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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-09-16 20:25:39 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2019-11-19 19:38:38 +1100
commitcbcaff7d27ad5c5d2c2db113ec489be88adb815a (patch)
treee32477e84c50af636be70fd6f1ea2160dc57892b
parentd538aadc2718a95bfd80095c66ea814824535b34 (diff)
powerpc/32s: automatically allocate BAT in setbat()
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
-rw-r--r--arch/powerpc/mm/book3s32/mmu.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index 84d5fab94f8f..69b2419accef 100644
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -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;