openharmony/kernel_linux
1
0
Fork 0
mirror of https://gitee.com/openharmony/kernel_linux synced 2025-05-28 18:16:56 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

arm/xen: get_dma_ops: return xen_dma_ops if we are running as xen_initial_domain

Browse Source 
We can't simply override arm_dma_ops with xen_dma_ops because devices
are allowed to have their own dma_ops and they take precedence over
arm_dma_ops. When running on Xen as initial domain, we always want
xen_dma_ops to be the one in use.

We introduce __generic_dma_ops to allow xen_dma_ops functions to call
back to the native implementation.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
CC: will.deacon@arm.com
CC: linux@arm.linux.org.uk

Changes in v7:
- return xen_dma_ops only if we are the initial domain;
- rename __get_dma_ops to __generic_dma_ops.
This commit is contained in:
Stefano Stabellini 2013-10-18 16:01:26 +00:00
parent eb1ddc00b8
commit c7e9bc5483
1 changed files with 12 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/arm/include/asm/dma-mapping.h
View File

@ -12,17 +12,28 @@
#include <asm/memory.h>
#include <asm/cacheflush.h>
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#define DMA_ERROR_CODE (~0)
extern struct dma_map_ops arm_dma_ops;
extern struct dma_map_ops arm_coherent_dma_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
{
if (dev && dev->archdata.dma_ops)
return dev->archdata.dma_ops;
return &arm_dma_ops;
}
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
if (xen_initial_domain())
return xen_dma_ops;
else
return __generic_dma_ops(dev);
}
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
BUG_ON(!dev);