1 files changed, 107 insertions, 33 deletions

diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h
index 4c26181defff..619208d61862 100644
--- a/drivers/misc/sgi-xp/xpc.h
+++ b/drivers/misc/sgi-xp/xpc.h
@@ -181,8 +181,8 @@ struct xpc_vars_part_sn2 {
                                   xpc_nasid_mask_nlongs))
 
 /*
- * The activate_mq is used to send/receive messages that affect XPC's heartbeat,
- * partition active state, and channel state. This is UV only.
+ * The activate_mq is used to send/receive GRU messages that affect XPC's
+ * heartbeat, partition active state, and channel state. This is UV only.
  */
 struct xpc_activate_mq_msghdr_uv {
         short partid;           /* sender's partid */
@@ -209,45 +209,45 @@ struct xpc_activate_mq_msghdr_uv {
 #define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV          11
 
 struct xpc_activate_mq_msg_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
 };
 
 struct xpc_activate_mq_msg_heartbeat_req_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         u64 heartbeat;
 };
 
 struct xpc_activate_mq_msg_activate_req_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         unsigned long rp_gpa;
         unsigned long activate_mq_gpa;
 };
 
 struct xpc_activate_mq_msg_deactivate_req_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         enum xp_retval reason;
 };
 
 struct xpc_activate_mq_msg_chctl_closerequest_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         short ch_number;
         enum xp_retval reason;
 };
 
 struct xpc_activate_mq_msg_chctl_closereply_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         short ch_number;
 };
 
 struct xpc_activate_mq_msg_chctl_openrequest_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         short ch_number;
-        short msg_size;         /* size of notify_mq's messages */
+        short entry_size;       /* size of notify_mq's GRU messages */
         short local_nentries;   /* ??? Is this needed? What is? */
 };
 
 struct xpc_activate_mq_msg_chctl_openreply_uv {
-        struct xpc_activate_mq_msghdr_uv header;
+        struct xpc_activate_mq_msghdr_uv hdr;
         short ch_number;
         short remote_nentries;  /* ??? Is this needed? What is? */
         short local_nentries;   /* ??? Is this needed? What is? */
@@ -284,7 +284,7 @@ struct xpc_gp_sn2 {
  */
 struct xpc_openclose_args {
         u16 reason;             /* reason why channel is closing */
-        u16 msg_size;           /* sizeof each message entry */
+        u16 entry_size;         /* sizeof each message entry */
         u16 remote_nentries;    /* #of message entries in remote msg queue */
         u16 local_nentries;     /* #of message entries in local msg queue */
         unsigned long local_msgqueue_pa; /* phys addr of local message queue */
@@ -294,22 +294,79 @@ struct xpc_openclose_args {
               L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \
               XPC_MAX_NCHANNELS)
 
-/* struct xpc_msg flags */
 
-#define XPC_M_DONE              0x01    /* msg has been received/consumed */
-#define XPC_M_READY             0x02    /* msg is ready to be sent */
-#define XPC_M_INTERRUPT         0x04    /* send interrupt when msg consumed */
+/*
+ * Structures to define a fifo singly-linked list.
+ */
+
+struct xpc_fifo_entry_uv {
+        struct xpc_fifo_entry_uv *next;
+};
+
+struct xpc_fifo_head_uv {
+        struct xpc_fifo_entry_uv *first;
+        struct xpc_fifo_entry_uv *last;
+        spinlock_t lock;
+        int n_entries;
+};
+
+/*
+ * Define a sn2 styled message.
+ *
+ * A user-defined message resides in the payload area. The max size of the
+ * payload is defined by the user via xpc_connect().
+ *
+ * The size of a message entry (within a message queue) must be a 128-byte
+ * cacheline sized multiple in order to facilitate the BTE transfer of messages
+ * from one message queue to another.
+ */
+struct xpc_msg_sn2 {
+        u8 flags;               /* FOR XPC INTERNAL USE ONLY */
+        u8 reserved[7];         /* FOR XPC INTERNAL USE ONLY */
+        s64 number;             /* FOR XPC INTERNAL USE ONLY */
+
+        u64 payload;            /* user defined portion of message */
+};
+
+/* struct xpc_msg_sn2 flags */
+
+#define XPC_M_SN2_DONE          0x01    /* msg has been received/consumed */
+#define XPC_M_SN2_READY         0x02    /* msg is ready to be sent */
+#define XPC_M_SN2_INTERRUPT     0x04    /* send interrupt when msg consumed */
+
+/*
+ * The format of a uv XPC notify_mq GRU message is as follows:
+ *
+ * A user-defined message resides in the payload area. The max size of the
+ * payload is defined by the user via xpc_connect().
+ *
+ * The size of a message (payload and header) sent via the GRU must be either 1
+ * or 2 GRU_CACHE_LINE_BYTES in length.
+ */
 
-#define XPC_MSG_ADDRESS(_payload) \
-                ((struct xpc_msg *)((u8 *)(_payload) - XPC_MSG_PAYLOAD_OFFSET))
+struct xpc_notify_mq_msghdr_uv {
+        union {
+                unsigned int gru_msg_hdr;       /* FOR GRU INTERNAL USE ONLY */
+                struct xpc_fifo_entry_uv next;  /* FOR XPC INTERNAL USE ONLY */
+        } u;
+        short partid;           /* FOR XPC INTERNAL USE ONLY */
+        u8 ch_number;           /* FOR XPC INTERNAL USE ONLY */
+        u8 size;                /* FOR XPC INTERNAL USE ONLY */
+        unsigned int msg_slot_number;   /* FOR XPC INTERNAL USE ONLY */
+};
+
+struct xpc_notify_mq_msg_uv {
+        struct xpc_notify_mq_msghdr_uv hdr;
+        unsigned long payload;
+};
 
 /*
- * Defines notify entry.
+ * Define sn2's notify entry.
  *
  * This is used to notify a message's sender that their message was received
  * and consumed by the intended recipient.
  */
-struct xpc_notify {
+struct xpc_notify_sn2 {
         u8 type;                /* type of notification */
 
         /* the following two fields are only used if type == XPC_N_CALL */
@@ -317,9 +374,20 @@ struct xpc_notify {
         void *key;              /* pointer to user's key */
 };
 
-/* struct xpc_notify type of notification */
+/* struct xpc_notify_sn2 type of notification */
 
-#define XPC_N_CALL              0x01    /* notify function provided by user */
+#define XPC_N_CALL      0x01    /* notify function provided by user */
+
+/*
+ * Define uv's version of the notify entry. It additionally is used to allocate
+ * a msg slot on the remote partition into which is copied a sent message.
+ */
+struct xpc_send_msg_slot_uv {
+        struct xpc_fifo_entry_uv next;
+        unsigned int msg_slot_number;
+        xpc_notify_func func;   /* user's notify function */
+        void *key;              /* pointer to user's key */
+};
 
 /*
  * Define the structure that manages all the stuff required by a channel. In
@@ -409,14 +477,14 @@ struct xpc_channel_sn2 {
                                              /* opening or closing of channel */
 
         void *local_msgqueue_base;      /* base address of kmalloc'd space */
-        struct xpc_msg *local_msgqueue; /* local message queue */
+        struct xpc_msg_sn2 *local_msgqueue;     /* local message queue */
         void *remote_msgqueue_base;     /* base address of kmalloc'd space */
-        struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */
-                                         /* local message queue */
+        struct xpc_msg_sn2 *remote_msgqueue; /* cached copy of remote */
+                                           /* partition's local message queue */
         unsigned long remote_msgqueue_pa; /* phys addr of remote partition's */
                                           /* local message queue */
 
-        struct xpc_notify *notify_queue;    /* notify queue for messages sent */
+        struct xpc_notify_sn2 *notify_queue;/* notify queue for messages sent */
 
         /* various flavors of local and remote Get/Put values */
 
@@ -432,6 +500,12 @@ struct xpc_channel_sn2 {
 struct xpc_channel_uv {
         unsigned long remote_notify_mq_gpa;     /* gru phys address of remote */
                                                 /* partition's notify mq */
+
+        struct xpc_send_msg_slot_uv *send_msg_slots;
+        struct xpc_notify_mq_msg_uv *recv_msg_slots;
+
+        struct xpc_fifo_head_uv msg_slot_free_list;
+        struct xpc_fifo_head_uv recv_msg_list;  /* deliverable payloads */
 };
 
 struct xpc_channel {
@@ -444,7 +518,7 @@ struct xpc_channel {
 
         u16 number;             /* channel # */
 
-        u16 msg_size;           /* sizeof each msg entry */
+        u16 entry_size;         /* sizeof each msg entry */
         u16 local_nentries;     /* #of msg entries in local msg queue */
         u16 remote_nentries;    /* #of msg entries in remote msg queue */
 
@@ -733,8 +807,8 @@ extern enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *);
 extern void (*xpc_teardown_msg_structures) (struct xpc_channel *);
 extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *);
 extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int);
-extern int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *);
-extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *);
+extern int (*xpc_n_of_deliverable_payloads) (struct xpc_channel *);
+extern void *(*xpc_get_deliverable_payload) (struct xpc_channel *);
 extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *,
                                                  unsigned long, int);
 extern void (*xpc_request_partition_reactivation) (struct xpc_partition *);
@@ -762,9 +836,9 @@ extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *);
 extern void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *,
                                             unsigned long);
 
-extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, u32, void *, u16,
-                                       u8, xpc_notify_func, void *);
-extern void (*xpc_received_msg) (struct xpc_channel *, struct xpc_msg *);
+extern enum xp_retval (*xpc_send_payload) (struct xpc_channel *, u32, void *,
+                                           u16, u8, xpc_notify_func, void *);
+extern void (*xpc_received_payload) (struct xpc_channel *, void *);
 
 /* found in xpc_sn2.c */
 extern int xpc_init_sn2(void);
@@ -805,7 +879,7 @@ extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
 extern void xpc_initiate_received(short, int, void *);
 extern void xpc_process_sent_chctl_flags(struct xpc_partition *);
 extern void xpc_connected_callout(struct xpc_channel *);
-extern void xpc_deliver_msg(struct xpc_channel *);
+extern void xpc_deliver_payload(struct xpc_channel *);
 extern void xpc_disconnect_channel(const int, struct xpc_channel *,
                                    enum xp_retval, unsigned long *);
 extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);