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Commit e82becfc authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Michael S. Tsirkin
Browse files

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: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarJoerg Roedel <jroedel@suse.de>
Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 6aca0503

arch/s390/Kconfig

+1 −4
Original line number Diff line number Diff line
@@ -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

arch/s390/include/asm/device.h

+5 −1
Original line number Diff line number Diff line
@@ -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 {

};

arch/s390/include/asm/dma-mapping.h

+4 −2
Original line number Diff line number Diff line
@@ -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,

arch/s390/pci/pci.c

+1 −0
Original line number Diff line number Diff line
@@ -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++) {

arch/s390/pci/pci_dma.c

+2 −2
Original line number Diff line number Diff line
@@ -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)

{