linux/kernel/dma, branch v6.0

dma-mapping: mark dma_supported static

2022-09-07T08:38:28Z

Now that the remaining users in drivers are gone, this function can be marked static. Signed-off-by: Christoph Hellwig

swiotlb: fix a typo

2022-09-07T08:38:16Z

"overwirte" isn't a word. It should be "overwrite". Signed-off-by: Chao Gao Signed-off-by: Christoph Hellwig

swiotlb: avoid potential left shift overflow

2022-09-07T08:38:16Z

The second operand passed to slot_addr() is declared as int or unsigned int in all call sites. The left-shift to get the offset of a slot can overflow if swiotlb size is larger than 4G. Convert the macro to an inline function and declare the second argument as phys_addr_t to avoid the potential overflow. Fixes: 26a7e094783d ("swiotlb: refactor swiotlb_tbl_map_single") Signed-off-by: Chao Gao Reviewed-by: Dongli Zhang Signed-off-by: Christoph Hellwig

dma-debug: improve search for partial syncs

2022-09-07T08:38:16Z

When bucket_find_contains() tries to find the original entry for a partial sync, it manages to constrain its search in a way that is both too restrictive and not restrictive enough. A driver which only uses single mappings rather than scatterlists might not set max_seg_size, but could still technically perform a partial sync at an offset of more than 64KB into a sufficiently large mapping, so we could stop searching too early before reaching a legitimate entry. Conversely, if no valid entry is present and max_range is large enough, we can pointlessly search buckets that we've already searched, or that represent an impossible wrapping around the bottom of the address space. At worst, the (legitimate) case of max_seg_size == UINT_MAX can make the loop infinite. Replace the fragile and frankly hard-to-follow "range" logic with a simple counted loop for the number of possible hash buckets below the given address. Reported-by: Yunfei Wang Signed-off-by: Robin Murphy Signed-off-by: Christoph Hellwig

Revert "swiotlb: panic if nslabs is too small"

2022-09-07T08:38:16Z

This reverts commit 0bf28fc40d89b1a3e00d1b79473bad4e9ca20ad1. Reasons: 1. new panic()s shouldn't be added [1]. 2. It does no "cleanup" but breaks MIPS [2]. v2: properly solved the conflict [3] with commit 20347fca71a38 ("swiotlb: split up the global swiotlb lock") Reported-by: kernel test robot Reported-by: Dan Carpenter [1] https://lore.kernel.org/r/CAHk-=wit-DmhMfQErY29JSPjFgebx_Ld+pnerc4J2Ag990WwAA@mail.gmail.com/ [2] https://lore.kernel.org/r/20220820012031.1285979-1-yuzhao@google.com/ [3] https://lore.kernel.org/r/202208310701.LKr1WDCh-lkp@intel.com/ Fixes: 0bf28fc40d89b ("swiotlb: panic if nslabs is too small") Signed-off-by: Yu Zhao Signed-off-by: Christoph Hellwig

Merge tag 'rproc-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux

2022-08-08T22:16:29Z

Pull remoteproc updates from Bjorn Andersson: "This introduces support for the remoteproc on Mediatek MT8188, and enables caches for MT8186 SCP. It adds support for PRU cores found on the TI K3 AM62x SoCs. It moves the recovery work after a firmware crash to an unbound workqueue, to allow recovery to happen in parallel. A new DMA API is introduced to release dma_mem for a device. It adds support a panic handler for the Qualcomm modem remoteproc, with the goal of having caches flushed in memory dumps for post-mortem debugging and it introduces a mechanism to wait for the modem firmware on SM8450 to decrypt part of its memory for post-mortem debugging. Qualcomm sysmon is restricted to only inform remote processors about peers that are actually running, to avoid a race where Linux tries to notify a recovering remote processor about its peers new state. A mechanism for waiting for the sysmon connection to be established is also introduced, to avoid out-of-sync updates for rapidly restarting remote processors. A number of Devicetree binding cleanups and conversions to YAML are introduced, to facilitate Devicetree validation. Lastly it introduces a number of smaller fixes and cleanups in the core and a few different drivers" * tag 'rproc-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux: (42 commits) remoteproc: qcom_q6v5_pas: Do not fail if regulators are not found drivers/remoteproc: fix repeated words in comments remoteproc: Directly use ida_alloc()/free() remoteproc: Use unbounded workqueue for recovery work remoteproc: using pm_runtime_resume_and_get instead of pm_runtime_get_sync remoteproc: qcom_q6v5_pas: Deal silently with optional px and cx regulators remoteproc: sysmon: Send sysmon state only for running rprocs remoteproc: sysmon: Wait for SSCTL service to come up remoteproc: qcom: q6v5: Set q6 state to offline on receiving wdog irq remoteproc: qcom: pas: Check if coredump is enabled remoteproc: qcom: pas: Mark devices as wakeup capable remoteproc: qcom: pas: Mark va as io memory remoteproc: qcom: pas: Add decrypt shutdown support for modem remoteproc: qcom: q6v5-mss: add powerdomains to MSM8996 config remoteproc: qcom_q6v5: Introduce panic handler for MSS remoteproc: qcom_q6v5_mss: Update MBA log info remoteproc: qcom: correct kerneldoc remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use remoteproc: qcom: using pm_runtime_resume_and_get to simplify the code remoteproc: mediatek: Support MT8188 SCP ...

Merge tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping

2022-08-06T17:56:45Z

Pull dma-mapping updates from Christoph Hellwig: - convert arm32 to the common dma-direct code (Arnd Bergmann, Robin Murphy, Christoph Hellwig) - restructure the PCIe peer to peer mapping support (Logan Gunthorpe) - allow the IOMMU code to communicate an optional DMA mapping length and use that in scsi and libata (John Garry) - split the global swiotlb lock (Tianyu Lan) - various fixes and cleanup (Chao Gao, Dan Carpenter, Dongli Zhang, Lukas Bulwahn, Robin Murphy) * tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping: (45 commits) swiotlb: fix passing local variable to debugfs_create_ulong() dma-mapping: reformat comment to suppress htmldoc warning PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg() RDMA/rw: drop pci_p2pdma_[un]map_sg() RDMA/core: introduce ib_dma_pci_p2p_dma_supported() nvme-pci: convert to using dma_map_sgtable() nvme-pci: check DMA ops when indicating support for PCI P2PDMA iommu/dma: support PCI P2PDMA pages in dma-iommu map_sg iommu: Explicitly skip bus address marked segments in __iommu_map_sg() dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support dma-direct: support PCI P2PDMA pages in dma-direct map_sg dma-mapping: allow EREMOTEIO return code for P2PDMA transfers PCI/P2PDMA: Introduce helpers for dma_map_sg implementations PCI/P2PDMA: Attempt to set map_type if it has not been set lib/scatterlist: add flag for indicating P2PDMA segments in an SGL swiotlb: clean up some coding style and minor issues dma-mapping: update comment after dmabounce removal scsi: sd: Add a comment about limiting max_sectors to shost optimal limit ata: libata-scsi: cap ata_device->max_sectors according to shost->max_sectors scsi: scsi_transport_sas: cap shost opt_sectors according to DMA optimal limit ...

swiotlb: fix passing local variable to debugfs_create_ulong()

2022-07-28T14:23:30Z

Debugfs node will be run-timely checked and so local variable should be not passed to debugfs_create_ulong(). Fix it via debugfs_create_file() to create io_tlb_used node and calculate used io tlb number with fops_io_tlb_used attribute. Fixes: 20347fca71a3 ("swiotlb: split up the global swiotlb lock") Signed-off-by: Tianyu Lan Signed-off-by: Christoph Hellwig

dma-mapping: reformat comment to suppress htmldoc warning

2022-07-28T14:21:33Z

make html doc reports a cryptic warning with the commit named below: kernel/dma/mapping.c:258: WARNING: Option list ends without a blank line; unexpected unindent. Seems the parser is a bit fussy about the tabbing and having a single space tab causes the warning. To suppress the warning add another tab to the list and reindent everything. Fixes: 7c2645a2a30a ("dma-mapping: allow EREMOTEIO return code for P2PDMA transfers") Signed-off-by: Logan Gunthorpe Signed-off-by: Christoph Hellwig

dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support

2022-07-26T11:27:48Z

Add a flags member to the dma_map_ops structure with one flag to indicate support for PCI P2PDMA. Also, add a helper to check if a device supports PCI P2PDMA. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Christoph Hellwig Signed-off-by: Christoph Hellwig