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Sat, 01 Nov 2025 08:43:59 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Cc: Alexandre Ghiti , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Mark Rutland , Jiri Olsa , Adrian Hunter , Liang Kan , Mayuresh Chitale , Anup Patel , Atish Patra , Andrew Jones , Sunil V L , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mayuresh Chitale , Anup Patel Subject: [PATCH v2 07/12] rvtrace: Add trace ramsink driver Date: Sat, 1 Nov 2025 21:12:40 +0530 Message-ID: <20251101154245.162492-8-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251101154245.162492-1-apatel@ventanamicro.com> References: <20251101154245.162492-1-apatel@ventanamicro.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 Content-Type: text/plain; charset="utf-8" From: Mayuresh Chitale Add initial implementation of RISC-V trace ramsink driver. The ramsink is defined in the RISC-V Trace Control Interface specification. Co-developed-by: Anup Patel Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- drivers/hwtracing/rvtrace/Kconfig | 9 + drivers/hwtracing/rvtrace/Makefile | 1 + drivers/hwtracing/rvtrace/rvtrace-ramsink.c | 262 ++++++++++++++++++++ 3 files changed, 272 insertions(+) create mode 100644 drivers/hwtracing/rvtrace/rvtrace-ramsink.c diff --git a/drivers/hwtracing/rvtrace/Kconfig b/drivers/hwtracing/rvtrace/= Kconfig index ba35c05f3f54..0577f9acb858 100644 --- a/drivers/hwtracing/rvtrace/Kconfig +++ b/drivers/hwtracing/rvtrace/Kconfig @@ -21,3 +21,12 @@ config RVTRACE_ENCODER default y help This driver provides support for RISC-V Trace Encoder component. + +config RVTRACE_RAMSINK + tristate "RISC-V Trace Ramsink driver" + depends on RVTRACE + select DMA_SHARED_BUFFER + default y + help + This driver provides support for Risc-V E-Trace Ramsink + component. diff --git a/drivers/hwtracing/rvtrace/Makefile b/drivers/hwtracing/rvtrace= /Makefile index f320693a1fc5..122e575da9fb 100644 --- a/drivers/hwtracing/rvtrace/Makefile +++ b/drivers/hwtracing/rvtrace/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_RVTRACE) +=3D rvtrace.o rvtrace-y :=3D rvtrace-core.o rvtrace-platform.o obj-$(CONFIG_RVTRACE_ENCODER) +=3D rvtrace-encoder.o +obj-$(CONFIG_RVTRACE_RAMSINK) +=3D rvtrace-ramsink.o diff --git a/drivers/hwtracing/rvtrace/rvtrace-ramsink.c b/drivers/hwtracin= g/rvtrace/rvtrace-ramsink.c new file mode 100644 index 000000000000..676344c9387c --- /dev/null +++ b/drivers/hwtracing/rvtrace/rvtrace-ramsink.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 Ventana Micro Systems Inc. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define RVTRACE_RAMSINK_STARTLOW_OFF 0x010 +#define RVTRACE_RAMSINK_STARTHIGH_OFF 0x014 +#define RVTRACE_RAMSINK_LIMITLOW_OFF 0x018 +#define RVTRACE_RAMSINK_LIMITHIGH_OFF 0x01c +#define RVTRACE_RAMSINK_WPLOW_OFF 0x020 +#define RVTRACE_RAMSINK_WPLOW_WRAP 0x1 +#define RVTRACE_RAMSINK_WPHIGH_OFF 0x024 +#define RVTRACE_RAMSINK_RPLOW_OFF 0x028 +#define RVTRACE_RAMSINK_RPHIGH_OFF 0x02c + +struct rvtrace_ramsink_priv { + size_t size; + void *va; + dma_addr_t start; + dma_addr_t end; + /* WP from prev iteration */ + dma_addr_t prev_head; +}; + +struct trace_buf { + void *base; + size_t size; + long cur; + size_t len; +}; + +static int rvtrace_ramsink_stop(struct rvtrace_component *comp) +{ + return rvtrace_comp_is_empty(comp); +} + +static void tbuf_to_pbuf_copy(struct trace_buf *src, struct trace_buf *dst) +{ + int bytes_dst, bytes_src, bytes; + void *dst_addr, *src_addr; + + while (src->size) { + src_addr =3D src->base + src->cur; + dst_addr =3D dst->base + dst->cur; + + if (dst->len - dst->cur < src->size) + bytes_dst =3D dst->len - dst->cur; + else + bytes_dst =3D src->size; + if (src->len - src->cur < src->size) + bytes_src =3D src->len - src->cur; + else + bytes_src =3D src->size; + bytes =3D bytes_dst < bytes_src ? bytes_dst : bytes_src; + memcpy(dst_addr, src_addr, bytes); + dst->cur =3D (dst->cur + bytes) % dst->len; + src->cur =3D (src->cur + bytes) % src->len; + src->size -=3D bytes; + } +} + +static size_t rvtrace_ramsink_copyto_auxbuf(struct rvtrace_component *comp, + struct rvtrace_perf_auxbuf *buf) +{ + struct rvtrace_ramsink_priv *priv =3D dev_get_drvdata(&comp->dev); + struct trace_buf src, dst; + u32 wp_low, wp_high; + u64 buf_cur_head; + size_t size; + + wp_low =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_WPLOW_OFF); + wp_high =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_WPHIGH_OFF); + buf_cur_head =3D (u64)(wp_high) << 32 | (wp_low & ~RVTRACE_RAMSINK_WPLOW_= WRAP); + + if (buf_cur_head =3D=3D priv->prev_head) + return 0; + + dst.base =3D buf->base; + dst.len =3D buf->length; + dst.cur =3D buf->pos; + + src.base =3D priv->va; + src.len =3D priv->end - priv->start; + if (buf_cur_head > priv->prev_head) { + src.size =3D buf_cur_head - priv->prev_head; + } else { + src.size =3D priv->end - priv->prev_head; + src.size +=3D buf_cur_head - priv->start; + } + + src.cur =3D buf_cur_head - priv->start; + size =3D src.size; + tbuf_to_pbuf_copy(&src, &dst); + buf->pos =3D dst.cur; + priv->prev_head =3D buf_cur_head; + + return size; +} + +static int rvtrace_ramsink_setup_buf(struct rvtrace_component *comp) +{ + struct rvtrace_ramsink_priv *priv =3D dev_get_drvdata(&comp->dev); + u64 start_min, limit_max, end; + u32 low, high; + + /* Probe min and max values for start and limit registers */ + rvtrace_write32(comp->pdata, 0, RVTRACE_RAMSINK_STARTLOW_OFF); + rvtrace_write32(comp->pdata, 0, RVTRACE_RAMSINK_STARTHIGH_OFF); + low =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_STARTLOW_OFF); + high =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_STARTHIGH_OFF); + start_min =3D (u64)(high) << 32 | low; + + rvtrace_write32(comp->pdata, 0xffffffff, RVTRACE_RAMSINK_LIMITLOW_OFF); + rvtrace_write32(comp->pdata, 0xffffffff, RVTRACE_RAMSINK_LIMITHIGH_OFF); + low =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_LIMITLOW_OFF); + high =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_LIMITHIGH_OFF); + limit_max =3D (u64)(high) << 32 | low; + + if (priv->end < start_min) { + dev_err(&comp->dev, "DMA memory not addressable by device\n"); + return -EINVAL; + } + + /* Setup ram sink start addresses */ + if (priv->start < start_min) { + dev_warn(&comp->dev, "Ramsink start address updated from %llx to %llx\n", + priv->start, start_min); + priv->va +=3D start_min - priv->start; + priv->start =3D start_min; + } + + priv->prev_head =3D priv->start; + priv->end =3D priv->start + priv->size; + rvtrace_write32(comp->pdata, lower_32_bits(priv->start), RVTRACE_RAMSINK_= STARTLOW_OFF); + rvtrace_write32(comp->pdata, upper_32_bits(priv->start), RVTRACE_RAMSINK_= STARTHIGH_OFF); + rvtrace_write32(comp->pdata, lower_32_bits(priv->start), RVTRACE_RAMSINK_= WPLOW_OFF); + rvtrace_write32(comp->pdata, upper_32_bits(priv->start), RVTRACE_RAMSINK_= WPHIGH_OFF); + /* Setup ram sink limit addresses */ + if (priv->end > limit_max) { + dev_warn(&comp->dev, "Ramsink limit address updated from %llx to %llx\n"= , priv->end, + limit_max); + priv->end =3D limit_max; + priv->size =3D priv->end - priv->start; + } + + /* Limit address needs to be set to end - 4 to avoid overflow */ + end =3D priv->end - 4; + rvtrace_write32(comp->pdata, lower_32_bits(end), RVTRACE_RAMSINK_LIMITLOW= _OFF); + rvtrace_write32(comp->pdata, upper_32_bits(end), RVTRACE_RAMSINK_LIMITHIG= H_OFF); + low =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_LIMITLOW_OFF); + high =3D rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_LIMITHIGH_OFF); + end =3D (u64)(high) << 32 | low; + if (end !=3D (priv->end - 4)) { + dev_warn(&comp->dev, "Ramsink limit address updated from %llx to %llx\n"= , priv->end, + end); + priv->end =3D end; + priv->size =3D priv->end - priv->start; + } + + return 0; +} + +static int rvtrace_ramsink_setup(struct rvtrace_component *comp) +{ + struct device *pdev =3D comp->pdata->dev; + struct rvtrace_ramsink_priv *priv; + + priv =3D devm_kzalloc(&comp->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + dev_set_drvdata(&comp->dev, priv); + + /* Derive RAM sink memory size based on component implementation ID */ + switch (comp->pdata->impid) { + default: + priv->size =3D SZ_1M; + break; + } + + priv->va =3D dma_alloc_coherent(pdev, priv->size, &priv->start, GFP_KERNE= L); + if (!priv->va) + return -ENOMEM; + + return rvtrace_ramsink_setup_buf(comp); +} + +static void rvtrace_ramsink_cleanup(struct rvtrace_component *comp) +{ + struct rvtrace_ramsink_priv *priv =3D dev_get_drvdata(&comp->dev); + + dma_free_coherent(&comp->dev, priv->size, priv->va, priv->start); +} + +static int rvtrace_ramsink_probe(struct rvtrace_component *comp) +{ + int ret; + + ret =3D rvtrace_ramsink_setup(comp); + if (ret) + return dev_err_probe(&comp->dev, ret, "failed to setup ramsink.\n"); + + ret =3D rvtrace_enable_component(comp); + if (ret) + return dev_err_probe(&comp->dev, ret, "failed to enable ramsink.\n"); + + return ret; +} + +static void rvtrace_ramsink_remove(struct rvtrace_component *comp) +{ + int ret; + + ret =3D rvtrace_disable_component(comp); + if (ret) + dev_err(&comp->dev, "failed to disable ramsink.\n"); + + rvtrace_ramsink_cleanup(comp); +} + +static struct rvtrace_component_id rvtrace_ramsink_ids[] =3D { + { .type =3D RVTRACE_COMPONENT_TYPE_RAMSINK, + .version =3D rvtrace_component_mkversion(1, 0), }, + {}, +}; + +static struct rvtrace_driver rvtrace_ramsink_driver =3D { + .id_table =3D rvtrace_ramsink_ids, + .copyto_auxbuf =3D rvtrace_ramsink_copyto_auxbuf, + .stop =3D rvtrace_ramsink_stop, + .probe =3D rvtrace_ramsink_probe, + .remove =3D rvtrace_ramsink_remove, + .driver =3D { + .name =3D "rvtrace-ramsink", + }, +}; + +static int __init rvtrace_ramsink_init(void) +{ + return rvtrace_register_driver(&rvtrace_ramsink_driver); +} + +static void __exit rvtrace_ramsink_exit(void) +{ + rvtrace_unregister_driver(&rvtrace_ramsink_driver); +} + +module_init(rvtrace_ramsink_init); +module_exit(rvtrace_ramsink_exit); + +/* Module information */ +MODULE_AUTHOR("Mayuresh Chitale "); +MODULE_DESCRIPTION("RISC-V Trace Ramsink Driver"); +MODULE_LICENSE("GPL"); --=20 2.43.0