From patchwork Sat Jun 18 02:24:46 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 637398 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3rWh0R3lb5z9syB for ; Sat, 18 Jun 2016 12:29:43 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932935AbcFRC0B (ORCPT ); Fri, 17 Jun 2016 22:26:01 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:45156 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754882AbcFRCZn (ORCPT ); Fri, 17 Jun 2016 22:25:43 -0400 Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u5I2PJt7005598 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 18 Jun 2016 02:25:19 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0022.oracle.com (8.14.4/8.13.8) with ESMTP id u5I2PJqA024887 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 18 Jun 2016 02:25:19 GMT Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id u5I2PHDr000924; Sat, 18 Jun 2016 02:25:17 GMT Received: from userv0022.oracle.com (/10.132.126.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 17 Jun 2016 19:25:17 -0700 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Linus Torvalds Cc: Wei Yang , Khalid Aziz , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu , linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org Subject: [PATCH v13 01/16] PCI: Let pci_mmap_page_range() take resource address Date: Fri, 17 Jun 2016 19:24:46 -0700 Message-Id: <20160618022501.15648-2-yinghai@kernel.org> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160618022501.15648-1-yinghai@kernel.org> References: <20160618022501.15648-1-yinghai@kernel.org> X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org In 8c05cd08a7 ("PCI: fix offset check for sysfs mmapped files"), try to check exposed value with resource start/end in proc mmap path. | start = vma->vm_pgoff; | size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; | pci_start = (mmap_api == PCI_MMAP_PROCFS) ? | pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0; | if (start >= pci_start && start < pci_start + size && | start + nr <= pci_start + size) That breaks sparc that exposed value is BAR value, and need to be offseted to resource address. Original pci_mmap_page_range() is taking PCI BAR value aka usr_address. Bjorn found out that it would be much simple to pass resource address directly and avoid extra those __pci_mmap_make_offset. In this patch: 1. in proc path: proc_bus_pci_mmap, try convert back to resource before calling pci_mmap_page_range 2. in sysfs path: pci_mmap_resource will just offset with resource start. 3. all pci_mmap_page_range will have vma->vm_pgoff with in resource range instead of BAR value. 4. skip calling __pci_mmap_make_offset, as the checking is done in pci_mmap_fits(). -v2: add pci_user_to_resource and remove __pci_mmap_make_offset -v3: pass resource pointer with pci_mmap_page_range() -v4: put __pci_mmap_make_offset() removing to following patch seperate /sys io access alignment checking to another patch updated after Bjorn's pci_resource_to_user() changes. Signed-off-by: Yinghai Lu Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org --- arch/microblaze/pci/pci-common.c | 11 +++++--- arch/powerpc/kernel/pci-common.c | 11 +++++--- arch/sparc/kernel/pci.c | 4 --- arch/xtensa/kernel/pci.c | 13 +++++++-- drivers/pci/pci-sysfs.c | 23 +++++++++------ drivers/pci/pci.h | 2 +- drivers/pci/proc.c | 60 ++++++++++++++++++++++++++++++++++------ 7 files changed, 91 insertions(+), 33 deletions(-) diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c index 81556b8..9e3bc05 100644 --- a/arch/microblaze/pci/pci-common.c +++ b/arch/microblaze/pci/pci-common.c @@ -282,12 +282,15 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, { resource_size_t offset = ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; - struct resource *rp; int ret; - rp = __pci_mmap_make_offset(dev, &offset, mmap_state); - if (rp == NULL) - return -EINVAL; + if (mmap_state == pci_mmap_io) { + struct pci_controller *hose = pci_bus_to_host(dev->bus); + + /* hose should never be NULL */ + offset += hose->io_base_phys - + ((unsigned long)hose->io_base_virt - _IO_BASE); + } vma->vm_pgoff = offset >> PAGE_SHIFT; vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 6de6e0e..53ba098 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -420,12 +420,15 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, { resource_size_t offset = ((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT; - struct resource *rp; int ret; - rp = __pci_mmap_make_offset(dev, &offset, mmap_state); - if (rp == NULL) - return -EINVAL; + if (mmap_state == pci_mmap_io) { + struct pci_controller *hose = pci_bus_to_host(dev->bus); + + /* hose should never be NULL */ + offset += hose->io_base_phys - + ((unsigned long)hose->io_base_virt - _IO_BASE); + } vma->vm_pgoff = offset >> PAGE_SHIFT; if (write_combine) diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index 9c1878f..5f2d78e 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -868,10 +868,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, { int ret; - ret = __pci_mmap_make_offset(dev, vma, mmap_state); - if (ret < 0) - return ret; - __pci_mmap_set_pgprot(dev, vma, mmap_state); vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c index b848cc3..4c5f1fa 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -366,11 +366,18 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, enum pci_mmap_state mmap_state, int write_combine) { + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; int ret; - ret = __pci_mmap_make_offset(dev, vma, mmap_state); - if (ret < 0) - return ret; + if (mmap_state == pci_mmap_io) { + struct pci_controller *pci_ctrl = + (struct pci_controller *)dev->sysdata; + + /* pci_ctrl should never be NULL */ + offset += pci_ctrl->io_space.start - pci_ctrl->io_space.base; + } + + vma->vm_pgoff = offset >> PAGE_SHIFT; __pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine); diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index d319a9c..82b98dd 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -967,12 +967,23 @@ void pci_remove_legacy_files(struct pci_bus *b) #ifdef HAVE_PCI_MMAP int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, + enum pci_mmap_state mmap_type, enum pci_mmap_api mmap_api) { unsigned long nr, start, size, pci_start; + int flags; if (pci_resource_len(pdev, resno) == 0) return 0; + + if (mmap_type == pci_mmap_mem) + flags = IORESOURCE_MEM; + else + flags = IORESOURCE_IO; + + if (!(pci_resource_flags(pdev, resno) & flags)) + return 0; + nr = vma_pages(vma); start = vma->vm_pgoff; size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; @@ -999,7 +1010,6 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); struct resource *res = attr->private; enum pci_mmap_state mmap_type; - resource_size_t start, end; int i; for (i = 0; i < PCI_ROM_RESOURCE; i++) @@ -1011,7 +1021,8 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) return -EINVAL; - if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) { + mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; + if (!pci_mmap_fits(pdev, i, vma, mmap_type, PCI_MMAP_SYSFS)) { WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n", current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, pci_name(pdev), i, @@ -1020,13 +1031,7 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, return -EINVAL; } - /* pci_mmap_page_range() expects the same kind of entry as coming - * from /proc/bus/pci/ which is a "user visible" value. If this is - * different from the resource itself, arch will do necessary fixup. - */ - pci_resource_to_user(pdev, i, res, &start, &end); - vma->vm_pgoff += start >> PAGE_SHIFT; - mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; + vma->vm_pgoff += res->start >> PAGE_SHIFT; return pci_mmap_page_range(pdev, vma, mmap_type, write_combine); } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index a814bbb..7d339c3 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -30,7 +30,7 @@ enum pci_mmap_api { PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/ */ }; int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai, - enum pci_mmap_api mmap_api); + enum pci_mmap_state mmap_type, enum pci_mmap_api mmap_api); #endif int pci_probe_reset_function(struct pci_dev *dev); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 2408abe..fadab8a 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -227,24 +227,68 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, } #ifdef HAVE_PCI_MMAP + +static int pci_user_to_resource(struct pci_dev *dev, resource_size_t *offset, + int flags) +{ + int i; + + for (i = 0; i < PCI_ROM_RESOURCE; i++) { + resource_size_t start, end; + struct resource *res = &dev->resource[i]; + + if (!(res->flags & flags)) + continue; + + if (pci_resource_len(dev, i) == 0) + continue; + + /* + * here *offset is PAGE_SIZE aligned from caller. + * need align start/end for io port resource that is + * usually not PAGE_SIZE aligned. + * that means we let it go if they falls in same page. + */ + pci_resource_to_user(dev, i, res, &start, &end); + if ((start & PAGE_MASK) <= *offset && + *offset <= (end & PAGE_MASK)) { + *offset = res->start + (*offset - start); + return i; + } + } + + return -ENODEV; +} + static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) { struct pci_dev *dev = PDE_DATA(file_inode(file)); struct pci_filp_private *fpriv = file->private_data; - int i, ret, write_combine; + resource_size_t offset; + int i, ret, flags, write_combine; if (!capable(CAP_SYS_RAWIO)) return -EPERM; - /* Make sure the caller is mapping a real resource for this device */ - for (i = 0; i < PCI_ROM_RESOURCE; i++) { - if (pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) - break; - } - - if (i >= PCI_ROM_RESOURCE) + offset = vma->vm_pgoff << PAGE_SHIFT; + if (fpriv->mmap_state == pci_mmap_mem) + flags = IORESOURCE_MEM; + else + flags = IORESOURCE_IO; + i = pci_user_to_resource(dev, &offset, flags); + if (i < 0) return -ENODEV; + vma->vm_pgoff = offset >> PAGE_SHIFT; + if (!pci_mmap_fits(dev, i, vma, fpriv->mmap_state, PCI_MMAP_PROCFS)) { + WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n", + current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff, + pci_name(dev), i, + (u64)pci_resource_start(dev, i), + (u64)pci_resource_len(dev, i)); + return -EINVAL; + } + if (fpriv->mmap_state == pci_mmap_mem) write_combine = fpriv->write_combine; else