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Wed, 01 Oct 2025 23:09:09 -0700 (PDT) Received: from localhost.localdomain ([122.171.19.158]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b6099f594afsm1205029a12.37.2025.10.01.23.09.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Oct 2025 23:09:09 -0700 (PDT) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Greg KH , Alexander Shishkin , Ian Rogers Subject: [PATCH 07/11] rvtrace: Add trace ramsink driver Date: Thu, 2 Oct 2025 11:37:28 +0530 Message-ID: <20251002060732.100213-8-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251002060732.100213-1-apatel@ventanamicro.com> References: <20251002060732.100213-1-apatel@ventanamicro.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251001_230910_826326_0FFF074E X-CRM114-Status: GOOD ( 21.46 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Alexandre Ghiti , Atish Patra , Peter Zijlstra , Anup Patel , Adrian Hunter , linux-kernel@vger.kernel.org, Mayuresh Chitale , Ingo Molnar , Jiri Olsa , Anup Patel , Mayuresh Chitale , Namhyung Kim , linux-riscv@lists.infradead.org, Andrew Jones , Liang Kan Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 | 8 + drivers/hwtracing/rvtrace/Makefile | 1 + drivers/hwtracing/rvtrace/rvtrace-ramsink.c | 198 ++++++++++++++++++++ 3 files changed, 207 insertions(+) create mode 100644 drivers/hwtracing/rvtrace/rvtrace-ramsink.c diff --git a/drivers/hwtracing/rvtrace/Kconfig b/drivers/hwtracing/rvtrace/Kconfig index ba35c05f3f54..aef7e9989165 100644 --- a/drivers/hwtracing/rvtrace/Kconfig +++ b/drivers/hwtracing/rvtrace/Kconfig @@ -21,3 +21,11 @@ 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 + 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-$(CONFIG_RVTRACE) += rvtrace.o rvtrace-y := rvtrace-core.o rvtrace-platform.o obj-$(CONFIG_RVTRACE_ENCODER) += rvtrace-encoder.o +obj-$(CONFIG_RVTRACE_RAMSINK) += rvtrace-ramsink.o diff --git a/drivers/hwtracing/rvtrace/rvtrace-ramsink.c b/drivers/hwtracing/rvtrace/rvtrace-ramsink.c new file mode 100644 index 000000000000..7bd0cf1e4dfd --- /dev/null +++ b/drivers/hwtracing/rvtrace/rvtrace-ramsink.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 Ventana Micro Systems Inc. + */ + +#include +#include +#include +#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_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; + int cur, len; +}; + +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 = src->base + src->cur; + dst_addr = dst->base + dst->cur; + + if (dst->len - dst->cur < src->size) + bytes_dst = dst->len - dst->cur; + else + bytes_dst = src->size; + if (src->len - src->cur < src->size) + bytes_src = src->len - src->cur; + else + bytes_src = src->size; + bytes = bytes_dst < bytes_src ? bytes_dst : bytes_src; + memcpy(dst_addr, src_addr, bytes); + dst->cur = (dst->cur + bytes) % dst->len; + src->cur = (src->cur + bytes) % src->len; + src->size -= bytes; + } +} + +static size_t rvtrace_ramsink_copyto_auxbuf(struct rvtrace_component *comp, + struct rvtrace_perf_auxbuf *buf) +{ + struct rvtrace_ramsink_priv *priv = dev_get_drvdata(&comp->dev); + struct trace_buf src, dst; + u32 wp_low, wp_high; + u64 buf_cur_head; + size_t size; + + wp_low = rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_WPLOW_OFF); + wp_high = rvtrace_read32(comp->pdata, RVTRACE_RAMSINK_WPHIGH_OFF); + buf_cur_head = (u64)(wp_high) << 32 | wp_low; + + if (buf_cur_head == priv->prev_head) + return 0; + + dst.base = buf->base; + dst.len = buf->length; + dst.cur = buf->pos; + dst.size = 0; + + src.base = priv->va; + src.len = priv->end - priv->start; + if (buf_cur_head > priv->prev_head) { + src.size = buf_cur_head - priv->prev_head; + } else { + src.size = priv->end - priv->prev_head; + src.size += buf_cur_head - priv->start; + } + + src.cur = buf_cur_head - priv->start; + size = src.size; + tbuf_to_pbuf_copy(&src, &dst); + buf->pos = dst.cur; + priv->prev_head = buf_cur_head; + + return size; +} + +static int rvtrace_ramsink_setup(struct rvtrace_component *comp) +{ + struct rvtrace_ramsink_priv *priv; + + priv = devm_kzalloc(&comp->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + dev_set_drvdata(&comp->dev, priv); + + priv->size = SZ_4M; + priv->va = dma_alloc_coherent(&comp->dev, priv->size, &priv->start, GFP_KERNEL); + if (!priv->va) + return -ENOMEM; + priv->end = priv->start + priv->size; + priv->prev_head = priv->start; + + /* Setup ram sink addresses */ + 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); + /* Limit address needs to be set to end - 4 so that HW doesn't cause an overflow. */ + rvtrace_write32(comp->pdata, lower_32_bits(priv->end - 0x4), RVTRACE_RAMSINK_LIMITLOW_OFF); + rvtrace_write32(comp->pdata, upper_32_bits(priv->end), RVTRACE_RAMSINK_LIMITHIGH_OFF); + + return 0; +} + +static void rvtrace_ramsink_cleanup(struct rvtrace_component *comp) +{ + struct rvtrace_ramsink_priv *priv = 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 = rvtrace_ramsink_setup(comp); + if (ret) + return dev_err_probe(&comp->dev, ret, "failed to setup ramsink.\n"); + + ret = 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 = 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[] = { + { .type = RVTRACE_COMPONENT_TYPE_RAMSINK, + .version = rvtrace_component_mkversion(1, 0), }, + {}, +}; + +static struct rvtrace_driver rvtrace_ramsink_driver = { + .id_table = rvtrace_ramsink_ids, + .copyto_auxbuf = rvtrace_ramsink_copyto_auxbuf, + .probe = rvtrace_ramsink_probe, + .remove = rvtrace_ramsink_remove, + .driver = { + .name = "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"); -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv