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hc
2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/net/iucv/iucv.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * IUCV base infrastructure.
34  *
....@@ -17,20 +18,6 @@
1718  * Documentation used:
1819  *    The original source
1920  *    CP Programming Service, IBM document # SC24-5760
20
- *
21
- * This program is free software; you can redistribute it and/or modify
22
- * it under the terms of the GNU General Public License as published by
23
- * the Free Software Foundation; either version 2, or (at your option)
24
- * any later version.
25
- *
26
- * This program is distributed in the hope that it will be useful,
27
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
28
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
29
- * GNU General Public License for more details.
30
- *
31
- * You should have received a copy of the GNU General Public License
32
- * along with this program; if not, write to the Free Software
33
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
3421  */
3522 
3623 #define KMSG_COMPONENT "iucv"
....@@ -80,32 +67,9 @@
8067 	return 0;
8168 }
8269 
83
-enum iucv_pm_states {
84
-	IUCV_PM_INITIAL = 0,
85
-	IUCV_PM_FREEZING = 1,
86
-	IUCV_PM_THAWING = 2,
87
-	IUCV_PM_RESTORING = 3,
88
-};
89
-static enum iucv_pm_states iucv_pm_state;
90
-
91
-static int iucv_pm_prepare(struct device *);
92
-static void iucv_pm_complete(struct device *);
93
-static int iucv_pm_freeze(struct device *);
94
-static int iucv_pm_thaw(struct device *);
95
-static int iucv_pm_restore(struct device *);
96
-
97
-static const struct dev_pm_ops iucv_pm_ops = {
98
-	.prepare = iucv_pm_prepare,
99
-	.complete = iucv_pm_complete,
100
-	.freeze = iucv_pm_freeze,
101
-	.thaw = iucv_pm_thaw,
102
-	.restore = iucv_pm_restore,
103
-};
104
-
10570 struct bus_type iucv_bus = {
10671 	.name = "iucv",
10772 	.match = iucv_bus_match,
108
-	.pm = &iucv_pm_ops,
10973 };
11074 EXPORT_SYMBOL(iucv_bus);
11175 
....@@ -141,7 +105,7 @@
141105  * The tasklet for fast delivery of iucv interrupts.
142106  */
143107 static void iucv_tasklet_fn(unsigned long);
144
-static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
108
+static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn);
145109 
146110 /*
147111  * Queue of interrupt buffers for delivery via a work queue
....@@ -442,31 +406,6 @@
442406 	parm = iucv_param_irq[cpu];
443407 	memset(parm, 0, sizeof(union iucv_param));
444408 	iucv_call_b2f0(IUCV_SETMASK, parm);
445
-
446
-	/* Clear indication that iucv interrupts are allowed for this cpu. */
447
-	cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
448
-}
449
-
450
-/**
451
- * iucv_block_cpu_almost
452
- * @data: unused
453
- *
454
- * Allow connection-severed interrupts only on this cpu.
455
- */
456
-static void iucv_block_cpu_almost(void *data)
457
-{
458
-	int cpu = smp_processor_id();
459
-	union iucv_param *parm;
460
-
461
-	/* Allow iucv control interrupts only */
462
-	parm = iucv_param_irq[cpu];
463
-	memset(parm, 0, sizeof(union iucv_param));
464
-	parm->set_mask.ipmask = 0x08;
465
-	iucv_call_b2f0(IUCV_SETMASK, parm);
466
-	/* Allow iucv-severed interrupt only */
467
-	memset(parm, 0, sizeof(union iucv_param));
468
-	parm->set_mask.ipmask = 0x20;
469
-	iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
470409 
471410 	/* Clear indication that iucv interrupts are allowed for this cpu. */
472411 	cpumask_clear_cpu(cpu, &iucv_irq_cpumask);
....@@ -1177,10 +1116,9 @@
11771116 	if (msg->flags & IUCV_IPRMDATA)
11781117 		return iucv_message_receive_iprmdata(path, msg, flags,
11791118 						     buffer, size, residual);
1180
-	 if (cpumask_empty(&iucv_buffer_cpumask)) {
1181
-		rc = -EIO;
1182
-		goto out;
1183
-	}
1119
+	if (cpumask_empty(&iucv_buffer_cpumask))
1120
+		return -EIO;
1121
+
11841122 	parm = iucv_param[smp_processor_id()];
11851123 	memset(parm, 0, sizeof(union iucv_param));
11861124 	parm->db.ipbfadr1 = (u32)(addr_t) buffer;
....@@ -1196,7 +1134,6 @@
11961134 		if (residual)
11971135 			*residual = parm->db.ipbfln1f;
11981136 	}
1199
-out:
12001137 	return rc;
12011138 }
12021139 EXPORT_SYMBOL(__iucv_message_receive);
....@@ -1845,146 +1782,6 @@
18451782 		tasklet_schedule(&iucv_tasklet);
18461783 	}
18471784 	spin_unlock(&iucv_queue_lock);
1848
-}
1849
-
1850
-static int iucv_pm_prepare(struct device *dev)
1851
-{
1852
-	int rc = 0;
1853
-
1854
-#ifdef CONFIG_PM_DEBUG
1855
-	printk(KERN_INFO "iucv_pm_prepare\n");
1856
-#endif
1857
-	if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
1858
-		rc = dev->driver->pm->prepare(dev);
1859
-	return rc;
1860
-}
1861
-
1862
-static void iucv_pm_complete(struct device *dev)
1863
-{
1864
-#ifdef CONFIG_PM_DEBUG
1865
-	printk(KERN_INFO "iucv_pm_complete\n");
1866
-#endif
1867
-	if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
1868
-		dev->driver->pm->complete(dev);
1869
-}
1870
-
1871
-/**
1872
- * iucv_path_table_empty() - determine if iucv path table is empty
1873
- *
1874
- * Returns 0 if there are still iucv pathes defined
1875
- *	   1 if there are no iucv pathes defined
1876
- */
1877
-static int iucv_path_table_empty(void)
1878
-{
1879
-	int i;
1880
-
1881
-	for (i = 0; i < iucv_max_pathid; i++) {
1882
-		if (iucv_path_table[i])
1883
-			return 0;
1884
-	}
1885
-	return 1;
1886
-}
1887
-
1888
-/**
1889
- * iucv_pm_freeze() - Freeze PM callback
1890
- * @dev:	iucv-based device
1891
- *
1892
- * disable iucv interrupts
1893
- * invoke callback function of the iucv-based driver
1894
- * shut down iucv, if no iucv-pathes are established anymore
1895
- */
1896
-static int iucv_pm_freeze(struct device *dev)
1897
-{
1898
-	int cpu;
1899
-	struct iucv_irq_list *p, *n;
1900
-	int rc = 0;
1901
-
1902
-#ifdef CONFIG_PM_DEBUG
1903
-	printk(KERN_WARNING "iucv_pm_freeze\n");
1904
-#endif
1905
-	if (iucv_pm_state != IUCV_PM_FREEZING) {
1906
-		for_each_cpu(cpu, &iucv_irq_cpumask)
1907
-			smp_call_function_single(cpu, iucv_block_cpu_almost,
1908
-						 NULL, 1);
1909
-		cancel_work_sync(&iucv_work);
1910
-		list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
1911
-			list_del_init(&p->list);
1912
-			iucv_sever_pathid(p->data.ippathid,
1913
-					  iucv_error_no_listener);
1914
-			kfree(p);
1915
-		}
1916
-	}
1917
-	iucv_pm_state = IUCV_PM_FREEZING;
1918
-	if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
1919
-		rc = dev->driver->pm->freeze(dev);
1920
-	if (iucv_path_table_empty())
1921
-		iucv_disable();
1922
-	return rc;
1923
-}
1924
-
1925
-/**
1926
- * iucv_pm_thaw() - Thaw PM callback
1927
- * @dev:	iucv-based device
1928
- *
1929
- * make iucv ready for use again: allocate path table, declare interrupt buffers
1930
- *				  and enable iucv interrupts
1931
- * invoke callback function of the iucv-based driver
1932
- */
1933
-static int iucv_pm_thaw(struct device *dev)
1934
-{
1935
-	int rc = 0;
1936
-
1937
-#ifdef CONFIG_PM_DEBUG
1938
-	printk(KERN_WARNING "iucv_pm_thaw\n");
1939
-#endif
1940
-	iucv_pm_state = IUCV_PM_THAWING;
1941
-	if (!iucv_path_table) {
1942
-		rc = iucv_enable();
1943
-		if (rc)
1944
-			goto out;
1945
-	}
1946
-	if (cpumask_empty(&iucv_irq_cpumask)) {
1947
-		if (iucv_nonsmp_handler)
1948
-			/* enable interrupts on one cpu */
1949
-			iucv_allow_cpu(NULL);
1950
-		else
1951
-			/* enable interrupts on all cpus */
1952
-			iucv_setmask_mp();
1953
-	}
1954
-	if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
1955
-		rc = dev->driver->pm->thaw(dev);
1956
-out:
1957
-	return rc;
1958
-}
1959
-
1960
-/**
1961
- * iucv_pm_restore() - Restore PM callback
1962
- * @dev:	iucv-based device
1963
- *
1964
- * make iucv ready for use again: allocate path table, declare interrupt buffers
1965
- *				  and enable iucv interrupts
1966
- * invoke callback function of the iucv-based driver
1967
- */
1968
-static int iucv_pm_restore(struct device *dev)
1969
-{
1970
-	int rc = 0;
1971
-
1972
-#ifdef CONFIG_PM_DEBUG
1973
-	printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
1974
-#endif
1975
-	if ((iucv_pm_state != IUCV_PM_RESTORING) && iucv_path_table)
1976
-		pr_warn("Suspending Linux did not completely close all IUCV connections\n");
1977
-	iucv_pm_state = IUCV_PM_RESTORING;
1978
-	if (cpumask_empty(&iucv_irq_cpumask)) {
1979
-		rc = iucv_query_maxconn();
1980
-		rc = iucv_enable();
1981
-		if (rc)
1982
-			goto out;
1983
-	}
1984
-	if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
1985
-		rc = dev->driver->pm->restore(dev);
1986
-out:
1987
-	return rc;
19881785 }
19891786 
19901787 struct iucv_interface iucv_if = {