From patchwork Tue Jun 7 18:08:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 9162189 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D81DE60467 for ; Tue, 7 Jun 2016 18:09:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CE0702824F for ; Tue, 7 Jun 2016 18:09:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C220128350; Tue, 7 Jun 2016 18:09:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6515225D91 for ; Tue, 7 Jun 2016 18:09:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161649AbcFGSJ2 (ORCPT ); Tue, 7 Jun 2016 14:09:28 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:25890 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161552AbcFGSJ0 (ORCPT ); Tue, 7 Jun 2016 14:09:26 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u57I946s027345 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 7 Jun 2016 18:09:04 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u57I9380017075 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 7 Jun 2016 18:09:03 GMT Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by aserv0122.oracle.com (8.13.8/8.13.8) with ESMTP id u57I92iW007593; Tue, 7 Jun 2016 18:09:02 GMT Received: from userv0022.oracle.com (/10.132.126.127) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 07 Jun 2016 11:09:02 -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 v12.update 02/15] PCI: Let pci_mmap_page_range() take resource address Date: Tue, 7 Jun 2016 11:08:47 -0700 Message-Id: <20160607180847.15205-2-yinghai@kernel.org> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160607180847.15205-1-yinghai@kernel.org> References: <20160607180847.15205-1-yinghai@kernel.org> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. remove __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() update for fixing bisectibility problem found by build test robot. 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 | 80 +++----------------------- arch/powerpc/kernel/pci-common.c | 80 +++----------------------- arch/sparc/kernel/pci.c | 117 --------------------------------------- arch/xtensa/kernel/pci.c | 75 ++++--------------------- drivers/pci/pci-sysfs.c | 33 ++++++++--- drivers/pci/pci.h | 2 +- drivers/pci/proc.c | 63 ++++++++++++++++++--- 7 files changed, 107 insertions(+), 343 deletions(-) diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c index fd2b013..9471383 100644 --- a/arch/microblaze/pci/pci-common.c +++ b/arch/microblaze/pci/pci-common.c @@ -156,69 +156,6 @@ void pcibios_set_master(struct pci_dev *dev) */ /* - * Adjust vm_pgoff of VMA such that it is the physical page offset - * corresponding to the 32-bit pci bus offset for DEV requested by the user. - * - * Basically, the user finds the base address for his device which he wishes - * to mmap. They read the 32-bit value from the config space base register, - * add whatever PAGE_SIZE multiple offset they wish, and feed this into the - * offset parameter of mmap on /proc/bus/pci/XXX for that device. - * - * Returns negative error code on failure, zero on success. - */ -static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, - resource_size_t *offset, - enum pci_mmap_state mmap_state) -{ - struct pci_controller *hose = pci_bus_to_host(dev->bus); - unsigned long io_offset = 0; - int i, res_bit; - - if (!hose) - return NULL; /* should never happen */ - - /* If memory, add on the PCI bridge address offset */ - if (mmap_state == pci_mmap_mem) { -#if 0 /* See comment in pci_resource_to_user() for why this is disabled */ - *offset += hose->pci_mem_offset; -#endif - res_bit = IORESOURCE_MEM; - } else { - io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; - *offset += io_offset; - res_bit = IORESOURCE_IO; - } - - /* - * Check that the offset requested corresponds to one of the - * resources of the device. - */ - for (i = 0; i <= PCI_ROM_RESOURCE; i++) { - struct resource *rp = &dev->resource[i]; - int flags = rp->flags; - - /* treat ROM as memory (should be already) */ - if (i == PCI_ROM_RESOURCE) - flags |= IORESOURCE_MEM; - - /* Active and same type? */ - if ((flags & res_bit) == 0) - continue; - - /* In the range of this resource? */ - if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) - continue; - - /* found it! construct the final physical address */ - if (mmap_state == pci_mmap_io) - *offset += hose->io_base_phys - io_offset; - return rp; - } - - return NULL; -} - -/* * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ @@ -310,15 +247,18 @@ int pci_mmap_page_range(struct pci_dev *dev, struct resource *res, { 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 = __pci_mmap_set_pgprot(dev, rp, + vma->vm_page_prot = __pci_mmap_set_pgprot(dev, res, vma->vm_page_prot, mmap_state, write_combine); @@ -494,9 +434,7 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar, * * Hopefully, the sysfs insterface is immune to that gunk. Once X * has been fixed (and the fix spread enough), we can re-enable the - * 2 lines below and pass down a BAR value to userland. In that case - * we'll also have to re-enable the matching code in - * __pci_mmap_make_offset(). + * 2 lines below and pass down a BAR value to userland. * * BenH. */ diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 1596362..c38e842 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -293,69 +293,6 @@ static int pci_read_irq_line(struct pci_dev *pci_dev) */ /* - * Adjust vm_pgoff of VMA such that it is the physical page offset - * corresponding to the 32-bit pci bus offset for DEV requested by the user. - * - * Basically, the user finds the base address for his device which he wishes - * to mmap. They read the 32-bit value from the config space base register, - * add whatever PAGE_SIZE multiple offset they wish, and feed this into the - * offset parameter of mmap on /proc/bus/pci/XXX for that device. - * - * Returns negative error code on failure, zero on success. - */ -static struct resource *__pci_mmap_make_offset(struct pci_dev *dev, - resource_size_t *offset, - enum pci_mmap_state mmap_state) -{ - struct pci_controller *hose = pci_bus_to_host(dev->bus); - unsigned long io_offset = 0; - int i, res_bit; - - if (hose == NULL) - return NULL; /* should never happen */ - - /* If memory, add on the PCI bridge address offset */ - if (mmap_state == pci_mmap_mem) { -#if 0 /* See comment in pci_resource_to_user() for why this is disabled */ - *offset += hose->pci_mem_offset; -#endif - res_bit = IORESOURCE_MEM; - } else { - io_offset = (unsigned long)hose->io_base_virt - _IO_BASE; - *offset += io_offset; - res_bit = IORESOURCE_IO; - } - - /* - * Check that the offset requested corresponds to one of the - * resources of the device. - */ - for (i = 0; i <= PCI_ROM_RESOURCE; i++) { - struct resource *rp = &dev->resource[i]; - int flags = rp->flags; - - /* treat ROM as memory (should be already) */ - if (i == PCI_ROM_RESOURCE) - flags |= IORESOURCE_MEM; - - /* Active and same type? */ - if ((flags & res_bit) == 0) - continue; - - /* In the range of this resource? */ - if (*offset < (rp->start & PAGE_MASK) || *offset > rp->end) - continue; - - /* found it! construct the final physical address */ - if (mmap_state == pci_mmap_io) - *offset += hose->io_base_phys - io_offset; - return rp; - } - - return NULL; -} - -/* * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ @@ -451,15 +388,18 @@ int pci_mmap_page_range(struct pci_dev *dev, struct resource *res, { 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 = __pci_mmap_set_pgprot(dev, rp, + vma->vm_page_prot = __pci_mmap_set_pgprot(dev, res, vma->vm_page_prot, mmap_state, write_combine); @@ -631,9 +571,7 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar, * * Hopefully, the sysfs insterface is immune to that gunk. Once X * has been fixed (and the fix spread enough), we can re-enable the - * 2 lines below and pass down a BAR value to userland. In that case - * we'll also have to re-enable the matching code in - * __pci_mmap_make_offset(). + * 2 lines below and pass down a BAR value to userland. * * BenH. */ diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c index 86d7dda..4dbdad4 100644 --- a/arch/sparc/kernel/pci.c +++ b/arch/sparc/kernel/pci.c @@ -732,119 +732,6 @@ int pcibios_enable_device(struct pci_dev *dev, int mask) /* Platform support for /proc/bus/pci/X/Y mmap()s. */ -/* If the user uses a host-bridge as the PCI device, he may use - * this to perform a raw mmap() of the I/O or MEM space behind - * that controller. - * - * This can be useful for execution of x86 PCI bios initialization code - * on a PCI card, like the xfree86 int10 stuff does. - */ -static int __pci_mmap_make_offset_bus(struct pci_dev *pdev, struct vm_area_struct *vma, - enum pci_mmap_state mmap_state) -{ - struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller; - unsigned long space_size, user_offset, user_size; - - if (mmap_state == pci_mmap_io) { - space_size = resource_size(&pbm->io_space); - } else { - space_size = resource_size(&pbm->mem_space); - } - - /* Make sure the request is in range. */ - user_offset = vma->vm_pgoff << PAGE_SHIFT; - user_size = vma->vm_end - vma->vm_start; - - if (user_offset >= space_size || - (user_offset + user_size) > space_size) - return -EINVAL; - - if (mmap_state == pci_mmap_io) { - vma->vm_pgoff = (pbm->io_space.start + - user_offset) >> PAGE_SHIFT; - } else { - vma->vm_pgoff = (pbm->mem_space.start + - user_offset) >> PAGE_SHIFT; - } - - return 0; -} - -/* Adjust vm_pgoff of VMA such that it is the physical page offset - * corresponding to the 32-bit pci bus offset for DEV requested by the user. - * - * Basically, the user finds the base address for his device which he wishes - * to mmap. They read the 32-bit value from the config space base register, - * add whatever PAGE_SIZE multiple offset they wish, and feed this into the - * offset parameter of mmap on /proc/bus/pci/XXX for that device. - * - * Returns negative error code on failure, zero on success. - */ -static int __pci_mmap_make_offset(struct pci_dev *pdev, - struct vm_area_struct *vma, - enum pci_mmap_state mmap_state) -{ - unsigned long user_paddr, user_size; - int i, err; - - /* First compute the physical address in vma->vm_pgoff, - * making sure the user offset is within range in the - * appropriate PCI space. - */ - err = __pci_mmap_make_offset_bus(pdev, vma, mmap_state); - if (err) - return err; - - /* If this is a mapping on a host bridge, any address - * is OK. - */ - if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST) - return err; - - /* Otherwise make sure it's in the range for one of the - * device's resources. - */ - user_paddr = vma->vm_pgoff << PAGE_SHIFT; - user_size = vma->vm_end - vma->vm_start; - - for (i = 0; i <= PCI_ROM_RESOURCE; i++) { - struct resource *rp = &pdev->resource[i]; - resource_size_t aligned_end; - - /* Active? */ - if (!rp->flags) - continue; - - /* Same type? */ - if (i == PCI_ROM_RESOURCE) { - if (mmap_state != pci_mmap_mem) - continue; - } else { - if ((mmap_state == pci_mmap_io && - (rp->flags & IORESOURCE_IO) == 0) || - (mmap_state == pci_mmap_mem && - (rp->flags & IORESOURCE_MEM) == 0)) - continue; - } - - /* Align the resource end to the next page address. - * PAGE_SIZE intentionally added instead of (PAGE_SIZE - 1), - * because actually we need the address of the next byte - * after rp->end. - */ - aligned_end = (rp->end + PAGE_SIZE) & PAGE_MASK; - - if ((rp->start <= user_paddr) && - (user_paddr + user_size) <= aligned_end) - break; - } - - if (i > PCI_ROM_RESOURCE) - return -EINVAL; - - return 0; -} - /* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ @@ -869,10 +756,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct resource *res, { 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 89c8687..a0e5d8d 100644 --- a/arch/xtensa/kernel/pci.c +++ b/arch/xtensa/kernel/pci.c @@ -272,68 +272,6 @@ pci_controller_num(struct pci_dev *dev) */ /* - * Adjust vm_pgoff of VMA such that it is the physical page offset - * corresponding to the 32-bit pci bus offset for DEV requested by the user. - * - * Basically, the user finds the base address for his device which he wishes - * to mmap. They read the 32-bit value from the config space base register, - * add whatever PAGE_SIZE multiple offset they wish, and feed this into the - * offset parameter of mmap on /proc/bus/pci/XXX for that device. - * - * Returns negative error code on failure, zero on success. - */ -static __inline__ int -__pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma, - enum pci_mmap_state mmap_state) -{ - struct pci_controller *pci_ctrl = (struct pci_controller*) dev->sysdata; - unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; - unsigned long io_offset = 0; - int i, res_bit; - - if (pci_ctrl == 0) - return -EINVAL; /* should never happen */ - - /* If memory, add on the PCI bridge address offset */ - if (mmap_state == pci_mmap_mem) { - res_bit = IORESOURCE_MEM; - } else { - io_offset = (unsigned long)pci_ctrl->io_space.base; - offset += io_offset; - res_bit = IORESOURCE_IO; - } - - /* - * Check that the offset requested corresponds to one of the - * resources of the device. - */ - for (i = 0; i <= PCI_ROM_RESOURCE; i++) { - struct resource *rp = &dev->resource[i]; - int flags = rp->flags; - - /* treat ROM as memory (should be already) */ - if (i == PCI_ROM_RESOURCE) - flags |= IORESOURCE_MEM; - - /* Active and same type? */ - if ((flags & res_bit) == 0) - continue; - - /* In the range of this resource? */ - if (offset < (rp->start & PAGE_MASK) || offset > rp->end) - continue; - - /* found it! construct the final physical address */ - if (mmap_state == pci_mmap_io) - offset += pci_ctrl->io_space.start - io_offset; - vma->vm_pgoff = offset >> PAGE_SHIFT; - return 0; - } - - return -EINVAL; -} - -/* * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci * device mapping. */ @@ -367,11 +305,18 @@ int pci_mmap_page_range(struct pci_dev *dev, struct resource *res, 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 5bbe20c..307b3c0 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++) @@ -1008,10 +1018,21 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, if (i >= PCI_ROM_RESOURCE) return -ENODEV; + /* + * resource start have to be PAGE_SIZE aligned, as we pass + * back virt address include round down of resource_start, + * that caller can not figure out directly. + * when it is not aligned, that mean it is io port, should go + * pci_read_resource_io()/pci_write_resource_io() path. + */ + if (res->start & ~PAGE_MASK) + return -EINVAL; + 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 +1041,7 @@ 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, res, vma, mmap_type, write_combine); } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index a814bbb..10bd163 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 f19ee2a..7291635 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -227,26 +227,71 @@ 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; + enum pci_mmap_state mmap_type = fpriv->mmap_state; + resource_size_t offset; + int i, ret, flags; 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 (mmap_type == 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, mmap_type, 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; + } + ret = pci_mmap_page_range(dev, &dev->resource[i], vma, - fpriv->mmap_state, + mmap_type, fpriv->write_combine); if (ret < 0) return ret;