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Drivers: hv: Add code to distribute channel interrupt load
Implement a simple policy for distributing incoming interrupt load. We classify channels as (a) performance critical and (b) not performance critical. All non-performance critical channels will be bound to the boot cpu. Performance critical channels will be bound to the remaining available CPUs on a round-robin basis. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -257,6 +257,89 @@ static void vmbus_process_offer(struct work_struct *work)
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}
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}
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enum {
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IDE = 0,
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SCSI,
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NIC,
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MAX_PERF_CHN,
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};
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/*
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* This is an array of channels (devices) that are performance critical.
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* We attempt to distribute the interrupt load for these devices across
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* all available CPUs.
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*/
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static const uuid_le hp_devs[] = {
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/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
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/* IDE */
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{
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.b = {
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0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
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0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
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}
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},
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/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
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/* Storage - SCSI */
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{
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.b = {
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0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
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0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
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}
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},
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/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
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/* Network */
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{
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.b = {
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0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
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0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
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}
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},
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};
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/*
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* We use this state to statically distribute the channel interrupt load.
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*/
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static u32 next_vp;
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/*
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* Starting with Win8, we can statically distribute the incoming
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* channel interrupt load by binding a channel to VCPU. We
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* implement here a simple round robin scheme for distributing
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* the interrupt load.
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* We will bind channels that are not performance critical to cpu 0 and
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* performance critical channels (IDE, SCSI and Network) will be uniformly
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* distributed across all available CPUs.
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*/
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static u32 get_vp_index(uuid_le *type_guid)
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{
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u32 cur_cpu;
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int i;
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bool perf_chn = false;
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u32 max_cpus = num_online_cpus();
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for (i = IDE; i < MAX_PERF_CHN; i++) {
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if (!memcmp(type_guid->b, hp_devs[i].b,
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sizeof(uuid_le))) {
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perf_chn = true;
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break;
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}
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}
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if ((vmbus_proto_version == VERSION_WS2008) ||
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(vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) {
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/*
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* Prior to win8, all channel interrupts are
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* delivered on cpu 0.
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* Also if the channel is not a performance critical
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* channel, bind it to cpu 0.
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*/
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return 0;
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}
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cur_cpu = (++next_vp % max_cpus);
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return hv_context.vp_index[cur_cpu];
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}
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/*
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* vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
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*
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@ -302,7 +385,7 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
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offer->connection_id;
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}
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newchannel->target_vp = 0;
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newchannel->target_vp = get_vp_index(&offer->offer.if_type);
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memcpy(&newchannel->offermsg, offer,
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sizeof(struct vmbus_channel_offer_channel));
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