LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: nico@linaro.org, b.zolnierkie@samsung.com, kgene@kernel.org,
	a.kesavan@samsung.com, arnd@arndb.de, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, Liviu.Dudau@arm.com,
	Lorenzo.Pieralisi@arm.com, Pawel.Moll@arm.com, olof@lixom.net,
	Sudeep.Holla@arm.com, Punit.Agrawal@arm.com, Will.Deacon@arm.com,
	Catalin.Marinas@arm.com,
	"Suzuki K. Poulose" <suzuki.poulose@arm.com>
Subject: [PATCH 5/5] arm-cci: Fix CCI PMU event validation
Date: Mon,  2 Mar 2015 11:29:14 +0000	[thread overview]
Message-ID: <1425295754-13376-6-git-send-email-suzuki.poulose@arm.com> (raw)
In-Reply-To: <1425295754-13376-1-git-send-email-suzuki.poulose@arm.com>

From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>

We mask the event with the CCI_PMU_EVENT_MASK, before passing
the config to pmu_validate_hw_event(), which causes extra bits
to be ignored and qualifies an invalid event code as valid.

e.g,
 $ perf stat -a -C 0 -e CCI_400/config=0x1ff,name=cycles/ sleep 1
   Performance counter stats for 'system wide':

         506951142      cycles

       1.013879626 seconds time elapsed

where, cycles has an event coding of 0xff. This patch also removes
the unnecessary 'event' mask in pmu_write_register, since the config_base
is set by the pmu code after the event is validated.

Helps in killing CCI_PMU_EVENT_MASK from common code.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
---
 drivers/bus/arm-cci.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index f86f096..438a121 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -191,11 +191,14 @@ static int pmu_is_valid_master_event(u8 ev_code)
 		ev_code <= pmu->model->event_ranges[CCI_IF_MASTER].max;
 }
 
-static int pmu_validate_hw_event(u8 hw_event)
+static int pmu_validate_hw_event(u32 hw_event)
 {
 	u8 ev_source = CCI_PMU_EVENT_SOURCE(hw_event);
 	u8 ev_code = CCI_PMU_EVENT_CODE(hw_event);
 
+	if (hw_event & ~CCI_PMU_EVENT_MASK)
+		return -ENOENT;
+
 	switch (ev_source) {
 	case CCI_PORT_S0:
 	case CCI_PORT_S1:
@@ -265,7 +268,6 @@ static void pmu_enable_counter(int idx)
 
 static void pmu_set_event(int idx, unsigned long event)
 {
-	event &= CCI_PMU_EVENT_MASK;
 	pmu_write_register(event, idx, CCI_PMU_EVT_SEL);
 }
 
@@ -282,7 +284,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev
 {
 	struct cci_pmu *cci_pmu = to_cci_pmu(event->pmu);
 	struct hw_perf_event *hw_event = &event->hw;
-	unsigned long cci_event = hw_event->config_base & CCI_PMU_EVENT_MASK;
+	unsigned long cci_event = hw_event->config_base;
 	int idx;
 
 	if (cci_event == CCI_PMU_CYCLES) {
@@ -303,7 +305,7 @@ static int pmu_get_event_idx(struct cci_pmu_hw_events *hw, struct perf_event *ev
 static int pmu_map_event(struct perf_event *event)
 {
 	int mapping;
-	u8 config = event->attr.config & CCI_PMU_EVENT_MASK;
+	u32 config = event->attr.config;
 
 	if (event->attr.type < PERF_TYPE_MAX)
 		return -ENOENT;
-- 
1.7.9.5



  parent reply	other threads:[~2015-03-02 11:29 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-02 11:29 [PATCH v2 0/5] arm-cci400: PMU monitoring support on ARM64 Suzuki K. Poulose
2015-03-02 11:29 ` [PATCH 1/5] arm-cci: Rearrange code for splitting PMU vs driver code Suzuki K. Poulose
2015-03-03 15:35   ` Sudeep Holla
2015-03-04 12:16     ` Suzuki K. Poulose
2015-03-02 11:29 ` [PATCH 2/5] arm-cci: Abstract the CCI400 PMU speicific definitions Suzuki K. Poulose
2015-03-02 11:29 ` [PATCH 3/5] arm-cci: Get rid of secure transactions for PMU driver Suzuki K. Poulose
2015-03-03 15:44   ` Sudeep Holla
2015-03-04 17:52     ` Suzuki K. Poulose
2015-03-02 11:29 ` [PATCH 4/5] arm-cci: Split the code for PMU vs driver support Suzuki K. Poulose
2015-03-03 15:53   ` Sudeep Holla
2015-03-04 12:18     ` Suzuki K. Poulose
2015-03-02 11:29 ` Suzuki K. Poulose [this message]
2015-03-03 16:00 ` [PATCH v2 0/5] arm-cci400: PMU monitoring support on ARM64 Sudeep Holla
2015-03-04 12:17   ` Suzuki K. Poulose
2015-03-10 15:18 [PATCHv3 " Suzuki K. Poulose
2015-03-10 15:18 ` [PATCH 5/5] arm-cci: Fix CCI PMU event validation Suzuki K. Poulose
2015-03-17 18:52   ` Will Deacon
2015-03-18 12:24 [PATCHv4 0/5] arm-cci400: PMU monitoring support on ARM64 Suzuki K. Poulose
2015-03-18 12:24 ` [PATCH 5/5] arm-cci: Fix CCI PMU event validation Suzuki K. Poulose

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1425295754-13376-6-git-send-email-suzuki.poulose@arm.com \
    --to=suzuki.poulose@arm.com \
    --cc=Catalin.Marinas@arm.com \
    --cc=Liviu.Dudau@arm.com \
    --cc=Lorenzo.Pieralisi@arm.com \
    --cc=Pawel.Moll@arm.com \
    --cc=Punit.Agrawal@arm.com \
    --cc=Sudeep.Holla@arm.com \
    --cc=Will.Deacon@arm.com \
    --cc=a.kesavan@samsung.com \
    --cc=arnd@arndb.de \
    --cc=b.zolnierkie@samsung.com \
    --cc=devicetree@vger.kernel.org \
    --cc=kgene@kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=nico@linaro.org \
    --cc=olof@lixom.net \
    --subject='Re: [PATCH 5/5] arm-cci: Fix CCI PMU event validation' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).