18f2190d79
Add PPU event-based and cycle-based profiling support to Oprofile for Cell. Oprofile is expected to collect data on all CPUs simultaneously. However, there is one set of performance counters per node. There are two hardware threads or virtual CPUs on each node. Hence, OProfile must multiplex in time the performance counter collection on the two virtual CPUs. The multiplexing of the performance counters is done by a virtual counter routine. Initially, the counters are configured to collect data on the even CPUs in the system, one CPU per node. In order to capture the PC for the virtual CPU when the performance counter interrupt occurs (the specified number of events between samples has occurred), the even processors are configured to handle the performance counter interrupts for their node. The virtual counter routine is called via a kernel timer after the virtual sample time. The routine stops the counters, saves the current counts, loads the last counts for the other virtual CPU on the node, sets interrupts to be handled by the other virtual CPU and restarts the counters, the virtual timer routine is scheduled to run again. The virtual sample time is kept relatively small to make sure sampling occurs on both CPUs on the node with a relatively small granularity. Whenever the counters overflow, the performance counter interrupt is called to collect the PC for the CPU where data is being collected. The oprofile driver relies on a firmware RTAS call to setup the debug bus to route the desired signals to the performance counter hardware to be counted. The RTAS call must set the routing registers appropriately in each of the islands to pass the signals down the debug bus as well as routing the signals from a particular island onto the bus. There is a second firmware RTAS call to reset the debug bus to the non pass thru state when the counters are not in use. Signed-off-by: Carl Love <carll@us.ibm.com> Signed-off-by: Maynard Johnson <mpjohn@us.ibm.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
113 lines
4.1 KiB
C
113 lines
4.1 KiB
C
/*
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* Cell Broadband Engine Performance Monitor
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*
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* (C) Copyright IBM Corporation 2006
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*
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* Author:
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* David Erb (djerb@us.ibm.com)
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* Kevin Corry (kevcorry@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ASM_CELL_PMU_H__
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#define __ASM_CELL_PMU_H__
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/* The Cell PMU has four hardware performance counters, which can be
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* configured as four 32-bit counters or eight 16-bit counters.
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*/
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#define NR_PHYS_CTRS 4
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#define NR_CTRS (NR_PHYS_CTRS * 2)
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/* Macros for the pm_control register. */
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#define CBE_PM_16BIT_CTR(ctr) (1 << (24 - ((ctr) & (NR_PHYS_CTRS - 1))))
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#define CBE_PM_ENABLE_PERF_MON 0x80000000
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#define CBE_PM_STOP_AT_MAX 0x40000000
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#define CBE_PM_TRACE_MODE_GET(pm_control) (((pm_control) >> 28) & 0x3)
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#define CBE_PM_TRACE_MODE_SET(mode) (((mode) & 0x3) << 28)
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#define CBE_PM_COUNT_MODE_SET(count) (((count) & 0x3) << 18)
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#define CBE_PM_FREEZE_ALL_CTRS 0x00100000
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#define CBE_PM_ENABLE_EXT_TRACE 0x00008000
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/* Macros for the trace_address register. */
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#define CBE_PM_TRACE_BUF_FULL 0x00000800
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#define CBE_PM_TRACE_BUF_EMPTY 0x00000400
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#define CBE_PM_TRACE_BUF_DATA_COUNT(ta) ((ta) & 0x3ff)
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#define CBE_PM_TRACE_BUF_MAX_COUNT 0x400
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/* Macros for the pm07_control registers. */
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#define CBE_PM_CTR_INPUT_MUX(pm07_control) (((pm07_control) >> 26) & 0x3f)
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#define CBE_PM_CTR_INPUT_CONTROL 0x02000000
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#define CBE_PM_CTR_POLARITY 0x01000000
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#define CBE_PM_CTR_COUNT_CYCLES 0x00800000
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#define CBE_PM_CTR_ENABLE 0x00400000
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/* Macros for the pm_status register. */
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#define CBE_PM_CTR_OVERFLOW_INTR(ctr) (1 << (31 - ((ctr) & 7)))
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enum pm_reg_name {
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group_control,
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debug_bus_control,
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trace_address,
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ext_tr_timer,
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pm_status,
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pm_control,
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pm_interval,
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pm_start_stop,
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};
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/* Routines for reading/writing the PMU registers. */
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extern u32 cbe_read_phys_ctr(u32 cpu, u32 phys_ctr);
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extern void cbe_write_phys_ctr(u32 cpu, u32 phys_ctr, u32 val);
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extern u32 cbe_read_ctr(u32 cpu, u32 ctr);
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extern void cbe_write_ctr(u32 cpu, u32 ctr, u32 val);
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extern u32 cbe_read_pm07_control(u32 cpu, u32 ctr);
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extern void cbe_write_pm07_control(u32 cpu, u32 ctr, u32 val);
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extern u32 cbe_read_pm(u32 cpu, enum pm_reg_name reg);
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extern void cbe_write_pm(u32 cpu, enum pm_reg_name reg, u32 val);
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extern u32 cbe_get_ctr_size(u32 cpu, u32 phys_ctr);
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extern void cbe_set_ctr_size(u32 cpu, u32 phys_ctr, u32 ctr_size);
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extern void cbe_enable_pm(u32 cpu);
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extern void cbe_disable_pm(u32 cpu);
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extern void cbe_read_trace_buffer(u32 cpu, u64 *buf);
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extern void cbe_enable_pm_interrupts(u32 cpu, u32 thread, u32 mask);
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extern void cbe_disable_pm_interrupts(u32 cpu);
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extern u32 cbe_query_pm_interrupts(u32 cpu);
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extern u32 cbe_clear_pm_interrupts(u32 cpu);
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extern void cbe_sync_irq(int node);
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/* Utility functions, macros */
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extern u32 cbe_get_hw_thread_id(int cpu);
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#define cbe_cpu_to_node(cpu) ((cpu) >> 1)
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#define CBE_COUNT_SUPERVISOR_MODE 0
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#define CBE_COUNT_HYPERVISOR_MODE 1
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#define CBE_COUNT_PROBLEM_MODE 2
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#define CBE_COUNT_ALL_MODES 3
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/* Macros for the pm07_control registers. */
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#define PM07_CTR_INPUT_MUX(x) (((x) & 0x3F) << 26)
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#define PM07_CTR_INPUT_CONTROL(x) (((x) & 1) << 25)
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#define PM07_CTR_POLARITY(x) (((x) & 1) << 24)
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#define PM07_CTR_COUNT_CYCLES(x) (((x) & 1) << 23)
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#define PM07_CTR_ENABLE(x) (((x) & 1) << 22)
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#endif /* __ASM_CELL_PMU_H__ */
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