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Date: Mon, 16 May 2022 20:52:18 +0800
From: Yicong Yang <yangyicong@...ilicon.com>
To: <gregkh@...uxfoundation.org>, <alexander.shishkin@...ux.intel.com>,
<leo.yan@...aro.org>, <james.clark@....com>, <will@...nel.org>,
<robin.murphy@....com>, <acme@...nel.org>,
<jonathan.cameron@...wei.com>, <john.garry@...wei.com>
CC: <helgaas@...nel.org>, <lorenzo.pieralisi@....com>,
<mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
<mark.rutland@....com>, <joro@...tes.org>,
<shameerali.kolothum.thodi@...wei.com>, <peterz@...radead.org>,
<mingo@...hat.com>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-pci@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
<iommu@...ts.linux-foundation.org>, <prime.zeng@...wei.com>,
<liuqi115@...wei.com>, <zhangshaokun@...ilicon.com>,
<linuxarm@...wei.com>, <yangyicong@...ilicon.com>
Subject: [PATCH v8 3/8] hwtracing: hisi_ptt: Add tune function support for HiSilicon PCIe Tune and Trace device
Add tune function for the HiSilicon Tune and Trace device. The interface
of tune is exposed through sysfs attributes of PTT PMU device.
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
drivers/hwtracing/ptt/hisi_ptt.c | 157 +++++++++++++++++++++++++++++++
drivers/hwtracing/ptt/hisi_ptt.h | 23 +++++
2 files changed, 180 insertions(+)
diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index ef25ce98f664..c3fdb9bfb1b4 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -25,6 +25,161 @@
/* Dynamic CPU hotplug state used by PTT */
static enum cpuhp_state hisi_ptt_pmu_online;
+static bool hisi_ptt_wait_tuning_finish(struct hisi_ptt *hisi_ptt)
+{
+ u32 val;
+
+ return !readl_poll_timeout(hisi_ptt->iobase + HISI_PTT_TUNING_INT_STAT,
+ val, !(val & HISI_PTT_TUNING_INT_STAT_MASK),
+ HISI_PTT_WAIT_POLL_INTERVAL_US,
+ HISI_PTT_WAIT_TUNE_TIMEOUT_US);
+}
+
+static int hisi_ptt_tune_data_get(struct hisi_ptt *hisi_ptt,
+ u32 event, u16 *data)
+{
+ u32 reg;
+
+ reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
+ reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
+ reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
+ event);
+ writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
+
+ /* Write all 1 to indicates it's the read process */
+ writel(~0U, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
+
+ if (!hisi_ptt_wait_tuning_finish(hisi_ptt))
+ return -ETIMEDOUT;
+
+ reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
+ reg &= HISI_PTT_TUNING_DATA_VAL_MASK;
+ *data = FIELD_GET(HISI_PTT_TUNING_DATA_VAL_MASK, reg);
+
+ return 0;
+}
+
+static int hisi_ptt_tune_data_set(struct hisi_ptt *hisi_ptt,
+ u32 event, u16 data)
+{
+ u32 reg;
+
+ reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
+ reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
+ reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
+ event);
+ writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
+
+ writel(FIELD_PREP(HISI_PTT_TUNING_DATA_VAL_MASK, data),
+ hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
+
+ if (!hisi_ptt_wait_tuning_finish(hisi_ptt))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static ssize_t hisi_ptt_tune_attr_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
+ struct dev_ext_attribute *ext_attr;
+ struct hisi_ptt_tune_desc *desc;
+ int ret;
+ u16 val;
+
+ ext_attr = container_of(attr, struct dev_ext_attribute, attr);
+ desc = ext_attr->var;
+
+ mutex_lock(&hisi_ptt->tune_lock);
+ ret = hisi_ptt_tune_data_get(hisi_ptt, desc->event_code, &val);
+ mutex_unlock(&hisi_ptt->tune_lock);
+
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%u\n", val);
+}
+
+static ssize_t hisi_ptt_tune_attr_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
+ struct dev_ext_attribute *ext_attr;
+ struct hisi_ptt_tune_desc *desc;
+ int ret;
+ u16 val;
+
+ ext_attr = container_of(attr, struct dev_ext_attribute, attr);
+ desc = ext_attr->var;
+
+ if (kstrtou16(buf, 10, &val))
+ return -EINVAL;
+
+ mutex_lock(&hisi_ptt->tune_lock);
+ ret = hisi_ptt_tune_data_set(hisi_ptt, desc->event_code, val);
+ mutex_unlock(&hisi_ptt->tune_lock);
+
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+#define HISI_PTT_TUNE_ATTR(_name, _val, _show, _store) \
+ static struct hisi_ptt_tune_desc _name##_desc = { \
+ .name = #_name, \
+ .event_code = _val, \
+ }; \
+ static struct dev_ext_attribute hisi_ptt_##_name##_attr = { \
+ .attr = __ATTR(_name, 0600, _show, _store), \
+ .var = &_name##_desc, \
+ }
+
+#define HISI_PTT_TUNE_ATTR_COMMON(_name, _val) \
+ HISI_PTT_TUNE_ATTR(_name, _val, \
+ hisi_ptt_tune_attr_show, \
+ hisi_ptt_tune_attr_store)
+
+/*
+ * The value of the tuning event are composed of two parts: main event code in bit[0,15] and
+ * subevent code in bit[16,23]. For example, qox_tx_cpl is a subevent of 'Tx path QoS control'
+ * which for tuning the weight of Tx completion TLPs. See hisi_ptt.rst documentation for
+ * more information.
+ */
+#define HISI_PTT_TUNE_QOS_TX_CPL (0x4 | (3 << 16))
+#define HISI_PTT_TUNE_QOS_TX_NP (0x4 | (4 << 16))
+#define HISI_PTT_TUNE_QOS_TX_P (0x4 | (5 << 16))
+#define HISI_PTT_TUNE_TX_PATH_IOB_RX_REQ_ALLOC_BUF_LEVEL (0x5 | (6 << 16))
+#define HISI_PTT_TUNE_TX_PATH_TX_REQ_ALLOC_BUF_LEVEL (0x5 | (7 << 16))
+
+HISI_PTT_TUNE_ATTR_COMMON(qos_tx_cpl,
+ HISI_PTT_TUNE_QOS_TX_CPL);
+HISI_PTT_TUNE_ATTR_COMMON(qos_tx_np,
+ HISI_PTT_TUNE_QOS_TX_NP);
+HISI_PTT_TUNE_ATTR_COMMON(qos_tx_p,
+ HISI_PTT_TUNE_QOS_TX_P);
+HISI_PTT_TUNE_ATTR_COMMON(tx_path_iob_rx_req_alloc_buf_level,
+ HISI_PTT_TUNE_TX_PATH_IOB_RX_REQ_ALLOC_BUF_LEVEL);
+HISI_PTT_TUNE_ATTR_COMMON(tx_path_tx_req_alloc_buf_level,
+ HISI_PTT_TUNE_TX_PATH_TX_REQ_ALLOC_BUF_LEVEL);
+
+static struct attribute *hisi_ptt_tune_attrs[] = {
+ &hisi_ptt_qos_tx_cpl_attr.attr.attr,
+ &hisi_ptt_qos_tx_np_attr.attr.attr,
+ &hisi_ptt_qos_tx_p_attr.attr.attr,
+ &hisi_ptt_tx_path_iob_rx_req_alloc_buf_level_attr.attr.attr,
+ &hisi_ptt_tx_path_tx_req_alloc_buf_level_attr.attr.attr,
+ NULL,
+};
+
+static struct attribute_group hisi_ptt_tune_group = {
+ .attrs = hisi_ptt_tune_attrs,
+ .name = "tune",
+};
+
static u16 hisi_ptt_get_filter_val(u16 devid, bool is_port)
{
if (is_port)
@@ -448,6 +603,7 @@ static const struct attribute_group *hisi_ptt_pmu_groups[] = {
&hisi_ptt_cpumask_attr_group,
&hisi_ptt_pmu_format_group,
&hisi_ptt_pmu_filter_group,
+ &hisi_ptt_tune_group,
NULL
};
@@ -783,6 +939,7 @@ static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
if (ret)
return ret;
+ mutex_init(&hisi_ptt->tune_lock);
spin_lock_init(&hisi_ptt->pmu_lock);
hisi_ptt->hisi_ptt_pmu = (struct pmu) {
diff --git a/drivers/hwtracing/ptt/hisi_ptt.h b/drivers/hwtracing/ptt/hisi_ptt.h
index 2344e4195648..439583e5fbcf 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.h
+++ b/drivers/hwtracing/ptt/hisi_ptt.h
@@ -12,6 +12,7 @@
#include <linux/bits.h>
#include <linux/cpumask.h>
#include <linux/list.h>
+#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/perf_event.h>
#include <linux/spinlock.h>
@@ -22,6 +23,11 @@
/*
* The definition of the device registers and register fields.
*/
+#define HISI_PTT_TUNING_CTRL 0x0000
+#define HISI_PTT_TUNING_CTRL_CODE GENMASK(15, 0)
+#define HISI_PTT_TUNING_CTRL_SUB GENMASK(23, 16)
+#define HISI_PTT_TUNING_DATA 0x0004
+#define HISI_PTT_TUNING_DATA_VAL_MASK GENMASK(15, 0)
#define HISI_PTT_TRACE_ADDR_SIZE 0x0800
#define HISI_PTT_TRACE_ADDR_BASE_LO_0 0x0810
#define HISI_PTT_TRACE_ADDR_BASE_HI_0 0x0814
@@ -37,6 +43,8 @@
#define HISI_PTT_TRACE_INT_STAT 0x0890
#define HISI_PTT_TRACE_INT_STAT_MASK GENMASK(3, 0)
#define HISI_PTT_TRACE_INT_MASK 0x0894
+#define HISI_PTT_TUNING_INT_STAT 0x0898
+#define HISI_PTT_TUNING_INT_STAT_MASK BIT(0)
#define HISI_PTT_TRACE_WR_STS 0x08a0
#define HISI_PTT_TRACE_WR_STS_WRITE GENMASK(27, 0)
#define HISI_PTT_TRACE_WR_STS_BUFFER GENMASK(29, 28)
@@ -59,6 +67,7 @@
#define HISI_PTT_RESET_TIMEOUT_US 10UL
#define HISI_PTT_RESET_POLL_INTERVAL_US 1UL
/* Poll timeout and interval for waiting hardware work to finish */
+#define HISI_PTT_WAIT_TUNE_TIMEOUT_US 1000000UL
#define HISI_PTT_WAIT_TRACE_TIMEOUT_US 100UL
#define HISI_PTT_WAIT_POLL_INTERVAL_US 10UL
@@ -71,6 +80,18 @@
#define HISI_PTT_PMU_TYPE_MASK GENMASK(31, 24)
#define HISI_PTT_PMU_FORMAT_MASK GENMASK(35, 32)
+/**
+ * struct hisi_ptt_tune_desc - Describe tune event for PTT tune
+ * @hisi_ptt: PTT device this tune event belongs to
+ * @name: name of this event
+ * @event_code: code of the event
+ */
+struct hisi_ptt_tune_desc {
+ struct hisi_ptt *hisi_ptt;
+ const char *name;
+ u32 event_code;
+};
+
/**
* struct hisi_ptt_dma_buffer - Describe a single trace buffer of PTT trace.
* The detail of the data format is described
@@ -144,6 +165,7 @@ struct hisi_ptt_pmu_buf {
* @hisi_ptt_pmu: the pum device of trace
* @iobase: base IO address of the device
* @pdev: pci_dev of this PTT device
+ * @tune_lock: lock to serialize the tune process
* @pmu_lock: lock to serialize the perf process
* @upper_bdf: the upper BDF range of the PCI devices managed by this PTT device
* @lower_bdf: the lower BDF range of the PCI devices managed by this PTT device
@@ -157,6 +179,7 @@ struct hisi_ptt {
struct pmu hisi_ptt_pmu;
void __iomem *iobase;
struct pci_dev *pdev;
+ struct mutex tune_lock;
spinlock_t pmu_lock;
u32 upper_bdf;
u32 lower_bdf;
--
2.24.0
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