From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Subject: Re: [RFC PATCH v2 12/15] drivers: acpi: implement acpi_dma_configure Date: Fri, 10 Jun 2016 11:25:28 -0500 Message-ID: <20160610162528.GI19309@localhost> References: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> <1465306270-27076-13-git-send-email-lorenzo.pieralisi@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1465306270-27076-13-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Lorenzo Pieralisi Cc: Marc Zyngier , Tomasz Nowicki , "Rafael J. Wysocki" , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Will Deacon , linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sinan Kaya , linux-acpi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Hanjun Guo , Jon Masters , Bjorn Helgaas , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Tue, Jun 07, 2016 at 02:31:07PM +0100, Lorenzo Pieralisi wrote: > On DT based systems, the of_dma_configure() API implements DMA configuration > for a given device. On ACPI systems an API equivalent to of_dma_configure() > is missing which implies that it is currently not possible to set-up DMA > operations for devices through the ACPI generic kernel layer. > > This patch fills the gap by introducing acpi_dma_configure/deconfigure() > calls that for now are just wrappers around arch_setup_dma_ops() and > arch_teardown_dma_ops() and also updates ACPI and PCI core code to use > the newly introduced acpi_dma_configure/acpi_dma_deconfigure functions. > > The DMA range size passed to arch_setup_dma_ops() is sized according > to the device coherent_dma_mask (starting at address 0x0), mirroring the > DT probing path behaviour when a dma-ranges property is not provided > for the device being probed; this changes the current arch_setup_dma_ops() > call parameters in the ACPI probing case, but since arch_setup_dma_ops() > is a NOP on all architectures but ARM/ARM64 this patch does not change > the current kernel behaviour on them. > > Signed-off-by: Lorenzo Pieralisi > Cc: Bjorn Helgaas > Cc: Robin Murphy > Cc: Tomasz Nowicki > Cc: Joerg Roedel > Cc: "Rafael J. Wysocki" Acked-by: Bjorn Helgaas I assume this will be merged by somebody else along with the rest of the series. > --- > drivers/acpi/glue.c | 4 ++-- > drivers/acpi/scan.c | 24 ++++++++++++++++++++++++ > drivers/pci/probe.c | 3 +-- > include/acpi/acpi_bus.h | 2 ++ > include/linux/acpi.h | 5 +++++ > 5 files changed, 34 insertions(+), 4 deletions(-) > > diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c > index 5ea5dc2..f8d6564 100644 > --- a/drivers/acpi/glue.c > +++ b/drivers/acpi/glue.c > @@ -227,8 +227,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > > attr = acpi_get_dma_attr(acpi_dev); > if (attr != DEV_DMA_NOT_SUPPORTED) > - arch_setup_dma_ops(dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(dev, attr); > > acpi_physnode_link_name(physical_node_name, node_id); > retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, > @@ -251,6 +250,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > return 0; > > err: > + acpi_dma_deconfigure(dev); > ACPI_COMPANION_SET(dev, NULL); > put_device(dev); > put_device(&acpi_dev->dev); > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 5f28cf7..b4b9064 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1358,6 +1358,30 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NON_COHERENT; > } > > +/** > + * acpi_dma_configure - Set-up DMA configuration for the device. > + * @dev: The pointer to the device > + * @attr: device dma attributes > + */ > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) > +{ > + /* > + * Assume dma valid range starts at 0 and covers the whole > + * coherent_dma_mask. > + */ > + arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, NULL, > + attr == DEV_DMA_COHERENT); > +} > + > +/** > + * acpi_dma_deconfigure - Tear-down DMA configuration for the device. > + * @dev: The pointer to the device > + */ > +void acpi_dma_deconfigure(struct device *dev) > +{ > + arch_teardown_dma_ops(dev); > +} > + > static void acpi_init_coherency(struct acpi_device *adev) > { > unsigned long long cca = 0; > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 8e3ef72..01dd369 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -1725,8 +1725,7 @@ static void pci_dma_configure(struct pci_dev *dev) > if (attr == DEV_DMA_NOT_SUPPORTED) > dev_warn(&dev->dev, "DMA not supported.\n"); > else > - arch_setup_dma_ops(&dev->dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(&dev->dev, attr); > } > > pci_put_host_bridge_device(bridge); > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 788c6c35..8b5039a 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -566,6 +566,8 @@ struct acpi_pci_root { > > bool acpi_dma_supported(struct acpi_device *adev); > enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev); > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr); > +void acpi_dma_deconfigure(struct device *dev); > > struct acpi_device *acpi_find_child_device(struct acpi_device *parent, > u64 address, bool check_children); > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 288fac5..135a452 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -676,6 +676,11 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NOT_SUPPORTED; > } > > +static inline void acpi_dma_configure(struct device *dev, > + enum dev_dma_attr attr) { } > + > +static inline void acpi_dma_deconfigure(struct device *dev) { } > + > #define ACPI_PTR(_ptr) (NULL) > > #endif /* !CONFIG_ACPI */ > -- > 2.6.4 > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933281AbcFJQZg (ORCPT ); Fri, 10 Jun 2016 12:25:36 -0400 Received: from mail.kernel.org ([198.145.29.136]:37468 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753321AbcFJQZd (ORCPT ); Fri, 10 Jun 2016 12:25:33 -0400 Date: Fri, 10 Jun 2016 11:25:28 -0500 From: Bjorn Helgaas To: Lorenzo Pieralisi Cc: iommu@lists.linux-foundation.org, Bjorn Helgaas , Robin Murphy , Tomasz Nowicki , Joerg Roedel , "Rafael J. Wysocki" , Will Deacon , Marc Zyngier , Hanjun Guo , Jon Masters , Sinan Kaya , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [RFC PATCH v2 12/15] drivers: acpi: implement acpi_dma_configure Message-ID: <20160610162528.GI19309@localhost> References: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> <1465306270-27076-13-git-send-email-lorenzo.pieralisi@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1465306270-27076-13-git-send-email-lorenzo.pieralisi@arm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 07, 2016 at 02:31:07PM +0100, Lorenzo Pieralisi wrote: > On DT based systems, the of_dma_configure() API implements DMA configuration > for a given device. On ACPI systems an API equivalent to of_dma_configure() > is missing which implies that it is currently not possible to set-up DMA > operations for devices through the ACPI generic kernel layer. > > This patch fills the gap by introducing acpi_dma_configure/deconfigure() > calls that for now are just wrappers around arch_setup_dma_ops() and > arch_teardown_dma_ops() and also updates ACPI and PCI core code to use > the newly introduced acpi_dma_configure/acpi_dma_deconfigure functions. > > The DMA range size passed to arch_setup_dma_ops() is sized according > to the device coherent_dma_mask (starting at address 0x0), mirroring the > DT probing path behaviour when a dma-ranges property is not provided > for the device being probed; this changes the current arch_setup_dma_ops() > call parameters in the ACPI probing case, but since arch_setup_dma_ops() > is a NOP on all architectures but ARM/ARM64 this patch does not change > the current kernel behaviour on them. > > Signed-off-by: Lorenzo Pieralisi > Cc: Bjorn Helgaas > Cc: Robin Murphy > Cc: Tomasz Nowicki > Cc: Joerg Roedel > Cc: "Rafael J. Wysocki" Acked-by: Bjorn Helgaas I assume this will be merged by somebody else along with the rest of the series. > --- > drivers/acpi/glue.c | 4 ++-- > drivers/acpi/scan.c | 24 ++++++++++++++++++++++++ > drivers/pci/probe.c | 3 +-- > include/acpi/acpi_bus.h | 2 ++ > include/linux/acpi.h | 5 +++++ > 5 files changed, 34 insertions(+), 4 deletions(-) > > diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c > index 5ea5dc2..f8d6564 100644 > --- a/drivers/acpi/glue.c > +++ b/drivers/acpi/glue.c > @@ -227,8 +227,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > > attr = acpi_get_dma_attr(acpi_dev); > if (attr != DEV_DMA_NOT_SUPPORTED) > - arch_setup_dma_ops(dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(dev, attr); > > acpi_physnode_link_name(physical_node_name, node_id); > retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, > @@ -251,6 +250,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > return 0; > > err: > + acpi_dma_deconfigure(dev); > ACPI_COMPANION_SET(dev, NULL); > put_device(dev); > put_device(&acpi_dev->dev); > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 5f28cf7..b4b9064 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1358,6 +1358,30 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NON_COHERENT; > } > > +/** > + * acpi_dma_configure - Set-up DMA configuration for the device. > + * @dev: The pointer to the device > + * @attr: device dma attributes > + */ > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) > +{ > + /* > + * Assume dma valid range starts at 0 and covers the whole > + * coherent_dma_mask. > + */ > + arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, NULL, > + attr == DEV_DMA_COHERENT); > +} > + > +/** > + * acpi_dma_deconfigure - Tear-down DMA configuration for the device. > + * @dev: The pointer to the device > + */ > +void acpi_dma_deconfigure(struct device *dev) > +{ > + arch_teardown_dma_ops(dev); > +} > + > static void acpi_init_coherency(struct acpi_device *adev) > { > unsigned long long cca = 0; > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 8e3ef72..01dd369 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -1725,8 +1725,7 @@ static void pci_dma_configure(struct pci_dev *dev) > if (attr == DEV_DMA_NOT_SUPPORTED) > dev_warn(&dev->dev, "DMA not supported.\n"); > else > - arch_setup_dma_ops(&dev->dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(&dev->dev, attr); > } > > pci_put_host_bridge_device(bridge); > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 788c6c35..8b5039a 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -566,6 +566,8 @@ struct acpi_pci_root { > > bool acpi_dma_supported(struct acpi_device *adev); > enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev); > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr); > +void acpi_dma_deconfigure(struct device *dev); > > struct acpi_device *acpi_find_child_device(struct acpi_device *parent, > u64 address, bool check_children); > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 288fac5..135a452 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -676,6 +676,11 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NOT_SUPPORTED; > } > > +static inline void acpi_dma_configure(struct device *dev, > + enum dev_dma_attr attr) { } > + > +static inline void acpi_dma_deconfigure(struct device *dev) { } > + > #define ACPI_PTR(_ptr) (NULL) > > #endif /* !CONFIG_ACPI */ > -- > 2.6.4 > From mboxrd@z Thu Jan 1 00:00:00 1970 From: helgaas@kernel.org (Bjorn Helgaas) Date: Fri, 10 Jun 2016 11:25:28 -0500 Subject: [RFC PATCH v2 12/15] drivers: acpi: implement acpi_dma_configure In-Reply-To: <1465306270-27076-13-git-send-email-lorenzo.pieralisi@arm.com> References: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> <1465306270-27076-13-git-send-email-lorenzo.pieralisi@arm.com> Message-ID: <20160610162528.GI19309@localhost> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Jun 07, 2016 at 02:31:07PM +0100, Lorenzo Pieralisi wrote: > On DT based systems, the of_dma_configure() API implements DMA configuration > for a given device. On ACPI systems an API equivalent to of_dma_configure() > is missing which implies that it is currently not possible to set-up DMA > operations for devices through the ACPI generic kernel layer. > > This patch fills the gap by introducing acpi_dma_configure/deconfigure() > calls that for now are just wrappers around arch_setup_dma_ops() and > arch_teardown_dma_ops() and also updates ACPI and PCI core code to use > the newly introduced acpi_dma_configure/acpi_dma_deconfigure functions. > > The DMA range size passed to arch_setup_dma_ops() is sized according > to the device coherent_dma_mask (starting at address 0x0), mirroring the > DT probing path behaviour when a dma-ranges property is not provided > for the device being probed; this changes the current arch_setup_dma_ops() > call parameters in the ACPI probing case, but since arch_setup_dma_ops() > is a NOP on all architectures but ARM/ARM64 this patch does not change > the current kernel behaviour on them. > > Signed-off-by: Lorenzo Pieralisi > Cc: Bjorn Helgaas > Cc: Robin Murphy > Cc: Tomasz Nowicki > Cc: Joerg Roedel > Cc: "Rafael J. Wysocki" Acked-by: Bjorn Helgaas I assume this will be merged by somebody else along with the rest of the series. > --- > drivers/acpi/glue.c | 4 ++-- > drivers/acpi/scan.c | 24 ++++++++++++++++++++++++ > drivers/pci/probe.c | 3 +-- > include/acpi/acpi_bus.h | 2 ++ > include/linux/acpi.h | 5 +++++ > 5 files changed, 34 insertions(+), 4 deletions(-) > > diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c > index 5ea5dc2..f8d6564 100644 > --- a/drivers/acpi/glue.c > +++ b/drivers/acpi/glue.c > @@ -227,8 +227,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > > attr = acpi_get_dma_attr(acpi_dev); > if (attr != DEV_DMA_NOT_SUPPORTED) > - arch_setup_dma_ops(dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(dev, attr); > > acpi_physnode_link_name(physical_node_name, node_id); > retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, > @@ -251,6 +250,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) > return 0; > > err: > + acpi_dma_deconfigure(dev); > ACPI_COMPANION_SET(dev, NULL); > put_device(dev); > put_device(&acpi_dev->dev); > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 5f28cf7..b4b9064 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1358,6 +1358,30 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NON_COHERENT; > } > > +/** > + * acpi_dma_configure - Set-up DMA configuration for the device. > + * @dev: The pointer to the device > + * @attr: device dma attributes > + */ > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) > +{ > + /* > + * Assume dma valid range starts at 0 and covers the whole > + * coherent_dma_mask. > + */ > + arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, NULL, > + attr == DEV_DMA_COHERENT); > +} > + > +/** > + * acpi_dma_deconfigure - Tear-down DMA configuration for the device. > + * @dev: The pointer to the device > + */ > +void acpi_dma_deconfigure(struct device *dev) > +{ > + arch_teardown_dma_ops(dev); > +} > + > static void acpi_init_coherency(struct acpi_device *adev) > { > unsigned long long cca = 0; > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 8e3ef72..01dd369 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -1725,8 +1725,7 @@ static void pci_dma_configure(struct pci_dev *dev) > if (attr == DEV_DMA_NOT_SUPPORTED) > dev_warn(&dev->dev, "DMA not supported.\n"); > else > - arch_setup_dma_ops(&dev->dev, 0, 0, NULL, > - attr == DEV_DMA_COHERENT); > + acpi_dma_configure(&dev->dev, attr); > } > > pci_put_host_bridge_device(bridge); > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 788c6c35..8b5039a 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -566,6 +566,8 @@ struct acpi_pci_root { > > bool acpi_dma_supported(struct acpi_device *adev); > enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev); > +void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr); > +void acpi_dma_deconfigure(struct device *dev); > > struct acpi_device *acpi_find_child_device(struct acpi_device *parent, > u64 address, bool check_children); > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 288fac5..135a452 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -676,6 +676,11 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NOT_SUPPORTED; > } > > +static inline void acpi_dma_configure(struct device *dev, > + enum dev_dma_attr attr) { } > + > +static inline void acpi_dma_deconfigure(struct device *dev) { } > + > #define ACPI_PTR(_ptr) (NULL) > > #endif /* !CONFIG_ACPI */ > -- > 2.6.4 >