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-rw-r--r--drivers/hv/channel_mgmt.c21
-rw-r--r--drivers/hv/hv_balloon.c13
-rw-r--r--drivers/hv/hv_fcopy.c54
-rw-r--r--drivers/hv/hv_kvp.c43
-rw-r--r--drivers/hv/hv_snapshot.c55
-rw-r--r--drivers/hv/hv_util.c148
-rw-r--r--drivers/hv/hyperv_vmbus.h6
-rw-r--r--drivers/hv/vmbus_drv.c4
-rw-r--r--drivers/input/serio/hyperv-keyboard.c27
-rw-r--r--drivers/video/fbdev/Kconfig1
-rw-r--r--drivers/video/fbdev/hyperv_fb.c184
-rw-r--r--include/linux/hyperv.h4
-rw-r--r--tools/hv/hv_fcopy_daemon.c37
-rw-r--r--tools/hv/hv_kvp_daemon.c36
-rw-r--r--tools/hv/hv_vss_daemon.c49
15 files changed, 574 insertions, 108 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 8eb167540b4f..0370364169c4 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -1351,6 +1351,8 @@ channel_message_table[CHANNELMSG_COUNT] = {
{ CHANNELMSG_19, 0, NULL },
{ CHANNELMSG_20, 0, NULL },
{ CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL },
+ { CHANNELMSG_22, 0, NULL },
+ { CHANNELMSG_TL_CONNECT_RESULT, 0, NULL },
};
/*
@@ -1362,25 +1364,16 @@ void vmbus_onmessage(void *context)
{
struct hv_message *msg = context;
struct vmbus_channel_message_header *hdr;
- int size;
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
- size = msg->header.payload_size;
trace_vmbus_on_message(hdr);
- if (hdr->msgtype >= CHANNELMSG_COUNT) {
- pr_err("Received invalid channel message type %d size %d\n",
- hdr->msgtype, size);
- print_hex_dump_bytes("", DUMP_PREFIX_NONE,
- (unsigned char *)msg->u.payload, size);
- return;
- }
-
- if (channel_message_table[hdr->msgtype].message_handler)
- channel_message_table[hdr->msgtype].message_handler(hdr);
- else
- pr_err("Unhandled channel message type %d\n", hdr->msgtype);
+ /*
+ * vmbus_on_msg_dpc() makes sure the hdr->msgtype here can not go
+ * out of bound and the message_handler pointer can not be NULL.
+ */
+ channel_message_table[hdr->msgtype].message_handler(hdr);
}
/*
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index b155d0052981..a02ce43d778d 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1217,10 +1217,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
unsigned int i, j;
struct page *pg;
- if (num_pages < alloc_unit)
- return 0;
-
- for (i = 0; (i * alloc_unit) < num_pages; i++) {
+ for (i = 0; i < num_pages / alloc_unit; i++) {
if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) >
HV_HYP_PAGE_SIZE)
return i * alloc_unit;
@@ -1258,7 +1255,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
}
- return num_pages;
+ return i * alloc_unit;
}
static void balloon_up(struct work_struct *dummy)
@@ -1273,9 +1270,6 @@ static void balloon_up(struct work_struct *dummy)
long avail_pages;
unsigned long floor;
- /* The host balloons pages in 2M granularity. */
- WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0);
-
/*
* We will attempt 2M allocations. However, if we fail to
* allocate 2M chunks, we will go back to PAGE_SIZE allocations.
@@ -1285,14 +1279,13 @@ static void balloon_up(struct work_struct *dummy)
avail_pages = si_mem_available();
floor = compute_balloon_floor();
- /* Refuse to balloon below the floor, keep the 2M granularity. */
+ /* Refuse to balloon below the floor. */
if (avail_pages < num_pages || avail_pages - num_pages < floor) {
pr_warn("Balloon request will be partially fulfilled. %s\n",
avail_pages < num_pages ? "Not enough memory." :
"Balloon floor reached.");
num_pages = avail_pages > floor ? (avail_pages - floor) : 0;
- num_pages -= num_pages % PAGES_IN_2M;
}
while (!done) {
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index 08fa4a5de644..bb9ba3f7c794 100644
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -346,9 +346,61 @@ int hv_fcopy_init(struct hv_util_service *srv)
return 0;
}
+static void hv_fcopy_cancel_work(void)
+{
+ cancel_delayed_work_sync(&fcopy_timeout_work);
+ cancel_work_sync(&fcopy_send_work);
+}
+
+int hv_fcopy_pre_suspend(void)
+{
+ struct vmbus_channel *channel = fcopy_transaction.recv_channel;
+ struct hv_fcopy_hdr *fcopy_msg;
+
+ /*
+ * Fake a CANCEL_FCOPY message for the user space daemon in case the
+ * daemon is in the middle of copying some file. It doesn't matter if
+ * there is already a message pending to be delivered to the user
+ * space since we force fcopy_transaction.state to be HVUTIL_READY, so
+ * the user space daemon's write() will fail with EINVAL (see
+ * fcopy_on_msg()), and the daemon will reset the device by closing
+ * and re-opening it.
+ */
+ fcopy_msg = kzalloc(sizeof(*fcopy_msg), GFP_KERNEL);
+ if (!fcopy_msg)
+ return -ENOMEM;
+
+ tasklet_disable(&channel->callback_event);
+
+ fcopy_msg->operation = CANCEL_FCOPY;
+
+ hv_fcopy_cancel_work();
+
+ /* We don't care about the return value. */
+ hvutil_transport_send(hvt, fcopy_msg, sizeof(*fcopy_msg), NULL);
+
+ kfree(fcopy_msg);
+
+ fcopy_transaction.state = HVUTIL_READY;
+
+ /* tasklet_enable() will be called in hv_fcopy_pre_resume(). */
+ return 0;
+}
+
+int hv_fcopy_pre_resume(void)
+{
+ struct vmbus_channel *channel = fcopy_transaction.recv_channel;
+
+ tasklet_enable(&channel->callback_event);
+
+ return 0;
+}
+
void hv_fcopy_deinit(void)
{
fcopy_transaction.state = HVUTIL_DEVICE_DYING;
- cancel_delayed_work_sync(&fcopy_timeout_work);
+
+ hv_fcopy_cancel_work();
+
hvutil_transport_destroy(hvt);
}
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index ae7c028dc5a8..e74b144b8f3d 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -758,11 +758,50 @@ hv_kvp_init(struct hv_util_service *srv)
return 0;
}
-void hv_kvp_deinit(void)
+static void hv_kvp_cancel_work(void)
{
- kvp_transaction.state = HVUTIL_DEVICE_DYING;
cancel_delayed_work_sync(&kvp_host_handshake_work);
cancel_delayed_work_sync(&kvp_timeout_work);
cancel_work_sync(&kvp_sendkey_work);
+}
+
+int hv_kvp_pre_suspend(void)
+{
+ struct vmbus_channel *channel = kvp_transaction.recv_channel;
+
+ tasklet_disable(&channel->callback_event);
+
+ /*
+ * If there is a pending transtion, it's unnecessary to tell the host
+ * that the transaction will fail, because that is implied when
+ * util_suspend() calls vmbus_close() later.
+ */
+ hv_kvp_cancel_work();
+
+ /*
+ * Forece the state to READY to handle the ICMSGTYPE_NEGOTIATE message
+ * later. The user space daemon may go out of order and its write()
+ * may fail with EINVAL: this doesn't matter since the daemon will
+ * reset the device by closing and re-opening it.
+ */
+ kvp_transaction.state = HVUTIL_READY;
+ return 0;
+}
+
+int hv_kvp_pre_resume(void)
+{
+ struct vmbus_channel *channel = kvp_transaction.recv_channel;
+
+ tasklet_enable(&channel->callback_event);
+
+ return 0;
+}
+
+void hv_kvp_deinit(void)
+{
+ kvp_transaction.state = HVUTIL_DEVICE_DYING;
+
+ hv_kvp_cancel_work();
+
hvutil_transport_destroy(hvt);
}
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 03b6454268b3..1c75b38f0d6d 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -379,10 +379,61 @@ hv_vss_init(struct hv_util_service *srv)
return 0;
}
-void hv_vss_deinit(void)
+static void hv_vss_cancel_work(void)
{
- vss_transaction.state = HVUTIL_DEVICE_DYING;
cancel_delayed_work_sync(&vss_timeout_work);
cancel_work_sync(&vss_handle_request_work);
+}
+
+int hv_vss_pre_suspend(void)
+{
+ struct vmbus_channel *channel = vss_transaction.recv_channel;
+ struct hv_vss_msg *vss_msg;
+
+ /*
+ * Fake a THAW message for the user space daemon in case the daemon
+ * has frozen the file systems. It doesn't matter if there is already
+ * a message pending to be delivered to the user space since we force
+ * vss_transaction.state to be HVUTIL_READY, so the user space daemon's
+ * write() will fail with EINVAL (see vss_on_msg()), and the daemon
+ * will reset the device by closing and re-opening it.
+ */
+ vss_msg = kzalloc(sizeof(*vss_msg), GFP_KERNEL);
+ if (!vss_msg)
+ return -ENOMEM;
+
+ tasklet_disable(&channel->callback_event);
+
+ vss_msg->vss_hdr.operation = VSS_OP_THAW;
+
+ /* Cancel any possible pending work. */
+ hv_vss_cancel_work();
+
+ /* We don't care about the return value. */
+ hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg), NULL);
+
+ kfree(vss_msg);
+
+ vss_transaction.state = HVUTIL_READY;
+
+ /* tasklet_enable() will be called in hv_vss_pre_resume(). */
+ return 0;
+}
+
+int hv_vss_pre_resume(void)
+{
+ struct vmbus_channel *channel = vss_transaction.recv_channel;
+
+ tasklet_enable(&channel->callback_event);
+
+ return 0;
+}
+
+void hv_vss_deinit(void)
+{
+ vss_transaction.state = HVUTIL_DEVICE_DYING;
+
+ hv_vss_cancel_work();
+
hvutil_transport_destroy(hvt);
}
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 296f9098c9e4..92ee0fe4c919 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -24,6 +24,10 @@
#define SD_MAJOR 3
#define SD_MINOR 0
+#define SD_MINOR_1 1
+#define SD_MINOR_2 2
+#define SD_VERSION_3_1 (SD_MAJOR << 16 | SD_MINOR_1)
+#define SD_VERSION_3_2 (SD_MAJOR << 16 | SD_MINOR_2)
#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
#define SD_MAJOR_1 1
@@ -50,8 +54,10 @@ static int sd_srv_version;
static int ts_srv_version;
static int hb_srv_version;
-#define SD_VER_COUNT 2
+#define SD_VER_COUNT 4
static const int sd_versions[] = {
+ SD_VERSION_3_2,
+ SD_VERSION_3_1,
SD_VERSION,
SD_VERSION_1
};
@@ -75,18 +81,56 @@ static const int fw_versions[] = {
UTIL_WS2K8_FW_VERSION
};
+/*
+ * Send the "hibernate" udev event in a thread context.
+ */
+struct hibernate_work_context {
+ struct work_struct work;
+ struct hv_device *dev;
+};
+
+static struct hibernate_work_context hibernate_context;
+static bool hibernation_supported;
+
+static void send_hibernate_uevent(struct work_struct *work)
+{
+ char *uevent_env[2] = { "EVENT=hibernate", NULL };
+ struct hibernate_work_context *ctx;
+
+ ctx = container_of(work, struct hibernate_work_context, work);
+
+ kobject_uevent_env(&ctx->dev->device.kobj, KOBJ_CHANGE, uevent_env);
+
+ pr_info("Sent hibernation uevent\n");
+}
+
+static int hv_shutdown_init(struct hv_util_service *srv)
+{
+ struct vmbus_channel *channel = srv->channel;
+
+ INIT_WORK(&hibernate_context.work, send_hibernate_uevent);
+ hibernate_context.dev = channel->device_obj;
+
+ hibernation_supported = hv_is_hibernation_supported();
+
+ return 0;
+}
+
static void shutdown_onchannelcallback(void *context);
static struct hv_util_service util_shutdown = {
.util_cb = shutdown_onchannelcallback,
+ .util_init = hv_shutdown_init,
};
static int hv_timesync_init(struct hv_util_service *srv);
+static int hv_timesync_pre_suspend(void);
static void hv_timesync_deinit(void);
static void timesync_onchannelcallback(void *context);
static struct hv_util_service util_timesynch = {
.util_cb = timesync_onchannelcallback,
.util_init = hv_timesync_init,
+ .util_pre_suspend = hv_timesync_pre_suspend,
.util_deinit = hv_timesync_deinit,
};
@@ -98,18 +142,24 @@ static struct hv_util_service util_heartbeat = {
static struct hv_util_service util_kvp = {
.util_cb = hv_kvp_onchannelcallback,
.util_init = hv_kvp_init,
+ .util_pre_suspend = hv_kvp_pre_suspend,
+ .util_pre_resume = hv_kvp_pre_resume,
.util_deinit = hv_kvp_deinit,
};
static struct hv_util_service util_vss = {
.util_cb = hv_vss_onchannelcallback,
.util_init = hv_vss_init,
+ .util_pre_suspend = hv_vss_pre_suspend,
+ .util_pre_resume = hv_vss_pre_resume,
.util_deinit = hv_vss_deinit,
};
static struct hv_util_service util_fcopy = {
.util_cb = hv_fcopy_onchannelcallback,
.util_init = hv_fcopy_init,
+ .util_pre_suspend = hv_fcopy_pre_suspend,
+ .util_pre_resume = hv_fcopy_pre_resume,
.util_deinit = hv_fcopy_deinit,
};
@@ -118,17 +168,27 @@ static void perform_shutdown(struct work_struct *dummy)
orderly_poweroff(true);
}
+static void perform_restart(struct work_struct *dummy)
+{
+ orderly_reboot();
+}
+
/*
* Perform the shutdown operation in a thread context.
*/
static DECLARE_WORK(shutdown_work, perform_shutdown);
+/*
+ * Perform the restart operation in a thread context.
+ */
+static DECLARE_WORK(restart_work, perform_restart);
+
static void shutdown_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
+ struct work_struct *work = NULL;
u32 recvlen;
u64 requestid;
- bool execute_shutdown = false;
u8 *shut_txf_buf = util_shutdown.recv_buffer;
struct shutdown_msg_data *shutdown_msg;
@@ -157,19 +217,37 @@ static void shutdown_onchannelcallback(void *context)
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
+ /*
+ * shutdown_msg->flags can be 0(shut down), 2(reboot),
+ * or 4(hibernate). It may bitwise-OR 1, which means
+ * performing the request by force. Linux always tries
+ * to perform the request by force.
+ */
switch (shutdown_msg->flags) {
case 0:
case 1:
icmsghdrp->status = HV_S_OK;
- execute_shutdown = true;
-
+ work = &shutdown_work;
pr_info("Shutdown request received -"
" graceful shutdown initiated\n");
break;
+ case 2:
+ case 3:
+ icmsghdrp->status = HV_S_OK;
+ work = &restart_work;
+ pr_info("Restart request received -"
+ " graceful restart initiated\n");
+ break;
+ case 4:
+ case 5:
+ pr_info("Hibernation request received\n");
+ icmsghdrp->status = hibernation_supported ?
+ HV_S_OK : HV_E_FAIL;
+ if (hibernation_supported)
+ work = &hibernate_context.work;
+ break;
default:
icmsghdrp->status = HV_E_FAIL;
- execute_shutdown = false;
-
pr_info("Shutdown request received -"
" Invalid request\n");
break;
@@ -184,8 +262,8 @@ static void shutdown_onchannelcallback(void *context)
VM_PKT_DATA_INBAND, 0);
}
- if (execute_shutdown == true)
- schedule_work(&shutdown_work);
+ if (work)
+ schedule_work(work);
}
/*
@@ -441,6 +519,44 @@ static int util_remove(struct hv_device *dev)
return 0;
}
+/*
+ * When we're in util_suspend(), all the userspace processes have been frozen
+ * (refer to hibernate() -> freeze_processes()). The userspace is thawed only
+ * after the whole resume procedure, including util_resume(), finishes.
+ */
+static int util_suspend(struct hv_device *dev)
+{
+ struct hv_util_service *srv = hv_get_drvdata(dev);
+ int ret = 0;
+
+ if (srv->util_pre_suspend) {
+ ret = srv->util_pre_suspend();
+ if (ret)
+ return ret;
+ }
+
+ vmbus_close(dev->channel);
+
+ return 0;
+}
+
+static int util_resume(struct hv_device *dev)
+{
+ struct hv_util_service *srv = hv_get_drvdata(dev);
+ int ret = 0;
+
+ if (srv->util_pre_resume) {
+ ret = srv->util_pre_resume();
+ if (ret)
+ return ret;
+ }
+
+ ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE,
+ 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb,
+ dev->channel);
+ return ret;
+}
+
static const struct hv_vmbus_device_id id_table[] = {
/* Shutdown guid */
{ HV_SHUTDOWN_GUID,
@@ -477,6 +593,8 @@ static struct hv_driver util_drv = {
.id_table = id_table,
.probe = util_probe,
.remove = util_remove,
+ .suspend = util_suspend,
+ .resume = util_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
@@ -546,11 +664,23 @@ static int hv_timesync_init(struct hv_util_service *srv)
return 0;
}
+static void hv_timesync_cancel_work(void)
+{
+ cancel_work_sync(&adj_time_work);
+}
+
+static int hv_timesync_pre_suspend(void)
+{
+ hv_timesync_cancel_work();
+ return 0;
+}
+
static void hv_timesync_deinit(void)
{
if (hv_ptp_clock)
ptp_clock_unregister(hv_ptp_clock);
- cancel_work_sync(&adj_time_work);
+
+ hv_timesync_cancel_work();
}
static int __init init_hyperv_utils(void)
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 20edcfd3b96c..f5fa3b3c9baf 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -352,14 +352,20 @@ void vmbus_on_msg_dpc(unsigned long data);
int hv_kvp_init(struct hv_util_service *srv);
void hv_kvp_deinit(void);
+int hv_kvp_pre_suspend(void);
+int hv_kvp_pre_resume(void);
void hv_kvp_onchannelcallback(void *context);
int hv_vss_init(struct hv_util_service *srv);
void hv_vss_deinit(void);
+int hv_vss_pre_suspend(void);
+int hv_vss_pre_resume(void);
void hv_vss_onchannelcallback(void *context);
int hv_fcopy_init(struct hv_util_service *srv);
void hv_fcopy_deinit(void);
+int hv_fcopy_pre_suspend(void);
+int hv_fcopy_pre_resume(void);
void hv_fcopy_onchannelcallback(void *context);
void vmbus_initiate_unload(bool crash);
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 4ef5a66df680..029378c27421 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1033,6 +1033,10 @@ void vmbus_on_msg_dpc(unsigned long data)
}
entry = &channel_message_table[hdr->msgtype];
+
+ if (!entry->message_handler)
+ goto msg_handled;
+
if (entry->handler_type == VMHT_BLOCKING) {
ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
if (ctx == NULL)
diff --git a/drivers/input/serio/hyperv-keyboard.c b/drivers/input/serio/hyperv-keyboard.c
index e486a8a74c40..df4e9f6f4529 100644
--- a/drivers/input/serio/hyperv-keyboard.c
+++ b/drivers/input/serio/hyperv-keyboard.c
@@ -259,6 +259,8 @@ static int hv_kbd_connect_to_vsp(struct hv_device *hv_dev)
u32 proto_status;
int error;
+ reinit_completion(&kbd_dev->wait_event);
+
request = &kbd_dev->protocol_req;
memset(request, 0, sizeof(struct synth_kbd_protocol_request));
request->header.type = __cpu_to_le32(SYNTH_KBD_PROTOCOL_REQUEST);
@@ -380,6 +382,29 @@ static int hv_kbd_remove(struct hv_device *hv_dev)
return 0;
}
+static int hv_kbd_suspend(struct hv_device *hv_dev)
+{
+ vmbus_close(hv_dev->channel);
+
+ return 0;
+}
+
+static int hv_kbd_resume(struct hv_device *hv_dev)
+{
+ int ret;
+
+ ret = vmbus_open(hv_dev->channel,
+ KBD_VSC_SEND_RING_BUFFER_SIZE,
+ KBD_VSC_RECV_RING_BUFFER_SIZE,
+ NULL, 0,
+ hv_kbd_on_channel_callback,
+ hv_dev);
+ if (ret == 0)
+ ret = hv_kbd_connect_to_vsp(hv_dev);
+
+ return ret;
+}
+
static const struct hv_vmbus_device_id id_table[] = {
/* Keyboard guid */
{ HV_KBD_GUID, },
@@ -393,6 +418,8 @@ static struct hv_driver hv_kbd_drv = {
.id_table = id_table,
.probe = hv_kbd_probe,
.remove = hv_kbd_remove,
+ .suspend = hv_kbd_suspend,
+ .resume = hv_kbd_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index aa9541bf964b..f65991a67af2 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -2215,6 +2215,7 @@ config FB_HYPERV
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
select FB_DEFERRED_IO
+ select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA
help
This framebuffer driver supports Microsoft Hyper-V Synthetic Video.
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index afe9fd751cd5..f47d50e560c0 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -31,6 +31,16 @@
* "set-vmvideo" command. For example
* set-vmvideo -vmname name -horizontalresolution:1920 \
* -verticalresolution:1200 -resolutiontype single
+ *
+ * Gen 1 VMs also support direct using VM's physical memory for framebuffer.
+ * It could improve the efficiency and performance for framebuffer and VM.
+ * This requires to allocate contiguous physical memory from Linux kernel's
+ * CMA memory allocator. To enable this, supply a kernel parameter to give
+ * enough memory space to CMA allocator for framebuffer. For example:
+ * cma=130m
+ * This gives 130MB memory to CMA allocator that can be allocated to
+ * framebuffer. For reference, 8K resolution (7680x4320) takes about
+ * 127MB memory.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -228,7 +238,6 @@ struct synthvid_msg {
} __packed;
-
/* FB driver definitions and structures */
#define HVFB_WIDTH 1152 /* default screen width */
#define HVFB_HEIGHT 864 /* default screen height */
@@ -258,12 +267,15 @@ struct hvfb_par {
/* If true, the VSC notifies the VSP on every framebuffer change */
bool synchronous_fb;
+ /* If true, need to copy from deferred IO mem to framebuffer mem */
+ bool need_docopy;
+
struct notifier_block hvfb_panic_nb;
/* Memory for deferred IO and frame buffer itself */
unsigned char *dio_vp;
unsigned char *mmio_vp;
- unsigned long mmio_pp;
+ phys_addr_t mmio_pp;
/* Dirty rectangle, protected by delayed_refresh_lock */
int x1, y1, x2, y2;
@@ -434,7 +446,7 @@ static void synthvid_deferred_io(struct fb_info *p,
maxy = max_t(int, maxy, y2);
/* Copy from dio space to mmio address */
- if (par->fb_ready)
+ if (par->fb_ready && par->need_docopy)
hvfb_docopy(par, start, PAGE_SIZE);
}
@@ -751,12 +763,12 @@ static void hvfb_update_work(struct work_struct *w)
return;
/* Copy the dirty rectangle to frame buffer memory */
- for (j = y1; j < y2; j++) {
- hvfb_docopy(par,
- j * info->fix.line_length +
- (x1 * screen_depth / 8),
- (x2 - x1) * screen_depth / 8);
- }
+ if (par->need_docopy)
+ for (j = y1; j < y2; j++)
+ hvfb_docopy(par,
+ j * info->fix.line_length +
+ (x1 * screen_depth / 8),
+ (x2 - x1) * screen_depth / 8);
/* Refresh */
if (par->fb_ready && par->update)
@@ -801,7 +813,8 @@ static int hvfb_on_panic(struct notifier_block *nb,
par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
par->synchronous_fb = true;
info = par->info;
- hvfb_docopy(par, 0, dio_fb_size);
+ if (par->need_docopy)
+ hvfb_docopy(par, 0, dio_fb_size);
synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
return NOTIFY_DONE;
@@ -940,6 +953,62 @@ static void hvfb_get_option(struct fb_info *info)
return;
}
+/*
+ * Allocate enough contiguous physical memory.
+ * Return physical address if succeeded or -1 if failed.
+ */
+static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
+ unsigned int request_size)
+{
+ struct page *page = NULL;
+ dma_addr_t dma_handle;
+ void *vmem;
+ phys_addr_t paddr = 0;
+ unsigned int order = get_order(request_size);
+
+ if (request_size == 0)
+ return -1;
+
+ if (order < MAX_ORDER) {
+ /* Call alloc_pages if the size is less than 2^MAX_ORDER */
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!page)
+ return -1;
+
+ paddr = (page_to_pfn(page) << PAGE_SHIFT);
+ } else {
+ /* Allocate from CMA */
+ hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
+
+ vmem = dma_alloc_coherent(&hdev->device,
+ round_up(request_size, PAGE_SIZE),
+ &dma_handle,
+ GFP_KERNEL | __GFP_NOWARN);
+
+ if (!vmem)
+ return -1;
+
+ paddr = virt_to_phys(vmem);
+ }
+
+ return paddr;
+}
+
+/* Release contiguous physical memory */
+static void hvfb_release_phymem(struct hv_device *hdev,
+ phys_addr_t paddr, unsigned int size)
+{
+ unsigned int order = get_order(size);
+
+ if (order < MAX_ORDER)
+ __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
+ else
+ dma_free_coherent(&hdev->device,
+ round_up(size, PAGE_SIZE),
+ phys_to_virt(paddr),
+ paddr);
+}
+
/* Get framebuffer memory from Hyper-V video pci space */
static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
@@ -949,22 +1018,61 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
void __iomem *fb_virt;
int gen2vm = efi_enabled(EFI_BOOT);
resource_size_t pot_start, pot_end;
+ phys_addr_t paddr;
int ret;
- dio_fb_size =
- screen_width * screen_height * screen_depth / 8;
+ info->apertures = alloc_apertures(1);
+ if (!info->apertures)
+ return -ENOMEM;
- if (gen2vm) {
- pot_start = 0;
- pot_end = -1;
- } else {
+ if (!gen2vm) {
pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
- PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
+ PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
if (!pdev) {
pr_err("Unable to find PCI Hyper-V video\n");
+ kfree(info->apertures);
return -ENODEV;
}
+ info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
+ info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
+
+ /*
+ * For Gen 1 VM, we can directly use the contiguous memory
+ * from VM. If we succeed, deferred IO happens directly
+ * on this allocated framebuffer memory, avoiding extra
+ * memory copy.
+ */
+ paddr = hvfb_get_phymem(hdev, screen_fb_size);
+ if (paddr != (phys_addr_t) -1) {
+ par->mmio_pp = paddr;
+ par->mmio_vp = par->dio_vp = __va(paddr);
+
+ info->fix.smem_start = paddr;
+ info->fix.smem_len = screen_fb_size;
+ info->screen_base = par->mmio_vp;
+ info->screen_size = screen_fb_size;
+
+ par->need_docopy = false;
+ goto getmem_done;
+ }
+ pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n");
+ } else {
+ info->apertures->ranges[0].base = screen_info.lfb_base;
+ info->apertures->ranges[0].size = screen_info.lfb_size;
+ }
+
+ /*
+ * Cannot use the contiguous physical memory.
+ * Allocate mmio space for framebuffer.
+ */
+ dio_fb_size =
+ screen_width * screen_height * screen_depth / 8;
+
+ if (gen2vm) {
+ pot_start = 0;
+ pot_end = -1;
+ } else {
if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
pci_resource_len(pdev, 0) < screen_fb_size) {
pr_err("Resource not available or (0x%lx < 0x%lx)\n",
@@ -993,20 +1101,6 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
if (par->dio_vp == NULL)
goto err3;
- info->apertures = alloc_apertures(1);
- if (!info->apertures)
- goto err4;
-
- if (gen2vm) {
- info->apertures->ranges[0].base = screen_info.lfb_base;
- info->apertures->ranges[0].size = screen_info.lfb_size;
- remove_conflicting_framebuffers(info->apertures,
- KBUILD_MODNAME, false);
- } else {
- info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
- info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
- }
-
/* Physical address of FB device */
par->mmio_pp = par->mem->start;
/* Virtual address of FB device */
@@ -1017,13 +1111,15 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
info->screen_base = par->dio_vp;
info->screen_size = dio_fb_size;
+getmem_done:
+ remove_conflicting_framebuffers(info->apertures,
+ KBUILD_MODNAME, false);
if (!gen2vm)
pci_dev_put(pdev);
+ kfree(info->apertures);
return 0;
-err4:
- vfree(par->dio_vp);
err3:
iounmap(fb_virt);
err2:
@@ -1032,18 +1128,25 @@ err2:
err1:
if (!gen2vm)
pci_dev_put(pdev);
+ kfree(info->apertures);
return -ENOMEM;
}
/* Release the framebuffer */
-static void hvfb_putmem(struct fb_info *info)
+static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info)
{
struct hvfb_par *par = info->par;
- vfree(par->dio_vp);
- iounmap(info->screen_base);
- vmbus_free_mmio(par->mem->start, screen_fb_size);
+ if (par->need_docopy) {
+ vfree(par->dio_vp);
+ iounmap(info->screen_base);
+ vmbus_free_mmio(par->mem->start, screen_fb_size);
+ } else {
+ hvfb_release_phymem(hdev, info->fix.smem_start,
+ screen_fb_size);
+ }
+
par->mem = NULL;
}
@@ -1062,6 +1165,7 @@ static int hvfb_probe(struct hv_device *hdev,
par = info->par;
par->info = info;
par->fb_ready = false;
+ par->need_docopy = true;
init_completion(&par->wait);
INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
@@ -1147,7 +1251,7 @@ static int hvfb_probe(struct hv_device *hdev,
error:
fb_deferred_io_cleanup(info);
- hvfb_putmem(info);
+ hvfb_putmem(hdev, info);
error2:
vmbus_close(hdev->channel);
error1:
@@ -1177,7 +1281,7 @@ static int hvfb_remove(struct hv_device *hdev)
vmbus_close(hdev->channel);
hv_set_drvdata(hdev, NULL);
- hvfb_putmem(info);
+ hvfb_putmem(hdev, info);
framebuffer_release(info);
return 0;
@@ -1194,6 +1298,7 @@ static int hvfb_suspend(struct hv_device *hdev)
fb_set_suspend(info, 1);
cancel_delayed_work_sync(&par->dwork);
+ cancel_delayed_work_sync(&info->deferred_work);
par->update_saved = par->update;
par->update = false;
@@ -1227,6 +1332,7 @@ static int hvfb_resume(struct hv_device *hdev)
par->fb_ready = true;
par->update = par->update_saved;
+ schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
/* 0 means do resume */
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 26f3aeeae1ca..692c89ccf5df 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -425,6 +425,8 @@ enum vmbus_channel_message_type {
CHANNELMSG_19 = 19,
CHANNELMSG_20 = 20,
CHANNELMSG_TL_CONNECT_REQUEST = 21,
+ CHANNELMSG_22 = 22,
+ CHANNELMSG_TL_CONNECT_RESULT = 23,
CHANNELMSG_COUNT
};
@@ -1433,6 +1435,8 @@ struct hv_util_service {
void (*util_cb)(void *);
int (*util_init)(struct hv_util_service *);
void (*util_deinit)(void);
+ int (*util_pre_suspend)(void);
+ int (*util_pre_resume)(void);
};
struct vmbuspipe_hdr {
diff --git a/tools/hv/hv_fcopy_daemon.c b/tools/hv/hv_fcopy_daemon.c
index aea2d91ab364..16d629b22c25 100644
--- a/tools/hv/hv_fcopy_daemon.c
+++ b/tools/hv/hv_fcopy_daemon.c
@@ -80,6 +80,8 @@ static int hv_start_fcopy(struct hv_start_fcopy *smsg)
error = 0;
done:
+ if (error)
+ target_fname[0] = '\0';
return error;
}
@@ -108,15 +110,29 @@ static int hv_copy_data(struct hv_do_fcopy *cpmsg)
return ret;
}
+/*
+ * Reset target_fname to "" in the two below functions for hibernation: if
+ * the fcopy operation is aborted by hibernation, the daemon should remove the
+ * partially-copied file; to achieve this, the hv_utils driver always fakes a
+ * CANCEL_FCOPY message upon suspend, and later when the VM resumes back,
+ * the daemon calls hv_copy_cancel() to remove the file; if a file is copied
+ * successfully before suspend, hv_copy_finished() must reset target_fname to
+ * avoid that the file can be incorrectly removed upon resume, since the faked
+ * CANCEL_FCOPY message is spurious in this case.
+ */
static int hv_copy_finished(void)
{
close(target_fd);
+ target_fname[0] = '\0';
return 0;
}
static int hv_copy_cancel(void)
{
close(target_fd);
- unlink(target_fname);
+ if (strlen(target_fname) > 0) {
+ unlink(target_fname);
+ target_fname[0] = '\0';
+ }
return 0;
}
@@ -131,7 +147,7 @@ void print_usage(char *argv[])
int main(int argc, char *argv[])
{
- int fcopy_fd;
+ int fcopy_fd = -1;
int error;
int daemonize = 1, long_index = 0, opt;
int version = FCOPY_CURRENT_VERSION;
@@ -141,7 +157,7 @@ int main(int argc, char *argv[])
struct hv_do_fcopy copy;
__u32 kernel_modver;
} buffer = { };
- int in_handshake = 1;
+ int in_handshake;
static struct option long_options[] = {
{"help", no_argument, 0, 'h' },
@@ -170,6 +186,12 @@ int main(int argc, char *argv[])
openlog("HV_FCOPY", 0, LOG_USER);
syslog(LOG_INFO, "starting; pid is:%d", getpid());
+reopen_fcopy_fd:
+ if (fcopy_fd != -1)
+ close(fcopy_fd);
+ /* Remove any possible partially-copied file on error */
+ hv_copy_cancel();
+ in_handshake = 1;
fcopy_fd = open("/dev/vmbus/hv_fcopy", O_RDWR);
if (fcopy_fd < 0) {
@@ -196,7 +218,7 @@ int main(int argc, char *argv[])
len = pread(fcopy_fd, &buffer, sizeof(buffer), 0);
if (len < 0) {
syslog(LOG_ERR, "pread failed: %s", strerror(errno));
- exit(EXIT_FAILURE);
+ goto reopen_fcopy_fd;
}
if (in_handshake) {
@@ -231,9 +253,14 @@ int main(int argc, char *argv[])
}
+ /*
+ * pwrite() may return an error due to the faked CANCEL_FCOPY
+ * message upon hibernation. Ignore the error by resetting the
+ * dev file, i.e. closing and re-opening it.
+ */
if (pwrite(fcopy_fd, &error, sizeof(int), 0) != sizeof(int)) {
syslog(LOG_ERR, "pwrite failed: %s", strerror(errno));
- exit(EXIT_FAILURE);
+ goto reopen_fcopy_fd;
}
}
}
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index e9ef4ca6a655..ee9c1bb2293e 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -76,7 +76,7 @@ enum {
DNS
};
-static int in_hand_shake = 1;
+static int in_hand_shake;
static char *os_name = "";
static char *os_major = "";
@@ -1360,7 +1360,7 @@ void print_usage(char *argv[])
int main(int argc, char *argv[])
{
- int kvp_fd, len;
+ int kvp_fd = -1, len;
int error;
struct pollfd pfd;
char *p;
@@ -1400,14 +1400,6 @@ int main(int argc, char *argv[])
openlog("KVP", 0, LOG_USER);
syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
- kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
-
- if (kvp_fd < 0) {
- syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
- errno, strerror(errno));
- exit(EXIT_FAILURE);
- }
-
/*
* Retrieve OS release information.
*/
@@ -1423,6 +1415,18 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
+reopen_kvp_fd:
+ if (kvp_fd != -1)
+ close(kvp_fd);
+ in_hand_shake = 1;
+ kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
+
+ if (kvp_fd < 0) {
+ syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
+ errno, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
/*
* Register ourselves with the kernel.
*/
@@ -1456,9 +1460,7 @@ int main(int argc, char *argv[])
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "read failed; error:%d %s",
errno, strerror(errno));
-
- close(kvp_fd);
- return EXIT_FAILURE;
+ goto reopen_kvp_fd;
}
/*
@@ -1617,13 +1619,17 @@ int main(int argc, char *argv[])
break;
}
- /* Send the value back to the kernel. */
+ /*
+ * Send the value back to the kernel. Note: the write() may
+ * return an error due to hibernation; we can ignore the error
+ * by resetting the dev file, i.e. closing and re-opening it.
+ */
kvp_done:
len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "write failed; error: %d %s", errno,
strerror(errno));
- exit(EXIT_FAILURE);
+ goto reopen_kvp_fd;
}
}
diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index 92902a88f671..dd111870beee 100644
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -28,6 +28,8 @@
#include <stdbool.h>
#include <dirent.h>
+static bool fs_frozen;
+
/* Don't use syslog() in the function since that can cause write to disk */
static int vss_do_freeze(char *dir, unsigned int cmd)
{
@@ -155,18 +157,27 @@ static int vss_operate(int operation)
continue;
}
error |= vss_do_freeze(ent->mnt_dir, cmd);
- if (error && operation == VSS_OP_FREEZE)
- goto err;
+ if (operation == VSS_OP_FREEZE) {
+ if (error)
+ goto err;
+ fs_frozen = true;
+ }
}
endmntent(mounts);
if (root_seen) {
error |= vss_do_freeze("/", cmd);
- if (error && operation == VSS_OP_FREEZE)
- goto err;
+ if (operation == VSS_OP_FREEZE) {
+ if (error)
+ goto err;
+ fs_frozen = true;
+ }
}
+ if (operation == VSS_OP_THAW && !error)
+ fs_frozen = false;
+
goto out;
err:
save_errno = errno;
@@ -175,6 +186,7 @@ err:
endmntent(mounts);
}
vss_operate(VSS_OP_THAW);
+ fs_frozen = false;
/* Call syslog after we thaw all filesystems */
if (ent)
syslog(LOG_ERR, "FREEZE of %s failed; error:%d %s",
@@ -196,13 +208,13 @@ void print_usage(char *argv[])
int main(int argc, char *argv[])
{
- int vss_fd, len;
+ int vss_fd = -1, len;
int error;
struct pollfd pfd;
int op;
struct hv_vss_msg vss_msg[1];
int daemonize = 1, long_index = 0, opt;
- int in_handshake = 1;
+ int in_handshake;
__u32 kernel_modver;
static struct option long_options[] = {
@@ -232,6 +244,18 @@ int main(int argc, char *argv[])
openlog("Hyper-V VSS", 0, LOG_USER);
syslog(LOG_INFO, "VSS starting; pid is:%d", getpid());
+reopen_vss_fd:
+ if (vss_fd != -1)
+ close(vss_fd);
+ if (fs_frozen) {
+ if (vss_operate(VSS_OP_THAW) || fs_frozen) {
+ syslog(LOG_ERR, "failed to thaw file system: err=%d",
+ errno);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ in_handshake = 1;
vss_fd = open("/dev/vmbus/hv_vss", O_RDWR);
if (vss_fd < 0) {
syslog(LOG_ERR, "open /dev/vmbus/hv_vss failed; error: %d %s",
@@ -284,8 +308,7 @@ int main(int argc, char *argv[])
if (len != sizeof(struct hv_vss_msg)) {
syslog(LOG_ERR, "read failed; error:%d %s",
errno, strerror(errno));
- close(vss_fd);
- return EXIT_FAILURE;
+ goto reopen_vss_fd;
}
op = vss_msg->vss_hdr.operation;
@@ -312,14 +335,18 @@ int main(int argc, char *argv[])
default:
syslog(LOG_ERR, "Illegal op:%d\n", op);
}
+
+ /*
+ * The write() may return an error due to the faked VSS_OP_THAW
+ * message upon hibernation. Ignore the error by resetting the
+ * dev file, i.e. closing and re-opening it.
+ */
vss_msg->error = error;
len = write(vss_fd, vss_msg, sizeof(struct hv_vss_msg));
if (len != sizeof(struct hv_vss_msg)) {
syslog(LOG_ERR, "write failed; error: %d %s", errno,
strerror(errno));
-
- if (op == VSS_OP_FREEZE)
- vss_operate(VSS_OP_THAW);
+ goto reopen_vss_fd;
}
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.