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

/*
 * Copyright (c) 2013-2015, Mellanox Technologies. 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
};

enum {
	MLX5_BOOT_PAGES		= 1,
	MLX5_INIT_PAGES		= 2,
	MLX5_POST_INIT_PAGES	= 3
};

struct mlx5_pages_req {
	struct mlx5_core_dev *dev;
	u16	func_id;
	s32	npages;
	struct work_struct work;
};

struct fw_page {
	struct rb_node		rb_node;
	u64			addr;
	struct page	       *page;
	u16			func_id;
	unsigned long		bitmask;
	struct list_head	list;
	unsigned		free_count;
};

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

struct mlx5_query_pages_outbox {
	struct mlx5_outbox_hdr	hdr;
	__be16			rsvd;
	__be16			func_id;
	__be32			num_pages;
};

struct mlx5_manage_pages_inbox {
	struct mlx5_inbox_hdr	hdr;
	__be16			rsvd;
	__be16			func_id;
	__be32			num_entries;
	__be64			pas[0];
};

struct mlx5_manage_pages_outbox {
	struct mlx5_outbox_hdr	hdr;
	__be32			num_entries;
	u8			rsvd[4];
	__be64			pas[0];
};

enum {
	MAX_RECLAIM_TIME_MSECS	= 5000,
};

enum {
	MLX5_MAX_RECLAIM_TIME_MILI	= 5000,
	MLX5_NUM_4K_IN_PAGE		= PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
};

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;
	int i;

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

	nfp->addr = addr;
	nfp->page = page;
	nfp->func_id = func_id;
	nfp->free_count = MLX5_NUM_4K_IN_PAGE;
	for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
		set_bit(i, &nfp->bitmask);

	rb_link_node(&nfp->rb_node, parent, new);
	rb_insert_color(&nfp->rb_node, root);
	list_add(&nfp->list, &dev->priv.free_list);

	return 0;
}

static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
{
	struct rb_root *root = &dev->priv.page_root;
	struct rb_node *tmp = root->rb_node;
	struct fw_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 {
			result = tfp;
			break;
		}
	}

	return result;
}

static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
				s32 *npages, int boot)
{
	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);
	in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_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);

	*npages = be32_to_cpu(out.num_pages);
	*func_id = be16_to_cpu(out.func_id);

	return err;
}

static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
{
	struct fw_page *fp;
	unsigned n;

	if (list_empty(&dev->priv.free_list))
		return -ENOMEM;

	fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
	n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
	if (n >= MLX5_NUM_4K_IN_PAGE) {
		mlx5_core_warn(dev, "alloc 4k bug\n");
		return -ENOENT;
	}
	clear_bit(n, &fp->bitmask);
	fp->free_count--;
	if (!fp->free_count)
		list_del(&fp->list);

	*addr = fp->addr + n * MLX5_ADAPTER_PAGE_SIZE;

	return 0;
}

static void free_4k(struct mlx5_core_dev *dev, u64 addr)
{
	struct fw_page *fwp;
	int n;

	fwp = find_fw_page(dev, addr & PAGE_MASK);
	if (!fwp) {
		mlx5_core_warn(dev, "page not found\n");
		return;
	}

	n = (addr & ~PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
	fwp->free_count++;
	set_bit(n, &fwp->bitmask);
	if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
		rb_erase(&fwp->rb_node, &dev->priv.page_root);
		if (fwp->free_count != 1)
			list_del(&fwp->list);
		dma_unmap_page(&dev->pdev->dev, addr & PAGE_MASK, PAGE_SIZE,
			       DMA_BIDIRECTIONAL);
		__free_page(fwp->page);
		kfree(fwp);
	} else if (fwp->free_count == 1) {
		list_add(&fwp->list, &dev->priv.free_list);
	}
}

static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
{
	struct page *page;
	u64 addr;
	int err;
	int nid = dev_to_node(&dev->pdev->dev);

	page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
	if (!page) {
		mlx5_core_warn(dev, "failed to allocate page\n");
		return -ENOMEM;
	}
	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");
		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");
		goto out_mapping;
	}

	return 0;

out_mapping:
	dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);

out_alloc:
	__free_page(page);

	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 mlx5_manage_pages_inbox *nin;
	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++) {
retry:
		err = alloc_4k(dev, &addr);
		if (err) {
			if (err == -ENOMEM)
				err = alloc_system_page(dev, func_id);
			if (err)
				goto out_4k;

			goto retry;
		}
		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_be32(npages);
	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
	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) {
		nin = kzalloc(sizeof(*nin), GFP_KERNEL);
		if (!nin) {
			mlx5_core_warn(dev, "allocation failed\n");
			goto out_4k;
		}
		memset(&out, 0, sizeof(out));
		nin->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
		nin->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
		if (mlx5_cmd_exec(dev, nin, sizeof(*nin), &out, sizeof(out)))
			mlx5_core_warn(dev, "page notify failed\n");
		kfree(nin);
	}

out_4k:
	for (i--; i >= 0; i--)
		free_4k(dev, be64_to_cpu(in->pas[i]));
out_free:
	kvfree(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;
	int num_claimed;
	int outlen;
	u64 addr;
	int err;
	int i;

	if (nclaimed)
		*nclaimed = 0;

	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_be32(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 reclaiming 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 = be32_to_cpu(out->num_entries);
	if (nclaimed)
		*nclaimed = num_claimed;

	for (i = 0; i < num_claimed; i++) {
		addr = be64_to_cpu(out->pas[i]);
		free_4k(dev, addr);
	}

out_free:
	kvfree(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,
				 s32 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, int boot)
{
	u16 uninitialized_var(func_id);
	s32 uninitialized_var(npages);
	int err;

	err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
	if (err)
		return err;

	mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
		      npages, boot ? "boot" : "init", func_id);

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

enum {
	MLX5_BLKS_FOR_RECLAIM_PAGES = 12
};

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

	ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
	       sizeof(struct mlx5_manage_pages_outbox)) /
	       FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);

	return ret;
}

int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
{
	unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
	struct fw_page *fwp;
	struct rb_node *p;
	int nclaimed = 0;
	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(),
					    &nclaimed);
			if (err) {
				mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
					       err);
				return err;
			}
			if (nclaimed)
				end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
		}
		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;
	INIT_LIST_HEAD(&dev->priv.free_list);
}

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	1	/*
302bdf68	2	* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
e126ba97 EC	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
0a324f31 ML	46	enum {
	47	MLX5_BOOT_PAGES = 1,
	48	MLX5_INIT_PAGES = 2,
	49	MLX5_POST_INIT_PAGES = 3
	50	};
	51
e126ba97 EC	52	struct mlx5_pages_req {
e126ba97 EC	53	struct mlx5_core_dev *dev;
f241e749	54	u16 func_id;
0a324f31	55	s32 npages;
e126ba97 EC	56	struct work_struct work;
	57	};
	58
	59	struct fw_page {
bf0bf77f EC	60	struct rb_node rb_node;
	61	u64 addr;
	62	struct page *page;
	63	u16 func_id;
	64	unsigned long bitmask;
	65	struct list_head list;
	66	unsigned free_count;
e126ba97 EC	67	};
	68
	69	struct mlx5_query_pages_inbox {
	70	struct mlx5_inbox_hdr hdr;
	71	u8 rsvd[8];
	72	};
	73
	74	struct mlx5_query_pages_outbox {
	75	struct mlx5_outbox_hdr hdr;
0a324f31	76	__be16 rsvd;
e126ba97	77	__be16 func_id;
0a324f31	78	__be32 num_pages;
e126ba97 EC	79	};
	80
	81	struct mlx5_manage_pages_inbox {
	82	struct mlx5_inbox_hdr hdr;
0a324f31	83	__be16 rsvd;
e126ba97	84	__be16 func_id;
0a324f31	85	__be32 num_entries;
e126ba97 EC	86	__be64 pas[0];
	87	};
	88
	89	struct mlx5_manage_pages_outbox {
	90	struct mlx5_outbox_hdr hdr;
0a324f31 ML	91	__be32 num_entries;
0a324f31 ML	92	u8 rsvd[4];
e126ba97 EC	93	__be64 pas[0];
	94	};
	95
dabed0e6 EC	96	enum {
	97	MAX_RECLAIM_TIME_MSECS = 5000,
	98	};
	99
bf0bf77f EC	100	enum {
bf0bf77f EC	101	MLX5_MAX_RECLAIM_TIME_MILI = 5000,
05bdb2ab	102	MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / MLX5_ADAPTER_PAGE_SIZE,
bf0bf77f EC	103	};
bf0bf77f EC	104
e126ba97 EC	105	static int insert_page(struct mlx5_core_dev dev, u64 addr, struct page page, u16 func_id)
	106	{
	107	struct rb_root *root = &dev->priv.page_root;
	108	struct rb_node **new = &root->rb_node;
	109	struct rb_node *parent = NULL;
	110	struct fw_page *nfp;
	111	struct fw_page *tfp;
bf0bf77f	112	int i;
e126ba97 EC	113
	114	while (*new) {
	115	parent = *new;
	116	tfp = rb_entry(parent, struct fw_page, rb_node);
	117	if (tfp->addr < addr)
	118	new = &parent->rb_left;
	119	else if (tfp->addr > addr)
	120	new = &parent->rb_right;
	121	else
	122	return -EEXIST;
	123	}
	124
bf0bf77f	125	nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
e126ba97 EC	126	if (!nfp)
	127	return -ENOMEM;
	128
	129	nfp->addr = addr;
	130	nfp->page = page;
	131	nfp->func_id = func_id;
bf0bf77f EC	132	nfp->free_count = MLX5_NUM_4K_IN_PAGE;
	133	for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
	134	set_bit(i, &nfp->bitmask);
e126ba97 EC	135
	136	rb_link_node(&nfp->rb_node, parent, new);
	137	rb_insert_color(&nfp->rb_node, root);
bf0bf77f	138	list_add(&nfp->list, &dev->priv.free_list);
e126ba97 EC	139
	140	return 0;
	141	}
	142
bf0bf77f	143	static struct fw_page find_fw_page(struct mlx5_core_dev dev, u64 addr)
e126ba97 EC	144	{
	145	struct rb_root *root = &dev->priv.page_root;
	146	struct rb_node *tmp = root->rb_node;
bf0bf77f	147	struct fw_page *result = NULL;
e126ba97 EC	148	struct fw_page *tfp;
	149
	150	while (tmp) {
	151	tfp = rb_entry(tmp, struct fw_page, rb_node);
	152	if (tfp->addr < addr) {
	153	tmp = tmp->rb_left;
	154	} else if (tfp->addr > addr) {
	155	tmp = tmp->rb_right;
	156	} else {
bf0bf77f	157	result = tfp;
e126ba97 EC	158	break;
	159	}
	160	}
	161
	162	return result;
	163	}
	164
	165	static int mlx5_cmd_query_pages(struct mlx5_core_dev dev, u16 func_id,
0a324f31	166	s32 *npages, int boot)
e126ba97 EC	167	{
	168	struct mlx5_query_pages_inbox in;
	169	struct mlx5_query_pages_outbox out;
	170	int err;
	171
	172	memset(&in, 0, sizeof(in));
	173	memset(&out, 0, sizeof(out));
	174	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
0a324f31 ML	175	in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
0a324f31 ML	176
e126ba97 EC	177	err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
	178	if (err)
	179	return err;
	180
	181	if (out.hdr.status)
	182	return mlx5_cmd_status_to_err(&out.hdr);
	183
0a324f31	184	*npages = be32_to_cpu(out.num_pages);
e126ba97 EC	185	*func_id = be16_to_cpu(out.func_id);
	186
	187	return err;
	188	}
	189
bf0bf77f EC	190	static int alloc_4k(struct mlx5_core_dev dev, u64 addr)
	191	{
	192	struct fw_page *fp;
	193	unsigned n;
	194
24e42754	195	if (list_empty(&dev->priv.free_list))
bf0bf77f	196	return -ENOMEM;
bf0bf77f EC	197
	198	fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
	199	n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
	200	if (n >= MLX5_NUM_4K_IN_PAGE) {
	201	mlx5_core_warn(dev, "alloc 4k bug\n");
	202	return -ENOENT;
	203	}
	204	clear_bit(n, &fp->bitmask);
	205	fp->free_count--;
	206	if (!fp->free_count)
	207	list_del(&fp->list);
	208
05bdb2ab	209	addr = fp->addr + n MLX5_ADAPTER_PAGE_SIZE;
bf0bf77f EC	210
	211	return 0;
	212	}
	213
	214	static void free_4k(struct mlx5_core_dev *dev, u64 addr)
	215	{
	216	struct fw_page *fwp;
	217	int n;
	218
	219	fwp = find_fw_page(dev, addr & PAGE_MASK);
	220	if (!fwp) {
	221	mlx5_core_warn(dev, "page not found\n");
	222	return;
	223	}
	224
05bdb2ab	225	n = (addr & ~PAGE_MASK) >> MLX5_ADAPTER_PAGE_SHIFT;
bf0bf77f EC	226	fwp->free_count++;
	227	set_bit(n, &fwp->bitmask);
	228	if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
	229	rb_erase(&fwp->rb_node, &dev->priv.page_root);
2b136d02 EC	230	if (fwp->free_count != 1)
2b136d02 EC	231	list_del(&fwp->list);
05bdb2ab EC	232	dma_unmap_page(&dev->pdev->dev, addr & PAGE_MASK, PAGE_SIZE,
05bdb2ab EC	233	DMA_BIDIRECTIONAL);
bf0bf77f EC	234	__free_page(fwp->page);
	235	kfree(fwp);
	236	} else if (fwp->free_count == 1) {
	237	list_add(&fwp->list, &dev->priv.free_list);
	238	}
	239	}
	240
	241	static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
	242	{
	243	struct page *page;
	244	u64 addr;
	245	int err;
ad189106	246	int nid = dev_to_node(&dev->pdev->dev);
bf0bf77f	247
ad189106	248	page = alloc_pages_node(nid, GFP_HIGHUSER, 0);
bf0bf77f EC	249	if (!page) {
	250	mlx5_core_warn(dev, "failed to allocate page\n");
	251	return -ENOMEM;
	252	}
	253	addr = dma_map_page(&dev->pdev->dev, page, 0,
	254	PAGE_SIZE, DMA_BIDIRECTIONAL);
	255	if (dma_mapping_error(&dev->pdev->dev, addr)) {
	256	mlx5_core_warn(dev, "failed dma mapping page\n");
	257	err = -ENOMEM;
	258	goto out_alloc;
	259	}
	260	err = insert_page(dev, addr, page, func_id);
	261	if (err) {
	262	mlx5_core_err(dev, "failed to track allocated page\n");
	263	goto out_mapping;
	264	}
	265
	266	return 0;
	267
	268	out_mapping:
	269	dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
	270
	271	out_alloc:
	272	__free_page(page);
	273
	274	return err;
	275	}
e126ba97 EC	276	static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
	277	int notify_fail)
	278	{
	279	struct mlx5_manage_pages_inbox *in;
	280	struct mlx5_manage_pages_outbox out;
952f5f6e	281	struct mlx5_manage_pages_inbox *nin;
e126ba97 EC	282	int inlen;
	283	u64 addr;
	284	int err;
	285	int i;
	286
	287	inlen = sizeof(in) + npages sizeof(in->pas[0]);
	288	in = mlx5_vzalloc(inlen);
	289	if (!in) {
	290	mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
	291	return -ENOMEM;
	292	}
	293	memset(&out, 0, sizeof(out));
	294
	295	for (i = 0; i < npages; i++) {
bf0bf77f EC	296	retry:
bf0bf77f EC	297	err = alloc_4k(dev, &addr);
e126ba97	298	if (err) {
bf0bf77f EC	299	if (err == -ENOMEM)
	300	err = alloc_system_page(dev, func_id);
	301	if (err)
	302	goto out_4k;
	303
	304	goto retry;
e126ba97 EC	305	}
	306	in->pas[i] = cpu_to_be64(addr);
	307	}
	308
	309	in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
	310	in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
	311	in->func_id = cpu_to_be16(func_id);
0a324f31	312	in->num_entries = cpu_to_be32(npages);
e126ba97	313	err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
e126ba97	314	if (err) {
1a91de28 JP	315	mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n",
1a91de28 JP	316	func_id, npages, err);
e126ba97 EC	317	goto out_alloc;
	318	}
	319	dev->priv.fw_pages += npages;
	320
	321	if (out.hdr.status) {
	322	err = mlx5_cmd_status_to_err(&out.hdr);
	323	if (err) {
1a91de28 JP	324	mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n",
1a91de28 JP	325	func_id, npages, out.hdr.status);
e126ba97 EC	326	goto out_alloc;
	327	}
	328	}
	329
	330	mlx5_core_dbg(dev, "err %d\n", err);
	331
	332	goto out_free;
	333
	334	out_alloc:
	335	if (notify_fail) {
952f5f6e EC	336	nin = kzalloc(sizeof(*nin), GFP_KERNEL);
	337	if (!nin) {
	338	mlx5_core_warn(dev, "allocation failed\n");
bf0bf77f	339	goto out_4k;
952f5f6e	340	}
e126ba97	341	memset(&out, 0, sizeof(out));
952f5f6e EC	342	nin->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
	343	nin->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
	344	if (mlx5_cmd_exec(dev, nin, sizeof(*nin), &out, sizeof(out)))
	345	mlx5_core_warn(dev, "page notify failed\n");
	346	kfree(nin);
e126ba97	347	}
952f5f6e	348
bf0bf77f EC	349	out_4k:
	350	for (i--; i >= 0; i--)
	351	free_4k(dev, be64_to_cpu(in->pas[i]));
e126ba97	352	out_free:
479163f4	353	kvfree(in);
e126ba97 EC	354	return err;
	355	}
	356
	357	static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
	358	int *nclaimed)
	359	{
	360	struct mlx5_manage_pages_inbox in;
	361	struct mlx5_manage_pages_outbox *out;
e126ba97 EC	362	int num_claimed;
	363	int outlen;
	364	u64 addr;
	365	int err;
	366	int i;
	367
dabed0e6 EC	368	if (nclaimed)
	369	*nclaimed = 0;
	370
e126ba97 EC	371	memset(&in, 0, sizeof(in));
	372	outlen = sizeof(out) + npages sizeof(out->pas[0]);
	373	out = mlx5_vzalloc(outlen);
	374	if (!out)
	375	return -ENOMEM;
	376
	377	in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
	378	in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
	379	in.func_id = cpu_to_be16(func_id);
0a324f31	380	in.num_entries = cpu_to_be32(npages);
e126ba97 EC	381	mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
	382	err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
	383	if (err) {
1a91de28	384	mlx5_core_err(dev, "failed reclaiming pages\n");
e126ba97 EC	385	goto out_free;
	386	}
	387	dev->priv.fw_pages -= npages;
	388
	389	if (out->hdr.status) {
	390	err = mlx5_cmd_status_to_err(&out->hdr);
	391	goto out_free;
	392	}
	393
0a324f31	394	num_claimed = be32_to_cpu(out->num_entries);
e126ba97 EC	395	if (nclaimed)
	396	*nclaimed = num_claimed;
	397
	398	for (i = 0; i < num_claimed; i++) {
	399	addr = be64_to_cpu(out->pas[i]);
bf0bf77f	400	free_4k(dev, addr);
e126ba97 EC	401	}
	402
	403	out_free:
479163f4	404	kvfree(out);
e126ba97 EC	405	return err;
	406	}
	407
	408	static void pages_work_handler(struct work_struct *work)
	409	{
	410	struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
	411	struct mlx5_core_dev *dev = req->dev;
	412	int err = 0;
	413
	414	if (req->npages < 0)
	415	err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
	416	else if (req->npages > 0)
	417	err = give_pages(dev, req->func_id, req->npages, 1);
	418
	419	if (err)
1a91de28 JP	420	mlx5_core_warn(dev, "%s fail %d\n",
1a91de28 JP	421	req->npages < 0 ? "reclaim" : "give", err);
e126ba97 EC	422
	423	kfree(req);
	424	}
	425
	426	void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
0a324f31	427	s32 npages)
e126ba97 EC	428	{
	429	struct mlx5_pages_req *req;
	430
	431	req = kzalloc(sizeof(*req), GFP_ATOMIC);
	432	if (!req) {
	433	mlx5_core_warn(dev, "failed to allocate pages request\n");
	434	return;
	435	}
	436
	437	req->dev = dev;
	438	req->func_id = func_id;
	439	req->npages = npages;
	440	INIT_WORK(&req->work, pages_work_handler);
	441	queue_work(dev->priv.pg_wq, &req->work);
	442	}
	443
cd23b14b	444	int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
e126ba97	445	{
e126ba97	446	u16 uninitialized_var(func_id);
0a324f31	447	s32 uninitialized_var(npages);
e126ba97 EC	448	int err;
e126ba97 EC	449
0a324f31	450	err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
e126ba97 EC	451	if (err)
	452	return err;
	453
0a324f31 ML	454	mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
0a324f31 ML	455	npages, boot ? "boot" : "init", func_id);
e126ba97	456
0a324f31	457	return give_pages(dev, func_id, npages, 0);
e126ba97 EC	458	}
e126ba97 EC	459
4e3d677b ML	460	enum {
	461	MLX5_BLKS_FOR_RECLAIM_PAGES = 12
	462	};
	463
e126ba97 EC	464	static int optimal_reclaimed_pages(void)
	465	{
	466	struct mlx5_cmd_prot_block *block;
	467	struct mlx5_cmd_layout *lay;
	468	int ret;
	469
4e3d677b ML	470	ret = (sizeof(lay->out) + MLX5_BLKS_FOR_RECLAIM_PAGES * sizeof(block->data) -
	471	sizeof(struct mlx5_manage_pages_outbox)) /
	472	FIELD_SIZEOF(struct mlx5_manage_pages_outbox, pas[0]);
e126ba97 EC	473
	474	return ret;
	475	}
	476
	477	int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
	478	{
dabed0e6	479	unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
e126ba97 EC	480	struct fw_page *fwp;
e126ba97 EC	481	struct rb_node *p;
dabed0e6	482	int nclaimed = 0;
e126ba97 EC	483	int err;
	484
	485	do {
	486	p = rb_first(&dev->priv.page_root);
	487	if (p) {
	488	fwp = rb_entry(p, struct fw_page, rb_node);
dabed0e6 EC	489	err = reclaim_pages(dev, fwp->func_id,
	490	optimal_reclaimed_pages(),
	491	&nclaimed);
e126ba97	492	if (err) {
1a91de28 JP	493	mlx5_core_warn(dev, "failed reclaiming pages (%d)\n",
1a91de28 JP	494	err);
e126ba97 EC	495	return err;
e126ba97 EC	496	}
dabed0e6 EC	497	if (nclaimed)
dabed0e6 EC	498	end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
e126ba97 EC	499	}
	500	if (time_after(jiffies, end)) {
	501	mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
	502	break;
	503	}
	504	} while (p);
	505
	506	return 0;
	507	}
	508
	509	void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
	510	{
	511	dev->priv.page_root = RB_ROOT;
bf0bf77f	512	INIT_LIST_HEAD(&dev->priv.free_list);
e126ba97 EC	513	}
	514
	515	void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
	516	{
	517	/* nothing */
	518	}
	519
	520	int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
	521	{
	522	dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
	523	if (!dev->priv.pg_wq)
	524	return -ENOMEM;
	525
	526	return 0;
	527	}
	528
	529	void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
	530	{
	531	destroy_workqueue(dev->priv.pg_wq);
	532	}