There is only one caller for ops_free(), so inline it.
Separate net_drop_ns() and net_free(), so the net_free()
can be called directly.
Add free_exit_list() helper function for free net_exit_list.
====================
v2:
- v1 does not apply, rebase it.
====================
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add support for tag_sja1105 running on non-sja1105 DSA ports, by making
sure that every time we dereference dp->priv, we check the switch's
dsa_switch_ops (otherwise we access a struct sja1105_port structure that
is in fact something else).
This adds an unconditional build-time dependency between sja1105 being
built as module => tag_sja1105 must also be built as module. This was
there only for PTP before.
Some sane defaults must also take place when not running on sja1105
hardware. These are:
- sja1105_xmit_tpid: the sja1105 driver uses different VLAN protocols
depending on VLAN awareness and switch revision (when an encapsulated
VLAN must be sent). Default to 0x8100.
- sja1105_rcv_meta_state_machine: this aggregates PTP frames with their
metadata timestamp frames. When running on non-sja1105 hardware, don't
do that and accept all frames unmodified.
- sja1105_defer_xmit: calls sja1105_port_deferred_xmit in sja1105_main.c
which writes a management route over SPI. When not running on sja1105
hardware, bypass the SPI write and send the frame as-is.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
It seems that of_find_compatible_node has a weird calling convention in
which it calls of_node_put() on the "from" node argument, instead of
leaving that up to the caller. This comes from the fact that
of_find_compatible_node with a non-NULL "from" argument it only supposed
to be used as the iterator function of for_each_compatible_node(). OF
iterator functions call of_node_get on the next OF node and of_node_put()
on the previous one.
When of_find_compatible_node calls of_node_put, it actually never
expects the refcount to drop to zero, because the call is done under the
atomic devtree_lock context, and when the refcount drops to zero it
triggers a kobject and a sysfs file deletion, which assume blocking
context.
So any driver call to of_find_compatible_node is probably buggy because
an unexpected of_node_put() takes place.
What should be done is to use the of_get_compatible_child() function.
Fixes: 5a8f09748e ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
Link: https://lore.kernel.org/netdev/20210814010139.kzryimmp4rizlznt@skbuf/
Suggested-by: Frank Rowand <frowand.list@gmail.com>
Suggested-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Bongsu Jeon says:
====================
Update the virtual NCI device driver and add the NCI testcase
This series updates the virtual NCI device driver and NCI selftest code
and add the NCI test case in selftests.
1/8 to use wait queue in virtual device driver.
2/8 to remove the polling code in selftests.
3/8 to fix a typo.
4/8 to fix the next nlattr offset calculation.
5/8 to fix the wrong condition in if statement.
6/8 to add a flag parameter to the Netlink send function.
7/8 to extract the start/stop discovery function.
8/8 to add the NCI testcase in selftests.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Add the NCI testcase reading T4T Tag that has NFC TEST in plain text.
the virtual device application acts as T4T Tag in this testcase.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
To reuse the start/stop discovery code in other testcase, extract the code.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
To reuse the send_cmd_mt_nla for NLM_F_REQUEST and NLM_F_DUMP flag,
add the flags parameter to the function.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
memcpy should be executed only in case nla_len's value is greater than 0.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
nlattr could have a padding for 4 bytes alignment. So next nla's offset
should be calculated with a padding.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Because the virtual NCI device uses Wait Queue, the virtual device
application doesn't need to poll the NCI frame.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In previous version, the user level virtual device application that used
this driver should have the polling scheme to read a NCI frame.
To remove this polling scheme, use Wait Queue.
Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When adding support for using the skb->hash value as the flow hash in CAKE,
I accidentally introduced a logic error that broke the host-only isolation
modes of CAKE (srchost and dsthost keywords). Specifically, the flow_hash
variable should stay initialised to 0 in cake_hash() in pure host-based
hashing mode. Add a check for this before using the skb->hash value as
flow_hash.
Fixes: b0c19ed608 ("sch_cake: Take advantage of skb->hash where appropriate")
Reported-by: Pete Heist <pete@heistp.net>
Tested-by: Pete Heist <pete@heistp.net>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add seq_puts() statement for dev_mcast, make it more readable.
As also, keep vertical alignment for {dev, ptype, dev_mcast} that
under /proc/net.
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Make all dependent RxRPC kconfig entries be dependent on AF_RXRPC
so that they are presented (indented) after AF_RXRPC instead
of being presented at the same level on indentation.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: linux-afs@lists.infradead.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
When protected mode is enabled, the host is unable to access most parts
of the EL2 hypervisor image, including 'hyp_physvirt_offset' and the
contents of the hypervisor's '.rodata.str' section. Unfortunately,
nvhe_hyp_panic_handler() tries to read from both of these locations when
handling a BUG() triggered at EL2; the former for converting the ELR to
a physical address and the latter for displaying the name of the source
file where the BUG() occurred.
Hack the EL2 panic asm to pass both physical and virtual ELR values to
the host and utilise the newly introduced CONFIG_NVHE_EL2_DEBUG so that
we disable stage-2 protection for the host before returning to the EL1
panic handler. If the debug option is not enabled, display the address
instead of the source file:line information.
Cc: Andrew Scull <ascull@google.com>
Cc: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210813130336.8139-1-will@kernel.org
Mat Martineau says:
====================
mptcp: Add full mesh path manager option
The path manager in MPTCP controls the creation of additional subflows
after the initial connection is created. As each peer advertises
available endpoints with the ADD_ADDR MPTCP option, the recipient of
those advertisements must decide which subflows to create from the known
local and remote interfaces that are available for use by MPTCP.
The existing in-kernel path manager will create one additional subflow
when an ADD_ADDR is received, or a local address is newly configured for
MPTCP use. The maximum number of subflows has a configurable limit.
This patch set adds a MPTCP_PM_ADDR_FLAG_FULLMESH flag to the MPTCP
netlink API that enables subflows to be created more aggressively. When
an ADD_ADDR is received from a peer, new subflows are created between
that address/port and all local addresses configured for MPTCP.
Similarly, when a new local address is newly configured for use by
MPTCP, new subflows are created between that local address and all known
remote addresses for that MPTCP connection. The configurable limit on
the number of subflows still applies. If the new flag is not used the
path manager behavior is unchanged.
Patch 1 adds a helper function and refactors another function to prepare
for the rest of the patch series.
Patches 2 and 3 add two mesh connection capabilities: initiating
subflows based on added local addresses, or reacting to incoming
advertisements.
Patches 4-6 add full mesh cases to the self tests.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
The removing addresses testcases can only deal with the continuous ids.
This patch added the uncontinuous removing ids support.
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch added the testcases for the fullmesh address flag of the path
manager.
Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch dealt with the MPTCP_PM_ADDR_FLAG_FULLMESH flag in add_addr()
and print_addr(), to set and print out the fullmesh flag.
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In mptcp_pm_nl_add_addr_received(), fill a temporary allocate array of
all local address corresponding to the fullmesh endpoint. If such array
is empty, keep the current behavior.
Elsewhere loop on such array and create a subflow for each local address
towards the given remote address
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch added and managed a new per endpoint flag, named
MPTCP_PM_ADDR_FLAG_FULLMESH.
In mptcp_pm_create_subflow_or_signal_addr(), if such flag is set, instead
of:
remote_address((struct sock_common *)sk, &remote);
fill a temporary allocated array of all known remote address. After
releaseing the pm lock loop on such array and create a subflow for each
remote address from the given local.
Note that the we could still use an array even for non 'fullmesh'
endpoint: with a single entry corresponding to the primary MPC subflow
remote address.
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch added a new helper mptcp_pm_get_flags_and_ifindex_by_id(),
and used it in __mptcp_subflow_connect() to get the flags and ifindex
values.
Then the two arguments flags and ifindex of __mptcp_subflow_connect()
can be dropped.
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
No longer required now that userspace can't touch anything that might
need it, and should fix DRM MM operations racing with each other, and
the random hangs/crashes that come with that.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Long ago, there had been plans for making use of a bunch of these APIs
from userspace and there's various checks in place to stop misbehaving.
Countless other projects have occurred in the meantime, and the pieces
didn't finish falling into place for that to happen.
They will (hopefully) in the not-too-distant future, but it won't look
quite as insane. The super checks are causing problems right now, and
are going to be removed.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
I honestly don't even know why... These have never been used.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Should fix some initial modeset failures on (at least) Ampere boards.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
When booted with multiple displays attached, the EFI GOP driver on (at
least) Ampere, can leave DP links powered up that aren't being used to
display anything. This confuses our tracking of SOR routing, with the
likely result being a failed modeset and display engine hang.
Fix this by (ab?)using the DisableLT IED script to power-down the link,
restoring HW to a state the driver expects.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
kvm_target_cpu() never returns a negative error code, so check_kvm_target()
would never have 'ret' filled with a negative error code. Hence the percpu
probe via check_kvm_target_cpu() does not make sense as its never going to
find an unsupported CPU, forcing kvm_arch_init() to exit early. Hence lets
just drop this percpu probe (and also check_kvm_target_cpu()) altogether.
While here, this also changes kvm_target_cpu() return type to a u32, making
it explicit that an error code will not be returned from this function.
Cc: Marc Zyngier <maz@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1628744994-16623-5-git-send-email-anshuman.khandual@arm.com
Currently there are macros only for 48 and 52 bits parange value extracted
from the ID_AA64MMFR0.PARANGE field. This change completes the enumeration
and updates the helper id_aa64mmfr0_parange_to_phys_shift(). While here it
also defines ARM64_MIN_PARANGE_BITS as the absolute minimum shift value PA
range which could be supported on a given platform.
Cc: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1628744994-16623-2-git-send-email-anshuman.khandual@arm.com
The struct pci_dev uses reference counting but zPCI assumed erroneously
that the last reference would always be the local reference after
calling pci_stop_and_remove_bus_device(). This is usually the case but
not how reference counting works and thus inherently fragile.
In fact one case where this causes a NULL pointer dereference when on an
SRIOV device the function 0 was hot unplugged before another function of
the same multi-function device. In this case the second function's
pdev->sriov->dev reference keeps the struct pci_dev of function 0 alive
even after the unplug. This bug was previously hidden by the fact that
we were leaking the struct pci_dev which in turn means that it always
outlived the struct zpci_dev. This was fixed in commit 0b13525c20
("s390/pci: fix leak of PCI device structure") exposing the broken
behavior.
Fix this by accounting for the long living reference a struct pci_dev
has to its underlying struct zpci_dev via the zbus->function[] array and
only release that in pcibios_release_device() ensuring that the struct
pci_dev is not left with a dangling reference. This is a minimal fix in
the future it would probably better to use fine grained reference
counting for struct zpci_dev.
Fixes: 05bc1be6db ("s390/pci: create zPCI bus")
Cc: stable@vger.kernel.org
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Fix buf allocation size (it needs to be 2 bytes larger). Found when
__alloc_size() annotations were added to kmalloc() interfaces.
In file included from ./include/linux/string.h:253,
from ./include/linux/bitmap.h:10,
from ./include/linux/cpumask.h:12,
from ./arch/x86/include/asm/paravirt.h:17,
from ./arch/x86/include/asm/irqflags.h:63,
from ./include/linux/irqflags.h:16,
from ./include/linux/rcupdate.h:26,
from ./include/linux/rculist.h:11,
from ./include/linux/pid.h:5,
from ./include/linux/sched.h:14,
from ./include/linux/blkdev.h:5,
from drivers/staging/rts5208/rtsx_scsi.c:12:
In function 'get_ms_information',
inlined from 'ms_sp_cmnd' at drivers/staging/rts5208/rtsx_scsi.c:2877:12,
inlined from 'rtsx_scsi_handler' at drivers/staging/rts5208/rtsx_scsi.c:3247:12:
./include/linux/fortify-string.h:54:29: warning: '__builtin_memcpy' forming offset [106, 107] is out
of the bounds [0, 106] [-Warray-bounds]
54 | #define __underlying_memcpy __builtin_memcpy
| ^
./include/linux/fortify-string.h:417:2: note: in expansion of macro '__underlying_memcpy'
417 | __underlying_##op(p, q, __fortify_size); \
| ^~~~~~~~~~~~~
./include/linux/fortify-string.h:463:26: note: in expansion of macro '__fortify_memcpy_chk'
463 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
| ^~~~~~~~~~~~~~~~~~~~
drivers/staging/rts5208/rtsx_scsi.c:2851:3: note: in expansion of macro 'memcpy'
2851 | memcpy(buf + i, ms_card->raw_sys_info, 96);
| ^~~~~~
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210818044252.1533634-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove all the code related to the management of the NAT25_LOOKUP
method in nat25_db_handle(). The only function that used that method was
the now deleted nat25_handle_frame(). Remove the NAT25_LOOKUP entry from
the NAT25_METHOD enum because it is not anymore used everywhere else in
the code of the driver.
Remove the 'sender' pointer to integer. Remove
__nat25_db_network_lookup_and_replace(). Following the deletion of the
code related to the NAT25_LOOKUP method, they are no more needed.
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20210817185723.15192-1-fmdefrancesco@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The memory block occupied by the SCLP early buffer that is allocated
by the decompressor and then handed over to the decompressed kernel,
must be reserved to prevent it from being reused for other purposes.
This is necessary because the SCLP early buffer is still in use
during kernel initialization.
Fixes: f1d3c53237 ("s390/boot: move sclp early buffer from fixed address in asm to C")
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Tests showed a mismatch between what the CCA tool reports about
the APKA master key state and what's displayed by the zcrypt dd
in sysfs. After some investigation, we found out that the
documentation which was the source for the zcrypt dd implementation
lacks the listing of 3 fields. So this patch now moves the
evaluation of the APKA master key state to the correct offset.
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
The last user of arch_set_page_states(), arch_set_page_nodat() and
arch_test_page_nodat() was removed in commit 394216275c
("s390: remove broken hibernate / power management support"),
let's remove these functions.
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20210806075430.6103-1-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Neither of the two drivers provides any SLIB parameter data, so get rid
of the dead code.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Move all QIB-related code into qdio_setup_qib(), and slightly re-order
it according to the order of the struct's fields. This makes it easier
to understand what the QIB actually looks like before we send it to HW.
Also get rid of the qebsm_possible() helper - as 31-bit support is long
gone, the comment doesn't make any sense. And while removing some stale
QIB-related comment, also move the clearing of the QDR into its proper
place.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Prefer dev_info() over a raw printk. This also adds the device and
driver names into the output, so that we have:
Before:
qdio: 0.0.17c0 ZFCP on SC 17 using [...]
After:
zfcp 0.0.17c0: qdio: ZFCP on SC 17 using [...]
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Push the sync check from qdio_inspect_queue() down into the two
get_*_buffer_frontier() code paths, where we actually need the sync to
look at the current queue state. This lets us avoid the check when we
know that there is no work on the queue (ie. when q->nr_buf_used is 0).
While at it introduce the qdio_sync_*_queue() helpers, so that we can
avoid the branch on q->is_input_q when we already know the queue type.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Don't bother with translating the SIGA-related capability bits into
our own internal format, just cache the full qdioac1 field instead.
Also adjust the helper macros so that they take a qdio_irq argument
and can be used everywhere, instead of taking a qdio_q and then
internally dereferencing the parent pointer.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
The queue processing is fully decoupled from any preceding interrupt,
so we're no longer making any use of the sync-after-IRQ HW capabilities.
And as SIGA-sync is a legacy feature, there's also not much point in
re-designing the driver & qdio-layer code just so that we can
potentially avoid a few syncs. So just remove all the leftover code.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Clean up yet another path where HW wants an absolute address, and we've
been implicitly relying on V=R.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Introduce dev_busid, which exports the device-id associated with the
io-subchannel (and message-subchannel). The dev_busid indicates that of
the device which may be physically installed on the corrosponding
subchannel. The dev_busid value "none" indicates that the subchannel
is not valid, there is no I/O device currently associated with the
subchannel.
The dev_busid information would be helpful to write device-specific
udev-rules associated with the subchannel. The dev_busid interface would
be available even when the sch is not bound to any driver or if there is
no operational device connected on it. Hence this attribute can be used to
write udev-rules which are specific to the device associated with the
subchannel.
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This patch introduces a new rescan sys-interface for channel-subsystem.
The rescan interface allows the user to invoke an evaluation of all
subchannels defined in the I/O configuration.
The new rescan interface can be found at /sys/devices/css0/rescan
and can be triggered by,
echo > /sys/devices/css0/rescan
Writing to this interface triggers subchannel evaluation. The write
request completes only after scan-related work has completed
This user-invoked subchannel evaluation allows manual recovery in error
situations such as:
- restart of device discovery after resolution of temporary device
error
- inconsistent OS view of subchannel state due to missing state-change
interrupts (CRWs)
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
