drivers/misc/cxl/sysfs.c - kernel/bruno - Git at Google

 /*
  * Copyright 2014 IBM Corp.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */

 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>

 #include "cxl.h"

 #define to_afu_chardev_m(d) dev_get_drvdata(d)

 /*********  Adapter attributes  **********************************************/

 static ssize_t caia_version_show(struct device *device,
 				 struct device_attribute *attr,
 				 char *buf)
 {
 	struct cxl *adapter = to_cxl_adapter(device);

 	return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
 			 adapter->caia_minor);
 }

 static ssize_t psl_revision_show(struct device *device,
 				 struct device_attribute *attr,
 				 char *buf)
 {
 	struct cxl *adapter = to_cxl_adapter(device);

 	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
 }

 static ssize_t base_image_show(struct device *device,
 			       struct device_attribute *attr,
 			       char *buf)
 {
 	struct cxl *adapter = to_cxl_adapter(device);

 	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
 }

 static ssize_t image_loaded_show(struct device *device,
 				 struct device_attribute *attr,
 				 char *buf)
 {
 	struct cxl *adapter = to_cxl_adapter(device);

 	if (adapter->user_image_loaded)
 		return scnprintf(buf, PAGE_SIZE, "user\n");
 	return scnprintf(buf, PAGE_SIZE, "factory\n");
 }

 static struct device_attribute adapter_attrs[] = {
 	__ATTR_RO(caia_version),
 	__ATTR_RO(psl_revision),
 	__ATTR_RO(base_image),
 	__ATTR_RO(image_loaded),
 };


 /*********  AFU master specific attributes  **********************************/

 static ssize_t mmio_size_show_master(struct device *device,
 				     struct device_attribute *attr,
 				     char *buf)
 {
 	struct cxl_afu *afu = to_afu_chardev_m(device);

 	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
 }

 static ssize_t pp_mmio_off_show(struct device *device,
 				struct device_attribute *attr,
 				char *buf)
 {
 	struct cxl_afu *afu = to_afu_chardev_m(device);

 	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_offset);
 }

 static ssize_t pp_mmio_len_show(struct device *device,
 				struct device_attribute *attr,
 				char *buf)
 {
 	struct cxl_afu *afu = to_afu_chardev_m(device);

 	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
 }

 static struct device_attribute afu_master_attrs[] = {
 	__ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
 	__ATTR_RO(pp_mmio_off),
 	__ATTR_RO(pp_mmio_len),
 };


 /*********  AFU attributes  **************************************************/

 static ssize_t mmio_size_show(struct device *device,
 			      struct device_attribute *attr,
 			      char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);

 	if (afu->pp_size)
 		return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
 	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
 }

 static ssize_t reset_store_afu(struct device *device,
 			       struct device_attribute *attr,
 			       const char *buf, size_t count)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);
 	int rc;

 	/* Not safe to reset if it is currently in use */
 	mutex_lock(&afu->contexts_lock);
 	if (!idr_is_empty(&afu->contexts_idr)) {
 		rc = -EBUSY;
 		goto err;
 	}

 	if ((rc = cxl_afu_reset(afu)))
 		goto err;

 	rc = count;
 err:
 	mutex_unlock(&afu->contexts_lock);
 	return rc;
 }

 static ssize_t irqs_min_show(struct device *device,
 			     struct device_attribute *attr,
 			     char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);

 	return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
 }

 static ssize_t irqs_max_show(struct device *device,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);

 	return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
 }

 static ssize_t irqs_max_store(struct device *device,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);
 	ssize_t ret;
 	int irqs_max;

 	ret = sscanf(buf, "%i", &irqs_max);
 	if (ret != 1)
 		return -EINVAL;

 	if (irqs_max < afu->pp_irqs)
 		return -EINVAL;

 	if (irqs_max > afu->adapter->user_irqs)
 		return -EINVAL;

 	afu->irqs_max = irqs_max;
 	return count;
 }

 static ssize_t modes_supported_show(struct device *device,
 				    struct device_attribute *attr, char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);
 	char *p = buf, *end = buf + PAGE_SIZE;

 	if (afu->modes_supported & CXL_MODE_DEDICATED)
 		p += scnprintf(p, end - p, "dedicated_process\n");
 	if (afu->modes_supported & CXL_MODE_DIRECTED)
 		p += scnprintf(p, end - p, "afu_directed\n");
 	return (p - buf);
 }

 static ssize_t prefault_mode_show(struct device *device,
 				  struct device_attribute *attr,
 				  char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);

 	switch (afu->prefault_mode) {
 	case CXL_PREFAULT_WED:
 		return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
 	case CXL_PREFAULT_ALL:
 		return scnprintf(buf, PAGE_SIZE, "all\n");
 	default:
 		return scnprintf(buf, PAGE_SIZE, "none\n");
 	}
 }

 static ssize_t prefault_mode_store(struct device *device,
 			  struct device_attribute *attr,
 			  const char *buf, size_t count)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);
 	enum prefault_modes mode = -1;

 	if (!strncmp(buf, "work_element_descriptor", 23))
 		mode = CXL_PREFAULT_WED;
 	if (!strncmp(buf, "all", 3))
 		mode = CXL_PREFAULT_ALL;
 	if (!strncmp(buf, "none", 4))
 		mode = CXL_PREFAULT_NONE;

 	if (mode == -1)
 		return -EINVAL;

 	afu->prefault_mode = mode;
 	return count;
 }

 static ssize_t mode_show(struct device *device,
 			 struct device_attribute *attr,
 			 char *buf)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);

 	if (afu->current_mode == CXL_MODE_DEDICATED)
 		return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
 	if (afu->current_mode == CXL_MODE_DIRECTED)
 		return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
 	return scnprintf(buf, PAGE_SIZE, "none\n");
 }

 static ssize_t mode_store(struct device *device, struct device_attribute *attr,
 			  const char *buf, size_t count)
 {
 	struct cxl_afu *afu = to_cxl_afu(device);
 	int old_mode, mode = -1;
 	int rc = -EBUSY;

 	/* can't change this if we have a user */
 	mutex_lock(&afu->contexts_lock);
 	if (!idr_is_empty(&afu->contexts_idr))
 		goto err;

 	if (!strncmp(buf, "dedicated_process", 17))
 		mode = CXL_MODE_DEDICATED;
 	if (!strncmp(buf, "afu_directed", 12))
 		mode = CXL_MODE_DIRECTED;
 	if (!strncmp(buf, "none", 4))
 		mode = 0;

 	if (mode == -1) {
 		rc = -EINVAL;
 		goto err;
 	}

 	/*
 	 * cxl_afu_deactivate_mode needs to be done outside the lock, prevent
 	 * other contexts coming in before we are ready:
 	 */
 	old_mode = afu->current_mode;
 	afu->current_mode = 0;
 	afu->num_procs = 0;

 	mutex_unlock(&afu->contexts_lock);

 	if ((rc = _cxl_afu_deactivate_mode(afu, old_mode)))
 		return rc;
 	if ((rc = cxl_afu_activate_mode(afu, mode)))
 		return rc;

 	return count;
 err:
 	mutex_unlock(&afu->contexts_lock);
 	return rc;
 }

 static ssize_t api_version_show(struct device *device,
 				struct device_attribute *attr,
 				char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
 }

 static ssize_t api_version_compatible_show(struct device *device,
 					   struct device_attribute *attr,
 					   char *buf)
 {
 	return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
 }

 static struct device_attribute afu_attrs[] = {
 	__ATTR_RO(mmio_size),
 	__ATTR_RO(irqs_min),
 	__ATTR_RW(irqs_max),
 	__ATTR_RO(modes_supported),
 	__ATTR_RW(mode),
 	__ATTR_RW(prefault_mode),
 	__ATTR_RO(api_version),
 	__ATTR_RO(api_version_compatible),
 	__ATTR(reset, S_IWUSR, NULL, reset_store_afu),
 };


 int cxl_sysfs_adapter_add(struct cxl *adapter)
 {
 	int i, rc;

 	for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
 		if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
 			goto err;
 	}
 	return 0;
 err:
 	for (i--; i >= 0; i--)
 		device_remove_file(&adapter->dev, &adapter_attrs[i]);
 	return rc;
 }
 void cxl_sysfs_adapter_remove(struct cxl *adapter)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
 		device_remove_file(&adapter->dev, &adapter_attrs[i]);
 }

 int cxl_sysfs_afu_add(struct cxl_afu *afu)
 {
 	int i, rc;

 	for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
 		if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
 			goto err;
 	}

 	return 0;

 err:
 	for (i--; i >= 0; i--)
 		device_remove_file(&afu->dev, &afu_attrs[i]);
 	return rc;
 }

 void cxl_sysfs_afu_remove(struct cxl_afu *afu)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
 		device_remove_file(&afu->dev, &afu_attrs[i]);
 }

 int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
 {
 	int i, rc;

 	for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
 		if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
 			goto err;
 	}

 	return 0;

 err:
 	for (i--; i >= 0; i--)
 		device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
 	return rc;
 }

 void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++)
 		device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
 }
	/*
	* Copyright 2014 IBM Corp.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/sysfs.h>

	#include "cxl.h"

	#define to_afu_chardev_m(d) dev_get_drvdata(d)

	/******* Adapter attributes ********************************************/

	static ssize_t caia_version_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl *adapter = to_cxl_adapter(device);

	return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
	adapter->caia_minor);
	}

	static ssize_t psl_revision_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl *adapter = to_cxl_adapter(device);

	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
	}

	static ssize_t base_image_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl *adapter = to_cxl_adapter(device);

	return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
	}

	static ssize_t image_loaded_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl *adapter = to_cxl_adapter(device);

	if (adapter->user_image_loaded)
	return scnprintf(buf, PAGE_SIZE, "user\n");
	return scnprintf(buf, PAGE_SIZE, "factory\n");
	}

	static struct device_attribute adapter_attrs[] = {
	__ATTR_RO(caia_version),
	__ATTR_RO(psl_revision),
	__ATTR_RO(base_image),
	__ATTR_RO(image_loaded),
	};


	/******* AFU master specific attributes ********************************/

	static ssize_t mmio_size_show_master(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_afu_chardev_m(device);

	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
	}

	static ssize_t pp_mmio_off_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_afu_chardev_m(device);

	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_offset);
	}

	static ssize_t pp_mmio_len_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_afu_chardev_m(device);

	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
	}

	static struct device_attribute afu_master_attrs[] = {
	__ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
	__ATTR_RO(pp_mmio_off),
	__ATTR_RO(pp_mmio_len),
	};


	/******* AFU attributes ************************************************/

	static ssize_t mmio_size_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);

	if (afu->pp_size)
	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
	return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
	}

	static ssize_t reset_store_afu(struct device *device,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct cxl_afu *afu = to_cxl_afu(device);
	int rc;

	/* Not safe to reset if it is currently in use */
	mutex_lock(&afu->contexts_lock);
	if (!idr_is_empty(&afu->contexts_idr)) {
	rc = -EBUSY;
	goto err;
	}

	if ((rc = cxl_afu_reset(afu)))
	goto err;

	rc = count;
	err:
	mutex_unlock(&afu->contexts_lock);
	return rc;
	}

	static ssize_t irqs_min_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);

	return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
	}

	static ssize_t irqs_max_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);

	return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
	}

	static ssize_t irqs_max_store(struct device *device,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct cxl_afu *afu = to_cxl_afu(device);
	ssize_t ret;
	int irqs_max;

	ret = sscanf(buf, "%i", &irqs_max);
	if (ret != 1)
	return -EINVAL;

	if (irqs_max < afu->pp_irqs)
	return -EINVAL;

	if (irqs_max > afu->adapter->user_irqs)
	return -EINVAL;

	afu->irqs_max = irqs_max;
	return count;
	}

	static ssize_t modes_supported_show(struct device *device,
	struct device_attribute attr, char buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);
	char p = buf, end = buf + PAGE_SIZE;

	if (afu->modes_supported & CXL_MODE_DEDICATED)
	p += scnprintf(p, end - p, "dedicated_process\n");
	if (afu->modes_supported & CXL_MODE_DIRECTED)
	p += scnprintf(p, end - p, "afu_directed\n");
	return (p - buf);
	}

	static ssize_t prefault_mode_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);

	switch (afu->prefault_mode) {
	case CXL_PREFAULT_WED:
	return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
	case CXL_PREFAULT_ALL:
	return scnprintf(buf, PAGE_SIZE, "all\n");
	default:
	return scnprintf(buf, PAGE_SIZE, "none\n");
	}
	}

	static ssize_t prefault_mode_store(struct device *device,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct cxl_afu *afu = to_cxl_afu(device);
	enum prefault_modes mode = -1;

	if (!strncmp(buf, "work_element_descriptor", 23))
	mode = CXL_PREFAULT_WED;
	if (!strncmp(buf, "all", 3))
	mode = CXL_PREFAULT_ALL;
	if (!strncmp(buf, "none", 4))
	mode = CXL_PREFAULT_NONE;

	if (mode == -1)
	return -EINVAL;

	afu->prefault_mode = mode;
	return count;
	}

	static ssize_t mode_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	struct cxl_afu *afu = to_cxl_afu(device);

	if (afu->current_mode == CXL_MODE_DEDICATED)
	return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
	if (afu->current_mode == CXL_MODE_DIRECTED)
	return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
	return scnprintf(buf, PAGE_SIZE, "none\n");
	}

	static ssize_t mode_store(struct device device, struct device_attribute attr,
	const char *buf, size_t count)
	{
	struct cxl_afu *afu = to_cxl_afu(device);
	int old_mode, mode = -1;
	int rc = -EBUSY;

	/* can't change this if we have a user */
	mutex_lock(&afu->contexts_lock);
	if (!idr_is_empty(&afu->contexts_idr))
	goto err;

	if (!strncmp(buf, "dedicated_process", 17))
	mode = CXL_MODE_DEDICATED;
	if (!strncmp(buf, "afu_directed", 12))
	mode = CXL_MODE_DIRECTED;
	if (!strncmp(buf, "none", 4))
	mode = 0;

	if (mode == -1) {
	rc = -EINVAL;
	goto err;
	}

	/*
	* cxl_afu_deactivate_mode needs to be done outside the lock, prevent
	* other contexts coming in before we are ready:
	*/
	old_mode = afu->current_mode;
	afu->current_mode = 0;
	afu->num_procs = 0;

	mutex_unlock(&afu->contexts_lock);

	if ((rc = _cxl_afu_deactivate_mode(afu, old_mode)))
	return rc;
	if ((rc = cxl_afu_activate_mode(afu, mode)))
	return rc;

	return count;
	err:
	mutex_unlock(&afu->contexts_lock);
	return rc;
	}

	static ssize_t api_version_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
	}

	static ssize_t api_version_compatible_show(struct device *device,
	struct device_attribute *attr,
	char *buf)
	{
	return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
	}

	static struct device_attribute afu_attrs[] = {
	__ATTR_RO(mmio_size),
	__ATTR_RO(irqs_min),
	__ATTR_RW(irqs_max),
	__ATTR_RO(modes_supported),
	__ATTR_RW(mode),
	__ATTR_RW(prefault_mode),
	__ATTR_RO(api_version),
	__ATTR_RO(api_version_compatible),
	__ATTR(reset, S_IWUSR, NULL, reset_store_afu),
	};



	int cxl_sysfs_adapter_add(struct cxl *adapter)
	{
	int i, rc;

	for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
	if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
	goto err;
	}
	return 0;
	err:
	for (i--; i >= 0; i--)
	device_remove_file(&adapter->dev, &adapter_attrs[i]);
	return rc;
	}
	void cxl_sysfs_adapter_remove(struct cxl *adapter)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
	device_remove_file(&adapter->dev, &adapter_attrs[i]);
	}

	int cxl_sysfs_afu_add(struct cxl_afu *afu)
	{
	int i, rc;

	for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
	if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
	goto err;
	}

	return 0;

	err:
	for (i--; i >= 0; i--)
	device_remove_file(&afu->dev, &afu_attrs[i]);
	return rc;
	}

	void cxl_sysfs_afu_remove(struct cxl_afu *afu)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
	device_remove_file(&afu->dev, &afu_attrs[i]);
	}

	int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
	{
	int i, rc;

	for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
	if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
	goto err;
	}

	return 0;

	err:
	for (i--; i >= 0; i--)
	device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
	return rc;
	}

	void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++)
	device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
	}