I did some testing and I was able to crash the system by removing drivers from an active path. Before going ahead with a driver removal the drvdata->mode needs to be checked. The structure 'mode' already present for source and sinks. The TMC used as link or sink is also fine since it's already using a drvdata->mode (though I just noticed a problem when multiple paths are going through the same TMC link - that won't affect you).
Funnel and replicator need to be enhanced with a reference count that gets incremented when a port is enabled (and vice versa). For as long as the reference count is not zero the driver can't be removed. I'm pretty sure sound drivers already do something similar, it's a matter of doing the same. I'm also open to a different suggestion should you find something better.
The thought stayed with me so I decided to look around a little. Sure enough this is a well known problem and has been addressed everywhere by using the try_module_get()/module_put() functions. I did a little experiment with the funnel driver and things work as advertised.
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c index bb87902c4f28..1fbd7eb927f7 100644 --- a/drivers/hwtracing/coresight/coresight-funnel.c +++ b/drivers/hwtracing/coresight/coresight-funnel.c @@ -69,6 +69,10 @@ static int funnel_enable(struct coresight_device *csdev, int inport, int outport) { struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct module *module = csdev->dev.parent->driver->owner; + + if (!try_module_get(module)) + return -ENODEV;
funnel_enable_hw(drvdata, inport);
@@ -93,9 +97,11 @@ static void funnel_disable(struct coresight_device *csdev, int inport, int outport) { struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct module *module = csdev->dev.parent->driver->owner;
funnel_disable_hw(drvdata, inport);
+ module_put(module); dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport); }
+coresight-link-sink-tmc-objs := coresight-tmc.o \
coresight-tmc-etf.o \coresight-tmc-etr.oobj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \ coresight-replicator.o -obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm-cp14.o \
coresight-etm3x-sysfs.o-obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o \
coresight-etm4x-sysfs.o+obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x-core.o +coresight-etm3x-core-objs := coresight-etm3x.o \
coresight-etm-cp14.o \coresight-etm3x-sysfs.o+obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x-core.o
+coresight-etm4x-core-objs := coresight-etm4x.o coresight-etm4x-sysfs.o
obj-$(CONFIG_CORESIGHT_DYNAMIC_REPLICATOR) += coresight-dynamic-replicator.o obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c index 9cdb3fbc8c1f..ff6d3be1b13c 100644 --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c @@ -683,6 +683,8 @@ static const struct amba_id debug_ids[] = { { 0, 0 }, };
+MODULE_DEVICE_TABLE(amba, debug_ids);
static struct amba_driver debug_driver = { .drv = { .name = "coresight-cpu-debug", diff --git a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c index 043da86b0fe9..a7f486a577b0 100644 --- a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c +++ b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c @@ -167,6 +167,15 @@ static int replicator_probe(struct amba_device *adev, const struct amba_id *id) return PTR_ERR_OR_ZERO(drvdata->csdev); }
+static int __exit replicator_remove(struct amba_device *adev) +{
struct replicator_state *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int replicator_runtime_suspend(struct device *dev) { @@ -208,6 +217,8 @@ static const struct amba_id replicator_ids[] = { { 0, 0 }, };
+MODULE_DEVICE_TABLE(amba, replicator_ids);
static struct amba_driver replicator_driver = { .drv = { .name = "coresight-dynamic-replicator", @@ -215,6 +226,11 @@ static struct amba_driver replicator_driver = { .suppress_bind_attrs = true, }, .probe = replicator_probe,
.remove = replicator_remove, .id_table = replicator_ids,}; -builtin_amba_driver(replicator_driver); +module_amba_driver(replicator_driver);
+MODULE_AUTHOR("Suzuki K Poulose suzuki.poulose@arm.com"); +MODULE_DESCRIPTION("ARM Coresight Dynamic Replicator Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 580cd381adf3..f5464556b8e7 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -719,6 +719,15 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int __exit etb_remove(struct amba_device *adev) +{
struct etb_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int etb_runtime_suspend(struct device *dev) { @@ -753,6 +762,8 @@ static const struct amba_id etb_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, etb_ids);
static struct amba_driver etb_driver = { .drv = { .name = "coresight-etb10", @@ -762,6 +773,12 @@ static struct amba_driver etb_driver = {
}, .probe = etb_probe,
.remove = etb_remove, .id_table = etb_ids,}; -builtin_amba_driver(etb_driver); +module_amba_driver(etb_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight Embedded Trace Buffer driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm-cp14.c b/drivers/hwtracing/coresight/coresight-etm-cp14.c index 12a220682117..1e16a6358364 100644 --- a/drivers/hwtracing/coresight/coresight-etm-cp14.c +++ b/drivers/hwtracing/coresight/coresight-etm-cp14.c @@ -589,3 +589,7 @@ int etm_writel_cp14(u32 reg, u32 val)
return 0;}
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_DESCRIPTION("Arm CoreSight ETM CP14 driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 4e5ed6597f2f..152f2ae49665 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -477,6 +477,7 @@ int etm_perf_symlink(struct coresight_device *csdev, bool link)
return 0;} +EXPORT_SYMBOL_GPL(etm_perf_symlink);
static int __init etm_perf_init(void) { @@ -504,4 +505,14 @@ static int __init etm_perf_init(void)
return ret;} -device_initcall(etm_perf_init); +module_init(etm_perf_init);
+static void __exit etm_perf_exit(void) +{
perf_pmu_unregister(&etm_pmu);+} +module_exit(etm_perf_exit);
+MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight tracer perf driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h index 3ffc9feb2d64..8c49c7b82d84 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.h +++ b/drivers/hwtracing/coresight/coresight-etm-perf.h @@ -54,7 +54,7 @@ struct etm_filters { };
-#ifdef CONFIG_CORESIGHT +#if IS_ENABLED(CONFIG_CORESIGHT) int etm_perf_symlink(struct coresight_device *csdev, bool link);
#else diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c index 6e547ec6fead..65cfec6e1749 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c @@ -17,6 +17,7 @@
#include <linux/pm_runtime.h> #include <linux/sysfs.h> +#include <linux/coresight.h> #include "coresight-etm.h" #include "coresight-priv.h"
@@ -1274,3 +1275,8 @@ const struct attribute_group *coresight_etm_groups[] = { &coresight_etm_mgmt_group, NULL, };
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace sysfs driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index 39f42fdd503d..b1e3fd7ed059 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -873,6 +873,15 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int __exit etm_remove(struct amba_device *adev) +{
struct etm_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int etm_runtime_suspend(struct device *dev) { @@ -933,6 +942,8 @@ static const struct amba_id etm_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, etm_ids);
static struct amba_driver etm_driver = { .drv = { .name = "coresight-etm3x", @@ -941,6 +952,12 @@ static struct amba_driver etm_driver = { .suppress_bind_attrs = true, }, .probe = etm_probe,
.remove = etm_remove, .id_table = etm_ids,}; -builtin_amba_driver(etm_driver); +module_amba_driver(etm_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index d21961710713..04119b963454 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -17,6 +17,7 @@
#include <linux/pm_runtime.h> #include <linux/sysfs.h> +#include <linux/coresight.h> #include "coresight-etm4x.h" #include "coresight-priv.h"
@@ -2155,3 +2156,8 @@ const struct attribute_group *coresight_etmv4_groups[] = { &coresight_etmv4_trcidr_group, NULL, }; +EXPORT_SYMBOL_GPL(coresight_etmv4_groups);
+MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4 sysfs driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index cf364a514c12..89b6afe46b79 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -1052,6 +1052,15 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int __exit etm4_remove(struct amba_device *adev) +{
struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
static const struct amba_id etm4_ids[] = { { /* ETM 4.0 - Cortex-A53 */ .id = 0x000bb95d, @@ -1071,12 +1080,21 @@ static const struct amba_id etm4_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, etm4_ids);
static struct amba_driver etm4x_driver = { .drv = { .name = "coresight-etm4x",
.owner = THIS_MODULE, .suppress_bind_attrs = true, }, .probe = etm4_probe,.remove = etm4_remove, .id_table = etm4_ids,}; -builtin_amba_driver(etm4x_driver); +module_amba_driver(etm4x_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4 driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c index 9f8ac0bef853..bb87902c4f28 100644 --- a/drivers/hwtracing/coresight/coresight-funnel.c +++ b/drivers/hwtracing/coresight/coresight-funnel.c @@ -218,6 +218,15 @@ static int funnel_probe(struct amba_device *adev, const struct amba_id *id) return PTR_ERR_OR_ZERO(drvdata->csdev); }
+static int __exit funnel_remove(struct amba_device *adev) +{
struct funnel_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int funnel_runtime_suspend(struct device *dev) { @@ -257,6 +266,8 @@ static const struct amba_id funnel_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, funnel_ids);
static struct amba_driver funnel_driver = { .drv = { .name = "coresight-funnel", @@ -265,6 +276,11 @@ static struct amba_driver funnel_driver = { .suppress_bind_attrs = true, }, .probe = funnel_probe,
.remove = funnel_remove, .id_table = funnel_ids,}; -builtin_amba_driver(funnel_driver); +module_amba_driver(funnel_driver);
+MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("ARM Coresight Funnel Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index f1d0e21d8cab..335bca44b42d 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -64,7 +64,13 @@ static DEVICE_ATTR_RO(name) #define coresight_simple_reg64(type, name, lo_off, hi_off) \ __coresight_simple_func(type, NULL, name, lo_off, hi_off)
-extern const u32 barrier_pkt[5]; +/*
- When losing synchronisation a new barrier packet needs to be inserted at the
- beginning of the data collected in a buffer. That way the decoder knows that
- it needs to look for another sync sequence.
- */
+static const u32 barrier_pkt[5] = {0x7fffffff, 0x7fffffff,
0x7fffffff, 0x7fffffff, 0x0};enum etm_addr_type { ETM_ADDR_TYPE_NONE, @@ -143,7 +149,7 @@ struct list_head *coresight_build_path(struct coresight_device *csdev, struct coresight_device *sink); void coresight_release_path(struct list_head *path);
-#ifdef CONFIG_CORESIGHT_SOURCE_ETM3X +#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X) extern int etm_readl_cp14(u32 off, unsigned int *val); extern int etm_writel_cp14(u32 off, u32 val); #else diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c index 3756e71cb8f5..f17975d20dc1 100644 --- a/drivers/hwtracing/coresight/coresight-replicator.c +++ b/drivers/hwtracing/coresight/coresight-replicator.c @@ -119,6 +119,15 @@ static int replicator_probe(struct platform_device *pdev) return ret; }
+static int __exit replicator_remove(struct platform_device *pdev) +{
struct replicator_drvdata *drvdata = dev_get_drvdata(&pdev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int replicator_runtime_suspend(struct device *dev) { @@ -151,8 +160,11 @@ static const struct of_device_id replicator_match[] = { {} };
+MODULE_DEVICE_TABLE(of, replicator_match);
static struct platform_driver replicator_driver = { .probe = replicator_probe,
.remove = replicator_remove, .driver = { .name = "coresight-replicator", .of_match_table = replicator_match,@@ -160,4 +172,9 @@ static struct platform_driver replicator_driver = { .suppress_bind_attrs = true, }, }; -builtin_platform_driver(replicator_driver); +module_platform_driver(replicator_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("ARM Coresight Replicator Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c index 15e7ef3891f5..4a4a4e809cef 100644 --- a/drivers/hwtracing/coresight/coresight-stm.c +++ b/drivers/hwtracing/coresight/coresight-stm.c @@ -889,6 +889,17 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int __exit stm_remove(struct amba_device *adev) +{
struct stm_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);stm_unregister_device(&drvdata->stm);return 0;+}
#ifdef CONFIG_PM static int stm_runtime_suspend(struct device *dev) { @@ -929,6 +940,8 @@ static const struct amba_id stm_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, stm_ids);
static struct amba_driver stm_driver = { .drv = { .name = "coresight-stm", @@ -937,7 +950,12 @@ static struct amba_driver stm_driver = { .suppress_bind_attrs = true, }, .probe = stm_probe,
.remove = stm_remove, .id_table = stm_ids,};
-builtin_amba_driver(stm_driver); +module_amba_driver(stm_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_DESCRIPTION("Arm CoreSight System Trace Macrocell driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index e2513b786242..971f04d1a5b4 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -628,3 +628,5 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
return 0;}
+MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 68fbc8f7450e..77793bfce412 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -342,3 +342,5 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
return 0;}
+MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c index 0ea04f588de0..553885db2daa 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.c +++ b/drivers/hwtracing/coresight/coresight-tmc.c @@ -437,6 +437,16 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) return ret; }
+static int __exit tmc_remove(struct amba_device *adev) +{
struct tmc_drvdata *drvdata = dev_get_drvdata(&adev->dev);misc_deregister(&drvdata->miscdev);coresight_unregister(drvdata->csdev);return 0;+}
static const struct amba_id tmc_ids[] = { { .id = 0x000bb961, @@ -461,6 +471,8 @@ static const struct amba_id tmc_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, tmc_ids);
static struct amba_driver tmc_driver = { .drv = { .name = "coresight-tmc", @@ -468,6 +480,11 @@ static struct amba_driver tmc_driver = { .suppress_bind_attrs = true, }, .probe = tmc_probe,
.remove = tmc_remove, .id_table = tmc_ids,}; -builtin_amba_driver(tmc_driver); +module_amba_driver(tmc_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_DESCRIPTION("Arm CoreSight Trace Memory Controller driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c index 805f7c2210fe..6eff26f769a8 100644 --- a/drivers/hwtracing/coresight/coresight-tpiu.c +++ b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -171,6 +171,15 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) return PTR_ERR_OR_ZERO(drvdata->csdev); }
+static int __exit tpiu_remove(struct amba_device *adev) +{
struct tpiu_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
#ifdef CONFIG_PM static int tpiu_runtime_suspend(struct device *dev) { @@ -214,6 +223,8 @@ static const struct amba_id tpiu_ids[] = { { 0, 0}, };
+MODULE_DEVICE_TABLE(amba, tpiu_ids);
static struct amba_driver tpiu_driver = { .drv = { .name = "coresight-tpiu", @@ -222,6 +233,12 @@ static struct amba_driver tpiu_driver = { .suppress_bind_attrs = true, }, .probe = tpiu_probe,
.remove = tpiu_remove, .id_table = tpiu_ids,}; -builtin_amba_driver(tpiu_driver); +module_amba_driver(tpiu_driver);
+MODULE_AUTHOR("Pratik Patel pratikp@codeaurora.org"); +MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 389c4baeca9d..5da8c3daba95 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -24,9 +24,32 @@ #include <linux/of_platform.h> #include <linux/delay.h> #include <linux/pm_runtime.h> +#include <linux/sched.h>
#include "coresight-priv.h"
+#ifdef CONFIG_PID_NS +unsigned long coresight_vpid_to_pid(unsigned long vpid) +{
struct task_struct *task = NULL;unsigned long pid = 0;rcu_read_lock();task = find_task_by_vpid(vpid);if (task)pid = task_pid_nr(task);rcu_read_unlock();return pid;+} +#else +unsigned long coresight_vpid_to_pid(unsigned long vpid) +{
return vpid;+} +#endif +EXPORT_SYMBOL_GPL(coresight_vpid_to_pid);
static DEFINE_MUTEX(coresight_mutex);
/** @@ -53,14 +76,6 @@ static DEFINE_PER_CPU(struct list_head *, tracer_path); */ static struct list_head *stm_path;
-/*
- When losing synchronisation a new barrier packet needs to be inserted at the
- beginning of the data collected in a buffer. That way the decoder knows that
- it needs to look for another sync sequence.
- */
-const u32 barrier_pkt[5] = {0x7fffffff, 0x7fffffff,
0x7fffffff, 0x7fffffff, 0x0};static int coresight_id_match(struct device *dev, void *data) { int trace_id, i_trace_id; @@ -317,6 +332,7 @@ void coresight_disable_path(struct list_head *path) } } } +EXPORT_SYMBOL_GPL(coresight_disable_path);
int coresight_enable_path(struct list_head *path, u32 mode) { @@ -368,6 +384,7 @@ int coresight_enable_path(struct list_head *path, u32 mode) coresight_disable_path(path); goto out; } +EXPORT_SYMBOL_GPL(coresight_enable_path);
struct coresight_device *coresight_get_sink(struct list_head *path) { @@ -383,6 +400,7 @@ struct coresight_device *coresight_get_sink(struct list_head *path)
return csdev;} +EXPORT_SYMBOL_GPL(coresight_get_sink);
static int coresight_enabled_sink(struct device *dev, void *data) { @@ -407,6 +425,7 @@ static int coresight_enabled_sink(struct device *dev, void *data)
return 0;} +EXPORT_SYMBOL_GPL(coresight_enabled_sink);
/**
- coresight_get_enabled_sink - returns the first enabled sink found on the bus
@@ -429,6 +448,7 @@ struct coresight_device *coresight_get_enabled_sink(bool deactivate)
return dev ? to_coresight_device(dev) : NULL;} +EXPORT_SYMBOL_GPL(coresight_get_enabled_sink);
/**
- _coresight_build_path - recursively build a path from a @csdev to a sink.
@@ -508,6 +528,7 @@ struct list_head *coresight_build_path(struct coresight_device *source,
return path;} +EXPORT_SYMBOL_GPL(coresight_build_path);
/**
- coresight_release_path - release a previously built path.
@@ -532,6 +553,7 @@ void coresight_release_path(struct list_head *path) kfree(path); path = NULL; } +EXPORT_SYMBOL_GPL(coresight_release_path);
/** coresight_validate_source - make sure a source has the right credentials
- @csdev: the device structure for a source.
@@ -948,6 +970,7 @@ int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
return -EAGAIN;} +EXPORT_SYMBOL_GPL(coresight_timeout);
struct bus_type coresight_bustype = { .name = "coresight", @@ -959,6 +982,12 @@ static int __init coresight_init(void) } postcore_initcall(coresight_init);
+static void __exit coresight_exit(void) +{
bus_unregister(&coresight_bustype);+} +module_exit(coresight_exit);
struct coresight_device *coresight_register(struct coresight_desc *desc) { int i; @@ -1056,3 +1085,7 @@ void coresight_unregister(struct coresight_device *csdev) device_unregister(&csdev->dev); } EXPORT_SYMBOL_GPL(coresight_unregister);
+MODULE_AUTHOR("Mathieu Poirier mathieu.poirier@linaro.org"); +MODULE_DESCRIPTION("ARM Coresight Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index d950dad5056a..5863eb1a7335 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -243,7 +243,7 @@ struct coresight_ops { const struct coresight_ops_source *source_ops; };
-#ifdef CONFIG_CORESIGHT +#if IS_ENABLED(CONFIG_CORESIGHT) extern struct coresight_device * coresight_register(struct coresight_desc *desc); extern void coresight_unregister(struct coresight_device *csdev); @@ -274,24 +274,5 @@ static inline struct coresight_platform_data *of_get_coresight_platform_data( struct device *dev, const struct device_node *node) { return NULL; } #endif
-#ifdef CONFIG_PID_NS -static inline unsigned long -coresight_vpid_to_pid(unsigned long vpid) -{
struct task_struct *task = NULL;unsigned long pid = 0;rcu_read_lock();task = find_task_by_vpid(vpid);if (task)pid = task_pid_nr(task);rcu_read_unlock();return pid;-} -#else -static inline unsigned long -coresight_vpid_to_pid(unsigned long vpid) { return vpid; } -#endif
+extern unsigned long coresight_vpid_to_pid(unsigned long vpid);
#endif
2.16.2