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linux/arch/parisc/mm/init.c
Helge Deller c9c2877d08 parisc: Add Page Deallocation Table (PDT) support 
The firmare in most parisc machines maintains a Page Deallocation Table (PDT)
which holds a list of physical memory addresses where hardware detected memory
errors (single bit and double bit errors).

This patch adds the missing PDC firmware calls and the logic to read the PDT
from firmware, report all current PDT entries and exclude the reported bad
memory from being used by Linux.

Signed-off-by: Helge Deller <deller@gmx.de>
2017-05-12 09:14:15 +02:00

936 lines
24 KiB
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/*
* linux/arch/parisc/mm/init.c
*
* Copyright (C) 1995 Linus Torvalds
* Copyright 1999 SuSE GmbH
* changed by Philipp Rumpf
* Copyright 1999 Philipp Rumpf (prumpf@tux.org)
* Copyright 2004 Randolph Chung (tausq@debian.org)
* Copyright 2006-2007 Helge Deller (deller@gmx.de)
*
*/
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/gfp.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */
#include <linux/initrd.h>
#include <linux/swap.h>
#include <linux/unistd.h>
#include <linux/nodemask.h> /* for node_online_map */
#include <linux/pagemap.h> /* for release_pages */
#include <linux/compat.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <asm/pdc_chassis.h>
#include <asm/mmzone.h>
#include <asm/sections.h>
#include <asm/msgbuf.h>
extern int data_start;
extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
#if CONFIG_PGTABLE_LEVELS == 3
/* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
* with the first pmd adjacent to the pgd and below it. gcc doesn't actually
* guarantee that global objects will be laid out in memory in the same order
* as the order of declaration, so put these in different sections and use
* the linker script to order them. */
pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
#endif
pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
#ifdef CONFIG_DISCONTIGMEM
struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
#endif
static struct resource data_resource = {
.name = "Kernel data",
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
};
static struct resource code_resource = {
.name = "Kernel code",
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
};
static struct resource pdcdata_resource = {
.name = "PDC data (Page Zero)",
.start = 0,
.end = 0x9ff,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};
static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
/* The following array is initialized from the firmware specific
* information retrieved in kernel/inventory.c.
*/
physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
int npmem_ranges __read_mostly;
/*
* get_memblock() allocates pages via memblock.
* We can't use memblock_find_in_range(0, KERNEL_INITIAL_SIZE) here since it
* doesn't allocate from bottom to top which is needed because we only created
* the initial mapping up to KERNEL_INITIAL_SIZE in the assembly bootup code.
*/
static void * __init get_memblock(unsigned long size)
{
static phys_addr_t search_addr __initdata;
phys_addr_t phys;
if (!search_addr)
search_addr = PAGE_ALIGN(__pa((unsigned long) &_end));
search_addr = ALIGN(search_addr, size);
while (!memblock_is_region_memory(search_addr, size) ||
memblock_is_region_reserved(search_addr, size)) {
search_addr += size;
}
phys = search_addr;
if (phys)
memblock_reserve(phys, size);
else
panic("get_memblock() failed.\n");
memset(__va(phys), 0, size);
return __va(phys);
}
#ifdef CONFIG_64BIT
#define MAX_MEM (~0UL)
#else /* !CONFIG_64BIT */
#define MAX_MEM (3584U*1024U*1024U)
#endif /* !CONFIG_64BIT */
static unsigned long mem_limit __read_mostly = MAX_MEM;
static void __init mem_limit_func(void)
{
char *cp, *end;
unsigned long limit;
/* We need this before __setup() functions are called */
limit = MAX_MEM;
for (cp = boot_command_line; *cp; ) {
if (memcmp(cp, "mem=", 4) == 0) {
cp += 4;
limit = memparse(cp, &end);
if (end != cp)
break;
cp = end;
} else {
while (*cp != ' ' && *cp)
++cp;
while (*cp == ' ')
++cp;
}
}
if (limit < mem_limit)
mem_limit = limit;
}
#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
static void __init setup_bootmem(void)
{
unsigned long mem_max;
#ifndef CONFIG_DISCONTIGMEM
physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
int npmem_holes;
#endif
int i, sysram_resource_count;
disable_sr_hashing(); /* Turn off space register hashing */
/*
* Sort the ranges. Since the number of ranges is typically
* small, and performance is not an issue here, just do
* a simple insertion sort.
*/
for (i = 1; i < npmem_ranges; i++) {
int j;
for (j = i; j > 0; j--) {
unsigned long tmp;
if (pmem_ranges[j-1].start_pfn <
pmem_ranges[j].start_pfn) {
break;
}
tmp = pmem_ranges[j-1].start_pfn;
pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
pmem_ranges[j].start_pfn = tmp;
tmp = pmem_ranges[j-1].pages;
pmem_ranges[j-1].pages = pmem_ranges[j].pages;
pmem_ranges[j].pages = tmp;
}
}
#ifndef CONFIG_DISCONTIGMEM
/*
* Throw out ranges that are too far apart (controlled by
* MAX_GAP).
*/
for (i = 1; i < npmem_ranges; i++) {
if (pmem_ranges[i].start_pfn -
(pmem_ranges[i-1].start_pfn +
pmem_ranges[i-1].pages) > MAX_GAP) {
npmem_ranges = i;
printk("Large gap in memory detected (%ld pages). "
"Consider turning on CONFIG_DISCONTIGMEM\n",
pmem_ranges[i].start_pfn -
(pmem_ranges[i-1].start_pfn +
pmem_ranges[i-1].pages));
break;
}
}
#endif
/* Print the memory ranges */
pr_info("Memory Ranges:\n");
for (i = 0; i < npmem_ranges; i++) {
struct resource *res = &sysram_resources[i];
unsigned long start;
unsigned long size;
size = (pmem_ranges[i].pages << PAGE_SHIFT);
start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
i, start, start + (size - 1), size >> 20);
/* request memory resource */
res->name = "System RAM";
res->start = start;
res->end = start + size - 1;
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
request_resource(&iomem_resource, res);
}
sysram_resource_count = npmem_ranges;
/*
* For 32 bit kernels we limit the amount of memory we can
* support, in order to preserve enough kernel address space
* for other purposes. For 64 bit kernels we don't normally
* limit the memory, but this mechanism can be used to
* artificially limit the amount of memory (and it is written
* to work with multiple memory ranges).
*/
mem_limit_func(); /* check for "mem=" argument */
mem_max = 0;
for (i = 0; i < npmem_ranges; i++) {
unsigned long rsize;
rsize = pmem_ranges[i].pages << PAGE_SHIFT;
if ((mem_max + rsize) > mem_limit) {
printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
if (mem_max == mem_limit)
npmem_ranges = i;
else {
pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
- (mem_max >> PAGE_SHIFT);
npmem_ranges = i + 1;
mem_max = mem_limit;
}
break;
}
mem_max += rsize;
}
printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
#ifndef CONFIG_DISCONTIGMEM
/* Merge the ranges, keeping track of the holes */
{
unsigned long end_pfn;
unsigned long hole_pages;
npmem_holes = 0;
end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
for (i = 1; i < npmem_ranges; i++) {
hole_pages = pmem_ranges[i].start_pfn - end_pfn;
if (hole_pages) {
pmem_holes[npmem_holes].start_pfn = end_pfn;
pmem_holes[npmem_holes++].pages = hole_pages;
end_pfn += hole_pages;
}
end_pfn += pmem_ranges[i].pages;
}
pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
npmem_ranges = 1;
}
#endif
#ifdef CONFIG_DISCONTIGMEM
for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
memset(NODE_DATA(i), 0, sizeof(pg_data_t));
}
memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
for (i = 0; i < npmem_ranges; i++) {
node_set_state(i, N_NORMAL_MEMORY);
node_set_online(i);
}
#endif
/*
* Initialize and free the full range of memory in each range.
*/
max_pfn = 0;
for (i = 0; i < npmem_ranges; i++) {
unsigned long start_pfn;
unsigned long npages;
unsigned long start;
unsigned long size;
start_pfn = pmem_ranges[i].start_pfn;
npages = pmem_ranges[i].pages;
start = start_pfn << PAGE_SHIFT;
size = npages << PAGE_SHIFT;
/* add system RAM memblock */
memblock_add(start, size);
if ((start_pfn + npages) > max_pfn)
max_pfn = start_pfn + npages;
}
/* IOMMU is always used to access "high mem" on those boxes
* that can support enough mem that a PCI device couldn't
* directly DMA to any physical addresses.
* ISA DMA support will need to revisit this.
*/
max_low_pfn = max_pfn;
/* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
#define PDC_CONSOLE_IO_IODC_SIZE 32768
memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
PDC_CONSOLE_IO_IODC_SIZE));
memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
(unsigned long)(_end - KERNEL_BINARY_TEXT_START));
#ifndef CONFIG_DISCONTIGMEM
/* reserve the holes */
for (i = 0; i < npmem_holes; i++) {
memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
(pmem_holes[i].pages << PAGE_SHIFT));
}
#endif
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
if (__pa(initrd_start) < mem_max) {
unsigned long initrd_reserve;
if (__pa(initrd_end) > mem_max) {
initrd_reserve = mem_max - __pa(initrd_start);
} else {
initrd_reserve = initrd_end - initrd_start;
}
initrd_below_start_ok = 1;
printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
memblock_reserve(__pa(initrd_start), initrd_reserve);
}
}
#endif
data_resource.start = virt_to_phys(&data_start);
data_resource.end = virt_to_phys(_end) - 1;
code_resource.start = virt_to_phys(_text);
code_resource.end = virt_to_phys(&data_start)-1;
/* We don't know which region the kernel will be in, so try
* all of them.
*/
for (i = 0; i < sysram_resource_count; i++) {
struct resource *res = &sysram_resources[i];
request_resource(res, &code_resource);
request_resource(res, &data_resource);
}
request_resource(&sysram_resources[0], &pdcdata_resource);
/* Initialize Page Deallocation Table (PDT) and check for bad memory. */
pdc_pdt_init();
}
static int __init parisc_text_address(unsigned long vaddr)
{
static unsigned long head_ptr __initdata;
if (!head_ptr)
head_ptr = PAGE_MASK & (unsigned long)
dereference_function_descriptor(&parisc_kernel_start);
return core_kernel_text(vaddr) || vaddr == head_ptr;
}
static void __init map_pages(unsigned long start_vaddr,
unsigned long start_paddr, unsigned long size,
pgprot_t pgprot, int force)
{
pgd_t *pg_dir;
pmd_t *pmd;
pte_t *pg_table;
unsigned long end_paddr;
unsigned long start_pmd;
unsigned long start_pte;
unsigned long tmp1;
unsigned long tmp2;
unsigned long address;
unsigned long vaddr;
unsigned long ro_start;
unsigned long ro_end;
unsigned long kernel_end;
ro_start = __pa((unsigned long)_text);
ro_end = __pa((unsigned long)&data_start);
kernel_end = __pa((unsigned long)&_end);
end_paddr = start_paddr + size;
pg_dir = pgd_offset_k(start_vaddr);
#if PTRS_PER_PMD == 1
start_pmd = 0;
#else
start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
#endif
start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
address = start_paddr;
vaddr = start_vaddr;
while (address < end_paddr) {
#if PTRS_PER_PMD == 1
pmd = (pmd_t *)__pa(pg_dir);
#else
pmd = (pmd_t *)pgd_address(*pg_dir);
/*
* pmd is physical at this point
*/
if (!pmd) {
pmd = (pmd_t *) get_memblock(PAGE_SIZE << PMD_ORDER);
pmd = (pmd_t *) __pa(pmd);
}
pgd_populate(NULL, pg_dir, __va(pmd));
#endif
pg_dir++;
/* now change pmd to kernel virtual addresses */
pmd = (pmd_t *)__va(pmd) + start_pmd;
for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
/*
* pg_table is physical at this point
*/
pg_table = (pte_t *)pmd_address(*pmd);
if (!pg_table) {
pg_table = (pte_t *) get_memblock(PAGE_SIZE);
pg_table = (pte_t *) __pa(pg_table);
}
pmd_populate_kernel(NULL, pmd, __va(pg_table));
/* now change pg_table to kernel virtual addresses */
pg_table = (pte_t *) __va(pg_table) + start_pte;
for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
pte_t pte;
if (force)
pte = __mk_pte(address, pgprot);
else if (parisc_text_address(vaddr)) {
pte = __mk_pte(address, PAGE_KERNEL_EXEC);
if (address >= ro_start && address < kernel_end)
pte = pte_mkhuge(pte);
}
else
#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
if (address >= ro_start && address < ro_end) {
pte = __mk_pte(address, PAGE_KERNEL_EXEC);
pte = pte_mkhuge(pte);
} else
#endif
{
pte = __mk_pte(address, pgprot);
if (address >= ro_start && address < kernel_end)
pte = pte_mkhuge(pte);
}
if (address >= end_paddr) {
if (force)
break;
else
pte_val(pte) = 0;
}
set_pte(pg_table, pte);
address += PAGE_SIZE;
vaddr += PAGE_SIZE;
}
start_pte = 0;
if (address >= end_paddr)
break;
}
start_pmd = 0;
}
}
void free_initmem(void)
{
unsigned long init_begin = (unsigned long)__init_begin;
unsigned long init_end = (unsigned long)__init_end;
/* The init text pages are marked R-X. We have to
* flush the icache and mark them RW-
*
* This is tricky, because map_pages is in the init section.
* Do a dummy remap of the data section first (the data
* section is already PAGE_KERNEL) to pull in the TLB entries
* for map_kernel */
map_pages(init_begin, __pa(init_begin), init_end - init_begin,
PAGE_KERNEL_RWX, 1);
/* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
* map_pages */
map_pages(init_begin, __pa(init_begin), init_end - init_begin,
PAGE_KERNEL, 1);
/* force the kernel to see the new TLB entries */
__flush_tlb_range(0, init_begin, init_end);
/* finally dump all the instructions which were cached, since the
* pages are no-longer executable */
flush_icache_range(init_begin, init_end);
free_initmem_default(POISON_FREE_INITMEM);
/* set up a new led state on systems shipped LED State panel */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
/* rodata memory was already mapped with KERNEL_RO access rights by
pagetable_init() and map_pages(). No need to do additional stuff here */
printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(unsigned long)(__end_rodata - __start_rodata) >> 10);
}
#endif
/*
* Just an arbitrary offset to serve as a "hole" between mapping areas
* (between top of physical memory and a potential pcxl dma mapping
* area, and below the vmalloc mapping area).
*
* The current 32K value just means that there will be a 32K "hole"
* between mapping areas. That means that any out-of-bounds memory
* accesses will hopefully be caught. The vmalloc() routines leaves
* a hole of 4kB between each vmalloced area for the same reason.
*/
/* Leave room for gateway page expansion */
#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
#error KERNEL_MAP_START is in gateway reserved region
#endif
#define MAP_START (KERNEL_MAP_START)
#define VM_MAP_OFFSET (32*1024)
#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
& ~(VM_MAP_OFFSET-1)))
void *parisc_vmalloc_start __read_mostly;
EXPORT_SYMBOL(parisc_vmalloc_start);
#ifdef CONFIG_PA11
unsigned long pcxl_dma_start __read_mostly;
#endif
void __init mem_init(void)
{
/* Do sanity checks on IPC (compat) structures */
BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
#ifndef CONFIG_64BIT
BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
#endif
#ifdef CONFIG_COMPAT
BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
#endif
/* Do sanity checks on page table constants */
BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
> BITS_PER_LONG);
high_memory = __va((max_pfn << PAGE_SHIFT));
set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1);
free_all_bootmem();
#ifdef CONFIG_PA11
if (hppa_dma_ops == &pcxl_dma_ops) {
pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
+ PCXL_DMA_MAP_SIZE);
} else {
pcxl_dma_start = 0;
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
}
#else
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
#endif
mem_init_print_info(NULL);
#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
printk("virtual kernel memory layout:\n"
" vmalloc : 0x%p - 0x%p (%4ld MB)\n"
" memory : 0x%p - 0x%p (%4ld MB)\n"
" .init : 0x%p - 0x%p (%4ld kB)\n"
" .data : 0x%p - 0x%p (%4ld kB)\n"
" .text : 0x%p - 0x%p (%4ld kB)\n",
(void*)VMALLOC_START, (void*)VMALLOC_END,
(VMALLOC_END - VMALLOC_START) >> 20,
__va(0), high_memory,
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
__init_begin, __init_end,
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
_etext, _edata,
((unsigned long)_edata - (unsigned long)_etext) >> 10,
_text, _etext,
((unsigned long)_etext - (unsigned long)_text) >> 10);
#endif
}
unsigned long *empty_zero_page __read_mostly;
EXPORT_SYMBOL(empty_zero_page);
/*
* pagetable_init() sets up the page tables
*
* Note that gateway_init() places the Linux gateway page at page 0.
* Since gateway pages cannot be dereferenced this has the desirable
* side effect of trapping those pesky NULL-reference errors in the
* kernel.
*/
static void __init pagetable_init(void)
{
int range;
/* Map each physical memory range to its kernel vaddr */
for (range = 0; range < npmem_ranges; range++) {
unsigned long start_paddr;
unsigned long end_paddr;
unsigned long size;
start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
size = pmem_ranges[range].pages << PAGE_SHIFT;
end_paddr = start_paddr + size;
map_pages((unsigned long)__va(start_paddr), start_paddr,
size, PAGE_KERNEL, 0);
}
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_end && initrd_end > mem_limit) {
printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
map_pages(initrd_start, __pa(initrd_start),
initrd_end - initrd_start, PAGE_KERNEL, 0);
}
#endif
empty_zero_page = get_memblock(PAGE_SIZE);
}
static void __init gateway_init(void)
{
unsigned long linux_gateway_page_addr;
/* FIXME: This is 'const' in order to trick the compiler
into not treating it as DP-relative data. */
extern void * const linux_gateway_page;
linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
/*
* Setup Linux Gateway page.
*
* The Linux gateway page will reside in kernel space (on virtual
* page 0), so it doesn't need to be aliased into user space.
*/
map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
PAGE_SIZE, PAGE_GATEWAY, 1);
}
void __init paging_init(void)
{
int i;
setup_bootmem();
pagetable_init();
gateway_init();
flush_cache_all_local(); /* start with known state */
flush_tlb_all_local(NULL);
for (i = 0; i < npmem_ranges; i++) {
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
#ifdef CONFIG_DISCONTIGMEM
/* Need to initialize the pfnnid_map before we can initialize
the zone */
{
int j;
for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
j++) {
pfnnid_map[j] = i;
}
}
#endif
free_area_init_node(i, zones_size,
pmem_ranges[i].start_pfn, NULL);
}
}
#ifdef CONFIG_PA20
/*
* Currently, all PA20 chips have 18 bit protection IDs, which is the
* limiting factor (space ids are 32 bits).
*/
#define NR_SPACE_IDS 262144
#else
/*
* Currently we have a one-to-one relationship between space IDs and
* protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
* support 15 bit protection IDs, so that is the limiting factor.
* PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
* probably not worth the effort for a special case here.
*/
#define NR_SPACE_IDS 32768
#endif /* !CONFIG_PA20 */
#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
static unsigned long dirty_space_id[SID_ARRAY_SIZE];
static unsigned long space_id_index;
static unsigned long free_space_ids = NR_SPACE_IDS - 1;
static unsigned long dirty_space_ids = 0;
static DEFINE_SPINLOCK(sid_lock);
unsigned long alloc_sid(void)
{
unsigned long index;
spin_lock(&sid_lock);
if (free_space_ids == 0) {
if (dirty_space_ids != 0) {
spin_unlock(&sid_lock);
flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
spin_lock(&sid_lock);
}
BUG_ON(free_space_ids == 0);
}
free_space_ids--;
index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
space_id_index = index;
spin_unlock(&sid_lock);
return index << SPACEID_SHIFT;
}
void free_sid(unsigned long spaceid)
{
unsigned long index = spaceid >> SPACEID_SHIFT;
unsigned long *dirty_space_offset;
dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
index &= (BITS_PER_LONG - 1);
spin_lock(&sid_lock);
BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
*dirty_space_offset |= (1L << index);
dirty_space_ids++;
spin_unlock(&sid_lock);
}
#ifdef CONFIG_SMP
static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
{
int i;
/* NOTE: sid_lock must be held upon entry */
*ndirtyptr = dirty_space_ids;
if (dirty_space_ids != 0) {
for (i = 0; i < SID_ARRAY_SIZE; i++) {
dirty_array[i] = dirty_space_id[i];
dirty_space_id[i] = 0;
}
dirty_space_ids = 0;
}
return;
}
static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
{
int i;
/* NOTE: sid_lock must be held upon entry */
if (ndirty != 0) {
for (i = 0; i < SID_ARRAY_SIZE; i++) {
space_id[i] ^= dirty_array[i];
}
free_space_ids += ndirty;
space_id_index = 0;
}
}
#else /* CONFIG_SMP */
static void recycle_sids(void)
{
int i;
/* NOTE: sid_lock must be held upon entry */
if (dirty_space_ids != 0) {
for (i = 0; i < SID_ARRAY_SIZE; i++) {
space_id[i] ^= dirty_space_id[i];
dirty_space_id[i] = 0;
}
free_space_ids += dirty_space_ids;
dirty_space_ids = 0;
space_id_index = 0;
}
}
#endif
/*
* flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
* purged, we can safely reuse the space ids that were released but
* not flushed from the tlb.
*/
#ifdef CONFIG_SMP
static unsigned long recycle_ndirty;
static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
static unsigned int recycle_inuse;
void flush_tlb_all(void)
{
int do_recycle;
__inc_irq_stat(irq_tlb_count);
do_recycle = 0;
spin_lock(&sid_lock);
if (dirty_space_ids > RECYCLE_THRESHOLD) {
BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
recycle_inuse++;
do_recycle++;
}
spin_unlock(&sid_lock);
on_each_cpu(flush_tlb_all_local, NULL, 1);
if (do_recycle) {
spin_lock(&sid_lock);
recycle_sids(recycle_ndirty,recycle_dirty_array);
recycle_inuse = 0;
spin_unlock(&sid_lock);
}
}
#else
void flush_tlb_all(void)
{
__inc_irq_stat(irq_tlb_count);
spin_lock(&sid_lock);
flush_tlb_all_local(NULL);
recycle_sids();
spin_unlock(&sid_lock);
}
#endif
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
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