[linux.git] / drivers / fpga / dfl-fme-pr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for FPGA Management Engine (FME) Partial Reconfiguration
 *
 * Copyright (C) 2017-2018 Intel Corporation, Inc.
 *
 * Authors:
 *   Kang Luwei <[email protected]>
 *   Xiao Guangrong <[email protected]>
 *   Wu Hao <[email protected]>
 *   Joseph Grecco <[email protected]>
 *   Enno Luebbers <[email protected]>
 *   Tim Whisonant <[email protected]>
 *   Ananda Ravuri <[email protected]>
 *   Christopher Rauer <[email protected]>
 *   Henry Mitchel <[email protected]>
 */

#include <linux/types.h>
#include <linux/device.h>
#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/fpga/fpga-bridge.h>
#include <linux/fpga/fpga-region.h>
#include <linux/fpga-dfl.h>

#include "dfl.h"
#include "dfl-fme.h"
#include "dfl-fme-pr.h"

static struct dfl_fme_region *
dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id)
{
	struct dfl_fme_region *fme_region;

	list_for_each_entry(fme_region, &fme->region_list, node)
		if (fme_region->port_id == port_id)
			return fme_region;

	return NULL;
}

static int dfl_fme_region_match(struct device *dev, const void *data)
{
	return dev->parent == data;
}

static struct fpga_region *dfl_fme_region_find(struct dfl_fme *fme, int port_id)
{
	struct dfl_fme_region *fme_region;
	struct fpga_region *region;

	fme_region = dfl_fme_region_find_by_port_id(fme, port_id);
	if (!fme_region)
		return NULL;

	region = fpga_region_class_find(NULL, &fme_region->region->dev,
					dfl_fme_region_match);
	if (!region)
		return NULL;

	return region;
}

static int fme_pr(struct platform_device *pdev, unsigned long arg)
{
	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
	void __user *argp = (void __user *)arg;
	struct dfl_fpga_fme_port_pr port_pr;
	struct fpga_image_info *info;
	struct fpga_region *region;
	void __iomem *fme_hdr;
	struct dfl_fme *fme;
	unsigned long minsz;
	void *buf = NULL;
	int ret = 0;
	u64 v;

	minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address);

	if (copy_from_user(&port_pr, argp, minsz))
		return -EFAULT;

	if (port_pr.argsz < minsz || port_pr.flags)
		return -EINVAL;

	if (!IS_ALIGNED(port_pr.buffer_size, 4))
		return -EINVAL;

	/* get fme header region */
	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
					       FME_FEATURE_ID_HEADER);

	/* check port id */
	v = readq(fme_hdr + FME_HDR_CAP);
	if (port_pr.port_id >= FIELD_GET(FME_CAP_NUM_PORTS, v)) {
		dev_dbg(&pdev->dev, "port number more than maximum\n");
		return -EINVAL;
	}

	if (!access_ok(VERIFY_READ,
		       (void __user *)(unsigned long)port_pr.buffer_address,
		       port_pr.buffer_size))
		return -EFAULT;

	buf = vmalloc(port_pr.buffer_size);
	if (!buf)
		return -ENOMEM;

	if (copy_from_user(buf,
			   (void __user *)(unsigned long)port_pr.buffer_address,
			   port_pr.buffer_size)) {
		ret = -EFAULT;
		goto free_exit;
	}

	/* prepare fpga_image_info for PR */
	info = fpga_image_info_alloc(&pdev->dev);
	if (!info) {
		ret = -ENOMEM;
		goto free_exit;
	}

	info->flags |= FPGA_MGR_PARTIAL_RECONFIG;

	mutex_lock(&pdata->lock);
	fme = dfl_fpga_pdata_get_private(pdata);
	/* fme device has been unregistered. */
	if (!fme) {
		ret = -EINVAL;
		goto unlock_exit;
	}

	region = dfl_fme_region_find(fme, port_pr.port_id);
	if (!region) {
		ret = -EINVAL;
		goto unlock_exit;
	}

	fpga_image_info_free(region->info);

	info->buf = buf;
	info->count = port_pr.buffer_size;
	info->region_id = port_pr.port_id;
	region->info = info;

	ret = fpga_region_program_fpga(region);

	/*
	 * it allows userspace to reset the PR region's logic by disabling and
	 * reenabling the bridge to clear things out between accleration runs.
	 * so no need to hold the bridges after partial reconfiguration.
	 */
	if (region->get_bridges)
		fpga_bridges_put(&region->bridge_list);

	put_device(&region->dev);
unlock_exit:
	mutex_unlock(&pdata->lock);
free_exit:
	vfree(buf);
	if (copy_to_user((void __user *)arg, &port_pr, minsz))
		return -EFAULT;

	return ret;
}

/**
 * dfl_fme_create_mgr - create fpga mgr platform device as child device
 *
 * @pdata: fme platform_device's pdata
 *
 * Return: mgr platform device if successful, and error code otherwise.
 */
static struct platform_device *
dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
		   struct dfl_feature *feature)
{
	struct platform_device *mgr, *fme = pdata->dev;
	struct dfl_fme_mgr_pdata mgr_pdata;
	int ret = -ENOMEM;

	if (!feature->ioaddr)
		return ERR_PTR(-ENODEV);

	mgr_pdata.ioaddr = feature->ioaddr;

	/*
	 * Each FME has only one fpga-mgr, so allocate platform device using
	 * the same FME platform device id.
	 */
	mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
	if (!mgr)
		return ERR_PTR(ret);

	mgr->dev.parent = &fme->dev;

	ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
	if (ret)
		goto create_mgr_err;

	ret = platform_device_add(mgr);
	if (ret)
		goto create_mgr_err;

	return mgr;

create_mgr_err:
	platform_device_put(mgr);
	return ERR_PTR(ret);
}

/**
 * dfl_fme_destroy_mgr - destroy fpga mgr platform device
 * @pdata: fme platform device's pdata
 */
static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
{
	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);

	platform_device_unregister(priv->mgr);
}

/**
 * dfl_fme_create_bridge - create fme fpga bridge platform device as child
 *
 * @pdata: fme platform device's pdata
 * @port_id: port id for the bridge to be created.
 *
 * Return: bridge platform device if successful, and error code otherwise.
 */
static struct dfl_fme_bridge *
dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
{
	struct device *dev = &pdata->dev->dev;
	struct dfl_fme_br_pdata br_pdata;
	struct dfl_fme_bridge *fme_br;
	int ret = -ENOMEM;

	fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
	if (!fme_br)
		return ERR_PTR(ret);

	br_pdata.cdev = pdata->dfl_cdev;
	br_pdata.port_id = port_id;

	fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
					   PLATFORM_DEVID_AUTO);
	if (!fme_br->br)
		return ERR_PTR(ret);

	fme_br->br->dev.parent = dev;

	ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
	if (ret)
		goto create_br_err;

	ret = platform_device_add(fme_br->br);
	if (ret)
		goto create_br_err;

	return fme_br;

create_br_err:
	platform_device_put(fme_br->br);
	return ERR_PTR(ret);
}

/**
 * dfl_fme_destroy_bridge - destroy fpga bridge platform device
 * @fme_br: fme bridge to destroy
 */
static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
{
	platform_device_unregister(fme_br->br);
}

/**
 * dfl_fme_destroy_bridge - destroy all fpga bridge platform device
 * @pdata: fme platform device's pdata
 */
static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
{
	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
	struct dfl_fme_bridge *fbridge, *tmp;

	list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
		list_del(&fbridge->node);
		dfl_fme_destroy_bridge(fbridge);
	}
}

/**
 * dfl_fme_create_region - create fpga region platform device as child
 *
 * @pdata: fme platform device's pdata
 * @mgr: mgr platform device needed for region
 * @br: br platform device needed for region
 * @port_id: port id
 *
 * Return: fme region if successful, and error code otherwise.
 */
static struct dfl_fme_region *
dfl_fme_create_region(struct dfl_feature_platform_data *pdata,
		      struct platform_device *mgr,
		      struct platform_device *br, int port_id)
{
	struct dfl_fme_region_pdata region_pdata;
	struct device *dev = &pdata->dev->dev;
	struct dfl_fme_region *fme_region;
	int ret = -ENOMEM;

	fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
	if (!fme_region)
		return ERR_PTR(ret);

	region_pdata.mgr = mgr;
	region_pdata.br = br;

	/*
	 * Each FPGA device may have more than one port, so allocate platform
	 * device using the same port platform device id.
	 */
	fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
	if (!fme_region->region)
		return ERR_PTR(ret);

	fme_region->region->dev.parent = dev;

	ret = platform_device_add_data(fme_region->region, &region_pdata,
				       sizeof(region_pdata));
	if (ret)
		goto create_region_err;

	ret = platform_device_add(fme_region->region);
	if (ret)
		goto create_region_err;

	fme_region->port_id = port_id;

	return fme_region;

create_region_err:
	platform_device_put(fme_region->region);
	return ERR_PTR(ret);
}

/**
 * dfl_fme_destroy_region - destroy fme region
 * @fme_region: fme region to destroy
 */
static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
{
	platform_device_unregister(fme_region->region);
}

/**
 * dfl_fme_destroy_regions - destroy all fme regions
 * @pdata: fme platform device's pdata
 */
static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
{
	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
	struct dfl_fme_region *fme_region, *tmp;

	list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) {
		list_del(&fme_region->node);
		dfl_fme_destroy_region(fme_region);
	}
}

static int pr_mgmt_init(struct platform_device *pdev,
			struct dfl_feature *feature)
{
	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct dfl_fme_region *fme_region;
	struct dfl_fme_bridge *fme_br;
	struct platform_device *mgr;
	struct dfl_fme *priv;
	void __iomem *fme_hdr;
	int ret = -ENODEV, i = 0;
	u64 fme_cap, port_offset;

	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
					       FME_FEATURE_ID_HEADER);

	mutex_lock(&pdata->lock);
	priv = dfl_fpga_pdata_get_private(pdata);

	/* Initialize the region and bridge sub device list */
	INIT_LIST_HEAD(&priv->region_list);
	INIT_LIST_HEAD(&priv->bridge_list);

	/* Create fpga mgr platform device */
	mgr = dfl_fme_create_mgr(pdata, feature);
	if (IS_ERR(mgr)) {
		dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
		goto unlock;
	}

	priv->mgr = mgr;

	/* Read capability register to check number of regions and bridges */
	fme_cap = readq(fme_hdr + FME_HDR_CAP);
	for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) {
		port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i));
		if (!(port_offset & FME_PORT_OFST_IMP))
			continue;

		/* Create bridge for each port */
		fme_br = dfl_fme_create_bridge(pdata, i);
		if (IS_ERR(fme_br)) {
			ret = PTR_ERR(fme_br);
			goto destroy_region;
		}

		list_add(&fme_br->node, &priv->bridge_list);

		/* Create region for each port */
		fme_region = dfl_fme_create_region(pdata, mgr,
						   fme_br->br, i);
		if (IS_ERR(fme_region)) {
			ret = PTR_ERR(fme_region);
			goto destroy_region;
		}

		list_add(&fme_region->node, &priv->region_list);
	}
	mutex_unlock(&pdata->lock);

	return 0;

destroy_region:
	dfl_fme_destroy_regions(pdata);
	dfl_fme_destroy_bridges(pdata);
	dfl_fme_destroy_mgr(pdata);
unlock:
	mutex_unlock(&pdata->lock);
	return ret;
}

static void pr_mgmt_uinit(struct platform_device *pdev,
			  struct dfl_feature *feature)
{
	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
	struct dfl_fme *priv;

	mutex_lock(&pdata->lock);
	priv = dfl_fpga_pdata_get_private(pdata);

	dfl_fme_destroy_regions(pdata);
	dfl_fme_destroy_bridges(pdata);
	dfl_fme_destroy_mgr(pdata);
	mutex_unlock(&pdata->lock);
}

static long fme_pr_ioctl(struct platform_device *pdev,
			 struct dfl_feature *feature,
			 unsigned int cmd, unsigned long arg)
{
	long ret;

	switch (cmd) {
	case DFL_FPGA_FME_PORT_PR:
		ret = fme_pr(pdev, arg);
		break;
	default:
		ret = -ENODEV;
	}

	return ret;
}

const struct dfl_feature_ops pr_mgmt_ops = {
	.init = pr_mgmt_init,
	.uinit = pr_mgmt_uinit,
	.ioctl = fme_pr_ioctl,
};
Commit	Line	Data
29de7624 KL	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Driver for FPGA Management Engine (FME) Partial Reconfiguration
	4	*
	5	* Copyright (C) 2017-2018 Intel Corporation, Inc.
	6	*
	7	* Authors:
	8	* Kang Luwei <[email protected]>
	9	* Xiao Guangrong <[email protected]>
	10	* Wu Hao <[email protected]>
	11	* Joseph Grecco <[email protected]>
	12	* Enno Luebbers <[email protected]>
	13	* Tim Whisonant <[email protected]>
	14	* Ananda Ravuri <[email protected]>
	15	* Christopher Rauer <[email protected]>
	16	* Henry Mitchel <[email protected]>
	17	*/
	18
	19	#include <linux/types.h>
	20	#include <linux/device.h>
	21	#include <linux/vmalloc.h>
	22	#include <linux/uaccess.h>
	23	#include <linux/fpga/fpga-mgr.h>
	24	#include <linux/fpga/fpga-bridge.h>
	25	#include <linux/fpga/fpga-region.h>
	26	#include <linux/fpga-dfl.h>
	27
	28	#include "dfl.h"
	29	#include "dfl-fme.h"
	30	#include "dfl-fme-pr.h"
	31
	32	static struct dfl_fme_region *
	33	dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id)
	34	{
	35	struct dfl_fme_region *fme_region;
	36
	37	list_for_each_entry(fme_region, &fme->region_list, node)
	38	if (fme_region->port_id == port_id)
	39	return fme_region;
	40
	41	return NULL;
	42	}
	43
	44	static int dfl_fme_region_match(struct device dev, const void data)
	45	{
	46	return dev->parent == data;
	47	}
	48
	49	static struct fpga_region dfl_fme_region_find(struct dfl_fme fme, int port_id)
	50	{
	51	struct dfl_fme_region *fme_region;
	52	struct fpga_region *region;
	53
	54	fme_region = dfl_fme_region_find_by_port_id(fme, port_id);
	55	if (!fme_region)
	56	return NULL;
	57
	58	region = fpga_region_class_find(NULL, &fme_region->region->dev,
	59	dfl_fme_region_match);
	60	if (!region)
	61	return NULL;
	62
	63	return region;
	64	}
65
66	static int fme_pr(struct platform_device *pdev, unsigned long arg)
67	{
68	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
69	void __user argp = (void __user )arg;
70	struct dfl_fpga_fme_port_pr port_pr;
71	struct fpga_image_info *info;
72	struct fpga_region *region;
73	void __iomem *fme_hdr;
74	struct dfl_fme *fme;
75	unsigned long minsz;
76	void *buf = NULL;
77	int ret = 0;
78	u64 v;
79
80	minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address);
81
82	if (copy_from_user(&port_pr, argp, minsz))
83	return -EFAULT;
84
85	if (port_pr.argsz < minsz \|\| port_pr.flags)
86	return -EINVAL;
87
88	if (!IS_ALIGNED(port_pr.buffer_size, 4))
89	return -EINVAL;
90
91	/* get fme header region */
92	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
93	FME_FEATURE_ID_HEADER);
94
95	/* check port id */
96	v = readq(fme_hdr + FME_HDR_CAP);
97	if (port_pr.port_id >= FIELD_GET(FME_CAP_NUM_PORTS, v)) {
98	dev_dbg(&pdev->dev, "port number more than maximum\n");
99	return -EINVAL;
100	}
101
102	if (!access_ok(VERIFY_READ,
103	(void __user *)(unsigned long)port_pr.buffer_address,
104	port_pr.buffer_size))
105	return -EFAULT;
106
107	buf = vmalloc(port_pr.buffer_size);
108	if (!buf)
109	return -ENOMEM;
110
111	if (copy_from_user(buf,
112	(void __user *)(unsigned long)port_pr.buffer_address,
113	port_pr.buffer_size)) {
114	ret = -EFAULT;
115	goto free_exit;
116	}
117
118	/* prepare fpga_image_info for PR */
119	info = fpga_image_info_alloc(&pdev->dev);
120	if (!info) {
121	ret = -ENOMEM;
122	goto free_exit;
123	}
124
125	info->flags \|= FPGA_MGR_PARTIAL_RECONFIG;
126
127	mutex_lock(&pdata->lock);
128	fme = dfl_fpga_pdata_get_private(pdata);
129	/* fme device has been unregistered. */
130	if (!fme) {
131	ret = -EINVAL;
132	goto unlock_exit;
133	}
134
135	region = dfl_fme_region_find(fme, port_pr.port_id);
136	if (!region) {
137	ret = -EINVAL;
138	goto unlock_exit;
139	}
140
141	fpga_image_info_free(region->info);
142
143	info->buf = buf;
144	info->count = port_pr.buffer_size;
145	info->region_id = port_pr.port_id;
146	region->info = info;
147
148	ret = fpga_region_program_fpga(region);
149
150	/*
151	* it allows userspace to reset the PR region's logic by disabling and
152	* reenabling the bridge to clear things out between accleration runs.
153	* so no need to hold the bridges after partial reconfiguration.
154	*/
155	if (region->get_bridges)
156	fpga_bridges_put(&region->bridge_list);
157
158	put_device(&region->dev);
159	unlock_exit:
160	mutex_unlock(&pdata->lock);
161	free_exit:
162	vfree(buf);
163	if (copy_to_user((void __user *)arg, &port_pr, minsz))
164	return -EFAULT;
165
166	return ret;
167	}
168
169	/**
170	* dfl_fme_create_mgr - create fpga mgr platform device as child device
171	*
172	* @pdata: fme platform_device's pdata
173	*
174	* Return: mgr platform device if successful, and error code otherwise.
175	*/
176	static struct platform_device *
177	dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
178	struct dfl_feature *feature)
179	{
180	struct platform_device mgr, fme = pdata->dev;
181	struct dfl_fme_mgr_pdata mgr_pdata;
182	int ret = -ENOMEM;
183
184	if (!feature->ioaddr)
185	return ERR_PTR(-ENODEV);
186
187	mgr_pdata.ioaddr = feature->ioaddr;
188
189	/*
190	* Each FME has only one fpga-mgr, so allocate platform device using
191	* the same FME platform device id.
192	*/
193	mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
194	if (!mgr)
195	return ERR_PTR(ret);
196
197	mgr->dev.parent = &fme->dev;
198
199	ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
200	if (ret)
201	goto create_mgr_err;
202
203	ret = platform_device_add(mgr);
204	if (ret)
205	goto create_mgr_err;
206
207	return mgr;
208
209	create_mgr_err:
210	platform_device_put(mgr);
211	return ERR_PTR(ret);
212	}
213
214	/**
215	* dfl_fme_destroy_mgr - destroy fpga mgr platform device
216	* @pdata: fme platform device's pdata
217	*/
218	static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
219	{
220	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
221
222	platform_device_unregister(priv->mgr);
223	}
224
225	/**
226	* dfl_fme_create_bridge - create fme fpga bridge platform device as child
227	*
228	* @pdata: fme platform device's pdata
229	* @port_id: port id for the bridge to be created.
230	*
231	* Return: bridge platform device if successful, and error code otherwise.
232	*/
233	static struct dfl_fme_bridge *
234	dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
235	{
236	struct device *dev = &pdata->dev->dev;
237	struct dfl_fme_br_pdata br_pdata;
238	struct dfl_fme_bridge *fme_br;
239	int ret = -ENOMEM;
240
241	fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
242	if (!fme_br)
243	return ERR_PTR(ret);
244
245	br_pdata.cdev = pdata->dfl_cdev;
246	br_pdata.port_id = port_id;
247
248	fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
249	PLATFORM_DEVID_AUTO);
250	if (!fme_br->br)
251	return ERR_PTR(ret);
252
253	fme_br->br->dev.parent = dev;
254
255	ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
256	if (ret)
257	goto create_br_err;
258
259	ret = platform_device_add(fme_br->br);
260	if (ret)
261	goto create_br_err;
262
263	return fme_br;
264
265	create_br_err:
266	platform_device_put(fme_br->br);
267	return ERR_PTR(ret);
268	}
269
270	/**
271	* dfl_fme_destroy_bridge - destroy fpga bridge platform device
272	* @fme_br: fme bridge to destroy
273	*/
274	static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
275	{
276	platform_device_unregister(fme_br->br);
277	}
278
279	/**
280	* dfl_fme_destroy_bridge - destroy all fpga bridge platform device
281	* @pdata: fme platform device's pdata
282	*/
283	static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
284	{
285	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
286	struct dfl_fme_bridge fbridge, tmp;
287
288	list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
289	list_del(&fbridge->node);
290	dfl_fme_destroy_bridge(fbridge);
291	}
292	}
293
294	/**
295	* dfl_fme_create_region - create fpga region platform device as child
296	*
297	* @pdata: fme platform device's pdata
298	* @mgr: mgr platform device needed for region
299	* @br: br platform device needed for region
300	* @port_id: port id
301	*
302	* Return: fme region if successful, and error code otherwise.
303	*/
304	static struct dfl_fme_region *
305	dfl_fme_create_region(struct dfl_feature_platform_data *pdata,
306	struct platform_device *mgr,
307	struct platform_device *br, int port_id)
308	{
309	struct dfl_fme_region_pdata region_pdata;
310	struct device *dev = &pdata->dev->dev;
311	struct dfl_fme_region *fme_region;
312	int ret = -ENOMEM;
313
314	fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
315	if (!fme_region)
316	return ERR_PTR(ret);
317
318	region_pdata.mgr = mgr;
319	region_pdata.br = br;
320
321	/*
322	* Each FPGA device may have more than one port, so allocate platform
323	* device using the same port platform device id.
324	*/
325	fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
326	if (!fme_region->region)
327	return ERR_PTR(ret);
328
329	fme_region->region->dev.parent = dev;
330
331	ret = platform_device_add_data(fme_region->region, &region_pdata,
332	sizeof(region_pdata));
333	if (ret)
334	goto create_region_err;
335
336	ret = platform_device_add(fme_region->region);
337	if (ret)
338	goto create_region_err;
339
340	fme_region->port_id = port_id;
341
342	return fme_region;
343
344	create_region_err:
345	platform_device_put(fme_region->region);
346	return ERR_PTR(ret);
347	}
348
349	/**
350	* dfl_fme_destroy_region - destroy fme region
351	* @fme_region: fme region to destroy
352	*/
353	static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
354	{
355	platform_device_unregister(fme_region->region);
356	}
357
358	/**
359	* dfl_fme_destroy_regions - destroy all fme regions
360	* @pdata: fme platform device's pdata
361	*/
362	static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
363	{
364	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
365	struct dfl_fme_region fme_region, tmp;
366
367	list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) {
368	list_del(&fme_region->node);
369	dfl_fme_destroy_region(fme_region);
370	}
371	}
372
373	static int pr_mgmt_init(struct platform_device *pdev,
374	struct dfl_feature *feature)
375	{
376	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
377	struct dfl_fme_region *fme_region;
378	struct dfl_fme_bridge *fme_br;
379	struct platform_device *mgr;
380	struct dfl_fme *priv;
381	void __iomem *fme_hdr;
382	int ret = -ENODEV, i = 0;
383	u64 fme_cap, port_offset;
384
385	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
386	FME_FEATURE_ID_HEADER);
387
388	mutex_lock(&pdata->lock);
389	priv = dfl_fpga_pdata_get_private(pdata);
390
391	/* Initialize the region and bridge sub device list */
392	INIT_LIST_HEAD(&priv->region_list);
393	INIT_LIST_HEAD(&priv->bridge_list);
394
395	/* Create fpga mgr platform device */
396	mgr = dfl_fme_create_mgr(pdata, feature);
397	if (IS_ERR(mgr)) {
398	dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
399	goto unlock;
400	}
401
402	priv->mgr = mgr;
403
404	/* Read capability register to check number of regions and bridges */
405	fme_cap = readq(fme_hdr + FME_HDR_CAP);
406	for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) {
407	port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i));
408	if (!(port_offset & FME_PORT_OFST_IMP))
409	continue;
410
411	/* Create bridge for each port */
412	fme_br = dfl_fme_create_bridge(pdata, i);
413	if (IS_ERR(fme_br)) {
414	ret = PTR_ERR(fme_br);
415	goto destroy_region;
416	}
417
418	list_add(&fme_br->node, &priv->bridge_list);
419
420	/* Create region for each port */
421	fme_region = dfl_fme_create_region(pdata, mgr,
422	fme_br->br, i);
029d727b	423	if (IS_ERR(fme_region)) {
29de7624 KL	424	ret = PTR_ERR(fme_region);
	425	goto destroy_region;
	426	}
	427
	428	list_add(&fme_region->node, &priv->region_list);
	429	}
	430	mutex_unlock(&pdata->lock);
	431
	432	return 0;
	433
	434	destroy_region:
	435	dfl_fme_destroy_regions(pdata);
	436	dfl_fme_destroy_bridges(pdata);
	437	dfl_fme_destroy_mgr(pdata);
	438	unlock:
	439	mutex_unlock(&pdata->lock);
	440	return ret;
	441	}
	442
	443	static void pr_mgmt_uinit(struct platform_device *pdev,
	444	struct dfl_feature *feature)
	445	{
	446	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
	447	struct dfl_fme *priv;
	448
	449	mutex_lock(&pdata->lock);
	450	priv = dfl_fpga_pdata_get_private(pdata);
	451
	452	dfl_fme_destroy_regions(pdata);
	453	dfl_fme_destroy_bridges(pdata);
	454	dfl_fme_destroy_mgr(pdata);
	455	mutex_unlock(&pdata->lock);
	456	}
	457
	458	static long fme_pr_ioctl(struct platform_device *pdev,
	459	struct dfl_feature *feature,
	460	unsigned int cmd, unsigned long arg)
	461	{
	462	long ret;
	463
	464	switch (cmd) {
	465	case DFL_FPGA_FME_PORT_PR:
	466	ret = fme_pr(pdev, arg);
	467	break;
	468	default:
	469	ret = -ENODEV;
	470	}
	471
	472	return ret;
	473	}
	474
	475	const struct dfl_feature_ops pr_mgmt_ops = {
	476	.init = pr_mgmt_init,
	477	.uinit = pr_mgmt_uinit,
	478	.ioctl = fme_pr_ioctl,
	479	};