diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_msg.c')
-rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 416 |
1 files changed, 416 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c new file mode 100644 index 0000000..6de283c --- /dev/null +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c @@ -0,0 +1,416 @@ +/* + * 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 <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; +} + + + +/** + * 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; + } + + *msg_len = reply_len; + *msg = reply; + + return 0; +} + + +/** + * 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; +} |