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authorSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>2017-02-24 11:48:18 +0300
committerIngo Molnar <mingo@kernel.org>2017-03-30 10:53:54 +0300
commitf5863a00e73c432b91e4efe1d68778b4ace6a892 (patch)
tree07d20407d1caaf4ec5a2ee0e3d85b0d77707623e /arch/x86/events/amd
parent6b9376e30f42b902260371245f009bc05eb3fdfb (diff)
downloadlinux-f5863a00e73c432b91e4efe1d68778b4ace6a892.tar.xz
x86/events/amd/iommu.c: Modify functions to query max banks and counters
Currently, amd_iommu_pc_get_max_[banks|counters]() use end-point device ID to locate an IOMMU and check the reported max banks/counters. The logic assumes that the IOMMU_BASE_DEVID belongs to the first IOMMU, and uses it to acquire a reference to the first IOMMU, which does not work on certain systems. Instead, modify the function to take an IOMMU index, and use it to query the corresponding AMD IOMMU instance. Currently, hardcode the IOMMU index to 0 since the current AMD IOMMU perf implementation supports only a single IOMMU. A subsequent patch will add support for multiple IOMMUs, and will use a proper IOMMU index. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Jörg Rödel <joro@8bytes.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: iommu@lists.linux-foundation.org Link: http://lkml.kernel.org/r/1487926102-13073-7-git-send-email-Suravee.Suthikulpanit@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/events/amd')
-rw-r--r--arch/x86/events/amd/iommu.c17
-rw-r--r--arch/x86/events/amd/iommu.h9
2 files changed, 11 insertions, 15 deletions
diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
index d4375dadd4e9..10f67d39cac5 100644
--- a/arch/x86/events/amd/iommu.c
+++ b/arch/x86/events/amd/iommu.c
@@ -239,14 +239,6 @@ static int perf_iommu_event_init(struct perf_event *event)
return -EINVAL;
}
- /* integrate with iommu base devid (0000), assume one iommu */
- perf_iommu->max_banks =
- amd_iommu_pc_get_max_banks(IOMMU_BASE_DEVID);
- perf_iommu->max_counters =
- amd_iommu_pc_get_max_counters(IOMMU_BASE_DEVID);
- if ((perf_iommu->max_banks == 0) || (perf_iommu->max_counters == 0))
- return -EINVAL;
-
/* update the hw_perf_event struct with the iommu config data */
hwc->config = config;
hwc->extra_reg.config = config1;
@@ -448,6 +440,11 @@ static __init int _init_perf_amd_iommu(
return ret;
}
+ perf_iommu->max_banks = amd_iommu_pc_get_max_banks(0);
+ perf_iommu->max_counters = amd_iommu_pc_get_max_counters(0);
+ if (!perf_iommu->max_banks || !perf_iommu->max_counters)
+ return -EINVAL;
+
perf_iommu->null_group = NULL;
perf_iommu->pmu.attr_groups = perf_iommu->attr_groups;
@@ -457,8 +454,8 @@ static __init int _init_perf_amd_iommu(
amd_iommu_pc_exit();
} else {
pr_info("Detected AMD IOMMU (%d banks, %d counters/bank).\n",
- amd_iommu_pc_get_max_banks(IOMMU_BASE_DEVID),
- amd_iommu_pc_get_max_counters(IOMMU_BASE_DEVID));
+ amd_iommu_pc_get_max_banks(0),
+ amd_iommu_pc_get_max_counters(0));
}
return ret;
diff --git a/arch/x86/events/amd/iommu.h b/arch/x86/events/amd/iommu.h
index 5c5c9329e571..b775107c221e 100644
--- a/arch/x86/events/amd/iommu.h
+++ b/arch/x86/events/amd/iommu.h
@@ -24,19 +24,18 @@
#define PC_MAX_SPEC_BNKS 64
#define PC_MAX_SPEC_CNTRS 16
-/* iommu pc reg masks*/
-#define IOMMU_BASE_DEVID 0x0000
-
/* amd_iommu_init.c external support functions */
extern int amd_iommu_get_num_iommus(void);
extern bool amd_iommu_pc_supported(void);
-extern u8 amd_iommu_pc_get_max_banks(u16 devid);
+extern u8 amd_iommu_pc_get_max_banks(unsigned int idx);
-extern u8 amd_iommu_pc_get_max_counters(u16 devid);
+extern u8 amd_iommu_pc_get_max_counters(unsigned int idx);
extern int amd_iommu_pc_get_set_reg_val(u16 devid, u8 bank, u8 cntr,
u8 fxn, u64 *value, bool is_write);
+extern struct amd_iommu *get_amd_iommu(int idx);
+
#endif /*_PERF_EVENT_AMD_IOMMU_H_*/