[linux.git] / drivers / net / ethernet / mellanox / mlx5 / core / pagealloc.c

/*
 * Copyright (c) 2013, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <asm-generic/kmap_types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/cmd.h>
#include "mlx5_core.h"

enum {
	MLX5_PAGES_CANT_GIVE	= 0,
	MLX5_PAGES_GIVE		= 1,
	MLX5_PAGES_TAKE		= 2
};

struct mlx5_pages_req {
	struct mlx5_core_dev *dev;
	u32	func_id;
	s16	npages;
	struct work_struct work;
};

struct fw_page {
	struct rb_node	rb_node;
	u64		addr;
	struct page	*page;
	u16		func_id;
};

struct mlx5_query_pages_inbox {
	struct mlx5_inbox_hdr	hdr;
	u8			rsvd[8];
};

struct mlx5_query_pages_outbox {
	struct mlx5_outbox_hdr	hdr;
	u8			reserved[2];
	__be16			func_id;
	__be16			init_pages;
	__be16			num_pages;
};

struct mlx5_manage_pages_inbox {
	struct mlx5_inbox_hdr	hdr;
	__be16			rsvd0;
	__be16			func_id;
	__be16			rsvd1;
	__be16			num_entries;
	u8			rsvd2[16];
	__be64			pas[0];
};

struct mlx5_manage_pages_outbox {
	struct mlx5_outbox_hdr	hdr;
	u8			rsvd0[2];
	__be16			num_entries;
	u8			rsvd1[20];
	__be64			pas[0];
};

static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
{
	struct rb_root *root = &dev->priv.page_root;
	struct rb_node **new = &root->rb_node;
	struct rb_node *parent = NULL;
	struct fw_page *nfp;
	struct fw_page *tfp;

	while (*new) {
		parent = *new;
		tfp = rb_entry(parent, struct fw_page, rb_node);
		if (tfp->addr < addr)
			new = &parent->rb_left;
		else if (tfp->addr > addr)
			new = &parent->rb_right;
		else
			return -EEXIST;
	}

	nfp = kmalloc(sizeof(*nfp), GFP_KERNEL);
	if (!nfp)
		return -ENOMEM;

	nfp->addr = addr;
	nfp->page = page;
	nfp->func_id = func_id;

	rb_link_node(&nfp->rb_node, parent, new);
	rb_insert_color(&nfp->rb_node, root);

	return 0;
}

static struct page *remove_page(struct mlx5_core_dev *dev, u64 addr)
{
	struct rb_root *root = &dev->priv.page_root;
	struct rb_node *tmp = root->rb_node;
	struct page *result = NULL;
	struct fw_page *tfp;

	while (tmp) {
		tfp = rb_entry(tmp, struct fw_page, rb_node);
		if (tfp->addr < addr) {
			tmp = tmp->rb_left;
		} else if (tfp->addr > addr) {
			tmp = tmp->rb_right;
		} else {
			rb_erase(&tfp->rb_node, root);
			result = tfp->page;
			kfree(tfp);
			break;
		}
	}

	return result;
}

static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
				s16 *pages, s16 *init_pages)
{
	struct mlx5_query_pages_inbox	in;
	struct mlx5_query_pages_outbox	out;
	int err;

	memset(&in, 0, sizeof(in));
	memset(&out, 0, sizeof(out));
	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
	if (err)
		return err;

	if (out.hdr.status)
		return mlx5_cmd_status_to_err(&out.hdr);

	if (pages)
		*pages = be16_to_cpu(out.num_pages);
	if (init_pages)
		*init_pages = be16_to_cpu(out.init_pages);
	*func_id = be16_to_cpu(out.func_id);

	return err;
}

static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
		      int notify_fail)
{
	struct mlx5_manage_pages_inbox *in;
	struct mlx5_manage_pages_outbox out;
	struct page *page;
	int inlen;
	u64 addr;
	int err;
	int i;

	inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
	in = mlx5_vzalloc(inlen);
	if (!in) {
		mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
		return -ENOMEM;
	}
	memset(&out, 0, sizeof(out));

	for (i = 0; i < npages; i++) {
		page = alloc_page(GFP_HIGHUSER);
		if (!page) {
			err = -ENOMEM;
			mlx5_core_warn(dev, "failed to allocate page\n");
			goto out_alloc;
		}
		addr = dma_map_page(&dev->pdev->dev, page, 0,
				    PAGE_SIZE, DMA_BIDIRECTIONAL);
		if (dma_mapping_error(&dev->pdev->dev, addr)) {
			mlx5_core_warn(dev, "failed dma mapping page\n");
			__free_page(page);
			err = -ENOMEM;
			goto out_alloc;
		}
		err = insert_page(dev, addr, page, func_id);
		if (err) {
			mlx5_core_err(dev, "failed to track allocated page\n");
			dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
			__free_page(page);
			err = -ENOMEM;
			goto out_alloc;
		}
		in->pas[i] = cpu_to_be64(addr);
	}

	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
	in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
	in->func_id = cpu_to_be16(func_id);
	in->num_entries = cpu_to_be16(npages);
	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
	mlx5_core_dbg(dev, "err %d\n", err);
	if (err) {
		mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
		goto out_alloc;
	}
	dev->priv.fw_pages += npages;

	if (out.hdr.status) {
		err = mlx5_cmd_status_to_err(&out.hdr);
		if (err) {
			mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n", func_id, npages, out.hdr.status);
			goto out_alloc;
		}
	}

	mlx5_core_dbg(dev, "err %d\n", err);

	goto out_free;

out_alloc:
	if (notify_fail) {
		memset(in, 0, inlen);
		memset(&out, 0, sizeof(out));
		in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
		in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
		if (mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out)))
			mlx5_core_warn(dev, "\n");
	}
	for (i--; i >= 0; i--) {
		addr = be64_to_cpu(in->pas[i]);
		page = remove_page(dev, addr);
		if (!page) {
			mlx5_core_err(dev, "BUG: can't remove page at addr 0x%llx\n",
				      addr);
			continue;
		}
		dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
		__free_page(page);
	}

out_free:
	mlx5_vfree(in);
	return err;
}

static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
			 int *nclaimed)
{
	struct mlx5_manage_pages_inbox   in;
	struct mlx5_manage_pages_outbox *out;
	struct page *page;
	int num_claimed;
	int outlen;
	u64 addr;
	int err;
	int i;

	memset(&in, 0, sizeof(in));
	outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
	out = mlx5_vzalloc(outlen);
	if (!out)
		return -ENOMEM;

	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
	in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
	in.func_id = cpu_to_be16(func_id);
	in.num_entries = cpu_to_be16(npages);
	mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
	err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
	if (err) {
		mlx5_core_err(dev, "failed recliaming pages\n");
		goto out_free;
	}
	dev->priv.fw_pages -= npages;

	if (out->hdr.status) {
		err = mlx5_cmd_status_to_err(&out->hdr);
		goto out_free;
	}

	num_claimed = be16_to_cpu(out->num_entries);
	if (nclaimed)
		*nclaimed = num_claimed;

	for (i = 0; i < num_claimed; i++) {
		addr = be64_to_cpu(out->pas[i]);
		page = remove_page(dev, addr);
		if (!page) {
			mlx5_core_warn(dev, "FW reported unknown DMA address 0x%llx\n", addr);
		} else {
			dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
			__free_page(page);
		}
	}

out_free:
	mlx5_vfree(out);
	return err;
}

static void pages_work_handler(struct work_struct *work)
{
	struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
	struct mlx5_core_dev *dev = req->dev;
	int err = 0;

	if (req->npages < 0)
		err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
	else if (req->npages > 0)
		err = give_pages(dev, req->func_id, req->npages, 1);

	if (err)
		mlx5_core_warn(dev, "%s fail %d\n", req->npages < 0 ?
			       "reclaim" : "give", err);

	kfree(req);
}

void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
				 s16 npages)
{
	struct mlx5_pages_req *req;

	req = kzalloc(sizeof(*req), GFP_ATOMIC);
	if (!req) {
		mlx5_core_warn(dev, "failed to allocate pages request\n");
		return;
	}

	req->dev = dev;
	req->func_id = func_id;
	req->npages = npages;
	INIT_WORK(&req->work, pages_work_handler);
	queue_work(dev->priv.pg_wq, &req->work);
}

int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev)
{
	s16 uninitialized_var(init_pages);
	u16 uninitialized_var(func_id);
	int err;

	err = mlx5_cmd_query_pages(dev, &func_id, NULL, &init_pages);
	if (err)
		return err;

	mlx5_core_dbg(dev, "requested %d init pages for func_id 0x%x\n", init_pages, func_id);

	return give_pages(dev, func_id, init_pages, 0);
}

static int optimal_reclaimed_pages(void)
{
	struct mlx5_cmd_prot_block *block;
	struct mlx5_cmd_layout *lay;
	int ret;

	ret = (sizeof(lay->in) + sizeof(block->data) -
	       sizeof(struct mlx5_manage_pages_outbox)) / 8;

	return ret;
}

int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
{
	unsigned long end = jiffies + msecs_to_jiffies(5000);
	struct fw_page *fwp;
	struct rb_node *p;
	int err;

	do {
		p = rb_first(&dev->priv.page_root);
		if (p) {
			fwp = rb_entry(p, struct fw_page, rb_node);
			err = reclaim_pages(dev, fwp->func_id, optimal_reclaimed_pages(), NULL);
			if (err) {
				mlx5_core_warn(dev, "failed reclaiming pages (%d)\n", err);
				return err;
			}
		}
		if (time_after(jiffies, end)) {
			mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
			break;
		}
	} while (p);

	return 0;
}

void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
{
	dev->priv.page_root = RB_ROOT;
}

void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
{
	/* nothing */
}

int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
{
	dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
	if (!dev->priv.pg_wq)
		return -ENOMEM;

	return 0;
}

void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
{
	destroy_workqueue(dev->priv.pg_wq);
}
Commit	Line	Data
e126ba97 EC	1	/*
	2	* Copyright (c) 2013, Mellanox Technologies inc. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#include <asm-generic/kmap_types.h>
	34	#include <linux/kernel.h>
	35	#include <linux/module.h>
	36	#include <linux/mlx5/driver.h>
	37	#include <linux/mlx5/cmd.h>
	38	#include "mlx5_core.h"
	39
	40	enum {
	41	MLX5_PAGES_CANT_GIVE = 0,
	42	MLX5_PAGES_GIVE = 1,
	43	MLX5_PAGES_TAKE = 2
	44	};
	45
	46	struct mlx5_pages_req {
	47	struct mlx5_core_dev *dev;
	48	u32 func_id;
	49	s16 npages;
	50	struct work_struct work;
	51	};
	52
	53	struct fw_page {
	54	struct rb_node rb_node;
	55	u64 addr;
	56	struct page *page;
	57	u16 func_id;
	58	};
	59
	60	struct mlx5_query_pages_inbox {
	61	struct mlx5_inbox_hdr hdr;
	62	u8 rsvd[8];
	63	};
	64
65	struct mlx5_query_pages_outbox {
66	struct mlx5_outbox_hdr hdr;
67	u8 reserved[2];
68	__be16 func_id;
69	__be16 init_pages;
70	__be16 num_pages;
71	};
72
73	struct mlx5_manage_pages_inbox {
74	struct mlx5_inbox_hdr hdr;
75	__be16 rsvd0;
76	__be16 func_id;
77	__be16 rsvd1;
78	__be16 num_entries;
79	u8 rsvd2[16];
80	__be64 pas[0];
81	};
82
83	struct mlx5_manage_pages_outbox {
84	struct mlx5_outbox_hdr hdr;
85	u8 rsvd0[2];
86	__be16 num_entries;
87	u8 rsvd1[20];
88	__be64 pas[0];
89	};
90
91	static int insert_page(struct mlx5_core_dev dev, u64 addr, struct page page, u16 func_id)
92	{
93	struct rb_root *root = &dev->priv.page_root;
94	struct rb_node **new = &root->rb_node;
95	struct rb_node *parent = NULL;
96	struct fw_page *nfp;
97	struct fw_page *tfp;
98
99	while (*new) {
100	parent = *new;
101	tfp = rb_entry(parent, struct fw_page, rb_node);
102	if (tfp->addr < addr)
103	new = &parent->rb_left;
104	else if (tfp->addr > addr)
105	new = &parent->rb_right;
106	else
107	return -EEXIST;
108	}
109
110	nfp = kmalloc(sizeof(*nfp), GFP_KERNEL);
111	if (!nfp)
112	return -ENOMEM;
113
114	nfp->addr = addr;
115	nfp->page = page;
116	nfp->func_id = func_id;
117
118	rb_link_node(&nfp->rb_node, parent, new);
119	rb_insert_color(&nfp->rb_node, root);
120
121	return 0;
122	}
123
124	static struct page remove_page(struct mlx5_core_dev dev, u64 addr)
125	{
126	struct rb_root *root = &dev->priv.page_root;
127	struct rb_node *tmp = root->rb_node;
128	struct page *result = NULL;
129	struct fw_page *tfp;
130
131	while (tmp) {
132	tfp = rb_entry(tmp, struct fw_page, rb_node);
133	if (tfp->addr < addr) {
134	tmp = tmp->rb_left;
135	} else if (tfp->addr > addr) {
136	tmp = tmp->rb_right;
137	} else {
138	rb_erase(&tfp->rb_node, root);
139	result = tfp->page;
140	kfree(tfp);
141	break;
142	}
143	}
144
145	return result;
146	}
147
148	static int mlx5_cmd_query_pages(struct mlx5_core_dev dev, u16 func_id,
149	s16 pages, s16 init_pages)
150	{
151	struct mlx5_query_pages_inbox in;
152	struct mlx5_query_pages_outbox out;
153	int err;
154
155	memset(&in, 0, sizeof(in));
156	memset(&out, 0, sizeof(out));
157	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
158	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
159	if (err)
160	return err;
161
162	if (out.hdr.status)
163	return mlx5_cmd_status_to_err(&out.hdr);
164
165	if (pages)
166	*pages = be16_to_cpu(out.num_pages);
167	if (init_pages)
168	*init_pages = be16_to_cpu(out.init_pages);
169	*func_id = be16_to_cpu(out.func_id);
170
171	return err;
172	}
173
174	static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
175	int notify_fail)
176	{
177	struct mlx5_manage_pages_inbox *in;
178	struct mlx5_manage_pages_outbox out;
179	struct page *page;
180	int inlen;
181	u64 addr;
182	int err;
183	int i;
184
185	inlen = sizeof(in) + npages sizeof(in->pas[0]);
186	in = mlx5_vzalloc(inlen);
187	if (!in) {
188	mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
189	return -ENOMEM;
190	}
191	memset(&out, 0, sizeof(out));
192
193	for (i = 0; i < npages; i++) {
194	page = alloc_page(GFP_HIGHUSER);
195	if (!page) {
196	err = -ENOMEM;
197	mlx5_core_warn(dev, "failed to allocate page\n");
198	goto out_alloc;
199	}
200	addr = dma_map_page(&dev->pdev->dev, page, 0,
201	PAGE_SIZE, DMA_BIDIRECTIONAL);
202	if (dma_mapping_error(&dev->pdev->dev, addr)) {
203	mlx5_core_warn(dev, "failed dma mapping page\n");
204	__free_page(page);
205	err = -ENOMEM;
206	goto out_alloc;
207	}
208	err = insert_page(dev, addr, page, func_id);
209	if (err) {
210	mlx5_core_err(dev, "failed to track allocated page\n");
211	dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
212	__free_page(page);
213	err = -ENOMEM;
214	goto out_alloc;
215	}
216	in->pas[i] = cpu_to_be64(addr);
217	}
218
219	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
220	in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
221	in->func_id = cpu_to_be16(func_id);
222	in->num_entries = cpu_to_be16(npages);
223	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
224	mlx5_core_dbg(dev, "err %d\n", err);
225	if (err) {
226	mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
227	goto out_alloc;
228	}
229	dev->priv.fw_pages += npages;
230
231	if (out.hdr.status) {
232	err = mlx5_cmd_status_to_err(&out.hdr);
233	if (err) {
234	mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n", func_id, npages, out.hdr.status);
235	goto out_alloc;
236	}
237	}
238
239	mlx5_core_dbg(dev, "err %d\n", err);
240
241	goto out_free;
242
243	out_alloc:
244	if (notify_fail) {
245	memset(in, 0, inlen);
246	memset(&out, 0, sizeof(out));
247	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
248	in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
249	if (mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out)))
250	mlx5_core_warn(dev, "\n");
251	}
252	for (i--; i >= 0; i--) {
253	addr = be64_to_cpu(in->pas[i]);
254	page = remove_page(dev, addr);
255	if (!page) {
256	mlx5_core_err(dev, "BUG: can't remove page at addr 0x%llx\n",
257	addr);
258	continue;
259	}
260	dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
261	__free_page(page);
262	}
263
264	out_free:
265	mlx5_vfree(in);
266	return err;
267	}
268
269	static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
270	int *nclaimed)
271	{
272	struct mlx5_manage_pages_inbox in;
273	struct mlx5_manage_pages_outbox *out;
274	struct page *page;
275	int num_claimed;
276	int outlen;
277	u64 addr;
278	int err;
279	int i;
280
281	memset(&in, 0, sizeof(in));
282	outlen = sizeof(out) + npages sizeof(out->pas[0]);
283	out = mlx5_vzalloc(outlen);
284	if (!out)
285	return -ENOMEM;
286
287	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
288	in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
289	in.func_id = cpu_to_be16(func_id);
290	in.num_entries = cpu_to_be16(npages);
291	mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
292	err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
293	if (err) {
294	mlx5_core_err(dev, "failed recliaming pages\n");
295	goto out_free;
296	}
297	dev->priv.fw_pages -= npages;
298
299	if (out->hdr.status) {
300	err = mlx5_cmd_status_to_err(&out->hdr);
301	goto out_free;
302	}
303
304	num_claimed = be16_to_cpu(out->num_entries);
305	if (nclaimed)
306	*nclaimed = num_claimed;
307
308	for (i = 0; i < num_claimed; i++) {
309	addr = be64_to_cpu(out->pas[i]);
310	page = remove_page(dev, addr);
311	if (!page) {
312	mlx5_core_warn(dev, "FW reported unknown DMA address 0x%llx\n", addr);
313	} else {
314	dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
315	__free_page(page);
316	}
317	}
318
319	out_free:
320	mlx5_vfree(out);
321	return err;
322	}
323
324	static void pages_work_handler(struct work_struct *work)
325	{
326	struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
327	struct mlx5_core_dev *dev = req->dev;
328	int err = 0;
329
330	if (req->npages < 0)
331	err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
332	else if (req->npages > 0)
333	err = give_pages(dev, req->func_id, req->npages, 1);
334
335	if (err)
336	mlx5_core_warn(dev, "%s fail %d\n", req->npages < 0 ?
337	"reclaim" : "give", err);
338
339	kfree(req);
340	}
341
342	void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
343	s16 npages)
344	{
345	struct mlx5_pages_req *req;
346
347	req = kzalloc(sizeof(*req), GFP_ATOMIC);
348	if (!req) {
349	mlx5_core_warn(dev, "failed to allocate pages request\n");
350	return;
351	}
352
353	req->dev = dev;
354	req->func_id = func_id;
355	req->npages = npages;
356	INIT_WORK(&req->work, pages_work_handler);
357	queue_work(dev->priv.pg_wq, &req->work);
358	}
359
360	int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev)
361	{
362	s16 uninitialized_var(init_pages);
363	u16 uninitialized_var(func_id);
364	int err;
365
366	err = mlx5_cmd_query_pages(dev, &func_id, NULL, &init_pages);
367	if (err)
368	return err;
369
370	mlx5_core_dbg(dev, "requested %d init pages for func_id 0x%x\n", init_pages, func_id);
371
372	return give_pages(dev, func_id, init_pages, 0);
373	}
374
375	static int optimal_reclaimed_pages(void)
376	{
377	struct mlx5_cmd_prot_block *block;
378	struct mlx5_cmd_layout *lay;
379	int ret;
380
381	ret = (sizeof(lay->in) + sizeof(block->data) -
382	sizeof(struct mlx5_manage_pages_outbox)) / 8;
383
384	return ret;
385	}
386
387	int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
388	{
389	unsigned long end = jiffies + msecs_to_jiffies(5000);
390	struct fw_page *fwp;
391	struct rb_node *p;
392	int err;
393
394	do {
395	p = rb_first(&dev->priv.page_root);
396	if (p) {
397	fwp = rb_entry(p, struct fw_page, rb_node);
398	err = reclaim_pages(dev, fwp->func_id, optimal_reclaimed_pages(), NULL);
399	if (err) {
400	mlx5_core_warn(dev, "failed reclaiming pages (%d)\n", err);
401	return err;
402	}
403	}
404	if (time_after(jiffies, end)) {
405	mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
406	break;
407	}
408	} while (p);
409
410	return 0;
411	}
412
413	void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
414	{
415	dev->priv.page_root = RB_ROOT;
416	}
417
418	void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
419	{
420	/* nothing */
421	}
422
423	int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
424	{
425	dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
426	if (!dev->priv.pg_wq)
427	return -ENOMEM;
428
429	return 0;
430	}
431
432	void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
433	{
434	destroy_workqueue(dev->priv.pg_wq);
435	}