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
6 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
10 * Cross Partition Communication (XPC) partition support.
12 * This is the part of XPC that detects the presence/absence of
13 * other partitions. It provides a heartbeat and monitors the
14 * heartbeats of other partitions.
18 #include <linux/kernel.h>
19 #include <linux/sysctl.h>
20 #include <linux/cache.h>
21 #include <linux/mmzone.h>
22 #include <linux/nodemask.h>
23 #include <asm/sn/intr.h>
24 #include <asm/sn/sn_sal.h>
25 #include <asm/sn/nodepda.h>
26 #include <asm/sn/addrs.h>
29 /* XPC is exiting flag */
32 /* this partition's reserved page pointers */
33 struct xpc_rsvd_page *xpc_rsvd_page;
34 static u64 *xpc_part_nasids;
37 static int xpc_sizeof_nasid_mask; /* actual size in bytes of nasid mask */
38 int xpc_nasid_mask_words; /* actual size in words of nasid mask */
40 struct xpc_partition *xpc_partitions;
43 * Guarantee that the kmalloc'd memory is cacheline aligned.
46 xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
48 /* see if kmalloc will give us cachline aligned memory by default */
49 *base = kmalloc(size, flags);
53 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
58 /* nope, we'll have to do it ourselves */
59 *base = kmalloc(size + L1_CACHE_BYTES, flags);
63 return (void *)L1_CACHE_ALIGN((u64)*base);
67 * Given a nasid, get the physical address of the partition's reserved page
68 * for that nasid. This function returns 0 on any error.
71 xpc_get_rsvd_page_pa(int nasid)
76 u64 rp_pa = nasid; /* seed with nasid */
80 void *buf_base = NULL;
84 status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
87 dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
88 "0x%016lx, address=0x%016lx, len=0x%016lx\n",
89 status, cookie, rp_pa, len);
91 if (status != SALRET_MORE_PASSES)
94 /* !!! L1_CACHE_ALIGN() is only a sn2-bte_copy requirement */
95 if (L1_CACHE_ALIGN(len) > buf_len) {
97 buf_len = L1_CACHE_ALIGN(len);
98 buf = (u64)xpc_kmalloc_cacheline_aligned(buf_len,
101 if (buf_base == NULL) {
102 dev_err(xpc_part, "unable to kmalloc "
103 "len=0x%016lx\n", buf_len);
104 status = SALRET_ERROR;
109 ret = xp_remote_memcpy((void *)buf, (void *)rp_pa, buf_len);
110 if (ret != xpSuccess) {
111 dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret);
112 status = SALRET_ERROR;
119 if (status != SALRET_OK)
122 dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
127 * Fill the partition reserved page with the information needed by
128 * other partitions to discover we are alive and establish initial
131 struct xpc_rsvd_page *
132 xpc_setup_rsvd_page(void)
134 struct xpc_rsvd_page *rp;
136 unsigned long new_stamp;
138 /* get the local reserved page's address */
141 rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
144 dev_err(xpc_part, "SAL failed to locate the reserved page\n");
147 rp = (struct xpc_rsvd_page *)__va(rp_pa);
149 if (rp->SAL_version < 3) {
150 /* SAL_versions < 3 had a SAL_partid defined as a u8 */
151 rp->SAL_partid &= 0xff;
153 BUG_ON(rp->SAL_partid != sn_partition_id);
155 if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) {
156 dev_err(xpc_part, "the reserved page's partid of %d is outside "
157 "supported range (< 0 || >= %d)\n", rp->SAL_partid,
162 rp->version = XPC_RP_VERSION;
163 rp->max_npartitions = xp_max_npartitions;
165 /* establish the actual sizes of the nasid masks */
166 if (rp->SAL_version == 1) {
167 /* SAL_version 1 didn't set the nasids_size field */
168 rp->SAL_nasids_size = 128;
170 xpc_sizeof_nasid_mask = rp->SAL_nasids_size;
171 xpc_nasid_mask_words = DIV_ROUND_UP(xpc_sizeof_nasid_mask,
174 /* setup the pointers to the various items in the reserved page */
175 xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
176 xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
178 if (xpc_rsvd_page_init(rp) != xpSuccess)
182 * Set timestamp of when reserved page was setup by XPC.
183 * This signifies to the remote partition that our reserved
184 * page is initialized.
187 if (new_stamp == 0 || new_stamp == rp->stamp)
189 rp->stamp = new_stamp;
195 * Get a copy of a portion of the remote partition's rsvd page.
197 * remote_rp points to a buffer that is cacheline aligned for BTE copies and
198 * is large enough to contain a copy of their reserved page header and
202 xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
203 struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
208 /* get the reserved page's physical address */
210 *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
211 if (*remote_rp_pa == 0)
212 return xpNoRsvdPageAddr;
214 /* pull over the reserved page header and part_nasids mask */
215 ret = xp_remote_memcpy(remote_rp, (void *)*remote_rp_pa,
216 XPC_RP_HEADER_SIZE + xpc_sizeof_nasid_mask);
217 if (ret != xpSuccess)
220 if (discovered_nasids != NULL) {
221 u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
223 for (i = 0; i < xpc_nasid_mask_words; i++)
224 discovered_nasids[i] |= remote_part_nasids[i];
227 /* see if the reserved page has been set up by XPC */
228 if (remote_rp->stamp == 0)
229 return xpRsvdPageNotSet;
231 if (XPC_VERSION_MAJOR(remote_rp->version) !=
232 XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
236 /* check that both remote and local partids are valid for each side */
237 if (remote_rp->SAL_partid < 0 ||
238 remote_rp->SAL_partid >= xp_max_npartitions ||
239 remote_rp->max_npartitions <= sn_partition_id) {
240 return xpInvalidPartid;
243 if (remote_rp->SAL_partid == sn_partition_id)
244 return xpLocalPartid;
250 * See if the other side has responded to a partition deactivate request
251 * from us. Though we requested the remote partition to deactivate with regard
252 * to us, we really only need to wait for the other side to disengage from us.
255 xpc_partition_disengaged(struct xpc_partition *part)
257 short partid = XPC_PARTID(part);
260 disengaged = !xpc_partition_engaged(partid);
261 if (part->disengage_timeout) {
263 if (time_is_after_jiffies(part->disengage_timeout)) {
264 /* timelimit hasn't been reached yet */
269 * Other side hasn't responded to our deactivate
270 * request in a timely fashion, so assume it's dead.
273 dev_info(xpc_part, "deactivate request to remote "
274 "partition %d timed out\n", partid);
275 xpc_disengage_timedout = 1;
276 xpc_assume_partition_disengaged(partid);
279 part->disengage_timeout = 0;
281 /* cancel the timer function, provided it's not us */
283 del_singleshot_timer_sync(&part->disengage_timer);
285 DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
286 part->act_state != XPC_P_INACTIVE);
287 if (part->act_state != XPC_P_INACTIVE)
288 xpc_wakeup_channel_mgr(part);
290 xpc_cancel_partition_deactivation_request(part);
296 * Mark specified partition as active.
299 xpc_mark_partition_active(struct xpc_partition *part)
301 unsigned long irq_flags;
304 dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
306 spin_lock_irqsave(&part->act_lock, irq_flags);
307 if (part->act_state == XPC_P_ACTIVATING) {
308 part->act_state = XPC_P_ACTIVE;
311 DBUG_ON(part->reason == xpSuccess);
314 spin_unlock_irqrestore(&part->act_lock, irq_flags);
320 * Start the process of deactivating the specified partition.
323 xpc_deactivate_partition(const int line, struct xpc_partition *part,
324 enum xp_retval reason)
326 unsigned long irq_flags;
328 spin_lock_irqsave(&part->act_lock, irq_flags);
330 if (part->act_state == XPC_P_INACTIVE) {
331 XPC_SET_REASON(part, reason, line);
332 spin_unlock_irqrestore(&part->act_lock, irq_flags);
333 if (reason == xpReactivating) {
334 /* we interrupt ourselves to reactivate partition */
335 xpc_request_partition_reactivation(part);
339 if (part->act_state == XPC_P_DEACTIVATING) {
340 if ((part->reason == xpUnloading && reason != xpUnloading) ||
341 reason == xpReactivating) {
342 XPC_SET_REASON(part, reason, line);
344 spin_unlock_irqrestore(&part->act_lock, irq_flags);
348 part->act_state = XPC_P_DEACTIVATING;
349 XPC_SET_REASON(part, reason, line);
351 spin_unlock_irqrestore(&part->act_lock, irq_flags);
353 /* ask remote partition to deactivate with regard to us */
354 xpc_request_partition_deactivation(part);
356 /* set a timelimit on the disengage phase of the deactivation request */
357 part->disengage_timeout = jiffies + (xpc_disengage_timelimit * HZ);
358 part->disengage_timer.expires = part->disengage_timeout;
359 add_timer(&part->disengage_timer);
361 dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
362 XPC_PARTID(part), reason);
364 xpc_partition_going_down(part, reason);
368 * Mark specified partition as inactive.
371 xpc_mark_partition_inactive(struct xpc_partition *part)
373 unsigned long irq_flags;
375 dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
378 spin_lock_irqsave(&part->act_lock, irq_flags);
379 part->act_state = XPC_P_INACTIVE;
380 spin_unlock_irqrestore(&part->act_lock, irq_flags);
381 part->remote_rp_pa = 0;
385 * SAL has provided a partition and machine mask. The partition mask
386 * contains a bit for each even nasid in our partition. The machine
387 * mask contains a bit for each even nasid in the entire machine.
389 * Using those two bit arrays, we can determine which nasids are
390 * known in the machine. Each should also have a reserved page
391 * initialized if they are available for partitioning.
396 void *remote_rp_base;
397 struct xpc_rsvd_page *remote_rp;
403 struct xpc_rsvd_page *rp;
404 u64 *discovered_nasids;
407 remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
408 xpc_sizeof_nasid_mask,
409 GFP_KERNEL, &remote_rp_base);
410 if (remote_rp == NULL)
413 discovered_nasids = kzalloc(sizeof(u64) * xpc_nasid_mask_words,
415 if (discovered_nasids == NULL) {
416 kfree(remote_rp_base);
420 rp = (struct xpc_rsvd_page *)xpc_rsvd_page;
423 * The term 'region' in this context refers to the minimum number of
424 * nodes that can comprise an access protection grouping. The access
425 * protection is in regards to memory, IOI and IPI.
428 region_size = sn_region_size;
430 switch (region_size) {
438 DBUG_ON(!is_shub2());
441 for (region = 0; region < max_regions; region++) {
446 dev_dbg(xpc_part, "searching region %d\n", region);
448 for (nasid = (region * region_size * 2);
449 nasid < ((region + 1) * region_size * 2); nasid += 2) {
454 dev_dbg(xpc_part, "checking nasid %d\n", nasid);
456 if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
457 dev_dbg(xpc_part, "PROM indicates Nasid %d is "
458 "part of the local partition; skipping "
463 if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
464 dev_dbg(xpc_part, "PROM indicates Nasid %d was "
465 "not on Numa-Link network at reset\n",
470 if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
471 dev_dbg(xpc_part, "Nasid %d is part of a "
472 "partition which was previously "
473 "discovered\n", nasid);
477 /* pull over the rsvd page header & part_nasids mask */
479 ret = xpc_get_remote_rp(nasid, discovered_nasids,
480 remote_rp, &remote_rp_pa);
481 if (ret != xpSuccess) {
482 dev_dbg(xpc_part, "unable to get reserved page "
483 "from nasid %d, reason=%d\n", nasid,
486 if (ret == xpLocalPartid)
492 xpc_request_partition_activation(remote_rp,
493 remote_rp_pa, nasid);
497 kfree(discovered_nasids);
498 kfree(remote_rp_base);
502 * Given a partid, get the nasids owned by that partition from the
503 * remote partition's reserved page.
506 xpc_initiate_partid_to_nasids(short partid, void *nasid_mask)
508 struct xpc_partition *part;
511 part = &xpc_partitions[partid];
512 if (part->remote_rp_pa == 0)
513 return xpPartitionDown;
515 memset(nasid_mask, 0, xpc_sizeof_nasid_mask);
517 part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa);
519 return xp_remote_memcpy(nasid_mask, (void *)part_nasid_pa,
520 xpc_sizeof_nasid_mask);