[PATCH 02/15] hyperv: uapi-fy synic event flags definitions
Roman Kagan
rkagan at virtuozzo.com
Tue Dec 20 15:55:49 UTC 2016
Move definitions related to the Hyper-V SynIC event flags to a header
where they can be consumed by userspace.
While doing so, also clean up their use by switching to standard bitops
and struct-based dereferencing. The latter is also done for message
pages.
Signed-off-by: Roman Kagan <rkagan at virtuozzo.com>
---
arch/x86/include/uapi/asm/hyperv.h | 13 +++++++++
drivers/hv/hyperv_vmbus.h | 24 ++--------------
drivers/hv/channel_mgmt.c | 10 +++----
drivers/hv/connection.c | 47 ++++++++++---------------------
drivers/hv/vmbus_drv.c | 57 ++++++++++++++------------------------
5 files changed, 54 insertions(+), 97 deletions(-)
diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h
index 6098ab5..af542a3 100644
--- a/arch/x86/include/uapi/asm/hyperv.h
+++ b/arch/x86/include/uapi/asm/hyperv.h
@@ -363,4 +363,17 @@ struct hv_timer_message_payload {
#define HV_STIMER_AUTOENABLE (1ULL << 3)
#define HV_STIMER_SINT(config) (__u8)(((config) >> 16) & 0x0F)
+/* Define synthetic interrupt controller flag constants. */
+#define HV_EVENT_FLAGS_COUNT (256 * 8)
+
+/* Define the synthetic interrupt controller event flags format. */
+struct hv_synic_event_flags {
+ __u64 flags[HV_EVENT_FLAGS_COUNT / 64];
+};
+
+/* Define the synthetic interrupt flags page layout. */
+struct hv_synic_event_flags_page {
+ struct hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
+};
+
#endif
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 4516498..4fab154 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -26,7 +26,6 @@
#define _HYPERV_VMBUS_H
#include <linux/list.h>
-#include <asm/sync_bitops.h>
#include <linux/atomic.h>
#include <linux/hyperv.h>
@@ -75,11 +74,6 @@ enum hv_cpuid_function {
#define HV_ANY_VP (0xFFFFFFFF)
-/* Define synthetic interrupt controller flag constants. */
-#define HV_EVENT_FLAGS_COUNT (256 * 8)
-#define HV_EVENT_FLAGS_BYTE_COUNT (256)
-#define HV_EVENT_FLAGS_DWORD_COUNT (256 / sizeof(u32))
-
/* Define invalid partition identifier. */
#define HV_PARTITION_ID_INVALID ((u64)0x0)
@@ -146,20 +140,6 @@ union hv_timer_config {
};
};
-/* Define the number of message buffers associated with each port. */
-#define HV_PORT_MESSAGE_BUFFER_COUNT (16)
-
-/* Define the synthetic interrupt controller event flags format. */
-union hv_synic_event_flags {
- u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
- u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
-};
-
-/* Define the synthetic interrupt flags page layout. */
-struct hv_synic_event_flags_page {
- union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
-};
-
/* Define SynIC control register. */
union hv_synic_scontrol {
u64 as_uint64;
@@ -434,8 +414,8 @@ struct hv_context {
bool synic_initialized;
- void *synic_message_page[NR_CPUS];
- void *synic_event_page[NR_CPUS];
+ struct hv_message_page *synic_message_page[NR_CPUS];
+ struct hv_synic_event_flags_page *synic_event_page[NR_CPUS];
/*
* Hypervisor's notion of virtual processor ID is different from
* Linux' notion of CPU ID. This information can only be retrieved
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 26b4192..49eaae2 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -654,7 +654,6 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type)
static void vmbus_wait_for_unload(void)
{
int cpu;
- void *page_addr;
struct hv_message *msg;
struct vmbus_channel_message_header *hdr;
u32 message_type;
@@ -673,9 +672,8 @@ static void vmbus_wait_for_unload(void)
break;
for_each_online_cpu(cpu) {
- page_addr = hv_context.synic_message_page[cpu];
- msg = (struct hv_message *)page_addr +
- VMBUS_MESSAGE_SINT;
+ msg = &hv_context.synic_message_page[cpu]->
+ sint_message[VMBUS_MESSAGE_SINT];
message_type = READ_ONCE(msg->header.message_type);
if (message_type == HVMSG_NONE)
@@ -699,8 +697,8 @@ static void vmbus_wait_for_unload(void)
* messages after we reconnect.
*/
for_each_online_cpu(cpu) {
- page_addr = hv_context.synic_message_page[cpu];
- msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
+ msg = &hv_context.synic_message_page[cpu]->
+ sint_message[VMBUS_MESSAGE_SINT];
msg->header.message_type = HVMSG_NONE;
}
}
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 6ce8b87..aaa2103 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -381,17 +381,12 @@ static void process_chn_event(u32 relid)
*/
void vmbus_on_event(unsigned long data)
{
- u32 dword;
- u32 maxdword;
- int bit;
- u32 relid;
- u32 *recv_int_page = NULL;
- void *page_addr;
+ u32 relid, max_relid;
+ unsigned long *recv_int_page;
int cpu = smp_processor_id();
- union hv_synic_event_flags *event;
if (vmbus_proto_version < VERSION_WIN8) {
- maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
+ max_relid = MAX_NUM_CHANNELS_SUPPORTED;
recv_int_page = vmbus_connection.recv_int_page;
} else {
/*
@@ -399,36 +394,22 @@ void vmbus_on_event(unsigned long data)
* can be directly checked to get the id of the channel
* that has the interrupt pending.
*/
- maxdword = HV_EVENT_FLAGS_DWORD_COUNT;
- page_addr = hv_context.synic_event_page[cpu];
- event = (union hv_synic_event_flags *)page_addr +
- VMBUS_MESSAGE_SINT;
- recv_int_page = event->flags32;
+ struct hv_synic_event_flags *event =
+ &hv_context.synic_event_page[cpu]->
+ sintevent_flags[VMBUS_MESSAGE_SINT];
+ max_relid = HV_EVENT_FLAGS_COUNT;
+ recv_int_page = (unsigned long *)event->flags;
}
-
-
/* Check events */
if (!recv_int_page)
return;
- for (dword = 0; dword < maxdword; dword++) {
- if (!recv_int_page[dword])
- continue;
- for (bit = 0; bit < 32; bit++) {
- if (sync_test_and_clear_bit(bit,
- (unsigned long *)&recv_int_page[dword])) {
- relid = (dword << 5) + bit;
-
- if (relid == 0)
- /*
- * Special case - vmbus
- * channel protocol msg
- */
- continue;
-
- process_chn_event(relid);
- }
- }
+
+ /* relid == 0 is vmbus channel protocol msg */
+ relid = 1;
+ for_each_set_bit_from(relid, recv_int_page, max_relid) {
+ clear_bit(relid, recv_int_page);
+ process_chn_event(relid);
}
}
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 230c62e..13dd210 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -872,9 +872,8 @@ static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
void vmbus_on_msg_dpc(unsigned long data)
{
int cpu = smp_processor_id();
- void *page_addr = hv_context.synic_message_page[cpu];
- struct hv_message *msg = (struct hv_message *)page_addr +
- VMBUS_MESSAGE_SINT;
+ struct hv_message *msg = &hv_context.synic_message_page[cpu]->
+ sint_message[VMBUS_MESSAGE_SINT];
struct vmbus_channel_message_header *hdr;
struct vmbus_channel_message_table_entry *entry;
struct onmessage_work_context *ctx;
@@ -911,54 +910,40 @@ void vmbus_on_msg_dpc(unsigned long data)
static void vmbus_isr(void)
{
int cpu = smp_processor_id();
- void *page_addr;
struct hv_message *msg;
- union hv_synic_event_flags *event;
- bool handled = false;
+ struct hv_synic_event_flags *event;
- page_addr = hv_context.synic_event_page[cpu];
- if (page_addr == NULL)
+ if (!hv_context.synic_event_page[cpu])
return;
- event = (union hv_synic_event_flags *)page_addr +
- VMBUS_MESSAGE_SINT;
+ event = &hv_context.synic_event_page[cpu]->
+ sintevent_flags[VMBUS_MESSAGE_SINT];
/*
* Check for events before checking for messages. This is the order
* in which events and messages are checked in Windows guests on
* Hyper-V, and the Windows team suggested we do the same.
*/
- if ((vmbus_proto_version == VERSION_WS2008) ||
- (vmbus_proto_version == VERSION_WIN7)) {
-
+ /* On win8 and above the channel interrupts are signaled directly in
+ * the event page and will be checked in the .event_dpc
+ */
+ if (vmbus_proto_version >= VERSION_WIN8 ||
/* Since we are a child, we only need to check bit 0 */
- if (sync_test_and_clear_bit(0,
- (unsigned long *) &event->flags32[0])) {
- handled = true;
- }
- } else {
- /*
- * Our host is win8 or above. The signaling mechanism
- * has changed and we can directly look at the event page.
- * If bit n is set then we have an interrup on the channel
- * whose id is n.
- */
- handled = true;
- }
-
- if (handled)
+ test_and_clear_bit(0, (unsigned long *)event->flags))
tasklet_schedule(hv_context.event_dpc[cpu]);
-
- page_addr = hv_context.synic_message_page[cpu];
- msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
+ msg = &hv_context.synic_message_page[cpu]->
+ sint_message[VMBUS_MESSAGE_SINT];
/* Check if there are actual msgs to be processed */
- if (msg->header.message_type != HVMSG_NONE) {
- if (msg->header.message_type == HVMSG_TIMER_EXPIRED)
- hv_process_timer_expiration(msg, cpu);
- else
- tasklet_schedule(hv_context.msg_dpc[cpu]);
+ switch (READ_ONCE(msg->header.message_type)) {
+ case HVMSG_NONE:
+ break;
+ case HVMSG_TIMER_EXPIRED:
+ hv_process_timer_expiration(msg, cpu);
+ break;
+ default:
+ tasklet_schedule(hv_context.msg_dpc[cpu]);
}
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
--
2.9.3
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