rtl88x2CE_WiFi_linux driver

hc

2024-05-10 cde9070d9970eef1f7ec2360586c802a16230ad8

 kernel/arch/powerpc/platforms/pseries/msi.c
..
..
@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp.
3
4
  * Copyright 2006-2007 Michael Ellerman, IBM Corp.
4
- *
5
- * This program is free software; you can redistribute it and/or
6
- * modify it under the terms of the GNU General Public License
7
- * as published by the Free Software Foundation; version 2 of the
8
- * License.
9
- *
10
5
  */
11
6
 
7
+#include <linux/crash_dump.h>
12
8
 #include <linux/device.h>
13
9
 #include <linux/irq.h>
14
10
 #include <linux/msi.h>
..
..
@@ -203,7 +199,8 @@
203
199
 	/* Get the top level device in the PE */
204
200
 	edev = pdn_to_eeh_dev(PCI_DN(dn));
205
201
 	if (edev->pe)
206
-		edev = list_first_entry(&edev->pe->edevs, struct eeh_dev, list);
202
+		edev = list_first_entry(&edev->pe->edevs, struct eeh_dev,
203
+					entry);
207
204
 	dn = pci_device_to_OF_node(edev->pdev);
208
205
 	if (!dn)
209
206
 		return NULL;
..
..
@@ -462,7 +459,28 @@
462
459
 			return hwirq;
463
460
 		}
464
461
 
465
-		virq = irq_create_mapping(NULL, hwirq);
462
+		/*
463
+		 * Depending on the number of online CPUs in the original
464
+		 * kernel, it is likely for CPU #0 to be offline in a kdump
465
+		 * kernel. The associated IRQs in the affinity mappings
466
+		 * provided by irq_create_affinity_masks() are thus not
467
+		 * started by irq_startup(), as per-design for managed IRQs.
468
+		 * This can be a problem with multi-queue block devices driven
469
+		 * by blk-mq : such a non-started IRQ is very likely paired
470
+		 * with the single queue enforced by blk-mq during kdump (see
471
+		 * blk_mq_alloc_tag_set()). This causes the device to remain
472
+		 * silent and likely hangs the guest at some point.
473
+		 *
474
+		 * We don't really care for fine-grained affinity when doing
475
+		 * kdump actually : simply ignore the pre-computed affinity
476
+		 * masks in this case and let the default mask with all CPUs
477
+		 * be used when creating the IRQ mappings.
478
+		 */
479
+		if (is_kdump_kernel())
480
+			virq = irq_create_mapping(NULL, hwirq);
481
+		else
482
+			virq = irq_create_mapping_affinity(NULL, hwirq,
483
+							   entry->affinity);
466
484
 
467
485
 		if (!virq) {
468
486
 			pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq);