Add support for ARC-1886 series RAID controllers

Backport upstream commits between 4.19 and 5.10-rc1 upstream for supporting Areca ARC-1886 series RAID controllers, including one bugfix in later series (5.14-rc1, but backported to 5.10.52).

• scsi: arcmsr: use dma_set_mask
• scsi: arcmsr: Rename acb structure member roundup_ccbsize to ioqueue_size
• scsi: arcmsr: Rename arcmsr_free_mu to arcmsr_free_io_queue
• scsi: arcmsr: Merge arcmsr_alloc_io_queue to arcmsr_alloc_ccb_pool
• scsi: arcmsr: Update arcmsr_alloc_ccb_pool for ccb buffer address above 4GB
• scsi: arcmsr: Update ACB_ADAPTER_TYPE_A for >4GB ccb addressing
• scsi: arcmsr: Update ACB_ADAPTER_TYPE_B for >4GB ccb addressing
• scsi: arcmsr: Update ACB_ADAPTER_TYPE_C for >4GB ccb addressing
• scsi: arcmsr: Update ACB_ADAPTER_TYPE_D for >4GB ccb addressing
• scsi: arcmsr: Add an option of set dma_mask_64 for ACB_ADAPTER_TYPE_A
• scsi: arcmsr: Separate 'set dma mask' as a function
• scsi: arcmsr: Fix suspend/resume of ACB_ADAPTER_TYPE_B
• scsi: arcmsr: Use dma_alloc_coherent to replace dma_zalloc_coherent
• scsi: arcmsr: Fix suspend/resume of ACB_ADAPTER_TYPE_B part 2
• scsi: arcmsr: fix indentation issues
• scsi: arcmsr: Remove some set but unused variables
• scsi: arcmsr: arcmsr_hba: Remove statement with no effect
• scsi: arcmsr: Remove unnecessary syntax
• scsi: arcmsr: Fix device hot-plug monitoring timer stop
• scsi: arcmsr: Add support for ARC-1886 series RAID controllers
• scsi: arcmsr: Fix doorbell status being updated late on ARC-1886

Closes: #1011295

changed the description

@benh: While still in Draft state, do you think we still can add support here for such controller? Or are you seeing it already as too risky? I was able to test a kernel build based on 4.19.y with those patches on top on a

41:00.0 RAID bus controller [0104]: Areca Technology Corp. ARC-1886 series PCIe 4.0 to NVMe/SAS/SATA 16/12/6Gb RAID Controller [17d3:188a]
        Subsystem: Areca Technology Corp. ARC-1886 series PCIe 4.0 to NVMe/SAS/SATA 16/12/6Gb RAID Controller [17d3:1886]

What I can come up as potential problem is if later 4.19.y stable update in drivers/scsi/arcmsr would conflict with the set of backports.

added 1 commit

• a6d172c5 - Add support for ARC-1886 series RAID controllers

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changed the description

marked this merge request as ready

@benh, hope this is fine to add you at least as reviewer for this. A second pair of eyes is more than welcome here.

requested review from @benh

resolved all threads

Sorry for not taking the time to review this when you opened it.

As buster is now in LTS and Linux 5.10 is supported there, is there still a need for this backport to 4.19?

@benh: I guess we can close it in case you do not want to add additional HW support in 4.19 anymore in LTS, and right 5.10 would support it for those cases.

closed