7be6296fdd
Implement a perf PMU to handle IOMMU performance counters and events. The PMU only supports counting mode (e.g. perf stat). Since the counters are shared across all cores, the PMU is implemented as "system-wide" mode. To invoke the AMD IOMMU PMU, issue a perf tool command such as: ./perf stat -a -e amd_iommu/<events>/ <command> or: ./perf stat -a -e amd_iommu/config=<config-data>,config1=<config1-data>/ <command> For example: ./perf stat -a -e amd_iommu/mem_trans_total/ <command> The resulting count will be how many IOMMU total peripheral memory operations were performed during the command execution window. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1370466709-3212-3-git-send-email-suravee.suthikulpanit@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/*
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* Copyright (C) 2013 Advanced Micro Devices, Inc.
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*
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* Author: Steven Kinney <Steven.Kinney@amd.com>
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* Author: Suravee Suthikulpanit <Suraveee.Suthikulpanit@amd.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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _PERF_EVENT_AMD_IOMMU_H_
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#define _PERF_EVENT_AMD_IOMMU_H_
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/* iommu pc mmio region register indexes */
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#define IOMMU_PC_COUNTER_REG 0x00
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#define IOMMU_PC_COUNTER_SRC_REG 0x08
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#define IOMMU_PC_PASID_MATCH_REG 0x10
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#define IOMMU_PC_DOMID_MATCH_REG 0x18
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#define IOMMU_PC_DEVID_MATCH_REG 0x20
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#define IOMMU_PC_COUNTER_REPORT_REG 0x28
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/* maximun specified bank/counters */
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#define PC_MAX_SPEC_BNKS 64
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#define PC_MAX_SPEC_CNTRS 16
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/* iommu pc reg masks*/
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#define IOMMU_BASE_DEVID 0x0000
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/* amd_iommu_init.c external support functions */
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extern bool amd_iommu_pc_supported(void);
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extern u8 amd_iommu_pc_get_max_banks(u16 devid);
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extern u8 amd_iommu_pc_get_max_counters(u16 devid);
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extern int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr,
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u8 fxn, u64 *value, bool is_write);
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#endif /*_PERF_EVENT_AMD_IOMMU_H_*/
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