Pull dma-mapping updates from Marek Szyprowski:
- added support for batched cache sync, what improves performance of
dma_map/unmap_sg() operations on ARM64 architecture (Barry Song)
- introduced DMA_ATTR_CC_SHARED attribute for explicitly shared memory
used in confidential computing (Jiri Pirko)
- refactored spaghetti-like code in drivers/of/of_reserved_mem.c and
its clients (Marek Szyprowski, shared branch with device-tree updates
to avoid merge conflicts)
- prepared Contiguous Memory Allocator related code for making dma-buf
drivers modularized (Maxime Ripard)
- added support for benchmarking dma_map_sg() calls to tools/dma
utility (Qinxin Xia)
* tag 'dma-mapping-7.1-2026-04-16' of git://git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux: (24 commits)
dma-buf: heaps: system: document system_cc_shared heap
dma-buf: heaps: system: add system_cc_shared heap for explicitly shared memory
dma-mapping: introduce DMA_ATTR_CC_SHARED for shared memory
mm: cma: Export cma_alloc(), cma_release() and cma_get_name()
dma: contiguous: Export dev_get_cma_area()
dma: contiguous: Make dma_contiguous_default_area static
dma: contiguous: Make dev_get_cma_area() a proper function
dma: contiguous: Turn heap registration logic around
of: reserved_mem: rework fdt_init_reserved_mem_node()
of: reserved_mem: clarify fdt_scan_reserved_mem*() functions
of: reserved_mem: rearrange code a bit
of: reserved_mem: replace CMA quirks by generic methods
of: reserved_mem: switch to ops based OF_DECLARE()
of: reserved_mem: use -ENODEV instead of -ENOENT
of: reserved_mem: remove fdt node from the structure
dma-mapping: fix false kernel-doc comment marker
dma-mapping: Support batch mode for dma_direct_{map,unmap}_sg
dma-mapping: Separate DMA sync issuing and completion waiting
arm64: Provide dcache_inval_poc_nosync helper
arm64: Provide dcache_clean_poc_nosync helper
...
When software issues a Cache Maintenance Operation (CMO) targeting a
dirty cache line, the CPU and DSU cluster may optimize the operation by
combining the CopyBack Write and CMO into a single combined CopyBack
Write plus CMO transaction presented to the interconnect (MCN).
For these combined transactions, the MCN splits the operation into two
separate transactions, one Write and one CMO, and then propagates the
write and optionally the CMO to the downstream memory system or external
Point of Serialization (PoS).
However, the MCN may return an early CompCMO response to the DSU cluster
before the corresponding Write and CMO transactions have completed at
the external PoS or downstream memory. As a result, stale data may be
observed by external observers that are directly connected to the
external PoS or downstream memory.
This erratum affects any system topology in which the following
conditions apply:
- The Point of Serialization (PoS) is located downstream of the
interconnect.
- A downstream observer accesses memory directly, bypassing the
interconnect.
Conditions:
This erratum occurs only when all of the following conditions are met:
1. Software executes a data cache maintenance operation, specifically,
a clean or clean&invalidate by virtual address (DC CVAC or DC
CIVAC), that hits on unique dirty data in the CPU or DSU cache.
This results in a combined CopyBack and CMO being issued to the
interconnect.
2. The interconnect splits the combined transaction into separate Write
and CMO transactions and returns an early completion response to the
CPU or DSU before the write has completed at the downstream memory
or PoS.
3. A downstream observer accesses the affected memory address after the
early completion response is issued but before the actual memory
write has completed. This allows the observer to read stale data
that has not yet been updated at the PoS or downstream memory.
The implementation of workaround put a second loop of CMOs at the same
virtual address whose operation meet erratum conditions to wait until
cache data be cleaned to PoC. This way of implementation mitigates
performance penalty compared to purely duplicate original CMO.
Signed-off-by: Lucas Wei <lucaswei@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
* for-next/sysreg:
: arm64 sysreg updates/cleanups
arm64/sysreg: Remove unused define ARM64_FEATURE_FIELD_BITS
KVM: arm64: selftests: Consider all 7 possible levels of cache
KVM: arm64: selftests: Remove ARM64_FEATURE_FIELD_BITS and its last user
arm64/sysreg: Add ICH_VMCR_EL2
arm64/sysreg: Move generation of RES0/RES1/UNKN to function
arm64/sysreg: Support feature-specific fields with 'Prefix' descriptor
arm64/sysreg: Fix checks for incomplete sysreg definitions
arm64/sysreg: Replace TCR_EL1 field macros
* arm64/for-next/perf:
perf: arm_spe: Add support for filtering on data source
perf: Add perf_event_attr::config4
perf/imx_ddr: Add support for PMU in DB (system interconnects)
perf/imx_ddr: Get and enable optional clks
perf/imx_ddr: Move ida_alloc() from ddr_perf_init() to ddr_perf_probe()
dt-bindings: perf: fsl-imx-ddr: Add compatible string for i.MX8QM, i.MX8QXP and i.MX8DXL
arch_topology: Provide a stub topology_core_has_smt() for !CONFIG_GENERIC_ARCH_TOPOLOGY
perf/arm-ni: Fix and optimise register offset calculation
perf: arm_pmuv3: Add new Cortex and C1 CPU PMUs
perf: arm_cspmu: fix error handling in arm_cspmu_impl_unregister()
perf/arm-ni: Add NoC S3 support
perf/arm_cspmu: nvidia: Add pmevfiltr2 support
perf/arm_cspmu: nvidia: Add revision id matching
perf/arm_cspmu: Add pmpidr support
perf/arm_cspmu: Add callback to reset filter config
perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores
* for-next/misc:
: Miscellaneous patches
arm64: atomics: lse: Remove unused parameters from ATOMIC_FETCH_OP_AND macros
arm64: remove duplicate ARCH_HAS_MEM_ENCRYPT
arm64: mm: use untagged address to calculate page index
arm64: mm: make linear mapping permission update more robust for patial range
arm64/mm: Elide TLB flush in certain pte protection transitions
arm64/mm: Rename try_pgd_pgtable_alloc_init_mm
arm64/mm: Allow __create_pgd_mapping() to propagate pgtable_alloc() errors
arm64: add unlikely hint to MTE async fault check in el0_svc_common
arm64: acpi: add newline to deferred APEI warning
arm64: entry: Clean out some indirection
arm64/mm: Ensure PGD_SIZE is aligned to 64 bytes when PA_BITS = 52
arm64/mm: Drop cpu_set_[default|idmap]_tcr_t0sz()
arm64: remove unused ARCH_PFN_OFFSET
arm64: use SOFTIRQ_ON_OWN_STACK for enabling softirq stack
arm64: Remove assertion on CONFIG_VMAP_STACK
* for-next/kselftest:
: arm64 kselftest patches
kselftest/arm64: Align zt-test register dumps
* for-next/efi-preempt:
: arm64: Make EFI calls preemptible
arm64/efi: Call EFI runtime services without disabling preemption
arm64/efi: Move uaccess en/disable out of efi_set_pgd()
arm64/efi: Drop efi_rt_lock spinlock from EFI arch wrapper
arm64/fpsimd: Permit kernel mode NEON with IRQs off
arm64/fpsimd: Don't warn when EFI execution context is preemptible
efi/runtime-wrappers: Keep track of the efi_runtime_lock owner
efi: Add missing static initializer for efi_mm::cpus_allowed_lock
* for-next/assembler-macro:
: arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in headers
arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
arm64: Replace __ASSEMBLY__ with __ASSEMBLER__ in uapi headers
* for-next/typos:
: Random typo/spelling fixes
arm64: Fix double word in comments
arm64: Fix typos and spelling errors in comments
* for-next/sme-ptrace-disable:
: Support disabling streaming mode via ptrace on SME only systems
kselftest/arm64: Cover disabling streaming mode without SVE in fp-ptrace
kselftst/arm64: Test NT_ARM_SVE FPSIMD format writes on non-SVE systems
arm64/sme: Support disabling streaming mode via ptrace on SME only systems
* for-next/local-tlbi-page-reused:
: arm64, mm: avoid TLBI broadcast if page reused in write fault
arm64, tlbflush: don't TLBI broadcast if page reused in write fault
mm: add spurious fault fixing support for huge pmd
* for-next/mpam: (34 commits)
: Basic Arm MPAM driver (more to follow)
MAINTAINERS: new entry for MPAM Driver
arm_mpam: Add kunit tests for props_mismatch()
arm_mpam: Add kunit test for bitmap reset
arm_mpam: Add helper to reset saved mbwu state
arm_mpam: Use long MBWU counters if supported
arm_mpam: Probe for long/lwd mbwu counters
arm_mpam: Consider overflow in bandwidth counter state
arm_mpam: Track bandwidth counter state for power management
arm_mpam: Add mpam_msmon_read() to read monitor value
arm_mpam: Add helpers to allocate monitors
arm_mpam: Probe and reset the rest of the features
arm_mpam: Allow configuration to be applied and restored during cpu online
arm_mpam: Use a static key to indicate when mpam is enabled
arm_mpam: Register and enable IRQs
arm_mpam: Extend reset logic to allow devices to be reset any time
arm_mpam: Add a helper to touch an MSC from any CPU
arm_mpam: Reset MSC controls from cpuhp callbacks
arm_mpam: Merge supported features during mpam_enable() into mpam_class
arm_mpam: Probe the hardware features resctrl supports
arm_mpam: Add helpers for managing the locking around the mon_sel registers
...
* for-next/acpi:
: arm64 acpi updates
ACPI: GTDT: Get rid of acpi_arch_timer_mem_init()
* for-next/documentation:
: arm64 Documentation updates
Documentation/arm64: Fix the typo of register names
This patch corrects several minor typographical and spelling errors
in comments across multiple arm64 source files.
No functional changes.
Signed-off-by: mrigendrachaubey <mrigendra.chaubey@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
While the GCC and Clang compilers already define __ASSEMBLER__
automatically when compiling assembly code, __ASSEMBLY__ is a
macro that only gets defined by the Makefiles in the kernel.
This can be very confusing when switching between userspace
and kernelspace coding, or when dealing with uapi headers that
rather should use __ASSEMBLER__ instead. So let's standardize now
on the __ASSEMBLER__ macro that is provided by the compilers.
This is a mostly mechanical patch (done with a simple "sed -i"
statement), except for the following files where comments with
mis-spelled macros were tweaked manually:
arch/arm64/include/asm/stacktrace/frame.h
arch/arm64/include/asm/kvm_ptrauth.h
arch/arm64/include/asm/debug-monitors.h
arch/arm64/include/asm/esr.h
arch/arm64/include/asm/scs.h
arch/arm64/include/asm/memory.h
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Pull arm64 updates from Catalin Marinas:
"A quick summary: perf support for Branch Record Buffer Extensions
(BRBE), typical PMU hardware updates, small additions to MTE for
store-only tag checking and exposing non-address bits to signal
handlers, HAVE_LIVEPATCH enabled on arm64, VMAP_STACK forced on.
There is also a TLBI optimisation on hardware that does not require
break-before-make when changing the user PTEs between contiguous and
non-contiguous.
More details:
Perf and PMU updates:
- Add support for new (v3) Hisilicon SLLC and DDRC PMUs
- Add support for Arm-NI PMU integrations that share interrupts
between clock domains within a given instance
- Allow SPE to be configured with a lower sample period than the
minimum recommendation advertised by PMSIDR_EL1.Interval
- Add suppport for Arm's "Branch Record Buffer Extension" (BRBE)
- Adjust the perf watchdog period according to cpu frequency changes
- Minor driver fixes and cleanups
Hardware features:
- Support for MTE store-only checking (FEAT_MTE_STORE_ONLY)
- Support for reporting the non-address bits during a synchronous MTE
tag check fault (FEAT_MTE_TAGGED_FAR)
- Optimise the TLBI when folding/unfolding contiguous PTEs on
hardware with FEAT_BBM (break-before-make) level 2 and no TLB
conflict aborts
Software features:
- Enable HAVE_LIVEPATCH after implementing arch_stack_walk_reliable()
and using the text-poke API for late module relocations
- Force VMAP_STACK always on and change arm64_efi_rt_init() to use
arch_alloc_vmap_stack() in order to avoid KASAN false positives
ACPI:
- Improve SPCR handling and messaging on systems lacking an SPCR
table
Debug:
- Simplify the debug exception entry path
- Drop redundant DBG_MDSCR_* macros
Kselftests:
- Cleanups and improvements for SME, SVE and FPSIMD tests
Miscellaneous:
- Optimise loop to reduce redundant operations in contpte_ptep_get()
- Remove ISB when resetting POR_EL0 during signal handling
- Mark the kernel as tainted on SEA and SError panic
- Remove redundant gcs_free() call"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (93 commits)
arm64/gcs: task_gcs_el0_enable() should use passed task
arm64: Kconfig: Keep selects somewhat alphabetically ordered
arm64: signal: Remove ISB when resetting POR_EL0
kselftest/arm64: Handle attempts to disable SM on SME only systems
kselftest/arm64: Fix SVE write data generation for SME only systems
kselftest/arm64: Test SME on SME only systems in fp-ptrace
kselftest/arm64: Test FPSIMD format data writes via NT_ARM_SVE in fp-ptrace
kselftest/arm64: Allow sve-ptrace to run on SME only systems
arm64/mm: Drop redundant addr increment in set_huge_pte_at()
kselftest/arm4: Provide local defines for AT_HWCAP3
arm64: Mark kernel as tainted on SAE and SError panic
arm64/gcs: Don't call gcs_free() when releasing task_struct
drivers/perf: hisi: Support PMUs with no interrupt
drivers/perf: hisi: Relax the event number check of v2 PMUs
drivers/perf: hisi: Add support for HiSilicon SLLC v3 PMU driver
drivers/perf: hisi: Use ACPI driver_data to retrieve SLLC PMU information
drivers/perf: hisi: Add support for HiSilicon DDRC v3 PMU driver
drivers/perf: hisi: Simplify the probe process for each DDRC version
perf/arm-ni: Support sharing IRQs within an NI instance
perf/arm-ni: Consolidate CPU affinity handling
...
`cpu_switch_to()` and `call_on_irq_stack()` manipulate SP to change
to different stacks along with the Shadow Call Stack if it is enabled.
Those two stack changes cannot be done atomically and both functions
can be interrupted by SErrors or Debug Exceptions which, though unlikely,
is very much broken : if interrupted, we can end up with mismatched stacks
and Shadow Call Stack leading to clobbered stacks.
In `cpu_switch_to()`, it can happen when SP_EL0 points to the new task,
but x18 stills points to the old task's SCS. When the interrupt handler
tries to save the task's SCS pointer, it will save the old task
SCS pointer (x18) into the new task struct (pointed to by SP_EL0),
clobbering it.
In `call_on_irq_stack()`, it can happen when switching from the task stack
to the IRQ stack and when switching back. In both cases, we can be
interrupted when the SCS pointer points to the IRQ SCS, but SP points to
the task stack. The nested interrupt handler pushes its return addresses
on the IRQ SCS. It then detects that SP points to the task stack,
calls `call_on_irq_stack()` and clobbers the task SCS pointer with
the IRQ SCS pointer, which it will also use !
This leads to tasks returning to addresses on the wrong SCS,
or even on the IRQ SCS, triggering kernel panics via CONFIG_VMAP_STACK
or FPAC if enabled.
This is possible on a default config, but unlikely.
However, when enabling CONFIG_ARM64_PSEUDO_NMI, DAIF is unmasked and
instead the GIC is responsible for filtering what interrupts the CPU
should receive based on priority.
Given the goal of emulating NMIs, pseudo-NMIs can be received by the CPU
even in `cpu_switch_to()` and `call_on_irq_stack()`, possibly *very*
frequently depending on the system configuration and workload, leading
to unpredictable kernel panics.
Completely mask DAIF in `cpu_switch_to()` and restore it when returning.
Do the same in `call_on_irq_stack()`, but restore and mask around
the branch.
Mask DAIF even if CONFIG_SHADOW_CALL_STACK is not enabled for consistency
of behaviour between all configurations.
Introduce and use an assembly macro for saving and masking DAIF,
as the existing one saves but only masks IF.
Cc: <stable@vger.kernel.org>
Signed-off-by: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Reported-by: Cristian Prundeanu <cpru@amazon.com>
Fixes: 59b37fe52f ("arm64: Stash shadow stack pointer in the task struct on interrupt")
Tested-by: Cristian Prundeanu <cpru@amazon.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250718142814.133329-1-ada.coupriediaz@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
MDSCR_EL1 has already been defined in tools sysreg format and hence can be
used in all debug monitor related call paths. But using generated sysreg
definitions causes build warnings because there is a mismatch between mdscr
variable (u32) and GENMASK() based masks (long unsigned int). Convert all
variables handling MDSCR_EL1 register as u64 which also reflects its true
width as well.
--------------------------------------------------------------------------
arch/arm64/kernel/debug-monitors.c: In function ‘disable_debug_monitors’:
arch/arm64/kernel/debug-monitors.c:108:13: warning: conversion from ‘long
unsigned int’ to ‘u32’ {aka ‘unsigned int’} changes value from
‘18446744073709518847’ to ‘4294934527’ [-Woverflow]
108 | disable = ~MDSCR_EL1_MDE;
| ^
--------------------------------------------------------------------------
While here, replace an open encoding with MDSCR_EL1_TDCC in __cpu_setup().
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20250613023646.1215700-2-anshuman.khandual@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When FEAT_LPA{,2} are not implemented, the ID_AA64MMFR0_EL1.PARange and
TCR.IPS values corresponding with 52-bit physical addressing are
reserved.
Setting the TCR.IPS field to 0b110 (52-bit physical addressing) has side
effects, such as how the TTBRn_ELx.BADDR fields are interpreted, and so
it is important that disabling FEAT_LPA2 (by overriding the
ID_AA64MMFR0.TGran fields) also presents a PARange field consistent with
that.
So limit the field to 48 bits unless LPA2 is enabled, and update
existing references to use the override consistently.
Fixes: 352b0395b5 ("arm64: Enable 52-bit virtual addressing for 4k and 16k granule configs")
Cc: stable@vger.kernel.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241212081841.2168124-10-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>
For historical reasons we unmask debug exceptions in __cpu_setup(), but
it's not necessary to unmask debug exceptions this early in the
boot/idle entry paths. It would be better to unmask debug exceptions
later in C code as this simplifies the current code and will make it
easier to rework exception masking logic to handle non-DAIF bits in
future (e.g. PSTATE.{ALLINT,PM}).
We started clearing DAIF.D in __cpu_setup() in commit:
2ce39ad151 ("arm64: debug: unmask PSTATE.D earlier")
At the time, we needed to ensure that DAIF.D was clear on the primary
CPU before scheduling and preemption were possible, and chose to do this
in __cpu_setup() so that this occurred in the same place for primary and
secondary CPUs. As we cannot handle debug exceptions this early, we
placed an ISB between initializing MDSCR_EL1 and clearing DAIF.D so that
no exceptions should be triggered.
Subsequently we rewrote the return-from-{idle,suspend} paths to use
__cpu_setup() in commit:
cabe1c81ea ("arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va")
... which allowed for earlier use of the MMU and had the desirable
property of using the same code to reset the CPU in the cold and warm
boot paths. This introduced a bug: DAIF.D was clear while
cpu_do_resume() restored MDSCR_EL1 and other control registers (e.g.
breakpoint/watchpoint control/value registers), and so we could
unexpectedly take debug exceptions.
We fixed that in commit:
744c6c37cc ("arm64: kernel: Fix unmasked debug exceptions when restoring mdscr_el1")
... by having cpu_do_resume() use the `disable_dbg` macro to set DAIF.D
before restoring MDSCR_EL1 and other control registers. This relies on
DAIF.D being subsequently cleared again in cpu_resume().
Subsequently we reworked DAIF masking in commit:
0fbeb31875 ("arm64: explicitly mask all exceptions")
... where we began enforcing a policy that DAIF.D being set implies all
other DAIF bits are set, and so e.g. we cannot take an IRQ while DAIF.D
is set. As part of this the use of `disable_dbg` in cpu_resume() was
replaced with `disable_daif` for consistency with the rest of the
kernel.
These days, there's no need to clear DAIF.D early within __cpu_setup():
* setup_arch() clears DAIF.DA before scheduling and preemption are
possible on the primary CPU, avoiding the problem we we originally
trying to work around.
Note: DAIF.IF get cleared later when interrupts are enabled for the
first time.
* secondary_start_kernel() clears all DAIF bits before scheduling and
preemption are possible on secondary CPUs.
Note: with pseudo-NMI, the PMR is initialized here before any DAIF
bits are cleared. Similar will be necessary for the architectural NMI.
* cpu_suspend() restores all DAIF bits when returning from idle,
ensuring that we don't unexpectedly leave DAIF.D clear or set.
Note: with pseudo-NMI, the PMR is initialized here before DAIF is
cleared. Similar will be necessary for the architectural NMI.
This patch removes the unmasking of debug exceptions from __cpu_setup(),
relying on the above locations to initialize DAIF. This allows some
other cleanups:
* It is no longer necessary for cpu_resume() to explicitly mask debug
(or other) exceptions, as it is always called with all DAIF bits set.
Thus we drop the use of `disable_daif`.
* The `enable_dbg` macro is no longer used, and so is dropped.
* It is no longer necessary to have an ISB immediately after
initializing MDSCR_EL1 in __cpu_setup(), and we can revert to relying
on the context synchronization that occurs when the MMU is enabled
between __cpu_setup() and code which clears DAIF.D
Comments are added to setup_arch() and secondary_start_kernel() to
explain the initial unmasking of the DAIF bits.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240422113523.4070414-3-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
A comment in the disable_step_tsk macro refers to synchronising with
enable_dbg, as historically the entry used enable_dbg to unmask debug
exceptions after disabling single-stepping.
These days the unmasking happens in entry-common.c via
local_daif_restore() or local_daif_inherit(), so the comment is stale.
This logic is likely to chang in future, so it would be best to avoid
referring to those macros specifically.
Update the comment to take this into account, and describe it in terms
of clearing DAIF.D so that it doesn't macro where this logic lives nor
what it is called.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240422113523.4070414-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Currently we're using "sbfx" to extract the PMUVer from ID_AA64DFR0_EL1
and skip the init/reset if no PMU present when the extracted PMUVer is
negative or is zero. However for PMUv3p8 the PMUVer will be 0b1000 and
PMUVer extracted by "sbfx" will always be negative and we'll skip the
init/reset in __init_el2_debug/reset_pmuserenr_el0 unexpectedly.
So this patch use "ubfx" instead of "sbfx" to extract the PMUVer. If
the PMUVer is implementation defined (0b1111) or not implemented(0b0000)
then skip the reset/init. Previously we'll also skip the init/reset
if the PMUVer is higher than the version we known (currently PMUv3p9),
with this patch we'll only skip if the PMU is not implemented or
implementation defined. This keeps consistence with how we probe
the PMU in the driver with pmuv3_implemented().
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20240411123030.7201-1-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
* for-next/stage1-lpa2: (48 commits)
: Add support for LPA2 and WXN and stage 1
arm64/mm: Avoid ID mapping of kpti flag if it is no longer needed
arm64/mm: Use generic __pud_free() helper in pud_free() implementation
arm64: gitignore: ignore relacheck
arm64: Use Signed/Unsigned enums for TGRAN{4,16,64} and VARange
arm64: mm: Make PUD folding check in set_pud() a runtime check
arm64: mm: add support for WXN memory translation attribute
mm: add arch hook to validate mmap() prot flags
arm64: defconfig: Enable LPA2 support
arm64: Enable 52-bit virtual addressing for 4k and 16k granule configs
arm64: kvm: avoid CONFIG_PGTABLE_LEVELS for runtime levels
arm64: ptdump: Deal with translation levels folded at runtime
arm64: ptdump: Disregard unaddressable VA space
arm64: mm: Add support for folding PUDs at runtime
arm64: kasan: Reduce minimum shadow alignment and enable 5 level paging
arm64: mm: Add 5 level paging support to fixmap and swapper handling
arm64: Enable LPA2 at boot if supported by the system
arm64: mm: add LPA2 and 5 level paging support to G-to-nG conversion
arm64: mm: Add definitions to support 5 levels of paging
arm64: mm: Add LPA2 support to phys<->pte conversion routines
arm64: mm: Wire up TCR.DS bit to PTE shareability fields
...
Update the early kernel mapping code to take 52-bit virtual addressing
into account based on the LPA2 feature. This is a bit more involved than
LVA (which is supported with 64k pages only), given that some page table
descriptor bits change meaning in this case.
To keep the handling in asm to a minimum, the initial ID map is still
created with 48-bit virtual addressing, which implies that the kernel
image must be loaded into 48-bit addressable physical memory. This is
currently required by the boot protocol, even though we happen to
support placement outside of that for LVA/64k based configurations.
Enabling LPA2 involves more than setting TCR.T1SZ to a lower value,
there is also a DS bit in TCR that needs to be set, and which changes
the meaning of bits [9:8] in all page table descriptors. Since we cannot
enable DS and every live page table descriptor at the same time, let's
pivot through another temporary mapping. This avoids the need to
reintroduce manipulations of the page tables with the MMU and caches
disabled.
To permit the LPA2 feature to be overridden on the kernel command line,
which may be necessary to work around silicon errata, or to deal with
mismatched features on heterogeneous SoC designs, test for CPU feature
overrides first, and only then enable LPA2.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-78-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In preparation for enabling LPA2 support, introduce the mask values for
converting between physical addresses and their representations in a
page table descriptor.
While at it, move the pte_to_phys asm macro into its only user, so that
we can freely modify it to use its input value register as a temp
register.
For LPA2, the PTE_ADDR_MASK contains two non-adjacent sequences of zero
bits, which means it no longer fits into the immediate field of an
ordinary ALU instruction. So let's redefine it to include the bits in
between as well, and only use it when converting from physical address
to PTE representation, where the distinction does not matter. Also
update the name accordingly to emphasize this.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-75-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Add support for overriding the VARange field of the MMFR2 CPU ID
register. This permits the associated LVA feature to be overridden early
enough for the boot code that creates the kernel mapping to take it into
account.
Given that LPA2 implies LVA, disabling the latter should disable the
former as well. So override the ID_AA64MMFR0.TGran field of the current
page size as well if it advertises support for 52-bit addressing.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-71-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The asm code that creates the initial ID map is rather intricate and
hard to follow. This is problematic because it makes adding support for
things like LPA2 or WXN more difficult than necessary. Also, it is
parameterized like the rest of the MM code to run with a configurable
number of levels, which is rather pointless, given that all AArch64 CPUs
implement support for 48-bit virtual addressing, and that many systems
exist with DRAM located outside of the 39-bit addressable range, which
is the only smaller VA size that is widely used, and we need additional
tricks to make things work in that combination.
So let's bite the bullet, and rip out all the asm macros, and fiddly
code, and replace it with a C implementation based on the newly added
routines for creating the early kernel VA mappings. And while at it,
create the initial ID map based on 48-bit virtual addressing as well,
regardless of the number of configured levels for the kernel proper.
Note that this code may execute with the MMU and caches disabled, and is
therefore not permitted to make unaligned accesses. This shouldn't
generally happen in any case for the algorithm as implemented, but to be
sure, let's pass -mstrict-align to the compiler just in case.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-66-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
We no longer disable softirqs or preemption when doing kernel mode SIMD,
and so for fully preemptible kernels, there is no longer a need to do any
explicit yielding (and for non-preemptible kernels, yielding is not
needed either).
That leaves voluntary preemption, where only explicit yield calls may
result in a reschedule. To retain the existing behavior for such a
configuration, we should take the new situation into account, where the
preempt count will be zero rather than one, and yielding to pending
softirqs is unnecessary.
Fixes: aefbab8e77 ("arm64: fpsimd: Preserve/restore kernel mode NEON at context switch")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240111112447.577640-2-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>
