mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
163918fc57
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
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <asm/io-workarounds.h>
|
|
|
|
unsigned long ioremap_bot;
|
|
EXPORT_SYMBOL(ioremap_bot);
|
|
|
|
void __iomem *ioremap(phys_addr_t addr, unsigned long size)
|
|
{
|
|
pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
|
|
void *caller = __builtin_return_address(0);
|
|
|
|
if (iowa_is_active())
|
|
return iowa_ioremap(addr, size, prot, caller);
|
|
return __ioremap_caller(addr, size, prot, caller);
|
|
}
|
|
EXPORT_SYMBOL(ioremap);
|
|
|
|
void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
|
|
{
|
|
pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
|
|
void *caller = __builtin_return_address(0);
|
|
|
|
if (iowa_is_active())
|
|
return iowa_ioremap(addr, size, prot, caller);
|
|
return __ioremap_caller(addr, size, prot, caller);
|
|
}
|
|
EXPORT_SYMBOL(ioremap_wc);
|
|
|
|
void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
|
|
{
|
|
pgprot_t prot = pgprot_cached(PAGE_KERNEL);
|
|
void *caller = __builtin_return_address(0);
|
|
|
|
if (iowa_is_active())
|
|
return iowa_ioremap(addr, size, prot, caller);
|
|
return __ioremap_caller(addr, size, prot, caller);
|
|
}
|
|
|
|
void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
|
|
{
|
|
pte_t pte = __pte(flags);
|
|
void *caller = __builtin_return_address(0);
|
|
|
|
/* writeable implies dirty for kernel addresses */
|
|
if (pte_write(pte))
|
|
pte = pte_mkdirty(pte);
|
|
|
|
/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
|
|
pte = pte_exprotect(pte);
|
|
pte = pte_mkprivileged(pte);
|
|
|
|
if (iowa_is_active())
|
|
return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
|
|
return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
|
|
}
|
|
EXPORT_SYMBOL(ioremap_prot);
|
|
|
|
int early_ioremap_range(unsigned long ea, phys_addr_t pa,
|
|
unsigned long size, pgprot_t prot)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i = 0; i < size; i += PAGE_SIZE) {
|
|
int err = map_kernel_page(ea + i, pa + i, prot);
|
|
|
|
if (WARN_ON_ONCE(err)) /* Should clean up */
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __iomem *do_ioremap(phys_addr_t pa, phys_addr_t offset, unsigned long size,
|
|
pgprot_t prot, void *caller)
|
|
{
|
|
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;
|
|
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;
|
|
}
|