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SubjectRe: [PATCH] powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac
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Christoph Hellwig <hch@lst.de> writes:
> Any chance this could get picked up to fix the regression?

Was hoping Ben would Ack it. He's still powermac maintainer :)

I guess he OK'ed it in the other thread, will add it to my queue.

cheers

> On Thu, Jun 13, 2019 at 10:24:46AM +0200, Christoph Hellwig wrote:
>> With the strict dma mask checking introduced with the switch to
>> the generic DMA direct code common wifi chips on 32-bit powerbooks
>> stopped working. Add a 30-bit ZONE_DMA to the 32-bit pmac builds
>> to allow them to reliably allocate dma coherent memory.
>>
>> Fixes: 65a21b71f948 ("powerpc/dma: remove dma_nommu_dma_supported")
>> Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> ---
>> arch/powerpc/include/asm/page.h | 7 +++++++
>> arch/powerpc/mm/mem.c | 3 ++-
>> arch/powerpc/platforms/powermac/Kconfig | 1 +
>> 3 files changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
>> index b8286a2013b4..0d52f57fca04 100644
>> --- a/arch/powerpc/include/asm/page.h
>> +++ b/arch/powerpc/include/asm/page.h
>> @@ -319,6 +319,13 @@ struct vm_area_struct;
>> #endif /* __ASSEMBLY__ */
>> #include <asm/slice.h>
>>
>> +/*
>> + * Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks.
>> + */
>> +#ifdef CONFIG_PPC32
>> +#define ARCH_ZONE_DMA_BITS 30
>> +#else
>> #define ARCH_ZONE_DMA_BITS 31
>> +#endif
>>
>> #endif /* _ASM_POWERPC_PAGE_H */
>> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
>> index cba29131bccc..2540d3b2588c 100644
>> --- a/arch/powerpc/mm/mem.c
>> +++ b/arch/powerpc/mm/mem.c
>> @@ -248,7 +248,8 @@ void __init paging_init(void)
>> (long int)((top_of_ram - total_ram) >> 20));
>>
>> #ifdef CONFIG_ZONE_DMA
>> - max_zone_pfns[ZONE_DMA] = min(max_low_pfn, 0x7fffffffUL >> PAGE_SHIFT);
>> + max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
>> + ((1UL << ARCH_ZONE_DMA_BITS) - 1) >> PAGE_SHIFT);
>> #endif
>> max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
>> #ifdef CONFIG_HIGHMEM
>> diff --git a/arch/powerpc/platforms/powermac/Kconfig b/arch/powerpc/platforms/powermac/Kconfig
>> index f834a19ed772..c02d8c503b29 100644
>> --- a/arch/powerpc/platforms/powermac/Kconfig
>> +++ b/arch/powerpc/platforms/powermac/Kconfig
>> @@ -7,6 +7,7 @@ config PPC_PMAC
>> select PPC_INDIRECT_PCI if PPC32
>> select PPC_MPC106 if PPC32
>> select PPC_NATIVE
>> + select ZONE_DMA if PPC32
>> default y
>>
>> config PPC_PMAC64
>> --
>> 2.20.1
> ---end quoted text---

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