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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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xen/arm: use hypercall to flush caches in map_page
In xen_dma_map_page, if the page is a local page, call the native map_page dma_ops. If the page is foreign, call __xen_dma_map_page that issues any required cache maintenane operations via hypercall. The reason for doing this is that the native dma_ops map_page could allocate buffers than need to be freed. If the page is foreign we don't call the native unmap_page dma_ops function, resulting in a memory leak. Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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arch/arm
@ -5,6 +5,9 @@
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#include <linux/dma-attrs.h>
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#include <linux/dma-mapping.h>
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void __xen_dma_map_page(struct device *hwdev, struct page *page,
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dma_addr_t dev_addr, unsigned long offset, size_t size,
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enum dma_data_direction dir, struct dma_attrs *attrs);
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void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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@ -32,7 +35,15 @@ static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
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dma_addr_t dev_addr, unsigned long offset, size_t size,
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enum dma_data_direction dir, struct dma_attrs *attrs)
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{
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__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
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bool local = PFN_DOWN(dev_addr) == page_to_pfn(page);
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/* Dom0 is mapped 1:1, so if pfn == mfn the page is local otherwise
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* is a foreign page grant-mapped in dom0. If the page is local we
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* can safely call the native dma_ops function, otherwise we call
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* the xen specific function. */
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if (local)
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__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
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else
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__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
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}
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static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
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@ -43,6 +43,18 @@ static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle,
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dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP);
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}
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void __xen_dma_map_page(struct device *hwdev, struct page *page,
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dma_addr_t dev_addr, unsigned long offset, size_t size,
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enum dma_data_direction dir, struct dma_attrs *attrs)
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{
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if (is_device_dma_coherent(hwdev))
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return;
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if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
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return;
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__xen_dma_page_cpu_to_dev(hwdev, dev_addr, size, dir);
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}
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void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs)
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