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(unknown [10.28.34.196]) by maili.marvell.com (Postfix) with ESMTP id 487235C68F3; Fri, 29 Nov 2024 00:47:43 -0800 (PST) From: Linu Cherian To: , , CC: , , , , , , , , , , , Linu Cherian , Anil Kumar Reddy Subject: [PATCH v12 2/8] coresight: tmc-etr: Add support to use reserved trace memory Date: Fri, 29 Nov 2024 14:17:08 +0530 Message-ID: <20241129084714.3057080-3-lcherian@marvell.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241129084714.3057080-1-lcherian@marvell.com> References: <20241129084714.3057080-1-lcherian@marvell.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: jk_q20OA58FVT4rb9AP3y2-rYyLpHDjR X-Proofpoint-GUID: jk_q20OA58FVT4rb9AP3y2-rYyLpHDjR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.687,Hydra:6.0.235,FMLib:17.0.607.475 definitions=2020-10-13_15,2020-10-13_02,2020-04-07_01 Content-Type: text/plain; charset="utf-8" Add support to use reserved memory for coresight ETR trace buffer. Introduce a new ETR buffer mode called ETR_MODE_RESRV, which becomes available when ETR device tree node is supplied with a valid reserved memory region. ETR_MODE_RESRV can be selected only by explicit user request. $ echo resrv >/sys/bus/coresight/devices/tmc_etr/buf_mode_preferred Signed-off-by: Anil Kumar Reddy Signed-off-by: Linu Cherian Reviewed-by: James Clark --- .../hwtracing/coresight/coresight-tmc-core.c | 50 ++++++++++++ .../hwtracing/coresight/coresight-tmc-etr.c | 79 +++++++++++++++++++ drivers/hwtracing/coresight/coresight-tmc.h | 25 ++++++ 3 files changed, 154 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwt= racing/coresight/coresight-tmc-core.c index 3a482fd2cb22..248989833b20 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-core.c +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -398,6 +399,53 @@ static inline bool tmc_etr_has_non_secure_access(struc= t tmc_drvdata *drvdata) =20 static const struct amba_id tmc_ids[]; =20 +static int of_tmc_get_reserved_resource_by_name(struct device *dev, + const char *name, + struct resource *res) +{ + int index, rc =3D -ENODEV; + struct device_node *node; + + if (!is_of_node(dev->fwnode)) + return -ENODEV; + + index =3D of_property_match_string(dev->of_node, "memory-region-names", + name); + if (index < 0) + return rc; + + node =3D of_parse_phandle(dev->of_node, "memory-region", index); + if (!node) + return rc; + + if (!of_address_to_resource(node, 0, res) && + res->start !=3D 0 && resource_size(res) !=3D 0) + rc =3D 0; + of_node_put(node); + + return rc; +} + +static void tmc_get_reserved_region(struct device *parent) +{ + struct tmc_drvdata *drvdata =3D dev_get_drvdata(parent); + struct resource res; + + if (of_tmc_get_reserved_resource_by_name(parent, "tracedata", &res)) + return; + + drvdata->resrv_buf.vaddr =3D memremap(res.start, + resource_size(&res), + MEMREMAP_WC); + if (IS_ERR_OR_NULL(drvdata->resrv_buf.vaddr)) { + dev_err(parent, "Reserved trace buffer mapping failed\n"); + return; + } + + drvdata->resrv_buf.paddr =3D res.start; + drvdata->resrv_buf.size =3D resource_size(&res); +} + /* Detect and initialise the capabilities of a TMC ETR */ static int tmc_etr_setup_caps(struct device *parent, u32 devid, struct csdev_access *access) @@ -508,6 +556,8 @@ static int __tmc_probe(struct device *dev, struct resou= rce *res) drvdata->size =3D readl_relaxed(drvdata->base + TMC_RSZ) * 4; } =20 + tmc_get_reserved_region(dev); + desc.dev =3D dev; =20 switch (drvdata->config_type) { diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtr= acing/coresight/coresight-tmc-etr.c index a48bb85d0e7f..8bca5b36334a 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -30,6 +30,7 @@ struct etr_buf_hw { bool has_iommu; bool has_etr_sg; bool has_catu; + bool has_resrv; }; =20 /* @@ -695,6 +696,75 @@ static const struct etr_buf_operations etr_flat_buf_op= s =3D { .get_data =3D tmc_etr_get_data_flat_buf, }; =20 +/* + * tmc_etr_alloc_resrv_buf: Allocate a contiguous DMA buffer from reserved= region. + */ +static int tmc_etr_alloc_resrv_buf(struct tmc_drvdata *drvdata, + struct etr_buf *etr_buf, int node, + void **pages) +{ + struct etr_flat_buf *resrv_buf; + struct device *real_dev =3D drvdata->csdev->dev.parent; + + /* We cannot reuse existing pages for resrv buf */ + if (pages) + return -EINVAL; + + resrv_buf =3D kzalloc(sizeof(*resrv_buf), GFP_KERNEL); + if (!resrv_buf) + return -ENOMEM; + + resrv_buf->daddr =3D dma_map_resource(real_dev, drvdata->resrv_buf.paddr, + drvdata->resrv_buf.size, + DMA_FROM_DEVICE, 0); + if (dma_mapping_error(real_dev, resrv_buf->daddr)) { + dev_err(real_dev, "failed to map source buffer address\n"); + kfree(resrv_buf); + return -ENOMEM; + } + + resrv_buf->vaddr =3D drvdata->resrv_buf.vaddr; + resrv_buf->size =3D etr_buf->size =3D drvdata->resrv_buf.size; + resrv_buf->dev =3D &drvdata->csdev->dev; + etr_buf->hwaddr =3D resrv_buf->daddr; + etr_buf->mode =3D ETR_MODE_RESRV; + etr_buf->private =3D resrv_buf; + return 0; +} + +static void tmc_etr_free_resrv_buf(struct etr_buf *etr_buf) +{ + struct etr_flat_buf *resrv_buf =3D etr_buf->private; + + if (resrv_buf && resrv_buf->daddr) { + struct device *real_dev =3D resrv_buf->dev->parent; + + dma_unmap_resource(real_dev, resrv_buf->daddr, + resrv_buf->size, DMA_FROM_DEVICE, 0); + } + kfree(resrv_buf); +} + +static void tmc_etr_sync_resrv_buf(struct etr_buf *etr_buf, u64 rrp, u64 r= wp) +{ + /* + * Adjust the buffer to point to the beginning of the trace data + * and update the available trace data. + */ + etr_buf->offset =3D rrp - etr_buf->hwaddr; + if (etr_buf->full) + etr_buf->len =3D etr_buf->size; + else + etr_buf->len =3D rwp - rrp; +} + +static const struct etr_buf_operations etr_resrv_buf_ops =3D { + .alloc =3D tmc_etr_alloc_resrv_buf, + .free =3D tmc_etr_free_resrv_buf, + .sync =3D tmc_etr_sync_resrv_buf, + .get_data =3D tmc_etr_get_data_flat_buf, +}; + /* * tmc_etr_alloc_sg_buf: Allocate an SG buf @etr_buf. Setup the parameters * appropriately. @@ -801,6 +871,7 @@ static const struct etr_buf_operations *etr_buf_ops[] = =3D { [ETR_MODE_FLAT] =3D &etr_flat_buf_ops, [ETR_MODE_ETR_SG] =3D &etr_sg_buf_ops, [ETR_MODE_CATU] =3D NULL, + [ETR_MODE_RESRV] =3D &etr_resrv_buf_ops }; =20 void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu) @@ -826,6 +897,7 @@ static inline int tmc_etr_mode_alloc_buf(int mode, case ETR_MODE_FLAT: case ETR_MODE_ETR_SG: case ETR_MODE_CATU: + case ETR_MODE_RESRV: if (etr_buf_ops[mode] && etr_buf_ops[mode]->alloc) rc =3D etr_buf_ops[mode]->alloc(drvdata, etr_buf, node, pages); @@ -844,6 +916,7 @@ static void get_etr_buf_hw(struct device *dev, struct e= tr_buf_hw *buf_hw) buf_hw->has_iommu =3D iommu_get_domain_for_dev(dev->parent); buf_hw->has_etr_sg =3D tmc_etr_has_cap(drvdata, TMC_ETR_SG); buf_hw->has_catu =3D !!tmc_etr_get_catu_device(drvdata); + buf_hw->has_resrv =3D tmc_has_reserved_buffer(drvdata); } =20 static bool etr_can_use_flat_mode(struct etr_buf_hw *buf_hw, ssize_t etr_b= uf_size) @@ -1831,6 +1904,7 @@ static const char *const buf_modes_str[] =3D { [ETR_MODE_FLAT] =3D "flat", [ETR_MODE_ETR_SG] =3D "tmc-sg", [ETR_MODE_CATU] =3D "catu", + [ETR_MODE_RESRV] =3D "resrv", [ETR_MODE_AUTO] =3D "auto", }; =20 @@ -1849,6 +1923,9 @@ static ssize_t buf_modes_available_show(struct device= *dev, if (buf_hw.has_catu) size +=3D sysfs_emit_at(buf, size, "%s ", buf_modes_str[ETR_MODE_CATU]); =20 + if (buf_hw.has_resrv) + size +=3D sysfs_emit_at(buf, size, "%s ", buf_modes_str[ETR_MODE_RESRV]); + size +=3D sysfs_emit_at(buf, size, "\n"); return size; } @@ -1876,6 +1953,8 @@ static ssize_t buf_mode_preferred_store(struct device= *dev, drvdata->etr_mode =3D ETR_MODE_ETR_SG; else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_CATU]) && buf_hw.has_cat= u) drvdata->etr_mode =3D ETR_MODE_CATU; + else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_RESRV]) && buf_hw.has_re= srv) + drvdata->etr_mode =3D ETR_MODE_RESRV; else if (sysfs_streq(buf, buf_modes_str[ETR_MODE_AUTO])) drvdata->etr_mode =3D ETR_MODE_AUTO; else diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracin= g/coresight/coresight-tmc.h index 2671926be62a..d2261eddab71 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -135,6 +135,7 @@ enum etr_mode { ETR_MODE_FLAT, /* Uses contiguous flat buffer */ ETR_MODE_ETR_SG, /* Uses in-built TMC ETR SG mechanism */ ETR_MODE_CATU, /* Use SG mechanism in CATU */ + ETR_MODE_RESRV, /* Use reserved region contiguous buffer */ ETR_MODE_AUTO, /* Use the default mechanism */ }; =20 @@ -164,6 +165,17 @@ struct etr_buf { void *private; }; =20 +/** + * @paddr : Start address of reserved memory region. + * @vaddr : Corresponding CPU virtual address. + * @size : Size of reserved memory region. + */ +struct tmc_resrv_buf { + phys_addr_t paddr; + void *vaddr; + size_t size; +}; + /** * struct tmc_drvdata - specifics associated to an TMC component * @pclk: APB clock if present, otherwise NULL @@ -189,6 +201,10 @@ struct etr_buf { * @idr_mutex: Access serialisation for idr. * @sysfs_buf: SYSFS buffer for ETR. * @perf_buf: PERF buffer for ETR. + * @resrv_buf: Used by ETR as hardware trace buffer and for trace data + * retention (after crash) only when ETR_MODE_RESRV buffer + * mode is enabled. Used by ETF for trace data retention + * (after crash) by default. */ struct tmc_drvdata { struct clk *pclk; @@ -214,6 +230,7 @@ struct tmc_drvdata { struct mutex idr_mutex; struct etr_buf *sysfs_buf; struct etr_buf *perf_buf; + struct tmc_resrv_buf resrv_buf; }; =20 struct etr_buf_operations { @@ -331,6 +348,14 @@ tmc_sg_table_buf_size(struct tmc_sg_table *sg_table) return (unsigned long)sg_table->data_pages.nr_pages << PAGE_SHIFT; } =20 +static inline bool tmc_has_reserved_buffer(struct tmc_drvdata *drvdata) +{ + if (drvdata->resrv_buf.vaddr && + drvdata->resrv_buf.size) + return true; + return false; +} + struct coresight_device *tmc_etr_get_catu_device(struct tmc_drvdata *drvda= ta); =20 void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu); --=20 2.34.1