[PATCH v3 16/20] coresight: allow cti to be built as a module
Mike Leach
mike.leach at linaro.org
Mon Jul 20 13:00:03 EDT 2020
Hi,
Once again testing on DB410c.
The following sequence:-
root at linaro-developer:/home/linaro/cs-mods# insmod coresight.ko
root at linaro-developer:/home/linaro/cs-mods# insmod coresight-etm4x.ko
root at linaro-developer:/home/linaro/cs-mods# insmod coresight-cti.ko
root at linaro-developer:/home/linaro/cs-mods# rmmod coresight-cti.ko
results in:-
This in my command console:-
Message from syslogd at linaro-developer at Jul 20 16:51:40 ...
kernel:[ 188.838141] Internal error: Oops: 96000004 [#1] SMP
Segmentation fault
root at linaro-developer:/home/linaro/cs-mods#
Message from syslogd at linaro-developer at Jul 20 16:51:40 ...
kernel:[ 189.063920] Code: aa0203f6 aa0103f7 aa1e03e0 d503201f (7940e260)
AND this in the boot console:-
root at 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 at linaro-developer at Jul 20 16:51:40 ...
kernel:[ 188.838141] Internal error: Oops: 96000004 [#1] SMP
Message from syslogd at 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 at 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 at 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: the
> + module 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 at 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 at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
More information about the linux-arm-kernel
mailing list