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Some kernels now enable CONFIG_IO_STRICT_DEVMEM which prevents multiple
handles to PCI resource0. In order to continue to support expansion ROM
updates while the driver is loaded, the driver must now provide an
interface to control the expansion ROM write protection.
This patch adds an exprom_wp debugfs interface that allows the hfi1_eprom
user tool to disable the expansion ROM write protection by opening the
file and writing a '1'. The write protection is released when writing a
'0' or automatically re-enabled when the file handle is closed. The
current implementation will only allow one handle to be opened at a time
across all hfi1 devices.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Josh Collier <josh.d.collier@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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Also remove hfi1_devs_list.
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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When calling debugfs functions, there is no need to ever check the
return value. The function can work or not, but the code logic should
never do something different based on this.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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The macro was just making things harder to follow, and audit, so remove
it and call debugfs_create_file() directly. Also, the macro did not
need to warn about the call failing as no one should ever care about any
debugfs functions failing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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This patch dumps the pio info for non-user send contexts to assist
debugging in the field.
Reviewed-by: Mike Marciniczyn <mike.marciniszyn@intel.com>
Reviewed-by: Mike Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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The packet fault injection code present in the HFI1 driver had some
issues which not only fragment the code but also created user
confusion. Furthermore, it suffered from the following issues:
1. The fault_packet method only worked for received packets. This
meant that the only fault injection mode available for sent
packets is fault_opcode, which did not allow for random packet
drops on all egressing packets.
2. The mask available for the fault_opcode mode did not really work
due to the fact that the opcode values are not bits in a bitmask but
rather sequential integer values. Creating a opcode/mask pair that
would successfully capture a set of packets was nearly impossible.
3. The code was fragmented and used too many debugfs entries to
operate and control. This was confusing to users.
4. It did not allow filtering fault injection on a per direction basis -
egress vs. ingress.
In order to improve or fix the above issues, the following changes have
been made:
1. The fault injection methods have been combined into a single fault
injection facility. As such, the fault injection has been plugged
into both the send and receive code paths. Regardless of method used
the fault injection will operate on both egress and ingress packets.
2. The type of fault injection - by packet or by opcode - is now controlled
by changing the boolean value of the file "opcode_mode". When the value
is set to True, fault injection is done by opcode. Otherwise, by
packet.
2. The masking ability has been removed in favor of a bitmap that holds
opcodes of interest (one bit per opcode, a total of 256 bits). This
works in tandem with the "opcode_mode" value. When the value of
"opcode_mode" is False, this bitmap is ignored. When the value is
True, the bitmap lists all opcodes to be considered for fault injection.
By default, the bitmap is empty. When the user wants to filter by opcode,
the user sets the corresponding bit in the bitmap by echo'ing the bit
position into the 'opcodes' file. This gets around the issue that the set
of opcodes does not lend itself to effective masks and allow for extremely
fine-grained filtering by opcode.
4. fault_packet and fault_opcode methods have been combined. Hence, there
is only one debugfs directory controlling the entire operation of the
fault injection machinery. This reduces the number of debugfs entries
and provides a more unified user experience.
5. A new control files - "direction" - is provided to allow the user to
control the direction of packets, which are subject to fault injection.
6. A new control file - "skip_usec" - is added that would allow the user
to specify a "timeout" during which no fault injection will occur.
In addition, the following bug fixes have been applied:
1. The fault injection code has been split into its own header and source
files. This was done to better organize the code and support conditional
compilation without littering the code with #ifdef's.
2. The method by which the TX PIO packets were being marked for drop
conflicted with the way send contexts were being setup. As a result,
the send context was repeatedly being reset.
3. The fault injection only makes sense when the user can control it
through the debugfs entries. However, a kernel configuration can
enable fault injection but keep fault injection debugfs entries
disabled. Therefore, it makes sense that the HFI fault injection
code depends on both.
4. Error suppression did not take into account the method by which PIO
packets were being dropped. Therefore, even with error suppression
turned on, errors would still be displayed to the screen. A larger
enough packet drop percentage would case the kernel to crash because
the driver would be stuck printing errors.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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There are config dependent code paths that expose panics in unload
paths both in this file and in debugfs_remove_recursive() because
CONFIG_FAULT_INJECTION and CONFIG_FAULT_INJECTION_DEBUG_FS can be
set independently.
Having CONFIG_FAULT_INJECTION set and CONFIG_FAULT_INJECTION_DEBUG_FS
reset causes fault_create_debugfs_attr() to return an error.
The debugfs.c routines tolerate failures, but the module unload panics
dereferencing a NULL in the two exit routines. If that is fixed, the
dir passed to debugfs_remove_recursive comes from a memory location
that was freed and potentially reused causing a segfault or corrupting
memory.
Here is an example of the NULL deref panic:
[66866.286829] BUG: unable to handle kernel NULL pointer dereference at 0000000000000088
[66866.295602] IP: hfi1_dbg_ibdev_exit+0x2a/0x80 [hfi1]
[66866.301138] PGD 858496067 P4D 858496067 PUD 8433a7067 PMD 0
[66866.307452] Oops: 0000 [#1] SMP
[66866.310953] Modules linked in: hfi1(-) rdmavt rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm iw_cm ib_cm ib_core rpcsec_gss_krb5 nfsv4 dns_resolver nfsv3 nfs fscache sb_edac x86_pkg_temp_thermal intel_powerclamp vfat fat coretemp kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel iTCO_wdt iTCO_vendor_support crypto_simd mei_me glue_helper cryptd mxm_wmi ipmi_si pcspkr lpc_ich sg mei ioatdma ipmi_devintf i2c_i801 mfd_core shpchp ipmi_msghandler wmi acpi_power_meter acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables ext4 mbcache jbd2 sd_mod mgag200 drm_kms_helper syscopyarea sysfillrect sysimgblt igb fb_sys_fops ttm ahci ptp crc32c_intel libahci pps_core drm dca libata i2c_algo_bit i2c_core [last unloaded: opa_vnic]
[66866.385551] CPU: 8 PID: 7470 Comm: rmmod Not tainted 4.14.0-mam-tid-rdma #2
[66866.393317] Hardware name: Intel Corporation S2600WT2/S2600WT2, BIOS SE5C610.86B.01.01.0018.C4.072020161249 07/20/2016
[66866.405252] task: ffff88084f28c380 task.stack: ffffc90008454000
[66866.411866] RIP: 0010:hfi1_dbg_ibdev_exit+0x2a/0x80 [hfi1]
[66866.417984] RSP: 0018:ffffc90008457da0 EFLAGS: 00010202
[66866.423812] RAX: 0000000000000000 RBX: ffff880857de0000 RCX: 0000000180040001
[66866.431773] RDX: 0000000180040002 RSI: ffffea0021088200 RDI: 0000000040000000
[66866.439734] RBP: ffffc90008457da8 R08: ffff88084220e000 R09: 0000000180040001
[66866.447696] R10: 000000004220e001 R11: ffff88084220e000 R12: ffff88085a31c000
[66866.455657] R13: ffffffffa07c9820 R14: ffffffffa07c9890 R15: ffff881059d78100
[66866.463618] FS: 00007f6876047740(0000) GS:ffff88085f800000(0000) knlGS:0000000000000000
[66866.472644] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[66866.479053] CR2: 0000000000000088 CR3: 0000000856357006 CR4: 00000000001606e0
[66866.487013] Call Trace:
[66866.489747] remove_one+0x1f/0x220 [hfi1]
[66866.494221] pci_device_remove+0x39/0xc0
[66866.498596] device_release_driver_internal+0x141/0x210
[66866.504424] driver_detach+0x3f/0x80
[66866.508409] bus_remove_driver+0x55/0xd0
[66866.512784] driver_unregister+0x2c/0x50
[66866.517164] pci_unregister_driver+0x2a/0xa0
[66866.521934] hfi1_mod_cleanup+0x10/0xaa2 [hfi1]
[66866.526988] SyS_delete_module+0x171/0x250
[66866.531558] do_syscall_64+0x67/0x1b0
[66866.535644] entry_SYSCALL64_slow_path+0x25/0x25
[66866.540792] RIP: 0033:0x7f6875525c27
[66866.544777] RSP: 002b:00007ffd48528e78 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
[66866.553224] RAX: ffffffffffffffda RBX: 0000000001cc01d0 RCX: 00007f6875525c27
[66866.561185] RDX: 00007f6875596000 RSI: 0000000000000800 RDI: 0000000001cc0238
[66866.569146] RBP: 0000000000000000 R08: 00007f68757e9060 R09: 00007f6875596000
[66866.577120] R10: 00007ffd48528c00 R11: 0000000000000206 R12: 00007ffd48529db4
[66866.585080] R13: 0000000000000000 R14: 0000000001cc01d0 R15: 0000000001cc0010
[66866.593040] Code: 90 0f 1f 44 00 00 48 83 3d a3 8b 03 00 00 55 48 89 e5 53 48 89 fb 74 4e 48 8d bf 18 0c 00 00 e8 9d f2 ff ff 48 8b 83 20 0c 00 00 <48> 8b b8 88 00 00 00 e8 2a 21 b3 e0 48 8b bb 20 0c 00 00 e8 0e
[66866.614127] RIP: hfi1_dbg_ibdev_exit+0x2a/0x80 [hfi1] RSP: ffffc90008457da0
[66866.621885] CR2: 0000000000000088
[66866.625618] ---[ end trace c4817425783fb092 ]---
Fix by insuring that upon failure from fault_create_debugfs_attr() the
parent pointer for the routines is always set to NULL and guards added
in the exit routines to insure that debugfs_remove_recursive() is not
called when when the parent pointer is NULL.
Fixes: 0181ce31b260 ("IB/hfi1: Add receive fault injection feature")
Cc: <stable@vger.kernel.org> # 4.14.x
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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The routine which shows the fault stats checks the counters
to determine whether to show any stats based on the number of
transmitted pkts/bytes for a particular opcode.
Unfortunately, it only checked the receive counters. As a result,
if any packet faults have happened for packets egressing the HFI,
those stats would not be shown.
In order to fix this, the routine is amended to also check the
TX counters. With this change the pkt/byte counts are the sum of
both TX and RX counts for the opcode.
Fixes: 1b311f8931cf ("IB/hfi1: Add tx_opcode_stats like the opcode_stats")
Reviewed-by: Don Hiatt <don.hiatt@intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the set of driver core / debugfs patches for 4.15-rc1.
Not many here, mostly all are debugfs fixes to resolve some
long-reported problems with files going away with references to them
in userspace. There's also some SPDX cleanups for the debugfs code, as
well as a few other minor driver core changes for issues reported by
people.
All of these have been in linux-next for a week or more with no
reported issues"
* tag 'driver-core-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
driver core: Fix device link deferred probe
debugfs: Remove redundant license text
debugfs: add SPDX identifiers to all debugfs files
debugfs: defer debugfs_fsdata allocation to first usage
debugfs: call debugfs_real_fops() only after debugfs_file_get()
debugfs: purge obsolete SRCU based removal protection
IB/hfi1: convert to debugfs_file_get() and -put()
debugfs: convert to debugfs_file_get() and -put()
debugfs: debugfs_real_fops(): drop __must_hold sparse annotation
debugfs: implement per-file removal protection
debugfs: add support for more elaborate ->d_fsdata
driver core: Move device_links_purge() after bus_remove_device()
arch_topology: Fix section miss match warning due to free_raw_capacity()
driver-core: pr_err() strings should end with newlines
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Convert all calls to the now obsolete debugfs_use_file_start() and
debugfs_use_file_finish() to the new debugfs_file_get() and
debugfs_file_put() API.
Fixes: 49d200deaa68 ("debugfs: prevent access to removed files' private data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This patch adds tx_opcode_stats to parallel the
(rx)opcode_stats in the debugfs.
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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hfi1_rcd_get_by_index assumes that the given index is in the correct
range. In most cases this is correct because the index is bounded by
a loop. For these cases, adding a range check to the function is
redundant.
For the use case that is not bounded by the loop range, a _safe wrapper
function is needed to validate the index before accessing the rcd array.
Add a _safe wrapper to _get_by_index to validate the index range.
Update appropriate call sites with the new _safe function.
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Continue moving copy/paste code into rdmavt.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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There is a mixture of mutex and spinlocks to protect receive context
(rcd/uctxt) information. This is not used consistently.
Use the mutex to protect device receive context information only.
Use the spinlock to protect sub context information only.
Protect access to items in the rcd array with a spinlock and
reference count.
Remove spinlock around dd->rcd array cleanup. Since interrupts are
disabled and cleaned up before this point, this lock is not useful.
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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HFI1 HW specific support for VNIC functionality.
Dynamically allocate a set of contexts for VNIC when the first vnic
port is instantiated. Allocate VNIC contexts from user contexts pool
and return them back to the same pool while freeing up. Set aside
enough MSI-X interrupts for VNIC contexts and assign them when the
contexts are allocated. On the receive side, use an RSM rule to
spread TCP/UDP streams among VNIC contexts.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Add ability to fault packets on transmit by opcode.
Dropping by packet can be achieved by setting the mask to 0.
In order to drop non-verbs traffic we set PbcInsertHrc
to NONE (0x2). The packet will still be delivered to
the receiving node but a KHdrHCRCErr (KDETH packet
with a bad HCRC) will be triggered and the packet will
not be delivered to the correct context.
In order to drop regular verbs traffic we set the
PbcTestEbp flag. The packet will still be delivered
to the receiving node but a 'late ebp error' will
be triggered and will be dropped.
A global toggle (/sys/kernel/debug/hfi1/hfi1_X/fault_suppress_err)
has been added to suppress the error messages on the receive
node when a packet was faulted on the sending node.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Add fault injection capability:
- Drop packets unconditionally (fault_by_packet)
- Drop packets based on opcode (fault_by_opcode)
This feature reacts to the global FAULT_INJECTION
config flag.
The faulting traces have been added:
- misc/fault_opcode
- misc/fault_packet
See 'Documentation/fault-injection/fault-injection.txt'
for details.
Examples:
- Dropping packets by opcode:
/sys/kernel/debug/hfi1/hfi1_X/fault_opcode
# Enable fault
echo Y > fault_by_opcode
# Setprobability of dropping (0-100%)
# echo 25 > probability
# Set opcode
echo 0x64 > opcode
# Number of times to fault
echo 3 > times
# An optional mask allows you to fault
# a range of opcodes
echo 0xf0 > mask
/sys/kernel/debug/hfi1/hfi1_X/fault_stats
contains a value in parentheses to indicate
number of each opcode dropped.
- Dropping packets unconditionally
/sys/kernel/debug/hfi1/hfi1_X/fault_packet
# Enable fault
echo Y > fault_by_packet
/sys/kernel/debug/hfi1/hfi1_X/fault_packet/fault_stats
contains the number of packets dropped.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Don Hiatt <don.hiatt@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Update several usages of kmalloc/user_copy to memdup_copy and
memdup_copy_nul.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Both the 8051 memory and LCB register access require multiple
steps and coordination with the driver. This cannot be safely
done with resource0 alone.
The 8051 memory is exported read-only. LCB is exported read/write.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Add a debugfs sdma_cpu_list file that can be used to examine the CPU to
sdma engine assignments for the whole device.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Reviewed-by: Jianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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The debugfs RCU trips many debug kernel warnings because of potential
sleeps with an RCU read lock held. This includes both user copy calls
and slab allocations throughout the file.
This patch switches the RCU to use SRCU for file remove/access
race protection.
In one case, the SRCU is implicit in the use of the raw debugfs file
object and just works.
In the seq_file case, a wrapper around seq_read() and seq_lseek() is
used to enforce the SRCU using the debugfs supplied functions
debugfs_use_file_start() and debugfs_use_file_stop().
The sychronize_rcu() is deleted since the SRCU prevents the remove
access race.
The RCU locking is kept for qp_stats since the QP hash list is
protected using the non-sleepable RCU.
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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The qp init function does a kzalloc() while holding the RCU
lock that encounters the following warning with a debug kernel
when a cat of the qp_stats is done:
[ 231.723948] rcu_scheduler_active = 1, debug_locks = 0
[ 231.731939] 3 locks held by cat/11355:
[ 231.736492] #0: (debugfs_srcu){......}, at: [<ffffffff813001a5>] debugfs_use_file_start+0x5/0x90
[ 231.746955] #1: (&p->lock){+.+.+.}, at: [<ffffffff81289a6c>] seq_read+0x4c/0x3c0
[ 231.755873] #2: (rcu_read_lock){......}, at: [<ffffffffa0a0c535>] _qp_stats_seq_start+0x5/0xd0 [hfi1]
[ 231.766862]
The init functions do an implicit next which requires the rcu read lock
before the kzalloc().
Fix for both drivers is to change the scope of the init function to only
do the allocation and the initialization of the just allocated iter.
The implict next is moved back into the respective start functions to fix
the issue.
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
CC: <stable@vger.kernel.org> # 4.6.x-
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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The TODO list for the hfi1 driver was completed during 4.6. In addition
other objections raised (which are far beyond what was in the TODO list)
have been addressed as well. It is now time to remove the driver from
staging and into the drivers/infiniband sub-tree.
Reviewed-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Josh Collier
Matthew Wilcox
Greg Kroah-Hartman
Kaike Wan
Mitko Haralanov
Mike Marciniszyn
Linus Torvalds
Nicolai Stange
Michael J. Ruhl
Vishwanathapura, Niranjana
Don Hiatt
Dean Luick
Tadeusz Struk
Dennis Dalessandro