From: Stefano Stabellini <sstabellini@kernel.org> To: jgross@suse.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com Cc: sstabellini@kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, hch@infradead.org, Stefano Stabellini <stefano.stabellini@xilinx.com> Subject: [PATCH v3 01/11] swiotlb-xen: use vmalloc_to_page on vmalloc virt addresses Date: Fri, 10 Jul 2020 15:34:17 -0700 [thread overview] Message-ID: <20200710223427.6897-1-sstabellini@kernel.org> (raw) In-Reply-To: <alpine.DEB.2.21.2007101521290.4124@sstabellini-ThinkPad-T480s> From: Boris Ostrovsky <boris.ostrovsky@oracle.com> xen_alloc_coherent_pages might return pages for which virt_to_phys and virt_to_page don't work, e.g. ioremap'ed pages. So in xen_swiotlb_free_coherent we can't assume that virt_to_page works. Instead add a is_vmalloc_addr check and use vmalloc_to_page on vmalloc virt addresses. This patch fixes the following crash at boot on RPi4 (the underlying issue is not RPi4 specific): https://marc.info/?l=xen-devel&m=158862573216800 Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Tested-by: Corey Minyard <cminyard@mvista.com> Tested-by: Roman Shaposhnik <roman@zededa.com> --- Changes in v3: - style improvements Changes in v2: - update commit message --- drivers/xen/swiotlb-xen.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index b6d27762c6f8..5fbadd07819b 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -335,6 +335,7 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, int order = get_order(size); phys_addr_t phys; u64 dma_mask = DMA_BIT_MASK(32); + struct page *page; if (hwdev && hwdev->coherent_dma_mask) dma_mask = hwdev->coherent_dma_mask; @@ -346,9 +347,14 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, /* Convert the size to actually allocated. */ size = 1UL << (order + XEN_PAGE_SHIFT); + if (is_vmalloc_addr(vaddr)) + page = vmalloc_to_page(vaddr); + else + page = virt_to_page(vaddr); + if (!WARN_ON((dev_addr + size - 1 > dma_mask) || range_straddles_page_boundary(phys, size)) && - TestClearPageXenRemapped(virt_to_page(vaddr))) + TestClearPageXenRemapped(page)) xen_destroy_contiguous_region(phys, order); xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs); -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Stabellini <sstabellini@kernel.org> To: jgross@suse.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com Cc: hch@infradead.org, xen-devel@lists.xenproject.org, sstabellini@kernel.org, linux-kernel@vger.kernel.org, Stefano Stabellini <stefano.stabellini@xilinx.com> Subject: [PATCH v3 01/11] swiotlb-xen: use vmalloc_to_page on vmalloc virt addresses Date: Fri, 10 Jul 2020 15:34:17 -0700 [thread overview] Message-ID: <20200710223427.6897-1-sstabellini@kernel.org> (raw) In-Reply-To: <alpine.DEB.2.21.2007101521290.4124@sstabellini-ThinkPad-T480s> From: Boris Ostrovsky <boris.ostrovsky@oracle.com> xen_alloc_coherent_pages might return pages for which virt_to_phys and virt_to_page don't work, e.g. ioremap'ed pages. So in xen_swiotlb_free_coherent we can't assume that virt_to_page works. Instead add a is_vmalloc_addr check and use vmalloc_to_page on vmalloc virt addresses. This patch fixes the following crash at boot on RPi4 (the underlying issue is not RPi4 specific): https://marc.info/?l=xen-devel&m=158862573216800 Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Tested-by: Corey Minyard <cminyard@mvista.com> Tested-by: Roman Shaposhnik <roman@zededa.com> --- Changes in v3: - style improvements Changes in v2: - update commit message --- drivers/xen/swiotlb-xen.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index b6d27762c6f8..5fbadd07819b 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -335,6 +335,7 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, int order = get_order(size); phys_addr_t phys; u64 dma_mask = DMA_BIT_MASK(32); + struct page *page; if (hwdev && hwdev->coherent_dma_mask) dma_mask = hwdev->coherent_dma_mask; @@ -346,9 +347,14 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, /* Convert the size to actually allocated. */ size = 1UL << (order + XEN_PAGE_SHIFT); + if (is_vmalloc_addr(vaddr)) + page = vmalloc_to_page(vaddr); + else + page = virt_to_page(vaddr); + if (!WARN_ON((dev_addr + size - 1 > dma_mask) || range_straddles_page_boundary(phys, size)) && - TestClearPageXenRemapped(virt_to_page(vaddr))) + TestClearPageXenRemapped(page)) xen_destroy_contiguous_region(phys, order); xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs); -- 2.17.1
next prev parent reply other threads:[~2020-07-10 22:34 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-10 22:34 [PATCH v3 00/11] fix swiotlb-xen for RPi4 Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini [this message] 2020-07-10 22:34 ` [PATCH v3 01/11] swiotlb-xen: use vmalloc_to_page on vmalloc virt addresses Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 02/11] swiotlb-xen: remove start_dma_addr Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 03/11] swiotlb-xen: add struct device * parameter to xen_phys_to_bus Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 04/11] swiotlb-xen: add struct device * parameter to xen_bus_to_phys Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 05/11] swiotlb-xen: add struct device * parameter to xen_dma_sync_for_cpu Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 06/11] swiotlb-xen: add struct device * parameter to xen_dma_sync_for_device Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 07/11] swiotlb-xen: add struct device * parameter to is_xen_swiotlb_buffer Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-07-10 22:34 ` [PATCH v3 08/11] swiotlb-xen: remove XEN_PFN_PHYS Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-08-04 5:33 ` Jürgen Groß 2020-08-04 5:33 ` Jürgen Groß 2020-07-10 22:34 ` [PATCH v3 09/11] swiotlb-xen: introduce phys_to_dma/dma_to_phys translations Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-08-04 5:34 ` Jürgen Groß 2020-08-04 5:34 ` Jürgen Groß 2020-07-10 22:34 ` [PATCH v3 10/11] xen/arm: introduce phys/dma translations in xen_dma_sync_for_* Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-08-04 5:35 ` Jürgen Groß 2020-08-04 5:35 ` Jürgen Groß 2020-07-10 22:34 ` [PATCH v3 11/11] xen/arm: call dma_to_phys on the dma_addr_t parameter of dma_cache_maint Stefano Stabellini 2020-07-10 22:34 ` Stefano Stabellini 2020-08-04 5:56 ` [PATCH v3 00/11] fix swiotlb-xen for RPi4 Jürgen Groß 2020-08-04 5:56 ` Jürgen Groß 2020-08-04 15:52 ` Stefano Stabellini 2020-08-04 15:52 ` Stefano Stabellini
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