c19c03fc74
This makes unmap_vm_area static and a wrapper around a new exported unmap_kernel_range that takes an explicit range instead of a vm_area struct. This makes it more versatile for code that wants to play with kernel page tables outside of the standard vmalloc area. (One example is some rework of the PowerPC PCI IO space mapping code that depends on that patch and removes some code duplication and horrible abuse of forged struct vm_struct). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
340 lines
8.0 KiB
C
340 lines
8.0 KiB
C
/*
|
|
* This file contains ioremap and related functions for 64-bit machines.
|
|
*
|
|
* Derived from arch/ppc64/mm/init.c
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
|
|
* 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/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/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/firmware.h>
|
|
|
|
#include "mmu_decl.h"
|
|
|
|
unsigned long ioremap_bot = IMALLOC_BASE;
|
|
static unsigned long phbs_io_bot = PHBS_IO_BASE;
|
|
|
|
/*
|
|
* map_io_page currently only called by __ioremap
|
|
* map_io_page adds an entry to the ioremap page table
|
|
* and adds an entry to the HPT, possibly bolting it
|
|
*/
|
|
static int map_io_page(unsigned long ea, unsigned long pa, int flags)
|
|
{
|
|
pgd_t *pgdp;
|
|
pud_t *pudp;
|
|
pmd_t *pmdp;
|
|
pte_t *ptep;
|
|
|
|
if (mem_init_done) {
|
|
pgdp = pgd_offset_k(ea);
|
|
pudp = pud_alloc(&init_mm, pgdp, ea);
|
|
if (!pudp)
|
|
return -ENOMEM;
|
|
pmdp = pmd_alloc(&init_mm, pudp, ea);
|
|
if (!pmdp)
|
|
return -ENOMEM;
|
|
ptep = pte_alloc_kernel(pmdp, ea);
|
|
if (!ptep)
|
|
return -ENOMEM;
|
|
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
|
|
__pgprot(flags)));
|
|
} else {
|
|
/*
|
|
* If the mm subsystem is not fully up, we cannot create a
|
|
* linux page table entry for this mapping. Simply bolt an
|
|
* entry in the hardware page table.
|
|
*
|
|
*/
|
|
if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
|
|
mmu_io_psize)) {
|
|
printk(KERN_ERR "Failed to do bolted mapping IO "
|
|
"memory at %016lx !\n", pa);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void __iomem * __ioremap_com(phys_addr_t addr, unsigned long pa,
|
|
unsigned long ea, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long i;
|
|
|
|
if ((flags & _PAGE_PRESENT) == 0)
|
|
flags |= pgprot_val(PAGE_KERNEL);
|
|
|
|
for (i = 0; i < size; i += PAGE_SIZE)
|
|
if (map_io_page(ea+i, pa+i, flags))
|
|
return NULL;
|
|
|
|
return (void __iomem *) (ea + (addr & ~PAGE_MASK));
|
|
}
|
|
|
|
void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long pa, ea;
|
|
void __iomem *ret;
|
|
|
|
/*
|
|
* Choose an address to map it to.
|
|
* Once the imalloc system is running, we use it.
|
|
* Before that, we map using addresses going
|
|
* up from ioremap_bot. imalloc will use
|
|
* the addresses from ioremap_bot through
|
|
* IMALLOC_END
|
|
*
|
|
*/
|
|
pa = addr & PAGE_MASK;
|
|
size = PAGE_ALIGN(addr + size) - pa;
|
|
|
|
if ((size == 0) || (pa == 0))
|
|
return NULL;
|
|
|
|
if (mem_init_done) {
|
|
struct vm_struct *area;
|
|
area = im_get_free_area(size);
|
|
if (area == NULL)
|
|
return NULL;
|
|
ea = (unsigned long)(area->addr);
|
|
ret = __ioremap_com(addr, pa, ea, size, flags);
|
|
if (!ret)
|
|
im_free(area->addr);
|
|
} else {
|
|
ea = ioremap_bot;
|
|
ret = __ioremap_com(addr, pa, ea, size, flags);
|
|
if (ret)
|
|
ioremap_bot += size;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
void __iomem * ioremap(phys_addr_t addr, unsigned long size)
|
|
{
|
|
unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED;
|
|
|
|
if (ppc_md.ioremap)
|
|
return ppc_md.ioremap(addr, size, flags);
|
|
return __ioremap(addr, size, flags);
|
|
}
|
|
|
|
void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
if (ppc_md.ioremap)
|
|
return ppc_md.ioremap(addr, size, flags);
|
|
return __ioremap(addr, size, flags);
|
|
}
|
|
|
|
|
|
#define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
|
|
|
|
int __ioremap_explicit(phys_addr_t pa, unsigned long ea,
|
|
unsigned long size, unsigned long flags)
|
|
{
|
|
struct vm_struct *area;
|
|
void __iomem *ret;
|
|
|
|
/* For now, require page-aligned values for pa, ea, and size */
|
|
if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
|
|
!IS_PAGE_ALIGNED(size)) {
|
|
printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
|
|
return 1;
|
|
}
|
|
|
|
if (!mem_init_done) {
|
|
/* Two things to consider in this case:
|
|
* 1) No records will be kept (imalloc, etc) that the region
|
|
* has been remapped
|
|
* 2) It won't be easy to iounmap() the region later (because
|
|
* of 1)
|
|
*/
|
|
;
|
|
} else {
|
|
area = im_get_area(ea, size,
|
|
IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
|
|
if (area == NULL) {
|
|
/* Expected when PHB-dlpar is in play */
|
|
return 1;
|
|
}
|
|
if (ea != (unsigned long) area->addr) {
|
|
printk(KERN_ERR "unexpected addr return from "
|
|
"im_get_area\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
ret = __ioremap_com(pa, pa, ea, size, flags);
|
|
if (ret == NULL) {
|
|
printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
|
|
return 1;
|
|
}
|
|
if (ret != (void *) ea) {
|
|
printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unmap an IO region and remove it from imalloc'd list.
|
|
* Access to IO memory should be serialized by driver.
|
|
*
|
|
* XXX what about calls before mem_init_done (ie python_countermeasures())
|
|
*/
|
|
void __iounmap(volatile void __iomem *token)
|
|
{
|
|
void *addr;
|
|
|
|
if (!mem_init_done)
|
|
return;
|
|
|
|
addr = (void *) ((unsigned long __force) token & PAGE_MASK);
|
|
|
|
im_free(addr);
|
|
}
|
|
|
|
void iounmap(volatile void __iomem *token)
|
|
{
|
|
if (ppc_md.iounmap)
|
|
ppc_md.iounmap(token);
|
|
else
|
|
__iounmap(token);
|
|
}
|
|
|
|
static int iounmap_subset_regions(unsigned long addr, unsigned long size)
|
|
{
|
|
struct vm_struct *area;
|
|
|
|
/* Check whether subsets of this region exist */
|
|
area = im_get_area(addr, size, IM_REGION_SUPERSET);
|
|
if (area == NULL)
|
|
return 1;
|
|
|
|
while (area) {
|
|
iounmap((void __iomem *) area->addr);
|
|
area = im_get_area(addr, size,
|
|
IM_REGION_SUPERSET);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __iounmap_explicit(volatile void __iomem *start, unsigned long size)
|
|
{
|
|
struct vm_struct *area;
|
|
unsigned long addr;
|
|
int rc;
|
|
|
|
addr = (unsigned long __force) start & PAGE_MASK;
|
|
|
|
/* Verify that the region either exists or is a subset of an existing
|
|
* region. In the latter case, split the parent region to create
|
|
* the exact region
|
|
*/
|
|
area = im_get_area(addr, size,
|
|
IM_REGION_EXISTS | IM_REGION_SUBSET);
|
|
if (area == NULL) {
|
|
/* Determine whether subset regions exist. If so, unmap */
|
|
rc = iounmap_subset_regions(addr, size);
|
|
if (rc) {
|
|
printk(KERN_ERR
|
|
"%s() cannot unmap nonexistent range 0x%lx\n",
|
|
__FUNCTION__, addr);
|
|
return 1;
|
|
}
|
|
} else {
|
|
iounmap((void __iomem *) area->addr);
|
|
}
|
|
/*
|
|
* FIXME! This can't be right:
|
|
iounmap(area->addr);
|
|
* Maybe it should be "iounmap(area);"
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ioremap);
|
|
EXPORT_SYMBOL(ioremap_flags);
|
|
EXPORT_SYMBOL(__ioremap);
|
|
EXPORT_SYMBOL(iounmap);
|
|
EXPORT_SYMBOL(__iounmap);
|
|
|
|
static DEFINE_SPINLOCK(phb_io_lock);
|
|
|
|
void __iomem * reserve_phb_iospace(unsigned long size)
|
|
{
|
|
void __iomem *virt_addr;
|
|
|
|
if (phbs_io_bot >= IMALLOC_BASE)
|
|
panic("reserve_phb_iospace(): phb io space overflow\n");
|
|
|
|
spin_lock(&phb_io_lock);
|
|
virt_addr = (void __iomem *) phbs_io_bot;
|
|
phbs_io_bot += size;
|
|
spin_unlock(&phb_io_lock);
|
|
|
|
return virt_addr;
|
|
}
|