This patch introduces a sysfs group entry for the UFS attributes. The
group adds "attributes" folder under the UFS driver sysfs entry
(/sys/bus/platform/drivers/ufshcd/*). The attributes are shown
as hexadecimal numbers. The full information about the attributes could
be found at UFS specifications 2.1.
Change-Id: I0786c10250c6003331b8fabdf3549d103819a0f3
Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Git-commit: ec92b59cc03c3d5757449c1c9344524e088df2bd
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[vvegivad@codeaurora.org: dropped changes already present in driver]
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
This patch introduces a sysfs group entry for the UFS flags. The group adds
"flags" folder under the UFS driver sysfs entry
(/sys/bus/platform/drivers/ufshcd/*). The flags are shown as boolean value
("true" or "false"). The full information about the UFS flags could be
found at UFS specifications 2.1.
Change-Id: I3dc14be3790f02c4c9937b282b2a7e68ac193d32
Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Git-commit: d10b2a8ea8fd0d6c8a667dc1950c8c061bfbbcdd
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
Down Port the UFS Write Booster functionality from 4.19 to 4.14.
sysfs is not available in 4.14 for UFS and hence not ported sysfs.
This feature ported from 4.19 kernel
------------------------------------
2608b87 : add write booster feature support
0197436 : configure write booster type
d80d665 : enable write booster only if provisioned
d3c3e45 : Remove comment to be compliant
20ecc8a : Fix per-LU WB buffer size setting error.
Change-Id: Ie3705ca53fcbf848014ecbfee37a02126241890f
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Ziqi Chen <ziqichen@codeaurora.org>
Signed-off-by: Srinivas Ganji <sringanj@codeaurora.org>
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
This patch introduces a sysfs group entry for the UFS health
descriptor parameters. The group adds "health_descriptor" folder
under the UFS driver sysfs entry
(/sys/bus/platform/drivers/ufshcd/*). The parameters are shown
as hexadecimal numbers. The full information about the parameters
could be found at UFS specifications 2.1.
Change-Id: I469c8cf579b2a660c6bfd2a1bd30d4a7f357c588
Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Git-commit: c648c2d27f168ae4faeb43f8c3074226aae3862c
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Anjana <ahari@codeaurora.org>
This change updates the wait time before turning off the reference clock.
The wait time of UFS version 3.0 and onward devices can be read out from
their device attributes. Otherwise, fix the wait time to 100 micro seconds.
Change-Id: Ie5085e62ef3efa2bfaa3f632593e4ade52ffd645
Signed-off-by: Can Guo <cang@codeaurora.org>
* remotes/msm-4.9/tmp-39dae59:
Linux 4.14-rc8
x86/module: Detect and skip invalid relocations
objtool: Prevent GCC from merging annotate_unreachable(), take 2
Revert "x86/mm: Stop calling leave_mm() in idle code"
Documentation: Add Frank Rowand to list of enforcement statement endorsers
doc: add Willy Tarreau to the list of enforcement statement endorsers
tools/headers: Synchronize kernel ABI headers
objtool: Resync objtool's instruction decoder source code copy with the kernel's latest version
Input: sparse-keymap - send sync event for KE_SW/KE_VSW
Input: ar1021_i2c - set INPUT_PROP_DIRECT
arch/tile: Implement ->set_state_oneshot_stopped()
Update MIPS email addresses
x86: CPU: Fix up "cpu MHz" in /proc/cpuinfo
mm, swap: fix race between swap count continuation operations
mm/huge_memory.c: deposit page table when copying a PMD migration entry
initramfs: fix initramfs rebuilds w/ compression after disabling
fs/hugetlbfs/inode.c: fix hwpoison reserve accounting
ocfs2: fstrim: Fix start offset of first cluster group during fstrim
mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry
userfaultfd: hugetlbfs: prevent UFFDIO_COPY to fill beyond the end of i_size
Documentation: Add Tim Bird to list of enforcement statement endorsers
net: systemport: Correct IPG length settings
tcp: do not mangle skb->cb[] in tcp_make_synack()
fib: fib_dump_info can no longer use __in_dev_get_rtnl
stmmac: use of_property_read_u32 instead of read_u8
net_sched: hold netns refcnt for each action
net_sched: acquire RTNL in tc_action_net_exit()
powerpc/perf: Fix core-imc hotplug callback failure during imc initialization
Kbuild: don't pass "-C" to preprocessor when processing linker scripts
Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz""
arm64: ensure __dump_instr() checks addr_limit
KVM: x86: Update APICv on APIC reset
KVM: VMX: Do not fully reset PI descriptor on vCPU reset
kvm: Return -ENODEV from update_persistent_clock
futex: futex_wake_op, do not fail on invalid op
MIPS: Update email address for Marcin Nowakowski
License cleanup: add SPDX license identifier to uapi header files with a license
License cleanup: add SPDX license identifier to uapi header files with no license
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
KEYS: fix out-of-bounds read during ASN.1 parsing
KEYS: trusted: fix writing past end of buffer in trusted_read()
KEYS: return full count in keyring_read() if buffer is too small
net: vrf: correct FRA_L3MDEV encode type
tcp_nv: fix division by zero in tcpnv_acked()
drm/amdgpu: allow harvesting check for Polaris VCE
drm/amdgpu: return -ENOENT from uvd 6.0 early init for harvesting
ARM: add debug ".edata_real" symbol
MIPS: smp-cmp: Fix vpe_id build error
MAINTAINERS: Update Pistachio platform maintainers
MIPS: smp-cmp: Use right include for task_struct
signal: Fix name of SIGEMT in #if defined() check
MIPS: Update Goldfish RTC driver maintainer email address
MIPS: Update RINT emulation maintainer email address
MIPS: CPS: Fix use of current_cpu_data in preemptible code
x86/mcelog: Get rid of RCU remnants
watchdog/hardlockup/perf: Use atomics to track in-use cpu counter
watchdog/harclockup/perf: Revert a33d44843d ("watchdog/hardlockup/perf: Simplify deferred event destroy")
ARM: 8716/1: pass endianness info to sparse
drm/i915: Check incoming alignment for unfenced buffers (on i915gm)
x86/mm: fix use-after-free of vma during userfaultfd fault
ide:ide-cd: fix kernel panic resulting from missing scsi_req_init
mmc: dw_mmc: Fix the DTO timeout calculation
tcp: fix tcp_mtu_probe() vs highest_sack
ipv6: addrconf: increment ifp refcount before ipv6_del_addr()
tun/tap: sanitize TUNSETSNDBUF input
mlxsw: i2c: Fix buffer increment counter for write transaction
netfilter: nf_reject_ipv4: Fix use-after-free in send_reset
futex: Fix more put_pi_state() vs. exit_pi_state_list() races
powerpc/kprobes: Dereference function pointers only if the address does not belong to kernel text
Revert "powerpc64/elfv1: Only dereference function descriptor for non-text symbols"
mlxsw: reg: Add high and low temperature thresholds
MAINTAINERS: Remove Yotam from mlxfw
MAINTAINERS: Update Yotam's E-mail
net: hns: set correct return value
net: lapbether: fix double free
bpf: remove SK_REDIRECT from UAPI
net: phy: marvell: Only configure RGMII delays when using RGMII
MIPS: SMP: Fix deadlock & online race
MIPS: bpf: Fix a typo in build_one_insn()
MIPS: microMIPS: Fix incorrect mask in insn_table_MM
MIPS: Fix CM region target definitions
MIPS: generic: Fix compilation error from include asm/mips-cpc.h
MIPS: Fix exception entry when CONFIG_EVA enabled
irqchip/irq-mvebu-gicp: Add missing spin_lock init
drm/nouveau/kms/nv50: use the correct state for base channel notifier setup
MIPS: generic: Fix NI 169445 its build
Update MIPS email addresses
tile: pass machine size to sparse
selftests: lib.mk: print individual test results to console by default
RDMA/nldev: Enforce device index check for port callback
Revert "PM / QoS: Fix device resume latency PM QoS"
Revert "PM / QoS: Fix default runtime_pm device resume latency"
scsi: qla2xxx: Fix oops in qla2x00_probe_one error path
xfrm: Fix GSO for IPsec with GRE tunnel.
ALSA: seq: Fix nested rwsem annotation for lockdep splat
ALSA: timer: Add missing mutex lock for compat ioctls
tc-testing: fix arg to ip command: -s -> -n
net_sched: remove tcf_block_put_deferred()
l2tp: hold tunnel in pppol2tp_connect()
drm/i915: Hold rcu_read_lock when iterating over the radixtree (vma idr)
drm/i915: Hold rcu_read_lock when iterating over the radixtree (objects)
drm/i915/edp: read edp display control registers unconditionally
drm/i915: Do not rely on wm preservation for ILK watermarks
drm/i915: Cancel the modeset retry work during modeset cleanup
Mark 'ioremap_page_range()' as possibly sleeping
nvme: Fix setting logical block format when revalidating
mmc: dw_mmc: Add locking to the CTO timer
mmc: dw_mmc: Fix the CTO timeout calculation
mmc: dw_mmc: cancel the CTO timer after a voltage switch
perf/cgroup: Fix perf cgroup hierarchy support
PM / QoS: Fix default runtime_pm device resume latency
Revert "ath10k: fix napi_poll budget overflow"
ath10k: rebuild crypto header in rx data frames
cifs: check MaxPathNameComponentLength != 0 before using it
KVM: arm/arm64: vgic-its: Check GITS_BASER Valid bit before saving tables
KVM: arm/arm64: vgic-its: Check CBASER/BASER validity before enabling the ITS
KVM: arm/arm64: vgic-its: Fix vgic_its_restore_collection_table returned value
KVM: arm/arm64: vgic-its: Fix return value for device table restore
efi/libstub: arm: omit sorting of the UEFI memory map
perf tools: Unwind properly location after REJECT
virtio_blk: Fix an SG_IO regression
wcn36xx: Remove unnecessary rcu_read_unlock in wcn36xx_bss_info_changed
ARM: dts: mvebu: pl310-cache disable double-linefill
xfrm: Clear sk_dst_cache when applying per-socket policy.
perf symbols: Fix memory corruption because of zero length symbols
powerpc/64s/radix: Fix preempt imbalance in TLB flush
netfilter: nft_set_hash: disable fast_ops for 2-len keys
powerpc: Fix check for copy/paste instructions in alignment handler
powerpc/perf: Fix IMC allocation routine
xfrm: Fix xfrm_dst_cache memleak
ARM: 8715/1: add a private asm/unaligned.h
clk: uniphier: fix clock data for PXs3
Documentation: Add my name to kernel enforcement statement
nvme-rdma: fix possible hang when issuing commands during ctrl removal
arm/arm64: kvm: Disable branch profiling in HYP code
arm/arm64: kvm: Move initialization completion message
arm/arm64: KVM: set right LR register value for 32 bit guest when inject abort
Documentation: kernel-enforcement-statement.rst: proper sort names
ASoC: rt5616: fix 0x91 default value
Documentation: Add Arm Ltd to kernel-enforcement-statement.rst
arm64: dts: uniphier: add STDMAC clock to EHCI nodes
ARM: dts: uniphier: add STDMAC clock to EHCI nodes
mmc: renesas_sdhi: fix kernel panic in _internal_dmac.c
mmc: tmio: fix swiotlb buffer is full
Documentation: kernel-enforcement-statement.rst: Remove Red Hat markings
Documentation: Add myself to the enforcement statement list
Documentation: Sign kernel enforcement statement
Add ack for Trond Myklebust to the enforcement statement
Documentation: update kernel enforcement support list
Documentation: add my name to supporters
ASoC: rt5659: connect LOUT Amp with Charge Pump
ASoC: rt5659: register power bit of LOUT Amp
KVM: arm64: its: Fix missing dynamic allocation check in scan_its_table
crypto: x86/chacha20 - satisfy stack validation 2.0
ASoC: rt5663: Change the dev getting function in rt5663_irq
ASoC: rt5514: Revert Hotword Model control
ASoC: topology: Fix a potential memory leak in 'soc_tplg_dapm_widget_denum_create()'
ASoC: topology: Fix a potential NULL pointer dereference in 'soc_tplg_dapm_widget_denum_create()'
ASoC: rt5514-spi: check irq status to schedule data copy
ASoC: adau17x1: Workaround for noise bug in ADC
Conflicts:
drivers/gpu/drm/msm/Makefile
drivers/soc/qcom/Makefile
drivers/staging/android/ion/Makefile
include/linux/coresight-stm.h
include/trace/events/kmem.h
Change-Id: I01f1779762b652b9213924caa3d54f29cf03d285
Signed-off-by: Runmin Wang <runminw@codeaurora.org>
Many user space API headers have licensing information, which is either
incomplete, badly formatted or just a shorthand for referring to the
license under which the file is supposed to be. This makes it hard for
compliance tools to determine the correct license.
Update these files with an SPDX license identifier. The identifier was
chosen based on the license information in the file.
GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
identifier with the added 'WITH Linux-syscall-note' exception, which is
the officially assigned exception identifier for the kernel syscall
exception:
NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely considered normal use
of the kernel, and does *not* fall under the heading of "derived work".
This exception makes it possible to include GPL headers into non GPL
code, without confusing license compliance tools.
Headers which have either explicit dual licensing or are just licensed
under a non GPL license are updated with the corresponding SPDX
identifier and the GPLv2 with syscall exception identifier. The format
is:
((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
SPDX license identifiers are a legally binding shorthand, which can be
used instead of the full boiler plate text. The update does not remove
existing license information as this has to be done on a case by case
basis and the copyright holders might have to be consulted. This will
happen in a separate step.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne. See the previous patch in this series for the
methodology of how this patch was researched.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add #include dependencies to pick up definitions of __u32 and HZ.
Change-Id: I1154db5f1b4203d50c4e0c8a24b10027238ff220
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
[cang@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>
The ioctl information should be in header files that expose it
to userspace.
Change-Id: Iabf1e53a1357c2ce22ecdc8dc0270377759effc8
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
[venkatg@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
The scsi ioctl related files are meant to be used from
userspace and hence should be in the appropriate include/uapi
directory.
Change-Id: Id6b14f353284a9ddac0d58b6b90e17561e2645aa
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
[cang@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>
"bBootLunEn" attribute value decides the active Boot LUN but there could
be a case where userspace may want to change it during image update.
This change allows writing to this parameter.
Change-Id: I6e8d630606d8caf6197ef662003ec1ee646afe81
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
This patch adds a new debugfs capability to collect query statistics.
It counts how many times each IDN (index) was sent to device for each
query opcode.
A usage example:
1. to clean current query statistics:
echo 1 > /d/ufshcd0/stats/query_stats
2. to dump the current query statistics:
cat /d/ufshcd0/stats/query_stats
This capability is always on, and can not be turned off.
Change-Id: I46ec405aae480c0dc161dca015b407bde6335cf7
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>
This patch exposes the ioctl interface for UFS
driver via SCSI device ioctl interface. As of
now UFS driver would provide the ioctl for query
interface to connected UFS device.
Change-Id: Ib8301a69550408bfcb5fc85bb9c0498450c8cc31
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
[subhashj@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts
and correct QUERY_DESC_IDN_CONFIGURAION to
QUERY_DESC_IDN_CONFIGURATION]
Signed-off-by: Can Guo <cang@codeaurora.org>
Adopt the SISLite AFU debug capability to allow future CXL Flash
adapters the ability to better debug AFU issues. Update the SISLite
header with the changes necessary to support AFU debug operations
and create a host ioctl interface for user debug software. Also
update the cxlflash documentation to describe this new host ioctl.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Adopt the SISLite AFU LUN provisioning capability to allow future CXL
Flash adapters the ability to better manage storage. Update the SISLite
header with the changes necessary to support LUN provision operations
and create a host ioctl interface for user LUN management software. Also
update the cxlflash documentation to describe this new host ioctl.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
As staging for supporting various host management functions, add a host
ioctl infrastructure to filter ioctl commands and perform operations that
are common for all host ioctls. Also update the cxlflash documentation to
create a new section for documenting host ioctls.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Regularly, when a new header is created in include/uapi/, the developer
forgets to add it in the corresponding Kbuild file. This error is usually
detected after the release is out.
In fact, all headers under uapi directories should be exported, thus it's
useless to have an exhaustive list.
After this patch, the following files, which were not exported, are now
exported (with make headers_install_all):
asm-arc/kvm_para.h
asm-arc/ucontext.h
asm-blackfin/shmparam.h
asm-blackfin/ucontext.h
asm-c6x/shmparam.h
asm-c6x/ucontext.h
asm-cris/kvm_para.h
asm-h8300/shmparam.h
asm-h8300/ucontext.h
asm-hexagon/shmparam.h
asm-m32r/kvm_para.h
asm-m68k/kvm_para.h
asm-m68k/shmparam.h
asm-metag/kvm_para.h
asm-metag/shmparam.h
asm-metag/ucontext.h
asm-mips/hwcap.h
asm-mips/reg.h
asm-mips/ucontext.h
asm-nios2/kvm_para.h
asm-nios2/ucontext.h
asm-openrisc/shmparam.h
asm-parisc/kvm_para.h
asm-powerpc/perf_regs.h
asm-sh/kvm_para.h
asm-sh/ucontext.h
asm-tile/shmparam.h
asm-unicore32/shmparam.h
asm-unicore32/ucontext.h
asm-x86/hwcap2.h
asm-xtensa/kvm_para.h
drm/armada_drm.h
drm/etnaviv_drm.h
drm/vgem_drm.h
linux/aspeed-lpc-ctrl.h
linux/auto_dev-ioctl.h
linux/bcache.h
linux/btrfs_tree.h
linux/can/vxcan.h
linux/cifs/cifs_mount.h
linux/coresight-stm.h
linux/cryptouser.h
linux/fsmap.h
linux/genwqe/genwqe_card.h
linux/hash_info.h
linux/kcm.h
linux/kcov.h
linux/kfd_ioctl.h
linux/lightnvm.h
linux/module.h
linux/nbd-netlink.h
linux/nilfs2_api.h
linux/nilfs2_ondisk.h
linux/nsfs.h
linux/pr.h
linux/qrtr.h
linux/rpmsg.h
linux/sched/types.h
linux/sed-opal.h
linux/smc.h
linux/smc_diag.h
linux/stm.h
linux/switchtec_ioctl.h
linux/vfio_ccw.h
linux/wil6210_uapi.h
rdma/bnxt_re-abi.h
Note that I have removed from this list the files which are generated in every
exported directories (like .install or .install.cmd).
Thanks to Julien Floret <julien.floret@6wind.com> for the tip to get all
subdirs with a pure makefile command.
For the record, note that exported files for asm directories are a mix of
files listed by:
- include/uapi/asm-generic/Kbuild.asm;
- arch/<arch>/include/uapi/asm/Kbuild;
- arch/<arch>/include/asm/Kbuild.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Mark Salter <msalter@redhat.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
The SISLite specification outlines a new queuing model to improve
over the MMIO-based IOARRIN model that exists today. This new model
uses a submission queue that exists in host memory and is shared with
the device. Each entry in the queue is an IOARCB that describes a
transfer request. When requests are submitted, IOARCBs ('current'
position tracked in host software) are populated and the submission
queue tail pointer is then updated via MMIO to make the device aware
of the requests.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Caching the adapter file descriptor and performing a close on behalf of
an application is a poor design. This is due to the fact that once a
file descriptor in installed, it is free to be altered without the
knowledge of the cxlflash driver. This can lead to inconsistencies
between the application and kernel. Furthermore, the nature of the
former design is more exploitable and thus should be abandoned.
To support applications performing a close on the adapter file that is
associated with a context, a new flag is introduced to the user API to
indicate to applications that they are responsible for the close
following the cleanup (detach) of a context. The documentation is also
updated to reflect this change in behavior.
Inspired-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Acked-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Applications which use virtual LUN's that are backed by a physical LUN
over both adapter ports may experience an I/O failure in the event of a
link loss (e.g. cable pull).
Virtual LUNs may be accessed through one or both ports of the adapter.
This access is encoded in the translation entries that comprise the
virtual LUN and used by the AFU for load-balancing I/O and handling
failover scenarios. In a link loss scenario, even though the AFU is able
to maintain connectivity to the LUN, it is up to the application to
retry the failed I/O. When applications are unaware of the virtual LUN's
underlying topology, they are unable to make a sound decision of when to
retry an I/O and therefore are forced to make their reaction to a failed
I/O absolute. The result is either a failure to retry I/O or increased
latency for scenarios where a retry is pointless.
To remedy this scenario, provide feedback back to the application on
virtual LUN creation as to which ports the LUN may be accessed. LUN's
spanning both ports are candidates for a retry in a presence of an I/O
failure.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Acked-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Add support for physical LUN segmentation (virtual LUNs) to device
driver supporting the IBM CXL Flash adapter. This patch allows user
space applications to virtually segment a physical LUN into N virtual
LUNs, taking advantage of the translation features provided by this
adapter.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Add superpipe supporting infrastructure to device driver for the IBM CXL
Flash adapter. This patch allows userspace applications to take advantage
of the accelerated I/O features that this adapter provides and bypass the
traditional filesystem stack.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
