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The dcssblk driver has long needed special case supoprt to enable limited dax operation, so called CONFIG_FS_DAX_LIMITED. This mode works around the incomplete support for ZONE_DEVICE on s390 by forgoing the ability of dax-mapped pages to support GUP. Now, pending cleanups to fsdax that fix its reference counting [1] depend on the ability of all dax drivers to supply ZONE_DEVICE pages. To allow that work to move forward, dax support needs to be paused for dcssblk until ZONE_DEVICE support arrives. That work has been known for a few years [2], and the removal of "pte_devmap" requirements [3] makes the conversion easier. For now, place the support behind CONFIG_BROKEN, and remove PFN_SPECIAL (dcssblk was the only user). Link: http://lore.kernel.org/cover.9f0e45d52f5cff58807831b6b867084d0b14b61c.1725941415.git-series.apopple@nvidia.com [1] Link: http://lore.kernel.org/20210820210318.187742e8@thinkpad/ [2] Link: http://lore.kernel.org/4511465a4f8429f45e2ac70d2e65dc5e1df1eb47.1725941415.git-series.apopple@nvidia.com [3] Link: https://lkml.kernel.org/r/33eef2379c0d240f40cc15453fad2df1a4ae34c8.1740713401.git-series.apopple@nvidia.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Tested-by: Alexander Gordeev <agordeev@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Tested-by: Alison Schofield <alison.schofield@intel.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Alistair Popple <apopple@nvidia.com> Cc: Asahi Lina <lina@asahilina.net> Cc: Balbir Singh <balbirs@nvidia.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chunyan Zhang <zhang.lyra@gmail.com> Cc: "Darrick J. Wong" <djwong@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: John Hubbard <jhubbard@nvidia.com> Cc: linmiaohe <linmiaohe@huawei.com> Cc: Logan Gunthorpe <logang@deltatee.com> Cc: Michael "Camp Drill Sergeant" Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Peter Xu <peterx@redhat.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
83 lines
2.1 KiB
Plaintext
83 lines
2.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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comment "S/390 block device drivers"
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depends on S390 && BLOCK
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config DCSSBLK
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def_tristate m
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prompt "DCSSBLK support"
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depends on S390 && BLOCK
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help
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Support for dcss block device
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config DCSSBLK_DAX
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def_bool y
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depends on DCSSBLK
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# requires S390 ZONE_DEVICE support
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depends on BROKEN
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select DAX
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prompt "DCSSBLK DAX support"
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help
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Enable DAX operation for the dcss block device
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config DASD
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def_tristate y
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prompt "Support for DASD devices"
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depends on CCW && BLOCK
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help
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Enable this option if you want to access DASDs directly utilizing
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S/390s channel subsystem commands. This is necessary for running
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natively on a single image or an LPAR.
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config DASD_PROFILE
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def_bool y
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prompt "Profiling support for dasd devices"
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depends on DASD
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help
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Enable this option if you want to see profiling information
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in /proc/dasd/statistics.
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config DASD_ECKD
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def_tristate y
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prompt "Support for ECKD Disks"
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depends on DASD
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help
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ECKD devices are the most commonly used devices. You should enable
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this option unless you are very sure to have no ECKD device.
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config DASD_FBA
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def_tristate y
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prompt "Support for FBA Disks"
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depends on DASD
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help
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Select this option to be able to access FBA devices. It is safe to
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say "Y".
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config DASD_DIAG
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def_tristate y
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prompt "Support for DIAG access to Disks"
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depends on DASD
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help
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Select this option if you want to use Diagnose250 command to access
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Disks under VM. If you are not running under VM or unsure what it is,
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say "N".
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config DASD_EER
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def_bool y
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prompt "Extended error reporting (EER)"
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depends on DASD
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help
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This driver provides a character device interface to the
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DASD extended error reporting. This is only needed if you want to
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use applications written for the EER facility.
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config SCM_BLOCK
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def_tristate m
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prompt "Support for Storage Class Memory"
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depends on S390 && BLOCK && EADM_SCH && SCM_BUS
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help
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Block device driver for Storage Class Memory (SCM). This driver
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provides a block device interface for each available SCM increment.
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To compile this driver as a module, choose M here: the
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module will be called scm_block.
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