linux-kernel - [PATCH] xen/virtio: Convert PAGE_SIZE/PAGE_SHIFT/PFN

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Date:   Thu,  6 Oct 2022 15:09:12 +0300
From:   Oleksandr Tyshchenko <olekstysh@...il.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Xenia Ragiadakou <burzalodowa@...il.com>
Subject: [PATCH] xen/virtio: Convert PAGE_SIZE/PAGE_SHIFT/PFN_UP to Xen counterparts

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>

Although XEN_PAGE_SIZE is equal to PAGE_SIZE (4KB) for now, it would
be more correct to use Xen specific #define-s as XEN_PAGE_SIZE can
be changed at some point in the future.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
---
Cc: Juergen Gross <jgross@...e.com>
Cc: Xenia Ragiadakou <burzalodowa@...il.com>

As it was proposed at:
https://lore.kernel.org/xen-devel/20221005174823.1800761-1-olekstysh@gmail.com/

Should go in only after that series.
---
 drivers/xen/grant-dma-ops.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
index c66f56d24013..5392fdc25dca 100644
--- a/drivers/xen/grant-dma-ops.c
+++ b/drivers/xen/grant-dma-ops.c
@@ -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,
@@ -168,7 +168,7 @@ 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 int i, n_pages = PFN_UP(offset + size);
+	unsigned int i, n_pages = XEN_PFN_UP(offset + size);
 	grant_ref_t grant;
 	dma_addr_t dma_handle;
 
@@ -200,8 +200,8 @@ 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 offset = dma_handle & ~XEN_PAGE_MASK;
+	unsigned int i, n_pages = XEN_PFN_UP(offset + size);
 	grant_ref_t grant;
 
 	if (WARN_ON(dir == DMA_NONE))
-- 
2.25.1