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path: root/drivers/hv/connection.c
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Diffstat (limited to 'drivers/hv/connection.c')
-rw-r--r--drivers/hv/connection.c99
1 files changed, 67 insertions, 32 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 253a74ba245..ae22e3c1fc4 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -55,6 +55,9 @@ static __u32 vmbus_get_next_version(__u32 current_version)
case (VERSION_WIN8):
return VERSION_WIN7;
+ case (VERSION_WIN8_1):
+ return VERSION_WIN8;
+
case (VERSION_WS2008):
default:
return VERSION_INVAL;
@@ -67,7 +70,6 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
int ret = 0;
struct vmbus_channel_initiate_contact *msg;
unsigned long flags;
- int t;
init_completion(&msginfo->waitevent);
@@ -76,10 +78,10 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
msg->vmbus_version_requested = version;
msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
- msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages);
- msg->monitor_page2 = virt_to_phys(
- (void *)((unsigned long)vmbus_connection.monitor_pages +
- PAGE_SIZE));
+ msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
+ msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
+ if (version == VERSION_WIN8_1)
+ msg->target_vcpu = hv_context.vp_index[smp_processor_id()];
/*
* Add to list before we send the request since we may
@@ -102,15 +104,7 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
}
/* Wait for the connection response */
- t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
- if (t == 0) {
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
- flags);
- list_del(&msginfo->msglistentry);
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
- flags);
- return -ETIMEDOUT;
- }
+ wait_for_completion(&msginfo->waitevent);
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_del(&msginfo->msglistentry);
@@ -169,9 +163,10 @@ int vmbus_connect(void)
* Setup the monitor notification facility. The 1st page for
* parent->child and the 2nd page for child->parent
*/
- vmbus_connection.monitor_pages =
- (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1);
- if (vmbus_connection.monitor_pages == NULL) {
+ vmbus_connection.monitor_pages[0] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
+ vmbus_connection.monitor_pages[1] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
+ if ((vmbus_connection.monitor_pages[0] == NULL) ||
+ (vmbus_connection.monitor_pages[1] == NULL)) {
ret = -ENOMEM;
goto cleanup;
}
@@ -195,7 +190,10 @@ int vmbus_connect(void)
do {
ret = vmbus_negotiate_version(msginfo, version);
- if (ret == 0)
+ if (ret == -ETIMEDOUT)
+ goto cleanup;
+
+ if (vmbus_connection.conn_state == CONNECTED)
break;
version = vmbus_get_next_version(version);
@@ -226,16 +224,38 @@ cleanup:
vmbus_connection.int_page = NULL;
}
- if (vmbus_connection.monitor_pages) {
- free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
- vmbus_connection.monitor_pages = NULL;
- }
+ free_pages((unsigned long)vmbus_connection.monitor_pages[0], 0);
+ free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0);
+ vmbus_connection.monitor_pages[0] = NULL;
+ vmbus_connection.monitor_pages[1] = NULL;
kfree(msginfo);
return ret;
}
+/*
+ * Map the given relid to the corresponding channel based on the
+ * per-cpu list of channels that have been affinitized to this CPU.
+ * This will be used in the channel callback path as we can do this
+ * mapping in a lock-free fashion.
+ */
+static struct vmbus_channel *pcpu_relid2channel(u32 relid)
+{
+ struct vmbus_channel *channel;
+ struct vmbus_channel *found_channel = NULL;
+ int cpu = smp_processor_id();
+ struct list_head *pcpu_head = &hv_context.percpu_list[cpu];
+
+ list_for_each_entry(channel, pcpu_head, percpu_list) {
+ if (channel->offermsg.child_relid == relid) {
+ found_channel = channel;
+ break;
+ }
+ }
+
+ return found_channel;
+}
/*
* relid2channel - Get the channel object given its
@@ -246,12 +266,26 @@ struct vmbus_channel *relid2channel(u32 relid)
struct vmbus_channel *channel;
struct vmbus_channel *found_channel = NULL;
unsigned long flags;
+ struct list_head *cur, *tmp;
+ struct vmbus_channel *cur_sc;
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
if (channel->offermsg.child_relid == relid) {
found_channel = channel;
break;
+ } else if (!list_empty(&channel->sc_list)) {
+ /*
+ * Deal with sub-channels.
+ */
+ list_for_each_safe(cur, tmp, &channel->sc_list) {
+ cur_sc = list_entry(cur, struct vmbus_channel,
+ sc_list);
+ if (cur_sc->offermsg.child_relid == relid) {
+ found_channel = cur_sc;
+ break;
+ }
+ }
}
}
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
@@ -265,7 +299,6 @@ struct vmbus_channel *relid2channel(u32 relid)
static void process_chn_event(u32 relid)
{
struct vmbus_channel *channel;
- unsigned long flags;
void *arg;
bool read_state;
u32 bytes_to_read;
@@ -274,7 +307,7 @@ static void process_chn_event(u32 relid)
* Find the channel based on this relid and invokes the
* channel callback to process the event
*/
- channel = relid2channel(relid);
+ channel = pcpu_relid2channel(relid);
if (!channel) {
pr_err("channel not found for relid - %u\n", relid);
@@ -284,13 +317,12 @@ static void process_chn_event(u32 relid)
/*
* A channel once created is persistent even when there
* is no driver handling the device. An unloading driver
- * sets the onchannel_callback to NULL under the
- * protection of the channel inbound_lock. Thus, checking
- * and invoking the driver specific callback takes care of
- * orderly unloading of the driver.
+ * sets the onchannel_callback to NULL on the same CPU
+ * as where this interrupt is handled (in an interrupt context).
+ * Thus, checking and invoking the driver specific callback takes
+ * care of orderly unloading of the driver.
*/
- spin_lock_irqsave(&channel->inbound_lock, flags);
if (channel->onchannel_callback != NULL) {
arg = channel->channel_callback_context;
read_state = channel->batched_reading;
@@ -307,15 +339,18 @@ static void process_chn_event(u32 relid)
*/
do {
- hv_begin_read(&channel->inbound);
+ if (read_state)
+ hv_begin_read(&channel->inbound);
channel->onchannel_callback(arg);
- bytes_to_read = hv_end_read(&channel->inbound);
+ if (read_state)
+ bytes_to_read = hv_end_read(&channel->inbound);
+ else
+ bytes_to_read = 0;
} while (read_state && (bytes_to_read != 0));
} else {
pr_err("no channel callback for relid - %u\n", relid);
}
- spin_unlock_irqrestore(&channel->inbound_lock, flags);
}
/*
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 23:06:03 +0000