7682a4c624
Jack Steiner identified a problem where XPC can cause a silent data corruption. On module load, the placement may cause the xpc_remote_copy_buffer to span two physical pages. DMA transfers are done to the start virtual address translated to physical. This patch changes the buffer from a statically allocated buffer to a kmalloc'd buffer. Dean Nelson reviewed this before posting. I have tested it in the configuration that was showing the memory corruption and verified it works. I also added a BUG_ON statement to help catch this if a similar situation is encountered. Signed-off-by: Robin Holt <holt@sgi.com> Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
462 lines
18 KiB
C
462 lines
18 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) 2004-2005 Silicon Graphics, Inc. All rights reserved.
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*/
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/*
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* External Cross Partition (XP) structures and defines.
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*/
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#ifndef _ASM_IA64_SN_XP_H
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#define _ASM_IA64_SN_XP_H
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#include <linux/cache.h>
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#include <linux/hardirq.h>
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#include <linux/mutex.h>
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#include <asm/sn/types.h>
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#include <asm/sn/bte.h>
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#ifdef USE_DBUG_ON
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#define DBUG_ON(condition) BUG_ON(condition)
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#else
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#define DBUG_ON(condition)
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#endif
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/*
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* Define the maximum number of logically defined partitions the system
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* can support. It is constrained by the maximum number of hardware
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* partitionable regions. The term 'region' in this context refers to the
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* minimum number of nodes that can comprise an access protection grouping.
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* The access protection is in regards to memory, IPI and IOI.
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*
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* The maximum number of hardware partitionable regions is equal to the
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* maximum number of nodes in the entire system divided by the minimum number
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* of nodes that comprise an access protection grouping.
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*/
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#define XP_MAX_PARTITIONS 64
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/*
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* Define the number of u64s required to represent all the C-brick nasids
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* as a bitmap. The cross-partition kernel modules deal only with
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* C-brick nasids, thus the need for bitmaps which don't account for
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* odd-numbered (non C-brick) nasids.
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*/
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#define XP_MAX_PHYSNODE_ID (MAX_NUMALINK_NODES / 2)
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#define XP_NASID_MASK_BYTES ((XP_MAX_PHYSNODE_ID + 7) / 8)
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#define XP_NASID_MASK_WORDS ((XP_MAX_PHYSNODE_ID + 63) / 64)
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/*
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* Wrapper for bte_copy() that should it return a failure status will retry
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* the bte_copy() once in the hope that the failure was due to a temporary
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* aberration (i.e., the link going down temporarily).
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*
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* src - physical address of the source of the transfer.
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* vdst - virtual address of the destination of the transfer.
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* len - number of bytes to transfer from source to destination.
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* mode - see bte_copy() for definition.
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* notification - see bte_copy() for definition.
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*
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* Note: xp_bte_copy() should never be called while holding a spinlock.
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*/
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static inline bte_result_t
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xp_bte_copy(u64 src, u64 vdst, u64 len, u64 mode, void *notification)
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{
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bte_result_t ret;
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u64 pdst = ia64_tpa(vdst);
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/*
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* Ensure that the physically mapped memory is contiguous.
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*
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* We do this by ensuring that the memory is from region 7 only.
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* If the need should arise to use memory from one of the other
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* regions, then modify the BUG_ON() statement to ensure that the
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* memory from that region is always physically contiguous.
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*/
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BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
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ret = bte_copy(src, pdst, len, mode, notification);
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if (ret != BTE_SUCCESS) {
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if (!in_interrupt()) {
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cond_resched();
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}
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ret = bte_copy(src, pdst, len, mode, notification);
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}
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return ret;
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}
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/*
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* XPC establishes channel connections between the local partition and any
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* other partition that is currently up. Over these channels, kernel-level
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* `users' can communicate with their counterparts on the other partitions.
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*
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* The maxinum number of channels is limited to eight. For performance reasons,
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* the internal cross partition structures require sixteen bytes per channel,
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* and eight allows all of this interface-shared info to fit in one cache line.
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*
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* XPC_NCHANNELS reflects the total number of channels currently defined.
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* If the need for additional channels arises, one can simply increase
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* XPC_NCHANNELS accordingly. If the day should come where that number
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* exceeds the MAXIMUM number of channels allowed (eight), then one will need
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* to make changes to the XPC code to allow for this.
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*/
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#define XPC_MEM_CHANNEL 0 /* memory channel number */
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#define XPC_NET_CHANNEL 1 /* network channel number */
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#define XPC_NCHANNELS 2 /* #of defined channels */
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#define XPC_MAX_NCHANNELS 8 /* max #of channels allowed */
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#if XPC_NCHANNELS > XPC_MAX_NCHANNELS
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#error XPC_NCHANNELS exceeds MAXIMUM allowed.
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#endif
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/*
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* The format of an XPC message is as follows:
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*
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* +-------+--------------------------------+
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* | flags |////////////////////////////////|
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* +-------+--------------------------------+
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* | message # |
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* +----------------------------------------+
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* | payload (user-defined message) |
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* | |
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* :
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* | |
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* +----------------------------------------+
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*
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* The size of the payload is defined by the user via xpc_connect(). A user-
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* defined message resides in the payload area.
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*
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* The user should have no dealings with the message header, but only the
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* message's payload. When a message entry is allocated (via xpc_allocate())
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* a pointer to the payload area is returned and not the actual beginning of
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* the XPC message. The user then constructs a message in the payload area
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* and passes that pointer as an argument on xpc_send() or xpc_send_notify().
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*
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* The size of a message entry (within a message queue) must be a cacheline
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* sized multiple in order to facilitate the BTE transfer of messages from one
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* message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user
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* that wants to fit as many msg entries as possible in a given memory size
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* (e.g. a memory page).
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*/
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struct xpc_msg {
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u8 flags; /* FOR XPC INTERNAL USE ONLY */
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u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */
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s64 number; /* FOR XPC INTERNAL USE ONLY */
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u64 payload; /* user defined portion of message */
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};
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#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload)
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#define XPC_MSG_SIZE(_payload_size) \
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L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size))
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/*
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* Define the return values and values passed to user's callout functions.
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* (It is important to add new value codes at the end just preceding
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* xpcUnknownReason, which must have the highest numerical value.)
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*/
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enum xpc_retval {
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xpcSuccess = 0,
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xpcNotConnected, /* 1: channel is not connected */
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xpcConnected, /* 2: channel connected (opened) */
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xpcRETIRED1, /* 3: (formerly xpcDisconnected) */
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xpcMsgReceived, /* 4: message received */
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xpcMsgDelivered, /* 5: message delivered and acknowledged */
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xpcRETIRED2, /* 6: (formerly xpcTransferFailed) */
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xpcNoWait, /* 7: operation would require wait */
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xpcRetry, /* 8: retry operation */
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xpcTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
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xpcInterrupted, /* 10: interrupted wait */
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xpcUnequalMsgSizes, /* 11: message size disparity between sides */
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xpcInvalidAddress, /* 12: invalid address */
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xpcNoMemory, /* 13: no memory available for XPC structures */
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xpcLackOfResources, /* 14: insufficient resources for operation */
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xpcUnregistered, /* 15: channel is not registered */
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xpcAlreadyRegistered, /* 16: channel is already registered */
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xpcPartitionDown, /* 17: remote partition is down */
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xpcNotLoaded, /* 18: XPC module is not loaded */
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xpcUnloading, /* 19: this side is unloading XPC module */
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xpcBadMagic, /* 20: XPC MAGIC string not found */
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xpcReactivating, /* 21: remote partition was reactivated */
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xpcUnregistering, /* 22: this side is unregistering channel */
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xpcOtherUnregistering, /* 23: other side is unregistering channel */
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xpcCloneKThread, /* 24: cloning kernel thread */
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xpcCloneKThreadFailed, /* 25: cloning kernel thread failed */
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xpcNoHeartbeat, /* 26: remote partition has no heartbeat */
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xpcPioReadError, /* 27: PIO read error */
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xpcPhysAddrRegFailed, /* 28: registration of phys addr range failed */
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xpcBteDirectoryError, /* 29: maps to BTEFAIL_DIR */
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xpcBtePoisonError, /* 30: maps to BTEFAIL_POISON */
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xpcBteWriteError, /* 31: maps to BTEFAIL_WERR */
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xpcBteAccessError, /* 32: maps to BTEFAIL_ACCESS */
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xpcBtePWriteError, /* 33: maps to BTEFAIL_PWERR */
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xpcBtePReadError, /* 34: maps to BTEFAIL_PRERR */
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xpcBteTimeOutError, /* 35: maps to BTEFAIL_TOUT */
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xpcBteXtalkError, /* 36: maps to BTEFAIL_XTERR */
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xpcBteNotAvailable, /* 37: maps to BTEFAIL_NOTAVAIL */
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xpcBteUnmappedError, /* 38: unmapped BTEFAIL_ error */
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xpcBadVersion, /* 39: bad version number */
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xpcVarsNotSet, /* 40: the XPC variables are not set up */
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xpcNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
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xpcInvalidPartid, /* 42: invalid partition ID */
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xpcLocalPartid, /* 43: local partition ID */
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xpcOtherGoingDown, /* 44: other side going down, reason unknown */
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xpcSystemGoingDown, /* 45: system is going down, reason unknown */
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xpcSystemHalt, /* 46: system is being halted */
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xpcSystemReboot, /* 47: system is being rebooted */
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xpcSystemPoweroff, /* 48: system is being powered off */
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xpcDisconnecting, /* 49: channel disconnecting (closing) */
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xpcOpenCloseError, /* 50: channel open/close protocol error */
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xpcDisconnected, /* 51: channel disconnected (closed) */
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xpcUnknownReason /* 52: unknown reason -- must be last in list */
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};
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/*
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* Define the callout function types used by XPC to update the user on
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* connection activity and state changes (via the user function registered by
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* xpc_connect()) and to notify them of messages received and delivered (via
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* the user function registered by xpc_send_notify()).
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*
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* The two function types are xpc_channel_func and xpc_notify_func and
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* both share the following arguments, with the exception of "data", which
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* only xpc_channel_func has.
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*
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* Arguments:
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*
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* reason - reason code. (See following table.)
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* partid - partition ID associated with condition.
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* ch_number - channel # associated with condition.
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* data - pointer to optional data. (See following table.)
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* key - pointer to optional user-defined value provided as the "key"
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* argument to xpc_connect() or xpc_send_notify().
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*
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* In the following table the "Optional Data" column applies to callouts made
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* to functions registered by xpc_connect(). A "NA" in that column indicates
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* that this reason code can be passed to functions registered by
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* xpc_send_notify() (i.e. they don't have data arguments).
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*
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* Also, the first three reason codes in the following table indicate
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* success, whereas the others indicate failure. When a failure reason code
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* is received, one can assume that the channel is not connected.
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*
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*
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* Reason Code | Cause | Optional Data
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* =====================+================================+=====================
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* xpcConnected | connection has been established| max #of entries
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* | to the specified partition on | allowed in message
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* | the specified channel | queue
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* ---------------------+--------------------------------+---------------------
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* xpcMsgReceived | an XPC message arrived from | address of payload
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* | the specified partition on the |
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* | specified channel | [the user must call
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* | | xpc_received() when
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* | | finished with the
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* | | payload]
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* ---------------------+--------------------------------+---------------------
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* xpcMsgDelivered | notification that the message | NA
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* | was delivered to the intended |
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* | recipient and that they have |
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* | acknowledged its receipt by |
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* | calling xpc_received() |
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* =====================+================================+=====================
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* xpcUnequalMsgSizes | can't connect to the specified | NULL
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* | partition on the specified |
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* | channel because of mismatched |
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* | message sizes |
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* ---------------------+--------------------------------+---------------------
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* xpcNoMemory | insufficient memory avaiable | NULL
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* | to allocate message queue |
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* ---------------------+--------------------------------+---------------------
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* xpcLackOfResources | lack of resources to create | NULL
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* | the necessary kthreads to |
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* | support the channel |
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* ---------------------+--------------------------------+---------------------
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* xpcUnregistering | this side's user has | NULL or NA
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* | unregistered by calling |
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* | xpc_disconnect() |
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* ---------------------+--------------------------------+---------------------
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* xpcOtherUnregistering| the other side's user has | NULL or NA
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* | unregistered by calling |
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* | xpc_disconnect() |
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* ---------------------+--------------------------------+---------------------
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* xpcNoHeartbeat | the other side's XPC is no | NULL or NA
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* | longer heartbeating |
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* | |
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* ---------------------+--------------------------------+---------------------
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* xpcUnloading | this side's XPC module is | NULL or NA
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* | being unloaded |
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* | |
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* ---------------------+--------------------------------+---------------------
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* xpcOtherUnloading | the other side's XPC module is | NULL or NA
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* | is being unloaded |
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* | |
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* ---------------------+--------------------------------+---------------------
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* xpcPioReadError | xp_nofault_PIOR() returned an | NULL or NA
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* | error while sending an IPI |
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* | |
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* ---------------------+--------------------------------+---------------------
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* xpcInvalidAddress | the address either received or | NULL or NA
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* | sent by the specified partition|
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* | is invalid |
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* ---------------------+--------------------------------+---------------------
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* xpcBteNotAvailable | attempt to pull data from the | NULL or NA
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* xpcBtePoisonError | specified partition over the |
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* xpcBteWriteError | specified channel via a |
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* xpcBteAccessError | bte_copy() failed |
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* xpcBteTimeOutError | |
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* xpcBteXtalkError | |
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* xpcBteDirectoryError | |
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* xpcBteGenericError | |
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* xpcBteUnmappedError | |
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* ---------------------+--------------------------------+---------------------
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* xpcUnknownReason | the specified channel to the | NULL or NA
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* | specified partition was |
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* | unavailable for unknown reasons|
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* =====================+================================+=====================
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*/
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typedef void (*xpc_channel_func)(enum xpc_retval reason, partid_t partid,
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int ch_number, void *data, void *key);
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typedef void (*xpc_notify_func)(enum xpc_retval reason, partid_t partid,
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int ch_number, void *key);
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/*
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* The following is a registration entry. There is a global array of these,
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* one per channel. It is used to record the connection registration made
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* by the users of XPC. As long as a registration entry exists, for any
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* partition that comes up, XPC will attempt to establish a connection on
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* that channel. Notification that a connection has been made will occur via
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* the xpc_channel_func function.
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*
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* The 'func' field points to the function to call when aynchronous
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* notification is required for such events as: a connection established/lost,
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* or an incoming message received, or an error condition encountered. A
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* non-NULL 'func' field indicates that there is an active registration for
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* the channel.
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*/
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struct xpc_registration {
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struct mutex mutex;
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xpc_channel_func func; /* function to call */
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void *key; /* pointer to user's key */
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u16 nentries; /* #of msg entries in local msg queue */
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u16 msg_size; /* message queue's message size */
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u32 assigned_limit; /* limit on #of assigned kthreads */
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u32 idle_limit; /* limit on #of idle kthreads */
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} ____cacheline_aligned;
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#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
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/* the following are valid xpc_allocate() flags */
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#define XPC_WAIT 0 /* wait flag */
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#define XPC_NOWAIT 1 /* no wait flag */
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struct xpc_interface {
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void (*connect)(int);
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void (*disconnect)(int);
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enum xpc_retval (*allocate)(partid_t, int, u32, void **);
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enum xpc_retval (*send)(partid_t, int, void *);
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enum xpc_retval (*send_notify)(partid_t, int, void *,
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xpc_notify_func, void *);
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void (*received)(partid_t, int, void *);
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enum xpc_retval (*partid_to_nasids)(partid_t, void *);
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};
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extern struct xpc_interface xpc_interface;
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extern void xpc_set_interface(void (*)(int),
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void (*)(int),
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enum xpc_retval (*)(partid_t, int, u32, void **),
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enum xpc_retval (*)(partid_t, int, void *),
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enum xpc_retval (*)(partid_t, int, void *, xpc_notify_func,
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void *),
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void (*)(partid_t, int, void *),
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enum xpc_retval (*)(partid_t, void *));
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extern void xpc_clear_interface(void);
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extern enum xpc_retval xpc_connect(int, xpc_channel_func, void *, u16,
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u16, u32, u32);
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extern void xpc_disconnect(int);
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static inline enum xpc_retval
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xpc_allocate(partid_t partid, int ch_number, u32 flags, void **payload)
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{
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return xpc_interface.allocate(partid, ch_number, flags, payload);
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}
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static inline enum xpc_retval
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xpc_send(partid_t partid, int ch_number, void *payload)
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{
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return xpc_interface.send(partid, ch_number, payload);
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}
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static inline enum xpc_retval
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xpc_send_notify(partid_t partid, int ch_number, void *payload,
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xpc_notify_func func, void *key)
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{
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return xpc_interface.send_notify(partid, ch_number, payload, func, key);
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}
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static inline void
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xpc_received(partid_t partid, int ch_number, void *payload)
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{
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return xpc_interface.received(partid, ch_number, payload);
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}
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static inline enum xpc_retval
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xpc_partid_to_nasids(partid_t partid, void *nasids)
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{
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return xpc_interface.partid_to_nasids(partid, nasids);
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}
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extern u64 xp_nofault_PIOR_target;
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extern int xp_nofault_PIOR(void *);
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extern int xp_error_PIOR(void);
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#endif /* _ASM_IA64_SN_XP_H */
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