Messages in this thread | | | Subject | Re: [PATCH v5 05/14] ACPI: platform-msi: retrieve dev id from IORT | From | Xinwei Kong <> | Date | Fri, 30 Dec 2016 16:57:25 +0800 |
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On 2016/12/22 13:35, Hanjun Guo wrote: > From: Hanjun Guo <hanjun.guo@linaro.org> > > For devices connecting to ITS, it needs dev id to identify > itself, and this dev id is represented in the IORT table in > named componant node [1] for platform devices, so in this > patch we will scan the IORT to retrieve device's dev id. > > Introduce iort_pmsi_get_dev_id() with pointer dev passed > in for that purpose. > > [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf > > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> > Tested-by: Sinan Kaya <okaya@codeaurora.org> > Cc: Marc Zyngier <marc.zyngier@arm.com> > Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Tomasz Nowicki <tn@semihalf.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > --- > drivers/acpi/arm64/iort.c | 26 ++++++++++++++++++++++++++ > drivers/irqchip/irq-gic-v3-its-platform-msi.c | 4 +++- > include/linux/acpi_iort.h | 8 ++++++++ > 3 files changed, 37 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index 174e983..ab7bae7 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -444,6 +444,32 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id) > } > > /** > + * iort_pmsi_get_dev_id() - Get the device id for a device > + * @dev: The device for which the mapping is to be done. > + * @dev_id: The device ID found. > + * > + * Returns: 0 for successful find a dev id, errors otherwise > + */ > +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) > +{ > + struct acpi_iort_node *node; > + > + if (!iort_table) > + return -ENODEV; > + > + node = iort_find_dev_node(dev); > + if (!node) { > + dev_err(dev, "can't find related IORT node\n"); > + return -ENODEV; > + } > + > + if(!iort_node_get_id(node, dev_id, IORT_MSI_TYPE, 0)) > + return -ENODEV; > + > + return 0; > +} > + > +/** > * iort_dev_find_its_id() - Find the ITS identifier for a device > * @dev: The device. > * @req_id: Device's Requster ID > diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c > index 3c94278..16587a9 100644 > --- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c > +++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c > @@ -15,6 +15,7 @@ > * along with this program. If not, see <http://www.gnu.org/licenses/>. > */ > > +#include <linux/acpi_iort.h> > #include <linux/device.h> > #include <linux/msi.h> > #include <linux/of.h> > @@ -56,7 +57,8 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, > > msi_info = msi_get_domain_info(domain->parent); > > - ret = of_pmsi_get_dev_id(domain, dev, &dev_id); > + ret = dev->of_node ? of_pmsi_get_dev_id(domain, dev, &dev_id) : > + iort_pmsi_get_dev_id(dev, &dev_id); > if (ret) > return ret; > > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > index 77e0809..ef99fd52 100644 > --- a/include/linux/acpi_iort.h > +++ b/include/linux/acpi_iort.h > @@ -33,6 +33,7 @@ > void acpi_iort_init(void); > bool iort_node_match(u8 type); > u32 iort_msi_map_rid(struct device *dev, u32 req_id); > +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); > struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); > /* IOMMU interface */ > void iort_set_dma_mask(struct device *dev); > @@ -42,9 +43,16 @@ static inline void acpi_iort_init(void) { } > static inline bool iort_node_match(u8 type) { return false; } > static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id) > { return req_id; } > + > static inline struct irq_domain *iort_get_device_domain(struct device *dev, > u32 req_id) > { return NULL; } > + > +static inline int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) > +{ > + return -ENODEV; > +} > + > /* IOMMU interface */ > static inline void iort_set_dma_mask(struct device *dev) { } > static inline Tested-by: Xinwei Kong <kong.kongxinwei@hisilicon.com>
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