linux-2.6-microblaze.git
9 months agopowerpc/ftrace: Remove nops after the call to ftrace_stub
Naveen N Rao [Fri, 8 Dec 2023 16:30:42 +0000 (22:00 +0530)]
powerpc/ftrace: Remove nops after the call to ftrace_stub

ftrace_stub is within the same CU, so there is no need for a subsequent
nop instruction.

Signed-off-by: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/8ee5ec520e37d5523654bb2cd65a17512fb774e2.1702045299.git.naveen@kernel.org
9 months agopowerpc/ftrace: Fix indentation in ftrace.h
Naveen N Rao [Fri, 8 Dec 2023 16:30:40 +0000 (22:00 +0530)]
powerpc/ftrace: Fix indentation in ftrace.h

Replace seven spaces with a tab character to fix an indentation issue
reported by the kernel test robot.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311221731.alUwTDIm-lkp@intel.com/
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/9f058227bd9243f0842786ef7228d87ab10d29f6.1702045299.git.naveen@kernel.org
9 months agopowerpc/selftests: Add test for papr-sysparm
Nathan Lynch [Tue, 12 Dec 2023 17:02:00 +0000 (11:02 -0600)]
powerpc/selftests: Add test for papr-sysparm

Consistently testing system parameter access is a bit difficult by
nature -- the set of parameters available depends on the model and
system configuration, and updating a parameter should be considered a
destructive operation reserved for the admin.

So we validate some of the error paths and retrieve the SPLPAR
characteristics string, but not much else.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-13-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/selftests: Add test for papr-vpd
Nathan Lynch [Tue, 12 Dec 2023 17:01:59 +0000 (11:01 -0600)]
powerpc/selftests: Add test for papr-vpd

Add selftests for /dev/papr-vpd, exercising the common expected use
cases:

* Retrieve all VPD by passing an empty location code.
* Retrieve the "system VPD" by passing a location code derived from DT
  root node properties, as done by the vpdupdate command.

The tests also verify that certain intended properties of the driver
hold:

* Passing an unterminated location code to PAPR_VPD_CREATE_HANDLE gets
  EINVAL.
* Passing a NULL location code pointer to PAPR_VPD_CREATE_HANDLE gets
  EFAULT.
* Closing the device node without first issuing a
  PAPR_VPD_CREATE_HANDLE command to it succeeds.
* Releasing a handle without first consuming any data from it
  succeeds.
* Re-reading the contents of a handle returns the same data as the
  first time.

Some minimal validation of the returned data is performed.

The tests are skipped on systems where the papr-vpd driver does not
initialize, making this useful only on PowerVM LPARs at this point.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-12-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/pseries/papr-sysparm: Expose character device to user space
Nathan Lynch [Tue, 12 Dec 2023 17:01:58 +0000 (11:01 -0600)]
powerpc/pseries/papr-sysparm: Expose character device to user space

Until now the papr_sysparm APIs have been kernel-internal. But user
space needs access to PAPR system parameters too. The only method
available to user space today to get or set system parameters is using
sys_rtas() and /dev/mem to pass RTAS-addressable buffers between user
space and firmware. This is incompatible with lockdown and should be
deprecated.

So provide an alternative ABI to user space in the form of a
/dev/papr-sysparm character device with just two ioctl commands (get
and set). The data payloads involved are small enough to fit in the
ioctl argument buffer, making the code relatively simple.

Exposing the system parameters through sysfs has been considered but
it would be too awkward:

* The kernel currently does not have to contain an exhaustive list of
  defined system parameters. This is a convenient property to maintain
  because we don't have to update the kernel whenever a new parameter
  is added to PAPR. Exporting a named attribute in sysfs for each
  parameter would negate this.

* Some system parameters are text-based and some are not.

* Retrieval of at least one system parameter requires input data,
  which a simple read-oriented interface can't support.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-11-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/pseries/papr-sysparm: Validate buffer object lengths
Nathan Lynch [Tue, 12 Dec 2023 17:01:57 +0000 (11:01 -0600)]
powerpc/pseries/papr-sysparm: Validate buffer object lengths

The ability to get and set system parameters will be exposed to user
space, so let's get a little more strict about malformed
papr_sysparm_buf objects.

* Create accessors for the length field of struct papr_sysparm_buf.
  The length is always stored in MSB order and this is better than
  spreading the necessary conversions all over.

* Reject attempts to submit invalid buffers to RTAS.

* Warn if RTAS returns a buffer with an invalid length, clamping the
  returned length to a safe value that won't overrun the buffer.

These are meant as precautionary measures to mitigate both firmware
and kernel bugs in this area, should they arise, but I am not aware of
any.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-10-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/pseries: Add papr-vpd character driver for VPD retrieval
Nathan Lynch [Tue, 12 Dec 2023 17:01:56 +0000 (11:01 -0600)]
powerpc/pseries: Add papr-vpd character driver for VPD retrieval

PowerVM LPARs may retrieve Vital Product Data (VPD) for system
components using the ibm,get-vpd RTAS function.

We can expose this to user space with a /dev/papr-vpd character
device, where the programming model is:

  struct papr_location_code plc = { .str = "", }; /* obtain all VPD */
  int devfd = open("/dev/papr-vpd", O_RDONLY);
  int vpdfd = ioctl(devfd, PAPR_VPD_CREATE_HANDLE, &plc);
  size_t size = lseek(vpdfd, 0, SEEK_END);
  char *buf = malloc(size);
  pread(devfd, buf, size, 0);

When a file descriptor is obtained from ioctl(PAPR_VPD_CREATE_HANDLE),
the file contains the result of a complete ibm,get-vpd sequence. The
file contents are immutable from the POV of user space. To get a new
view of the VPD, the client must create a new handle.

This design choice insulates user space from most of the complexities
that ibm,get-vpd brings:

* ibm,get-vpd must be called more than once to obtain complete
  results.

* Only one ibm,get-vpd call sequence should be in progress at a time;
  interleaved sequences will disrupt each other. Callers must have a
  protocol for serializing their use of the function.

* A call sequence in progress may receive a "VPD changed, try again"
  status, requiring the client to abandon the sequence and start
  over.

The memory required for the VPD buffers seems acceptable, around 20KB
for all VPD on one of my systems. And the value of the
/rtas/ibm,vpd-size DT property (the estimated maximum size of VPD) is
consistently 300KB across various systems I've checked.

I've implemented support for this new ABI in the rtas_get_vpd()
function in librtas, which the vpdupdate command currently uses to
populate its VPD database. I've verified that an unmodified vpdupdate
binary generates an identical database when using a librtas.so that
prefers the new ABI.

Along with the papr-vpd.h header exposed to user space, this
introduces a common papr-miscdev.h uapi header to share a base ioctl
ID with similar drivers to come.

Tested-by: Michal Suchánek <msuchanek@suse.de>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-9-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Warn if per-function lock isn't held
Nathan Lynch [Tue, 12 Dec 2023 17:01:55 +0000 (11:01 -0600)]
powerpc/rtas: Warn if per-function lock isn't held

If the function descriptor has a populated lock member, then callers
are required to hold it across calls. Now that the firmware activation
sequence is appropriately guarded, we can warn when the requirement
isn't satisfied.

__do_enter_rtas_trace() gets reorganized a bit as a result of
performing the function descriptor lookup unconditionally now.

Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-8-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Serialize firmware activation sequences
Nathan Lynch [Tue, 12 Dec 2023 17:01:54 +0000 (11:01 -0600)]
powerpc/rtas: Serialize firmware activation sequences

Use rtas_ibm_activate_firmware_lock to prevent interleaving call
sequences of the ibm,activate-firmware RTAS function, which typically
requires multiple calls to complete the update. While the spec does
not specifically prohibit interleaved sequences, there's almost
certainly no advantage to allowing them.

Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-7-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Facilitate high-level call sequences
Nathan Lynch [Tue, 12 Dec 2023 17:01:53 +0000 (11:01 -0600)]
powerpc/rtas: Facilitate high-level call sequences

On RTAS platforms there is a general restriction that the OS must not
enter RTAS on more than one CPU at a time. This low-level
serialization requirement is satisfied by holding a spin
lock (rtas_lock) across most RTAS function invocations.

However, some pseries RTAS functions require multiple successive calls
to complete a logical operation. Beginning a new call sequence for such a
function may disrupt any other sequences of that function already in
progress. Safe and reliable use of these functions effectively
requires higher-level serialization beyond what is already done at the
level of RTAS entry and exit.

Where a sequence-based RTAS function is invoked only through
sys_rtas(), with no in-kernel users, there is no issue as far as the
kernel is concerned. User space is responsible for appropriately
serializing its call sequences. (Whether user space code actually
takes measures to prevent sequence interleaving is another matter.)
Examples of such functions currently include ibm,platform-dump and
ibm,get-vpd.

But where a sequence-based RTAS function has both user space and
in-kernel uesrs, there is a hazard. Even if the in-kernel call sites
of such a function serialize their sequences correctly, a user of
sys_rtas() can invoke the same function at any time, potentially
disrupting a sequence in progress.

So in order to prevent disruption of kernel-based RTAS call sequences,
they must serialize not only with themselves but also with sys_rtas()
users, somehow. Preferably without adding more function-specific hacks
to sys_rtas(). This is a prerequisite for adding an in-kernel call
sequence of ibm,get-vpd, which is in a change to follow.

Note that it has never been feasible for the kernel to prevent
sys_rtas()-based sequences from being disrupted because control
returns to user space on every call. sys_rtas()-based users of these
functions have always been, and continue to be, responsible for
coordinating their call sequences with other users, even those which
may invoke the RTAS functions through less direct means than
sys_rtas(). This is an unavoidable consequence of exposing
sequence-based RTAS functions through sys_rtas().

* Add an optional mutex member to struct rtas_function.

* Statically define a mutex for each RTAS function with known call
  sequence serialization requirements, and assign its address to the
  .lock member of the corresponding function table entry, along with
  justifying commentary.

* In sys_rtas(), if the table entry for the RTAS function being
  called has a populated lock member, acquire it before taking
  rtas_lock and entering RTAS.

* Kernel-based RTAS call sequences are expected to access the
  appropriate mutex explicitly by name. For example, a user of the
  ibm,activate-firmware RTAS function would do:

        int token = rtas_function_token(RTAS_FN_IBM_ACTIVATE_FIRMWARE);
        int fwrc;

        mutex_lock(&rtas_ibm_activate_firmware_lock);

        do {
                fwrc = rtas_call(token, 0, 1, NULL);
        } while (rtas_busy_delay(fwrc));

        mutex_unlock(&rtas_ibm_activate_firmware_lock);

There should be no perceivable change introduced here except that
concurrent callers of the same RTAS function via sys_rtas() may block
on a mutex instead of spinning on rtas_lock.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-6-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Move token validation from block_rtas_call() to sys_rtas()
Nathan Lynch [Tue, 12 Dec 2023 17:01:52 +0000 (11:01 -0600)]
powerpc/rtas: Move token validation from block_rtas_call() to sys_rtas()

The rtas system call handler sys_rtas() delegates certain input
validation steps to a helper function: block_rtas_call(). One of these
steps ensures that the user-supplied token value maps to a known RTAS
function. This is done by performing a "reverse" token-to-function
lookup via rtas_token_to_function_untrusted() to obtain an
rtas_function object.

In changes to come, sys_rtas() itself will need the function
descriptor for the token. To prepare:

* Move the lookup and validation up into sys_rtas() and pass the
  resulting rtas_function pointer to block_rtas_call(), which is
  otherwise unconcerned with the token value.

* Change block_rtas_call() to report the RTAS function name instead of
  the token value on validation failures, since it can now rely on
  having a valid function descriptor.

One behavior change is that sys_rtas() now silently errors out when
passed a bad token, before calling block_rtas_call(). So we will no
longer log "RTAS call blocked - exploit attempt?" on invalid
tokens. This is consistent with how sys_rtas() currently handles other
"metadata" (nargs and nret), while block_rtas_call() is primarily
concerned with validating the arguments to be passed to specific RTAS
functions.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-5-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Add function return status constants
Nathan Lynch [Tue, 12 Dec 2023 17:01:51 +0000 (11:01 -0600)]
powerpc/rtas: Add function return status constants

Not all of the generic RTAS function statuses specified in PAPR have
symbolic constants and descriptions in rtas.h. Fix this, providing a
little more background, slightly updating the existing wording, and
improving the formatting.

Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-4-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Fall back to linear search on failed token->function lookup
Nathan Lynch [Tue, 12 Dec 2023 17:01:50 +0000 (11:01 -0600)]
powerpc/rtas: Fall back to linear search on failed token->function lookup

Enabling any of the powerpc:rtas_* tracepoints at boot is likely to
result in an oops on RTAS platforms. For example, booting a QEMU
pseries model with 'trace_event=powerpc:rtas_input' in the command
line leads to:

  BUG: Kernel NULL pointer dereference on read at 0x00000008
  Oops: Kernel access of bad area, sig: 7 [#1]
  NIP [c00000000004231c] do_enter_rtas+0x1bc/0x460
  LR [c00000000004231c] do_enter_rtas+0x1bc/0x460
  Call Trace:
    do_enter_rtas+0x1bc/0x460 (unreliable)
    rtas_call+0x22c/0x4a0
    rtas_get_boot_time+0x80/0x14c
    read_persistent_clock64+0x124/0x150
    read_persistent_wall_and_boot_offset+0x28/0x58
    timekeeping_init+0x70/0x348
    start_kernel+0xa0c/0xc1c
    start_here_common+0x1c/0x20

(This is preceded by a warning for the failed lookup in
rtas_token_to_function().)

This happens when __do_enter_rtas_trace() attempts a token to function
descriptor lookup before the xarray containing the mappings has been
set up.

Fall back to linear scan of the table if rtas_token_to_function_xarray
is empty.

Fixes: 24098f580e2b ("powerpc/rtas: add tracepoints around RTAS entry")
Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-3-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Add for_each_rtas_function() iterator
Nathan Lynch [Tue, 12 Dec 2023 17:01:49 +0000 (11:01 -0600)]
powerpc/rtas: Add for_each_rtas_function() iterator

Add a convenience macro for iterating over every element of the
internal function table and convert the one site that can use it. An
additional user of the macro is anticipated in changes to follow.

Reviewed-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-2-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/rtas: Avoid warning on invalid token argument to sys_rtas()
Nathan Lynch [Tue, 12 Dec 2023 17:01:48 +0000 (11:01 -0600)]
powerpc/rtas: Avoid warning on invalid token argument to sys_rtas()

rtas_token_to_function() WARNs when passed an invalid token; it's
meant to catch bugs in kernel-based users of RTAS functions. However,
user space controls the token value passed to rtas_token_to_function()
by block_rtas_call(), so user space with sufficient privilege to use
sys_rtas() can trigger the warnings at will:

  unexpected failed lookup for token 2048
  WARNING: CPU: 20 PID: 2247 at arch/powerpc/kernel/rtas.c:556
    rtas_token_to_function+0xfc/0x110
  ...
  NIP rtas_token_to_function+0xfc/0x110
  LR  rtas_token_to_function+0xf8/0x110
  Call Trace:
    rtas_token_to_function+0xf8/0x110 (unreliable)
    sys_rtas+0x188/0x880
    system_call_exception+0x268/0x530
    system_call_common+0x160/0x2c4

It's desirable to continue warning on bogus tokens in
rtas_token_to_function(). Currently it is used to look up RTAS
function descriptors when tracing, where we know there has to have
been a successful descriptor lookup by different means already, and it
would be a serious inconsistency for the reverse lookup to fail.

So instead of weakening rtas_token_to_function()'s contract by
removing the warnings, introduce rtas_token_to_function_untrusted(),
which has no opinion on failed lookups. Convert block_rtas_call() and
rtas_token_to_function() to use it.

Fixes: 8252b88294d2 ("powerpc/rtas: improve function information lookups")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231212-papr-sys_rtas-vs-lockdown-v6-1-e9eafd0c8c6c@linux.ibm.com
9 months agopowerpc/hv-gpci: Add return value check in affinity_domain_via_partition_show function
Kajol Jain [Thu, 16 Nov 2023 12:20:32 +0000 (17:50 +0530)]
powerpc/hv-gpci: Add return value check in affinity_domain_via_partition_show function

To access hv-gpci kernel interface files data, the
"Enable Performance Information Collection" option has to be set
in hmc. Incase that option is not set and user try to read
the interface files, it should give error message as
operation not permitted.

Result of accessing added interface files with disabled
performance collection option:

[command]# cat processor_bus_topology
cat: processor_bus_topology: Operation not permitted

[command]# cat processor_config
cat: processor_config: Operation not permitted

[command]# cat affinity_domain_via_domain
cat: affinity_domain_via_domain: Operation not permitted

[command]# cat affinity_domain_via_virtual_processor
cat: affinity_domain_via_virtual_processor: Operation not permitted

[command]# cat affinity_domain_via_partition

Based on above result there is no error message when reading
affinity_domain_via_partition file because of missing
check for failed hcall. Fix this issue by adding
a check in the start of affinity_domain_via_partition_show
function, to return error incase hcall fails, with error type
other then H_PARAMETER.

Fixes: a15e0d6a6929 ("powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via partition information")
Reported-by: Disha Goel <disgoel@linux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231116122033.160964-1-kjain@linux.ibm.com
9 months agoselftests/powerpc: Check all FPRs in fpu_syscall test
Michael Ellerman [Tue, 28 Nov 2023 13:27:48 +0000 (00:27 +1100)]
selftests/powerpc: Check all FPRs in fpu_syscall test

There is a selftest that checks if FPRs are corrupted across a fork, aka
clone. It was added as part of the series that optimised the clone path
to save the parent's FP state without "giving up" (turning off FP).

See commit 8792468da5e1 ("powerpc: Add the ability to save FPU without
giving it up").

The test encodes the assumption that FPRs 0-13 are volatile across the
syscall, by only checking the volatile FPRs are not changed by the fork.
There was also a comment in the fpu_preempt test alluding to that:

  The check_fpu function in asm only checks the non volatile registers
  as it is reused from the syscall test

It is true that the function call ABI treats f0-f13 as volatile,
however the syscall ABI has since been documented as *not* treating those
registers as volatile. See commit 7b8845a2a2ec ("powerpc/64: Document
the syscall ABI").

So change the test to check all FPRs are not corrupted by the syscall.
Note that this currently fails, because save_fpu() etc. do not restore
f0/vsr0.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231128132748.1990179-5-mpe@ellerman.id.au
9 months agoselftests/powerpc: Run fpu_preempt test for 60 seconds
Michael Ellerman [Tue, 28 Nov 2023 13:27:47 +0000 (00:27 +1100)]
selftests/powerpc: Run fpu_preempt test for 60 seconds

The FPU preempt test only runs for 20 seconds, which is not particularly
long. Run it for 60 seconds to increase the chance of detecting
corruption.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231128132748.1990179-4-mpe@ellerman.id.au
9 months agoselftests/powerpc: Generate better bit patterns for FPU tests
Michael Ellerman [Tue, 28 Nov 2023 13:27:46 +0000 (00:27 +1100)]
selftests/powerpc: Generate better bit patterns for FPU tests

The fpu_preempt test randomly initialises an array of doubles to try and
detect FPU register corruption.

However the values it generates do not occupy the full range of values
possible in the 64-bit double, meaning some partial register corruption
could go undetected.

Without getting too carried away, add some better initialisation to
generate values that occupy more bits.

Sample values before:

  f0             902677510               (raw 0x41cae6e203000000)
  f1             325217596               (raw 0x41b3626d3c000000)
  f2             1856578300              (raw 0x41dbaa48bf000000)
  f3             1247189984              (raw 0x41d295a6f8000000)

And after:

  f0             1.1078153481413311e-09  (raw 0x3e13083932805cc2)
  f1             1.0576648474801922e+17  (raw 0x43777c20eb88c261)
  f2             -6.6245033413594075e-10 (raw 0xbe06c2f989facae9)
  f3             3.0085988827156291e+18  (raw 0x43c4e0585f2df37b)

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231128132748.1990179-3-mpe@ellerman.id.au
9 months agoselftests/powerpc: Check all FPRs in fpu_preempt
Michael Ellerman [Tue, 28 Nov 2023 13:27:45 +0000 (00:27 +1100)]
selftests/powerpc: Check all FPRs in fpu_preempt

There's a selftest that checks FPRs aren't corrupted by preemption, or
just process scheduling. However it only checks the non-volatile FPRs,
meaning corruption of the volatile FPRs could go undetected.

The check_fpu function it calls is used by several other tests, so for
now add a new routine to check all the FPRs. Increase the size of the
array of FPRs to 32, and initialise them all with random values.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231128132748.1990179-2-mpe@ellerman.id.au
9 months agoselftests/powerpc: Fix error handling in FPU/VMX preemption tests
Michael Ellerman [Tue, 28 Nov 2023 13:27:44 +0000 (00:27 +1100)]
selftests/powerpc: Fix error handling in FPU/VMX preemption tests

The FPU & VMX preemption tests do not check for errors returned by the
low-level asm routines, preempt_fpu() / preempt_vsx() respectively.
That means any register corruption detected by the asm routines does not
result in a test failure.

Fix it by returning the return value of the asm routines from the
pthread child routines.

Fixes: e5ab8be68e44 ("selftests/powerpc: Test preservation of FPU and VMX regs across preemption")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231128132748.1990179-1-mpe@ellerman.id.au
9 months agopowerpc/Makefile: Auto detect cross compiler
Michael Ellerman [Wed, 6 Dec 2023 11:55:48 +0000 (22:55 +1100)]
powerpc/Makefile: Auto detect cross compiler

If no cross compiler is specified, try to auto detect one.

Look for various combinations, matching:
  powerpc(64(le)?)?(-unknown)?-linux(-gnu)?-

There are more possibilities, but the above is known to find a compiler
on Fedora and Ubuntu (which use linux-gnu-), and also detects the
kernel.org cross compilers (which use linux-).

This allows cross compiling with simply:

 # Ubuntu
 $ sudo apt install gcc-powerpc-linux-gnu
 # Fedora
 $ sudo dnf install gcc-powerpc64-linux-gnu

 $ make ARCH=powerpc defconfig
 $ make ARCH=powerpc -j 4

Inspired by arch/parisc/Makefile.

Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231206115548.1466874-4-mpe@ellerman.id.au
9 months agopowerpc/Makefile: Default to ppc64le_defconfig when cross building
Michael Ellerman [Wed, 6 Dec 2023 11:55:47 +0000 (22:55 +1100)]
powerpc/Makefile: Default to ppc64le_defconfig when cross building

If the kernel is being cross compiled, there is no information from
uname on which defconfig is most appropriate, so the Makefile defaults
to ppc64.

However these days almost all distros that support powerpc are little
endian, so it's more likely that defaulting to ppc64le_defconfig will
produce something useful for a user.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231206115548.1466874-3-mpe@ellerman.id.au
9 months agopowerpc/vdso: No need to undef powerpc for 64-bit build
Michael Ellerman [Wed, 6 Dec 2023 11:55:46 +0000 (22:55 +1100)]
powerpc/vdso: No need to undef powerpc for 64-bit build

The vdso Makefile adds -U$(ARCH) to CPPFLAGS for the vdso64.lds linker
script. ARCH is always powerpc, so it becomes -Upowerpc, which means
undefine the "powerpc" symbol.

But the 64-bit compiler doesn't define powerpc in the first place,
compare:

  $ gcc-5.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -m32 -E -dM - </dev/null | grep -w powerpc
  #define powerpc 1
  $ gcc-5.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -m64 -E -dM - </dev/null | grep -w powerpc
  $

So there's no need to undefine it for the 64-bit linker script.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231206115548.1466874-2-mpe@ellerman.id.au
9 months agopowerpc/Makefile: Don't use $(ARCH) unnecessarily
Michael Ellerman [Wed, 6 Dec 2023 11:55:45 +0000 (22:55 +1100)]
powerpc/Makefile: Don't use $(ARCH) unnecessarily

There's no need to use $(ARCH) for references to the arch directory in
the source tree, it is always arch/powerpc.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231206115548.1466874-1-mpe@ellerman.id.au
9 months agoMAINTAINERS: powerpc: Transfer PPC83XX to Christophe
Michael Ellerman [Tue, 5 Dec 2023 05:12:39 +0000 (16:12 +1100)]
MAINTAINERS: powerpc: Transfer PPC83XX to Christophe

Christophe volunteered[1] to maintain PPC83XX.

1: https://lore.kernel.org/all/7b1bf4dc-d09d-35b8-f4df-16bf00429b6d@csgroup.eu/

Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Crystal Wood <oss@buserror.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231205051239.737384-1-mpe@ellerman.id.au
9 months agopowerpc/book3s64: Avoid __pte_protnone() check in __pte_flags_need_flush()
Aneesh Kumar K.V (IBM) [Mon, 4 Dec 2023 09:36:38 +0000 (15:06 +0530)]
powerpc/book3s64: Avoid __pte_protnone() check in __pte_flags_need_flush()

This reverts commit 1abce0580b89 ("powerpc/64s: Fix __pte_needs_flush()
false positive warning")

The previous patch dropped the usage of _PAGE_PRIVILEGED with PAGE_NONE.
Hence this check can be dropped.

Signed-off-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231204093638.71503-2-aneesh.kumar@kernel.org
9 months agopowerpc/book3s/hash: Drop _PAGE_PRIVILEGED from PAGE_NONE
Aneesh Kumar K.V (IBM) [Mon, 4 Dec 2023 09:36:37 +0000 (15:06 +0530)]
powerpc/book3s/hash: Drop _PAGE_PRIVILEGED from PAGE_NONE

There used to be a dependency on _PAGE_PRIVILEGED with pte_savedwrite.
But that got dropped by
commit 6a56ccbcf6c6 ("mm/autonuma: use can_change_(pte|pmd)_writable() to replace savedwrite")

With the change in this patch numa fault pte (pte_protnone()) gets mapped as regular user pte
with RWX cleared (no-access) whereas earlier it used to be mapped _PAGE_PRIVILEGED.

Hash fault handling code gets some WARN_ON added in this patch because
those functions are not expected to get called with _PAGE_READ cleared.
commit 18061c17c8ec ("powerpc/mm: Update PROTFAULT handling in the page
fault path") explains the details.

Signed-off-by: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231204093638.71503-1-aneesh.kumar@kernel.org
9 months agopowerpc/pseries/memhp: Log more error conditions in add path
Nathan Lynch [Tue, 14 Nov 2023 17:01:55 +0000 (11:01 -0600)]
powerpc/pseries/memhp: Log more error conditions in add path

When an add operation for multiple LMBs fails, there is currently
little indication from the kernel of what went wrong. Be a little more
verbose about error conditions in the add paths.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231114-pseries-memhp-fixes-v1-3-fb8f2bb7c557@linux.ibm.com
9 months agopowerpc/pseries/memhp: Fix access beyond end of drmem array
Nathan Lynch [Tue, 14 Nov 2023 17:01:53 +0000 (11:01 -0600)]
powerpc/pseries/memhp: Fix access beyond end of drmem array

dlpar_memory_remove_by_index() may access beyond the bounds of the
drmem lmb array when the LMB lookup fails to match an entry with the
given DRC index. When the search fails, the cursor is left pointing to
&drmem_info->lmbs[drmem_info->n_lmbs], which is one element past the
last valid entry in the array. The debug message at the end of the
function then dereferences this pointer:

        pr_debug("Failed to hot-remove memory at %llx\n",
                 lmb->base_addr);

This was found by inspection and confirmed with KASAN:

  pseries-hotplug-mem: Attempting to hot-remove LMB, drc index 1234
  ==================================================================
  BUG: KASAN: slab-out-of-bounds in dlpar_memory+0x298/0x1658
  Read of size 8 at addr c000000364e97fd0 by task bash/949

  dump_stack_lvl+0xa4/0xfc (unreliable)
  print_report+0x214/0x63c
  kasan_report+0x140/0x2e0
  __asan_load8+0xa8/0xe0
  dlpar_memory+0x298/0x1658
  handle_dlpar_errorlog+0x130/0x1d0
  dlpar_store+0x18c/0x3e0
  kobj_attr_store+0x68/0xa0
  sysfs_kf_write+0xc4/0x110
  kernfs_fop_write_iter+0x26c/0x390
  vfs_write+0x2d4/0x4e0
  ksys_write+0xac/0x1a0
  system_call_exception+0x268/0x530
  system_call_vectored_common+0x15c/0x2ec

  Allocated by task 1:
   kasan_save_stack+0x48/0x80
   kasan_set_track+0x34/0x50
   kasan_save_alloc_info+0x34/0x50
   __kasan_kmalloc+0xd0/0x120
   __kmalloc+0x8c/0x320
   kmalloc_array.constprop.0+0x48/0x5c
   drmem_init+0x2a0/0x41c
   do_one_initcall+0xe0/0x5c0
   kernel_init_freeable+0x4ec/0x5a0
   kernel_init+0x30/0x1e0
   ret_from_kernel_user_thread+0x14/0x1c

  The buggy address belongs to the object at c000000364e80000
   which belongs to the cache kmalloc-128k of size 131072
  The buggy address is located 0 bytes to the right of
   allocated 98256-byte region [c000000364e80000c000000364e97fd0)

  ==================================================================
  pseries-hotplug-mem: Failed to hot-remove memory at 0

Log failed lookups with a separate message and dereference the
cursor only when it points to a valid entry.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Fixes: 51925fb3c5c9 ("powerpc/pseries: Implement memory hotplug remove in the kernel")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231114-pseries-memhp-fixes-v1-1-fb8f2bb7c557@linux.ibm.com
9 months agopowerpc/44x: select I2C for CURRITUCK
Randy Dunlap [Fri, 1 Dec 2023 05:51:59 +0000 (21:51 -0800)]
powerpc/44x: select I2C for CURRITUCK

Fix build errors when CURRITUCK=y and I2C is not builtin (=m or is
not set). Fixes these build errors:

powerpc-linux-ld: arch/powerpc/platforms/44x/ppc476.o: in function `avr_halt_system':
ppc476.c:(.text+0x58): undefined reference to `i2c_smbus_write_byte_data'
powerpc-linux-ld: arch/powerpc/platforms/44x/ppc476.o: in function `ppc47x_device_probe':
ppc476.c:(.init.text+0x18): undefined reference to `i2c_register_driver'

Fixes: 2a2c74b2efcb ("IBM Akebono: Add the Akebono platform")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Closes: lore.kernel.org/r/202312010820.cmdwF5X9-lkp@intel.com
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231201055159.8371-1-rdunlap@infradead.org
9 months agopowerpc/85xx: Fix typo in code comment
Dario Binacchi [Fri, 24 Nov 2023 10:02:37 +0000 (11:02 +0100)]
powerpc/85xx: Fix typo in code comment

s/singals/signals/

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231124100241.660374-1-dario.binacchi@amarulasolutions.com
9 months agopowerpc: Add PVN support for HeXin C2000 processor
Zhao Ke [Wed, 29 Nov 2023 07:58:45 +0000 (15:58 +0800)]
powerpc: Add PVN support for HeXin C2000 processor

HeXin Tech Co. has applied for a new PVN from the OpenPower Community
for its new processor C2000. The OpenPower has assigned a new PVN
and this newly assigned PVN is 0x0066, add pvr register related
support for this PVN.

Signed-off-by: Zhao Ke <ke.zhao@shingroup.cn>
Link: https://discuss.openpower.foundation/t/how-to-get-a-new-pvr-for-processors-follow-power-isa/477/10
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129075845.57976-1-ke.zhao@shingroup.cn
9 months agopowerpc: Fix build error due to is_valid_bugaddr()
Michael Ellerman [Thu, 30 Nov 2023 11:44:33 +0000 (22:44 +1100)]
powerpc: Fix build error due to is_valid_bugaddr()

With CONFIG_GENERIC_BUG=n the build fails with:

  arch/powerpc/kernel/traps.c:1442:5: error: no previous prototype for ‘is_valid_bugaddr’ [-Werror=missing-prototypes]
  1442 | int is_valid_bugaddr(unsigned long addr)
       |     ^~~~~~~~~~~~~~~~

The prototype is only defined, and the function is only needed, when
CONFIG_GENERIC_BUG=y, so move the implementation under that.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231130114433.3053544-2-mpe@ellerman.id.au
9 months agopowerpc/mm: Fix build failures due to arch_reserved_kernel_pages()
Michael Ellerman [Thu, 30 Nov 2023 11:44:32 +0000 (22:44 +1100)]
powerpc/mm: Fix build failures due to arch_reserved_kernel_pages()

With NUMA=n and FA_DUMP=y or PRESERVE_FA_DUMP=y the build fails with:

  arch/powerpc/kernel/fadump.c:1739:22: error: no previous prototype for ‘arch_reserved_kernel_pages’ [-Werror=missing-prototypes]
  1739 | unsigned long __init arch_reserved_kernel_pages(void)
       |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~

The prototype for arch_reserved_kernel_pages() is in include/linux/mm.h,
but it's guarded by __HAVE_ARCH_RESERVED_KERNEL_PAGES. The powerpc
headers define __HAVE_ARCH_RESERVED_KERNEL_PAGES in asm/mmzone.h, which
is not included into the generic headers when NUMA=n.

Move the definition of __HAVE_ARCH_RESERVED_KERNEL_PAGES into asm/mmu.h
which is included regardless of NUMA=n.

Additionally the ifdef around __HAVE_ARCH_RESERVED_KERNEL_PAGES needs to
also check for CONFIG_PRESERVE_FA_DUMP.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231130114433.3053544-1-mpe@ellerman.id.au
9 months agopowerpc/64s: Fix CONFIG_NUMA=n build due to create_section_mapping()
Michael Ellerman [Wed, 29 Nov 2023 13:19:19 +0000 (00:19 +1100)]
powerpc/64s: Fix CONFIG_NUMA=n build due to create_section_mapping()

With CONFIG_NUMA=n the build fails with:

  arch/powerpc/mm/book3s64/pgtable.c:275:15: error: no previous prototype for ‘create_section_mapping’ [-Werror=missing-prototypes]
  275 | int __meminit create_section_mapping(unsigned long start, unsigned long end,
      |               ^~~~~~~~~~~~~~~~~~~~~~

That happens because the prototype for create_section_mapping() is in
asm/mmzone.h, but asm/mmzone.h is only included by linux/mmzone.h
when CONFIG_NUMA=y.

In fact the prototype is only needed by arch/powerpc/mm code, so move
the prototype into arch/powerpc/mm/mmu_decl.h, which also fixes the
build error.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-5-mpe@ellerman.id.au
10 months agopowerpc/44x: Make ppc44x_idle_init() static
Michael Ellerman [Wed, 29 Nov 2023 13:19:18 +0000 (00:19 +1100)]
powerpc/44x: Make ppc44x_idle_init() static

The 44x/fsp2_defconfig build fails with:

  arch/powerpc/platforms/44x/idle.c:30:12: error: no previous prototype for ‘ppc44x_idle_init’ [-Werror=missing-prototypes]
  30 | int __init ppc44x_idle_init(void)
     |            ^~~~~~~~~~~~~~~~

Fix it by making ppc44x_idle_init() static.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-4-mpe@ellerman.id.au
10 months agopowerpc/512x: Fix missing prototype warnings
Michael Ellerman [Wed, 29 Nov 2023 13:19:17 +0000 (00:19 +1100)]
powerpc/512x: Fix missing prototype warnings

The mpc512x_defconfig build fails with:

  arch/powerpc/platforms/512x/mpc5121_ads_cpld.c:142:1: error: no previous prototype for ‘mpc5121_ads_cpld_map’ [-Werror=missing-prototypes]
  142 | mpc5121_ads_cpld_map(void)
      | ^~~~~~~~~~~~~~~~~~~~
  arch/powerpc/platforms/512x/mpc5121_ads_cpld.c:157:1: error: no previous prototype for ‘mpc5121_ads_cpld_pic_init’ [-Werror=missing-prototypes]
  157 | mpc5121_ads_cpld_pic_init(void)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~

There are prototypes for these functions but the header they are in is
not included by mpc5121_ads_cpld.c. Include it to fix the build error.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-3-mpe@ellerman.id.au
10 months agopowerpc/512x: Make pdm360ng_init() static
Michael Ellerman [Wed, 29 Nov 2023 13:19:16 +0000 (00:19 +1100)]
powerpc/512x: Make pdm360ng_init() static

The mpc512x_defconfig config fails with:

  arch/powerpc/platforms/512x/pdm360ng.c:104:13: error: no previous prototype for ‘pdm360ng_init’ [-Werror=missing-prototypes]
  104 | void __init pdm360ng_init(void)
      |             ^~~~~~~~~~~~~

Fix it by making pdm360ng_init() static.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-2-mpe@ellerman.id.au
10 months agopowerpc/suspend: Add prototype for do_after_copyback()
Michael Ellerman [Wed, 29 Nov 2023 13:19:15 +0000 (00:19 +1100)]
powerpc/suspend: Add prototype for do_after_copyback()

With HIBERNATION=y the build breaks with:

  arch/powerpc/kernel/swsusp_64.c:14:6: error: no previous prototype for ‘do_after_copyback’ [-Werror=missing-prototypes]
  14 | void do_after_copyback(void)
     |      ^~~~~~~~~~~~~~~~~

do_after_copyback() is only called from asm, so there is no prototype,
nor any header where it makes sense to place one. Just add a prototype
in the C file to fix the build error.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231129131919.2528517-1-mpe@ellerman.id.au
10 months agopowerpc/rtas_pci: rename and properly expose config access APIs
Nathan Lynch [Tue, 28 Nov 2023 00:40:09 +0000 (18:40 -0600)]
powerpc/rtas_pci: rename and properly expose config access APIs

The rtas_read_config() and rtas_write_config() functions in
kernel/rtas_pci.c have external linkage and two users in arch/powerpc:
the rtas_pci code itself and the pseries platform's "enhanced error
handling" (EEH) support code.

The prototypes for these functions in asm/ppc-pci.h have until now
been guarded by CONFIG_EEH since the only external caller is the
pseries EEH code. However, this presumably has always generated
warnings when built with !CONFIG_EEH and -Wmissing-prototypes:

  arch/powerpc/kernel/rtas_pci.c:46:5: error: no previous prototype for
  function 'rtas_read_config' [-Werror,-Wmissing-prototypes]
     46 | int rtas_read_config(struct pci_dn *pdn, int where,
                               int size, u32 *val)

  arch/powerpc/kernel/rtas_pci.c:98:5: error: no previous prototype for
  function 'rtas_write_config' [-Werror,-Wmissing-prototypes]
     98 | int rtas_write_config(struct pci_dn *pdn, int where,
                                int size, u32 val)

The introduction of commit c6345dfa6e3e ("Makefile.extrawarn: turn on
missing-prototypes globally") forces the issue.

The efika and chrp platform code have (static) functions with the same
names but different signatures. We may as well eliminate the potential
for conflicts and confusion by renaming the globally visible versions
as their prototypes get moved out of the CONFIG_EEH-guarded region;
their current names are too generic anyway. Since they operate on
objects of the type 'struct pci_dn *', give them the slightly more
verbose prefix "rtas_pci_dn_" and fix up all the call sites.

Fixes: c6345dfa6e3e ("Makefile.extrawarn: turn on missing-prototypes globally")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/linuxppc-dev/CA+G9fYt0LLXtjSz+Hkf3Fhm-kf0ZQanrhUS+zVZGa3O+Wt2+vg@mail.gmail.com/
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231127-rtas-pci-rw-config-v1-1-385d29ace3df@linux.ibm.com
10 months agopowerpc: pmd_move_must_withdraw() is only needed for CONFIG_TRANSPARENT_HUGEPAGE
Stephen Rothwell [Mon, 27 Nov 2023 02:28:09 +0000 (13:28 +1100)]
powerpc: pmd_move_must_withdraw() is only needed for CONFIG_TRANSPARENT_HUGEPAGE

The linux-next build of powerpc64 allnoconfig fails with:

  arch/powerpc/mm/book3s64/pgtable.c:557:5: error: no previous prototype for 'pmd_move_must_withdraw'
    557 | int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
        |     ^~~~~~~~~~~~~~~~~~~~~~

Caused by commit:

  c6345dfa6e3e ("Makefile.extrawarn: turn on missing-prototypes globally")

Fix it by moving the function definition under
CONFIG_TRANSPARENT_HUGEPAGE like the prototype. The function is only
called when CONFIG_TRANSPARENT_HUGEPAGE=y.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
[mpe: Flesh out change log from linux-next patch]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231127132809.45c2b398@canb.auug.org.au
10 months agopowerpc/lib: Validate size for vector operations
Naveen N Rao [Thu, 23 Nov 2023 07:17:05 +0000 (12:47 +0530)]
powerpc/lib: Validate size for vector operations

Some of the fp/vmx code in sstep.c assume a certain maximum size for the
instructions being emulated. The size of those operations however is
determined separately in analyse_instr().

Add a check to validate the assumption on the maximum size of the
operations, so as to prevent any unintended kernel stack corruption.

Signed-off-by: Naveen N Rao <naveen@kernel.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Build-tested-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231123071705.397625-1-naveen@kernel.org
10 months agopowerpc/lib: Avoid array bounds warnings in vec ops
Michael Ellerman [Mon, 20 Nov 2023 23:54:36 +0000 (10:54 +1100)]
powerpc/lib: Avoid array bounds warnings in vec ops

Building with GCC with -Warray-bounds enabled there are several warnings
in sstep.c along the lines of:

  In function ‘do_byte_reverse’,
      inlined from ‘do_vec_load’ at arch/powerpc/lib/sstep.c:691:3,
      inlined from ‘emulate_loadstore’ at arch/powerpc/lib/sstep.c:3439:9:
  arch/powerpc/lib/sstep.c:289:23: error: array subscript 2 is outside array bounds of ‘u8[16]’ {aka ‘unsigned char[16]’} [-Werror=array-bounds=]
    289 |                 up[2] = byterev_8(up[1]);
        |                 ~~~~~~^~~~~~~~~~~~~~~~~~
  arch/powerpc/lib/sstep.c: In function ‘emulate_loadstore’:
  arch/powerpc/lib/sstep.c:681:11: note: at offset 16 into object ‘u’ of size 16
    681 |         } u = {};
        |           ^

do_byte_reverse() supports a size up to 32 bytes, but in these cases the
caller is only passing a 16 byte buffer. In practice there is no bug,
do_vec_load() is only called from the LOAD_VMX case in emulate_loadstore().
That in turn is only reached when analyse_instr() recognises VMX ops,
and in all cases the size is no greater than 16:

  $ git grep -w LOAD_VMX arch/powerpc/lib/sstep.c
  arch/powerpc/lib/sstep.c:                        op->type = MKOP(LOAD_VMX, 0, 1);
  arch/powerpc/lib/sstep.c:                        op->type = MKOP(LOAD_VMX, 0, 2);
  arch/powerpc/lib/sstep.c:                        op->type = MKOP(LOAD_VMX, 0, 4);
  arch/powerpc/lib/sstep.c:                        op->type = MKOP(LOAD_VMX, 0, 16);

Similarly for do_vec_store().

Although the warning is incorrect, the code would be safer if it clamped
the size from the caller to the known size of the buffer. Do that using
min_t().

Reported-by: Bagas Sanjaya <bagasdotme@gmail.com>
Closes: https://lore.kernel.org/linuxppc-dev/YpbUcPrm61RLIiZF@debian.me/
Reported-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Closes: https://lore.kernel.org/linuxppc-dev/20221212215117.aa7255t7qd6yefk4@lug-owl.de/
Reported-by: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Closes: https://lore.kernel.org/linuxppc-dev/6a8bf78c-aedb-4d5a-b0aa-82a51a17b884@embeddedor.com/
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Build-tested-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231120235436.1569255-1-mpe@ellerman.id.au
10 months agopowerpc/xics: Check return value of kasprintf in icp_native_map_one_cpu
Kunwu Chan [Wed, 22 Nov 2023 03:06:51 +0000 (11:06 +0800)]
powerpc/xics: Check return value of kasprintf in icp_native_map_one_cpu

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.

Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231122030651.3818-1-chentao@kylinos.cn
10 months agopowerpc: add crtsavres.o to always-y instead of extra-y
Masahiro Yamada [Mon, 20 Nov 2023 23:23:32 +0000 (08:23 +0900)]
powerpc: add crtsavres.o to always-y instead of extra-y

crtsavres.o is linked to modules. However, as explained in commit
d0e628cd817f ("kbuild: doc: clarify the difference between extra-y
and always-y"), 'make modules' does not build extra-y.

For example, the following command fails:

  $ make ARCH=powerpc LLVM=1 KBUILD_MODPOST_WARN=1 mrproper ps3_defconfig modules
    [snip]
    LD [M]  arch/powerpc/platforms/cell/spufs/spufs.ko
  ld.lld: error: cannot open arch/powerpc/lib/crtsavres.o: No such file or directory
  make[3]: *** [scripts/Makefile.modfinal:56: arch/powerpc/platforms/cell/spufs/spufs.ko] Error 1
  make[2]: *** [Makefile:1844: modules] Error 2
  make[1]: *** [/home/masahiro/workspace/linux-kbuild/Makefile:350: __build_one_by_one] Error 2
  make: *** [Makefile:234: __sub-make] Error 2

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Fixes: baa25b571a16 ("powerpc/64: Do not link crtsavres.o in vmlinux")
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231120232332.4100288-1-masahiroy@kernel.org
10 months agopowerpc/32: Drop unused grackle_set_stg()
Michael Ellerman [Mon, 13 Nov 2023 05:19:29 +0000 (16:19 +1100)]
powerpc/32: Drop unused grackle_set_stg()

The call to grackle_set_stg() ("Store Gathering") has always been inside
an #ifdef 0, since the code was first merged in v2.3.43pre7.

Apparently it was suspected of causing problems on some hardware so was
disabled. No one has ever proved otherwise so drop the code as unused
for now.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Bjorn Helgaas <helgaas@kernel.org>
Closes: https://lore.kernel.org/all/20231031145600.GA9161@bhelgaas/
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113051929.1952351-1-mpe@ellerman.id.au
10 months agopowerpc: Remove orphaned reg_a2.h
Michael Ellerman [Mon, 13 Nov 2023 04:39:47 +0000 (15:39 +1100)]
powerpc: Remove orphaned reg_a2.h

Commit fb5a515704d7 ("powerpc: Remove platforms/wsp and associated
pieces") removed the A2 CPU support, but missed removal of reg_a2.h.

None of the defines contained in it are used, with the exception of the
SPRN_TEN* values, but they are also defined in reg_booke.h.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113043947.1931831-1-mpe@ellerman.id.au
10 months agopowerpc: Make cpu_spec __ro_after_init
Michael Ellerman [Wed, 25 Oct 2023 01:24:52 +0000 (12:24 +1100)]
powerpc: Make cpu_spec __ro_after_init

The cpu_spec is a struct holding various information about the CPU the
kernel is executing on. It's populated early in boot and must not change
after that.

In particular the cpu_features and mmu_features hold the set of
discovered CPU/MMU features and are used to set static keys for each
feature, and do binary patching of assembly. So any change to the
cpu_features/mmu_features later in boot will not be reflected in
the state of the static keys or patched code.

There is already logic to check that cpu_features/mmu_features don't
change, see check_features() in feature-fixups.c.

But as another layer of protection the entire cpu_spec should be read
only after init, annotate it as such.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231025012452.1985680-1-mpe@ellerman.id.au
10 months agopowerpc/configs/64s: Enable CONFIG_MEM_SOFT_DIRTY
Michael Ellerman [Tue, 24 Oct 2023 11:27:25 +0000 (22:27 +1100)]
powerpc/configs/64s: Enable CONFIG_MEM_SOFT_DIRTY

Enable CONFIG_MEM_SOFT_DIRTY to get some test coverage. Distros enable
it, and it has been broken previously. See commit 66b2ca086210
("powerpc/64s/radix: Fix soft dirty tracking").

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231024112726.1819795-1-mpe@ellerman.id.au
10 months agomisc: ocxl: main: Remove unnecessary ‘0’ values from rc
Li kunyu [Mon, 13 Nov 2023 01:52:29 +0000 (09:52 +0800)]
misc: ocxl: main: Remove unnecessary ‘0’ values from rc

rc is assigned first, so it does not need to initialize the assignment.

Signed-off-by: Li kunyu <kunyu@nfschina.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113015229.12074-1-kunyu@nfschina.com
10 months agomisc: ocxl: link: Remove unnecessary (void*) conversions
Li zeming [Mon, 13 Nov 2023 01:45:33 +0000 (09:45 +0800)]
misc: ocxl: link: Remove unnecessary (void*) conversions

The link pointer does not need to cast the type.

Signed-off-by: Li zeming <zeming@nfschina.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113014533.11064-1-zeming@nfschina.com
10 months agomisc: ocxl: afu_irq: Remove unnecessary (void*) conversions
Li zeming [Mon, 13 Nov 2023 01:22:02 +0000 (09:22 +0800)]
misc: ocxl: afu_irq: Remove unnecessary (void*) conversions

The irq pointer does not need to cast the type.

Signed-off-by: Li zeming <zeming@nfschina.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113012202.7887-1-zeming@nfschina.com
10 months agomisc: ocxl: context: Remove unnecessary (void*) conversions
Li zeming [Mon, 13 Nov 2023 01:15:43 +0000 (09:15 +0800)]
misc: ocxl: context: Remove unnecessary (void*) conversions

The ctx pointer does not need to cast the type.

Signed-off-by: Li zeming <zeming@nfschina.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231113011543.6940-1-zeming@nfschina.com
10 months agopowerpc/rtas: Remove 'extern' from function declarations in rtas.h
Nathan Lynch [Mon, 6 Nov 2023 13:42:59 +0000 (07:42 -0600)]
powerpc/rtas: Remove 'extern' from function declarations in rtas.h

This header occasionally gains new function declarations without the
leading extern in accordance with current style rules. Leaving the
legacy externs in place is making the header more difficult to read
over time because of the inconsistency. Remove them.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
[mpe: Add names to rtas_call() parameters]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-7-61847655c51f@linux.ibm.com
10 months agopowerpc/rtas: Remove trailing space
Nathan Lynch [Mon, 6 Nov 2023 13:42:58 +0000 (07:42 -0600)]
powerpc/rtas: Remove trailing space

Use scripts/cleanfile to remove instances of trailing space in the
core RTAS code and header.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-6-61847655c51f@linux.ibm.com
10 months agopowerpc/rtas: Move post_mobility_fixup() declaration to pseries
Nathan Lynch [Mon, 6 Nov 2023 13:42:57 +0000 (07:42 -0600)]
powerpc/rtas: Move post_mobility_fixup() declaration to pseries

This is a pseries-specific function declaration that doesn't belong in
rtas.h. Move it to the pseries platform code and adjust
pseries/suspend.c accordingly.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-5-61847655c51f@linux.ibm.com
10 months agopowerpc/rtas: Remove unused rtas_service_present()
Nathan Lynch [Mon, 6 Nov 2023 13:42:56 +0000 (07:42 -0600)]
powerpc/rtas: Remove unused rtas_service_present()

rtas_service_present() has no more users.

rtas_function_implemented() is now the appropriate API for determining
whether a given RTAS function is available to call.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-4-61847655c51f@linux.ibm.com
10 months agopowerpc/rtas: Drop declaration of undefined call_rtas() function
Nathan Lynch [Mon, 6 Nov 2023 13:42:55 +0000 (07:42 -0600)]
powerpc/rtas: Drop declaration of undefined call_rtas() function

The call_rtas() function has never been a part of arch/powerpc, and
its implementation was removed from arch/ppc by 0a26b1364f14 ("ppc:
Remove CHRP, POWER3 and POWER4 support from arch/ppc").

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231106-rtas-trivial-v1-3-61847655c51f@linux.ibm.com
10 months agopowerpc/powermac: mark smp_psurge_{give,take}_timebase static
Arnd Bergmann [Wed, 8 Nov 2023 12:58:40 +0000 (13:58 +0100)]
powerpc/powermac: mark smp_psurge_{give,take}_timebase static

These functions are only called locally and should be static like the
other corresponding functions are:

arch/powerpc/platforms/powermac/smp.c:416:13: error: no previous prototype for 'smp_psurge_take_timebase' [-Werror=missing-prototypes]
  416 | void __init smp_psurge_take_timebase(void)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/powermac/smp.c:432:13: error: no previous prototype for 'smp_psurge_give_timebase' [-Werror=missing-prototypes]
  432 | void __init smp_psurge_give_timebase(void)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231108125843.3806765-20-arnd@kernel.org
10 months agopowerpc/pasemi: mark pas_shutdown() static
Arnd Bergmann [Wed, 8 Nov 2023 12:58:39 +0000 (13:58 +0100)]
powerpc/pasemi: mark pas_shutdown() static

Allmodconfig builds show a warning about one function that is accidentally
marked global:

arch/powerpc/platforms/pasemi/setup.c:67:6: error: no previous prototype for 'pas_shutdown' [-Werror=missing-prototypes]

Fixes: 656fdf3ad8e0 ("powerpc/pasemi: Add Nemo board device init code.")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231108125843.3806765-19-arnd@kernel.org
10 months agopowerpc/ps3: move udbg_shutdown_ps3gelic prototype
Arnd Bergmann [Wed, 8 Nov 2023 12:58:38 +0000 (13:58 +0100)]
powerpc/ps3: move udbg_shutdown_ps3gelic prototype

Allmodconfig kernels produce a missing-prototypes warning:

arch/powerpc/platforms/ps3/gelic_udbg.c:239:6: error: no previous prototype for 'udbg_shutdown_ps3gelic' [-Werror=missing-prototypes]

Move the declaration from a local header to asm/ps3.h where it can be
seen from both the caller and the definition.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Jakub Kicinski <kuba@kernel.org>
[mpe: Drop CONFIG_PS3GELIC_UDBG to fix build error]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231108125843.3806765-18-arnd@kernel.org
10 months agoLinux 6.7-rc2
Linus Torvalds [Sun, 19 Nov 2023 23:02:14 +0000 (15:02 -0800)]
Linux 6.7-rc2

10 months agoMerge tag 'kbuild-fixes-v6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahi...
Linus Torvalds [Sun, 19 Nov 2023 21:54:28 +0000 (13:54 -0800)]
Merge tag 'kbuild-fixes-v6.7' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Fix section mismatch warning messages for riscv and loongarch

 - Remove CONFIG_IA64 left-over from linux/export-internal.h

 - Fix the location of the quotes for UIMAGE_NAME

 - Fix a memory leak bug in Kconfig

* tag 'kbuild-fixes-v6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kconfig: fix memory leak from range properties
  kbuild: Move the single quotes for image name
  linux/export: clean up the IA-64 KSYM_FUNC macro
  modpost: fix section mismatch message for RELA

10 months agoMerge tag 'irq_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:49:32 +0000 (13:49 -0800)]
Merge tag 'irq_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull irq fix from Borislav Petkov:

 - Flush the translation service tables to prevent unpredictable
   behavior on non-coherent GIC devices

* tag 'irq_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3-its: Flush ITS tables correctly in non-coherent GIC designs

10 months agoMerge tag 'x86_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:46:17 +0000 (13:46 -0800)]
Merge tag 'x86_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Ignore invalid x2APIC entries in order to not waste per-CPU data

 - Fix a back-to-back signals handling scenario when shadow stack is in
   use

 - A documentation fix

 - Add Kirill as TDX maintainer

* tag 'x86_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/acpi: Ignore invalid x2APIC entries
  x86/shstk: Delay signal entry SSP write until after user accesses
  x86/Documentation: Indent 'note::' directive for protocol version number note
  MAINTAINERS: Add Intel TDX entry

10 months agoMerge tag 'timers_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:35:07 +0000 (13:35 -0800)]
Merge tag 'timers_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull timer fix from Borislav Petkov:

 - Do the push of pending hrtimers away from a CPU which is being
   offlined earlier in the offlining process in order to prevent a
   deadlock

* tag 'timers_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  hrtimers: Push pending hrtimers away from outgoing CPU earlier

10 months agoMerge tag 'sched_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:32:00 +0000 (13:32 -0800)]
Merge tag 'sched_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Borislav Petkov:

 - Fix virtual runtime calculation when recomputing a sched entity's
   weights

 - Fix wrongly rejected unprivileged poll requests to the cgroup psi
   pressure files

 - Make sure the load balancing is done by only one CPU

* tag 'sched_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix the decision for load balance
  sched: psi: fix unprivileged polling against cgroups
  sched/eevdf: Fix vruntime adjustment on reweight

10 months agoMerge tag 'locking_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:30:21 +0000 (13:30 -0800)]
Merge tag 'locking_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull locking fix from Borislav Petkov:

 - Fix a hardcoded futex flags case which lead to one robust futex test
   failure

* tag 'locking_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  futex: Fix hardcoded flags

10 months agoMerge tag 'perf_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 19 Nov 2023 21:26:42 +0000 (13:26 -0800)]
Merge tag 'perf_urgent_for_v6.7_rc2' of git://git./linux/kernel/git/tip/tip

Pull perf fix from Borislav Petkov:

 - Make sure the context refcount is transferred too when migrating perf
   events

* tag 'perf_urgent_for_v6.7_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix cpuctx refcounting

10 months agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 18 Nov 2023 23:20:58 +0000 (15:20 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Seven small fixes, six in drivers and one in sd.

  The sd fix is so large because it changes a struct pointer to a struct
  but otherwise is fairly simple"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: ufs: qcom-ufs: dt-bindings: Document the SM8650 UFS Controller
  scsi: sd: Fix sshdr use in sd_suspend_common()
  scsi: scsi_debug: Delete some bogus error checking
  scsi: scsi_debug: Fix some bugs in sdebug_error_write()
  scsi: ufs: core: Fix racing issue between ufshcd_mcq_abort() and ISR
  scsi: ufs: core: Expand MCQ queue slot to DeviceQueueDepth + 1
  scsi: qla2xxx: Fix system crash due to bad pointer access

10 months agoMerge tag 'parisc-for-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/delle...
Linus Torvalds [Sat, 18 Nov 2023 23:13:10 +0000 (15:13 -0800)]
Merge tag 'parisc-for-6.7-rc2' of git://git./linux/kernel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:
 "On parisc we still sometimes need writeable stacks, e.g. if programs
  aren't compiled with gcc-14. To avoid issues with the upcoming
  systemd-254 we therefore have to disable prctl(PR_SET_MDWE) for now
  (for parisc only).

  The other two patches are minor: a bugfix for the soft power-off on
  qemu with 64-bit kernel and prefer strscpy() over strlcpy():

   - Fix power soft-off on qemu

   - Disable prctl(PR_SET_MDWE) since parisc sometimes still needs
     writeable stacks

   - Use strscpy instead of strlcpy in show_cpuinfo()"

* tag 'parisc-for-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  prctl: Disable prctl(PR_SET_MDWE) on parisc
  parisc/power: Fix power soft-off when running on qemu
  parisc: Replace strlcpy() with strscpy()

10 months agoMerge tag 'xfs-6.7-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Sat, 18 Nov 2023 19:28:28 +0000 (11:28 -0800)]
Merge tag 'xfs-6.7-fixes-1' of git://git./fs/xfs/xfs-linux

Pull xfs fixes from Chandan Babu:

 - Fix deadlock arising due to intent items in AIL not being cleared
   when log recovery fails

 - Fix stale data exposure bug when remapping COW fork extents to data
   fork

 - Fix deadlock when data device flush fails

 - Fix AGFL minimum size calculation

 - Select DEBUG_FS instead of XFS_DEBUG when XFS_ONLINE_SCRUB_STATS is
   selected

 - Fix corruption of log inode's extent count field when NREXT64 feature
   is enabled

* tag 'xfs-6.7-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: recovery should not clear di_flushiter unconditionally
  xfs: inode recovery does not validate the recovered inode
  xfs: fix again select in kconfig XFS_ONLINE_SCRUB_STATS
  xfs: fix internal error from AGFL exhaustion
  xfs: up(ic_sema) if flushing data device fails
  xfs: only remap the written blocks in xfs_reflink_end_cow_extent
  XFS: Update MAINTAINERS to catch all XFS documentation
  xfs: abort intent items when recovery intents fail
  xfs: factor out xfs_defer_pending_abort

10 months agoMerge tag 'nfsd-6.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Linus Torvalds [Sat, 18 Nov 2023 19:23:32 +0000 (11:23 -0800)]
Merge tag 'nfsd-6.7-1' of git://git./linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Fix several long-standing bugs in the duplicate reply cache

 - Fix a memory leak

* tag 'nfsd-6.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  NFSD: Fix checksum mismatches in the duplicate reply cache
  NFSD: Fix "start of NFS reply" pointer passed to nfsd_cache_update()
  NFSD: Update nfsd_cache_append() to use xdr_stream
  nfsd: fix file memleak on client_opens_release

10 months agoMerge tag '6.7-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Sat, 18 Nov 2023 19:18:46 +0000 (11:18 -0800)]
Merge tag '6.7-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - multichannel fixes (including a lock ordering fix and an important
   refcounting fix)

 - spnego fix

* tag '6.7-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix lock ordering while disabling multichannel
  cifs: fix leak of iface for primary channel
  cifs: fix check of rc in function generate_smb3signingkey
  cifs: spnego: add ';' in HOST_KEY_LEN

10 months agoprctl: Disable prctl(PR_SET_MDWE) on parisc
Helge Deller [Sat, 18 Nov 2023 18:33:35 +0000 (19:33 +0100)]
prctl: Disable prctl(PR_SET_MDWE) on parisc

systemd-254 tries to use prctl(PR_SET_MDWE) for it's MemoryDenyWriteExecute
functionality, but fails on parisc which still needs executable stacks in
certain combinations of gcc/glibc/kernel.

Disable prctl(PR_SET_MDWE) by returning -EINVAL for now on parisc, until
userspace has catched up.

Signed-off-by: Helge Deller <deller@gmx.de>
Co-developed-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Sam James <sam@gentoo.org>
Closes: https://github.com/systemd/systemd/issues/29775
Tested-by: Sam James <sam@gentoo.org>
Link: https://lore.kernel.org/all/875y2jro9a.fsf@gentoo.org/
Cc: <stable@vger.kernel.org> # v6.3+
10 months agoMerge tag 'for-6.7/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
Linus Torvalds [Sat, 18 Nov 2023 18:02:16 +0000 (10:02 -0800)]
Merge tag 'for-6.7/dm-fixes' of git://git./linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Various fixes for the DM delay target to address regressions
   introduced during the 6.7 merge window

 - Fixes to both DM bufio and the verity target for no-sleep mode,
   to address sleeping while atomic issues

 - Update DM crypt target in response to the treewide change that
   made MAX_ORDER inclusive

* tag 'for-6.7/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-crypt: start allocating with MAX_ORDER
  dm-verity: don't use blocking calls from tasklets
  dm-bufio: fix no-sleep mode
  dm-delay: avoid duplicate logic
  dm-delay: fix bugs introduced by kthread mode
  dm-delay: fix a race between delay_presuspend and delay_bio

10 months agoparisc/power: Fix power soft-off when running on qemu
Helge Deller [Fri, 17 Nov 2023 15:43:52 +0000 (16:43 +0100)]
parisc/power: Fix power soft-off when running on qemu

Firmware returns the physical address of the power switch,
so need to use gsc_writel() instead of direct memory access.

Fixes: d0c219472980 ("parisc/power: Add power soft-off when running on qemu")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v6.0+
10 months agoparisc: Replace strlcpy() with strscpy()
Kees Cook [Thu, 16 Nov 2023 19:13:40 +0000 (11:13 -0800)]
parisc: Replace strlcpy() with strscpy()

strlcpy() reads the entire source buffer first. This read may exceed
the destination size limit. This is both inefficient and can lead
to linear read overflows if a source string is not NUL-terminated[1].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
Link: https://github.com/KSPP/linux/issues/89
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Helge Deller <deller@gmx.de>
10 months agoMerge tag 'i2c-for-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Sat, 18 Nov 2023 17:44:14 +0000 (09:44 -0800)]
Merge tag 'i2c-for-6.7-rc2' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Revert a not-working conversion to generic recovery for PXA,
  use proper IO accessors for designware, and use proper PM level
  for ocores to allow accessing interrupt providers late"

* tag 'i2c-for-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: ocores: Move system PM hooks to the NOIRQ phase
  i2c: designware: Fix corrupted memory seen in the ISR
  Revert "i2c: pxa: move to generic GPIO recovery"

10 months agoMerge tag 'turbostat-2023.11.07' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 18 Nov 2023 17:09:17 +0000 (09:09 -0800)]
Merge tag 'turbostat-2023.11.07' of git://git./linux/kernel/git/lenb/linux

Pull turbostat updates from Len Brown:

 - Turbostat features are now table-driven (Rui Zhang)

 - Add support for some new platforms (Sumeet Pawnikar, Rui Zhang)

 - Gracefully run in configs when CPUs are limited (Rui Zhang, Srinivas
   Pandruvada)

 - misc minor fixes

[ This came in during the merge window, but sorting out the signed tag
  took a while, so thus the late merge   - Linus ]

* tag 'turbostat-2023.11.07' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (86 commits)
  tools/power turbostat: version 2023.11.07
  tools/power/turbostat: bugfix "--show IPC"
  tools/power/turbostat: Add initial support for LunarLake
  tools/power/turbostat: Add initial support for ArrowLake
  tools/power/turbostat: Add initial support for GrandRidge
  tools/power/turbostat: Add initial support for SierraForest
  tools/power/turbostat: Add initial support for GraniteRapids
  tools/power/turbostat: Add MSR_CORE_C1_RES support for spr_features
  tools/power/turbostat: Move process to root cgroup
  tools/power/turbostat: Handle cgroup v2 cpu limitation
  tools/power/turbostat: Abstrct function for parsing cpu string
  tools/power/turbostat: Handle offlined CPUs in cpu_subset
  tools/power/turbostat: Obey allowed CPUs for system summary
  tools/power/turbostat: Obey allowed CPUs for primary thread/core detection
  tools/power/turbostat: Abstract several functions
  tools/power/turbostat: Obey allowed CPUs during startup
  tools/power/turbostat: Obey allowed CPUs when accessing CPU counters
  tools/power/turbostat: Introduce cpu_allowed_set
  tools/power/turbostat: Remove PC7/PC9 support on ADL/RPL
  tools/power/turbostat: Enable MSR_CORE_C1_RES on recent Intel client platforms
  ...

10 months agoMerge tag 'bcachefs-2023-11-17' of https://evilpiepirate.org/git/bcachefs
Linus Torvalds [Fri, 17 Nov 2023 22:36:58 +0000 (14:36 -0800)]
Merge tag 'bcachefs-2023-11-17' of https://evilpiepirate.org/git/bcachefs

Pull bcachefs fixes from Kent Overstreet:
 "Lots of small fixes for minor nits and compiler warnings.

  Bigger items:

   - The six locks lost wakeup is finally fixed: six_read_trylock() was
     checking for the waiting bit before decrementing the number of
     readers - validated the fix with a torture test.

   - Fix for a memory reclaim issue: when needing to reallocate a key
     cache key, we now do our usual GFP_NOWAIT; unlock(); GFP_KERNEL
     dance.

   - Multiple deleted inodes btree fixes

   - Fix an issue in fsck, where i_nlink would be recalculated
     incorrectly for hardlinked files if a snapshot had ever been taken.

   - Kill journal pre-reservations: This is a bigger patch than I would
     normally send at this point, but it deletes code and it fixes some
     of our tests that would sporadically die with the journal getting
     stuck, and it's a performance improvement, too"

* tag 'bcachefs-2023-11-17' of https://evilpiepirate.org/git/bcachefs: (22 commits)
  bcachefs: Fix missing locking for dentry->d_parent access
  bcachefs: six locks: Fix lost wakeup
  bcachefs: Fix no_data_io mode checksum check
  bcachefs: Fix bch2_check_nlinks() for snapshots
  bcachefs: Don't decrease BTREE_ITER_MAX when LOCKDEP=y
  bcachefs: Disable debug log statements
  bcachefs: Fix missing transaction commit
  bcachefs: Fix error path in bch2_mount()
  bcachefs: Fix potential sleeping during mount
  bcachefs: Fix iterator leak in may_delete_deleted_inode()
  bcachefs: Kill journal pre-reservations
  bcachefs: Check for nonce offset inconsistency in data_update path
  bcachefs: Make sure to drop/retake btree locks before reclaim
  bcachefs: btree_trans->write_locked
  bcachefs: Run btree key cache shrinker less aggressively
  bcachefs: Split out btree_key_cache_types.h
  bcachefs: Guard against insufficient devices to create stripes
  bcachefs: Fix null ptr deref in bch2_backpointer_get_node()
  bcachefs: Fix multiple -Warray-bounds warnings
  bcachefs: Use DECLARE_FLEX_ARRAY() helper and fix multiple -Warray-bounds warnings
  ...

10 months agoMerge tag 'mm-hotfixes-stable-2023-11-17-14-04' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Fri, 17 Nov 2023 22:19:46 +0000 (14:19 -0800)]
Merge tag 'mm-hotfixes-stable-2023-11-17-14-04' of git://git./linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Thirteen hotfixes. Seven are cc:stable and the remainder pertain to
  post-6.6 issues or aren't considered suitable for backporting"

* tag 'mm-hotfixes-stable-2023-11-17-14-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  mm: more ptep_get() conversion
  parisc: fix mmap_base calculation when stack grows upwards
  mm/damon/core.c: avoid unintentional filtering out of schemes
  mm: kmem: drop __GFP_NOFAIL when allocating objcg vectors
  mm/damon/sysfs-schemes: handle tried region directory allocation failure
  mm/damon/sysfs-schemes: handle tried regions sysfs directory allocation failure
  mm/damon/sysfs: check error from damon_sysfs_update_target()
  mm: fix for negative counter: nr_file_hugepages
  selftests/mm: add hugetlb_fault_after_madv to .gitignore
  selftests/mm: restore number of hugepages
  selftests: mm: fix some build warnings
  selftests: mm: skip whole test instead of failure
  mm/damon/sysfs: eliminate potential uninitialized variable warning

10 months agoMerge tag 'block-6.7-2023-11-17' of git://git.kernel.dk/linux
Linus Torvalds [Fri, 17 Nov 2023 22:08:14 +0000 (14:08 -0800)]
Merge tag 'block-6.7-2023-11-17' of git://git.kernel.dk/linux

Pull block fix from Jens Axboe:
 "Just a single fix from Christoph/Ming, fixing a case where integrity
  IO could be called without having an appropriate queue reference"

* tag 'block-6.7-2023-11-17' of git://git.kernel.dk/linux:
  blk-mq: make sure active queue usage is held for bio_integrity_prep()

10 months agoMerge tag 'io_uring-6.7-2023-11-17' of git://git.kernel.dk/linux
Linus Torvalds [Fri, 17 Nov 2023 22:03:18 +0000 (14:03 -0800)]
Merge tag 'io_uring-6.7-2023-11-17' of git://git.kernel.dk/linux

Pull io_uring fix from Jens Axboe:
 "Just a single fixup for a change we made in this release, which caused
  a regression in sometimes missing fdinfo output if the SQPOLL thread
  had the lock held when fdinfo output was retrieved.

  This brings us back on par with what we had before, where just the
  main uring_lock will prevent that output. We'd love to get rid of that
  too, but that is beyond the scope of this release and will have to
  wait for 6.8"

* tag 'io_uring-6.7-2023-11-17' of git://git.kernel.dk/linux:
  io_uring/fdinfo: remove need for sqpoll lock for thread/pid retrieval

10 months agoMerge tag 'drm-fixes-2023-11-17' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 17 Nov 2023 21:58:26 +0000 (13:58 -0800)]
Merge tag 'drm-fixes-2023-11-17' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Daniel Vetter:
 "This is a 'blast from the bast' fixes pull, because it contains a
  bunch of AGP fixes for amdgpu. Otherwise nothing out of the ordinary.

  Next week is back to Dave unless he's knocked out by some conference
  bug.

   - amdgpu: fixes all over, including a set of AGP fixes

   - nouvea: GSP + other bugfixes

   - ivpu build fix

   - lenovo legion go panel orientation quirk"

* tag 'drm-fixes-2023-11-17' of git://anongit.freedesktop.org/drm/drm: (30 commits)
  drm/amdgpu/gmc9: disable AGP aperture
  drm/amdgpu/gmc10: disable AGP aperture
  drm/amdgpu/gmc11: disable AGP aperture
  drm/amdgpu: add a module parameter to control the AGP aperture
  drm/amdgpu/gmc11: fix logic typo in AGP check
  drm/amd/display: Fix encoder disable logic
  drm/amd/display: Change the DMCUB mailbox memory location from FB to inbox
  drm/amdgpu: add and populate the port num into xgmi topology info
  drm/amd/display: Negate IPS allow and commit bits
  drm/amd/pm: Don't send unload message for reset
  drm/amdgpu: fix ras err_data null pointer issue in amdgpu_ras.c
  drm/amd/display: Clear dpcd_sink_ext_caps if not set
  drm/amd/display: Enable fast plane updates on DCN3.2 and above
  drm/amd/display: fix NULL dereference
  drm/amd/display: fix a NULL pointer dereference in amdgpu_dm_i2c_xfer()
  drm/amd/display: Add null checks for 8K60 lightup
  drm/amd/pm: Fill pcie error counters for gpu v1_4
  drm/amd/pm: Update metric table for smu v13_0_6
  drm/amdgpu: correct chunk_ptr to a pointer to chunk.
  drm/amd/display: Fix DSC not Enabled on Direct MST Sink
  ...

10 months agoNFSD: Fix checksum mismatches in the duplicate reply cache
Chuck Lever [Fri, 10 Nov 2023 16:28:45 +0000 (11:28 -0500)]
NFSD: Fix checksum mismatches in the duplicate reply cache

nfsd_cache_csum() currently assumes that the server's RPC layer has
been advancing rq_arg.head[0].iov_base as it decodes an incoming
request, because that's the way it used to work. On entry, it
expects that buf->head[0].iov_base points to the start of the NFS
header, and excludes the already-decoded RPC header.

These days however, head[0].iov_base now points to the start of the
RPC header during all processing. It no longer points at the NFS
Call header when execution arrives at nfsd_cache_csum().

In a retransmitted RPC the XID and the NFS header are supposed to
be the same as the original message, but the contents of the
retransmitted RPC header can be different. For example, for krb5,
the GSS sequence number will be different between the two. Thus if
the RPC header is always included in the DRC checksum computation,
the checksum of the retransmitted message might not match the
checksum of the original message, even though the NFS part of these
messages is identical.

The result is that, even if a matching XID is found in the DRC,
the checksum mismatch causes the server to execute the
retransmitted RPC transaction again.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
10 months agoNFSD: Fix "start of NFS reply" pointer passed to nfsd_cache_update()
Chuck Lever [Fri, 10 Nov 2023 16:28:33 +0000 (11:28 -0500)]
NFSD: Fix "start of NFS reply" pointer passed to nfsd_cache_update()

The "statp + 1" pointer that is passed to nfsd_cache_update() is
supposed to point to the start of the egress NFS Reply header. In
fact, it does point there for AUTH_SYS and RPCSEC_GSS_KRB5 requests.

But both krb5i and krb5p add fields between the RPC header's
accept_stat field and the start of the NFS Reply header. In those
cases, "statp + 1" points at the extra fields instead of the Reply.
The result is that nfsd_cache_update() caches what looks to the
client like garbage.

A connection break can occur for a number of reasons, but the most
common reason when using krb5i/p is a GSS sequence number window
underrun. When an underrun is detected, the server is obliged to
drop the RPC and the connection to force a retransmit with a fresh
GSS sequence number. The client presents the same XID, it hits in
the server's DRC, and the server returns the garbage cache entry.

The "statp + 1" argument has been used since the oldest changeset
in the kernel history repo, so it has been in nfsd_dispatch()
literally since before history began. The problem arose only when
the server-side GSS implementation was added twenty years ago.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Jeff Layton <jlayton@kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
10 months agoNFSD: Update nfsd_cache_append() to use xdr_stream
Chuck Lever [Fri, 10 Nov 2023 16:28:39 +0000 (11:28 -0500)]
NFSD: Update nfsd_cache_append() to use xdr_stream

When inserting a DRC-cached response into the reply buffer, ensure
that the reply buffer's xdr_stream is updated properly. Otherwise
the server will send a garbage response.

Cc: stable@vger.kernel.org # v6.3+
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
10 months agonfsd: fix file memleak on client_opens_release
Mahmoud Adam [Fri, 10 Nov 2023 18:21:04 +0000 (19:21 +0100)]
nfsd: fix file memleak on client_opens_release

seq_release should be called to free the allocated seq_file

Cc: stable@vger.kernel.org # v5.3+
Signed-off-by: Mahmoud Adam <mngyadam@amazon.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Fixes: 78599c42ae3c ("nfsd4: add file to display list of client's opens")
Reviewed-by: NeilBrown <neilb@suse.de>
Tested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
10 months agodm-crypt: start allocating with MAX_ORDER
Mikulas Patocka [Fri, 17 Nov 2023 17:38:33 +0000 (18:38 +0100)]
dm-crypt: start allocating with MAX_ORDER

Commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely")
changed the meaning of MAX_ORDER from exclusive to inclusive. So, we
can allocate compound pages with up to 1 << MAX_ORDER pages.

Reflect this change in dm-crypt and start trying to allocate compound
pages with MAX_ORDER.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agodm-verity: don't use blocking calls from tasklets
Mikulas Patocka [Fri, 17 Nov 2023 17:37:25 +0000 (18:37 +0100)]
dm-verity: don't use blocking calls from tasklets

The commit 5721d4e5a9cd enhanced dm-verity, so that it can verify blocks
from tasklets rather than from workqueues. This reportedly improves
performance significantly.

However, dm-verity was using the flag CRYPTO_TFM_REQ_MAY_SLEEP from
tasklets which resulted in warnings about sleeping function being called
from non-sleeping context.

BUG: sleeping function called from invalid context at crypto/internal.h:206
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14, name: ksoftirqd/0
preempt_count: 100, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 PID: 14 Comm: ksoftirqd/0 Tainted: G        W 6.7.0-rc1 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x32/0x50
 __might_resched+0x110/0x160
 crypto_hash_walk_done+0x54/0xb0
 shash_ahash_update+0x51/0x60
 verity_hash_update.isra.0+0x4a/0x130 [dm_verity]
 verity_verify_io+0x165/0x550 [dm_verity]
 ? free_unref_page+0xdf/0x170
 ? psi_group_change+0x113/0x390
 verity_tasklet+0xd/0x70 [dm_verity]
 tasklet_action_common.isra.0+0xb3/0xc0
 __do_softirq+0xaf/0x1ec
 ? smpboot_thread_fn+0x1d/0x200
 ? sort_range+0x20/0x20
 run_ksoftirqd+0x15/0x30
 smpboot_thread_fn+0xed/0x200
 kthread+0xdc/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x28/0x40
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork_asm+0x11/0x20
 </TASK>

This commit fixes dm-verity so that it doesn't use the flags
CRYPTO_TFM_REQ_MAY_SLEEP and CRYPTO_TFM_REQ_MAY_BACKLOG from tasklets. The
crypto API would do GFP_ATOMIC allocation instead, it could return -ENOMEM
and we catch -ENOMEM in verity_tasklet and requeue the request to the
workqueue.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # v6.0+
Fixes: 5721d4e5a9cd ("dm verity: Add optional "try_verify_in_tasklet" feature")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agodm-bufio: fix no-sleep mode
Mikulas Patocka [Fri, 17 Nov 2023 17:36:34 +0000 (18:36 +0100)]
dm-bufio: fix no-sleep mode

dm-bufio has a no-sleep mode. When activated (with the
DM_BUFIO_CLIENT_NO_SLEEP flag), the bufio client is read-only and we
could call dm_bufio_get from tasklets. This is used by dm-verity.

Unfortunately, commit 450e8dee51aa ("dm bufio: improve concurrent IO
performance") broke this and the kernel would warn that cache_get()
was calling down_read() from no-sleeping context. The bug can be
reproduced by using "veritysetup open" with the "--use-tasklets"
flag.

This commit fixes dm-bufio, so that the tasklet mode works again, by
expanding use of the 'no_sleep_enabled' static_key to conditionally
use either a rw_semaphore or rwlock_t (which are colocated in the
buffer_tree structure using a union).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # v6.4
Fixes: 450e8dee51aa ("dm bufio: improve concurrent IO performance")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agodm-delay: avoid duplicate logic
Mikulas Patocka [Fri, 17 Nov 2023 17:24:04 +0000 (18:24 +0100)]
dm-delay: avoid duplicate logic

This is small refactoring of dm-delay - we avoid duplicate logic in
flush_delayed_bios and flush_delayed_bios_fast and join these two
functions into one.

We also add cond_resched() to flush_delayed_bios because the list may have
unbounded number of entries.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agodm-delay: fix bugs introduced by kthread mode
Mikulas Patocka [Fri, 17 Nov 2023 17:22:47 +0000 (18:22 +0100)]
dm-delay: fix bugs introduced by kthread mode

This commit fixes the following bugs introduced by commit 70bbeb29fab0
("dm delay: for short delays, use kthread instead of timers and wq"):

* the function flush_worker_fn has no exit path - on unload, this
  function will just loop and consume 100% CPU without any progress

* the wake-up mechanism in flush_worker_fn is racy - a wake up will be
  missed if the process adds entries to the delayed_bios list just
  before set_current_state(TASK_INTERRUPTIBLE)

* flush_delayed_bios_fast submits a bio while holding a global mutex;
  this may deadlock if we have multiple stacked dm-delay devices and
  the underlying device attempts to acquire the mutex too

* if the target constructor fails, it will call delay_dtr. delay_dtr
  would attempt to free dc->timer_lock without it being initialized by
  the constructor.

* if the target constructor's kthread allocation fails, delay_dtr
  would crash trying to dereference dc->worker because it is non-NULL
  due to ERR_PTR.

Fixes: 70bbeb29fab0 ("dm delay: for short delays, use kthread instead of timers and wq")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agodm-delay: fix a race between delay_presuspend and delay_bio
Mikulas Patocka [Fri, 17 Nov 2023 17:21:14 +0000 (18:21 +0100)]
dm-delay: fix a race between delay_presuspend and delay_bio

In delay_presuspend, we set the atomic variable may_delay and then stop
the timer and flush pending bios. The intention here is to prevent the
delay target from re-arming the timer again.

However, this test is racy. Suppose that one thread goes to delay_bio,
sees that dc->may_delay is one and proceeds; now, another thread executes
delay_presuspend, it sets dc->may_delay to zero, deletes the timer and
flushes pending bios. Then, the first thread continues and adds the bio to
delayed->list despite the fact that dc->may_delay is false.

Fix this bug by changing may_delay's type from atomic_t to bool and
only access it while holding the delayed_bios_lock mutex. Note that we
don't have to grab the mutex in delay_resume because there are no bios
in flight at this point.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
10 months agoMerge tag 'ovl-fixes-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/overla...
Linus Torvalds [Fri, 17 Nov 2023 14:18:48 +0000 (09:18 -0500)]
Merge tag 'ovl-fixes-6.7-rc2' of git://git./linux/kernel/git/overlayfs/vfs

Pull overlayfs fixes from Amir Goldstein:
 "A fix to an overlayfs param parsing bug and a misformatted comment"

* tag 'ovl-fixes-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
  ovl: fix memory leak in ovl_parse_param()
  ovl: fix misformatted comment

10 months agoMerge tag 'sound-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 17 Nov 2023 14:05:31 +0000 (09:05 -0500)]
Merge tag 'sound-6.7-rc2' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "A collection of small fixes: including a regression fix in RC1 wrt
  HD-audio / i915 component binding, while the rest are HD-audio
  device-speific fixes / quirks"

* tag 'sound-6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/realtek: Add quirks for HP Laptops
  ALSA: hda/realtek: Add quirks for ASUS 2024 Zenbooks
  ALSA: hda: i915: Alays handle -EPROBE_DEFER
  ALSA: hda/realtek: Enable Mute LED on HP 255 G10
  ALSA: hda: cs35l56: Enable low-power hibernation mode on i2c
  ALSA: hda/realtek - Enable internal speaker of ASUS K6500ZC
  ALSA: hda/realtek: Enable Mute LED on HP 255 G8
  ALSA: hda/realtek - Add Dell ALC295 to pin fall back table

10 months agoMerge tag 'audit-pr-20231116' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoor...
Linus Torvalds [Fri, 17 Nov 2023 13:42:05 +0000 (08:42 -0500)]
Merge tag 'audit-pr-20231116' of git://git./linux/kernel/git/pcmoore/audit

Pull audit fix from Paul Moore:
 "One small audit patch to convert a WARN_ON_ONCE() into a normal
  conditional to avoid scary looking console warnings when eBPF code
  generates audit records from unexpected places"

* tag 'audit-pr-20231116' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
  audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()

10 months agoMerge tag 'amd-drm-fixes-6.7-2023-11-17' of https://gitlab.freedesktop.org/agd5f...
Daniel Vetter [Fri, 17 Nov 2023 10:46:06 +0000 (11:46 +0100)]
Merge tag 'amd-drm-fixes-6.7-2023-11-17' of https://gitlab.freedesktop.org/agd5f/linux into drm-fixes

amd-drm-fixes-6.7-2023-11-17:

amdgpu:
- DMCUB fixes
- SR-IOV fix
- GMC9 fix
- Documentation fix
- DSC MST fix
- CS chunk parsing fix
- SMU13.0.6 fixes
- 8K tiled display fix
- Fix potential NULL pointer dereferences
- Cursor lag fix
- Backlight fix
- DCN s0ix fix
- XGMI fix
- DCN encoder disable logic fix
- AGP aperture fixes

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
From: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117063441.4883-1-alexander.deucher@amd.com