From cbcaff7d27ad5c5d2c2db113ec489be88adb815a Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Mon, 16 Sep 2019 20:25:39 +0000 Subject: [PATCH] powerpc/32s: automatically allocate BAT in setbat() If no BAT is given to setbat(), select an available BAT. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/a212bd36fbd6179e0929b6c727febc35132ac25c.1568665466.git.christophe.leroy@c-s.fr --- arch/powerpc/mm/book3s32/mmu.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) 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; -- 2.11.0