CoreSight

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2387 discussions

[PATCH v1 RESEND 0/2] perf cs-etm: Improve timestamp tracing

by Leo Yan

This patch series is to improve timestamp handling in per-thread mode. The current code doesn't validate timestamp and always return success for per-thread mode, for a sane implementation, the first patch is to allow validation timestamp tracing in per-thread mode. The second patch is to respect timestamp option "--timestamp" or "-T", when users set this option, the tool will automatically enable hardware timestamp tracing in Arm CoreSight. This patch set is rebased on the latest perf-tools-next branch, and tested on Arm Juno board. And added James Clark's review tags. Leo Yan (2): perf cs-etm: Validate timestamp tracing in per-thread mode perf cs-etm: Respect timestamp option tools/perf/arch/arm/util/cs-etm.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) -- 2.34.1

1 year, 8 months

[PATCH] coresight-tmc-etr: Fix busy error when enable multiple sources

by Mao Jinlong

In enable sink sysfs function, when etr is enabled, it doesn't need to call enable hw function again. [ 91.057233] ------------[ cut here ]------------ [ 91.061983] WARNING: CPU: 6 PID: 145 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1038 tmc_etr_enable_hw+0xc4/0xd0 [ 91.073153] Modules linked in: [ 91.076302] CPU: 6 PID: 145 Comm: sh Tainted: G S W 6.5.0-rc3-g66d5eaa9e5a7 #111 [ 91.085149] Hardware name: Qualcomm Technologies, Inc. SM8450 QRD (DT) [ 91.091847] pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 91.099000] pc : tmc_etr_enable_hw+0xc4/0xd0 [ 91.103389] lr : tmc_enable_etr_sink+0x13c/0x294 [ 91.108130] sp : ffff8000815cbb30 [ 91.111537] x29: ffff8000815cbb30 x28: ffff68ce4352a800 x27: 0000000000000000 [ 91.118868] x26: ffff68ce414cc040 x25: ffff68ce414a82e0 x24: 0000000000000000 [ 91.126199] x23: ffff68ce423a1ee0 x22: ffff68ce423a1e80 x21: ffff68ce4352a800 [ 91.133527] x20: 0000000000000001 x19: ffff68ce414aa500 x18: fffffda31cf9c008 [ 91.140857] x17: 0000000000000040 x16: 0000000000000001 x15: fffffc0000000000 [ 91.148188] x14: 00000000f0000080 x13: 0000000000000000 x12: ffff9739c0000000 [ 91.155516] x11: ffffbe9cdf71e400 x10: 0000000000001000 x9 : ffff68d0b29e3b28 [ 91.162845] x8 : fffffda31cf983c8 x7 : fffffda31cf98388 x6 : 00000000ffffffd0 [ 91.170174] x5 : ffff68ce435d8ec0 x4 : ffff68d0b29e2610 x3 : ffff68ce435d8ec0 [ 91.177502] x2 : ffff68ce414aa500 x1 : ffff68ce414aa500 x0 : ffff68ce423a1e80 [ 91.184833] Call trace: [ 91.187349] tmc_etr_enable_hw+0xc4/0xd0 [ 91.191388] tmc_enable_etr_sink+0x13c/0x294 [ 91.195777] coresight_enable_path+0x21c/0x24c [ 91.200347] coresight_enable+0x9c/0x204 [ 91.204379] enable_source_store+0x58/0xa0 [ 91.208595] dev_attr_store+0x18/0x2c [ 91.212361] sysfs_kf_write+0x40/0x54 [ 91.216126] kernfs_fop_write_iter+0x164/0x1dc [ 91.220692] vfs_write+0x3a8/0x460 [ 91.224191] ksys_write+0x6c/0x100 [ 91.227690] __arm64_sys_write+0x1c/0x28 [ 91.231728] invoke_syscall+0x44/0x100 [ 91.235586] el0_svc_common.constprop.1+0x6c/0xe4 [ 91.240418] do_el0_svc+0x38/0x94 [ 91.243833] el0_svc+0x28/0x74 [ 91.246981] el0t_64_sync_handler+0xa0/0xc4 [ 91.251282] el0t_64_sync+0x174/0x178 [ 91.255045] ---[ end trace 0000000000000000 ]--- sh: write error: Device or resource busy Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 66dc5f97a009..e1c7bae9f6ee 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1204,7 +1204,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev) static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) { - int ret; + int ret = 0; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); struct etr_buf *sysfs_buf = tmc_etr_get_sysfs_buffer(csdev); @@ -1213,12 +1213,16 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) return PTR_ERR(sysfs_buf); spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_SYSFS) + goto out; + ret = tmc_etr_enable_hw(drvdata, sysfs_buf); if (!ret) { drvdata->mode = CS_MODE_SYSFS; atomic_inc(&csdev->refcnt); } +out: spin_unlock_irqrestore(&drvdata->spinlock, flags); if (!ret) -- 2.17.1

1 year, 8 months

[PATCH] coresight: etr: Use noncontiguous api instead of noncoherent

by Mao Jinlong

From: Shilpa Suresh <quic_c_sbsure(a)quicinc.com> The iommu support for noncoherent is removed by commit(dma-mapping: remove the {alloc,free}_noncoherent methods 81d88ce55092edf1a1f928efb373f289c6b90efd). Use alloc_noncontiguous function for etr flat buffer allocation. Signed-off-by: Shilpa Suresh <quic_c_sbsure(a)quicinc.com> Signed-off-by: Mao Jinlong <quic_jinlmao(a)quicinc.com> --- .../hwtracing/coresight/coresight-tmc-etr.c | 47 ++++++++++++++----- 1 file changed, 35 insertions(+), 12 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 66dc5f97a009..80e5aa4a16c9 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -24,6 +24,7 @@ struct etr_flat_buf { dma_addr_t daddr; void *vaddr; size_t size; + struct sg_table *sgt; }; /* @@ -608,14 +609,24 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata, if (!flat_buf) return -ENOMEM; - flat_buf->vaddr = dma_alloc_noncoherent(real_dev, etr_buf->size, - &flat_buf->daddr, - DMA_FROM_DEVICE, GFP_KERNEL); - if (!flat_buf->vaddr) { + flat_buf->sgt = dma_alloc_noncontiguous(real_dev, etr_buf->size, + DMA_FROM_DEVICE, GFP_KERNEL, 0); + if (!flat_buf->sgt) { kfree(flat_buf); return -ENOMEM; } + flat_buf->daddr = sg_dma_address(flat_buf->sgt->sgl); + flat_buf->vaddr = dma_vmap_noncontiguous(real_dev, etr_buf->size, + flat_buf->sgt); + if (!flat_buf->vaddr) { + dma_free_noncontiguous(real_dev, etr_buf->size, + flat_buf->sgt, + DMA_FROM_DEVICE); + flat_buf->sgt = NULL; + return -ENOMEM; + } + flat_buf->size = etr_buf->size; flat_buf->dev = &drvdata->csdev->dev; etr_buf->hwaddr = flat_buf->daddr; @@ -631,9 +642,12 @@ static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf) if (flat_buf && flat_buf->daddr) { struct device *real_dev = flat_buf->dev->parent; - dma_free_noncoherent(real_dev, etr_buf->size, - flat_buf->vaddr, flat_buf->daddr, + dma_vunmap_noncontiguous(real_dev, flat_buf->vaddr); + dma_free_noncontiguous(real_dev, etr_buf->size, + flat_buf->sgt, DMA_FROM_DEVICE); + flat_buf->vaddr = NULL; + flat_buf->sgt = NULL; } kfree(flat_buf); } @@ -642,6 +656,9 @@ static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp) { struct etr_flat_buf *flat_buf = etr_buf->private; struct device *real_dev = flat_buf->dev->parent; + s64 buf_len; + int i; + struct scatterlist *sg; /* * Adjust the buffer to point to the beginning of the trace data @@ -658,13 +675,19 @@ static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp) * the only reason why we would get a wrap around is when the buffer * is full. Sync the entire buffer in one go for this case. */ + if (etr_buf->offset + etr_buf->len > etr_buf->size) - dma_sync_single_for_cpu(real_dev, flat_buf->daddr, - etr_buf->size, DMA_FROM_DEVICE); - else - dma_sync_single_for_cpu(real_dev, - flat_buf->daddr + etr_buf->offset, - etr_buf->len, DMA_FROM_DEVICE); + dma_sync_sgtable_for_cpu(real_dev, flat_buf->sgt, + DMA_FROM_DEVICE); + else { + buf_len = etr_buf->len; + for_each_sg(flat_buf->sgt->sgl, sg, flat_buf->sgt->orig_nents, i) { + dma_sync_sg_for_cpu(real_dev, sg, 1, DMA_FROM_DEVICE); + buf_len -= sg->length; + if (buf_len <= 0) + break; + } + } } static ssize_t tmc_etr_get_data_flat_buf(struct etr_buf *etr_buf, -- 2.17.1

1 year, 8 months

[PATCH 0/3] Fixed some issues and cleanup of ultrasoc-smb

by Junhao He

Fix the two issues listed below and code cleanup a) Fixed the BUG of atomic-sleep b) Fixed uninitialized before use buf_hw_base Junhao He (3): coresight: ultrasoc-smb: fix sleep while close preempt in enable_smb coresight: ultrasoc-smb: simplify the code for check to_copy valid coresight: ultrasoc-smb: fix uninitialized before use buf_hw_base drivers/hwtracing/coresight/ultrasoc-smb.c | 49 +++++++++------------- drivers/hwtracing/coresight/ultrasoc-smb.h | 6 +-- 2 files changed, 23 insertions(+), 32 deletions(-) -- 2.33.0

1 year, 8 months

RE: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

by Linu Cherian

Hi Krzysztof, > -----Original Message----- > From: Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org> > Sent: Tuesday, October 3, 2023 12:02 PM > To: Linu Cherian <lcherian(a)marvell.com>; suzuki.poulose(a)arm.com; > mike.leach(a)linaro.org; james.clark(a)arm.com; leo.yan(a)linaro.org > Cc: linux-arm-kernel(a)lists.infradead.org; coresight(a)lists.linaro.org; linux- > kernel(a)vger.kernel.org; robh+dt(a)kernel.org; > krzysztof.kozlowski+dt(a)linaro.org; conor+dt(a)kernel.org; > devicetree(a)vger.kernel.org; Sunil Kovvuri Goutham > <sgoutham(a)marvell.com>; George Cherian <gcherian(a)marvell.com> > Subject: Re: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add > "memory-region" property > > On 03/10/2023 06:33, Linu Cherian wrote: > > Hi Krzysztof, > > > >> -----Original Message----- > >> From: Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org> > >> Sent: Saturday, September 30, 2023 8:59 PM > >> To: Linu Cherian <lcherian(a)marvell.com>; suzuki.poulose(a)arm.com; > >> mike.leach(a)linaro.org; james.clark(a)arm.com; leo.yan(a)linaro.org > >> Cc: linux-arm-kernel(a)lists.infradead.org; coresight(a)lists.linaro.org; > >> linux- kernel(a)vger.kernel.org; robh+dt(a)kernel.org; > >> krzysztof.kozlowski+dt(a)linaro.org; conor+dt(a)kernel.org; > >> devicetree(a)vger.kernel.org; Sunil Kovvuri Goutham > >> <sgoutham(a)marvell.com>; George Cherian <gcherian(a)marvell.com> > >> Subject: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add > >> "memory-region" property > >> > >> External Email > >> > >> --------------------------------------------------------------------- > >> - On 29/09/2023 15:37, Linu Cherian wrote: > >>> memory-region 0: Reserved trace buffer memory > >>> > >>> TMC ETR: When available, use this reserved memory region for > >>> trace data capture. Same region is used for trace data > >>> retention after a panic or watchdog reset. > >>> > >>> TMC ETF: When available, use this reserved memory region for > >>> trace data retention synced from internal SRAM after a panic or > >>> watchdog reset. > >>> > >>> memory-region 1: Reserved meta data memory > >>> > >>> TMC ETR, ETF: When available, use this memory for register > >>> snapshot retention synced from hardware registers after a panic > >>> or watchdog reset. > >>> > >>> Signed-off-by: Linu Cherian <lcherian(a)marvell.com> > >>> --- > >> > >> Where is the changelog? This is supposed to be v4 or something later. > >> Please, keep proper versioning and changelog. > > > > Sure, will add the changelog from next version onwards. > > > > Yeah, the last version was RFC v3 and the RFC tag has been dropped from > this version onwards. > > Hence started this version with V1. > > v1 says it is the first version, but you already had three others. > Please keep continuous version log, regardless whether you call it RFC or RFT > or RFsomething. Okay. Will continue with Patch V5 from next series and add necessary notes in cover letter. > > > > >> > >>> .../bindings/arm/arm,coresight-tmc.yaml | 19 > +++++++++++++++++++ > >>> 1 file changed, 19 insertions(+) > >>> > > Best regards, > Krzysztof

1 year, 9 months

[PATCH] MAINTAINERS: coresight: Add filename catchall for Coresight

by James Clark

There are a few files missing from the list like test_arm_coresight.sh and arm-coresight.txt. These could be picked up just with a name match. Signed-off-by: James Clark <james.clark(a)arm.com> --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index 90f13281d297..3ee45066b7e4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2066,6 +2066,7 @@ F: tools/perf/arch/arm/util/pmu.c F: tools/perf/tests/shell/coresight/* F: tools/perf/util/cs-etm-decoder/* F: tools/perf/util/cs-etm.* +N: coresight ARM/CORTINA SYSTEMS GEMINI ARM ARCHITECTURE M: Hans Ulli Kroll <ulli.kroll(a)googlemail.com> -- 2.34.1

1 year, 9 months

Re: [PATCH v2] perf cs-etm: Fix incorrect or missing decoder for raw trace

by James Clark

On 04/10/2023 01:32, Besar Wicaksono wrote: > The decoder creation for raw trace uses metadata from the first CPU. > On per-cpu mode, this metadata is incorrectly used for every decoder. > On per-process/per-thread traces, the first CPU is CPU0. If CPU0 trace > is not enabled, its metadata will be marked unused and the decoder is > not created. Perf report dump skips the decoding part because the > decoder is missing. > > To fix this, use metadata of the CPU associated with sample object. > > Signed-off-by: Besar Wicaksono <bwicaksono(a)nvidia.com> > --- > > Changes from v1: > * Update commit message > * Add fallback to CPU-0 metadata if sample CPU id is not available > * Preserve cs_etm__set_trace_param_* arguments and just breakdown the index > parameter into trace-param and metadata indexes > Thanks to Mike and James for the feedback. > v1: https://lore.kernel.org/lkml/20230919224553.1658-1-bwicaksono@nvidia.com/T/… > > --- > tools/perf/util/cs-etm.c | 106 ++++++++++++++++++++++++--------------- > 1 file changed, 65 insertions(+), 41 deletions(-) > There is a trivial conflict on the perf-tools-next repo that it's probably worth rebasing for, otherwise: Reviewed-by: James Clark <james.clark(a)arm.com> Also should probably include linux-perf-users(a)vger.kernel.org as tools changes actually go through the perf tree rather than the coresight one. > diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c > index 1419b40dfbe8..3abe68a9981e 100644 > --- a/tools/perf/util/cs-etm.c > +++ b/tools/perf/util/cs-etm.c > @@ -293,22 +293,31 @@ static int cs_etm__metadata_set_trace_id(u8 trace_chan_id, u64 *cpu_metadata) > }) > > /* > - * Get a metadata for a specific cpu from an array. > + * Get a metadata index for a specific cpu from an array. > * > */ > -static u64 *get_cpu_data(struct cs_etm_auxtrace *etm, int cpu) > +static int get_cpu_data_idx(struct cs_etm_auxtrace *etm, int cpu) > { > int i; > - u64 *metadata = NULL; > > for (i = 0; i < etm->num_cpu; i++) { > if (etm->metadata[i][CS_ETM_CPU] == (u64)cpu) { > - metadata = etm->metadata[i]; > - break; > + return i; > } > } > > - return metadata; > + return -1; > +} > + > +/* > + * Get a metadata for a specific cpu from an array. > + * > + */ > +static u64 *get_cpu_data(struct cs_etm_auxtrace *etm, int cpu) > +{ > + int idx = get_cpu_data_idx(etm, cpu); > + > + return (idx != -1) ? etm->metadata[idx] : NULL; > } > > /* > @@ -651,66 +660,80 @@ static void cs_etm__packet_dump(const char *pkt_string) > } > > static void cs_etm__set_trace_param_etmv3(struct cs_etm_trace_params *t_params, > - struct cs_etm_auxtrace *etm, int idx, > - u32 etmidr) > + struct cs_etm_auxtrace *etm, int t_idx, > + int m_idx, u32 etmidr) > { > u64 **metadata = etm->metadata; > > - t_params[idx].protocol = cs_etm__get_v7_protocol_version(etmidr); > - t_params[idx].etmv3.reg_ctrl = metadata[idx][CS_ETM_ETMCR]; > - t_params[idx].etmv3.reg_trc_id = metadata[idx][CS_ETM_ETMTRACEIDR]; > + t_params[t_idx].protocol = cs_etm__get_v7_protocol_version(etmidr); > + t_params[t_idx].etmv3.reg_ctrl = metadata[m_idx][CS_ETM_ETMCR]; > + t_params[t_idx].etmv3.reg_trc_id = metadata[m_idx][CS_ETM_ETMTRACEIDR]; > } > > static void cs_etm__set_trace_param_etmv4(struct cs_etm_trace_params *t_params, > - struct cs_etm_auxtrace *etm, int idx) > + struct cs_etm_auxtrace *etm, int t_idx, > + int m_idx) > { > u64 **metadata = etm->metadata; > > - t_params[idx].protocol = CS_ETM_PROTO_ETMV4i; > - t_params[idx].etmv4.reg_idr0 = metadata[idx][CS_ETMV4_TRCIDR0]; > - t_params[idx].etmv4.reg_idr1 = metadata[idx][CS_ETMV4_TRCIDR1]; > - t_params[idx].etmv4.reg_idr2 = metadata[idx][CS_ETMV4_TRCIDR2]; > - t_params[idx].etmv4.reg_idr8 = metadata[idx][CS_ETMV4_TRCIDR8]; > - t_params[idx].etmv4.reg_configr = metadata[idx][CS_ETMV4_TRCCONFIGR]; > - t_params[idx].etmv4.reg_traceidr = metadata[idx][CS_ETMV4_TRCTRACEIDR]; > + t_params[t_idx].protocol = CS_ETM_PROTO_ETMV4i; > + t_params[t_idx].etmv4.reg_idr0 = metadata[m_idx][CS_ETMV4_TRCIDR0]; > + t_params[t_idx].etmv4.reg_idr1 = metadata[m_idx][CS_ETMV4_TRCIDR1]; > + t_params[t_idx].etmv4.reg_idr2 = metadata[m_idx][CS_ETMV4_TRCIDR2]; > + t_params[t_idx].etmv4.reg_idr8 = metadata[m_idx][CS_ETMV4_TRCIDR8]; > + t_params[t_idx].etmv4.reg_configr = metadata[m_idx][CS_ETMV4_TRCCONFIGR]; > + t_params[t_idx].etmv4.reg_traceidr = metadata[m_idx][CS_ETMV4_TRCTRACEIDR]; > } > > static void cs_etm__set_trace_param_ete(struct cs_etm_trace_params *t_params, > - struct cs_etm_auxtrace *etm, int idx) > + struct cs_etm_auxtrace *etm, int t_idx, > + int m_idx) > { > u64 **metadata = etm->metadata; > > - t_params[idx].protocol = CS_ETM_PROTO_ETE; > - t_params[idx].ete.reg_idr0 = metadata[idx][CS_ETE_TRCIDR0]; > - t_params[idx].ete.reg_idr1 = metadata[idx][CS_ETE_TRCIDR1]; > - t_params[idx].ete.reg_idr2 = metadata[idx][CS_ETE_TRCIDR2]; > - t_params[idx].ete.reg_idr8 = metadata[idx][CS_ETE_TRCIDR8]; > - t_params[idx].ete.reg_configr = metadata[idx][CS_ETE_TRCCONFIGR]; > - t_params[idx].ete.reg_traceidr = metadata[idx][CS_ETE_TRCTRACEIDR]; > - t_params[idx].ete.reg_devarch = metadata[idx][CS_ETE_TRCDEVARCH]; > + t_params[t_idx].protocol = CS_ETM_PROTO_ETE; > + t_params[t_idx].ete.reg_idr0 = metadata[m_idx][CS_ETE_TRCIDR0]; > + t_params[t_idx].ete.reg_idr1 = metadata[m_idx][CS_ETE_TRCIDR1]; > + t_params[t_idx].ete.reg_idr2 = metadata[m_idx][CS_ETE_TRCIDR2]; > + t_params[t_idx].ete.reg_idr8 = metadata[m_idx][CS_ETE_TRCIDR8]; > + t_params[t_idx].ete.reg_configr = metadata[m_idx][CS_ETE_TRCCONFIGR]; > + t_params[t_idx].ete.reg_traceidr = metadata[m_idx][CS_ETE_TRCTRACEIDR]; > + t_params[t_idx].ete.reg_devarch = metadata[m_idx][CS_ETE_TRCDEVARCH]; > } > > static int cs_etm__init_trace_params(struct cs_etm_trace_params *t_params, > struct cs_etm_auxtrace *etm, > + bool formatted, > + int sample_cpu, > int decoders) > { > - int i; > + int t_idx, m_idx; > u32 etmidr; > u64 architecture; > > - for (i = 0; i < decoders; i++) { > - architecture = etm->metadata[i][CS_ETM_MAGIC]; > + for (t_idx = 0; t_idx < decoders; t_idx++) { > + if (formatted) > + m_idx = t_idx; > + else { > + m_idx = get_cpu_data_idx(etm, sample_cpu); > + if (m_idx == -1) { > + pr_warning("CS_ETM: unknown CPU, falling back to first metadata\n"); > + m_idx = 0; > + } > + } > + > + architecture = etm->metadata[m_idx][CS_ETM_MAGIC]; > > switch (architecture) { > case __perf_cs_etmv3_magic: > - etmidr = etm->metadata[i][CS_ETM_ETMIDR]; > - cs_etm__set_trace_param_etmv3(t_params, etm, i, etmidr); > + etmidr = etm->metadata[m_idx][CS_ETM_ETMIDR]; > + cs_etm__set_trace_param_etmv3(t_params, etm, t_idx, m_idx, etmidr); > break; > case __perf_cs_etmv4_magic: > - cs_etm__set_trace_param_etmv4(t_params, etm, i); > + cs_etm__set_trace_param_etmv4(t_params, etm, t_idx, m_idx); > break; > case __perf_cs_ete_magic: > - cs_etm__set_trace_param_ete(t_params, etm, i); > + cs_etm__set_trace_param_ete(t_params, etm, t_idx, m_idx); > break; > default: > return -EINVAL; > @@ -1026,7 +1049,7 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id, > } > > static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm, > - bool formatted) > + bool formatted, int sample_cpu) > { > struct cs_etm_decoder_params d_params; > struct cs_etm_trace_params *t_params = NULL; > @@ -1051,7 +1074,7 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm, > if (!t_params) > goto out_free; > > - if (cs_etm__init_trace_params(t_params, etm, decoders)) > + if (cs_etm__init_trace_params(t_params, etm, formatted, sample_cpu, decoders)) > goto out_free; > > /* Set decoder parameters to decode trace packets */ > @@ -1091,14 +1114,15 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm, > static int cs_etm__setup_queue(struct cs_etm_auxtrace *etm, > struct auxtrace_queue *queue, > unsigned int queue_nr, > - bool formatted) > + bool formatted, > + int sample_cpu) > { > struct cs_etm_queue *etmq = queue->priv; > > if (list_empty(&queue->head) || etmq) > return 0; > > - etmq = cs_etm__alloc_queue(etm, formatted); > + etmq = cs_etm__alloc_queue(etm, formatted, sample_cpu); > > if (!etmq) > return -ENOMEM; > @@ -2826,7 +2850,7 @@ static int cs_etm__process_auxtrace_event(struct perf_session *session, > * formatted in piped mode (true). > */ > err = cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], > - idx, true); > + idx, true, -1); > if (err) > return err; > > @@ -3032,7 +3056,7 @@ static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_o > idx = auxtrace_event->idx; > formatted = !(aux_event->flags & PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW); > return cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], > - idx, formatted); > + idx, formatted, sample->cpu); > } > > /* Wasn't inside this buffer, but there were no parse errors. 1 == 'not found' */

1 year, 9 months

Re: [PATCH 1/3] perf tests test_arm_coresight: Fix the shellcheck warning in latest test_arm_coresight.sh

by James Clark

On 29/09/2023 05:11, Athira Rajeev wrote: > Running shellcheck on tests/shell/test_arm_coresight.sh > throws below warnings: > > In tests/shell/test_arm_coresight.sh line 15: > cs_etm_path=$(find /sys/bus/event_source/devices/cs_etm/ -name cpu* -print -quit) > ^--^ SC2061: Quote the parameter to -name so the shell won't interpret it. > > In tests/shell/test_arm_coresight.sh line 20: > if [ $archhver -eq 5 -a "$(printf "0x%X\n" $archpart)" = "0xA13" ] ; then > ^-- SC2166: Prefer [ p ] && [ q ] as [ p -a q ] is not well defined > > This warning is observed after commit: > "commit bb350847965d ("perf test: Update cs_etm testcase for Arm ETE")" > > Fixed this issue by using quoting 'cpu*' for SC2061 and > using "&&" in line number 20 for SC2166 warning > > Fixes: bb350847965d ("perf test: Update cs_etm testcase for Arm ETE") > Signed-off-by: Athira Rajeev <atrajeev(a)linux.vnet.ibm.com> > --- > tools/perf/tests/shell/test_arm_coresight.sh | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh > index fe78c4626e45..f2115dfa24a5 100755 > --- a/tools/perf/tests/shell/test_arm_coresight.sh > +++ b/tools/perf/tests/shell/test_arm_coresight.sh > @@ -12,12 +12,12 @@ > glb_err=0 > > cs_etm_dev_name() { > - cs_etm_path=$(find /sys/bus/event_source/devices/cs_etm/ -name cpu* -print -quit) > + cs_etm_path=$(find /sys/bus/event_source/devices/cs_etm/ -name 'cpu*' -print -quit) > trcdevarch=$(cat ${cs_etm_path}/mgmt/trcdevarch) > archhver=$((($trcdevarch >> 12) & 0xf)) > archpart=$(($trcdevarch & 0xfff)) > > - if [ $archhver -eq 5 -a "$(printf "0x%X\n" $archpart)" = "0xA13" ] ; then > + if [ $archhver -eq 5 ] && [ "$(printf "0x%X\n" $archpart)" = "0xA13" ] ; then > echo "ete" > else > echo "etm" Reviewed-by: James Clark <james.clark(a)arm.com>

1 year, 9 months

RE: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add "memory-region" property

by Linu Cherian

Hi Krzysztof, > -----Original Message----- > From: Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org> > Sent: Saturday, September 30, 2023 8:59 PM > To: Linu Cherian <lcherian(a)marvell.com>; suzuki.poulose(a)arm.com; > mike.leach(a)linaro.org; james.clark(a)arm.com; leo.yan(a)linaro.org > Cc: linux-arm-kernel(a)lists.infradead.org; coresight(a)lists.linaro.org; linux- > kernel(a)vger.kernel.org; robh+dt(a)kernel.org; > krzysztof.kozlowski+dt(a)linaro.org; conor+dt(a)kernel.org; > devicetree(a)vger.kernel.org; Sunil Kovvuri Goutham > <sgoutham(a)marvell.com>; George Cherian <gcherian(a)marvell.com> > Subject: [EXT] Re: [PATCH 1/7] dt-bindings: arm: coresight-tmc: Add > "memory-region" property > > External Email > > ---------------------------------------------------------------------- > On 29/09/2023 15:37, Linu Cherian wrote: > > memory-region 0: Reserved trace buffer memory > > > > TMC ETR: When available, use this reserved memory region for > > trace data capture. Same region is used for trace data > > retention after a panic or watchdog reset. > > > > TMC ETF: When available, use this reserved memory region for > > trace data retention synced from internal SRAM after a panic or > > watchdog reset. > > > > memory-region 1: Reserved meta data memory > > > > TMC ETR, ETF: When available, use this memory for register > > snapshot retention synced from hardware registers after a panic > > or watchdog reset. > > > > Signed-off-by: Linu Cherian <lcherian(a)marvell.com> > > --- > > Where is the changelog? This is supposed to be v4 or something later. > Please, keep proper versioning and changelog. Sure, will add the changelog from next version onwards. Yeah, the last version was RFC v3 and the RFC tag has been dropped from this version onwards. Hence started this version with V1. > > > .../bindings/arm/arm,coresight-tmc.yaml | 19 +++++++++++++++++++ > > 1 file changed, 19 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- > tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight- > tmc.yaml > > index cb8dceaca70e..45ca4d02d73e 100644 > > --- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml > > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml > > @@ -101,6 +101,22 @@ properties: > > and ETF configurations. > > $ref: /schemas/graph.yaml#/properties/port > > > > + memory-region: > > + items: > > + - description: Reserved trace buffer memory for ETR and ETF sinks. > > + For ETR, this reserved memory region is used for trace data capture. > > + Same region is used for trace data retention as well after a panic > > + or watchdog reset. > > + For ETF, this reserved memory region is used for retention of trace > > + data synced from internal SRAM after a panic or watchdog reset. > > + > > + - description: Reserved meta data memory. Used for ETR and ETF sinks. > > + > > + memory-region-names: > > + items: > > + - const: trace-mem > > + - const: metadata-mem > > Drop the 'mem' suffixes. > Ack. Will remove it in next version.

1 year, 9 months

[PATCH] coresight: Add mode check when enable/disable csdev source

by Junhao He

The commmit [1] replace "source_ops(csdev)::enable()" with coresight_enable_source(). After this patch, when enable ETM through perf mode, the csdev::enable will be set to true. Then if we to disable the ETM by sysfs mode at the time, the resource will be released incorrectly, kernel will report the following call trace. perf record -e cs_etm/@ultra_smb0/ -C 2 sleep 30 & echo 1 > /sys/bus/coresight/devices/ultra_smb0/enable_sink echo 1 > /sys/bus/coresight/devices/etm0/enable_source echo 0 > /sys/bus/coresight/devices/etm0/enable_source Unable to handle kernel NULL pointer dereference at virtual address 00000000000001d0 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP ... Call trace: etm4_disable+0x54/0x150 [coresight_etm4x] coresight_disable_source+0x6c/0x98 [coresight] coresight_disable+0x74/0x1c0 [coresight] enable_source_store+0x88/0xa0 [coresight] dev_attr_store+0x20/0x40 sysfs_kf_write+0x4c/0x68 kernfs_fop_write_iter+0x120/0x1b8 vfs_write+0x2dc/0x3b0 ksys_write+0x70/0x108 __arm64_sys_write+0x24/0x38 invoke_syscall+0x50/0x128 el0_svc_common.constprop.0+0x104/0x130 do_el0_svc+0x40/0xb8 el0_svc+0x2c/0xb8 el0t_64_sync_handler+0xc0/0xc8 el0t_64_sync+0x1a4/0x1a8 Code: d53cd042 91002000 b9402a81 b8626800 (f940ead5) ---[ end trace 0000000000000000 ]--- The csdev::enable specify the device is currently part of an active path, when enabling source via perf mode, csdev::enable also should be set to true. We can add mode check in etm4_disable() to fix that, if it's done, the sysfs cannot report busy when sysfs to enable ETM that has been enabled by perf. Struct coresight_device add member of mode to check device busy in coresight_(enable/disable)_source function to fixes handle kernel NULL pointer, and sysfs report busy if perf session is already using the ETM. By the way, inperhaps another cleanup patch may be upload to remove the etmv4_drvdata::mode tmc_drvdata::mode or others. Test: perf record -e cs_etm/@ultra_smb0/ -C 2 sleep 30 & cat /sys/bus/coresight/devices/etm2/enable_source 1 echo 1 > /sys/bus/coresight/devices/etm2/enable_source -bash: echo: write error: Device or resource busy echo 0 > /sys/bus/coresight/devices/etm2/enable_source coresight etm2: Someone is already using the tracer cat /sys/bus/coresight/devices/etm2/enable_source 1 [1] "coresight: Enable and disable helper devices adjacent to the path" Fixes: 6148652807ba ("coresight: Enable and disable helper devices adjacent to the path") Signed-off-by: Junhao He <hejunhao3(a)huawei.com> --- drivers/hwtracing/coresight/coresight-core.c | 18 ++++++++++++++++-- .../hwtracing/coresight/coresight-etm-perf.c | 6 +++++- drivers/hwtracing/coresight/coresight-priv.h | 3 ++- include/linux/coresight.h | 14 ++++++++------ 4 files changed, 31 insertions(+), 10 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 206f17826399..7b485fc2ed19 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -388,6 +388,7 @@ int coresight_enable_source(struct coresight_device *csdev, enum cs_mode mode, return ret; } csdev->enable = true; + csdev->mode = mode; } atomic_inc(&csdev->refcnt); @@ -446,18 +447,26 @@ static void coresight_disable_helpers(struct coresight_device *csdev) * the device if there are no users left. * * @csdev: The coresight device to disable + * @mode: How the coresight device is being used, perf mode or sysfs mode. * @data: Opaque data to pass on to the disable function of the source device. * For example in perf mode this is a pointer to the struct perf_event. * * Returns true if the device has been disabled. */ -bool coresight_disable_source(struct coresight_device *csdev, void *data) +bool coresight_disable_source(struct coresight_device *csdev, enum cs_mode mode, + void *data) { + if (csdev->mode && csdev->mode != mode) { + dev_err(&csdev->dev, "Someone is already using the tracer\n"); + return false; + } + if (atomic_dec_return(&csdev->refcnt) == 0) { if (source_ops(csdev)->disable) source_ops(csdev)->disable(csdev, data); coresight_disable_helpers(csdev); csdev->enable = false; + csdev->mode = CS_MODE_DISABLED; } return !csdev->enable; } @@ -1117,6 +1126,11 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto out; + if (csdev->mode == CS_MODE_PERF) { + ret = -EBUSY; + goto out; + } + if (csdev->enable) { /* * There could be multiple applications driving the software @@ -1202,7 +1216,7 @@ void coresight_disable(struct coresight_device *csdev) if (ret) goto out; - if (!csdev->enable || !coresight_disable_source(csdev, NULL)) + if (!csdev->enable || !coresight_disable_source(csdev, CS_MODE_SYSFS, NULL)) goto out; switch (csdev->subtype.source_subtype) { diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index 5ca6278baff4..015aea9f2b22 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -459,6 +459,10 @@ static void etm_event_start(struct perf_event *event, int flags) if (WARN_ON(ctxt->event_data)) goto fail; + /* Sysfs is already using the tracer */ + if (csdev->mode == CS_MODE_SYSFS) + goto fail; + /* * Deal with the ring buffer API and get a handle on the * session's information. @@ -587,7 +591,7 @@ static void etm_event_stop(struct perf_event *event, int mode) return; /* stop tracer */ - coresight_disable_source(csdev, event); + coresight_disable_source(csdev, CS_MODE_PERF, event); /* tell the core */ event->hw.state = PERF_HES_STOPPED; diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 767076e07970..1f8b512ba5ac 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -233,6 +233,7 @@ void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev); struct coresight_device *coresight_get_percpu_sink(int cpu); int coresight_enable_source(struct coresight_device *csdev, enum cs_mode mode, void *data); -bool coresight_disable_source(struct coresight_device *csdev, void *data); +bool coresight_disable_source(struct coresight_device *csdev, enum cs_mode mode, + void *data); #endif diff --git a/include/linux/coresight.h b/include/linux/coresight.h index a269fffaf991..acbbedb9abf3 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -216,6 +216,12 @@ struct coresight_sysfs_link { const char *target_name; }; +enum cs_mode { + CS_MODE_DISABLED, + CS_MODE_SYSFS, + CS_MODE_PERF, +}; + /** * struct coresight_device - representation of a device as used by the framework * @pdata: Platform data with device connections associated to this device. @@ -228,6 +234,7 @@ struct coresight_sysfs_link { * @refcnt: keep track of what is in use. * @orphan: true if the component has connections that haven't been linked. * @enable: 'true' if component is currently part of an active path. + * @mode: This tracer's mode, i.e sysFS, Perf or disabled. * @activated: 'true' only if a _sink_ has been activated. A sink can be * activated but not yet enabled. Enabling for a _sink_ * happens when a source has been selected and a path is enabled @@ -252,6 +259,7 @@ struct coresight_device { atomic_t refcnt; bool orphan; bool enable; /* true only if configured as part of a path */ + enum cs_mode mode; /* sink specific fields */ bool activated; /* true only if a sink is part of a path */ struct dev_ext_attribute *ea; @@ -290,12 +298,6 @@ static struct coresight_dev_list (var) = { \ #define to_coresight_device(d) container_of(d, struct coresight_device, dev) -enum cs_mode { - CS_MODE_DISABLED, - CS_MODE_SYSFS, - CS_MODE_PERF, -}; - #define source_ops(csdev) csdev->ops->source_ops #define sink_ops(csdev) csdev->ops->sink_ops #define link_ops(csdev) csdev->ops->link_ops -- 2.30.0

1 year, 9 months

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