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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-08-20 17:07:17 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2019-08-27 06:03:35 +0300
commitf381d5711f091facd8847a54a2377cc0d1519df2 (patch)
treec187a3aa9f280cafa727be14d92406682ba972a0 /arch/powerpc/mm/pgtable_64.c
parent7cd9b317b630683b0c8eb2dfcfb046003ad6b97b (diff)
downloadlinux-f381d5711f091facd8847a54a2377cc0d1519df2.tar.xz
powerpc/mm: Move ioremap functions out of pgtable_32/64.c
Create ioremap_32.c and ioremap_64.c and move respective ioremap functions out of pgtable_32.c and pgtable_64.c In the meantime, fix a few comments and changes a printk() to pr_warn(). Also fix a few oversplitted lines. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b5c8b02ccefd4ede64c61b53cf64fb5dacb35740.1566309263.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
-rw-r--r--arch/powerpc/mm/pgtable_64.c128
1 files changed, 1 insertions, 127 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index d865e053052d..e78832dce7bb 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * This file contains ioremap and related functions for 64-bit machines.
+ * This file contains pgtable related functions for 64-bit machines.
*
* Derived from arch/ppc64/mm/init.c
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
@@ -34,7 +34,6 @@
#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/prom.h>
-#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
@@ -100,131 +99,6 @@ unsigned long __pte_frag_size_shift;
EXPORT_SYMBOL(__pte_frag_size_shift);
#endif
-int __weak ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid)
-{
- unsigned long i;
-
- for (i = 0; i < size; i += PAGE_SIZE) {
- int err = map_kernel_page(ea + i, pa + i, prot);
- if (err) {
- if (slab_is_available())
- unmap_kernel_range(ea, size);
- else
- WARN_ON_ONCE(1); /* Should clean up */
- return err;
- }
- }
-
- return 0;
-}
-
-/**
- * __ioremap_at - Low level function to establish the page tables
- * for an IO mapping
- */
-void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot)
-{
- /* We don't support the 4K PFN hack with ioremap */
- if (pgprot_val(prot) & H_PAGE_4K_PFN)
- return NULL;
-
- if ((ea + size) >= (void *)IOREMAP_END) {
- pr_warn("Outside the supported range\n");
- return NULL;
- }
-
- WARN_ON(pa & ~PAGE_MASK);
- WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
- WARN_ON(size & ~PAGE_MASK);
-
- if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))
- return NULL;
-
- return (void __iomem *)ea;
-}
-
-/**
- * __iounmap_from - Low level function to tear down the page tables
- * for an IO mapping. This is used for mappings that
- * are manipulated manually, like partial unmapping of
- * PCI IOs or ISA space.
- */
-void __iounmap_at(void *ea, unsigned long size)
-{
- WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
- WARN_ON(size & ~PAGE_MASK);
-
- unmap_kernel_range((unsigned long)ea, size);
-}
-
-void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size,
- pgprot_t prot, void *caller)
-{
- phys_addr_t paligned;
- 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
- *
- */
- paligned = addr & PAGE_MASK;
- size = PAGE_ALIGN(addr + size) - paligned;
-
- if ((size == 0) || (paligned == 0))
- return NULL;
-
- if (slab_is_available()) {
- struct vm_struct *area;
-
- area = __get_vm_area_caller(size, VM_IOREMAP,
- ioremap_bot, IOREMAP_END,
- caller);
- if (area == NULL)
- return NULL;
-
- area->phys_addr = paligned;
- ret = __ioremap_at(paligned, area->addr, size, prot);
- } else {
- ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot);
- if (ret)
- ioremap_bot += size;
- }
-
- if (ret)
- ret += addr & ~PAGE_MASK;
- return ret;
-}
-
-/*
- * Unmap an IO region and remove it from imalloc'd list.
- * Access to IO memory should be serialized by driver.
- */
-void iounmap(volatile void __iomem *token)
-{
- void *addr;
-
- if (!slab_is_available())
- return;
-
- addr = (void *) ((unsigned long __force)
- PCI_FIX_ADDR(token) & PAGE_MASK);
- if ((unsigned long)addr < ioremap_bot) {
- printk(KERN_WARNING "Attempt to iounmap early bolted mapping"
- " at 0x%p\n", addr);
- return;
- }
- vunmap(addr);
-}
-
-EXPORT_SYMBOL(__ioremap_at);
-EXPORT_SYMBOL(iounmap);
-EXPORT_SYMBOL(__iounmap_at);
-
#ifndef __PAGETABLE_PUD_FOLDED
/* 4 level page table */
struct page *pgd_page(pgd_t pgd)