mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 16:45:02 +07:00
60d8cd572f
Xen-swiotlb hooks into the arm/arm64 arch code through a copy of the DMA
DMA mapping operations stored in the struct device arch data.
Switching arm64 to use the direct calls for the merged DMA direct /
swiotlb code broke this scheme. Replace the indirect calls with
direct-calls in xen-swiotlb as well to fix this problem.
Fixes: 356da6d0cd ("dma-mapping: bypass indirect calls for dma-direct")
Reported-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
|
|
#define _ASM_ARM_XEN_PAGE_COHERENT_H
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <asm/page.h>
|
|
#include <xen/arm/page-coherent.h>
|
|
|
|
static inline const struct dma_map_ops *xen_get_dma_ops(struct device *dev)
|
|
{
|
|
if (dev && dev->archdata.dev_dma_ops)
|
|
return dev->archdata.dev_dma_ops;
|
|
return get_arch_dma_ops(NULL);
|
|
}
|
|
|
|
static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
|
|
{
|
|
return xen_get_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
|
|
}
|
|
|
|
static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
xen_get_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
|
|
}
|
|
|
|
static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
|
|
dma_addr_t dev_addr, unsigned long offset, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
unsigned long page_pfn = page_to_xen_pfn(page);
|
|
unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
|
|
unsigned long compound_pages =
|
|
(1<<compound_order(page)) * XEN_PFN_PER_PAGE;
|
|
bool local = (page_pfn <= dev_pfn) &&
|
|
(dev_pfn - page_pfn < compound_pages);
|
|
|
|
/*
|
|
* Dom0 is mapped 1:1, while the Linux page can span across
|
|
* multiple Xen pages, it's not possible for it to contain a
|
|
* mix of local and foreign Xen pages. So if the first xen_pfn
|
|
* == mfn the page is local otherwise it's a foreign page
|
|
* grant-mapped in dom0. If the page is local we can safely
|
|
* call the native dma_ops function, otherwise we call the xen
|
|
* specific function.
|
|
*/
|
|
if (local)
|
|
xen_get_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
|
|
else
|
|
__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
|
|
}
|
|
|
|
static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
unsigned long pfn = PFN_DOWN(handle);
|
|
/*
|
|
* Dom0 is mapped 1:1, while the Linux page can be spanned accross
|
|
* multiple Xen page, it's not possible to have a mix of local and
|
|
* foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
|
|
* foreign mfn will always return false. If the page is local we can
|
|
* safely call the native dma_ops function, otherwise we call the xen
|
|
* specific function.
|
|
*/
|
|
if (pfn_valid(pfn)) {
|
|
if (xen_get_dma_ops(hwdev)->unmap_page)
|
|
xen_get_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
|
|
} else
|
|
__xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
|
|
}
|
|
|
|
static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
unsigned long pfn = PFN_DOWN(handle);
|
|
if (pfn_valid(pfn)) {
|
|
if (xen_get_dma_ops(hwdev)->sync_single_for_cpu)
|
|
xen_get_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
|
|
} else
|
|
__xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
|
|
}
|
|
|
|
static inline void xen_dma_sync_single_for_device(struct device *hwdev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir)
|
|
{
|
|
unsigned long pfn = PFN_DOWN(handle);
|
|
if (pfn_valid(pfn)) {
|
|
if (xen_get_dma_ops(hwdev)->sync_single_for_device)
|
|
xen_get_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
|
|
} else
|
|
__xen_dma_sync_single_for_device(hwdev, handle, size, dir);
|
|
}
|
|
|
|
#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
|