On Fri, Jun 19, 2020 at 09:20:06AM +0100, Lorenzo Pieralisi wrote:
> Some HW devices are created as child devices of proprietary busses,
> that have a bus specific policy defining how the child devices
> wires representing the devices ID are translated into IOMMU and
> IRQ controllers device IDs.
>
> Current IORT code provides translations for:
>
> - PCI devices, where the device ID is well identified at bus level
> as the requester ID (RID)
> - Platform devices that are endpoint devices where the device ID is
> retrieved from the ACPI object IORT mappings (Named components single
> mappings). A platform device is represented in IORT as a named
> component node
>
> For devices that are child devices of proprietary busses the IORT
> firmware represents the bus node as a named component node in IORT
> and it is up to that named component node to define in/out bus
> specific ID translations for the bus child devices that are
> allocated and created in a bus specific manner.
>
> In order to make IORT ID translations available for proprietary
> bus child devices, the current ACPI (and IORT) code must be
> augmented to provide an additional ID parameter to acpi_dma_configure()
> representing the child devices input ID. This ID is bus specific
> and it is retrieved in bus specific code.
>
> By adding an ID parameter to acpi_dma_configure(), the IORT
> code can map the child device ID to an IOMMU stream ID through
> the IORT named component representing the bus in/out ID mappings.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
> Cc: Will Deacon <w...@kernel.org>
> Cc: Hanjun Guo <guohan...@huawei.com>
> Cc: Sudeep Holla <sudeep.ho...@arm.com>
> Cc: Catalin Marinas <catalin.mari...@arm.com>
> Cc: Robin Murphy <robin.mur...@arm.com>
> Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
> ---
> drivers/acpi/arm64/iort.c | 59 +++++++++++++++++++++++++++++----------
> drivers/acpi/scan.c | 8 ++++--
> include/acpi/acpi_bus.h | 9 ++++--
> include/linux/acpi.h | 7 +++++
> include/linux/acpi_iort.h | 7 +++--
> 5 files changed, 67 insertions(+), 23 deletions(-)
Hi Rafael,
just to ask if the ACPI core changes in this patch are OK with you,
thank you very much.
Lorenzo
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 421c6976ab81..ec782e4a0fe4 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -978,19 +978,54 @@ static void iort_named_component_init(struct device
> *dev,
> nc->node_flags);
> }
>
> +static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node)
> +{
> + struct acpi_iort_node *parent;
> + int err = -ENODEV, i = 0;
> + u32 streamid = 0;
> +
> + do {
> +
> + parent = iort_node_map_platform_id(node, &streamid,
> + IORT_IOMMU_TYPE,
> + i++);
> +
> + if (parent)
> + err = iort_iommu_xlate(dev, parent, streamid);
> + } while (parent && !err);
> +
> + return err;
> +}
> +
> +static int iort_nc_iommu_map_id(struct device *dev,
> + struct acpi_iort_node *node,
> + const u32 *in_id)
> +{
> + struct acpi_iort_node *parent;
> + u32 streamid;
> +
> + parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE);
> + if (parent)
> + return iort_iommu_xlate(dev, parent, streamid);
> +
> + return -ENODEV;
> +}
> +
> +
> /**
> - * iort_iommu_configure - Set-up IOMMU configuration for a device.
> + * iort_iommu_configure_id - Set-up IOMMU configuration for a device.
> *
> * @dev: device to configure
> + * @id_in: optional input id const value pointer
> *
> * Returns: iommu_ops pointer on configuration success
> * NULL on configuration failure
> */
> -const struct iommu_ops *iort_iommu_configure(struct device *dev)
> +const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
> + const u32 *id_in)
> {
> - struct acpi_iort_node *node, *parent;
> + struct acpi_iort_node *node;
> const struct iommu_ops *ops;
> - u32 streamid = 0;
> int err = -ENODEV;
>
> /*
> @@ -1019,21 +1054,13 @@ const struct iommu_ops *iort_iommu_configure(struct
> device *dev)
> if (fwspec && iort_pci_rc_supports_ats(node))
> fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
> } else {
> - int i = 0;
> -
> node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> iort_match_node_callback, dev);
> if (!node)
> return NULL;
>
> - do {
> - parent = iort_node_map_platform_id(node, &streamid,
> - IORT_IOMMU_TYPE,
> - i++);
> -
> - if (parent)
> - err = iort_iommu_xlate(dev, parent, streamid);
> - } while (parent && !err);
> + err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) :
> + iort_nc_iommu_map(dev, node);
>
> if (!err)
> iort_named_component_init(dev, node);
> @@ -1058,6 +1085,7 @@ const struct iommu_ops *iort_iommu_configure(struct
> device *dev)
>
> return ops;
> }
> +
> #else
> static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device
> *dev)
> { return NULL; }
> @@ -1066,7 +1094,8 @@ static inline int iort_add_device_replay(const struct
> iommu_ops *ops,
> { return 0; }
> int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head
> *head)
> { return 0; }
> -const struct iommu_ops *iort_iommu_configure(struct device *dev)
> +const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
> + const u32 *input_id)
> { return NULL; }
> #endif
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 8777faced51a..2142f1554761 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1457,8 +1457,10 @@ int acpi_dma_get_range(struct device *dev, u64
> *dma_addr, u64 *offset,
> * acpi_dma_configure - Set-up DMA configuration for the device.
> * @dev: The pointer to the device
> * @attr: device dma attributes
> + * @input_id: input device id const value pointer
> */
> -int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
> +int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
> + const u32 *input_id)
> {
> const struct iommu_ops *iommu;
> u64 dma_addr = 0, size = 0;
> @@ -1470,7 +1472,7 @@ int acpi_dma_configure(struct device *dev, enum
> dev_dma_attr attr)
>
> iort_dma_setup(dev, &dma_addr, &size);
>
> - iommu = iort_iommu_configure(dev);
> + iommu = iort_iommu_configure_id(dev, input_id);
> if (PTR_ERR(iommu) == -EPROBE_DEFER)
> return -EPROBE_DEFER;
>
> @@ -1479,7 +1481,7 @@ int acpi_dma_configure(struct device *dev, enum
> dev_dma_attr attr)
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(acpi_dma_configure);
> +EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
>
> static void acpi_init_coherency(struct acpi_device *adev)
> {
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 5afb6ceb284f..a3abcc4b7d9f 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -588,8 +588,13 @@ bool acpi_dma_supported(struct acpi_device *adev);
> enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
> int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
> u64 *size);
> -int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr);
> -
> +int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
> + const u32 *input_id);
> +static inline int acpi_dma_configure(struct device *dev,
> + enum dev_dma_attr attr)
> +{
> + return acpi_dma_configure_id(dev, attr, NULL);
> +}
> struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
> u64 address, bool check_children);
> int acpi_is_root_bridge(acpi_handle);
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index d661cd0ee64d..6d2c47489d90 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -905,6 +905,13 @@ static inline int acpi_dma_configure(struct device *dev,
> return 0;
> }
>
> +static inline int acpi_dma_configure_id(struct device *dev,
> + enum dev_dma_attr attr,
> + const u32 *input_id)
> +{
> + return 0;
> +}
> +
> #define ACPI_PTR(_ptr) (NULL)
>
> static inline void acpi_device_set_enumerated(struct acpi_device *adev)
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index e51425e083da..20a32120bb88 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -35,7 +35,8 @@ void acpi_configure_pmsi_domain(struct device *dev);
> int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
> /* IOMMU interface */
> void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size);
> -const struct iommu_ops *iort_iommu_configure(struct device *dev);
> +const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
> + const u32 *id_in);
> int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head
> *head);
> #else
> static inline void acpi_iort_init(void) { }
> @@ -48,8 +49,8 @@ static inline void acpi_configure_pmsi_domain(struct device
> *dev) { }
> /* IOMMU interface */
> static inline void iort_dma_setup(struct device *dev, u64 *dma_addr,
> u64 *size) { }
> -static inline const struct iommu_ops *iort_iommu_configure(
> - struct device *dev)
> +static inline const struct iommu_ops *iort_iommu_configure_id(
> + struct device *dev, const u32 *id_in)
> { return NULL; }
> static inline
> int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head
> *head)
> --
> 2.26.1
>
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