145d9ca49SDean Nelson /* 245d9ca49SDean Nelson * This file is subject to the terms and conditions of the GNU General Public 345d9ca49SDean Nelson * License. See the file "COPYING" in the main directory of this archive 445d9ca49SDean Nelson * for more details. 545d9ca49SDean Nelson * 645d9ca49SDean Nelson * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved. 745d9ca49SDean Nelson */ 845d9ca49SDean Nelson 945d9ca49SDean Nelson /* 1045d9ca49SDean Nelson * Cross Partition Communication (XPC) structures and macros. 1145d9ca49SDean Nelson */ 1245d9ca49SDean Nelson 1345d9ca49SDean Nelson #ifndef _DRIVERS_MISC_SGIXP_XPC_H 1445d9ca49SDean Nelson #define _DRIVERS_MISC_SGIXP_XPC_H 1545d9ca49SDean Nelson 1645d9ca49SDean Nelson #include <linux/interrupt.h> 1745d9ca49SDean Nelson #include <linux/sysctl.h> 1845d9ca49SDean Nelson #include <linux/device.h> 1945d9ca49SDean Nelson #include <linux/mutex.h> 2045d9ca49SDean Nelson #include <linux/completion.h> 2145d9ca49SDean Nelson #include <asm/pgtable.h> 2245d9ca49SDean Nelson #include <asm/processor.h> 2345d9ca49SDean Nelson #include <asm/sn/clksupport.h> 2445d9ca49SDean Nelson #include <asm/sn/addrs.h> 2545d9ca49SDean Nelson #include <asm/sn/mspec.h> 2645d9ca49SDean Nelson #include <asm/sn/shub_mmr.h> 2745d9ca49SDean Nelson #include "xp.h" 2845d9ca49SDean Nelson 2945d9ca49SDean Nelson /* 3045d9ca49SDean Nelson * XPC Version numbers consist of a major and minor number. XPC can always 3145d9ca49SDean Nelson * talk to versions with same major #, and never talk to versions with a 3245d9ca49SDean Nelson * different major #. 3345d9ca49SDean Nelson */ 3445d9ca49SDean Nelson #define _XPC_VERSION(_maj, _min) (((_maj) << 4) | ((_min) & 0xf)) 3545d9ca49SDean Nelson #define XPC_VERSION_MAJOR(_v) ((_v) >> 4) 3645d9ca49SDean Nelson #define XPC_VERSION_MINOR(_v) ((_v) & 0xf) 3745d9ca49SDean Nelson 3845d9ca49SDean Nelson /* 3945d9ca49SDean Nelson * The next macros define word or bit representations for given 4045d9ca49SDean Nelson * C-brick nasid in either the SAL provided bit array representing 4145d9ca49SDean Nelson * nasids in the partition/machine or the AMO_t array used for 4245d9ca49SDean Nelson * inter-partition initiation communications. 4345d9ca49SDean Nelson * 4445d9ca49SDean Nelson * For SN2 machines, C-Bricks are alway even numbered NASIDs. As 4545d9ca49SDean Nelson * such, some space will be saved by insisting that nasid information 4645d9ca49SDean Nelson * passed from SAL always be packed for C-Bricks and the 4745d9ca49SDean Nelson * cross-partition interrupts use the same packing scheme. 4845d9ca49SDean Nelson */ 4945d9ca49SDean Nelson #define XPC_NASID_W_INDEX(_n) (((_n) / 64) / 2) 5045d9ca49SDean Nelson #define XPC_NASID_B_INDEX(_n) (((_n) / 2) & (64 - 1)) 5145d9ca49SDean Nelson #define XPC_NASID_IN_ARRAY(_n, _p) ((_p)[XPC_NASID_W_INDEX(_n)] & \ 5245d9ca49SDean Nelson (1UL << XPC_NASID_B_INDEX(_n))) 5345d9ca49SDean Nelson #define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2) 5445d9ca49SDean Nelson 5545d9ca49SDean Nelson #define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */ 5645d9ca49SDean Nelson #define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */ 5745d9ca49SDean Nelson 5845d9ca49SDean Nelson /* define the process name of HB checker and the CPU it is pinned to */ 5945d9ca49SDean Nelson #define XPC_HB_CHECK_THREAD_NAME "xpc_hb" 6045d9ca49SDean Nelson #define XPC_HB_CHECK_CPU 0 6145d9ca49SDean Nelson 6245d9ca49SDean Nelson /* define the process name of the discovery thread */ 6345d9ca49SDean Nelson #define XPC_DISCOVERY_THREAD_NAME "xpc_discovery" 6445d9ca49SDean Nelson 6545d9ca49SDean Nelson /* 6645d9ca49SDean Nelson * the reserved page 6745d9ca49SDean Nelson * 6845d9ca49SDean Nelson * SAL reserves one page of memory per partition for XPC. Though a full page 6945d9ca49SDean Nelson * in length (16384 bytes), its starting address is not page aligned, but it 7045d9ca49SDean Nelson * is cacheline aligned. The reserved page consists of the following: 7145d9ca49SDean Nelson * 7245d9ca49SDean Nelson * reserved page header 7345d9ca49SDean Nelson * 7494bd2708SDean Nelson * The first two 64-byte cachelines of the reserved page contain the 7594bd2708SDean Nelson * header (struct xpc_rsvd_page). Before SAL initialization has completed, 7645d9ca49SDean Nelson * SAL has set up the following fields of the reserved page header: 7794bd2708SDean Nelson * SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The 7894bd2708SDean Nelson * other fields are set up by XPC. (xpc_rsvd_page points to the local 7945d9ca49SDean Nelson * partition's reserved page.) 8045d9ca49SDean Nelson * 8145d9ca49SDean Nelson * part_nasids mask 8245d9ca49SDean Nelson * mach_nasids mask 8345d9ca49SDean Nelson * 8445d9ca49SDean Nelson * SAL also sets up two bitmaps (or masks), one that reflects the actual 8545d9ca49SDean Nelson * nasids in this partition (part_nasids), and the other that reflects 8645d9ca49SDean Nelson * the actual nasids in the entire machine (mach_nasids). We're only 8745d9ca49SDean Nelson * interested in the even numbered nasids (which contain the processors 8845d9ca49SDean Nelson * and/or memory), so we only need half as many bits to represent the 8945d9ca49SDean Nelson * nasids. The part_nasids mask is located starting at the first cacheline 9045d9ca49SDean Nelson * following the reserved page header. The mach_nasids mask follows right 9145d9ca49SDean Nelson * after the part_nasids mask. The size in bytes of each mask is reflected 9294bd2708SDean Nelson * by the reserved page header field 'SAL_nasids_size'. (Local partition's 9345d9ca49SDean Nelson * mask pointers are xpc_part_nasids and xpc_mach_nasids.) 9445d9ca49SDean Nelson * 9594bd2708SDean Nelson * vars (ia64-sn2 only) 9694bd2708SDean Nelson * vars part (ia64-sn2 only) 9745d9ca49SDean Nelson * 9845d9ca49SDean Nelson * Immediately following the mach_nasids mask are the XPC variables 9945d9ca49SDean Nelson * required by other partitions. First are those that are generic to all 10045d9ca49SDean Nelson * partitions (vars), followed on the next available cacheline by those 10145d9ca49SDean Nelson * which are partition specific (vars part). These are setup by XPC. 10245d9ca49SDean Nelson * (Local partition's vars pointers are xpc_vars and xpc_vars_part.) 10345d9ca49SDean Nelson * 10494bd2708SDean Nelson * Note: Until 'stamp' is set non-zero, the partition XPC code has not been 10594bd2708SDean Nelson * initialized. 10645d9ca49SDean Nelson */ 10745d9ca49SDean Nelson struct xpc_rsvd_page { 10845d9ca49SDean Nelson u64 SAL_signature; /* SAL: unique signature */ 10945d9ca49SDean Nelson u64 SAL_version; /* SAL: version */ 11094bd2708SDean Nelson short SAL_partid; /* SAL: partition ID */ 11194bd2708SDean Nelson short max_npartitions; /* value of XPC_MAX_PARTITIONS */ 11245d9ca49SDean Nelson u8 version; 11394bd2708SDean Nelson u8 pad1[3]; /* align to next u64 in 1st 64-byte cacheline */ 11494bd2708SDean Nelson union { 1152c2b94f9SDean Nelson u64 vars_pa; /* physical address of struct xpc_vars */ 11694bd2708SDean Nelson u64 activate_mq_gpa; /* global phys address of activate_mq */ 11794bd2708SDean Nelson } sn; 11845d9ca49SDean Nelson struct timespec stamp; /* time when reserved page was setup by XPC */ 11994bd2708SDean Nelson u64 pad2[9]; /* align to last u64 in 2nd 64-byte cacheline */ 12094bd2708SDean Nelson u64 SAL_nasids_size; /* SAL: size of each nasid mask in bytes */ 12145d9ca49SDean Nelson }; 12245d9ca49SDean Nelson 12394bd2708SDean Nelson #define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */ 12445d9ca49SDean Nelson 12545d9ca49SDean Nelson #define XPC_SUPPORTS_RP_STAMP(_version) \ 12645d9ca49SDean Nelson (_version >= _XPC_VERSION(1, 1)) 12745d9ca49SDean Nelson 12894bd2708SDean Nelson #define ZERO_STAMP ((struct timespec){0, 0}) 12945d9ca49SDean Nelson /* 13045d9ca49SDean Nelson * compare stamps - the return value is: 13145d9ca49SDean Nelson * 13245d9ca49SDean Nelson * < 0, if stamp1 < stamp2 13345d9ca49SDean Nelson * = 0, if stamp1 == stamp2 13445d9ca49SDean Nelson * > 0, if stamp1 > stamp2 13545d9ca49SDean Nelson */ 13645d9ca49SDean Nelson static inline int 13745d9ca49SDean Nelson xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2) 13845d9ca49SDean Nelson { 13945d9ca49SDean Nelson int ret; 14045d9ca49SDean Nelson 1412c2b94f9SDean Nelson ret = stamp1->tv_sec - stamp2->tv_sec; 1422c2b94f9SDean Nelson if (ret == 0) 14345d9ca49SDean Nelson ret = stamp1->tv_nsec - stamp2->tv_nsec; 1442c2b94f9SDean Nelson 14545d9ca49SDean Nelson return ret; 14645d9ca49SDean Nelson } 14745d9ca49SDean Nelson 14845d9ca49SDean Nelson /* 14945d9ca49SDean Nelson * Define the structures by which XPC variables can be exported to other 15045d9ca49SDean Nelson * partitions. (There are two: struct xpc_vars and struct xpc_vars_part) 15145d9ca49SDean Nelson */ 15245d9ca49SDean Nelson 15345d9ca49SDean Nelson /* 15445d9ca49SDean Nelson * The following structure describes the partition generic variables 15545d9ca49SDean Nelson * needed by other partitions in order to properly initialize. 15645d9ca49SDean Nelson * 15745d9ca49SDean Nelson * struct xpc_vars version number also applies to struct xpc_vars_part. 15845d9ca49SDean Nelson * Changes to either structure and/or related functionality should be 15945d9ca49SDean Nelson * reflected by incrementing either the major or minor version numbers 16045d9ca49SDean Nelson * of struct xpc_vars. 16145d9ca49SDean Nelson */ 16245d9ca49SDean Nelson struct xpc_vars { 16345d9ca49SDean Nelson u8 version; 16445d9ca49SDean Nelson u64 heartbeat; 16545d9ca49SDean Nelson u64 heartbeating_to_mask; 16645d9ca49SDean Nelson u64 heartbeat_offline; /* if 0, heartbeat should be changing */ 16745d9ca49SDean Nelson int act_nasid; 16845d9ca49SDean Nelson int act_phys_cpuid; 16945d9ca49SDean Nelson u64 vars_part_pa; 17045d9ca49SDean Nelson u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */ 17145d9ca49SDean Nelson AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */ 17245d9ca49SDean Nelson }; 17345d9ca49SDean Nelson 17445d9ca49SDean Nelson #define XPC_V_VERSION _XPC_VERSION(3, 1) /* version 3.1 of the cross vars */ 17545d9ca49SDean Nelson 17645d9ca49SDean Nelson #define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \ 17745d9ca49SDean Nelson (_version >= _XPC_VERSION(3, 1)) 17845d9ca49SDean Nelson 17945d9ca49SDean Nelson static inline int 18064d032baSDean Nelson xpc_hb_allowed(short partid, struct xpc_vars *vars) 18145d9ca49SDean Nelson { 18245d9ca49SDean Nelson return ((vars->heartbeating_to_mask & (1UL << partid)) != 0); 18345d9ca49SDean Nelson } 18445d9ca49SDean Nelson 18545d9ca49SDean Nelson static inline void 18664d032baSDean Nelson xpc_allow_hb(short partid, struct xpc_vars *vars) 18745d9ca49SDean Nelson { 18845d9ca49SDean Nelson u64 old_mask, new_mask; 18945d9ca49SDean Nelson 19045d9ca49SDean Nelson do { 19145d9ca49SDean Nelson old_mask = vars->heartbeating_to_mask; 19245d9ca49SDean Nelson new_mask = (old_mask | (1UL << partid)); 19345d9ca49SDean Nelson } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 19445d9ca49SDean Nelson old_mask); 19545d9ca49SDean Nelson } 19645d9ca49SDean Nelson 19745d9ca49SDean Nelson static inline void 19864d032baSDean Nelson xpc_disallow_hb(short partid, struct xpc_vars *vars) 19945d9ca49SDean Nelson { 20045d9ca49SDean Nelson u64 old_mask, new_mask; 20145d9ca49SDean Nelson 20245d9ca49SDean Nelson do { 20345d9ca49SDean Nelson old_mask = vars->heartbeating_to_mask; 20445d9ca49SDean Nelson new_mask = (old_mask & ~(1UL << partid)); 20545d9ca49SDean Nelson } while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) != 20645d9ca49SDean Nelson old_mask); 20745d9ca49SDean Nelson } 20845d9ca49SDean Nelson 20945d9ca49SDean Nelson /* 21045d9ca49SDean Nelson * The AMOs page consists of a number of AMO variables which are divided into 21145d9ca49SDean Nelson * four groups, The first two groups are used to identify an IRQ's sender. 21245d9ca49SDean Nelson * These two groups consist of 64 and 128 AMO variables respectively. The last 21345d9ca49SDean Nelson * two groups, consisting of just one AMO variable each, are used to identify 21445d9ca49SDean Nelson * the remote partitions that are currently engaged (from the viewpoint of 21545d9ca49SDean Nelson * the XPC running on the remote partition). 21645d9ca49SDean Nelson */ 21745d9ca49SDean Nelson #define XPC_NOTIFY_IRQ_AMOS 0 218bc63d387SDean Nelson #define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_NPARTITIONS_SN2) 21945d9ca49SDean Nelson #define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS) 22045d9ca49SDean Nelson #define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1) 22145d9ca49SDean Nelson 22245d9ca49SDean Nelson /* 22345d9ca49SDean Nelson * The following structure describes the per partition specific variables. 22445d9ca49SDean Nelson * 22545d9ca49SDean Nelson * An array of these structures, one per partition, will be defined. As a 22645d9ca49SDean Nelson * partition becomes active XPC will copy the array entry corresponding to 22794bd2708SDean Nelson * itself from that partition. It is desirable that the size of this structure 22894bd2708SDean Nelson * evenly divides into a 128-byte cacheline, such that none of the entries in 22994bd2708SDean Nelson * this array crosses a 128-byte cacheline boundary. As it is now, each entry 230e17d416bSDean Nelson * occupies 64-bytes. 23145d9ca49SDean Nelson */ 232e17d416bSDean Nelson struct xpc_vars_part_sn2 { 2332c2b94f9SDean Nelson u64 magic; 23445d9ca49SDean Nelson 23545d9ca49SDean Nelson u64 openclose_args_pa; /* physical address of open and close args */ 23645d9ca49SDean Nelson u64 GPs_pa; /* physical address of Get/Put values */ 23745d9ca49SDean Nelson 23845d9ca49SDean Nelson u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */ 23945d9ca49SDean Nelson int IPI_nasid; /* nasid of where to send IPIs */ 24045d9ca49SDean Nelson int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */ 24145d9ca49SDean Nelson 24245d9ca49SDean Nelson u8 nchannels; /* #of defined channels supported */ 24345d9ca49SDean Nelson 24445d9ca49SDean Nelson u8 reserved[23]; /* pad to a full 64 bytes */ 24545d9ca49SDean Nelson }; 24645d9ca49SDean Nelson 24745d9ca49SDean Nelson /* 24845d9ca49SDean Nelson * The vars_part MAGIC numbers play a part in the first contact protocol. 24945d9ca49SDean Nelson * 25045d9ca49SDean Nelson * MAGIC1 indicates that the per partition specific variables for a remote 25145d9ca49SDean Nelson * partition have been initialized by this partition. 25245d9ca49SDean Nelson * 25345d9ca49SDean Nelson * MAGIC2 indicates that this partition has pulled the remote partititions 25445d9ca49SDean Nelson * per partition variables that pertain to this partition. 25545d9ca49SDean Nelson */ 25645d9ca49SDean Nelson #define XPC_VP_MAGIC1 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */ 25745d9ca49SDean Nelson #define XPC_VP_MAGIC2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */ 25845d9ca49SDean Nelson 25945d9ca49SDean Nelson /* the reserved page sizes and offsets */ 26045d9ca49SDean Nelson 26145d9ca49SDean Nelson #define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)) 26245d9ca49SDean Nelson #define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars)) 26345d9ca49SDean Nelson 2642c2b94f9SDean Nelson #define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE)) 26545d9ca49SDean Nelson #define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words) 2662c2b94f9SDean Nelson #define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \ 2672c2b94f9SDean Nelson xp_nasid_mask_words)) 26845d9ca49SDean Nelson 26945d9ca49SDean Nelson /* 27045d9ca49SDean Nelson * Functions registered by add_timer() or called by kernel_thread() only 27145d9ca49SDean Nelson * allow for a single 64-bit argument. The following macros can be used to 27245d9ca49SDean Nelson * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from 27345d9ca49SDean Nelson * the passed argument. 27445d9ca49SDean Nelson */ 27545d9ca49SDean Nelson #define XPC_PACK_ARGS(_arg1, _arg2) \ 27645d9ca49SDean Nelson ((((u64) _arg1) & 0xffffffff) | \ 27745d9ca49SDean Nelson ((((u64) _arg2) & 0xffffffff) << 32)) 27845d9ca49SDean Nelson 27945d9ca49SDean Nelson #define XPC_UNPACK_ARG1(_args) (((u64) _args) & 0xffffffff) 28045d9ca49SDean Nelson #define XPC_UNPACK_ARG2(_args) ((((u64) _args) >> 32) & 0xffffffff) 28145d9ca49SDean Nelson 28245d9ca49SDean Nelson /* 28345d9ca49SDean Nelson * Define a Get/Put value pair (pointers) used with a message queue. 28445d9ca49SDean Nelson */ 28545d9ca49SDean Nelson struct xpc_gp { 2862c2b94f9SDean Nelson s64 get; /* Get value */ 2872c2b94f9SDean Nelson s64 put; /* Put value */ 28845d9ca49SDean Nelson }; 28945d9ca49SDean Nelson 29045d9ca49SDean Nelson #define XPC_GP_SIZE \ 291bc63d387SDean Nelson L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_MAX_NCHANNELS) 29245d9ca49SDean Nelson 29345d9ca49SDean Nelson /* 29445d9ca49SDean Nelson * Define a structure that contains arguments associated with opening and 29545d9ca49SDean Nelson * closing a channel. 29645d9ca49SDean Nelson */ 29745d9ca49SDean Nelson struct xpc_openclose_args { 29845d9ca49SDean Nelson u16 reason; /* reason why channel is closing */ 29945d9ca49SDean Nelson u16 msg_size; /* sizeof each message entry */ 30045d9ca49SDean Nelson u16 remote_nentries; /* #of message entries in remote msg queue */ 30145d9ca49SDean Nelson u16 local_nentries; /* #of message entries in local msg queue */ 30245d9ca49SDean Nelson u64 local_msgqueue_pa; /* physical address of local message queue */ 30345d9ca49SDean Nelson }; 30445d9ca49SDean Nelson 30545d9ca49SDean Nelson #define XPC_OPENCLOSE_ARGS_SIZE \ 306bc63d387SDean Nelson L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \ 307bc63d387SDean Nelson XPC_MAX_NCHANNELS) 30845d9ca49SDean Nelson 30945d9ca49SDean Nelson /* struct xpc_msg flags */ 31045d9ca49SDean Nelson 31145d9ca49SDean Nelson #define XPC_M_DONE 0x01 /* msg has been received/consumed */ 31245d9ca49SDean Nelson #define XPC_M_READY 0x02 /* msg is ready to be sent */ 31345d9ca49SDean Nelson #define XPC_M_INTERRUPT 0x04 /* send interrupt when msg consumed */ 31445d9ca49SDean Nelson 31545d9ca49SDean Nelson #define XPC_MSG_ADDRESS(_payload) \ 31645d9ca49SDean Nelson ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET)) 31745d9ca49SDean Nelson 31845d9ca49SDean Nelson /* 31945d9ca49SDean Nelson * Defines notify entry. 32045d9ca49SDean Nelson * 32145d9ca49SDean Nelson * This is used to notify a message's sender that their message was received 32245d9ca49SDean Nelson * and consumed by the intended recipient. 32345d9ca49SDean Nelson */ 32445d9ca49SDean Nelson struct xpc_notify { 3252c2b94f9SDean Nelson u8 type; /* type of notification */ 32645d9ca49SDean Nelson 32745d9ca49SDean Nelson /* the following two fields are only used if type == XPC_N_CALL */ 32845d9ca49SDean Nelson xpc_notify_func func; /* user's notify function */ 32945d9ca49SDean Nelson void *key; /* pointer to user's key */ 33045d9ca49SDean Nelson }; 33145d9ca49SDean Nelson 33245d9ca49SDean Nelson /* struct xpc_notify type of notification */ 33345d9ca49SDean Nelson 33445d9ca49SDean Nelson #define XPC_N_CALL 0x01 /* notify function provided by user */ 33545d9ca49SDean Nelson 33645d9ca49SDean Nelson /* 33745d9ca49SDean Nelson * Define the structure that manages all the stuff required by a channel. In 33845d9ca49SDean Nelson * particular, they are used to manage the messages sent across the channel. 33945d9ca49SDean Nelson * 34045d9ca49SDean Nelson * This structure is private to a partition, and is NOT shared across the 34145d9ca49SDean Nelson * partition boundary. 34245d9ca49SDean Nelson * 34345d9ca49SDean Nelson * There is an array of these structures for each remote partition. It is 34445d9ca49SDean Nelson * allocated at the time a partition becomes active. The array contains one 34545d9ca49SDean Nelson * of these structures for each potential channel connection to that partition. 34645d9ca49SDean Nelson * 34745d9ca49SDean Nelson * Each of these structures manages two message queues (circular buffers). 34845d9ca49SDean Nelson * They are allocated at the time a channel connection is made. One of 34945d9ca49SDean Nelson * these message queues (local_msgqueue) holds the locally created messages 35045d9ca49SDean Nelson * that are destined for the remote partition. The other of these message 35145d9ca49SDean Nelson * queues (remote_msgqueue) is a locally cached copy of the remote partition's 35245d9ca49SDean Nelson * own local_msgqueue. 35345d9ca49SDean Nelson * 35445d9ca49SDean Nelson * The following is a description of the Get/Put pointers used to manage these 35545d9ca49SDean Nelson * two message queues. Consider the local_msgqueue to be on one partition 35645d9ca49SDean Nelson * and the remote_msgqueue to be its cached copy on another partition. A 35745d9ca49SDean Nelson * description of what each of the lettered areas contains is included. 35845d9ca49SDean Nelson * 35945d9ca49SDean Nelson * 36045d9ca49SDean Nelson * local_msgqueue remote_msgqueue 36145d9ca49SDean Nelson * 36245d9ca49SDean Nelson * |/////////| |/////////| 36345d9ca49SDean Nelson * w_remote_GP.get --> +---------+ |/////////| 36445d9ca49SDean Nelson * | F | |/////////| 36545d9ca49SDean Nelson * remote_GP.get --> +---------+ +---------+ <-- local_GP->get 36645d9ca49SDean Nelson * | | | | 36745d9ca49SDean Nelson * | | | E | 36845d9ca49SDean Nelson * | | | | 36945d9ca49SDean Nelson * | | +---------+ <-- w_local_GP.get 37045d9ca49SDean Nelson * | B | |/////////| 37145d9ca49SDean Nelson * | | |////D////| 37245d9ca49SDean Nelson * | | |/////////| 37345d9ca49SDean Nelson * | | +---------+ <-- w_remote_GP.put 37445d9ca49SDean Nelson * | | |////C////| 37545d9ca49SDean Nelson * local_GP->put --> +---------+ +---------+ <-- remote_GP.put 37645d9ca49SDean Nelson * | | |/////////| 37745d9ca49SDean Nelson * | A | |/////////| 37845d9ca49SDean Nelson * | | |/////////| 37945d9ca49SDean Nelson * w_local_GP.put --> +---------+ |/////////| 38045d9ca49SDean Nelson * |/////////| |/////////| 38145d9ca49SDean Nelson * 38245d9ca49SDean Nelson * 38345d9ca49SDean Nelson * ( remote_GP.[get|put] are cached copies of the remote 38445d9ca49SDean Nelson * partition's local_GP->[get|put], and thus their values can 38545d9ca49SDean Nelson * lag behind their counterparts on the remote partition. ) 38645d9ca49SDean Nelson * 38745d9ca49SDean Nelson * 38845d9ca49SDean Nelson * A - Messages that have been allocated, but have not yet been sent to the 38945d9ca49SDean Nelson * remote partition. 39045d9ca49SDean Nelson * 39145d9ca49SDean Nelson * B - Messages that have been sent, but have not yet been acknowledged by the 39245d9ca49SDean Nelson * remote partition as having been received. 39345d9ca49SDean Nelson * 39445d9ca49SDean Nelson * C - Area that needs to be prepared for the copying of sent messages, by 39545d9ca49SDean Nelson * the clearing of the message flags of any previously received messages. 39645d9ca49SDean Nelson * 39745d9ca49SDean Nelson * D - Area into which sent messages are to be copied from the remote 39845d9ca49SDean Nelson * partition's local_msgqueue and then delivered to their intended 39945d9ca49SDean Nelson * recipients. [ To allow for a multi-message copy, another pointer 40045d9ca49SDean Nelson * (next_msg_to_pull) has been added to keep track of the next message 40145d9ca49SDean Nelson * number needing to be copied (pulled). It chases after w_remote_GP.put. 40245d9ca49SDean Nelson * Any messages lying between w_local_GP.get and next_msg_to_pull have 40345d9ca49SDean Nelson * been copied and are ready to be delivered. ] 40445d9ca49SDean Nelson * 40545d9ca49SDean Nelson * E - Messages that have been copied and delivered, but have not yet been 40645d9ca49SDean Nelson * acknowledged by the recipient as having been received. 40745d9ca49SDean Nelson * 40845d9ca49SDean Nelson * F - Messages that have been acknowledged, but XPC has not yet notified the 40945d9ca49SDean Nelson * sender that the message was received by its intended recipient. 41045d9ca49SDean Nelson * This is also an area that needs to be prepared for the allocating of 41145d9ca49SDean Nelson * new messages, by the clearing of the message flags of the acknowledged 41245d9ca49SDean Nelson * messages. 41345d9ca49SDean Nelson */ 41445d9ca49SDean Nelson struct xpc_channel { 41564d032baSDean Nelson short partid; /* ID of remote partition connected */ 41645d9ca49SDean Nelson spinlock_t lock; /* lock for updating this structure */ 41745d9ca49SDean Nelson u32 flags; /* general flags */ 41845d9ca49SDean Nelson 41965c17b80SDean Nelson enum xp_retval reason; /* reason why channel is disconnect'g */ 42045d9ca49SDean Nelson int reason_line; /* line# disconnect initiated from */ 42145d9ca49SDean Nelson 42245d9ca49SDean Nelson u16 number; /* channel # */ 42345d9ca49SDean Nelson 42445d9ca49SDean Nelson u16 msg_size; /* sizeof each msg entry */ 42545d9ca49SDean Nelson u16 local_nentries; /* #of msg entries in local msg queue */ 42645d9ca49SDean Nelson u16 remote_nentries; /* #of msg entries in remote msg queue */ 42745d9ca49SDean Nelson 42845d9ca49SDean Nelson void *local_msgqueue_base; /* base address of kmalloc'd space */ 42945d9ca49SDean Nelson struct xpc_msg *local_msgqueue; /* local message queue */ 43045d9ca49SDean Nelson void *remote_msgqueue_base; /* base address of kmalloc'd space */ 43145d9ca49SDean Nelson struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */ 43245d9ca49SDean Nelson /* local message queue */ 43345d9ca49SDean Nelson u64 remote_msgqueue_pa; /* phys addr of remote partition's */ 43445d9ca49SDean Nelson /* local message queue */ 43545d9ca49SDean Nelson 43645d9ca49SDean Nelson atomic_t references; /* #of external references to queues */ 43745d9ca49SDean Nelson 43845d9ca49SDean Nelson atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */ 43945d9ca49SDean Nelson wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */ 44045d9ca49SDean Nelson 44145d9ca49SDean Nelson u8 delayed_IPI_flags; /* IPI flags received, but delayed */ 44245d9ca49SDean Nelson /* action until channel disconnected */ 44345d9ca49SDean Nelson 44445d9ca49SDean Nelson /* queue of msg senders who want to be notified when msg received */ 44545d9ca49SDean Nelson 44645d9ca49SDean Nelson atomic_t n_to_notify; /* #of msg senders to notify */ 44745d9ca49SDean Nelson struct xpc_notify *notify_queue; /* notify queue for messages sent */ 44845d9ca49SDean Nelson 44945d9ca49SDean Nelson xpc_channel_func func; /* user's channel function */ 45045d9ca49SDean Nelson void *key; /* pointer to user's key */ 45145d9ca49SDean Nelson 45245d9ca49SDean Nelson struct mutex msg_to_pull_mutex; /* next msg to pull serialization */ 45345d9ca49SDean Nelson struct completion wdisconnect_wait; /* wait for channel disconnect */ 45445d9ca49SDean Nelson 45545d9ca49SDean Nelson struct xpc_openclose_args *local_openclose_args; /* args passed on */ 45645d9ca49SDean Nelson /* opening or closing of channel */ 45745d9ca49SDean Nelson 45845d9ca49SDean Nelson /* various flavors of local and remote Get/Put values */ 45945d9ca49SDean Nelson 46045d9ca49SDean Nelson struct xpc_gp *local_GP; /* local Get/Put values */ 46145d9ca49SDean Nelson struct xpc_gp remote_GP; /* remote Get/Put values */ 46245d9ca49SDean Nelson struct xpc_gp w_local_GP; /* working local Get/Put values */ 46345d9ca49SDean Nelson struct xpc_gp w_remote_GP; /* working remote Get/Put values */ 46445d9ca49SDean Nelson s64 next_msg_to_pull; /* Put value of next msg to pull */ 46545d9ca49SDean Nelson 46645d9ca49SDean Nelson /* kthread management related fields */ 46745d9ca49SDean Nelson 46845d9ca49SDean Nelson atomic_t kthreads_assigned; /* #of kthreads assigned to channel */ 46945d9ca49SDean Nelson u32 kthreads_assigned_limit; /* limit on #of kthreads assigned */ 47045d9ca49SDean Nelson atomic_t kthreads_idle; /* #of kthreads idle waiting for work */ 47145d9ca49SDean Nelson u32 kthreads_idle_limit; /* limit on #of kthreads idle */ 47245d9ca49SDean Nelson atomic_t kthreads_active; /* #of kthreads actively working */ 47345d9ca49SDean Nelson 47445d9ca49SDean Nelson wait_queue_head_t idle_wq; /* idle kthread wait queue */ 47545d9ca49SDean Nelson 47645d9ca49SDean Nelson } ____cacheline_aligned; 47745d9ca49SDean Nelson 47845d9ca49SDean Nelson /* struct xpc_channel flags */ 47945d9ca49SDean Nelson 48045d9ca49SDean Nelson #define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */ 48145d9ca49SDean Nelson 48245d9ca49SDean Nelson #define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */ 48345d9ca49SDean Nelson #define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */ 48445d9ca49SDean Nelson #define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */ 48545d9ca49SDean Nelson #define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */ 48645d9ca49SDean Nelson 48745d9ca49SDean Nelson #define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */ 48845d9ca49SDean Nelson #define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */ 48945d9ca49SDean Nelson #define XPC_C_CONNECTEDCALLOUT_MADE \ 49045d9ca49SDean Nelson 0x00000080 /* connected callout completed */ 49145d9ca49SDean Nelson #define XPC_C_CONNECTED 0x00000100 /* local channel is connected */ 49245d9ca49SDean Nelson #define XPC_C_CONNECTING 0x00000200 /* channel is being connected */ 49345d9ca49SDean Nelson 49445d9ca49SDean Nelson #define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */ 49545d9ca49SDean Nelson #define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */ 49645d9ca49SDean Nelson #define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */ 49745d9ca49SDean Nelson #define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */ 49845d9ca49SDean Nelson 49945d9ca49SDean Nelson #define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */ 50045d9ca49SDean Nelson #define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */ 50145d9ca49SDean Nelson #define XPC_C_DISCONNECTINGCALLOUT \ 50245d9ca49SDean Nelson 0x00010000 /* disconnecting callout initiated */ 50345d9ca49SDean Nelson #define XPC_C_DISCONNECTINGCALLOUT_MADE \ 50445d9ca49SDean Nelson 0x00020000 /* disconnecting callout completed */ 50545d9ca49SDean Nelson #define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */ 50645d9ca49SDean Nelson 50745d9ca49SDean Nelson /* 50845d9ca49SDean Nelson * Manages channels on a partition basis. There is one of these structures 50945d9ca49SDean Nelson * for each partition (a partition will never utilize the structure that 51045d9ca49SDean Nelson * represents itself). 51145d9ca49SDean Nelson */ 51245d9ca49SDean Nelson struct xpc_partition { 51345d9ca49SDean Nelson 51445d9ca49SDean Nelson /* XPC HB infrastructure */ 51545d9ca49SDean Nelson 51645d9ca49SDean Nelson u8 remote_rp_version; /* version# of partition's rsvd pg */ 51745d9ca49SDean Nelson struct timespec remote_rp_stamp; /* time when rsvd pg was initialized */ 51845d9ca49SDean Nelson u64 remote_rp_pa; /* phys addr of partition's rsvd pg */ 51945d9ca49SDean Nelson u64 remote_vars_pa; /* phys addr of partition's vars */ 52045d9ca49SDean Nelson u64 remote_vars_part_pa; /* phys addr of partition's vars part */ 52145d9ca49SDean Nelson u64 last_heartbeat; /* HB at last read */ 52245d9ca49SDean Nelson u64 remote_amos_page_pa; /* phys addr of partition's amos page */ 52345d9ca49SDean Nelson int remote_act_nasid; /* active part's act/deact nasid */ 52445d9ca49SDean Nelson int remote_act_phys_cpuid; /* active part's act/deact phys cpuid */ 52545d9ca49SDean Nelson u32 act_IRQ_rcvd; /* IRQs since activation */ 52645d9ca49SDean Nelson spinlock_t act_lock; /* protect updating of act_state */ 52745d9ca49SDean Nelson u8 act_state; /* from XPC HB viewpoint */ 52845d9ca49SDean Nelson u8 remote_vars_version; /* version# of partition's vars */ 52965c17b80SDean Nelson enum xp_retval reason; /* reason partition is deactivating */ 53045d9ca49SDean Nelson int reason_line; /* line# deactivation initiated from */ 53145d9ca49SDean Nelson int reactivate_nasid; /* nasid in partition to reactivate */ 53245d9ca49SDean Nelson 53345d9ca49SDean Nelson unsigned long disengage_request_timeout; /* timeout in jiffies */ 53445d9ca49SDean Nelson struct timer_list disengage_request_timer; 53545d9ca49SDean Nelson 53645d9ca49SDean Nelson /* XPC infrastructure referencing and teardown control */ 53745d9ca49SDean Nelson 5382c2b94f9SDean Nelson u8 setup_state; /* infrastructure setup state */ 53945d9ca49SDean Nelson wait_queue_head_t teardown_wq; /* kthread waiting to teardown infra */ 54045d9ca49SDean Nelson atomic_t references; /* #of references to infrastructure */ 54145d9ca49SDean Nelson 54245d9ca49SDean Nelson u8 nchannels; /* #of defined channels supported */ 54345d9ca49SDean Nelson atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */ 54445d9ca49SDean Nelson atomic_t nchannels_engaged; /* #of channels engaged with remote part */ 54545d9ca49SDean Nelson struct xpc_channel *channels; /* array of channel structures */ 54645d9ca49SDean Nelson 54745d9ca49SDean Nelson void *local_GPs_base; /* base address of kmalloc'd space */ 54845d9ca49SDean Nelson struct xpc_gp *local_GPs; /* local Get/Put values */ 54945d9ca49SDean Nelson void *remote_GPs_base; /* base address of kmalloc'd space */ 5502c2b94f9SDean Nelson struct xpc_gp *remote_GPs; /* copy of remote partition's local */ 5512c2b94f9SDean Nelson /* Get/Put values */ 55245d9ca49SDean Nelson u64 remote_GPs_pa; /* phys address of remote partition's local */ 55345d9ca49SDean Nelson /* Get/Put values */ 55445d9ca49SDean Nelson 55545d9ca49SDean Nelson /* fields used to pass args when opening or closing a channel */ 55645d9ca49SDean Nelson 55745d9ca49SDean Nelson void *local_openclose_args_base; /* base address of kmalloc'd space */ 55845d9ca49SDean Nelson struct xpc_openclose_args *local_openclose_args; /* local's args */ 55945d9ca49SDean Nelson void *remote_openclose_args_base; /* base address of kmalloc'd space */ 56045d9ca49SDean Nelson struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */ 56145d9ca49SDean Nelson /* args */ 56245d9ca49SDean Nelson u64 remote_openclose_args_pa; /* phys addr of remote's args */ 56345d9ca49SDean Nelson 56445d9ca49SDean Nelson /* IPI sending, receiving and handling related fields */ 56545d9ca49SDean Nelson 56645d9ca49SDean Nelson int remote_IPI_nasid; /* nasid of where to send IPIs */ 56745d9ca49SDean Nelson int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */ 56845d9ca49SDean Nelson AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */ 56945d9ca49SDean Nelson 57045d9ca49SDean Nelson AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */ 57145d9ca49SDean Nelson u64 local_IPI_amo; /* IPI amo flags yet to be handled */ 57245d9ca49SDean Nelson char IPI_owner[8]; /* IPI owner's name */ 57345d9ca49SDean Nelson struct timer_list dropped_IPI_timer; /* dropped IPI timer */ 57445d9ca49SDean Nelson 57545d9ca49SDean Nelson spinlock_t IPI_lock; /* IPI handler lock */ 57645d9ca49SDean Nelson 57745d9ca49SDean Nelson /* channel manager related fields */ 57845d9ca49SDean Nelson 57945d9ca49SDean Nelson atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */ 58045d9ca49SDean Nelson wait_queue_head_t channel_mgr_wq; /* channel mgr's wait queue */ 58145d9ca49SDean Nelson 58245d9ca49SDean Nelson } ____cacheline_aligned; 58345d9ca49SDean Nelson 58445d9ca49SDean Nelson /* struct xpc_partition act_state values (for XPC HB) */ 58545d9ca49SDean Nelson 58645d9ca49SDean Nelson #define XPC_P_INACTIVE 0x00 /* partition is not active */ 58745d9ca49SDean Nelson #define XPC_P_ACTIVATION_REQ 0x01 /* created thread to activate */ 58845d9ca49SDean Nelson #define XPC_P_ACTIVATING 0x02 /* activation thread started */ 58945d9ca49SDean Nelson #define XPC_P_ACTIVE 0x03 /* xpc_partition_up() was called */ 59045d9ca49SDean Nelson #define XPC_P_DEACTIVATING 0x04 /* partition deactivation initiated */ 59145d9ca49SDean Nelson 59245d9ca49SDean Nelson #define XPC_DEACTIVATE_PARTITION(_p, _reason) \ 59345d9ca49SDean Nelson xpc_deactivate_partition(__LINE__, (_p), (_reason)) 59445d9ca49SDean Nelson 59545d9ca49SDean Nelson /* struct xpc_partition setup_state values */ 59645d9ca49SDean Nelson 59745d9ca49SDean Nelson #define XPC_P_UNSET 0x00 /* infrastructure was never setup */ 59845d9ca49SDean Nelson #define XPC_P_SETUP 0x01 /* infrastructure is setup */ 59945d9ca49SDean Nelson #define XPC_P_WTEARDOWN 0x02 /* waiting to teardown infrastructure */ 60045d9ca49SDean Nelson #define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */ 60145d9ca49SDean Nelson 60245d9ca49SDean Nelson /* 60345d9ca49SDean Nelson * struct xpc_partition IPI_timer #of seconds to wait before checking for 60445d9ca49SDean Nelson * dropped IPIs. These occur whenever an IPI amo write doesn't complete until 60545d9ca49SDean Nelson * after the IPI was received. 60645d9ca49SDean Nelson */ 607e17d416bSDean Nelson #define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ) 60845d9ca49SDean Nelson 60945d9ca49SDean Nelson /* number of seconds to wait for other partitions to disengage */ 61045d9ca49SDean Nelson #define XPC_DISENGAGE_REQUEST_DEFAULT_TIMELIMIT 90 61145d9ca49SDean Nelson 61245d9ca49SDean Nelson /* interval in seconds to print 'waiting disengagement' messages */ 61345d9ca49SDean Nelson #define XPC_DISENGAGE_PRINTMSG_INTERVAL 10 61445d9ca49SDean Nelson 61564d032baSDean Nelson #define XPC_PARTID(_p) ((short)((_p) - &xpc_partitions[0])) 61645d9ca49SDean Nelson 61745d9ca49SDean Nelson /* found in xp_main.c */ 61845d9ca49SDean Nelson extern struct xpc_registration xpc_registrations[]; 61945d9ca49SDean Nelson 62045d9ca49SDean Nelson /* found in xpc_main.c */ 62145d9ca49SDean Nelson extern struct device *xpc_part; 62245d9ca49SDean Nelson extern struct device *xpc_chan; 62345d9ca49SDean Nelson extern int xpc_disengage_request_timelimit; 62445d9ca49SDean Nelson extern int xpc_disengage_request_timedout; 62545d9ca49SDean Nelson extern irqreturn_t xpc_notify_IRQ_handler(int, void *); 62645d9ca49SDean Nelson extern void xpc_dropped_IPI_check(struct xpc_partition *); 62745d9ca49SDean Nelson extern void xpc_activate_partition(struct xpc_partition *); 62845d9ca49SDean Nelson extern void xpc_activate_kthreads(struct xpc_channel *, int); 62945d9ca49SDean Nelson extern void xpc_create_kthreads(struct xpc_channel *, int, int); 63045d9ca49SDean Nelson extern void xpc_disconnect_wait(int); 63194bd2708SDean Nelson extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *); 632e17d416bSDean Nelson extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *); 633e17d416bSDean Nelson extern u64 (*xpc_get_IPI_flags) (struct xpc_partition *); 634e17d416bSDean Nelson extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *); 635e17d416bSDean Nelson extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *); 636e17d416bSDean Nelson extern void (*xpc_teardown_infrastructure) (struct xpc_partition *); 63794bd2708SDean Nelson 63894bd2708SDean Nelson /* found in xpc_sn2.c */ 63994bd2708SDean Nelson extern void xpc_init_sn2(void); 64094bd2708SDean Nelson extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */ 64194bd2708SDean Nelson 64294bd2708SDean Nelson /* found in xpc_uv.c */ 64394bd2708SDean Nelson extern void xpc_init_uv(void); 64494bd2708SDean Nelson 64545d9ca49SDean Nelson /* found in xpc_partition.c */ 64645d9ca49SDean Nelson extern int xpc_exiting; 64794bd2708SDean Nelson extern int xp_nasid_mask_words; 64845d9ca49SDean Nelson extern struct xpc_rsvd_page *xpc_rsvd_page; 649bc63d387SDean Nelson extern struct xpc_partition *xpc_partitions; 65045d9ca49SDean Nelson extern char *xpc_remote_copy_buffer; 65145d9ca49SDean Nelson extern void *xpc_remote_copy_buffer_base; 65245d9ca49SDean Nelson extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **); 65394bd2708SDean Nelson extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void); 65445d9ca49SDean Nelson extern void xpc_allow_IPI_ops(void); 65545d9ca49SDean Nelson extern void xpc_restrict_IPI_ops(void); 65645d9ca49SDean Nelson extern int xpc_identify_act_IRQ_sender(void); 65745d9ca49SDean Nelson extern int xpc_partition_disengaged(struct xpc_partition *); 65865c17b80SDean Nelson extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *); 65945d9ca49SDean Nelson extern void xpc_mark_partition_inactive(struct xpc_partition *); 66045d9ca49SDean Nelson extern void xpc_discovery(void); 66145d9ca49SDean Nelson extern void xpc_check_remote_hb(void); 66245d9ca49SDean Nelson extern void xpc_deactivate_partition(const int, struct xpc_partition *, 66365c17b80SDean Nelson enum xp_retval); 66464d032baSDean Nelson extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *); 66545d9ca49SDean Nelson 66645d9ca49SDean Nelson /* found in xpc_channel.c */ 667e17d416bSDean Nelson extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **); 66845d9ca49SDean Nelson extern void xpc_initiate_connect(int); 66945d9ca49SDean Nelson extern void xpc_initiate_disconnect(int); 67064d032baSDean Nelson extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **); 67164d032baSDean Nelson extern enum xp_retval xpc_initiate_send(short, int, void *); 67264d032baSDean Nelson extern enum xp_retval xpc_initiate_send_notify(short, int, void *, 67345d9ca49SDean Nelson xpc_notify_func, void *); 67464d032baSDean Nelson extern void xpc_initiate_received(short, int, void *); 67545d9ca49SDean Nelson extern void xpc_process_channel_activity(struct xpc_partition *); 67645d9ca49SDean Nelson extern void xpc_connected_callout(struct xpc_channel *); 67745d9ca49SDean Nelson extern void xpc_deliver_msg(struct xpc_channel *); 67845d9ca49SDean Nelson extern void xpc_disconnect_channel(const int, struct xpc_channel *, 67965c17b80SDean Nelson enum xp_retval, unsigned long *); 68065c17b80SDean Nelson extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval); 68165c17b80SDean Nelson extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval); 68245d9ca49SDean Nelson 68345d9ca49SDean Nelson static inline void 68445d9ca49SDean Nelson xpc_wakeup_channel_mgr(struct xpc_partition *part) 68545d9ca49SDean Nelson { 6862c2b94f9SDean Nelson if (atomic_inc_return(&part->channel_mgr_requests) == 1) 68745d9ca49SDean Nelson wake_up(&part->channel_mgr_wq); 68845d9ca49SDean Nelson } 68945d9ca49SDean Nelson 69045d9ca49SDean Nelson /* 69145d9ca49SDean Nelson * These next two inlines are used to keep us from tearing down a channel's 69245d9ca49SDean Nelson * msg queues while a thread may be referencing them. 69345d9ca49SDean Nelson */ 69445d9ca49SDean Nelson static inline void 69545d9ca49SDean Nelson xpc_msgqueue_ref(struct xpc_channel *ch) 69645d9ca49SDean Nelson { 69745d9ca49SDean Nelson atomic_inc(&ch->references); 69845d9ca49SDean Nelson } 69945d9ca49SDean Nelson 70045d9ca49SDean Nelson static inline void 70145d9ca49SDean Nelson xpc_msgqueue_deref(struct xpc_channel *ch) 70245d9ca49SDean Nelson { 70345d9ca49SDean Nelson s32 refs = atomic_dec_return(&ch->references); 70445d9ca49SDean Nelson 70545d9ca49SDean Nelson DBUG_ON(refs < 0); 7062c2b94f9SDean Nelson if (refs == 0) 70745d9ca49SDean Nelson xpc_wakeup_channel_mgr(&xpc_partitions[ch->partid]); 70845d9ca49SDean Nelson } 70945d9ca49SDean Nelson 71045d9ca49SDean Nelson #define XPC_DISCONNECT_CHANNEL(_ch, _reason, _irqflgs) \ 71145d9ca49SDean Nelson xpc_disconnect_channel(__LINE__, _ch, _reason, _irqflgs) 71245d9ca49SDean Nelson 71345d9ca49SDean Nelson /* 71445d9ca49SDean Nelson * These two inlines are used to keep us from tearing down a partition's 71545d9ca49SDean Nelson * setup infrastructure while a thread may be referencing it. 71645d9ca49SDean Nelson */ 71745d9ca49SDean Nelson static inline void 71845d9ca49SDean Nelson xpc_part_deref(struct xpc_partition *part) 71945d9ca49SDean Nelson { 72045d9ca49SDean Nelson s32 refs = atomic_dec_return(&part->references); 72145d9ca49SDean Nelson 72245d9ca49SDean Nelson DBUG_ON(refs < 0); 7232c2b94f9SDean Nelson if (refs == 0 && part->setup_state == XPC_P_WTEARDOWN) 72445d9ca49SDean Nelson wake_up(&part->teardown_wq); 72545d9ca49SDean Nelson } 72645d9ca49SDean Nelson 72745d9ca49SDean Nelson static inline int 72845d9ca49SDean Nelson xpc_part_ref(struct xpc_partition *part) 72945d9ca49SDean Nelson { 73045d9ca49SDean Nelson int setup; 73145d9ca49SDean Nelson 73245d9ca49SDean Nelson atomic_inc(&part->references); 73345d9ca49SDean Nelson setup = (part->setup_state == XPC_P_SETUP); 7342c2b94f9SDean Nelson if (!setup) 73545d9ca49SDean Nelson xpc_part_deref(part); 7362c2b94f9SDean Nelson 73745d9ca49SDean Nelson return setup; 73845d9ca49SDean Nelson } 73945d9ca49SDean Nelson 74045d9ca49SDean Nelson /* 74145d9ca49SDean Nelson * The following macro is to be used for the setting of the reason and 74245d9ca49SDean Nelson * reason_line fields in both the struct xpc_channel and struct xpc_partition 74345d9ca49SDean Nelson * structures. 74445d9ca49SDean Nelson */ 74545d9ca49SDean Nelson #define XPC_SET_REASON(_p, _reason, _line) \ 74645d9ca49SDean Nelson { \ 74745d9ca49SDean Nelson (_p)->reason = _reason; \ 74845d9ca49SDean Nelson (_p)->reason_line = _line; \ 74945d9ca49SDean Nelson } 75045d9ca49SDean Nelson 75145d9ca49SDean Nelson /* 75245d9ca49SDean Nelson * This next set of inlines are used to keep track of when a partition is 75345d9ca49SDean Nelson * potentially engaged in accessing memory belonging to another partition. 75445d9ca49SDean Nelson */ 75545d9ca49SDean Nelson 75645d9ca49SDean Nelson static inline void 75745d9ca49SDean Nelson xpc_mark_partition_engaged(struct xpc_partition *part) 75845d9ca49SDean Nelson { 75945d9ca49SDean Nelson unsigned long irq_flags; 76045d9ca49SDean Nelson AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 7614a3ad2ddSDean Nelson (XPC_ENGAGED_PARTITIONS_AMO * 7624a3ad2ddSDean Nelson sizeof(AMO_t))); 76345d9ca49SDean Nelson 76445d9ca49SDean Nelson local_irq_save(irq_flags); 76545d9ca49SDean Nelson 76645d9ca49SDean Nelson /* set bit corresponding to our partid in remote partition's AMO */ 76745d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, 76845d9ca49SDean Nelson (1UL << sn_partition_id)); 76945d9ca49SDean Nelson /* 77045d9ca49SDean Nelson * We must always use the nofault function regardless of whether we 77145d9ca49SDean Nelson * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 77245d9ca49SDean Nelson * didn't, we'd never know that the other partition is down and would 77345d9ca49SDean Nelson * keep sending IPIs and AMOs to it until the heartbeat times out. 77445d9ca49SDean Nelson */ 77545d9ca49SDean Nelson (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 7764a3ad2ddSDean Nelson variable), 7774a3ad2ddSDean Nelson xp_nofault_PIOR_target)); 77845d9ca49SDean Nelson 77945d9ca49SDean Nelson local_irq_restore(irq_flags); 78045d9ca49SDean Nelson } 78145d9ca49SDean Nelson 78245d9ca49SDean Nelson static inline void 78345d9ca49SDean Nelson xpc_mark_partition_disengaged(struct xpc_partition *part) 78445d9ca49SDean Nelson { 78545d9ca49SDean Nelson unsigned long irq_flags; 78645d9ca49SDean Nelson AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 7874a3ad2ddSDean Nelson (XPC_ENGAGED_PARTITIONS_AMO * 7884a3ad2ddSDean Nelson sizeof(AMO_t))); 78945d9ca49SDean Nelson 79045d9ca49SDean Nelson local_irq_save(irq_flags); 79145d9ca49SDean Nelson 79245d9ca49SDean Nelson /* clear bit corresponding to our partid in remote partition's AMO */ 79345d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 79445d9ca49SDean Nelson ~(1UL << sn_partition_id)); 79545d9ca49SDean Nelson /* 79645d9ca49SDean Nelson * We must always use the nofault function regardless of whether we 79745d9ca49SDean Nelson * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 79845d9ca49SDean Nelson * didn't, we'd never know that the other partition is down and would 79945d9ca49SDean Nelson * keep sending IPIs and AMOs to it until the heartbeat times out. 80045d9ca49SDean Nelson */ 80145d9ca49SDean Nelson (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 8024a3ad2ddSDean Nelson variable), 8034a3ad2ddSDean Nelson xp_nofault_PIOR_target)); 80445d9ca49SDean Nelson 80545d9ca49SDean Nelson local_irq_restore(irq_flags); 80645d9ca49SDean Nelson } 80745d9ca49SDean Nelson 80845d9ca49SDean Nelson static inline void 80945d9ca49SDean Nelson xpc_request_partition_disengage(struct xpc_partition *part) 81045d9ca49SDean Nelson { 81145d9ca49SDean Nelson unsigned long irq_flags; 81245d9ca49SDean Nelson AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 81345d9ca49SDean Nelson (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 81445d9ca49SDean Nelson 81545d9ca49SDean Nelson local_irq_save(irq_flags); 81645d9ca49SDean Nelson 81745d9ca49SDean Nelson /* set bit corresponding to our partid in remote partition's AMO */ 81845d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, 81945d9ca49SDean Nelson (1UL << sn_partition_id)); 82045d9ca49SDean Nelson /* 82145d9ca49SDean Nelson * We must always use the nofault function regardless of whether we 82245d9ca49SDean Nelson * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 82345d9ca49SDean Nelson * didn't, we'd never know that the other partition is down and would 82445d9ca49SDean Nelson * keep sending IPIs and AMOs to it until the heartbeat times out. 82545d9ca49SDean Nelson */ 82645d9ca49SDean Nelson (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 8274a3ad2ddSDean Nelson variable), 8284a3ad2ddSDean Nelson xp_nofault_PIOR_target)); 82945d9ca49SDean Nelson 83045d9ca49SDean Nelson local_irq_restore(irq_flags); 83145d9ca49SDean Nelson } 83245d9ca49SDean Nelson 83345d9ca49SDean Nelson static inline void 83445d9ca49SDean Nelson xpc_cancel_partition_disengage_request(struct xpc_partition *part) 83545d9ca49SDean Nelson { 83645d9ca49SDean Nelson unsigned long irq_flags; 83745d9ca49SDean Nelson AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa + 83845d9ca49SDean Nelson (XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t))); 83945d9ca49SDean Nelson 84045d9ca49SDean Nelson local_irq_save(irq_flags); 84145d9ca49SDean Nelson 84245d9ca49SDean Nelson /* clear bit corresponding to our partid in remote partition's AMO */ 84345d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 84445d9ca49SDean Nelson ~(1UL << sn_partition_id)); 84545d9ca49SDean Nelson /* 84645d9ca49SDean Nelson * We must always use the nofault function regardless of whether we 84745d9ca49SDean Nelson * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 84845d9ca49SDean Nelson * didn't, we'd never know that the other partition is down and would 84945d9ca49SDean Nelson * keep sending IPIs and AMOs to it until the heartbeat times out. 85045d9ca49SDean Nelson */ 85145d9ca49SDean Nelson (void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo-> 8524a3ad2ddSDean Nelson variable), 8534a3ad2ddSDean Nelson xp_nofault_PIOR_target)); 85445d9ca49SDean Nelson 85545d9ca49SDean Nelson local_irq_restore(irq_flags); 85645d9ca49SDean Nelson } 85745d9ca49SDean Nelson 85845d9ca49SDean Nelson static inline u64 85945d9ca49SDean Nelson xpc_partition_engaged(u64 partid_mask) 86045d9ca49SDean Nelson { 86145d9ca49SDean Nelson AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 86245d9ca49SDean Nelson 86345d9ca49SDean Nelson /* return our partition's AMO variable ANDed with partid_mask */ 86445d9ca49SDean Nelson return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & 86545d9ca49SDean Nelson partid_mask); 86645d9ca49SDean Nelson } 86745d9ca49SDean Nelson 86845d9ca49SDean Nelson static inline u64 86945d9ca49SDean Nelson xpc_partition_disengage_requested(u64 partid_mask) 87045d9ca49SDean Nelson { 87145d9ca49SDean Nelson AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 87245d9ca49SDean Nelson 87345d9ca49SDean Nelson /* return our partition's AMO variable ANDed with partid_mask */ 87445d9ca49SDean Nelson return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) & 87545d9ca49SDean Nelson partid_mask); 87645d9ca49SDean Nelson } 87745d9ca49SDean Nelson 87845d9ca49SDean Nelson static inline void 87945d9ca49SDean Nelson xpc_clear_partition_engaged(u64 partid_mask) 88045d9ca49SDean Nelson { 88145d9ca49SDean Nelson AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO; 88245d9ca49SDean Nelson 88345d9ca49SDean Nelson /* clear bit(s) based on partid_mask in our partition's AMO */ 88445d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 88545d9ca49SDean Nelson ~partid_mask); 88645d9ca49SDean Nelson } 88745d9ca49SDean Nelson 88845d9ca49SDean Nelson static inline void 88945d9ca49SDean Nelson xpc_clear_partition_disengage_request(u64 partid_mask) 89045d9ca49SDean Nelson { 89145d9ca49SDean Nelson AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO; 89245d9ca49SDean Nelson 89345d9ca49SDean Nelson /* clear bit(s) based on partid_mask in our partition's AMO */ 89445d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND, 89545d9ca49SDean Nelson ~partid_mask); 89645d9ca49SDean Nelson } 89745d9ca49SDean Nelson 89845d9ca49SDean Nelson /* 89945d9ca49SDean Nelson * The following set of macros and inlines are used for the sending and 90045d9ca49SDean Nelson * receiving of IPIs (also known as IRQs). There are two flavors of IPIs, 90145d9ca49SDean Nelson * one that is associated with partition activity (SGI_XPC_ACTIVATE) and 90245d9ca49SDean Nelson * the other that is associated with channel activity (SGI_XPC_NOTIFY). 90345d9ca49SDean Nelson */ 90445d9ca49SDean Nelson 90545d9ca49SDean Nelson static inline u64 90645d9ca49SDean Nelson xpc_IPI_receive(AMO_t *amo) 90745d9ca49SDean Nelson { 90845d9ca49SDean Nelson return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR); 90945d9ca49SDean Nelson } 91045d9ca49SDean Nelson 91165c17b80SDean Nelson static inline enum xp_retval 91245d9ca49SDean Nelson xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector) 91345d9ca49SDean Nelson { 91445d9ca49SDean Nelson int ret = 0; 91545d9ca49SDean Nelson unsigned long irq_flags; 91645d9ca49SDean Nelson 91745d9ca49SDean Nelson local_irq_save(irq_flags); 91845d9ca49SDean Nelson 91945d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag); 92045d9ca49SDean Nelson sn_send_IPI_phys(nasid, phys_cpuid, vector, 0); 92145d9ca49SDean Nelson 92245d9ca49SDean Nelson /* 92345d9ca49SDean Nelson * We must always use the nofault function regardless of whether we 92445d9ca49SDean Nelson * are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we 92545d9ca49SDean Nelson * didn't, we'd never know that the other partition is down and would 92645d9ca49SDean Nelson * keep sending IPIs and AMOs to it until the heartbeat times out. 92745d9ca49SDean Nelson */ 92845d9ca49SDean Nelson ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable), 92945d9ca49SDean Nelson xp_nofault_PIOR_target)); 93045d9ca49SDean Nelson 93145d9ca49SDean Nelson local_irq_restore(irq_flags); 93245d9ca49SDean Nelson 93365c17b80SDean Nelson return ((ret == 0) ? xpSuccess : xpPioReadError); 93445d9ca49SDean Nelson } 93545d9ca49SDean Nelson 93645d9ca49SDean Nelson /* 93745d9ca49SDean Nelson * IPIs associated with SGI_XPC_ACTIVATE IRQ. 93845d9ca49SDean Nelson */ 93945d9ca49SDean Nelson 94045d9ca49SDean Nelson /* 94145d9ca49SDean Nelson * Flag the appropriate AMO variable and send an IPI to the specified node. 94245d9ca49SDean Nelson */ 94345d9ca49SDean Nelson static inline void 94445d9ca49SDean Nelson xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid, 94545d9ca49SDean Nelson int to_phys_cpuid) 94645d9ca49SDean Nelson { 94745d9ca49SDean Nelson int w_index = XPC_NASID_W_INDEX(from_nasid); 94845d9ca49SDean Nelson int b_index = XPC_NASID_B_INDEX(from_nasid); 94945d9ca49SDean Nelson AMO_t *amos = (AMO_t *)__va(amos_page_pa + 95045d9ca49SDean Nelson (XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t))); 95145d9ca49SDean Nelson 95245d9ca49SDean Nelson (void)xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid, 95345d9ca49SDean Nelson to_phys_cpuid, SGI_XPC_ACTIVATE); 95445d9ca49SDean Nelson } 95545d9ca49SDean Nelson 95645d9ca49SDean Nelson static inline void 95745d9ca49SDean Nelson xpc_IPI_send_activate(struct xpc_vars *vars) 95845d9ca49SDean Nelson { 95945d9ca49SDean Nelson xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0), 96045d9ca49SDean Nelson vars->act_nasid, vars->act_phys_cpuid); 96145d9ca49SDean Nelson } 96245d9ca49SDean Nelson 96345d9ca49SDean Nelson static inline void 96445d9ca49SDean Nelson xpc_IPI_send_activated(struct xpc_partition *part) 96545d9ca49SDean Nelson { 96645d9ca49SDean Nelson xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 9674a3ad2ddSDean Nelson part->remote_act_nasid, 9684a3ad2ddSDean Nelson part->remote_act_phys_cpuid); 96945d9ca49SDean Nelson } 97045d9ca49SDean Nelson 97145d9ca49SDean Nelson static inline void 97245d9ca49SDean Nelson xpc_IPI_send_reactivate(struct xpc_partition *part) 97345d9ca49SDean Nelson { 97445d9ca49SDean Nelson xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid, 97545d9ca49SDean Nelson xpc_vars->act_nasid, xpc_vars->act_phys_cpuid); 97645d9ca49SDean Nelson } 97745d9ca49SDean Nelson 97845d9ca49SDean Nelson static inline void 97945d9ca49SDean Nelson xpc_IPI_send_disengage(struct xpc_partition *part) 98045d9ca49SDean Nelson { 98145d9ca49SDean Nelson xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0), 9824a3ad2ddSDean Nelson part->remote_act_nasid, 9834a3ad2ddSDean Nelson part->remote_act_phys_cpuid); 98445d9ca49SDean Nelson } 98545d9ca49SDean Nelson 98645d9ca49SDean Nelson /* 98745d9ca49SDean Nelson * IPIs associated with SGI_XPC_NOTIFY IRQ. 98845d9ca49SDean Nelson */ 98945d9ca49SDean Nelson 99045d9ca49SDean Nelson /* 99145d9ca49SDean Nelson * Send an IPI to the remote partition that is associated with the 99245d9ca49SDean Nelson * specified channel. 99345d9ca49SDean Nelson */ 99445d9ca49SDean Nelson #define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \ 99545d9ca49SDean Nelson xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f) 99645d9ca49SDean Nelson 99745d9ca49SDean Nelson static inline void 99845d9ca49SDean Nelson xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string, 99945d9ca49SDean Nelson unsigned long *irq_flags) 100045d9ca49SDean Nelson { 100145d9ca49SDean Nelson struct xpc_partition *part = &xpc_partitions[ch->partid]; 100265c17b80SDean Nelson enum xp_retval ret; 100345d9ca49SDean Nelson 100445d9ca49SDean Nelson if (likely(part->act_state != XPC_P_DEACTIVATING)) { 100545d9ca49SDean Nelson ret = xpc_IPI_send(part->remote_IPI_amo_va, 100645d9ca49SDean Nelson (u64)ipi_flag << (ch->number * 8), 100745d9ca49SDean Nelson part->remote_IPI_nasid, 10084a3ad2ddSDean Nelson part->remote_IPI_phys_cpuid, SGI_XPC_NOTIFY); 100945d9ca49SDean Nelson dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n", 101045d9ca49SDean Nelson ipi_flag_string, ch->partid, ch->number, ret); 101165c17b80SDean Nelson if (unlikely(ret != xpSuccess)) { 10122c2b94f9SDean Nelson if (irq_flags != NULL) 101345d9ca49SDean Nelson spin_unlock_irqrestore(&ch->lock, *irq_flags); 101445d9ca49SDean Nelson XPC_DEACTIVATE_PARTITION(part, ret); 10152c2b94f9SDean Nelson if (irq_flags != NULL) 101645d9ca49SDean Nelson spin_lock_irqsave(&ch->lock, *irq_flags); 101745d9ca49SDean Nelson } 101845d9ca49SDean Nelson } 101945d9ca49SDean Nelson } 102045d9ca49SDean Nelson 102145d9ca49SDean Nelson /* 102245d9ca49SDean Nelson * Make it look like the remote partition, which is associated with the 102345d9ca49SDean Nelson * specified channel, sent us an IPI. This faked IPI will be handled 102445d9ca49SDean Nelson * by xpc_dropped_IPI_check(). 102545d9ca49SDean Nelson */ 102645d9ca49SDean Nelson #define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \ 102745d9ca49SDean Nelson xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f) 102845d9ca49SDean Nelson 102945d9ca49SDean Nelson static inline void 103045d9ca49SDean Nelson xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag, 103145d9ca49SDean Nelson char *ipi_flag_string) 103245d9ca49SDean Nelson { 103345d9ca49SDean Nelson struct xpc_partition *part = &xpc_partitions[ch->partid]; 103445d9ca49SDean Nelson 103545d9ca49SDean Nelson FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable), 103645d9ca49SDean Nelson FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8))); 103745d9ca49SDean Nelson dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n", 103845d9ca49SDean Nelson ipi_flag_string, ch->partid, ch->number); 103945d9ca49SDean Nelson } 104045d9ca49SDean Nelson 104145d9ca49SDean Nelson /* 104245d9ca49SDean Nelson * The sending and receiving of IPIs includes the setting of an AMO variable 104345d9ca49SDean Nelson * to indicate the reason the IPI was sent. The 64-bit variable is divided 104445d9ca49SDean Nelson * up into eight bytes, ordered from right to left. Byte zero pertains to 104545d9ca49SDean Nelson * channel 0, byte one to channel 1, and so on. Each byte is described by 104645d9ca49SDean Nelson * the following IPI flags. 104745d9ca49SDean Nelson */ 104845d9ca49SDean Nelson 104945d9ca49SDean Nelson #define XPC_IPI_CLOSEREQUEST 0x01 105045d9ca49SDean Nelson #define XPC_IPI_CLOSEREPLY 0x02 105145d9ca49SDean Nelson #define XPC_IPI_OPENREQUEST 0x04 105245d9ca49SDean Nelson #define XPC_IPI_OPENREPLY 0x08 105345d9ca49SDean Nelson #define XPC_IPI_MSGREQUEST 0x10 105445d9ca49SDean Nelson 105545d9ca49SDean Nelson /* given an AMO variable and a channel#, get its associated IPI flags */ 105645d9ca49SDean Nelson #define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff)) 105745d9ca49SDean Nelson #define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8)) 105845d9ca49SDean Nelson 10592c2b94f9SDean Nelson #define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL) 10602c2b94f9SDean Nelson #define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL) 106145d9ca49SDean Nelson 106245d9ca49SDean Nelson static inline void 106345d9ca49SDean Nelson xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags) 106445d9ca49SDean Nelson { 106545d9ca49SDean Nelson struct xpc_openclose_args *args = ch->local_openclose_args; 106645d9ca49SDean Nelson 106745d9ca49SDean Nelson args->reason = ch->reason; 106845d9ca49SDean Nelson 106945d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags); 107045d9ca49SDean Nelson } 107145d9ca49SDean Nelson 107245d9ca49SDean Nelson static inline void 107345d9ca49SDean Nelson xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags) 107445d9ca49SDean Nelson { 107545d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags); 107645d9ca49SDean Nelson } 107745d9ca49SDean Nelson 107845d9ca49SDean Nelson static inline void 107945d9ca49SDean Nelson xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags) 108045d9ca49SDean Nelson { 108145d9ca49SDean Nelson struct xpc_openclose_args *args = ch->local_openclose_args; 108245d9ca49SDean Nelson 108345d9ca49SDean Nelson args->msg_size = ch->msg_size; 108445d9ca49SDean Nelson args->local_nentries = ch->local_nentries; 108545d9ca49SDean Nelson 108645d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags); 108745d9ca49SDean Nelson } 108845d9ca49SDean Nelson 108945d9ca49SDean Nelson static inline void 109045d9ca49SDean Nelson xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags) 109145d9ca49SDean Nelson { 109245d9ca49SDean Nelson struct xpc_openclose_args *args = ch->local_openclose_args; 109345d9ca49SDean Nelson 109445d9ca49SDean Nelson args->remote_nentries = ch->remote_nentries; 109545d9ca49SDean Nelson args->local_nentries = ch->local_nentries; 109645d9ca49SDean Nelson args->local_msgqueue_pa = __pa(ch->local_msgqueue); 109745d9ca49SDean Nelson 109845d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags); 109945d9ca49SDean Nelson } 110045d9ca49SDean Nelson 110145d9ca49SDean Nelson static inline void 110245d9ca49SDean Nelson xpc_IPI_send_msgrequest(struct xpc_channel *ch) 110345d9ca49SDean Nelson { 110445d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL); 110545d9ca49SDean Nelson } 110645d9ca49SDean Nelson 110745d9ca49SDean Nelson static inline void 110845d9ca49SDean Nelson xpc_IPI_send_local_msgrequest(struct xpc_channel *ch) 110945d9ca49SDean Nelson { 111045d9ca49SDean Nelson XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST); 111145d9ca49SDean Nelson } 111245d9ca49SDean Nelson 111345d9ca49SDean Nelson /* 1114bc63d387SDean Nelson >>> this block comment needs to be moved and re-written. 111545d9ca49SDean Nelson * Memory for XPC's AMO variables is allocated by the MSPEC driver. These 111645d9ca49SDean Nelson * pages are located in the lowest granule. The lowest granule uses 4k pages 111745d9ca49SDean Nelson * for cached references and an alternate TLB handler to never provide a 111845d9ca49SDean Nelson * cacheable mapping for the entire region. This will prevent speculative 111945d9ca49SDean Nelson * reading of cached copies of our lines from being issued which will cause 112045d9ca49SDean Nelson * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64 1121bc63d387SDean Nelson * AMO variables (based on xp_max_npartitions) for message notification and an 112245d9ca49SDean Nelson * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition 112345d9ca49SDean Nelson * activation and 2 AMO variables for partition deactivation. 112445d9ca49SDean Nelson */ 112545d9ca49SDean Nelson static inline AMO_t * 112645d9ca49SDean Nelson xpc_IPI_init(int index) 112745d9ca49SDean Nelson { 112845d9ca49SDean Nelson AMO_t *amo = xpc_vars->amos_page + index; 112945d9ca49SDean Nelson 113045d9ca49SDean Nelson (void)xpc_IPI_receive(amo); /* clear AMO variable */ 113145d9ca49SDean Nelson return amo; 113245d9ca49SDean Nelson } 113345d9ca49SDean Nelson 113445d9ca49SDean Nelson /* 113545d9ca49SDean Nelson * Check to see if there is any channel activity to/from the specified 113645d9ca49SDean Nelson * partition. 113745d9ca49SDean Nelson */ 113845d9ca49SDean Nelson static inline void 113945d9ca49SDean Nelson xpc_check_for_channel_activity(struct xpc_partition *part) 114045d9ca49SDean Nelson { 114145d9ca49SDean Nelson u64 IPI_amo; 114245d9ca49SDean Nelson unsigned long irq_flags; 114345d9ca49SDean Nelson 114445d9ca49SDean Nelson IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va); 11452c2b94f9SDean Nelson if (IPI_amo == 0) 114645d9ca49SDean Nelson return; 114745d9ca49SDean Nelson 114845d9ca49SDean Nelson spin_lock_irqsave(&part->IPI_lock, irq_flags); 114945d9ca49SDean Nelson part->local_IPI_amo |= IPI_amo; 115045d9ca49SDean Nelson spin_unlock_irqrestore(&part->IPI_lock, irq_flags); 115145d9ca49SDean Nelson 115245d9ca49SDean Nelson dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n", 115345d9ca49SDean Nelson XPC_PARTID(part), IPI_amo); 115445d9ca49SDean Nelson 115545d9ca49SDean Nelson xpc_wakeup_channel_mgr(part); 115645d9ca49SDean Nelson } 115745d9ca49SDean Nelson 115845d9ca49SDean Nelson #endif /* _DRIVERS_MISC_SGIXP_XPC_H */ 1159