lkml.org 
[lkml]   [2019]   [Apr]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4/5] perf/x86/intel/uncore: Clean up client IMC
Date
From: Kan Liang <kan.liang@linux.intel.com>

The client IMC block is accessed by MMIO. Current code uses an informal
way to access the block, which is not recommended.

Cleaning up the code by using __iomem annotation and the accessor
functions (read[lq]()).
Move exit_box() and read_counter() to generic code, which can be shared
with server later.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
arch/x86/events/intel/uncore.c | 15 +++++++++++++++
arch/x86/events/intel/uncore.h | 6 +++++-
arch/x86/events/intel/uncore_snb.c | 16 ++--------------
3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 3c00635..39b0f96 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -119,6 +119,21 @@ u64 uncore_msr_read_counter(struct intel_uncore_box *box, struct perf_event *eve
return count;
}

+void uncore_mmio_exit_box(struct intel_uncore_box *box)
+{
+ if (box->io_addr)
+ iounmap(box->io_addr);
+}
+
+u64 uncore_mmio_read_counter(struct intel_uncore_box *box,
+ struct perf_event *event)
+{
+ if (!box->io_addr)
+ return 0;
+
+ return readq(box->io_addr + event->hw.event_base);
+}
+
/*
* generic get constraint function for shared match/mask registers.
*/
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index 426a490..738bed3 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -2,6 +2,7 @@
#include <linux/slab.h>
#include <linux/pci.h>
#include <asm/apicdef.h>
+#include <linux/io-64-nonatomic-lo-hi.h>

#include <linux/perf_event.h>
#include "../perf_event.h"
@@ -128,7 +129,7 @@ struct intel_uncore_box {
struct hrtimer hrtimer;
struct list_head list;
struct list_head active_list;
- void *io_addr;
+ void __iomem *io_addr;
struct intel_uncore_extra_reg shared_regs[0];
};

@@ -502,6 +503,9 @@ static inline struct intel_uncore_box *uncore_event_to_box(struct perf_event *ev

struct intel_uncore_box *uncore_pmu_to_box(struct intel_uncore_pmu *pmu, int cpu);
u64 uncore_msr_read_counter(struct intel_uncore_box *box, struct perf_event *event);
+void uncore_mmio_exit_box(struct intel_uncore_box *box);
+u64 uncore_mmio_read_counter(struct intel_uncore_box *box,
+ struct perf_event *event);
void uncore_pmu_start_hrtimer(struct intel_uncore_box *box);
void uncore_pmu_cancel_hrtimer(struct intel_uncore_box *box);
void uncore_pmu_event_start(struct perf_event *event, int flags);
diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index f843181..5d0ce4347 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -420,11 +420,6 @@ static void snb_uncore_imc_init_box(struct intel_uncore_box *box)
box->hrtimer_duration = UNCORE_SNB_IMC_HRTIMER_INTERVAL;
}

-static void snb_uncore_imc_exit_box(struct intel_uncore_box *box)
-{
- iounmap(box->io_addr);
-}
-
static void snb_uncore_imc_enable_box(struct intel_uncore_box *box)
{}

@@ -437,13 +432,6 @@ static void snb_uncore_imc_enable_event(struct intel_uncore_box *box, struct per
static void snb_uncore_imc_disable_event(struct intel_uncore_box *box, struct perf_event *event)
{}

-static u64 snb_uncore_imc_read_counter(struct intel_uncore_box *box, struct perf_event *event)
-{
- struct hw_perf_event *hwc = &event->hw;
-
- return (u64)*(unsigned int *)(box->io_addr + hwc->event_base);
-}
-
/*
* Keep the custom event_init() function compatible with old event
* encoding for free running counters.
@@ -570,13 +558,13 @@ static struct pmu snb_uncore_imc_pmu = {

static struct intel_uncore_ops snb_uncore_imc_ops = {
.init_box = snb_uncore_imc_init_box,
- .exit_box = snb_uncore_imc_exit_box,
+ .exit_box = uncore_mmio_exit_box,
.enable_box = snb_uncore_imc_enable_box,
.disable_box = snb_uncore_imc_disable_box,
.disable_event = snb_uncore_imc_disable_event,
.enable_event = snb_uncore_imc_enable_event,
.hw_config = snb_uncore_imc_hw_config,
- .read_counter = snb_uncore_imc_read_counter,
+ .read_counter = uncore_mmio_read_counter,
};

static struct intel_uncore_type snb_uncore_imc = {
--
2.7.4
\
 
 \ /
  Last update: 2019-04-15 20:44    [W:0.038 / U:11.844 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site