vmbus: put related per-cpu variable together
The hv_context structure had several arrays which were per-cpu and was allocating small structures (tasklet_struct). Instead use a single per-cpu array. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger
Greg Kroah-Hartman
Родитель
51c6ce2ae3
Коммит
37cdd991fa
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@ -353,9 +353,10 @@ static void free_channel(struct vmbus_channel *channel)
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static void percpu_channel_enq(void *arg)
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{
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struct vmbus_channel *channel = arg;
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int cpu = smp_processor_id();
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struct hv_per_cpu_context *hv_cpu
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= this_cpu_ptr(hv_context.cpu_context);
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list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]);
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list_add_tail(&channel->percpu_list, &hv_cpu->chan_list);
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}
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static void percpu_channel_deq(void *arg)
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@ -379,19 +380,21 @@ static void vmbus_release_relid(u32 relid)
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void hv_event_tasklet_disable(struct vmbus_channel *channel)
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{
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struct tasklet_struct *tasklet;
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tasklet = hv_context.event_dpc[channel->target_cpu];
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tasklet_disable(tasklet);
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struct hv_per_cpu_context *hv_cpu;
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hv_cpu = per_cpu_ptr(hv_context.cpu_context, channel->target_cpu);
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tasklet_disable(&hv_cpu->event_dpc);
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}
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void hv_event_tasklet_enable(struct vmbus_channel *channel)
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{
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struct tasklet_struct *tasklet;
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tasklet = hv_context.event_dpc[channel->target_cpu];
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tasklet_enable(tasklet);
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struct hv_per_cpu_context *hv_cpu;
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hv_cpu = per_cpu_ptr(hv_context.cpu_context, channel->target_cpu);
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tasklet_enable(&hv_cpu->event_dpc);
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/* In case there is any pending event */
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tasklet_schedule(tasklet);
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tasklet_schedule(&hv_cpu->event_dpc);
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}
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void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
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@ -726,9 +729,12 @@ static void vmbus_wait_for_unload(void)
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break;
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for_each_online_cpu(cpu) {
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page_addr = hv_context.synic_message_page[cpu];
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msg = (struct hv_message *)page_addr +
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VMBUS_MESSAGE_SINT;
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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page_addr = hv_cpu->synic_message_page;
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msg = (struct hv_message *)page_addr
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+ VMBUS_MESSAGE_SINT;
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message_type = READ_ONCE(msg->header.message_type);
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if (message_type == HVMSG_NONE)
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@ -752,7 +758,10 @@ static void vmbus_wait_for_unload(void)
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* messages after we reconnect.
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*/
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for_each_online_cpu(cpu) {
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page_addr = hv_context.synic_message_page[cpu];
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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page_addr = hv_cpu->synic_message_page;
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msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
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msg->header.message_type = HVMSG_NONE;
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}
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@ -93,12 +93,10 @@ static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
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* all the CPUs. This is needed for kexec to work correctly where
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* the CPU attempting to connect may not be CPU 0.
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*/
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if (version >= VERSION_WIN8_1) {
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msg->target_vcpu = hv_context.vp_index[get_cpu()];
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put_cpu();
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} else {
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if (version >= VERSION_WIN8_1)
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msg->target_vcpu = hv_context.vp_index[smp_processor_id()];
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else
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msg->target_vcpu = 0;
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}
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/*
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* Add to list before we send the request since we may
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@ -269,12 +267,12 @@ void vmbus_disconnect(void)
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*/
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static struct vmbus_channel *pcpu_relid2channel(u32 relid)
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{
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struct hv_per_cpu_context *hv_cpu
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= this_cpu_ptr(hv_context.cpu_context);
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struct vmbus_channel *found_channel = NULL;
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struct vmbus_channel *channel;
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struct vmbus_channel *found_channel = NULL;
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int cpu = smp_processor_id();
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struct list_head *pcpu_head = &hv_context.percpu_list[cpu];
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list_for_each_entry(channel, pcpu_head, percpu_list) {
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list_for_each_entry(channel, &hv_cpu->chan_list, percpu_list) {
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if (channel->offermsg.child_relid == relid) {
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found_channel = channel;
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break;
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@ -379,6 +377,7 @@ static void process_chn_event(u32 relid)
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*/
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void vmbus_on_event(unsigned long data)
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{
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struct hv_per_cpu_context *hv_cpu = (void *)data;
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unsigned long *recv_int_page;
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u32 maxbits, relid;
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@ -391,8 +390,7 @@ void vmbus_on_event(unsigned long data)
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* can be directly checked to get the id of the channel
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* that has the interrupt pending.
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*/
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int cpu = smp_processor_id();
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void *page_addr = hv_context.synic_event_page[cpu];
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void *page_addr = hv_cpu->synic_event_page;
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union hv_synic_event_flags *event
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= (union hv_synic_event_flags *)page_addr +
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VMBUS_MESSAGE_SINT;
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126
drivers/hv/hv.c
126
drivers/hv/hv.c
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@ -49,24 +49,13 @@ struct hv_context hv_context = {
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*/
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int hv_init(void)
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{
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memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
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memset(hv_context.synic_message_page, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.post_msg_page, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.vp_index, 0,
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sizeof(int) * NR_CPUS);
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memset(hv_context.event_dpc, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.msg_dpc, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.clk_evt, 0,
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sizeof(void *) * NR_CPUS);
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if (!hv_is_hypercall_page_setup())
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return -ENOTSUPP;
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hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
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if (!hv_context.cpu_context)
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return -ENOMEM;
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return 0;
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}
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@ -79,25 +68,24 @@ int hv_post_message(union hv_connection_id connection_id,
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enum hv_message_type message_type,
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void *payload, size_t payload_size)
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{
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struct hv_input_post_message *aligned_msg;
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struct hv_per_cpu_context *hv_cpu;
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u64 status;
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if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
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return -EMSGSIZE;
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aligned_msg = (struct hv_input_post_message *)
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hv_context.post_msg_page[get_cpu()];
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hv_cpu = get_cpu_ptr(hv_context.cpu_context);
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aligned_msg = hv_cpu->post_msg_page;
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aligned_msg->connectionid = connection_id;
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aligned_msg->reserved = 0;
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aligned_msg->message_type = message_type;
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aligned_msg->payload_size = payload_size;
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memcpy((void *)aligned_msg->payload, payload, payload_size);
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put_cpu_ptr(hv_cpu);
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status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
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put_cpu();
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return status & 0xFFFF;
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}
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@ -154,8 +142,6 @@ static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
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int hv_synic_alloc(void)
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{
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size_t size = sizeof(struct tasklet_struct);
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size_t ced_size = sizeof(struct clock_event_device);
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int cpu;
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hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
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@ -166,53 +152,43 @@ int hv_synic_alloc(void)
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}
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for_each_present_cpu(cpu) {
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hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
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if (hv_context.event_dpc[cpu] == NULL) {
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pr_err("Unable to allocate event dpc\n");
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goto err;
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}
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tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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hv_context.msg_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
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if (hv_context.msg_dpc[cpu] == NULL) {
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pr_err("Unable to allocate event dpc\n");
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goto err;
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}
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tasklet_init(hv_context.msg_dpc[cpu], vmbus_on_msg_dpc, cpu);
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memset(hv_cpu, 0, sizeof(*hv_cpu));
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tasklet_init(&hv_cpu->event_dpc,
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vmbus_on_event, (unsigned long) hv_cpu);
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tasklet_init(&hv_cpu->msg_dpc,
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vmbus_on_msg_dpc, (unsigned long) hv_cpu);
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hv_context.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC);
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if (hv_context.clk_evt[cpu] == NULL) {
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hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
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GFP_KERNEL);
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if (hv_cpu->clk_evt == NULL) {
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pr_err("Unable to allocate clock event device\n");
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goto err;
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}
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hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
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hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu);
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hv_context.synic_message_page[cpu] =
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hv_cpu->synic_message_page =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.synic_message_page[cpu] == NULL) {
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if (hv_cpu->synic_message_page == NULL) {
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pr_err("Unable to allocate SYNIC message page\n");
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goto err;
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}
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hv_context.synic_event_page[cpu] =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.synic_event_page[cpu] == NULL) {
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hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_cpu->synic_event_page == NULL) {
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pr_err("Unable to allocate SYNIC event page\n");
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goto err;
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}
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hv_context.post_msg_page[cpu] =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.post_msg_page[cpu] == NULL) {
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hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_cpu->post_msg_page == NULL) {
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pr_err("Unable to allocate post msg page\n");
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goto err;
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}
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INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
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INIT_LIST_HEAD(&hv_cpu->chan_list);
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}
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return 0;
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@ -220,26 +196,24 @@ err:
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return -ENOMEM;
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}
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static void hv_synic_free_cpu(int cpu)
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{
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kfree(hv_context.event_dpc[cpu]);
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kfree(hv_context.msg_dpc[cpu]);
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kfree(hv_context.clk_evt[cpu]);
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if (hv_context.synic_event_page[cpu])
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free_page((unsigned long)hv_context.synic_event_page[cpu]);
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if (hv_context.synic_message_page[cpu])
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free_page((unsigned long)hv_context.synic_message_page[cpu]);
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if (hv_context.post_msg_page[cpu])
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free_page((unsigned long)hv_context.post_msg_page[cpu]);
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}
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void hv_synic_free(void)
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{
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int cpu;
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for_each_present_cpu(cpu) {
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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if (hv_cpu->synic_event_page)
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free_page((unsigned long)hv_cpu->synic_event_page);
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if (hv_cpu->synic_message_page)
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free_page((unsigned long)hv_cpu->synic_message_page);
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if (hv_cpu->post_msg_page)
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free_page((unsigned long)hv_cpu->post_msg_page);
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}
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kfree(hv_context.hv_numa_map);
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for_each_present_cpu(cpu)
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hv_synic_free_cpu(cpu);
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}
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/*
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@ -251,6 +225,8 @@ void hv_synic_free(void)
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*/
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int hv_synic_init(unsigned int cpu)
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{
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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union hv_synic_simp simp;
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union hv_synic_siefp siefp;
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union hv_synic_sint shared_sint;
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@ -260,7 +236,7 @@ int hv_synic_init(unsigned int cpu)
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/* Setup the Synic's message page */
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hv_get_simp(simp.as_uint64);
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simp.simp_enabled = 1;
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simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
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simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
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>> PAGE_SHIFT;
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hv_set_simp(simp.as_uint64);
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@ -268,7 +244,7 @@ int hv_synic_init(unsigned int cpu)
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/* Setup the Synic's event page */
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hv_get_siefp(siefp.as_uint64);
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siefp.siefp_enabled = 1;
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siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
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siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
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>> PAGE_SHIFT;
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hv_set_siefp(siefp.as_uint64);
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@ -305,7 +281,7 @@ int hv_synic_init(unsigned int cpu)
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* Register the per-cpu clockevent source.
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*/
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if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
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clockevents_config_and_register(hv_context.clk_evt[cpu],
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clockevents_config_and_register(hv_cpu->clk_evt,
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HV_TIMER_FREQUENCY,
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HV_MIN_DELTA_TICKS,
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HV_MAX_MAX_DELTA_TICKS);
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@ -322,8 +298,12 @@ void hv_synic_clockevents_cleanup(void)
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if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
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return;
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for_each_present_cpu(cpu)
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clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
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for_each_present_cpu(cpu) {
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struct hv_per_cpu_context *hv_cpu
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= per_cpu_ptr(hv_context.cpu_context, cpu);
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clockevents_unbind_device(hv_cpu->clk_evt, cpu);
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}
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}
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/*
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@ -372,8 +352,12 @@ int hv_synic_cleanup(unsigned int cpu)
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/* Turn off clockevent device */
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if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
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clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
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hv_ce_shutdown(hv_context.clk_evt[cpu]);
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struct hv_per_cpu_context *hv_cpu
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= this_cpu_ptr(hv_context.cpu_context);
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clockevents_unbind_device(hv_cpu->clk_evt, cpu);
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hv_ce_shutdown(hv_cpu->clk_evt);
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put_cpu_ptr(hv_cpu);
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}
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hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
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@ -29,6 +29,7 @@
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#include <asm/sync_bitops.h>
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#include <linux/atomic.h>
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#include <linux/hyperv.h>
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#include <linux/interrupt.h>
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/*
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* Timeout for services such as KVP and fcopy.
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@ -189,6 +190,33 @@ enum {
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VMBUS_MESSAGE_SINT = 2,
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};
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/*
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* Per cpu state for channel handling
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*/
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struct hv_per_cpu_context {
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void *synic_message_page;
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void *synic_event_page;
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/*
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* buffer to post messages to the host.
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*/
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void *post_msg_page;
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|
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/*
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* Starting with win8, we can take channel interrupts on any CPU;
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* we will manage the tasklet that handles events messages on a per CPU
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* basis.
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*/
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struct tasklet_struct event_dpc;
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struct tasklet_struct msg_dpc;
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|
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/*
|
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* To optimize the mapping of relid to channel, maintain
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* per-cpu list of the channels based on their CPU affinity.
|
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*/
|
||||
struct list_head chan_list;
|
||||
struct clock_event_device *clk_evt;
|
||||
};
|
||||
|
||||
struct hv_context {
|
||||
/* We only support running on top of Hyper-V
|
||||
* So at this point this really can only contain the Hyper-V ID
|
||||
|
|
@ -199,8 +227,8 @@ struct hv_context {
|
|||
|
||||
bool synic_initialized;
|
||||
|
||||
void *synic_message_page[NR_CPUS];
|
||||
void *synic_event_page[NR_CPUS];
|
||||
struct hv_per_cpu_context __percpu *cpu_context;
|
||||
|
||||
/*
|
||||
* Hypervisor's notion of virtual processor ID is different from
|
||||
* Linux' notion of CPU ID. This information can only be retrieved
|
||||
|
|
@ -211,26 +239,7 @@ struct hv_context {
|
|||
* Linux cpuid 'a'.
|
||||
*/
|
||||
u32 vp_index[NR_CPUS];
|
||||
/*
|
||||
* Starting with win8, we can take channel interrupts on any CPU;
|
||||
* we will manage the tasklet that handles events messages on a per CPU
|
||||
* basis.
|
||||
*/
|
||||
struct tasklet_struct *event_dpc[NR_CPUS];
|
||||
struct tasklet_struct *msg_dpc[NR_CPUS];
|
||||
/*
|
||||
* To optimize the mapping of relid to channel, maintain
|
||||
* per-cpu list of the channels based on their CPU affinity.
|
||||
*/
|
||||
struct list_head percpu_list[NR_CPUS];
|
||||
/*
|
||||
* buffer to post messages to the host.
|
||||
*/
|
||||
void *post_msg_page[NR_CPUS];
|
||||
/*
|
||||
* Support PV clockevent device.
|
||||
*/
|
||||
struct clock_event_device *clk_evt[NR_CPUS];
|
||||
|
||||
/*
|
||||
* To manage allocations in a NUMA node.
|
||||
* Array indexed by numa node ID.
|
||||
|
|
|
|||
|
|
@ -835,9 +835,10 @@ static void vmbus_onmessage_work(struct work_struct *work)
|
|||
kfree(ctx);
|
||||
}
|
||||
|
||||
static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
|
||||
static void hv_process_timer_expiration(struct hv_message *msg,
|
||||
struct hv_per_cpu_context *hv_cpu)
|
||||
{
|
||||
struct clock_event_device *dev = hv_context.clk_evt[cpu];
|
||||
struct clock_event_device *dev = hv_cpu->clk_evt;
|
||||
|
||||
if (dev->event_handler)
|
||||
dev->event_handler(dev);
|
||||
|
|
@ -847,8 +848,8 @@ 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_per_cpu_context *hv_cpu = (void *)data;
|
||||
void *page_addr = hv_cpu->synic_message_page;
|
||||
struct hv_message *msg = (struct hv_message *)page_addr +
|
||||
VMBUS_MESSAGE_SINT;
|
||||
struct vmbus_channel_message_header *hdr;
|
||||
|
|
@ -886,14 +887,14 @@ msg_handled:
|
|||
|
||||
static void vmbus_isr(void)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
void *page_addr;
|
||||
struct hv_per_cpu_context *hv_cpu
|
||||
= this_cpu_ptr(hv_context.cpu_context);
|
||||
void *page_addr = hv_cpu->synic_event_page;
|
||||
struct hv_message *msg;
|
||||
union hv_synic_event_flags *event;
|
||||
bool handled = false;
|
||||
|
||||
page_addr = hv_context.synic_event_page[cpu];
|
||||
if (page_addr == NULL)
|
||||
if (unlikely(page_addr == NULL))
|
||||
return;
|
||||
|
||||
event = (union hv_synic_event_flags *)page_addr +
|
||||
|
|
@ -921,18 +922,18 @@ static void vmbus_isr(void)
|
|||
}
|
||||
|
||||
if (handled)
|
||||
tasklet_schedule(hv_context.event_dpc[cpu]);
|
||||
tasklet_schedule(&hv_cpu->event_dpc);
|
||||
|
||||
|
||||
page_addr = hv_context.synic_message_page[cpu];
|
||||
page_addr = hv_cpu->synic_message_page;
|
||||
msg = (struct hv_message *)page_addr + 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);
|
||||
hv_process_timer_expiration(msg, hv_cpu);
|
||||
else
|
||||
tasklet_schedule(hv_context.msg_dpc[cpu]);
|
||||
tasklet_schedule(&hv_cpu->msg_dpc);
|
||||
}
|
||||
|
||||
add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
|
||||
|
|
@ -1521,9 +1522,14 @@ static void __exit vmbus_exit(void)
|
|||
hv_synic_clockevents_cleanup();
|
||||
vmbus_disconnect();
|
||||
hv_remove_vmbus_irq();
|
||||
for_each_online_cpu(cpu)
|
||||
tasklet_kill(hv_context.msg_dpc[cpu]);
|
||||
for_each_online_cpu(cpu) {
|
||||
struct hv_per_cpu_context *hv_cpu
|
||||
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
||||
|
||||
tasklet_kill(&hv_cpu->msg_dpc);
|
||||
}
|
||||
vmbus_free_channels();
|
||||
|
||||
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
|
||||
unregister_die_notifier(&hyperv_die_block);
|
||||
atomic_notifier_chain_unregister(&panic_notifier_list,
|
||||
|
|
@ -1531,7 +1537,10 @@ static void __exit vmbus_exit(void)
|
|||
}
|
||||
bus_unregister(&hv_bus);
|
||||
for_each_online_cpu(cpu) {
|
||||
tasklet_kill(hv_context.event_dpc[cpu]);
|
||||
struct hv_per_cpu_context *hv_cpu
|
||||
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
||||
|
||||
tasklet_kill(&hv_cpu->event_dpc);
|
||||
}
|
||||
cpuhp_remove_state(hyperv_cpuhp_online);
|
||||
hv_synic_free();
|
||||
|
|
|
|||
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