From: Alexander Shishkin alexander.shishkin@linux.intel.com
mainline inclusion from mainline-v5.2-rc1 commit 8116db57cf1618cb21dab957952e7bd1395430da category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I47H3V CVE: NA
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Add support for asserting window switch trigger when tracing to MSU output ports. This allows for software controlled switching between windows of the MSU buffer, which can be used for double buffering while exporting the trace data further from the MSU.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Jackie Liu liuyun01@kylinos.cn Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hwtracing/intel_th/core.c | 25 ++++++++++++++++-- drivers/hwtracing/intel_th/gth.c | 37 +++++++++++++++++++++++++++ drivers/hwtracing/intel_th/gth.h | 19 ++++++++++++++ drivers/hwtracing/intel_th/intel_th.h | 6 +++++ 4 files changed, 85 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index b7bb258bcdd0..5cab5194c9b9 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -430,9 +430,9 @@ static const struct intel_th_subdevice { .nres = 1, .res = { { - /* Handle TSCU from GTH driver */ + /* Handle TSCU and CTS from GTH driver */ .start = REG_GTH_OFFSET, - .end = REG_TSCU_OFFSET + REG_TSCU_LENGTH - 1, + .end = REG_CTS_OFFSET + REG_CTS_LENGTH - 1, .flags = IORESOURCE_MEM, }, }, @@ -983,6 +983,27 @@ int intel_th_trace_enable(struct intel_th_device *thdev) } EXPORT_SYMBOL_GPL(intel_th_trace_enable);
+/** + * intel_th_trace_switch() - execute a switch sequence + * @thdev: output device that requests tracing switch + */ +int intel_th_trace_switch(struct intel_th_device *thdev) +{ + struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent); + struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver); + + if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH)) + return -EINVAL; + + if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT)) + return -EINVAL; + + hubdrv->trig_switch(hub, &thdev->output); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_th_trace_switch); + /** * intel_th_trace_disable() - disable tracing for an output device * @thdev: output device that requests tracing be disabled diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c index 94143ef0abaf..c9672b74761a 100644 --- a/drivers/hwtracing/intel_th/gth.c +++ b/drivers/hwtracing/intel_th/gth.c @@ -308,6 +308,11 @@ static int intel_th_gth_reset(struct gth_device *gth) iowrite32(0, gth->base + REG_GTH_SCR); iowrite32(0xfc, gth->base + REG_GTH_SCR2);
+ /* setup CTS for single trigger */ + iowrite32(CTS_EVENT_ENABLE_IF_ANYTHING, gth->base + REG_CTS_C0S0_EN); + iowrite32(CTS_ACTION_CONTROL_SET_STATE(CTS_STATE_IDLE) | + CTS_ACTION_CONTROL_TRIGGER, gth->base + REG_CTS_C0S0_ACT); + return 0; }
@@ -594,6 +599,37 @@ static void intel_th_gth_enable(struct intel_th_device *thdev, intel_th_gth_start(gth, output); }
+/** + * intel_th_gth_switch() - execute a switch sequence + * @thdev: GTH device + * @output: output device's descriptor + * + * This will execute a switch sequence that will trigger a switch window + * when tracing to MSC in multi-block mode. + */ +static void intel_th_gth_switch(struct intel_th_device *thdev, + struct intel_th_output *output) +{ + struct gth_device *gth = dev_get_drvdata(&thdev->dev); + unsigned long count; + u32 reg; + + /* trigger */ + iowrite32(0, gth->base + REG_CTS_CTL); + iowrite32(CTS_CTL_SEQUENCER_ENABLE, gth->base + REG_CTS_CTL); + /* wait on trigger status */ + for (reg = 0, count = CTS_TRIG_WAITLOOP_DEPTH; + count && !(reg & BIT(4)); count--) { + reg = ioread32(gth->base + REG_CTS_STAT); + cpu_relax(); + } + if (!count) + dev_dbg(&thdev->dev, "timeout waiting for CTS Trigger\n"); + + intel_th_gth_stop(gth, output, false); + intel_th_gth_start(gth, output); +} + /** * intel_th_gth_assign() - assign output device to a GTH output port * @thdev: GTH device @@ -777,6 +813,7 @@ static struct intel_th_driver intel_th_gth_driver = { .unassign = intel_th_gth_unassign, .set_output = intel_th_gth_set_output, .enable = intel_th_gth_enable, + .trig_switch = intel_th_gth_switch, .disable = intel_th_gth_disable, .driver = { .name = "gth", diff --git a/drivers/hwtracing/intel_th/gth.h b/drivers/hwtracing/intel_th/gth.h index 6f2b0b930875..bfcc0fd01177 100644 --- a/drivers/hwtracing/intel_th/gth.h +++ b/drivers/hwtracing/intel_th/gth.h @@ -49,6 +49,12 @@ enum { REG_GTH_SCRPD3 = 0xec, /* ScratchPad[3] */ REG_TSCU_TSUCTRL = 0x2000, /* TSCU control register */ REG_TSCU_TSCUSTAT = 0x2004, /* TSCU status register */ + + /* Common Capture Sequencer (CTS) registers */ + REG_CTS_C0S0_EN = 0x30c0, /* clause_event_enable_c0s0 */ + REG_CTS_C0S0_ACT = 0x3180, /* clause_action_control_c0s0 */ + REG_CTS_STAT = 0x32a0, /* cts_status */ + REG_CTS_CTL = 0x32a4, /* cts_control */ };
/* waiting for Pipeline Empty bit(s) to assert for GTH */ @@ -57,4 +63,17 @@ enum { #define TSUCTRL_CTCRESYNC BIT(0) #define TSCUSTAT_CTCSYNCING BIT(1)
+/* waiting for Trigger status to assert for CTS */ +#define CTS_TRIG_WAITLOOP_DEPTH 10000 + +#define CTS_EVENT_ENABLE_IF_ANYTHING BIT(31) +#define CTS_ACTION_CONTROL_STATE_OFF 27 +#define CTS_ACTION_CONTROL_SET_STATE(x) \ + (((x) & 0x1f) << CTS_ACTION_CONTROL_STATE_OFF) +#define CTS_ACTION_CONTROL_TRIGGER BIT(4) + +#define CTS_STATE_IDLE 0x10u + +#define CTS_CTL_SEQUENCER_ENABLE BIT(0) + #endif /* __INTEL_TH_GTH_H__ */ diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h index 74a6a4071e7f..0df480072b6c 100644 --- a/drivers/hwtracing/intel_th/intel_th.h +++ b/drivers/hwtracing/intel_th/intel_th.h @@ -164,6 +164,8 @@ struct intel_th_driver { struct intel_th_device *othdev); void (*enable)(struct intel_th_device *thdev, struct intel_th_output *output); + void (*trig_switch)(struct intel_th_device *thdev, + struct intel_th_output *output); void (*disable)(struct intel_th_device *thdev, struct intel_th_output *output); /* output ops */ @@ -228,6 +230,7 @@ int intel_th_driver_register(struct intel_th_driver *thdrv); void intel_th_driver_unregister(struct intel_th_driver *thdrv);
int intel_th_trace_enable(struct intel_th_device *thdev); +int intel_th_trace_switch(struct intel_th_device *thdev); int intel_th_trace_disable(struct intel_th_device *thdev); int intel_th_set_output(struct intel_th_device *thdev, unsigned int master); @@ -308,6 +311,9 @@ enum { REG_TSCU_OFFSET = 0x2000, REG_TSCU_LENGTH = 0x1000,
+ REG_CTS_OFFSET = 0x3000, + REG_CTS_LENGTH = 0x1000, + /* Software Trace Hub (STH) [0x4000..0x4fff] */ REG_STH_OFFSET = 0x4000, REG_STH_LENGTH = 0x2000,