platform/kernel/linux-rpi.git
5 years agoiw_cxgb4: fix srqidx leak during connection abort
Raju Rangoju [Wed, 6 Feb 2019 17:24:44 +0000 (22:54 +0530)]
iw_cxgb4: fix srqidx leak during connection abort

When an application aborts the connection by moving QP from RTS to ERROR,
then iw_cxgb4's modify_rc_qp() RTS->ERROR logic sets the
*srqidxp to 0 via t4_set_wq_in_error(&qhp->wq, 0), and aborts the
connection by calling c4iw_ep_disconnect().

c4iw_ep_disconnect() does the following:
 1. sends up a close_complete_upcall(ep, -ECONNRESET) to libcxgb4.
 2. sends abort request CPL to hw.

But, since the close_complete_upcall() is sent before sending the
ABORT_REQ to hw, libcxgb4 would fail to release the srqidx if the
connection holds one. Because, the srqidx is passed up to libcxgb4 only
after corresponding ABORT_RPL is processed by kernel in abort_rpl().

This patch handle the corner-case by moving the call to
close_complete_upcall() from c4iw_ep_disconnect() to abort_rpl().  So that
libcxgb4 is notified about the -ECONNRESET only after abort_rpl(), and
libcxgb4 can relinquish the srqidx properly.

Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoiw_cxgb4: complete the cached SRQ buffers
Raju Rangoju [Wed, 6 Feb 2019 17:24:43 +0000 (22:54 +0530)]
iw_cxgb4: complete the cached SRQ buffers

If TP fetches an SRQ buffer but ends up not using it before the connection
is aborted, then it passes the index of that SRQ buffer to the host in
ABORT_REQ_RSS or ABORT_RPL CPL message.

But, if the srqidx field is zero in the received ABORT_RPL or
ABORT_REQ_RSS CPL, then we need to read the tcb.rq_start field to see if
it really did have an RQE cached. This works around a case where HW does
not include the srqidx in the ABORT_RPL/ABORT_REQ_RSS CPL.

The final value of rq_start is the one present in TCB with the
TF_RX_PDU_OUT bit cleared. So, we need to read the TCB, examine the
TF_RX_PDU_OUT (bit 49 of t_flags) in order to determine if there's a rx
PDU feedback event pending.

Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agocxgb4: add tcb flags and tcb rpl struct
Raju Rangoju [Wed, 6 Feb 2019 17:24:42 +0000 (22:54 +0530)]
cxgb4: add tcb flags and tcb rpl struct

This patch adds the tcb flags and structures needed for querying tcb
information.

Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/devices: Re-organize device.c locking
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:54 +0000 (22:41 -0700)]
RDMA/devices: Re-organize device.c locking

The locking here started out with a single lock that covered everything
and then has lately veered into crazy town.

The fundamental problem is that several places need to iterate over a
linked list, but also need to drop their locks to avoid deadlock during
client callbacks.

xarray's restartable iteration offers a simple solution to the
problem. Once all the lists are xarrays we can drop locks in the places
that need that and rely on xarray to provide consistency and locking for
the data structure.

The resulting simplification is that each of the three lists has a
dedicated rwsem that must be held when working with the list it
covers. One data structure is no longer covered by multiple locks.

The sleeping semaphore is selected because the read side generally needs
to be held over something sleeping, and using RCU reader locking in those
cases is overkill.

In the process this simplifies the entire registration/unregistration flow
to be the expected list of setups and the reversed list of matching
teardowns, and the registration lock 'refcount' can now be revised to be
released after the ULPs are removed, providing a very sane semantic for
this feature.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/devices: Use xarray to store the client_data
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:53 +0000 (22:41 -0700)]
RDMA/devices: Use xarray to store the client_data

Now that we have a small ID for each client we can use xarray instead of
linearly searching linked lists for client data. This will give much
faster and scalable client data lookup, and will lets us revise the
locking scheme.

Since xarray can store 'going_down' using a mark just entirely eliminate
the struct ib_client_data and directly store the client_data value in the
xarray. However this does require a special iterator as we must still
iterate over any NULL client_data values.

Also eliminate the client_data_lock in favour of internal xarray locking.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/devices: Use xarray to store the clients
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:52 +0000 (22:41 -0700)]
RDMA/devices: Use xarray to store the clients

This gives each client a unique ID and will let us move client_data to use
xarray, and revise the locking scheme.

clients have to be add/removed in strict FIFO/LIFO order as they
interdepend. To support this the client_ids are assigned to increase in
FIFO order. The existing linked list is kept to support reverse iteration
until xarray can get a reverse iteration API.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
5 years agoRDMA/device: Use an ida instead of a free page in alloc_name
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:51 +0000 (22:41 -0700)]
RDMA/device: Use an ida instead of a free page in alloc_name

ida is the proper data structure to hold list of clustered small integers
and then allocate an unused integer. Get rid of the convoluted and limited
open-coded bitmap.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/device: Get rid of reg_state
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:50 +0000 (22:41 -0700)]
RDMA/device: Get rid of reg_state

This really has no purpose anymore, refcount can be used to tell if the
device is still registered. Keeping it around just invites mis-use.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
5 years agoRDMA/device: Call ib_cache_release_one() only from ib_device_release()
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:49 +0000 (22:41 -0700)]
RDMA/device: Call ib_cache_release_one() only from ib_device_release()

Instead of complicated logic about when this memory is freed, always free
it during device release(). All the cache pointers start out as NULL, so
it is safe to call this before the cache is initialized.

This makes for a simpler error unwind flow, and a simpler understanding of
the lifetime of the memory allocations inside the struct ib_device.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/device: Ensure that security memory is always freed
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:48 +0000 (22:41 -0700)]
RDMA/device: Ensure that security memory is always freed

Since this only frees memory it should be done during the release
callback. Otherwise there are possible error flows where it might not get
called if registration aborts.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/device: Check that the rename is nop under the lock
Jason Gunthorpe [Thu, 7 Feb 2019 05:41:47 +0000 (22:41 -0700)]
RDMA/device: Check that the rename is nop under the lock

Since another rename could be running in parallel it is safer to check
that the name is not changing inside the lock, where we already know the
device name will not change.

Fixes: d21943dd19b5 ("RDMA/core: Implement IB device rename function")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
5 years agoRDMA: Handle PD allocations by IB/core
Leon Romanovsky [Sun, 3 Feb 2019 12:55:51 +0000 (14:55 +0200)]
RDMA: Handle PD allocations by IB/core

The PD allocations in IB/core allows us to simplify drivers and their
error flows in their .alloc_pd() paths. The changes in .alloc_pd() go hand
in had with relevant update in .dealloc_pd().

We will use this opportunity and convert .dealloc_pd() to don't fail, as
it was suggested a long time ago, failures are not happening as we have
never seen a WARN_ON print.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/core: Share driver structure size with core
Leon Romanovsky [Sun, 3 Feb 2019 12:55:50 +0000 (14:55 +0200)]
RDMA/core: Share driver structure size with core

Add new macros to be used in drivers while registering ops structure and
IB/core while calling allocation routines, so drivers won't need to
perform kzalloc/kfree in their paths.

The change in allocation stage allows us to initialize common fields prior
to calling to drivers (e.g. restrack).

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/core: Don't register each MAD agent for LSM notifier
Daniel Jurgens [Sat, 2 Feb 2019 09:09:45 +0000 (11:09 +0200)]
IB/core: Don't register each MAD agent for LSM notifier

When creating many MAD agents in a short period of time, receive packet
processing can be delayed long enough to cause timeouts while new agents
are being added to the atomic notifier chain with IRQs disabled.  Notifier
chain registration and unregstration is an O(n) operation. With large
numbers of MAD agents being created and destroyed simultaneously the CPUs
spend too much time with interrupts disabled.

Instead of each MAD agent registering for it's own LSM notification,
maintain a list of agents internally and register once, this registration
already existed for handling the PKeys. This list is write mostly, so a
normal spin lock is used vs a read/write lock. All MAD agents must be
checked, so a single list is used instead of breaking them down per
device.

Notifier calls are done under rcu_read_lock, so there isn't a risk of
similar packet timeouts while checking the MAD agents security settings
when notified.

Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/core: Eliminate a hole in MAD agent struct
Daniel Jurgens [Sat, 2 Feb 2019 09:09:44 +0000 (11:09 +0200)]
IB/core: Eliminate a hole in MAD agent struct

Move the security related fields above the u8s to eliminate a hole in the
struct.

pahole before:
struct ib_mad_agent {
...
u32                        hi_tid;               /*    48     4 */
u32                        flags;                /*    52     4 */
u8                         port_num;             /*    56     1 */
u8                         rmpp_version;         /*    57     1 */

/* XXX 6 bytes hole, try to pack */

/* --- cacheline 1 boundary (64 bytes) --- */
void *                     security;             /*    64     8 */
bool                       smp_allowed;          /*    72     1 */
bool                       lsm_nb_reg;           /*    73     1 */

/* XXX 6 bytes hole, try to pack */

struct notifier_block      lsm_nb;               /*    80    24 */

/* XXX last struct has 4 bytes of padding */

/* size: 104, cachelines: 2, members: 14 */
...
};

pahole after:
struct ib_mad_agent {
...
u32                        hi_tid;               /*    48     4 */
u32                        flags;                /*    52     4 */
void *                     security;             /*    56     8 */
/* --- cacheline 1 boundary (64 bytes) --- */
struct notifier_block      lsm_nb;               /*    64    24 */

/* XXX last struct has 4 bytes of padding */

u8                         port_num;             /*    88     1 */
u8                         rmpp_version;         /*    89     1 */
bool                       smp_allowed;          /*    90     1 */
bool                       lsm_nb_reg;           /*    91     1 */

/* size: 96, cachelines: 2, members: 14 */
...
};

Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/core: Fix potential memory leak while creating MAD agents
Daniel Jurgens [Sat, 2 Feb 2019 09:09:43 +0000 (11:09 +0200)]
IB/core: Fix potential memory leak while creating MAD agents

If the MAD agents isn't allowed to manage the subnet, or fails to register
for the LSM notifier, the security context is leaked. Free the context in
these cases.

Fixes: 47a2b338fe63 ("IB/core: Enforce security on management datagrams")
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Reported-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/core: Unregister notifier before freeing MAD security
Daniel Jurgens [Sat, 2 Feb 2019 09:09:42 +0000 (11:09 +0200)]
IB/core: Unregister notifier before freeing MAD security

If the notifier runs after the security context is freed an access of
freed memory can occur.

Fixes: 47a2b338fe63 ("IB/core: Enforce security on management datagrams")
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/usnic: Fix locking when unregistering
Parvi Kaustubhi [Fri, 8 Feb 2019 21:53:43 +0000 (13:53 -0800)]
IB/usnic: Fix locking when unregistering

Move the call to usnic_ib_device_remove after usnic_ib_ibdev_list_lock has
been released.

Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoiw_cxgb4: use tos when finding ipv6 routes
Steve Wise [Fri, 1 Feb 2019 20:44:53 +0000 (12:44 -0800)]
iw_cxgb4: use tos when finding ipv6 routes

When IPv6 support was added, the correct tos was not passed to
cxgb_find_route6(). This potentially results in the wrong route entry.

Fixes: 830662f6f032 ("RDMA/cxgb4: Add support for active and passive open connection with IPv6 address")
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoiw_cxgb4: use tos when importing the endpoint
Steve Wise [Fri, 1 Feb 2019 20:44:41 +0000 (12:44 -0800)]
iw_cxgb4: use tos when importing the endpoint

import_ep() is passed the correct tos, but doesn't use it correctly.

Fixes: ac8e4c69a021 ("cxgb4/iw_cxgb4: TOS support")
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoiw_cxgb4: use listening ep tos when accepting new connections
Steve Wise [Fri, 1 Feb 2019 20:44:37 +0000 (12:44 -0800)]
iw_cxgb4: use listening ep tos when accepting new connections

If the parent listening endpoint has a service type set, then use that
when setting up the connection.  This allows server-side applications to
mandate the tos for passive side connections via rdma_set_service_type()
on the listening endpoints.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/iwcm: add tos_set bool to iw_cm struct
Steve Wise [Fri, 1 Feb 2019 20:44:32 +0000 (12:44 -0800)]
RDMA/iwcm: add tos_set bool to iw_cm struct

This allows drivers to know the tos was actively set by the application.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/cma: listening device cm_ids should inherit tos
Steve Wise [Fri, 1 Feb 2019 20:44:27 +0000 (12:44 -0800)]
RDMA/cma: listening device cm_ids should inherit tos

If a user binds to INADDR_ANY and sets the service id, then the
device-specific cm_ids should also use this tos.  This allows an app to
do:

rdma_bind_addr(INADDR_ANY)
set_service_type()
rdma_listen()

And connections setup via this listening endpoint will use the correct
tos.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/cma: Define option to set ack timeout and pack tos_set
Danit Goldberg [Thu, 24 Jan 2019 12:18:15 +0000 (14:18 +0200)]
IB/cma: Define option to set ack timeout and pack tos_set

Define new option in 'rdma_set_option' to override calculated QP timeout
when requested to provide QP attributes to modify a QP.

At the same time, pack tos_set to be bitfield.

Signed-off-by: Danit Goldberg <danitg@mellanox.com>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_en: Enable RDMA driver support for 57500 chip
Devesh Sharma [Thu, 7 Feb 2019 06:31:28 +0000 (01:31 -0500)]
RDMA/bnxt_en: Enable RDMA driver support for 57500 chip

Re-enabling RDMA driver support on 57500 chips. Removing the forced error
code for 57500 chip.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Update kernel user abi to pass chip context
Devesh Sharma [Thu, 7 Feb 2019 06:31:27 +0000 (01:31 -0500)]
RDMA/bnxt_re: Update kernel user abi to pass chip context

User space verbs provider library would need chip context.  Changing the
ABI to add chip version details in structure.  Furthermore, changing the
kernel driver ucontext allocation code to initialize the abi structure
with appropriate values.

As suggested by community, appended the new fields at the bottom of the
ABI structure and retaining to older fields as those were in the older
versions.

Keeping the ABI version at 1 and adding a new field in the ucontext
response structure to hold the component mask.  The user space library
should check pre-defined flags to figure out if a certain feature is
supported on not.

Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Add extended psn structure for 57500 adapters
Devesh Sharma [Thu, 7 Feb 2019 06:31:26 +0000 (01:31 -0500)]
RDMA/bnxt_re: Add extended psn structure for 57500 adapters

The new 57500 series of adapter has bigger psn search structure.  The size
of new structure is 16B. Changing the control path memory allocation and
fast path code to accommodate the new psn structure while maintaining the
backward compatibility.

There are few additional changes listed below:
 - For 57500 chip max-sge are limited to 6 for now.
 - For 57500 chip max-receive-sge should be set to 6 for now.
 - Add driver/hardware interface structure for new chip.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Enable GSI QP support for 57500 series
Devesh Sharma [Thu, 7 Feb 2019 06:31:25 +0000 (01:31 -0500)]
RDMA/bnxt_re: Enable GSI QP support for 57500 series

In the new 57500 series of adapters the GSI qp is a UD type QP unlike the
previous generation where it was a Raw Eth QP. Changing the control and
data path to support the same. Listing all the significant diffs:

 - AH creation resolve network type unconditionally
 - Add check at relevant places to distinguish from Raw Eth
   processing flow.
 - bnxt_re_process_res_ud_wc report completion with GRH flag
   when qp is GSI.
 - Change length, cfa_meta and smac to match new driver/hardware
   interface.
 - Add new driver/hardware interface.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Skip backing store allocation for 57500 series
Devesh Sharma [Thu, 7 Feb 2019 06:31:24 +0000 (01:31 -0500)]
RDMA/bnxt_re: Skip backing store allocation for 57500 series

The backing store to keep HW context data structures is allocated and
initialized by L2 driver. For 57500 chip RoCE driver do not require to
allocate and initialize additional memory. Changing to skip duplicate
allocation and initialization for 57500 adapters. Driver continues as
before for older chips.

This patch also takes care of stats context memory alignment to 128
boundary, a requirement for 57500 series of chip. Older chips do not care
of alignment, thus the change is unconditional.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Add 64bit doorbells for 57500 series
Devesh Sharma [Thu, 7 Feb 2019 06:31:23 +0000 (01:31 -0500)]
RDMA/bnxt_re: Add 64bit doorbells for 57500 series

The new chip series has 64 bit doorbell for notification queues. Thus,
both control and data path event queues need new routines to write 64 bit
doorbell. Adding the same. There is new doorbell interface between the
chip and driver. Changing the chip specific data structure definitions.

Additional significant changes are listed below
- bnxt_re_net_ring_free/alloc takes a new argument
- bnxt_qplib_enable_nq and enable_rcfw uses new doorbell offset
  for new chip.
- DB mapping for NQ and CREQ now maps 8 bytes.
- DBR_DBR_* macros renames to DBC_DBC_*
- store nq_db_offset in a 32bit data type.
- got rid of __iowrite64_copy, used writeq instead.
- changed the DB header initialization to simpler scheme.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/bnxt_re: Add chip context to identify 57500 series
Devesh Sharma [Thu, 7 Feb 2019 06:31:22 +0000 (01:31 -0500)]
RDMA/bnxt_re: Add chip context to identify 57500 series

Adding setup and destroy routines for chip-context. The chip context would
be used frequently in control and data path to take execution flow
depending on the chip type.  chip context structure pointer is added to
the relevant data structures.

Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Simplify WQE count power of two check
Gal Pressman [Wed, 6 Feb 2019 13:45:35 +0000 (15:45 +0200)]
IB/mlx5: Simplify WQE count power of two check

Use is_power_of_2() instead of hard coding it in the driver. While at it,
fix the meaningless error print.

Signed-off-by: Gal Pressman <galpress@amazon.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoDocumentation/infiniband: update from locked to pinned_vm
Davidlohr Bueso [Thu, 7 Feb 2019 01:31:55 +0000 (17:31 -0800)]
Documentation/infiniband: update from locked to pinned_vm

We are really talking about pinned_vm here.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agodrivers/IB,core: reduce scope of mmap_sem
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:20 +0000 (09:59 -0800)]
drivers/IB,core: reduce scope of mmap_sem

ib_umem_get() uses gup_longterm() and relies on the lock to stabilze the
vma_list, so we cannot really get rid of mmap_sem altogether, but now that
the counter is atomic, we can get of some complexity that mmap_sem brings
with only pinned_vm.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agodrivers/IB,usnic: reduce scope of mmap_sem
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:19 +0000 (09:59 -0800)]
drivers/IB,usnic: reduce scope of mmap_sem

usnic_uiom_get_pages() uses gup_longterm() so we cannot really get rid of
mmap_sem altogether in the driver, but we can get rid of some complexity
that mmap_sem brings with only pinned_vm.  We can get rid of the wq
altogether as we no longer need to defer work to unpin pages as the
counter is now atomic. We also share the lock.

Acked-by: Parvi Kaustubhi <pkaustub@cisco.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agodrivers/IB,hfi1: do not se mmap_sem
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:18 +0000 (09:59 -0800)]
drivers/IB,hfi1: do not se mmap_sem

This driver already uses gup_fast() and thus we can just drop the mmap_sem
protection around the pinned_vm counter. Note that the window between when
hfi1_can_pin_pages() is called and the actual counter is incremented
remains the same as mmap_sem was _only_ used for when ->pinned_vm was
touched.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.det>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agodrivers/IB,qib: optimize mmap_sem usage
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:17 +0000 (09:59 -0800)]
drivers/IB,qib: optimize mmap_sem usage

The driver uses mmap_sem for both pinned_vm accounting and
get_user_pages(). Because rdma drivers might want to use gup_longterm() in
the future we still need some sort of mmap_sem serialization (as opposed
to removing it entirely by using gup_fast()). Now that pinned_vm is atomic
the writer lock can therefore be converted to reader.

This also fixes a bug that __qib_get_user_pages was not taking into
account the current value of pinned_vm.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agodrivers/mic/scif: do not use mmap_sem
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:16 +0000 (09:59 -0800)]
drivers/mic/scif: do not use mmap_sem

The driver uses mmap_sem for both pinned_vm accounting and
get_user_pages(). By using gup_fast() and letting the mm handle the lock
if needed, we can no longer rely on the semaphore and simplify the whole
thing.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agomm: make mm->pinned_vm an atomic64 counter
Davidlohr Bueso [Wed, 6 Feb 2019 17:59:15 +0000 (09:59 -0800)]
mm: make mm->pinned_vm an atomic64 counter

Taking a sleeping lock to _only_ increment a variable is quite the
overkill, and pretty much all users do this. Furthermore, some drivers
(ie: infiniband and scif) that need pinned semantics can go to quite
some trouble to actually delay via workqueue (un)accounting for pinned
pages when not possible to acquire it.

By making the counter atomic we no longer need to hold the mmap_sem and
can simply some code around it for pinned_vm users. The counter is 64-bit
such that we need not worry about overflows such as rdma user input
controlled from userspace.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/iwpm: move kdoc comments to functions
Steve Wise [Tue, 5 Feb 2019 19:33:22 +0000 (11:33 -0800)]
RDMA/iwpm: move kdoc comments to functions

Move the iwpm kdoc comments from the prototype declarations to above
the function bodies.  There are no functional changes in this patch.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/cma: Remove CM_ID statistics provided by rdma-cm module
Leon Romanovsky [Wed, 16 Jan 2019 07:55:41 +0000 (09:55 +0200)]
RDMA/cma: Remove CM_ID statistics provided by rdma-cm module

Netlink statistics exported by rdma-cm never had any working user space
component published to the mailing list or to any open source
project. Canvassing various proprietary users, and the original requester,
we find that there are no real users of this interface.

This patch simply removes all occurrences of RDMA CM netlink in favour of
modern nldev implementation, which provides the same information and
accompanied by widely used user space component.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Do not use hw_access_flags for be and CPU data
Bart Van Assche [Thu, 31 Jan 2019 00:30:51 +0000 (16:30 -0800)]
IB/mlx5: Do not use hw_access_flags for be and CPU data

Avoid that sparse reports the following for the mlx5 driver:

drivers/infiniband/hw/mlx5/qp.c:2671:34: warning: invalid assignment: |=
drivers/infiniband/hw/mlx5/qp.c:2671:34:    left side has type restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2671:34:    right side has type int
drivers/infiniband/hw/mlx5/qp.c:2679:34: warning: invalid assignment: |=
drivers/infiniband/hw/mlx5/qp.c:2679:34:    left side has type restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2679:34:    right side has type int
drivers/infiniband/hw/mlx5/qp.c:2680:34: warning: invalid assignment: |=
drivers/infiniband/hw/mlx5/qp.c:2680:34:    left side has type restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2680:34:    right side has type int
drivers/infiniband/hw/mlx5/qp.c:2684:34: warning: invalid assignment: |=
drivers/infiniband/hw/mlx5/qp.c:2684:34:    left side has type restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2684:34:    right side has type int
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: cast from restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: incorrect type in argument 1 (different base types)
drivers/infiniband/hw/mlx5/qp.c:2686:28:    expected unsigned int [usertype] val
drivers/infiniband/hw/mlx5/qp.c:2686:28:    got restricted __be32 [usertype]
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: cast from restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: cast from restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: cast from restricted __be32
drivers/infiniband/hw/mlx5/qp.c:2686:28: warning: cast from restricted __be32

This patch does not change any functionality.

Fixes: a60109dc9a95 ("IB/mlx5: Add support for extended atomic operations")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/IWPM: Support no port mapping requirements
Steve Wise [Tue, 29 Jan 2019 21:33:16 +0000 (13:33 -0800)]
RDMA/IWPM: Support no port mapping requirements

A soft iwarp driver that uses the host TCP stack via a kernel mode socket
does not need port mapping.  In fact, if the port map daemon, iwpmd, is
running, then iwpmd must not try and create/bind a socket to the actual
port for a soft iwarp connection, since the driver already has that socket
bound.

Yet if the soft iwarp driver wants to interoperate with hard iwarp devices
that -are- using port mapping, then the soft iwarp driver's mappings still
need to be maintained and advertised by the iwpm protocol.

This patch enhances the rdma driver<->iwcm interface to allow an iwarp
driver to specify that it does not want port mapping.  The iwpm
kernel<->iwpmd interface is also enhanced to pass up this information on
map requests.

Care is taken to interoperate with the current iwpmd version (ABI version
3) and only use the new NL attributes if iwpmd supports ABI version 4.

The ABI version define has also been created in rdma_netlink.h so both
kernel and user code can share it.  The iwcm and iwpmd negotiate the ABI
version to use with a new HELLO netlink message.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Tatyana Nikolova <Tatyana.E.Nikolova@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/IWPM: refactor the IWPM message attribute names
Steve Wise [Tue, 29 Jan 2019 21:33:11 +0000 (13:33 -0800)]
RDMA/IWPM: refactor the IWPM message attribute names

In order to add new IWPM_NL attributes, the enums for the IWPM commands
attributes are refactored such that a new attribute can be added without
breaking ABI version 3. Instead of sharing nl attribute enums for both
request and response messages, we create separate enums for each IWPM
message request and reply.  This allows us to extend any given IWPM
message by adding new attributes for just that message.  These new enums
are created, though, in a way to avoid breaking ABI version 3.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Tatyana Nikolova <Tatyana.E.Nikolova@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoiw_cxgb*: kzalloc the iwcm verbs struct
Steve Wise [Tue, 29 Jan 2019 21:33:07 +0000 (13:33 -0800)]
iw_cxgb*: kzalloc the iwcm verbs struct

So future additions to that struct get initialized by default.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/hns: Fix the chip hanging caused by sending doorbell during reset
Wei Hu (Xavier) [Sun, 3 Feb 2019 12:43:15 +0000 (20:43 +0800)]
RDMA/hns: Fix the chip hanging caused by sending doorbell during reset

On hi08 chip, There is a possibility of chip hanging when sending doorbell
during reset. We can fix it by prohibiting doorbell during reset.

Fixes: 2d40788825ac ("RDMA/hns: Add support for processing send wr and receive wr")
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/hns: Fix the chip hanging caused by sending mailbox&CMQ during reset
Wei Hu (Xavier) [Sun, 3 Feb 2019 12:43:14 +0000 (20:43 +0800)]
RDMA/hns: Fix the chip hanging caused by sending mailbox&CMQ during reset

On hi08 chip, There is a possibility of chip hanging and some errors when
sending mailbox & doorbell during reset.  We can fix it by prohibiting
mailbox and doorbell during reset and reset occurred to ensure that
hardware can work normally.

Fixes: a04ff739f2a9 ("RDMA/hns: Add command queue support for hip08 RoCE driver")
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/hns: Fix the Oops during rmmod or insmod ko when reset occurs
Wei Hu (Xavier) [Sun, 3 Feb 2019 12:43:13 +0000 (20:43 +0800)]
RDMA/hns: Fix the Oops during rmmod or insmod ko when reset occurs

In the reset process, the hns3 NIC driver notifies the RoCE driver to
perform reset related processing by calling the .reset_notify() interface
registered by the RoCE driver in hip08 SoC.

In the current version, if a reset occurs simultaneously during the
execution of rmmod or insmod ko, there may be Oops error as below:

 Internal error: Oops: 86000007 [#1] PREEMPT SMP
 Modules linked in: hns_roce(O) hns3(O) hclge(O) hnae3(O) [last unloaded: hns_roce_hw_v2]
 CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G           O      4.19.0-ge00d540 #1
 Hardware name: Huawei Technologies Co., Ltd.
 Workqueue: events hclge_reset_service_task [hclge]
 pstate: 60c00009 (nZCv daif +PAN +UAO)
 pc : 0xffff00000100b0b8
 lr : 0xffff00000100aea0
 sp : ffff000009afbab0
 x29: ffff000009afbab0 x28: 0000000000000800
 x27: 0000000000007ff0 x26: ffff80002f90c004
 x25: 00000000000007ff x24: ffff000008f97000
 x23: ffff80003efee0a8 x22: 0000000000001000
 x21: ffff80002f917ff0 x20: ffff8000286ea070
 x19: 0000000000000800 x18: 0000000000000400
 x17: 00000000c4d3225d x16: 00000000000021b8
 x15: 0000000000000400 x14: 0000000000000400
 x13: 0000000000000000 x12: ffff80003fac6e30
 x11: 0000800036303000 x10: 0000000000000001
 x9 : 0000000000000000 x8 : ffff80003016d000
 x7 : 0000000000000000 x6 : 000000000000003f
 x5 : 0000000000000040 x4 : 0000000000000000
 x3 : 0000000000000004 x2 : 00000000000007ff
 x1 : 0000000000000000 x0 : 0000000000000000
 Process kworker/0:1 (pid: 14, stack limit = 0x00000000af8f0ad9)
 Call trace:
  0xffff00000100b0b8
  0xffff00000100b3a0
  hns_roce_init+0x624/0xc88 [hns_roce]
  0xffff000001002df8
  0xffff000001006960
  hclge_notify_roce_client+0x74/0xe0 [hclge]
  hclge_reset_service_task+0xa58/0xbc0 [hclge]
  process_one_work+0x1e4/0x458
  worker_thread+0x40/0x450
  kthread+0x12c/0x130
  ret_from_fork+0x10/0x18
 Code: bad PC value

In the reset process, we will release the resources firstly, and after the
hardware reset is completed, we will reapply resources and reconfigure the
hardware.

We can solve this problem by modifying both the NIC and the RoCE
driver. We can modify the concurrent processing in the NIC driver to avoid
calling the .reset_notify and .uninit_instance ops at the same time. And
we need to modify the RoCE driver to record the reset stage and the
driver's init/uninit state, and check the state in the .reset_notify,
.init_instance. and uninit_instance functions to avoid NULL pointer
operation.

Fixes: cb7a94c9c808 ("RDMA/hns: Add reset process for RoCE in hip08")
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/rxe: Improve loopback marking
Kamal Heib [Tue, 29 Jan 2019 10:08:50 +0000 (12:08 +0200)]
RDMA/rxe: Improve loopback marking

Currently a packet is marked for loopback only if the source and
destination addresses equals. This is not enough when multiple gids are
present in rxe device's gid table and the traffic is from one gid to
another. Fix it by marking the packet for loopback if the destination MAC
address is equal to the source MAC address.

Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Tested-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/rxe: Move rxe_init_av() to rxe_av.c
Kamal Heib [Tue, 29 Jan 2019 10:08:49 +0000 (12:08 +0200)]
RDMA/rxe: Move rxe_init_av() to rxe_av.c

Move the function rxe_init_av() to rxe_av.c file and use it instead of
calling rxe_av_from_attr() and rxe_av_fill_ip_info(), also remove the
unused rxe_dev parameter from rxe_init_av().

Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoRDMA/hns: Make some function static
YueHaibing [Fri, 1 Feb 2019 03:11:04 +0000 (11:11 +0800)]
RDMA/hns: Make some function static

Fixes the following sparse warnings:

drivers/infiniband/hw/hns/hns_roce_hw_v2.c:5822:5: warning:
 symbol 'hns_roce_v2_query_srq' was not declared. Should it be static?
drivers/infiniband/hw/hns/hns_roce_srq.c:158:6: warning:
 symbol 'hns_roce_srq_free' was not declared. Should it be static?
drivers/infiniband/hw/hns/hns_roce_srq.c:81:5: warning:
 symbol 'hns_roce_srq_alloc' was not declared. Should it be static?

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoMerge tag 'v5.0-rc5' into rdma.git for-next
Jason Gunthorpe [Mon, 4 Feb 2019 21:53:42 +0000 (14:53 -0700)]
Merge tag 'v5.0-rc5' into rdma.git for-next

Linux 5.0-rc5

Needed to merge the include/uapi changes so we have an up to date
single-tree for these files. Patches already posted are also expected to
need this for dependencies.

5 years agoIB/core: Remove ib_sg_dma_address() and ib_sg_dma_len()
Bart Van Assche [Thu, 31 Jan 2019 16:30:34 +0000 (08:30 -0800)]
IB/core: Remove ib_sg_dma_address() and ib_sg_dma_len()

Keeping single line wrapper functions is not useful. Hence remove the
ib_sg_dma_address() and ib_sg_dma_len() functions. This patch does not
change any functionality.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Advertise XRC ODP support
Moni Shoua [Tue, 22 Jan 2019 06:48:50 +0000 (08:48 +0200)]
IB/mlx5: Advertise XRC ODP support

Query all per transport caps for XRC and set the appropriate bits in the
per transport field of the advertised struct.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Advertise SRQ ODP support for supported transports
Moni Shoua [Tue, 22 Jan 2019 06:48:48 +0000 (08:48 +0200)]
IB/mlx5: Advertise SRQ ODP support for supported transports

ODP support in SRQ is per transport capability. Based on device
capabilities set this flag in device structure for future queries.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Add ODP SRQ support
Moni Shoua [Tue, 22 Jan 2019 06:48:47 +0000 (08:48 +0200)]
IB/mlx5: Add ODP SRQ support

Add changes to the WQE page-fault handler to

1. Identify that the event is for a SRQ WQE
2. Pass SRQ object instead of a QP to the function that reads the WQE
3. Parse the SRQ WQE with respect to its structure

The rest is handled as for regular RQ WQE.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Let read user wqe also from SRQ buffer
Moni Shoua [Tue, 22 Jan 2019 06:48:46 +0000 (08:48 +0200)]
IB/mlx5: Let read user wqe also from SRQ buffer

Reading a WQE from SRQ is almost identical to reading from regular RQ.
The differences are the size of the queue, the size of a WQE and buffer
location.

Make necessary changes to mlx5_ib_read_user_wqe() to let it read a WQE
from a SRQ or RQ by caller choice.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Add XRC initiator ODP support
Moni Shoua [Tue, 22 Jan 2019 06:48:45 +0000 (08:48 +0200)]
IB/mlx5: Add XRC initiator ODP support

Skip XRC segment in the beginning of a send WQE and fetch ODP XRC
capabilities when QP type is IB_QPT_XRC_INI. The rest of the handling is
the same as in RC QP.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Clean mlx5_ib_mr_responder_pfault_handler() signature
Moni Shoua [Tue, 22 Jan 2019 06:48:44 +0000 (08:48 +0200)]
IB/mlx5: Clean mlx5_ib_mr_responder_pfault_handler() signature

In the function mlx5_ib_mr_responder_pfault_handler()

1. The parameter wqe is used as read-only so there is no need to pass it
   by reference.
2. Remove the unused argument pfault from list of arguments.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Remove useless check in ODP handler
Moni Shoua [Tue, 22 Jan 2019 06:48:43 +0000 (08:48 +0200)]
IB/mlx5: Remove useless check in ODP handler

When handling an ODP event for a receive WQE in SRQ the target QP is
unknown. Therefore, it is wrong to ask if QP has a SRQ in the page-fault
handler.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/uverbs: Expose XRC ODP device capabilities
Moni Shoua [Tue, 22 Jan 2019 06:48:42 +0000 (08:48 +0200)]
IB/uverbs: Expose XRC ODP device capabilities

Expose XRC ODP capabilities as part of the extended device capabilities.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/core: Allocate a bit for SRQ ODP support
Moni Shoua [Tue, 22 Jan 2019 06:48:41 +0000 (08:48 +0200)]
IB/core: Allocate a bit for SRQ ODP support

The ODP support matrix is per operation and per transport. The support for
each transport (RC, UD, etc.) is described with a bit field.

ODP for SRQ WQEs is considered a different kind of support from ODP for RQ
WQs and therefore needs a different capability bit.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoIB/mlx5: Fix the locking of SRQ objects in ODP events
Moni Shoua [Tue, 22 Jan 2019 06:48:40 +0000 (08:48 +0200)]
IB/mlx5: Fix the locking of SRQ objects in ODP events

QP and SRQ objects are stored in different containers so the action to get
and lock a common resource during ODP event needs to address that.

While here get rid of 'refcount' and 'free' fields in mlx5_core_srq struct
and use the fields with same semantics in common structure.

Fixes: 032080ab43ac ("IB/mlx5: Lock QP during page fault handling")
Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
5 years agoMerge branch 'mlx5-next into rdma.git for-next
Jason Gunthorpe [Mon, 4 Feb 2019 21:33:02 +0000 (14:33 -0700)]
Merge branch 'mlx5-next into rdma.git for-next

From
git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux

For dependencies needed in the next ODP patches.

* branch 'mlx5-next':
  net/mlx5: Set ODP SRQ support in firmware
  net/mlx5: Add XRC transport to ODP device capabilities layout

5 years agoLinux 5.0-rc5
Linus Torvalds [Sun, 3 Feb 2019 21:48:04 +0000 (13:48 -0800)]
Linux 5.0-rc5

5 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 3 Feb 2019 17:08:12 +0000 (09:08 -0800)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "A few updates for x86:

   - Fix an unintended sign extension issue in the fault handling code

   - Rename the new resource control config switch so it's less
     confusing

   - Avoid setting up EFI info in kexec when the EFI runtime is
     disabled.

   - Fix the microcode version check in the AMD microcode loader so it
     only loads higher version numbers and never downgrades

   - Set EFER.LME in the 32bit trampoline before returning to long mode
     to handle older AMD/KVM behaviour properly.

   - Add Darren and Andy as x86/platform reviewers"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Avoid confusion over the new X86_RESCTRL config
  x86/kexec: Don't setup EFI info if EFI runtime is not enabled
  x86/microcode/amd: Don't falsely trick the late loading mechanism
  MAINTAINERS: Add Andy and Darren as arch/x86/platform/ reviewers
  x86/fault: Fix sign-extend unintended sign extension
  x86/boot/compressed/64: Set EFER.LME=1 in 32-bit trampoline before returning to long mode
  x86/cpu: Add Atom Tremont (Jacobsville)

5 years agoMerge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 3 Feb 2019 17:02:03 +0000 (09:02 -0800)]
Merge branch 'smp-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull cpu hotplug fixes from Thomas Gleixner:
 "Two fixes for the cpu hotplug machinery:

   - Replace the overly clever 'SMT disabled by BIOS' detection logic as
     it breaks KVM scenarios and prevents speculation control updates
     when the Hyperthreads are brought online late after boot.

   - Remove a redundant invocation of the speculation control update
     function"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM
  x86/speculation: Remove redundant arch_smt_update() invocation

5 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 3 Feb 2019 16:59:51 +0000 (08:59 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Thomas Gleixner:
 "A pile of perf updates:

   - Fix broken sanity check in the /proc/sys/kernel/perf_cpu_time_max_percent
     write handler

   - Cure a perf script crash which caused by an unitinialized data
     structure

   - Highlight the hottest instruction in perf top and not a random one

   - Cure yet another clang issue when building perf python

   - Handle topology entries with no CPU correctly in the tools

   - Handle perf data which contains both tracepoints and performance
     counter entries correctly.

   - Add a missing NULL pointer check in perf ordered_events_free()"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf script: Fix crash when processing recorded stat data
  perf top: Fix wrong hottest instruction highlighted
  perf tools: Handle TOPOLOGY headers with no CPU
  perf python: Remove -fstack-clash-protection when building with some clang versions
  perf core: Fix perf_proc_update_handler() bug
  perf script: Fix crash with printing mixed trace point and other events
  perf ordered_events: Fix crash in ordered_events__free

5 years agoMerge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 3 Feb 2019 16:57:05 +0000 (08:57 -0800)]
Merge branch 'efi-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull EFI fix from Thomas Gleixner:
 "The dump info for the efi page table debugging lacks a terminator
  which causes the kernel to crash when the debugfile is read"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/arm64: Fix debugfs crash by adding a terminator for ptdump marker

5 years agoMerge tag 'for-5.0-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
Linus Torvalds [Sun, 3 Feb 2019 16:48:33 +0000 (08:48 -0800)]
Merge tag 'for-5.0-rc4-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - regression fix: transaction commit can run away due to delayed ref
   waiting heuristic, this is not necessary now because of the proper
   reservation mechanism introduced in 5.0

 - regression fix: potential crash due to use-before-check of an ERR_PTR
   return value

 - fix for transaction abort during transaction commit that needs to
   properly clean up pending block groups

 - fix deadlock during b-tree node/leaf splitting, when this happens on
   some of the fundamental trees, we must prevent new tree block
   allocation to re-enter indirectly via the block group flushing path

 - potential memory leak after errors during mount

* tag 'for-5.0-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: On error always free subvol_name in btrfs_mount
  btrfs: clean up pending block groups when transaction commit aborts
  btrfs: fix potential oops in device_list_add
  btrfs: don't end the transaction for delayed refs in throttle
  Btrfs: fix deadlock when allocating tree block during leaf/node split

5 years agonet/mlx5: Set ODP SRQ support in firmware
Moni Shoua [Tue, 22 Jan 2019 06:48:51 +0000 (08:48 +0200)]
net/mlx5: Set ODP SRQ support in firmware

To avoid compatibility issue with older kernels the firmware doesn't
allow SRQ to work with ODP unless kernel asks for it.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
5 years agonet/mlx5: Add XRC transport to ODP device capabilities layout
Moni Shoua [Tue, 22 Jan 2019 06:48:49 +0000 (08:48 +0200)]
net/mlx5: Add XRC transport to ODP device capabilities layout

The device capabilities for ODP structure was missing the field for XRC
transport so add it here.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
5 years agoMerge tag 'devicetree-fixes-for-5.0-3' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 2 Feb 2019 18:34:32 +0000 (10:34 -0800)]
Merge tag 'devicetree-fixes-for-5.0-3' of git://git./linux/kernel/git/robh/linux

Pull Devicetree fix from Rob Herring:
 "A single fix for building DT bindings in-tree"

* tag 'devicetree-fixes-for-5.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: Fix dt_binding_check target for in tree builds

5 years agoMerge tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 2 Feb 2019 18:26:14 +0000 (10:26 -0800)]
Merge tag 'riscv-for-linus-5.0-rc5' of git://git./linux/kernel/git/palmer/riscv-linux

Pull RISC-V fixes from Palmer Dabbelt:
 "This contains a handful of mostly-independent patches:

   - make our port respect TIF_NEED_RESCHED, which fixes
     CONFIG_PREEMPT=y kernels

   - fix double-put of OF nodes

   - fix a misspelling of target in our Kconfig

   - generic PCIe is enabled in our defconfig

   - fix our SBI early console to properly handle line
     endings

   - fix max_low_pfn being counted in PFNs

   - a change to TASK_UNMAPPED_BASE to match what other
     arches do

  This has passed my standard 'boot Fedora' flow"

* tag 'riscv-for-linus-5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/riscv-linux:
  riscv: Adjust mmap base address at a third of task size
  riscv: fixup max_low_pfn with PFN_DOWN.
  tty/serial: use uart_console_write in the RISC-V SBL early console
  RISC-V: defconfig: Add CRYPTO_DEV_VIRTIO=y
  RISC-V: defconfig: Enable Generic PCIE by default
  RISC-V: defconfig: Move CONFIG_PCI{,E_XILINX}
  RISC-V: Kconfig: fix spelling mistake "traget" -> "target"
  RISC-V: asm/page.h: fix spelling mistake "CONFIG_64BITS" -> "CONFIG_64BIT"
  RISC-V: fix bad use of of_node_put
  RISC-V: Add _TIF_NEED_RESCHED check for kernel thread when CONFIG_PREEMPT=y

5 years agoMerge tag 'for-linus-20190202' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 2 Feb 2019 18:16:28 +0000 (10:16 -0800)]
Merge tag 'for-linus-20190202' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A few fixes that should go into this release. This contains:

   - MD pull request from Song, fixing a recovery OOM issue (Alexei)

   - Fix for a sync related stall (Jianchao)

   - Dummy callback for timeouts (Tetsuo)

   - IDE atapi sense ordering fix (me)"

* tag 'for-linus-20190202' of git://git.kernel.dk/linux-block:
  ide: ensure atapi sense request aren't preempted
  blk-mq: fix a hung issue when fsync
  block: pass no-op callback to INIT_WORK().
  md/raid5: fix 'out of memory' during raid cache recovery

5 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 2 Feb 2019 18:12:53 +0000 (10:12 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Five minor bug fixes.

  The libfc one is a tiny memory leak, the zfcp one is an incorrect user
  visible parameter and the rest are on error legs or obscure features"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: 53c700: pass correct "dev" to dma_alloc_attrs()
  scsi: bnx2fc: Fix error handling in probe()
  scsi: scsi_debug: fix write_same with virtual_gb problem
  scsi: libfc: free skb when receiving invalid flogi resp
  scsi: zfcp: fix sysfs block queue limit output for max_segment_size

5 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Sat, 2 Feb 2019 17:32:58 +0000 (09:32 -0800)]
Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "24 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (24 commits)
  autofs: fix error return in autofs_fill_super()
  autofs: drop dentry reference only when it is never used
  fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
  mm: migrate: don't rely on __PageMovable() of newpage after unlocking it
  psi: clarify the Kconfig text for the default-disable option
  mm, memory_hotplug: __offline_pages fix wrong locking
  mm: hwpoison: use do_send_sig_info() instead of force_sig()
  kasan: mark file common so ftrace doesn't trace it
  init/Kconfig: fix grammar by moving a closing parenthesis
  lib/test_kmod.c: potential double free in error handling
  mm, oom: fix use-after-free in oom_kill_process
  mm/hotplug: invalid PFNs from pfn_to_online_page()
  mm,memory_hotplug: fix scan_movable_pages() for gigantic hugepages
  psi: fix aggregation idle shut-off
  mm, memory_hotplug: test_pages_in_a_zone do not pass the end of zone
  mm, memory_hotplug: is_mem_section_removable do not pass the end of a zone
  oom, oom_reaper: do not enqueue same task twice
  mm: migrate: make buffer_migrate_page_norefs() actually succeed
  kernel/exit.c: release ptraced tasks before zap_pid_ns_processes
  x86_64: increase stack size for KASAN_EXTRA
  ...

5 years agoefi/arm64: Fix debugfs crash by adding a terminator for ptdump marker
Qian Cai [Sat, 2 Feb 2019 09:50:17 +0000 (10:50 +0100)]
efi/arm64: Fix debugfs crash by adding a terminator for ptdump marker

When reading 'efi_page_tables' debugfs triggers an out-of-bounds access here:

  arch/arm64/mm/dump.c: 282
  if (addr >= st->marker[1].start_address) {

called from:

  arch/arm64/mm/dump.c: 331
  note_page(st, addr, 2, pud_val(pud));

because st->marker++ is is called after "UEFI runtime end" which is the
last element in addr_marker[]. Therefore, add a terminator like the one
for kernel_page_tables, so it can be skipped to print out non-existent
markers.

Here's the KASAN bug report:

  # cat /sys/kernel/debug/efi_page_tables
  ---[ UEFI runtime start ]---
  0x0000000020000000-0x0000000020010000          64K PTE       RW NX SHD AF ...
  0x0000000020200000-0x0000000021340000       17664K PTE       RW NX SHD AF ...
  ...
  0x0000000021920000-0x0000000021950000         192K PTE       RW x  SHD AF ...
  0x0000000021950000-0x00000000219a0000         320K PTE       RW NX SHD AF ...
  ---[ UEFI runtime end ]---
  ---[ (null) ]---
  ---[ (null) ]---

   BUG: KASAN: global-out-of-bounds in note_page+0x1f0/0xac0
   Read of size 8 at addr ffff2000123f2ac0 by task read_all/42464
   Call trace:
    dump_backtrace+0x0/0x298
    show_stack+0x24/0x30
    dump_stack+0xb0/0xdc
    print_address_description+0x64/0x2b0
    kasan_report+0x150/0x1a4
    __asan_report_load8_noabort+0x30/0x3c
    note_page+0x1f0/0xac0
    walk_pgd+0xb4/0x244
    ptdump_walk_pgd+0xec/0x140
    ptdump_show+0x40/0x50
    seq_read+0x3f8/0xad0
    full_proxy_read+0x9c/0xc0
    __vfs_read+0xfc/0x4c8
    vfs_read+0xec/0x208
    ksys_read+0xd0/0x15c
    __arm64_sys_read+0x84/0x94
    el0_svc_handler+0x258/0x304
    el0_svc+0x8/0xc

  The buggy address belongs to the variable:
   __compound_literal.0+0x20/0x800

  Memory state around the buggy address:
   ffff2000123f2980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
   ffff2000123f2a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa
  >ffff2000123f2a80: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00
                                            ^
   ffff2000123f2b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
   ffff2000123f2b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0

[ ardb: fix up whitespace ]
[ mingo: fix up some moar ]

Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Fixes: 9d80448ac92b ("efi/arm64: Add debugfs node to dump UEFI runtime page tables")
Link: http://lkml.kernel.org/r/20190202095017.13799-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
5 years agox86/resctrl: Avoid confusion over the new X86_RESCTRL config
Johannes Weiner [Tue, 29 Jan 2019 22:44:36 +0000 (17:44 -0500)]
x86/resctrl: Avoid confusion over the new X86_RESCTRL config

"Resource Control" is a very broad term for this CPU feature, and a term
that is also associated with containers, cgroups etc. This can easily
cause confusion.

Make the user prompt more specific. Match the config symbol name.

 [ bp: In the future, the corresponding ARM arch-specific code will be
   under ARM_CPU_RESCTRL and the arch-agnostic bits will be carved out
   under the CPU_RESCTRL umbrella symbol. ]

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Babu Moger <Babu.Moger@amd.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morse <james.morse@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: linux-doc@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pu Wen <puwen@hygon.cn>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190130195621.GA30653@cmpxchg.org
5 years agoMerge tag 'xtensa-20190201' of git://github.com/jcmvbkbc/linux-xtensa
Linus Torvalds [Sat, 2 Feb 2019 00:56:30 +0000 (16:56 -0800)]
Merge tag 'xtensa-20190201' of git://github.com/jcmvbkbc/linux-xtensa

Pull xtensa fixes from Max Filippov:

 - fix ccount_timer_shutdown for secondary CPUs

 - fix secondary CPU initialization

 - fix secondary CPU reset vector clash with double exception vector

 - fix present CPUs when booting with 'maxcpus' parameter

 - limit possible CPUs by configured NR_CPUS

 - issue a warning if xtensa PIC is asked to retrigger anything other
   than software IRQ

 - fix masking/unmasking of the first two IRQs on xtensa MX PIC

 - fix typo in Kconfig description for user space unaligned access
   feature

 - fix Kconfig warning for selecting BUILTIN_DTB

* tag 'xtensa-20190201' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: SMP: limit number of possible CPUs by NR_CPUS
  xtensa: rename BUILTIN_DTB to BUILTIN_DTB_SOURCE
  xtensa: Fix typo use space=>user space
  drivers/irqchip: xtensa-mx: fix mask and unmask
  drivers/irqchip: xtensa: add warning to irq_retrigger
  xtensa: SMP: mark each possible CPU as present
  xtensa: smp_lx200_defconfig: fix vectors clash
  xtensa: SMP: fix secondary CPU initialization
  xtensa: SMP: fix ccount_timer_shutdown

5 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Sat, 2 Feb 2019 00:54:25 +0000 (16:54 -0800)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "Although we're still debugging a few minor arm64-specific issues in
  mainline, I didn't want to hold this lot up in the meantime.

  We've got an additional KASLR fix after the previous one wasn't quite
  complete, a fix for a performance regression when mapping executable
  pages into userspace and some fixes for kprobe blacklisting. All
  candidates for stable.

  Summary:

   - Fix module loading when KASLR is configured but disabled at runtime

   - Fix accidental IPI when mapping user executable pages

   - Ensure hyp-stub and KVM world switch code cannot be kprobed"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: hibernate: Clean the __hyp_text to PoC after resume
  arm64: hyp-stub: Forbid kprobing of the hyp-stub
  arm64: kprobe: Always blacklist the KVM world-switch code
  arm64: kaslr: ensure randomized quantities are clean also when kaslr is off
  arm64: Do not issue IPIs for user executable ptes

5 years agoMerge tag '5.0-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Sat, 2 Feb 2019 00:53:01 +0000 (16:53 -0800)]
Merge tag '5.0-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb3 fixes from Steve French:
 "SMB3 fixes, some from this week's SMB3 test evemt, 5 for stable and a
  particularly important one for queryxattr (see xfstests 70 and 117)"

* tag '5.0-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: update internal module version number
  CIFS: fix use-after-free of the lease keys
  CIFS: Do not consider -ENODATA as stat failure for reads
  CIFS: Do not count -ENODATA as failure for query directory
  CIFS: Fix trace command logging for SMB2 reads and writes
  CIFS: Fix possible oops and memory leaks in async IO
  cifs: limit amount of data we request for xattrs to CIFSMaxBufSize
  cifs: fix computation for MAX_SMB2_HDR_SIZE

5 years agoMerge tag 'apparmor-pr-2019-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 2 Feb 2019 00:18:38 +0000 (16:18 -0800)]
Merge tag 'apparmor-pr-2019-02-01' of git://git./linux/kernel/git/jj/linux-apparmor

Pull apparmor bug fixes from John Johansen:
 "Two bug fixes for apparmor:

   - Fix aa_label_build() error handling for failed merges

   - Fix warning about unused function apparmor_ipv6_postroute"

* tag 'apparmor-pr-2019-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
  apparmor: Fix aa_label_build() error handling for failed merges
  apparmor: Fix warning about unused function apparmor_ipv6_postroute

5 years agoautofs: fix error return in autofs_fill_super()
Ian Kent [Fri, 1 Feb 2019 22:21:29 +0000 (14:21 -0800)]
autofs: fix error return in autofs_fill_super()

In autofs_fill_super() on error of get inode/make root dentry the return
should be ENOMEM as this is the only failure case of the called
functions.

Link: http://lkml.kernel.org/r/154725123240.11260.796773942606871359.stgit@pluto-themaw-net
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agoautofs: drop dentry reference only when it is never used
Pan Bian [Fri, 1 Feb 2019 22:21:26 +0000 (14:21 -0800)]
autofs: drop dentry reference only when it is never used

autofs_expire_run() calls dput(dentry) to drop the reference count of
dentry.  However, dentry is read via autofs_dentry_ino(dentry) after
that.  This may result in a use-free-bug.  The patch drops the reference
count of dentry only when it is never used.

Link: http://lkml.kernel.org/r/154725122396.11260.16053424107144453867.stgit@pluto-themaw-net
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agofs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
Jan Kara [Fri, 1 Feb 2019 22:21:23 +0000 (14:21 -0800)]
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()

When superblock has lots of inodes without any pagecache (like is the
case for /proc), drop_pagecache_sb() will iterate through all of them
without dropping sb->s_inode_list_lock which can lead to softlockups
(one of our customers hit this).

Fix the problem by going to the slow path and doing cond_resched() in
case the process needs rescheduling.

Link: http://lkml.kernel.org/r/20190114085343.15011-1-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm: migrate: don't rely on __PageMovable() of newpage after unlocking it
David Hildenbrand [Fri, 1 Feb 2019 22:21:19 +0000 (14:21 -0800)]
mm: migrate: don't rely on __PageMovable() of newpage after unlocking it

We had a race in the old balloon compaction code before b1123ea6d3b3
("mm: balloon: use general non-lru movable page feature") refactored it
that became visible after backporting 195a8c43e93d ("virtio-balloon:
deflate via a page list") without the refactoring.

The bug existed from commit d6d86c0a7f8d ("mm/balloon_compaction:
redesign ballooned pages management") till b1123ea6d3b3 ("mm: balloon:
use general non-lru movable page feature").  d6d86c0a7f8d
("mm/balloon_compaction: redesign ballooned pages management") was
backported to 3.12, so the broken kernels are stable kernels [3.12 -
4.7].

There was a subtle race between dropping the page lock of the newpage in
__unmap_and_move() and checking for __is_movable_balloon_page(newpage).

Just after dropping this page lock, virtio-balloon could go ahead and
deflate the newpage, effectively dequeueing it and clearing PageBalloon,
in turn making __is_movable_balloon_page(newpage) fail.

This resulted in dropping the reference of the newpage via
putback_lru_page(newpage) instead of put_page(newpage), leading to
page->lru getting modified and a !LRU page ending up in the LRU lists.
With 195a8c43e93d ("virtio-balloon: deflate via a page list")
backported, one would suddenly get corrupted lists in
release_pages_balloon():

- WARNING: CPU: 13 PID: 6586 at lib/list_debug.c:59 __list_del_entry+0xa1/0xd0
- list_del corruption. prev->next should be ffffe253961090a0, but was dead000000000100

Nowadays this race is no longer possible, but it is hidden behind very
ugly handling of __ClearPageMovable() and __PageMovable().

__ClearPageMovable() will not make __PageMovable() fail, only
PageMovable().  So the new check (__PageMovable(newpage)) will still
hold even after newpage was dequeued by virtio-balloon.

If anybody would ever change that special handling, the BUG would be
introduced again.  So instead, make it explicit and use the information
of the original isolated page before migration.

This patch can be backported fairly easy to stable kernels (in contrast
to the refactoring).

Link: http://lkml.kernel.org/r/20190129233217.10747-1-david@redhat.com
Fixes: d6d86c0a7f8d ("mm/balloon_compaction: redesign ballooned pages management")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reported-by: Vratislav Bendel <vbendel@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Vratislav Bendel <vbendel@redhat.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org> [3.12 - 4.7]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agopsi: clarify the Kconfig text for the default-disable option
Johannes Weiner [Fri, 1 Feb 2019 22:21:15 +0000 (14:21 -0800)]
psi: clarify the Kconfig text for the default-disable option

The current help text caused some confusion in online forums about
whether or not to default-enable or default-disable psi in vendor
kernels.  This is because it doesn't communicate the reason for why we
made this setting configurable in the first place: that the overhead is
non-zero in an artificial scheduler stress test.

Since this isn't representative of real workloads, and the effect was
not measurable in scheduler-heavy real world applications such as the
webservers and memcache installations at Facebook, it's fair to point
out that this is a pretty cautious option to select.

Link: http://lkml.kernel.org/r/20190129233617.16767-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm, memory_hotplug: __offline_pages fix wrong locking
Michal Hocko [Fri, 1 Feb 2019 22:21:12 +0000 (14:21 -0800)]
mm, memory_hotplug: __offline_pages fix wrong locking

Jan has noticed that we do double unlock on some failure paths when
offlining a page range.  This is indeed the case when
test_pages_in_a_zone respp.  start_isolate_page_range fail.  This was an
omission when forward porting the debugging patch from an older kernel.

Fix the issue by dropping mem_hotplug_done from the failure condition
and keeping the single unlock in the catch all failure path.

Link: http://lkml.kernel.org/r/20190115120307.22768-1-mhocko@kernel.org
Fixes: 7960509329c2 ("mm, memory_hotplug: print reason for the offlining failure")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm: hwpoison: use do_send_sig_info() instead of force_sig()
Naoya Horiguchi [Fri, 1 Feb 2019 22:21:08 +0000 (14:21 -0800)]
mm: hwpoison: use do_send_sig_info() instead of force_sig()

Currently memory_failure() is racy against process's exiting, which
results in kernel crash by null pointer dereference.

The root cause is that memory_failure() uses force_sig() to forcibly
kill asynchronous (meaning not in the current context) processes.  As
discussed in thread https://lkml.org/lkml/2010/6/8/236 years ago for OOM
fixes, this is not a right thing to do.  OOM solves this issue by using
do_send_sig_info() as done in commit d2d393099de2 ("signal:
oom_kill_task: use SEND_SIG_FORCED instead of force_sig()"), so this
patch is suggesting to do the same for hwpoison.  do_send_sig_info()
properly accesses to siglock with lock_task_sighand(), so is free from
the reported race.

I confirmed that the reported bug reproduces with inserting some delay
in kill_procs(), and it never reproduces with this patch.

Note that memory_failure() can send another type of signal using
force_sig_mceerr(), and the reported race shouldn't happen on it because
force_sig_mceerr() is called only for synchronous processes (i.e.
BUS_MCEERR_AR happens only when some process accesses to the corrupted
memory.)

Link: http://lkml.kernel.org/r/20190116093046.GA29835@hori1.linux.bs1.fc.nec.co.jp
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reported-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agokasan: mark file common so ftrace doesn't trace it
Anders Roxell [Fri, 1 Feb 2019 22:21:05 +0000 (14:21 -0800)]
kasan: mark file common so ftrace doesn't trace it

When option CONFIG_KASAN is enabled toghether with ftrace, function
ftrace_graph_caller() gets in to a recursion, via functions
kasan_check_read() and kasan_check_write().

 Breakpoint 2, ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179
 179             mcount_get_pc             x0    //     function's pc
 (gdb) bt
 #0  ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:179
 #1  0xffffff90101406c8 in ftrace_caller () at ../arch/arm64/kernel/entry-ftrace.S:151
 #2  0xffffff90106fd084 in kasan_check_write (p=0xffffffc06c170878, size=4) at ../mm/kasan/common.c:105
 #3  0xffffff90104a2464 in atomic_add_return (v=<optimized out>, i=<optimized out>) at ./include/generated/atomic-instrumented.h:71
 #4  atomic_inc_return (v=<optimized out>) at ./include/generated/atomic-fallback.h:284
 #5  trace_graph_entry (trace=0xffffffc03f5ff380) at ../kernel/trace/trace_functions_graph.c:441
 #6  0xffffff9010481774 in trace_graph_entry_watchdog (trace=<optimized out>) at ../kernel/trace/trace_selftest.c:741
 #7  0xffffff90104a185c in function_graph_enter (ret=<optimized out>, func=<optimized out>, frame_pointer=18446743799894897728, retp=<optimized out>) at ../kernel/trace/trace_functions_graph.c:196
 #8  0xffffff9010140628 in prepare_ftrace_return (self_addr=18446743592948977792, parent=0xffffffc03f5ff418, frame_pointer=18446743799894897728) at ../arch/arm64/kernel/ftrace.c:231
 #9  0xffffff90101406f4 in ftrace_graph_caller () at ../arch/arm64/kernel/entry-ftrace.S:182
 Backtrace stopped: previous frame identical to this frame (corrupt stack?)
 (gdb)

Rework so that the kasan implementation isn't traced.

Link: http://lkml.kernel.org/r/20181212183447.15890-1-anders.roxell@linaro.org
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agoinit/Kconfig: fix grammar by moving a closing parenthesis
Jonathan Neuschäfer [Fri, 1 Feb 2019 22:21:01 +0000 (14:21 -0800)]
init/Kconfig: fix grammar by moving a closing parenthesis

Link: http://lkml.kernel.org/r/20190129150813.15785-1-j.neuschaefer@gmx.net
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agolib/test_kmod.c: potential double free in error handling
Dan Carpenter [Fri, 1 Feb 2019 22:20:58 +0000 (14:20 -0800)]
lib/test_kmod.c: potential double free in error handling

There is a copy and paste bug so we set "config->test_driver" to NULL
twice instead of setting "config->test_fs".  Smatch complains that it
leads to a double free:

  lib/test_kmod.c:840 __kmod_config_init() warn: 'config->test_fs' double freed

Link: http://lkml.kernel.org/r/20190121140011.GA14283@kadam
Fixes: d9c6a72d6fa2 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm, oom: fix use-after-free in oom_kill_process
Shakeel Butt [Fri, 1 Feb 2019 22:20:54 +0000 (14:20 -0800)]
mm, oom: fix use-after-free in oom_kill_process

Syzbot instance running on upstream kernel found a use-after-free bug in
oom_kill_process.  On further inspection it seems like the process
selected to be oom-killed has exited even before reaching
read_lock(&tasklist_lock) in oom_kill_process().  More specifically the
tsk->usage is 1 which is due to get_task_struct() in oom_evaluate_task()
and the put_task_struct within for_each_thread() frees the tsk and
for_each_thread() tries to access the tsk.  The easiest fix is to do
get/put across the for_each_thread() on the selected task.

Now the next question is should we continue with the oom-kill as the
previously selected task has exited? However before adding more
complexity and heuristics, let's answer why we even look at the children
of oom-kill selected task? The select_bad_process() has already selected
the worst process in the system/memcg.  Due to race, the selected
process might not be the worst at the kill time but does that matter?
The userspace can use the oom_score_adj interface to prefer children to
be killed before the parent.  I looked at the history but it seems like
this is there before git history.

Link: http://lkml.kernel.org/r/20190121215850.221745-1-shakeelb@google.com
Reported-by: syzbot+7fbbfa368521945f0e3d@syzkaller.appspotmail.com
Fixes: 6b0c81b3be11 ("mm, oom: reduce dependency on tasklist_lock")
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm/hotplug: invalid PFNs from pfn_to_online_page()
Qian Cai [Fri, 1 Feb 2019 22:20:51 +0000 (14:20 -0800)]
mm/hotplug: invalid PFNs from pfn_to_online_page()

On an arm64 ThunderX2 server, the first kmemleak scan would crash [1]
with CONFIG_DEBUG_VM_PGFLAGS=y due to page_to_nid() found a pfn that is
not directly mapped (MEMBLOCK_NOMAP).  Hence, the page->flags is
uninitialized.

This is due to the commit 9f1eb38e0e11 ("mm, kmemleak: little
optimization while scanning") starts to use pfn_to_online_page() instead
of pfn_valid().  However, in the CONFIG_MEMORY_HOTPLUG=y case,
pfn_to_online_page() does not call memblock_is_map_memory() while
pfn_valid() does.

Historically, the commit 68709f45385a ("arm64: only consider memblocks
with NOMAP cleared for linear mapping") causes pages marked as nomap
being no long reassigned to the new zone in memmap_init_zone() by
calling __init_single_page().

Since the commit 2d070eab2e82 ("mm: consider zone which is not fully
populated to have holes") introduced pfn_to_online_page() and was
designed to return a valid pfn only, but it is clearly broken on arm64.

Therefore, let pfn_to_online_page() call pfn_valid_within(), so it can
handle nomap thanks to the commit f52bb98f5ade ("arm64: mm: always
enable CONFIG_HOLES_IN_ZONE"), while it will be optimized away on
architectures where have no HOLES_IN_ZONE.

[1]
  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000006
  Mem abort info:
    ESR = 0x96000005
    Exception class = DABT (current EL), IL = 32 bits
    SET = 0, FnV = 0
    EA = 0, S1PTW = 0
  Data abort info:
    ISV = 0, ISS = 0x00000005
    CM = 0, WnR = 0
  Internal error: Oops: 96000005 [#1] SMP
  CPU: 60 PID: 1408 Comm: kmemleak Not tainted 5.0.0-rc2+ #8
  pstate: 60400009 (nZCv daif +PAN -UAO)
  pc : page_mapping+0x24/0x144
  lr : __dump_page+0x34/0x3dc
  sp : ffff00003a5cfd10
  x29: ffff00003a5cfd10 x28: 000000000000802f
  x27: 0000000000000000 x26: 0000000000277d00
  x25: ffff000010791f56 x24: ffff7fe000000000
  x23: ffff000010772f8b x22: ffff00001125f670
  x21: ffff000011311000 x20: ffff000010772f8b
  x19: fffffffffffffffe x18: 0000000000000000
  x17: 0000000000000000 x16: 0000000000000000
  x15: 0000000000000000 x14: ffff802698b19600
  x13: ffff802698b1a200 x12: ffff802698b16f00
  x11: ffff802698b1a400 x10: 0000000000001400
  x9 : 0000000000000001 x8 : ffff00001121a000
  x7 : 0000000000000000 x6 : ffff0000102c53b8
  x5 : 0000000000000000 x4 : 0000000000000003
  x3 : 0000000000000100 x2 : 0000000000000000
  x1 : ffff000010772f8b x0 : ffffffffffffffff
  Process kmemleak (pid: 1408, stack limit = 0x(____ptrval____))
  Call trace:
   page_mapping+0x24/0x144
   __dump_page+0x34/0x3dc
   dump_page+0x28/0x4c
   kmemleak_scan+0x4ac/0x680
   kmemleak_scan_thread+0xb4/0xdc
   kthread+0x12c/0x13c
   ret_from_fork+0x10/0x18
  Code: d503201f f9400660 36000040 d1000413 (f9400661)
  ---[ end trace 4d4bd7f573490c8e ]---
  Kernel panic - not syncing: Fatal exception
  SMP: stopping secondary CPUs
  Kernel Offset: disabled
  CPU features: 0x002,20000c38
  Memory Limit: none
  ---[ end Kernel panic - not syncing: Fatal exception ]---

Link: http://lkml.kernel.org/r/20190122132916.28360-1-cai@lca.pw
Fixes: 9f1eb38e0e11 ("mm, kmemleak: little optimization while scanning")
Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm,memory_hotplug: fix scan_movable_pages() for gigantic hugepages
Oscar Salvador [Fri, 1 Feb 2019 22:20:47 +0000 (14:20 -0800)]
mm,memory_hotplug: fix scan_movable_pages() for gigantic hugepages

This is the same sort of error we saw in commit 17e2e7d7e1b8 ("mm,
page_alloc: fix has_unmovable_pages for HugePages").

Gigantic hugepages cross several memblocks, so it can be that the page
we get in scan_movable_pages() is a page-tail belonging to a
1G-hugepage.  If that happens, page_hstate()->size_to_hstate() will
return NULL, and we will blow up in hugepage_migration_supported().

The splat is as follows:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  #PF error: [normal kernel read fault]
  PGD 0 P4D 0
  Oops: 0000 [#1] SMP PTI
  CPU: 1 PID: 1350 Comm: bash Tainted: G            E     5.0.0-rc1-mm1-1-default+ #27
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
  RIP: 0010:__offline_pages+0x6ae/0x900
  Call Trace:
   memory_subsys_offline+0x42/0x60
   device_offline+0x80/0xa0
   state_store+0xab/0xc0
   kernfs_fop_write+0x102/0x180
   __vfs_write+0x26/0x190
   vfs_write+0xad/0x1b0
   ksys_write+0x42/0x90
   do_syscall_64+0x5b/0x180
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  Modules linked in: af_packet(E) xt_tcpudp(E) ipt_REJECT(E) xt_conntrack(E) nf_conntrack(E) nf_defrag_ipv4(E) ip_set(E) nfnetlink(E) ebtable_nat(E) ebtable_broute(E) bridge(E) stp(E) llc(E) iptable_mangle(E) iptable_raw(E) iptable_security(E) ebtable_filter(E) ebtables(E) iptable_filter(E) ip_tables(E) x_tables(E) kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) bochs_drm(E) ttm(E) aesni_intel(E) drm_kms_helper(E) aes_x86_64(E) crypto_simd(E) cryptd(E) glue_helper(E) drm(E) virtio_net(E) syscopyarea(E) sysfillrect(E) net_failover(E) sysimgblt(E) pcspkr(E) failover(E) i2c_piix4(E) fb_sys_fops(E) parport_pc(E) parport(E) button(E) btrfs(E) libcrc32c(E) xor(E) zstd_decompress(E) zstd_compress(E) xxhash(E) raid6_pq(E) sd_mod(E) ata_generic(E) ata_piix(E) ahci(E) libahci(E) libata(E) crc32c_intel(E) serio_raw(E) virtio_pci(E) virtio_ring(E) virtio(E) sg(E) scsi_mod(E) autofs4(E)

[akpm@linux-foundation.org: fix brace layout, per David.  Reduce indentation]
Link: http://lkml.kernel.org/r/20190122154407.18417-1-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agopsi: fix aggregation idle shut-off
Johannes Weiner [Fri, 1 Feb 2019 22:20:42 +0000 (14:20 -0800)]
psi: fix aggregation idle shut-off

psi has provisions to shut off the periodic aggregation worker when
there is a period of no task activity - and thus no data that needs
aggregating.  However, while developing psi monitoring, Suren noticed
that the aggregation clock currently won't stay shut off for good.

Debugging this revealed a flaw in the idle design: an aggregation run
will see no task activity and decide to go to sleep; shortly thereafter,
the kworker thread that executed the aggregation will go idle and cause
a scheduling change, during which the psi callback will kick the
!pending worker again.  This will ping-pong forever, and is equivalent
to having no shut-off logic at all (but with more code!)

Fix this by exempting aggregation workers from psi's clock waking logic
when the state change is them going to sleep.  To do this, tag workers
with the last work function they executed, and if in psi we see a worker
going to sleep after aggregating psi data, we will not reschedule the
aggregation work item.

What if the worker is also executing other items before or after?

Any psi state times that were incurred by work items preceding the
aggregation work will have been collected from the per-cpu buckets
during the aggregation itself.  If there are work items following the
aggregation work, the worker's last_func tag will be overwritten and the
aggregator will be kept alive to process this genuine new activity.

If the aggregation work is the last thing the worker does, and we decide
to go idle, the brief period of non-idle time incurred between the
aggregation run and the kworker's dequeue will be stranded in the
per-cpu buckets until the clock is woken by later activity.  But that
should not be a problem.  The buckets can hold 4s worth of time, and
future activity will wake the clock with a 2s delay, giving us 2s worth
of data we can leave behind when disabling aggregation.  If it takes a
worker more than two seconds to go idle after it finishes its last work
item, we likely have bigger problems in the system, and won't notice one
sample that was averaged with a bogus per-CPU weight.

Link: http://lkml.kernel.org/r/20190116193501.1910-1-hannes@cmpxchg.org
Fixes: eb414681d5a0 ("psi: pressure stall information for CPU, memory, and IO")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm, memory_hotplug: test_pages_in_a_zone do not pass the end of zone
Mikhail Zaslonko [Fri, 1 Feb 2019 22:20:38 +0000 (14:20 -0800)]
mm, memory_hotplug: test_pages_in_a_zone do not pass the end of zone

If memory end is not aligned with the sparse memory section boundary,
the mapping of such a section is only partly initialized.  This may lead
to VM_BUG_ON due to uninitialized struct pages access from
test_pages_in_a_zone() function triggered by memory_hotplug sysfs
handlers.

Here are the the panic examples:
 CONFIG_DEBUG_VM_PGFLAGS=y
 kernel parameter mem=2050M
 --------------------------
 page:000003d082008000 is uninitialized and poisoned
 page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p))
 Call Trace:
   test_pages_in_a_zone+0xde/0x160
   show_valid_zones+0x5c/0x190
   dev_attr_show+0x34/0x70
   sysfs_kf_seq_show+0xc8/0x148
   seq_read+0x204/0x480
   __vfs_read+0x32/0x178
   vfs_read+0x82/0x138
   ksys_read+0x5a/0xb0
   system_call+0xdc/0x2d8
 Last Breaking-Event-Address:
   test_pages_in_a_zone+0xde/0x160
 Kernel panic - not syncing: Fatal exception: panic_on_oops

Fix this by checking whether the pfn to check is within the zone.

[mhocko@suse.com: separated this change from http://lkml.kernel.org/r/20181105150401.97287-2-zaslonko@linux.ibm.com]
Link: http://lkml.kernel.org/r/20190128144506.15603-3-mhocko@kernel.org
[mhocko@suse.com: separated this change from
http://lkml.kernel.org/r/20181105150401.97287-2-zaslonko@linux.ibm.com]
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Tested-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agomm, memory_hotplug: is_mem_section_removable do not pass the end of a zone
Michal Hocko [Fri, 1 Feb 2019 22:20:34 +0000 (14:20 -0800)]
mm, memory_hotplug: is_mem_section_removable do not pass the end of a zone

Patch series "mm, memory_hotplug: fix uninitialized pages fallouts", v2.

Mikhail Zaslonko has posted fixes for the two bugs quite some time ago
[1].  I have pushed back on those fixes because I believed that it is
much better to plug the problem at the initialization time rather than
play whack-a-mole all over the hotplug code and find all the places
which expect the full memory section to be initialized.

We have ended up with commit 2830bf6f05fb ("mm, memory_hotplug:
initialize struct pages for the full memory section") merged and cause a
regression [2][3].  The reason is that there might be memory layouts
when two NUMA nodes share the same memory section so the merged fix is
simply incorrect.

In order to plug this hole we really have to be zone range aware in
those handlers.  I have split up the original patch into two.  One is
unchanged (patch 2) and I took a different approach for `removable'
crash.

[1] http://lkml.kernel.org/r/20181105150401.97287-2-zaslonko@linux.ibm.com
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1666948
[3] http://lkml.kernel.org/r/20190125163938.GA20411@dhcp22.suse.cz

This patch (of 2):

Mikhail has reported the following VM_BUG_ON triggered when reading sysfs
removable state of a memory block:

 page:000003d08300c000 is uninitialized and poisoned
 page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p))
 Call Trace:
   is_mem_section_removable+0xb4/0x190
   show_mem_removable+0x9a/0xd8
   dev_attr_show+0x34/0x70
   sysfs_kf_seq_show+0xc8/0x148
   seq_read+0x204/0x480
   __vfs_read+0x32/0x178
   vfs_read+0x82/0x138
   ksys_read+0x5a/0xb0
   system_call+0xdc/0x2d8
 Last Breaking-Event-Address:
   is_mem_section_removable+0xb4/0x190
 Kernel panic - not syncing: Fatal exception: panic_on_oops

The reason is that the memory block spans the zone boundary and we are
stumbling over an unitialized struct page.  Fix this by enforcing zone
range in is_mem_section_removable so that we never run away from a zone.

Link: http://lkml.kernel.org/r/20190128144506.15603-2-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Debugged-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Tested-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
5 years agooom, oom_reaper: do not enqueue same task twice
Tetsuo Handa [Fri, 1 Feb 2019 22:20:31 +0000 (14:20 -0800)]
oom, oom_reaper: do not enqueue same task twice

Arkadiusz reported that enabling memcg's group oom killing causes
strange memcg statistics where there is no task in a memcg despite the
number of tasks in that memcg is not 0.  It turned out that there is a
bug in wake_oom_reaper() which allows enqueuing same task twice which
makes impossible to decrease the number of tasks in that memcg due to a
refcount leak.

This bug existed since the OOM reaper became invokable from
task_will_free_mem(current) path in out_of_memory() in Linux 4.7,

  T1@P1     |T2@P1     |T3@P1     |OOM reaper
  ----------+----------+----------+------------
                                   # Processing an OOM victim in a different memcg domain.
                        try_charge()
                          mem_cgroup_out_of_memory()
                            mutex_lock(&oom_lock)
             try_charge()
               mem_cgroup_out_of_memory()
                 mutex_lock(&oom_lock)
  try_charge()
    mem_cgroup_out_of_memory()
      mutex_lock(&oom_lock)
                            out_of_memory()
                              oom_kill_process(P1)
                                do_send_sig_info(SIGKILL, @P1)
                                mark_oom_victim(T1@P1)
                                wake_oom_reaper(T1@P1) # T1@P1 is enqueued.
                            mutex_unlock(&oom_lock)
                 out_of_memory()
                   mark_oom_victim(T2@P1)
                   wake_oom_reaper(T2@P1) # T2@P1 is enqueued.
                 mutex_unlock(&oom_lock)
      out_of_memory()
        mark_oom_victim(T1@P1)
        wake_oom_reaper(T1@P1) # T1@P1 is enqueued again due to oom_reaper_list == T2@P1 && T1@P1->oom_reaper_list == NULL.
      mutex_unlock(&oom_lock)
                                   # Completed processing an OOM victim in a different memcg domain.
                                   spin_lock(&oom_reaper_lock)
                                   # T1P1 is dequeued.
                                   spin_unlock(&oom_reaper_lock)

but memcg's group oom killing made it easier to trigger this bug by
calling wake_oom_reaper() on the same task from one out_of_memory()
request.

Fix this bug using an approach used by commit 855b018325737f76 ("oom,
oom_reaper: disable oom_reaper for oom_kill_allocating_task").  As a
side effect of this patch, this patch also avoids enqueuing multiple
threads sharing memory via task_will_free_mem(current) path.

Link: http://lkml.kernel.org/r/e865a044-2c10-9858-f4ef-254bc71d6cc2@i-love.sakura.ne.jp
Link: http://lkml.kernel.org/r/5ee34fc6-1485-34f8-8790-903ddabaa809@i-love.sakura.ne.jp
Fixes: af8e15cc85a25315 ("oom, oom_reaper: do not enqueue task if it is on the oom_reaper_list head")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Arkadiusz Miskiewicz <arekm@maven.pl>
Tested-by: Arkadiusz Miskiewicz <arekm@maven.pl>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Aleksa Sarai <asarai@suse.de>
Cc: Jay Kamat <jgkamat@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>