659 lines
16 KiB
C
659 lines
16 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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* Cross Partition Communication (XPC) partition support.
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*
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* This is the part of XPC that detects the presence/absence of
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* other partitions. It provides a heartbeat and monitors the
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* heartbeats of other partitions.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/sysctl.h>
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#include <linux/cache.h>
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#include <linux/mmzone.h>
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#include <linux/nodemask.h>
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#include <asm/sn/intr.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/sn/nodepda.h>
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#include <asm/sn/addrs.h>
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#include "xpc.h"
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/* XPC is exiting flag */
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int xpc_exiting;
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/* SH_IPI_ACCESS shub register value on startup */
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static u64 xpc_sh1_IPI_access;
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static u64 xpc_sh2_IPI_access0;
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static u64 xpc_sh2_IPI_access1;
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static u64 xpc_sh2_IPI_access2;
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static u64 xpc_sh2_IPI_access3;
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/* original protection values for each node */
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u64 xpc_prot_vec[MAX_NUMNODES];
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/* this partition's reserved page pointers */
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struct xpc_rsvd_page *xpc_rsvd_page;
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static u64 *xpc_part_nasids;
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u64 *xpc_mach_nasids;
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/* >>> next two variables should be 'xpc_' if they remain here */
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static int xp_sizeof_nasid_mask; /* actual size in bytes of nasid mask */
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int xp_nasid_mask_words; /* actual size in words of nasid mask */
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struct xpc_partition *xpc_partitions;
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/*
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* Generic buffer used to store a local copy of portions of a remote
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* partition's reserved page (either its header and part_nasids mask,
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* or its vars).
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*/
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char *xpc_remote_copy_buffer;
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void *xpc_remote_copy_buffer_base;
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/*
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* Guarantee that the kmalloc'd memory is cacheline aligned.
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*/
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void *
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xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
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{
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/* see if kmalloc will give us cachline aligned memory by default */
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*base = kmalloc(size, flags);
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if (*base == NULL)
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return NULL;
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if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
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return *base;
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kfree(*base);
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/* nope, we'll have to do it ourselves */
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*base = kmalloc(size + L1_CACHE_BYTES, flags);
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if (*base == NULL)
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return NULL;
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return (void *)L1_CACHE_ALIGN((u64)*base);
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}
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/*
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* Given a nasid, get the physical address of the partition's reserved page
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* for that nasid. This function returns 0 on any error.
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*/
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static u64
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xpc_get_rsvd_page_pa(int nasid)
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{
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enum xp_retval ret;
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s64 status;
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u64 cookie = 0;
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u64 rp_pa = nasid; /* seed with nasid */
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u64 len = 0;
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u64 buf = buf;
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u64 buf_len = 0;
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void *buf_base = NULL;
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while (1) {
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status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
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&len);
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dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
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"0x%016lx, address=0x%016lx, len=0x%016lx\n",
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status, cookie, rp_pa, len);
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if (status != SALRET_MORE_PASSES)
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break;
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/* >>> L1_CACHE_ALIGN() is only a sn2-bte_copy requirement */
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if (L1_CACHE_ALIGN(len) > buf_len) {
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kfree(buf_base);
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buf_len = L1_CACHE_ALIGN(len);
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buf = (u64)xpc_kmalloc_cacheline_aligned(buf_len,
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GFP_KERNEL,
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&buf_base);
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if (buf_base == NULL) {
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dev_err(xpc_part, "unable to kmalloc "
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"len=0x%016lx\n", buf_len);
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status = SALRET_ERROR;
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break;
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}
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}
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ret = xp_remote_memcpy((void *)buf, (void *)rp_pa, buf_len);
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if (ret != xpSuccess) {
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dev_dbg(xpc_part, "xp_remote_memcpy failed %d\n", ret);
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status = SALRET_ERROR;
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break;
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}
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}
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kfree(buf_base);
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if (status != SALRET_OK)
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rp_pa = 0;
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dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
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return rp_pa;
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}
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/*
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* Fill the partition reserved page with the information needed by
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* other partitions to discover we are alive and establish initial
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* communications.
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*/
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struct xpc_rsvd_page *
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xpc_setup_rsvd_page(void)
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{
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struct xpc_rsvd_page *rp;
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u64 rp_pa;
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unsigned long new_stamp;
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/* get the local reserved page's address */
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preempt_disable();
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rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
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preempt_enable();
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if (rp_pa == 0) {
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dev_err(xpc_part, "SAL failed to locate the reserved page\n");
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return NULL;
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}
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rp = (struct xpc_rsvd_page *)__va(rp_pa);
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if (rp->SAL_version < 3) {
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/* SAL_versions < 3 had a SAL_partid defined as a u8 */
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rp->SAL_partid &= 0xff;
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}
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BUG_ON(rp->SAL_partid != sn_partition_id);
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if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) {
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dev_err(xpc_part, "the reserved page's partid of %d is outside "
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"supported range (< 0 || >= %d)\n", rp->SAL_partid,
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xp_max_npartitions);
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return NULL;
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}
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rp->version = XPC_RP_VERSION;
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rp->max_npartitions = xp_max_npartitions;
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/* establish the actual sizes of the nasid masks */
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if (rp->SAL_version == 1) {
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/* SAL_version 1 didn't set the nasids_size field */
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rp->SAL_nasids_size = 128;
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}
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xp_sizeof_nasid_mask = rp->SAL_nasids_size;
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xp_nasid_mask_words = DIV_ROUND_UP(xp_sizeof_nasid_mask,
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BYTES_PER_WORD);
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/* setup the pointers to the various items in the reserved page */
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xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
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xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
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if (xpc_rsvd_page_init(rp) != xpSuccess)
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return NULL;
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/*
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* Set timestamp of when reserved page was setup by XPC.
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* This signifies to the remote partition that our reserved
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* page is initialized.
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*/
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new_stamp = jiffies;
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if (new_stamp == 0 || new_stamp == rp->stamp)
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new_stamp++;
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rp->stamp = new_stamp;
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return rp;
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}
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/*
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* Change protections to allow IPI operations (and AMO operations on
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* Shub 1.1 systems).
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*/
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void
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xpc_allow_IPI_ops(void)
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{
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int node;
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int nasid;
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/* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */
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if (is_shub2()) {
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xpc_sh2_IPI_access0 =
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(u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
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xpc_sh2_IPI_access1 =
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(u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
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xpc_sh2_IPI_access2 =
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(u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
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xpc_sh2_IPI_access3 =
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(u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
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for_each_online_node(node) {
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nasid = cnodeid_to_nasid(node);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
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-1UL);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
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-1UL);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
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-1UL);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
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-1UL);
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}
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} else {
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xpc_sh1_IPI_access =
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(u64)HUB_L((u64 *)LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
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for_each_online_node(node) {
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nasid = cnodeid_to_nasid(node);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
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-1UL);
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/*
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* Since the BIST collides with memory operations on
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* SHUB 1.1 sn_change_memprotect() cannot be used.
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*/
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if (enable_shub_wars_1_1()) {
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/* open up everything */
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xpc_prot_vec[node] = (u64)HUB_L((u64 *)
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GLOBAL_MMR_ADDR
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(nasid,
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SH1_MD_DQLP_MMR_DIR_PRIVEC0));
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HUB_S((u64 *)
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GLOBAL_MMR_ADDR(nasid,
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SH1_MD_DQLP_MMR_DIR_PRIVEC0),
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-1UL);
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HUB_S((u64 *)
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GLOBAL_MMR_ADDR(nasid,
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SH1_MD_DQRP_MMR_DIR_PRIVEC0),
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-1UL);
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}
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}
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}
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}
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/*
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* Restrict protections to disallow IPI operations (and AMO operations on
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* Shub 1.1 systems).
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*/
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void
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xpc_restrict_IPI_ops(void)
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{
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int node;
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int nasid;
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/* >>> Change SH_IPI_ACCESS code to use SAL call once it is available */
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if (is_shub2()) {
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for_each_online_node(node) {
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nasid = cnodeid_to_nasid(node);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
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xpc_sh2_IPI_access0);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
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xpc_sh2_IPI_access1);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
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xpc_sh2_IPI_access2);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
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xpc_sh2_IPI_access3);
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}
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} else {
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for_each_online_node(node) {
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nasid = cnodeid_to_nasid(node);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
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xpc_sh1_IPI_access);
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if (enable_shub_wars_1_1()) {
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
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SH1_MD_DQLP_MMR_DIR_PRIVEC0),
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xpc_prot_vec[node]);
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HUB_S((u64 *)GLOBAL_MMR_ADDR(nasid,
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SH1_MD_DQRP_MMR_DIR_PRIVEC0),
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xpc_prot_vec[node]);
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}
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}
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}
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}
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/*
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* Get a copy of a portion of the remote partition's rsvd page.
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*
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* remote_rp points to a buffer that is cacheline aligned for BTE copies and
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* is large enough to contain a copy of their reserved page header and
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* part_nasids mask.
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*/
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enum xp_retval
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xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
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struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
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{
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int i;
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enum xp_retval ret;
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/* get the reserved page's physical address */
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*remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
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if (*remote_rp_pa == 0)
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return xpNoRsvdPageAddr;
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/* pull over the reserved page header and part_nasids mask */
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ret = xp_remote_memcpy(remote_rp, (void *)*remote_rp_pa,
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XPC_RP_HEADER_SIZE + xp_sizeof_nasid_mask);
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if (ret != xpSuccess)
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return ret;
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if (discovered_nasids != NULL) {
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u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
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for (i = 0; i < xp_nasid_mask_words; i++)
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discovered_nasids[i] |= remote_part_nasids[i];
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}
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/* see if the reserved page has been set up by XPC */
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if (remote_rp->stamp == 0)
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return xpRsvdPageNotSet;
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if (XPC_VERSION_MAJOR(remote_rp->version) !=
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XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
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return xpBadVersion;
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}
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/* check that both local and remote partids are valid for each side */
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if (remote_rp->SAL_partid < 0 ||
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remote_rp->SAL_partid >= xp_max_npartitions ||
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remote_rp->max_npartitions <= sn_partition_id) {
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return xpInvalidPartid;
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}
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if (remote_rp->SAL_partid == sn_partition_id)
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return xpLocalPartid;
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return xpSuccess;
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}
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/*
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* See if the other side has responded to a partition disengage request
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* from us.
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*/
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int
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xpc_partition_disengaged(struct xpc_partition *part)
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{
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short partid = XPC_PARTID(part);
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int disengaged;
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disengaged = (xpc_partition_engaged(1UL << partid) == 0);
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if (part->disengage_request_timeout) {
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if (!disengaged) {
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if (time_is_after_jiffies(part->
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disengage_request_timeout)) {
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/* timelimit hasn't been reached yet */
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return 0;
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}
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/*
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* Other side hasn't responded to our disengage
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* request in a timely fashion, so assume it's dead.
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*/
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dev_info(xpc_part, "disengage from remote partition %d "
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"timed out\n", partid);
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xpc_disengage_request_timedout = 1;
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xpc_clear_partition_engaged(1UL << partid);
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disengaged = 1;
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}
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part->disengage_request_timeout = 0;
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/* cancel the timer function, provided it's not us */
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if (!in_interrupt()) {
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del_singleshot_timer_sync(&part->
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disengage_request_timer);
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}
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DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
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part->act_state != XPC_P_INACTIVE);
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if (part->act_state != XPC_P_INACTIVE)
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xpc_wakeup_channel_mgr(part);
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if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version))
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xpc_cancel_partition_disengage_request(part);
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}
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return disengaged;
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}
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/*
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* Mark specified partition as active.
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*/
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enum xp_retval
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xpc_mark_partition_active(struct xpc_partition *part)
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{
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unsigned long irq_flags;
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enum xp_retval ret;
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dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
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spin_lock_irqsave(&part->act_lock, irq_flags);
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if (part->act_state == XPC_P_ACTIVATING) {
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part->act_state = XPC_P_ACTIVE;
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ret = xpSuccess;
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} else {
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DBUG_ON(part->reason == xpSuccess);
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ret = part->reason;
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}
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spin_unlock_irqrestore(&part->act_lock, irq_flags);
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return ret;
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}
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/*
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* Notify XPC that the partition is down.
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*/
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void
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xpc_deactivate_partition(const int line, struct xpc_partition *part,
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enum xp_retval reason)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&part->act_lock, irq_flags);
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if (part->act_state == XPC_P_INACTIVE) {
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XPC_SET_REASON(part, reason, line);
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spin_unlock_irqrestore(&part->act_lock, irq_flags);
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if (reason == xpReactivating) {
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/* we interrupt ourselves to reactivate partition */
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xpc_IPI_send_local_reactivate(part->reactivate_nasid);
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}
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return;
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}
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if (part->act_state == XPC_P_DEACTIVATING) {
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if ((part->reason == xpUnloading && reason != xpUnloading) ||
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reason == xpReactivating) {
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XPC_SET_REASON(part, reason, line);
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}
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spin_unlock_irqrestore(&part->act_lock, irq_flags);
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return;
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}
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part->act_state = XPC_P_DEACTIVATING;
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XPC_SET_REASON(part, reason, line);
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spin_unlock_irqrestore(&part->act_lock, irq_flags);
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if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
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xpc_request_partition_disengage(part);
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xpc_IPI_send_disengage(part);
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/* set a timelimit on the disengage request */
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part->disengage_request_timeout = jiffies +
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(xpc_disengage_request_timelimit * HZ);
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part->disengage_request_timer.expires =
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part->disengage_request_timeout;
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add_timer(&part->disengage_request_timer);
|
|
}
|
|
|
|
dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
|
|
XPC_PARTID(part), reason);
|
|
|
|
xpc_partition_going_down(part, reason);
|
|
}
|
|
|
|
/*
|
|
* Mark specified partition as inactive.
|
|
*/
|
|
void
|
|
xpc_mark_partition_inactive(struct xpc_partition *part)
|
|
{
|
|
unsigned long irq_flags;
|
|
|
|
dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
|
|
XPC_PARTID(part));
|
|
|
|
spin_lock_irqsave(&part->act_lock, irq_flags);
|
|
part->act_state = XPC_P_INACTIVE;
|
|
spin_unlock_irqrestore(&part->act_lock, irq_flags);
|
|
part->remote_rp_pa = 0;
|
|
}
|
|
|
|
/*
|
|
* SAL has provided a partition and machine mask. The partition mask
|
|
* contains a bit for each even nasid in our partition. The machine
|
|
* mask contains a bit for each even nasid in the entire machine.
|
|
*
|
|
* Using those two bit arrays, we can determine which nasids are
|
|
* known in the machine. Each should also have a reserved page
|
|
* initialized if they are available for partitioning.
|
|
*/
|
|
void
|
|
xpc_discovery(void)
|
|
{
|
|
void *remote_rp_base;
|
|
struct xpc_rsvd_page *remote_rp;
|
|
u64 remote_rp_pa;
|
|
int region;
|
|
int region_size;
|
|
int max_regions;
|
|
int nasid;
|
|
struct xpc_rsvd_page *rp;
|
|
u64 *discovered_nasids;
|
|
enum xp_retval ret;
|
|
|
|
remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
|
|
xp_sizeof_nasid_mask,
|
|
GFP_KERNEL, &remote_rp_base);
|
|
if (remote_rp == NULL)
|
|
return;
|
|
|
|
discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
|
|
GFP_KERNEL);
|
|
if (discovered_nasids == NULL) {
|
|
kfree(remote_rp_base);
|
|
return;
|
|
}
|
|
|
|
rp = (struct xpc_rsvd_page *)xpc_rsvd_page;
|
|
|
|
/*
|
|
* The term 'region' in this context refers to the minimum number of
|
|
* nodes that can comprise an access protection grouping. The access
|
|
* protection is in regards to memory, IOI and IPI.
|
|
*/
|
|
max_regions = 64;
|
|
region_size = sn_region_size;
|
|
|
|
switch (region_size) {
|
|
case 128:
|
|
max_regions *= 2;
|
|
case 64:
|
|
max_regions *= 2;
|
|
case 32:
|
|
max_regions *= 2;
|
|
region_size = 16;
|
|
DBUG_ON(!is_shub2());
|
|
}
|
|
|
|
for (region = 0; region < max_regions; region++) {
|
|
|
|
if (xpc_exiting)
|
|
break;
|
|
|
|
dev_dbg(xpc_part, "searching region %d\n", region);
|
|
|
|
for (nasid = (region * region_size * 2);
|
|
nasid < ((region + 1) * region_size * 2); nasid += 2) {
|
|
|
|
if (xpc_exiting)
|
|
break;
|
|
|
|
dev_dbg(xpc_part, "checking nasid %d\n", nasid);
|
|
|
|
if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
|
|
dev_dbg(xpc_part, "PROM indicates Nasid %d is "
|
|
"part of the local partition; skipping "
|
|
"region\n", nasid);
|
|
break;
|
|
}
|
|
|
|
if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
|
|
dev_dbg(xpc_part, "PROM indicates Nasid %d was "
|
|
"not on Numa-Link network at reset\n",
|
|
nasid);
|
|
continue;
|
|
}
|
|
|
|
if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
|
|
dev_dbg(xpc_part, "Nasid %d is part of a "
|
|
"partition which was previously "
|
|
"discovered\n", nasid);
|
|
continue;
|
|
}
|
|
|
|
/* pull over the rsvd page header & part_nasids mask */
|
|
|
|
ret = xpc_get_remote_rp(nasid, discovered_nasids,
|
|
remote_rp, &remote_rp_pa);
|
|
if (ret != xpSuccess) {
|
|
dev_dbg(xpc_part, "unable to get reserved page "
|
|
"from nasid %d, reason=%d\n", nasid,
|
|
ret);
|
|
|
|
if (ret == xpLocalPartid)
|
|
break;
|
|
|
|
continue;
|
|
}
|
|
|
|
xpc_initiate_partition_activation(remote_rp,
|
|
remote_rp_pa, nasid);
|
|
}
|
|
}
|
|
|
|
kfree(discovered_nasids);
|
|
kfree(remote_rp_base);
|
|
}
|
|
|
|
/*
|
|
* Given a partid, get the nasids owned by that partition from the
|
|
* remote partition's reserved page.
|
|
*/
|
|
enum xp_retval
|
|
xpc_initiate_partid_to_nasids(short partid, void *nasid_mask)
|
|
{
|
|
struct xpc_partition *part;
|
|
u64 part_nasid_pa;
|
|
|
|
part = &xpc_partitions[partid];
|
|
if (part->remote_rp_pa == 0)
|
|
return xpPartitionDown;
|
|
|
|
memset(nasid_mask, 0, XP_NASID_MASK_BYTES);
|
|
|
|
part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa);
|
|
|
|
return xp_remote_memcpy(nasid_mask, (void *)part_nasid_pa,
|
|
xp_sizeof_nasid_mask);
|
|
}
|