Commit a383dcb1 authored by Oleksandr Tyshchenko's avatar Oleksandr Tyshchenko Committed by Juergen Gross
Browse files

xen/virtio: Convert PAGE_SIZE/PAGE_SHIFT/PFN_UP to Xen counterparts 



Currently, a grant ref is always based on the Xen page granularity
(4KB), and guest commonly uses the same page granularity.
But the guest may use a different page granularity (i.e 64KB).
So adopt the code to be able to deal with it.

Signed-off-by: default avatarOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Acked-by: default avatarStefano Stabellini <sstabellini@kernel.org>
Reviewed-by: default avatarXenia Ragiadakou <burzalodowa@gmail.com>
Link: https://lore.kernel.org/r/20221008151013.2537826-3-olekstysh@gmail.com


Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 875553e3

drivers/xen/grant-dma-ops.c

+12 −12
Original line number Diff line number Diff line
@@ -31,12 +31,12 @@ static DEFINE_XARRAY_FLAGS(xen_grant_dma_devices, XA_FLAGS_LOCK_IRQ); 


static inline dma_addr_t grant_to_dma(grant_ref_t grant)

{

	return XEN_GRANT_DMA_ADDR_OFF | ((dma_addr_t)grant << PAGE_SHIFT);

	return XEN_GRANT_DMA_ADDR_OFF | ((dma_addr_t)grant << XEN_PAGE_SHIFT);

}



static inline grant_ref_t dma_to_grant(dma_addr_t dma)

{

	return (grant_ref_t)((dma & ~XEN_GRANT_DMA_ADDR_OFF) >> PAGE_SHIFT);

	return (grant_ref_t)((dma & ~XEN_GRANT_DMA_ADDR_OFF) >> XEN_PAGE_SHIFT);

}



static struct xen_grant_dma_data *find_xen_grant_dma_data(struct device *dev)
@@ -79,7 +79,7 @@ static void *xen_grant_dma_alloc(struct device *dev, size_t size, 
				 unsigned long attrs)

{

	struct xen_grant_dma_data *data;

	unsigned int i, n_pages = PFN_UP(size);

	unsigned int i, n_pages = XEN_PFN_UP(size);

	unsigned long pfn;

	grant_ref_t grant;

	void *ret;
@@ -91,14 +91,14 @@ static void *xen_grant_dma_alloc(struct device *dev, size_t size, 
	if (unlikely(data->broken))

		return NULL;



	ret = alloc_pages_exact(n_pages * PAGE_SIZE, gfp);

	ret = alloc_pages_exact(n_pages * XEN_PAGE_SIZE, gfp);

	if (!ret)

		return NULL;



	pfn = virt_to_pfn(ret);



	if (gnttab_alloc_grant_reference_seq(n_pages, &grant)) {

		free_pages_exact(ret, n_pages * PAGE_SIZE);

		free_pages_exact(ret, n_pages * XEN_PAGE_SIZE);

		return NULL;

	}
@@ -116,7 +116,7 @@ static void xen_grant_dma_free(struct device *dev, size_t size, void *vaddr, 
			       dma_addr_t dma_handle, unsigned long attrs)

{

	struct xen_grant_dma_data *data;

	unsigned int i, n_pages = PFN_UP(size);

	unsigned int i, n_pages = XEN_PFN_UP(size);

	grant_ref_t grant;



	data = find_xen_grant_dma_data(dev);
@@ -138,7 +138,7 @@ static void xen_grant_dma_free(struct device *dev, size_t size, void *vaddr, 


	gnttab_free_grant_reference_seq(grant, n_pages);



	free_pages_exact(vaddr, n_pages * PAGE_SIZE);

	free_pages_exact(vaddr, n_pages * XEN_PAGE_SIZE);

}



static struct page *xen_grant_dma_alloc_pages(struct device *dev, size_t size,
@@ -168,9 +168,9 @@ static dma_addr_t xen_grant_dma_map_page(struct device *dev, struct page *page, 
					 unsigned long attrs)

{

	struct xen_grant_dma_data *data;

	unsigned long dma_offset = offset_in_page(offset),

			pfn_offset = PFN_DOWN(offset);

	unsigned int i, n_pages = PFN_UP(dma_offset + size);

	unsigned long dma_offset = xen_offset_in_page(offset),

			pfn_offset = XEN_PFN_DOWN(offset);

	unsigned int i, n_pages = XEN_PFN_UP(dma_offset + size);

	grant_ref_t grant;

	dma_addr_t dma_handle;
@@ -203,8 +203,8 @@ static void xen_grant_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, 
				     unsigned long attrs)

{

	struct xen_grant_dma_data *data;

	unsigned long offset = dma_handle & (PAGE_SIZE - 1);

	unsigned int i, n_pages = PFN_UP(offset + size);

	unsigned long dma_offset = xen_offset_in_page(dma_handle);

	unsigned int i, n_pages = XEN_PFN_UP(dma_offset + size);

	grant_ref_t grant;



	if (WARN_ON(dir == DMA_NONE))