[deliverable/linux.git] / drivers / gpu / drm / vmwgfx / vmwgfx_msg.c

/*
 * Copyright © 2016 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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 "drmP.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\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 == NULL) {
			DRM_ERROR("Cannot allocate memory for 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 msg_len, reply_len = 0;
	int ret = 0;


	if (!vmw_msg_enabled)
		return -ENODEV;

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

	msg_len = strlen(guest_info_param) + strlen("info-get ") + 1;
	msg = kzalloc(msg_len, GFP_KERNEL);
	if (msg == NULL) {
		DRM_ERROR("Cannot allocate memory to get %s", guest_info_param);
		return -ENOMEM;
	}

	sprintf(msg, "info-get %s", guest_info_param);

	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) ||
	    vmw_send_msg(&channel, msg) ||
	    vmw_recv_msg(&channel, (void *) &reply, &reply_len) ||
	    vmw_close_channel(&channel)) {
		DRM_ERROR("Failed to get %s", guest_info_param);

		ret = -EINVAL;
	}

	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 ret;
}


/**
 * 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 msg_len;
	int ret = 0;


	if (!vmw_msg_enabled)
		return -ENODEV;

	if (!log)
		return ret;

	msg_len = strlen(log) + strlen("log ") + 1;
	msg = kzalloc(msg_len, GFP_KERNEL);
	if (msg == NULL) {
		DRM_ERROR("Cannot allocate memory for log message\n");
		return -ENOMEM;
	}

	sprintf(msg, "log %s", log);

	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) ||
	    vmw_send_msg(&channel, msg) ||
	    vmw_close_channel(&channel)) {
		DRM_ERROR("Failed to send log\n");

		ret = -EINVAL;
	}

	kfree(msg);

	return ret;
}
Commit	Line	Data
89da76fd SY	1	/*
	2	* Copyright © 2016 VMware, Inc., Palo Alto, CA., USA
	3	* All Rights Reserved.
	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 SY	32	#include <asm/hypervisor.h>
	33	#include "drmP.h"
	34	#include "vmwgfx_msg.h"
	35
	36
	37	#define MESSAGE_STATUS_SUCCESS 0x0001
	38	#define MESSAGE_STATUS_DORECV 0x0002
	39	#define MESSAGE_STATUS_CPT 0x0010
	40	#define MESSAGE_STATUS_HB 0x0080
	41
	42	#define RPCI_PROTOCOL_NUM 0x49435052
	43	#define GUESTMSG_FLAG_COOKIE 0x80000000
	44
	45	#define RETRIES 3
	46
	47	#define VMW_HYPERVISOR_MAGIC 0x564D5868
	48	#define VMW_HYPERVISOR_PORT 0x5658
	49	#define VMW_HYPERVISOR_HB_PORT 0x5659
	50
	51	#define VMW_PORT_CMD_MSG 30
	52	#define VMW_PORT_CMD_HB_MSG 0
	53	#define VMW_PORT_CMD_OPEN_CHANNEL (MSG_TYPE_OPEN << 16 \| VMW_PORT_CMD_MSG)
	54	#define VMW_PORT_CMD_CLOSE_CHANNEL (MSG_TYPE_CLOSE << 16 \| VMW_PORT_CMD_MSG)
	55	#define VMW_PORT_CMD_SENDSIZE (MSG_TYPE_SENDSIZE << 16 \| VMW_PORT_CMD_MSG)
	56	#define VMW_PORT_CMD_RECVSIZE (MSG_TYPE_RECVSIZE << 16 \| VMW_PORT_CMD_MSG)
	57	#define VMW_PORT_CMD_RECVSTATUS (MSG_TYPE_RECVSTATUS << 16 \| VMW_PORT_CMD_MSG)
	58
	59	#define HIGH_WORD(X) ((X & 0xFFFF0000) >> 16)
	60
	61	static u32 vmw_msg_enabled = 1;
	62
	63	enum rpc_msg_type {
	64	MSG_TYPE_OPEN,
	65	MSG_TYPE_SENDSIZE,
	66	MSG_TYPE_SENDPAYLOAD,
	67	MSG_TYPE_RECVSIZE,
	68	MSG_TYPE_RECVPAYLOAD,
	69	MSG_TYPE_RECVSTATUS,
	70	MSG_TYPE_CLOSE,
	71	};
	72
	73	struct rpc_channel {
	74	u16 channel_id;
	75	u32 cookie_high;
	76	u32 cookie_low;
	77	};
	78
	79
	80
	81	/**
	82	* vmw_open_channel
	83	*
	84	* @channel: RPC channel
	85	* @protocol:
	86	*
	87	* Returns: 0 on success
	88	*/
	89	static int vmw_open_channel(struct rpc_channel *channel, unsigned int protocol)
	90	{
	91	unsigned long eax, ebx, ecx, edx, si = 0, di = 0;
	92
	93	VMW_PORT(VMW_PORT_CMD_OPEN_CHANNEL,
	94	(protocol \| GUESTMSG_FLAG_COOKIE), si, di,
	95	VMW_HYPERVISOR_PORT,
96	VMW_HYPERVISOR_MAGIC,
97	eax, ebx, ecx, edx, si, di);
98
99	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
100	return -EINVAL;
101
102	channel->channel_id = HIGH_WORD(edx);
103	channel->cookie_high = si;
104	channel->cookie_low = di;
105
106	return 0;
107	}
108
109
110
111	/**
112	* vmw_close_channel
113	*
114	* @channel: RPC channel
115	*
116	* Returns: 0 on success
117	*/
118	static int vmw_close_channel(struct rpc_channel *channel)
119	{
120	unsigned long eax, ebx, ecx, edx, si, di;
121
122	/* Set up additional parameters */
123	si = channel->cookie_high;
124	di = channel->cookie_low;
125
126	VMW_PORT(VMW_PORT_CMD_CLOSE_CHANNEL,
127	0, si, di,
128	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
129	VMW_HYPERVISOR_MAGIC,
130	eax, ebx, ecx, edx, si, di);
131
132	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0)
133	return -EINVAL;
134
135	return 0;
136	}
137
138
139
140	/**
141	* vmw_send_msg: Sends a message to the host
142	*
143	* @channel: RPC channel
144	* @logmsg: NULL terminated string
145	*
146	* Returns: 0 on success
147	*/
148	static int vmw_send_msg(struct rpc_channel channel, const char msg)
149	{
150	unsigned long eax, ebx, ecx, edx, si, di, bp;
151	size_t msg_len = strlen(msg);
152	int retries = 0;
153
154
155	while (retries < RETRIES) {
156	retries++;
157
158	/* Set up additional parameters */
159	si = channel->cookie_high;
160	di = channel->cookie_low;
161
162	VMW_PORT(VMW_PORT_CMD_SENDSIZE,
163	msg_len, si, di,
164	VMW_HYPERVISOR_PORT \| (channel->channel_id << 16),
165	VMW_HYPERVISOR_MAGIC,
166	eax, ebx, ecx, edx, si, di);
167
168	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 \|\|
169	(HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
170	/* Expected success + high-bandwidth. Give up. */
171	return -EINVAL;
172	}
173
174	/* Send msg */
175	si = (uintptr_t) msg;
176	di = channel->cookie_low;
177	bp = channel->cookie_high;
178
179	VMW_PORT_HB_OUT(
180	(MESSAGE_STATUS_SUCCESS << 16) \| VMW_PORT_CMD_HB_MSG,
181	msg_len, si, di,
182	VMW_HYPERVISOR_HB_PORT \| (channel->channel_id << 16),
183	VMW_HYPERVISOR_MAGIC, bp,
184	eax, ebx, ecx, edx, si, di);
185
186	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) != 0) {
187	return 0;
188	} else if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
189	/* A checkpoint occurred. Retry. */
190	continue;
191	} else {
192	break;
193	}
194	}
195
196	return -EINVAL;
197	}
0b0d81e3	198	STACK_FRAME_NON_STANDARD(vmw_send_msg);
89da76fd SY	199
	200
	201	/**
	202	* vmw_recv_msg: Receives a message from the host
	203	*
	204	* Note: It is the caller's responsibility to call kfree() on msg.
	205	*
	206	* @channel: channel opened by vmw_open_channel
	207	* @msg: [OUT] message received from the host
	208	* @msg_len: message length
	209	*/
	210	static int vmw_recv_msg(struct rpc_channel channel, void *msg,
	211	size_t *msg_len)
	212	{
	213	unsigned long eax, ebx, ecx, edx, si, di, bp;
	214	char *reply;
	215	size_t reply_len;
	216	int retries = 0;
	217
	218
	219	*msg_len = 0;
	220	*msg = NULL;
	221
	222	while (retries < RETRIES) {
	223	retries++;
	224
	225	/* Set up additional parameters */
	226	si = channel->cookie_high;
	227	di = channel->cookie_low;
	228
	229	VMW_PORT(VMW_PORT_CMD_RECVSIZE,
	230	0, si, di,
	231	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
	232	VMW_HYPERVISOR_MAGIC,
	233	eax, ebx, ecx, edx, si, di);
	234
	235	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0 \|\|
	236	(HIGH_WORD(ecx) & MESSAGE_STATUS_HB) == 0) {
	237	DRM_ERROR("Failed to get reply size\n");
	238	return -EINVAL;
	239	}
	240
	241	/* No reply available. This is okay. */
	242	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_DORECV) == 0)
	243	return 0;
	244
	245	reply_len = ebx;
	246	reply = kzalloc(reply_len + 1, GFP_KERNEL);
	247	if (reply == NULL) {
	248	DRM_ERROR("Cannot allocate memory for reply\n");
	249	return -ENOMEM;
	250	}
	251
	252
	253	/* Receive buffer */
	254	si = channel->cookie_high;
	255	di = (uintptr_t) reply;
	256	bp = channel->cookie_low;
	257
	258	VMW_PORT_HB_IN(
	259	(MESSAGE_STATUS_SUCCESS << 16) \| VMW_PORT_CMD_HB_MSG,
	260	reply_len, si, di,
	261	VMW_HYPERVISOR_HB_PORT \| (channel->channel_id << 16),
	262	VMW_HYPERVISOR_MAGIC, bp,
263	eax, ebx, ecx, edx, si, di);
264
265	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_SUCCESS) == 0) {
266	kfree(reply);
267
268	if ((HIGH_WORD(ebx) & MESSAGE_STATUS_CPT) != 0) {
269	/* A checkpoint occurred. Retry. */
270	continue;
271	}
272
273	return -EINVAL;
274	}
275
276	reply[reply_len] = '\0';
277
278
279	/* Ack buffer */
280	si = channel->cookie_high;
281	di = channel->cookie_low;
282
283	VMW_PORT(VMW_PORT_CMD_RECVSTATUS,
284	MESSAGE_STATUS_SUCCESS, si, di,
285	(VMW_HYPERVISOR_PORT \| (channel->channel_id << 16)),
286	VMW_HYPERVISOR_MAGIC,
287	eax, ebx, ecx, edx, si, di);
288
289	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_SUCCESS) == 0) {
290	kfree(reply);
291
292	if ((HIGH_WORD(ecx) & MESSAGE_STATUS_CPT) != 0) {
293	/* A checkpoint occurred. Retry. */
294	continue;
295	}
296
297	return -EINVAL;
298	}
299
300	break;
301	}
302
a9cd9c04 SY	303	if (retries == RETRIES)
	304	return -EINVAL;
	305
89da76fd SY	306	*msg_len = reply_len;
	307	*msg = reply;
	308
	309	return 0;
	310	}
0b0d81e3	311	STACK_FRAME_NON_STANDARD(vmw_recv_msg);
89da76fd SY	312
	313
	314	/**
	315	* vmw_host_get_guestinfo: Gets a GuestInfo parameter
	316	*
	317	* Gets the value of a GuestInfo.* parameter. The value returned will be in
	318	* a string, and it is up to the caller to post-process.
	319	*
	320	* @guest_info_param: Parameter to get, e.g. GuestInfo.svga.gl3
	321	* @buffer: if NULL, *reply_len will contain reply size.
	322	* @length: size of the reply_buf. Set to size of reply upon return
	323	*
	324	* Returns: 0 on success
	325	*/
	326	int vmw_host_get_guestinfo(const char *guest_info_param,
	327	char buffer, size_t length)
	328	{
	329	struct rpc_channel channel;
	330	char msg, reply = NULL;
	331	size_t msg_len, reply_len = 0;
	332	int ret = 0;
	333
	334
	335	if (!vmw_msg_enabled)
	336	return -ENODEV;
	337
	338	if (!guest_info_param \|\| !length)
	339	return -EINVAL;
	340
	341	msg_len = strlen(guest_info_param) + strlen("info-get ") + 1;
	342	msg = kzalloc(msg_len, GFP_KERNEL);
	343	if (msg == NULL) {
	344	DRM_ERROR("Cannot allocate memory to get %s", guest_info_param);
	345	return -ENOMEM;
	346	}
	347
	348	sprintf(msg, "info-get %s", guest_info_param);
	349
	350	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) \|\|
	351	vmw_send_msg(&channel, msg) \|\|
	352	vmw_recv_msg(&channel, (void *) &reply, &reply_len) \|\|
	353	vmw_close_channel(&channel)) {
	354	DRM_ERROR("Failed to get %s", guest_info_param);
	355
	356	ret = -EINVAL;
	357	}
	358
	359	if (buffer && reply && reply_len > 0) {
	360	/* Remove reply code, which are the first 2 characters of
	361	* the reply
	362	*/
	363	reply_len = max(reply_len - 2, (size_t) 0);
	364	reply_len = min(reply_len, *length);
	365
	366	if (reply_len > 0)
	367	memcpy(buffer, reply + 2, reply_len);
	368	}
	369
	370	*length = reply_len;
	371
	372	kfree(reply);
	373	kfree(msg);
	374
	375	return ret;
376	}
377
378
379
380	/**
381	* vmw_host_log: Sends a log message to the host
382	*
383	* @log: NULL terminated string
384	*
385	* Returns: 0 on success
386	*/
387	int vmw_host_log(const char *log)
388	{
389	struct rpc_channel channel;
390	char *msg;
391	int msg_len;
392	int ret = 0;
393
394
395	if (!vmw_msg_enabled)
396	return -ENODEV;
397
398	if (!log)
399	return ret;
400
401	msg_len = strlen(log) + strlen("log ") + 1;
402	msg = kzalloc(msg_len, GFP_KERNEL);
403	if (msg == NULL) {
404	DRM_ERROR("Cannot allocate memory for log message\n");
405	return -ENOMEM;
406	}
407
408	sprintf(msg, "log %s", log);
409
410	if (vmw_open_channel(&channel, RPCI_PROTOCOL_NUM) \|\|
411	vmw_send_msg(&channel, msg) \|\|
412	vmw_close_channel(&channel)) {
413	DRM_ERROR("Failed to send log\n");
414
415	ret = -EINVAL;
416	}
417
418	kfree(msg);
419
420	return ret;
421	}