Hi,
I've further looked into this - there is a bug in the CTI driver cleanup that is unrelated to the module work. I will issue a patch to fix.
Regards
Mike
On Mon, 20 Jul 2020 at 18:00, Mike Leach mike.leach@linaro.org wrote:
Hi,
Once again testing on DB410c.
The following sequence:-
root@linaro-developer:/home/linaro/cs-mods# insmod coresight.ko root@linaro-developer:/home/linaro/cs-mods# insmod coresight-etm4x.ko root@linaro-developer:/home/linaro/cs-mods# insmod coresight-cti.ko root@linaro-developer:/home/linaro/cs-mods# rmmod coresight-cti.ko
results in:-
This in my command console:-
Message from syslogd@linaro-developer at Jul 20 16:51:40 ... kernel:[ 188.838141] Internal error: Oops: 96000004 [#1] SMP Segmentation fault root@linaro-developer:/home/linaro/cs-mods# Message from syslogd@linaro-developer at Jul 20 16:51:40 ... kernel:[ 189.063920] Code: aa0203f6 aa0103f7 aa1e03e0 d503201f (7940e260)
AND this in the boot console:-
root@linaro-developer:~# [ 188.804340] Unable to handle kernel paging request at virtual address 97e3327491382070 [ 188.804370] Mem abort info: [ 188.811217] ESR = 0x96000004 [ 188.813832] EC = 0x25: DABT (current EL), IL = 32 bits [ 188.817009] SET = 0, FnV = 0 [ 188.822448] EA = 0, S1PTW = 0 [ 188.825284] Data abort info: [ 188.828346] ISV = 0, ISS = 0x00000004 [ 188.831471] CM = 0, WnR = 0 [ 188.835029] [97e3327491382070] address between user and kernel address ranges [ 188.838141] Internal error: Oops: 96000004 [#1] SMP [ 188.845252] Modules linked in: coresight_cti(-) coresight_etm4x coresight [ 188.849947] CPU: 2 PID: 4233 Comm: rmmod Not tainted 5.8.0-rc5cs-modscs-mods-00021-gcac254d1f7cc-dirty #284 [ 188.856890] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) [ 188.866439] pstate: 60000005 (nZCv daif -PAN -UAO BTYPE=--) [ 188.873387] pc : kernfs_find_ns+0x28/0x120 [ 188.878673] lr : kernfs_find_and_get_ns+0x44/0x68 [ 188.882838] sp : ffff000034e77b00 [ 188.887611] x29: ffff000034e77b00 x28: ffff000034d50d80 [ 188.890912] x27: 0000000000000000 x26: 0000000000000000 [ 188.896294] x25: 0000000000000000 x24: ffff0000382aa898 [ 188.901589] x23: ffff800008d84938 x22: 0000000000000000 [ 188.906883] x21: ffff800008d84938 x20: 97e3327491382000 [ 188.912179] x19: 97e3327491382000 x18: ffffffffffffffff [ 188.917473] x17: 0000000000000000 x16: 0000000000000000 [ 188.922770] x15: ffff800011609948 x14: 0000000000000040 [ 188.928064] x13: 0000000000000228 x12: 0000000000000008 [ 188.933360] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f [ 188.938654] x9 : 0000001d9cd9e3a6 x8 : 0000b790773d66d4 [ 188.943950] x7 : 0000000000000002 x6 : ffff0000382a8ed4 [ 188.949244] x5 : 0000000000000000 x4 : ffff0000382a8ed4 [ 188.954540] x3 : 0000000000000000 x2 : 0000000000000000 [ 188.959836] x1 : ffff800008d84938 x0 : ffff8000103609fc [ 188.965131] Call trace: [ 188.970428] kernfs_find_ns+0x28/0x120 [ 188.972596] kernfs_find_and_get_ns+0x44/0x68 [ 188.976419] sysfs_remove_link_from_group+0x34/0x60 [ 188.980857] coresight_remove_sysfs_link+0x4c/0x88 [coresight] [ 188.985541] cti_device_release+0x7c/0x170 [coresight_cti] [ 188.991435] device_release+0x34/0x90 [ 188.996905] kobject_put+0x70/0x200 [ 189.000634] device_unregister+0x30/0x78 [ 189.003942] coresight_unregister+0x60/0x70 [coresight] [ 189.008107] cti_remove+0x14/0x20 [coresight_cti] [ 189.013050] amba_remove+0x34/0x1a0 [ 189.017910] device_release_driver_internal+0x100/0x1b8 [ 189.021210] driver_detach+0xa8/0x178 [ 189.026417] bus_remove_driver+0x64/0x100 [ 189.030237] driver_unregister+0x34/0x60 [ 189.034228] amba_driver_unregister+0x20/0x30 [ 189.038228] cti_exit+0x1c/0xd60 [coresight_cti] [ 189.042478] __arm64_sys_delete_module+0x1c0/0x280 [ 189.047167] el0_svc_common.constprop.3+0xc8/0x170 [ 189.051765] do_el0_svc+0x34/0xc0 [ 189.056538] el0_sync_handler+0x144/0x1c0 [ 189.059923] el0_sync+0x140/0x180 [ 189.063920] Code: aa0203f6 aa0103f7 aa1e03e0 d503201f (7940e260) [ 189.067218] ---[ end trace 05494e5d41cb7242 ]---
Message from syslogd@linaro-developer at Jul 20 16:51:40 ... kernel:[ 188.838141] Internal error: Oops: 96000004 [#1] SMP
Message from syslogd@linaro-developer at Jul 20 16:51:40 ... kernel:[ 189.063920] Code: aa0203f6 aa0103f7 aa1e03e0 d503201f (7940e260)
Looks to be in the code that maintains the sysfs connections between the devices. I haven't looked deeper than that.
Regards
Mike
On Fri, 17 Jul 2020 at 06:49, Tingwei Zhang tingwei@codeaurora.org wrote:
Allow to build coresight-cti as a module, for ease of development.
- Kconfig becomes a tristate, to allow =m
- append -core to source file name to allow module to be called coresight-cti by the Makefile
- add an cti_remove function, for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot
Signed-off-by: Tingwei Zhang tingwei@codeaurora.org
drivers/hwtracing/coresight/Kconfig | 5 ++++- drivers/hwtracing/coresight/Makefile | 4 ++-- .../{coresight-cti.c => coresight-cti-core.c} | 14 ++++++++++++++ drivers/hwtracing/coresight/coresight-platform.c | 1 + drivers/hwtracing/coresight/coresight.c | 1 + 5 files changed, 22 insertions(+), 3 deletions(-) rename drivers/hwtracing/coresight/{coresight-cti.c => coresight-cti-core.c} (98%)
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index f31778dd0b5d..b04aae2ceecc 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -136,7 +136,7 @@ config CORESIGHT_CPU_DEBUG module will be called coresight-cpu-debug.
config CORESIGHT_CTI
bool "CoreSight Cross Trigger Interface (CTI) driver"
tristate "CoreSight Cross Trigger Interface (CTI) driver" depends on ARM || ARM64 help This driver provides support for CoreSight CTI and CTM components.@@ -147,6 +147,9 @@ config CORESIGHT_CTI halt compared to disabling sources and sinks normally in driver software.
To compile this driver as a module, choose M here: themodule will be called coresight-cti.config CORESIGHT_CTI_INTEGRATION_REGS bool "Access CTI CoreSight Integration Registers" depends on CORESIGHT_CTI diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index f2a568b969c4..0359d5a1588f 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -19,6 +19,6 @@ coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o -obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o \
coresight-cti-platform.o \+obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o +coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \ coresight-cti-sysfs.o diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti-core.c similarity index 98% rename from drivers/hwtracing/coresight/coresight-cti.c rename to drivers/hwtracing/coresight/coresight-cti-core.c index 289b356a64a5..0f8fbe41363a 100644 --- a/drivers/hwtracing/coresight/coresight-cti.c +++ b/drivers/hwtracing/coresight/coresight-cti-core.c @@ -817,6 +817,14 @@ static void cti_device_release(struct device *dev) if (drvdata->csdev_release) drvdata->csdev_release(dev); } +static int __exit cti_remove(struct amba_device *adev) +{
struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev);coresight_unregister(drvdata->csdev);return 0;+}
static int cti_probe(struct amba_device *adev, const struct amba_id *id) { @@ -957,6 +965,7 @@ static const struct amba_id cti_ids[] = { CS_AMBA_UCI_ID(0x000bb9ed, uci_id_cti), /* Coresight CTI (SoC 600) */ { 0, 0}, }; +MODULE_DEVICE_TABLE(amba, cti_ids);
static struct amba_driver cti_driver = { .drv = { @@ -965,6 +974,7 @@ static struct amba_driver cti_driver = { .suppress_bind_attrs = true, }, .probe = cti_probe,
.remove = cti_remove, .id_table = cti_ids,};
@@ -987,3 +997,7 @@ static void __exit cti_exit(void)
module_init(cti_init); module_exit(cti_exit);
+MODULE_AUTHOR("Mike Leach mike.leach@linaro.org"); +MODULE_DESCRIPTION("Arm CoreSight CTI Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c index e4912abda3aa..70477a256be3 100644 --- a/drivers/hwtracing/coresight/coresight-platform.c +++ b/drivers/hwtracing/coresight/coresight-platform.c @@ -76,6 +76,7 @@ coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode) } return csdev; } +EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
#ifdef CONFIG_OF static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep) diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index b814ca54acc9..55b699aca9ec 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -273,6 +273,7 @@ void coresight_set_assoc_ectdev_mutex(struct coresight_device *csdev, csdev->ect_dev = ect_csdev; mutex_unlock(&coresight_mutex); } +EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
static int coresight_enable_sink(struct coresight_device *csdev, u32 mode, void *data) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
-- Mike Leach Principal Engineer, ARM Ltd. Manchester Design Centre. UK