CoreSight March 2022

coresight@lists.linaro.org

10 participants
27 discussions

[PATCH 1/3] perf test: Shell - Limit to only run executable scripts in tests

by carsten.haitzler＠foss.arm.com

From: Carsten Haitzler <carsten.haitzler(a)arm.com> Perf test's shell runner will just run everything in the tests directory (as long as it's not another directory or does not begin with a dot), but sometimes you find files in there that are not shell scripts - perf.data output for example if you do some testing and then the next time you run perf test it tries to run these. Check the files are executable so they are actually intended to be test scripts and not just some "random junk" files there. Signed-off-by: Carsten Haitzler <carsten.haitzler(a)arm.com> --- tools/perf/tests/builtin-test.c | 4 +++- tools/perf/util/path.c | 14 +++++++++++++- tools/perf/util/path.h | 1 + 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index fac3717d9ba1..3c34cb766724 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -296,7 +296,9 @@ static const char *shell_test__description(char *description, size_t size, #define for_each_shell_test(entlist, nr, base, ent) \ for (int __i = 0; __i < nr && (ent = entlist[__i]); __i++) \ - if (!is_directory(base, ent) && ent->d_name[0] != '.') + if (!is_directory(base, ent) && \ + is_executable_file(base, ent) && \ + ent->d_name[0] != '.') static const char *shell_tests__dir(char *path, size_t size) { diff --git a/tools/perf/util/path.c b/tools/perf/util/path.c index caed0336429f..ce80b79be103 100644 --- a/tools/perf/util/path.c +++ b/tools/perf/util/path.c @@ -86,9 +86,21 @@ bool is_directory(const char *base_path, const struct dirent *dent) char path[PATH_MAX]; struct stat st; - sprintf(path, "%s/%s", base_path, dent->d_name); + snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name); if (stat(path, &st)) return false; return S_ISDIR(st.st_mode); } + +bool is_executable_file(const char *base_path, const struct dirent *dent) +{ + char path[PATH_MAX]; + struct stat st; + + snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name); + if (stat(path, &st)) + return false; + + return !S_ISDIR(st.st_mode) && (st.st_mode & S_IXUSR); +} diff --git a/tools/perf/util/path.h b/tools/perf/util/path.h index 083429b7efa3..d94902c22222 100644 --- a/tools/perf/util/path.h +++ b/tools/perf/util/path.h @@ -12,5 +12,6 @@ int path__join3(char *bf, size_t size, const char *path1, const char *path2, con bool is_regular_file(const char *file); bool is_directory(const char *base_path, const struct dirent *dent); +bool is_executable_file(const char *base_path, const struct dirent *dent); #endif /* _PERF_PATH_H */ -- 2.32.0

2 years, 6 months

[PATCH 00/10] coresight: Add new API to allocate trace source ID values

by Mike Leach

The current method for allocating trace source ID values to sources is to use a fixed algorithm for CPU based sources of (cpu_num * 2 + 0x10). The STM is allocated ID 0x1. This fixed algorithm is used in both the CoreSight driver code, and by perf when writing the trace metadata in the AUXTRACE_INFO record. The method needs replacing as currently:- 1. It is inefficient in using available IDs. 2. Does not scale to larger systems with many cores and the algorithm has no limits so will generate invalid trace IDs for cpu number > 44. Additionally requirements to allocate additional system IDs on some systems have been seen. This patch set introduces an API that allows the allocation of trace IDs in a dynamic manner. Architecturally reserved IDs are never allocated, and the system is limited to allocating only valid IDs. Each of the current trace sources ETM3.x, ETM4.x and STM is updated to use the new API. perf handling is changed so that the ID associated with the CPU is read from sysfs. The ID allocator is notified when perf events start and stop so CPU based IDs are kept constant throughout any perf session. For the ETMx.x devices IDs are allocated on certain events a) When using sysfs, an ID will be allocated on hardware enable, and freed when the sysfs reset is written. b) When using perf, ID is allocated on hardware enable, and freed on hardware disable. For both cases the ID is allocated when sysfs is read to get the current trace ID. This ensures that consistent decode metadata can be extracted from the system where this read occurs before device enable. Note: This patchset breaks backward compatibility for perf record. Because the method for generating the AUXTRACE_INFO meta data has changed, using an older perf record will result in metadata that does not match the trace IDs used in the recorded trace data. This mismatch will cause subsequent decode to fail. Older versions of perf will still be able to decode data generated by the updated system. Applies to coresight/next [b54f53bc11a5] Tested on DB410c Mike Leach (10): coresight: trace-id: Add API to dynamically assign trace ID values coresight: trace-id: Set up source trace ID map for system coresight: stm: Update STM driver to use Trace ID api coresight: etm4x: Use trace ID API to dynamically allocate trace ID coresight: etm3x: Use trace ID API to allocate IDs coresight: perf: traceid: Add perf notifiers for trace ID perf: cs-etm: Update event to read trace ID from sysfs coresight: Remove legacy Trace ID allocation mechanism coresight: etmX.X: stm: Remove unused legacy source trace ID ops coresight: trace-id: Add debug & test macros to trace id allocation drivers/hwtracing/coresight/Makefile | 2 +- drivers/hwtracing/coresight/coresight-core.c | 64 ++--- .../hwtracing/coresight/coresight-etm-perf.c | 16 +- drivers/hwtracing/coresight/coresight-etm.h | 3 +- .../coresight/coresight-etm3x-core.c | 93 ++++--- .../coresight/coresight-etm3x-sysfs.c | 28 +- .../coresight/coresight-etm4x-core.c | 63 ++++- .../coresight/coresight-etm4x-sysfs.c | 32 ++- drivers/hwtracing/coresight/coresight-etm4x.h | 3 + drivers/hwtracing/coresight/coresight-priv.h | 1 + drivers/hwtracing/coresight/coresight-stm.c | 49 +--- .../hwtracing/coresight/coresight-trace-id.c | 255 ++++++++++++++++++ .../hwtracing/coresight/coresight-trace-id.h | 69 +++++ include/linux/coresight-pmu.h | 12 - include/linux/coresight.h | 3 - tools/perf/arch/arm/util/cs-etm.c | 12 +- 16 files changed, 530 insertions(+), 175 deletions(-) create mode 100644 drivers/hwtracing/coresight/coresight-trace-id.c create mode 100644 drivers/hwtracing/coresight/coresight-trace-id.h -- 2.17.1

2 years, 7 months

Re: [PATCH v3] coresight: core: Fix coresight device probe failure issue

by Suzuki K Poulose

Hi Jinlong On 09/03/2022 14:22, Mao Jinlong wrote: > It is possibe that probe failure issue happens when the device > and its child_device's probe happens at the same time. > In coresight_make_links, has_conns_grp is true for parent, but > has_conns_grp is false for child device as has_conns_grp is set > to true in coresight_create_conns_sysfs_group. The probe of parent > device will fail at this condition. Add has_conns_grp check for > child device before make the links and make the process from > device_register to connection_create be atomic to avoid this > probe failure issue. > > Suggested-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > Suggested-by: Mike Leach <mike.leach(a)linaro.org> > Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> Thanks for the rework. The patch looks good to me. Suzuki

2 years, 7 months

[PATCH v2 0/6] coresight: Add config flag to enable branch broadcast

by James Clark

This allows enabling branch broadcast for Perf hosted sessions (the option is currently only available for the sysfs interface). Hopefully this could be useful for testing the decode in perf, for example does a determinisitic run with branch broadcast enabled look the same as with it disabled? It could also be used for scenarios like OpenJ9's support for JIT code: java -Xjit:perfTool hello.java Currently this is not working and you get the usual errors of a missing DSO, but branch broadcast would have to be enabled anyway before working through this next issue: CS ETM Trace: Debug data not found for address 0xffff7b94b058 in /tmp/perf-29360.map Address range support in Perf for branch broadcast has also not been added here, but could be added later. The documentation has been refactored slightly to allow updates to be made that link the Perf format arguments with the existing documentation. For Suzuki's comment, I will do it as a separate change that converts all the other hard coded values to a more consistent sysreg.h style: nit: While at this, please could you change the hard coded value to ETM4_CFG_BIT_RETSTK ? Changes since v1: * Added Leo's reviewed by on patch 3 * Fix bracket styling * Add documentation Applies on top of coresight/next efa56eddf5d5c. But this docs fix is also required to get the links to work: https://marc.info/?l=linux-doc&m=164139331923986&w=2 Also available at: https://gitlab.arm.com/linux-arm/linux-jc/-/tree/james-branch-broadcast-v2 James Clark (6): coresight: Add config flag to enable branch broadcast coresight: Fail to open with return stacks if they are unavailable perf cs-etm: Update deduction of TRCCONFIGR register for branch broadcast Documentation: coresight: Turn numbered subsections into real subsections Documentation: coresight: Link config options to existing documentation Documentation: coresight: Expand branch broadcast documentation .../coresight/coresight-etm4x-reference.rst | 14 ++++- Documentation/trace/coresight/coresight.rst | 56 +++++++++++++++++-- .../hwtracing/coresight/coresight-etm-perf.c | 2 + .../coresight/coresight-etm4x-core.c | 23 ++++++-- include/linux/coresight-pmu.h | 2 + tools/include/linux/coresight-pmu.h | 2 + tools/perf/arch/arm/util/cs-etm.c | 3 + 7 files changed, 92 insertions(+), 10 deletions(-) -- 2.28.0

2 years, 7 months

[PATCH v3 00/15] Make ETM register accesses consistent with sysreg.h

by James Clark

Changes since v2: * Implement Mike's suggestion of not having _SHIFT and using the existing FIELD_GET and FIELD_PREP methods. * Dropped the change to add the new REG_VAL macro because of the above. * FIELD_PREP could be used in some trivial cases, but in some cases the shift is still required but can be calculated with __bf_shf * Improved the commit messages. * The change is still binary equivalent, but requires an extra step mentioned at the end of this cover letter. Applies to coresight/next 3619ee28488 Also available at https://gitlab.arm.com/linux-arm/linux-jc/-/tree/james-cs-register-refactor… To check for binary equivalence follow the same steps in the cover letter of v2, but apply the following change to coresight-priv.h. This is because the existing version of the macros wrap the expression in a new scope {} that flips something in the compiler: #undef FIELD_GET #define FIELD_GET(_mask, _reg) (((_reg) & (_mask)) >> __bf_shf(_mask)) #undef FIELD_PREP #define FIELD_PREP(_mask, _val) (((_val) << __bf_shf(_mask)) & (_mask)) Thanks James James Clark (15): coresight: etm4x: Cleanup TRCIDR0 register accesses coresight: etm4x: Cleanup TRCIDR2 register accesses coresight: etm4x: Cleanup TRCIDR3 register accesses coresight: etm4x: Cleanup TRCIDR4 register accesses coresight: etm4x: Cleanup TRCIDR5 register accesses coresight: etm4x: Cleanup TRCCONFIGR register accesses coresight: etm4x: Cleanup TRCEVENTCTL1R register accesses coresight: etm4x: Cleanup TRCSTALLCTLR register accesses coresight: etm4x: Cleanup TRCVICTLR register accesses coresight: etm3x: Cleanup ETMTECR1 register accesses coresight: etm4x: Cleanup TRCACATRn register accesses coresight: etm4x: Cleanup TRCSSCCRn and TRCSSCSRn register accesses coresight: etm4x: Cleanup TRCSSPCICRn register accesses coresight: etm4x: Cleanup TRCBBCTLR register accesses coresight: etm4x: Cleanup TRCRSCTLRn register accesses .../coresight/coresight-etm3x-core.c | 2 +- .../coresight/coresight-etm3x-sysfs.c | 2 +- .../coresight/coresight-etm4x-core.c | 136 +++++-------- .../coresight/coresight-etm4x-sysfs.c | 180 +++++++++--------- drivers/hwtracing/coresight/coresight-etm4x.h | 122 ++++++++++-- 5 files changed, 244 insertions(+), 198 deletions(-) -- 2.28.0

2 years, 8 months

Re: [PATCH v4 01/10] Use IDR to maintain all the enabled sources' paths.

by Jinlong Mao

Hi Greg, Thanks for your review. On 3/24/2022 8:26 PM, Greg Kroah-Hartman wrote: > On Thu, Mar 24, 2022 at 08:17:25PM +0800, Mao Jinlong wrote: >> Use hash length of the source's device name to map to the pointer >> of the enabled path. Using IDR will be more efficient than using >> the list. And there could be other sources except STM and CPU etms >> in the new HWs. It is better to maintain all the paths together. >> >> Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> >> --- >> drivers/hwtracing/coresight/coresight-core.c | 75 +++++++------------- >> 1 file changed, 26 insertions(+), 49 deletions(-) > Your subject line is odd. Please put back the driver subsystem in the > subject line so that it makes more sense. I will update the subject in next version. > > And how have you measured "more efficient"? Using IDR would be better than doing a sequential search as there will be much more device in future. > > thanks, > > greg k-h Thanks Jinlong Mao

2 years, 8 months

Re: [PATCH v4 01/10] Use IDR to maintain all the enabled sources' paths.

by Jinlong Mao

Hi Greg, On 3/25/2022 1:06 AM, Greg Kroah-Hartman wrote: > On Thu, Mar 24, 2022 at 10:23:19PM +0800, Jinlong Mao wrote: >> Hi Greg, >> >> Thanks for your review. >> >> On 3/24/2022 8:26 PM, Greg Kroah-Hartman wrote: >>> On Thu, Mar 24, 2022 at 08:17:25PM +0800, Mao Jinlong wrote: >>>> Use hash length of the source's device name to map to the pointer >>>> of the enabled path. Using IDR will be more efficient than using >>>> the list. And there could be other sources except STM and CPU etms >>>> in the new HWs. It is better to maintain all the paths together. >>>> >>>> Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> >>>> --- >>>> drivers/hwtracing/coresight/coresight-core.c | 75 +++++++------------- >>>> 1 file changed, 26 insertions(+), 49 deletions(-) >>> Your subject line is odd. Please put back the driver subsystem in the >>> subject line so that it makes more sense. >> I will update the subject in next version. >>> And how have you measured "more efficient"? >> Using IDR would be better than doing a sequential search as there will be >> much more device in future. > How many "more"? Where does the trade off of speed for complexity help? > How much faster is this really? You can't claim performance > improvements without any proof :) There is about 40 trace sources in our internal device. I believe there will be more cpu cores, then there will be more etm sources. IDR here is used to store the path of both etm sources and other sources which aren't associated with CPU. Use IDR is not more complicated than using list. It will also save the time of searching the path when coresight_disable. I tested in internal device. The test case is that enable all the sources, disable the source one by one to check the search time. Use list to store paths: sh-7687 [005] .... 342.113099: __coresight_disable: ====search path start==== source_0 sh-7687 [005] .... 342.113127: __coresight_disable: ====search path end==== source_0 sh-7693 [005] .... 342.542216: __coresight_disable: ====search path start==== source_1 sh-7693 [005] .... 342.542244: __coresight_disable: ====search path end==== source_1 sh-7699 [005] .... 342.929083: __coresight_disable: ====search path start==== source_2 sh-7699 [005] .... 342.929106: __coresight_disable: ====search path end==== source_2 sh-7711 [005] .... 343.760688: __coresight_disable: ====search path start==== source_3 sh-7711 [005] .... 343.760713: __coresight_disable: ====search path end==== source_3 sh-7717 [005] .... 344.172353: __coresight_disable: ====search path start==== source_4 sh-7717 [005] .... 344.172381: __coresight_disable: ====search path end==== source_4 Use IDR to store paths: sh-7156 [006] .... 223.294228: __coresight_disable: ====search path start==== source_0 sh-7156 [006] .... 223.294237: __coresight_disable: ====search path end==== source_0 sh-7162 [006] .... 223.690153: __coresight_disable: ====search path start==== source_1 sh-7162 [006] .... 223.690163: __coresight_disable: ====search path end==== source_1 sh-7168 [006] .... 224.110670: __coresight_disable: ====search path start==== source_2 sh-7168 [006] .... 224.110679: __coresight_disable: ====search path end==== source_2 <...>-7180 [006] .... 224.929315: __coresight_disable: ====search path start==== source_3 <...>-7180 [006] .... 224.929324: __coresight_disable: ====search path end==== source_3 <...>-7186 [006] .... 225.343617: __coresight_disable: ====search path start==== source_4 <...>-7186 [006] .... 225.343626: __coresight_disable: ====search path end==== source_4 From the log, Searching the path from the IDR takes about 9us for each source. Searching the path from the list takes about 23 ~ 28us for the source. Use IDR saves much time. Thanks Jinlong Mao > > thanks, > > greg k-h

2 years, 8 months

CoreSight ELA-600 Embedded Logic Analyzer

by Hugh O'Keeffe

Hi All, Couple of questions: 1. Does anyone know of any other software options other than DS-5 for configuring, capturing and viewing data using the ELA-600 ? 2. I could roll my own but I don't think OpenCSD has support for the ELA-600. Correct ? Thanks in advance Hugh -----Original Message----- From: coresight-request(a)lists.linaro.org <coresight-request(a)lists.linaro.org> Sent: Thursday 24 March 2022 17:36 To: Hugh O'Keeffe <hugh.okeeffe(a)ashling.com> Subject: Welcome to the "CoreSight" mailing list Welcome to the "CoreSight" mailing list! To post to this list, send your message to: coresight(a)lists.linaro.org You can unsubscribe or make adjustments to your options via email by sending a message to: coresight-request(a)lists.linaro.org with the word 'help' in the subject or body (don't include the quotes), and you will get back a message with instructions. You will need your password to change your options, but for security purposes, this password is not included here. If you have forgotten your password you will need to reset it via the web UI.

2 years, 8 months

[PATCH v4] drivers/coresight: Add Ultrasoc System Memory Buffer driver

by Qi Liu

This patch adds driver for Ultrasoc SMB(System Memory Buffer) device. SMB provides a way to buffer messages from ETM, and store these CPU instructions in system memory. SMB is developed by Ultrasoc technology, which is acquired by Siemens, and we still use "Ultrasoc" to name driver. Signed-off-by: Qi Liu <liuqi115(a)huawei.com> Tested-by: JunHao He <hejunhao2(a)hisilicon.com> --- Change since v3: - Modify the file header according to community specifications. - Address the comments from Mathieu. - Link:https://lore.kernel.org/linux-arm-kernel/20211118110016.40398-1-liuqi1… Change since v2: - Move ultrasoc driver to drivers/hwtracing/coresight. - Link:https://lists.linaro.org/pipermail/coresight/2021-November/007310.html Change since v1: - Drop the document of Ultrasoc according to Mathieu's comment. - Add comments to explain some private hardware settings. - Address the comments from Mathieu. - Link: https://lists.linaro.org/pipermail/coresight/2021-August/006842.html Change since RFC: - Move ultrasoc driver to drivers/hwtracing/coresight/ultrasoc. - Remove ultrasoc-axi-com.c, as AXI-COM doesn't need to be configured in basic tracing function. - Remove ultrasoc.c as SMB does not need to register with the ultrasoc core. - Address the comments from Mathieu and Suzuki. - Link: https://lists.linaro.org/pipermail/coresight/2021-June/006535.html drivers/hwtracing/coresight/Kconfig | 10 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/ultrasoc-smb.c | 602 +++++++++++++++++++++ drivers/hwtracing/coresight/ultrasoc-smb.h | 100 ++++ 4 files changed, 713 insertions(+) create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.c create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.h diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 514a9b8086e3..32b87df9994a 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -201,4 +201,14 @@ config CORESIGHT_TRBE To compile this driver as a module, choose M here: the module will be called coresight-trbe. +config ULTRASOC_SMB + tristate "Ultrasoc system memory buffer drivers" + depends on ARM64 && CORESIGHT_LINKS_AND_SINKS + help + This driver provides support for the Ultrasoc system memory buffer (SMB). + SMB is responsible for receiving the trace data from Coresight ETM devices + and storing them to a system buffer. + + To compile this driver as a module, choose M here: the module will be + called ultrasoc-smb. endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index b6c4a48140ec..344dba8d6ff8 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -27,3 +27,4 @@ obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o obj-$(CONFIG_CORESIGHT_TRBE) += coresight-trbe.o coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \ coresight-cti-sysfs.o +obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c new file mode 100644 index 000000000000..a18d061aab61 --- /dev/null +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c @@ -0,0 +1,602 @@ +// SPDX-License-Identifier: MIT/GPL +/* + * Siemens System Memory Buffer driver. + * Copyright(c) 2022, HiSilicon Limited. + */ + +#include <linux/acpi.h> +#include <linux/circ_buf.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> + +#include "ultrasoc-smb.h" + +DEFINE_CORESIGHT_DEVLIST(sink_devs, "smb"); + +static bool smb_buffer_is_empty(struct smb_drv_data *drvdata) +{ + u32 buf_status = readl(drvdata->base + SMB_LB_INT_STS); + + return buf_status & BIT(0) ? false : true; +} + +static bool smb_buffer_cmp_pointer(struct smb_drv_data *drvdata) +{ + u32 wr_offset, rd_offset; + + wr_offset = readl(drvdata->base + SMB_LB_WR_ADDR); + rd_offset = readl(drvdata->base + SMB_LB_RD_ADDR); + return wr_offset == rd_offset; +} + +static void smb_reset_buffer_status(struct smb_drv_data *drvdata) +{ + writel(0xf, drvdata->base + SMB_LB_INT_STS); +} + +/* Purge data remaining in hardware path to SMB. */ +static void smb_purge_data(struct smb_drv_data *drvdata) +{ + writel(0x1, drvdata->base + SMB_LB_PURGE); +} + +static void smb_update_data_size(struct smb_drv_data *drvdata) +{ + struct smb_data_buffer *sdb = &drvdata->sdb; + u32 write_offset; + + smb_purge_data(drvdata); + if (smb_buffer_cmp_pointer(drvdata)) { + if (smb_buffer_is_empty(drvdata)) + sdb->data_size = 0; + else + sdb->data_size = sdb->buf_size; + return; + } + + write_offset = readl(drvdata->base + SMB_LB_WR_ADDR) - sdb->start_addr; + sdb->data_size = CIRC_CNT(write_offset, sdb->rd_offset, sdb->buf_size); +} + +static int smb_open(struct inode *inode, struct file *file) +{ + struct smb_drv_data *drvdata = container_of(file->private_data, + struct smb_drv_data, miscdev); + + if (local_cmpxchg(&drvdata->reading, 0, 1)) + return -EBUSY; + + return 0; +} + +static ssize_t smb_read(struct file *file, char __user *data, size_t len, loff_t *ppos) +{ + struct smb_drv_data *drvdata = container_of(file->private_data, + struct smb_drv_data, miscdev); + struct smb_data_buffer *sdb = &drvdata->sdb; + struct device *dev = &drvdata->csdev->dev; + unsigned long flags; + int to_copy = 0; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (!sdb->data_size) { + smb_update_data_size(drvdata); + if (!sdb->data_size) + goto out; + } + + if (atomic_read(drvdata->csdev->refcnt)) { + to_copy = -EBUSY; + goto out; + } + + to_copy = min(sdb->data_size, len); + + /* Copy parts of trace data when the read pointer will wrap around SMB buffer. */ + if (sdb->rd_offset + to_copy > sdb->buf_size) + to_copy = sdb->buf_size - sdb->rd_offset; + + if (copy_to_user(data, (void *)sdb->buf_base + sdb->rd_offset, to_copy)) { + dev_dbg(dev, "Failed to copy data to user\n"); + to_copy = -EFAULT; + goto out; + } + + *ppos += to_copy; + sdb->data_size -= to_copy; + sdb->rd_offset += to_copy; + sdb->rd_offset %= sdb->buf_size; + writel(sdb->start_addr + sdb->rd_offset, drvdata->base + SMB_LB_RD_ADDR); + dev_dbg(dev, "%d bytes copied\n", to_copy); +out: + if (!sdb->data_size) + smb_reset_buffer_status(drvdata); + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return to_copy; +} + +static int smb_release(struct inode *inode, struct file *file) +{ + struct smb_drv_data *drvdata = container_of(file->private_data, + struct smb_drv_data, miscdev); + local_set(&drvdata->reading, 0); + return 0; +} + +static const struct file_operations smb_fops = { + .owner = THIS_MODULE, + .open = smb_open, + .read = smb_read, + .release = smb_release, + .llseek = no_llseek, +}; + +smb_reg(read_pos, SMB_LB_RD_ADDR); +smb_reg(write_pos, SMB_LB_WR_ADDR); +smb_reg(buf_status, SMB_LB_INT_STS); + +static ssize_t buf_size_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(dev->parent); + + return sysfs_emit(buf, "0x%lx\n", drvdata->sdb.buf_size); +} +static DEVICE_ATTR_RO(buf_size); + +static struct attribute *smb_sink_attrs[] = { + &dev_attr_read_pos.attr, + &dev_attr_write_pos.attr, + &dev_attr_buf_status.attr, + &dev_attr_buf_size.attr, + NULL, +}; + +static const struct attribute_group smb_sink_group = { + .attrs = smb_sink_attrs, + .name = "status", +}; + +static const struct attribute_group *smb_sink_groups[] = { + &smb_sink_group, + NULL, +}; + +static int smb_set_perf_buffer(struct perf_output_handle *handle) +{ + struct cs_buffers *buf = etm_perf_sink_config(handle); + u32 head; + + if (!buf) + return -EINVAL; + + /* Wrap head around to the amount of space we have */ + head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); + + /* Find the page to write to and offset within that page */ + buf->cur = head / PAGE_SIZE; + buf->offset = head % PAGE_SIZE; + + local_set(&buf->data_size, 0); + + return 0; +} + +static void smb_enable_hw(struct smb_drv_data *drvdata) +{ + writel(0x1, drvdata->base + SMB_GLOBAL_EN); +} + +static void smb_disable_hw(struct smb_drv_data *drvdata) +{ + writel(0x0, drvdata->base + SMB_GLOBAL_EN); +} + +static int smb_enable_sysfs(struct smb_drv_data *drvdata) +{ + if (drvdata->mode == CS_MODE_PERF) + return -EBUSY; + + if (drvdata->mode == CS_MODE_SYSFS) + return 0; + + smb_enable_hw(drvdata); + drvdata->mode = CS_MODE_SYSFS; + return 0; +} + +static int smb_enable_perf(struct smb_drv_data *drvdata, void *data) +{ + struct device *dev = &drvdata->csdev->dev; + struct perf_output_handle *handle = data; + pid_t pid; + + if (drvdata->mode == CS_MODE_SYSFS) { + dev_err(dev, "Device is already in used by sysfs\n"); + return -EBUSY; + } + + /* Get a handle on the pid of the target process*/ + pid = task_pid_nr(handle->event->owner); + if (drvdata->pid != -1 && drvdata->pid != pid) { + dev_err(dev, "Device is already in used by other session\n"); + return -EBUSY; + } + /* The sink is already enabled by this session. */ + if (drvdata->pid == pid) + return 0; + + if (smb_set_perf_buffer(handle)) + return -EINVAL; + + smb_enable_hw(drvdata); + drvdata->pid = pid; + drvdata->mode = CS_MODE_PERF; + + return 0; +} + +static int smb_enable(struct coresight_device *csdev, u32 mode, void *data) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + int ret = -EINVAL; + + /* Do nothing if trace data is reading by other interface now. */ + if (local_read(&drvdata->reading)) + return -EBUSY; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (mode == CS_MODE_SYSFS) + ret = smb_enable_sysfs(drvdata); + + if (mode == CS_MODE_PERF) + ret = smb_enable_perf(drvdata, data); + + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + if (ret) + return ret; + + atomic_inc(csdev->refcnt); + dev_dbg(&csdev->dev, "Ultrasoc SMB enabled\n"); + + return 0; +} + +static int smb_disable(struct coresight_device *csdev) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (atomic_dec_return(csdev->refcnt)) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EBUSY; + } + + WARN_ON_ONCE(drvdata->mode == CS_MODE_DISABLED); + smb_disable_hw(drvdata); + + /* + * Data remaining in hardware path will be sent to SMB after purge, so needs to + * synchronize the read pointer to write pointer in perf mode. + */ + smb_purge_data(drvdata); + if (drvdata->mode == CS_MODE_PERF) + writel(readl(drvdata->base + SMB_LB_WR_ADDR), drvdata->base + SMB_LB_RD_ADDR); + + /* Dissociate from the target process. */ + drvdata->pid = -1; + drvdata->mode = CS_MODE_DISABLED; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + dev_dbg(&csdev->dev, "Ultrasoc SMB disabled\n"); + return 0; +} + +static void *smb_alloc_buffer(struct coresight_device *csdev, + struct perf_event *event, void **pages, + int nr_pages, bool overwrite) +{ + struct cs_buffers *buf; + int node; + + node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu); + buf = kzalloc_node(sizeof(*buf), GFP_KERNEL, node); + if (!buf) + return NULL; + + buf->snapshot = overwrite; + buf->nr_pages = nr_pages; + buf->data_pages = pages; + + return buf; +} + +static void smb_free_buffer(void *config) +{ + struct cs_buffers *buf = config; + + kfree(buf); +} + +static void smb_sync_perf_buffer(struct smb_drv_data *drvdata, + struct cs_buffers *buf, unsigned long data_size) +{ + struct smb_data_buffer *sdb = &drvdata->sdb; + char **dst_pages = (char **)buf->data_pages; + unsigned long buf_offset = buf->offset; + unsigned int cur = buf->cur; + unsigned long to_copy; + + while (data_size) { + /* Copy parts of trace data when the read pointer will wrap around SMB buffer. */ + if (sdb->rd_offset + PAGE_SIZE - buf_offset > sdb->buf_size) + to_copy = sdb->buf_size - sdb->rd_offset; + else + to_copy = min(data_size, PAGE_SIZE - buf_offset); + + memcpy_fromio(dst_pages[cur] + buf_offset, sdb->buf_base + sdb->rd_offset, to_copy); + + buf_offset += to_copy; + if (buf_offset >= PAGE_SIZE) { + buf_offset = 0; + cur++; + cur %= buf->nr_pages; + } + data_size -= to_copy; + /* ensure memcpy finished before update the read pointer */ + sdb->rd_offset += to_copy; + sdb->rd_offset %= sdb->buf_size; + } + + sdb->data_size = 0; + writel(sdb->start_addr + sdb->rd_offset, drvdata->base + SMB_LB_RD_ADDR); + smb_reset_buffer_status(drvdata); +} + +static unsigned long smb_update_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + struct smb_data_buffer *sdb = &drvdata->sdb; + struct cs_buffers *buf = sink_config; + unsigned long data_size = 0; + unsigned long flags; + bool lost = false; + + if (!buf) + return 0; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* Don't do anything if another tracer is using this sink. */ + if (atomic_read(csdev->refcnt) != 1) + goto out; + + smb_update_data_size(drvdata); + data_size = sdb->data_size; + if (data_size > handle->size) { + sdb->rd_offset += data_size - handle->size; + sdb->rd_offset %= sdb->buf_size; + data_size = handle->size; + lost = true; + } + + smb_sync_perf_buffer(drvdata, buf, data_size); + if (!buf->snapshot && lost) + perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); + +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return data_size; +} + +static const struct coresight_ops_sink smb_cs_ops = { + .enable = smb_enable, + .disable = smb_disable, + .alloc_buffer = smb_alloc_buffer, + .free_buffer = smb_free_buffer, + .update_buffer = smb_update_buffer, +}; + +static const struct coresight_ops cs_ops = { + .sink_ops = &smb_cs_ops, +}; + +static int smb_init_data_buffer(struct platform_device *pdev, struct smb_data_buffer *sdb) +{ + struct resource *res; + void __iomem *base; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (IS_ERR(res)) { + dev_err(&pdev->dev, "SMB device failed to get resource\n"); + return -EINVAL; + } + + sdb->start_addr = res->start & SMB_BASE_LOW_MASK; + sdb->buf_size = resource_size(res); + if (sdb->buf_size == 0) + return -EINVAL; + + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + sdb->buf_base = base; + + return 0; +} + +static void smb_init_hw(struct smb_drv_data *drvdata) +{ + u32 value; + + /* First disable smb and clear the status of SMB buffer */ + smb_reset_buffer_status(drvdata); + smb_disable_hw(drvdata); + smb_purge_data(drvdata); + + /* Using smb in single-end mode, and set other configures default */ + value = SMB_BUF_CFG_STREAMING | SMB_BUF_SINGLE_END | SMB_BUF_EN; + writel(value, drvdata->base + SMB_LB_CFG_LO); + value = SMB_MSG_FILTER(0x0, 0xff); + writel(value, drvdata->base + SMB_LB_CFG_HI); + + writel(SMB_GLOBAL_CFG, drvdata->base + SMB_CFG_REG); + writel(SMB_GLB_INT_CFG, drvdata->base + SMB_GLOBAL_INT); + writel(SMB_BUF_INT_CFG, drvdata->base + SMB_LB_INT_CTRL); +} + +static int smb_register_sink(struct platform_device *pdev, struct smb_drv_data *drvdata) +{ + struct coresight_platform_data *pdata = NULL; + struct coresight_desc desc = { 0 }; + int ret; + + pdata = coresight_get_platform_data(&pdev->dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + + desc.type = CORESIGHT_DEV_TYPE_SINK; + desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; + desc.ops = &cs_ops; + desc.pdata = pdata; + desc.dev = &pdev->dev; + desc.groups = smb_sink_groups; + desc.name = coresight_alloc_device_name(&sink_devs, &pdev->dev); + if (!desc.name) { + dev_err(&pdev->dev, "Failed to alloc coresight device name"); + return -ENOMEM; + } + + drvdata->csdev = coresight_register(&desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + drvdata->miscdev.name = desc.name; + drvdata->miscdev.minor = MISC_DYNAMIC_MINOR; + drvdata->miscdev.fops = &smb_fops; + ret = misc_register(&drvdata->miscdev); + if (ret) { + coresight_unregister(drvdata->csdev); + dev_err(&pdev->dev, "Failed to register misc: %d\n", ret); + } + + return ret; +} + +static void smb_unregister_sink(struct smb_drv_data *drvdata) +{ + misc_deregister(&drvdata->miscdev); + coresight_unregister(drvdata->csdev); +} + +/* + * Send ultrasoc messge to control hardwares on the tracing path, + * using DSM calls to avoid exposing ultrasoc message format. + */ +static int smb_config_inport(struct device *dev, bool enable) +{ + u32 flag = enable ? 1 : 0; + union acpi_object *obj; + guid_t guid; + + if (guid_parse("82ae1283-7f6a-4cbe-aa06-53e8fb24db18", &guid)) { + dev_err(dev, "Get GUID failed\n"); + return -EINVAL; + } + + obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, 0, flag, NULL); + if (!obj) + dev_err(dev, "ACPI handle failed\n"); + else + ACPI_FREE(obj); + + return 0; +} + +static int smb_probe(struct platform_device *pdev) +{ + struct smb_drv_data *drvdata; + int ret; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(drvdata->base)) { + dev_err(&pdev->dev, "Failed to ioremap resource\n"); + return PTR_ERR(drvdata->base); + } + + ret = smb_init_data_buffer(pdev, &drvdata->sdb); + if (ret) { + dev_err(&pdev->dev, "Failed to init buffer: %d\n", ret); + return ret; + } + + smb_init_hw(drvdata); + spin_lock_init(&drvdata->spinlock); + drvdata->pid = -1; + + ret = smb_register_sink(pdev, drvdata); + if (ret) { + dev_err(&pdev->dev, "Failed to register smb sink\n"); + return ret; + } + + ret = smb_config_inport(&pdev->dev, true); + if (ret) { + smb_unregister_sink(drvdata); + return ret; + } + + platform_set_drvdata(pdev, drvdata); + return 0; +} + +static int smb_remove(struct platform_device *pdev) +{ + struct smb_drv_data *drvdata = platform_get_drvdata(pdev); + int ret; + + ret = smb_config_inport(&pdev->dev, false); + if (ret) + return ret; + + smb_unregister_sink(drvdata); + return 0; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id ultrasoc_smb_acpi_match[] = { + {"HISI03A1", 0}, + {}, +}; +MODULE_DEVICE_TABLE(acpi, ultrasoc_smb_acpi_match); +#endif + +static struct platform_driver smb_driver = { + .driver = { + .name = "ultrasoc-smb", + .acpi_match_table = ACPI_PTR(ultrasoc_smb_acpi_match), + .suppress_bind_attrs = true, + }, + .probe = smb_probe, + .remove = smb_remove, +}; +module_platform_driver(smb_driver); + +MODULE_DESCRIPTION("Ultrasoc smb driver"); +MODULE_LICENSE("Dual MIT/GPL"); +MODULE_AUTHOR("Jonathan Zhou <jonathan.zhouwen(a)huawei.com>"); +MODULE_AUTHOR("Qi Liu <liuqi115(a)huawei.com>"); diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.h b/drivers/hwtracing/coresight/ultrasoc-smb.h new file mode 100644 index 000000000000..a7c76140ee46 --- /dev/null +++ b/drivers/hwtracing/coresight/ultrasoc-smb.h @@ -0,0 +1,100 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Siemens System Memory Buffer driver. + * Copyright(c) 2022, HiSilicon Limited. + */ + +#ifndef _ULTRASOC_SMB_H +#define _ULTRASOC_SMB_H + +#include <linux/coresight.h> +#include <linux/list.h> +#include <linux/miscdevice.h> + +#include "coresight-etm-perf.h" +#include "coresight-priv.h" + +/* Offset of SMB logical buffer registers */ +#define SMB_CFG_REG 0X0 +#define SMB_GLOBAL_EN 0X4 +#define SMB_GLOBAL_INT 0X8 +#define SMB_LB_CFG_LO 0X40 +#define SMB_LB_CFG_HI 0X44 +#define SMB_LB_INT_CTRL 0X48 +#define SMB_LB_INT_STS 0X4C +#define SMB_LB_LIMIT 0X58 +#define SMB_LB_RD_ADDR 0X5C +#define SMB_LB_WR_ADDR 0X60 +#define SMB_LB_PURGE 0X64 + +/* Set SMB_CFG_REG register */ +#define SMB_IDLE_PRD(period) ((((period) - 216) & 0xf) << 12) +#define SMB_MEM_WR(credit, rate) (((credit) << 16) | ((rate) << 18)) +#define SMB_MEM_RD(credit, rate) (((credit) << 22) | ((rate) << 24)) +#define SMB_BURST_LEN(len) (((len) - 1) << 4) +#define SMB_GLOBAL_CFG (SMB_IDLE_PRD(231) | SMB_MEM_WR(0x3, 0x0) | \ + SMB_MEM_RD(0x3, 0x6) | SMB_BURST_LEN(16)) + +/* Set SMB_GLOBAL_INT register */ +#define SMB_INT_EN BIT(0) +#define SMB_INT_TYPE_PULSE BIT(1) +#define SMB_INT_POLARITY_HIGH BIT(2) +#define SMB_GLB_INT_CFG (SMB_INT_EN | SMB_INT_TYPE_PULSE | SMB_INT_POLARITY_HIGH) + +/* Set SMB_LB_CFG_LO register */ +#define SMB_BUF_EN BIT(0) +#define SMB_BUF_SINGLE_END BIT(1) +#define SMB_BUF_INIT BIT(8) +#define SMB_BUF_CONTINUOUS BIT(11) +#define SMB_FLOW_MASK GENMASK(19, 16) +#define SMB_BUF_CFG_STREAMING (SMB_BUF_INIT | SMB_BUF_CONTINUOUS | SMB_FLOW_MASK) +#define SMB_BASE_LOW_MASK GENMASK(31, 0) + +/* Set SMB_LB_CFG_HI register */ +#define SMB_MSG_FILTER(lower, upper) (((lower) & 0xff) | (((upper) & 0xff) << 8)) +#define SMB_BUF_INT_EN BIT(0) +#define SMB_BUF_NOTE_MASK GENMASK(11, 8) +#define SMB_BUF_INT_CFG (SMB_BUF_INT_EN | SMB_BUF_NOTE_MASK) + +/** + * struct smb_data_buffer - Details of the buffer used by SMB + * @buf_base : Memory mapped base address of SMB. + * @start_addr : SMB buffer start Physical address. + * @buf_size : Size of the buffer. + * @data_size : Size of Trace data copy to userspace. + * @rd_offset : Offset of the read pointer in the buffer. + */ +struct smb_data_buffer { + void __iomem *buf_base; + u32 start_addr; + unsigned long buf_size; + unsigned long data_size; + unsigned long rd_offset; +}; + +/** + * struct smb_drv_data - specifics associated to an SMB component + * @base : Memory mapped base address for SMB component. + * @csdev : Component vitals needed by the framework. + * @sdb : Data buffer for SMB. + * @miscdev : Specifics to handle "/dev/smb" entry. + * @spinlock : Only one at a time pls. + * @reading : Synchronise user space access to SMB buffer. + * @pid : Process ID of the process being monitored by the session + * that is using this component. + * @mode : how this SMB is being used, perf mode or sysfs mode. + */ +struct smb_drv_data { + void __iomem *base; + struct coresight_device *csdev; + struct smb_data_buffer sdb; + struct miscdevice miscdev; + spinlock_t spinlock; + local_t reading; + pid_t pid; + u32 mode; +}; + +#define smb_reg(name, offset) coresight_simple_reg32(struct smb_drv_data, name, offset) + +#endif -- 2.24.0

2 years, 9 months

Re: [PATCH v4 05/10] coresight-tpdm: Add integration test support

by Jinlong Mao

Hi Greg, On 3/24/2022 8:28 PM, Greg Kroah-Hartman wrote: > On Thu, Mar 24, 2022 at 08:17:29PM +0800, Mao Jinlong wrote: >> Integration test for tpdm can help to generate the data for >> verification of the topology during TPDM software bring up. >> >> Sample: >> echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink >> echo 1 > /sys/bus/coresight/devices/tpdm1/enable_source >> echo 1 > /sys/bus/coresight/devices/tpdm1/integration_test >> echo 2 > /sys/bus/coresight/devices/tpdm1/integration_test >> cat /dev/tmc_etf0 > /data/etf-tpdm1.bin >> >> Signed-off-by: Tao Zhang <quic_taozha(a)quicinc.com> >> Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> >> --- >> drivers/hwtracing/coresight/Kconfig | 9 ++++ >> drivers/hwtracing/coresight/coresight-tpdm.c | 56 +++++++++++++++++++- >> drivers/hwtracing/coresight/coresight-tpdm.h | 8 +++ >> 3 files changed, 72 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig >> index 5c506a1cd08f..60248fef4089 100644 >> --- a/drivers/hwtracing/coresight/Kconfig >> +++ b/drivers/hwtracing/coresight/Kconfig >> @@ -214,4 +214,13 @@ config CORESIGHT_TPDM >> To compile this driver as a module, choose M here: the module will be >> called coresight-tpdm. >> >> +config CORESIGHT_TPDM_INTEGRATION_TEST >> + bool "Enable CoreSight Integration Test For TPDM" >> + depends on CORESIGHT_TPDM >> + help >> + This option adds support for the CoreSight integration test on this >> + devie. Coresight architecture provides integration control modes of >> + operation to facilitate integration testing and software bringup >> + and/or to instrument topology discovery. The TPDM utilizes integration >> + mode to accomplish integration testing and software bringup. > Why is this a Kconfig option? Why would you never not want this? I refer to "CONFIG_CORESIGHT_CTI_INTEGRATION_REGS" for integration mode. > >> endif >> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c >> index a8d257a591f3..cddd398be0cd 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpdm.c >> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c >> @@ -124,7 +124,60 @@ static void tpdm_init_default_data(struct tpdm_drvdata *drvdata) >> __set_bit(i, drvdata->datasets); >> } >> CS_LOCK(drvdata->base); >> - } >> +} >> + >> +#ifdef CONFIG_CORESIGHT_TPDM_INTEGRATION_TEST > Try to keep #ifdefs out of .c files please. I will check to see if it is possible for the integration test function. >> +static ssize_t integration_test_store(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, >> + size_t size) >> +{ >> + int i, ret = 0; >> + unsigned long val; >> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); >> + >> + ret = kstrtoul(buf, 10, &val); >> + if (ret) >> + return ret; >> + >> + if (val != 1 && val != 2) >> + return -EINVAL; >> + >> + if (!drvdata->enable) >> + return -EINVAL; >> + >> + if (val == 1) >> + val = ATBCNTRL_VAL_64; >> + else >> + val = ATBCNTRL_VAL_32; >> + CS_UNLOCK(drvdata->base); >> + writel_relaxed(0x1, drvdata->base + TPDM_ITCNTRL); >> + >> + for (i = 1; i < 5; i++) >> + writel_relaxed(val, drvdata->base + TPDM_ITATBCNTRL); >> + >> + writel_relaxed(0, drvdata->base + TPDM_ITCNTRL); >> + CS_LOCK(drvdata->base); >> + return size; >> +} >> +static DEVICE_ATTR_WO(integration_test); >> +#endif /* CORESIGHT_TPDM_INTEGRATION_TEST */ >> + >> +static struct attribute *tpdm_attrs[] = { >> +#ifdef CONFIG_CORESIGHT_TPDM_INTEGRATION_TEST >> + &dev_attr_integration_test.attr, >> +#endif /* CORESIGHT_TPDM_INTEGRATION_TEST */ >> + NULL, >> +}; >> + >> +static struct attribute_group tpdm_attr_grp = { >> + .attrs = tpdm_attrs, >> +}; >> + >> +static const struct attribute_group *tpdm_attr_grps[] = { >> + &tpdm_attr_grp, >> + NULL, >> +}; > ATTRIBUTE_GROUPS()? > > thanks, > > greg k-h Thanks Jinlong Mao

2 years, 9 months

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