| Message ID | 20220606130223.57354-2-liuqi115@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for UltraSoc System Memory Buffer | expand |
Hi Qi On 06/06/2022 14:02, 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. nit: "CPU instruction trace" 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 <liuqi115@huawei.com> > Tested-by: JunHao He <hejunhao2@hisilicon.com> > --- > drivers/hwtracing/coresight/Kconfig | 10 + > drivers/hwtracing/coresight/Makefile | 1 + > drivers/hwtracing/coresight/ultrasoc-smb.c | 663 +++++++++++++++++++++ > drivers/hwtracing/coresight/ultrasoc-smb.h | 110 ++++ > 4 files changed, 784 insertions(+) > create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.c > create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.h > > diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig > index 514a9b8086e3..4380eb1a0a73 100644 > --- a/drivers/hwtracing/coresight/Kconfig > +++ b/drivers/hwtracing/coresight/Kconfig ... > diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile > index b6c4a48140ec..344dba8d6ff8 100644 > --- a/drivers/hwtracing/coresight/Makefile > +++ b/drivers/hwtracing/coresight/Makefile > @@ -27,3 +27,4 @@ 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-smb.o > diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c > new file mode 100644 > index 000000000000..44b4bceb6f28 > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c ... > +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); > + unsigned long flags; > + int ret = 0; > + > + spin_lock_irqsave(&drvdata->spinlock, flags); > + > + if (local_read(&drvdata->reading)) { > + ret = -EBUSY; > + goto out; > + } > + > + if (drvdata->mode == CS_MODE_PERF) { > + ret = -EINVAL; > + goto out; > + } > + > +out: > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return ret; > +} > + > +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 (atomic_read(drvdata->csdev->refcnt)) { > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return -EBUSY; > + } > + > + if (local_cmpxchg(&drvdata->reading, 0, 1)) { > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return -EBUSY; > + } > + Shouldn't this be done in smb_open() ? Otherwise, a subsequent read will fail with EBUSY ? i.e, fd = open(/dev/ultra_smb0, ..); # size of the SMB buffer = 1M, size = read(fd, buf, SZ_4K); /* Do something the buf */ if (size >= 0) size = read(fd, buf, SZ_4K); ^^ This would fail, isn't it ? > + if (!sdb->data_size) { > + smb_update_data_size(drvdata); > + if (!sdb->data_size) > + goto out; > + } > + > + to_copy = min(sdb->data_size, len); > + > + /* Copy parts of trace data when read pointer 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_reg(read_pos, SMB_LB_RD_ADDR); > +smb_reg(write_pos, SMB_LB_WR_ADDR); > +smb_reg(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 = "mgmt", > +}; > + > +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; > + I believe these fields should be dropped and instead use the handle->head, to determine the page number and offset. See the TMC-ETR driver for e.g. > + 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 coresight_device *csdev) > +{ > + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); > + unsigned long flags; > + int ret = 0; > + > + spin_lock_irqsave(&drvdata->spinlock, flags); > + if (drvdata->mode == CS_MODE_PERF) { > + ret = -EBUSY; > + goto out; > + } > + > + if (drvdata->mode == CS_MODE_DISABLED) { > + smb_enable_hw(drvdata); > + drvdata->mode = CS_MODE_SYSFS; > + } > + > + atomic_inc(csdev->refcnt); > +out: > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return ret; > +} > + > +static int smb_enable_perf(struct coresight_device *csdev, void *data) > +{ > + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); > + struct device *dev = &drvdata->csdev->dev; > + struct perf_output_handle *handle = data; > + struct cs_buffers *buf = etm_perf_sink_config(handle); > + unsigned long flags; > + int ret = 0; > + pid_t pid; > + > + spin_lock_irqsave(&drvdata->spinlock, flags); > + if (drvdata->mode == CS_MODE_SYSFS) { > + dev_dbg(dev, "Device is already in used by sysfs.\n"); > + ret = -EBUSY; > + goto out; > + } > + > + /* Get a handle on the pid of the target process */ > + pid = buf->pid; > + if (drvdata->pid != -1 && drvdata->pid != pid) { > + dev_dbg(dev, "Device is already in used by other session.\n"); > + ret = -EBUSY; > + goto out; > + } > + > + /* The sink is already enabled by this session */ > + if (drvdata->pid == pid) { > + atomic_inc(csdev->refcnt); > + goto out; > + } > + > + ret = smb_set_perf_buffer(handle); > + if (ret) > + goto out; > + > + smb_enable_hw(drvdata); > + drvdata->pid = pid; > + drvdata->mode = CS_MODE_PERF; > + atomic_inc(csdev->refcnt); > +out: > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return ret; > +} > + > +static int smb_enable(struct coresight_device *csdev, u32 mode, void *data) > +{ > + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); > + int ret; > + > + /* Do nothing if trace data is reading by other interface now */ > + if (local_read(&drvdata->reading)) > + return -EBUSY; > + Is there global switch for all the inports ? Or is there a control for individual inports to the SMB ? Do we need additional information here to enable the corresponding port ? > + switch (mode) { > + case CS_MODE_SYSFS: > + ret = smb_enable_sysfs(csdev); > + break; > + case CS_MODE_PERF: > + ret = smb_enable_perf(csdev, data); > + break; > + default: > + ret = -EINVAL; > + break; > + } > + > + if (ret) > + return ret; > + 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 (local_read(&drvdata->reading)) { > + spin_unlock_irqrestore(&drvdata->spinlock, flags); > + return -EBUSY; > + } > + > + 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); > + smb_purge_data(drvdata); > + > + /* 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; > + buf->pid = task_pid_nr(event->owner); > + > + 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) You may need to pass the aux_handle here, to determine the handle->head and the size. See my comments above. > +{ > + struct smb_data_buffer *sdb = &drvdata->sdb; > + char **dst_pages = (char **)buf->data_pages; > + unsigned long page_offset = buf->offset; > + unsigned int cur = buf->cur; > + unsigned long to_copy; > + > + while (data_size) { > + unsigned long page_space = PAGE_SIZE - page_offset; > + > + /* Copy parts of trace data when read pointer wrap around */ > + if (sdb->rd_offset + page_space > sdb->buf_size) > + to_copy = sdb->buf_size - sdb->rd_offset; > + else > + to_copy = min(data_size, page_space); > + > + memcpy_fromio(dst_pages[cur] + page_offset, > + sdb->buf_base + sdb->rd_offset, to_copy); > + > + page_offset += to_copy; > + if (page_offset >= PAGE_SIZE) { > + page_offset = 0; > + cur++; > + cur %= buf->nr_pages; > + } > + data_size -= to_copy; > + 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); > + > + /* > + * Data remained in link cannot be purged when SMB is full, so > + * synchronize the read pointer to write pointer, to make sure > + * these remained data won't influence next trace. > + */ > + if (sdb->full) { > + smb_purge_data(drvdata); > + writel(readl(drvdata->base + SMB_LB_WR_ADDR), > + 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_disable_hw(drvdata); > + smb_update_data_size(drvdata); > + data_size = sdb->data_size; > + > + /* > + * The SMB buffer may be bigger than the space available in the > + * perf ring buffer (handle->size). If so advance the offset so > + * that we get the latest trace data. > + */ > + 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); > + > + smb_enable_hw(drvdata); > +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 failed to get resource.\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) > +{ > + /* First disable smb and clear the status of SMB buffer */ > + smb_reset_buffer_status(drvdata); > + smb_disable_hw(drvdata); > + smb_purge_data(drvdata); > + > + writel(SMB_BUF_CFG_STREAMING, drvdata->base + SMB_LB_CFG_LO); > + writel(SMB_MSG_FILTER, 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); Please fill in the csdev_access method for the device. desc.access = CSDEV_ACCESS_IOMEM(drvdata->base); > + 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); > +} > + > +static int smb_config_inport(struct device *dev, bool enable) > +{ > + u64 func = enable ? 1 : 0; > + union acpi_object *obj; > + guid_t guid; > + u64 rev = 0; > + > + /* > + * Using DSM calls to enable/disable ultrasoc hardwares on > + * tracing path, to prevent ultrasoc packet format being exposed. > + */ > + if (guid_parse(ULTRASOC_SMB_DSM_UUID, &guid)) { > + dev_err(dev, "Get GUID failed.\n"); > + return -EINVAL; > + } > + > + obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, rev, func, NULL); > + if (!obj) > + dev_err(dev, "ACPI handle failed!\n"); > + else > + 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"); "UltraSoc SMB CoreSight driver" > +MODULE_LICENSE("Dual MIT/GPL"); > +MODULE_AUTHOR("Jonathan Zhou <jonathan.zhouwen@huawei.com>"); > +MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>"); > diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.h b/drivers/hwtracing/coresight/ultrasoc-smb.h > new file mode 100644 > index 000000000000..a01f869fe122 > --- /dev/null > +++ b/drivers/hwtracing/coresight/ultrasoc-smb.h > @@ -0,0 +1,110 @@ > +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ > +/* > + * Siemens System Memory Buffer driver. > + * Copyright(c) 2021, HiSilicon Limited. > + */ > + > +#ifndef _ULTRASOC_SMB_H > +#define _ULTRASOC_SMB_H > + > +#include <linux/coresight.h> > +#include <linux/list.h> > +#include <linux/miscdevice.h> > + > +#include "coresight-etm-perf.h" > +#include "coresight-priv.h" > + > +/* Offset of SMB logical buffer registers */ > +#define SMB_CFG_REG 0x00 > +#define SMB_GLOBAL_EN 0x04 > +#define SMB_GLOBAL_INT 0x08 > +#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_BURST_LEN GENMASK(7, 4) > +#define SMB_IDLE_PRD GENMASK(15, 12) > +#define SMB_MEM_WR GENMASK(17, 16) > +#define SMB_MEM_RD (GENMASK(26, 25) | GENMASK(23, 22)) > +#define SMB_GLOBAL_CFG (SMB_IDLE_PRD | SMB_MEM_WR | SMB_MEM_RD | \ > + SMB_BURST_LEN) > + > +/* 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) What does the value GENMASK(19, 16) indicate for SMB_FLOW ? That is the value being passed down. Please add a descriptive name. .e.g, #define SMB_FLOW_MODE_X GENMASK(19, 16) Similarly for SMB_BUF_NOTE_MASK, unless there is an explanation. > +#define SMB_BUF_CFG_STREAMING (SMB_BUF_INIT | SMB_BUF_CONTINUOUS | \ > + SMB_FLOW_MASK | SMB_BUF_SINGLE_END | \ > + SMB_BUF_EN) > + > +#define SMB_BASE_LOW_MASK GENMASK(31, 0) > + > +/* Set SMB_LB_CFG_HI register */ > +#define SMB_MSG_FILTER GENMASK(15, 8) > + > +/* Set SMB_LB_INT_CTRL */ > +#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. Please align the field definitions. > + * @data_size : Size of Trace data copy to userspace. > + * @rd_offset : Offset of the read pointer in the buffer. > + * @wr_offset : Offset of the write pointer in the buffer. > + * @status : Status of SMB buffer. > + */ > +struct smb_data_buffer { > + void __iomem *buf_base; > + u32 start_addr; > + unsigned long buf_size; > + unsigned long data_size; > + unsigned long rd_offset; > + unsigned long wr_offset; > + bool full; > +}; > + > +/** > + * 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.smb" 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. Same as above. > + * @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_reg(name, offset) coresight_simple_reg32(struct smb_drv_data, name, offset) > + > +#endif Suzuki
Hi Suzuki, On 2022/6/7 16:33, Suzuki K Poulose wrote: > Hi Qi > > On 06/06/2022 14:02, 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. > > nit: "CPU instruction trace" 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 <liuqi115@huawei.com> >> Tested-by: JunHao He <hejunhao2@hisilicon.com> >> --- >> drivers/hwtracing/coresight/Kconfig | 10 + >> drivers/hwtracing/coresight/Makefile | 1 + >> drivers/hwtracing/coresight/ultrasoc-smb.c | 663 +++++++++++++++++++++ >> drivers/hwtracing/coresight/ultrasoc-smb.h | 110 ++++ >> 4 files changed, 784 insertions(+) >> create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.c >> create mode 100644 drivers/hwtracing/coresight/ultrasoc-smb.h >> >> diff --git a/drivers/hwtracing/coresight/Kconfig >> b/drivers/hwtracing/coresight/Kconfig >> index 514a9b8086e3..4380eb1a0a73 100644 >> --- a/drivers/hwtracing/coresight/Kconfig >> +++ b/drivers/hwtracing/coresight/Kconfig > > ... > >> diff --git a/drivers/hwtracing/coresight/Makefile >> b/drivers/hwtracing/coresight/Makefile >> index b6c4a48140ec..344dba8d6ff8 100644 >> --- a/drivers/hwtracing/coresight/Makefile >> +++ b/drivers/hwtracing/coresight/Makefile >> @@ -27,3 +27,4 @@ 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-smb.o >> diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c >> b/drivers/hwtracing/coresight/ultrasoc-smb.c >> new file mode 100644 >> index 000000000000..44b4bceb6f28 >> --- /dev/null >> +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c > > ... > >> +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); >> + unsigned long flags; >> + int ret = 0; >> + >> + spin_lock_irqsave(&drvdata->spinlock, flags); >> + >> + if (local_read(&drvdata->reading)) { >> + ret = -EBUSY; >> + goto out; >> + } >> + >> + if (drvdata->mode == CS_MODE_PERF) { >> + ret = -EINVAL; >> + goto out; >> + } >> + >> +out: >> + spin_unlock_irqrestore(&drvdata->spinlock, flags); >> + return ret; >> +} >> + >> +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 (atomic_read(drvdata->csdev->refcnt)) { >> + spin_unlock_irqrestore(&drvdata->spinlock, flags); >> + return -EBUSY; >> + } >> + >> + if (local_cmpxchg(&drvdata->reading, 0, 1)) { >> + spin_unlock_irqrestore(&drvdata->spinlock, flags); >> + return -EBUSY; >> + } >> + > > Shouldn't this be done in smb_open() ? Otherwise, a subsequent read > will fail with EBUSY ? > i.e, > fd = open(/dev/ultra_smb0, ..); > > # size of the SMB buffer = 1M, > size = read(fd, buf, SZ_4K); > /* Do something the buf */ > if (size >= 0) > size = read(fd, buf, SZ_4K); > > ^^ This would fail, isn't it ? > Yes, I'll change it to: 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); unsigned long flags; int ret = 0; spin_lock_irqsave(&drvdata->spinlock, flags); if (local_read(&drvdata->reading)) { ret = -EBUSY; goto out; } if (drvdata->mode != CS_MODE_DISABLED) { ret = -EBUSY; goto out; } local_set(&drvdata->reading, 1); out: spin_unlock_irqrestore(&drvdata->spinlock, flags); return ret; } So SMB data can only be read when SMB is disabled, and could be read subsequently. >> + if (!sdb->data_size) { >> + smb_update_data_size(drvdata); >> + if (!sdb->data_size) >> + goto out; >> + } >> + >> + to_copy = min(sdb->data_size, len); >> + >> + /* Copy parts of trace data when read pointer 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_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; >> + > > I believe these fields should be dropped and instead use the > handle->head, to determine the page number and offset. See the > TMC-ETR driver for e.g. got it, I'll do this next time. > >> + local_set(&buf->data_size, 0); >> + >> + 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); >> + int ret; >> + >> + /* Do nothing if trace data is reading by other interface now */ >> + if (local_read(&drvdata->reading)) >> + return -EBUSY; >> + > > Is there global switch for all the inports ? Or is there a control for > individual inports to the SMB ? Do we need additional information here > to enable the corresponding port ? There is a global switch to enable and disable all the inports in smb_config_inport() when probe the SMB driver. > >> + switch (mode) { >> + case CS_MODE_SYSFS: >> + ret = smb_enable_sysfs(csdev); >> + break; >> + case CS_MODE_PERF: >> + ret = smb_enable_perf(csdev, data); >> + break; >> + default: >> + ret = -EINVAL; >> + break; >> + } >> + >> + if (ret) >> + return ret; >> + dev_dbg(&csdev->dev, "Ultrasoc SMB enabled.\n"); >> + >> + return 0; >> +} >> + >> + >> +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) > > You may need to pass the aux_handle here, to determine the handle->head > and the size. See my comments above. ok, I'll do this next time, thanks. > >> +{ >> + struct smb_data_buffer *sdb = &drvdata->sdb; >> + char **dst_pages = (char **)buf->data_pages; >> + unsigned long page_offset = buf->offset; >> + unsigned int cur = buf->cur; >> + unsigned long to_copy; >> + >> + while (data_size) { >> + unsigned long page_space = PAGE_SIZE - page_offset; >> + >> + /* Copy parts of trace data when read pointer wrap around */ >> + if (sdb->rd_offset + page_space > sdb->buf_size) >> + to_copy = sdb->buf_size - sdb->rd_offset; >> + else >> + to_copy = min(data_size, page_space); >> + >> + memcpy_fromio(dst_pages[cur] + page_offset, >> + sdb->buf_base + sdb->rd_offset, to_copy); >> + >> + page_offset += to_copy; >> + if (page_offset >= PAGE_SIZE) { >> + page_offset = 0; >> + cur++; >> + cur %= buf->nr_pages; >> + } >> + data_size -= to_copy; >> + 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); >> + >> + /* >> + * Data remained in link cannot be purged when SMB is full, so >> + * synchronize the read pointer to write pointer, to make sure >> + * these remained data won't influence next trace. >> + */ >> + if (sdb->full) { >> + smb_purge_data(drvdata); >> + writel(readl(drvdata->base + SMB_LB_WR_ADDR), >> + drvdata->base + SMB_LB_RD_ADDR); >> + } >> + smb_reset_buffer_status(drvdata); >> +} >> + >> + >> +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); > > Please fill in the csdev_access method for the device. will do this next time, thanks. Thanks, Qi > desc.access = CSDEV_ACCESS_IOMEM(drvdata->base); > >> + 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); >> +} >> + >> +static int smb_config_inport(struct device *dev, bool enable) >> +{ >> + u64 func = enable ? 1 : 0; >> + union acpi_object *obj; >> + guid_t guid; >> + u64 rev = 0; >> + >> + /* >> + * Using DSM calls to enable/disable ultrasoc hardwares on >> + * tracing path, to prevent ultrasoc packet format being exposed. >> + */ >> + if (guid_parse(ULTRASOC_SMB_DSM_UUID, &guid)) { >> + dev_err(dev, "Get GUID failed.\n"); >> + return -EINVAL; >> + } >> + >> + obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, rev, func, NULL); >> + if (!obj) >> + dev_err(dev, "ACPI handle failed!\n"); >> + else >> + 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"); > > "UltraSoc SMB CoreSight driver" > >> +MODULE_LICENSE("Dual MIT/GPL"); >> +MODULE_AUTHOR("Jonathan Zhou <jonathan.zhouwen@huawei.com>"); >> +MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>"); > >> diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.h >> b/drivers/hwtracing/coresight/ultrasoc-smb.h >> new file mode 100644 >> index 000000000000..a01f869fe122 >> --- /dev/null >> +++ b/drivers/hwtracing/coresight/ultrasoc-smb.h >> @@ -0,0 +1,110 @@ >> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ >> +/* >> + * Siemens System Memory Buffer driver. >> + * Copyright(c) 2021, HiSilicon Limited. >> + */ >> + >> +#ifndef _ULTRASOC_SMB_H >> +#define _ULTRASOC_SMB_H >> + >> +#include <linux/coresight.h> >> +#include <linux/list.h> >> +#include <linux/miscdevice.h> >> + >> +#include "coresight-etm-perf.h" >> +#include "coresight-priv.h" >> + >> +/* Offset of SMB logical buffer registers */ >> +#define SMB_CFG_REG 0x00 >> +#define SMB_GLOBAL_EN 0x04 >> +#define SMB_GLOBAL_INT 0x08 >> +#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_BURST_LEN GENMASK(7, 4) >> +#define SMB_IDLE_PRD GENMASK(15, 12) >> +#define SMB_MEM_WR GENMASK(17, 16) >> +#define SMB_MEM_RD (GENMASK(26, 25) | GENMASK(23, 22)) >> +#define SMB_GLOBAL_CFG (SMB_IDLE_PRD | SMB_MEM_WR | >> SMB_MEM_RD | \ >> + SMB_BURST_LEN) >> + >> +/* 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) > > What does the value GENMASK(19, 16) indicate for SMB_FLOW ? That is the > value being passed down. Please add a descriptive name. > .e.g, > > #define SMB_FLOW_MODE_X GENMASK(19, 16) > > Similarly for SMB_BUF_NOTE_MASK, unless there is an explanation. > >> +#define SMB_BUF_CFG_STREAMING (SMB_BUF_INIT | SMB_BUF_CONTINUOUS >> | \ >> + SMB_FLOW_MASK | SMB_BUF_SINGLE_END | \ >> + SMB_BUF_EN) >> + >> +#define SMB_BASE_LOW_MASK GENMASK(31, 0) >> + >> +/* Set SMB_LB_CFG_HI register */ >> +#define SMB_MSG_FILTER GENMASK(15, 8) >> + >> +/* Set SMB_LB_INT_CTRL */ >> +#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. > > Please align the field definitions. > >> + * @data_size : Size of Trace data copy to userspace. >> + * @rd_offset : Offset of the read pointer in the buffer. >> + * @wr_offset : Offset of the write pointer in the buffer. >> + * @status : Status of SMB buffer. >> + */ >> +struct smb_data_buffer { >> + void __iomem *buf_base; >> + u32 start_addr; >> + unsigned long buf_size; >> + unsigned long data_size; >> + unsigned long rd_offset; >> + unsigned long wr_offset; >> + bool full; >> +}; >> + >> +/** >> + * 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.smb" 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. > > Same as above. > >> + * @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_reg(name, offset) coresight_simple_reg32(struct >> smb_drv_data, name, offset) >> + >> +#endif > > Suzuki > .
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 514a9b8086e3..4380eb1a0a73 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -201,4 +201,14 @@ config CORESIGHT_TRBE To compile this driver as a module, choose M here: the module will be called coresight-trbe. +config ULTRASOC_SMB + tristate "Ultrasoc system memory buffer drivers" + depends on ACPI && ARM64 && CORESIGHT_LINKS_AND_SINKS + help + This driver provides support for the Ultrasoc system memory buffer (SMB). + SMB is responsible for receiving the trace data from Coresight ETM devices + and storing them to a system buffer. + + To compile this driver as a module, choose M here: the module will be + called ultrasoc-smb. endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index b6c4a48140ec..344dba8d6ff8 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -27,3 +27,4 @@ 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-smb.o diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c new file mode 100644 index 000000000000..44b4bceb6f28 --- /dev/null +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c @@ -0,0 +1,663 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* + * Siemens System Memory Buffer driver. + * Copyright(c) 2021, HiSilicon Limited. + */ + +#include <linux/acpi.h> +#include <linux/circ_buf.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> + +#include "ultrasoc-smb.h" + +DEFINE_CORESIGHT_DEVLIST(sink_devs, "ultra_smb"); + +#define ULTRASOC_SMB_DSM_UUID "82ae1283-7f6a-4cbe-aa06-53e8fb24db18" + +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 void smb_buffer_sync_status(struct smb_drv_data *drvdata) +{ + struct smb_data_buffer *sdb = &drvdata->sdb; + + sdb->wr_offset = readl(drvdata->base + SMB_LB_WR_ADDR) - sdb->start_addr; + sdb->rd_offset = readl(drvdata->base + SMB_LB_RD_ADDR) - sdb->start_addr; + if (sdb->wr_offset == sdb->rd_offset && !smb_buffer_is_empty(drvdata)) + sdb->full = true; + else + sdb->full = false; +} + +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 in case them influence next trace */ +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; + + smb_purge_data(drvdata); + smb_buffer_sync_status(drvdata); + if (sdb->full) { + sdb->data_size = sdb->buf_size; + return; + } + + sdb->data_size = CIRC_CNT(sdb->wr_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); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (local_read(&drvdata->reading)) { + ret = -EBUSY; + goto out; + } + + if (drvdata->mode == CS_MODE_PERF) { + ret = -EINVAL; + goto out; + } + +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return ret; +} + +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 (atomic_read(drvdata->csdev->refcnt)) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EBUSY; + } + + if (local_cmpxchg(&drvdata->reading, 0, 1)) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EBUSY; + } + + if (!sdb->data_size) { + smb_update_data_size(drvdata); + if (!sdb->data_size) + goto out; + } + + to_copy = min(sdb->data_size, len); + + /* Copy parts of trace data when read pointer 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_reg(read_pos, SMB_LB_RD_ADDR); +smb_reg(write_pos, SMB_LB_WR_ADDR); +smb_reg(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 = "mgmt", +}; + +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 coresight_device *csdev) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_PERF) { + ret = -EBUSY; + goto out; + } + + if (drvdata->mode == CS_MODE_DISABLED) { + smb_enable_hw(drvdata); + drvdata->mode = CS_MODE_SYSFS; + } + + atomic_inc(csdev->refcnt); +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return ret; +} + +static int smb_enable_perf(struct coresight_device *csdev, void *data) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + struct device *dev = &drvdata->csdev->dev; + struct perf_output_handle *handle = data; + struct cs_buffers *buf = etm_perf_sink_config(handle); + unsigned long flags; + int ret = 0; + pid_t pid; + + spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_SYSFS) { + dev_dbg(dev, "Device is already in used by sysfs.\n"); + ret = -EBUSY; + goto out; + } + + /* Get a handle on the pid of the target process */ + pid = buf->pid; + if (drvdata->pid != -1 && drvdata->pid != pid) { + dev_dbg(dev, "Device is already in used by other session.\n"); + ret = -EBUSY; + goto out; + } + + /* The sink is already enabled by this session */ + if (drvdata->pid == pid) { + atomic_inc(csdev->refcnt); + goto out; + } + + ret = smb_set_perf_buffer(handle); + if (ret) + goto out; + + smb_enable_hw(drvdata); + drvdata->pid = pid; + drvdata->mode = CS_MODE_PERF; + atomic_inc(csdev->refcnt); +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return ret; +} + +static int smb_enable(struct coresight_device *csdev, u32 mode, void *data) +{ + struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent); + int ret; + + /* Do nothing if trace data is reading by other interface now */ + if (local_read(&drvdata->reading)) + return -EBUSY; + + switch (mode) { + case CS_MODE_SYSFS: + ret = smb_enable_sysfs(csdev); + break; + case CS_MODE_PERF: + ret = smb_enable_perf(csdev, data); + break; + default: + ret = -EINVAL; + break; + } + + if (ret) + return ret; + 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 (local_read(&drvdata->reading)) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EBUSY; + } + + 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); + smb_purge_data(drvdata); + + /* 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; + buf->pid = task_pid_nr(event->owner); + + 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 page_offset = buf->offset; + unsigned int cur = buf->cur; + unsigned long to_copy; + + while (data_size) { + unsigned long page_space = PAGE_SIZE - page_offset; + + /* Copy parts of trace data when read pointer wrap around */ + if (sdb->rd_offset + page_space > sdb->buf_size) + to_copy = sdb->buf_size - sdb->rd_offset; + else + to_copy = min(data_size, page_space); + + memcpy_fromio(dst_pages[cur] + page_offset, + sdb->buf_base + sdb->rd_offset, to_copy); + + page_offset += to_copy; + if (page_offset >= PAGE_SIZE) { + page_offset = 0; + cur++; + cur %= buf->nr_pages; + } + data_size -= to_copy; + 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); + + /* + * Data remained in link cannot be purged when SMB is full, so + * synchronize the read pointer to write pointer, to make sure + * these remained data won't influence next trace. + */ + if (sdb->full) { + smb_purge_data(drvdata); + writel(readl(drvdata->base + SMB_LB_WR_ADDR), + 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_disable_hw(drvdata); + smb_update_data_size(drvdata); + data_size = sdb->data_size; + + /* + * The SMB buffer may be bigger than the space available in the + * perf ring buffer (handle->size). If so advance the offset so + * that we get the latest trace data. + */ + 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); + + smb_enable_hw(drvdata); +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 failed to get resource.\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) +{ + /* First disable smb and clear the status of SMB buffer */ + smb_reset_buffer_status(drvdata); + smb_disable_hw(drvdata); + smb_purge_data(drvdata); + + writel(SMB_BUF_CFG_STREAMING, drvdata->base + SMB_LB_CFG_LO); + writel(SMB_MSG_FILTER, 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); +} + +static int smb_config_inport(struct device *dev, bool enable) +{ + u64 func = enable ? 1 : 0; + union acpi_object *obj; + guid_t guid; + u64 rev = 0; + + /* + * Using DSM calls to enable/disable ultrasoc hardwares on + * tracing path, to prevent ultrasoc packet format being exposed. + */ + if (guid_parse(ULTRASOC_SMB_DSM_UUID, &guid)) { + dev_err(dev, "Get GUID failed.\n"); + return -EINVAL; + } + + obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, rev, func, NULL); + if (!obj) + dev_err(dev, "ACPI handle failed!\n"); + else + 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 <jonathan.zhouwen@huawei.com>"); +MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>"); diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.h b/drivers/hwtracing/coresight/ultrasoc-smb.h new file mode 100644 index 000000000000..a01f869fe122 --- /dev/null +++ b/drivers/hwtracing/coresight/ultrasoc-smb.h @@ -0,0 +1,110 @@ +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */ +/* + * Siemens System Memory Buffer driver. + * Copyright(c) 2021, HiSilicon Limited. + */ + +#ifndef _ULTRASOC_SMB_H +#define _ULTRASOC_SMB_H + +#include <linux/coresight.h> +#include <linux/list.h> +#include <linux/miscdevice.h> + +#include "coresight-etm-perf.h" +#include "coresight-priv.h" + +/* Offset of SMB logical buffer registers */ +#define SMB_CFG_REG 0x00 +#define SMB_GLOBAL_EN 0x04 +#define SMB_GLOBAL_INT 0x08 +#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_BURST_LEN GENMASK(7, 4) +#define SMB_IDLE_PRD GENMASK(15, 12) +#define SMB_MEM_WR GENMASK(17, 16) +#define SMB_MEM_RD (GENMASK(26, 25) | GENMASK(23, 22)) +#define SMB_GLOBAL_CFG (SMB_IDLE_PRD | SMB_MEM_WR | SMB_MEM_RD | \ + SMB_BURST_LEN) + +/* 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 | SMB_BUF_SINGLE_END | \ + SMB_BUF_EN) + +#define SMB_BASE_LOW_MASK GENMASK(31, 0) + +/* Set SMB_LB_CFG_HI register */ +#define SMB_MSG_FILTER GENMASK(15, 8) + +/* Set SMB_LB_INT_CTRL */ +#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. + * @wr_offset : Offset of the write pointer in the buffer. + * @status : Status of SMB buffer. + */ +struct smb_data_buffer { + void __iomem *buf_base; + u32 start_addr; + unsigned long buf_size; + unsigned long data_size; + unsigned long rd_offset; + unsigned long wr_offset; + bool full; +}; + +/** + * 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.smb" 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_reg(name, offset) coresight_simple_reg32(struct smb_drv_data, name, offset) + +#endif