[deliverable/linux.git] / drivers / net / mlx4 / cmd.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005, 2006, 2007 Cisco Systems, 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 <linux/sched.h>
#include <linux/pci.h>
#include <linux/errno.h>

#include <linux/mlx4/cmd.h>

#include <asm/io.h>

#include "mlx4.h"

#define CMD_POLL_TOKEN 0xffff

enum {
	/* command completed successfully: */
	CMD_STAT_OK		= 0x00,
	/* Internal error (such as a bus error) occurred while processing command: */
	CMD_STAT_INTERNAL_ERR	= 0x01,
	/* Operation/command not supported or opcode modifier not supported: */
	CMD_STAT_BAD_OP		= 0x02,
	/* Parameter not supported or parameter out of range: */
	CMD_STAT_BAD_PARAM	= 0x03,
	/* System not enabled or bad system state: */
	CMD_STAT_BAD_SYS_STATE	= 0x04,
	/* Attempt to access reserved or unallocaterd resource: */
	CMD_STAT_BAD_RESOURCE	= 0x05,
	/* Requested resource is currently executing a command, or is otherwise busy: */
	CMD_STAT_RESOURCE_BUSY	= 0x06,
	/* Required capability exceeds device limits: */
	CMD_STAT_EXCEED_LIM	= 0x08,
	/* Resource is not in the appropriate state or ownership: */
	CMD_STAT_BAD_RES_STATE	= 0x09,
	/* Index out of range: */
	CMD_STAT_BAD_INDEX	= 0x0a,
	/* FW image corrupted: */
	CMD_STAT_BAD_NVMEM	= 0x0b,
	/* Attempt to modify a QP/EE which is not in the presumed state: */
	CMD_STAT_BAD_QP_STATE   = 0x10,
	/* Bad segment parameters (Address/Size): */
	CMD_STAT_BAD_SEG_PARAM	= 0x20,
	/* Memory Region has Memory Windows bound to: */
	CMD_STAT_REG_BOUND	= 0x21,
	/* HCA local attached memory not present: */
	CMD_STAT_LAM_NOT_PRE	= 0x22,
	/* Bad management packet (silently discarded): */
	CMD_STAT_BAD_PKT	= 0x30,
	/* More outstanding CQEs in CQ than new CQ size: */
	CMD_STAT_BAD_SIZE	= 0x40
};

enum {
	HCR_IN_PARAM_OFFSET	= 0x00,
	HCR_IN_MODIFIER_OFFSET	= 0x08,
	HCR_OUT_PARAM_OFFSET	= 0x0c,
	HCR_TOKEN_OFFSET	= 0x14,
	HCR_STATUS_OFFSET	= 0x18,

	HCR_OPMOD_SHIFT		= 12,
	HCR_T_BIT		= 21,
	HCR_E_BIT		= 22,
	HCR_GO_BIT		= 23
};

enum {
	GO_BIT_TIMEOUT_MSECS	= 10000
};

struct mlx4_cmd_context {
	struct completion	done;
	int			result;
	int			next;
	u64			out_param;
	u16			token;
};

static int mlx4_status_to_errno(u8 status)
{
	static const int trans_table[] = {
		[CMD_STAT_INTERNAL_ERR]	  = -EIO,
		[CMD_STAT_BAD_OP]	  = -EPERM,
		[CMD_STAT_BAD_PARAM]	  = -EINVAL,
		[CMD_STAT_BAD_SYS_STATE]  = -ENXIO,
		[CMD_STAT_BAD_RESOURCE]	  = -EBADF,
		[CMD_STAT_RESOURCE_BUSY]  = -EBUSY,
		[CMD_STAT_EXCEED_LIM]	  = -ENOMEM,
		[CMD_STAT_BAD_RES_STATE]  = -EBADF,
		[CMD_STAT_BAD_INDEX]	  = -EBADF,
		[CMD_STAT_BAD_NVMEM]	  = -EFAULT,
		[CMD_STAT_BAD_QP_STATE]   = -EINVAL,
		[CMD_STAT_BAD_SEG_PARAM]  = -EFAULT,
		[CMD_STAT_REG_BOUND]	  = -EBUSY,
		[CMD_STAT_LAM_NOT_PRE]	  = -EAGAIN,
		[CMD_STAT_BAD_PKT]	  = -EINVAL,
		[CMD_STAT_BAD_SIZE]	  = -ENOMEM,
	};

	if (status >= ARRAY_SIZE(trans_table) ||
	    (status != CMD_STAT_OK && trans_table[status] == 0))
		return -EIO;

	return trans_table[status];
}

static int cmd_pending(struct mlx4_dev *dev)
{
	u32 status = readl(mlx4_priv(dev)->cmd.hcr + HCR_STATUS_OFFSET);

	return (status & swab32(1 << HCR_GO_BIT)) ||
		(mlx4_priv(dev)->cmd.toggle ==
		 !!(status & swab32(1 << HCR_T_BIT)));
}

static int mlx4_cmd_post(struct mlx4_dev *dev, u64 in_param, u64 out_param,
			 u32 in_modifier, u8 op_modifier, u16 op, u16 token,
			 int event)
{
	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
	u32 __iomem *hcr = cmd->hcr;
	int ret = -EAGAIN;
	unsigned long end;

	mutex_lock(&cmd->hcr_mutex);

	end = jiffies;
	if (event)
		end += msecs_to_jiffies(GO_BIT_TIMEOUT_MSECS);

	while (cmd_pending(dev)) {
		if (time_after_eq(jiffies, end))
			goto out;
		cond_resched();
	}

	/*
	 * We use writel (instead of something like memcpy_toio)
	 * because writes of less than 32 bits to the HCR don't work
	 * (and some architectures such as ia64 implement memcpy_toio
	 * in terms of writeb).
	 */
	__raw_writel((__force u32) cpu_to_be32(in_param >> 32),		  hcr + 0);
	__raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful),  hcr + 1);
	__raw_writel((__force u32) cpu_to_be32(in_modifier),		  hcr + 2);
	__raw_writel((__force u32) cpu_to_be32(out_param >> 32),	  hcr + 3);
	__raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), hcr + 4);
	__raw_writel((__force u32) cpu_to_be32(token << 16),		  hcr + 5);

	/* __raw_writel may not order writes. */
	wmb();

	__raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT)		|
					       (cmd->toggle << HCR_T_BIT)	|
					       (event ? (1 << HCR_E_BIT) : 0)	|
					       (op_modifier << HCR_OPMOD_SHIFT) |
					       op),			  hcr + 6);

	/*
	 * Make sure that our HCR writes don't get mixed in with
	 * writes from another CPU starting a FW command.
	 */
	mmiowb();

	cmd->toggle = cmd->toggle ^ 1;

	ret = 0;

out:
	mutex_unlock(&cmd->hcr_mutex);
	return ret;
}

static int mlx4_cmd_poll(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
			 int out_is_imm, u32 in_modifier, u8 op_modifier,
			 u16 op, unsigned long timeout)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	void __iomem *hcr = priv->cmd.hcr;
	int err = 0;
	unsigned long end;

	down(&priv->cmd.poll_sem);

	err = mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
			    in_modifier, op_modifier, op, CMD_POLL_TOKEN, 0);
	if (err)
		goto out;

	end = msecs_to_jiffies(timeout) + jiffies;
	while (cmd_pending(dev) && time_before(jiffies, end))
		cond_resched();

	if (cmd_pending(dev)) {
		err = -ETIMEDOUT;
		goto out;
	}

	if (out_is_imm)
		*out_param =
			(u64) be32_to_cpu((__force __be32)
					  __raw_readl(hcr + HCR_OUT_PARAM_OFFSET)) << 32 |
			(u64) be32_to_cpu((__force __be32)
					  __raw_readl(hcr + HCR_OUT_PARAM_OFFSET + 4));

	err = mlx4_status_to_errno(be32_to_cpu((__force __be32)
					       __raw_readl(hcr + HCR_STATUS_OFFSET)) >> 24);

out:
	up(&priv->cmd.poll_sem);
	return err;
}

void mlx4_cmd_event(struct mlx4_dev *dev, u16 token, u8 status, u64 out_param)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_cmd_context *context =
		&priv->cmd.context[token & priv->cmd.token_mask];

	/* previously timed out command completing at long last */
	if (token != context->token)
		return;

	context->result    = mlx4_status_to_errno(status);
	context->out_param = out_param;

	complete(&context->done);
}

static int mlx4_cmd_wait(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
			 int out_is_imm, u32 in_modifier, u8 op_modifier,
			 u16 op, unsigned long timeout)
{
	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
	struct mlx4_cmd_context *context;
	int err = 0;

	down(&cmd->event_sem);

	spin_lock(&cmd->context_lock);
	BUG_ON(cmd->free_head < 0);
	context = &cmd->context[cmd->free_head];
	context->token += cmd->token_mask + 1;
	cmd->free_head = context->next;
	spin_unlock(&cmd->context_lock);

	init_completion(&context->done);

	mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
		      in_modifier, op_modifier, op, context->token, 1);

	if (!wait_for_completion_timeout(&context->done, msecs_to_jiffies(timeout))) {
		err = -EBUSY;
		goto out;
	}

	err = context->result;
	if (err)
		goto out;

	if (out_is_imm)
		*out_param = context->out_param;

out:
	spin_lock(&cmd->context_lock);
	context->next = cmd->free_head;
	cmd->free_head = context - cmd->context;
	spin_unlock(&cmd->context_lock);

	up(&cmd->event_sem);
	return err;
}

int __mlx4_cmd(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
	       int out_is_imm, u32 in_modifier, u8 op_modifier,
	       u16 op, unsigned long timeout)
{
	if (mlx4_priv(dev)->cmd.use_events)
		return mlx4_cmd_wait(dev, in_param, out_param, out_is_imm,
				     in_modifier, op_modifier, op, timeout);
	else
		return mlx4_cmd_poll(dev, in_param, out_param, out_is_imm,
				     in_modifier, op_modifier, op, timeout);
}
EXPORT_SYMBOL_GPL(__mlx4_cmd);

int mlx4_cmd_init(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	mutex_init(&priv->cmd.hcr_mutex);
	sema_init(&priv->cmd.poll_sem, 1);
	priv->cmd.use_events = 0;
	priv->cmd.toggle     = 1;

	priv->cmd.hcr = ioremap(pci_resource_start(dev->pdev, 0) + MLX4_HCR_BASE,
				MLX4_HCR_SIZE);
	if (!priv->cmd.hcr) {
		mlx4_err(dev, "Couldn't map command register.");
		return -ENOMEM;
	}

	priv->cmd.pool = pci_pool_create("mlx4_cmd", dev->pdev,
					 MLX4_MAILBOX_SIZE,
					 MLX4_MAILBOX_SIZE, 0);
	if (!priv->cmd.pool) {
		iounmap(priv->cmd.hcr);
		return -ENOMEM;
	}

	return 0;
}

void mlx4_cmd_cleanup(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);

	pci_pool_destroy(priv->cmd.pool);
	iounmap(priv->cmd.hcr);
}

/*
 * Switch to using events to issue FW commands (can only be called
 * after event queue for command events has been initialized).
 */
int mlx4_cmd_use_events(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int i;

	priv->cmd.context = kmalloc(priv->cmd.max_cmds *
				   sizeof (struct mlx4_cmd_context),
				   GFP_KERNEL);
	if (!priv->cmd.context)
		return -ENOMEM;

	for (i = 0; i < priv->cmd.max_cmds; ++i) {
		priv->cmd.context[i].token = i;
		priv->cmd.context[i].next  = i + 1;
	}

	priv->cmd.context[priv->cmd.max_cmds - 1].next = -1;
	priv->cmd.free_head = 0;

	sema_init(&priv->cmd.event_sem, priv->cmd.max_cmds);
	spin_lock_init(&priv->cmd.context_lock);

	for (priv->cmd.token_mask = 1;
	     priv->cmd.token_mask < priv->cmd.max_cmds;
	     priv->cmd.token_mask <<= 1)
		; /* nothing */
	--priv->cmd.token_mask;

	priv->cmd.use_events = 1;

	down(&priv->cmd.poll_sem);

	return 0;
}

/*
 * Switch back to polling (used when shutting down the device)
 */
void mlx4_cmd_use_polling(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	int i;

	priv->cmd.use_events = 0;

	for (i = 0; i < priv->cmd.max_cmds; ++i)
		down(&priv->cmd.event_sem);

	kfree(priv->cmd.context);

	up(&priv->cmd.poll_sem);
}

struct mlx4_cmd_mailbox *mlx4_alloc_cmd_mailbox(struct mlx4_dev *dev)
{
	struct mlx4_cmd_mailbox *mailbox;

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

	mailbox->buf = pci_pool_alloc(mlx4_priv(dev)->cmd.pool, GFP_KERNEL,
				      &mailbox->dma);
	if (!mailbox->buf) {
		kfree(mailbox);
		return ERR_PTR(-ENOMEM);
	}

	return mailbox;
}
EXPORT_SYMBOL_GPL(mlx4_alloc_cmd_mailbox);

void mlx4_free_cmd_mailbox(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox)
{
	if (!mailbox)
		return;

	pci_pool_free(mlx4_priv(dev)->cmd.pool, mailbox->buf, mailbox->dma);
	kfree(mailbox);
}
EXPORT_SYMBOL_GPL(mlx4_free_cmd_mailbox);
Commit	Line	Data
225c7b1f RD	1	/*
	2	* Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
	3	* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
	4	* Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
	5	*
	6	* This software is available to you under a choice of one of two
	7	* licenses. You may choose to be licensed under the terms of the GNU
	8	* General Public License (GPL) Version 2, available from the file
	9	* COPYING in the main directory of this source tree, or the
	10	* OpenIB.org BSD license below:
	11	*
	12	* Redistribution and use in source and binary forms, with or
	13	* without modification, are permitted provided that the following
	14	* conditions are met:
	15	*
	16	* - Redistributions of source code must retain the above
	17	* copyright notice, this list of conditions and the following
	18	* disclaimer.
	19	*
	20	* - Redistributions in binary form must reproduce the above
	21	* copyright notice, this list of conditions and the following
	22	* disclaimer in the documentation and/or other materials
	23	* provided with the distribution.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	26	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	27	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	28	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	29	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	30	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	31	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	32	* SOFTWARE.
	33	*/
	34
	35	#include <linux/sched.h>
	36	#include <linux/pci.h>
	37	#include <linux/errno.h>
	38
	39	#include <linux/mlx4/cmd.h>
	40
	41	#include <asm/io.h>
	42
	43	#include "mlx4.h"
	44
	45	#define CMD_POLL_TOKEN 0xffff
	46
	47	enum {
	48	/* command completed successfully: */
	49	CMD_STAT_OK = 0x00,
	50	/* Internal error (such as a bus error) occurred while processing command: */
	51	CMD_STAT_INTERNAL_ERR = 0x01,
	52	/* Operation/command not supported or opcode modifier not supported: */
	53	CMD_STAT_BAD_OP = 0x02,
	54	/* Parameter not supported or parameter out of range: */
	55	CMD_STAT_BAD_PARAM = 0x03,
	56	/* System not enabled or bad system state: */
	57	CMD_STAT_BAD_SYS_STATE = 0x04,
	58	/* Attempt to access reserved or unallocaterd resource: */
	59	CMD_STAT_BAD_RESOURCE = 0x05,
	60	/* Requested resource is currently executing a command, or is otherwise busy: */
	61	CMD_STAT_RESOURCE_BUSY = 0x06,
	62	/* Required capability exceeds device limits: */
	63	CMD_STAT_EXCEED_LIM = 0x08,
	64	/* Resource is not in the appropriate state or ownership: */
65	CMD_STAT_BAD_RES_STATE = 0x09,
66	/* Index out of range: */
67	CMD_STAT_BAD_INDEX = 0x0a,
68	/* FW image corrupted: */
69	CMD_STAT_BAD_NVMEM = 0x0b,
70	/* Attempt to modify a QP/EE which is not in the presumed state: */
71	CMD_STAT_BAD_QP_STATE = 0x10,
72	/* Bad segment parameters (Address/Size): */
73	CMD_STAT_BAD_SEG_PARAM = 0x20,
74	/* Memory Region has Memory Windows bound to: */
75	CMD_STAT_REG_BOUND = 0x21,
76	/* HCA local attached memory not present: */
77	CMD_STAT_LAM_NOT_PRE = 0x22,
78	/* Bad management packet (silently discarded): */
79	CMD_STAT_BAD_PKT = 0x30,
80	/* More outstanding CQEs in CQ than new CQ size: */
81	CMD_STAT_BAD_SIZE = 0x40
82	};
83
84	enum {
85	HCR_IN_PARAM_OFFSET = 0x00,
86	HCR_IN_MODIFIER_OFFSET = 0x08,
87	HCR_OUT_PARAM_OFFSET = 0x0c,
88	HCR_TOKEN_OFFSET = 0x14,
89	HCR_STATUS_OFFSET = 0x18,
90
91	HCR_OPMOD_SHIFT = 12,
92	HCR_T_BIT = 21,
93	HCR_E_BIT = 22,
94	HCR_GO_BIT = 23
95	};
96
97	enum {
36ce10d3	98	GO_BIT_TIMEOUT_MSECS = 10000
225c7b1f RD	99	};
	100
	101	struct mlx4_cmd_context {
	102	struct completion done;
	103	int result;
	104	int next;
	105	u64 out_param;
	106	u16 token;
	107	};
	108
ca281211 RD	109	static int mlx4_status_to_errno(u8 status)
ca281211 RD	110	{
225c7b1f RD	111	static const int trans_table[] = {
	112	[CMD_STAT_INTERNAL_ERR] = -EIO,
	113	[CMD_STAT_BAD_OP] = -EPERM,
	114	[CMD_STAT_BAD_PARAM] = -EINVAL,
	115	[CMD_STAT_BAD_SYS_STATE] = -ENXIO,
	116	[CMD_STAT_BAD_RESOURCE] = -EBADF,
	117	[CMD_STAT_RESOURCE_BUSY] = -EBUSY,
	118	[CMD_STAT_EXCEED_LIM] = -ENOMEM,
	119	[CMD_STAT_BAD_RES_STATE] = -EBADF,
	120	[CMD_STAT_BAD_INDEX] = -EBADF,
	121	[CMD_STAT_BAD_NVMEM] = -EFAULT,
	122	[CMD_STAT_BAD_QP_STATE] = -EINVAL,
	123	[CMD_STAT_BAD_SEG_PARAM] = -EFAULT,
	124	[CMD_STAT_REG_BOUND] = -EBUSY,
	125	[CMD_STAT_LAM_NOT_PRE] = -EAGAIN,
	126	[CMD_STAT_BAD_PKT] = -EINVAL,
	127	[CMD_STAT_BAD_SIZE] = -ENOMEM,
	128	};
	129
	130	if (status >= ARRAY_SIZE(trans_table) \|\|
	131	(status != CMD_STAT_OK && trans_table[status] == 0))
	132	return -EIO;
	133
	134	return trans_table[status];
	135	}
	136
	137	static int cmd_pending(struct mlx4_dev *dev)
	138	{
	139	u32 status = readl(mlx4_priv(dev)->cmd.hcr + HCR_STATUS_OFFSET);
	140
	141	return (status & swab32(1 << HCR_GO_BIT)) \|\|
	142	(mlx4_priv(dev)->cmd.toggle ==
	143	!!(status & swab32(1 << HCR_T_BIT)));
	144	}
	145
	146	static int mlx4_cmd_post(struct mlx4_dev *dev, u64 in_param, u64 out_param,
	147	u32 in_modifier, u8 op_modifier, u16 op, u16 token,
	148	int event)
	149	{
	150	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
	151	u32 __iomem *hcr = cmd->hcr;
	152	int ret = -EAGAIN;
	153	unsigned long end;
	154
	155	mutex_lock(&cmd->hcr_mutex);
	156
	157	end = jiffies;
	158	if (event)
36ce10d3	159	end += msecs_to_jiffies(GO_BIT_TIMEOUT_MSECS);
225c7b1f RD	160
	161	while (cmd_pending(dev)) {
	162	if (time_after_eq(jiffies, end))
	163	goto out;
	164	cond_resched();
	165	}
	166
	167	/*
	168	* We use writel (instead of something like memcpy_toio)
	169	* because writes of less than 32 bits to the HCR don't work
	170	* (and some architectures such as ia64 implement memcpy_toio
	171	* in terms of writeb).
	172	*/
	173	__raw_writel((__force u32) cpu_to_be32(in_param >> 32), hcr + 0);
	174	__raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful), hcr + 1);
	175	__raw_writel((__force u32) cpu_to_be32(in_modifier), hcr + 2);
	176	__raw_writel((__force u32) cpu_to_be32(out_param >> 32), hcr + 3);
	177	__raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), hcr + 4);
	178	__raw_writel((__force u32) cpu_to_be32(token << 16), hcr + 5);
	179
	180	/* __raw_writel may not order writes. */
	181	wmb();
	182
	183	__raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT) \|
	184	(cmd->toggle << HCR_T_BIT) \|
	185	(event ? (1 << HCR_E_BIT) : 0) \|
	186	(op_modifier << HCR_OPMOD_SHIFT) \|
	187	op), hcr + 6);
2e61c646 RD	188
	189	/*
	190	* Make sure that our HCR writes don't get mixed in with
	191	* writes from another CPU starting a FW command.
	192	*/
	193	mmiowb();
	194
225c7b1f RD	195	cmd->toggle = cmd->toggle ^ 1;
	196
	197	ret = 0;
	198
	199	out:
	200	mutex_unlock(&cmd->hcr_mutex);
	201	return ret;
	202	}
	203
	204	static int mlx4_cmd_poll(struct mlx4_dev dev, u64 in_param, u64 out_param,
	205	int out_is_imm, u32 in_modifier, u8 op_modifier,
	206	u16 op, unsigned long timeout)
	207	{
	208	struct mlx4_priv *priv = mlx4_priv(dev);
	209	void __iomem *hcr = priv->cmd.hcr;
	210	int err = 0;
	211	unsigned long end;
	212
	213	down(&priv->cmd.poll_sem);
	214
	215	err = mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
	216	in_modifier, op_modifier, op, CMD_POLL_TOKEN, 0);
	217	if (err)
	218	goto out;
	219
	220	end = msecs_to_jiffies(timeout) + jiffies;
	221	while (cmd_pending(dev) && time_before(jiffies, end))
	222	cond_resched();
	223
	224	if (cmd_pending(dev)) {
	225	err = -ETIMEDOUT;
	226	goto out;
	227	}
	228
	229	if (out_is_imm)
	230	*out_param =
	231	(u64) be32_to_cpu((__force __be32)
	232	__raw_readl(hcr + HCR_OUT_PARAM_OFFSET)) << 32 \|
	233	(u64) be32_to_cpu((__force __be32)
	234	__raw_readl(hcr + HCR_OUT_PARAM_OFFSET + 4));
	235
	236	err = mlx4_status_to_errno(be32_to_cpu((__force __be32)
	237	__raw_readl(hcr + HCR_STATUS_OFFSET)) >> 24);
	238
	239	out:
	240	up(&priv->cmd.poll_sem);
	241	return err;
	242	}
	243
	244	void mlx4_cmd_event(struct mlx4_dev *dev, u16 token, u8 status, u64 out_param)
	245	{
	246	struct mlx4_priv *priv = mlx4_priv(dev);
	247	struct mlx4_cmd_context *context =
	248	&priv->cmd.context[token & priv->cmd.token_mask];
	249
	250	/* previously timed out command completing at long last */
	251	if (token != context->token)
	252	return;
	253
	254	context->result = mlx4_status_to_errno(status);
	255	context->out_param = out_param;
	256
225c7b1f RD	257	complete(&context->done);
	258	}
	259
	260	static int mlx4_cmd_wait(struct mlx4_dev dev, u64 in_param, u64 out_param,
	261	int out_is_imm, u32 in_modifier, u8 op_modifier,
	262	u16 op, unsigned long timeout)
	263	{
	264	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
	265	struct mlx4_cmd_context *context;
	266	int err = 0;
	267
	268	down(&cmd->event_sem);
	269
	270	spin_lock(&cmd->context_lock);
	271	BUG_ON(cmd->free_head < 0);
	272	context = &cmd->context[cmd->free_head];
0981582d	273	context->token += cmd->token_mask + 1;
225c7b1f RD	274	cmd->free_head = context->next;
	275	spin_unlock(&cmd->context_lock);
	276
	277	init_completion(&context->done);
	278
	279	mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
	280	in_modifier, op_modifier, op, context->token, 1);
	281
	282	if (!wait_for_completion_timeout(&context->done, msecs_to_jiffies(timeout))) {
	283	err = -EBUSY;
	284	goto out;
	285	}
	286
	287	err = context->result;
	288	if (err)
	289	goto out;
	290
	291	if (out_is_imm)
	292	*out_param = context->out_param;
	293
	294	out:
	295	spin_lock(&cmd->context_lock);
	296	context->next = cmd->free_head;
	297	cmd->free_head = context - cmd->context;
	298	spin_unlock(&cmd->context_lock);
	299
	300	up(&cmd->event_sem);
	301	return err;
	302	}
	303
	304	int __mlx4_cmd(struct mlx4_dev dev, u64 in_param, u64 out_param,
	305	int out_is_imm, u32 in_modifier, u8 op_modifier,
	306	u16 op, unsigned long timeout)
	307	{
	308	if (mlx4_priv(dev)->cmd.use_events)
	309	return mlx4_cmd_wait(dev, in_param, out_param, out_is_imm,
	310	in_modifier, op_modifier, op, timeout);
	311	else
	312	return mlx4_cmd_poll(dev, in_param, out_param, out_is_imm,
	313	in_modifier, op_modifier, op, timeout);
	314	}
	315	EXPORT_SYMBOL_GPL(__mlx4_cmd);
	316
	317	int mlx4_cmd_init(struct mlx4_dev *dev)
	318	{
	319	struct mlx4_priv *priv = mlx4_priv(dev);
	320
	321	mutex_init(&priv->cmd.hcr_mutex);
	322	sema_init(&priv->cmd.poll_sem, 1);
	323	priv->cmd.use_events = 0;
	324	priv->cmd.toggle = 1;
	325
	326	priv->cmd.hcr = ioremap(pci_resource_start(dev->pdev, 0) + MLX4_HCR_BASE,
	327	MLX4_HCR_SIZE);
	328	if (!priv->cmd.hcr) {
	329	mlx4_err(dev, "Couldn't map command register.");
	330	return -ENOMEM;
	331	}
	332
	333	priv->cmd.pool = pci_pool_create("mlx4_cmd", dev->pdev,
	334	MLX4_MAILBOX_SIZE,
	335	MLX4_MAILBOX_SIZE, 0);
	336	if (!priv->cmd.pool) {
	337	iounmap(priv->cmd.hcr);
338	return -ENOMEM;
339	}
340
341	return 0;
342	}
343
344	void mlx4_cmd_cleanup(struct mlx4_dev *dev)
345	{
346	struct mlx4_priv *priv = mlx4_priv(dev);
347
348	pci_pool_destroy(priv->cmd.pool);
349	iounmap(priv->cmd.hcr);
350	}
351
352	/*
353	* Switch to using events to issue FW commands (can only be called
354	* after event queue for command events has been initialized).
355	*/
356	int mlx4_cmd_use_events(struct mlx4_dev *dev)
357	{
358	struct mlx4_priv *priv = mlx4_priv(dev);
359	int i;
360
361	priv->cmd.context = kmalloc(priv->cmd.max_cmds *
362	sizeof (struct mlx4_cmd_context),
363	GFP_KERNEL);
364	if (!priv->cmd.context)
365	return -ENOMEM;
366
367	for (i = 0; i < priv->cmd.max_cmds; ++i) {
368	priv->cmd.context[i].token = i;
369	priv->cmd.context[i].next = i + 1;
370	}
371
372	priv->cmd.context[priv->cmd.max_cmds - 1].next = -1;
373	priv->cmd.free_head = 0;
374
375	sema_init(&priv->cmd.event_sem, priv->cmd.max_cmds);
376	spin_lock_init(&priv->cmd.context_lock);
377
378	for (priv->cmd.token_mask = 1;
379	priv->cmd.token_mask < priv->cmd.max_cmds;
380	priv->cmd.token_mask <<= 1)
381	; /* nothing */
382	--priv->cmd.token_mask;
383
384	priv->cmd.use_events = 1;
385
386	down(&priv->cmd.poll_sem);
387
388	return 0;
389	}
390
391	/*
392	* Switch back to polling (used when shutting down the device)
393	*/
394	void mlx4_cmd_use_polling(struct mlx4_dev *dev)
395	{
396	struct mlx4_priv *priv = mlx4_priv(dev);
397	int i;
398
399	priv->cmd.use_events = 0;
400
401	for (i = 0; i < priv->cmd.max_cmds; ++i)
402	down(&priv->cmd.event_sem);
403
404	kfree(priv->cmd.context);
405
406	up(&priv->cmd.poll_sem);
407	}
408
409	struct mlx4_cmd_mailbox mlx4_alloc_cmd_mailbox(struct mlx4_dev dev)
410	{
411	struct mlx4_cmd_mailbox *mailbox;
412
413	mailbox = kmalloc(sizeof *mailbox, GFP_KERNEL);
414	if (!mailbox)
415	return ERR_PTR(-ENOMEM);
416
417	mailbox->buf = pci_pool_alloc(mlx4_priv(dev)->cmd.pool, GFP_KERNEL,
418	&mailbox->dma);
419	if (!mailbox->buf) {
420	kfree(mailbox);
421	return ERR_PTR(-ENOMEM);
422	}
423
424	return mailbox;
425	}
426	EXPORT_SYMBOL_GPL(mlx4_alloc_cmd_mailbox);
427
428	void mlx4_free_cmd_mailbox(struct mlx4_dev dev, struct mlx4_cmd_mailbox mailbox)
429	{
430	if (!mailbox)
431	return;
432
433	pci_pool_free(mlx4_priv(dev)->cmd.pool, mailbox->buf, mailbox->dma);
434	kfree(mailbox);
435	}
436	EXPORT_SYMBOL_GPL(mlx4_free_cmd_mailbox);