68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* Glue code to lib/swiotlb-xen.c */
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/pci.h>
|
|
#include <xen/swiotlb-xen.h>
|
|
|
|
#include <asm/xen/hypervisor.h>
|
|
#include <xen/xen.h>
|
|
#include <asm/iommu_table.h>
|
|
|
|
int xen_swiotlb __read_mostly;
|
|
|
|
static struct dma_map_ops xen_swiotlb_dma_ops = {
|
|
.mapping_error = xen_swiotlb_dma_mapping_error,
|
|
.alloc_coherent = xen_swiotlb_alloc_coherent,
|
|
.free_coherent = xen_swiotlb_free_coherent,
|
|
.sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
|
|
.sync_single_for_device = xen_swiotlb_sync_single_for_device,
|
|
.sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
|
|
.sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
|
|
.map_sg = xen_swiotlb_map_sg_attrs,
|
|
.unmap_sg = xen_swiotlb_unmap_sg_attrs,
|
|
.map_page = xen_swiotlb_map_page,
|
|
.unmap_page = xen_swiotlb_unmap_page,
|
|
.dma_supported = xen_swiotlb_dma_supported,
|
|
};
|
|
|
|
/*
|
|
* pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
|
|
*
|
|
* This returns non-zero if we are forced to use xen_swiotlb (by the boot
|
|
* option).
|
|
*/
|
|
int __init pci_xen_swiotlb_detect(void)
|
|
{
|
|
|
|
/* If running as PV guest, either iommu=soft, or swiotlb=force will
|
|
* activate this IOMMU. If running as PV privileged, activate it
|
|
* irregardlesss.
|
|
*/
|
|
if ((xen_initial_domain() || swiotlb || swiotlb_force) &&
|
|
(xen_pv_domain()))
|
|
xen_swiotlb = 1;
|
|
|
|
/* If we are running under Xen, we MUST disable the native SWIOTLB.
|
|
* Don't worry about swiotlb_force flag activating the native, as
|
|
* the 'swiotlb' flag is the only one turning it on. */
|
|
if (xen_pv_domain())
|
|
swiotlb = 0;
|
|
|
|
return xen_swiotlb;
|
|
}
|
|
|
|
void __init pci_xen_swiotlb_init(void)
|
|
{
|
|
if (xen_swiotlb) {
|
|
xen_swiotlb_init(1);
|
|
dma_ops = &xen_swiotlb_dma_ops;
|
|
|
|
/* Make sure ACS will be enabled */
|
|
pci_request_acs();
|
|
}
|
|
}
|
|
IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
|
|
0,
|
|
pci_xen_swiotlb_init,
|
|
0);
|