perf/x86/intel/uncore: Clean up client IMC

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

Clean 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 the server code later.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@kernel.org
Cc: eranian@google.com
Link: https://lkml.kernel.org/r/1556672028-119221-6-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 442f30e5e49a86cba8b5871d5dd25e430c8e0e18..8bb537143d86491323e7826505574fe60af76ef3 100644 (file)
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -120,6 +120,21 @@ 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 fc5f48816005ede5b817af283c747986abff2950..cdd9691365a112e94a2b1d9172bbeb32c31335fc 100644 (file)
--- 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 b0ca4f88c6f21b8d6118767db5810ede6dfee096..dbaa1b088a30e6106b680a666540016180c694ad 100644 (file)
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -428,11 +428,6 @@ 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)
 {}
 
@@ -445,13 +440,6 @@ 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.
@@ -578,13 +566,13 @@ 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 = {