sgi-xp: isolate allocation of XPC's msgqueues to sn2 only

Move the allocation of XPC's msgqueues to xpc_sn2.c.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 204 insertions, 203 deletions

diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h
index da2680892df..defd0888118 100644
--- a/drivers/misc/sgi-xp/xpc.h
+++ b/drivers/misc/sgi-xp/xpc.h
@@ -666,6 +666,8 @@ extern void (*xpc_online_heartbeat) (void);
 extern void (*xpc_check_remote_hb) (void);
 extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
 extern u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *);
+extern enum xp_retval (*xpc_allocate_msgqueues) (struct xpc_channel *);
+extern void (*xpc_free_msgqueues) (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 *);
@@ -728,7 +730,6 @@ extern void xpc_deactivate_partition(const int, struct xpc_partition *,
 extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
 
 /* found in xpc_channel.c */
-extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
 extern void xpc_initiate_connect(int);
 extern void xpc_initiate_disconnect(int);
 extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *);
diff --git a/drivers/misc/sgi-xp/xpc_channel.c b/drivers/misc/sgi-xp/xpc_channel.c
index 0d3c153d1d0..1c73423665b 100644
--- a/drivers/misc/sgi-xp/xpc_channel.c
+++ b/drivers/misc/sgi-xp/xpc_channel.c
@@ -25,145 +25,6 @@
 #include "xpc.h"
 
 /*
- * Guarantee that the kzalloc'd memory is cacheline aligned.
- */
-void *
-xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
-{
-        /* see if kzalloc will give us cachline aligned memory by default */
-        *base = kzalloc(size, flags);
-        if (*base == NULL)
-                return NULL;
-
-        if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
-                return *base;
-
-        kfree(*base);
-
-        /* nope, we'll have to do it ourselves */
-        *base = kzalloc(size + L1_CACHE_BYTES, flags);
-        if (*base == NULL)
-                return NULL;
-
-        return (void *)L1_CACHE_ALIGN((u64)*base);
-}
-
-/*
- * Allocate the local message queue and the notify queue.
- */
-static enum xp_retval
-xpc_allocate_local_msgqueue(struct xpc_channel *ch)
-{
-        unsigned long irq_flags;
-        int nentries;
-        size_t nbytes;
-
-        for (nentries = ch->local_nentries; nentries > 0; nentries--) {
-
-                nbytes = nentries * ch->msg_size;
-                ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
-                                                                   GFP_KERNEL,
-                                                      &ch->local_msgqueue_base);
-                if (ch->local_msgqueue == NULL)
-                        continue;
-
-                nbytes = nentries * sizeof(struct xpc_notify);
-                ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
-                if (ch->notify_queue == NULL) {
-                        kfree(ch->local_msgqueue_base);
-                        ch->local_msgqueue = NULL;
-                        continue;
-                }
-
-                spin_lock_irqsave(&ch->lock, irq_flags);
-                if (nentries < ch->local_nentries) {
-                        dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
-                                "partid=%d, channel=%d\n", nentries,
-                                ch->local_nentries, ch->partid, ch->number);
-
-                        ch->local_nentries = nentries;
-                }
-                spin_unlock_irqrestore(&ch->lock, irq_flags);
-                return xpSuccess;
-        }
-
-        dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
-                "queue, partid=%d, channel=%d\n", ch->partid, ch->number);
-        return xpNoMemory;
-}
-
-/*
- * Allocate the cached remote message queue.
- */
-static enum xp_retval
-xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
-{
-        unsigned long irq_flags;
-        int nentries;
-        size_t nbytes;
-
-        DBUG_ON(ch->remote_nentries <= 0);
-
-        for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
-
-                nbytes = nentries * ch->msg_size;
-                ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
-                                                                    GFP_KERNEL,
-                                                     &ch->remote_msgqueue_base);
-                if (ch->remote_msgqueue == NULL)
-                        continue;
-
-                spin_lock_irqsave(&ch->lock, irq_flags);
-                if (nentries < ch->remote_nentries) {
-                        dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
-                                "partid=%d, channel=%d\n", nentries,
-                                ch->remote_nentries, ch->partid, ch->number);
-
-                        ch->remote_nentries = nentries;
-                }
-                spin_unlock_irqrestore(&ch->lock, irq_flags);
-                return xpSuccess;
-        }
-
-        dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
-                "partid=%d, channel=%d\n", ch->partid, ch->number);
-        return xpNoMemory;
-}
-
-/*
- * Allocate message queues and other stuff associated with a channel.
- *
- * Note: Assumes all of the channel sizes are filled in.
- */
-static enum xp_retval
-xpc_allocate_msgqueues(struct xpc_channel *ch)
-{
-        unsigned long irq_flags;
-        enum xp_retval ret;
-
-        DBUG_ON(ch->flags & XPC_C_SETUP);
-
-        ret = xpc_allocate_local_msgqueue(ch);
-        if (ret != xpSuccess)
-                return ret;
-
-        ret = xpc_allocate_remote_msgqueue(ch);
-        if (ret != xpSuccess) {
-                kfree(ch->local_msgqueue_base);
-                ch->local_msgqueue = NULL;
-                kfree(ch->notify_queue);
-                ch->notify_queue = NULL;
-                return ret;
-        }
-
-        spin_lock_irqsave(&ch->lock, irq_flags);
-        ch->flags |= XPC_C_SETUP;
-        spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-        return xpSuccess;
-}
-
-/*
  * Process a connect message from a remote partition.
  *
  * Note: xpc_process_connect() is expecting to be called with the
@@ -191,10 +52,11 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
                 if (ret != xpSuccess)
                         XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
 
+                ch->flags |= XPC_C_SETUP;
+
                 if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING))
                         return;
 
-                DBUG_ON(!(ch->flags & XPC_C_SETUP));
                 DBUG_ON(ch->local_msgqueue == NULL);
                 DBUG_ON(ch->remote_msgqueue == NULL);
         }
@@ -220,55 +82,6 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
 }
 
 /*
- * Free up message queues and other stuff that were allocated for the specified
- * channel.
- *
- * Note: ch->reason and ch->reason_line are left set for debugging purposes,
- * they're cleared when XPC_C_DISCONNECTED is cleared.
- */
-static void
-xpc_free_msgqueues(struct xpc_channel *ch)
-{
-        struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
-
-        DBUG_ON(!spin_is_locked(&ch->lock));
-        DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
-
-        ch->remote_msgqueue_pa = 0;
-        ch->func = NULL;
-        ch->key = NULL;
-        ch->msg_size = 0;
-        ch->local_nentries = 0;
-        ch->remote_nentries = 0;
-        ch->kthreads_assigned_limit = 0;
-        ch->kthreads_idle_limit = 0;
-
-        ch_sn2->local_GP->get = 0;
-        ch_sn2->local_GP->put = 0;
-        ch_sn2->remote_GP.get = 0;
-        ch_sn2->remote_GP.put = 0;
-        ch_sn2->w_local_GP.get = 0;
-        ch_sn2->w_local_GP.put = 0;
-        ch_sn2->w_remote_GP.get = 0;
-        ch_sn2->w_remote_GP.put = 0;
-        ch_sn2->next_msg_to_pull = 0;
-
-        if (ch->flags & XPC_C_SETUP) {
-                ch->flags &= ~XPC_C_SETUP;
-
-                dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
-                        ch->flags, ch->partid, ch->number);
-
-                kfree(ch->local_msgqueue_base);
-                ch->local_msgqueue = NULL;
-                kfree(ch->remote_msgqueue_base);
-                ch->remote_msgqueue = NULL;
-                kfree(ch->notify_queue);
-                ch->notify_queue = NULL;
-        }
-}
-
-/*
  * spin_lock_irqsave() is expected to be held on entry.
  */
 static void
@@ -331,7 +144,11 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
         /* it's now safe to free the channel's message queues */
         xpc_free_msgqueues(ch);
 
-        /* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */
+        /*
+         * Mark the channel disconnected and clear all other flags, including
+         * XPC_C_SETUP (because of call to xpc_free_msgqueues()) but not
+         * including XPC_C_WDISCONNECT (if it was set).
+         */
         ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
 
         atomic_dec(&part->nchannels_active);
diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
index 2934b447300..b5f3c5e59db 100644
--- a/drivers/misc/sgi-xp/xpc_main.c
+++ b/drivers/misc/sgi-xp/xpc_main.c
@@ -186,6 +186,8 @@ void (*xpc_check_remote_hb) (void);
 enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
 void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch);
 u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part);
+enum xp_retval (*xpc_allocate_msgqueues) (struct xpc_channel *ch);
+void (*xpc_free_msgqueues) (struct xpc_channel *ch);
 void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number);
 int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *ch);
 struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch);
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 01dd40ec2a8..e5dc8c44c6f 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -1049,6 +1049,30 @@ xpc_process_activate_IRQ_rcvd_sn2(int n_IRQs_expected)
 }
 
 /*
+ * Guarantee that the kzalloc'd memory is cacheline aligned.
+ */
+static void *
+xpc_kzalloc_cacheline_aligned_sn2(size_t size, gfp_t flags, void **base)
+{
+        /* see if kzalloc will give us cachline aligned memory by default */
+        *base = kzalloc(size, flags);
+        if (*base == NULL)
+                return NULL;
+
+        if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
+                return *base;
+
+        kfree(*base);
+
+        /* nope, we'll have to do it ourselves */
+        *base = kzalloc(size + L1_CACHE_BYTES, flags);
+        if (*base == NULL)
+                return NULL;
+
+        return (void *)L1_CACHE_ALIGN((u64)*base);
+}
+
+/*
  * Setup the infrastructure necessary to support XPartition Communication
  * between the specified remote partition and the local one.
  */
@@ -1078,10 +1102,9 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
 
         /* allocate all the required GET/PUT values */
 
-        part_sn2->local_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
-                                                            GFP_KERNEL,
-                                                            &part_sn2->
-                                                            local_GPs_base);
+        part_sn2->local_GPs =
+            xpc_kzalloc_cacheline_aligned_sn2(XPC_GP_SIZE, GFP_KERNEL,
+                                              &part_sn2->local_GPs_base);
         if (part_sn2->local_GPs == NULL) {
                 dev_err(xpc_chan, "can't get memory for local get/put "
                         "values\n");
@@ -1089,10 +1112,9 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
                 goto out_1;
         }
 
-        part_sn2->remote_GPs = xpc_kzalloc_cacheline_aligned(XPC_GP_SIZE,
-                                                             GFP_KERNEL,
-                                                             &part_sn2->
-                                                             remote_GPs_base);
+        part_sn2->remote_GPs =
+            xpc_kzalloc_cacheline_aligned_sn2(XPC_GP_SIZE, GFP_KERNEL,
+                                              &part_sn2->remote_GPs_base);
         if (part_sn2->remote_GPs == NULL) {
                 dev_err(xpc_chan, "can't get memory for remote get/put "
                         "values\n");
@@ -1105,8 +1127,9 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
         /* allocate all the required open and close args */
 
         part->local_openclose_args =
-            xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
-                                          &part->local_openclose_args_base);
+            xpc_kzalloc_cacheline_aligned_sn2(XPC_OPENCLOSE_ARGS_SIZE,
+                                              GFP_KERNEL,
+                                              &part->local_openclose_args_base);
         if (part->local_openclose_args == NULL) {
                 dev_err(xpc_chan, "can't get memory for local connect args\n");
                 retval = xpNoMemory;
@@ -1114,8 +1137,9 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
         }
 
         part->remote_openclose_args =
-            xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE, GFP_KERNEL,
-                                          &part->remote_openclose_args_base);
+            xpc_kzalloc_cacheline_aligned_sn2(XPC_OPENCLOSE_ARGS_SIZE,
+                                              GFP_KERNEL,
+                                             &part->remote_openclose_args_base);
         if (part->remote_openclose_args == NULL) {
                 dev_err(xpc_chan, "can't get memory for remote connect args\n");
                 retval = xpNoMemory;
@@ -1528,6 +1552,161 @@ xpc_get_chctl_all_flags_sn2(struct xpc_partition *part)
 }
 
 /*
+ * Allocate the local message queue and the notify queue.
+ */
+static enum xp_retval
+xpc_allocate_local_msgqueue_sn2(struct xpc_channel *ch)
+{
+        unsigned long irq_flags;
+        int nentries;
+        size_t nbytes;
+
+        for (nentries = ch->local_nentries; nentries > 0; nentries--) {
+
+                nbytes = nentries * ch->msg_size;
+                ch->local_msgqueue =
+                    xpc_kzalloc_cacheline_aligned_sn2(nbytes, GFP_KERNEL,
+                                                      &ch->local_msgqueue_base);
+                if (ch->local_msgqueue == NULL)
+                        continue;
+
+                nbytes = nentries * sizeof(struct xpc_notify);
+                ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
+                if (ch->notify_queue == NULL) {
+                        kfree(ch->local_msgqueue_base);
+                        ch->local_msgqueue = NULL;
+                        continue;
+                }
+
+                spin_lock_irqsave(&ch->lock, irq_flags);
+                if (nentries < ch->local_nentries) {
+                        dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
+                                "partid=%d, channel=%d\n", nentries,
+                                ch->local_nentries, ch->partid, ch->number);
+
+                        ch->local_nentries = nentries;
+                }
+                spin_unlock_irqrestore(&ch->lock, irq_flags);
+                return xpSuccess;
+        }
+
+        dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
+                "queue, partid=%d, channel=%d\n", ch->partid, ch->number);
+        return xpNoMemory;
+}
+
+/*
+ * Allocate the cached remote message queue.
+ */
+static enum xp_retval
+xpc_allocate_remote_msgqueue_sn2(struct xpc_channel *ch)
+{
+        unsigned long irq_flags;
+        int nentries;
+        size_t nbytes;
+
+        DBUG_ON(ch->remote_nentries <= 0);
+
+        for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
+
+                nbytes = nentries * ch->msg_size;
+                ch->remote_msgqueue =
+                    xpc_kzalloc_cacheline_aligned_sn2(nbytes, GFP_KERNEL,
+                                                     &ch->remote_msgqueue_base);
+                if (ch->remote_msgqueue == NULL)
+                        continue;
+
+                spin_lock_irqsave(&ch->lock, irq_flags);
+                if (nentries < ch->remote_nentries) {
+                        dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
+                                "partid=%d, channel=%d\n", nentries,
+                                ch->remote_nentries, ch->partid, ch->number);
+
+                        ch->remote_nentries = nentries;
+                }
+                spin_unlock_irqrestore(&ch->lock, irq_flags);
+                return xpSuccess;
+        }
+
+        dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
+                "partid=%d, channel=%d\n", ch->partid, ch->number);
+        return xpNoMemory;
+}
+
+/*
+ * Allocate message queues and other stuff associated with a channel.
+ *
+ * Note: Assumes all of the channel sizes are filled in.
+ */
+static enum xp_retval
+xpc_allocate_msgqueues_sn2(struct xpc_channel *ch)
+{
+        enum xp_retval ret;
+
+        DBUG_ON(ch->flags & XPC_C_SETUP);
+
+        ret = xpc_allocate_local_msgqueue_sn2(ch);
+        if (ret == xpSuccess) {
+
+                ret = xpc_allocate_remote_msgqueue_sn2(ch);
+                if (ret != xpSuccess) {
+                        kfree(ch->local_msgqueue_base);
+                        ch->local_msgqueue = NULL;
+                        kfree(ch->notify_queue);
+                        ch->notify_queue = NULL;
+                }
+        }
+        return ret;
+}
+
+/*
+ * Free up message queues and other stuff that were allocated for the specified
+ * channel.
+ *
+ * Note: ch->reason and ch->reason_line are left set for debugging purposes,
+ * they're cleared when XPC_C_DISCONNECTED is cleared.
+ */
+static void
+xpc_free_msgqueues_sn2(struct xpc_channel *ch)
+{
+        struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
+
+        DBUG_ON(!spin_is_locked(&ch->lock));
+        DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
+
+        ch->remote_msgqueue_pa = 0;
+        ch->func = NULL;
+        ch->key = NULL;
+        ch->msg_size = 0;
+        ch->local_nentries = 0;
+        ch->remote_nentries = 0;
+        ch->kthreads_assigned_limit = 0;
+        ch->kthreads_idle_limit = 0;
+
+        ch_sn2->local_GP->get = 0;
+        ch_sn2->local_GP->put = 0;
+        ch_sn2->remote_GP.get = 0;
+        ch_sn2->remote_GP.put = 0;
+        ch_sn2->w_local_GP.get = 0;
+        ch_sn2->w_local_GP.put = 0;
+        ch_sn2->w_remote_GP.get = 0;
+        ch_sn2->w_remote_GP.put = 0;
+        ch_sn2->next_msg_to_pull = 0;
+
+        if (ch->flags & XPC_C_SETUP) {
+                dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
+                        ch->flags, ch->partid, ch->number);
+
+                kfree(ch->local_msgqueue_base);
+                ch->local_msgqueue = NULL;
+                kfree(ch->remote_msgqueue_base);
+                ch->remote_msgqueue = NULL;
+                kfree(ch->notify_queue);
+                ch->notify_queue = NULL;
+        }
+}
+
+/*
  * Notify those who wanted to be notified upon delivery of their message.
  */
 static void
@@ -2177,6 +2356,8 @@ xpc_init_sn2(void)
         xpc_teardown_infrastructure = xpc_teardown_infrastructure_sn2;
         xpc_make_first_contact = xpc_make_first_contact_sn2;
         xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_sn2;
+        xpc_allocate_msgqueues = xpc_allocate_msgqueues_sn2;
+        xpc_free_msgqueues = xpc_free_msgqueues_sn2;
         xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_sn2;
         xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_sn2;
         xpc_n_of_deliverable_msgs = xpc_n_of_deliverable_msgs_sn2;