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powerpc/mm: split out early ioremap path. 

ioremap does things differently depending on whether
SLAB is available or not at different levels.

Try to separate the early path from the beginning.

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/3acd2dbe04b04f111475e7a59f2b6f2ab9b95ab6.1566309263.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-20 14:07:20 +00:00 committed by Michael Ellerman
parent 4a45b7460c
commit 163918fc57
4 changed files with 35 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/io.h
View File

@ -722,7 +722,8 @@ void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
extern void iounmap(volatile void __iomem *addr);
int ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot);
int early_ioremap_range(unsigned long ea, phys_addr_t pa,
unsigned long size, pgprot_t prot);
void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
pgprot_t prot, void *caller);

17
arch/powerpc/mm/ioremap.c
View File

@ -59,18 +59,11 @@ void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long f
}
EXPORT_SYMBOL(ioremap_prot);
int ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot)
int early_ioremap_range(unsigned long ea, phys_addr_t pa,
unsigned long size, pgprot_t prot)
{
unsigned long i;
if (slab_is_available()) {
int err = ioremap_page_range(ea, ea + size, pa, prot);
if (err)
unmap_kernel_range(ea, size);
return err;
}
for (i = 0; i < size; i += PAGE_SIZE) {
int err = map_kernel_page(ea + i, pa + i, prot);
@ -86,16 +79,20 @@ void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
{
struct vm_struct *area;
int ret;
unsigned long va;
area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START, IOREMAP_END, caller);
if (area == NULL)
return NULL;
area->phys_addr = pa;
ret = ioremap_range((unsigned long)area->addr, pa, size, prot);
va = (unsigned long)area->addr;
ret = ioremap_page_range(va, va + size, pa, prot);
if (!ret)
return (void __iomem *)area->addr + offset;
unmap_kernel_range(va, size);
free_vm_area(area);
return NULL;

13
arch/powerpc/mm/ioremap_32.c
View File

@ -60,24 +60,21 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, pgprot_t prot, void *call
*/
v = p_block_mapped(p);
if (v)
goto out;
return (void __iomem *)v + offset;
if (slab_is_available()) {
if (slab_is_available())
return do_ioremap(p, offset, size, prot, caller);
} else {
v = (ioremap_bot -= size);
}
/*
* Should check if it is a candidate for a BAT mapping
*/
err = ioremap_range((unsigned long)v, p, size, prot);
err = early_ioremap_range(ioremap_bot - size, p, size, prot);
if (err)
return NULL;
ioremap_bot -= size;
out:
return (void __iomem *)(v + ((unsigned long)addr & ~PAGE_MASK));
return (void __iomem *)ioremap_bot + offset;
}
void iounmap(volatile void __iomem *addr)

30
arch/powerpc/mm/ioremap_64.c
View File

@ -9,6 +9,9 @@
*/
void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot)
{
int ret;
unsigned long va = (unsigned long)ea;
/* We don't support the 4K PFN hack with ioremap */
if (pgprot_val(prot) & H_PAGE_4K_PFN)
return NULL;
@ -22,7 +25,15 @@ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_
WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
WARN_ON(size & ~PAGE_MASK);
if (ioremap_range((unsigned long)ea, pa, size, prot))
if (slab_is_available()) {
ret = ioremap_page_range(va, va + size, pa, prot);
if (ret)
unmap_kernel_range(va, size);
} else {
ret = early_ioremap_range(va, pa, size, prot);
}
if (ret)
return NULL;
return (void __iomem *)ea;
@ -48,6 +59,7 @@ void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
{
phys_addr_t paligned, offset;
void __iomem *ret;
int err;
/* We don't support the 4K PFN hack with ioremap */
if (pgprot_val(prot) & H_PAGE_4K_PFN)
@ -66,16 +78,16 @@ void __iomem *__ioremap_caller(phys_addr_t addr, unsigned long size,
if (size == 0 || paligned == 0)
return NULL;
if (slab_is_available()) {
if (slab_is_available())
return do_ioremap(paligned, offset, size, prot, caller);
} else {
ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot);
if (ret)
ioremap_bot += size;
}
if (ret)
ret += addr & ~PAGE_MASK;
err = early_ioremap_range(ioremap_bot, paligned, size, prot);
if (err)
return NULL;
ret = (void __iomem *)ioremap_bot + offset;
ioremap_bot += size;
return ret;
}