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* ACPI/IORT: Make dma masks set-up IORT specificLorenzo Pieralisi2016-12-061-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The introduction of acpi_dma_configure() allows to configure DMA and related IOMMU for any device that is DMA capable. To achieve that goal it ensures DMA masks are set-up to sane default values before proceeding with IOMMU and DMA ops configuration. On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is called for every device that has an ACPI companion, in that every device is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), which has the side effect of initializing dma masks also for pseudo-devices (eg CPUs and memory nodes) and potentially for devices whose dma masks were not set-up before the acpi_dma_configure() API was introduced, which may have noxious side effects. Therefore, in preparation for IORT firmware specific DMA masks set-up, wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the default expected behaviour on x86/ia64 systems and keeping DMA default masks set-up on IORT based (ie ARM) arch configurations. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Joerg Roedel <jroedel@suse.de>
* ACPI/IORT: Introduce iort_iommu_configureLorenzo Pieralisi2016-11-291-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | DT based systems have a generic kernel API to configure IOMMUs for devices (ie of_iommu_configure()). On ARM based ACPI systems, the of_iommu_configure() equivalent can be implemented atop ACPI IORT kernel API, with the corresponding functions to map device identifiers to IOMMUs and retrieve the corresponding IOMMU operations necessary for DMA operations set-up. By relying on the iommu_fwspec generic kernel infrastructure, implement the IORT based IOMMU configuration for ARM ACPI systems and hook it up in the ACPI kernel layer that implements DMA configuration for a device. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ACPI core] Reviewed-by: Tomasz Nowicki <tn@semihalf.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Tomasz Nowicki <tn@semihalf.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Will Deacon <will.deacon@arm.com>
* iommu/arm-smmu: Add IORT configurationLorenzo Pieralisi2016-11-291-0/+3
| | | | | | | | | | | | | | | | | | | | | | | In ACPI based systems, in order to be able to create platform devices and initialize them for ARM SMMU components, the IORT kernel implementation requires a set of static functions to be used by the IORT kernel layer to configure platform devices for ARM SMMU components. Add static configuration functions to the IORT kernel layer for the ARM SMMU components, so that the ARM SMMU driver can initialize its respective platform device by relying on the IORT kernel infrastructure and by adding a corresponding ACPI device early probe section entry. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Tomasz Nowicki <tn@semihalf.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Tomasz Nowicki <tn@semihalf.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Joerg Roedel <joro@8bytes.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
* ACPI/IORT: Add node match functionLorenzo Pieralisi2016-11-291-0/+2
| | | | | | | | | | | | | | | | | | | | | Device drivers (eg ARM SMMU) need to know if a specific component is part of the IORT table, so that kernel data structures are not initialized at initcalls time if the respective component is not part of the IORT table. To this end, this patch adds a trivial function that allows detecting if a given IORT node type is present or not in the ACPI table, providing an ACPI IORT equivalent for of_find_matching_node(). Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Tomasz Nowicki <tn@semihalf.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Tomasz Nowicki <tn@semihalf.com> Acked-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Will Deacon <will.deacon@arm.com>
* ACPI/IORT: Introduce linker section for IORT entries probingLorenzo Pieralisi2016-11-291-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since commit e647b532275b ("ACPI: Add early device probing infrastructure") the kernel has gained the infrastructure that allows adding linker script section entries to execute ACPI driver callbacks (ie probe routines) for all subsystems that register a table entry in the respective kernel section (eg clocksource, irqchip). Since ARM IOMMU devices data is described through IORT tables when booting with ACPI, the ARM IOMMU drivers must be made able to hook ACPI callback routines that are called to probe IORT entries and initialize the respective IOMMU devices. To avoid adding driver specific hooks into IORT table initialization code (breaking therefore code modularity - ie ACPI IORT code must be made aware of ARM SMMU drivers ACPI init callbacks), this patch adds code that allows ARM SMMU drivers to take advantage of the ACPI early probing infrastructure, so that they can add linker script section entries containing drivers callback to be executed on IORT tables detection. Since IORT nodes are differentiated by a type, the callback routines can easily parse the IORT table entries, check the IORT nodes and carry out some actions whenever the IORT node type associated with the driver specific callback is matched. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Tomasz Nowicki <tn@semihalf.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Tomasz Nowicki <tn@semihalf.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
* ACPI: Add new IORT functions to support MSI domain handlingTomasz Nowicki2016-09-121-0/+12
| | | | | | | | | | | | | | | | | | | | | | | For ITS, MSI functionality consists on building domain stack and during that process we need to reference to domain stack components e.g. before we create new DOMAIN_BUS_PCI_MSI domain we need to specify its DOMAIN_BUS_NEXUS parent domain. In order to manage that process properly, maintain list which elements contain domain token (unique for MSI domain stack) and ITS ID: iort_register_domain_token() and iort_deregister_domain_token(). Then retrieve domain token any time later with ITS ID being key off: iort_find_domain_token(). With domain token and domain type we are able to find corresponding IRQ domain. Since IORT is prepared to describe MSI domain on a per-device basis, use existing IORT helpers and implement two calls: 1. iort_msi_map_rid() to map MSI RID for a device 2. iort_get_device_domain() to find domain token for a device Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
* ACPI: I/O Remapping Table (IORT) initial supportTomasz Nowicki2016-09-121-0/+30
IORT shows representation of IO topology for ARM based systems. It describes how various components are connected together on parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec. http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf Initial support allows to detect IORT table presence and save its root pointer obtained through acpi_get_table(). The pointer validity depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap is not set while using IORT nodes we would dereference unmapped pointers. For the aforementioned reason call acpi_iort_init() from acpi_init() which guarantees acpi_gbl_permanent_mmap to be set at that point. Add generic helpers which are helpful for scanning and retrieving information from IORT table content. List of the most important helpers: - iort_find_dev_node() finds IORT node for a given device - iort_node_map_rid() maps device RID and returns IORT node which provides final translation IORT support is placed under drivers/acpi/arm64/ new directory due to its ARM64 specific nature. The code there is considered only for ARM64. The long term plan is to keep all ARM64 specific tables support in this place e.g. GTDT table. Signed-off-by: Tomasz Nowicki <tn@semihalf.com> Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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