xref: /openbmc/linux/drivers/iommu/dma-iommu.h (revision 791c2b17) 
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2014-2015 ARM Ltd.
4  */
5 #ifndef __DMA_IOMMU_H
6 #define __DMA_IOMMU_H
7 
8 #include <linux/iommu.h>
9 
10 #ifdef CONFIG_IOMMU_DMA
11 
12 int iommu_get_dma_cookie(struct iommu_domain *domain);
13 void iommu_put_dma_cookie(struct iommu_domain *domain);
14 
15 int iommu_dma_init_fq(struct iommu_domain *domain);
16 
17 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
18 
19 extern bool iommu_dma_forcedac;
iommu_dma_set_pci_32bit_workaround(struct device * dev)20 static inline void iommu_dma_set_pci_32bit_workaround(struct device *dev)
21 {
22 	dev->iommu->pci_32bit_workaround = !iommu_dma_forcedac;
23 }
24 
25 #else /* CONFIG_IOMMU_DMA */
26 
iommu_dma_init_fq(struct iommu_domain * domain)27 static inline int iommu_dma_init_fq(struct iommu_domain *domain)
28 {
29 	return -EINVAL;
30 }
31 
iommu_get_dma_cookie(struct iommu_domain * domain)32 static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
33 {
34 	return -ENODEV;
35 }
36 
iommu_put_dma_cookie(struct iommu_domain * domain)37 static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
38 {
39 }
40 
iommu_dma_get_resv_regions(struct device * dev,struct list_head * list)41 static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
42 {
43 }
44 
iommu_dma_set_pci_32bit_workaround(struct device * dev)45 static inline void iommu_dma_set_pci_32bit_workaround(struct device *dev)
46 {
47 }
48 
49 #endif	/* CONFIG_IOMMU_DMA */
50 #endif	/* __DMA_IOMMU_H */
51