* [PATCH v2 1/1] s390/dma: provide proper ARCH_ZONE_DMA_BITS value
@ 2019-07-23 22:51 Halil Pasic
2019-07-24 5:44 ` Heiko Carstens
0 siblings, 1 reply; 2+ messages in thread
From: Halil Pasic @ 2019-07-23 22:51 UTC (permalink / raw)
To: kvm, linux-s390, Christoph Hellwig, Heiko Carstens, Vasily Gorbik
Cc: Halil Pasic, Petr Tesarik, Christian Borntraeger, Janosch Frank
On s390 ZONE_DMA is up to 2G, i.e. ARCH_ZONE_DMA_BITS should be 31 bits.
The current value is 24 and makes __dma_direct_alloc_pages() take a
wrong turn first (but __dma_direct_alloc_pages() recovers then).
Let's correct ARCH_ZONE_DMA_BITS value and avoid wrong turns.
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reported-by: Petr Tesarik <ptesarik@suse.cz>
Fixes: c61e9637340e ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32")
---
arch/s390/include/asm/page.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index a4d38092530a..27470dae31d2 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -177,6 +177,8 @@ static inline int devmem_is_allowed(unsigned long pfn)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+#define ARCH_ZONE_DMA_BITS 31
+
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2 1/1] s390/dma: provide proper ARCH_ZONE_DMA_BITS value
2019-07-23 22:51 [PATCH v2 1/1] s390/dma: provide proper ARCH_ZONE_DMA_BITS value Halil Pasic
@ 2019-07-24 5:44 ` Heiko Carstens
0 siblings, 0 replies; 2+ messages in thread
From: Heiko Carstens @ 2019-07-24 5:44 UTC (permalink / raw)
To: Halil Pasic
Cc: kvm, linux-s390, Christoph Hellwig, Vasily Gorbik, Petr Tesarik,
Christian Borntraeger, Janosch Frank
On Wed, Jul 24, 2019 at 12:51:55AM +0200, Halil Pasic wrote:
> On s390 ZONE_DMA is up to 2G, i.e. ARCH_ZONE_DMA_BITS should be 31 bits.
> The current value is 24 and makes __dma_direct_alloc_pages() take a
> wrong turn first (but __dma_direct_alloc_pages() recovers then).
>
> Let's correct ARCH_ZONE_DMA_BITS value and avoid wrong turns.
>
> Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> Reported-by: Petr Tesarik <ptesarik@suse.cz>
> Fixes: c61e9637340e ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32")
> ---
> arch/s390/include/asm/page.h | 2 ++
> 1 file changed, 2 insertions(+)
Applied, thanks!
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-07-23 22:51 [PATCH v2 1/1] s390/dma: provide proper ARCH_ZONE_DMA_BITS value Halil Pasic
2019-07-24 5:44 ` Heiko Carstens
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