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MLK-17701 swiotlb-xen: implement xen_swiotlb_get_sgtable callback
Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
(cherry picked from commit 69369f52d2
)
on 8QM A0, video play use ion to allocate buffer and mmap buffer,
there is a call dma_get_sgtable, but xen arm not implement that.
when playing video, GPU driver will use sg dma address, but because
of xen_swiotlb_get_sgtable not implemented, sg->amd_address is not
exactly the address that ion allocated. This patch fixes the issue.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Leonard Crestez <leonard.crestez@nxp.com>
This commit is contained in:
parent
1b441a1b2f
commit
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@ -200,6 +200,7 @@ static struct dma_map_ops xen_swiotlb_dma_ops = {
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.dma_supported = xen_swiotlb_dma_supported,
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.set_dma_mask = xen_swiotlb_set_dma_mask,
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.mmap = xen_swiotlb_dma_mmap,
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.get_sgtable = xen_swiotlb_get_sgtable,
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};
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int __init xen_mm_init(void)
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@ -699,3 +699,31 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
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}
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EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap);
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/*
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* This function should be called with the pages from the current domain only,
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* passing pages mapped from other domains would lead to memory corruption.
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*/
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int
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xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t handle, size_t size,
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unsigned long attrs)
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{
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#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
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if (__generic_dma_ops(dev)->get_sgtable) {
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#if 0
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/*
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* This check verifies that the page belongs to the current domain and
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* is not one mapped from another domain.
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* This check is for debug only, and should not go to production build
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*/
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unsigned long bfn = PHYS_PFN(dma_to_phys(dev, handle));
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BUG_ON (!page_is_ram(bfn));
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#endif
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return __generic_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr,
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handle, size, attrs);
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}
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#endif
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return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size);
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}
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EXPORT_SYMBOL_GPL(xen_swiotlb_get_sgtable);
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@ -2,6 +2,7 @@
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#define __LINUX_SWIOTLB_XEN_H
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#include <linux/dma-direction.h>
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#include <linux/scatterlist.h>
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#include <linux/swiotlb.h>
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extern int xen_swiotlb_init(int verbose, bool early);
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@ -63,4 +64,9 @@ extern int
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xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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extern int
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xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t handle, size_t size,
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unsigned long attrs);
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#endif /* __LINUX_SWIOTLB_XEN_H */
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