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authorMike Rapoport <rppt@linux.ibm.com>2020-08-07 09:22:51 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 21:33:26 +0300
commitab05eabfa18a6a537a73408642177e4a803317dc (patch)
treef9e7194dcbeaea2850fec2301e473597ae89ac07 /lib
parentf9cb654cb550b7b87e8608b14fc3eca432429ffe (diff)
downloadlinux-ab05eabfa18a6a537a73408642177e4a803317dc.tar.xz
mm: move lib/ioremap.c to mm/
The functionality in lib/ioremap.c deals with pagetables, vmalloc and caches, so it naturally belongs to mm/ Moving it there will also allow declaring p?d_alloc_track functions in an header file inside mm/ rather than having those declarations in include/linux/mm.h Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Pekka Enberg <penberg@kernel.org> Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Joerg Roedel <joro@8bytes.org> Cc: Joerg Roedel <jroedel@suse.de> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com> Cc: Stafford Horne <shorne@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Matthew Wilcox <willy@infradead.org> Link: http://lkml.kernel.org/r/20200627143453.31835-8-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile1
-rw-r--r--lib/ioremap.c287
2 files changed, 0 insertions, 288 deletions
diff --git a/lib/Makefile b/lib/Makefile
index 435f7f13b8aa..f39962104036 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -37,7 +37,6 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o
lib-$(CONFIG_PRINTK) += dump_stack.o
-lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
lib-y += kobject.o klist.o
diff --git a/lib/ioremap.c b/lib/ioremap.c
deleted file mode 100644
index 5ee3526f71b8..000000000000
--- a/lib/ioremap.c
+++ /dev/null
@@ -1,287 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Re-map IO memory to kernel address space so that we can access it.
- * This is needed for high PCI addresses that aren't mapped in the
- * 640k-1MB IO memory area on PC's
- *
- * (C) Copyright 1995 1996 Linus Torvalds
- */
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/io.h>
-#include <linux/export.h>
-#include <asm/cacheflush.h>
-
-#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
-static int __read_mostly ioremap_p4d_capable;
-static int __read_mostly ioremap_pud_capable;
-static int __read_mostly ioremap_pmd_capable;
-static int __read_mostly ioremap_huge_disabled;
-
-static int __init set_nohugeiomap(char *str)
-{
- ioremap_huge_disabled = 1;
- return 0;
-}
-early_param("nohugeiomap", set_nohugeiomap);
-
-void __init ioremap_huge_init(void)
-{
- if (!ioremap_huge_disabled) {
- if (arch_ioremap_p4d_supported())
- ioremap_p4d_capable = 1;
- if (arch_ioremap_pud_supported())
- ioremap_pud_capable = 1;
- if (arch_ioremap_pmd_supported())
- ioremap_pmd_capable = 1;
- }
-}
-
-static inline int ioremap_p4d_enabled(void)
-{
- return ioremap_p4d_capable;
-}
-
-static inline int ioremap_pud_enabled(void)
-{
- return ioremap_pud_capable;
-}
-
-static inline int ioremap_pmd_enabled(void)
-{
- return ioremap_pmd_capable;
-}
-
-#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
-static inline int ioremap_p4d_enabled(void) { return 0; }
-static inline int ioremap_pud_enabled(void) { return 0; }
-static inline int ioremap_pmd_enabled(void) { return 0; }
-#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
-
-static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pte_t *pte;
- u64 pfn;
-
- pfn = phys_addr >> PAGE_SHIFT;
- pte = pte_alloc_kernel_track(pmd, addr, mask);
- if (!pte)
- return -ENOMEM;
- do {
- BUG_ON(!pte_none(*pte));
- set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
- pfn++;
- } while (pte++, addr += PAGE_SIZE, addr != end);
- *mask |= PGTBL_PTE_MODIFIED;
- return 0;
-}
-
-static int ioremap_try_huge_pmd(pmd_t *pmd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_pmd_enabled())
- return 0;
-
- if ((end - addr) != PMD_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, PMD_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, PMD_SIZE))
- return 0;
-
- if (pmd_present(*pmd) && !pmd_free_pte_page(pmd, addr))
- return 0;
-
- return pmd_set_huge(pmd, phys_addr, prot);
-}
-
-static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pmd_t *pmd;
- unsigned long next;
-
- pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
- if (!pmd)
- return -ENOMEM;
- do {
- next = pmd_addr_end(addr, end);
-
- if (ioremap_try_huge_pmd(pmd, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_PMD_MODIFIED;
- continue;
- }
-
- if (ioremap_pte_range(pmd, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (pmd++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
-static int ioremap_try_huge_pud(pud_t *pud, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_pud_enabled())
- return 0;
-
- if ((end - addr) != PUD_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, PUD_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, PUD_SIZE))
- return 0;
-
- if (pud_present(*pud) && !pud_free_pmd_page(pud, addr))
- return 0;
-
- return pud_set_huge(pud, phys_addr, prot);
-}
-
-static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- pud_t *pud;
- unsigned long next;
-
- pud = pud_alloc_track(&init_mm, p4d, addr, mask);
- if (!pud)
- return -ENOMEM;
- do {
- next = pud_addr_end(addr, end);
-
- if (ioremap_try_huge_pud(pud, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_PUD_MODIFIED;
- continue;
- }
-
- if (ioremap_pmd_range(pud, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (pud++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
-static int ioremap_try_huge_p4d(p4d_t *p4d, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr,
- pgprot_t prot)
-{
- if (!ioremap_p4d_enabled())
- return 0;
-
- if ((end - addr) != P4D_SIZE)
- return 0;
-
- if (!IS_ALIGNED(addr, P4D_SIZE))
- return 0;
-
- if (!IS_ALIGNED(phys_addr, P4D_SIZE))
- return 0;
-
- if (p4d_present(*p4d) && !p4d_free_pud_page(p4d, addr))
- return 0;
-
- return p4d_set_huge(p4d, phys_addr, prot);
-}
-
-static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot,
- pgtbl_mod_mask *mask)
-{
- p4d_t *p4d;
- unsigned long next;
-
- p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
- if (!p4d)
- return -ENOMEM;
- do {
- next = p4d_addr_end(addr, end);
-
- if (ioremap_try_huge_p4d(p4d, addr, next, phys_addr, prot)) {
- *mask |= PGTBL_P4D_MODIFIED;
- continue;
- }
-
- if (ioremap_pud_range(p4d, addr, next, phys_addr, prot, mask))
- return -ENOMEM;
- } while (p4d++, phys_addr += (next - addr), addr = next, addr != end);
- return 0;
-}
-
-int ioremap_page_range(unsigned long addr,
- unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
-{
- pgd_t *pgd;
- unsigned long start;
- unsigned long next;
- int err;
- pgtbl_mod_mask mask = 0;
-
- might_sleep();
- BUG_ON(addr >= end);
-
- start = addr;
- pgd = pgd_offset_k(addr);
- do {
- next = pgd_addr_end(addr, end);
- err = ioremap_p4d_range(pgd, addr, next, phys_addr, prot,
- &mask);
- if (err)
- break;
- } while (pgd++, phys_addr += (next - addr), addr = next, addr != end);
-
- flush_cache_vmap(start, end);
-
- if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
- arch_sync_kernel_mappings(start, end);
-
- return err;
-}
-
-#ifdef CONFIG_GENERIC_IOREMAP
-void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
-{
- unsigned long offset, vaddr;
- phys_addr_t last_addr;
- struct vm_struct *area;
-
- /* Disallow wrap-around or zero size */
- last_addr = addr + size - 1;
- if (!size || last_addr < addr)
- return NULL;
-
- /* Page-align mappings */
- offset = addr & (~PAGE_MASK);
- addr -= offset;
- size = PAGE_ALIGN(size + offset);
-
- area = get_vm_area_caller(size, VM_IOREMAP,
- __builtin_return_address(0));
- if (!area)
- return NULL;
- vaddr = (unsigned long)area->addr;
-
- if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
- free_vm_area(area);
- return NULL;
- }
-
- return (void __iomem *)(vaddr + offset);
-}
-EXPORT_SYMBOL(ioremap_prot);
-
-void iounmap(volatile void __iomem *addr)
-{
- vunmap((void *)((unsigned long)addr & PAGE_MASK));
-}
-EXPORT_SYMBOL(iounmap);
-#endif /* CONFIG_GENERIC_IOREMAP */