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 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP
7 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
11 * Cross Partition Communication (XPC) partition support.
13 * This is the part of XPC that detects the presence/absence of
14 * other partitions. It provides a heartbeat and monitors the
15 * heartbeats of other partitions.
19 #include <linux/device.h>
20 #include <linux/hardirq.h>
21 #include <linux/slab.h>
23 #include <asm/uv/uv_hub.h>
25 /* XPC is exiting flag */
28 /* this partition's reserved page pointers */
29 struct xpc_rsvd_page *xpc_rsvd_page;
30 static unsigned long *xpc_part_nasids;
31 unsigned long *xpc_mach_nasids;
33 static int xpc_nasid_mask_nbytes; /* #of bytes in nasid mask */
34 int xpc_nasid_mask_nlongs; /* #of longs in nasid mask */
36 struct xpc_partition *xpc_partitions;
39 * Guarantee that the kmalloc'd memory is cacheline aligned.
42 xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
44 /* see if kmalloc will give us cachline aligned memory by default */
45 *base = kmalloc(size, flags);
49 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
54 /* nope, we'll have to do it ourselves */
55 *base = kmalloc(size + L1_CACHE_BYTES, flags);
59 return (void *)L1_CACHE_ALIGN((u64)*base);
63 * Given a nasid, get the physical address of the partition's reserved page
64 * for that nasid. This function returns 0 on any error.
67 xpc_get_rsvd_page_pa(int nasid)
71 unsigned long rp_pa = nasid; /* seed with nasid */
75 void *buf_base = NULL;
76 enum xp_retval (*get_partition_rsvd_page_pa)
77 (void *, u64 *, unsigned long *, size_t *) =
78 xpc_arch_ops.get_partition_rsvd_page_pa;
82 /* !!! rp_pa will need to be _gpa on UV.
83 * ??? So do we save it into the architecture specific parts
84 * ??? of the xpc_partition structure? Do we rename this
85 * ??? function or have two versions? Rename rp_pa for UV to
88 ret = get_partition_rsvd_page_pa(buf, &cookie, &rp_pa, &len);
90 dev_dbg(xpc_part, "SAL returned with ret=%d, cookie=0x%016lx, "
91 "address=0x%016lx, len=0x%016lx\n", ret,
92 (unsigned long)cookie, rp_pa, len);
94 if (ret != xpNeedMoreInfo)
99 buf_len = L1_CACHE_ALIGN(len);
100 buf = xpc_kmalloc_cacheline_aligned(buf_len, GFP_KERNEL,
102 if (buf_base == NULL) {
103 dev_err(xpc_part, "unable to kmalloc "
104 "len=0x%016lx\n", buf_len);
110 ret = xp_remote_memcpy(xp_pa(buf), rp_pa, len);
111 if (ret != xpSuccess) {
112 dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret);
119 if (ret != xpSuccess)
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
132 xpc_setup_rsvd_page(void)
135 struct xpc_rsvd_page *rp;
137 unsigned long new_ts_jiffies;
139 /* get the local reserved page's address */
142 rp_pa = xpc_get_rsvd_page_pa(xp_cpu_to_nasid(smp_processor_id()));
145 dev_err(xpc_part, "SAL failed to locate the reserved page\n");
148 rp = (struct xpc_rsvd_page *)__va(xp_socket_pa(rp_pa));
150 if (rp->SAL_version < 3) {
151 /* SAL_versions < 3 had a SAL_partid defined as a u8 */
152 rp->SAL_partid &= 0xff;
154 BUG_ON(rp->SAL_partid != xp_partition_id);
156 if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) {
157 dev_err(xpc_part, "the reserved page's partid of %d is outside "
158 "supported range (< 0 || >= %d)\n", rp->SAL_partid,
163 rp->version = XPC_RP_VERSION;
164 rp->max_npartitions = xp_max_npartitions;
166 /* establish the actual sizes of the nasid masks */
167 if (rp->SAL_version == 1) {
168 /* SAL_version 1 didn't set the nasids_size field */
169 rp->SAL_nasids_size = 128;
171 xpc_nasid_mask_nbytes = rp->SAL_nasids_size;
172 xpc_nasid_mask_nlongs = BITS_TO_LONGS(rp->SAL_nasids_size *
175 /* setup the pointers to the various items in the reserved page */
176 xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
177 xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
179 ret = xpc_arch_ops.setup_rsvd_page(rp);
184 * Set timestamp of when reserved page was setup by XPC.
185 * This signifies to the remote partition that our reserved
186 * page is initialized.
188 new_ts_jiffies = jiffies;
189 if (new_ts_jiffies == 0 || new_ts_jiffies == rp->ts_jiffies)
191 rp->ts_jiffies = new_ts_jiffies;
198 xpc_teardown_rsvd_page(void)
200 /* a zero timestamp indicates our rsvd page is not initialized */
201 xpc_rsvd_page->ts_jiffies = 0;
205 * Get a copy of a portion of the remote partition's rsvd page.
207 * remote_rp points to a buffer that is cacheline aligned for BTE copies and
208 * is large enough to contain a copy of their reserved page header and
212 xpc_get_remote_rp(int nasid, unsigned long *discovered_nasids,
213 struct xpc_rsvd_page *remote_rp, unsigned long *remote_rp_pa)
218 /* get the reserved page's physical address */
220 *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
221 if (*remote_rp_pa == 0)
222 return xpNoRsvdPageAddr;
224 /* pull over the reserved page header and part_nasids mask */
225 ret = xp_remote_memcpy(xp_pa(remote_rp), *remote_rp_pa,
226 XPC_RP_HEADER_SIZE + xpc_nasid_mask_nbytes);
227 if (ret != xpSuccess)
230 if (discovered_nasids != NULL) {
231 unsigned long *remote_part_nasids =
232 XPC_RP_PART_NASIDS(remote_rp);
234 for (l = 0; l < xpc_nasid_mask_nlongs; l++)
235 discovered_nasids[l] |= remote_part_nasids[l];
238 /* zero timestamp indicates the reserved page has not been setup */
239 if (remote_rp->ts_jiffies == 0)
240 return xpRsvdPageNotSet;
242 if (XPC_VERSION_MAJOR(remote_rp->version) !=
243 XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
247 /* check that both remote and local partids are valid for each side */
248 if (remote_rp->SAL_partid < 0 ||
249 remote_rp->SAL_partid >= xp_max_npartitions ||
250 remote_rp->max_npartitions <= xp_partition_id) {
251 return xpInvalidPartid;
254 if (remote_rp->SAL_partid == xp_partition_id)
255 return xpLocalPartid;
261 * See if the other side has responded to a partition deactivate request
262 * from us. Though we requested the remote partition to deactivate with regard
263 * to us, we really only need to wait for the other side to disengage from us.
265 static int __xpc_partition_disengaged(struct xpc_partition *part,
268 short partid = XPC_PARTID(part);
271 disengaged = !xpc_arch_ops.partition_engaged(partid);
272 if (part->disengage_timeout) {
274 if (time_is_after_jiffies(part->disengage_timeout)) {
275 /* timelimit hasn't been reached yet */
280 * Other side hasn't responded to our deactivate
281 * request in a timely fashion, so assume it's dead.
284 dev_info(xpc_part, "deactivate request to remote "
285 "partition %d timed out\n", partid);
286 xpc_disengage_timedout = 1;
287 xpc_arch_ops.assume_partition_disengaged(partid);
290 part->disengage_timeout = 0;
292 /* Cancel the timer function if not called from it */
294 del_timer_sync(&part->disengage_timer);
296 DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING &&
297 part->act_state != XPC_P_AS_INACTIVE);
298 if (part->act_state != XPC_P_AS_INACTIVE)
299 xpc_wakeup_channel_mgr(part);
301 xpc_arch_ops.cancel_partition_deactivation_request(part);
306 int xpc_partition_disengaged(struct xpc_partition *part)
308 return __xpc_partition_disengaged(part, false);
311 int xpc_partition_disengaged_from_timer(struct xpc_partition *part)
313 return __xpc_partition_disengaged(part, true);
317 * Mark specified partition as active.
320 xpc_mark_partition_active(struct xpc_partition *part)
322 unsigned long irq_flags;
325 dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
327 spin_lock_irqsave(&part->act_lock, irq_flags);
328 if (part->act_state == XPC_P_AS_ACTIVATING) {
329 part->act_state = XPC_P_AS_ACTIVE;
332 DBUG_ON(part->reason == xpSuccess);
335 spin_unlock_irqrestore(&part->act_lock, irq_flags);
341 * Start the process of deactivating the specified partition.
344 xpc_deactivate_partition(const int line, struct xpc_partition *part,
345 enum xp_retval reason)
347 unsigned long irq_flags;
349 spin_lock_irqsave(&part->act_lock, irq_flags);
351 if (part->act_state == XPC_P_AS_INACTIVE) {
352 XPC_SET_REASON(part, reason, line);
353 spin_unlock_irqrestore(&part->act_lock, irq_flags);
354 if (reason == xpReactivating) {
355 /* we interrupt ourselves to reactivate partition */
356 xpc_arch_ops.request_partition_reactivation(part);
360 if (part->act_state == XPC_P_AS_DEACTIVATING) {
361 if ((part->reason == xpUnloading && reason != xpUnloading) ||
362 reason == xpReactivating) {
363 XPC_SET_REASON(part, reason, line);
365 spin_unlock_irqrestore(&part->act_lock, irq_flags);
369 part->act_state = XPC_P_AS_DEACTIVATING;
370 XPC_SET_REASON(part, reason, line);
372 spin_unlock_irqrestore(&part->act_lock, irq_flags);
374 /* ask remote partition to deactivate with regard to us */
375 xpc_arch_ops.request_partition_deactivation(part);
377 /* set a timelimit on the disengage phase of the deactivation request */
378 part->disengage_timeout = jiffies + (xpc_disengage_timelimit * HZ);
379 part->disengage_timer.expires = part->disengage_timeout;
380 add_timer(&part->disengage_timer);
382 dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
383 XPC_PARTID(part), reason);
385 xpc_partition_going_down(part, reason);
389 * Mark specified partition as inactive.
392 xpc_mark_partition_inactive(struct xpc_partition *part)
394 unsigned long irq_flags;
396 dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
399 spin_lock_irqsave(&part->act_lock, irq_flags);
400 part->act_state = XPC_P_AS_INACTIVE;
401 spin_unlock_irqrestore(&part->act_lock, irq_flags);
402 part->remote_rp_pa = 0;
406 * SAL has provided a partition and machine mask. The partition mask
407 * contains a bit for each even nasid in our partition. The machine
408 * mask contains a bit for each even nasid in the entire machine.
410 * Using those two bit arrays, we can determine which nasids are
411 * known in the machine. Each should also have a reserved page
412 * initialized if they are available for partitioning.
417 void *remote_rp_base;
418 struct xpc_rsvd_page *remote_rp;
419 unsigned long remote_rp_pa;
424 unsigned long *discovered_nasids;
427 remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
428 xpc_nasid_mask_nbytes,
429 GFP_KERNEL, &remote_rp_base);
430 if (remote_rp == NULL)
433 discovered_nasids = kcalloc(xpc_nasid_mask_nlongs, sizeof(long),
435 if (discovered_nasids == NULL) {
436 kfree(remote_rp_base);
441 * The term 'region' in this context refers to the minimum number of
442 * nodes that can comprise an access protection grouping. The access
443 * protection is in regards to memory, IOI and IPI.
445 region_size = xp_region_size;
452 switch (region_size) {
465 for (region = 0; region < max_regions; region++) {
470 dev_dbg(xpc_part, "searching region %d\n", region);
472 for (nasid = (region * region_size * 2);
473 nasid < ((region + 1) * region_size * 2); nasid += 2) {
478 dev_dbg(xpc_part, "checking nasid %d\n", nasid);
480 if (test_bit(nasid / 2, xpc_part_nasids)) {
481 dev_dbg(xpc_part, "PROM indicates Nasid %d is "
482 "part of the local partition; skipping "
487 if (!(test_bit(nasid / 2, xpc_mach_nasids))) {
488 dev_dbg(xpc_part, "PROM indicates Nasid %d was "
489 "not on Numa-Link network at reset\n",
494 if (test_bit(nasid / 2, discovered_nasids)) {
495 dev_dbg(xpc_part, "Nasid %d is part of a "
496 "partition which was previously "
497 "discovered\n", nasid);
501 /* pull over the rsvd page header & part_nasids mask */
503 ret = xpc_get_remote_rp(nasid, discovered_nasids,
504 remote_rp, &remote_rp_pa);
505 if (ret != xpSuccess) {
506 dev_dbg(xpc_part, "unable to get reserved page "
507 "from nasid %d, reason=%d\n", nasid,
510 if (ret == xpLocalPartid)
516 xpc_arch_ops.request_partition_activation(remote_rp,
517 remote_rp_pa, nasid);
521 kfree(discovered_nasids);
522 kfree(remote_rp_base);
526 * Given a partid, get the nasids owned by that partition from the
527 * remote partition's reserved page.
530 xpc_initiate_partid_to_nasids(short partid, void *nasid_mask)
532 struct xpc_partition *part;
533 unsigned long part_nasid_pa;
535 part = &xpc_partitions[partid];
536 if (part->remote_rp_pa == 0)
537 return xpPartitionDown;
539 memset(nasid_mask, 0, xpc_nasid_mask_nbytes);
541 part_nasid_pa = (unsigned long)XPC_RP_PART_NASIDS(part->remote_rp_pa);
543 return xp_remote_memcpy(xp_pa(nasid_mask), part_nasid_pa,
544 xpc_nasid_mask_nbytes);