[RFC] ehea: kdump support - rework

[Thomas Klein <osstklei@de.ibm.com>]

This patch adds kdump support using the new PPC crash shutdown hook to the
ehea driver.
The reworked implementation follows the feedback I got. The crash handler
now just iterates over two simple arrays instead of handling linked lists.

Further feedback will be appreciated.

ehea kdump support RFC #1:
  http://lkml.org/lkml/2007/12/12/241


Signed-off-by: Thomas Klein <tklein@de.ibm.com>

---
diff -Nurp -X dontdiff linux-2.6.24-rc5/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h
--- linux-2.6.24-rc5/drivers/net/ehea/ehea.h	2007-12-11 04:48:43.000000000 +0100
+++ patched_kernel/drivers/net/ehea/ehea.h	2007-12-17 16:18:49.000000000 +0100
@@ -40,7 +40,7 @@
 #include <asm/io.h>
 
 #define DRV_NAME	"ehea"
-#define DRV_VERSION	"EHEA_0083"
+#define DRV_VERSION	"EHEA_0085"
 
 /* eHEA capability flags */
 #define DLPAR_PORT_ADD_REM 1
@@ -386,6 +386,13 @@ struct ehea_port_res {
 
 
 #define EHEA_MAX_PORTS 16
+
+#define EHEA_NUM_PORTRES_FW_HANDLES    6  /* QP handle, SendCQ handle,
+					     RecvCQ handle, EQ handle,
+					     SendMR handle, RecvMR handle */
+#define EHEA_NUM_PORT_FW_HANDLES       1  /* EQ handle */
+#define EHEA_NUM_ADAPTER_FW_HANDLES    2  /* MR handle, NEQ handle */
+
 struct ehea_adapter {
 	u64 handle;
 	struct of_device *ofdev;
@@ -405,6 +412,31 @@ struct ehea_mc_list {
 	u64 macaddr;
 };
 
+/* kdump support */
+struct ehea_fw_handle_entry {
+	u64 adh;               /* Adapter Handle */
+	u64 fwh;               /* Firmware Handle */
+};
+
+struct ehea_fw_handle_array {
+	struct ehea_fw_handle_entry *arr;
+	int num_entries;
+	struct semaphore lock;
+};
+
+struct ehea_bcmc_reg_entry {
+	u64 adh;               /* Adapter Handle */
+	u32 port_id;           /* Logical Port Id */
+	u8 reg_type;           /* Registration Type */
+	u64 macaddr;
+};
+
+struct ehea_bcmc_reg_array {
+	struct ehea_bcmc_reg_entry *arr;
+	int num_entries;
+	struct semaphore lock;
+};
+
 #define EHEA_PORT_UP 1
 #define EHEA_PORT_DOWN 0
 #define EHEA_PHY_LINK_UP 1
diff -Nurp -X dontdiff linux-2.6.24-rc5/drivers/net/ehea/ehea_main.c patched_kernel/drivers/net/ehea/ehea_main.c
--- linux-2.6.24-rc5/drivers/net/ehea/ehea_main.c	2007-12-11 04:48:43.000000000 +0100
+++ patched_kernel/drivers/net/ehea/ehea_main.c	2007-12-17 16:18:49.000000000 +0100
@@ -35,6 +35,7 @@
 #include <linux/if_ether.h>
 #include <linux/notifier.h>
 #include <linux/reboot.h>
+#include <asm/kexec.h>
 
 #include <net/ip.h>
 
@@ -98,8 +99,10 @@ static int port_name_cnt = 0;
 static LIST_HEAD(adapter_list);
 u64 ehea_driver_flags = 0;
 struct work_struct ehea_rereg_mr_task;
-
 struct semaphore dlpar_mem_lock;
+struct ehea_fw_handle_array ehea_fw_handles;
+struct ehea_bcmc_reg_array ehea_bcmc_regs;
+
 
 static int __devinit ehea_probe_adapter(struct of_device *dev,
 					const struct of_device_id *id);
@@ -131,6 +134,160 @@ void ehea_dump(void *adr, int len, char 
 	}
 }
 
+static void ehea_update_firmware_handles(void)
+{
+	struct ehea_fw_handle_entry *arr = NULL;
+	struct ehea_adapter *adapter;
+	int num_adapters = 0;
+	int num_ports = 0;
+	int num_portres = 0;
+	int i = 0;
+	int num_fw_handles, k, l;
+
+	/* Determine number of handles */
+	list_for_each_entry(adapter, &adapter_list, list) {
+		num_adapters++;
+
+		for (k = 0; k < EHEA_MAX_PORTS; k++) {
+			struct ehea_port *port = adapter->port[k];
+
+			if (!port || (port->state != EHEA_PORT_UP))
+				continue;
+
+			num_ports++;
+			num_portres += port->num_def_qps + port->num_add_tx_qps;
+		}
+	}
+
+	num_fw_handles = num_adapters * EHEA_NUM_ADAPTER_FW_HANDLES +
+			 num_ports * EHEA_NUM_PORT_FW_HANDLES +
+			 num_portres * EHEA_NUM_PORTRES_FW_HANDLES;
+
+	if (num_fw_handles) {
+		arr = kzalloc(num_fw_handles * sizeof(*arr), GFP_KERNEL);
+		if (!arr)
+			return;  /* Keep the existing array */
+	} else
+		goto out_update;
+
+	list_for_each_entry(adapter, &adapter_list, list) {
+		for (k = 0; k < EHEA_MAX_PORTS; k++) {
+			struct ehea_port *port = adapter->port[k];
+
+			if (!port || (port->state != EHEA_PORT_UP))
+				continue;
+
+			for (l = 0;
+			     l < port->num_def_qps + port->num_add_tx_qps;
+			     l++) {
+				struct ehea_port_res *pr = &port->port_res[l];
+
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->qp->fw_handle;
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->send_cq->fw_handle;
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->recv_cq->fw_handle;
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->eq->fw_handle;
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->send_mr.handle;
+				arr[i].adh = adapter->handle;
+				arr[i++].fwh = pr->recv_mr.handle;
+			}
+			arr[i].adh = adapter->handle;
+			arr[i++].fwh = port->qp_eq->fw_handle;
+		}
+
+		arr[i].adh = adapter->handle;
+		arr[i++].fwh = adapter->neq->fw_handle;
+
+		if (adapter->mr.handle) {
+			arr[i].adh = adapter->handle;
+			arr[i++].fwh = adapter->mr.handle;
+		}
+	}
+
+out_update:
+	kfree(ehea_fw_handles.arr);
+	ehea_fw_handles.arr = arr;
+	ehea_fw_handles.num_entries = i;
+}
+
+static void ehea_update_bcmc_registrations(void)
+{
+	struct ehea_bcmc_reg_entry *arr = NULL;
+	struct ehea_adapter *adapter;
+	struct ehea_mc_list *mc_entry;
+	int num_registrations = 0;
+	int i = 0;
+	int k;
+
+	/* Determine number of registrations */
+	list_for_each_entry(adapter, &adapter_list, list)
+		for (k = 0; k < EHEA_MAX_PORTS; k++) {
+			struct ehea_port *port = adapter->port[k];
+
+			if (!port || (port->state != EHEA_PORT_UP))
+				continue;
+
+			num_registrations += 2;	/* Broadcast registrations */
+
+			list_for_each_entry(mc_entry, &port->mc_list->list,list)
+				num_registrations += 2;
+		}
+
+	if (num_registrations) {
+		arr = kzalloc(num_registrations * sizeof(*arr), GFP_KERNEL);
+		if (!arr)
+			return;  /* Keep the existing array */
+	} else
+		goto out_update;
+
+	list_for_each_entry(adapter, &adapter_list, list) {
+		for (k = 0; k < EHEA_MAX_PORTS; k++) {
+			struct ehea_port *port = adapter->port[k];
+
+			if (!port || (port->state != EHEA_PORT_UP))
+				continue;
+
+			arr[i].adh = adapter->handle;
+			arr[i].port_id = port->logical_port_id;
+			arr[i].reg_type = EHEA_BCMC_BROADCAST |
+					  EHEA_BCMC_UNTAGGED;
+			arr[i++].macaddr = port->mac_addr;
+
+			arr[i].adh = adapter->handle;
+			arr[i].port_id = port->logical_port_id;
+			arr[i].reg_type = EHEA_BCMC_BROADCAST |
+					  EHEA_BCMC_VLANID_ALL;
+			arr[i++].macaddr = port->mac_addr;
+
+			list_for_each_entry(mc_entry,
+					    &port->mc_list->list, list) {
+				arr[i].adh = adapter->handle;
+				arr[i].port_id = port->logical_port_id;
+				arr[i].reg_type = EHEA_BCMC_SCOPE_ALL |
+						  EHEA_BCMC_MULTICAST |
+						  EHEA_BCMC_UNTAGGED;
+				arr[i++].macaddr = mc_entry->macaddr;
+
+				arr[i].adh = adapter->handle;
+				arr[i].port_id = port->logical_port_id;
+				arr[i].reg_type = EHEA_BCMC_SCOPE_ALL |
+						  EHEA_BCMC_MULTICAST |
+						  EHEA_BCMC_VLANID_ALL;
+				arr[i++].macaddr = mc_entry->macaddr;
+			}
+		}
+	}
+
+out_update:
+	kfree(ehea_bcmc_regs.arr);
+	ehea_bcmc_regs.arr = arr;
+	ehea_bcmc_regs.num_entries = i;
+}
+
 static struct net_device_stats *ehea_get_stats(struct net_device *dev)
 {
 	struct ehea_port *port = netdev_priv(dev);
@@ -1595,19 +1752,25 @@ static int ehea_set_mac_addr(struct net_
 
 	memcpy(dev->dev_addr, mac_addr->sa_data, dev->addr_len);
 
+	down(&ehea_bcmc_regs.lock);
+
 	/* Deregister old MAC in pHYP */
 	ret = ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
 	if (ret)
-		goto out_free;
+		goto out_upregs;
 
 	port->mac_addr = cb0->port_mac_addr << 16;
 
 	/* Register new MAC in pHYP */
 	ret = ehea_broadcast_reg_helper(port, H_REG_BCMC);
 	if (ret)
-		goto out_free;
+		goto out_upregs;
 
 	ret = 0;
+
+out_upregs:
+	ehea_update_bcmc_registrations();
+	up(&ehea_bcmc_regs.lock);
 out_free:
 	kfree(cb0);
 out:
@@ -1769,9 +1932,11 @@ static void ehea_set_multicast_list(stru
 	}
 	ehea_promiscuous(dev, 0);
 
+	down(&ehea_bcmc_regs.lock);
+
 	if (dev->flags & IFF_ALLMULTI) {
 		ehea_allmulti(dev, 1);
-		return;
+		goto out;
 	}
 	ehea_allmulti(dev, 0);
 
@@ -1798,6 +1963,8 @@ static void ehea_set_multicast_list(stru
 		}
 	}
 out:
+	ehea_update_bcmc_registrations();
+	up(&ehea_bcmc_regs.lock);
 	return;
 }
 
@@ -2280,6 +2447,8 @@ static int ehea_up(struct net_device *de
 	if (port->state == EHEA_PORT_UP)
 		return 0;
 
+	down(&ehea_fw_handles.lock);
+
 	ret = ehea_port_res_setup(port, port->num_def_qps,
 				  port->num_add_tx_qps);
 	if (ret) {
@@ -2316,8 +2485,17 @@ static int ehea_up(struct net_device *de
 		}
 	}
 
-	ret = 0;
+	down(&ehea_bcmc_regs.lock);
+
+	ret = ehea_broadcast_reg_helper(port, H_REG_BCMC);
+	if (ret) {
+		ret = -EIO;
+		goto out_free_irqs;
+	}
+
 	port->state = EHEA_PORT_UP;
+
+	ret = 0;
 	goto out;
 
 out_free_irqs:
@@ -2329,6 +2507,12 @@ out:
 	if (ret)
 		ehea_info("Failed starting %s. ret=%i", dev->name, ret);
 
+	ehea_update_bcmc_registrations();
+	up(&ehea_bcmc_regs.lock);
+
+	ehea_update_firmware_handles();
+	up(&ehea_fw_handles.lock);
+
 	return ret;
 }
 
@@ -2377,16 +2561,27 @@ static int ehea_down(struct net_device *
 	if (port->state == EHEA_PORT_DOWN)
 		return 0;
 
+	down(&ehea_bcmc_regs.lock);
 	ehea_drop_multicast_list(dev);
+	ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
+
 	ehea_free_interrupts(dev);
 
+	down(&ehea_fw_handles.lock);
+
 	port->state = EHEA_PORT_DOWN;
 
+	ehea_update_bcmc_registrations();
+	up(&ehea_bcmc_regs.lock);
+
 	ret = ehea_clean_all_portres(port);
 	if (ret)
 		ehea_info("Failed freeing resources for %s. ret=%i",
 			  dev->name, ret);
 
+	ehea_update_firmware_handles();
+	up(&ehea_fw_handles.lock);
+
 	return ret;
 }
 
@@ -2952,19 +3147,12 @@ struct ehea_port *ehea_setup_single_port
 	dev->watchdog_timeo = EHEA_WATCH_DOG_TIMEOUT;
 
 	INIT_WORK(&port->reset_task, ehea_reset_port);
-
-	ret = ehea_broadcast_reg_helper(port, H_REG_BCMC);
-	if (ret) {
-		ret = -EIO;
-		goto out_unreg_port;
-	}
-
 	ehea_set_ethtool_ops(dev);
 
 	ret = register_netdev(dev);
 	if (ret) {
 		ehea_error("register_netdev failed. ret=%d", ret);
-		goto out_dereg_bc;
+		goto out_unreg_port;
 	}
 
 	port->lro_max_aggr = lro_max_aggr;
@@ -2981,9 +3169,6 @@ struct ehea_port *ehea_setup_single_port
 
 	return port;
 
-out_dereg_bc:
-	ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
-
 out_unreg_port:
 	ehea_unregister_port(port);
 
@@ -3003,7 +3188,6 @@ static void ehea_shutdown_single_port(st
 {
 	unregister_netdev(port->netdev);
 	ehea_unregister_port(port);
-	ehea_broadcast_reg_helper(port, H_DEREG_BCMC);
 	kfree(port->mc_list);
 	free_netdev(port->netdev);
 	port->adapter->active_ports--;
@@ -3046,7 +3230,6 @@ static int ehea_setup_ports(struct ehea_
 
 		i++;
 	};
-
 	return 0;
 }
 
@@ -3191,6 +3374,7 @@ static int __devinit ehea_probe_adapter(
 		ehea_error("Invalid ibmebus device probed");
 		return -EINVAL;
 	}
+	down(&ehea_fw_handles.lock);
 
 	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
 	if (!adapter) {
@@ -3271,7 +3455,10 @@ out_kill_eq:
 
 out_free_ad:
 	kfree(adapter);
+
 out:
+	ehea_update_firmware_handles();
+	up(&ehea_fw_handles.lock);
 	return ret;
 }
 
@@ -3290,18 +3477,41 @@ static int __devexit ehea_remove(struct 
 
 	flush_scheduled_work();
 
+	down(&ehea_fw_handles.lock);
+
 	ibmebus_free_irq(adapter->neq->attr.ist1, adapter);
 	tasklet_kill(&adapter->neq_tasklet);
 
 	ehea_destroy_eq(adapter->neq);
 	ehea_remove_adapter_mr(adapter);
 	list_del(&adapter->list);
-
 	kfree(adapter);
 
+	ehea_update_firmware_handles();
+	up(&ehea_fw_handles.lock);
+
 	return 0;
 }
 
+void ehea_crash_handler(void)
+{
+	int i;
+
+	if (ehea_fw_handles.arr)
+		for (i = 0; i < ehea_fw_handles.num_entries; i++)
+			ehea_h_free_resource(ehea_fw_handles.arr[i].adh,
+					     ehea_fw_handles.arr[i].fwh,
+					     FORCE_FREE);
+
+	if (ehea_bcmc_regs.arr)
+		for (i = 0; i < ehea_bcmc_regs.num_entries; i++)
+			ehea_h_reg_dereg_bcmc(ehea_bcmc_regs.arr[i].adh,
+					      ehea_bcmc_regs.arr[i].port_id,
+					      ehea_bcmc_regs.arr[i].reg_type,
+					      ehea_bcmc_regs.arr[i].macaddr,
+					      0, H_DEREG_BCMC);
+}
+
 static int ehea_reboot_notifier(struct notifier_block *nb,
 				unsigned long action, void *unused)
 {
@@ -3362,7 +3572,12 @@ int __init ehea_module_init(void)
 
 
 	INIT_WORK(&ehea_rereg_mr_task, ehea_rereg_mrs);
+	memset(&ehea_fw_handles, 0, sizeof(ehea_fw_handles));
+	memset(&ehea_bcmc_regs, 0, sizeof(ehea_bcmc_regs));
+
 	sema_init(&dlpar_mem_lock, 1);
+	sema_init(&ehea_fw_handles.lock, 1);
+	sema_init(&ehea_bcmc_regs.lock, 1);
 
 	ret = check_module_parm();
 	if (ret)
@@ -3373,6 +3588,9 @@ int __init ehea_module_init(void)
 		goto out;
 
 	register_reboot_notifier(&ehea_reboot_nb);
+	ret = crash_shutdown_register(&ehea_crash_handler);
+	if (ret)
+		ehea_info("failed registering crash handler");
 
 	ret = ibmebus_register_driver(&ehea_driver);
 	if (ret) {
@@ -3386,6 +3604,7 @@ int __init ehea_module_init(void)
 		ehea_error("failed to register capabilities attribute, ret=%d",
 			   ret);
 		unregister_reboot_notifier(&ehea_reboot_nb);
+		crash_shutdown_unregister(&ehea_crash_handler);
 		ibmebus_unregister_driver(&ehea_driver);
 		goto out;
 	}
@@ -3396,10 +3615,17 @@ out:
 
 static void __exit ehea_module_exit(void)
 {
+	int ret;
+
 	flush_scheduled_work();
 	driver_remove_file(&ehea_driver.driver, &driver_attr_capabilities);
 	ibmebus_unregister_driver(&ehea_driver);
 	unregister_reboot_notifier(&ehea_reboot_nb);
+	ret = crash_shutdown_unregister(&ehea_crash_handler);
+	if (ret)
+		ehea_info("failed unregistering crash handler");
+	kfree(ehea_fw_handles.arr);
+	kfree(ehea_bcmc_regs.arr);
 	ehea_destroy_busmap();
 }
--
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