diff options
Diffstat (limited to 'arch/s390')
37 files changed, 1182 insertions, 327 deletions
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c index bc48fe82d949..6e7f01ca53e6 100644 --- a/arch/s390/boot/startup.c +++ b/arch/s390/boot/startup.c @@ -10,11 +10,14 @@ #include <asm/sclp.h> #include <asm/diag.h> #include <asm/uv.h> +#include <asm/abs_lowcore.h> #include "decompressor.h" #include "boot.h" #include "uv.h" unsigned long __bootdata_preserved(__kaslr_offset); +unsigned long __bootdata_preserved(__abs_lowcore); +unsigned long __bootdata_preserved(__memcpy_real_area); unsigned long __bootdata(__amode31_base); unsigned long __bootdata_preserved(VMALLOC_START); unsigned long __bootdata_preserved(VMALLOC_END); @@ -180,7 +183,10 @@ static void setup_kernel_memory_layout(void) /* force vmalloc and modules below kasan shadow */ vmax = min(vmax, KASAN_SHADOW_START); #endif - MODULES_END = vmax; + __memcpy_real_area = round_down(vmax - PAGE_SIZE, PAGE_SIZE); + __abs_lowcore = round_down(__memcpy_real_area - ABS_LOWCORE_MAP_SIZE, + sizeof(struct lowcore)); + MODULES_END = round_down(__abs_lowcore, _SEGMENT_SIZE); MODULES_VADDR = MODULES_END - MODULES_LEN; VMALLOC_END = MODULES_VADDR; diff --git a/arch/s390/include/asm/abs_lowcore.h b/arch/s390/include/asm/abs_lowcore.h new file mode 100644 index 000000000000..4c61b14ee928 --- /dev/null +++ b/arch/s390/include/asm/abs_lowcore.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_ABS_LOWCORE_H +#define _ASM_S390_ABS_LOWCORE_H + +#include <asm/lowcore.h> + +#define ABS_LOWCORE_MAP_SIZE (NR_CPUS * sizeof(struct lowcore)) + +extern unsigned long __abs_lowcore; +extern bool abs_lowcore_mapped; + +struct lowcore *get_abs_lowcore(unsigned long *flags); +void put_abs_lowcore(struct lowcore *lc, unsigned long flags); +int abs_lowcore_map(int cpu, struct lowcore *lc, bool alloc); +void abs_lowcore_unmap(int cpu); + +#endif /* _ASM_S390_ABS_LOWCORE_H */ diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h index d4e90f2ba77e..bd1596810cc1 100644 --- a/arch/s390/include/asm/ccwdev.h +++ b/arch/s390/include/asm/ccwdev.h @@ -214,7 +214,6 @@ extern struct ccw_device *ccw_device_create_console(struct ccw_driver *); extern void ccw_device_destroy_console(struct ccw_device *); extern int ccw_device_enable_console(struct ccw_device *); extern void ccw_device_wait_idle(struct ccw_device *); -extern int ccw_device_force_console(struct ccw_device *); extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size); extern void ccw_device_dma_free(struct ccw_device *cdev, diff --git a/arch/s390/include/asm/ctl_reg.h b/arch/s390/include/asm/ctl_reg.h index 267a8f88e143..adf7d8cdac7e 100644 --- a/arch/s390/include/asm/ctl_reg.h +++ b/arch/s390/include/asm/ctl_reg.h @@ -95,7 +95,8 @@ union ctlreg0 { Interruption-Filtering Override */ unsigned long : 3; unsigned long ccc : 1; /* Cryptography counter control */ - unsigned long : 18; + unsigned long pec : 1; /* PAI extension control */ + unsigned long : 17; unsigned long : 3; unsigned long lap : 1; /* Low-address-protection control */ unsigned long : 4; diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 26fe5e535728..8aa1f6530a3e 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -203,7 +203,9 @@ struct lowcore { __u8 pad_0x1400[0x1500-0x1400]; /* 0x1400 */ /* Cryptography-counter designation */ __u64 ccd; /* 0x1500 */ - __u8 pad_0x1508[0x1800-0x1508]; /* 0x1508 */ + /* AI-extension counter designation */ + __u64 aicd; /* 0x1508 */ + __u8 pad_0x1510[0x1800-0x1510]; /* 0x1510 */ /* Transaction abort diagnostic block */ struct pgm_tdb pgm_tdb; /* 0x1800 */ diff --git a/arch/s390/include/asm/maccess.h b/arch/s390/include/asm/maccess.h new file mode 100644 index 000000000000..c7fa838cf6b9 --- /dev/null +++ b/arch/s390/include/asm/maccess.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_S390_MACCESS_H +#define __ASM_S390_MACCESS_H + +#include <linux/types.h> + +struct iov_iter; + +extern unsigned long __memcpy_real_area; +void memcpy_real_init(void); +size_t memcpy_real_iter(struct iov_iter *iter, unsigned long src, size_t count); +int memcpy_real(void *dest, unsigned long src, size_t count); +#ifdef CONFIG_CRASH_DUMP +int copy_oldmem_kernel(void *dst, unsigned long src, size_t count); +#endif + +#endif /* __ASM_S390_MACCESS_H */ diff --git a/arch/s390/include/asm/os_info.h b/arch/s390/include/asm/os_info.h index 85248d8fee0c..0d1c74a7a650 100644 --- a/arch/s390/include/asm/os_info.h +++ b/arch/s390/include/asm/os_info.h @@ -41,20 +41,6 @@ u32 os_info_csum(struct os_info *os_info); #ifdef CONFIG_CRASH_DUMP void *os_info_old_entry(int nr, unsigned long *size); -size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count); - -static inline int copy_oldmem_kernel(void *dst, unsigned long src, size_t count) -{ - struct iov_iter iter; - struct kvec kvec; - - kvec.iov_base = dst; - kvec.iov_len = count; - iov_iter_kvec(&iter, WRITE, &kvec, 1, count); - if (copy_oldmem_iter(&iter, src, count) < count) - return -EFAULT; - return 0; -} #else static inline void *os_info_old_entry(int nr, unsigned long *size) { diff --git a/arch/s390/include/asm/pai.h b/arch/s390/include/asm/pai.h index 5b7e33ac6f0b..1a8a6b15d121 100644 --- a/arch/s390/include/asm/pai.h +++ b/arch/s390/include/asm/pai.h @@ -17,7 +17,9 @@ struct qpaci_info_block { struct { u64 : 8; u64 num_cc : 8; /* # of supported crypto counters */ - u64 : 48; + u64 : 9; + u64 num_nnpa : 7; /* # of supported NNPA counters */ + u64 : 32; }; }; @@ -42,6 +44,8 @@ static inline int qpaci(struct qpaci_info_block *info) #define PAI_CRYPTO_BASE 0x1000 /* First event number */ #define PAI_CRYPTO_MAXCTR 256 /* Max # of event counters */ #define PAI_CRYPTO_KERNEL_OFFSET 2048 +#define PAI_NNPA_BASE 0x1800 /* First event number */ +#define PAI_NNPA_MAXCTR 128 /* Max # of event counters */ DECLARE_STATIC_KEY_FALSE(pai_key); diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 7b4cdadbc023..108e732d7b14 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -117,7 +117,6 @@ struct zpci_bus { struct zpci_dev { struct zpci_bus *zbus; struct list_head entry; /* list of all zpci_devices, needed for hotplug, etc. */ - struct list_head bus_next; struct kref kref; struct hotplug_slot hotplug_slot; diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index f019df19884d..f1cb9391190d 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1777,6 +1777,10 @@ static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) extern int vmem_add_mapping(unsigned long start, unsigned long size); extern void vmem_remove_mapping(unsigned long start, unsigned long size); +extern int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc); +extern int vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot); +extern void vmem_unmap_4k_page(unsigned long addr); +extern pte_t *vmem_get_alloc_pte(unsigned long addr, bool alloc); extern int s390_enable_sie(void); extern int s390_enable_skey(void); extern void s390_reset_cmma(struct mm_struct *mm); diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index bd66f8e34949..4eb9b7875e13 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -306,23 +306,6 @@ static __always_inline void __noreturn disabled_wait(void) #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL -extern int memcpy_real(void *, unsigned long, size_t); -extern void memcpy_absolute(void *, void *, size_t); - -#define put_abs_lowcore(member, x) do { \ - unsigned long __abs_address = offsetof(struct lowcore, member); \ - __typeof__(((struct lowcore *)0)->member) __tmp = (x); \ - \ - memcpy_absolute(__va(__abs_address), &__tmp, sizeof(__tmp)); \ -} while (0) - -#define get_abs_lowcore(x, member) do { \ - unsigned long __abs_address = offsetof(struct lowcore, member); \ - __typeof__(((struct lowcore *)0)->member) *__ptr = &(x); \ - \ - memcpy_absolute(__ptr, __va(__abs_address), sizeof(*__ptr)); \ -} while (0) - extern int s390_isolate_bp(void); extern int s390_isolate_bp_guest(void); diff --git a/arch/s390/include/asm/scsw.h b/arch/s390/include/asm/scsw.h index 7ce584aff5bb..322bdcd4b616 100644 --- a/arch/s390/include/asm/scsw.h +++ b/arch/s390/include/asm/scsw.h @@ -215,6 +215,11 @@ union scsw { #define SNS2_ENV_DATA_PRESENT 0x10 #define SNS2_INPRECISE_END 0x04 +/* + * architectured values for PPRC errors + */ +#define SNS7_INVALID_ON_SEC 0x0e + /** * scsw_is_tm - check for transport mode scsw * @scsw: pointer to scsw diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 7f5d4763357b..73ed2781073b 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -30,7 +30,8 @@ extern void smp_emergency_stop(void); extern int smp_find_processor_id(u16 address); extern int smp_store_status(int cpu); -extern void smp_save_dump_cpus(void); +extern void smp_save_dump_ipl_cpu(void); +extern void smp_save_dump_secondary_cpus(void); extern void smp_yield_cpu(int cpu); extern void smp_cpu_set_polarization(int cpu, int val); extern int smp_cpu_get_polarization(int cpu); @@ -58,6 +59,7 @@ static inline void smp_cpus_done(unsigned int max_cpus) { } +extern int smp_reinit_ipl_cpu(void); extern int smp_rescan_cpus(void); extern void __noreturn cpu_die(void); extern void __cpu_die(unsigned int cpu); diff --git a/arch/s390/include/asm/termios.h b/arch/s390/include/asm/termios.h deleted file mode 100644 index 46fa3020b41e..000000000000 --- a/arch/s390/include/asm/termios.h +++ /dev/null @@ -1,26 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * S390 version - * - * Derived from "include/asm-i386/termios.h" - */ -#ifndef _S390_TERMIOS_H -#define _S390_TERMIOS_H - -#include <uapi/asm/termios.h> - - -/* intr=^C quit=^\ erase=del kill=^U - eof=^D vtime=\0 vmin=\1 sxtc=\0 - start=^Q stop=^S susp=^Z eol=\0 - reprint=^R discard=^U werase=^W lnext=^V - eol2=\0 -*/ -#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0" - -#define user_termios_to_kernel_termios(k, u) copy_from_user(k, u, sizeof(struct termios2)) -#define kernel_termios_to_user_termios(u, k) copy_to_user(u, k, sizeof(struct termios2)) - -#include <asm-generic/termios-base.h> - -#endif /* _S390_TERMIOS_H */ diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h index 9ec86fae9980..93d1ccd3304c 100644 --- a/arch/s390/include/uapi/asm/dasd.h +++ b/arch/s390/include/uapi/asm/dasd.h @@ -183,6 +183,18 @@ typedef struct format_data_t { } format_data_t; /* + * struct dasd_copypair_swap_data_t + * represents all data necessary to issue a swap of the copy pair relation + */ +struct dasd_copypair_swap_data_t { + char primary[20]; /* BUSID of primary */ + char secondary[20]; /* BUSID of secondary */ + + /* Reserved for future updates. */ + __u8 reserved[64]; +}; + +/* * values to be used for format_data_t.intensity * 0/8: normal format * 1/9: also write record zero @@ -326,6 +338,8 @@ struct dasd_snid_ioctl_data { #define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t) /* Release Allocated Space */ #define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t) +/* Swap copy pair relation */ +#define BIODASDCOPYPAIRSWAP _IOW(DASD_IOCTL_LETTER, 4, struct dasd_copypair_swap_data_t) /* Get Sense Path Group ID (SNID) data */ #define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data) diff --git a/arch/s390/include/uapi/asm/termios.h b/arch/s390/include/uapi/asm/termios.h deleted file mode 100644 index 54223169c806..000000000000 --- a/arch/s390/include/uapi/asm/termios.h +++ /dev/null @@ -1,50 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ -/* - * S390 version - * - * Derived from "include/asm-i386/termios.h" - */ - -#ifndef _UAPI_S390_TERMIOS_H -#define _UAPI_S390_TERMIOS_H - -#include <asm/termbits.h> -#include <asm/ioctls.h> - -struct winsize { - unsigned short ws_row; - unsigned short ws_col; - unsigned short ws_xpixel; - unsigned short ws_ypixel; -}; - -#define NCC 8 -struct termio { - unsigned short c_iflag; /* input mode flags */ - unsigned short c_oflag; /* output mode flags */ - unsigned short c_cflag; /* control mode flags */ - unsigned short c_lflag; /* local mode flags */ - unsigned char c_line; /* line discipline */ - unsigned char c_cc[NCC]; /* control characters */ -}; - -/* modem lines */ -#define TIOCM_LE 0x001 -#define TIOCM_DTR 0x002 -#define TIOCM_RTS 0x004 -#define TIOCM_ST 0x008 -#define TIOCM_SR 0x010 -#define TIOCM_CTS 0x020 -#define TIOCM_CAR 0x040 -#define TIOCM_RNG 0x080 -#define TIOCM_DSR 0x100 -#define TIOCM_CD TIOCM_CAR -#define TIOCM_RI TIOCM_RNG -#define TIOCM_OUT1 0x2000 -#define TIOCM_OUT2 0x4000 -#define TIOCM_LOOP 0x8000 - -/* ioctl (fd, TIOCSERGETLSR, &result) where result may be as below */ - - -#endif /* _UAPI_S390_TERMIOS_H */ diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 7ce00816b8df..5e6a23299790 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -40,7 +40,7 @@ obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o -obj-y += smp.o text_amode31.o stacktrace.o +obj-y += smp.o text_amode31.o stacktrace.o abs_lowcore.o extra-y += vmlinux.lds @@ -72,7 +72,7 @@ obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf_common.o obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o -obj-$(CONFIG_PERF_EVENTS) += perf_pai_crypto.o +obj-$(CONFIG_PERF_EVENTS) += perf_pai_crypto.o perf_pai_ext.o obj-$(CONFIG_TRACEPOINTS) += trace.o obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) += uv.o diff --git a/arch/s390/kernel/abs_lowcore.c b/arch/s390/kernel/abs_lowcore.c new file mode 100644 index 000000000000..fb92e8ed0525 --- /dev/null +++ b/arch/s390/kernel/abs_lowcore.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/pgtable.h> +#include <asm/abs_lowcore.h> + +#define ABS_LOWCORE_UNMAPPED 1 +#define ABS_LOWCORE_LAP_ON 2 +#define ABS_LOWCORE_IRQS_ON 4 + +unsigned long __bootdata_preserved(__abs_lowcore); +bool __ro_after_init abs_lowcore_mapped; + +int abs_lowcore_map(int cpu, struct lowcore *lc, bool alloc) +{ + unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore)); + unsigned long phys = __pa(lc); + int rc, i; + + for (i = 0; i < LC_PAGES; i++) { + rc = __vmem_map_4k_page(addr, phys, PAGE_KERNEL, alloc); + if (rc) { + /* + * Do not unmap allocated page tables in case the + * allocation was not requested. In such a case the + * request is expected coming from an atomic context, + * while the unmap attempt might sleep. + */ + if (alloc) { + for (--i; i >= 0; i--) { + addr -= PAGE_SIZE; + vmem_unmap_4k_page(addr); + } + } + return rc; + } + addr += PAGE_SIZE; + phys += PAGE_SIZE; + } + return 0; +} + +void abs_lowcore_unmap(int cpu) +{ + unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore)); + int i; + + for (i = 0; i < LC_PAGES; i++) { + vmem_unmap_4k_page(addr); + addr += PAGE_SIZE; + } +} + +struct lowcore *get_abs_lowcore(unsigned long *flags) +{ + unsigned long irq_flags; + union ctlreg0 cr0; + int cpu; + + *flags = 0; + cpu = get_cpu(); + if (abs_lowcore_mapped) { + return ((struct lowcore *)__abs_lowcore) + cpu; + } else { + if (cpu != 0) + panic("Invalid unmapped absolute lowcore access\n"); + local_irq_save(irq_flags); + if (!irqs_disabled_flags(irq_flags)) + *flags |= ABS_LOWCORE_IRQS_ON; + __ctl_store(cr0.val, 0, 0); + if (cr0.lap) { + *flags |= ABS_LOWCORE_LAP_ON; + __ctl_clear_bit(0, 28); + } + *flags |= ABS_LOWCORE_UNMAPPED; + return lowcore_ptr[0]; + } +} + +void put_abs_lowcore(struct lowcore *lc, unsigned long flags) +{ + if (abs_lowcore_mapped) { + if (flags) + panic("Invalid mapped absolute lowcore release\n"); + } else { + if (smp_processor_id() != 0) + panic("Invalid mapped absolute lowcore access\n"); + if (!(flags & ABS_LOWCORE_UNMAPPED)) + panic("Invalid unmapped absolute lowcore release\n"); + if (flags & ABS_LOWCORE_LAP_ON) + __ctl_set_bit(0, 28); + if (flags & ABS_LOWCORE_IRQS_ON) + local_irq_enable(); + } + put_cpu(); +} diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index bad8f47fc5d6..dd74fe664ed1 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -21,6 +21,7 @@ #include <asm/elf.h> #include <asm/ipl.h> #include <asm/sclp.h> +#include <asm/maccess.h> #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) @@ -53,8 +54,6 @@ struct save_area { }; static LIST_HEAD(dump_save_areas); -static DEFINE_MUTEX(memcpy_real_mutex); -static char memcpy_real_buf[PAGE_SIZE]; /* * Allocate a save area @@ -116,27 +115,7 @@ void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs) memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128)); } -static size_t copy_to_iter_real(struct iov_iter *iter, unsigned long src, size_t count) -{ - size_t len, copied, res = 0; - - mutex_lock(&memcpy_real_mutex); - while (count) { - len = min(PAGE_SIZE, count); - if (memcpy_real(memcpy_real_buf, src, len)) - break; - copied = copy_to_iter(memcpy_real_buf, len, iter); - count -= copied; - src += copied; - res += copied; - if (copied < len) - break; - } - mutex_unlock(&memcpy_real_mutex); - return res; -} - -size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count) +static size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count) { size_t len, copied, res = 0; @@ -156,7 +135,7 @@ size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count) } else { len = count; } - copied = copy_to_iter_real(iter, src, len); + copied = memcpy_real_iter(iter, src, len); } count -= copied; src += copied; @@ -167,6 +146,19 @@ size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count) return res; } +int copy_oldmem_kernel(void *dst, unsigned long src, size_t count) +{ + struct iov_iter iter; + struct kvec kvec; + + kvec.iov_base = dst; + kvec.iov_len = count; + iov_iter_kvec(&iter, WRITE, &kvec, 1, count); + if (copy_oldmem_iter(&iter, src, count) < count) + return -EFAULT; + return 0; +} + /* * Copy one page from "oldmem" */ diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 4331c7e6e1c0..d7a82066a638 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -250,7 +250,7 @@ static debug_info_t *debug_info_alloc(const char *name, int pages_per_area, rc->level = level; rc->buf_size = buf_size; rc->entry_size = sizeof(debug_entry_t) + buf_size; - strlcpy(rc->name, name, sizeof(rc->name)); + strscpy(rc->name, name, sizeof(rc->name)); memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); memset(rc->debugfs_entries, 0, DEBUG_MAX_VIEWS * sizeof(struct dentry *)); refcount_set(&(rc->ref_count), 0); diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 432c8c987256..6030fdd6997b 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -267,7 +267,7 @@ char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; static void __init setup_boot_command_line(void) { /* copy arch command line */ - strlcpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); + strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); } static void __init check_image_bootable(void) diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 1cc85b8ff42e..325cbf69ebbd 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -29,6 +29,7 @@ #include <asm/sclp.h> #include <asm/checksum.h> #include <asm/debug.h> +#include <asm/abs_lowcore.h> #include <asm/os_info.h> #include <asm/sections.h> #include <asm/boot_data.h> @@ -1642,12 +1643,16 @@ static struct shutdown_action __refdata dump_action = { static void dump_reipl_run(struct shutdown_trigger *trigger) { unsigned long ipib = (unsigned long) reipl_block_actual; + struct lowcore *abs_lc; + unsigned long flags; unsigned int csum; csum = (__force unsigned int) csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0); - put_abs_lowcore(ipib, ipib); - put_abs_lowcore(ipib_checksum, csum); + abs_lc = get_abs_lowcore(&flags); + abs_lc->ipib = ipib; + abs_lc->ipib_checksum = csum; + put_abs_lowcore(abs_lc, flags); dump_run(trigger); } diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index ab761c008f98..4579b42286d5 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -21,6 +21,7 @@ #include <asm/elf.h> #include <asm/asm-offsets.h> #include <asm/cacheflush.h> +#include <asm/abs_lowcore.h> #include <asm/os_info.h> #include <asm/set_memory.h> #include <asm/stacktrace.h> @@ -222,13 +223,18 @@ void machine_kexec_cleanup(struct kimage *image) void arch_crash_save_vmcoreinfo(void) { + struct lowcore *abs_lc; + unsigned long flags; + VMCOREINFO_SYMBOL(lowcore_ptr); VMCOREINFO_SYMBOL(high_memory); VMCOREINFO_LENGTH(lowcore_ptr, NR_CPUS); vmcoreinfo_append_str("SAMODE31=%lx\n", __samode31); vmcoreinfo_append_str("EAMODE31=%lx\n", __eamode31); vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset()); - put_abs_lowcore(vmcore_info, paddr_vmcoreinfo_note()); + abs_lc = get_abs_lowcore(&flags); + abs_lc->vmcore_info = paddr_vmcoreinfo_note(); + put_abs_lowcore(abs_lc, flags); } void machine_shutdown(void) diff --git a/arch/s390/kernel/os_info.c b/arch/s390/kernel/os_info.c index 1acc2e05d70f..ec0bd9457e90 100644 --- a/arch/s390/kernel/os_info.c +++ b/arch/s390/kernel/os_info.c @@ -13,8 +13,9 @@ #include <linux/kernel.h> #include <linux/slab.h> #include <asm/checksum.h> -#include <asm/lowcore.h> +#include <asm/abs_lowcore.h> #include <asm/os_info.h> +#include <asm/maccess.h> #include <asm/asm-offsets.h> /* @@ -57,13 +58,16 @@ void os_info_entry_add(int nr, void *ptr, u64 size) */ void __init os_info_init(void) { - void *ptr = &os_info; + struct lowcore *abs_lc; + unsigned long flags; os_info.version_major = OS_INFO_VERSION_MAJOR; os_info.version_minor = OS_INFO_VERSION_MINOR; os_info.magic = OS_INFO_MAGIC; os_info.csum = os_info_csum(&os_info); - put_abs_lowcore(os_info, __pa(ptr)); + abs_lc = get_abs_lowcore(&flags); + abs_lc->os_info = __pa(&os_info); + put_abs_lowcore(abs_lc, flags); } #ifdef CONFIG_CRASH_DUMP diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index f7dd3c849e68..f043a7ff220b 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -664,6 +664,7 @@ static int cfdiag_push_sample(struct perf_event *event, raw.frag.data = cpuhw->stop; raw.size = raw.frag.size; data.raw = &raw; + data.sample_flags |= PERF_SAMPLE_RAW; } overflow = perf_event_overflow(event, &data, ®s); diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c index b38b4ae01589..6826e2a69a21 100644 --- a/arch/s390/kernel/perf_pai_crypto.c +++ b/arch/s390/kernel/perf_pai_crypto.c @@ -366,6 +366,7 @@ static int paicrypt_push_sample(void) raw.frag.data = cpump->save; raw.size = raw.frag.size; data.raw = &raw; + data.sample_flags |= PERF_SAMPLE_RAW; } overflow = perf_event_overflow(event, &data, ®s); diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c new file mode 100644 index 000000000000..d5c7c1e30c17 --- /dev/null +++ b/arch/s390/kernel/perf_pai_ext.c @@ -0,0 +1,671 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Performance event support - Processor Activity Instrumentation Extension + * Facility + * + * Copyright IBM Corp. 2022 + * Author(s): Thomas Richter <tmricht@linux.ibm.com> + */ +#define KMSG_COMPONENT "pai_ext" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/kernel.h> +#include <linux/kernel_stat.h> +#include <linux/percpu.h> +#include <linux/notifier.h> +#include <linux/init.h> +#include <linux/export.h> +#include <linux/io.h> + +#include <asm/cpu_mcf.h> +#include <asm/ctl_reg.h> +#include <asm/pai.h> +#include <asm/debug.h> + +#define PAIE1_CB_SZ 0x200 /* Size of PAIE1 control block */ +#define PAIE1_CTRBLOCK_SZ 0x400 /* Size of PAIE1 counter blocks */ + +static debug_info_t *paiext_dbg; +static unsigned int paiext_cnt; /* Extracted with QPACI instruction */ + +enum paiext_mode { + PAI_MODE_NONE, + PAI_MODE_SAMPLING, + PAI_MODE_COUNTER, +}; + +struct pai_userdata { + u16 num; + u64 value; +} __packed; + +/* Create the PAI extension 1 control block area. + * The PAI extension control block 1 is pointed to by lowcore + * address 0x1508 for each CPU. This control block is 512 bytes in size + * and requires a 512 byte boundary alignment. + */ +struct paiext_cb { /* PAI extension 1 control block */ + u64 header; /* Not used */ + u64 reserved1; + u64 acc; /* Addr to analytics counter control block */ + u8 reserved2[488]; +} __packed; + +struct paiext_map { + unsigned long *area; /* Area for CPU to store counters */ + struct pai_userdata *save; /* Area to store non-zero counters */ + enum paiext_mode mode; /* Type of event */ + unsigned int active_events; /* # of PAI Extension users */ + unsigned int refcnt; + struct perf_event *event; /* Perf event for sampling */ + struct paiext_cb *paiext_cb; /* PAI extension control block area */ +}; + +struct paiext_mapptr { + struct paiext_map *mapptr; +}; + +static struct paiext_root { /* Anchor to per CPU data */ + int refcnt; /* Overall active events */ + struct paiext_mapptr __percpu *mapptr; +} paiext_root; + +/* Free per CPU data when the last event is removed. */ +static void paiext_root_free(void) +{ + if (!--paiext_root.refcnt) { + free_percpu(paiext_root.mapptr); + paiext_root.mapptr = NULL; + } +} + +/* On initialization of first event also allocate per CPU data dynamically. + * Start with an array of pointers, the array size is the maximum number of + * CPUs possible, which might be larger than the number of CPUs currently + * online. + */ +static int paiext_root_alloc(void) +{ + if (++paiext_root.refcnt == 1) { + /* The memory is already zeroed. */ + paiext_root.mapptr = alloc_percpu(struct paiext_mapptr); + if (!paiext_root.mapptr) { + /* Returing without refcnt adjustment is ok. The + * error code is handled by paiext_alloc() which + * decrements refcnt when an event can not be + * created. + */ + return -ENOMEM; + } + } + return 0; +} + +/* Protects against concurrent increment of sampler and counter member + * increments at the same time and prohibits concurrent execution of + * counting and sampling events. + * Ensures that analytics counter block is deallocated only when the + * sampling and counting on that cpu is zero. + * For details see paiext_alloc(). + */ +static DEFINE_MUTEX(paiext_reserve_mutex); + +/* Free all memory allocated for event counting/sampling setup */ +static void paiext_free(struct paiext_mapptr *mp) +{ + kfree(mp->mapptr->area); + kfree(mp->mapptr->paiext_cb); + kvfree(mp->mapptr->save); + kfree(mp->mapptr); + mp->mapptr = NULL; +} + +/* Release the PMU if event is the last perf event */ +static void paiext_event_destroy(struct perf_event *event) +{ + struct paiext_mapptr *mp = per_cpu_ptr(paiext_root.mapptr, event->cpu); + struct paiext_map *cpump = mp->mapptr; + + mutex_lock(&paiext_reserve_mutex); + cpump->event = NULL; + if (!--cpump->refcnt) /* Last reference gone */ + paiext_free(mp); + paiext_root_free(); + mutex_unlock(&paiext_reserve_mutex); + debug_sprintf_event(paiext_dbg, 4, "%s cpu %d mapptr %p\n", __func__, + event->cpu, mp->mapptr); + +} + +/* Used to avoid races in checking concurrent access of counting and + * sampling for pai_extension events. + * + * Only one instance of event pai_ext/NNPA_ALL/ for sampling is + * allowed and when this event is running, no counting event is allowed. + * Several counting events are allowed in parallel, but no sampling event + * is allowed while one (or more) counting events are running. + * + * This function is called in process context and it is safe to block. + * When the event initialization functions fails, no other call back will + * be invoked. + * + * Allocate the memory for the event. + */ +static int paiext_alloc(struct perf_event_attr *a, struct perf_event *event) +{ + struct paiext_mapptr *mp; + struct paiext_map *cpump; + int rc; + + mutex_lock(&paiext_reserve_mutex); + + rc = paiext_root_alloc(); + if (rc) + goto unlock; + + mp = per_cpu_ptr(paiext_root.mapptr, event->cpu); + cpump = mp->mapptr; + if (!cpump) { /* Paiext_map allocated? */ + rc = -ENOMEM; + cpump = kzalloc(sizeof(*cpump), GFP_KERNEL); + if (!cpump) + goto unlock; + + /* Allocate memory for counter area and counter extraction. + * These are + * - a 512 byte block and requires 512 byte boundary alignment. + * - a 1KB byte block and requires 1KB boundary alignment. + * Only the first counting event has to allocate the area. + * + * Note: This works with commit 59bb47985c1d by default. + * Backporting this to kernels without this commit might + * need adjustment. + */ + mp->mapptr = cpump; + cpump->area = kzalloc(PAIE1_CTRBLOCK_SZ, GFP_KERNEL); + cpump->paiext_cb = kzalloc(PAIE1_CB_SZ, GFP_KERNEL); + cpump->save = kvmalloc_array(paiext_cnt + 1, + sizeof(struct pai_userdata), + GFP_KERNEL); + if (!cpump->save || !cpump->area || !cpump->paiext_cb) { + paiext_free(mp); + goto unlock; + } + cpump->mode = a->sample_period ? PAI_MODE_SAMPLING + : PAI_MODE_COUNTER; + } else { + /* Multiple invocation, check whats active. + * Supported are multiple counter events or only one sampling + * event concurrently at any one time. + */ + if (cpump->mode == PAI_MODE_SAMPLING || + (cpump->mode == PAI_MODE_COUNTER && a->sample_period)) { + rc = -EBUSY; + goto unlock; + } + } + + rc = 0; + cpump->event = event; + ++cpump->refcnt; + +unlock: + if (rc) { + /* Error in allocation of event, decrement anchor. Since + * the event in not created, its destroy() function is never + * invoked. Adjust the reference counter for the anchor. + */ + paiext_root_free(); + } + mutex_unlock(&paiext_reserve_mutex); + /* If rc is non-zero, no increment of counter/sampler was done. */ + return rc; +} + +/* The PAI extension 1 control block supports up to 128 entries. Return + * the index within PAIE1_CB given the event number. Also validate event + * number. + */ +static int paiext_event_valid(struct perf_event *event) +{ + u64 cfg = event->attr.config; + + if (cfg >= PAI_NNPA_BASE && cfg <= PAI_NNPA_BASE + paiext_cnt) { + /* Offset NNPA in paiext_cb */ + event->hw.config_base = offsetof(struct paiext_cb, acc); + return 0; + } + return -EINVAL; +} + +/* Might be called on different CPU than the one the event is intended for. */ +static int paiext_event_init(struct perf_event *event) +{ + struct perf_event_attr *a = &event->attr; + int rc; + + /* PMU pai_ext registered as PERF_TYPE_RAW, check event type */ + if (a->type != PERF_TYPE_RAW && event->pmu->type != a->type) + return -ENOENT; + /* PAI extension event must be valid and in supported range */ + rc = paiext_event_valid(event); + if (rc) + return rc; + /* Allow only CPU wide operation, no process context for now. */ + if (event->hw.target || event->cpu == -1) + return -ENOENT; + /* Allow only event NNPA_ALL for sampling. */ + if (a->sample_period && a->config != PAI_NNPA_BASE) + return -EINVAL; + /* Prohibit exclude_user event selection */ + if (a->exclude_user) + return -EINVAL; + + rc = paiext_alloc(a, event); + if (rc) + return rc; + event->hw.last_tag = 0; + event->destroy = paiext_event_destroy; + + if (a->sample_period) { + a->sample_period = 1; + a->freq = 0; + /* Register for paicrypt_sched_task() to be called */ + event->attach_state |= PERF_ATTACH_SCHED_CB; + /* Add raw data which are the memory mapped counters */ + a->sample_type |= PERF_SAMPLE_RAW; + /* Turn off inheritance */ + a->inherit = 0; + } + + return 0; +} + +static u64 paiext_getctr(struct paiext_map *cpump, int nr) +{ + return cpump->area[nr]; +} + +/* Read the counter values. Return value from location in buffer. For event + * NNPA_ALL sum up all events. + */ +static u64 paiext_getdata(struct perf_event *event) +{ + struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr); + struct paiext_map *cpump = mp->mapptr; + u64 sum = 0; + int i; + + if (event->attr.config != PAI_NNPA_BASE) + return paiext_getctr(cpump, event->attr.config - PAI_NNPA_BASE); + + for (i = 1; i <= paiext_cnt; i++) + sum += paiext_getctr(cpump, i); + + return sum; +} + +static u64 paiext_getall(struct perf_event *event) +{ + return paiext_getdata(event); +} + +static void paiext_read(struct perf_event *event) +{ + u64 prev, new, delta; + + prev = local64_read(&event->hw.prev_count); + new = paiext_getall(event); + local64_set(&event->hw.prev_count, new); + delta = new - prev; + local64_add(delta, &event->count); +} + +static void paiext_start(struct perf_event *event, int flags) +{ + u64 sum; + + if (event->hw.last_tag) + return; + event->hw.last_tag = 1; + sum = paiext_getall(event); /* Get current value */ + local64_set(&event->hw.prev_count, sum); + local64_set(&event->count, 0); +} + +static int paiext_add(struct perf_event *event, int flags) +{ + struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr); + struct paiext_map *cpump = mp->mapptr; + struct paiext_cb *pcb = cpump->paiext_cb; + + if (++cpump->active_events == 1) { + S390_lowcore.aicd = virt_to_phys(cpump->paiext_cb); + pcb->acc = virt_to_phys(cpump->area) | 0x1; + /* Enable CPU instruction lookup for PAIE1 control block */ + __ctl_set_bit(0, 49); + debug_sprintf_event(paiext_dbg, 4, "%s 1508 %llx acc %llx\n", + __func__, S390_lowcore.aicd, pcb->acc); + } + if (flags & PERF_EF_START && !event->attr.sample_period) { + /* Only counting needs initial counter value */ + paiext_start(event, PERF_EF_RELOAD); + } + event->hw.state = 0; + if (event->attr.sample_period) { + cpump->event = event; + perf_sched_cb_inc(event->pmu); + } + return 0; +} + +static void paiext_stop(struct perf_event *event, int flags) +{ + paiext_read(event); + event->hw.state = PERF_HES_STOPPED; +} + +static void paiext_del(struct perf_event *event, int flags) +{ + struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr); + struct paiext_map *cpump = mp->mapptr; + struct paiext_cb *pcb = cpump->paiext_cb; + + if (event->attr.sample_period) + perf_sched_cb_dec(event->pmu); + if (!event->attr.sample_period) { + /* Only counting needs to read counter */ + paiext_stop(event, PERF_EF_UPDATE); + } + if (--cpump->active_events == 0) { + /* Disable CPU instruction lookup for PAIE1 control block */ + __ctl_clear_bit(0, 49); + pcb->acc = 0; + S390_lowcore.aicd = 0; + debug_sprintf_event(paiext_dbg, 4, "%s 1508 %llx acc %llx\n", + __func__, S390_lowcore.aicd, pcb->acc); + } +} + +/* Create raw data and save it in buffer. Returns number of bytes copied. + * Saves only positive counter entries of the form + * 2 bytes: Number of counter + * 8 bytes: Value of counter + */ +static size_t paiext_copy(struct paiext_map *cpump) +{ + struct pai_userdata *userdata = cpump->save; + int i, outidx = 0; + + for (i = 1; i <= paiext_cnt; i++) { + u64 val = paiext_getctr(cpump, i); + + if (val) { + userdata[outidx].num = i; + userdata[outidx].value = val; + outidx++; + } + } + return outidx * sizeof(*userdata); +} + +/* Write sample when one or more counters values are nonzero. + * + * Note: The function paiext_sched_task() and paiext_push_sample() are not + * invoked after function paiext_del() has been called because of function + * perf_sched_cb_dec(). + * The function paiext_sched_task() and paiext_push_sample() are only + * called when sampling is active. Function perf_sched_cb_inc() + * has been invoked to install function paiext_sched_task() as call back + * to run at context switch time (see paiext_add()). + * + * This causes function perf_event_context_sched_out() and + * perf_event_context_sched_in() to check whether the PMU has installed an + * sched_task() callback. That callback is not active after paiext_del() + * returns and has deleted the event on that CPU. + */ +static int paiext_push_sample(void) +{ + struct paiext_mapptr *mp = this_cpu_ptr(paiext_root.mapptr); + struct paiext_map *cpump = mp->mapptr; + struct perf_event *event = cpump->event; + struct perf_sample_data data; + struct perf_raw_record raw; + struct pt_regs regs; + size_t rawsize; + int overflow; + + rawsize = paiext_copy(cpump); + if (!rawsize) /* No incremented counters */ + return 0; + + /* Setup perf sample */ + memset(®s, 0, sizeof(regs)); + memset(&raw, 0, sizeof(raw)); + memset(&data, 0, sizeof(data)); + perf_sample_data_init(&data, 0, event->hw.last_period); + if (event->attr.sample_type & PERF_SAMPLE_TID) { + data.tid_entry.pid = task_tgid_nr(current); + data.tid_entry.tid = task_pid_nr(current); + } + if (event->attr.sample_type & PERF_SAMPLE_TIME) + data.time = event->clock(); + if (event->attr.sample_type & (PERF_SAMPLE_ID | PERF_SAMPLE_IDENTIFIER)) + data.id = event->id; + if (event->attr.sample_type & PERF_SAMPLE_CPU) + data.cpu_entry.cpu = smp_processor_id(); + if (event->attr.sample_type & PERF_SAMPLE_RAW) { + raw.frag.size = rawsize; + raw.frag.data = cpump->save; + raw.size = raw.frag.size; + data.raw = &raw; + } + + overflow = perf_event_overflow(event, &data, ®s); + perf_event_update_userpage(event); + /* Clear lowcore area after read */ + memset(cpump->area, 0, PAIE1_CTRBLOCK_SZ); + return overflow; +} + +/* Called on schedule-in and schedule-out. No access to event structure, + * but for sampling only event NNPA_ALL is allowed. + */ +static void paiext_sched_task(struct perf_event_context *ctx, bool sched_in) +{ + /* We started with a clean page on event installation. So read out + * results on schedule_out and if page was dirty, clear values. + */ + if (!sched_in) + paiext_push_sample(); +} + +/* Attribute definitions for pai extension1 interface. As with other CPU + * Measurement Facilities, there is one attribute per mapped counter. + * The number of mapped counters may vary per machine generation. Use + * the QUERY PROCESSOR ACTIVITY COUNTER INFORMATION (QPACI) instruction + * to determine the number of mapped counters. The instructions returns + * a positive number, which is the highest number of supported counters. + * All counters less than this number are also supported, there are no + * holes. A returned number of zero means no support for mapped counters. + * + * The identification of the counter is a unique number. The chosen range + * is 0x1800 + offset in mapped kernel page. + * All CPU Measurement Facility counters identifiers must be unique and + * the numbers from 0 to 496 are already used for the CPU Measurement + * Counter facility. Number 0x1000 to 0x103e are used for PAI cryptography + * counters. + * Numbers 0xb0000, 0xbc000 and 0xbd000 are already + * used for the CPU Measurement Sampling facility. + */ +PMU_FORMAT_ATTR(event, "config:0-63"); + +static struct attribute *paiext_format_attr[] = { + &format_attr_event.attr, + NULL, +}; + +static struct attribute_group paiext_events_group = { + .name = "events", + .attrs = NULL, /* Filled in attr_event_init() */ +}; + +static struct attribute_group paiext_format_group = { + .name = "format", + .attrs = paiext_format_attr, +}; + +static const struct attribute_group *paiext_attr_groups[] = { + &paiext_events_group, + &paiext_format_group, + NULL, +}; + +/* Performance monitoring unit for mapped counters */ +static struct pmu paiext = { + .task_ctx_nr = perf_invalid_context, + .event_init = paiext_event_init, + .add = paiext_add, + .del = paiext_del, + .start = paiext_start, + .stop = paiext_stop, + .read = paiext_read, + .sched_task = paiext_sched_task, + .attr_groups = paiext_attr_groups, +}; + +/* List of symbolic PAI extension 1 NNPA counter names. */ +static const char * const paiext_ctrnames[] = { + [0] = "NNPA_ALL", + [1] = "NNPA_ADD", + [2] = "NNPA_SUB", + [3] = "NNPA_MUL", + [4] = "NNPA_DIV", + [5] = "NNPA_MIN", + [6] = "NNPA_MAX", + [7] = "NNPA_LOG", + [8] = "NNPA_EXP", + [9] = "NNPA_IBM_RESERVED_9", + [10] = "NNPA_RELU", + [11] = "NNPA_TANH", + [12] = "NNPA_SIGMOID", + [13] = "NNPA_SOFTMAX", + [14] = "NNPA_BATCHNORM", + [15] = "NNPA_MAXPOOL2D", + [16] = "NNPA_AVGPOOL2D", + [17] = "NNPA_LSTMACT", + [18] = "NNPA_GRUACT", + [19] = "NNPA_CONVOLUTION", + [20] = "NNPA_MATMUL_OP", + [21] = "NNPA_MATMUL_OP_BCAST23", + [22] = "NNPA_SMALLBATCH", + [23] = "NNPA_LARGEDIM", + [24] = "NNPA_SMALLTENSOR", + [25] = "NNPA_1MFRAME", + [26] = "NNPA_2GFRAME", + [27] = "NNPA_ACCESSEXCEPT", +}; + +static void __init attr_event_free(struct attribute **attrs, int num) +{ + struct perf_pmu_events_attr *pa; + struct device_attribute *dap; + int i; + + for (i = 0; i < num; i++) { + dap = container_of(attrs[i], struct device_attribute, attr); + pa = container_of(dap, struct perf_pmu_events_attr, attr); + kfree(pa); + } + kfree(attrs); +} + +static int __init attr_event_init_one(struct attribute **attrs, int num) +{ + struct perf_pmu_events_attr *pa; + + pa = kzalloc(sizeof(*pa), GFP_KERNEL); + if (!pa) + return -ENOMEM; + + sysfs_attr_init(&pa->attr.attr); + pa->id = PAI_NNPA_BASE + num; + pa->attr.attr.name = paiext_ctrnames[num]; + pa->attr.attr.mode = 0444; + pa->attr.show = cpumf_events_sysfs_show; + pa->attr.store = NULL; + attrs[num] = &pa->attr.attr; + return 0; +} + +/* Create PMU sysfs event attributes on the fly. */ +static int __init attr_event_init(void) +{ + struct attribute **attrs; + int ret, i; + + attrs = kmalloc_array(ARRAY_SIZE(paiext_ctrnames) + 1, sizeof(*attrs), + GFP_KERNEL); + if (!attrs) + return -ENOMEM; + for (i = 0; i < ARRAY_SIZE(paiext_ctrnames); i++) { + ret = attr_event_init_one(attrs, i); + if (ret) { + attr_event_free(attrs, i - 1); + return ret; + } + } + attrs[i] = NULL; + paiext_events_group.attrs = attrs; + return 0; +} + +static int __init paiext_init(void) +{ + struct qpaci_info_block ib; + int rc = -ENOMEM; + + if (!test_facility(197)) + return 0; + + qpaci(&ib); + paiext_cnt = ib.num_nnpa; + if (paiext_cnt >= PAI_NNPA_MAXCTR) + paiext_cnt = PAI_NNPA_MAXCTR; + if (!paiext_cnt) + return 0; + + rc = attr_event_init(); + if (rc) { + pr_err("Creation of PMU " KMSG_COMPONENT " /sysfs failed\n"); + return rc; + } + + /* Setup s390dbf facility */ + paiext_dbg = debug_register(KMSG_COMPONENT, 2, 256, 128); + if (!paiext_dbg) { + pr_err("Registration of s390dbf " KMSG_COMPONENT " failed\n"); + rc = -ENOMEM; + goto out_init; + } + debug_register_view(paiext_dbg, &debug_sprintf_view); + + rc = perf_pmu_register(&paiext, KMSG_COMPONENT, -1); + if (rc) { + pr_err("Registration of " KMSG_COMPONENT " PMU failed with " + "rc=%i\n", rc); + goto out_pmu; + } + + return 0; + +out_pmu: + debug_unregister_view(paiext_dbg, &debug_sprintf_view); + debug_unregister(paiext_dbg); +out_init: + attr_event_free(paiext_events_group.attrs, + ARRAY_SIZE(paiext_ctrnames) + 1); + return rc; +} + +device_initcall(paiext_init); diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index bbd4bde4f65d..ab19ddb09d65 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -58,7 +58,7 @@ #include <asm/smp.h> #include <asm/mmu_context.h> #include <asm/cpcmd.h> -#include <asm/lowcore.h> +#include <asm/abs_lowcore.h> #include <asm/nmi.h> #include <asm/irq.h> #include <asm/page.h> @@ -74,6 +74,7 @@ #include <asm/alternative.h> #include <asm/nospec-branch.h> #include <asm/mem_detect.h> +#include <asm/maccess.h> #include <asm/uv.h> #include <asm/asm-offsets.h> #include "entry.h" @@ -395,6 +396,7 @@ void __init arch_call_rest_init(void) { unsigned long stack; + smp_reinit_ipl_cpu(); stack = stack_alloc(); if (!stack) panic("Couldn't allocate kernel stack"); @@ -411,8 +413,9 @@ void __init arch_call_rest_init(void) static void __init setup_lowcore_dat_off(void) { unsigned long int_psw_mask = PSW_KERNEL_BITS; + struct lowcore *abs_lc, *lc; unsigned long mcck_stack; - struct lowcore *lc; + unsigned long flags; if (IS_ENABLED(CONFIG_KASAN)) int_psw_mask |= PSW_MASK_DAT; @@ -474,12 +477,14 @@ static void __init setup_lowcore_dat_off(void) lc->restart_data = 0; lc->restart_source = -1U; - put_abs_lowcore(restart_stack, lc->restart_stack); - put_abs_lowcore(restart_fn, lc->restart_fn); - put_abs_lowcore(restart_data, lc->restart_data); - put_abs_lowcore(restart_source, lc->restart_source); - put_abs_lowcore(restart_psw, lc->restart_psw); - put_abs_lowcore(mcesad, lc->mcesad); + abs_lc = get_abs_lowcore(&flags); + abs_lc->restart_stack = lc->restart_stack; + abs_lc->restart_fn = lc->restart_fn; + abs_lc->restart_data = lc->restart_data; + abs_lc->restart_source = lc->restart_source; + abs_lc->restart_psw = lc->restart_psw; + abs_lc->mcesad = lc->mcesad; + put_abs_lowcore(abs_lc, flags); mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); if (!mcck_stack) @@ -500,8 +505,8 @@ static void __init setup_lowcore_dat_off(void) static void __init setup_lowcore_dat_on(void) { - struct lowcore *lc = lowcore_ptr[0]; - int cr; + struct lowcore *abs_lc; + unsigned long flags; __ctl_clear_bit(0, 28); S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; @@ -510,10 +515,15 @@ static void __init setup_lowcore_dat_on(void) S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; __ctl_set_bit(0, 28); __ctl_store(S390_lowcore.cregs_save_area, 0, 15); - put_abs_lowcore(restart_flags, RESTART_FLAG_CTLREGS); - put_abs_lowcore(program_new_psw, lc->program_new_psw); - for (cr = 0; cr < ARRAY_SIZE(lc->cregs_save_area); cr++) - put_abs_lowcore(cregs_save_area[cr], lc->cregs_save_area[cr]); + if (abs_lowcore_map(0, lowcore_ptr[0], true)) + panic("Couldn't setup absolute lowcore"); + abs_lowcore_mapped = true; + abs_lc = get_abs_lowcore(&flags); + abs_lc->restart_flags = RESTART_FLAG_CTLREGS; + abs_lc->program_new_psw = S390_lowcore.program_new_psw; + memcpy(abs_lc->cregs_save_area, S390_lowcore.cregs_save_area, + sizeof(abs_lc->cregs_save_area)); + put_abs_lowcore(abs_lc, flags); } static struct resource code_resource = { @@ -1019,10 +1029,10 @@ void __init setup_arch(char **cmdline_p) reserve_crashkernel(); #ifdef CONFIG_CRASH_DUMP /* - * Be aware that smp_save_dump_cpus() triggers a system reset. + * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. * Therefore CPU and device initialization should be done afterwards. */ - smp_save_dump_cpus(); + smp_save_dump_secondary_cpus(); #endif setup_resources(); @@ -1041,12 +1051,15 @@ void __init setup_arch(char **cmdline_p) * Create kernel page tables and switch to virtual addressing. */ paging_init(); - + memcpy_real_init(); /* * After paging_init created the kernel page table, the new PSWs * in lowcore can now run with DAT enabled. */ setup_lowcore_dat_on(); +#ifdef CONFIG_CRASH_DUMP + smp_save_dump_ipl_cpu(); +#endif /* Setup default console */ conmode_default(); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 30c91d565933..0031325ce4bc 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -45,7 +45,7 @@ #include <asm/irq.h> #include <asm/tlbflush.h> #include <asm/vtimer.h> -#include <asm/lowcore.h> +#include <asm/abs_lowcore.h> #include <asm/sclp.h> #include <asm/debug.h> #include <asm/os_info.h> @@ -55,6 +55,7 @@ #include <asm/stacktrace.h> #include <asm/topology.h> #include <asm/vdso.h> +#include <asm/maccess.h> #include "entry.h" enum { @@ -212,10 +213,14 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu) lc->preempt_count = PREEMPT_DISABLED; if (nmi_alloc_mcesa(&lc->mcesad)) goto out; + if (abs_lowcore_map(cpu, lc, true)) + goto out_mcesa; lowcore_ptr[cpu] = lc; pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, __pa(lc)); return 0; +out_mcesa: + nmi_free_mcesa(&lc->mcesad); out: stack_free(mcck_stack); stack_free(async_stack); @@ -237,6 +242,7 @@ static void pcpu_free_lowcore(struct pcpu *pcpu) mcck_stack = lc->mcck_stack - STACK_INIT_OFFSET; pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, 0); lowcore_ptr[cpu] = NULL; + abs_lowcore_unmap(cpu); nmi_free_mcesa(&lc->mcesad); stack_free(async_stack); stack_free(mcck_stack); @@ -315,9 +321,12 @@ static void pcpu_delegate(struct pcpu *pcpu, pcpu_delegate_fn *func, void *data, unsigned long stack) { - struct lowcore *lc = lowcore_ptr[pcpu - pcpu_devices]; - unsigned int source_cpu = stap(); + struct lowcore *lc, *abs_lc; + unsigned int source_cpu; + unsigned long flags; + lc = lowcore_ptr[pcpu - pcpu_devices]; + source_cpu = stap(); __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_DAT); if (pcpu->address == source_cpu) { call_on_stack(2, stack, void, __pcpu_delegate, @@ -332,10 +341,12 @@ static void pcpu_delegate(struct pcpu *pcpu, lc->restart_data = (unsigned long)data; lc->restart_source = source_cpu; } else { - put_abs_lowcore(restart_stack, stack); - put_abs_lowcore(restart_fn, (unsigned long)func); - put_abs_lowcore(restart_data, (unsigned long)data); - put_abs_lowcore(restart_source, source_cpu); + abs_lc = get_abs_lowcore(&flags); + abs_lc->restart_stack = stack; + abs_lc->restart_fn = (unsigned long)func; + abs_lc->restart_data = (unsigned long)data; + abs_lc->restart_source = source_cpu; + put_abs_lowcore(abs_lc, flags); } __bpon(); asm volatile( @@ -581,6 +592,8 @@ static DEFINE_SPINLOCK(ctl_lock); void smp_ctl_set_clear_bit(int cr, int bit, bool set) { struct ec_creg_mask_parms parms = { .cr = cr, }; + struct lowcore *abs_lc; + unsigned long flags; u64 ctlreg; if (set) { @@ -591,9 +604,11 @@ void smp_ctl_set_clear_bit(int cr, int bit, bool set) parms.andval = ~(1UL << bit); } spin_lock(&ctl_lock); - get_abs_lowcore(ctlreg, cregs_save_area[cr]); + abs_lc = get_abs_lowcore(&flags); + ctlreg = abs_lc->cregs_save_area[cr]; ctlreg = (ctlreg & parms.andval) | parms.orval; - put_abs_lowcore(cregs_save_area[cr], ctlreg); + abs_lc->cregs_save_area[cr] = ctlreg; + put_abs_lowcore(abs_lc, flags); spin_unlock(&ctl_lock); on_each_cpu(smp_ctl_bit_callback, &parms, 1); } @@ -650,35 +665,36 @@ int smp_store_status(int cpu) * This case does not exist for s390 anymore, setup_arch explicitly * deactivates the elfcorehdr= kernel parameter */ -static __init void smp_save_cpu_vxrs(struct save_area *sa, u16 addr, - bool is_boot_cpu, __vector128 *vxrs) +static bool dump_available(void) { - if (is_boot_cpu) - vxrs = boot_cpu_vector_save_area; - else - __pcpu_sigp_relax(addr, SIGP_STORE_ADDITIONAL_STATUS, __pa(vxrs)); - save_area_add_vxrs(sa, vxrs); + return oldmem_data.start || is_ipl_type_dump(); } -static __init void smp_save_cpu_regs(struct save_area *sa, u16 addr, - bool is_boot_cpu, void *regs) +void __init smp_save_dump_ipl_cpu(void) { - if (is_boot_cpu) - copy_oldmem_kernel(regs, __LC_FPREGS_SAVE_AREA, 512); - else - __pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, __pa(regs)); + struct save_area *sa; + void *regs; + + if (!dump_available()) + return; + sa = save_area_alloc(true); + regs = memblock_alloc(512, 8); + if (!sa || !regs) + panic("could not allocate memory for boot CPU save area\n"); + copy_oldmem_kernel(regs, __LC_FPREGS_SAVE_AREA, 512); save_area_add_regs(sa, regs); + memblock_free(regs, 512); + if (MACHINE_HAS_VX) + save_area_add_vxrs(sa, boot_cpu_vector_save_area); } -void __init smp_save_dump_cpus(void) +void __init smp_save_dump_secondary_cpus(void) { int addr, boot_cpu_addr, max_cpu_addr; struct save_area *sa; - bool is_boot_cpu; void *page; - if (!(oldmem_data.start || is_ipl_type_dump())) - /* No previous system present, normal boot. */ + if (!dump_available()) return; /* Allocate a page as dumping area for the store status sigps */ page = memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); @@ -691,26 +707,20 @@ void __init smp_save_dump_cpus(void) boot_cpu_addr = stap(); max_cpu_addr = SCLP_MAX_CORES << sclp.mtid_prev; for (addr = 0; addr <= max_cpu_addr; addr++) { + if (addr == boot_cpu_addr) + continue; if (__pcpu_sigp_relax(addr, SIGP_SENSE, 0) == SIGP_CC_NOT_OPERATIONAL) continue; - is_boot_cpu = (addr == boot_cpu_addr); - /* Allocate save area */ - sa = save_area_alloc(is_boot_cpu); + sa = save_area_alloc(false); if (!sa) panic("could not allocate memory for save area\n"); - if (MACHINE_HAS_VX) - /* Get the vector registers */ - smp_save_cpu_vxrs(sa, addr, is_boot_cpu, page); - /* - * For a zfcp/nvme dump OLDMEM_BASE == NULL and the registers - * of the boot CPU are stored in the HSA. To retrieve - * these registers an SCLP request is required which is - * done by drivers/s390/char/zcore.c:init_cpu_info() - */ - if (!is_boot_cpu || oldmem_data.start) - /* Get the CPU registers */ - smp_save_cpu_regs(sa, addr, is_boot_cpu, page); + __pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, __pa(page)); + save_area_add_regs(sa, page); + if (MACHINE_HAS_VX) { + __pcpu_sigp_relax(addr, SIGP_STORE_ADDITIONAL_STATUS, __pa(page)); + save_area_add_vxrs(sa, page); + } } memblock_free(page, PAGE_SIZE); diag_amode31_ops.diag308_reset(); @@ -1256,7 +1266,7 @@ static __always_inline void set_new_lowcore(struct lowcore *lc) : "memory", "cc"); } -static int __init smp_reinit_ipl_cpu(void) +int __init smp_reinit_ipl_cpu(void) { unsigned long async_stack, nodat_stack, mcck_stack; struct lowcore *lc, *lc_ipl; @@ -1281,6 +1291,8 @@ static int __init smp_reinit_ipl_cpu(void) __ctl_clear_bit(0, 28); /* disable lowcore protection */ S390_lowcore.mcesad = mcesad; __ctl_load(cr0, 0, 0); + if (abs_lowcore_map(0, lc, false)) + panic("Couldn't remap absolute lowcore"); lowcore_ptr[0] = lc; local_mcck_enable(); local_irq_restore(flags); @@ -1291,4 +1303,3 @@ static int __init smp_reinit_ipl_cpu(void) return 0; } -early_initcall(smp_reinit_ipl_cpu); diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index b7ef0b71014d..45d4b8182b07 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -4343,8 +4343,6 @@ retry: goto retry; } - /* nothing to do, just clear the request */ - kvm_clear_request(KVM_REQ_UNHALT, vcpu); /* we left the vsie handler, nothing to do, just clear the request */ kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index f7f5adea8940..be14c58cb989 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -13,13 +13,10 @@ void __delay(unsigned long loops) { - /* - * To end the bloody studid and useless discussion about the - * BogoMips number I took the liberty to define the __delay - * function in a way that that resulting BogoMips number will - * yield the megahertz number of the cpu. The important function - * is udelay and that is done using the tod clock. -- martin. - */ + /* + * Loop 'loops' times. Callers must not assume a specific + * amount of time passes before this function returns. + */ asm volatile("0: brct %0,0b" : : "d" ((loops/2) + 1)); } EXPORT_SYMBOL(__delay); diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c index 9f9af5298dd6..9953819d7959 100644 --- a/arch/s390/mm/dump_pagetables.c +++ b/arch/s390/mm/dump_pagetables.c @@ -8,8 +8,10 @@ #include <linux/kasan.h> #include <asm/ptdump.h> #include <asm/kasan.h> +#include <asm/abs_lowcore.h> #include <asm/nospec-branch.h> #include <asm/sections.h> +#include <asm/maccess.h> static unsigned long max_addr; @@ -21,6 +23,8 @@ struct addr_marker { enum address_markers_idx { IDENTITY_BEFORE_NR = 0, IDENTITY_BEFORE_END_NR, + AMODE31_START_NR, + AMODE31_END_NR, KERNEL_START_NR, KERNEL_END_NR, #ifdef CONFIG_KFENCE @@ -39,11 +43,17 @@ enum address_markers_idx { VMALLOC_END_NR, MODULES_NR, MODULES_END_NR, + ABS_LOWCORE_NR, + ABS_LOWCORE_END_NR, + MEMCPY_REAL_NR, + MEMCPY_REAL_END_NR, }; static struct addr_marker address_markers[] = { [IDENTITY_BEFORE_NR] = {0, "Identity Mapping Start"}, [IDENTITY_BEFORE_END_NR] = {(unsigned long)_stext, "Identity Mapping End"}, + [AMODE31_START_NR] = {0, "Amode31 Area Start"}, + [AMODE31_END_NR] = {0, "Amode31 Area End"}, [KERNEL_START_NR] = {(unsigned long)_stext, "Kernel Image Start"}, [KERNEL_END_NR] = {(unsigned long)_end, "Kernel Image End"}, #ifdef CONFIG_KFENCE @@ -62,6 +72,10 @@ static struct addr_marker address_markers[] = { [VMALLOC_END_NR] = {0, "vmalloc Area End"}, [MODULES_NR] = {0, "Modules Area Start"}, [MODULES_END_NR] = {0, "Modules Area End"}, + [ABS_LOWCORE_NR] = {0, "Lowcore Area Start"}, + [ABS_LOWCORE_END_NR] = {0, "Lowcore Area End"}, + [MEMCPY_REAL_NR] = {0, "Real Memory Copy Area Start"}, + [MEMCPY_REAL_END_NR] = {0, "Real Memory Copy Area End"}, { -1, NULL } }; @@ -276,8 +290,14 @@ static int pt_dump_init(void) max_addr = (S390_lowcore.kernel_asce & _REGION_ENTRY_TYPE_MASK) >> 2; max_addr = 1UL << (max_addr * 11 + 31); address_markers[IDENTITY_AFTER_END_NR].start_address = ident_map_size; + address_markers[AMODE31_START_NR].start_address = __samode31; + address_markers[AMODE31_END_NR].start_address = __eamode31; address_markers[MODULES_NR].start_address = MODULES_VADDR; address_markers[MODULES_END_NR].start_address = MODULES_END; + address_markers[ABS_LOWCORE_NR].start_address = __abs_lowcore; + address_markers[ABS_LOWCORE_END_NR].start_address = __abs_lowcore + ABS_LOWCORE_MAP_SIZE; + address_markers[MEMCPY_REAL_NR].start_address = __memcpy_real_area; + address_markers[MEMCPY_REAL_END_NR].start_address = __memcpy_real_area + PAGE_SIZE; address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap; address_markers[VMEMMAP_END_NR].start_address = (unsigned long)vmemmap + vmemmap_size; address_markers[VMALLOC_NR].start_address = VMALLOC_START; diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 9ab6ca6f7f59..9649d9382e0a 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -268,8 +268,7 @@ static noinline void do_sigbus(struct pt_regs *regs) (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK)); } -static noinline void do_fault_error(struct pt_regs *regs, int access, - vm_fault_t fault) +static noinline void do_fault_error(struct pt_regs *regs, vm_fault_t fault) { int si_code; @@ -516,7 +515,7 @@ void do_protection_exception(struct pt_regs *regs) fault = do_exception(regs, access); } if (unlikely(fault)) - do_fault_error(regs, access, fault); + do_fault_error(regs, fault); } NOKPROBE_SYMBOL(do_protection_exception); @@ -528,7 +527,7 @@ void do_dat_exception(struct pt_regs *regs) access = VM_ACCESS_FLAGS; fault = do_exception(regs, access); if (unlikely(fault)) - do_fault_error(regs, access, fault); + do_fault_error(regs, fault); } NOKPROBE_SYMBOL(do_dat_exception); @@ -803,7 +802,7 @@ void do_secure_storage_access(struct pt_regs *regs) addr = __gmap_translate(gmap, addr); mmap_read_unlock(mm); if (IS_ERR_VALUE(addr)) { - do_fault_error(regs, VM_ACCESS_FLAGS, VM_FAULT_BADMAP); + do_fault_error(regs, VM_FAULT_BADMAP); break; } fallthrough; @@ -813,7 +812,7 @@ void do_secure_storage_access(struct pt_regs *regs) vma = find_vma(mm, addr); if (!vma) { mmap_read_unlock(mm); - do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP); + do_fault_error(regs, VM_FAULT_BADMAP); break; } page = follow_page(vma, addr, FOLL_WRITE | FOLL_GET); @@ -836,7 +835,7 @@ void do_secure_storage_access(struct pt_regs *regs) BUG(); break; default: - do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP); + do_fault_error(regs, VM_FAULT_BADMAP); WARN_ON_ONCE(1); } } @@ -848,7 +847,7 @@ void do_non_secure_storage_access(struct pt_regs *regs) struct gmap *gmap = (struct gmap *)S390_lowcore.gmap; if (get_fault_type(regs) != GMAP_FAULT) { - do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP); + do_fault_error(regs, VM_FAULT_BADMAP); WARN_ON_ONCE(1); return; } diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 4a154a084966..97d66a3e60fb 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -37,7 +37,7 @@ #include <asm/kfence.h> #include <asm/ptdump.h> #include <asm/dma.h> -#include <asm/lowcore.h> +#include <asm/abs_lowcore.h> #include <asm/tlb.h> #include <asm/tlbflush.h> #include <asm/sections.h> diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c index d6d84e02f35a..1571cdcb0c50 100644 --- a/arch/s390/mm/maccess.c +++ b/arch/s390/mm/maccess.c @@ -12,10 +12,17 @@ #include <linux/errno.h> #include <linux/gfp.h> #include <linux/cpu.h> +#include <linux/uio.h> #include <asm/asm-extable.h> #include <asm/ctl_reg.h> #include <asm/io.h> +#include <asm/abs_lowcore.h> #include <asm/stacktrace.h> +#include <asm/maccess.h> + +unsigned long __bootdata_preserved(__memcpy_real_area); +static __ro_after_init pte_t *memcpy_real_ptep; +static DEFINE_MUTEX(memcpy_real_mutex); static notrace long s390_kernel_write_odd(void *dst, const void *src, size_t size) { @@ -76,118 +83,72 @@ notrace void *s390_kernel_write(void *dst, const void *src, size_t size) return dst; } -static int __no_sanitize_address __memcpy_real(void *dest, void *src, size_t count) +void __init memcpy_real_init(void) { - union register_pair _dst, _src; - int rc = -EFAULT; - - _dst.even = (unsigned long) dest; - _dst.odd = (unsigned long) count; - _src.even = (unsigned long) src; - _src.odd = (unsigned long) count; - asm volatile ( - "0: mvcle %[dst],%[src],0\n" - "1: jo 0b\n" - " lhi %[rc],0\n" - "2:\n" - EX_TABLE(1b,2b) - : [rc] "+&d" (rc), [dst] "+&d" (_dst.pair), [src] "+&d" (_src.pair) - : : "cc", "memory"); - return rc; -} - -static unsigned long __no_sanitize_address _memcpy_real(unsigned long dest, - unsigned long src, - unsigned long count) -{ - int irqs_disabled, rc; - unsigned long flags; - - if (!count) - return 0; - flags = arch_local_irq_save(); - irqs_disabled = arch_irqs_disabled_flags(flags); - if (!irqs_disabled) - trace_hardirqs_off(); - __arch_local_irq_stnsm(0xf8); // disable DAT - rc = __memcpy_real((void *) dest, (void *) src, (size_t) count); - if (flags & PSW_MASK_DAT) - __arch_local_irq_stosm(0x04); // enable DAT - if (!irqs_disabled) - trace_hardirqs_on(); - __arch_local_irq_ssm(flags); - return rc; + memcpy_real_ptep = vmem_get_alloc_pte(__memcpy_real_area, true); + if (!memcpy_real_ptep) + panic("Couldn't setup memcpy real area"); } -/* - * Copy memory in real mode (kernel to kernel) - */ -int memcpy_real(void *dest, unsigned long src, size_t count) +size_t memcpy_real_iter(struct iov_iter *iter, unsigned long src, size_t count) { - unsigned long _dest = (unsigned long)dest; - unsigned long _src = (unsigned long)src; - unsigned long _count = (unsigned long)count; - int rc; - - if (S390_lowcore.nodat_stack != 0) { - preempt_disable(); - rc = call_on_stack(3, S390_lowcore.nodat_stack, - unsigned long, _memcpy_real, - unsigned long, _dest, - unsigned long, _src, - unsigned long, _count); - preempt_enable(); - return rc; + size_t len, copied, res = 0; + unsigned long phys, offset; + void *chunk; + pte_t pte; + + while (count) { + phys = src & PAGE_MASK; + offset = src & ~PAGE_MASK; + chunk = (void *)(__memcpy_real_area + offset); + len = min(count, PAGE_SIZE - offset); + pte = mk_pte_phys(phys, PAGE_KERNEL_RO); + + mutex_lock(&memcpy_real_mutex); + if (pte_val(pte) != pte_val(*memcpy_real_ptep)) { + __ptep_ipte(__memcpy_real_area, memcpy_real_ptep, 0, 0, IPTE_GLOBAL); + set_pte(memcpy_real_ptep, pte); + } + copied = copy_to_iter(chunk, len, iter); + mutex_unlock(&memcpy_real_mutex); + + count -= copied; + src += copied; + res += copied; + if (copied < len) + break; } - /* - * This is a really early memcpy_real call, the stacks are - * not set up yet. Just call _memcpy_real on the early boot - * stack - */ - return _memcpy_real(_dest, _src, _count); + return res; } -/* - * Copy memory in absolute mode (kernel to kernel) - */ -void memcpy_absolute(void *dest, void *src, size_t count) +int memcpy_real(void *dest, unsigned long src, size_t count) { - unsigned long cr0, flags, prefix; - - flags = arch_local_irq_save(); - __ctl_store(cr0, 0, 0); - __ctl_clear_bit(0, 28); /* disable lowcore protection */ - prefix = store_prefix(); - if (prefix) { - local_mcck_disable(); - set_prefix(0); - memcpy(dest, src, count); - set_prefix(prefix); - local_mcck_enable(); - } else { - memcpy(dest, src, count); - } - __ctl_load(cr0, 0, 0); - arch_local_irq_restore(flags); + struct iov_iter iter; + struct kvec kvec; + + kvec.iov_base = dest; + kvec.iov_len = count; + iov_iter_kvec(&iter, WRITE, &kvec, 1, count); + if (memcpy_real_iter(&iter, src, count) < count) + return -EFAULT; + return 0; } /* - * Check if physical address is within prefix or zero page + * Find CPU that owns swapped prefix page */ -static int is_swapped(phys_addr_t addr) +static int get_swapped_owner(phys_addr_t addr) { phys_addr_t lc; int cpu; - if (addr < sizeof(struct lowcore)) - return 1; for_each_online_cpu(cpu) { lc = virt_to_phys(lowcore_ptr[cpu]); if (addr > lc + sizeof(struct lowcore) - 1 || addr < lc) continue; - return 1; + return cpu; } - return 0; + return -1; } /* @@ -200,17 +161,35 @@ void *xlate_dev_mem_ptr(phys_addr_t addr) { void *ptr = phys_to_virt(addr); void *bounce = ptr; + struct lowcore *abs_lc; + unsigned long flags; unsigned long size; + int this_cpu, cpu; cpus_read_lock(); - preempt_disable(); - if (is_swapped(addr)) { - size = PAGE_SIZE - (addr & ~PAGE_MASK); - bounce = (void *) __get_free_page(GFP_ATOMIC); - if (bounce) - memcpy_absolute(bounce, ptr, size); + this_cpu = get_cpu(); + if (addr >= sizeof(struct lowcore)) { + cpu = get_swapped_owner(addr); + if (cpu < 0) + goto out; + } + bounce = (void *)__get_free_page(GFP_ATOMIC); + if (!bounce) + goto out; + size = PAGE_SIZE - (addr & ~PAGE_MASK); + if (addr < sizeof(struct lowcore)) { + abs_lc = get_abs_lowcore(&flags); + ptr = (void *)abs_lc + addr; + memcpy(bounce, ptr, size); + put_abs_lowcore(abs_lc, flags); + } else if (cpu == this_cpu) { + ptr = (void *)(addr - virt_to_phys(lowcore_ptr[cpu])); + memcpy(bounce, ptr, size); + } else { + memcpy(bounce, ptr, size); } - preempt_enable(); +out: + put_cpu(); cpus_read_unlock(); return bounce; } diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index c2583f921ca8..ee1a97078527 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -240,7 +240,7 @@ static int __ref modify_pmd_table(pud_t *pud, unsigned long addr, } else if (pmd_none(*pmd)) { if (IS_ALIGNED(addr, PMD_SIZE) && IS_ALIGNED(next, PMD_SIZE) && - MACHINE_HAS_EDAT1 && addr && direct && + MACHINE_HAS_EDAT1 && direct && !debug_pagealloc_enabled()) { set_pmd(pmd, __pmd(__pa(addr) | prot)); pages++; @@ -336,7 +336,7 @@ static int modify_pud_table(p4d_t *p4d, unsigned long addr, unsigned long end, } else if (pud_none(*pud)) { if (IS_ALIGNED(addr, PUD_SIZE) && IS_ALIGNED(next, PUD_SIZE) && - MACHINE_HAS_EDAT2 && addr && direct && + MACHINE_HAS_EDAT2 && direct && !debug_pagealloc_enabled()) { set_pud(pud, __pud(__pa(addr) | prot)); pages++; @@ -561,6 +561,103 @@ int vmem_add_mapping(unsigned long start, unsigned long size) } /* + * Allocate new or return existing page-table entry, but do not map it + * to any physical address. If missing, allocate segment- and region- + * table entries along. Meeting a large segment- or region-table entry + * while traversing is an error, since the function is expected to be + * called against virtual regions reserverd for 4KB mappings only. + */ +pte_t *vmem_get_alloc_pte(unsigned long addr, bool alloc) +{ + pte_t *ptep = NULL; + pgd_t *pgd; + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_offset_k(addr); + if (pgd_none(*pgd)) { + if (!alloc) + goto out; + p4d = vmem_crst_alloc(_REGION2_ENTRY_EMPTY); + if (!p4d) + goto out; + pgd_populate(&init_mm, pgd, p4d); + } + p4d = p4d_offset(pgd, addr); + if (p4d_none(*p4d)) { + if (!alloc) + goto out; + pud = vmem_crst_alloc(_REGION3_ENTRY_EMPTY); + if (!pud) + goto out; + p4d_populate(&init_mm, p4d, pud); + } + pud = pud_offset(p4d, addr); + if (pud_none(*pud)) { + if (!alloc) + goto out; + pmd = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY); + if (!pmd) + goto out; + pud_populate(&init_mm, pud, pmd); + } else if (WARN_ON_ONCE(pud_large(*pud))) { + goto out; + } + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) { + if (!alloc) + goto out; + pte = vmem_pte_alloc(); + if (!pte) + goto out; + pmd_populate(&init_mm, pmd, pte); + } else if (WARN_ON_ONCE(pmd_large(*pmd))) { + goto out; + } + ptep = pte_offset_kernel(pmd, addr); +out: + return ptep; +} + +int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc) +{ + pte_t *ptep, pte; + + if (!IS_ALIGNED(addr, PAGE_SIZE)) + return -EINVAL; + ptep = vmem_get_alloc_pte(addr, alloc); + if (!ptep) + return -ENOMEM; + __ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL); + pte = mk_pte_phys(phys, prot); + set_pte(ptep, pte); + return 0; +} + +int vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot) +{ + int rc; + + mutex_lock(&vmem_mutex); + rc = __vmem_map_4k_page(addr, phys, prot, true); + mutex_unlock(&vmem_mutex); + return rc; +} + +void vmem_unmap_4k_page(unsigned long addr) +{ + pte_t *ptep; + + mutex_lock(&vmem_mutex); + ptep = virt_to_kpte(addr); + __ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL); + pte_clear(&init_mm, addr, ptep); + mutex_unlock(&vmem_mutex); +} + +/* * map whole physical memory to virtual memory (identity mapping) * we reserve enough space in the vmalloc area for vmemmap to hotplug * additional memory segments. @@ -584,6 +681,9 @@ void __init vmem_map_init(void) __set_memory(__stext_amode31, (__etext_amode31 - __stext_amode31) >> PAGE_SHIFT, SET_MEMORY_RO | SET_MEMORY_X); + /* lowcore requires 4k mapping for real addresses / prefixing */ + set_memory_4k(0, LC_PAGES); + /* lowcore must be executable for LPSWE */ if (!static_key_enabled(&cpu_has_bear)) set_memory_x(0, 1); diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index f46833a25526..227cf0a62800 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -666,7 +666,7 @@ static int __init dma_alloc_cpu_table_caches(void) int __init zpci_dma_init(void) { - s390_iommu_aperture = (u64)high_memory; + s390_iommu_aperture = (u64)virt_to_phys(high_memory); if (!s390_iommu_aperture_factor) s390_iommu_aperture = ULONG_MAX; else |