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x86, UV: Improve BAU performance and error recovery
- increase performance of the interrupt handler - release timed-out software acknowledge resources - recover from continuous-busy status due to a hardware issue - add a 'throttle' to keep a uvhub from sending more than a specified number of broadcasts concurrently (work around the hardware issue) - provide a 'nobau' boot command line option - rename 'pnode' and 'node' to 'uvhub' (the 'node' terminology is ambiguous) - add some new statistics about the scope of broadcasts, retries, the hardware issue and the 'throttle' - split off new function uv_bau_retry_msg() from uv_bau_process_message() per community coding style feedback. - simplify the argument list to uv_bau_process_message(), per community coding style feedback. Signed-off-by: Cliff Wickman <cpw@sgi.com> Cc: linux-mm@kvack.org Cc: Jack Steiner <steiner@sgi.com> Cc: Russ Anderson <rja@sgi.com> Cc: Mike Travis <travis@sgi.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <E1O25Z4-0004Ur-PB@eag09.americas.sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Cliff Wickman
Ingo Molnar
parent
2acebe9ecb
commit
b8f7fb13d2
@ -27,13 +27,14 @@
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* set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
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*
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* We will use 31 sets, one for sending BAU messages from each of the 32
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* cpu's on the node.
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* cpu's on the uvhub.
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*
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* TLB shootdown will use the first of the 8 descriptors of each set.
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* Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
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*/
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#define UV_ITEMS_PER_DESCRIPTOR 8
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#define MAX_BAU_CONCURRENT 3
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#define UV_CPUS_PER_ACT_STATUS 32
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#define UV_ACT_STATUS_MASK 0x3
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#define UV_ACT_STATUS_SIZE 2
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@ -45,6 +46,9 @@
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#define UV_PAYLOADQ_PNODE_SHIFT 49
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#define UV_PTC_BASENAME "sgi_uv/ptc_statistics"
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#define uv_physnodeaddr(x) ((__pa((unsigned long)(x)) & uv_mmask))
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#define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15
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#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16
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#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x000000000bUL
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/*
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* bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1
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@ -55,15 +59,29 @@
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#define DESC_STATUS_SOURCE_TIMEOUT 3
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/*
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* source side thresholds at which message retries print a warning
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* source side threshholds at which message retries print a warning
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*/
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#define SOURCE_TIMEOUT_LIMIT 20
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#define DESTINATION_TIMEOUT_LIMIT 20
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/*
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* misc. delays, in microseconds
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*/
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#define THROTTLE_DELAY 10
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#define TIMEOUT_DELAY 10
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#define BIOS_TO 1000
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/* BIOS is assumed to set the destination timeout to 1003520 nanoseconds */
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/*
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* threshholds at which to use IPI to free resources
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*/
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#define PLUGSB4RESET 100
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#define TIMEOUTSB4RESET 100
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/*
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* number of entries in the destination side payload queue
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*/
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#define DEST_Q_SIZE 17
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#define DEST_Q_SIZE 20
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/*
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* number of destination side software ack resources
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*/
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@ -72,9 +90,10 @@
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/*
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* completion statuses for sending a TLB flush message
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*/
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#define FLUSH_RETRY 1
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#define FLUSH_GIVEUP 2
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#define FLUSH_COMPLETE 3
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#define FLUSH_RETRY_PLUGGED 1
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#define FLUSH_RETRY_TIMEOUT 2
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#define FLUSH_GIVEUP 3
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#define FLUSH_COMPLETE 4
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/*
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* Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
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@ -86,14 +105,14 @@
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* 'base_dest_nodeid' field of the header corresponds to the
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* destination nodeID associated with that specified bit.
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*/
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struct bau_target_nodemask {
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unsigned long bits[BITS_TO_LONGS(256)];
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struct bau_target_uvhubmask {
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unsigned long bits[BITS_TO_LONGS(UV_DISTRIBUTION_SIZE)];
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};
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/*
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* mask of cpu's on a node
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* mask of cpu's on a uvhub
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* (during initialization we need to check that unsigned long has
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* enough bits for max. cpu's per node)
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* enough bits for max. cpu's per uvhub)
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*/
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struct bau_local_cpumask {
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unsigned long bits;
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@ -135,8 +154,8 @@ struct bau_msg_payload {
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struct bau_msg_header {
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unsigned int dest_subnodeid:6; /* must be 0x10, for the LB */
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/* bits 5:0 */
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unsigned int base_dest_nodeid:15; /* nasid>>1 (pnode) of */
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/* bits 20:6 */ /* first bit in node_map */
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unsigned int base_dest_nodeid:15; /* nasid (pnode<<1) of */
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/* bits 20:6 */ /* first bit in uvhub map */
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unsigned int command:8; /* message type */
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/* bits 28:21 */
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/* 0x38: SN3net EndPoint Message */
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@ -146,26 +165,38 @@ struct bau_msg_header {
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unsigned int rsvd_2:9; /* must be zero */
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/* bits 40:32 */
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/* Suppl_A is 56-41 */
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unsigned int payload_2a:8;/* becomes byte 16 of msg */
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/* bits 48:41 */ /* not currently using */
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unsigned int payload_2b:8;/* becomes byte 17 of msg */
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/* bits 56:49 */ /* not currently using */
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unsigned int sequence:16;/* message sequence number */
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/* bits 56:41 */ /* becomes bytes 16-17 of msg */
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/* Address field (96:57) is never used as an
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address (these are address bits 42:3) */
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unsigned int rsvd_3:1; /* must be zero */
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/* bit 57 */
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/* address bits 27:4 are payload */
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/* these 24 bits become bytes 12-14 of msg */
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/* these next 24 (58-81) bits become bytes 12-14 of msg */
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/* bits 65:58 land in byte 12 */
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unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */
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/* bit 58 */
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unsigned int msg_type:3; /* software type of the message*/
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/* bits 61:59 */
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unsigned int canceled:1; /* message canceled, resource to be freed*/
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/* bit 62 */
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unsigned int payload_1a:1;/* not currently used */
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/* bit 63 */
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unsigned int payload_1b:2;/* not currently used */
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/* bits 65:64 */
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unsigned int payload_1a:5;/* not currently used */
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/* bits 63:59 */
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unsigned int payload_1b:8;/* not currently used */
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/* bits 71:64 */
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unsigned int payload_1c:8;/* not currently used */
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/* bits 79:72 */
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unsigned int payload_1d:2;/* not currently used */
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/* bits 73:66 land in byte 13 */
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unsigned int payload_1ca:6;/* not currently used */
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/* bits 71:66 */
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unsigned int payload_1c:2;/* not currently used */
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/* bits 73:72 */
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/* bits 81:74 land in byte 14 */
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unsigned int payload_1d:6;/* not currently used */
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/* bits 79:74 */
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unsigned int payload_1e:2;/* not currently used */
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/* bits 81:80 */
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unsigned int rsvd_4:7; /* must be zero */
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@ -178,7 +209,7 @@ struct bau_msg_header {
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/* bits 95:90 */
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unsigned int rsvd_6:5; /* must be zero */
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/* bits 100:96 */
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unsigned int int_both:1;/* if 1, interrupt both sockets on the blade */
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unsigned int int_both:1;/* if 1, interrupt both sockets on the uvhub */
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/* bit 101*/
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unsigned int fairness:3;/* usually zero */
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/* bits 104:102 */
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@ -191,13 +222,18 @@ struct bau_msg_header {
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/* bits 127:107 */
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};
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/* see msg_type: */
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#define MSG_NOOP 0
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#define MSG_REGULAR 1
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#define MSG_RETRY 2
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/*
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* The activation descriptor:
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* The format of the message to send, plus all accompanying control
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* Should be 64 bytes
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*/
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struct bau_desc {
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struct bau_target_nodemask distribution;
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struct bau_target_uvhubmask distribution;
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/*
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* message template, consisting of header and payload:
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*/
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@ -237,19 +273,25 @@ struct bau_payload_queue_entry {
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unsigned short acknowledge_count; /* filled in by destination */
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/* 16 bits, bytes 10-11 */
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/* these next 3 bytes come from bits 58-81 of the message header */
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unsigned short replied_to:1; /* sent as 0 by the source */
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/* 1 bit */
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unsigned short unused1:7; /* not currently using */
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/* 7 bits: byte 12) */
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unsigned short msg_type:3; /* software message type */
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unsigned short canceled:1; /* sent as 0 by the source */
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unsigned short unused1:3; /* not currently using */
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/* byte 12 */
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unsigned char unused2[2]; /* not currently using */
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/* bytes 13-14 */
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unsigned char unused2a; /* not currently using */
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/* byte 13 */
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unsigned char unused2; /* not currently using */
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/* byte 14 */
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unsigned char sw_ack_vector; /* filled in by the hardware */
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/* byte 15 (bits 127:120) */
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unsigned char unused4[3]; /* not currently using bytes 17-19 */
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/* bytes 17-19 */
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unsigned short sequence; /* message sequence number */
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/* bytes 16-17 */
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unsigned char unused4[2]; /* not currently using bytes 18-19 */
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/* bytes 18-19 */
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int number_of_cpus; /* filled in at destination */
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/* 32 bits, bytes 20-23 (aligned) */
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@ -259,63 +301,93 @@ struct bau_payload_queue_entry {
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};
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/*
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* one for every slot in the destination payload queue
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*/
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struct bau_msg_status {
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struct bau_local_cpumask seen_by; /* map of cpu's */
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};
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/*
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* one for every slot in the destination software ack resources
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*/
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struct bau_sw_ack_status {
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struct bau_payload_queue_entry *msg; /* associated message */
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int watcher; /* cpu monitoring, or -1 */
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};
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/*
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* one on every node and per-cpu; to locate the software tables
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* one per-cpu; to locate the software tables
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*/
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struct bau_control {
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struct bau_desc *descriptor_base;
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struct bau_payload_queue_entry *bau_msg_head;
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struct bau_payload_queue_entry *va_queue_first;
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struct bau_payload_queue_entry *va_queue_last;
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struct bau_msg_status *msg_statuses;
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int *watching; /* pointer to array */
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struct bau_payload_queue_entry *bau_msg_head;
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struct bau_control *uvhub_master;
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struct bau_control *socket_master;
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unsigned long timeout_interval;
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atomic_t active_descriptor_count;
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int max_concurrent;
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int max_concurrent_constant;
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int retry_message_scans;
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int plugged_tries;
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int timeout_tries;
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int ipi_attempts;
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int conseccompletes;
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short cpu;
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short uvhub_cpu;
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short uvhub;
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short cpus_in_socket;
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short cpus_in_uvhub;
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unsigned short message_number;
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unsigned short uvhub_quiesce;
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short socket_acknowledge_count[DEST_Q_SIZE];
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cycles_t send_message;
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spinlock_t masks_lock;
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spinlock_t uvhub_lock;
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spinlock_t queue_lock;
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};
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/*
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* This structure is allocated per_cpu for UV TLB shootdown statistics.
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*/
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struct ptc_stats {
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unsigned long ptc_i; /* number of IPI-style flushes */
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unsigned long requestor; /* number of nodes this cpu sent to */
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unsigned long requestee; /* times cpu was remotely requested */
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unsigned long alltlb; /* times all tlb's on this cpu were flushed */
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unsigned long onetlb; /* times just one tlb on this cpu was flushed */
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unsigned long s_retry; /* retries on source side timeouts */
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unsigned long d_retry; /* retries on destination side timeouts */
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unsigned long sflush; /* cycles spent in uv_flush_tlb_others */
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unsigned long dflush; /* cycles spent on destination side */
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unsigned long retriesok; /* successes on retries */
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unsigned long nomsg; /* interrupts with no message */
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unsigned long multmsg; /* interrupts with multiple messages */
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unsigned long ntargeted;/* nodes targeted */
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/* sender statistics */
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unsigned long s_giveup; /* number of fall backs to IPI-style flushes */
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unsigned long s_requestor; /* number of shootdown requests */
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unsigned long s_stimeout; /* source side timeouts */
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unsigned long s_dtimeout; /* destination side timeouts */
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unsigned long s_time; /* time spent in sending side */
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unsigned long s_retriesok; /* successful retries */
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unsigned long s_ntargcpu; /* number of cpus targeted */
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unsigned long s_ntarguvhub; /* number of uvhubs targeted */
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unsigned long s_ntarguvhub16; /* number of times >= 16 target hubs */
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unsigned long s_ntarguvhub8; /* number of times >= 8 target hubs */
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unsigned long s_ntarguvhub4; /* number of times >= 4 target hubs */
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unsigned long s_ntarguvhub2; /* number of times >= 2 target hubs */
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unsigned long s_ntarguvhub1; /* number of times == 1 target hub */
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unsigned long s_resets_plug; /* ipi-style resets from plug state */
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unsigned long s_resets_timeout; /* ipi-style resets from timeouts */
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unsigned long s_busy; /* status stayed busy past s/w timer */
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unsigned long s_throttles; /* waits in throttle */
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unsigned long s_retry_messages; /* retry broadcasts */
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/* destination statistics */
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unsigned long d_alltlb; /* times all tlb's on this cpu were flushed */
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unsigned long d_onetlb; /* times just one tlb on this cpu was flushed */
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unsigned long d_multmsg; /* interrupts with multiple messages */
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unsigned long d_nomsg; /* interrupts with no message */
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unsigned long d_time; /* time spent on destination side */
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unsigned long d_requestee; /* number of messages processed */
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unsigned long d_retries; /* number of retry messages processed */
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unsigned long d_canceled; /* number of messages canceled by retries */
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unsigned long d_nocanceled; /* retries that found nothing to cancel */
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unsigned long d_resets; /* number of ipi-style requests processed */
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unsigned long d_rcanceled; /* number of messages canceled by resets */
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};
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static inline int bau_node_isset(int node, struct bau_target_nodemask *dstp)
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static inline int bau_uvhub_isset(int uvhub, struct bau_target_uvhubmask *dstp)
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{
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return constant_test_bit(node, &dstp->bits[0]);
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return constant_test_bit(uvhub, &dstp->bits[0]);
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}
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static inline void bau_node_set(int node, struct bau_target_nodemask *dstp)
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static inline void bau_uvhub_set(int uvhub, struct bau_target_uvhubmask *dstp)
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{
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__set_bit(node, &dstp->bits[0]);
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__set_bit(uvhub, &dstp->bits[0]);
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}
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static inline void bau_nodes_clear(struct bau_target_nodemask *dstp, int nbits)
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static inline void bau_uvhubs_clear(struct bau_target_uvhubmask *dstp,
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int nbits)
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{
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bitmap_zero(&dstp->bits[0], nbits);
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}
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static inline int bau_uvhub_weight(struct bau_target_uvhubmask *dstp)
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{
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return bitmap_weight((unsigned long *)&dstp->bits[0],
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UV_DISTRIBUTION_SIZE);
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}
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static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
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{
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@ -328,4 +400,35 @@ static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
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extern void uv_bau_message_intr1(void);
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extern void uv_bau_timeout_intr1(void);
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struct atomic_short {
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short counter;
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};
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/**
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* atomic_read_short - read a short atomic variable
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* @v: pointer of type atomic_short
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*
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* Atomically reads the value of @v.
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*/
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static inline int atomic_read_short(const struct atomic_short *v)
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{
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return v->counter;
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}
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/**
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* atomic_add_short_return - add and return a short int
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* @i: short value to add
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* @v: pointer of type atomic_short
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*
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* Atomically adds @i to @v and returns @i + @v
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*/
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static inline int atomic_add_short_return(short i, struct atomic_short *v)
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{
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short __i = i;
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asm volatile(LOCK_PREFIX "xaddw %0, %1"
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: "+r" (i), "+m" (v->counter)
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: : "memory");
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return i + __i;
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}
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#endif /* _ASM_X86_UV_UV_BAU_H */
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