Message ID | 20201127164131.2244124-13-daniel.vetter@ffwll.ch (mailing list archive) |
---|---|
State | Not Applicable, archived |
Headers | show |
Series | None | expand |
On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > the region") /dev/kmem zaps ptes when the kernel requests exclusive > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > the default for all driver uses. > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > support. Let's plug that hole. > > For revoke_devmem() to work we need to link our vma into the same > address_space, with consistent vma->vm_pgoff. ->pgoff is already > adjusted, because that's how (io_)remap_pfn_range works, but for the > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > to adjust this at at ->open time: > > - for sysfs this is easy, now that binary attributes support this. We > just set bin_attr->mapping when mmap is supported > - for procfs it's a bit more tricky, since procfs pci access has only > one file per device, and access to a specific resources first needs > to be set up with some ioctl calls. But mmap is only supported for > the same resources as sysfs exposes with mmap support, and otherwise > rejected, so we can set the mapping unconditionally at open time > without harm. > > A special consideration is for arch_can_pci_mmap_io() - we need to > make sure that the ->f_mapping doesn't alias between ioport and iomem > space. There's only 2 ways in-tree to support mmap of ioports: generic > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > architecture hand-rolling. Both approach support ioport mmap through a > special pfn range and not through magic pte attributes. Aliasing is > therefore not a problem. > > The only difference in access checks left is that sysfs PCI mmap does > not check for CAP_RAWIO. I'm not really sure whether that should be > added or not. > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > Cc: Jason Gunthorpe <jgg@ziepe.ca> > Cc: Kees Cook <keescook@chromium.org> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: John Hubbard <jhubbard@nvidia.com> > Cc: Jérôme Glisse <jglisse@redhat.com> > Cc: Jan Kara <jack@suse.cz> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: linux-mm@kvack.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-samsung-soc@vger.kernel.org > Cc: linux-media@vger.kernel.org > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > -- > v2: > - Totally new approach: Adjust filp->f_mapping at open time. Note that > this now works on all architectures, not just those support > ARCH_GENERIC_PCI_MMAP_RESOURCE > --- > drivers/pci/pci-sysfs.c | 4 ++++ > drivers/pci/proc.c | 1 + > 2 files changed, 5 insertions(+) > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > index d15c881e2e7e..3f1c31bc0b7c 100644 > --- a/drivers/pci/pci-sysfs.c > +++ b/drivers/pci/pci-sysfs.c > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > b->legacy_io->read = pci_read_legacy_io; > b->legacy_io->write = pci_write_legacy_io; > b->legacy_io->mmap = pci_mmap_legacy_io; > + b->legacy_io->mapping = iomem_get_mapping(); > pci_adjust_legacy_attr(b, pci_mmap_io); > error = device_create_bin_file(&b->dev, b->legacy_io); > if (error) > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > b->legacy_mem->size = 1024*1024; > b->legacy_mem->attr.mode = 0600; > b->legacy_mem->mmap = pci_mmap_legacy_mem; > + b->legacy_io->mapping = iomem_get_mapping(); Unlike the normal pci stuff below, the legacy files here go boom because they're set up much earlier in the boot sequence. This only affects HAVE_PCI_LEGACY architectures, which aren't that many. So what should we do here now: - drop the devmem revoke for these - rework the init sequence somehow to set up these files a lot later - redo the sysfs patch so that it doesn't take an address_space pointer, but instead a callback to get at that (since at open time everything is set up). Imo rather ugly - ditch this part of the series (since there's not really any takers for the latter parts it might just not make sense to push for this) - something else? Bjorn, Greg, thoughts? Issuge got reported by Stephen on a powerpc when trying to build linux-next with this patch included. Thanks, Daniel > pci_adjust_legacy_attr(b, pci_mmap_mem); > error = device_create_bin_file(&b->dev, b->legacy_mem); > if (error) > @@ -1156,6 +1158,8 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) > res_attr->mmap = pci_mmap_resource_uc; > } > } > + if (res_attr->mmap) > + res_attr->mapping = iomem_get_mapping(); > res_attr->attr.name = res_attr_name; > res_attr->attr.mode = 0600; > res_attr->size = pci_resource_len(pdev, num); > diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c > index 3a2f90beb4cb..9bab07302bbf 100644 > --- a/drivers/pci/proc.c > +++ b/drivers/pci/proc.c > @@ -298,6 +298,7 @@ static int proc_bus_pci_open(struct inode *inode, struct file *file) > fpriv->write_combine = 0; > > file->private_data = fpriv; > + file->f_mapping = iomem_get_mapping(); > > return 0; > } > -- > 2.29.2 >
On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > the default for all driver uses. > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > support. Let's plug that hole. > > > > For revoke_devmem() to work we need to link our vma into the same > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > to adjust this at at ->open time: > > > > - for sysfs this is easy, now that binary attributes support this. We > > just set bin_attr->mapping when mmap is supported > > - for procfs it's a bit more tricky, since procfs pci access has only > > one file per device, and access to a specific resources first needs > > to be set up with some ioctl calls. But mmap is only supported for > > the same resources as sysfs exposes with mmap support, and otherwise > > rejected, so we can set the mapping unconditionally at open time > > without harm. > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > architecture hand-rolling. Both approach support ioport mmap through a > > special pfn range and not through magic pte attributes. Aliasing is > > therefore not a problem. > > > > The only difference in access checks left is that sysfs PCI mmap does > > not check for CAP_RAWIO. I'm not really sure whether that should be > > added or not. > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > Cc: Kees Cook <keescook@chromium.org> > > Cc: Dan Williams <dan.j.williams@intel.com> > > Cc: Andrew Morton <akpm@linux-foundation.org> > > Cc: John Hubbard <jhubbard@nvidia.com> > > Cc: Jérôme Glisse <jglisse@redhat.com> > > Cc: Jan Kara <jack@suse.cz> > > Cc: Dan Williams <dan.j.williams@intel.com> > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > Cc: linux-mm@kvack.org > > Cc: linux-arm-kernel@lists.infradead.org > > Cc: linux-samsung-soc@vger.kernel.org > > Cc: linux-media@vger.kernel.org > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: linux-pci@vger.kernel.org > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > -- > > v2: > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > this now works on all architectures, not just those support > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > --- > > drivers/pci/pci-sysfs.c | 4 ++++ > > drivers/pci/proc.c | 1 + > > 2 files changed, 5 insertions(+) > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > --- a/drivers/pci/pci-sysfs.c > > +++ b/drivers/pci/pci-sysfs.c > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > b->legacy_io->read = pci_read_legacy_io; > > b->legacy_io->write = pci_write_legacy_io; > > b->legacy_io->mmap = pci_mmap_legacy_io; > > + b->legacy_io->mapping = iomem_get_mapping(); > > pci_adjust_legacy_attr(b, pci_mmap_io); > > error = device_create_bin_file(&b->dev, b->legacy_io); > > if (error) > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > b->legacy_mem->size = 1024*1024; > > b->legacy_mem->attr.mode = 0600; > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > + b->legacy_io->mapping = iomem_get_mapping(); > > Unlike the normal pci stuff below, the legacy files here go boom > because they're set up much earlier in the boot sequence. This only > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > should we do here now: > - drop the devmem revoke for these > - rework the init sequence somehow to set up these files a lot later > - redo the sysfs patch so that it doesn't take an address_space > pointer, but instead a callback to get at that (since at open time > everything is set up). Imo rather ugly > - ditch this part of the series (since there's not really any takers > for the latter parts it might just not make sense to push for this) > - something else? > > Bjorn, Greg, thoughts? What sysfs patch are you referring to here? thanks, greg k-h
On Tue, Jan 19, 2021 at 3:32 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > > On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > > the default for all driver uses. > > > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > > support. Let's plug that hole. > > > > > > For revoke_devmem() to work we need to link our vma into the same > > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > > to adjust this at at ->open time: > > > > > > - for sysfs this is easy, now that binary attributes support this. We > > > just set bin_attr->mapping when mmap is supported > > > - for procfs it's a bit more tricky, since procfs pci access has only > > > one file per device, and access to a specific resources first needs > > > to be set up with some ioctl calls. But mmap is only supported for > > > the same resources as sysfs exposes with mmap support, and otherwise > > > rejected, so we can set the mapping unconditionally at open time > > > without harm. > > > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > > architecture hand-rolling. Both approach support ioport mmap through a > > > special pfn range and not through magic pte attributes. Aliasing is > > > therefore not a problem. > > > > > > The only difference in access checks left is that sysfs PCI mmap does > > > not check for CAP_RAWIO. I'm not really sure whether that should be > > > added or not. > > > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > > Cc: Kees Cook <keescook@chromium.org> > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > Cc: John Hubbard <jhubbard@nvidia.com> > > > Cc: Jérôme Glisse <jglisse@redhat.com> > > > Cc: Jan Kara <jack@suse.cz> > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > Cc: linux-mm@kvack.org > > > Cc: linux-arm-kernel@lists.infradead.org > > > Cc: linux-samsung-soc@vger.kernel.org > > > Cc: linux-media@vger.kernel.org > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > > Cc: linux-pci@vger.kernel.org > > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > -- > > > v2: > > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > > this now works on all architectures, not just those support > > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > > --- > > > drivers/pci/pci-sysfs.c | 4 ++++ > > > drivers/pci/proc.c | 1 + > > > 2 files changed, 5 insertions(+) > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > > --- a/drivers/pci/pci-sysfs.c > > > +++ b/drivers/pci/pci-sysfs.c > > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > b->legacy_io->read = pci_read_legacy_io; > > > b->legacy_io->write = pci_write_legacy_io; > > > b->legacy_io->mmap = pci_mmap_legacy_io; > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > pci_adjust_legacy_attr(b, pci_mmap_io); > > > error = device_create_bin_file(&b->dev, b->legacy_io); > > > if (error) > > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > b->legacy_mem->size = 1024*1024; > > > b->legacy_mem->attr.mode = 0600; > > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > Unlike the normal pci stuff below, the legacy files here go boom > > because they're set up much earlier in the boot sequence. This only > > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > > should we do here now: > > - drop the devmem revoke for these > > - rework the init sequence somehow to set up these files a lot later > > - redo the sysfs patch so that it doesn't take an address_space > > pointer, but instead a callback to get at that (since at open time > > everything is set up). Imo rather ugly > > - ditch this part of the series (since there's not really any takers > > for the latter parts it might just not make sense to push for this) > > - something else? > > > > Bjorn, Greg, thoughts? > > What sysfs patch are you referring to here? Currently in linux-next: commit 74b30195395c406c787280a77ae55aed82dbbfc7 (HEAD -> topic/iomem-mmap-vs-gup, drm/topic/iomem-mmap-vs-gup) Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Fri Nov 27 17:41:25 2020 +0100 sysfs: Support zapping of binary attr mmaps Or the patch right before this one in this submission here: https://lore.kernel.org/dri-devel/20201127164131.2244124-12-daniel.vetter@ffwll.ch/ Cheers, Daniel
On Tue, Jan 19, 2021 at 03:34:47PM +0100, Daniel Vetter wrote: > On Tue, Jan 19, 2021 at 3:32 PM Greg Kroah-Hartman > <gregkh@linuxfoundation.org> wrote: > > > > On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > > > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > > > the default for all driver uses. > > > > > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > > > support. Let's plug that hole. > > > > > > > > For revoke_devmem() to work we need to link our vma into the same > > > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > > > to adjust this at at ->open time: > > > > > > > > - for sysfs this is easy, now that binary attributes support this. We > > > > just set bin_attr->mapping when mmap is supported > > > > - for procfs it's a bit more tricky, since procfs pci access has only > > > > one file per device, and access to a specific resources first needs > > > > to be set up with some ioctl calls. But mmap is only supported for > > > > the same resources as sysfs exposes with mmap support, and otherwise > > > > rejected, so we can set the mapping unconditionally at open time > > > > without harm. > > > > > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > > > architecture hand-rolling. Both approach support ioport mmap through a > > > > special pfn range and not through magic pte attributes. Aliasing is > > > > therefore not a problem. > > > > > > > > The only difference in access checks left is that sysfs PCI mmap does > > > > not check for CAP_RAWIO. I'm not really sure whether that should be > > > > added or not. > > > > > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > > > Cc: Kees Cook <keescook@chromium.org> > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > > Cc: John Hubbard <jhubbard@nvidia.com> > > > > Cc: Jérôme Glisse <jglisse@redhat.com> > > > > Cc: Jan Kara <jack@suse.cz> > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > > Cc: linux-mm@kvack.org > > > > Cc: linux-arm-kernel@lists.infradead.org > > > > Cc: linux-samsung-soc@vger.kernel.org > > > > Cc: linux-media@vger.kernel.org > > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > > > Cc: linux-pci@vger.kernel.org > > > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > -- > > > > v2: > > > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > > > this now works on all architectures, not just those support > > > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > > > --- > > > > drivers/pci/pci-sysfs.c | 4 ++++ > > > > drivers/pci/proc.c | 1 + > > > > 2 files changed, 5 insertions(+) > > > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > > > --- a/drivers/pci/pci-sysfs.c > > > > +++ b/drivers/pci/pci-sysfs.c > > > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > b->legacy_io->read = pci_read_legacy_io; > > > > b->legacy_io->write = pci_write_legacy_io; > > > > b->legacy_io->mmap = pci_mmap_legacy_io; > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > pci_adjust_legacy_attr(b, pci_mmap_io); > > > > error = device_create_bin_file(&b->dev, b->legacy_io); > > > > if (error) > > > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > b->legacy_mem->size = 1024*1024; > > > > b->legacy_mem->attr.mode = 0600; > > > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > Unlike the normal pci stuff below, the legacy files here go boom > > > because they're set up much earlier in the boot sequence. This only > > > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > > > should we do here now: > > > - drop the devmem revoke for these > > > - rework the init sequence somehow to set up these files a lot later > > > - redo the sysfs patch so that it doesn't take an address_space > > > pointer, but instead a callback to get at that (since at open time > > > everything is set up). Imo rather ugly > > > - ditch this part of the series (since there's not really any takers > > > for the latter parts it might just not make sense to push for this) > > > - something else? > > > > > > Bjorn, Greg, thoughts? > > > > What sysfs patch are you referring to here? > > Currently in linux-next: > > commit 74b30195395c406c787280a77ae55aed82dbbfc7 (HEAD -> > topic/iomem-mmap-vs-gup, drm/topic/iomem-mmap-vs-gup) > Author: Daniel Vetter <daniel.vetter@ffwll.ch> > Date: Fri Nov 27 17:41:25 2020 +0100 > > sysfs: Support zapping of binary attr mmaps > > Or the patch right before this one in this submission here: > > https://lore.kernel.org/dri-devel/20201127164131.2244124-12-daniel.vetter@ffwll.ch/ Ah. Hm, a callback in the sysfs file logic seems really hairy, so I would prefer that not happen. If no one really needs this stuff, why not just drop it like you mention? thanks, greg k-h
On Tue, Jan 19, 2021 at 4:20 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > > On Tue, Jan 19, 2021 at 03:34:47PM +0100, Daniel Vetter wrote: > > On Tue, Jan 19, 2021 at 3:32 PM Greg Kroah-Hartman > > <gregkh@linuxfoundation.org> wrote: > > > > > > On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > > > > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > > > > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > > > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > > > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > > > > the default for all driver uses. > > > > > > > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > > > > support. Let's plug that hole. > > > > > > > > > > For revoke_devmem() to work we need to link our vma into the same > > > > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > > > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > > > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > > > > to adjust this at at ->open time: > > > > > > > > > > - for sysfs this is easy, now that binary attributes support this. We > > > > > just set bin_attr->mapping when mmap is supported > > > > > - for procfs it's a bit more tricky, since procfs pci access has only > > > > > one file per device, and access to a specific resources first needs > > > > > to be set up with some ioctl calls. But mmap is only supported for > > > > > the same resources as sysfs exposes with mmap support, and otherwise > > > > > rejected, so we can set the mapping unconditionally at open time > > > > > without harm. > > > > > > > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > > > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > > > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > > > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > > > > architecture hand-rolling. Both approach support ioport mmap through a > > > > > special pfn range and not through magic pte attributes. Aliasing is > > > > > therefore not a problem. > > > > > > > > > > The only difference in access checks left is that sysfs PCI mmap does > > > > > not check for CAP_RAWIO. I'm not really sure whether that should be > > > > > added or not. > > > > > > > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > > > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > > > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > > > > Cc: Kees Cook <keescook@chromium.org> > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > > > Cc: John Hubbard <jhubbard@nvidia.com> > > > > > Cc: Jérôme Glisse <jglisse@redhat.com> > > > > > Cc: Jan Kara <jack@suse.cz> > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > > > Cc: linux-mm@kvack.org > > > > > Cc: linux-arm-kernel@lists.infradead.org > > > > > Cc: linux-samsung-soc@vger.kernel.org > > > > > Cc: linux-media@vger.kernel.org > > > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > > > > Cc: linux-pci@vger.kernel.org > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > > -- > > > > > v2: > > > > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > > > > this now works on all architectures, not just those support > > > > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > > > > --- > > > > > drivers/pci/pci-sysfs.c | 4 ++++ > > > > > drivers/pci/proc.c | 1 + > > > > > 2 files changed, 5 insertions(+) > > > > > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > > > > --- a/drivers/pci/pci-sysfs.c > > > > > +++ b/drivers/pci/pci-sysfs.c > > > > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > b->legacy_io->read = pci_read_legacy_io; > > > > > b->legacy_io->write = pci_write_legacy_io; > > > > > b->legacy_io->mmap = pci_mmap_legacy_io; > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > pci_adjust_legacy_attr(b, pci_mmap_io); > > > > > error = device_create_bin_file(&b->dev, b->legacy_io); > > > > > if (error) > > > > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > b->legacy_mem->size = 1024*1024; > > > > > b->legacy_mem->attr.mode = 0600; > > > > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > > > Unlike the normal pci stuff below, the legacy files here go boom > > > > because they're set up much earlier in the boot sequence. This only > > > > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > > > > should we do here now: > > > > - drop the devmem revoke for these > > > > - rework the init sequence somehow to set up these files a lot later > > > > - redo the sysfs patch so that it doesn't take an address_space > > > > pointer, but instead a callback to get at that (since at open time > > > > everything is set up). Imo rather ugly > > > > - ditch this part of the series (since there's not really any takers > > > > for the latter parts it might just not make sense to push for this) > > > > - something else? > > > > > > > > Bjorn, Greg, thoughts? > > > > > > What sysfs patch are you referring to here? > > > > Currently in linux-next: > > > > commit 74b30195395c406c787280a77ae55aed82dbbfc7 (HEAD -> > > topic/iomem-mmap-vs-gup, drm/topic/iomem-mmap-vs-gup) > > Author: Daniel Vetter <daniel.vetter@ffwll.ch> > > Date: Fri Nov 27 17:41:25 2020 +0100 > > > > sysfs: Support zapping of binary attr mmaps > > > > Or the patch right before this one in this submission here: > > > > https://lore.kernel.org/dri-devel/20201127164131.2244124-12-daniel.vetter@ffwll.ch/ > > Ah. Hm, a callback in the sysfs file logic seems really hairy, so I > would prefer that not happen. If no one really needs this stuff, why > not just drop it like you mention? Well it is needed, but just on architectures I don't care about much. Most relevant is perhaps powerpc (that's where Stephen hit the issue). I do wonder whether we could move the legacy pci files setup to where the modern stuff is set up from pci_create_resource_files() or maybe pci_create_sysfs_dev_files() even for HAVE_PCI_LEGACY. I think that might work, but since it's legacy flow on some funny architectures (alpha, itanium, that kind of stuff) I have no idea what kind of monsters I'm going to anger :-) -Daniel
On Tue, Jan 19, 2021 at 5:03 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > On Tue, Jan 19, 2021 at 4:20 PM Greg Kroah-Hartman > <gregkh@linuxfoundation.org> wrote: > > > > On Tue, Jan 19, 2021 at 03:34:47PM +0100, Daniel Vetter wrote: > > > On Tue, Jan 19, 2021 at 3:32 PM Greg Kroah-Hartman > > > <gregkh@linuxfoundation.org> wrote: > > > > > > > > On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > > > > > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > > > > > > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > > > > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > > > > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > > > > > the default for all driver uses. > > > > > > > > > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > > > > > support. Let's plug that hole. > > > > > > > > > > > > For revoke_devmem() to work we need to link our vma into the same > > > > > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > > > > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > > > > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > > > > > to adjust this at at ->open time: > > > > > > > > > > > > - for sysfs this is easy, now that binary attributes support this. We > > > > > > just set bin_attr->mapping when mmap is supported > > > > > > - for procfs it's a bit more tricky, since procfs pci access has only > > > > > > one file per device, and access to a specific resources first needs > > > > > > to be set up with some ioctl calls. But mmap is only supported for > > > > > > the same resources as sysfs exposes with mmap support, and otherwise > > > > > > rejected, so we can set the mapping unconditionally at open time > > > > > > without harm. > > > > > > > > > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > > > > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > > > > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > > > > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > > > > > architecture hand-rolling. Both approach support ioport mmap through a > > > > > > special pfn range and not through magic pte attributes. Aliasing is > > > > > > therefore not a problem. > > > > > > > > > > > > The only difference in access checks left is that sysfs PCI mmap does > > > > > > not check for CAP_RAWIO. I'm not really sure whether that should be > > > > > > added or not. > > > > > > > > > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > > > > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > > > > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > > > > > Cc: Kees Cook <keescook@chromium.org> > > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > > > > Cc: John Hubbard <jhubbard@nvidia.com> > > > > > > Cc: Jérôme Glisse <jglisse@redhat.com> > > > > > > Cc: Jan Kara <jack@suse.cz> > > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > > > > Cc: linux-mm@kvack.org > > > > > > Cc: linux-arm-kernel@lists.infradead.org > > > > > > Cc: linux-samsung-soc@vger.kernel.org > > > > > > Cc: linux-media@vger.kernel.org > > > > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > > > > > Cc: linux-pci@vger.kernel.org > > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > > > -- > > > > > > v2: > > > > > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > > > > > this now works on all architectures, not just those support > > > > > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > > > > > --- > > > > > > drivers/pci/pci-sysfs.c | 4 ++++ > > > > > > drivers/pci/proc.c | 1 + > > > > > > 2 files changed, 5 insertions(+) > > > > > > > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > > > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > > > > > --- a/drivers/pci/pci-sysfs.c > > > > > > +++ b/drivers/pci/pci-sysfs.c > > > > > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > > b->legacy_io->read = pci_read_legacy_io; > > > > > > b->legacy_io->write = pci_write_legacy_io; > > > > > > b->legacy_io->mmap = pci_mmap_legacy_io; > > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > pci_adjust_legacy_attr(b, pci_mmap_io); > > > > > > error = device_create_bin_file(&b->dev, b->legacy_io); > > > > > > if (error) > > > > > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > > b->legacy_mem->size = 1024*1024; > > > > > > b->legacy_mem->attr.mode = 0600; > > > > > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > > > > > Unlike the normal pci stuff below, the legacy files here go boom > > > > > because they're set up much earlier in the boot sequence. This only > > > > > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > > > > > should we do here now: > > > > > - drop the devmem revoke for these > > > > > - rework the init sequence somehow to set up these files a lot later > > > > > - redo the sysfs patch so that it doesn't take an address_space > > > > > pointer, but instead a callback to get at that (since at open time > > > > > everything is set up). Imo rather ugly > > > > > - ditch this part of the series (since there's not really any takers > > > > > for the latter parts it might just not make sense to push for this) > > > > > - something else? > > > > > > > > > > Bjorn, Greg, thoughts? > > > > > > > > What sysfs patch are you referring to here? > > > > > > Currently in linux-next: > > > > > > commit 74b30195395c406c787280a77ae55aed82dbbfc7 (HEAD -> > > > topic/iomem-mmap-vs-gup, drm/topic/iomem-mmap-vs-gup) > > > Author: Daniel Vetter <daniel.vetter@ffwll.ch> > > > Date: Fri Nov 27 17:41:25 2020 +0100 > > > > > > sysfs: Support zapping of binary attr mmaps > > > > > > Or the patch right before this one in this submission here: > > > > > > https://lore.kernel.org/dri-devel/20201127164131.2244124-12-daniel.vetter@ffwll.ch/ > > > > Ah. Hm, a callback in the sysfs file logic seems really hairy, so I > > would prefer that not happen. If no one really needs this stuff, why > > not just drop it like you mention? > > Well it is needed, but just on architectures I don't care about much. > Most relevant is perhaps powerpc (that's where Stephen hit the issue). > I do wonder whether we could move the legacy pci files setup to where > the modern stuff is set up from pci_create_resource_files() or maybe > pci_create_sysfs_dev_files() even for HAVE_PCI_LEGACY. I think that > might work, but since it's legacy flow on some funny architectures > (alpha, itanium, that kind of stuff) I have no idea what kind of > monsters I'm going to anger :-) Back from a week of vacation, I looked at this again and I think shouldn't be hard to fix this with the sam trick pci_create_sysfs_dev_files() uses: As long as sysfs_initialized isn't set we skip, and then later on when the vfs is up&running we can initialize everything. To be able to apply the same thing to pci_create_legacy_files() I think all I need is to iterate overa all struct pci_bus in pci_sysfs_init() and we're good. Unfortunately I didn't find any for_each_pci_bus(), so how do I do that? Thanks, Daniel
On Wed, Feb 3, 2021 at 5:14 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > On Tue, Jan 19, 2021 at 5:03 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > On Tue, Jan 19, 2021 at 4:20 PM Greg Kroah-Hartman > > <gregkh@linuxfoundation.org> wrote: > > > > > > On Tue, Jan 19, 2021 at 03:34:47PM +0100, Daniel Vetter wrote: > > > > On Tue, Jan 19, 2021 at 3:32 PM Greg Kroah-Hartman > > > > <gregkh@linuxfoundation.org> wrote: > > > > > > > > > > On Tue, Jan 19, 2021 at 09:17:55AM +0100, Daniel Vetter wrote: > > > > > > On Fri, Nov 27, 2020 at 5:42 PM Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > > > > > > > > > > > > > > Since 3234ac664a87 ("/dev/mem: Revoke mappings when a driver claims > > > > > > > the region") /dev/kmem zaps ptes when the kernel requests exclusive > > > > > > > acccess to an iomem region. And with CONFIG_IO_STRICT_DEVMEM, this is > > > > > > > the default for all driver uses. > > > > > > > > > > > > > > Except there's two more ways to access PCI BARs: sysfs and proc mmap > > > > > > > support. Let's plug that hole. > > > > > > > > > > > > > > For revoke_devmem() to work we need to link our vma into the same > > > > > > > address_space, with consistent vma->vm_pgoff. ->pgoff is already > > > > > > > adjusted, because that's how (io_)remap_pfn_range works, but for the > > > > > > > mapping we need to adjust vma->vm_file->f_mapping. The cleanest way is > > > > > > > to adjust this at at ->open time: > > > > > > > > > > > > > > - for sysfs this is easy, now that binary attributes support this. We > > > > > > > just set bin_attr->mapping when mmap is supported > > > > > > > - for procfs it's a bit more tricky, since procfs pci access has only > > > > > > > one file per device, and access to a specific resources first needs > > > > > > > to be set up with some ioctl calls. But mmap is only supported for > > > > > > > the same resources as sysfs exposes with mmap support, and otherwise > > > > > > > rejected, so we can set the mapping unconditionally at open time > > > > > > > without harm. > > > > > > > > > > > > > > A special consideration is for arch_can_pci_mmap_io() - we need to > > > > > > > make sure that the ->f_mapping doesn't alias between ioport and iomem > > > > > > > space. There's only 2 ways in-tree to support mmap of ioports: generic > > > > > > > pci mmap (ARCH_GENERIC_PCI_MMAP_RESOURCE), and sparc as the single > > > > > > > architecture hand-rolling. Both approach support ioport mmap through a > > > > > > > special pfn range and not through magic pte attributes. Aliasing is > > > > > > > therefore not a problem. > > > > > > > > > > > > > > The only difference in access checks left is that sysfs PCI mmap does > > > > > > > not check for CAP_RAWIO. I'm not really sure whether that should be > > > > > > > added or not. > > > > > > > > > > > > > > Acked-by: Bjorn Helgaas <bhelgaas@google.com> > > > > > > > Reviewed-by: Dan Williams <dan.j.williams@intel.com> > > > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> > > > > > > > Cc: Jason Gunthorpe <jgg@ziepe.ca> > > > > > > > Cc: Kees Cook <keescook@chromium.org> > > > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > > > Cc: Andrew Morton <akpm@linux-foundation.org> > > > > > > > Cc: John Hubbard <jhubbard@nvidia.com> > > > > > > > Cc: Jérôme Glisse <jglisse@redhat.com> > > > > > > > Cc: Jan Kara <jack@suse.cz> > > > > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > > > > > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > > > > > > Cc: linux-mm@kvack.org > > > > > > > Cc: linux-arm-kernel@lists.infradead.org > > > > > > > Cc: linux-samsung-soc@vger.kernel.org > > > > > > > Cc: linux-media@vger.kernel.org > > > > > > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > > > > > > Cc: linux-pci@vger.kernel.org > > > > > > > Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > > > > -- > > > > > > > v2: > > > > > > > - Totally new approach: Adjust filp->f_mapping at open time. Note that > > > > > > > this now works on all architectures, not just those support > > > > > > > ARCH_GENERIC_PCI_MMAP_RESOURCE > > > > > > > --- > > > > > > > drivers/pci/pci-sysfs.c | 4 ++++ > > > > > > > drivers/pci/proc.c | 1 + > > > > > > > 2 files changed, 5 insertions(+) > > > > > > > > > > > > > > diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c > > > > > > > index d15c881e2e7e..3f1c31bc0b7c 100644 > > > > > > > --- a/drivers/pci/pci-sysfs.c > > > > > > > +++ b/drivers/pci/pci-sysfs.c > > > > > > > @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > > > b->legacy_io->read = pci_read_legacy_io; > > > > > > > b->legacy_io->write = pci_write_legacy_io; > > > > > > > b->legacy_io->mmap = pci_mmap_legacy_io; > > > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > > pci_adjust_legacy_attr(b, pci_mmap_io); > > > > > > > error = device_create_bin_file(&b->dev, b->legacy_io); > > > > > > > if (error) > > > > > > > @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) > > > > > > > b->legacy_mem->size = 1024*1024; > > > > > > > b->legacy_mem->attr.mode = 0600; > > > > > > > b->legacy_mem->mmap = pci_mmap_legacy_mem; > > > > > > > + b->legacy_io->mapping = iomem_get_mapping(); > > > > > > > > > > > > Unlike the normal pci stuff below, the legacy files here go boom > > > > > > because they're set up much earlier in the boot sequence. This only > > > > > > affects HAVE_PCI_LEGACY architectures, which aren't that many. So what > > > > > > should we do here now: > > > > > > - drop the devmem revoke for these > > > > > > - rework the init sequence somehow to set up these files a lot later > > > > > > - redo the sysfs patch so that it doesn't take an address_space > > > > > > pointer, but instead a callback to get at that (since at open time > > > > > > everything is set up). Imo rather ugly > > > > > > - ditch this part of the series (since there's not really any takers > > > > > > for the latter parts it might just not make sense to push for this) > > > > > > - something else? > > > > > > > > > > > > Bjorn, Greg, thoughts? > > > > > > > > > > What sysfs patch are you referring to here? > > > > > > > > Currently in linux-next: > > > > > > > > commit 74b30195395c406c787280a77ae55aed82dbbfc7 (HEAD -> > > > > topic/iomem-mmap-vs-gup, drm/topic/iomem-mmap-vs-gup) > > > > Author: Daniel Vetter <daniel.vetter@ffwll.ch> > > > > Date: Fri Nov 27 17:41:25 2020 +0100 > > > > > > > > sysfs: Support zapping of binary attr mmaps > > > > > > > > Or the patch right before this one in this submission here: > > > > > > > > https://lore.kernel.org/dri-devel/20201127164131.2244124-12-daniel.vetter@ffwll.ch/ > > > > > > Ah. Hm, a callback in the sysfs file logic seems really hairy, so I > > > would prefer that not happen. If no one really needs this stuff, why > > > not just drop it like you mention? > > > > Well it is needed, but just on architectures I don't care about much. > > Most relevant is perhaps powerpc (that's where Stephen hit the issue). > > I do wonder whether we could move the legacy pci files setup to where > > the modern stuff is set up from pci_create_resource_files() or maybe > > pci_create_sysfs_dev_files() even for HAVE_PCI_LEGACY. I think that > > might work, but since it's legacy flow on some funny architectures > > (alpha, itanium, that kind of stuff) I have no idea what kind of > > monsters I'm going to anger :-) > > Back from a week of vacation, I looked at this again and I think > shouldn't be hard to fix this with the sam trick > pci_create_sysfs_dev_files() uses: As long as sysfs_initialized isn't > set we skip, and then later on when the vfs is up&running we can > initialize everything. > > To be able to apply the same thing to pci_create_legacy_files() I > think all I need is to iterate overa all struct pci_bus in > pci_sysfs_init() and we're good. Unfortunately I didn't find any > for_each_pci_bus(), so how do I do that? pci_find_next_bus() seems to be the answer I want. I'll see whether that works and then send out new patches. -Daniel
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index d15c881e2e7e..3f1c31bc0b7c 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -929,6 +929,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_io->read = pci_read_legacy_io; b->legacy_io->write = pci_write_legacy_io; b->legacy_io->mmap = pci_mmap_legacy_io; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_io); error = device_create_bin_file(&b->dev, b->legacy_io); if (error) @@ -941,6 +942,7 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_mem->size = 1024*1024; b->legacy_mem->attr.mode = 0600; b->legacy_mem->mmap = pci_mmap_legacy_mem; + b->legacy_io->mapping = iomem_get_mapping(); pci_adjust_legacy_attr(b, pci_mmap_mem); error = device_create_bin_file(&b->dev, b->legacy_mem); if (error) @@ -1156,6 +1158,8 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) res_attr->mmap = pci_mmap_resource_uc; } } + if (res_attr->mmap) + res_attr->mapping = iomem_get_mapping(); res_attr->attr.name = res_attr_name; res_attr->attr.mode = 0600; res_attr->size = pci_resource_len(pdev, num); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 3a2f90beb4cb..9bab07302bbf 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -298,6 +298,7 @@ static int proc_bus_pci_open(struct inode *inode, struct file *file) fpriv->write_combine = 0; file->private_data = fpriv; + file->f_mapping = iomem_get_mapping(); return 0; }