* [PATCH] dmaengine: ioat: Allocate correct size for descriptor chunk
@ 2020-09-22 20:08 Logan Gunthorpe
2020-09-22 20:18 ` Dave Jiang
2020-10-05 4:46 ` Vinod Koul
0 siblings, 2 replies; 3+ messages in thread
From: Logan Gunthorpe @ 2020-09-22 20:08 UTC (permalink / raw)
To: dmaengine, linux-kernel
Cc: Logan Gunthorpe, Robin Murphy, Vinod Koul, Dave Jiang, Dan Williams
dma_alloc_coherent() is called with a fixed SZ_2M size, but frees happen
with IOAT_CHUNK_SIZE. Recently, IOAT_CHUNK_SIZE was reduced to 512M but
the allocation did not change. To fix, change to using the
IOAT_CHUNK_SIZE define.
This was caught with the upcoming patchset for converting Intel platforms to the
dma-iommu implementation. It has a warning when the unmapped size differs from
the mapped size.
Fixes: a02254f8a676 ("dmaengine: ioat: Decreasing allocation chunk size 2M->512K")
Link: https://lore.kernel.org/intel-gfx/776771a2-247a-d1be-d882-bee02d919ae0@deltatee.com/
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
---
drivers/dma/ioat/dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index a814b200299b..07296171e2bb 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -389,7 +389,7 @@ ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
struct ioat_descs *descs = &ioat_chan->descs[i];
descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
- SZ_2M, &descs->hw, flags);
+ IOAT_CHUNK_SIZE, &descs->hw, flags);
if (!descs->virt) {
int idx;
base-commit: ba4f184e126b751d1bffad5897f263108befc780
--
2.20.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] dmaengine: ioat: Allocate correct size for descriptor chunk
2020-09-22 20:08 [PATCH] dmaengine: ioat: Allocate correct size for descriptor chunk Logan Gunthorpe
@ 2020-09-22 20:18 ` Dave Jiang
2020-10-05 4:46 ` Vinod Koul
1 sibling, 0 replies; 3+ messages in thread
From: Dave Jiang @ 2020-09-22 20:18 UTC (permalink / raw)
To: Logan Gunthorpe, dmaengine, linux-kernel
Cc: Robin Murphy, Vinod Koul, Dan Williams
On 9/22/2020 1:08 PM, Logan Gunthorpe wrote:
> dma_alloc_coherent() is called with a fixed SZ_2M size, but frees happen
> with IOAT_CHUNK_SIZE. Recently, IOAT_CHUNK_SIZE was reduced to 512M but
> the allocation did not change. To fix, change to using the
> IOAT_CHUNK_SIZE define.
>
> This was caught with the upcoming patchset for converting Intel platforms to the
> dma-iommu implementation. It has a warning when the unmapped size differs from
> the mapped size.
>
> Fixes: a02254f8a676 ("dmaengine: ioat: Decreasing allocation chunk size 2M->512K")
> Link: https://lore.kernel.org/intel-gfx/776771a2-247a-d1be-d882-bee02d919ae0@deltatee.com/
> Suggested-by: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Cc: Vinod Koul <vkoul@kernel.org>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Thanks Logan.
> ---
> drivers/dma/ioat/dma.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
> index a814b200299b..07296171e2bb 100644
> --- a/drivers/dma/ioat/dma.c
> +++ b/drivers/dma/ioat/dma.c
> @@ -389,7 +389,7 @@ ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
> struct ioat_descs *descs = &ioat_chan->descs[i];
>
> descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
> - SZ_2M, &descs->hw, flags);
> + IOAT_CHUNK_SIZE, &descs->hw, flags);
> if (!descs->virt) {
> int idx;
>
>
> base-commit: ba4f184e126b751d1bffad5897f263108befc780
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] dmaengine: ioat: Allocate correct size for descriptor chunk
2020-09-22 20:08 [PATCH] dmaengine: ioat: Allocate correct size for descriptor chunk Logan Gunthorpe
2020-09-22 20:18 ` Dave Jiang
@ 2020-10-05 4:46 ` Vinod Koul
1 sibling, 0 replies; 3+ messages in thread
From: Vinod Koul @ 2020-10-05 4:46 UTC (permalink / raw)
To: Logan Gunthorpe
Cc: dmaengine, linux-kernel, Robin Murphy, Dave Jiang, Dan Williams
On 22-09-20, 14:08, Logan Gunthorpe wrote:
> dma_alloc_coherent() is called with a fixed SZ_2M size, but frees happen
> with IOAT_CHUNK_SIZE. Recently, IOAT_CHUNK_SIZE was reduced to 512M but
> the allocation did not change. To fix, change to using the
> IOAT_CHUNK_SIZE define.
>
> This was caught with the upcoming patchset for converting Intel platforms to the
> dma-iommu implementation. It has a warning when the unmapped size differs from
> the mapped size.
Applied, thanks
--
~Vinod
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-09-22 20:18 ` Dave Jiang
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