[S390] Explicitly code allocpercpu calls in iucv

The iucv is the only user of the various functions that are used to bring
parts of cpus up and down. Its the only allocpercpu user that will do
I/O on per cpu objects (which is difficult to do with virtually mapped memory).
And its the only use of allocpercpu where a GFP_DMA allocation is done.

Remove the allocpercpu calls from iucv and code the allocation and freeing
manually. After this patch it is possible to remove a large part of
the allocpercpu API.
Signed-off-by: NChristoph Lameter <clameter@sgi.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

net/iucv/iucv.c

@@ -97,7 +97,7 @@ struct iucv_irq_list {
 	struct iucv_irq_data data;
 };
 
-static struct iucv_irq_data *iucv_irq_data;
+static struct iucv_irq_data *iucv_irq_data[NR_CPUS];
 static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
 static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
 
@@ -277,7 +277,7 @@ union iucv_param {
 /*
  * Anchor for per-cpu IUCV command parameter block.
  */
-static union iucv_param *iucv_param;
+static union iucv_param *iucv_param[NR_CPUS];
 
 /**
  * iucv_call_b2f0
@@ -356,7 +356,7 @@ static void iucv_allow_cpu(void *data)
 	 *	0x10 - Flag to allow priority message completion interrupts
 	 *	0x08 - Flag to allow IUCV control interrupts
 	 */
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[cpu];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->set_mask.ipmask = 0xf8;
 	iucv_call_b2f0(IUCV_SETMASK, parm);
@@ -377,7 +377,7 @@ static void iucv_block_cpu(void *data)
 	union iucv_param *parm;
 
 	/* Disable all iucv interrupts. */
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[cpu];
 	memset(parm, 0, sizeof(union iucv_param));
 	iucv_call_b2f0(IUCV_SETMASK, parm);
 
@@ -401,9 +401,9 @@ static void iucv_declare_cpu(void *data)
 		return;
 
 	/* Declare interrupt buffer. */
-	parm = percpu_ptr(iucv_param, cpu);
+	parm = iucv_param[cpu];
 	memset(parm, 0, sizeof(union iucv_param));
-	parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(iucv_irq_data, cpu));
+	parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
 	rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
 	if (rc) {
 		char *err = "Unknown";
@@ -458,7 +458,7 @@ static void iucv_retrieve_cpu(void *data)
 	iucv_block_cpu(NULL);
 
 	/* Retrieve interrupt buffer. */
-	parm = percpu_ptr(iucv_param, cpu);
+	parm = iucv_param[cpu];
 	iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
 
 	/* Clear indication that an iucv buffer exists for this cpu. */
@@ -558,22 +558,23 @@ static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
 	switch (action) {
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
-		if (!percpu_populate(iucv_irq_data,
-				     sizeof(struct iucv_irq_data),
-				     GFP_KERNEL|GFP_DMA, cpu))
+		iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
+					GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+		if (!iucv_irq_data[cpu])
 			return NOTIFY_BAD;
-		if (!percpu_populate(iucv_param, sizeof(union iucv_param),
-				     GFP_KERNEL|GFP_DMA, cpu)) {
-			percpu_depopulate(iucv_irq_data, cpu);
+		iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
+				     GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+		if (!iucv_param[cpu])
 			return NOTIFY_BAD;
-		}
 		break;
 	case CPU_UP_CANCELED:
 	case CPU_UP_CANCELED_FROZEN:
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
-		percpu_depopulate(iucv_param, cpu);
-		percpu_depopulate(iucv_irq_data, cpu);
+		kfree(iucv_param[cpu]);
+		iucv_param[cpu] = NULL;
+		kfree(iucv_irq_data[cpu]);
+		iucv_irq_data[cpu] = NULL;
 		break;
 	case CPU_ONLINE:
 	case CPU_ONLINE_FROZEN:
@@ -612,7 +613,7 @@ static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
 {
 	union iucv_param *parm;
 
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (userdata)
 		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
@@ -755,7 +756,7 @@ int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 
 	local_bh_disable();
 	/* Prepare parameter block. */
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->ctrl.ippathid = path->pathid;
 	parm->ctrl.ipmsglim = path->msglim;
@@ -799,7 +800,7 @@ int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 	BUG_ON(in_atomic());
 	spin_lock_bh(&iucv_table_lock);
 	iucv_cleanup_queue();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->ctrl.ipmsglim = path->msglim;
 	parm->ctrl.ipflags1 = path->flags;
@@ -854,7 +855,7 @@ int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (userdata)
 		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
@@ -881,7 +882,7 @@ int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (userdata)
 		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
@@ -936,7 +937,7 @@ int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->purge.ippathid = path->pathid;
 	parm->purge.ipmsgid = msg->id;
@@ -1003,7 +1004,7 @@ int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 	}
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->db.ipbfadr1 = (u32)(addr_t) buffer;
 	parm->db.ipbfln1f = (u32) size;
@@ -1040,7 +1041,7 @@ int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	parm->db.ippathid = path->pathid;
 	parm->db.ipmsgid = msg->id;
@@ -1074,7 +1075,7 @@ int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (flags & IUCV_IPRMDATA) {
 		parm->dpl.ippathid = path->pathid;
@@ -1118,7 +1119,7 @@ int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (flags & IUCV_IPRMDATA) {
 		/* Message of 8 bytes can be placed into the parameter list. */
@@ -1172,7 +1173,7 @@ int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
 	int rc;
 
 	local_bh_disable();
-	parm = percpu_ptr(iucv_param, smp_processor_id());
+	parm = iucv_param[smp_processor_id()];
 	memset(parm, 0, sizeof(union iucv_param));
 	if (flags & IUCV_IPRMDATA) {
 		parm->dpl.ippathid = path->pathid;
@@ -1559,7 +1560,7 @@ static void iucv_external_interrupt(u16 code)
 	struct iucv_irq_data *p;
 	struct iucv_irq_list *work;
 
-	p = percpu_ptr(iucv_irq_data, smp_processor_id());
+	p = iucv_irq_data[smp_processor_id()];
 	if (p->ippathid >= iucv_max_pathid) {
 		printk(KERN_WARNING "iucv_do_int: Got interrupt with "
 		       "pathid %d > max_connections (%ld)\n",
@@ -1598,6 +1599,7 @@ static void iucv_external_interrupt(u16 code)
 static int __init iucv_init(void)
 {
 	int rc;
+	int cpu;
 
 	if (!MACHINE_IS_VM) {
 		rc = -EPROTONOSUPPORT;
@@ -1617,19 +1619,23 @@ static int __init iucv_init(void)
 		rc = PTR_ERR(iucv_root);
 		goto out_bus;
 	}
-	/* Note: GFP_DMA used to get memory below 2G */
-	iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
-				     GFP_KERNEL|GFP_DMA);
-	if (!iucv_irq_data) {
-		rc = -ENOMEM;
-		goto out_root;
-	}
-	/* Allocate parameter blocks. */
-	iucv_param = percpu_alloc(sizeof(union iucv_param),
-				  GFP_KERNEL|GFP_DMA);
-	if (!iucv_param) {
-		rc = -ENOMEM;
-		goto out_extint;
+
+	for_each_online_cpu(cpu) {
+		/* Note: GFP_DMA used to get memory below 2G */
+		iucv_irq_data[cpu] = kmalloc_node(sizeof(struct iucv_irq_data),
+				     GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+		if (!iucv_irq_data[cpu]) {
+			rc = -ENOMEM;
+			goto out_free;
+		}
+
+		/* Allocate parameter blocks. */
+		iucv_param[cpu] = kmalloc_node(sizeof(union iucv_param),
+				  GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+		if (!iucv_param[cpu]) {
+			rc = -ENOMEM;
+			goto out_free;
+		}
 	}
 	register_hotcpu_notifier(&iucv_cpu_notifier);
 	ASCEBC(iucv_error_no_listener, 16);
@@ -1638,9 +1644,13 @@ static int __init iucv_init(void)
 	iucv_available = 1;
 	return 0;
 
-out_extint:
-	percpu_free(iucv_irq_data);
-out_root:
+out_free:
+	for_each_possible_cpu(cpu) {
+		kfree(iucv_param[cpu]);
+		iucv_param[cpu] = NULL;
+		kfree(iucv_irq_data[cpu]);
+		iucv_irq_data[cpu] = NULL;
+	}
 	s390_root_dev_unregister(iucv_root);
 out_bus:
 	bus_unregister(&iucv_bus);
@@ -1658,6 +1668,7 @@ static int __init iucv_init(void)
 static void __exit iucv_exit(void)
 {
 	struct iucv_irq_list *p, *n;
+	int cpu;
 
 	spin_lock_irq(&iucv_queue_lock);
 	list_for_each_entry_safe(p, n, &iucv_task_queue, list)
@@ -1666,8 +1677,12 @@ static void __exit iucv_exit(void)
 		kfree(p);
 	spin_unlock_irq(&iucv_queue_lock);
 	unregister_hotcpu_notifier(&iucv_cpu_notifier);
-	percpu_free(iucv_param);
-	percpu_free(iucv_irq_data);
+	for_each_possible_cpu(cpu) {
+		kfree(iucv_param[cpu]);
+		iucv_param[cpu] = NULL;
+		kfree(iucv_irq_data[cpu]);
+		iucv_irq_data[cpu] = NULL;
+	}
 	s390_root_dev_unregister(iucv_root);
 	bus_unregister(&iucv_bus);
 	unregister_external_interrupt(0x4000, iucv_external_interrupt);