@@ -201,4 +201,16 @@ 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 || COMPILE_TEST
+ depends on 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
@@ -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
new file mode 100644
@@ -0,0 +1,648 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Siemens System Memory Buffer driver.
+ * Copyright(c) 2022, HiSilicon Limited.
+ */
+
+#include <linux/atomic.h>
+#include <linux/acpi.h>
+#include <linux/circ_buf.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+
+#include "coresight-etm-perf.h"
+#include "coresight-priv.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_not_empty(struct smb_drv_data *drvdata)
+{
+ u32 buf_status = readl(drvdata->base + SMB_LB_INT_STS_REG);
+
+ return FIELD_GET(SMB_LB_INT_STS_NOT_EMPTY_MSK, buf_status);
+}
+
+static void smb_update_data_size(struct smb_drv_data *drvdata)
+{
+ struct smb_data_buffer *sdb = &drvdata->sdb;
+ u32 buf_wrptr;
+
+ buf_wrptr = readl(drvdata->base + SMB_LB_WR_ADDR_REG) -
+ sdb->buf_hw_base;
+
+ /* Buffer is full */
+ if (buf_wrptr == sdb->buf_rdptr && smb_buffer_not_empty(drvdata)) {
+ sdb->data_size = sdb->buf_size;
+ return;
+ }
+
+ /* The buffer mode is circular buffer mode */
+ sdb->data_size = CIRC_CNT(buf_wrptr, sdb->buf_rdptr,
+ sdb->buf_size);
+}
+
+/*
+ * The read pointer adds @nbytes bytes (may round up to the beginning)
+ * after the data is read or discarded, while needing to update the
+ * available data size.
+ */
+static void smb_update_read_ptr(struct smb_drv_data *drvdata, u32 nbytes)
+{
+ struct smb_data_buffer *sdb = &drvdata->sdb;
+
+ sdb->buf_rdptr += nbytes;
+ sdb->buf_rdptr %= sdb->buf_size;
+ writel(sdb->buf_hw_base + sdb->buf_rdptr,
+ drvdata->base + SMB_LB_RD_ADDR_REG);
+
+ sdb->data_size -= nbytes;
+}
+
+static void smb_reset_buffer(struct smb_drv_data *drvdata)
+{
+ struct smb_data_buffer *sdb = &drvdata->sdb;
+ u32 write_ptr;
+
+ /*
+ * We must flush and discard any data left in hardware path
+ * to avoid corrupting the next session.
+ * Note: The write pointer will never exceed the read pointer.
+ */
+ writel(SMB_LB_PURGE_PURGED, drvdata->base + SMB_LB_PURGE_REG);
+
+ /* Reset SMB logical buffer status flags */
+ writel(SMB_LB_INT_STS_RESET, drvdata->base + SMB_LB_INT_STS_REG);
+
+ write_ptr = readl(drvdata->base + SMB_LB_WR_ADDR_REG);
+
+ /* Do nothing, not data left in hardware path */
+ if (!write_ptr || write_ptr == sdb->buf_rdptr + sdb->buf_hw_base)
+ return;
+
+ /*
+ * The SMB_LB_WR_ADDR_REG register is read-only,
+ * Synchronize the read pointer to write pointer.
+ */
+ writel(write_ptr, drvdata->base + SMB_LB_RD_ADDR_REG);
+ sdb->buf_rdptr = write_ptr - sdb->buf_hw_base;
+}
+
+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);
+ int ret = 0;
+
+ mutex_lock(&drvdata->mutex);
+
+ if (drvdata->reading) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (atomic_read(drvdata->csdev->refcnt)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ smb_update_data_size(drvdata);
+
+ drvdata->reading = true;
+out:
+ mutex_unlock(&drvdata->mutex);
+
+ 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;
+ ssize_t to_copy = 0;
+
+ if (!len)
+ return 0;
+
+ mutex_lock(&drvdata->mutex);
+
+ 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->buf_rdptr + to_copy > sdb->buf_size)
+ to_copy = sdb->buf_size - sdb->buf_rdptr;
+
+ if (copy_to_user(data, sdb->buf_base + sdb->buf_rdptr, to_copy)) {
+ dev_dbg(dev, "Failed to copy data to user\n");
+ to_copy = -EFAULT;
+ goto out;
+ }
+
+ *ppos += to_copy;
+
+ smb_update_read_ptr(drvdata, to_copy);
+
+ dev_dbg(dev, "%zu bytes copied\n", to_copy);
+out:
+ if (!sdb->data_size)
+ smb_reset_buffer(drvdata);
+ mutex_unlock(&drvdata->mutex);
+
+ 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);
+
+ mutex_lock(&drvdata->mutex);
+ drvdata->reading = false;
+ mutex_unlock(&drvdata->mutex);
+
+ return 0;
+}
+
+static const struct file_operations smb_fops = {
+ .owner = THIS_MODULE,
+ .open = smb_open,
+ .read = smb_read,
+ .release = smb_release,
+ .llseek = no_llseek,
+};
+
+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[] = {
+ coresight_simple_reg32(read_pos, SMB_LB_RD_ADDR_REG),
+ coresight_simple_reg32(write_pos, SMB_LB_WR_ADDR_REG),
+ coresight_simple_reg32(buf_status, SMB_LB_INT_STS_REG),
+ &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 void smb_enable_hw(struct smb_drv_data *drvdata)
+{
+ writel(SMB_GLB_EN_HW_ENABLE, drvdata->base + SMB_GLB_EN_REG);
+}
+
+static void smb_disable_hw(struct smb_drv_data *drvdata)
+{
+ writel(0x0, drvdata->base + SMB_GLB_EN_REG);
+}
+
+static void smb_enable_sysfs(struct coresight_device *csdev)
+{
+ struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ if (drvdata->mode != CS_MODE_DISABLED)
+ return;
+
+ smb_enable_hw(drvdata);
+ drvdata->mode = CS_MODE_SYSFS;
+}
+
+static int smb_enable_perf(struct coresight_device *csdev, void *data)
+{
+ struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
+ struct perf_output_handle *handle = data;
+ struct cs_buffers *buf = etm_perf_sink_config(handle);
+ pid_t pid;
+
+ if (!buf)
+ return -EINVAL;
+
+ /* Get a handle on the pid of the target process */
+ pid = buf->pid;
+
+ /* Device is already in used by other session */
+ if (drvdata->pid != -1 && drvdata->pid != pid)
+ return -EBUSY;
+
+ if (drvdata->pid == -1) {
+ 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);
+ int ret = 0;
+
+ mutex_lock(&drvdata->mutex);
+
+ /* Do nothing, the trace data is reading by other interface now */
+ if (drvdata->reading) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ /* Do nothing, the SMB is already enabled as other mode */
+ if (drvdata->mode != CS_MODE_DISABLED && drvdata->mode != mode) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ switch (mode) {
+ case CS_MODE_SYSFS:
+ smb_enable_sysfs(csdev);
+ break;
+ case CS_MODE_PERF:
+ ret = smb_enable_perf(csdev, data);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret)
+ goto out;
+
+ atomic_inc(csdev->refcnt);
+
+ dev_dbg(&csdev->dev, "Ultrasoc SMB enabled\n");
+out:
+ mutex_unlock(&drvdata->mutex);
+
+ return ret;
+}
+
+static int smb_disable(struct coresight_device *csdev)
+{
+ struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
+ int ret = 0;
+
+ mutex_lock(&drvdata->mutex);
+
+ if (drvdata->reading) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (atomic_dec_return(csdev->refcnt)) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ /* Complain if we (somehow) got out of sync */
+ WARN_ON_ONCE(drvdata->mode == CS_MODE_DISABLED);
+
+ smb_disable_hw(drvdata);
+
+ /* Dissociate from the target process. */
+ drvdata->pid = -1;
+ drvdata->mode = CS_MODE_DISABLED;
+
+ dev_dbg(&csdev->dev, "Ultrasoc SMB disabled\n");
+out:
+ mutex_unlock(&drvdata->mutex);
+
+ return ret;
+}
+
+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 head)
+{
+ struct smb_data_buffer *sdb = &drvdata->sdb;
+ char **dst_pages = (char **)buf->data_pages;
+ unsigned long to_copy;
+ long pg_idx, pg_offset;
+
+ pg_idx = head >> PAGE_SHIFT;
+ pg_offset = head & (PAGE_SIZE - 1);
+
+ while (sdb->data_size) {
+ unsigned long pg_space = PAGE_SIZE - pg_offset;
+
+ to_copy = min(sdb->data_size, pg_space);
+
+ /* Copy parts of trace data when read pointer wrap around */
+ if (sdb->buf_rdptr + to_copy > sdb->buf_size)
+ to_copy = sdb->buf_size - sdb->buf_rdptr;
+
+ memcpy(dst_pages[pg_idx] + pg_offset,
+ sdb->buf_base + sdb->buf_rdptr, to_copy);
+
+ pg_offset += to_copy;
+ if (pg_offset >= PAGE_SIZE) {
+ pg_offset = 0;
+ pg_idx++;
+ pg_idx %= buf->nr_pages;
+ }
+ smb_update_read_ptr(drvdata, to_copy);
+ }
+
+ smb_reset_buffer(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;
+ bool lost = false;
+
+ if (!buf)
+ return 0;
+
+ mutex_lock(&drvdata->mutex);
+
+ /* 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);
+
+ /*
+ * 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 (sdb->data_size > handle->size) {
+ smb_update_read_ptr(drvdata, sdb->data_size - handle->size);
+ lost = true;
+ }
+
+ data_size = sdb->data_size;
+ smb_sync_perf_buffer(drvdata, buf, handle->head);
+ if (!buf->snapshot && lost)
+ perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
+out:
+ mutex_unlock(&drvdata->mutex);
+
+ 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 *base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, SMB_BUF_ADDR_RES);
+ if (IS_ERR(res)) {
+ dev_err(&pdev->dev, "SMB device failed to get resource\n");
+ return -EINVAL;
+ }
+
+ sdb->buf_rdptr = 0;
+ sdb->buf_hw_base = FIELD_GET(SMB_BUF_ADDR_LO_MSK, res->start);
+ sdb->buf_size = resource_size(res);
+ if (sdb->buf_size == 0)
+ return -EINVAL;
+
+ /*
+ * This is a chunk of memory, use classic mapping with better
+ * performance.
+ */
+ base = devm_memremap(&pdev->dev, sdb->buf_hw_base, sdb->buf_size,
+ MEMREMAP_WB);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ sdb->buf_base = base;
+
+ return 0;
+}
+
+static void smb_init_hw(struct smb_drv_data *drvdata)
+{
+ smb_disable_hw(drvdata);
+ smb_reset_buffer(drvdata);
+
+ writel(SMB_LB_CFG_LO_DEFAULT, drvdata->base + SMB_LB_CFG_LO_REG);
+ writel(SMB_LB_CFG_HI_DEFAULT, drvdata->base + SMB_LB_CFG_HI_REG);
+ writel(SMB_GLB_CFG_DEFAULT, drvdata->base + SMB_GLB_CFG_REG);
+ writel(SMB_GLB_INT_CFG, drvdata->base + SMB_GLB_INT_REG);
+ writel(SMB_LB_INT_CTRL_CFG, drvdata->base + SMB_LB_INT_CTRL_REG);
+}
+
+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;
+ }
+ desc.access = CSDEV_ACCESS_IOMEM(drvdata->base);
+
+ 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");
+ return -ENODEV;
+ }
+
+ ACPI_FREE(obj);
+
+ return 0;
+}
+
+static int smb_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct smb_drv_data *drvdata;
+ int ret;
+
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->base = devm_platform_ioremap_resource(pdev, SMB_REG_ADDR_RES);
+ if (IS_ERR(drvdata->base)) {
+ dev_err(dev, "Failed to ioremap resource\n");
+ return PTR_ERR(drvdata->base);
+ }
+
+ smb_init_hw(drvdata);
+
+ ret = smb_init_data_buffer(pdev, &drvdata->sdb);
+ if (ret) {
+ dev_err(dev, "Failed to init buffer, ret = %d\n", ret);
+ return ret;
+ }
+
+ mutex_init(&drvdata->mutex);
+ drvdata->pid = -1;
+
+ ret = smb_register_sink(pdev, drvdata);
+ if (ret) {
+ dev_err(dev, "Failed to register SMB sink\n");
+ return ret;
+ }
+
+ ret = smb_config_inport(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;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id ultrasoc_smb_acpi_match[] = {
+ {"HISI03A1", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, ultrasoc_smb_acpi_match);
+#endif
+
+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 CoreSight driver");
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_AUTHOR("Jonathan Zhou <jonathan.zhouwen@huawei.com>");
+MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>");
new file mode 100644
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+/*
+ * Siemens System Memory Buffer driver.
+ * Copyright(c) 2022, HiSilicon Limited.
+ */
+
+#ifndef _ULTRASOC_SMB_H
+#define _ULTRASOC_SMB_H
+
+#include <linux/miscdevice.h>
+#include <linux/mutex.h>
+
+/* Offset of SMB global registers */
+#define SMB_GLB_CFG_REG 0x00
+#define SMB_GLB_EN_REG 0x04
+#define SMB_GLB_INT_REG 0x08
+
+/* Offset of SMB logical buffer registers */
+#define SMB_LB_CFG_LO_REG 0x40
+#define SMB_LB_CFG_HI_REG 0x44
+#define SMB_LB_INT_CTRL_REG 0x48
+#define SMB_LB_INT_STS_REG 0x4c
+#define SMB_LB_RD_ADDR_REG 0x5c
+#define SMB_LB_WR_ADDR_REG 0x60
+#define SMB_LB_PURGE_REG 0x64
+
+/* Set global config register */
+#define SMB_GLB_CFG_BURST_LEN_MSK GENMASK(11, 4)
+#define SMB_GLB_CFG_IDLE_PRD_MSK GENMASK(15, 12)
+#define SMB_GLB_CFG_MEM_WR_MSK GENMASK(21, 16)
+#define SMB_GLB_CFG_MEM_RD_MSK GENMASK(27, 22)
+#define SMB_GLB_CFG_DEFAULT (FIELD_PREP(SMB_GLB_CFG_BURST_LEN_MSK, 0xf) | \
+ FIELD_PREP(SMB_GLB_CFG_IDLE_PRD_MSK, 0xf) | \
+ FIELD_PREP(SMB_GLB_CFG_MEM_WR_MSK, 0x3) | \
+ FIELD_PREP(SMB_GLB_CFG_MEM_RD_MSK, 0x1b))
+
+#define SMB_GLB_EN_HW_ENABLE BIT(0)
+
+/* Set global interrupt control register */
+#define SMB_GLB_INT_EN BIT(0)
+#define SMB_GLB_INT_PULSE BIT(1) /* Interrupt type: 1 - Pulse */
+#define SMB_GLB_INT_ACT_H BIT(2) /* Interrupt polarity: 1 - Active high */
+#define SMB_GLB_INT_CFG (SMB_GLB_INT_EN | SMB_GLB_INT_PULSE | \
+ SMB_GLB_INT_ACT_H)
+
+/* Set logical buffer config register lower 32 bits */
+#define SMB_LB_CFG_LO_EN BIT(0)
+#define SMB_LB_CFG_LO_SINGLE_END BIT(1)
+#define SMB_LB_CFG_LO_INIT BIT(8)
+#define SMB_LB_CFG_LO_CONT BIT(11)
+#define SMB_LB_CFG_LO_FLOW_MSK GENMASK(19, 16)
+#define SMB_LB_CFG_LO_DEFAULT (SMB_LB_CFG_LO_EN | SMB_LB_CFG_LO_SINGLE_END | \
+ SMB_LB_CFG_LO_INIT | SMB_LB_CFG_LO_CONT | \
+ FIELD_PREP(SMB_LB_CFG_LO_FLOW_MSK, 0xf))
+
+/* Set logical buffer config register upper 32 bits */
+#define SMB_LB_CFG_HI_RANGE_UP_MSK GENMASK(15, 8)
+#define SMB_LB_CFG_HI_DEFAULT FIELD_PREP(SMB_LB_CFG_HI_RANGE_UP_MSK, 0xff)
+
+/*
+ * Set logical buffer interrupt control register.
+ * The register control the validity of both real-time events and
+ * interrupts. When logical buffer status changes causes to issue
+ * an interrupt at the same time as it issues a real-time event.
+ * Real-time events are used in SMB driver, which needs to get the buffer
+ * status. Interrupts are used in debugger mode.
+ * SMB_LB_INT_CTRL_BUF_NOTE_MASK control which events flags or interrupts
+ * are valid.
+ */
+#define SMB_LB_INT_CTRL_EN BIT(0)
+#define SMB_LB_INT_CTRL_BUF_NOTE_MSK GENMASK(11, 8)
+#define SMB_LB_INT_CTRL_CFG (SMB_LB_INT_CTRL_EN | \
+ FIELD_PREP(SMB_LB_INT_CTRL_BUF_NOTE_MSK, 0xf))
+
+/* Set logical buffer interrupt status register */
+#define SMB_LB_INT_STS_NOT_EMPTY_MSK BIT(0)
+#define SMB_LB_INT_STS_BUF_RESET_MSK GENMASK(3, 0)
+#define SMB_LB_INT_STS_RESET FIELD_PREP(SMB_LB_INT_STS_BUF_RESET_MSK, 0xf)
+
+#define SMB_LB_PURGE_PURGED BIT(0)
+
+#define SMB_REG_ADDR_RES 0
+#define SMB_BUF_ADDR_RES 1
+#define SMB_BUF_ADDR_LO_MSK GENMASK(31, 0)
+
+/**
+ * struct smb_data_buffer - Details of the buffer used by SMB
+ * @buf_base: Memory mapped base address of SMB.
+ * @buf_hw_base: SMB buffer start Physical base address, only used 32bits.
+ * @buf_size: Size of the buffer.
+ * @data_size: Size of the available trace data for SMB.
+ * @buf_rdptr: Current read position (index) within the buffer.
+ */
+struct smb_data_buffer {
+ void *buf_base;
+ u32 buf_hw_base;
+ unsigned long buf_size;
+ unsigned long data_size;
+ unsigned long buf_rdptr;
+};
+
+/**
+ * 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.
+ * @mutex: Control data access to one at a time.
+ * @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;
+ struct mutex mutex;
+ bool reading;
+ pid_t pid;
+ u32 mode;
+};
+
+#endif