[clang][DependencyScanning] Add a Clang Driver Option to Enable Dependency Scanning Logging (#211966)
This PR adds a clang driver option to enable dependency scanning
logging. The important implementation detail is that the
`DependencyScanningService` holds a single instance of the logger, and
we need to route the option to the logger per scan. An `enable` method
is added to the logger's API to enable it with thread safety. A second
detail worth calling out is that the option is a driver option, so if a
`cc1` command is passed directly to the scanner, the option will not be
processed.
powerpc/ddb: Dump more state in `show pcpu`
Add a new CPU-family `show pcpu` handler, cpu_db_show_mdpcpu() to dump
CPU-specific PCPU data. Only Book-E is populated for now, but AIM may
be populated later.
These new field prints: save areas, TLB miss nesting, the new critical
stack pointer. All of them have been very useful for debugging very
esoteric bugs, so make them easier to see from DDB, instead of having to
rummage through hex dumps.
powerpc/pmap(booke): Allocate 64-bit roots from DMAP
When a TLB miss exception occurs the exception handler must walk the
page table from the root. When the root is allocated from KVA the TLB
miss exception may take another exception if the root page(s) aren't in
the TLB.
The 64-bit page table is modeled after the AIM radix page table, with a
64kB root "page", so 16 pages. This makes regular use of UMA
allocations unable to refer back to the DMAP, which itself is mapped in
TLB1. Now we take another page from the radix pmap driver and grab
contiguous pages from the VM system, so that we can simply refer
directly to DMAP and avoid more nested TLB misses. We can still take a
nested miss, though, because the pmap itself may be in KVA, but this
reduces the nesting.
powerpc/pmap(booke): Rework TID reuse
If a pmap is freed and its memory is reused before its TID reference is
taken, then arbitrary memory will be clobbered. Avoid this by never
dereferencing the pmap pointer in the tidbusy array, and instead using
it as a compare sentinel.
powerpc/booke: Reorganize FRAME_LEAVE
There's a small window between when the SRR* registers are restore and
the exception returns, in which a TLB miss exception may be triggered.
Since there are not special SRR* registers for TLB miss exceptions, the
registers from the frame will be ovwritten, and the FRAME_LEAVE block
will effectively be re-entered on exit, leading to a very hard to
diagnose panic or wedge.
Minimize this chance by pushing the SRR* restore to the last possible
moments, caching them in a PCPU save area instead until the end. This
matches what the AIM side already does.
powerpc/booke: Use a dedicated critical exception stack
A critical exception, such as a watchdog, can trigger at any time,
including the middle of a standard exception prologue or epilogue, so
GPRs, including %r1 (the stack pointer) cannot be trusted at all.
Instead, use a private stack pointer for critical interrupts. Each CPU
now has its own critical exception stack, with the boot stack in the
bss.
powerpc/watchdog: Make e500 watchdog action tunable
There are 4 options for e500 watchdog timeout, which may be core- or
even SoC- specific. Add support to tune the behavior via a tunable
(machdep.watchdog_mode). The tunable value is an integer 0-3.
Merge tag 'integrity-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity
Pull IMA fixes from Mimi Zohar:
- Instantiating the ima_file_truncate and ima_path_truncate LSM hooks
resulted in configfs locking issues.
configfs files should not be measured, appraised, or audited in the
first place, so the builtin policies are updated to exclude them.
- IMA audit messages include the filename, which could result in a page
fault when the filename doesn't exist
- Un-hide the IMA_MEASURE_PCR_IDX Kconfig prompt
* tag 'integrity-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
ima: allow users to specify the pcr index with IMA_MEASURE_PCR_IDX
ima: Check for ERR_PTR from dentry_path() in validate_hash_algo()
ima: don't measure/appraise files on configfs
configfs: move CONFIGFS_MAGIC definition to magic.h
[RISCV] Remove unused tablegen classes. NFC (#221286)
This removes VPatBinaryFPSDNode_R_VF and VPatBinaryFPVL_R_VF. The have
_RM version that are used instead.
