[S390] Explicitly code allocpercpu calls in iucv
Christoph Lameter [Tue, 20 Nov 2007 10:13:38 +0000 (11:13 +0100)]
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: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

net/iucv/iucv.c

index a2f5a6e..7698f6c 100644 (file)
@@ -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 @@ out:
 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);