mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 01:51:53 +00:00
1b65c4e5a9
Use xen_alloc_coherent_pages and xen_free_coherent_pages to allocate or free coherent pages. We need to be careful handling the pointer returned by xen_alloc_coherent_pages, because on ARM the pointer is not equal to phys_to_virt(*dma_handle). In fact virt_to_phys only works for kernel direct mapped RAM memory. In ARM case the pointer could be an ioremap address, therefore passing it to virt_to_phys would give you another physical address that doesn't correspond to it. Make xen_create_contiguous_region take a phys_addr_t as start parameter to avoid the virt_to_phys calls which would be incorrect. Changes in v6: - remove extra spaces. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#include <linux/bootmem.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/export.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/swiotlb.h>
|
|
|
|
#include <xen/xen.h>
|
|
#include <xen/interface/memory.h>
|
|
#include <xen/swiotlb-xen.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/xen/page.h>
|
|
#include <asm/xen/hypercall.h>
|
|
#include <asm/xen/interface.h>
|
|
|
|
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
|
|
unsigned int address_bits,
|
|
dma_addr_t *dma_handle)
|
|
{
|
|
if (!xen_initial_domain())
|
|
return -EINVAL;
|
|
|
|
/* we assume that dom0 is mapped 1:1 for now */
|
|
*dma_handle = pstart;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
|
|
|
|
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
|
|
{
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
|
|
|
|
struct dma_map_ops *xen_dma_ops;
|
|
EXPORT_SYMBOL_GPL(xen_dma_ops);
|
|
|
|
static struct dma_map_ops xen_swiotlb_dma_ops = {
|
|
.mapping_error = xen_swiotlb_dma_mapping_error,
|
|
.alloc = xen_swiotlb_alloc_coherent,
|
|
.free = 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,
|
|
.set_dma_mask = xen_swiotlb_set_dma_mask,
|
|
};
|
|
|
|
int __init xen_mm_init(void)
|
|
{
|
|
if (!xen_initial_domain())
|
|
return 0;
|
|
xen_swiotlb_init(1, false);
|
|
xen_dma_ops = &xen_swiotlb_dma_ops;
|
|
return 0;
|
|
}
|
|
arch_initcall(xen_mm_init);
|