[PATCH 6/6] MIPS: use ioremap_page_range

Christoph Hellwig
2020-03-24T16:20:09Z

Use the generic ioremap_page_range helper instead of reimplementing it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/mips/mm/ioremap.c | 112 ++++-------------------------------------
1 file changed, 11 insertions(+), 101 deletions(-)

diff --git a/arch/mips/mm/ioremap.c b/arch/mips/mm/ioremap.c
index c5b5181c7cd0..b6dad2fd5575 100644
--- a/arch/mips/mm/ioremap.c
+++ b/arch/mips/mm/ioremap.c
@@ -14,99 +14,14 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm_types.h>
+#include <linux/io.h>
#include <asm/cacheflush.h>
-#include <asm/io.h>
#include <asm/tlbflush.h>
#include <ioremap.h>

#define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL))
#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)

-static inline void remap_area_pte(pte_t * pte, unsigned long address,
- phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
-{
- phys_addr_t end;
- unsigned long pfn;
- pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
- | __WRITEABLE | flags);
-
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
- BUG_ON(address >= end);
- pfn = phys_addr >> PAGE_SHIFT;
- do {
- if (!pte_none(*pte)) {
- printk("remap_area_pte: page already exists\n");
- BUG();
- }
- set_pte(pte, pfn_pte(pfn, pgprot));
- address += PAGE_SIZE;
- pfn++;
- pte++;
- } while (address && (address < end));
-}
-
-static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
- phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
-{
- phys_addr_t end;
-
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
- phys_addr -= address;
- BUG_ON(address >= end);
- do {
- pte_t * pte = pte_alloc_kernel(pmd, address);
- if (!pte)
- return -ENOMEM;
- remap_area_pte(pte, address, end - address, address + phys_addr, flags);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address && (address < end));
- return 0;
-}
-
-static int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
- phys_addr_t size, unsigned long flags)
-{
- int error;
- pgd_t * dir;
- unsigned long end = address + size;
-
- phys_addr -= address;
- dir = pgd_offset(&init_mm, address);
- flush_cache_all();
- BUG_ON(address >= end);
- do {
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
-
- error = -ENOMEM;
- p4d = p4d_alloc(&init_mm, dir, address);
- if (!p4d)
- break;
- pud = pud_alloc(&init_mm, p4d, address);
- if (!pud)
- break;
- pmd = pmd_alloc(&init_mm, pud, address);
- if (!pmd)
- break;
- if (remap_area_pmd(pmd, address, end - address,
- phys_addr + address, flags))
- break;
- error = 0;
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
- flush_tlb_all();
- return error;
-}
-
static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
void *arg)
{
@@ -135,7 +50,7 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
unsigned long offset, pfn, last_pfn;
struct vm_struct *area;
phys_addr_t last_addr;
- void *addr;
+ unsigned long vaddr;
void __iomem *cpu_addr;

cpu_addr = plat_ioremap(phys_addr, size, flags);
@@ -183,27 +98,22 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
- addr = area->addr;
- if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
- vunmap(addr);
+ vaddr = (unsigned long)area->addr;
+
+ flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE;
+ if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
+ __pgprot(flags))) {
+ free_vm_area(area);
return NULL;
}

- return (void __iomem *) (offset + (char *)addr);
+ return (void __iomem *)(vaddr + offset);
}
EXPORT_SYMBOL(ioremap_prot);

void iounmap(const volatile void __iomem *addr)
{
- struct vm_struct *p;
-
- if (plat_iounmap(addr) || IS_KSEG1(addr))
- return;
-
- p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
- if (!p)
- printk(KERN_ERR "iounmap: bad address %p\n", addr);
-
- kfree(p);
+ if (!plat_iounmap(addr) && !IS_KSEG1(addr))
+ vunmap((void *)((unsigned long)addr & PAGE_MASK));
}
EXPORT_SYMBOL(iounmap);
--
2.25.1