diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/oprofile/profile.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/oprofile/profile.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/oprofile/profile.c b/target/linux/ubicom32/files/arch/ubicom32/oprofile/profile.c deleted file mode 100644 index aeac3c6667..0000000000 --- a/target/linux/ubicom32/files/arch/ubicom32/oprofile/profile.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - * arch/ubicom32/oprofile/profile.c - * Oprofile support for arch Ubicom32 - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port is free software: you can redistribute - * it and/or modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, either version 2 of the - * License, or (at your option) - * any later version. - * - * The Ubicom32 Linux Kernel Port is distributed in the hope that it will - * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with the Ubicom32 Linux Kernel Port. If not, see - * <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ - -/** - * @file profile.c - * - * @remark Copyright 2002 OProfile authors - * @remark Read the file COPYING - * - * @author Hunyue Yau <hy@hy-research.com> - */ - -#include <linux/oprofile.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/kernel.h> - -#include <asm/devtree.h> -#include <asm/thread.h> - -/* For identifying userland vs kernel address */ -#include <asm/stacktrace.h> -#include "ipProf.h" - -/* For communications with the backend */ -static struct profilenode *profile_node; - -/* Bitmask containing all Linux threads - as seen by the ROSR reg */ -static unsigned long th_all_mask; - -/* Lookup table to translate a hardware thread into a CPU identifier - * Table is indexed by the ROSR value which is assumed to be - * relatively small (0...15). - */ -unsigned int cpu_map[THREAD_ARCHITECTURAL_MAX]; - -static struct pt_regs regs; - -/* - * For each sample returned, checked to see if they are relevant to - * us. This is necessary as the ubicom32 architecture has other software - * running outside of Linux. Only then, put the sample into the relevant - * cpu bins. - * - * To minimize overhead, a global mask with all possible threads of in - * interest to us is used as a first check. Then a second mask identifying - * the thread is used to obtain an identifier for that "CPU". - */ - -/* - * ubicom32_build_cpu_th_mask() - * - * Build a lookup table for translation between hardware thread - * "ROSR" values and Linux CPU ids - * - * *** This gets executed on all CPUs at once! *** - */ -static void ubicom32_build_cpu_th_mask(void *mask) -{ - thread_t self = thread_get_self(); - unsigned long *th_m = mask; - - BUG_ON(self <= 0 || self >= THREAD_ARCHITECTURAL_MAX); - cpu_map[self] = smp_processor_id(); - - set_bit(self, th_m); -} - -/* - * profile_interrupt() - * - * Process samples returned from the profiler backend. The backend - * may return samples that are irrelevant to us or may even return - * multiple samples for the same CPU. Note that the sames may be - * for ANY cpu. At this time, this is unique and to support this requires - * Oprofile to expose an interface to accept the CPU that the same came - * frome. - */ -static irqreturn_t profile_interrupt(int irq, void *arg) -{ - int i, buf_entry; - int is_kernel; - unsigned int bit_th; - unsigned int th; - - if (!(profile_node->enabled) || profile_node->count < 0) { - printk(KERN_WARNING - "Unexpected interrupt, no samples or not enabled!\n"); - return IRQ_HANDLED; - } - - profile_node->busy = 1; /* Keep backend out */ - - for (i = 0; i < profile_node->count; i++) { - buf_entry = profile_node->tail; - profile_node->tail++; - profile_node->tail %= IPPROFILETIO_MAX_SAMPLES; - - /* Note - the "thread" ID is only the lower 4 bits */ - th = (0x0f & profile_node->samples[buf_entry].thread); - bit_th = (1 << th); - - if ((bit_th & th_all_mask) == 0) - continue; - - regs.pc = profile_node->samples[buf_entry].pc; - - is_kernel = ubicom32_is_kernel(regs.pc); - - oprofile_add_ext_sample_cpu(regs.pc, ®s, 0, is_kernel, - cpu_map[th]); - } - profile_node->count = 0; - profile_node->busy = 0; - - return IRQ_HANDLED; -} - -/* - * profile_start() - * - * Notification from oprofile to start the profiler - */ -static int profile_start(void) -{ - if (!profile_node) - return -1; - - profile_node->enabled = 1; - - return 0; -} - -/* - * profile_stop() - * - * Notification from oprofile to stop the profiler - */ -static void profile_stop(void) -{ - if (profile_node) - profile_node->enabled = 0; -} - -/* - * oprofile_arch_init() - * - * Attach to Oprofile after qualify the availability of the backend - * profiler support. - */ -int __init oprofile_arch_init(struct oprofile_operations *ops) -{ - int r = -ENODEV; - - profile_node = (struct profilenode *)devtree_find_node("profiler"); - - if (profile_node == NULL) { - printk(KERN_WARNING "Cannot find profiler node\n"); - return r; - } - - r = request_irq(profile_node->dn.recvirq, profile_interrupt, - IRQF_DISABLED, "profiler", NULL); - - if (r < 0) { - profile_node = NULL; - printk(KERN_WARNING "Cannot get profiler IRQ\n"); - return r; - } - - ops->start = profile_start; - ops->stop = profile_stop; - ops->cpu_type = "timer"; - - memset(cpu_map, 0, sizeof(cpu_map)); - - on_each_cpu(ubicom32_build_cpu_th_mask, &th_all_mask, 1); - - memset(®s, 0, sizeof(regs)); - - return r; -} - -/* - * oprofile_arch_exit() - * - * External call to take outselves out. - * Make sure backend is not running. - */ -void oprofile_arch_exit(void) -{ - BUG_ON(profile_node->enabled); -} |