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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id fs21sm5008571pjb.1.2021.11.17.10.09.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Nov 2021 10:09:55 -0800 (PST) Date: Wed, 17 Nov 2021 11:09:52 -0700 From: Mathieu Poirier To: Qi Liu Cc: suzuki.poulose@arm.com, mike.leach@linaro.org, coresight@lists.linaro.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxarm@huawei.com Subject: Re: [PATCH v2] drivers/coresight: ultrasoc: Add System Memory Buffer driver Message-ID: <20211117180952.GA2490670@p14s> References: <20211105012012.86635-1-liuqi115@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211105012012.86635-1-liuqi115@huawei.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 05, 2021 at 09:20:12AM +0800, Qi Liu wrote: > 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 > Tested-by: JunHao He > > --- > > Change since RFC: > - Move ultrasoc driver to drivers/hwtracing/coresight. > - 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 > > 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 > > drivers/hwtracing/coresight/Kconfig | 3 + > drivers/hwtracing/coresight/Makefile | 2 + > drivers/hwtracing/coresight/ultrasoc/Kconfig | 12 + > drivers/hwtracing/coresight/ultrasoc/Makefile | 6 + > .../coresight/ultrasoc/ultrasoc-smb.c | 610 ++++++++++++++++++ > .../coresight/ultrasoc/ultrasoc-smb.h | 116 ++++ > 6 files changed, 749 insertions(+) > create mode 100644 drivers/hwtracing/coresight/ultrasoc/Kconfig > create mode 100644 drivers/hwtracing/coresight/ultrasoc/Makefile > create mode 100644 drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.c > create mode 100644 drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.h The very first thing I asked for during the previous review is to get rid of the "ultrasoc" directory and here it is again. As such I will not continue reviewing this set. > > diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig > index 514a9b8086e3..603430664729 100644 > --- a/drivers/hwtracing/coresight/Kconfig > +++ b/drivers/hwtracing/coresight/Kconfig > @@ -201,4 +201,7 @@ config CORESIGHT_TRBE > > To compile this driver as a module, choose M here: the module will be > called coresight-trbe. > + > +source "drivers/hwtracing/coresight/ultrasoc/Kconfig" > + > endif > diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile > index b6c4a48140ec..50491d57c500 100644 > --- a/drivers/hwtracing/coresight/Makefile > +++ b/drivers/hwtracing/coresight/Makefile > @@ -27,3 +27,5 @@ 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-$(CONFIG_ULTRASOC_SMB) += ultrasoc/ > diff --git a/drivers/hwtracing/coresight/ultrasoc/Kconfig b/drivers/hwtracing/coresight/ultrasoc/Kconfig > new file mode 100644 > index 000000000000..c18c25bf9df3 > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc/Kconfig > @@ -0,0 +1,12 @@ > +# SPDX-License-Identifier: MIT > +# > +# ultrasoc configuration > +# > +config ULTRASOC_SMB > + tristate "Ultrasoc system memory buffer drivers" > + depends on ARM64 && CORESIGHT > + help > + This enables support for the Ultrasoc system memory buffer > + driver that is responsible for receiving the trace data from > + Coresight ETM devices and storing them to a system buffer > + respectively. > diff --git a/drivers/hwtracing/coresight/ultrasoc/Makefile b/drivers/hwtracing/coresight/ultrasoc/Makefile > new file mode 100644 > index 000000000000..8469be50fc6a > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc/Makefile > @@ -0,0 +1,6 @@ > +# SPDX-License-Identifier: GPL-2.0 > +# > +# Makefile for ultrasoc drivers. > +# > + > +obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o > diff --git a/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.c > new file mode 100644 > index 000000000000..f8a4ae705293 > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.c > @@ -0,0 +1,610 @@ > +// SPDX-License-Identifier: MIT > +/* > + * Copyright (C) 2021 HiSilicon Limited. > + * > + * Code herein communicates with and accesses proprietary hardware which is > + * licensed intellectual property (IP) belonging to Siemens Digital Industries > + * Software Ltd. > + * > + * Siemens Digital Industries Software Ltd. asserts and reserves all rights to > + * their intellectual property. This paragraph may not be removed or modified > + * in any way without permission from Siemens Digital Industries Software Ltd. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "ultrasoc-smb.h" > + > +DEFINE_CORESIGHT_DEVLIST(sink_devs, "sink_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_simple_func(struct smb_drv_data, read_pos, SMB_LB_RD_ADDR); > +smb_simple_func(struct smb_drv_data, write_pos, SMB_LB_WR_ADDR); > +smb_simple_func(struct smb_drv_data, 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(struct cs_buffers), 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 without data buffer.\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, ret=%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"); > + > + 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, ret = %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; > +} > + > +static const struct acpi_device_id ultrasoc_smb_acpi_match[] = { > + {"HISI03A1", 0}, > + {}, > +}; > +MODULE_DEVICE_TABLE(acpi, ultrasoc_smb_acpi_match); > + > +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 "); > +MODULE_AUTHOR("Qi Liu "); > diff --git a/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.h b/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.h > new file mode 100644 > index 000000000000..01cb846aeedc > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc/ultrasoc-smb.h > @@ -0,0 +1,116 @@ > +// SPDX-License-Identifier: MIT > +/* > + * Copyright (C) 2021 HiSilicon Limited. > + * > + * Code herein communicates with and accesses proprietary hardware which is > + * licensed intellectual property (IP) belonging to Siemens Digital Industries > + * Software Ltd. > + * > + * Siemens Digital Industries Software Ltd. asserts and reserves all rights to > + * their intellectual property. This paragraph may not be removed or modified > + * in any way without permission from Siemens Digital Industries Software Ltd. > + */ > + > +#ifndef _ULTRASOC_SMB_H > +#define _ULTRASOC_SMB_H > + > +#include > +#include > +#include > + > +#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/xyz.tmc" 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_simple_func(type, name, offset) \ > +static ssize_t name##_show(struct device *_dev, \ > + struct device_attribute *attr, char *buf) \ > +{ \ > + type *drvdata = dev_get_drvdata(_dev->parent); \ > + u32 val = readl(drvdata->base + offset); \ > + \ > + return sysfs_emit(buf, "0x%x\n", val); \ > +} \ > +static DEVICE_ATTR_RO(name) > + > +#endif > -- > 2.33.0 >