
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if (end - start >= bootmap_pages) {
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bootmap_pfn = start;
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break;
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}
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}
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if (bootmap_pfn == 0)
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BUG();
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return bootmap_pfn;
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}
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static int __init check_initrd(struct meminfo *mi)
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{
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int initrd_node = -2;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned long end = phys_initrd_start + phys_initrd_size;
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/*
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* Make sure that the initrd is within a valid area of
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* memory.
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*/
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if (phys_initrd_size) {
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unsigned int i;
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initrd_node = -1;
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for (i = 0; i < mi->nr_banks; i++) {
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struct membank *bank = &mi->bank[i];
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if (bank_phys_start(bank) <= phys_initrd_start &&
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end <= bank_phys_end(bank))
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initrd_node = bank->node;
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}
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}
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if (initrd_node == -1) {
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printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
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"physical memory - disabling initrd\n",
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phys_initrd_start, phys_initrd_size);
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phys_initrd_start = phys_initrd_size = 0;
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}
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#endif
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return initrd_node;
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}
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static void __init bootmem_init_node(int node, struct meminfo *mi,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long boot_pfn;
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unsigned int boot_pages;
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pg_data_t *pgdat;
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int i;
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/*
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* Allocate the bootmem bitmap page.
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*/
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boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
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/*
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* Initialise the bootmem allocator for this node, handing the
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* memory banks over to bootmem.
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*/
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node_set_online(node);
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pgdat = NODE_DATA(node);
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init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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if (!bank->highmem)
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free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
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}
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/*
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* Reserve the bootmem bitmap for this node.
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*/
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reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
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boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
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}
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static void __init bootmem_reserve_initrd(int node)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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pg_data_t *pgdat = NODE_DATA(node);
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int res;
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res = reserve_bootmem_node(pgdat, phys_initrd_start,
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phys_initrd_size, BOOTMEM_EXCLUSIVE);
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if (res == 0) {
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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} else {
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printk(KERN_ERR
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"INITRD: 0x%08lx+0x%08lx overlaps in-use "
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"memory region - disabling initrd\n",
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phys_initrd_start, phys_initrd_size);
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}
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#endif
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}
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static void __init bootmem_free_node(int node, struct meminfo *mi)
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{
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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unsigned long min, max_low, max_high;
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int i;
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find_node_limits(node, mi, &min, &max_low, &max_high);
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/*
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* initialise the zones within this node.
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*/
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memset(zone_size, 0, sizeof(zone_size));
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/*
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* The size of this node has already been determined. If we need
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* to do anything fancy with the allocation of this memory to the
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* zones, now is the time to do it.
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*/
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zone_size[0] = max_low - min;
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#ifdef CONFIG_HIGHMEM
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zone_size[ZONE_HIGHMEM] = max_high - max_low;
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#endif
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/*
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* For each bank in this node, calculate the size of the holes.
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* holes = node_size - sum(bank_sizes_in_node)
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*/
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_nodebank(i, mi, node) {
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int idx = 0;
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#ifdef CONFIG_HIGHMEM
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if (mi->bank[i].highmem)
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idx = ZONE_HIGHMEM;
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#endif
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zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
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}
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/*
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* Adjust the sizes according to any special requirements for
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* this machine type.
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*/
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arch_adjust_zones(node, zone_size, zhole_size);
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free_area_init_node(node, zone_size, min, zhole_size);
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}
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#ifndef CONFIG_SPARSEMEM
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int pfn_valid(unsigned long pfn)
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{
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struct meminfo *mi = &meminfo;
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unsigned int left = 0, right = mi->nr_banks;
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do {
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unsigned int mid = (right + left) / 2;
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struct membank *bank = &mi->bank[mid];
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if (pfn < bank_pfn_start(bank))
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right = mid;
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else if (pfn >= bank_pfn_end(bank))
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left = mid + 1;
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else
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return 1;
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} while (left < right);
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return 0;
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}
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EXPORT_SYMBOL(pfn_valid);
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static void arm_memory_present(struct meminfo *mi, int node)
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{
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}
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#else
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static void arm_memory_present(struct meminfo *mi, int node)
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{
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int i;
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
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}
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}
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#endif
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void __init bootmem_init(void)
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{
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struct meminfo *mi = &meminfo;
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unsigned long min, max_low, max_high;
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int node, initrd_node;
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/*
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* Locate which node contains the ramdisk image, if any.
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*/
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initrd_node = check_initrd(mi);
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max_low = max_high = 0;
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/*
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* Run through each node initialising the bootmem allocator.
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*/
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for_each_node(node) {
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unsigned long node_low, node_high;
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find_node_limits(node, mi, &min, &node_low, &node_high);
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if (node_low > max_low)
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max_low = node_low;
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if (node_high > max_high)
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max_high = node_high;
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/*
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* If there is no memory in this node, ignore it.
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* (We can't have nodes which have no lowmem)
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*/
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if (node_low == 0)
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continue;
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bootmem_init_node(node, mi, min, node_low);
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/*
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* Reserve any special node zero regions.
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*/
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if (node == 0)
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reserve_node_zero(NODE_DATA(node));
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/*
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* If the initrd is in this node, reserve its memory.
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*/
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if (node == initrd_node)
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bootmem_reserve_initrd(node);
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/*
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* Sparsemem tries to allocate bootmem in memory_present(),
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* so must be done after the fixed reservations
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*/
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arm_memory_present(mi, node);
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}
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/*
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* sparse_init() needs the bootmem allocator up and running.
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*/
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sparse_init();
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/*
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* Now free memory in each node - free_area_init_node needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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for_each_node(node)
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bootmem_free_node(node, mi);
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high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
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/*
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* This doesn't seem to be used by the Linux memory manager any
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* more, but is used by ll_rw_block. If we can get rid of it, we
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* also get rid of some of the stuff above as well.
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*
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* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
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* the system, not the maximum PFN.
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*/
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max_low_pfn = max_low - PHYS_PFN_OFFSET;
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max_pfn = max_high - PHYS_PFN_OFFSET;
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}
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static inline int free_area(unsigned long pfn, unsigned long end, char *s)
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{
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unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
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for (; pfn < end; pfn++) {
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struct page *page = pfn_to_page(pfn);
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ClearPageReserved(page);
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init_page_count(page);
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__free_page(page);
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pages++;
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}
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if (size && s)
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printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
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return pages;
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}
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static inline void
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free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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unsigned long pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn - 1) + 1;
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end_pg = pfn_to_page(end_pfn);
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/*
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* Convert to physical addresses, and
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* round start upwards and end downwards.
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*/
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pg = PAGE_ALIGN(__pa(start_pg));
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pgend = __pa(end_pg) & PAGE_MASK;
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/*
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* If there are free pages between these,
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* free the section of the memmap array.
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*/
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if (pg < pgend)
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free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
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}
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/*
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* The mem_map array can get very big. Free the unused area of the memory map.
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*/
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static void __init free_unused_memmap_node(int node, struct meminfo *mi)
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{
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unsigned long bank_start, prev_bank_end = 0;
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unsigned int i;
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/*
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* [FIXME] This relies on each bank being in address order. This
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* may not be the case, especially if the user has provided the
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* information on the command line.
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*/
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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bank_start = bank_pfn_start(bank);
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if (bank_start < prev_bank_end) {
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printk(KERN_ERR "MEM: unordered memory banks. "
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"Not freeing memmap.\n");
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break;
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}
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/*
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* If we had a previous bank, and there is a space
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* between the current bank and the previous, free it.
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*/
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if (prev_bank_end && prev_bank_end != bank_start)
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free_memmap(node, prev_bank_end, bank_start);
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prev_bank_end = bank_pfn_end(bank);
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}
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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unsigned long reserved_pages, free_pages;
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|
int i, node;
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#ifdef CONFIG_HAVE_TCM
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/* These pointers are filled in on TCM detection */
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extern u32 dtcm_end;
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extern u32 itcm_end;
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#endif
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|
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|
#ifndef CONFIG_DISCONTIGMEM
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max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
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#endif
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|
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|
/* this will put all unused low memory onto the freelists */
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for_each_online_node(node) {
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pg_data_t *pgdat = NODE_DATA(node);
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|
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free_unused_memmap_node(node, &meminfo);
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|
|
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if (pgdat->node_spanned_pages != 0)
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totalram_pages += free_all_bootmem_node(pgdat);
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}
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|
|
|
#ifdef CONFIG_SA1111
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/* now that our DMA memory is actually so designated, we can free it */
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totalram_pages += free_area(PHYS_PFN_OFFSET,
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__phys_to_pfn(__pa(swapper_pg_dir)), NULL);
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#endif
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|
|
|
#ifdef CONFIG_HIGHMEM
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|
/* set highmem page free */
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|
for_each_online_node(node) {
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for_each_nodebank (i, &meminfo, node) {
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unsigned long start = bank_pfn_start(&meminfo.bank[i]);
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unsigned long end = bank_pfn_end(&meminfo.bank[i]);
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if (start >= max_low_pfn + PHYS_PFN_OFFSET)
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totalhigh_pages += free_area(start, end, NULL);
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}
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|
}
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|
totalram_pages += totalhigh_pages;
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#endif
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|
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reserved_pages = free_pages = 0;
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|
|
|
for_each_online_node(node) {
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for_each_nodebank(i, &meminfo, node) {
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|
struct membank *bank = &meminfo.bank[i];
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|
unsigned int pfn1, pfn2;
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struct page *page, *end;
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|
|
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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|
|
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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|
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do {
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|
if (PageReserved(page))
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|
reserved_pages++;
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else if (!page_count(page))
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|
free_pages++;
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|
page++;
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|
} while (page < end);
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|
}
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|
}
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|
|
|
/*
|
|
* Since our memory may not be contiguous, calculate the
|
|
* real number of pages we have in this system
|
|
*/
|
|
printk(KERN_INFO "Memory:");
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|
num_physpages = 0;
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|
for (i = 0; i < meminfo.nr_banks; i++) {
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num_physpages += bank_pfn_size(&meminfo.bank[i]);
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|
printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
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|
}
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|
printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
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|
|
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printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
|
|
nr_free_pages() << (PAGE_SHIFT-10),
|
|
free_pages << (PAGE_SHIFT-10),
|
|
reserved_pages << (PAGE_SHIFT-10),
|
|
totalhigh_pages << (PAGE_SHIFT-10));
|
|
|
|
#define MLK(b, t) b, t, ((t) - (b)) >> 10
|
|
#define MLM(b, t) b, t, ((t) - (b)) >> 20
|
|
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
|
|
|
|
printk(KERN_NOTICE "Virtual kernel memory layout:\n"
|
|
" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#ifdef CONFIG_HAVE_TCM
|
|
" DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
" ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#endif
|
|
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
|
#ifdef CONFIG_MMU
|
|
" DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#endif
|
|
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#ifdef CONFIG_HIGHMEM
|
|
" pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#endif
|
|
" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .data : 0x%p" " - 0x%p" " (%4d kB)\n",
|
|
|
|
MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
|
|
(PAGE_SIZE)),
|
|
#ifdef CONFIG_HAVE_TCM
|
|
MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
|
|
MLK(ITCM_OFFSET, (unsigned long) itcm_end),
|
|
#endif
|
|
MLK(FIXADDR_START, FIXADDR_TOP),
|
|
#ifdef CONFIG_MMU
|
|
MLM(CONSISTENT_BASE, CONSISTENT_END),
|
|
#endif
|
|
MLM(VMALLOC_START, VMALLOC_END),
|
|
MLM(PAGE_OFFSET, (unsigned long)high_memory),
|
|
#ifdef CONFIG_HIGHMEM
|
|
MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
|
|
(PAGE_SIZE)),
|
|
#endif
|
|
MLM(MODULES_VADDR, MODULES_END),
|
|
|
|
MLK_ROUNDUP(__init_begin, __init_end),
|
|
MLK_ROUNDUP(_text, _etext),
|
|
MLK_ROUNDUP(_data, _edata));
|
|
|
|
#undef MLK
|
|
#undef MLM
|
|
#undef MLK_ROUNDUP
|
|
|
|
/*
|
|
* Check boundaries twice: Some fundamental inconsistencies can
|
|
* be detected at build time already.
|
|
*/
|
|
#ifdef CONFIG_MMU
|
|
BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
|
|
BUG_ON(VMALLOC_END > CONSISTENT_BASE);
|
|
|
|
BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
|
|
BUG_ON(TASK_SIZE > MODULES_VADDR);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
|
|
BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
|
|
#endif
|
|
|
|
if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
|
|
extern int sysctl_overcommit_memory;
|
|
/*
|
|
* On a machine this small we won't get
|
|
* anywhere without overcommit, so turn
|
|
* it on by default.
|
|
*/
|
|
sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
|
|
}
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
#ifdef CONFIG_HAVE_TCM
|
|
extern char __tcm_start, __tcm_end;
|
|
|
|
totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
|
|
__phys_to_pfn(__pa(&__tcm_end)),
|
|
"TCM link");
|
|
#endif
|
|
|
|
if (!machine_is_integrator() && !machine_is_cintegrator())
|
|
totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
|
|
__phys_to_pfn(__pa(__init_end)),
|
|
"init");
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
static int keep_initrd;
|
|
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (!keep_initrd)
|
|
totalram_pages += free_area(__phys_to_pfn(__pa(start)),
|
|
__phys_to_pfn(__pa(end)),
|
|
"initrd");
|
|
}
|
|
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
keep_initrd = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|