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powerpc/32s: automatically allocate BAT in setbat()

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If no BAT is given to setbat(), select an available BAT.

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/a212bd36fbd6179e0929b6c727febc35132ac25c.1568665466.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-09-16 20:25:39 +00:00 committed by Michael Ellerman
parent d538aadc27
commit cbcaff7d27
1 changed files with 10 additions and 1 deletions
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11
arch/powerpc/mm/book3s32/mmu.c
View file

@ -251,9 +251,18 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys,
{
unsigned int bl;
int wimgxpp;
struct ppc_bat *bat = BATS[index];
struct ppc_bat *bat;
unsigned long flags = pgprot_val(prot);
if (index == -1)
index = find_free_bat();
if (index == -1) {
pr_err("%s: no BAT available for mapping 0x%llx\n", __func__,
(unsigned long long)phys);
return;
}
bat = BATS[index];
if ((flags & _PAGE_NO_CACHE) ||
(cpu_has_feature(CPU_FTR_NEED_COHERENT) == 0))
flags &= ~_PAGE_COHERENT;