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545 lines
14 KiB
545 lines
14 KiB
/* |
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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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* (C) Copyright 2020 Hewlett Packard Enterprise Development LP |
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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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/* |
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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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|
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#include <linux/device.h> |
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#include <linux/hardirq.h> |
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#include <linux/slab.h> |
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#include "xpc.h" |
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#include <asm/uv/uv_hub.h> |
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|
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/* XPC is exiting flag */ |
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int xpc_exiting; |
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|
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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 unsigned long *xpc_part_nasids; |
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unsigned long *xpc_mach_nasids; |
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static int xpc_nasid_mask_nbytes; /* #of bytes in nasid mask */ |
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int xpc_nasid_mask_nlongs; /* #of longs in nasid mask */ |
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struct xpc_partition *xpc_partitions; |
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|
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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 unsigned long |
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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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u64 cookie = 0; |
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unsigned long rp_pa = nasid; /* seed with nasid */ |
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size_t len = 0; |
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size_t buf_len = 0; |
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void *buf = NULL; |
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void *buf_base = NULL; |
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enum xp_retval (*get_partition_rsvd_page_pa) |
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(void *, u64 *, unsigned long *, size_t *) = |
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xpc_arch_ops.get_partition_rsvd_page_pa; |
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|
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while (1) { |
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/* !!! rp_pa will need to be _gpa on UV. |
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* ??? So do we save it into the architecture specific parts |
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* ??? of the xpc_partition structure? Do we rename this |
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* ??? function or have two versions? Rename rp_pa for UV to |
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* ??? rp_gpa? |
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*/ |
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ret = get_partition_rsvd_page_pa(buf, &cookie, &rp_pa, &len); |
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dev_dbg(xpc_part, "SAL returned with ret=%d, cookie=0x%016lx, " |
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"address=0x%016lx, len=0x%016lx\n", ret, |
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(unsigned long)cookie, rp_pa, len); |
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if (ret != xpNeedMoreInfo) |
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break; |
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if (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 = xpc_kmalloc_cacheline_aligned(buf_len, 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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ret = xpNoMemory; |
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break; |
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} |
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} |
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ret = xp_remote_memcpy(xp_pa(buf), rp_pa, 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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break; |
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} |
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} |
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kfree(buf_base); |
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if (ret != xpSuccess) |
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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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int |
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xpc_setup_rsvd_page(void) |
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{ |
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int ret; |
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struct xpc_rsvd_page *rp; |
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unsigned long rp_pa; |
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unsigned long new_ts_jiffies; |
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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(xp_cpu_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 -ESRCH; |
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} |
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rp = (struct xpc_rsvd_page *)__va(xp_socket_pa(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 != xp_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 -EINVAL; |
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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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xpc_nasid_mask_nbytes = rp->SAL_nasids_size; |
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xpc_nasid_mask_nlongs = BITS_TO_LONGS(rp->SAL_nasids_size * |
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BITS_PER_BYTE); |
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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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ret = xpc_arch_ops.setup_rsvd_page(rp); |
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if (ret != 0) |
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return ret; |
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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_ts_jiffies = jiffies; |
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if (new_ts_jiffies == 0 || new_ts_jiffies == rp->ts_jiffies) |
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new_ts_jiffies++; |
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rp->ts_jiffies = new_ts_jiffies; |
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xpc_rsvd_page = rp; |
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return 0; |
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} |
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void |
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xpc_teardown_rsvd_page(void) |
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{ |
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/* a zero timestamp indicates our rsvd page is not initialized */ |
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xpc_rsvd_page->ts_jiffies = 0; |
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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, unsigned long *discovered_nasids, |
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struct xpc_rsvd_page *remote_rp, unsigned long *remote_rp_pa) |
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{ |
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int l; |
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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(xp_pa(remote_rp), *remote_rp_pa, |
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XPC_RP_HEADER_SIZE + xpc_nasid_mask_nbytes); |
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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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unsigned long *remote_part_nasids = |
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XPC_RP_PART_NASIDS(remote_rp); |
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for (l = 0; l < xpc_nasid_mask_nlongs; l++) |
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discovered_nasids[l] |= remote_part_nasids[l]; |
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} |
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/* zero timestamp indicates the reserved page has not been setup */ |
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if (remote_rp->ts_jiffies == 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 remote and local 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 <= xp_partition_id) { |
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return xpInvalidPartid; |
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} |
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if (remote_rp->SAL_partid == xp_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 deactivate request |
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* from us. Though we requested the remote partition to deactivate with regard |
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* to us, we really only need to wait for the other side to disengage from us. |
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*/ |
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static int __xpc_partition_disengaged(struct xpc_partition *part, |
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bool from_timer) |
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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_arch_ops.partition_engaged(partid); |
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if (part->disengage_timeout) { |
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if (!disengaged) { |
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if (time_is_after_jiffies(part->disengage_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 deactivate |
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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, "deactivate request to remote " |
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"partition %d timed out\n", partid); |
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xpc_disengage_timedout = 1; |
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xpc_arch_ops.assume_partition_disengaged(partid); |
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disengaged = 1; |
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} |
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part->disengage_timeout = 0; |
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/* Cancel the timer function if not called from it */ |
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if (!from_timer) |
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del_timer_sync(&part->disengage_timer); |
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DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING && |
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part->act_state != XPC_P_AS_INACTIVE); |
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if (part->act_state != XPC_P_AS_INACTIVE) |
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xpc_wakeup_channel_mgr(part); |
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xpc_arch_ops.cancel_partition_deactivation_request(part); |
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} |
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return disengaged; |
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} |
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int xpc_partition_disengaged(struct xpc_partition *part) |
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{ |
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return __xpc_partition_disengaged(part, false); |
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} |
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int xpc_partition_disengaged_from_timer(struct xpc_partition *part) |
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{ |
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return __xpc_partition_disengaged(part, true); |
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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_AS_ACTIVATING) { |
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part->act_state = XPC_P_AS_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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* Start the process of deactivating the specified partition. |
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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_AS_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_arch_ops.request_partition_reactivation(part); |
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} |
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return; |
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} |
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if (part->act_state == XPC_P_AS_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_AS_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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/* ask remote partition to deactivate with regard to us */ |
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xpc_arch_ops.request_partition_deactivation(part); |
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/* set a timelimit on the disengage phase of the deactivation request */ |
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part->disengage_timeout = jiffies + (xpc_disengage_timelimit * HZ); |
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part->disengage_timer.expires = part->disengage_timeout; |
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add_timer(&part->disengage_timer); |
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dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n", |
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XPC_PARTID(part), reason); |
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xpc_partition_going_down(part, reason); |
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} |
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/* |
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* Mark specified partition as inactive. |
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*/ |
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void |
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xpc_mark_partition_inactive(struct xpc_partition *part) |
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{ |
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unsigned long irq_flags; |
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dev_dbg(xpc_part, "setting partition %d to INACTIVE\n", |
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XPC_PARTID(part)); |
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spin_lock_irqsave(&part->act_lock, irq_flags); |
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part->act_state = XPC_P_AS_INACTIVE; |
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spin_unlock_irqrestore(&part->act_lock, irq_flags); |
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part->remote_rp_pa = 0; |
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} |
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/* |
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* SAL has provided a partition and machine mask. The partition mask |
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* contains a bit for each even nasid in our partition. The machine |
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* mask contains a bit for each even nasid in the entire machine. |
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* |
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* Using those two bit arrays, we can determine which nasids are |
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* known in the machine. Each should also have a reserved page |
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* initialized if they are available for partitioning. |
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*/ |
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void |
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xpc_discovery(void) |
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{ |
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void *remote_rp_base; |
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struct xpc_rsvd_page *remote_rp; |
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unsigned long remote_rp_pa; |
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int region; |
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int region_size; |
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int max_regions; |
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int nasid; |
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unsigned long *discovered_nasids; |
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enum xp_retval ret; |
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remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE + |
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xpc_nasid_mask_nbytes, |
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GFP_KERNEL, &remote_rp_base); |
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if (remote_rp == NULL) |
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return; |
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discovered_nasids = kcalloc(xpc_nasid_mask_nlongs, sizeof(long), |
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GFP_KERNEL); |
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if (discovered_nasids == NULL) { |
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kfree(remote_rp_base); |
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return; |
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} |
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/* |
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* The term 'region' in this context refers to the minimum number of |
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* nodes that can comprise an access protection grouping. The access |
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* protection is in regards to memory, IOI and IPI. |
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*/ |
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region_size = xp_region_size; |
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if (is_uv_system()) |
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max_regions = 256; |
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else { |
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max_regions = 64; |
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switch (region_size) { |
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case 128: |
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max_regions *= 2; |
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fallthrough; |
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case 64: |
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max_regions *= 2; |
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fallthrough; |
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case 32: |
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max_regions *= 2; |
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region_size = 16; |
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} |
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} |
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for (region = 0; region < max_regions; region++) { |
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|
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if (xpc_exiting) |
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break; |
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dev_dbg(xpc_part, "searching region %d\n", region); |
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for (nasid = (region * region_size * 2); |
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nasid < ((region + 1) * region_size * 2); nasid += 2) { |
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if (xpc_exiting) |
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break; |
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dev_dbg(xpc_part, "checking nasid %d\n", nasid); |
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if (test_bit(nasid / 2, xpc_part_nasids)) { |
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dev_dbg(xpc_part, "PROM indicates Nasid %d is " |
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"part of the local partition; skipping " |
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"region\n", nasid); |
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break; |
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} |
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if (!(test_bit(nasid / 2, xpc_mach_nasids))) { |
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dev_dbg(xpc_part, "PROM indicates Nasid %d was " |
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"not on Numa-Link network at reset\n", |
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nasid); |
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continue; |
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} |
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if (test_bit(nasid / 2, discovered_nasids)) { |
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dev_dbg(xpc_part, "Nasid %d is part of a " |
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"partition which was previously " |
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"discovered\n", nasid); |
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continue; |
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} |
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/* pull over the rsvd page header & part_nasids mask */ |
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ret = xpc_get_remote_rp(nasid, discovered_nasids, |
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remote_rp, &remote_rp_pa); |
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if (ret != xpSuccess) { |
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dev_dbg(xpc_part, "unable to get reserved page " |
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"from nasid %d, reason=%d\n", nasid, |
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ret); |
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|
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if (ret == xpLocalPartid) |
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break; |
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|
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continue; |
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} |
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xpc_arch_ops.request_partition_activation(remote_rp, |
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remote_rp_pa, nasid); |
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} |
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} |
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kfree(discovered_nasids); |
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kfree(remote_rp_base); |
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} |
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|
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/* |
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* Given a partid, get the nasids owned by that partition from the |
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* remote partition's reserved page. |
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*/ |
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enum xp_retval |
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xpc_initiate_partid_to_nasids(short partid, void *nasid_mask) |
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{ |
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struct xpc_partition *part; |
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unsigned long part_nasid_pa; |
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|
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part = &xpc_partitions[partid]; |
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if (part->remote_rp_pa == 0) |
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return xpPartitionDown; |
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memset(nasid_mask, 0, xpc_nasid_mask_nbytes); |
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part_nasid_pa = (unsigned long)XPC_RP_PART_NASIDS(part->remote_rp_pa); |
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return xp_remote_memcpy(xp_pa(nasid_mask), part_nasid_pa, |
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xpc_nasid_mask_nbytes); |
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}
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