From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [PATCH 2/3] pci: Add arch_can_pci_mmap_wc() macro Date: Wed, 15 Mar 2017 17:17:56 +0000 Message-ID: <1489598276.86622.13.camel@infradead.org> References: <0e5266c6c883baa0e4a98dce796f8ab2ee18e71f.1489598108.git.dwmw2@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-dI495LjDknZDXmFC69/O" Return-path: In-Reply-To: <0e5266c6c883baa0e4a98dce796f8ab2ee18e71f.1489598108.git.dwmw2@infradead.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org List-Id: linux-arch.vger.kernel.org --=-dI495LjDknZDXmFC69/O Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Most of the almost-identical versions of pci_mmap_page_range() silently ignore the 'write_combine' argument and give uncached mappings. Yet we allow the PCIIOC_WRITE_COMBINE ioctl in /proc/bus/pci, expose the 'resourceX_wc' file in sysfs, and allow an attempted mapping to apparently succeed. To fix this, introduce a macro arch_can_pci_mmap_wc() which indicates whether the platform can do a write-combining mapping. On x86 this ends up being pat_enabled(), while the few other platforms that support it can just set it to a literal '1'. Signed-off-by: David Woodhouse --- Documentation/filesystems/sysfs-pci.txt | 4 ++++ arch/arm64/include/asm/pci.h | 1 + arch/ia64/include/asm/pci.h | 2 ++ arch/powerpc/include/asm/pci.h | 5 +++-- arch/x86/include/asm/pci.h | 2 ++ arch/xtensa/include/asm/pci.h | 6 +++++- arch/xtensa/kernel/pci.c | 2 +- drivers/pci/pci-sysfs.c | 6 ++++-- drivers/pci/proc.c | 17 ++++++++++------- 9 files changed, 32 insertions(+), 13 deletions(-) diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesy= stems/sysfs-pci.txt index 6ea1ced..25b7f1c 100644 --- a/Documentation/filesystems/sysfs-pci.txt +++ b/Documentation/filesystems/sysfs-pci.txt @@ -117,6 +117,10 @@ code must define HAVE_PCI_MMAP and provide a pci_mmap_= page_range function. Platforms are free to only support subsets of the mmap functionality, but useful return codes should be provided. =20 +Platforms which support write-combining maps of PCI resources must define +arch_can_pci_mmap_wc() which shall evaluate to non-zero at runtime when +write-combining is permitted. + Legacy resources are protected by the HAVE_PCI_LEGACY define. Platforms wishing to support legacy functionality should define it and provide pci_legacy_read, pci_legacy_write and pci_mmap_legacy_page_range functions= . diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h index f73734f..53b1541 100644 --- a/arch/arm64/include/asm/pci.h +++ b/arch/arm64/include/asm/pci.h @@ -38,6 +38,7 @@ static inline int pci_proc_domain(struct pci_bus *bus) #endif /* CONFIG_PCI */ =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() 1 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct = *vma, enum pci_mmap_state mmap_state, int write_combine); =20 diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h index c0835b0..6283758 100644 --- a/arch/ia64/include/asm/pci.h +++ b/arch/ia64/include/asm/pci.h @@ -51,6 +51,8 @@ extern unsigned long ia64_max_iommu_merge_mask; #define PCI_DMA_BUS_IS_PHYS (ia64_max_iommu_merge_mask =3D=3D ~0UL) =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() 1 + extern int pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct= *vma, enum pci_mmap_state mmap_state, int write_combine); #define HAVE_PCI_LEGACY diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.= h index 93eded8..b5b68c6 100644 --- a/arch/powerpc/include/asm/pci.h +++ b/arch/powerpc/include/asm/pci.h @@ -81,8 +81,9 @@ struct vm_area_struct; int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine); =20 -/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */ -#define HAVE_PCI_MMAP 1 +/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() and it does = WC */ +#define HAVE_PCI_MMAP 1 +#define arch_can_pci_mmap_wc() 1 =20 extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t count); diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index 1411dbe..f6e22c2 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -7,6 +7,7 @@ #include #include #include +#include #include =20 #ifdef __KERNEL__ @@ -102,6 +103,7 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pi= n, int irq); =20 =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() pat_enabled() extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct = *vma, enum pci_mmap_state mmap_state, int write_combine); diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h index 5d6bd93..f106879 100644 --- a/arch/xtensa/include/asm/pci.h +++ b/arch/xtensa/include/asm/pci.h @@ -51,7 +51,11 @@ int pci_mmap_page_range(struct pci_dev *pdev, struct vm_= area_struct *vma, enum pci_mmap_state mmap_state, int write_combine); =20 /* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */ -#define HAVE_PCI_MMAP 1 +#define HAVE_PCI_MMAP 1 + +/* This was wrapped in #if 0 since the first merge of xtensa support... +#define arch_can_pci_mmap_wc() 1 +*/ =20 #endif /* __KERNEL__ */ =20 diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c index b848cc3..c5944d3 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -345,7 +345,7 @@ __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_ar= ea_struct *vma, =20 /* Set to write-through */ prot =3D (prot & _PAGE_CA_MASK) | _PAGE_CA_WT; -#if 0 +#ifdef arch_can_pci_mmap_wc if (!write_combine) prot |=3D _PAGE_WRITETHRU; #endif diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 25d010d..e0474f3 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1206,10 +1206,12 @@ static int pci_create_resource_files(struct pci_dev= *pdev) continue; =20 retval =3D pci_create_attr(pdev, i, 0); +#ifdef arch_can_pci_mmap_wc /* for prefetchable resources, create a WC mappable file */ - if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) + if (!retval && arch_can_pci_mmap_wc() && + pdev->resource[i].flags & IORESOURCE_PREFETCH) retval =3D pci_create_attr(pdev, i, 1); - +#endif if (retval) { pci_remove_resource_files(pdev); return retval; diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index f82710a..5cd960c 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -209,15 +209,18 @@ static long proc_bus_pci_ioctl(struct file *file, uns= igned int cmd, fpriv->mmap_state =3D pci_mmap_mem; break; =20 +#ifdef arch_can_pci_mmap_wc case PCIIOC_WRITE_COMBINE: - if (arg) - fpriv->write_combine =3D 1; - else - fpriv->write_combine =3D 0; - break; - + if (arch_can_pci_mmap_wc()) { + if (arg) + fpriv->write_combine =3D 1; + else + fpriv->write_combine =3D 0; + break; + } + /* If arch decided it can't, fall through... */ +#endif /* arch_can_pci_mmap_wc */ #endif /* HAVE_PCI_MMAP */ - default: ret =3D -EINVAL; break; --=20 dwmw2 --=-dI495LjDknZDXmFC69/O Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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Subject: [PATCH 2/3] pci: Add arch_can_pci_mmap_wc() macro From: David Woodhouse Date: Wed, 15 Mar 2017 17:17:56 +0000 In-Reply-To: <0e5266c6c883baa0e4a98dce796f8ab2ee18e71f.1489598108.git.dwmw2@infradead.org> References: <0e5266c6c883baa0e4a98dce796f8ab2ee18e71f.1489598108.git.dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-dI495LjDknZDXmFC69/O" Mime-Version: 1.0 Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Message-ID: <20170315171756.F3puVx5X06IT1NdQNdictzwgnZrf2QsTnqAJMsl0ows@z> --=-dI495LjDknZDXmFC69/O Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Most of the almost-identical versions of pci_mmap_page_range() silently ignore the 'write_combine' argument and give uncached mappings. Yet we allow the PCIIOC_WRITE_COMBINE ioctl in /proc/bus/pci, expose the 'resourceX_wc' file in sysfs, and allow an attempted mapping to apparently succeed. To fix this, introduce a macro arch_can_pci_mmap_wc() which indicates whether the platform can do a write-combining mapping. On x86 this ends up being pat_enabled(), while the few other platforms that support it can just set it to a literal '1'. Signed-off-by: David Woodhouse --- Documentation/filesystems/sysfs-pci.txt | 4 ++++ arch/arm64/include/asm/pci.h | 1 + arch/ia64/include/asm/pci.h | 2 ++ arch/powerpc/include/asm/pci.h | 5 +++-- arch/x86/include/asm/pci.h | 2 ++ arch/xtensa/include/asm/pci.h | 6 +++++- arch/xtensa/kernel/pci.c | 2 +- drivers/pci/pci-sysfs.c | 6 ++++-- drivers/pci/proc.c | 17 ++++++++++------- 9 files changed, 32 insertions(+), 13 deletions(-) diff --git a/Documentation/filesystems/sysfs-pci.txt b/Documentation/filesy= stems/sysfs-pci.txt index 6ea1ced..25b7f1c 100644 --- a/Documentation/filesystems/sysfs-pci.txt +++ b/Documentation/filesystems/sysfs-pci.txt @@ -117,6 +117,10 @@ code must define HAVE_PCI_MMAP and provide a pci_mmap_= page_range function. Platforms are free to only support subsets of the mmap functionality, but useful return codes should be provided. =20 +Platforms which support write-combining maps of PCI resources must define +arch_can_pci_mmap_wc() which shall evaluate to non-zero at runtime when +write-combining is permitted. + Legacy resources are protected by the HAVE_PCI_LEGACY define. Platforms wishing to support legacy functionality should define it and provide pci_legacy_read, pci_legacy_write and pci_mmap_legacy_page_range functions= . diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h index f73734f..53b1541 100644 --- a/arch/arm64/include/asm/pci.h +++ b/arch/arm64/include/asm/pci.h @@ -38,6 +38,7 @@ static inline int pci_proc_domain(struct pci_bus *bus) #endif /* CONFIG_PCI */ =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() 1 extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct = *vma, enum pci_mmap_state mmap_state, int write_combine); =20 diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h index c0835b0..6283758 100644 --- a/arch/ia64/include/asm/pci.h +++ b/arch/ia64/include/asm/pci.h @@ -51,6 +51,8 @@ extern unsigned long ia64_max_iommu_merge_mask; #define PCI_DMA_BUS_IS_PHYS (ia64_max_iommu_merge_mask =3D=3D ~0UL) =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() 1 + extern int pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct= *vma, enum pci_mmap_state mmap_state, int write_combine); #define HAVE_PCI_LEGACY diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.= h index 93eded8..b5b68c6 100644 --- a/arch/powerpc/include/asm/pci.h +++ b/arch/powerpc/include/asm/pci.h @@ -81,8 +81,9 @@ struct vm_area_struct; int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine); =20 -/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */ -#define HAVE_PCI_MMAP 1 +/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() and it does = WC */ +#define HAVE_PCI_MMAP 1 +#define arch_can_pci_mmap_wc() 1 =20 extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t count); diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index 1411dbe..f6e22c2 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -7,6 +7,7 @@ #include #include #include +#include #include =20 #ifdef __KERNEL__ @@ -102,6 +103,7 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pi= n, int irq); =20 =20 #define HAVE_PCI_MMAP +#define arch_can_pci_mmap_wc() pat_enabled() extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct = *vma, enum pci_mmap_state mmap_state, int write_combine); diff --git a/arch/xtensa/include/asm/pci.h b/arch/xtensa/include/asm/pci.h index 5d6bd93..f106879 100644 --- a/arch/xtensa/include/asm/pci.h +++ b/arch/xtensa/include/asm/pci.h @@ -51,7 +51,11 @@ int pci_mmap_page_range(struct pci_dev *pdev, struct vm_= area_struct *vma, enum pci_mmap_state mmap_state, int write_combine); =20 /* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */ -#define HAVE_PCI_MMAP 1 +#define HAVE_PCI_MMAP 1 + +/* This was wrapped in #if 0 since the first merge of xtensa support... +#define arch_can_pci_mmap_wc() 1 +*/ =20 #endif /* __KERNEL__ */ =20 diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c index b848cc3..c5944d3 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -345,7 +345,7 @@ __pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_ar= ea_struct *vma, =20 /* Set to write-through */ prot =3D (prot & _PAGE_CA_MASK) | _PAGE_CA_WT; -#if 0 +#ifdef arch_can_pci_mmap_wc if (!write_combine) prot |=3D _PAGE_WRITETHRU; #endif diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 25d010d..e0474f3 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1206,10 +1206,12 @@ static int pci_create_resource_files(struct pci_dev= *pdev) continue; =20 retval =3D pci_create_attr(pdev, i, 0); +#ifdef arch_can_pci_mmap_wc /* for prefetchable resources, create a WC mappable file */ - if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH) + if (!retval && arch_can_pci_mmap_wc() && + pdev->resource[i].flags & IORESOURCE_PREFETCH) retval =3D pci_create_attr(pdev, i, 1); - +#endif if (retval) { pci_remove_resource_files(pdev); return retval; diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index f82710a..5cd960c 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -209,15 +209,18 @@ static long proc_bus_pci_ioctl(struct file *file, uns= igned int cmd, fpriv->mmap_state =3D pci_mmap_mem; break; =20 +#ifdef arch_can_pci_mmap_wc case PCIIOC_WRITE_COMBINE: - if (arg) - fpriv->write_combine =3D 1; - else - fpriv->write_combine =3D 0; - break; - + if (arch_can_pci_mmap_wc()) { + if (arg) + fpriv->write_combine =3D 1; + else + fpriv->write_combine =3D 0; + break; + } + /* If arch decided it can't, fall through... */ +#endif /* arch_can_pci_mmap_wc */ #endif /* HAVE_PCI_MMAP */ - default: ret =3D -EINVAL; break; --=20 dwmw2 --=-dI495LjDknZDXmFC69/O Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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