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Fri, 24 Jan 2020 14:15:06 +0000 (GMT) From: Kamil Konieczny To: k.konieczny@samsung.com Cc: Bartlomiej Zolnierkiewicz , Chanwoo Choi , Krzysztof Kozlowski , Kukjin Kim , Kyungmin Park , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, Marek Szyprowski , MyungJoo Ham Subject: [PATCH RESEND 3/3] PM / devfreq: exynos-nocp: change load and total calculations Date: Fri, 24 Jan 2020 15:14:49 +0100 Message-Id: <20200124141449.19844-4-k.konieczny@samsung.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124141449.19844-1-k.konieczny@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrMKsWRmVeSWpSXmKPExsWy7djPc7qvf2vFGZzrMrXYOGM9q8X1L89Z LRZ8msFq0f/4NbPF+fMb2C3ONr1ht9j0+BqrxeVdc9gsPvceYbSYcX4fk8XaI3fZLW43rmBz 4PHYtKqTzWPzknqPvi2rGD0+b5ILYInisklJzcksSy3St0vgyrg+5TVLwS2lis5j/awNjMtl uhg5OSQETCTWflvP3MXIxSEksIJRYuKpJewQzhdGieuTGtkgnM+MErtv7GeEafm0ZjNUy3JG icVLTjPCtey5v5kdpIpNQF/i4NmTLCC2iIC0ROeiiUwgRcwCm5gl7r9+B5YQFoiWWL1tJ5jN IqAq8aNxITOIzStgI9F85y0TxDp5idmNp9lAbE4BW4lVZ1axQ9QISpyc+QSslxmopnnrbLCT JASWsUu8nHyTDaLZRWLp7UYWCFtY4tXxLewQtozE6ck9UPFyiacL+9ghmlsYJR60f4RKWEvc OfcLaBAH0AZNifW79CHCjhLHvrQwgoQlBPgkbrwVhLiBT2LStunMEGFeiY42IYhqVYnnp3qg XpGW6Pq/jhXC9pB4/OoX8wRGxVlIvpmF5JtZCHsXMDKvYhRPLS3OTU8tNspLLdcrTswtLs1L 10vOz93ECExKp/8d/7KDcdefpEOMAhyMSjy8M+5pxQmxJpYVV+YeYpTgYFYS4WUM04wT4k1J rKxKLcqPLyrNSS0+xCjNwaIkzmu86GWskEB6YklqdmpqQWoRTJaJg1OqgbHz1OOG3Wt49+3+ HfKxjvW/h5ZYzmvheYtvGa6vcjtV96cs7uLytd90Ou+k7Hood+Whn8exKa8/Sdg/ave3bDtp OqnhU5nfTtO9x/61W+UkpW0wW/RVJSBeZcqrpQXC6+eyy1h3aVz9JC2xgfVOsaiixpslK0xT r7/fuKNN4GP14derEqKWMhxUYinOSDTUYi4qTgQAVZdplEYDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprPIsWRmVeSWpSXmKPExsVy+t/xu7qvf2vFGdz6Lm2xccZ6VovrX56z Wiz4NIPVov/xa2aL8+c3sFucbXrDbrHp8TVWi8u75rBZfO49wmgx4/w+Jou1R+6yW9xuXMHm wOOxaVUnm8fmJfUefVtWMXp83iQXwBKlZ1OUX1qSqpCRX1xiqxRtaGGkZ2hpoWdkYqlnaGwe a2VkqqRvZ5OSmpNZllqkb5egl3F9ymuWgltKFZ3H+lkbGJfLdDFyckgImEh8WrOZGcQWEljK KNH5yQ4iLi3ReHo1E4QtLPHnWhcbRM0nRonvx0JBbDYBfYmDZ0+ygNgiQPWdiyYC1XNxMAvs YpZYMW022FBhgUiJd23vwGwWAVWJH40LwWxeARuJ5jtvoRbIS8xuPA22gFPAVmLVmVXsEMts JKZsXcUIUS8ocXLmE7BlzED1zVtnM09gFJiFJDULSWoBI9MqRpHU0uLc9NxiI73ixNzi0rx0 veT83E2MwMjZduznlh2MXe+CDzEKcDAq8fA63NGKE2JNLCuuzD3EKMHBrCTCyximGSfEm5JY WZValB9fVJqTWnyI0RToiYnMUqLJ+cCoziuJNzQ1NLewNDQ3Njc2s1AS5+0QOBgjJJCeWJKa nZpakFoE08fEwSnVwHjNZYZsh83sab3Xa5w+MSTYbTl6Z7pUXPqxTROYaoJdjyz5Oc/2S1qP w3vf/qrvC7evSV1WvWdJub7mqu9hEauubbl7N2JS0pldBWna16ZJyldpOJ49cLumUbpZkj9H OfbKmicBPbslLeSFJ7xk+W9U18Jjo9PgcfbbUpNv4QsOJjQcUf956LoSS3FGoqEWc1FxIgAB VReisgIAAA== X-CMS-MailID: 20200124141507eucas1p115e87fdd6eda4a5f320d5145f5960889 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200124141507eucas1p115e87fdd6eda4a5f320d5145f5960889 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200124141507eucas1p115e87fdd6eda4a5f320d5145f5960889 References: <20200124141449.19844-1-k.konieczny@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There are two problems with exynos-nocp driver. First one is reading bytes and cycle counters and comparing them one to one without taking into account wcore bus width. Second one is that cycle counter depends on DREX DRAM clock, not on wcore clock. The latter problem was exposed by commit 6e7674c3c6df5 ("memory: Add DMC driver for Exynos5422"), which changes DRAM clock depending on memory read/write pressure and when it gets at higher freqency, NoCP cycle counter also increases. Note that both of these problems was there before this commit. The proposed solution is to use byte counter from NoCP h/w registers for current wcore bandwidth calculations and derive max bandwidth from current frequency. While at it, change from bytes to kilobytes to avoid overflow in later calculations in exynos-bus and devfreq drivers. Also while at it, remove cycle counters setting and reading and extend dev_dbg with time interval in miliseconds, percent of load, raw counter value in hex. Signed-off-by: Kamil Konieczny --- drivers/devfreq/event/exynos-nocp.c | 61 ++++++++++++----------------- 1 file changed, 24 insertions(+), 37 deletions(-) diff --git a/drivers/devfreq/event/exynos-nocp.c b/drivers/devfreq/event/exynos-nocp.c index ebe9cdf94f54..979ec094cf26 100644 --- a/drivers/devfreq/event/exynos-nocp.c +++ b/drivers/devfreq/event/exynos-nocp.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -60,19 +61,6 @@ static int exynos_nocp_set_event(struct devfreq_event_dev *edev) if (ret < 0) goto out; - ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_SRC, - NOCP_CNT_SRC_INTEVENT_MASK, - NOCP_CNT_SRC_INTEVENT_CYCLE_MASK); - if (ret < 0) - goto out; - - ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_SRC, - NOCP_CNT_SRC_INTEVENT_MASK, - NOCP_CNT_SRC_INTEVENT_CHAIN_MASK); - if (ret < 0) - goto out; - - /* Set an alarm with a max/min value of 0 to generate StatALARM */ ret = regmap_write(nocp->regmap, NOCP_STAT_ALARM_MIN, 0x0); if (ret < 0) @@ -95,18 +83,6 @@ static int exynos_nocp_set_event(struct devfreq_event_dev *edev) if (ret < 0) goto out; - ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_2_ALARM_MODE, - NOCP_CNT_ALARM_MODE_MASK, - NOCP_CNT_ALARM_MODE_MIN_MAX_MASK); - if (ret < 0) - goto out; - - ret = regmap_update_bits(nocp->regmap, NOCP_COUNTERS_3_ALARM_MODE, - NOCP_CNT_ALARM_MODE_MASK, - NOCP_CNT_ALARM_MODE_MIN_MAX_MASK); - if (ret < 0) - goto out; - /* Enable the measurements by setting AlarmEn and StatEn */ ret = regmap_update_bits(nocp->regmap, NOCP_MAIN_CTL, NOCP_MAIN_CTL_STATEN_MASK | NOCP_MAIN_CTL_ALARMEN_MASK, @@ -145,6 +121,7 @@ static int exynos_nocp_get_event(struct devfreq_event_dev *edev, { struct exynos_nocp *nocp = devfreq_event_get_drvdata(edev); unsigned int counter[4]; + unsigned long dt; int ret; /* Read cycle count */ @@ -156,19 +133,29 @@ static int exynos_nocp_get_event(struct devfreq_event_dev *edev, if (ret < 0) goto out; - ret = regmap_read(nocp->regmap, NOCP_COUNTERS_2_VAL, &counter[2]); - if (ret < 0) - goto out; - - ret = regmap_read(nocp->regmap, NOCP_COUNTERS_3_VAL, &counter[3]); - if (ret < 0) - goto out; - edata->load_count = ((counter[1] << 16) | counter[0]); - edata->total_count = ((counter[3] << 16) | counter[2]); - - dev_dbg(&edev->dev, "%s (event: %lu/%lu)\n", edev->desc->name, - edata->load_count, edata->total_count); + dt = jiffies_to_msecs((long)jiffies - (long)edata->prev_time); + if (dt == 0) + dt = 1; + + /* + * count load in kB/s + * load = load / 1000 * 1000 / dt + */ + edata->load_count = edata->load_count / dt; + + /* + * count max bandwidth in kB/s: + * bw = freq * ((bus width in bits / 8) / nr of mem channels) / 1000 + * where 128 bits / 8 bits per byte / 4 channels = 4 + * so it is: bw = freq * 4 / 1000 + */ + edata->total_count = edata->curr_freq / 250; + + dev_dbg(&edev->dev, "%s (event: %lu/%lu) %lums %lu%% 0x%08x\n", + edev->desc->name, edata->load_count, edata->total_count, dt, + edata->load_count * 100 / edata->total_count, + (counter[1] << 16) | counter[0]); return 0; -- 2.25.0