kernel/arch/powerpc/platforms/pseries/vio.c, branch linux-6.2.y

powerpc: Add missing headers

2022-05-08T12:15:40Z

Don't inherit headers "by chances" from asm/prom.h, asm/mpc52xx.h, asm/pci.h etc... Include the needed headers, and remove asm/prom.h when it was needed exclusively for pulling necessary headers. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/be8bdc934d152a7d8ee8d1a840d5596e2f7d85e0.1646767214.git.christophe.leroy@csgroup.eu

powerpc/pseries: Add __init attribute to eligible functions

2021-12-23T11:33:15Z

Some functions defined in 'arch/powerpc/platforms/pseries' are deserving of an `__init` macro attribute. These functions are only called by other initialization functions and therefore should inherit the attribute. Also, change function declarations in header files to include `__init`. Signed-off-by: Nick Child Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211216220035.605465-13-nick.child@ibm.com

Merge tag 'dma-mapping-5.15' of git://git.infradead.org/users/hch/dma-mapping

2021-09-02T17:32:06Z

Pull dma-mapping updates from Christoph Hellwig: - fix debugfs initialization order (Anthony Iliopoulos) - use memory_intersects() directly (Kefeng Wang) - allow to return specific errors from ->map_sg (Logan Gunthorpe, Martin Oliveira) - turn the dma_map_sg return value into an unsigned int (me) - provide a common global coherent pool іmplementation (me) * tag 'dma-mapping-5.15' of git://git.infradead.org/users/hch/dma-mapping: (31 commits) hexagon: use the generic global coherent pool dma-mapping: make the global coherent pool conditional dma-mapping: add a dma_init_global_coherent helper dma-mapping: simplify dma_init_coherent_memory dma-mapping: allow using the global coherent pool for !ARM ARM/nommu: use the generic dma-direct code for non-coherent devices dma-direct: add support for dma_coherent_default_memory dma-mapping: return an unsigned int from dma_map_sg{,_attrs} dma-mapping: disallow .map_sg operations from returning zero on error dma-mapping: return error code from dma_dummy_map_sg() x86/amd_gart: don't set failed sg dma_address to DMA_MAPPING_ERROR x86/amd_gart: return error code from gart_map_sg() xen: swiotlb: return error code from xen_swiotlb_map_sg() parisc: return error code from .map_sg() ops sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR sparc/iommu: return error codes from .map_sg() ops s390/pci: don't set failed sg dma_address to DMA_MAPPING_ERROR s390/pci: return error code from s390_dma_map_sg() powerpc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR powerpc/iommu: return error code from .map_sg() ops ...

powerpc/iommu: return error code from .map_sg() ops

2021-08-09T15:13:05Z

The .map_sg() op now expects an error code instead of zero on failure. Propagate the error up if vio_dma_iommu_map_sg() fails. ppc_iommu_map_sg() may fail either because of iommu_range_alloc() or because of tbl->it_ops->set(). The former only supports returning an error with DMA_MAPPING_ERROR and an examination of the latter indicates that it may return arch-specific errors (for example, tce_buildmulti_pSeriesLP()). Hence, coalesce all of those errors into -EIO, per the documentation on dma_map_sgtable(). Signed-off-by: Martin Oliveira Signed-off-by: Logan Gunthorpe Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Geoff Levand Signed-off-by: Christoph Hellwig

bus: Make remove callback return void

2021-07-21T09:53:42Z

The driver core ignores the return value of this callback because there is only little it can do when a device disappears. This is the final bit of a long lasting cleanup quest where several buses were converted to also return void from their remove callback. Additionally some resource leaks were fixed that were caused by drivers returning an error code in the expectation that the driver won't go away. With struct bus_type::remove returning void it's prevented that newly implemented buses return an ignored error code and so don't anticipate wrong expectations for driver authors. Reviewed-by: Tom Rix (For fpga) Reviewed-by: Mathieu Poirier Reviewed-by: Cornelia Huck (For drivers/s390 and drivers/vfio) Acked-by: Russell King (Oracle) (For ARM, Amba and related parts) Acked-by: Mark Brown Acked-by: Chen-Yu Tsai (for sunxi-rsb) Acked-by: Pali Rohár Acked-by: Mauro Carvalho Chehab (for media) Acked-by: Hans de Goede (For drivers/platform) Acked-by: Alexandre Belloni Acked-By: Vinod Koul Acked-by: Juergen Gross (For xen) Acked-by: Lee Jones (For mfd) Acked-by: Johannes Thumshirn (For mcb) Acked-by: Johan Hovold Acked-by: Srinivas Kandagatla (For slimbus) Acked-by: Kirti Wankhede (For vfio) Acked-by: Maximilian Luz Acked-by: Heikki Krogerus (For ulpi and typec) Acked-by: Samuel Iglesias Gonsálvez (For ipack) Acked-by: Geoff Levand (For ps3) Acked-by: Yehezkel Bernat (For thunderbolt) Acked-by: Alexander Shishkin (For intel_th) Acked-by: Dominik Brodowski (For pcmcia) Acked-by: Rafael J. Wysocki (For ACPI) Acked-by: Bjorn Andersson (rpmsg and apr) Acked-by: Srinivas Pandruvada (For intel-ish-hid) Acked-by: Dan Williams (For CXL, DAX, and NVDIMM) Acked-by: William Breathitt Gray (For isa) Acked-by: Stefan Richter (For firewire) Acked-by: Benjamin Tissoires (For hid) Acked-by: Thorsten Scherer (For siox) Acked-by: Sven Van Asbroeck (For anybuss) Acked-by: Ulf Hansson (For MMC) Acked-by: Wolfram Sang # for I2C Acked-by: Sudeep Holla Acked-by: Geert Uytterhoeven Acked-by: Dmitry Torokhov Acked-by: Finn Thain Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de Signed-off-by: Greg Kroah-Hartman

powerpc/pseries: Add shutdown() to vio_driver and vio_bus

2021-04-20T04:22:24Z

Currently, neither the vio_bus or vio_driver structures provide support for a shutdown() routine. Add support for shutdown() by allowing drivers to provide a implementation via function pointer in their vio_driver struct and provide a proper implementation in the driver template for the vio_bus that calls a vio drivers shutdown() if defined. In the case that no shutdown() is defined by a vio driver and a kexec is in progress we implement a big hammer that calls remove() to ensure no further DMA for the devices is possible. Signed-off-by: Tyrel Datwyler Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210402001325.939668-1-tyreld@linux.ibm.com

powerpc/pseries: Only register vio drivers if vio bus exists

2021-03-31T03:32:58Z

The vio bus is a fake bus, which we use on pseries LPARs (guests) to discover devices provided by the hypervisor. There's no need or sense in creating the vio bus on bare metal systems. Which is why commit 4336b9337824 ("powerpc/pseries: Make vio and ibmebus initcalls pseries specific") made the initialisation of the vio bus only happen in LPARs. However as a result of that commit we now see errors at boot on bare metal systems: Driver 'hvc_console' was unable to register with bus_type 'vio' because the bus was not initialized. Driver 'tpm_ibmvtpm' was unable to register with bus_type 'vio' because the bus was not initialized. This happens because those drivers are built-in, and are calling vio_register_driver(). It in turn calls driver_register() with a reference to vio_bus_type, but we haven't registered vio_bus_type with the driver core. Fix it by also guarding vio_register_driver() with a check to see if we are on pseries. Fixes: 4336b9337824 ("powerpc/pseries: Make vio and ibmebus initcalls pseries specific") Reported-by: Paul Menzel Signed-off-by: Michael Ellerman Tested-by: Paul Menzel Reviewed-by: Tyrel Datwyler Link: https://lore.kernel.org/r/20210316010938.525657-1-mpe@ellerman.id.au

vio: make remove callback return void

2021-03-02T11:41:23Z

The driver core ignores the return value of struct bus_type::remove() because there is only little that can be done. To simplify the quest to make this function return void, let struct vio_driver::remove() return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea. Note there are two nominally different implementations for a vio bus: one in arch/sparc/kernel/vio.c and the other in arch/powerpc/platforms/pseries/vio.c. This patch only adapts the powerpc one. Before this patch for a device that was bound to a driver without a remove callback vio_cmo_bus_remove(viodev) wasn't called. As the device core still considers the device unbound after vio_bus_remove() returns calling this unconditionally is the consistent behaviour which is implemented here. Signed-off-by: Uwe Kleine-König Reviewed-by: Tyrel Datwyler Acked-by: Lijun Pan Acked-by: Greg Kroah-Hartman [mpe: Drop unneeded hvcs_remove() forward declaration, squash in change from sfr to drop ibmvnic_remove() forward declaration] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210225221834.160083-1-uwe@kleine-koenig.org

dma-mapping: split

2020-10-06T05:07:03Z

Split out all the bits that are purely for dma_map_ops implementations and related code into a new header so that they don't get pulled into all the drivers. That also means the architecture specific is not pulled in by any more, which leads to a missing includes that were pulled in by the x86 or arm versions in a few not overly portable drivers. Signed-off-by: Christoph Hellwig

dma-mapping: add a new dma_alloc_pages API

2020-09-25T04:20:47Z

This API is the equivalent of alloc_pages, except that the returned memory is guaranteed to be DMA addressable by the passed in device. The implementation will also be used to provide a more sensible replacement for DMA_ATTR_NON_CONSISTENT flag. Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages as its backend. Signed-off-by: Christoph Hellwig Acked-by: Thomas Bogendoerfer (MIPS part)