diff options
Diffstat (limited to 'drivers/gator/driver/gator_events_armv7.c')
| -rw-r--r-- | drivers/gator/driver/gator_events_armv7.c | 320 |
1 files changed, 0 insertions, 320 deletions
diff --git a/drivers/gator/driver/gator_events_armv7.c b/drivers/gator/driver/gator_events_armv7.c deleted file mode 100644 index cdf450f1975..00000000000 --- a/drivers/gator/driver/gator_events_armv7.c +++ /dev/null @@ -1,320 +0,0 @@ -/** - * Copyright (C) ARM Limited 2010-2012. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -/* Disabling interrupts - * Many of the functions below disable interrupts via local_irq_save(). This disabling of interrupts is done to prevent any race conditions - * between multiple entities (e.g. hrtimer interrupts and event based interrupts) calling the same functions. As accessing the pmu involves - * several steps (disable, select, read, enable), these steps must be performed atomically. Normal synchronization routines cannot be used - * as these functions are being called from interrupt context. - */ - -#include "gator.h" - -// gator_events_perf_pmu.c is used if perf is supported -#if GATOR_NO_PERF_SUPPORT - -// Per-CPU PMNC: config reg -#define PMNC_E (1 << 0) /* Enable all counters */ -#define PMNC_P (1 << 1) /* Reset all counters */ -#define PMNC_C (1 << 2) /* Cycle counter reset */ -#define PMNC_MASK 0x3f /* Mask for writable bits */ - -// ccnt reg -#define CCNT_REG (1 << 31) - -#define CCNT 0 -#define CNT0 1 -#define CNTMAX (6+1) - -static const char *pmnc_name; -static int pmnc_counters; - -static unsigned long pmnc_enabled[CNTMAX]; -static unsigned long pmnc_event[CNTMAX]; -static unsigned long pmnc_key[CNTMAX]; - -static DEFINE_PER_CPU(int[CNTMAX], perfPrev); -static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt); - -inline void armv7_pmnc_write(u32 val) -{ - val &= PMNC_MASK; - asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r" (val)); -} - -inline u32 armv7_pmnc_read(void) -{ - u32 val; - asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val)); - return val; -} - -inline u32 armv7_ccnt_read(u32 reset_value) -{ - unsigned long flags; - u32 newval = -reset_value; - u32 den = CCNT_REG; - u32 val; - - local_irq_save(flags); - asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); // disable - asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val)); // read - asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (newval));// new value - asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); // enable - local_irq_restore(flags); - - return val; -} - -inline u32 armv7_cntn_read(unsigned int cnt, u32 reset_value) -{ - unsigned long flags; - u32 newval = -reset_value; - u32 sel = (cnt - CNT0); - u32 den = 1 << sel; - u32 oldval; - - local_irq_save(flags); - asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (den)); // disable - asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (sel)); // select - asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (oldval)); // read - asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (newval));// new value - asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (den)); // enable - local_irq_restore(flags); - - return oldval; -} - -static inline void armv7_pmnc_disable_interrupt(unsigned int cnt) -{ - u32 val = cnt ? (1 << (cnt - CNT0)) : (1 << 31); - asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val)); -} - -inline u32 armv7_pmnc_reset_interrupt(void) -{ - // Get and reset overflow status flags - u32 flags; - asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (flags)); - flags &= 0x8000003f; - asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (flags)); - return flags; -} - -static inline u32 armv7_pmnc_enable_counter(unsigned int cnt) -{ - u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG; - asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val)); - return cnt; -} - -static inline u32 armv7_pmnc_disable_counter(unsigned int cnt) -{ - u32 val = cnt ? (1 << (cnt - CNT0)) : CCNT_REG; - asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val)); - return cnt; -} - -static inline int armv7_pmnc_select_counter(unsigned int cnt) -{ - u32 val = (cnt - CNT0); - asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val)); - return cnt; -} - -static inline void armv7_pmnc_write_evtsel(unsigned int cnt, u32 val) -{ - if (armv7_pmnc_select_counter(cnt) == cnt) { - asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val)); - } -} - -static int gator_events_armv7_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *dir; - int i; - - for (i = 0; i < pmnc_counters; i++) { - char buf[40]; - if (i == 0) { - snprintf(buf, sizeof buf, "ARM_%s_ccnt", pmnc_name); - } else { - snprintf(buf, sizeof buf, "ARM_%s_cnt%d", pmnc_name, i-1); - } - dir = gatorfs_mkdir(sb, root, buf); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]); - gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]); - if (i > 0) { - gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]); - } - } - - return 0; -} - -static int gator_events_armv7_online(int** buffer) -{ - unsigned int cnt, len = 0, cpu = smp_processor_id(); - - if (armv7_pmnc_read() & PMNC_E) { - armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E); - } - - // Initialize & Reset PMNC: C bit and P bit - armv7_pmnc_write(PMNC_P | PMNC_C); - - // Reset overflow flags - armv7_pmnc_reset_interrupt(); - - for (cnt = CCNT; cnt < CNTMAX; cnt++) { - unsigned long event; - - per_cpu(perfPrev, cpu)[cnt] = 0; - - if (!pmnc_enabled[cnt]) - continue; - - // Disable counter - armv7_pmnc_disable_counter(cnt); - - event = pmnc_event[cnt] & 255; - - // Set event (if destined for PMNx counters), we don't need to set the event if it's a cycle count - if (cnt != CCNT) - armv7_pmnc_write_evtsel(cnt, event); - - armv7_pmnc_disable_interrupt(cnt); - - // Reset counter - cnt ? armv7_cntn_read(cnt, 0) : armv7_ccnt_read(0); - - // Enable counter - armv7_pmnc_enable_counter(cnt); - } - - // enable - armv7_pmnc_write(armv7_pmnc_read() | PMNC_E); - - // return zero values, no need to read as the counters were just reset - for (cnt = 0; cnt < pmnc_counters; cnt++) { - if (pmnc_enabled[cnt]) { - per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt]; - per_cpu(perfCnt, cpu)[len++] = 0; - } - } - - if (buffer) - *buffer = per_cpu(perfCnt, cpu); - - return len; -} - -static int gator_events_armv7_offline(int** buffer) -{ - // disbale all counters, including PMCCNTR; overflow IRQs will not be signaled - armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E); - - return 0; -} - -static void gator_events_armv7_stop(void) -{ - unsigned int cnt; - - for (cnt = CCNT; cnt < CNTMAX; cnt++) { - pmnc_enabled[cnt] = 0; - pmnc_event[cnt] = 0; - } -} - -static int gator_events_armv7_read(int **buffer) -{ - int cnt, len = 0; - int cpu = smp_processor_id(); - - for (cnt = 0; cnt < pmnc_counters; cnt++) { - if (pmnc_enabled[cnt]) { - int value; - if (cnt == CCNT) { - value = armv7_ccnt_read(0); - } else { - value = armv7_cntn_read(cnt, 0); - } - if (value != per_cpu(perfPrev, cpu)[cnt]) { - per_cpu(perfPrev, cpu)[cnt] = value; - per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt]; - per_cpu(perfCnt, cpu)[len++] = value; - } - } - } - - if (buffer) - *buffer = per_cpu(perfCnt, cpu); - - return len; -} - -static struct gator_interface gator_events_armv7_interface = { - .create_files = gator_events_armv7_create_files, - .stop = gator_events_armv7_stop, - .online = gator_events_armv7_online, - .offline = gator_events_armv7_offline, - .read = gator_events_armv7_read, -}; - -int gator_events_armv7_init(void) -{ - unsigned int cnt; - - switch (gator_cpuid()) { - case CORTEX_A5: - pmnc_name = "Cortex-A5"; - pmnc_counters = 2; - break; - case CORTEX_A7: - pmnc_name = "Cortex-A7"; - pmnc_counters = 4; - break; - case CORTEX_A8: - pmnc_name = "Cortex-A8"; - pmnc_counters = 4; - break; - case CORTEX_A9: - pmnc_name = "Cortex-A9"; - pmnc_counters = 6; - break; - case CORTEX_A15: - pmnc_name = "Cortex-A15"; - pmnc_counters = 6; - break; - default: - return -1; - } - - pmnc_counters++; // CNT[n] + CCNT - - for (cnt = CCNT; cnt < CNTMAX; cnt++) { - pmnc_enabled[cnt] = 0; - pmnc_event[cnt] = 0; - pmnc_key[cnt] = gator_events_get_key(); - } - - return gator_events_install(&gator_events_armv7_interface); -} - -gator_events_init(gator_events_armv7_init); - -#else -int gator_events_armv7_init(void) -{ - return -1; -} -#endif |