add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/xen/xen-scsiback.c
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@@ -99,6 +99,8 @@
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 	struct list_head v2p_entry_lists;
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100
 
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 	wait_queue_head_t waiting_to_free;
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+
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+	struct gnttab_page_cache free_pages;
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 };
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 /* theoretical maximum of grants for one request */
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@@ -188,10 +190,6 @@
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 MODULE_PARM_DESC(max_buffer_pages,
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 "Maximum number of free pages to keep in backend buffer");
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192
 
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-static DEFINE_SPINLOCK(free_pages_lock);
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-static int free_pages_num;
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-static LIST_HEAD(scsiback_free_pages);
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-
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 /* Global spinlock to protect scsiback TPG list */
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 static DEFINE_MUTEX(scsiback_mutex);
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 static LIST_HEAD(scsiback_list);
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@@ -205,41 +203,6 @@
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 {
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 	if (atomic_dec_and_test(&info->nr_unreplied_reqs))
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 		wake_up(&info->waiting_to_free);
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-}
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-
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-static void put_free_pages(struct page **page, int num)
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-{
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-	unsigned long flags;
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-	int i = free_pages_num + num, n = num;
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-
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-	if (num == 0)
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-		return;
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-	if (i > scsiback_max_buffer_pages) {
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-		n = min(num, i - scsiback_max_buffer_pages);
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-		gnttab_free_pages(n, page + num - n);
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-		n = num - n;
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-	}
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-	spin_lock_irqsave(&free_pages_lock, flags);
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-	for (i = 0; i < n; i++)
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-		list_add(&page[i]->lru, &scsiback_free_pages);
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-	free_pages_num += n;
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-	spin_unlock_irqrestore(&free_pages_lock, flags);
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-}
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-
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-static int get_free_page(struct page **page)
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-{
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-	unsigned long flags;
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-
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-	spin_lock_irqsave(&free_pages_lock, flags);
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-	if (list_empty(&scsiback_free_pages)) {
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-		spin_unlock_irqrestore(&free_pages_lock, flags);
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-		return gnttab_alloc_pages(1, page);
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-	}
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-	page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
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-	list_del(&page[0]->lru);
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-	free_pages_num--;
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-	spin_unlock_irqrestore(&free_pages_lock, flags);
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-	return 0;
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 }
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 static unsigned long vaddr_page(struct page *page)
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@@ -302,7 +265,8 @@
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 		BUG_ON(err);
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 	}
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267
 
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-	put_free_pages(req->pages, req->n_grants);
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+	gnttab_page_cache_put(&req->info->free_pages, req->pages,
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+			      req->n_grants);
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 	req->n_grants = 0;
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 }
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272
 
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@@ -445,8 +409,8 @@
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 	struct vscsibk_info *info = pending_req->info;
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 	for (i = 0; i < cnt; i++) {
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-		if (get_free_page(pg + mapcount)) {
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-			put_free_pages(pg, mapcount);
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+		if (gnttab_page_cache_get(&info->free_pages, pg + mapcount)) {
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+			gnttab_page_cache_put(&info->free_pages, pg, mapcount);
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 			pr_err("no grant page\n");
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 			return -ENOMEM;
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 		}
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@@ -796,6 +760,8 @@
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 		cond_resched();
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 	}
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+	gnttab_page_cache_shrink(&info->free_pages, scsiback_max_buffer_pages);
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+
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 	RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
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 	return more_to_do;
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 }
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@@ -858,7 +824,8 @@
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 static int scsiback_map(struct vscsibk_info *info)
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 {
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 	struct xenbus_device *dev = info->dev;
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-	unsigned int ring_ref, evtchn;
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+	unsigned int ring_ref;
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+	evtchn_port_t evtchn;
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829
 	int err;
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830
 
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 	err = xenbus_gather(XBT_NIL, dev->otherend,
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@@ -1188,7 +1155,7 @@
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 		xenbus_switch_state(dev, XenbusStateClosed);
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 		if (xenbus_dev_is_online(dev))
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 			break;
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-		/* fall through if not online */
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+		fallthrough;	/* if not online */
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 	case XenbusStateUnknown:
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 		device_unregister(&dev->dev);
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 		break;
..
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@@ -1232,6 +1199,8 @@
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1199
 
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 	scsiback_release_translation_entry(info);
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+	gnttab_page_cache_shrink(&info->free_pages, 0);
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+
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 	dev_set_drvdata(&dev->dev, NULL);
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1205
 
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 	return 0;
..
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@@ -1262,6 +1231,7 @@
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 	info->irq = 0;
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 	INIT_LIST_HEAD(&info->v2p_entry_lists);
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 	spin_lock_init(&info->v2p_lock);
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+	gnttab_page_cache_init(&info->free_pages);
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1235
 
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 	err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u",
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 			    SG_ALL);
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@@ -1404,11 +1374,6 @@
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 	/* Go ahead and process the write immediately */
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 	target_execute_cmd(se_cmd);
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1376
 
1407
-	return 0;
1408
-}
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-
1410
-static int scsiback_write_pending_status(struct se_cmd *se_cmd)
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-{
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 	return 0;
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 }
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1379
 
..
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@@ -1715,11 +1680,6 @@
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 	NULL,
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 };
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1718
-static char *scsiback_get_fabric_name(void)
1719
-{
1720
-	return "xen-pvscsi";
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-}
1722
-
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 static int scsiback_port_link(struct se_portal_group *se_tpg,
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 			       struct se_lun *lun)
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 {
..
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@@ -1813,8 +1773,7 @@
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 static const struct target_core_fabric_ops scsiback_ops = {
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 	.module				= THIS_MODULE,
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-	.name				= "xen-pvscsi",
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-	.get_fabric_name		= scsiback_get_fabric_name,
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+	.fabric_name			= "xen-pvscsi",
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 	.tpg_get_wwn			= scsiback_get_fabric_wwn,
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 	.tpg_get_tag			= scsiback_get_tag,
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 	.tpg_check_demo_mode		= scsiback_check_true,
..
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@@ -1827,7 +1786,6 @@
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 	.sess_get_index			= scsiback_sess_get_index,
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 	.sess_get_initiator_sid		= NULL,
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 	.write_pending			= scsiback_write_pending,
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-	.write_pending_status		= scsiback_write_pending_status,
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 	.set_default_node_attributes	= scsiback_set_default_node_attrs,
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 	.get_cmd_state			= scsiback_get_cmd_state,
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 	.queue_data_in			= scsiback_queue_data_in,
..
..
@@ -1890,13 +1848,6 @@
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1848
 
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 static void __exit scsiback_exit(void)
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 {
1893
-	struct page *page;
1894
-
1895
-	while (free_pages_num) {
1896
-		if (get_free_page(&page))
1897
-			BUG();
1898
-		gnttab_free_pages(1, &page);
1899
-	}
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 	target_unregister_template(&scsiback_ops);
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 	xenbus_unregister_driver(&scsiback_driver);
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 }