1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * SGI UV Broadcast Assist Unit definitions
7 *
8 * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
9 */
10
11 #ifndef _ASM_X86_UV_UV_BAU_H
12 #define _ASM_X86_UV_UV_BAU_H
13
14 #include <linux/bitmap.h>
15 #define BITSPERBYTE 8
16
17 /*
18 * Broadcast Assist Unit messaging structures
19 *
20 * Selective Broadcast activations are induced by software action
21 * specifying a particular 8-descriptor "set" via a 6-bit index written
22 * to an MMR.
23 * Thus there are 64 unique 512-byte sets of SB descriptors - one set for
24 * each 6-bit index value. These descriptor sets are mapped in sequence
25 * starting with set 0 located at the address specified in the
26 * BAU_SB_DESCRIPTOR_BASE register, set 1 is located at BASE + 512,
27 * set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
28 *
29 * We will use 31 sets, one for sending BAU messages from each of the 32
30 * cpu's on the node.
31 *
32 * TLB shootdown will use the first of the 8 descriptors of each set.
33 * Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
34 */
35
36 #define UV_ITEMS_PER_DESCRIPTOR 8
37 #define UV_CPUS_PER_ACT_STATUS 32
38 #define UV_ACT_STATUS_MASK 0x3
39 #define UV_ACT_STATUS_SIZE 2
40 #define UV_ACTIVATION_DESCRIPTOR_SIZE 32
41 #define UV_DISTRIBUTION_SIZE 256
42 #define UV_SW_ACK_NPENDING 8
43 #define UV_NET_ENDPOINT_INTD 0x38
44 #define UV_DESC_BASE_PNODE_SHIFT 49
45 #define UV_PAYLOADQ_PNODE_SHIFT 49
46 #define UV_PTC_BASENAME "sgi_uv/ptc_statistics"
47 #define uv_physnodeaddr(x) ((__pa((unsigned long)(x)) & uv_mmask))
48
49 /*
50 * bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1
51 */
52 #define DESC_STATUS_IDLE 0
53 #define DESC_STATUS_ACTIVE 1
54 #define DESC_STATUS_DESTINATION_TIMEOUT 2
55 #define DESC_STATUS_SOURCE_TIMEOUT 3
56
57 /*
58 * source side threshholds at which message retries print a warning
59 */
60 #define SOURCE_TIMEOUT_LIMIT 20
61 #define DESTINATION_TIMEOUT_LIMIT 20
62
63 /*
64 * number of entries in the destination side payload queue
65 */
66 #define DEST_Q_SIZE 17
67 /*
68 * number of destination side software ack resources
69 */
70 #define DEST_NUM_RESOURCES 8
71 #define MAX_CPUS_PER_NODE 32
72 /*
73 * completion statuses for sending a TLB flush message
74 */
75 #define FLUSH_RETRY 1
76 #define FLUSH_GIVEUP 2
77 #define FLUSH_COMPLETE 3
78
79 /*
80 * Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
81 * If the 'multilevel' flag in the header portion of the descriptor
82 * has been set to 0, then endpoint multi-unicast mode is selected.
83 * The distribution specification (32 bytes) is interpreted as a 256-bit
84 * distribution vector. Adjacent bits correspond to consecutive even numbered
85 * nodeIDs. The result of adding the index of a given bit to the 15-bit
86 * 'base_dest_nodeid' field of the header corresponds to the
87 * destination nodeID associated with that specified bit.
88 */
89 struct bau_target_nodemask {
90 unsigned long bits[BITS_TO_LONGS(256)];
91 };
92
93 /*
94 * mask of cpu's on a node
95 * (during initialization we need to check that unsigned long has
96 * enough bits for max. cpu's per node)
97 */
98 struct bau_local_cpumask {
99 unsigned long bits;
100 };
101
102 /*
103 * Payload: 16 bytes (128 bits) (bytes 0x20-0x2f of descriptor)
104 * only 12 bytes (96 bits) of the payload area are usable.
105 * An additional 3 bytes (bits 27:4) of the header address are carried
106 * to the next bytes of the destination payload queue.
107 * And an additional 2 bytes of the header Suppl_A field are also
108 * carried to the destination payload queue.
109 * But the first byte of the Suppl_A becomes bits 127:120 (the 16th byte)
110 * of the destination payload queue, which is written by the hardware
111 * with the s/w ack resource bit vector.
112 * [ effective message contents (16 bytes (128 bits) maximum), not counting
113 * the s/w ack bit vector ]
114 */
115
116 /*
117 * The payload is software-defined for INTD transactions
118 */
119 struct bau_msg_payload {
120 unsigned long address; /* signifies a page or all TLB's
121 of the cpu */
122 /* 64 bits */
123 unsigned short sending_cpu; /* filled in by sender */
124 /* 16 bits */
125 unsigned short acknowledge_count;/* filled in by destination */
126 /* 16 bits */
127 unsigned int reserved1:32; /* not usable */
128 };
129
130
131 /*
132 * Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
133 * see table 4.2.3.0.1 in broacast_assist spec.
134 */
135 struct bau_msg_header {
136 unsigned int dest_subnodeid:6; /* must be zero */
137 /* bits 5:0 */
138 unsigned int base_dest_nodeid:15; /* nasid>>1 (pnode) of */
139 /* bits 20:6 */ /* first bit in node_map */
140 unsigned int command:8; /* message type */
141 /* bits 28:21 */
142 /* 0x38: SN3net EndPoint Message */
143 unsigned int rsvd_1:3; /* must be zero */
144 /* bits 31:29 */
145 /* int will align on 32 bits */
146 unsigned int rsvd_2:9; /* must be zero */
147 /* bits 40:32 */
148 /* Suppl_A is 56-41 */
149 unsigned int payload_2a:8;/* becomes byte 16 of msg */
150 /* bits 48:41 */ /* not currently using */
151 unsigned int payload_2b:8;/* becomes byte 17 of msg */
152 /* bits 56:49 */ /* not currently using */
153 /* Address field (96:57) is never used as an
154 address (these are address bits 42:3) */
155 unsigned int rsvd_3:1; /* must be zero */
156 /* bit 57 */
157 /* address bits 27:4 are payload */
158 /* these 24 bits become bytes 12-14 of msg */
159 unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */
160 /* bit 58 */
161
162 unsigned int payload_1a:5;/* not currently used */
163 /* bits 63:59 */
164 unsigned int payload_1b:8;/* not currently used */
165 /* bits 71:64 */
166 unsigned int payload_1c:8;/* not currently used */
167 /* bits 79:72 */
168 unsigned int payload_1d:2;/* not currently used */
169 /* bits 81:80 */
170
171 unsigned int rsvd_4:7; /* must be zero */
172 /* bits 88:82 */
173 unsigned int sw_ack_flag:1;/* software acknowledge flag */
174 /* bit 89 */
175 /* INTD trasactions at destination are to
176 wait for software acknowledge */
177 unsigned int rsvd_5:6; /* must be zero */
178 /* bits 95:90 */
179 unsigned int rsvd_6:5; /* must be zero */
180 /* bits 100:96 */
181 unsigned int int_both:1;/* if 1, interrupt both sockets on the blade */
182 /* bit 101*/
183 unsigned int fairness:3;/* usually zero */
184 /* bits 104:102 */
185 unsigned int multilevel:1; /* multi-level multicast format */
186 /* bit 105 */
187 /* 0 for TLB: endpoint multi-unicast messages */
188 unsigned int chaining:1;/* next descriptor is part of this activation*/
189 /* bit 106 */
190 unsigned int rsvd_7:21; /* must be zero */
191 /* bits 127:107 */
192 };
193
194 /*
195 * The activation descriptor:
196 * The format of the message to send, plus all accompanying control
197 * Should be 64 bytes
198 */
199 struct bau_desc {
200 struct bau_target_nodemask distribution;
201 /*
202 * message template, consisting of header and payload:
203 */
204 struct bau_msg_header header;
205 struct bau_msg_payload payload;
206 };
207 /*
208 * -payload-- ---------header------
209 * bytes 0-11 bits 41-56 bits 58-81
210 * A B (2) C (3)
211 *
212 * A/B/C are moved to:
213 * A C B
214 * bytes 0-11 bytes 12-14 bytes 16-17 (byte 15 filled in by hw as vector)
215 * ------------payload queue-----------
216 */
217
218 /*
219 * The payload queue on the destination side is an array of these.
220 * With BAU_MISC_CONTROL set for software acknowledge mode, the messages
221 * are 32 bytes (2 micropackets) (256 bits) in length, but contain only 17
222 * bytes of usable data, including the sw ack vector in byte 15 (bits 127:120)
223 * (12 bytes come from bau_msg_payload, 3 from payload_1, 2 from
224 * sw_ack_vector and payload_2)
225 * "Enabling Software Acknowledgment mode (see Section 4.3.3 Software
226 * Acknowledge Processing) also selects 32 byte (17 bytes usable) payload
227 * operation."
228 */
229 struct bau_payload_queue_entry {
230 unsigned long address; /* signifies a page or all TLB's
231 of the cpu */
232 /* 64 bits, bytes 0-7 */
233
234 unsigned short sending_cpu; /* cpu that sent the message */
235 /* 16 bits, bytes 8-9 */
236
237 unsigned short acknowledge_count; /* filled in by destination */
238 /* 16 bits, bytes 10-11 */
239
240 unsigned short replied_to:1; /* sent as 0 by the source */
241 /* 1 bit */
242 unsigned short unused1:7; /* not currently using */
243 /* 7 bits: byte 12) */
244
245 unsigned char unused2[2]; /* not currently using */
246 /* bytes 13-14 */
247
248 unsigned char sw_ack_vector; /* filled in by the hardware */
249 /* byte 15 (bits 127:120) */
250
251 unsigned char unused4[3]; /* not currently using bytes 17-19 */
252 /* bytes 17-19 */
253
254 int number_of_cpus; /* filled in at destination */
255 /* 32 bits, bytes 20-23 (aligned) */
256
257 unsigned char unused5[8]; /* not using */
258 /* bytes 24-31 */
259 };
260
261 /*
262 * one for every slot in the destination payload queue
263 */
264 struct bau_msg_status {
265 struct bau_local_cpumask seen_by; /* map of cpu's */
266 };
267
268 /*
269 * one for every slot in the destination software ack resources
270 */
271 struct bau_sw_ack_status {
272 struct bau_payload_queue_entry *msg; /* associated message */
273 int watcher; /* cpu monitoring, or -1 */
274 };
275
276 /*
277 * one on every node and per-cpu; to locate the software tables
278 */
279 struct bau_control {
280 struct bau_desc *descriptor_base;
281 struct bau_payload_queue_entry *bau_msg_head;
282 struct bau_payload_queue_entry *va_queue_first;
283 struct bau_payload_queue_entry *va_queue_last;
284 struct bau_msg_status *msg_statuses;
285 int *watching; /* pointer to array */
286 };
287
288 /*
289 * This structure is allocated per_cpu for UV TLB shootdown statistics.
290 */
291 struct ptc_stats {
292 unsigned long ptc_i; /* number of IPI-style flushes */
293 unsigned long requestor; /* number of nodes this cpu sent to */
294 unsigned long requestee; /* times cpu was remotely requested */
295 unsigned long alltlb; /* times all tlb's on this cpu were flushed */
296 unsigned long onetlb; /* times just one tlb on this cpu was flushed */
297 unsigned long s_retry; /* retries on source side timeouts */
298 unsigned long d_retry; /* retries on destination side timeouts */
299 unsigned long sflush; /* cycles spent in uv_flush_tlb_others */
300 unsigned long dflush; /* cycles spent on destination side */
301 unsigned long retriesok; /* successes on retries */
302 unsigned long nomsg; /* interrupts with no message */
303 unsigned long multmsg; /* interrupts with multiple messages */
304 unsigned long ntargeted;/* nodes targeted */
305 };
306
bau_node_isset(int node,struct bau_target_nodemask * dstp)307 static inline int bau_node_isset(int node, struct bau_target_nodemask *dstp)
308 {
309 return constant_test_bit(node, &dstp->bits[0]);
310 }
bau_node_set(int node,struct bau_target_nodemask * dstp)311 static inline void bau_node_set(int node, struct bau_target_nodemask *dstp)
312 {
313 __set_bit(node, &dstp->bits[0]);
314 }
bau_nodes_clear(struct bau_target_nodemask * dstp,int nbits)315 static inline void bau_nodes_clear(struct bau_target_nodemask *dstp, int nbits)
316 {
317 bitmap_zero(&dstp->bits[0], nbits);
318 }
319
bau_cpubits_clear(struct bau_local_cpumask * dstp,int nbits)320 static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
321 {
322 bitmap_zero(&dstp->bits, nbits);
323 }
324
325 #define cpubit_isset(cpu, bau_local_cpumask) \
326 test_bit((cpu), (bau_local_cpumask).bits)
327
328 extern int uv_flush_tlb_others(cpumask_t *, struct mm_struct *, unsigned long);
329 extern void uv_bau_message_intr1(void);
330 extern void uv_bau_timeout_intr1(void);
331
332 #endif /* _ASM_X86_UV_UV_BAU_H */
333