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arm64 updates for 4.18:

Browse Source 
- Spectre v4 mitigation (Speculative Store Bypass Disable) support for
   arm64 using SMC firmware call to set a hardware chicken bit
 
 - ACPI PPTT (Processor Properties Topology Table) parsing support and
   enable the feature for arm64
 
 - Report signal frame size to user via auxv (AT_MINSIGSTKSZ). The
   primary motivation is Scalable Vector Extensions which requires more
   space on the signal frame than the currently defined MINSIGSTKSZ
 
 - ARM perf patches: allow building arm-cci as module, demote dev_warn()
   to dev_dbg() in arm-ccn event_init(), miscellaneous cleanups
 
 - cmpwait() WFE optimisation to avoid some spurious wakeups
 
 - L1_CACHE_BYTES reverted back to 64 (for performance reasons that have
   to do with some network allocations) while keeping ARCH_DMA_MINALIGN
   to 128. cache_line_size() returns the actual hardware Cache Writeback
   Granule
 
 - Turn LSE atomics on by default in Kconfig
 
 - Kernel fault reporting tidying
 
 - Some #include and miscellaneous cleanups
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Catalin Marinas:
 "Apart from the core arm64 and perf changes, the Spectre v4 mitigation
  touches the arm KVM code and the ACPI PPTT support touches drivers/
  (acpi and cacheinfo). I should have the maintainers' acks in place.

  Summary:

   - Spectre v4 mitigation (Speculative Store Bypass Disable) support
     for arm64 using SMC firmware call to set a hardware chicken bit

   - ACPI PPTT (Processor Properties Topology Table) parsing support and
     enable the feature for arm64

   - Report signal frame size to user via auxv (AT_MINSIGSTKSZ). The
     primary motivation is Scalable Vector Extensions which requires
     more space on the signal frame than the currently defined
     MINSIGSTKSZ

   - ARM perf patches: allow building arm-cci as module, demote
     dev_warn() to dev_dbg() in arm-ccn event_init(), miscellaneous
     cleanups

   - cmpwait() WFE optimisation to avoid some spurious wakeups

   - L1_CACHE_BYTES reverted back to 64 (for performance reasons that
     have to do with some network allocations) while keeping
     ARCH_DMA_MINALIGN to 128. cache_line_size() returns the actual
     hardware Cache Writeback Granule

   - Turn LSE atomics on by default in Kconfig

   - Kernel fault reporting tidying

   - Some #include and miscellaneous cleanups"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (53 commits)
  arm64: Fix syscall restarting around signal suppressed by tracer
  arm64: topology: Avoid checking numa mask for scheduler MC selection
  ACPI / PPTT: fix build when CONFIG_ACPI_PPTT is not enabled
  arm64: cpu_errata: include required headers
  arm64: KVM: Move VCPU_WORKAROUND_2_FLAG macros to the top of the file
  arm64: signal: Report signal frame size to userspace via auxv
  arm64/sve: Thin out initialisation sanity-checks for sve_max_vl
  arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID
  arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests
  arm64: KVM: Add ARCH_WORKAROUND_2 support for guests
  arm64: KVM: Add HYP per-cpu accessors
  arm64: ssbd: Add prctl interface for per-thread mitigation
  arm64: ssbd: Introduce thread flag to control userspace mitigation
  arm64: ssbd: Restore mitigation status on CPU resume
  arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation
  arm64: ssbd: Add global mitigation state accessor
  arm64: Add 'ssbd' command-line option
  arm64: Add ARCH_WORKAROUND_2 probing
  arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2
  arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1
  ...
This commit is contained in:
Linus Torvalds 2018-06-08 11:10:58 -07:00
commit 410feb75de
61 changed files with 1692 additions and 263 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/admin-guide/kernel-parameters.txt
View File

@ -4106,6 +4106,23 @@
expediting. Set to zero to disable automatic
expediting.
ssbd= [ARM64,HW]
Speculative Store Bypass Disable control
On CPUs that are vulnerable to the Speculative
Store Bypass vulnerability and offer a
firmware based mitigation, this parameter
indicates how the mitigation should be used:
force-on: Unconditionally enable mitigation for
for both kernel and userspace
force-off: Unconditionally disable mitigation for
for both kernel and userspace
kernel: Always enable mitigation in the
kernel, and offer a prctl interface
to allow userspace to register its
interest in being mitigated too.
stack_guard_gap= [MM]
override the default stack gap protection. The value
is in page units and it defines how many pages prior

2
arch/arm/common/mcpm_entry.c
View File

@ -9,6 +9,7 @@
* published by the Free Software Foundation.
*/
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irqflags.h>
@ -174,6 +175,7 @@ bool mcpm_is_available(void)
{
return (platform_ops) ? true : false;
}
EXPORT_SYMBOL_GPL(mcpm_is_available);
/*
* We can't use regular spinlocks. In the switcher case, it is possible

12
arch/arm/include/asm/kvm_host.h
View File

@ -325,6 +325,18 @@ static inline bool kvm_arm_harden_branch_predictor(void)
}
}
#define KVM_SSBD_UNKNOWN -1
#define KVM_SSBD_FORCE_DISABLE 0
#define KVM_SSBD_KERNEL 1
#define KVM_SSBD_FORCE_ENABLE 2
#define KVM_SSBD_MITIGATED 3
static inline int kvm_arm_have_ssbd(void)
{
/* No way to detect it yet, pretend it is not there. */
return KVM_SSBD_UNKNOWN;
}
static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}

5
arch/arm/include/asm/kvm_mmu.h
View File

@ -356,6 +356,11 @@ static inline int kvm_map_vectors(void)
return 0;
}
static inline int hyp_map_aux_data(void)
{
return 0;
}
#define kvm_phys_to_vttbr(addr) (addr)
#endif /* !__ASSEMBLY__ */

4
arch/arm/kernel/perf_event_v6.c
View File

@ -303,12 +303,10 @@ static void armv6pmu_enable_event(struct perf_event *event)
}
static irqreturn_t
armv6pmu_handle_irq(int irq_num,
void *dev)
armv6pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
unsigned long pmcr = armv6_pmcr_read();
struct perf_sample_data data;
struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
struct pt_regs *regs;
int idx;

3
arch/arm/kernel/perf_event_v7.c
View File

@ -946,11 +946,10 @@ static void armv7pmu_disable_event(struct perf_event *event)
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}
static irqreturn_t armv7pmu_handle_irq(int irq_num, void *dev)
static irqreturn_t armv7pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
u32 pmnc;
struct perf_sample_data data;
struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
struct pt_regs *regs;
int idx;

6
arch/arm/kernel/perf_event_xscale.c
View File

@ -142,11 +142,10 @@ xscale1_pmnc_counter_has_overflowed(unsigned long pmnc,
}
static irqreturn_t
xscale1pmu_handle_irq(int irq_num, void *dev)
xscale1pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
unsigned long pmnc;
struct perf_sample_data data;
struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
struct pt_regs *regs;
int idx;
@ -489,11 +488,10 @@ xscale2_pmnc_counter_has_overflowed(unsigned long of_flags,
}
static irqreturn_t
xscale2pmu_handle_irq(int irq_num, void *dev)
xscale2pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
unsigned long pmnc, of_flags;
struct perf_sample_data data;
struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
struct pt_regs *regs;
int idx;

15
arch/arm64/Kconfig
View File

@ -7,11 +7,13 @@ config ARM64
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ACPI_MCFG if ACPI
select ACPI_SPCR_TABLE if ACPI
select ACPI_PPTT if ACPI
select ARCH_CLOCKSOURCE_DATA
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
@ -923,6 +925,15 @@ config HARDEN_EL2_VECTORS
If unsure, say Y.
config ARM64_SSBD
bool "Speculative Store Bypass Disable" if EXPERT
default y
help
This enables mitigation of the bypassing of previous stores
by speculative loads.
If unsure, say Y.
menuconfig ARMV8_DEPRECATED
bool "Emulate deprecated/obsolete ARMv8 instructions"
depends on COMPAT
@ -1034,6 +1045,7 @@ config ARM64_PAN
config ARM64_LSE_ATOMICS
bool "Atomic instructions"
default y
help
As part of the Large System Extensions, ARMv8.1 introduces new
atomic instructions that are designed specifically to scale in
@ -1042,7 +1054,8 @@ config ARM64_LSE_ATOMICS
Say Y here to make use of these instructions for the in-kernel
atomic routines. This incurs a small overhead on CPUs that do
not support these instructions and requires the kernel to be
built with binutils >= 2.25.
built with binutils >= 2.25 in order for the new instructions
to be used.
config ARM64_VHE
bool "Enable support for Virtualization Host Extensions (VHE)"

4
arch/arm64/include/asm/acpi.h
View File

@ -86,6 +86,10 @@ static inline bool acpi_has_cpu_in_madt(void)
}
struct acpi_madt_generic_interrupt *acpi_cpu_get_madt_gicc(int cpu);
static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
{
return acpi_cpu_get_madt_gicc(cpu)->uid;
}
static inline void arch_fix_phys_package_id(int num, u32 slot) { }
void __init acpi_init_cpus(void);

6
arch/arm64/include/asm/cache.h
View File

@ -33,7 +33,7 @@
#define ICACHE_POLICY_VIPT 2
#define ICACHE_POLICY_PIPT 3
#define L1_CACHE_SHIFT 7
#define L1_CACHE_SHIFT (6)
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
/*
@ -43,7 +43,7 @@
* cache before the transfer is done, causing old data to be seen by
* the CPU.
*/
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN (128)
#ifndef __ASSEMBLY__
@ -77,7 +77,7 @@ static inline u32 cache_type_cwg(void)
static inline int cache_line_size(void)
{
u32 cwg = cache_type_cwg();
return cwg ? 4 << cwg : L1_CACHE_BYTES;
return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
}
#endif /* __ASSEMBLY__ */

4
arch/arm64/include/asm/cmpxchg.h
View File

@ -204,7 +204,9 @@ static inline void __cmpwait_case_##name(volatile void *ptr, \
unsigned long tmp; \
\
asm volatile( \
" ldxr" #sz "\t%" #w "[tmp], %[v]\n" \
" sevl\n" \
" wfe\n" \
" ldxr" #sz "\t%" #w "[tmp], %[v]\n" \
" eor %" #w "[tmp], %" #w "[tmp], %" #w "[val]\n" \
" cbnz %" #w "[tmp], 1f\n" \
" wfe\n" \

3
arch/arm64/include/asm/cpucaps.h
View File

@ -48,7 +48,8 @@
#define ARM64_HAS_CACHE_IDC 27
#define ARM64_HAS_CACHE_DIC 28
#define ARM64_HW_DBM 29
#define ARM64_SSBD 30
#define ARM64_NCAPS 30
#define ARM64_NCAPS 31
#endif /* __ASM_CPUCAPS_H */

22
arch/arm64/include/asm/cpufeature.h
View File

@ -537,6 +537,28 @@ static inline u64 read_zcr_features(void)
return zcr;
}
#define ARM64_SSBD_UNKNOWN -1
#define ARM64_SSBD_FORCE_DISABLE 0
#define ARM64_SSBD_KERNEL 1
#define ARM64_SSBD_FORCE_ENABLE 2
#define ARM64_SSBD_MITIGATED 3
static inline int arm64_get_ssbd_state(void)
{
#ifdef CONFIG_ARM64_SSBD
extern int ssbd_state;
return ssbd_state;
#else
return ARM64_SSBD_UNKNOWN;
#endif
}
#ifdef CONFIG_ARM64_SSBD
void arm64_set_ssbd_mitigation(bool state);
#else
static inline void arm64_set_ssbd_mitigation(bool state) {}
#endif
#endif /* __ASSEMBLY__ */
#endif

13
arch/arm64/include/asm/elf.h
View File

@ -121,6 +121,9 @@
#ifndef __ASSEMBLY__
#include <linux/bug.h>
#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
typedef unsigned long elf_greg_t;
#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
@ -148,6 +151,16 @@ typedef struct user_fpsimd_state elf_fpregset_t;
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)current->mm->context.vdso); \
\
/* \
* Should always be nonzero unless there's a kernel bug. \
* If we haven't determined a sensible value to give to \
* userspace, omit the entry: \
*/ \
if (likely(signal_minsigstksz)) \
NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
else \
NEW_AUX_ENT(AT_IGNORE, 0); \
} while (0)
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES

12
arch/arm64/include/asm/fpsimdmacros.h
View File

@ -207,12 +207,14 @@
str w\nxtmp, [\xpfpsr, #4]
.endm
.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp
.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp, xtmp2
mrs_s x\nxtmp, SYS_ZCR_EL1
bic x\nxtmp, x\nxtmp, ZCR_ELx_LEN_MASK
orr x\nxtmp, x\nxtmp, \xvqminus1
msr_s SYS_ZCR_EL1, x\nxtmp // self-synchronising
bic \xtmp2, x\nxtmp, ZCR_ELx_LEN_MASK
orr \xtmp2, \xtmp2, \xvqminus1
cmp \xtmp2, x\nxtmp
b.eq 921f
msr_s SYS_ZCR_EL1, \xtmp2 // self-synchronising
921:
_for n, 0, 31, _sve_ldr_v \n, \nxbase, \n - 34
_sve_ldr_p 0, \nxbase
_sve_wrffr 0

30
arch/arm64/include/asm/kvm_asm.h
View File

@ -20,6 +20,9 @@
#include <asm/virt.h>
#define VCPU_WORKAROUND_2_FLAG_SHIFT 0
#define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
#define ARM_EXIT_WITH_SERROR_BIT 31
#define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
#define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
@ -71,14 +74,37 @@ extern u32 __kvm_get_mdcr_el2(void);
extern u32 __init_stage2_translation(void);
/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
#define __hyp_this_cpu_ptr(sym) \
({ \
void *__ptr = hyp_symbol_addr(sym); \
__ptr += read_sysreg(tpidr_el2); \
(typeof(&sym))__ptr; \
})
#define __hyp_this_cpu_read(sym) \
({ \
*__hyp_this_cpu_ptr(sym); \
})
#else /* __ASSEMBLY__ */
.macro get_host_ctxt reg, tmp
adr_l \reg, kvm_host_cpu_state
.macro hyp_adr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
add \reg, \reg, \tmp
.endm
.macro hyp_ldr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
ldr \reg, [\reg, \tmp]
.endm
.macro get_host_ctxt reg, tmp
hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp
.endm
.macro get_vcpu_ptr vcpu, ctxt
get_host_ctxt \ctxt, \vcpu
ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]

26
arch/arm64/include/asm/kvm_host.h
View File

@ -216,6 +216,9 @@ struct kvm_vcpu_arch {
/* Exception Information */
struct kvm_vcpu_fault_info fault;
/* State of various workarounds, see kvm_asm.h for bit assignment */
u64 workaround_flags;
/* Guest debug state */
u64 debug_flags;
@ -452,6 +455,29 @@ static inline bool kvm_arm_harden_branch_predictor(void)
return cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR);
}
#define KVM_SSBD_UNKNOWN -1
#define KVM_SSBD_FORCE_DISABLE 0
#define KVM_SSBD_KERNEL 1
#define KVM_SSBD_FORCE_ENABLE 2
#define KVM_SSBD_MITIGATED 3
static inline int kvm_arm_have_ssbd(void)
{
switch (arm64_get_ssbd_state()) {
case ARM64_SSBD_FORCE_DISABLE:
return KVM_SSBD_FORCE_DISABLE;
case ARM64_SSBD_KERNEL:
return KVM_SSBD_KERNEL;
case ARM64_SSBD_FORCE_ENABLE:
return KVM_SSBD_FORCE_ENABLE;
case ARM64_SSBD_MITIGATED:
return KVM_SSBD_MITIGATED;
case ARM64_SSBD_UNKNOWN:
default:
return KVM_SSBD_UNKNOWN;
}
}
void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu);
void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu);

25
arch/arm64/include/asm/kvm_mmu.h
View File

@ -72,7 +72,6 @@
#ifdef __ASSEMBLY__
#include <asm/alternative.h>
#include <asm/cpufeature.h>
/*
* Convert a kernel VA into a HYP VA.
@ -473,6 +472,30 @@ static inline int kvm_map_vectors(void)
}
#endif
#ifdef CONFIG_ARM64_SSBD
DECLARE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
static inline int hyp_map_aux_data(void)
{
int cpu, err;
for_each_possible_cpu(cpu) {
u64 *ptr;
ptr = per_cpu_ptr(&arm64_ssbd_callback_required, cpu);
err = create_hyp_mappings(ptr, ptr + 1, PAGE_HYP);
if (err)
return err;
}
return 0;
}
#else
static inline int hyp_map_aux_data(void)
{
return 0;
}
#endif
#define kvm_phys_to_vttbr(addr) phys_to_ttbr(addr)
#endif /* __ASSEMBLY__ */

5
arch/arm64/include/asm/processor.h
View File

@ -35,6 +35,8 @@
#ifdef __KERNEL__
#include <linux/build_bug.h>
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/stddef.h>
#include <linux/string.h>
@ -244,6 +246,9 @@ void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused);
void cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused);
void cpu_clear_disr(const struct arm64_cpu_capabilities *__unused);
extern unsigned long __ro_after_init signal_minsigstksz; /* sigframe size */
extern void __init minsigstksz_setup(void);
/* Userspace interface for PR_SVE_{SET,GET}_VL prctl()s: */
#define SVE_SET_VL(arg) sve_set_current_vl(arg)
#define SVE_GET_VL() sve_get_current_vl()

1
arch/arm64/include/asm/thread_info.h
View File

@ -94,6 +94,7 @@ void arch_release_task_struct(struct task_struct *tsk);
#define TIF_32BIT 22 /* 32bit process */
#define TIF_SVE 23 /* Scalable Vector Extension in use */
#define TIF_SVE_VL_INHERIT 24 /* Inherit sve_vl_onexec across exec */
#define TIF_SSBD 25 /* Wants SSB mitigation */
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)

6
arch/arm64/include/asm/topology.h
View File

@ -7,14 +7,16 @@
struct cpu_topology {
int thread_id;
int core_id;
int cluster_id;
int package_id;
int llc_id;
cpumask_t thread_sibling;
cpumask_t core_sibling;
cpumask_t llc_siblings;
};
extern struct cpu_topology cpu_topology[NR_CPUS];
#define topology_physical_package_id(cpu) (cpu_topology[cpu].cluster_id)
#define topology_physical_package_id(cpu) (cpu_topology[cpu].package_id)
#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)

3
arch/arm64/include/uapi/asm/auxvec.h
View File

@ -19,7 +19,8 @@
/* vDSO location */
#define AT_SYSINFO_EHDR 33
#define AT_MINSIGSTKSZ 51 /* stack needed for signal delivery */
#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */
#define AT_VECTOR_SIZE_ARCH 2 /* entries in ARCH_DLINFO */
#endif

1
arch/arm64/kernel/Makefile
View File

@ -54,6 +54,7 @@ arm64-obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o
arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
arm64-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
arm64-obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o
arm64-obj-$(CONFIG_ARM64_SSBD) += ssbd.o
obj-y += $(arm64-obj-y) vdso/ probes/
obj-m += $(arm64-obj-m)

3
arch/arm64/kernel/armv8_deprecated.c
View File

@ -13,6 +13,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/uaccess.h>
#include <asm/cpufeature.h>
#include <asm/insn.h>
@ -20,8 +21,6 @@
#include <asm/system_misc.h>
#include <asm/traps.h>
#include <asm/kprobes.h>
#include <linux/uaccess.h>
#include <asm/cpufeature.h>
#define CREATE_TRACE_POINTS
#include "trace-events-emulation.h"

1
arch/arm64/kernel/asm-offsets.c
View File

@ -136,6 +136,7 @@ int main(void)
#ifdef CONFIG_KVM_ARM_HOST
DEFINE(VCPU_CONTEXT, offsetof(struct kvm_vcpu, arch.ctxt));
DEFINE(VCPU_FAULT_DISR, offsetof(struct kvm_vcpu, arch.fault.disr_el1));
DEFINE(VCPU_WORKAROUND_FLAGS, offsetof(struct kvm_vcpu, arch.workaround_flags));
DEFINE(CPU_GP_REGS, offsetof(struct kvm_cpu_context, gp_regs));
DEFINE(CPU_USER_PT_REGS, offsetof(struct kvm_regs, regs));
DEFINE(CPU_FP_REGS, offsetof(struct kvm_regs, fp_regs));

15
arch/arm64/kernel/cacheinfo.c
View File

@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/acpi.h>
#include <linux/cacheinfo.h>
#include <linux/of.h>
@ -46,7 +47,7 @@ static void ci_leaf_init(struct cacheinfo *this_leaf,
static int __init_cache_level(unsigned int cpu)
{
unsigned int ctype, level, leaves, of_level;
unsigned int ctype, level, leaves, fw_level;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) {
@ -59,15 +60,19 @@ static int __init_cache_level(unsigned int cpu)
leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
}
of_level = of_find_last_cache_level(cpu);
if (level < of_level) {
if (acpi_disabled)
fw_level = of_find_last_cache_level(cpu);
else
fw_level = acpi_find_last_cache_level(cpu);
if (level < fw_level) {
/*
* some external caches not specified in CLIDR_EL1
* the information may be available in the device tree
* only unified external caches are considered here
*/
leaves += (of_level - level);
level = of_level;
leaves += (fw_level - level);
level = fw_level;
}
this_cpu_ci->num_levels = level;

182
arch/arm64/kernel/cpu_errata.c
View File

@ -16,6 +16,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/arm-smccc.h>
#include <linux/psci.h>
#include <linux/types.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
@ -232,6 +234,178 @@ enable_smccc_arch_workaround_1(const struct arm64_cpu_capabilities *entry)
}
#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
#ifdef CONFIG_ARM64_SSBD
DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
int ssbd_state __read_mostly = ARM64_SSBD_KERNEL;
static const struct ssbd_options {
const char *str;
int state;
} ssbd_options[] = {
{ "force-on", ARM64_SSBD_FORCE_ENABLE, },
{ "force-off", ARM64_SSBD_FORCE_DISABLE, },
{ "kernel", ARM64_SSBD_KERNEL, },
};
static int __init ssbd_cfg(char *buf)
{
int i;
if (!buf || !buf[0])
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) {
int len = strlen(ssbd_options[i].str);
if (strncmp(buf, ssbd_options[i].str, len))
continue;
ssbd_state = ssbd_options[i].state;
return 0;
}
return -EINVAL;
}
early_param("ssbd", ssbd_cfg);
void __init arm64_update_smccc_conduit(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr,
int nr_inst)
{
u32 insn;
BUG_ON(nr_inst != 1);
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
insn = aarch64_insn_get_hvc_value();
break;
case PSCI_CONDUIT_SMC:
insn = aarch64_insn_get_smc_value();
break;
default:
return;
}
*updptr = cpu_to_le32(insn);
}
void __init arm64_enable_wa2_handling(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr,
int nr_inst)
{
BUG_ON(nr_inst != 1);
/*
* Only allow mitigation on EL1 entry/exit and guest
* ARCH_WORKAROUND_2 handling if the SSBD state allows it to
* be flipped.
*/
if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL)
*updptr = cpu_to_le32(aarch64_insn_gen_nop());
}
void arm64_set_ssbd_mitigation(bool state)
{
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
break;
default:
WARN_ON_ONCE(1);
break;
}
}
static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
int scope)
{
struct arm_smccc_res res;
bool required = true;
s32 val;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
}
switch (psci_ops.conduit) {
case PSCI_CONDUIT_HVC:
arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
case PSCI_CONDUIT_SMC:
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
ARM_SMCCC_ARCH_WORKAROUND_2, &res);
break;
default:
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
}
val = (s32)res.a0;
switch (val) {
case SMCCC_RET_NOT_SUPPORTED:
ssbd_state = ARM64_SSBD_UNKNOWN;
return false;
case SMCCC_RET_NOT_REQUIRED:
pr_info_once("%s mitigation not required\n", entry->desc);
ssbd_state = ARM64_SSBD_MITIGATED;
return false;
case SMCCC_RET_SUCCESS:
required = true;
break;
case 1: /* Mitigation not required on this CPU */
required = false;
break;
default:
WARN_ON(1);
return false;
}
switch (ssbd_state) {
case ARM64_SSBD_FORCE_DISABLE:
pr_info_once("%s disabled from command-line\n", entry->desc);
arm64_set_ssbd_mitigation(false);
required = false;
break;
case ARM64_SSBD_KERNEL:
if (required) {
__this_cpu_write(arm64_ssbd_callback_required, 1);
arm64_set_ssbd_mitigation(true);
}
break;
case ARM64_SSBD_FORCE_ENABLE:
pr_info_once("%s forced from command-line\n", entry->desc);
arm64_set_ssbd_mitigation(true);
required = true;
break;
default:
WARN_ON(1);
break;
}
return required;
}
#endif /* CONFIG_ARM64_SSBD */
#define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max) \
.matches = is_affected_midr_range, \
.midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max)
@ -487,6 +661,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors),
},
#endif
#ifdef CONFIG_ARM64_SSBD
{
.desc = "Speculative Store Bypass Disable",
.capability = ARM64_SSBD,
.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
.matches = has_ssbd_mitigation,
},
#endif
{
}

10
arch/arm64/kernel/cpufeature.c
View File

@ -1606,7 +1606,6 @@ static void __init setup_system_capabilities(void)
void __init setup_cpu_features(void)
{
u32 cwg;
int cls;
setup_system_capabilities();
mark_const_caps_ready();
@ -1619,6 +1618,7 @@ void __init setup_cpu_features(void)
pr_info("emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching\n");
sve_setup();
minsigstksz_setup();
/* Advertise that we have computed the system capabilities */
set_sys_caps_initialised();
@ -1627,13 +1627,9 @@ void __init setup_cpu_features(void)
* Check for sane CTR_EL0.CWG value.
*/
cwg = cache_type_cwg();
cls = cache_line_size();
if (!cwg)
pr_warn("No Cache Writeback Granule information, assuming cache line size %d\n",
cls);
if (L1_CACHE_BYTES < cls)
pr_warn("L1_CACHE_BYTES smaller than the Cache Writeback Granule (%d < %d)\n",
L1_CACHE_BYTES, cls);
pr_warn("No Cache Writeback Granule information, assuming %d\n",
ARCH_DMA_MINALIGN);
}
static bool __maybe_unused

2
arch/arm64/kernel/entry-fpsimd.S
View File

@ -49,7 +49,7 @@ ENTRY(sve_save_state)
ENDPROC(sve_save_state)
ENTRY(sve_load_state)
sve_load 0, x1, x2, 3
sve_load 0, x1, x2, 3, x4
ret
ENDPROC(sve_load_state)

30
arch/arm64/kernel/entry.S
View File

@ -18,6 +18,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/arm-smccc.h>
#include <linux/init.h>
#include <linux/linkage.h>
@ -137,6 +138,25 @@ alternative_else_nop_endif
add \dst, \dst, #(\sym - .entry.tramp.text)
.endm
// This macro corrupts x0-x3. It is the caller's duty
// to save/restore them if required.
.macro apply_ssbd, state, targ, tmp1, tmp2
#ifdef CONFIG_ARM64_SSBD
alternative_cb arm64_enable_wa2_handling
b \targ
alternative_cb_end
ldr_this_cpu \tmp2, arm64_ssbd_callback_required, \tmp1
cbz \tmp2, \targ
ldr \tmp2, [tsk, #TSK_TI_FLAGS]
tbnz \tmp2, #TIF_SSBD, \targ
mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2
mov w1, #\state
alternative_cb arm64_update_smccc_conduit
nop // Patched to SMC/HVC #0
alternative_cb_end
#endif
.endm
.macro kernel_entry, el, regsize = 64
.if \regsize == 32
mov w0, w0 // zero upper 32 bits of x0
@ -163,6 +183,14 @@ alternative_else_nop_endif
ldr x19, [tsk, #TSK_TI_FLAGS] // since we can unmask debug
disable_step_tsk x19, x20 // exceptions when scheduling.
apply_ssbd 1, 1f, x22, x23
#ifdef CONFIG_ARM64_SSBD
ldp x0, x1, [sp, #16 * 0]
ldp x2, x3, [sp, #16 * 1]
#endif
1:
mov x29, xzr // fp pointed to user-space
.else
add x21, sp, #S_FRAME_SIZE
@ -303,6 +331,8 @@ alternative_if ARM64_WORKAROUND_845719
alternative_else_nop_endif
#endif
3:
apply_ssbd 0, 5f, x0, x1
5:
.endif
msr elr_el1, x21 // set up the return data

18
arch/arm64/kernel/fpsimd.c
View File

@ -31,7 +31,6 @@
#include <linux/percpu.h>
#include <linux/prctl.h>
#include <linux/preempt.h>
#include <linux/prctl.h>
#include <linux/ptrace.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
@ -129,7 +128,7 @@ static int sve_default_vl = -1;
#ifdef CONFIG_ARM64_SVE
/* Maximum supported vector length across all CPUs (initially poisoned) */
int __ro_after_init sve_max_vl = -1;
int __ro_after_init sve_max_vl = SVE_VL_MIN;
/* Set of available vector lengths, as vq_to_bit(vq): */
static __ro_after_init DECLARE_BITMAP(sve_vq_map, SVE_VQ_MAX);
static void __percpu *efi_sve_state;
@ -360,22 +359,13 @@ static int sve_proc_do_default_vl(struct ctl_table *table, int write,
return ret;
/* Writing -1 has the special meaning "set to max": */
if (vl == -1) {
/* Fail safe if sve_max_vl wasn't initialised */
if (WARN_ON(!sve_vl_valid(sve_max_vl)))
vl = SVE_VL_MIN;
else
vl = sve_max_vl;
goto chosen;
}
if (vl == -1)
vl = sve_max_vl;
if (!sve_vl_valid(vl))
return -EINVAL;
vl = find_supported_vector_length(vl);
chosen:
sve_default_vl = vl;
sve_default_vl = find_supported_vector_length(vl);
return 0;
}

11
arch/arm64/kernel/hibernate.c
View File

@ -313,6 +313,17 @@ int swsusp_arch_suspend(void)
sleep_cpu = -EINVAL;
__cpu_suspend_exit();
/*
* Just in case the boot kernel did turn the SSBD
* mitigation off behind our back, let's set the state
* to what we expect it to be.
*/
switch (arm64_get_ssbd_state()) {
case ARM64_SSBD_FORCE_ENABLE:
case ARM64_SSBD_KERNEL:
arm64_set_ssbd_mitigation(true);
}
}
local_daif_restore(flags);

3
arch/arm64/kernel/perf_event.c
View File

@ -670,11 +670,10 @@ static void armv8pmu_disable_event(struct perf_event *event)
raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
}
static irqreturn_t armv8pmu_handle_irq(int irq_num, void *dev)
static irqreturn_t armv8pmu_handle_irq(struct arm_pmu *cpu_pmu)
{
u32 pmovsr;
struct perf_sample_data data;
struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
struct pt_regs *regs;
int idx;

5
arch/arm64/kernel/ptrace.c
View File

@ -766,9 +766,6 @@ static void sve_init_header_from_task(struct user_sve_header *header,
vq = sve_vq_from_vl(header->vl);
header->max_vl = sve_max_vl;
if (WARN_ON(!sve_vl_valid(sve_max_vl)))
header->max_vl = header->vl;
header->size = SVE_PT_SIZE(vq, header->flags);
header->max_size = SVE_PT_SIZE(sve_vq_from_vl(header->max_vl),
SVE_PT_REGS_SVE);
@ -1046,8 +1043,6 @@ static const struct user_regset_view user_aarch64_view = {
};
#ifdef CONFIG_COMPAT
#include <linux/compat.h>
enum compat_regset {
REGSET_COMPAT_GPR,
REGSET_COMPAT_VFP,

57
arch/arm64/kernel/signal.c
View File

@ -17,6 +17,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cache.h>
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/kernel.h>
@ -570,8 +571,15 @@ badframe:
return 0;
}
/* Determine the layout of optional records in the signal frame */
static int setup_sigframe_layout(struct rt_sigframe_user_layout *user)
/*
* Determine the layout of optional records in the signal frame
*
* add_all: if true, lays out the biggest possible signal frame for
* this task; otherwise, generates a layout for the current state
* of the task.
*/
static int setup_sigframe_layout(struct rt_sigframe_user_layout *user,
bool add_all)
{
int err;
@ -581,7 +589,7 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user)
return err;
/* fault information, if valid */
if (current->thread.fault_code) {
if (add_all || current->thread.fault_code) {
err = sigframe_alloc(user, &user->esr_offset,
sizeof(struct esr_context));
if (err)
@ -591,8 +599,14 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user)
if (system_supports_sve()) {
unsigned int vq = 0;
if (test_thread_flag(TIF_SVE))
vq = sve_vq_from_vl(current->thread.sve_vl);
if (add_all || test_thread_flag(TIF_SVE)) {
int vl = sve_max_vl;
if (!add_all)
vl = current->thread.sve_vl;
vq = sve_vq_from_vl(vl);
}
err = sigframe_alloc(user, &user->sve_offset,
SVE_SIG_CONTEXT_SIZE(vq));
@ -603,7 +617,6 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user)
return sigframe_alloc_end(user);
}
static int setup_sigframe(struct rt_sigframe_user_layout *user,
struct pt_regs *regs, sigset_t *set)
{
@ -701,7 +714,7 @@ static int get_sigframe(struct rt_sigframe_user_layout *user,
int err;
init_user_layout(user);
err = setup_sigframe_layout(user);
err = setup_sigframe_layout(user, false);
if (err)
return err;
@ -830,11 +843,12 @@ static void do_signal(struct pt_regs *regs)
unsigned long continue_addr = 0, restart_addr = 0;
int retval = 0;
struct ksignal ksig;
bool syscall = in_syscall(regs);
/*
* If we were from a system call, check for system call restarting...
*/
if (in_syscall(regs)) {
if (syscall) {
continue_addr = regs->pc;
restart_addr = continue_addr - (compat_thumb_mode(regs) ? 2 : 4);
retval = regs->regs[0];
@ -886,7 +900,7 @@ static void do_signal(struct pt_regs *regs)
* Handle restarting a different system call. As above, if a debugger
* has chosen to restart at a different PC, ignore the restart.
*/
if (in_syscall(regs) && regs->pc == restart_addr) {
if (syscall && regs->pc == restart_addr) {
if (retval == -ERESTART_RESTARTBLOCK)
setup_restart_syscall(regs);
user_rewind_single_step(current);
@ -936,3 +950,28 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
thread_flags = READ_ONCE(current_thread_info()->flags);
} while (thread_flags & _TIF_WORK_MASK);
}
unsigned long __ro_after_init signal_minsigstksz;
/*
* Determine the stack space required for guaranteed signal devliery.
* This function is used to populate AT_MINSIGSTKSZ at process startup.
* cpufeatures setup is assumed to be complete.
*/
void __init minsigstksz_setup(void)
{
struct rt_sigframe_user_layout user;
init_user_layout(&user);
/*
* If this fails, SIGFRAME_MAXSZ needs to be enlarged. It won't
* be big enough, but it's our best guess:
*/
if (WARN_ON(setup_sigframe_layout(&user, true)))
return;
signal_minsigstksz = sigframe_size(&user) +
round_up(sizeof(struct frame_record), 16) +
16; /* max alignment padding */
}

110
arch/arm64/kernel/ssbd.c Normal file
View File

@ -0,0 +1,110 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 ARM Ltd, All Rights Reserved.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/thread_info.h>
#include <asm/cpufeature.h>
/*
* prctl interface for SSBD
* FIXME: Drop the below ifdefery once merged in 4.18.
*/
#ifdef PR_SPEC_STORE_BYPASS
static int ssbd_prctl_set(struct task_struct *task, unsigned long ctrl)
{
int state = arm64_get_ssbd_state();
/* Unsupported */
if (state == ARM64_SSBD_UNKNOWN)
return -EINVAL;
/* Treat the unaffected/mitigated state separately */
if (state == ARM64_SSBD_MITIGATED) {
switch (ctrl) {
case PR_SPEC_ENABLE:
return -EPERM;
case PR_SPEC_DISABLE:
case PR_SPEC_FORCE_DISABLE:
return 0;
}
}
/*
* Things are a bit backward here: the arm64 internal API
* *enables the mitigation* when the userspace API *disables
* speculation*. So much fun.
*/
switch (ctrl) {
case PR_SPEC_ENABLE:
/* If speculation is force disabled, enable is not allowed */
if (state == ARM64_SSBD_FORCE_ENABLE ||
task_spec_ssb_force_disable(task))
return -EPERM;
task_clear_spec_ssb_disable(task);
clear_tsk_thread_flag(task, TIF_SSBD);
break;
case PR_SPEC_DISABLE:
if (state == ARM64_SSBD_FORCE_DISABLE)
return -EPERM;
task_set_spec_ssb_disable(task);
set_tsk_thread_flag(task, TIF_SSBD);
break;
case PR_SPEC_FORCE_DISABLE:
if (state == ARM64_SSBD_FORCE_DISABLE)
return -EPERM;
task_set_spec_ssb_disable(task);
task_set_spec_ssb_force_disable(task);
set_tsk_thread_flag(task, TIF_SSBD);
break;
default:
return -ERANGE;
}
return 0;
}
int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which,
unsigned long ctrl)
{
switch (which) {
case PR_SPEC_STORE_BYPASS:
return ssbd_prctl_set(task, ctrl);
default:
return -ENODEV;
}
}
static int ssbd_prctl_get(struct task_struct *task)
{
switch (arm64_get_ssbd_state()) {
case ARM64_SSBD_UNKNOWN:
return -EINVAL;
case ARM64_SSBD_FORCE_ENABLE:
return PR_SPEC_DISABLE;
case ARM64_SSBD_KERNEL:
if (task_spec_ssb_force_disable(task))
return PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE;
if (task_spec_ssb_disable(task))
return PR_SPEC_PRCTL | PR_SPEC_DISABLE;
return PR_SPEC_PRCTL | PR_SPEC_ENABLE;
case ARM64_SSBD_FORCE_DISABLE:
return PR_SPEC_ENABLE;
default:
return PR_SPEC_NOT_AFFECTED;
}
}
int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which)
{
switch (which) {
case PR_SPEC_STORE_BYPASS:
return ssbd_prctl_get(task);
default:
return -ENODEV;
}
}
#endif /* PR_SPEC_STORE_BYPASS */

8
arch/arm64/kernel/suspend.c
View File

@ -62,6 +62,14 @@ void notrace __cpu_suspend_exit(void)
*/
if (hw_breakpoint_restore)
hw_breakpoint_restore(cpu);
/*
* On resume, firmware implementing dynamic mitigation will
* have turned the mitigation on. If the user has forcefully
* disabled it, make sure their wishes are obeyed.
*/
if (arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE)
arm64_set_ssbd_mitigation(false);
}
/*

104
arch/arm64/kernel/topology.c
View File

@ -11,7 +11,9 @@
* for more details.
*/
#include <linux/acpi.h>
#include <linux/arch_topology.h>
#include <linux/cacheinfo.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
@ -22,6 +24,7 @@
#include <linux/sched.h>
#include <linux/sched/topology.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <asm/cpu.h>
@ -47,7 +50,7 @@ static int __init get_cpu_for_node(struct device_node *node)
return cpu;
}
static int __init parse_core(struct device_node *core, int cluster_id,
static int __init parse_core(struct device_node *core, int package_id,
int core_id)
{
char name[10];
@ -63,7 +66,7 @@ static int __init parse_core(struct device_node *core, int cluster_id,
leaf = false;
cpu = get_cpu_for_node(t);
if (cpu >= 0) {
cpu_topology[cpu].cluster_id = cluster_id;
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
cpu_topology[cpu].thread_id = i;
} else {
@ -85,7 +88,7 @@ static int __init parse_core(struct device_node *core, int cluster_id,
return -EINVAL;
}
cpu_topology[cpu].cluster_id = cluster_id;
cpu_topology[cpu].package_id = package_id;
cpu_topology[cpu].core_id = core_id;
} else if (leaf) {
pr_err("%pOF: Can't get CPU for leaf core\n", core);
@ -101,7 +104,7 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
bool leaf = true;
bool has_cores = false;
struct device_node *c;
static int cluster_id __initdata;
static int package_id __initdata;
int core_id = 0;
int i, ret;
@ -140,7 +143,7 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
}
if (leaf) {
ret = parse_core(c, cluster_id, core_id++);
ret = parse_core(c, package_id, core_id++);
} else {
pr_err("%pOF: Non-leaf cluster with core %s\n",
cluster, name);
@ -158,7 +161,7 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
pr_warn("%pOF: empty cluster\n", cluster);
if (leaf)
cluster_id++;
package_id++;
return 0;
}
@ -194,7 +197,7 @@ static int __init parse_dt_topology(void)
* only mark cores described in the DT as possible.
*/
for_each_possible_cpu(cpu)
if (cpu_topology[cpu].cluster_id == -1)
if (cpu_topology[cpu].package_id == -1)
ret = -EINVAL;
out_map:
@ -212,7 +215,14 @@ EXPORT_SYMBOL_GPL(cpu_topology);
const struct cpumask *cpu_coregroup_mask(int cpu)
{
return &cpu_topology[cpu].core_sibling;
const cpumask_t *core_mask = &cpu_topology[cpu].core_sibling;
if (cpu_topology[cpu].llc_id != -1) {
if (cpumask_subset(&cpu_topology[cpu].llc_siblings, core_mask))
core_mask = &cpu_topology[cpu].llc_siblings;
}
return core_mask;
}
static void update_siblings_masks(unsigned int cpuid)
@ -224,7 +234,12 @@ static void update_siblings_masks(unsigned int cpuid)
for_each_possible_cpu(cpu) {
cpu_topo = &cpu_topology[cpu];
if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
if (cpuid_topo->llc_id == cpu_topo->llc_id) {
cpumask_set_cpu(cpu, &cpuid_topo->llc_siblings);
cpumask_set_cpu(cpuid, &cpu_topo->llc_siblings);
}
if (cpuid_topo->package_id != cpu_topo->package_id)
continue;
cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
@ -245,7 +260,7 @@ void store_cpu_topology(unsigned int cpuid)
struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
u64 mpidr;
if (cpuid_topo->cluster_id != -1)
if (cpuid_topo->package_id != -1)
goto topology_populated;
mpidr = read_cpuid_mpidr();
@ -259,19 +274,19 @@ void store_cpu_topology(unsigned int cpuid)
/* Multiprocessor system : Multi-threads per core */
cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
cpuid_topo->cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 2) |
cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2) |
MPIDR_AFFINITY_LEVEL(mpidr, 3) << 8;
} else {
/* Multiprocessor system : Single-thread per core */
cpuid_topo->thread_id = -1;
cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpuid_topo->cluster_id = MPIDR_AFFINITY_LEVEL(mpidr, 1) |
cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1) |
MPIDR_AFFINITY_LEVEL(mpidr, 2) << 8 |
MPIDR_AFFINITY_LEVEL(mpidr, 3) << 16;
}
pr_debug("CPU%u: cluster %d core %d thread %d mpidr %#016llx\n",
cpuid, cpuid_topo->cluster_id, cpuid_topo->core_id,
cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
cpuid_topo->thread_id, mpidr);
topology_populated:
@ -287,7 +302,11 @@ static void __init reset_cpu_topology(void)
cpu_topo->thread_id = -1;
cpu_topo->core_id = 0;
cpu_topo->cluster_id = -1;
cpu_topo->package_id = -1;
cpu_topo->llc_id = -1;
cpumask_clear(&cpu_topo->llc_siblings);
cpumask_set_cpu(cpu, &cpu_topo->llc_siblings);
cpumask_clear(&cpu_topo->core_sibling);
cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
@ -296,6 +315,59 @@ static void __init reset_cpu_topology(void)
}
}
#ifdef CONFIG_ACPI
/*
* Propagate the topology information of the processor_topology_node tree to the
* cpu_topology array.
*/
static int __init parse_acpi_topology(void)
{
bool is_threaded;
int cpu, topology_id;
is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK;
for_each_possible_cpu(cpu) {
int i, cache_id;
topology_id = find_acpi_cpu_topology(cpu, 0);
if (topology_id < 0)
return topology_id;
if (is_threaded) {
cpu_topology[cpu].thread_id = topology_id;
topology_id = find_acpi_cpu_topology(cpu, 1);
cpu_topology[cpu].core_id = topology_id;
} else {
cpu_topology[cpu].thread_id = -1;
cpu_topology[cpu].core_id = topology_id;
}
topology_id = find_acpi_cpu_topology_package(cpu);
cpu_topology[cpu].package_id = topology_id;
i = acpi_find_last_cache_level(cpu);
if (i > 0) {
/*
* this is the only part of cpu_topology that has
* a direct relationship with the cache topology
*/
cache_id = find_acpi_cpu_cache_topology(cpu, i);
if (cache_id > 0)
cpu_topology[cpu].llc_id = cache_id;
}
}
return 0;
}
#else
static inline int __init parse_acpi_topology(void)
{
return -EINVAL;
}
#endif
void __init init_cpu_topology(void)
{
reset_cpu_topology();
@ -304,6 +376,8 @@ void __init init_cpu_topology(void)
* Discard anything that was parsed if we hit an error so we
* don't use partial information.
*/
if (of_have_populated_dt() && parse_dt_topology())
if (!acpi_disabled && parse_acpi_topology())
reset_cpu_topology();
else if (of_have_populated_dt() && parse_dt_topology())
reset_cpu_topology();
}

20
arch/arm64/kernel/vmlinux.lds.S
View File

@ -34,25 +34,25 @@ jiffies = jiffies_64;
* 4 KB (see related ASSERT() below) \
*/ \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hyp_idmap_text_start) = .; \
__hyp_idmap_text_start = .; \
*(.hyp.idmap.text) \
VMLINUX_SYMBOL(__hyp_idmap_text_end) = .; \
VMLINUX_SYMBOL(__hyp_text_start) = .; \
__hyp_idmap_text_end = .; \
__hyp_text_start = .; \
*(.hyp.text) \
VMLINUX_SYMBOL(__hyp_text_end) = .;
__hyp_text_end = .;
#define IDMAP_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__idmap_text_start) = .; \
__idmap_text_start = .; \
*(.idmap.text) \
VMLINUX_SYMBOL(__idmap_text_end) = .;
__idmap_text_end = .;
#ifdef CONFIG_HIBERNATION
#define HIBERNATE_TEXT \
. = ALIGN(SZ_4K); \
VMLINUX_SYMBOL(__hibernate_exit_text_start) = .;\
__hibernate_exit_text_start = .; \
*(.hibernate_exit.text) \
VMLINUX_SYMBOL(__hibernate_exit_text_end) = .;
__hibernate_exit_text_end = .;
#else
#define HIBERNATE_TEXT
#endif
@ -60,10 +60,10 @@ jiffies = jiffies_64;
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
#define TRAMP_TEXT \
. = ALIGN(PAGE_SIZE); \
VMLINUX_SYMBOL(__entry_tramp_text_start) = .; \
__entry_tramp_text_start = .; \
*(.entry.tramp.text) \
. = ALIGN(PAGE_SIZE); \
VMLINUX_SYMBOL(__entry_tramp_text_end) = .;
__entry_tramp_text_end = .;
#else
#define TRAMP_TEXT
#endif

38
arch/arm64/kvm/hyp/hyp-entry.S
View File

@ -106,8 +106,44 @@ el1_hvc_guest:
*/
ldr x1, [sp] // Guest's x0
eor w1, w1, #ARM_SMCCC_ARCH_WORKAROUND_1
cbz w1, wa_epilogue
/* ARM_SMCCC_ARCH_WORKAROUND_2 handling */
eor w1, w1, #(ARM_SMCCC_ARCH_WORKAROUND_1 ^ \
ARM_SMCCC_ARCH_WORKAROUND_2)
cbnz w1, el1_trap
mov x0, x1
#ifdef CONFIG_ARM64_SSBD
alternative_cb arm64_enable_wa2_handling
b wa2_end
alternative_cb_end
get_vcpu_ptr x2, x0
ldr x0, [x2, #VCPU_WORKAROUND_FLAGS]
// Sanitize the argument and update the guest flags
ldr x1, [sp, #8] // Guest's x1
clz w1, w1 // Murphy's device:
lsr w1, w1, #5 // w1 = !!w1 without using
eor w1, w1, #1 // the flags...
bfi x0, x1, #VCPU_WORKAROUND_2_FLAG_SHIFT, #1
str x0, [x2, #VCPU_WORKAROUND_FLAGS]
/* Check that we actually need to perform the call */
hyp_ldr_this_cpu x0, arm64_ssbd_callback_required, x2
cbz x0, wa2_end
mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2
smc #0
/* Don't leak data from the SMC call */
mov x3, xzr
wa2_end:
mov x2, xzr
mov x1, xzr
#endif
wa_epilogue:
mov x0, xzr
add sp, sp, #16
eret

42
arch/arm64/kvm/hyp/switch.c
View File

@ -15,6 +15,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/arm-smccc.h>
#include <linux/types.h>
#include <linux/jump_label.h>
#include <uapi/linux/psci.h>
@ -389,6 +390,39 @@ static bool __hyp_text fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
return false;
}
static inline bool __hyp_text __needs_ssbd_off(struct kvm_vcpu *vcpu)
{
if (!cpus_have_const_cap(ARM64_SSBD))
return false;
return !(vcpu->arch.workaround_flags & VCPU_WORKAROUND_2_FLAG);
}
static void __hyp_text __set_guest_arch_workaround_state(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_ARM64_SSBD
/*
* The host runs with the workaround always present. If the
* guest wants it disabled, so be it...
*/
if (__needs_ssbd_off(vcpu) &&
__hyp_this_cpu_read(arm64_ssbd_callback_required))
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, 0, NULL);
#endif
}
static void __hyp_text __set_host_arch_workaround_state(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_ARM64_SSBD
/*
* If the guest has disabled the workaround, bring it back on.
*/
if (__needs_ssbd_off(vcpu) &&
__hyp_this_cpu_read(arm64_ssbd_callback_required))
arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, 1, NULL);
#endif
}
/* Switch to the guest for VHE systems running in EL2 */
int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
{
@ -409,6 +443,8 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
sysreg_restore_guest_state_vhe(guest_ctxt);
__debug_switch_to_guest(vcpu);
__set_guest_arch_workaround_state(vcpu);
do {
/* Jump in the fire! */
exit_code = __guest_enter(vcpu, host_ctxt);
@ -416,6 +452,8 @@ int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu)
/* And we're baaack! */
} while (fixup_guest_exit(vcpu, &exit_code));
__set_host_arch_workaround_state(vcpu);
fp_enabled = fpsimd_enabled_vhe();
sysreg_save_guest_state_vhe(guest_ctxt);
@ -465,6 +503,8 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
__sysreg_restore_state_nvhe(guest_ctxt);
__debug_switch_to_guest(vcpu);
__set_guest_arch_workaround_state(vcpu);
do {
/* Jump in the fire! */
exit_code = __guest_enter(vcpu, host_ctxt);
@ -472,6 +512,8 @@ int __hyp_text __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu)
/* And we're baaack! */
} while (fixup_guest_exit(vcpu, &exit_code));
__set_host_arch_workaround_state(vcpu);
fp_enabled = __fpsimd_enabled_nvhe();
__sysreg_save_state_nvhe(guest_ctxt);

4
arch/arm64/kvm/reset.c
View File

@ -122,6 +122,10 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
/* Reset PMU */
kvm_pmu_vcpu_reset(vcpu);
/* Default workaround setup is enabled (if supported) */
if (kvm_arm_have_ssbd() == KVM_SSBD_KERNEL)
vcpu->arch.workaround_flags |= VCPU_WORKAROUND_2_FLAG;
/* Reset timer */
return kvm_timer_vcpu_reset(vcpu);
}

5
arch/arm64/mm/dma-mapping.c
View File

@ -504,6 +504,11 @@ static int __init arm64_dma_init(void)
max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT))
swiotlb = 1;
WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
TAINT_CPU_OUT_OF_SPEC,
"ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
ARCH_DMA_MINALIGN, cache_line_size());
return atomic_pool_init();
}
arch_initcall(arm64_dma_init);

46
arch/arm64/mm/fault.c
View File

@ -235,8 +235,9 @@ static bool is_el1_instruction_abort(unsigned int esr)
return ESR_ELx_EC(esr) == ESR_ELx_EC_IABT_CUR;
}
static inline bool is_permission_fault(unsigned int esr, struct pt_regs *regs,
unsigned long addr)
static inline bool is_el1_permission_fault(unsigned int esr,
struct pt_regs *regs,
unsigned long addr)
{
unsigned int ec = ESR_ELx_EC(esr);
unsigned int fsc_type = esr & ESR_ELx_FSC_TYPE;
@ -254,6 +255,22 @@ static inline bool is_permission_fault(unsigned int esr, struct pt_regs *regs,
return false;
}
static void die_kernel_fault(const char *msg, unsigned long addr,
unsigned int esr, struct pt_regs *regs)
{
bust_spinlocks(1);
pr_alert("Unable to handle kernel %s at virtual address %016lx\n", msg,
addr);
mem_abort_decode(esr);
show_pte(addr);
die("Oops", regs, esr);
bust_spinlocks(0);
do_exit(SIGKILL);
}
static void __do_kernel_fault(unsigned long addr, unsigned int esr,
struct pt_regs *regs)
{
@ -266,9 +283,7 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
if (!is_el1_instruction_abort(esr) && fixup_exception(regs))
return;
bust_spinlocks(1);
if (is_permission_fault(esr, regs, addr)) {
if (is_el1_permission_fault(esr, regs, addr)) {
if (esr & ESR_ELx_WNR)
msg = "write to read-only memory";
else
@ -279,15 +294,7 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
msg = "paging request";
}
pr_alert("Unable to handle kernel %s at virtual address %08lx\n", msg,
addr);
mem_abort_decode(esr);
show_pte(addr);
die("Oops", regs, esr);
bust_spinlocks(0);
do_exit(SIGKILL);
die_kernel_fault(msg, addr, esr, regs);
}
static void __do_user_fault(struct siginfo *info, unsigned int esr)
@ -447,16 +454,19 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
mm_flags |= FAULT_FLAG_WRITE;
}
if (addr < TASK_SIZE && is_permission_fault(esr, regs, addr)) {
if (addr < TASK_SIZE && is_el1_permission_fault(esr, regs, addr)) {
/* regs->orig_addr_limit may be 0 if we entered from EL0 */
if (regs->orig_addr_limit == KERNEL_DS)
die("Accessing user space memory with fs=KERNEL_DS", regs, esr);
die_kernel_fault("access to user memory with fs=KERNEL_DS",
addr, esr, regs);
if (is_el1_instruction_abort(esr))
die("Attempting to execute userspace memory", regs, esr);
die_kernel_fault("execution of user memory",
addr, esr, regs);
if (!search_exception_tables(regs->pc))
die("Accessing user space memory outside uaccess.h routines", regs, esr);
die_kernel_fault("access to user memory outside uaccess routines",
addr, esr, regs);
}
perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);

1
arch/riscv/kernel/cacheinfo.c
View File

@ -20,7 +20,6 @@ static void ci_leaf_init(struct cacheinfo *this_leaf,
struct device_node *node,
enum cache_type type, unsigned int level)
{
this_leaf->of_node = node;
this_leaf->level = level;
this_leaf->type = type;
/* not a sector cache */

3
drivers/acpi/Kconfig
View File

@ -547,6 +547,9 @@ config ACPI_CONFIGFS
if ARM64
source "drivers/acpi/arm64/Kconfig"
config ACPI_PPTT
bool
endif
config TPS68470_PMIC_OPREGION

1
drivers/acpi/Makefile
View File

@ -88,6 +88,7 @@ obj-$(CONFIG_ACPI_BGRT) += bgrt.o
obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o
obj-$(CONFIG_ACPI_SPCR_TABLE) += spcr.o
obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o
obj-$(CONFIG_ACPI_PPTT) += pptt.o
# processor has its own "processor." module_param namespace
processor-y := processor_driver.o

655
drivers/acpi/pptt.c Normal file
View File

@ -0,0 +1,655 @@
// SPDX-License-Identifier: GPL-2.0
/*
* pptt.c - parsing of Processor Properties Topology Table (PPTT)
*
* Copyright (C) 2018, ARM
*
* This file implements parsing of the Processor Properties Topology Table
* which is optionally used to describe the processor and cache topology.
* Due to the relative pointers used throughout the table, this doesn't
* leverage the existing subtable parsing in the kernel.
*
* The PPTT structure is an inverted tree, with each node potentially
* holding one or two inverted tree data structures describing
* the caches available at that level. Each cache structure optionally
* contains properties describing the cache at a given level which can be
* used to override hardware probed values.
*/
#define pr_fmt(fmt) "ACPI PPTT: " fmt
#include <linux/acpi.h>
#include <linux/cacheinfo.h>
#include <acpi/processor.h>
static struct acpi_subtable_header *fetch_pptt_subtable(struct acpi_table_header *table_hdr,
u32 pptt_ref)
{
struct acpi_subtable_header *entry;
/* there isn't a subtable at reference 0 */
if (pptt_ref < sizeof(struct acpi_subtable_header))
return NULL;
if (pptt_ref + sizeof(struct acpi_subtable_header) > table_hdr->length)
return NULL;
entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr, pptt_ref);
if (entry->length == 0)
return NULL;
if (pptt_ref + entry->length > table_hdr->length)
return NULL;
return entry;
}
static struct acpi_pptt_processor *fetch_pptt_node(struct acpi_table_header *table_hdr,
u32 pptt_ref)
{
return (struct acpi_pptt_processor *)fetch_pptt_subtable(table_hdr, pptt_ref);
}
static struct acpi_pptt_cache *fetch_pptt_cache(struct acpi_table_header *table_hdr,
u32 pptt_ref)
{
return (struct acpi_pptt_cache *)fetch_pptt_subtable(table_hdr, pptt_ref);
}
static struct acpi_subtable_header *acpi_get_pptt_resource(struct acpi_table_header *table_hdr,
struct acpi_pptt_processor *node,
int resource)
{
u32 *ref;
if (resource >= node->number_of_priv_resources)
return NULL;
ref = ACPI_ADD_PTR(u32, node, sizeof(struct acpi_pptt_processor));
ref += resource;
return fetch_pptt_subtable(table_hdr, *ref);
}
static inline bool acpi_pptt_match_type(int table_type, int type)
{
return ((table_type & ACPI_PPTT_MASK_CACHE_TYPE) == type ||
table_type & ACPI_PPTT_CACHE_TYPE_UNIFIED & type);
}
/**
* acpi_pptt_walk_cache() - Attempt to find the requested acpi_pptt_cache
* @table_hdr: Pointer to the head of the PPTT table
* @local_level: passed res reflects this cache level
* @res: cache resource in the PPTT we want to walk
* @found: returns a pointer to the requested level if found
* @level: the requested cache level
* @type: the requested cache type
*
* Attempt to find a given cache level, while counting the max number
* of cache levels for the cache node.
*
* Given a pptt resource, verify that it is a cache node, then walk
* down each level of caches, counting how many levels are found
* as well as checking the cache type (icache, dcache, unified). If a
* level & type match, then we set found, and continue the search.
* Once the entire cache branch has been walked return its max
* depth.
*
* Return: The cache structure and the level we terminated with.
*/
static int acpi_pptt_walk_cache(struct acpi_table_header *table_hdr,
int local_level,
struct acpi_subtable_header *res,
struct acpi_pptt_cache **found,
int level, int type)
{
struct acpi_pptt_cache *cache;
if (res->type != ACPI_PPTT_TYPE_CACHE)
return 0;
cache = (struct acpi_pptt_cache *) res;
while (cache) {
local_level++;
if (local_level == level &&
cache->flags & ACPI_PPTT_CACHE_TYPE_VALID &&
acpi_pptt_match_type(cache->attributes, type)) {
if (*found != NULL && cache != *found)
pr_warn("Found duplicate cache level/type unable to determine uniqueness\n");
pr_debug("Found cache @ level %d\n", level);
*found = cache;
/*
* continue looking at this node's resource list
* to verify that we don't find a duplicate
* cache node.
*/
}
cache = fetch_pptt_cache(table_hdr, cache->next_level_of_cache);
}
return local_level;
}
static struct acpi_pptt_cache *acpi_find_cache_level(struct acpi_table_header *table_hdr,
struct acpi_pptt_processor *cpu_node,
int *starting_level, int level,
int type)
{
struct acpi_subtable_header *res;
int number_of_levels = *starting_level;
int resource = 0;
struct acpi_pptt_cache *ret = NULL;
int local_level;
/* walk down from processor node */
while ((res = acpi_get_pptt_resource(table_hdr, cpu_node, resource))) {
resource++;
local_level = acpi_pptt_walk_cache(table_hdr, *starting_level,
res, &ret, level, type);
/*
* we are looking for the max depth. Since its potentially
* possible for a given node to have resources with differing
* depths verify that the depth we have found is the largest.
*/
if (number_of_levels < local_level)
number_of_levels = local_level;
}
if (number_of_levels > *starting_level)
*starting_level = number_of_levels;
return ret;
}
/**
* acpi_count_levels() - Given a PPTT table, and a cpu node, count the caches
* @table_hdr: Pointer to the head of the PPTT table
* @cpu_node: processor node we wish to count caches for
*
* Given a processor node containing a processing unit, walk into it and count
* how many levels exist solely for it, and then walk up each level until we hit
* the root node (ignore the package level because it may be possible to have
* caches that exist across packages). Count the number of cache levels that
* exist at each level on the way up.
*
* Return: Total number of levels found.
*/
static int acpi_count_levels(struct acpi_table_header *table_hdr,
struct acpi_pptt_processor *cpu_node)
{
int total_levels = 0;
do {
acpi_find_cache_level(table_hdr, cpu_node, &total_levels, 0, 0);
cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
} while (cpu_node);
return total_levels;
}
/**
* acpi_pptt_leaf_node() - Given a processor node, determine if its a leaf
* @table_hdr: Pointer to the head of the PPTT table
* @node: passed node is checked to see if its a leaf
*
* Determine if the *node parameter is a leaf node by iterating the
* PPTT table, looking for nodes which reference it.
*
* Return: 0 if we find a node referencing the passed node (or table error),
* or 1 if we don't.
*/
static int acpi_pptt_leaf_node(struct acpi_table_header *table_hdr,
struct acpi_pptt_processor *node)
{
struct acpi_subtable_header *entry;
unsigned long table_end;
u32 node_entry;
struct acpi_pptt_processor *cpu_node;
u32 proc_sz;
table_end = (unsigned long)table_hdr + table_hdr->length;
node_entry = ACPI_PTR_DIFF(node, table_hdr);
entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
sizeof(struct acpi_table_pptt));
proc_sz = sizeof(struct acpi_pptt_processor *);
while ((unsigned long)entry + proc_sz < table_end) {
cpu_node = (struct acpi_pptt_processor *)entry;
if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&
cpu_node->parent == node_entry)
return 0;
if (entry->length == 0)
return 0;
entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
entry->length);
}
return 1;
}
/**
* acpi_find_processor_node() - Given a PPTT table find the requested processor
* @table_hdr: Pointer to the head of the PPTT table
* @acpi_cpu_id: cpu we are searching for
*
* Find the subtable entry describing the provided processor.
* This is done by iterating the PPTT table looking for processor nodes
* which have an acpi_processor_id that matches the acpi_cpu_id parameter
* passed into the function. If we find a node that matches this criteria
* we verify that its a leaf node in the topology rather than depending
* on the valid flag, which doesn't need to be set for leaf nodes.
*
* Return: NULL, or the processors acpi_pptt_processor*
*/
static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_header *table_hdr,
u32 acpi_cpu_id)
{
struct acpi_subtable_header *entry;
unsigned long table_end;
struct acpi_pptt_processor *cpu_node;
u32 proc_sz;
table_end = (unsigned long)table_hdr + table_hdr->length;
entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
sizeof(struct acpi_table_pptt));
proc_sz = sizeof(struct acpi_pptt_processor *);
/* find the processor structure associated with this cpuid */
while ((unsigned long)entry + proc_sz < table_end) {
cpu_node = (struct acpi_pptt_processor *)entry;
if (entry->length == 0) {
pr_warn("Invalid zero length subtable\n");
break;
}
if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&
acpi_cpu_id == cpu_node->acpi_processor_id &&
acpi_pptt_leaf_node(table_hdr, cpu_node)) {
return (struct acpi_pptt_processor *)entry;
}
entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
entry->length);
}
return NULL;
}
static int acpi_find_cache_levels(struct acpi_table_header *table_hdr,
u32 acpi_cpu_id)
{
int number_of_levels = 0;
struct acpi_pptt_processor *cpu;
cpu = acpi_find_processor_node(table_hdr, acpi_cpu_id);
if (cpu)
number_of_levels = acpi_count_levels(table_hdr, cpu);
return number_of_levels;
}
static u8 acpi_cache_type(enum cache_type type)
{
switch (type) {
case CACHE_TYPE_DATA:
pr_debug("Looking for data cache\n");
return ACPI_PPTT_CACHE_TYPE_DATA;
case CACHE_TYPE_INST:
pr_debug("Looking for instruction cache\n");
return ACPI_PPTT_CACHE_TYPE_INSTR;
default:
case CACHE_TYPE_UNIFIED:
pr_debug("Looking for unified cache\n");
/*
* It is important that ACPI_PPTT_CACHE_TYPE_UNIFIED
* contains the bit pattern that will match both
* ACPI unified bit patterns because we use it later
* to match both cases.
*/
return ACPI_PPTT_CACHE_TYPE_UNIFIED;
}
}
static struct acpi_pptt_cache *acpi_find_cache_node(struct acpi_table_header *table_hdr,
u32 acpi_cpu_id,
enum cache_type type,
unsigned int level,
struct acpi_pptt_processor **node)
{
int total_levels = 0;
struct acpi_pptt_cache *found = NULL;
struct acpi_pptt_processor *cpu_node;
u8 acpi_type = acpi_cache_type(type);
pr_debug("Looking for CPU %d's level %d cache type %d\n",
acpi_cpu_id, level, acpi_type);
cpu_node = acpi_find_processor_node(table_hdr, acpi_cpu_id);
while (cpu_node && !found) {
found = acpi_find_cache_level(table_hdr, cpu_node,
&total_levels, level, acpi_type);
*node = cpu_node;
cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
}
return found;
}
/* total number of attributes checked by the properties code */
#define PPTT_CHECKED_ATTRIBUTES 4
/**
* update_cache_properties() - Update cacheinfo for the given processor
* @this_leaf: Kernel cache info structure being updated
* @found_cache: The PPTT node describing this cache instance
* @cpu_node: A unique reference to describe this cache instance
*
* The ACPI spec implies that the fields in the cache structures are used to
* extend and correct the information probed from the hardware. Lets only
* set fields that we determine are VALID.
*
* Return: nothing. Side effect of updating the global cacheinfo
*/
static void update_cache_properties(struct cacheinfo *this_leaf,
struct acpi_pptt_cache *found_cache,
struct acpi_pptt_processor *cpu_node)
{
int valid_flags = 0;
this_leaf->fw_token = cpu_node;
if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) {
this_leaf->size = found_cache->size;
valid_flags++;
}
if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID) {
this_leaf->coherency_line_size = found_cache->line_size;
valid_flags++;
}
if (found_cache->flags & ACPI_PPTT_NUMBER_OF_SETS_VALID) {
this_leaf->number_of_sets = found_cache->number_of_sets;
valid_flags++;
}
if (found_cache->flags & ACPI_PPTT_ASSOCIATIVITY_VALID) {
this_leaf->ways_of_associativity = found_cache->associativity;
valid_flags++;
}
if (found_cache->flags & ACPI_PPTT_WRITE_POLICY_VALID) {
switch (found_cache->attributes & ACPI_PPTT_MASK_WRITE_POLICY) {
case ACPI_PPTT_CACHE_POLICY_WT:
this_leaf->attributes = CACHE_WRITE_THROUGH;
break;
case ACPI_PPTT_CACHE_POLICY_WB:
this_leaf->attributes = CACHE_WRITE_BACK;
break;
}
}
if (found_cache->flags & ACPI_PPTT_ALLOCATION_TYPE_VALID) {
switch (found_cache->attributes & ACPI_PPTT_MASK_ALLOCATION_TYPE) {
case ACPI_PPTT_CACHE_READ_ALLOCATE:
this_leaf->attributes |= CACHE_READ_ALLOCATE;
break;
case ACPI_PPTT_CACHE_WRITE_ALLOCATE:
this_leaf->attributes |= CACHE_WRITE_ALLOCATE;
break;
case ACPI_PPTT_CACHE_RW_ALLOCATE:
case ACPI_PPTT_CACHE_RW_ALLOCATE_ALT:
this_leaf->attributes |=
CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE;
break;
}
}
/*
* If the above flags are valid, and the cache type is NOCACHE
* update the cache type as well.
*/
if (this_leaf->type == CACHE_TYPE_NOCACHE &&
valid_flags == PPTT_CHECKED_ATTRIBUTES)
this_leaf->type = CACHE_TYPE_UNIFIED;
}
static void cache_setup_acpi_cpu(struct acpi_table_header *table,
unsigned int cpu)
{
struct acpi_pptt_cache *found_cache;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
struct cacheinfo *this_leaf;
unsigned int index = 0;
struct acpi_pptt_processor *cpu_node = NULL;
while (index < get_cpu_cacheinfo(cpu)->num_leaves) {
this_leaf = this_cpu_ci->info_list + index;
found_cache = acpi_find_cache_node(table, acpi_cpu_id,
this_leaf->type,
this_leaf->level,
&cpu_node);
pr_debug("found = %p %p\n", found_cache, cpu_node);
if (found_cache)
update_cache_properties(this_leaf,
found_cache,
cpu_node);
index++;
}
}
/* Passing level values greater than this will result in search termination */
#define PPTT_ABORT_PACKAGE 0xFF
static struct acpi_pptt_processor *acpi_find_processor_package_id(struct acpi_table_header *table_hdr,
struct acpi_pptt_processor *cpu,
int level, int flag)
{
struct acpi_pptt_processor *prev_node;
while (cpu && level) {
if (cpu->flags & flag)
break;
pr_debug("level %d\n", level);
prev_node = fetch_pptt_node(table_hdr, cpu->parent);
if (prev_node == NULL)
break;
cpu = prev_node;
level--;
}
return cpu;
}
/**
* topology_get_acpi_cpu_tag() - Find a unique topology value for a feature
* @table: Pointer to the head of the PPTT table
* @cpu: Kernel logical cpu number
* @level: A level that terminates the search
* @flag: A flag which terminates the search
*
* Get a unique value given a cpu, and a topology level, that can be
* matched to determine which cpus share common topological features
* at that level.
*
* Return: Unique value, or -ENOENT if unable to locate cpu
*/
static int topology_get_acpi_cpu_tag(struct acpi_table_header *table,
unsigned int cpu, int level, int flag)
{
struct acpi_pptt_processor *cpu_node;
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
if (cpu_node) {
cpu_node = acpi_find_processor_package_id(table, cpu_node,
level, flag);
/* Only the first level has a guaranteed id */
if (level == 0)
return cpu_node->acpi_processor_id;
return ACPI_PTR_DIFF(cpu_node, table);
}
pr_warn_once("PPTT table found, but unable to locate core %d (%d)\n",
cpu, acpi_cpu_id);
return -ENOENT;
}
static int find_acpi_cpu_topology_tag(unsigned int cpu, int level, int flag)
{
struct acpi_table_header *table;
acpi_status status;
int retval;
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
pr_warn_once("No PPTT table found, cpu topology may be inaccurate\n");
return -ENOENT;
}
retval = topology_get_acpi_cpu_tag(table, cpu, level, flag);
pr_debug("Topology Setup ACPI cpu %d, level %d ret = %d\n",
cpu, level, retval);
acpi_put_table(table);
return retval;
}
/**
* acpi_find_last_cache_level() - Determines the number of cache levels for a PE
* @cpu: Kernel logical cpu number
*
* Given a logical cpu number, returns the number of levels of cache represented
* in the PPTT. Errors caused by lack of a PPTT table, or otherwise, return 0
* indicating we didn't find any cache levels.
*
* Return: Cache levels visible to this core.
*/
int acpi_find_last_cache_level(unsigned int cpu)
{
u32 acpi_cpu_id;
struct acpi_table_header *table;
int number_of_levels = 0;
acpi_status status;
pr_debug("Cache Setup find last level cpu=%d\n", cpu);
acpi_cpu_id = get_acpi_id_for_cpu(cpu);
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
pr_warn_once("No PPTT table found, cache topology may be inaccurate\n");
} else {
number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id);
acpi_put_table(table);
}
pr_debug("Cache Setup find last level level=%d\n", number_of_levels);
return number_of_levels;
}
/**
* cache_setup_acpi() - Override CPU cache topology with data from the PPTT
* @cpu: Kernel logical cpu number
*
* Updates the global cache info provided by cpu_get_cacheinfo()
* when there are valid properties in the acpi_pptt_cache nodes. A
* successful parse may not result in any updates if none of the
* cache levels have any valid flags set. Futher, a unique value is
* associated with each known CPU cache entry. This unique value
* can be used to determine whether caches are shared between cpus.
*
* Return: -ENOENT on failure to find table, or 0 on success
*/
int cache_setup_acpi(unsigned int cpu)
{
struct acpi_table_header *table;
acpi_status status;
pr_debug("Cache Setup ACPI cpu %d\n", cpu);
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
pr_warn_once("No PPTT table found, cache topology may be inaccurate\n");
return -ENOENT;
}
cache_setup_acpi_cpu(table, cpu);
acpi_put_table(table);
return status;
}
/**
* find_acpi_cpu_topology() - Determine a unique topology value for a given cpu
* @cpu: Kernel logical cpu number
* @level: The topological level for which we would like a unique ID
*
* Determine a topology unique ID for each thread/core/cluster/mc_grouping
* /socket/etc. This ID can then be used to group peers, which will have
* matching ids.
*
* The search terminates when either the requested level is found or
* we reach a root node. Levels beyond the termination point will return the
* same unique ID. The unique id for level 0 is the acpi processor id. All
* other levels beyond this use a generated value to uniquely identify
* a topological feature.
*
* Return: -ENOENT if the PPTT doesn't exist, or the cpu cannot be found.
* Otherwise returns a value which represents a unique topological feature.
*/
int find_acpi_cpu_topology(unsigned int cpu, int level)
{
return find_acpi_cpu_topology_tag(cpu, level, 0);
}
/**
* find_acpi_cpu_cache_topology() - Determine a unique cache topology value
* @cpu: Kernel logical cpu number
* @level: The cache level for which we would like a unique ID
*
* Determine a unique ID for each unified cache in the system
*
* Return: -ENOENT if the PPTT doesn't exist, or the cpu cannot be found.
* Otherwise returns a value which represents a unique topological feature.
*/
int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
{
struct acpi_table_header *table;
struct acpi_pptt_cache *found_cache;
acpi_status status;
u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
struct acpi_pptt_processor *cpu_node = NULL;
int ret = -1;
status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
if (ACPI_FAILURE(status)) {
pr_warn_once("No PPTT table found, topology may be inaccurate\n");
return -ENOENT;
}
found_cache = acpi_find_cache_node(table, acpi_cpu_id,
CACHE_TYPE_UNIFIED,
level,
&cpu_node);
if (found_cache)
ret = ACPI_PTR_DIFF(cpu_node, table);
acpi_put_table(table);
return ret;
}
/**
* find_acpi_cpu_topology_package() - Determine a unique cpu package value
* @cpu: Kernel logical cpu number
*
* Determine a topology unique package ID for the given cpu.
* This ID can then be used to group peers, which will have matching ids.
*
* The search terminates when either a level is found with the PHYSICAL_PACKAGE
* flag set or we reach a root node.
*
* Return: -ENOENT if the PPTT doesn't exist, or the cpu cannot be found.
* Otherwise returns a value which represents the package for this cpu.
*/
int find_acpi_cpu_topology_package(unsigned int cpu)
{
return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE,
ACPI_PPTT_PHYSICAL_PACKAGE);
}

2
drivers/acpi/tables.c
View File

@ -462,7 +462,7 @@ static const char * const table_sigs[] = {
ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
ACPI_SIG_NFIT, ACPI_SIG_HMAT, NULL };
ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL };
#define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)

163
drivers/base/cacheinfo.c
View File

@ -32,50 +32,10 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu)
}
#ifdef CONFIG_OF
static int cache_setup_of_node(unsigned int cpu)
{
struct device_node *np;
struct cacheinfo *this_leaf;
struct device *cpu_dev = get_cpu_device(cpu);
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
unsigned int index = 0;
/* skip if of_node is already populated */
if (this_cpu_ci->info_list->of_node)
return 0;
if (!cpu_dev) {
pr_err("No cpu device for CPU %d\n", cpu);
return -ENODEV;
}
np = cpu_dev->of_node;
if (!np) {
pr_err("Failed to find cpu%d device node\n", cpu);
return -ENOENT;
}
while (index < cache_leaves(cpu)) {
this_leaf = this_cpu_ci->info_list + index;
if (this_leaf->level != 1)
np = of_find_next_cache_node(np);
else
np = of_node_get(np);/* cpu node itself */
if (!np)
break;
this_leaf->of_node = np;
index++;
}
if (index != cache_leaves(cpu)) /* not all OF nodes populated */
return -ENOENT;
return 0;
}
static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
struct cacheinfo *sib_leaf)
{
return sib_leaf->of_node == this_leaf->of_node;
return sib_leaf->fw_token == this_leaf->fw_token;
}
/* OF properties to query for a given cache type */
@ -111,7 +71,7 @@ static inline int get_cacheinfo_idx(enum cache_type type)
return type;
}
static void cache_size(struct cacheinfo *this_leaf)
static void cache_size(struct cacheinfo *this_leaf, struct device_node *np)
{
const char *propname;
const __be32 *cache_size;
@ -120,13 +80,14 @@ static void cache_size(struct cacheinfo *this_leaf)
ct_idx = get_cacheinfo_idx(this_leaf->type);
propname = cache_type_info[ct_idx].size_prop;
cache_size = of_get_property(this_leaf->of_node, propname, NULL);
cache_size = of_get_property(np, propname, NULL);
if (cache_size)
this_leaf->size = of_read_number(cache_size, 1);
}
/* not cache_line_size() because that's a macro in include/linux/cache.h */
static void cache_get_line_size(struct cacheinfo *this_leaf)
static void cache_get_line_size(struct cacheinfo *this_leaf,
struct device_node *np)
{
const __be32 *line_size;
int i, lim, ct_idx;
@ -138,7 +99,7 @@ static void cache_get_line_size(struct cacheinfo *this_leaf)
const char *propname;
propname = cache_type_info[ct_idx].line_size_props[i];
line_size = of_get_property(this_leaf->of_node, propname, NULL);
line_size = of_get_property(np, propname, NULL);
if (line_size)
break;
}
@ -147,7 +108,7 @@ static void cache_get_line_size(struct cacheinfo *this_leaf)
this_leaf->coherency_line_size = of_read_number(line_size, 1);
}
static void cache_nr_sets(struct cacheinfo *this_leaf)
static void cache_nr_sets(struct cacheinfo *this_leaf, struct device_node *np)
{
const char *propname;
const __be32 *nr_sets;
@ -156,7 +117,7 @@ static void cache_nr_sets(struct cacheinfo *this_leaf)
ct_idx = get_cacheinfo_idx(this_leaf->type);
propname = cache_type_info[ct_idx].nr_sets_prop;
nr_sets = of_get_property(this_leaf->of_node, propname, NULL);
nr_sets = of_get_property(np, propname, NULL);
if (nr_sets)
this_leaf->number_of_sets = of_read_number(nr_sets, 1);
}
@ -175,41 +136,77 @@ static void cache_associativity(struct cacheinfo *this_leaf)
this_leaf->ways_of_associativity = (size / nr_sets) / line_size;
}
static bool cache_node_is_unified(struct cacheinfo *this_leaf)
static bool cache_node_is_unified(struct cacheinfo *this_leaf,
struct device_node *np)
{
return of_property_read_bool(this_leaf->of_node, "cache-unified");
return of_property_read_bool(np, "cache-unified");
}
static void cache_of_override_properties(unsigned int cpu)
static void cache_of_set_props(struct cacheinfo *this_leaf,
struct device_node *np)
{
int index;
struct cacheinfo *this_leaf;
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
/*
* init_cache_level must setup the cache level correctly
* overriding the architecturally specified levels, so
* if type is NONE at this stage, it should be unified
*/
if (this_leaf->type == CACHE_TYPE_NOCACHE &&
cache_node_is_unified(this_leaf, np))
this_leaf->type = CACHE_TYPE_UNIFIED;
cache_size(this_leaf, np);
cache_get_line_size(this_leaf, np);
cache_nr_sets(this_leaf, np);
cache_associativity(this_leaf);
}
for (index = 0; index < cache_leaves(cpu); index++) {
this_leaf = this_cpu_ci->info_list + index;
/*
* init_cache_level must setup the cache level correctly
* overriding the architecturally specified levels, so
* if type is NONE at this stage, it should be unified
*/
if (this_leaf->type == CACHE_TYPE_NOCACHE &&
cache_node_is_unified(this_leaf))
this_leaf->type = CACHE_TYPE_UNIFIED;
cache_size(this_leaf);
cache_get_line_size(this_leaf);
cache_nr_sets(this_leaf);
cache_associativity(this_leaf);
static int cache_setup_of_node(unsigned int cpu)
{
struct device_node *np;
struct cacheinfo *this_leaf;
struct device *cpu_dev = get_cpu_device(cpu);
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
unsigned int index = 0;
/* skip if fw_token is already populated */
if (this_cpu_ci->info_list->fw_token) {
return 0;
}
if (!cpu_dev) {
pr_err("No cpu device for CPU %d\n", cpu);
return -ENODEV;
}
np = cpu_dev->of_node;
if (!np) {
pr_err("Failed to find cpu%d device node\n", cpu);
return -ENOENT;
}
while (index < cache_leaves(cpu)) {
this_leaf = this_cpu_ci->info_list + index;
if (this_leaf->level != 1)
np = of_find_next_cache_node(np);
else
np = of_node_get(np);/* cpu node itself */
if (!np)
break;
cache_of_set_props(this_leaf, np);
this_leaf->fw_token = np;
index++;
}
if (index != cache_leaves(cpu)) /* not all OF nodes populated */
return -ENOENT;
return 0;
}
#else
static void cache_of_override_properties(unsigned int cpu) { }
static inline int cache_setup_of_node(unsigned int cpu) { return 0; }
static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
struct cacheinfo *sib_leaf)
{
/*
* For non-DT systems, assume unique level 1 cache, system-wide
* For non-DT/ACPI systems, assume unique level 1 caches, system-wide
* shared caches for all other levels. This will be used only if
* arch specific code has not populated shared_cpu_map
*/
@ -217,6 +214,11 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
}
#endif
int __weak cache_setup_acpi(unsigned int cpu)
{
return -ENOTSUPP;
}
static int cache_shared_cpu_map_setup(unsigned int cpu)
{
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
@ -230,8 +232,8 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
if (of_have_populated_dt())
ret = cache_setup_of_node(cpu);
else if (!acpi_disabled)
/* No cache property/hierarchy support yet in ACPI */
ret = -ENOTSUPP;
ret = cache_setup_acpi(cpu);
if (ret)
return ret;
@ -282,16 +284,11 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
}
of_node_put(this_leaf->of_node);
if (of_have_populated_dt())
of_node_put(this_leaf->fw_token);
}
}
static void cache_override_properties(unsigned int cpu)
{
if (of_have_populated_dt())
return cache_of_override_properties(cpu);
}
static void free_cache_attributes(unsigned int cpu)
{
if (!per_cpu_cacheinfo(cpu))
@ -325,12 +322,17 @@ static int detect_cache_attributes(unsigned int cpu)
if (per_cpu_cacheinfo(cpu) == NULL)
return -ENOMEM;
/*
* populate_cache_leaves() may completely setup the cache leaves and
* shared_cpu_map or it may leave it partially setup.
*/
ret = populate_cache_leaves(cpu);
if (ret)
goto free_ci;
/*
* For systems using DT for cache hierarchy, of_node and shared_cpu_map
* will be set up here only if they are not populated already
* For systems using DT for cache hierarchy, fw_token
* and shared_cpu_map will be set up here only if they are
* not populated already
*/
ret = cache_shared_cpu_map_setup(cpu);
if (ret) {
@ -338,7 +340,6 @@ static int detect_cache_attributes(unsigned int cpu)
goto free_ci;
}
cache_override_properties(cpu);
return 0;
free_ci:

36
drivers/perf/Kconfig
View File

@ -6,30 +6,32 @@ menu "Performance monitor support"
depends on PERF_EVENTS
config ARM_CCI_PMU
bool
tristate "ARM CCI PMU driver"
depends on (ARM && CPU_V7) || ARM64
select ARM_CCI
help
Support for PMU events monitoring on the ARM CCI (Cache Coherent
Interconnect) family of products.
If compiled as a module, it will be called arm-cci.
config ARM_CCI400_PMU
bool "ARM CCI400 PMU support"
depends on (ARM && CPU_V7) || ARM64
bool "support CCI-400"
default y
depends on ARM_CCI_PMU
select ARM_CCI400_COMMON
select ARM_CCI_PMU
help
Support for PMU events monitoring on the ARM CCI-400 (cache coherent
interconnect). CCI-400 supports counting events related to the
connected slave/master interfaces.
CCI-400 provides 4 independent event counters counting events related
to the connected slave/master interfaces, plus a cycle counter.
config ARM_CCI5xx_PMU
bool "ARM CCI-500/CCI-550 PMU support"
depends on (ARM && CPU_V7) || ARM64
select ARM_CCI_PMU
bool "support CCI-500/CCI-550"
default y
depends on ARM_CCI_PMU
help
Support for PMU events monitoring on the ARM CCI-500/CCI-550 cache
coherent interconnects. Both of them provide 8 independent event counters,
which can count events pertaining to the slave/master interfaces as well
as the internal events to the CCI.
If unsure, say Y
CCI-500/CCI-550 both provide 8 independent event counters, which can
count events pertaining to the slave/master interfaces as well as the
internal events to the CCI.
config ARM_CCN
tristate "ARM CCN driver support"
@ -94,7 +96,7 @@ config XGENE_PMU
config ARM_SPE_PMU
tristate "Enable support for the ARMv8.2 Statistical Profiling Extension"
depends on PERF_EVENTS && ARM64
depends on ARM64
help
Enable perf support for the ARMv8.2 Statistical Profiling
Extension, which provides periodic sampling of operations in

47
drivers/perf/arm-cci.c
View File

@ -120,9 +120,9 @@ enum cci_models {
static void pmu_write_counters(struct cci_pmu *cci_pmu,
unsigned long *mask);
static ssize_t cci_pmu_format_show(struct device *dev,
static ssize_t __maybe_unused cci_pmu_format_show(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t cci_pmu_event_show(struct device *dev,
static ssize_t __maybe_unused cci_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
#define CCI_EXT_ATTR_ENTRY(_name, _func, _config) \
@ -1184,16 +1184,11 @@ static int cci_pmu_add(struct perf_event *event, int flags)
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx;
int err = 0;
perf_pmu_disable(event->pmu);
/* If we don't have a space for the counter then finish early. */
idx = pmu_get_event_idx(hw_events, event);
if (idx < 0) {
err = idx;
goto out;
}
if (idx < 0)
return idx;
event->hw.idx = idx;
hw_events->events[idx] = event;
@ -1205,9 +1200,7 @@ static int cci_pmu_add(struct perf_event *event, int flags)
/* Propagate our changes to the userspace mapping. */
perf_event_update_userpage(event);
out:
perf_pmu_enable(event->pmu);
return err;
return 0;
}
static void cci_pmu_del(struct perf_event *event, int flags)
@ -1304,15 +1297,6 @@ static int __hw_perf_event_init(struct perf_event *event)
*/
hwc->config_base |= (unsigned long)mapping;
/*
* Limit the sample_period to half of the counter width. That way, the
* new counter value is far less likely to overtake the previous one
* unless you have some serious IRQ latency issues.
*/
hwc->sample_period = CCI_PMU_CNTR_MASK >> 1;
hwc->last_period = hwc->sample_period;
local64_set(&hwc->period_left, hwc->sample_period);
if (event->group_leader != event) {
if (validate_group(event) != 0)
return -EINVAL;
@ -1423,6 +1407,7 @@ static int cci_pmu_init(struct cci_pmu *cci_pmu, struct platform_device *pdev)
pmu_format_attr_group.attrs = model->format_attrs;
cci_pmu->pmu = (struct pmu) {
.module = THIS_MODULE,
.name = cci_pmu->model->name,
.task_ctx_nr = perf_invalid_context,
.pmu_enable = cci_pmu_enable,
@ -1466,7 +1451,7 @@ static int cci_pmu_offline_cpu(unsigned int cpu)
return 0;
}
static struct cci_pmu_model cci_pmu_models[] = {
static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
#ifdef CONFIG_ARM_CCI400_PMU
[CCI400_R0] = {
.name = "CCI_400",
@ -1588,6 +1573,7 @@ static const struct of_device_id arm_cci_pmu_matches[] = {
#endif
{},
};
MODULE_DEVICE_TABLE(of, arm_cci_pmu_matches);
static bool is_duplicate_irq(int irq, int *irqs, int nr_irqs)
{
@ -1709,14 +1695,27 @@ static int cci_pmu_probe(struct platform_device *pdev)
return 0;
}
static int cci_pmu_remove(struct platform_device *pdev)
{
if (!g_cci_pmu)
return 0;
cpuhp_remove_state(CPUHP_AP_PERF_ARM_CCI_ONLINE);
perf_pmu_unregister(&g_cci_pmu->pmu);
g_cci_pmu = NULL;
return 0;
}
static struct platform_driver cci_pmu_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = arm_cci_pmu_matches,
},
.probe = cci_pmu_probe,
.remove = cci_pmu_remove,
};
builtin_platform_driver(cci_pmu_driver);
MODULE_LICENSE("GPL");
module_platform_driver(cci_pmu_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ARM CCI PMU support");

22
drivers/perf/arm-ccn.c
View File

@ -736,7 +736,7 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
ccn = pmu_to_arm_ccn(event->pmu);
if (hw->sample_period) {
dev_warn(ccn->dev, "Sampling not supported!\n");
dev_dbg(ccn->dev, "Sampling not supported!\n");
return -EOPNOTSUPP;
}
@ -744,12 +744,12 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
event->attr.exclude_kernel || event->attr.exclude_hv ||
event->attr.exclude_idle || event->attr.exclude_host ||
event->attr.exclude_guest) {
dev_warn(ccn->dev, "Can't exclude execution levels!\n");
dev_dbg(ccn->dev, "Can't exclude execution levels!\n");
return -EINVAL;
}
if (event->cpu < 0) {
dev_warn(ccn->dev, "Can't provide per-task data!\n");
dev_dbg(ccn->dev, "Can't provide per-task data!\n");
return -EOPNOTSUPP;
}
/*
@ -771,13 +771,13 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
switch (type) {
case CCN_TYPE_MN:
if (node_xp != ccn->mn_id) {
dev_warn(ccn->dev, "Invalid MN ID %d!\n", node_xp);
dev_dbg(ccn->dev, "Invalid MN ID %d!\n", node_xp);
return -EINVAL;
}
break;
case CCN_TYPE_XP:
if (node_xp >= ccn->num_xps) {
dev_warn(ccn->dev, "Invalid XP ID %d!\n", node_xp);
dev_dbg(ccn->dev, "Invalid XP ID %d!\n", node_xp);
return -EINVAL;
}
break;
@ -785,11 +785,11 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
break;
default:
if (node_xp >= ccn->num_nodes) {
dev_warn(ccn->dev, "Invalid node ID %d!\n", node_xp);
dev_dbg(ccn->dev, "Invalid node ID %d!\n", node_xp);
return -EINVAL;
}
if (!arm_ccn_pmu_type_eq(type, ccn->node[node_xp].type)) {
dev_warn(ccn->dev, "Invalid type 0x%x for node %d!\n",
dev_dbg(ccn->dev, "Invalid type 0x%x for node %d!\n",
type, node_xp);
return -EINVAL;
}
@ -808,19 +808,19 @@ static int arm_ccn_pmu_event_init(struct perf_event *event)
if (event_id != e->event)
continue;
if (e->num_ports && port >= e->num_ports) {
dev_warn(ccn->dev, "Invalid port %d for node/XP %d!\n",
dev_dbg(ccn->dev, "Invalid port %d for node/XP %d!\n",
port, node_xp);
return -EINVAL;
}
if (e->num_vcs && vc >= e->num_vcs) {
dev_warn(ccn->dev, "Invalid vc %d for node/XP %d!\n",
dev_dbg(ccn->dev, "Invalid vc %d for node/XP %d!\n",
vc, node_xp);
return -EINVAL;
}
valid = 1;
}
if (!valid) {
dev_warn(ccn->dev, "Invalid event 0x%x for node/XP %d!\n",
dev_dbg(ccn->dev, "Invalid event 0x%x for node/XP %d!\n",
event_id, node_xp);
return -EINVAL;
}
@ -1594,4 +1594,4 @@ module_init(arm_ccn_init);
module_exit(arm_ccn_exit);
MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
MODULE_LICENSE("GPL");
MODULE_LICENSE("GPL v2");

2
drivers/perf/arm_pmu.c
View File

@ -339,7 +339,7 @@ static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
return IRQ_NONE;
start_clock = sched_clock();
ret = armpmu->handle_irq(irq, armpmu);
ret = armpmu->handle_irq(armpmu);
finish_clock = sched_clock();
perf_sample_event_took(finish_clock - start_clock);

6
drivers/perf/arm_spe_pmu.c
View File

@ -131,8 +131,7 @@ static ssize_t arm_spe_pmu_cap_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
struct arm_spe_pmu *spe_pmu = platform_get_drvdata(pdev);
struct arm_spe_pmu *spe_pmu = dev_get_drvdata(dev);
struct dev_ext_attribute *ea =
container_of(attr, struct dev_ext_attribute, attr);
int cap = (long)ea->var;
@ -247,8 +246,7 @@ static ssize_t arm_spe_pmu_get_attr_cpumask(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
struct arm_spe_pmu *spe_pmu = platform_get_drvdata(pdev);
struct arm_spe_pmu *spe_pmu = dev_get_drvdata(dev);
return cpumap_print_to_pagebuf(true, buf, &spe_pmu->supported_cpus);
}

19
include/linux/acpi.h
View File

@ -1299,4 +1299,23 @@ static inline int lpit_read_residency_count_address(u64 *address)
}
#endif
#ifdef CONFIG_ACPI_PPTT
int find_acpi_cpu_topology(unsigned int cpu, int level);
int find_acpi_cpu_topology_package(unsigned int cpu);
int find_acpi_cpu_cache_topology(unsigned int cpu, int level);
#else
static inline int find_acpi_cpu_topology(unsigned int cpu, int level)
{
return -EINVAL;
}
static inline int find_acpi_cpu_topology_package(unsigned int cpu)
{
return -EINVAL;
}
static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
{
return -EINVAL;
}
#endif
#endif /*_LINUX_ACPI_H*/

10
include/linux/arm-smccc.h
View File

@ -80,6 +80,11 @@
ARM_SMCCC_SMC_32, \
0, 0x8000)
#define ARM_SMCCC_ARCH_WORKAROUND_2 \
ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, \
ARM_SMCCC_SMC_32, \
0, 0x7fff)
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
@ -291,5 +296,10 @@ asmlinkage void __arm_smccc_hvc(unsigned long a0, unsigned long a1,
*/
#define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__)
/* Return codes defined in ARM DEN 0070A */
#define SMCCC_RET_SUCCESS 0
#define SMCCC_RET_NOT_SUPPORTED -1
#define SMCCC_RET_NOT_REQUIRED -2
#endif /*__ASSEMBLY__*/
#endif /*__LINUX_ARM_SMCCC_H*/

25
include/linux/cacheinfo.h
View File

@ -34,9 +34,8 @@ enum cache_type {
* @shared_cpu_map: logical cpumask representing all the cpus sharing
* this cache node
* @attributes: bitfield representing various cache attributes
* @of_node: if devicetree is used, this represents either the cpu node in
* case there's no explicit cache node or the cache node itself in the
* device tree
* @fw_token: Unique value used to determine if different cacheinfo
* structures represent a single hardware cache instance.
* @disable_sysfs: indicates whether this node is visible to the user via
* sysfs or not
* @priv: pointer to any private data structure specific to particular
@ -65,8 +64,7 @@ struct cacheinfo {
#define CACHE_ALLOCATE_POLICY_MASK \
(CACHE_READ_ALLOCATE | CACHE_WRITE_ALLOCATE)
#define CACHE_ID BIT(4)
struct device_node *of_node;
void *fw_token;
bool disable_sysfs;
void *priv;
};
@ -99,6 +97,23 @@ int func(unsigned int cpu) \
struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
int init_cache_level(unsigned int cpu);
int populate_cache_leaves(unsigned int cpu);
int cache_setup_acpi(unsigned int cpu);
#ifndef CONFIG_ACPI_PPTT
/*
* acpi_find_last_cache_level is only called on ACPI enabled
* platforms using the PPTT for topology. This means that if
* the platform supports other firmware configuration methods
* we need to stub out the call when ACPI is disabled.
* ACPI enabled platforms not using PPTT won't be making calls
* to this function so we need not worry about them.
*/
static inline int acpi_find_last_cache_level(unsigned int cpu)
{
return 0;
}
#else
int acpi_find_last_cache_level(unsigned int cpu);
#endif
const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);

2
include/linux/perf/arm_pmu.h
View File

@ -78,7 +78,7 @@ struct arm_pmu {
struct pmu pmu;
cpumask_t supported_cpus;
char *name;
irqreturn_t (*handle_irq)(int irq_num, void *dev);
irqreturn_t (*handle_irq)(struct arm_pmu *pmu);
void (*enable)(struct perf_event *event);
void (*disable)(struct perf_event *event);
int (*get_event_idx)(struct pmu_hw_events *hw_events,

4
virt/kvm/arm/arm.c
View File

@ -1490,6 +1490,10 @@ static int init_hyp_mode(void)
}
}
err = hyp_map_aux_data();
if (err)
kvm_err("Cannot map host auxilary data: %d\n", err);
return 0;
out_err:

18
virt/kvm/arm/psci.c
View File

@ -405,7 +405,7 @@ static int kvm_psci_call(struct kvm_vcpu *vcpu)
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
{
u32 func_id = smccc_get_function(vcpu);
u32 val = PSCI_RET_NOT_SUPPORTED;
u32 val = SMCCC_RET_NOT_SUPPORTED;
u32 feature;
switch (func_id) {
@ -417,7 +417,21 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
switch(feature) {
case ARM_SMCCC_ARCH_WORKAROUND_1:
if (kvm_arm_harden_branch_predictor())
val = 0;
val = SMCCC_RET_SUCCESS;
break;
case ARM_SMCCC_ARCH_WORKAROUND_2:
switch (kvm_arm_have_ssbd()) {
case KVM_SSBD_FORCE_DISABLE:
case KVM_SSBD_UNKNOWN:
break;
case KVM_SSBD_KERNEL:
val = SMCCC_RET_SUCCESS;
break;
case KVM_SSBD_FORCE_ENABLE:
case KVM_SSBD_MITIGATED:
val = SMCCC_RET_NOT_REQUIRED;
break;
}
break;
}
break;