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s390/dma: Allow per device dma ops 

As virtio-ccw will have dma ops, we can no longer default to the
zPCI ones. Make use of dev_archdata to keep the dma_ops per device.
The pci devices now use that to override the default, and the
default is changed to use the noop ops for everything that does not
specify a device specific one.
To compile without PCI support we will enable HAS_DMA all the time,
via the default config in lib/Kconfig.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Christian Borntraeger 2016-02-02 21:46:34 -08:00 committed by Michael S. Tsirkin
parent 6aca050384
commit e82becfc18
5 changed files with 13 additions and 9 deletions
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5
arch/s390/Kconfig
View File

@ -124,6 +124,7 @@ config S390
select HAVE_CMPXCHG_DOUBLE
select HAVE_CMPXCHG_LOCAL
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_API_DEBUG
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_FTRACE_MCOUNT_RECORD
@ -619,10 +620,6 @@ config HAS_IOMEM
config IOMMU_HELPER
def_bool PCI
config HAS_DMA
def_bool PCI
select HAVE_DMA_API_DEBUG
config NEED_SG_DMA_LENGTH
def_bool PCI

6
arch/s390/include/asm/device.h
View File

@ -3,5 +3,9 @@
*
* This file is released under the GPLv2
*/
#include <asm-generic/device.h>
struct dev_archdata {
struct dma_map_ops *dma_ops;
};
struct pdev_archdata {
};

6
arch/s390/include/asm/dma-mapping.h
View File

@ -11,11 +11,13 @@
#define DMA_ERROR_CODE (~(dma_addr_t) 0x0)
extern struct dma_map_ops s390_dma_ops;
extern struct dma_map_ops s390_pci_dma_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
return &s390_dma_ops;
if (dev && dev->archdata.dma_ops)
return dev->archdata.dma_ops;
return &dma_noop_ops;
}
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

1
arch/s390/pci/pci.c
View File

@ -643,6 +643,7 @@ int pcibios_add_device(struct pci_dev *pdev)
zdev->pdev = pdev;
pdev->dev.groups = zpci_attr_groups;
pdev->dev.archdata.dma_ops = &s390_pci_dma_ops;
zpci_map_resources(pdev);
for (i = 0; i < PCI_BAR_COUNT; i++) {

4
arch/s390/pci/pci_dma.c
View File

@ -544,7 +544,7 @@ static int __init dma_debug_do_init(void)
}
fs_initcall(dma_debug_do_init);
struct dma_map_ops s390_dma_ops = {
struct dma_map_ops s390_pci_dma_ops = {
.alloc = s390_dma_alloc,
.free = s390_dma_free,
.map_sg = s390_dma_map_sg,
@ -555,7 +555,7 @@ struct dma_map_ops s390_dma_ops = {
.is_phys = 0,
/* dma_supported is unconditionally true without a callback */
};
EXPORT_SYMBOL_GPL(s390_dma_ops);
EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
static int __init s390_iommu_setup(char *str)
{