blob: d551f09ccb792175d49a83c4a929df7394f50a8a [file] [log] [blame]
Dean Nelson89eb8eb2005-03-23 19:50:00 -07001/*
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 *
Dean Nelson45d9ca42008-04-22 14:46:56 -05006 * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
Dean Nelson89eb8eb2005-03-23 19:50:00 -07007 */
8
Dean Nelson89eb8eb2005-03-23 19:50:00 -07009/*
10 * Cross Partition Communication (XPC) partition support.
11 *
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.
15 *
16 */
17
Dean Nelson261f3b42008-07-29 22:34:16 -070018#include <linux/device.h>
19#include <linux/hardirq.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Dean Nelson45d9ca42008-04-22 14:46:56 -050021#include "xpc.h"
Robin Holtc2c9f112009-12-15 16:47:56 -080022#include <asm/uv/uv_hub.h>
Dean Nelson89eb8eb2005-03-23 19:50:00 -070023
Dean Nelson89eb8eb2005-03-23 19:50:00 -070024/* XPC is exiting flag */
25int xpc_exiting;
26
Dean Nelson4b38fcd2005-10-25 14:09:51 -050027/* this partition's reserved page pointers */
Dean Nelson89eb8eb2005-03-23 19:50:00 -070028struct xpc_rsvd_page *xpc_rsvd_page;
Dean Nelson04de7412008-07-29 22:34:14 -070029static unsigned long *xpc_part_nasids;
30unsigned long *xpc_mach_nasids;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070031
Dean Nelson04de7412008-07-29 22:34:14 -070032static int xpc_nasid_mask_nbytes; /* #of bytes in nasid mask */
33int xpc_nasid_mask_nlongs; /* #of longs in nasid mask */
Dean Nelson4b38fcd2005-10-25 14:09:51 -050034
Dean Nelsonbc63d382008-07-29 22:34:04 -070035struct xpc_partition *xpc_partitions;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070036
Dean Nelson89eb8eb2005-03-23 19:50:00 -070037/*
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050038 * Guarantee that the kmalloc'd memory is cacheline aligned.
39 */
Dean Nelson7682a4c2006-08-08 15:03:29 -050040void *
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050041xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
42{
43 /* see if kmalloc will give us cachline aligned memory by default */
44 *base = kmalloc(size, flags);
Dean Nelson2c2b94f2008-04-22 14:50:17 -050045 if (*base == NULL)
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050046 return NULL;
Dean Nelson2c2b94f2008-04-22 14:50:17 -050047
48 if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050049 return *base;
Dean Nelson2c2b94f2008-04-22 14:50:17 -050050
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050051 kfree(*base);
52
53 /* nope, we'll have to do it ourselves */
54 *base = kmalloc(size + L1_CACHE_BYTES, flags);
Dean Nelson2c2b94f2008-04-22 14:50:17 -050055 if (*base == NULL)
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050056 return NULL;
Dean Nelson2c2b94f2008-04-22 14:50:17 -050057
Dean Nelson4a3ad2d2008-04-22 14:48:01 -050058 return (void *)L1_CACHE_ALIGN((u64)*base);
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050059}
60
Jes Sorensen7aa6ba42006-02-17 05:18:43 -050061/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -070062 * Given a nasid, get the physical address of the partition's reserved page
63 * for that nasid. This function returns 0 on any error.
64 */
Dean Nelsona812dcc2008-07-29 22:34:16 -070065static unsigned long
Dean Nelson27929022005-10-25 14:11:53 -050066xpc_get_rsvd_page_pa(int nasid)
Dean Nelson89eb8eb2005-03-23 19:50:00 -070067{
Dean Nelson908787d2008-07-29 22:34:05 -070068 enum xp_retval ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070069 u64 cookie = 0;
Dean Nelsona812dcc2008-07-29 22:34:16 -070070 unsigned long rp_pa = nasid; /* seed with nasid */
Dean Nelson261f3b42008-07-29 22:34:16 -070071 size_t len = 0;
Dean Nelsona812dcc2008-07-29 22:34:16 -070072 size_t buf_len = 0;
73 void *buf = buf;
Dean Nelson27929022005-10-25 14:11:53 -050074 void *buf_base = NULL;
Robin Holta7665b02009-04-13 14:40:19 -070075 enum xp_retval (*get_partition_rsvd_page_pa)
76 (void *, u64 *, unsigned long *, size_t *) =
77 xpc_arch_ops.get_partition_rsvd_page_pa;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070078
Dean Nelson89eb8eb2005-03-23 19:50:00 -070079 while (1) {
80
Dean Nelson5b8669d2008-07-29 22:34:18 -070081 /* !!! rp_pa will need to be _gpa on UV.
82 * ??? So do we save it into the architecture specific parts
83 * ??? of the xpc_partition structure? Do we rename this
84 * ??? function or have two versions? Rename rp_pa for UV to
85 * ??? rp_gpa?
86 */
Robin Holta7665b02009-04-13 14:40:19 -070087 ret = get_partition_rsvd_page_pa(buf, &cookie, &rp_pa, &len);
Dean Nelson89eb8eb2005-03-23 19:50:00 -070088
Dean Nelson261f3b42008-07-29 22:34:16 -070089 dev_dbg(xpc_part, "SAL returned with ret=%d, cookie=0x%016lx, "
90 "address=0x%016lx, len=0x%016lx\n", ret,
Dean Nelsona812dcc2008-07-29 22:34:16 -070091 (unsigned long)cookie, rp_pa, len);
Dean Nelson89eb8eb2005-03-23 19:50:00 -070092
Dean Nelson261f3b42008-07-29 22:34:16 -070093 if (ret != xpNeedMoreInfo)
Dean Nelson89eb8eb2005-03-23 19:50:00 -070094 break;
Dean Nelson89eb8eb2005-03-23 19:50:00 -070095
Dean Nelsonea57f802008-07-29 22:34:14 -070096 /* !!! L1_CACHE_ALIGN() is only a sn2-bte_copy requirement */
Robin Holtc2c9f112009-12-15 16:47:56 -080097 if (is_shub())
98 len = L1_CACHE_ALIGN(len);
99
100 if (len > buf_len) {
101 if (buf_base != NULL)
102 kfree(buf_base);
Dean Nelson27929022005-10-25 14:11:53 -0500103 buf_len = L1_CACHE_ALIGN(len);
Dean Nelsona812dcc2008-07-29 22:34:16 -0700104 buf = xpc_kmalloc_cacheline_aligned(buf_len, GFP_KERNEL,
105 &buf_base);
Dean Nelson27929022005-10-25 14:11:53 -0500106 if (buf_base == NULL) {
107 dev_err(xpc_part, "unable to kmalloc "
Dean Nelsona812dcc2008-07-29 22:34:16 -0700108 "len=0x%016lx\n", buf_len);
Dean Nelson261f3b42008-07-29 22:34:16 -0700109 ret = xpNoMemory;
Dean Nelson27929022005-10-25 14:11:53 -0500110 break;
111 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700112 }
113
Robin Holtc2c9f112009-12-15 16:47:56 -0800114 ret = xp_remote_memcpy(xp_pa(buf), rp_pa, len);
Dean Nelson908787d2008-07-29 22:34:05 -0700115 if (ret != xpSuccess) {
116 dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700117 break;
118 }
119 }
120
Jesper Juhlcbf283c2006-04-20 10:11:09 -0700121 kfree(buf_base);
Dean Nelson27929022005-10-25 14:11:53 -0500122
Dean Nelson261f3b42008-07-29 22:34:16 -0700123 if (ret != xpSuccess)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700124 rp_pa = 0;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500125
Dean Nelsona812dcc2008-07-29 22:34:16 -0700126 dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700127 return rp_pa;
128}
129
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700130/*
131 * Fill the partition reserved page with the information needed by
132 * other partitions to discover we are alive and establish initial
133 * communications.
134 */
Dean Nelson5b8669d2008-07-29 22:34:18 -0700135int
Dean Nelson94bd2702008-07-29 22:34:05 -0700136xpc_setup_rsvd_page(void)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700137{
Dean Nelson5b8669d2008-07-29 22:34:18 -0700138 int ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700139 struct xpc_rsvd_page *rp;
Dean Nelsona812dcc2008-07-29 22:34:16 -0700140 unsigned long rp_pa;
Dean Nelson81fe7882008-07-29 22:34:15 -0700141 unsigned long new_ts_jiffies;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700142
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700143 /* get the local reserved page's address */
144
Dean Nelson27929022005-10-25 14:11:53 -0500145 preempt_disable();
Dean Nelson261f3b42008-07-29 22:34:16 -0700146 rp_pa = xpc_get_rsvd_page_pa(xp_cpu_to_nasid(smp_processor_id()));
Dean Nelson27929022005-10-25 14:11:53 -0500147 preempt_enable();
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700148 if (rp_pa == 0) {
149 dev_err(xpc_part, "SAL failed to locate the reserved page\n");
Dean Nelson5b8669d2008-07-29 22:34:18 -0700150 return -ESRCH;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700151 }
Robin Holtc2c9f112009-12-15 16:47:56 -0800152 rp = (struct xpc_rsvd_page *)__va(xp_socket_pa(rp_pa));
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700153
Dean Nelson94bd2702008-07-29 22:34:05 -0700154 if (rp->SAL_version < 3) {
155 /* SAL_versions < 3 had a SAL_partid defined as a u8 */
156 rp->SAL_partid &= 0xff;
157 }
Dean Nelson261f3b42008-07-29 22:34:16 -0700158 BUG_ON(rp->SAL_partid != xp_partition_id);
Dean Nelson94bd2702008-07-29 22:34:05 -0700159
160 if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) {
161 dev_err(xpc_part, "the reserved page's partid of %d is outside "
162 "supported range (< 0 || >= %d)\n", rp->SAL_partid,
163 xp_max_npartitions);
Dean Nelson5b8669d2008-07-29 22:34:18 -0700164 return -EINVAL;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700165 }
166
167 rp->version = XPC_RP_VERSION;
Dean Nelson94bd2702008-07-29 22:34:05 -0700168 rp->max_npartitions = xp_max_npartitions;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700169
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500170 /* establish the actual sizes of the nasid masks */
171 if (rp->SAL_version == 1) {
172 /* SAL_version 1 didn't set the nasids_size field */
Dean Nelson94bd2702008-07-29 22:34:05 -0700173 rp->SAL_nasids_size = 128;
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500174 }
Dean Nelson04de7412008-07-29 22:34:14 -0700175 xpc_nasid_mask_nbytes = rp->SAL_nasids_size;
176 xpc_nasid_mask_nlongs = BITS_TO_LONGS(rp->SAL_nasids_size *
177 BITS_PER_BYTE);
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500178
179 /* setup the pointers to the various items in the reserved page */
180 xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
181 xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
Dean Nelson94bd2702008-07-29 22:34:05 -0700182
Robin Holta7665b02009-04-13 14:40:19 -0700183 ret = xpc_arch_ops.setup_rsvd_page(rp);
Dean Nelson5b8669d2008-07-29 22:34:18 -0700184 if (ret != 0)
185 return ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700186
187 /*
Dean Nelson94bd2702008-07-29 22:34:05 -0700188 * Set timestamp of when reserved page was setup by XPC.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700189 * This signifies to the remote partition that our reserved
190 * page is initialized.
191 */
Dean Nelson81fe7882008-07-29 22:34:15 -0700192 new_ts_jiffies = jiffies;
193 if (new_ts_jiffies == 0 || new_ts_jiffies == rp->ts_jiffies)
194 new_ts_jiffies++;
195 rp->ts_jiffies = new_ts_jiffies;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700196
Dean Nelson5b8669d2008-07-29 22:34:18 -0700197 xpc_rsvd_page = rp;
198 return 0;
199}
200
201void
202xpc_teardown_rsvd_page(void)
203{
204 /* a zero timestamp indicates our rsvd page is not initialized */
205 xpc_rsvd_page->ts_jiffies = 0;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700206}
207
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700208/*
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500209 * Get a copy of a portion of the remote partition's rsvd page.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700210 *
211 * remote_rp points to a buffer that is cacheline aligned for BTE copies and
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500212 * is large enough to contain a copy of their reserved page header and
213 * part_nasids mask.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700214 */
Dean Nelson33ba3c72008-07-29 22:34:07 -0700215enum xp_retval
Dean Nelson04de7412008-07-29 22:34:14 -0700216xpc_get_remote_rp(int nasid, unsigned long *discovered_nasids,
Dean Nelsona812dcc2008-07-29 22:34:16 -0700217 struct xpc_rsvd_page *remote_rp, unsigned long *remote_rp_pa)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700218{
Dean Nelson04de7412008-07-29 22:34:14 -0700219 int l;
Dean Nelson908787d2008-07-29 22:34:05 -0700220 enum xp_retval ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700221
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700222 /* get the reserved page's physical address */
223
Dean Nelson27929022005-10-25 14:11:53 -0500224 *remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500225 if (*remote_rp_pa == 0)
Dean Nelson65c17b82008-05-12 14:02:02 -0700226 return xpNoRsvdPageAddr;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700227
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500228 /* pull over the reserved page header and part_nasids mask */
Dean Nelsona812dcc2008-07-29 22:34:16 -0700229 ret = xp_remote_memcpy(xp_pa(remote_rp), *remote_rp_pa,
Dean Nelson04de7412008-07-29 22:34:14 -0700230 XPC_RP_HEADER_SIZE + xpc_nasid_mask_nbytes);
Dean Nelson908787d2008-07-29 22:34:05 -0700231 if (ret != xpSuccess)
232 return ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700233
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700234 if (discovered_nasids != NULL) {
Dean Nelson04de7412008-07-29 22:34:14 -0700235 unsigned long *remote_part_nasids =
236 XPC_RP_PART_NASIDS(remote_rp);
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500237
Dean Nelson04de7412008-07-29 22:34:14 -0700238 for (l = 0; l < xpc_nasid_mask_nlongs; l++)
239 discovered_nasids[l] |= remote_part_nasids[l];
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700240 }
241
Dean Nelson81fe7882008-07-29 22:34:15 -0700242 /* zero timestamp indicates the reserved page has not been setup */
243 if (remote_rp->ts_jiffies == 0)
Dean Nelson94bd2702008-07-29 22:34:05 -0700244 return xpRsvdPageNotSet;
245
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700246 if (XPC_VERSION_MAJOR(remote_rp->version) !=
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500247 XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
Dean Nelson65c17b82008-05-12 14:02:02 -0700248 return xpBadVersion;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700249 }
250
Dean Nelsona47d5da2008-07-29 22:34:09 -0700251 /* check that both remote and local partids are valid for each side */
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700252 if (remote_rp->SAL_partid < 0 ||
253 remote_rp->SAL_partid >= xp_max_npartitions ||
Dean Nelson261f3b42008-07-29 22:34:16 -0700254 remote_rp->max_npartitions <= xp_partition_id) {
Dean Nelson94bd2702008-07-29 22:34:05 -0700255 return xpInvalidPartid;
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700256 }
257
Dean Nelson261f3b42008-07-29 22:34:16 -0700258 if (remote_rp->SAL_partid == xp_partition_id)
Dean Nelsonaaa3cd62008-07-29 22:34:07 -0700259 return xpLocalPartid;
Dean Nelson94bd2702008-07-29 22:34:05 -0700260
Dean Nelson65c17b82008-05-12 14:02:02 -0700261 return xpSuccess;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700262}
263
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700264/*
Dean Nelsona47d5da2008-07-29 22:34:09 -0700265 * See if the other side has responded to a partition deactivate request
266 * from us. Though we requested the remote partition to deactivate with regard
267 * to us, we really only need to wait for the other side to disengage from us.
Dean Nelsona607c382005-09-01 14:01:37 -0500268 */
269int
270xpc_partition_disengaged(struct xpc_partition *part)
271{
Dean Nelson64d032b2008-05-12 14:02:03 -0700272 short partid = XPC_PARTID(part);
Dean Nelsona607c382005-09-01 14:01:37 -0500273 int disengaged;
274
Robin Holta7665b02009-04-13 14:40:19 -0700275 disengaged = !xpc_arch_ops.partition_engaged(partid);
Dean Nelsona47d5da2008-07-29 22:34:09 -0700276 if (part->disengage_timeout) {
Dean Nelsona607c382005-09-01 14:01:37 -0500277 if (!disengaged) {
Dean Nelsona47d5da2008-07-29 22:34:09 -0700278 if (time_is_after_jiffies(part->disengage_timeout)) {
Dean Nelsona607c382005-09-01 14:01:37 -0500279 /* timelimit hasn't been reached yet */
280 return 0;
281 }
282
283 /*
Dean Nelsona47d5da2008-07-29 22:34:09 -0700284 * Other side hasn't responded to our deactivate
Dean Nelsona607c382005-09-01 14:01:37 -0500285 * request in a timely fashion, so assume it's dead.
286 */
287
Dean Nelsona47d5da2008-07-29 22:34:09 -0700288 dev_info(xpc_part, "deactivate request to remote "
289 "partition %d timed out\n", partid);
290 xpc_disengage_timedout = 1;
Robin Holta7665b02009-04-13 14:40:19 -0700291 xpc_arch_ops.assume_partition_disengaged(partid);
Dean Nelsona607c382005-09-01 14:01:37 -0500292 disengaged = 1;
293 }
Dean Nelsona47d5da2008-07-29 22:34:09 -0700294 part->disengage_timeout = 0;
Dean Nelsona607c382005-09-01 14:01:37 -0500295
296 /* cancel the timer function, provided it's not us */
Dean Nelsona47d5da2008-07-29 22:34:09 -0700297 if (!in_interrupt())
298 del_singleshot_timer_sync(&part->disengage_timer);
Dean Nelsona607c382005-09-01 14:01:37 -0500299
Dean Nelson83469b52008-07-29 22:34:18 -0700300 DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING &&
301 part->act_state != XPC_P_AS_INACTIVE);
302 if (part->act_state != XPC_P_AS_INACTIVE)
Dean Nelsona607c382005-09-01 14:01:37 -0500303 xpc_wakeup_channel_mgr(part);
Dean Nelsona607c382005-09-01 14:01:37 -0500304
Robin Holta7665b02009-04-13 14:40:19 -0700305 xpc_arch_ops.cancel_partition_deactivation_request(part);
Dean Nelsona607c382005-09-01 14:01:37 -0500306 }
307 return disengaged;
308}
309
Dean Nelsona607c382005-09-01 14:01:37 -0500310/*
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700311 * Mark specified partition as active.
312 */
Dean Nelson65c17b82008-05-12 14:02:02 -0700313enum xp_retval
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700314xpc_mark_partition_active(struct xpc_partition *part)
315{
316 unsigned long irq_flags;
Dean Nelson65c17b82008-05-12 14:02:02 -0700317 enum xp_retval ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700318
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700319 dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
320
321 spin_lock_irqsave(&part->act_lock, irq_flags);
Dean Nelson83469b52008-07-29 22:34:18 -0700322 if (part->act_state == XPC_P_AS_ACTIVATING) {
323 part->act_state = XPC_P_AS_ACTIVE;
Dean Nelson65c17b82008-05-12 14:02:02 -0700324 ret = xpSuccess;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700325 } else {
Dean Nelson65c17b82008-05-12 14:02:02 -0700326 DBUG_ON(part->reason == xpSuccess);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700327 ret = part->reason;
328 }
329 spin_unlock_irqrestore(&part->act_lock, irq_flags);
330
331 return ret;
332}
333
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700334/*
Dean Nelsona47d5da2008-07-29 22:34:09 -0700335 * Start the process of deactivating the specified partition.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700336 */
337void
338xpc_deactivate_partition(const int line, struct xpc_partition *part,
Dean Nelson65c17b82008-05-12 14:02:02 -0700339 enum xp_retval reason)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700340{
341 unsigned long irq_flags;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700342
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700343 spin_lock_irqsave(&part->act_lock, irq_flags);
344
Dean Nelson83469b52008-07-29 22:34:18 -0700345 if (part->act_state == XPC_P_AS_INACTIVE) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700346 XPC_SET_REASON(part, reason, line);
347 spin_unlock_irqrestore(&part->act_lock, irq_flags);
Dean Nelson65c17b82008-05-12 14:02:02 -0700348 if (reason == xpReactivating) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700349 /* we interrupt ourselves to reactivate partition */
Robin Holta7665b02009-04-13 14:40:19 -0700350 xpc_arch_ops.request_partition_reactivation(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700351 }
352 return;
353 }
Dean Nelson83469b52008-07-29 22:34:18 -0700354 if (part->act_state == XPC_P_AS_DEACTIVATING) {
Dean Nelson65c17b82008-05-12 14:02:02 -0700355 if ((part->reason == xpUnloading && reason != xpUnloading) ||
356 reason == xpReactivating) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700357 XPC_SET_REASON(part, reason, line);
358 }
359 spin_unlock_irqrestore(&part->act_lock, irq_flags);
360 return;
361 }
362
Dean Nelson83469b52008-07-29 22:34:18 -0700363 part->act_state = XPC_P_AS_DEACTIVATING;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700364 XPC_SET_REASON(part, reason, line);
365
366 spin_unlock_irqrestore(&part->act_lock, irq_flags);
367
Dean Nelsona47d5da2008-07-29 22:34:09 -0700368 /* ask remote partition to deactivate with regard to us */
Robin Holta7665b02009-04-13 14:40:19 -0700369 xpc_arch_ops.request_partition_deactivation(part);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700370
Dean Nelsona47d5da2008-07-29 22:34:09 -0700371 /* set a timelimit on the disengage phase of the deactivation request */
372 part->disengage_timeout = jiffies + (xpc_disengage_timelimit * HZ);
373 part->disengage_timer.expires = part->disengage_timeout;
374 add_timer(&part->disengage_timer);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700375
Dean Nelsone54af722005-10-25 14:07:43 -0500376 dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
377 XPC_PARTID(part), reason);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700378
Dean Nelsona607c382005-09-01 14:01:37 -0500379 xpc_partition_going_down(part, reason);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700380}
381
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700382/*
Dean Nelsona607c382005-09-01 14:01:37 -0500383 * Mark specified partition as inactive.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700384 */
385void
386xpc_mark_partition_inactive(struct xpc_partition *part)
387{
388 unsigned long irq_flags;
389
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700390 dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
391 XPC_PARTID(part));
392
393 spin_lock_irqsave(&part->act_lock, irq_flags);
Dean Nelson83469b52008-07-29 22:34:18 -0700394 part->act_state = XPC_P_AS_INACTIVE;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700395 spin_unlock_irqrestore(&part->act_lock, irq_flags);
396 part->remote_rp_pa = 0;
397}
398
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700399/*
400 * SAL has provided a partition and machine mask. The partition mask
401 * contains a bit for each even nasid in our partition. The machine
402 * mask contains a bit for each even nasid in the entire machine.
403 *
404 * Using those two bit arrays, we can determine which nasids are
405 * known in the machine. Each should also have a reserved page
406 * initialized if they are available for partitioning.
407 */
408void
409xpc_discovery(void)
410{
411 void *remote_rp_base;
412 struct xpc_rsvd_page *remote_rp;
Dean Nelsona812dcc2008-07-29 22:34:16 -0700413 unsigned long remote_rp_pa;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700414 int region;
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500415 int region_size;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700416 int max_regions;
417 int nasid;
418 struct xpc_rsvd_page *rp;
Dean Nelson04de7412008-07-29 22:34:14 -0700419 unsigned long *discovered_nasids;
Dean Nelson65c17b82008-05-12 14:02:02 -0700420 enum xp_retval ret;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700421
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500422 remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
Dean Nelson04de7412008-07-29 22:34:14 -0700423 xpc_nasid_mask_nbytes,
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500424 GFP_KERNEL, &remote_rp_base);
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500425 if (remote_rp == NULL)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700426 return;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500427
Dean Nelson04de7412008-07-29 22:34:14 -0700428 discovered_nasids = kzalloc(sizeof(long) * xpc_nasid_mask_nlongs,
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500429 GFP_KERNEL);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700430 if (discovered_nasids == NULL) {
431 kfree(remote_rp_base);
432 return;
433 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700434
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500435 rp = (struct xpc_rsvd_page *)xpc_rsvd_page;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700436
437 /*
438 * The term 'region' in this context refers to the minimum number of
439 * nodes that can comprise an access protection grouping. The access
440 * protection is in regards to memory, IOI and IPI.
441 */
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500442 max_regions = 64;
Dean Nelson261f3b42008-07-29 22:34:16 -0700443 region_size = xp_region_size;
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500444
445 switch (region_size) {
446 case 128:
447 max_regions *= 2;
448 case 64:
449 max_regions *= 2;
450 case 32:
451 max_regions *= 2;
452 region_size = 16;
453 DBUG_ON(!is_shub2());
454 }
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700455
456 for (region = 0; region < max_regions; region++) {
457
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500458 if (xpc_exiting)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700459 break;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700460
461 dev_dbg(xpc_part, "searching region %d\n", region);
462
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500463 for (nasid = (region * region_size * 2);
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500464 nasid < ((region + 1) * region_size * 2); nasid += 2) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700465
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500466 if (xpc_exiting)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700467 break;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700468
469 dev_dbg(xpc_part, "checking nasid %d\n", nasid);
470
Dean Nelson04de7412008-07-29 22:34:14 -0700471 if (test_bit(nasid / 2, xpc_part_nasids)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700472 dev_dbg(xpc_part, "PROM indicates Nasid %d is "
473 "part of the local partition; skipping "
474 "region\n", nasid);
475 break;
476 }
477
Dean Nelson04de7412008-07-29 22:34:14 -0700478 if (!(test_bit(nasid / 2, xpc_mach_nasids))) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700479 dev_dbg(xpc_part, "PROM indicates Nasid %d was "
480 "not on Numa-Link network at reset\n",
481 nasid);
482 continue;
483 }
484
Dean Nelson04de7412008-07-29 22:34:14 -0700485 if (test_bit(nasid / 2, discovered_nasids)) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700486 dev_dbg(xpc_part, "Nasid %d is part of a "
487 "partition which was previously "
488 "discovered\n", nasid);
489 continue;
490 }
491
Dean Nelson33ba3c72008-07-29 22:34:07 -0700492 /* pull over the rsvd page header & part_nasids mask */
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700493
494 ret = xpc_get_remote_rp(nasid, discovered_nasids,
Dean Nelson4a3ad2d2008-04-22 14:48:01 -0500495 remote_rp, &remote_rp_pa);
Dean Nelson65c17b82008-05-12 14:02:02 -0700496 if (ret != xpSuccess) {
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700497 dev_dbg(xpc_part, "unable to get reserved page "
498 "from nasid %d, reason=%d\n", nasid,
499 ret);
500
Dean Nelson65c17b82008-05-12 14:02:02 -0700501 if (ret == xpLocalPartid)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700502 break;
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500503
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700504 continue;
505 }
506
Robin Holta7665b02009-04-13 14:40:19 -0700507 xpc_arch_ops.request_partition_activation(remote_rp,
Dean Nelsona47d5da2008-07-29 22:34:09 -0700508 remote_rp_pa, nasid);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700509 }
510 }
511
512 kfree(discovered_nasids);
513 kfree(remote_rp_base);
514}
515
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700516/*
517 * Given a partid, get the nasids owned by that partition from the
Dean Nelson3a7d5552005-04-04 13:14:00 -0700518 * remote partition's reserved page.
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700519 */
Dean Nelson65c17b82008-05-12 14:02:02 -0700520enum xp_retval
Dean Nelson64d032b2008-05-12 14:02:03 -0700521xpc_initiate_partid_to_nasids(short partid, void *nasid_mask)
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700522{
523 struct xpc_partition *part;
Dean Nelsona812dcc2008-07-29 22:34:16 -0700524 unsigned long part_nasid_pa;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700525
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700526 part = &xpc_partitions[partid];
Dean Nelson2c2b94f2008-04-22 14:50:17 -0500527 if (part->remote_rp_pa == 0)
Dean Nelson65c17b82008-05-12 14:02:02 -0700528 return xpPartitionDown;
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700529
Dean Nelson04de7412008-07-29 22:34:14 -0700530 memset(nasid_mask, 0, xpc_nasid_mask_nbytes);
Dean Nelson4b38fcd2005-10-25 14:09:51 -0500531
Dean Nelsona812dcc2008-07-29 22:34:16 -0700532 part_nasid_pa = (unsigned long)XPC_RP_PART_NASIDS(part->remote_rp_pa);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700533
Dean Nelsona812dcc2008-07-29 22:34:16 -0700534 return xp_remote_memcpy(xp_pa(nasid_mask), part_nasid_pa,
Dean Nelson04de7412008-07-29 22:34:14 -0700535 xpc_nasid_mask_nbytes);
Dean Nelson89eb8eb2005-03-23 19:50:00 -0700536}