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xen/arm,arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..."

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The following commit:

  commit 815dd18788
  Author: Bart Van Assche <[email protected]>
  Date:   Fri Jan 20 13:04:04 2017 -0800

      treewide: Consolidate get_dma_ops() implementations

rearranges get_dma_ops in a way that xen_dma_ops are not returned when
running on Xen anymore, dev->dma_ops is returned instead (see
arch/arm/include/asm/dma-mapping.h:get_arch_dma_ops and
include/linux/dma-mapping.h:get_dma_ops).

Fix the problem by storing dev->dma_ops in dev_archdata, and setting
dev->dma_ops to xen_dma_ops. This way, xen_dma_ops is returned naturally
by get_dma_ops. The Xen code can retrieve the original dev->dma_ops from
dev_archdata when needed. It also allows us to remove __generic_dma_ops
from common headers.

Signed-off-by: Stefano Stabellini <[email protected]>
Tested-by: Julien Grall <[email protected]>
Suggested-by: Catalin Marinas <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Cc: <[email protected]>        [4.11+]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: Julien Grall <[email protected]>
This commit is contained in:
Stefano Stabellini 2017-04-13 14:04:21 -07:00 • committed by Juergen Gross
commit e058632670
7 changed files with 30 additions and 23 deletions
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8
include/xen/arm/page-coherent.h
View file

@ -2,8 +2,16 @@
#define _ASM_ARM_XEN_PAGE_COHERENT_H
#include <asm/page.h>
#include <asm/dma-mapping.h>
#include <linux/dma-mapping.h>
static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (dev && dev->archdata.dev_dma_ops)
return dev->archdata.dev_dma_ops;
return get_arch_dma_ops(NULL);
}
void __xen_dma_map_page(struct device *hwdev, struct page *page,
dma_addr_t dev_addr, unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs);