[linux-2.6-block.git] / drivers / gpu / drm / vmwgfx / vmwgfx_msg.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Copyright 2016 VMware, Inc., Palo Alto, CA., USA
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/frame.h>
#include <asm/hypervisor.h>
#include <drm/drmP.h>
#include "vmwgfx_drv.h"
#include "vmwgfx_msg.h"


#define MESSAGE_STATUS_SUCCESS  0x0001
#define MESSAGE_STATUS_DORECV   0x0002
#define MESSAGE_STATUS_CPT      0x0010
#define MESSAGE_STATUS_HB       0x0080

#define RPCI_PROTOCOL_NUM       0x49435052
#define GUESTMSG_FLAG_COOKIE    0x80000000

#define RETRIES                 3

#define VMW_HYPERVISOR_MAGIC    0x564D5868
#define VMW_HYPERVISOR_PORT     0x5658
#define VMW_HYPERVISOR_HB_PORT  0x5659

#define VMW_PORT_CMD_MSG        30
#define VMW_PORT_CMD_HB_MSG     0
#define VMW_PORT_CMD_OPEN_CHANNEL  (MSG_TYPE_OPEN << 16 | VMW_PORT_CMD_MSG)
#define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 | VMW_PORT_CMD_MSG)
#define VMW_PORT_CMD_SENDSIZE   (MSG_TYPE_SENDSIZE << 16 | VMW_PORT_CMD_MSG)
#define VMW_PORT_CMD_RECVSIZE   (MSG_TYPE_RECVSIZE << 16 | VMW_PORT_CMD_MSG)
#define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 | VMW_PORT_CMD_MSG)

#define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16)

static u32 vmw_msg_enabled = 1;

enum rpc_msg_type {
	MSG_TYPE_OPEN,
	MSG_TYPE_SENDSIZE,
	MSG_TYPE_SENDPAYLOAD,
	MSG_TYPE_RECVSIZE,
	MSG_TYPE_RECVPAYLOAD,
	MSG_TYPE_RECVSTATUS,
	MSG_TYPE_CLOSE,
};

struct rpc_channel {
	u16 channel_id;
	u32 cookie_high;
	u32 cookie_low;
};


/**
 * vmw_open_channel
 *
 * @channel: RPC channel
 * @protocol:
 *
 * Returns: 0 on success
 */
static int vmw_open_channel(struct rpc_channel *channel, unsigned int protocol)
{
	unsigned long eax, ebx, ecx, edx, si = 0, di = 0;

	VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL,
		(protocol | GUESTMSG_FLAG_COOKIE), si, di,
		VMW_HYPERVISOR_PORT,
		VMW_HYPERVISOR_MAGIC,
		eax, ebx, ecx, edx, si, di);

	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
		return -EINVAL;

	channel->channel_id  = HIGH_WORD(edx);
	channel->cookie_high = si;
	channel->cookie_low  = di;

	return 0;
}


/**
 * vmw_close_channel
 *
 * @channel: RPC channel
 *
 * Returns: 0 on success
 */
static int vmw_close_channel(struct rpc_channel *channel)
{
	unsigned long eax, ebx, ecx, edx, si, di;

	/* Set up additional parameters */
	si  = channel->cookie_high;
	di  = channel->cookie_low;

	VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL,
		0, si, di,
		(VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
		VMW_HYPERVISOR_MAGIC,
		eax, ebx, ecx, edx, si, di);

	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
		return -EINVAL;

	return 0;
}


/**
 * vmw_send_msg: Sends a message to the host
 *
 * @channel: RPC channel
 * @logmsg: NULL terminated string
 *
 * Returns: 0 on success
 */
static int vmw_send_msg(struct rpc_channel *channel, const char *msg)
{
	unsigned long eax, ebx, ecx, edx, si, di, bp;
	size_t msg_len = strlen(msg);
	int retries = 0;


	while (retries < RETRIES) {
		retries++;

		/* Set up additional parameters */
		si  = channel->cookie_high;
		di  = channel->cookie_low;

		VMW_PORT(VMW_PORT_CMD_SENDSIZE,
			msg_len, si, di,
			VMW_HYPERVISOR_PORT | (channel->channel_id << 16),
			VMW_HYPERVISOR_MAGIC,
			eax, ebx, ecx, edx, si, di);

		if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 ||
		    (HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
			/* Expected success + high-bandwidth. Give up. */
			return -EINVAL;
		}

		/* Send msg */
		si  = (uintptr_t) msg;
		di  = channel->cookie_low;
		bp  = channel->cookie_high;

		VMW_PORT_HB_OUT(
			(MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG,
			msg_len, si, di,
			VMW_HYPERVISOR_HB_PORT | (channel->channel_id << 16),
			VMW_HYPERVISOR_MAGIC, bp,
			eax, ebx, ecx, edx, si, di);

		if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) != 0) {
			return 0;
		} else if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
			/* A checkpoint occurred. Retry. */
			continue;
		} else {
			break;
		}
	}

	return -EINVAL;
}
STACK_FRAME_NON_STANDARD(vmw_send_msg);


/**
 * vmw_recv_msg: Receives a message from the host
 *
 * Note:  It is the caller's responsibility to call kfree() on msg.
 *
 * @channel:  channel opened by vmw_open_channel
 * @msg:  [OUT] message received from the host
 * @msg_len: message length
 */
static int vmw_recv_msg(struct rpc_channel *channel, void **msg,
			size_t *msg_len)
{
	unsigned long eax, ebx, ecx, edx, si, di, bp;
	char *reply;
	size_t reply_len;
	int retries = 0;


	*msg_len = 0;
	*msg = NULL;

	while (retries < RETRIES) {
		retries++;

		/* Set up additional parameters */
		si  = channel->cookie_high;
		di  = channel->cookie_low;

		VMW_PORT(VMW_PORT_CMD_RECVSIZE,
			0, si, di,
			(VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
			VMW_HYPERVISOR_MAGIC,
			eax, ebx, ecx, edx, si, di);

		if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 ||
		    (HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
			DRM_ERROR("Failed to get reply size for host message.\n");
			return -EINVAL;
		}

		/* No reply available.  This is okay. */
		if ((HIGH_WORD(ecx) & MESSAGE_STATUS_DORECV) == 0)
			return 0;

		reply_len = ebx;
		reply     = kzalloc(reply_len + 1, GFP_KERNEL);
		if (!reply) {
			DRM_ERROR("Cannot allocate memory for host message reply.\n");
			return -ENOMEM;
		}


		/* Receive buffer */
		si  = channel->cookie_high;
		di  = (uintptr_t) reply;
		bp  = channel->cookie_low;

		VMW_PORT_HB_IN(
			(MESSAGE_STATUS_SUCCESS << 16) | VMW_PORT_CMD_HB_MSG,
			reply_len, si, di,
			VMW_HYPERVISOR_HB_PORT | (channel->channel_id << 16),
			VMW_HYPERVISOR_MAGIC, bp,
			eax, ebx, ecx, edx, si, di);

		if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) == 0) {
			kfree(reply);

			if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
				/* A checkpoint occurred. Retry. */
				continue;
			}

			return -EINVAL;
		}

		reply[reply_len] = '\0';


		/* Ack buffer */
		si  = channel->cookie_high;
		di  = channel->cookie_low;

		VMW_PORT(VMW_PORT_CMD_RECVSTATUS,
			MESSAGE_STATUS_SUCCESS, si, di,
			(VMW_HYPERVISOR_PORT | (channel->channel_id << 16)),
			VMW_HYPERVISOR_MAGIC,
			eax, ebx, ecx, edx, si, di);

		if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) {
			kfree(reply);

			if ((HIGH_WORD(ecx) & MESSAGE_STATUS_CPT) != 0) {
				/* A checkpoint occurred. Retry. */
				continue;
			}

			return -EINVAL;
		}

		break;
	}

	if (retries == RETRIES)
		return -EINVAL;

	*msg_len = reply_len;
	*msg     = reply;

	return 0;
}
STACK_FRAME_NON_STANDARD(vmw_recv_msg);


/**
 * vmw_host_get_guestinfo: Gets a GuestInfo parameter
 *
 * Gets the value of a  GuestInfo.* parameter.  The value returned will be in
 * a string, and it is up to the caller to post-process.
 *
 * @guest_info_param:  Parameter to get, e.g. GuestInfo.svga.gl3
 * @buffer: if NULL, *reply_len will contain reply size.
 * @length: size of the reply_buf.  Set to size of reply upon return
 *
 * Returns: 0 on success
 */
int vmw_host_get_guestinfo(const char *guest_info_param,
			   char *buffer, size_t *length)
{
	struct rpc_channel channel;
	char *msg, *reply = NULL;
	size_t reply_len = 0;

	if (!vmw_msg_enabled)
		return -ENODEV;

	if (!guest_info_param || !length)
		return -EINVAL;

	msg = kasprintf(GFP_KERNEL, "info-get %s", guest_info_param);
	if (!msg) {
		DRM_ERROR("Cannot allocate memory to get guest info \"%s\".",
			  guest_info_param);
		return -ENOMEM;
	}

	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM))
		goto out_open;

	if (vmw_send_msg(&channel, msg) ||
	    vmw_recv_msg(&channel, (void *) &reply, &reply_len))
		goto out_msg;

	vmw_close_channel(&channel);
	if (buffer && reply && reply_len > 0) {
		/* Remove reply code, which are the first 2 characters of
		 * the reply
		 */
		reply_len = max(reply_len - 2, (size_t) 0);
		reply_len = min(reply_len, *length);

		if (reply_len > 0)
			memcpy(buffer, reply + 2, reply_len);
	}

	*length = reply_len;

	kfree(reply);
	kfree(msg);

	return 0;

out_msg:
	vmw_close_channel(&channel);
	kfree(reply);
out_open:
	*length = 0;
	kfree(msg);
	DRM_ERROR("Failed to get guest info \"%s\".", guest_info_param);

	return -EINVAL;
}


/**
 * vmw_host_log: Sends a log message to the host
 *
 * @log: NULL terminated string
 *
 * Returns: 0 on success
 */
int vmw_host_log(const char *log)
{
	struct rpc_channel channel;
	char *msg;
	int ret = 0;


	if (!vmw_msg_enabled)
		return -ENODEV;

	if (!log)
		return ret;

	msg = kasprintf(GFP_KERNEL, "log %s", log);
	if (!msg) {
		DRM_ERROR("Cannot allocate memory for host log message.\n");
		return -ENOMEM;
	}

	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM))
		goto out_open;

	if (vmw_send_msg(&channel, msg))
		goto out_msg;

	vmw_close_channel(&channel);
	kfree(msg);

	return 0;

out_msg:
	vmw_close_channel(&channel);
out_open:
	kfree(msg);
	DRM_ERROR("Failed to send host log message.\n");

	return -EINVAL;
}
Commit	Line	Data
dff96888	1	// SPDX-License-Identifier: GPL-2.0 OR MIT
89da76fd	2	/*
dff96888	3	* Copyright 2016 VMware, Inc., Palo Alto, CA., USA
89da76fd SY	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the
	7	* "Software"), to deal in the Software without restriction, including
	8	* without limitation the rights to use, copy, modify, merge, publish,
	9	* distribute, sub license, and/or sell copies of the Software, and to
	10	* permit persons to whom the Software is furnished to do so, subject to
	11	* the following conditions:
	12	*
	13	* The above copyright notice and this permission notice (including the
	14	* next paragraph) shall be included in all copies or substantial portions
	15	* of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	20	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	21	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	22	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	23	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	24	*
	25	*/
	26
	27
	28	#include <linux/slab.h>
	29	#include <linux/module.h>
	30	#include <linux/kernel.h>
0b0d81e3	31	#include <linux/frame.h>
89da76fd	32	#include <asm/hypervisor.h>
008be682	33	#include <drm/drmP.h>
6ff67ae7	34	#include "vmwgfx_drv.h"
89da76fd SY	35	#include "vmwgfx_msg.h"
	36
	37
	38	#define MESSAGE_STATUS_SUCCESS 0x0001
	39	#define MESSAGE_STATUS_DORECV 0x0002
	40	#define MESSAGE_STATUS_CPT 0x0010
	41	#define MESSAGE_STATUS_HB 0x0080
	42
	43	#define RPCI_PROTOCOL_NUM 0x49435052
	44	#define GUESTMSG_FLAG_COOKIE 0x80000000
	45
	46	#define RETRIES 3
	47
	48	#define VMW_HYPERVISOR_MAGIC 0x564D5868
	49	#define VMW_HYPERVISOR_PORT 0x5658
	50	#define VMW_HYPERVISOR_HB_PORT 0x5659
	51
	52	#define VMW_PORT_CMD_MSG 30
	53	#define VMW_PORT_CMD_HB_MSG 0
	54	#define VMW_PORT_CMD_OPEN_CHANNEL (MSG_TYPE_OPEN << 16 \| VMW_PORT_CMD_MSG)
	55	#define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 \| VMW_PORT_CMD_MSG)
	56	#define VMW_PORT_CMD_SENDSIZE (MSG_TYPE_SENDSIZE << 16 \| VMW_PORT_CMD_MSG)
	57	#define VMW_PORT_CMD_RECVSIZE (MSG_TYPE_RECVSIZE << 16 \| VMW_PORT_CMD_MSG)
	58	#define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 \| VMW_PORT_CMD_MSG)
	59
	60	#define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16)
	61
	62	static u32 vmw_msg_enabled = 1;
	63
	64	enum rpc_msg_type {
	65	MSG_TYPE_OPEN,
	66	MSG_TYPE_SENDSIZE,
	67	MSG_TYPE_SENDPAYLOAD,
	68	MSG_TYPE_RECVSIZE,
	69	MSG_TYPE_RECVPAYLOAD,
	70	MSG_TYPE_RECVSTATUS,
	71	MSG_TYPE_CLOSE,
	72	};
	73
	74	struct rpc_channel {
	75	u16 channel_id;
	76	u32 cookie_high;
	77	u32 cookie_low;
	78	};
	79
	80
	81
	82	/**
	83	* vmw_open_channel
	84	*
	85	* @channel: RPC channel
	86	* @protocol:
	87	*
	88	* Returns: 0 on success
	89	*/
	90	static int vmw_open_channel(struct rpc_channel *channel, unsigned int protocol)
	91	{
	92	unsigned long eax, ebx, ecx, edx, si = 0, di = 0;
	93
	94	VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL,
	95	(protocol \| GUESTMSG_FLAG_COOKIE), si, di,
	96	VMW_HYPERVISOR_PORT,
	97	VMW_HYPERVISOR_MAGIC,
	98	eax, ebx, ecx, edx, si, di);
99
100	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
101	return -EINVAL;
102
103	channel->channel_id = HIGH_WORD(edx);
104	channel->cookie_high = si;
105	channel->cookie_low = di;
106
107	return 0;
108	}
109
110
111
112	/**
113	* vmw_close_channel
114	*
115	* @channel: RPC channel
116	*
117	* Returns: 0 on success
118	*/
119	static int vmw_close_channel(struct rpc_channel *channel)
120	{
121	unsigned long eax, ebx, ecx, edx, si, di;
122
123	/* Set up additional parameters */
124	si = channel->cookie_high;
125	di = channel->cookie_low;
126
127	VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL,
128	0, si, di,
129	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
130	VMW_HYPERVISOR_MAGIC,
131	eax, ebx, ecx, edx, si, di);
132
133	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
134	return -EINVAL;
135
136	return 0;
137	}
138
139
140
141	/**
142	* vmw_send_msg: Sends a message to the host
143	*
144	* @channel: RPC channel
145	* @logmsg: NULL terminated string
146	*
147	* Returns: 0 on success
148	*/
149	static int vmw_send_msg(struct rpc_channel channel, const char msg)
150	{
151	unsigned long eax, ebx, ecx, edx, si, di, bp;
152	size_t msg_len = strlen(msg);
153	int retries = 0;
154
155
156	while (retries < RETRIES) {
157	retries++;
158
159	/* Set up additional parameters */
160	si = channel->cookie_high;
161	di = channel->cookie_low;
162
163	VMW_PORT(VMW_PORT_CMD_SENDSIZE,
164	msg_len, si, di,
165	VMW_HYPERVISOR_PORT \| (channel->channel_id << 16),
166	VMW_HYPERVISOR_MAGIC,
167	eax, ebx, ecx, edx, si, di);
168
169	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 \|\|
170	(HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
171	/* Expected success + high-bandwidth. Give up. */
172	return -EINVAL;
173	}
174
175	/* Send msg */
176	si = (uintptr_t) msg;
177	di = channel->cookie_low;
178	bp = channel->cookie_high;
179
180	VMW_PORT_HB_OUT(
181	(MESSAGE_STATUS_SUCCESS << 16) \| VMW_PORT_CMD_HB_MSG,
182	msg_len, si, di,
183	VMW_HYPERVISOR_HB_PORT \| (channel->channel_id << 16),
184	VMW_HYPERVISOR_MAGIC, bp,
185	eax, ebx, ecx, edx, si, di);
186
187	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) != 0) {
188	return 0;
189	} else if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
190	/* A checkpoint occurred. Retry. */
191	continue;
192	} else {
193	break;
194	}
195	}
196
197	return -EINVAL;
198	}
0b0d81e3	199	STACK_FRAME_NON_STANDARD(vmw_send_msg);
89da76fd SY	200
	201
	202	/**
	203	* vmw_recv_msg: Receives a message from the host
	204	*
	205	* Note: It is the caller's responsibility to call kfree() on msg.
	206	*
	207	* @channel: channel opened by vmw_open_channel
	208	* @msg: [OUT] message received from the host
	209	* @msg_len: message length
	210	*/
	211	static int vmw_recv_msg(struct rpc_channel channel, void *msg,
	212	size_t *msg_len)
	213	{
	214	unsigned long eax, ebx, ecx, edx, si, di, bp;
	215	char *reply;
	216	size_t reply_len;
	217	int retries = 0;
	218
	219
	220	*msg_len = 0;
	221	*msg = NULL;
	222
	223	while (retries < RETRIES) {
	224	retries++;
	225
	226	/* Set up additional parameters */
	227	si = channel->cookie_high;
	228	di = channel->cookie_low;
	229
	230	VMW_PORT(VMW_PORT_CMD_RECVSIZE,
	231	0, si, di,
	232	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
	233	VMW_HYPERVISOR_MAGIC,
	234	eax, ebx, ecx, edx, si, di);
	235
	236	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 \|\|
	237	(HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
3fbeccf8	238	DRM_ERROR("Failed to get reply size for host message.\n");
89da76fd SY	239	return -EINVAL;
	240	}
	241
	242	/* No reply available. This is okay. */
	243	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_DORECV) == 0)
	244	return 0;
	245
	246	reply_len = ebx;
	247	reply = kzalloc(reply_len + 1, GFP_KERNEL);
1a4adb05	248	if (!reply) {
3fbeccf8	249	DRM_ERROR("Cannot allocate memory for host message reply.\n");
89da76fd SY	250	return -ENOMEM;
	251	}
	252
	253
	254	/* Receive buffer */
	255	si = channel->cookie_high;
	256	di = (uintptr_t) reply;
	257	bp = channel->cookie_low;
	258
	259	VMW_PORT_HB_IN(
	260	(MESSAGE_STATUS_SUCCESS << 16) \| VMW_PORT_CMD_HB_MSG,
	261	reply_len, si, di,
	262	VMW_HYPERVISOR_HB_PORT \| (channel->channel_id << 16),
	263	VMW_HYPERVISOR_MAGIC, bp,
	264	eax, ebx, ecx, edx, si, di);
	265
	266	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) == 0) {
	267	kfree(reply);
	268
	269	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
	270	/* A checkpoint occurred. Retry. */
	271	continue;
	272	}
	273
	274	return -EINVAL;
	275	}
	276
	277	reply[reply_len] = '\0';
	278
	279
	280	/* Ack buffer */
	281	si = channel->cookie_high;
	282	di = channel->cookie_low;
	283
	284	VMW_PORT(VMW_PORT_CMD_RECVSTATUS,
	285	MESSAGE_STATUS_SUCCESS, si, di,
	286	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
	287	VMW_HYPERVISOR_MAGIC,
	288	eax, ebx, ecx, edx, si, di);
	289
	290	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) {
	291	kfree(reply);
	292
	293	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_CPT) != 0) {
	294	/* A checkpoint occurred. Retry. */
	295	continue;
	296	}
	297
	298	return -EINVAL;
	299	}
	300
	301	break;
	302	}
	303
a9cd9c04 SY	304	if (retries == RETRIES)
	305	return -EINVAL;
	306
89da76fd SY	307	*msg_len = reply_len;
	308	*msg = reply;
	309
	310	return 0;
	311	}
0b0d81e3	312	STACK_FRAME_NON_STANDARD(vmw_recv_msg);
89da76fd SY	313
	314
	315	/**
	316	* vmw_host_get_guestinfo: Gets a GuestInfo parameter
	317	*
	318	* Gets the value of a GuestInfo.* parameter. The value returned will be in
	319	* a string, and it is up to the caller to post-process.
	320	*
	321	* @guest_info_param: Parameter to get, e.g. GuestInfo.svga.gl3
	322	* @buffer: if NULL, *reply_len will contain reply size.
	323	* @length: size of the reply_buf. Set to size of reply upon return
	324	*
	325	* Returns: 0 on success
	326	*/
	327	int vmw_host_get_guestinfo(const char *guest_info_param,
	328	char buffer, size_t length)
	329	{
	330	struct rpc_channel channel;
	331	char msg, reply = NULL;
6073a092	332	size_t reply_len = 0;
89da76fd SY	333
	334	if (!vmw_msg_enabled)
	335	return -ENODEV;
	336
	337	if (!guest_info_param \|\| !length)
	338	return -EINVAL;
	339
6073a092	340	msg = kasprintf(GFP_KERNEL, "info-get %s", guest_info_param);
1a4adb05	341	if (!msg) {
3fbeccf8 TH	342	DRM_ERROR("Cannot allocate memory to get guest info \"%s\".",
3fbeccf8 TH	343	guest_info_param);
89da76fd SY	344	return -ENOMEM;
	345	}
	346
f37230c0 TH	347	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM))
f37230c0 TH	348	goto out_open;
89da76fd	349
f37230c0 TH	350	if (vmw_send_msg(&channel, msg) \|\|
	351	vmw_recv_msg(&channel, (void *) &reply, &reply_len))
	352	goto out_msg;
89da76fd	353
f37230c0	354	vmw_close_channel(&channel);
89da76fd SY	355	if (buffer && reply && reply_len > 0) {
	356	/* Remove reply code, which are the first 2 characters of
	357	* the reply
	358	*/
	359	reply_len = max(reply_len - 2, (size_t) 0);
	360	reply_len = min(reply_len, *length);
	361
	362	if (reply_len > 0)
	363	memcpy(buffer, reply + 2, reply_len);
	364	}
	365
	366	*length = reply_len;
	367
	368	kfree(reply);
	369	kfree(msg);
	370
f37230c0 TH	371	return 0;
	372
	373	out_msg:
	374	vmw_close_channel(&channel);
	375	kfree(reply);
	376	out_open:
	377	*length = 0;
	378	kfree(msg);
3fbeccf8	379	DRM_ERROR("Failed to get guest info \"%s\".", guest_info_param);
f37230c0 TH	380
f37230c0 TH	381	return -EINVAL;
89da76fd SY	382	}
	383
	384
	385
	386	/**
	387	* vmw_host_log: Sends a log message to the host
	388	*
	389	* @log: NULL terminated string
	390	*
	391	* Returns: 0 on success
	392	*/
	393	int vmw_host_log(const char *log)
	394	{
	395	struct rpc_channel channel;
	396	char *msg;
89da76fd SY	397	int ret = 0;
	398
	399
	400	if (!vmw_msg_enabled)
	401	return -ENODEV;
	402
	403	if (!log)
	404	return ret;
	405
6073a092	406	msg = kasprintf(GFP_KERNEL, "log %s", log);
1a4adb05	407	if (!msg) {
3fbeccf8	408	DRM_ERROR("Cannot allocate memory for host log message.\n");
89da76fd SY	409	return -ENOMEM;
	410	}
	411
f37230c0 TH	412	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM))
f37230c0 TH	413	goto out_open;
89da76fd	414
f37230c0 TH	415	if (vmw_send_msg(&channel, msg))
f37230c0 TH	416	goto out_msg;
89da76fd	417
f37230c0	418	vmw_close_channel(&channel);
89da76fd SY	419	kfree(msg);
89da76fd SY	420
f37230c0 TH	421	return 0;
	422
	423	out_msg:
	424	vmw_close_channel(&channel);
	425	out_open:
	426	kfree(msg);
3fbeccf8	427	DRM_ERROR("Failed to send host log message.\n");
f37230c0 TH	428
f37230c0 TH	429	return -EINVAL;
89da76fd	430	}