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powerpc/64s/radix: Split early page table mapping to its own function 

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2018-02-14 01:08:23 +10:00 committed by Michael Ellerman
parent f3865f9a71
commit 0633dafcf8
1 changed files with 65 additions and 47 deletions
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68
arch/powerpc/mm/pgtable-radix.c
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@ -56,7 +56,7 @@ static __ref void *early_alloc_pgtable(unsigned long size)
return pt; return pt;
} }
int radix__map_kernel_page(unsigned long ea, unsigned long pa, static int early_map_kernel_page(unsigned long ea, unsigned long pa,
pgprot_t flags, pgprot_t flags,
unsigned int map_page_size) unsigned int map_page_size)
{ {
@ -64,30 +64,7 @@ int radix__map_kernel_page(unsigned long ea, unsigned long pa,
pud_t *pudp; pud_t *pudp;
pmd_t *pmdp; pmd_t *pmdp;
pte_t *ptep; pte_t *ptep;
/*
* Make sure task size is correct as per the max adddr
*/
BUILD_BUG_ON(TASK_SIZE_USER64 > RADIX_PGTABLE_RANGE);
if (slab_is_available()) {
pgdp = pgd_offset_k(ea);
pudp = pud_alloc(&init_mm, pgdp, ea);
if (!pudp)
return -ENOMEM;
if (map_page_size == PUD_SIZE) {
ptep = (pte_t *)pudp;
goto set_the_pte;
}
pmdp = pmd_alloc(&init_mm, pudp, ea);
if (!pmdp)
return -ENOMEM;
if (map_page_size == PMD_SIZE) {
ptep = pmdp_ptep(pmdp);
goto set_the_pte;
}
ptep = pte_alloc_kernel(pmdp, ea);
if (!ptep)
return -ENOMEM;
} else {
pgdp = pgd_offset_k(ea); pgdp = pgd_offset_k(ea);
if (pgd_none(*pgdp)) { if (pgd_none(*pgdp)) {
pudp = early_alloc_pgtable(PUD_TABLE_SIZE); pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
@ -115,7 +92,48 @@ int radix__map_kernel_page(unsigned long ea, unsigned long pa,
pmd_populate_kernel(&init_mm, pmdp, ptep); pmd_populate_kernel(&init_mm, pmdp, ptep);
} }
ptep = pte_offset_kernel(pmdp, ea); ptep = pte_offset_kernel(pmdp, ea);
set_the_pte:
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, flags));
smp_wmb();
return 0;
}
int radix__map_kernel_page(unsigned long ea, unsigned long pa,
pgprot_t flags,
unsigned int map_page_size)
{
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
/*
* Make sure task size is correct as per the max adddr
*/
BUILD_BUG_ON(TASK_SIZE_USER64 > RADIX_PGTABLE_RANGE);
if (!slab_is_available())
return early_map_kernel_page(ea, pa, flags, map_page_size);
pgdp = pgd_offset_k(ea);
pudp = pud_alloc(&init_mm, pgdp, ea);
if (!pudp)
return -ENOMEM;
if (map_page_size == PUD_SIZE) {
ptep = (pte_t *)pudp;
goto set_the_pte;
} }
pmdp = pmd_alloc(&init_mm, pudp, ea);
if (!pmdp)
return -ENOMEM;
if (map_page_size == PMD_SIZE) {
ptep = pmdp_ptep(pmdp);
goto set_the_pte;
}
ptep = pte_alloc_kernel(pmdp, ea);
if (!ptep)
return -ENOMEM;
set_the_pte: set_the_pte:
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, flags)); set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, flags));