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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* SGI UV Broadcast Assist Unit definitions
*
* Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
*/
#ifndef _ASM_X86_UV_UV_BAU_H
#define _ASM_X86_UV_UV_BAU_H
#include <linux/bitmap.h>
#define BITSPERBYTE 8
/*
* Broadcast Assist Unit messaging structures
*
* Selective Broadcast activations are induced by software action
* specifying a particular 8-descriptor "set" via a 6-bit index written
* to an MMR.
* Thus there are 64 unique 512-byte sets of SB descriptors - one set for
* each 6-bit index value. These descriptor sets are mapped in sequence
* starting with set 0 located at the address specified in the
* BAU_SB_DESCRIPTOR_BASE register, set 1 is located at BASE + 512,
* set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
*
* We will use one set for sending BAU messages from each of the
* cpu's on the uvhub.
*
* TLB shootdown will use the first of the 8 descriptors of each set.
* Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
*/
#define MAX_CPUS_PER_UVHUB 64
#define MAX_CPUS_PER_SOCKET 32
#define UV_ADP_SIZE 64 /* hardware-provided max. */
#define UV_CPUS_PER_ACT_STATUS 32 /* hardware-provided max. */
#define UV_ITEMS_PER_DESCRIPTOR 8
/* the 'throttle' to prevent the hardware stay-busy bug */
#define MAX_BAU_CONCURRENT 3
#define UV_ACT_STATUS_MASK 0x3
#define UV_ACT_STATUS_SIZE 2
#define UV_DISTRIBUTION_SIZE 256
#define UV_SW_ACK_NPENDING 8
#define UV_NET_ENDPOINT_INTD 0x38
#define UV_DESC_BASE_PNODE_SHIFT 49
#define UV_PAYLOADQ_PNODE_SHIFT 49
#define UV_PTC_BASENAME "sgi_uv/ptc_statistics"
#define UV_BAU_BASENAME "sgi_uv/bau_tunables"
#define UV_BAU_TUNABLES_DIR "sgi_uv"
#define UV_BAU_TUNABLES_FILE "bau_tunables"
#define WHITESPACE " \t\n"
#define uv_physnodeaddr(x) ((__pa((unsigned long)(x)) & uv_mmask))
#define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15
#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16
#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x0000000009UL
/* [19:16] SOFT_ACK timeout period 19: 1 is urgency 7 17:16 1 is multiplier */
#define BAU_MISC_CONTROL_MULT_MASK 3
#define UVH_AGING_PRESCALE_SEL 0x000000b000UL
/* [30:28] URGENCY_7 an index into a table of times */
#define BAU_URGENCY_7_SHIFT 28
#define BAU_URGENCY_7_MASK 7
#define UVH_TRANSACTION_TIMEOUT 0x000000b200UL
/* [45:40] BAU - BAU transaction timeout select - a multiplier */
#define BAU_TRANS_SHIFT 40
#define BAU_TRANS_MASK 0x3f
/*
* bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1
*/
#define DESC_STATUS_IDLE 0
#define DESC_STATUS_ACTIVE 1
#define DESC_STATUS_DESTINATION_TIMEOUT 2
#define DESC_STATUS_SOURCE_TIMEOUT 3
/*
* delay for 'plugged' timeout retries, in microseconds
*/
#define PLUGGED_DELAY 10
/*
* threshholds at which to use IPI to free resources
*/
/* after this # consecutive 'plugged' timeouts, use IPI to release resources */
#define PLUGSB4RESET 100
/* after this many consecutive timeouts, use IPI to release resources */
#define TIMEOUTSB4RESET 1
/* at this number uses of IPI to release resources, giveup the request */
#define IPI_RESET_LIMIT 1
/* after this # consecutive successes, bump up the throttle if it was lowered */
#define COMPLETE_THRESHOLD 5
/*
* number of entries in the destination side payload queue
*/
#define DEST_Q_SIZE 20
/*
* number of destination side software ack resources
*/
#define DEST_NUM_RESOURCES 8
/*
* completion statuses for sending a TLB flush message
*/
#define FLUSH_RETRY_PLUGGED 1
#define FLUSH_RETRY_TIMEOUT 2
#define FLUSH_GIVEUP 3
#define FLUSH_COMPLETE 4
/*
* tuning the action when the numalink network is extremely delayed
*/
#define CONGESTED_RESPONSE_US 1000 /* 'long' response time, in microseconds */
#define CONGESTED_REPS 10 /* long delays averaged over this many broadcasts */
#define CONGESTED_PERIOD 30 /* time for the bau to be disabled, in seconds */
/*
* Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
* If the 'multilevel' flag in the header portion of the descriptor
* has been set to 0, then endpoint multi-unicast mode is selected.
* The distribution specification (32 bytes) is interpreted as a 256-bit
* distribution vector. Adjacent bits correspond to consecutive even numbered
* nodeIDs. The result of adding the index of a given bit to the 15-bit
* 'base_dest_nodeid' field of the header corresponds to the
* destination nodeID associated with that specified bit.
*/
struct bau_target_uvhubmask {
unsigned long bits[BITS_TO_LONGS(UV_DISTRIBUTION_SIZE)];
};
/*
* mask of cpu's on a uvhub
* (during initialization we need to check that unsigned long has
* enough bits for max. cpu's per uvhub)
*/
struct bau_local_cpumask {
unsigned long bits;
};
/*
* Payload: 16 bytes (128 bits) (bytes 0x20-0x2f of descriptor)
* only 12 bytes (96 bits) of the payload area are usable.
* An additional 3 bytes (bits 27:4) of the header address are carried
* to the next bytes of the destination payload queue.
* And an additional 2 bytes of the header Suppl_A field are also
* carried to the destination payload queue.
* But the first byte of the Suppl_A becomes bits 127:120 (the 16th byte)
* of the destination payload queue, which is written by the hardware
* with the s/w ack resource bit vector.
* [ effective message contents (16 bytes (128 bits) maximum), not counting
* the s/w ack bit vector ]
*/
/*
* The payload is software-defined for INTD transactions
*/
struct bau_msg_payload {
unsigned long address; /* signifies a page or all TLB's
of the cpu */
/* 64 bits */
unsigned short sending_cpu; /* filled in by sender */
/* 16 bits */
unsigned short acknowledge_count;/* filled in by destination */
/* 16 bits */
unsigned int reserved1:32; /* not usable */
};
/*
* Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
* see table 4.2.3.0.1 in broacast_assist spec.
*/
struct bau_msg_header {
unsigned int dest_subnodeid:6; /* must be 0x10, for the LB */
/* bits 5:0 */
unsigned int base_dest_nodeid:15; /* nasid of the */
/* bits 20:6 */ /* first bit in uvhub map */
unsigned int command:8; /* message type */
/* bits 28:21 */
/* 0x38: SN3net EndPoint Message */
unsigned int rsvd_1:3; /* must be zero */
/* bits 31:29 */
/* int will align on 32 bits */
unsigned int rsvd_2:9; /* must be zero */
/* bits 40:32 */
/* Suppl_A is 56-41 */
unsigned int sequence:16;/* message sequence number */
/* bits 56:41 */ /* becomes bytes 16-17 of msg */
/* Address field (96:57) is never used as an
address (these are address bits 42:3) */
unsigned int rsvd_3:1; /* must be zero */
/* bit 57 */
/* address bits 27:4 are payload */
/* these next 24 (58-81) bits become bytes 12-14 of msg */
/* bits 65:58 land in byte 12 */
unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */
/* bit 58 */
unsigned int msg_type:3; /* software type of the message*/
/* bits 61:59 */
unsigned int canceled:1; /* message canceled, resource to be freed*/
/* bit 62 */
unsigned int payload_1a:1;/* not currently used */
/* bit 63 */
unsigned int payload_1b:2;/* not currently used */
/* bits 65:64 */
/* bits 73:66 land in byte 13 */
unsigned int payload_1ca:6;/* not currently used */
/* bits 71:66 */
unsigned int payload_1c:2;/* not currently used */
/* bits 73:72 */
/* bits 81:74 land in byte 14 */
unsigned int payload_1d:6;/* not currently used */
/* bits 79:74 */
unsigned int payload_1e:2;/* not currently used */
/* bits 81:80 */
unsigned int rsvd_4:7; /* must be zero */
/* bits 88:82 */
unsigned int sw_ack_flag:1;/* software acknowledge flag */
/* bit 89 */
/* INTD trasactions at destination are to
wait for software acknowledge */
unsigned int rsvd_5:6; /* must be zero */
/* bits 95:90 */
unsigned int rsvd_6:5; /* must be zero */
/* bits 100:96 */
unsigned int int_both:1;/* if 1, interrupt both sockets on the uvhub */
/* bit 101*/
unsigned int fairness:3;/* usually zero */
/* bits 104:102 */
unsigned int multilevel:1; /* multi-level multicast format */
/* bit 105 */
/* 0 for TLB: endpoint multi-unicast messages */
unsigned int chaining:1;/* next descriptor is part of this activation*/
/* bit 106 */
unsigned int rsvd_7:21; /* must be zero */
/* bits 127:107 */
};
/* see msg_type: */
#define MSG_NOOP 0
#define MSG_REGULAR 1
#define MSG_RETRY 2
/*
* The activation descriptor:
* The format of the message to send, plus all accompanying control
* Should be 64 bytes
*/
struct bau_desc {
struct bau_target_uvhubmask distribution;
/*
* message template, consisting of header and payload:
*/
struct bau_msg_header header;
struct bau_msg_payload payload;
};
/*
* -payload-- ---------header------
* bytes 0-11 bits 41-56 bits 58-81
* A B (2) C (3)
*
* A/B/C are moved to:
* A C B
* bytes 0-11 bytes 12-14 bytes 16-17 (byte 15 filled in by hw as vector)
* ------------payload queue-----------
*/
/*
* The payload queue on the destination side is an array of these.
* With BAU_MISC_CONTROL set for software acknowledge mode, the messages
* are 32 bytes (2 micropackets) (256 bits) in length, but contain only 17
* bytes of usable data, including the sw ack vector in byte 15 (bits 127:120)
* (12 bytes come from bau_msg_payload, 3 from payload_1, 2 from
* sw_ack_vector and payload_2)
* "Enabling Software Acknowledgment mode (see Section 4.3.3 Software
* Acknowledge Processing) also selects 32 byte (17 bytes usable) payload
* operation."
*/
struct bau_payload_queue_entry {
unsigned long address; /* signifies a page or all TLB's
of the cpu */
/* 64 bits, bytes 0-7 */
unsigned short sending_cpu; /* cpu that sent the message */
/* 16 bits, bytes 8-9 */
unsigned short acknowledge_count; /* filled in by destination */
/* 16 bits, bytes 10-11 */
/* these next 3 bytes come from bits 58-81 of the message header */
unsigned short replied_to:1; /* sent as 0 by the source */
unsigned short msg_type:3; /* software message type */
unsigned short canceled:1; /* sent as 0 by the source */
unsigned short unused1:3; /* not currently using */
/* byte 12 */
unsigned char unused2a; /* not currently using */
/* byte 13 */
unsigned char unused2; /* not currently using */
/* byte 14 */
unsigned char sw_ack_vector; /* filled in by the hardware */
/* byte 15 (bits 127:120) */
unsigned short sequence; /* message sequence number */
/* bytes 16-17 */
unsigned char unused4[2]; /* not currently using bytes 18-19 */
/* bytes 18-19 */
int number_of_cpus; /* filled in at destination */
/* 32 bits, bytes 20-23 (aligned) */
unsigned char unused5[8]; /* not using */
/* bytes 24-31 */
};
struct msg_desc {
struct bau_payload_queue_entry *msg;
int msg_slot;
int sw_ack_slot;
struct bau_payload_queue_entry *va_queue_first;
struct bau_payload_queue_entry *va_queue_last;
};
struct reset_args {
int sender;
};
/*
* This structure is allocated per_cpu for UV TLB shootdown statistics.
*/
struct ptc_stats {
/* sender statistics */
unsigned long s_giveup; /* number of fall backs to IPI-style flushes */
unsigned long s_requestor; /* number of shootdown requests */
unsigned long s_stimeout; /* source side timeouts */
unsigned long s_dtimeout; /* destination side timeouts */
unsigned long s_time; /* time spent in sending side */
unsigned long s_retriesok; /* successful retries */
unsigned long s_ntargcpu; /* total number of cpu's targeted */
unsigned long s_ntargself; /* times the sending cpu was targeted */
unsigned long s_ntarglocals; /* targets of cpus on the local blade */
unsigned long s_ntargremotes; /* targets of cpus on remote blades */
unsigned long s_ntarglocaluvhub; /* targets of the local hub */
unsigned long s_ntargremoteuvhub; /* remotes hubs targeted */
unsigned long s_ntarguvhub; /* total number of uvhubs targeted */
unsigned long s_ntarguvhub16; /* number of times target hubs >= 16*/
unsigned long s_ntarguvhub8; /* number of times target hubs >= 8 */
unsigned long s_ntarguvhub4; /* number of times target hubs >= 4 */
unsigned long s_ntarguvhub2; /* number of times target hubs >= 2 */
unsigned long s_ntarguvhub1; /* number of times target hubs == 1 */
unsigned long s_resets_plug; /* ipi-style resets from plug state */
unsigned long s_resets_timeout; /* ipi-style resets from timeouts */
unsigned long s_busy; /* status stayed busy past s/w timer */
unsigned long s_throttles; /* waits in throttle */
unsigned long s_retry_messages; /* retry broadcasts */
unsigned long s_bau_reenabled; /* for bau enable/disable */
unsigned long s_bau_disabled; /* for bau enable/disable */
/* destination statistics */
unsigned long d_alltlb; /* times all tlb's on this cpu were flushed */
unsigned long d_onetlb; /* times just one tlb on this cpu was flushed */
unsigned long d_multmsg; /* interrupts with multiple messages */
unsigned long d_nomsg; /* interrupts with no message */
unsigned long d_time; /* time spent on destination side */
unsigned long d_requestee; /* number of messages processed */
unsigned long d_retries; /* number of retry messages processed */
unsigned long d_canceled; /* number of messages canceled by retries */
unsigned long d_nocanceled; /* retries that found nothing to cancel */
unsigned long d_resets; /* number of ipi-style requests processed */
unsigned long d_rcanceled; /* number of messages canceled by resets */
};
/*
* one per-cpu; to locate the software tables
*/
struct bau_control {
struct bau_desc *descriptor_base;
struct bau_payload_queue_entry *va_queue_first;
struct bau_payload_queue_entry *va_queue_last;
struct bau_payload_queue_entry *bau_msg_head;
struct bau_control *uvhub_master;
struct bau_control *socket_master;
struct ptc_stats *statp;
unsigned long timeout_interval;
unsigned long set_bau_on_time;
atomic_t active_descriptor_count;
int plugged_tries;
int timeout_tries;
int ipi_attempts;
int conseccompletes;
int baudisabled;
int set_bau_off;
short cpu;
short uvhub_cpu;
short uvhub;
short cpus_in_socket;
short cpus_in_uvhub;
unsigned short message_number;
unsigned short uvhub_quiesce;
short socket_acknowledge_count[DEST_Q_SIZE];
cycles_t send_message;
spinlock_t uvhub_lock;
spinlock_t queue_lock;
/* tunables */
int max_bau_concurrent;
int max_bau_concurrent_constant;
int plugged_delay;
int plugsb4reset;
int timeoutsb4reset;
int ipi_reset_limit;
int complete_threshold;
int congested_response_us;
int congested_reps;
int congested_period;
cycles_t period_time;
long period_requests;
};
static inline int bau_uvhub_isset(int uvhub, struct bau_target_uvhubmask *dstp)
{
return constant_test_bit(uvhub, &dstp->bits[0]);
}
static inline void bau_uvhub_set(int uvhub, struct bau_target_uvhubmask *dstp)
{
__set_bit(uvhub, &dstp->bits[0]);
}
static inline void bau_uvhubs_clear(struct bau_target_uvhubmask *dstp,
int nbits)
{
bitmap_zero(&dstp->bits[0], nbits);
}
static inline int bau_uvhub_weight(struct bau_target_uvhubmask *dstp)
{
return bitmap_weight((unsigned long *)&dstp->bits[0],
UV_DISTRIBUTION_SIZE);
}
static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
{
bitmap_zero(&dstp->bits, nbits);
}
#define cpubit_isset(cpu, bau_local_cpumask) \
test_bit((cpu), (bau_local_cpumask).bits)
extern void uv_bau_message_intr1(void);
extern void uv_bau_timeout_intr1(void);
struct atomic_short {
short counter;
};
/**
* atomic_read_short - read a short atomic variable
* @v: pointer of type atomic_short
*
* Atomically reads the value of @v.
*/
static inline int atomic_read_short(const struct atomic_short *v)
{
return v->counter;
}
/**
* atomic_add_short_return - add and return a short int
* @i: short value to add
* @v: pointer of type atomic_short
*
* Atomically adds @i to @v and returns @i + @v
*/
static inline int atomic_add_short_return(short i, struct atomic_short *v)
{
short __i = i;
asm volatile(LOCK_PREFIX "xaddw %0, %1"
: "+r" (i), "+m" (v->counter)
: : "memory");
return i + __i;
}
#endif /* _ASM_X86_UV_UV_BAU_H */