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path: root/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
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Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_msg.c')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_msg.c416
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 000000000000..6de283c8fa3e
--- /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;
+}
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