Changes in Kconfig

150745b4 - dma-debug: remove DMA_API_DEBUG_SG

Tue, 15 Oct 2024 08:29:20 +0000

dma-debug: remove DMA_API_DEBUG_SGThe scatterlist validity checks are pretty simple and cheap, perform themunconditionally.Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

de6c85bf - dma-mapping: clearly mark DMA ops as an architecture feature

Wed, 28 Aug 2024 06:02:47 +0000

dma-mapping: clearly mark DMA ops as an architecture featureDMA ops are a helper for architectures and not for drivers to overridethe DMA implementation.Unfortunately driver authors keep ignoring this. Make the fact moreclear by renaming the symbol to ARCH_HAS_DMA_OPS and having the two driversoverriding their dma_ops depend on that. These drivers should probably bemarked broken, but we can give them a bit of a grace period for that.Signed-off-by: Christoph Hellwig Reviewed-by: Thomas Gleixner Acked-by: Sakari Ailus # for IPU6Acked-by: Robin Murphy List of files: /linux-6.15/kernel/dma/Kconfig

b5c58b2f - dma-mapping: direct calls for dma-iommu

Wed, 24 Jul 2024 18:04:49 +0000

dma-mapping: direct calls for dma-iommuDirectly call into dma-iommu just like we have been doing for dma-directfor a while. This avoids the indirect call overhead for IOMMU ops andremoves the need to have DMA ops entirely for many common configurations.Signed-off-by: Leon Romanovsky Signed-off-by: Leon Romanovsky Acked-by: Greg Kroah-Hartman Acked-by: Robin Murphy Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

fe7514b1 - dma: compile-out DMA sync op calls when not used

Tue, 07 May 2024 11:20:20 +0000

dma: compile-out DMA sync op calls when not usedSome platforms do have DMA, but DMA there is always direct and coherent.Currently, even on such platforms DMA sync operations are compiled andcalled.Add a new hidden Kconfig symbol, DMA_NEED_SYNC, and set it only wheneither sync operations are needed or there is DMA ops or swiotlbor DMA debug is enabled. Compile global dma_sync_*() and dma_need_sync()only when it's set, otherwise provide empty inline stubs.The change allows for future optimizations of DMA sync calls dependingon runtime conditions.Signed-off-by: Alexander Lobakin Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

2c8ed1b9 - dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbol

Thu, 05 Oct 2023 07:05:36 +0000

dma-direct: add a CONFIG_ARCH_HAS_DMA_ALLOC symbolInstead of using arch_dma_alloc if none of the generic coherentallocators are used, require the architectures to explicitly opt intoproviding it. This will used to deal with the case of m68knommu andcoldfire where we can't do any coherent allocations whatsoever, andalso makes it clear that arch_dma_alloc is a last resort.Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy Reviewed-by: Greg Ungerer Tested-by: Greg Ungerer List of files: /linux-6.15/kernel/dma/Kconfig

da323d46 - dma-direct: add dependencies to CONFIG_DMA_GLOBAL_POOL

Thu, 05 Oct 2023 07:06:55 +0000

dma-direct: add dependencies to CONFIG_DMA_GLOBAL_POOLCONFIG_DMA_GLOBAL_POOL can't be combined with other DMA coherentallocators. Add dependencies to Kconfig to document this, and makekconfig complain about unmet dependencies if someone tries.Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy Reviewed-by: Lad Prabhakar Reviewed-by: Greg Ungerer Tested-by: Greg Ungerer List of files: /linux-6.15/kernel/dma/Kconfig

2dcdf8c1 - dma-contiguous: fix the Kconfig entry for CONFIG_DMA_NUMA_CMA

Wed, 30 Aug 2023 09:25:25 +0000

dma-contiguous: fix the Kconfig entry for CONFIG_DMA_NUMA_CMAIt makes no sense to expose CONFIG_DMA_NUMA_CMA if CONFIG_NUMA is notenabled, and random config options shouldn't be default unless thereis a good reason. Replace the default NUMA with a depends on to fix bothissues.Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy List of files: /linux-6.15/kernel/dma/Kconfig

62708b2b - swiotlb: add a flag whether SWIOTLB is allowed to grow

Tue, 01 Aug 2023 06:24:00 +0000

swiotlb: add a flag whether SWIOTLB is allowed to growAdd a config option (CONFIG_SWIOTLB_DYNAMIC) to enable or disable dynamicallocation of additional bounce buffers.If this option is set, mark the default SWIOTLB as able to grow andrestricted DMA pools as unable.However, if the address of the default memory pool is explicitly queried,make the default SWIOTLB also unable to grow. This is currently used to setup PCI BAR movable regions on some Octeon MIPS boards which may not be ableto use a SWIOTLB pool elsewhere in physical memory. See octeon_pci_setup()for more details.If a remap function is specified, it must be also called on any dynamicallyallocated pools, but there are some issues:- The remap function may block, so it should not be called from an atomic context.- There is no corresponding unremap() function if the memory pool is freed.- The only in-tree implementation (xen_swiotlb_fixup) requires that the number of slots in the memory pool is a multiple of SWIOTLB_SEGSIZE.Keep it simple for now and disable growing the SWIOTLB if a remap functionwas specified.Signed-off-by: Petr Tesarik Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

bf29bfaa - dma-contiguous: support numa CMA for specified node

Wed, 12 Jul 2023 07:47:58 +0000

dma-contiguous: support numa CMA for specified nodeThe kernel parameter 'cma_pernuma=' only supports reserving the samesize of CMA area for each node. We need to reserve different sizes ofCMA area for specified nodes if these devices belong to different nodes.Adding another kernel parameter 'numa_cma=' to reserve CMA area forthe specified node. If we want to use one of these parameters, we need toenable DMA_NUMA_CMA.At the same time, print the node id in cma_declare_contiguous_nid() ifCONFIG_NUMA is enabled.Signed-off-by: Yajun Deng Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

22e4a348 - dma-contiguous: support per-numa CMA for all architectures

Fri, 12 May 2023 09:42:10 +0000

dma-contiguous: support per-numa CMA for all architecturesIn the commit b7176c261cdb ("dma-contiguous: provide the ability toreserve per-numa CMA"), Barry adds DMA_PERNUMA_CMA for ARM64.But this feature is architecture independent, so support per-numa CMAfor all architectures, and enable it by default if NUMA.Signed-off-by: Yajun Deng Tested-by: Yicong Yang Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

370645f4 - dma-mapping: force bouncing if the kmalloc() size is not cache-line-aligned

Mon, 12 Jun 2023 15:31:58 +0000

dma-mapping: force bouncing if the kmalloc() size is not cache-line-alignedFor direct DMA, if the size is small enough to have originated from akmalloc() cache below ARCH_DMA_MINALIGN, check its alignment againstdma_get_cache_alignment() and bounce if necessary. For larger sizes, itis the responsibility of the DMA API caller to ensure proper alignment.At this point, the kmalloc() caches are properly aligned but this willchange in a subsequent patch.Architectures can opt in by selecting DMA_BOUNCE_UNALIGNED_KMALLOC.Link: https://lkml.kernel.org/r/20230612153201.554742-15-catalin.marinas@arm.comSigned-off-by: Catalin Marinas Reviewed-by: Christoph Hellwig Reviewed-by: Robin Murphy Tested-by: Isaac J. Manjarres Cc: Alasdair Kergon Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Daniel Vetter Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Jerry Snitselaar Cc: Joerg Roedel Cc: Jonathan Cameron Cc: Jonathan Cameron Cc: Lars-Peter Clausen Cc: Logan Gunthorpe Cc: Marc Zyngier Cc: Mark Brown Cc: Mike Snitzer Cc: "Rafael J. Wysocki" Cc: Saravana Kannan Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux-6.15/kernel/dma/Kconfig

af2880ec - scatterlist: add dedicated config for DMA flags

Mon, 12 Jun 2023 15:31:56 +0000

scatterlist: add dedicated config for DMA flagsThe DMA flags field will be useful for users beyond PCI P2P, so upgrade toits own dedicated config option.[catalin.marinas@arm.com: use #ifdef CONFIG_NEED_SG_DMA_FLAGS in scatterlist.h][catalin.marinas@arm.com: update PCI_P2PDMA dma_flags comment in scatterlist.h]Link: https://lkml.kernel.org/r/20230612153201.554742-13-catalin.marinas@arm.comSigned-off-by: Robin Murphy Signed-off-by: Catalin Marinas Reviewed-by: Christoph Hellwig Tested-by: Isaac J. Manjarres Cc: Alasdair Kergon Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Daniel Vetter Cc: Greg Kroah-Hartman Cc: Herbert Xu Cc: Jerry Snitselaar Cc: Joerg Roedel Cc: Jonathan Cameron Cc: Jonathan Cameron Cc: Lars-Peter Clausen Cc: Logan Gunthorpe Cc: Marc Zyngier Cc: Mark Brown Cc: Mike Snitzer Cc: "Rafael J. Wysocki" Cc: Saravana Kannan Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux-6.15/kernel/dma/Kconfig

4d3af20e - dma-mapping: fix a Kconfig typo

Sun, 04 Jun 2023 13:50:54 +0000

dma-mapping: fix a Kconfig typo'thing' -> 'think'Signed-off-by: Sui Jingfeng Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

1d3f56b2 - dma-mapping: provide CONFIG_ARCH_DMA_DEFAULT_COHERENT

Sat, 01 Apr 2023 09:15:30 +0000

dma-mapping: provide CONFIG_ARCH_DMA_DEFAULT_COHERENTProvide a kconfig option to allow arches to manipulate defaultvalue of dma_default_coherent in Kconfig.Signed-off-by: Jiaxun Yang Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig

f5ff79fd - dma-mapping: remove CONFIG_DMA_REMAP

Sat, 26 Feb 2022 15:40:21 +0000

dma-mapping: remove CONFIG_DMA_REMAPCONFIG_DMA_REMAP is used to build a few helpers around the corevmalloc code, and to use them in case there is a highmem page indma-direct, and to make dma coherent allocations be able to usenon-contiguous pages allocations for DMA allocations in the dma-iommulayer.Right now it needs to be explicitly selected by architectures, andis only done so by architectures that require remapping to dealwith devices that are not DMA coherent. Make it unconditional forbuilds with CONFIG_MMU as it is very little extra code, but makesit much more likely that large DMA allocations succeed on x86.This fixes hot plugging a NVMe thunderbolt SSD for me, which triesto allocate a 1MB buffer that is otherwise hard to obtain due tomemory fragmentation on a heavily used laptop.Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy List of files: /linux-6.15/kernel/dma/Kconfig

f3c4b134 - swiotlb: use depends on for DMA_RESTRICTED_POOL

Fri, 27 Aug 2021 03:48:02 +0000

swiotlb: use depends on for DMA_RESTRICTED_POOLUse depends on instead of select for DMA_RESTRICTED_POOL; otherwise itwill make SWIOTLB user configurable and cause compile errors for somearch (e.g. mips).Fixes: 0b84e4f8b793 ("swiotlb: Add restricted DMA pool initialization")Acked-by: Will Deacon Reported-by: Guenter Roeck Signed-off-by: Claire Chang Signed-off-by: Konrad Rzeszutek Wilk List of files: /linux-6.15/kernel/dma/Kconfig

faf4ef82 - dma-direct: add support for dma_coherent_default_memory

Wed, 23 Jun 2021 12:21:16 +0000

dma-direct: add support for dma_coherent_default_memoryAdd an option to allocate uncached memory for dma_alloc_coherent fromthe global dma_coherent_default_memory. This will allow to movearm-nommu (and eventually other platforms) to use generic code forallocating uncached memory from a pre-populated pool.Note that this is a different pool from the one that platforms thatcan remap at runtime use for GFP_ATOMIC allocations for now, althoughthere might be opportunities to eventually end up with a common codebasefor the two use cases.Signed-off-by: Christoph Hellwig Tested-by: Dillon Min List of files: /linux-6.15/kernel/dma/Kconfig

0b84e4f8 - swiotlb: Add restricted DMA pool initialization

Sat, 19 Jun 2021 03:40:41 +0000

swiotlb: Add restricted DMA pool initializationAdd the initialization function to create restricted DMA pools frommatching reserved-memory nodes.Regardless of swiotlb setting, the restricted DMA pool is preferred ifavailable.The restricted DMA pools provide a basic level of protection against theDMA overwriting buffer contents at unexpected times. However, to protectagainst general data leakage and system memory corruption, the systemneeds to provide a way to lock down the memory access, e.g., MPU.Signed-off-by: Claire Chang Reviewed-by: Christoph Hellwig Tested-by: Stefano Stabellini Tested-by: Will Deacon Signed-off-by: Konrad Rzeszutek Wilk List of files: /linux-6.15/kernel/dma/Kconfig

6d4e9a8e - driver core: lift dma_default_coherent into common code

Wed, 10 Feb 2021 09:56:39 +0000

driver core: lift dma_default_coherent into common codeLift the dma_default_coherent variable from the mips architecture codeto the driver core. This allows an architecture to sdefault all deviceto be DMA coherent at run time, even if the kernel is build with supportfor DMA noncoherent device. By allowing device_initialize to set the->dma_coherent field to this default the amount of arch hooks requiredfor this behavior can be greatly reduced.Signed-off-by: Christoph Hellwig Acked-by: Greg Kroah-Hartman Signed-off-by: Thomas Bogendoerfer List of files: /linux-6.15/kernel/dma/Kconfig

65789daa - dma-mapping: add benchmark support for streaming DMA APIs

Mon, 16 Nov 2020 06:08:47 +0000

dma-mapping: add benchmark support for streaming DMA APIsNowadays, there are increasing requirements to benchmark the performanceof dma_map and dma_unmap particually while the device is attached to anIOMMU.This patch enables the support. Users can run specified number of threadsto do dma_map_page and dma_unmap_page on a specific NUMA node with thespecified duration. Then dma_map_benchmark will calculate the averagelatency for map and unmap.A difficulity for this benchmark is that dma_map/unmap APIs must run ona particular device. Each device might have different backend of IOMMU ornon-IOMMU.So we use the driver_override to bind dma_map_benchmark to a particualdevice by:For platform devices:echo dma_map_benchmark > /sys/bus/platform/devices/xxx/driver_overrideecho xxx > /sys/bus/platform/drivers/xxx/unbindecho xxx > /sys/bus/platform/drivers/dma_map_benchmark/bindFor PCI devices:echo dma_map_benchmark > /sys/bus/pci/devices/0000:00:01.0/driver_overrideecho 0000:00:01.0 > /sys/bus/pci/drivers/xxx/unbindecho 0000:00:01.0 > /sys/bus/pci/drivers/dma_map_benchmark/bindCc: Will Deacon Cc: Shuah Khan Cc: Christoph Hellwig Cc: Marek Szyprowski Cc: Robin Murphy Signed-off-by: Barry Song [hch: folded in two fixes from Colin Ian King ]Signed-off-by: Christoph Hellwig List of files: /linux-6.15/kernel/dma/Kconfig