Commit cde5a689 authored by huangfangrun's avatar huangfangrun
Browse files

Revert "drivers/coresight: Add Ultrasoc System Memory Buffer driver" 

kunpeng inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I6XLGY


CVE: NA

----------------------------------------------------------------------

This reverts commit b7525bf1.

Signed-off-by: default avatarhuangfangrun <huangfangrun1@h-partners.com>
parent f7ecc8ac

drivers/hwtracing/coresight/Kconfig

+0 −11
Original line number Diff line number Diff line
@@ -188,17 +188,6 @@ 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 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



config ACPI_TRBE

drivers/hwtracing/coresight/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -24,4 +24,3 @@ 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

drivers/hwtracing/coresight/ultrasoc-smb.c

deleted100644 → 0
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Original line number Diff line number Diff line 
// SPDX-License-Identifier: MIT/GPL 

/*

 * 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, "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_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 = "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 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)

{

	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");

	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;

}



#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 driver");

MODULE_LICENSE("Dual MIT/GPL");

MODULE_AUTHOR("Jonathan Zhou <jonathan.zhouwen@huawei.com>");

MODULE_AUTHOR("Qi Liu <liuqi115@huawei.com>");

drivers/hwtracing/coresight/ultrasoc-smb.h

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Original line number Diff line number Diff line 
/* SPDX-License-Identifier: 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			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.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