ia64: Remove perfmon

perfmon has been marked broken and thus been disabled for all builds
for more than two years.  Remove it entirely.

Cc: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Enthusiastically-ACKed-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20200911094920.1173631-1-hch@lst.de

arch/ia64/Kconfig

@@ -362,15 +362,6 @@ config ARCH_PROC_KCORE_TEXT
 config IA64_MCA_RECOVERY
 	tristate "MCA recovery from errors other than TLB."
 
-config PERFMON
-	bool "Performance monitor support"
-	depends on BROKEN
-	help
-	  Selects whether support for the IA-64 performance monitor hardware
-	  is included in the kernel.  This makes some kernel data-structures a
-	  little bigger and slows down execution a bit, but it is generally
-	  a good idea to turn this on.  If you're unsure, say Y.
-
 config IA64_PALINFO
 	tristate "/proc/pal support"
 	help

arch/ia64/configs/bigsur_defconfig

@@ -11,7 +11,6 @@ CONFIG_SMP=y
 CONFIG_NR_CPUS=2
 CONFIG_PREEMPT=y
 # CONFIG_VIRTUAL_MEM_MAP is not set
-CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
 CONFIG_EFI_VARS=y
 CONFIG_BINFMT_MISC=m

arch/ia64/configs/generic_defconfig

@@ -18,7 +18,6 @@ CONFIG_IA64_CYCLONE=y
 CONFIG_SMP=y
 CONFIG_HOTPLUG_CPU=y
 CONFIG_IA64_MCA_RECOVERY=y
-CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
 CONFIG_KEXEC=y
 CONFIG_CRASH_DUMP=y

arch/ia64/configs/gensparse_defconfig

@@ -17,7 +17,6 @@ CONFIG_NR_CPUS=512
 CONFIG_HOTPLUG_CPU=y
 CONFIG_SPARSEMEM_MANUAL=y
 CONFIG_IA64_MCA_RECOVERY=y
-CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
 CONFIG_EFI_VARS=y
 CONFIG_BINFMT_MISC=m

arch/ia64/configs/tiger_defconfig

@@ -21,7 +21,6 @@ CONFIG_HOTPLUG_CPU=y
 CONFIG_PERMIT_BSP_REMOVE=y
 CONFIG_FORCE_CPEI_RETARGET=y
 CONFIG_IA64_MCA_RECOVERY=y
-CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
 CONFIG_KEXEC=y
 CONFIG_EFI_VARS=y

arch/ia64/configs/zx1_defconfig

@@ -10,7 +10,6 @@ CONFIG_NR_CPUS=16
 CONFIG_HOTPLUG_CPU=y
 CONFIG_FLATMEM_MANUAL=y
 CONFIG_IA64_MCA_RECOVERY=y
-CONFIG_PERFMON=y
 CONFIG_IA64_PALINFO=y
 CONFIG_CRASH_DUMP=y
 CONFIG_EFI_VARS=y

arch/ia64/include/asm/processor.h

@@ -280,15 +280,6 @@ struct thread_struct {
 	__u64 map_base;			/* base address for get_unmapped_area() */
 	__u64 rbs_bot;			/* the base address for the RBS */
 	int last_fph_cpu;		/* CPU that may hold the contents of f32-f127 */
-
-#ifdef CONFIG_PERFMON
-	void *pfm_context;		     /* pointer to detailed PMU context */
-	unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
-# define INIT_THREAD_PM		.pfm_context =		NULL,     \
-				.pfm_needs_checking =	0UL,
-#else
-# define INIT_THREAD_PM
-#endif
 	unsigned long dbr[IA64_NUM_DBG_REGS];
 	unsigned long ibr[IA64_NUM_DBG_REGS];
 	struct ia64_fpreg fph[96];	/* saved/loaded on demand */
@@ -301,7 +292,6 @@ struct thread_struct {
 	.map_base =	DEFAULT_MAP_BASE,			\
 	.rbs_bot =	STACK_TOP - DEFAULT_USER_STACK_SIZE,	\
 	.last_fph_cpu =  -1,					\
-	INIT_THREAD_PM						\
 	.dbr =		{0, },					\
 	.ibr =		{0, },					\
 	.fph =		{{{{0}}}, }				\

arch/ia64/include/asm/switch_to.h

@@ -31,16 +31,8 @@ extern struct task_struct *ia64_switch_to (void *next_task);
 extern void ia64_save_extra (struct task_struct *task);
 extern void ia64_load_extra (struct task_struct *task);
 
-#ifdef CONFIG_PERFMON
-  DECLARE_PER_CPU(unsigned long, pfm_syst_info);
-# define PERFMON_IS_SYSWIDE() (__this_cpu_read(pfm_syst_info) & 0x1)
-#else
-# define PERFMON_IS_SYSWIDE() (0)
-#endif
-
 #define IA64_HAS_EXTRA_STATE(t)							\
-	((t)->thread.flags & (IA64_THREAD_DBG_VALID|IA64_THREAD_PM_VALID)	\
-	 || PERFMON_IS_SYSWIDE())
+	((t)->thread.flags & (IA64_THREAD_DBG_VALID|IA64_THREAD_PM_VALID))
 
 #define __switch_to(prev,next,last) do {							 \
 	if (IA64_HAS_EXTRA_STATE(prev))								 \

arch/ia64/kernel/Makefile

@@ -10,7 +10,7 @@ endif
 extra-y	:= head.o vmlinux.lds
 
 obj-y := entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o	\
-	 irq_lsapic.o ivt.o pal.o patch.o process.o perfmon.o ptrace.o sal.o		\
+	 irq_lsapic.o ivt.o pal.o patch.o process.o ptrace.o sal.o		\
 	 salinfo.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o \
 	 unwind.o mca.o mca_asm.o topology.o dma-mapping.o iosapic.o acpi.o \
 	 acpi-ext.o
@@ -21,7 +21,6 @@ obj-$(CONFIG_IA64_PALINFO)	+= palinfo.o
 obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_SMP)		+= smp.o smpboot.o
 obj-$(CONFIG_NUMA)		+= numa.o
-obj-$(CONFIG_PERFMON)		+= perfmon_default_smpl.o
 obj-$(CONFIG_IA64_CYCLONE)	+= cyclone.o
 obj-$(CONFIG_IA64_MCA_RECOVERY)	+= mca_recovery.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o

arch/ia64/kernel/irq_ia64.c

@@ -40,10 +40,6 @@
 #include <asm/hw_irq.h>
 #include <asm/tlbflush.h>
 
-#ifdef CONFIG_PERFMON
-# include <asm/perfmon.h>
-#endif
-
 #define IRQ_DEBUG	0
 
 #define IRQ_VECTOR_UNASSIGNED	(0)
@@ -627,9 +623,6 @@ init_IRQ (void)
 				    "irq_move");
 	}
 #endif
-#ifdef CONFIG_PERFMON
-	pfm_init_percpu();
-#endif
 }
 
 void

arch/ia64/kernel/process.c

@@ -51,10 +51,6 @@
 
 #include "entry.h"
 
-#ifdef CONFIG_PERFMON
-# include <asm/perfmon.h>
-#endif
-
 #include "sigframe.h"
 
 void (*ia64_mark_idle)(int);
@@ -174,15 +170,6 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
 		return;
 	}
 
-#ifdef CONFIG_PERFMON
-	if (current->thread.pfm_needs_checking)
-		/*
-		 * Note: pfm_handle_work() allow us to call it with interrupts
-		 * disabled, and may enable interrupts within the function.
-		 */
-		pfm_handle_work();
-#endif
-
 	/* deal with pending signal delivery */
 	if (test_thread_flag(TIF_SIGPENDING)) {
 		local_irq_enable();	/* force interrupt enable */
@@ -264,41 +251,15 @@ void arch_cpu_idle(void)
 void
 ia64_save_extra (struct task_struct *task)
 {
-#ifdef CONFIG_PERFMON
-	unsigned long info;
-#endif
-
 	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
 		ia64_save_debug_regs(&task->thread.dbr[0]);
-
-#ifdef CONFIG_PERFMON
-	if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
-		pfm_save_regs(task);
-
-	info = __this_cpu_read(pfm_syst_info);
-	if (info & PFM_CPUINFO_SYST_WIDE)
-		pfm_syst_wide_update_task(task, info, 0);
-#endif
 }
 
 void
 ia64_load_extra (struct task_struct *task)
 {
-#ifdef CONFIG_PERFMON
-	unsigned long info;
-#endif
-
 	if ((task->thread.flags & IA64_THREAD_DBG_VALID) != 0)
 		ia64_load_debug_regs(&task->thread.dbr[0]);
-
-#ifdef CONFIG_PERFMON
-	if ((task->thread.flags & IA64_THREAD_PM_VALID) != 0)
-		pfm_load_regs(task);
-
-	info = __this_cpu_read(pfm_syst_info);
-	if (info & PFM_CPUINFO_SYST_WIDE)
-		pfm_syst_wide_update_task(task, info, 1);
-#endif
 }
 
 /*
@@ -432,11 +393,6 @@ copy_thread(unsigned long clone_flags, unsigned long user_stack_base,
 	 */
 	child_ptregs->cr_ipsr = ((child_ptregs->cr_ipsr | IA64_PSR_BITS_TO_SET)
 				 & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_PP | IA64_PSR_UP));
-
-#ifdef CONFIG_PERFMON
-	if (current->thread.pfm_context)
-		pfm_inherit(p, child_ptregs);
-#endif
 	return retval;
 }
 
@@ -563,15 +519,6 @@ exit_thread (struct task_struct *tsk)
 {
 
 	ia64_drop_fpu(tsk);
-#ifdef CONFIG_PERFMON
-       /* if needed, stop monitoring and flush state to perfmon context */
-	if (tsk->thread.pfm_context)
-		pfm_exit_thread(tsk);
-
-	/* free debug register resources */
-	if (tsk->thread.flags & IA64_THREAD_DBG_VALID)
-		pfm_release_debug_registers(tsk);
-#endif
 }
 
 unsigned long

arch/ia64/kernel/ptrace.c

@@ -30,9 +30,6 @@
 #include <asm/rse.h>
 #include <linux/uaccess.h>
 #include <asm/unwind.h>
-#ifdef CONFIG_PERFMON
-#include <asm/perfmon.h>
-#endif
 
 #include "entry.h"
 
@@ -1951,27 +1948,6 @@ access_uarea(struct task_struct *child, unsigned long addr,
 				"address 0x%lx\n", addr);
 		return -1;
 	}
-#ifdef CONFIG_PERFMON
-	/*
-	 * Check if debug registers are used by perfmon. This
-	 * test must be done once we know that we can do the
-	 * operation, i.e. the arguments are all valid, but
-	 * before we start modifying the state.
-	 *
-	 * Perfmon needs to keep a count of how many processes
-	 * are trying to modify the debug registers for system
-	 * wide monitoring sessions.
-	 *
-	 * We also include read access here, because they may
-	 * cause the PMU-installed debug register state
-	 * (dbr[], ibr[]) to be reset. The two arrays are also
-	 * used by perfmon, but we do not use
-	 * IA64_THREAD_DBG_VALID. The registers are restored
-	 * by the PMU context switch code.
-	 */
-	if (pfm_use_debug_registers(child))
-		return -1;
-#endif
 
 	if (!(child->thread.flags & IA64_THREAD_DBG_VALID)) {
 		child->thread.flags |= IA64_THREAD_DBG_VALID;

arch/ia64/kernel/smpboot.c

@@ -355,10 +355,6 @@ smp_callin (void)
 	extern void ia64_init_itm(void);
 	extern volatile int time_keeper_id;
 
-#ifdef CONFIG_PERFMON
-	extern void pfm_init_percpu(void);
-#endif
-
 	cpuid = smp_processor_id();
 	phys_id = hard_smp_processor_id();
 	itc_master = time_keeper_id;
@@ -389,10 +385,6 @@ smp_callin (void)
 
 	ia64_mca_cmc_vector_setup();	/* Setup vector on AP */
 
-#ifdef CONFIG_PERFMON
-	pfm_init_percpu();
-#endif
-
 	local_irq_enable();
 
 	if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) {

arch/ia64/kernel/syscalls/syscall.tbl

@@ -160,7 +160,7 @@
 148	common	mmap2				sys_mmap2
 149	common	pciconfig_read			sys_pciconfig_read
 150	common	pciconfig_write			sys_pciconfig_write
-151	common	perfmonctl			sys_perfmonctl
+151	common	perfmonctl			sys_ni_syscall
 152	common	sigaltstack			sys_sigaltstack
 153	common	rt_sigaction			sys_rt_sigaction
 154	common	rt_sigpending			sys_rt_sigpending

arch/ia64/lib/Makefile

@@ -12,7 +12,6 @@ lib-y := io.o __divsi3.o __udivsi3.o __modsi3.o __umodsi3.o		\
 
 lib-$(CONFIG_ITANIUM)	+= copy_page.o copy_user.o memcpy.o
 lib-$(CONFIG_MCKINLEY)	+= copy_page_mck.o memcpy_mck.o
-lib-$(CONFIG_PERFMON)	+= carta_random.o
 
 AFLAGS___divdi3.o	=
 AFLAGS___udivdi3.o	= -DUNSIGNED

arch/ia64/lib/carta_random.S

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Fast, simple, yet decent quality random number generator based on
- * a paper by David G. Carta ("Two Fast Implementations of the
- * `Minimal Standard' Random Number Generator," Communications of the
- * ACM, January, 1990).
- *
- * Copyright (C) 2002 Hewlett-Packard Co
- *	David Mosberger-Tang <davidm@hpl.hp.com>
- */
-
-#include <asm/asmmacro.h>
-
-#define a	r2
-#define m	r3
-#define lo	r8
-#define hi	r9
-#define t0	r16
-#define t1	r17
-#define	seed	r32
-
-GLOBAL_ENTRY(carta_random32)
-	movl	a = (16807 << 16) | 16807
-	;;
-	pmpyshr2.u t0 = a, seed, 0
-	pmpyshr2.u t1 = a, seed, 16
-	;;
-	unpack2.l t0 = t1, t0
-	dep	m = -1, r0, 0, 31
-	;;
-	zxt4	lo = t0
-	shr.u	hi = t0, 32
-	;;
-	dep	t0 = 0, hi, 15, 49	// t0 = (hi & 0x7fff)
-	;;
-	shl	t0 = t0, 16		// t0 = (hi & 0x7fff) << 16
-	shr	t1 = hi, 15		// t1 = (hi >> 15)
-	;;
-	add	lo = lo, t0
-	;;
-	cmp.gtu	p6, p0 = lo, m
-	;;
-(p6)	and	lo = lo, m
-	;;
-(p6)	add	lo = 1, lo
-	;;
-	add	lo = lo, t1
-	;;
-	cmp.gtu p6, p0 = lo, m
-	;;
-(p6)	and	lo = lo, m
-	;;
-(p6)	add	lo = 1, lo
-	br.ret.sptk.many rp
-END(carta_random32)

arch/ia64/oprofile/Makefile

@@ -8,4 +8,3 @@ DRIVER_OBJS := $(addprefix ../../../drivers/oprofile/, \
 		timer_int.o )
 
 oprofile-y := $(DRIVER_OBJS) init.o backtrace.o
-oprofile-$(CONFIG_PERFMON) += perfmon.o

arch/ia64/oprofile/init.c

@@ -18,21 +18,11 @@ extern void ia64_backtrace(struct pt_regs * const regs, unsigned int depth);
 
 int __init oprofile_arch_init(struct oprofile_operations *ops)
 {
-	int ret = -ENODEV;
-
-#ifdef CONFIG_PERFMON
-	/* perfmon_init() can fail, but we have no way to report it */
-	ret = perfmon_init(ops);
-#endif
 	ops->backtrace = ia64_backtrace;
-
-	return ret;
+	return -ENODEV;
 }
 
 
 void oprofile_arch_exit(void)
 {
-#ifdef CONFIG_PERFMON
-	perfmon_exit();
-#endif
 }

arch/ia64/oprofile/perfmon.c

-/**
- * @file perfmon.c
- *
- * @remark Copyright 2003 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <levon@movementarian.org>
- */
-
-#include <linux/kernel.h>
-#include <linux/oprofile.h>
-#include <linux/sched.h>
-#include <asm/perfmon.h>
-#include <asm/ptrace.h>
-#include <asm/errno.h>
-
-static int allow_ints;
-
-static int
-perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
-                struct pt_regs *regs, unsigned long stamp)
-{
-	int event = arg->pmd_eventid;
- 
-	arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
-
-	/* the owner of the oprofile event buffer may have exited
-	 * without perfmon being shutdown (e.g. SIGSEGV)
-	 */
-	if (allow_ints)
-		oprofile_add_sample(regs, event);
-	return 0;
-}
-
-
-static int perfmon_start(void)
-{
-	allow_ints = 1;
-	return 0;
-}
-
-
-static void perfmon_stop(void)
-{
-	allow_ints = 0;
-}
-
-
-#define OPROFILE_FMT_UUID { \
-	0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c }
-
-static pfm_buffer_fmt_t oprofile_fmt = {
- 	.fmt_name 	    = "oprofile_format",
- 	.fmt_uuid	    = OPROFILE_FMT_UUID,
- 	.fmt_handler	    = perfmon_handler,
-};
-
-
-static char *get_cpu_type(void)
-{
-	__u8 family = local_cpu_data->family;
-
-	switch (family) {
-		case 0x07:
-			return "ia64/itanium";
-		case 0x1f:
-			return "ia64/itanium2";
-		default:
-			return "ia64/ia64";
-	}
-}
-
-
-/* all the ops are handled via userspace for IA64 perfmon */
-
-static int using_perfmon;
-
-int perfmon_init(struct oprofile_operations *ops)
-{
-	int ret = pfm_register_buffer_fmt(&oprofile_fmt);
-	if (ret)
-		return -ENODEV;
-
-	ops->cpu_type = get_cpu_type();
-	ops->start = perfmon_start;
-	ops->stop = perfmon_stop;
-	using_perfmon = 1;
-	printk(KERN_INFO "oprofile: using perfmon.\n");
-	return 0;
-}
-
-
-void perfmon_exit(void)
-{
-	if (!using_perfmon)
-		return;
-
-	pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid);
-}