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Commit 7f34cbab authored by Jinesh K. Jayakumar's avatar Jinesh K. Jayakumar
Browse files

msm: ipa: Add support for crashdump in IPA offload sub-system 



Enable support in IPA offload sub-system to call into network and
offload drivers to collect device registers during a kernel panic.

Change-Id: I35b1b84d29716f78f19606a3603447df1cfd0c6b
Signed-off-by: default avatarJinesh K. Jayakumar <jineshk@codeaurora.org>
parent 74939878

drivers/platform/msm/ipa/ipa_v3/ethernet/ipa_eth.c

+35 −0
Original line number Diff line number Diff line
@@ -1014,11 +1014,41 @@ static void ipa_eth_ipc_log_cleanup(void) 
	}

}



static int ipa_eth_panic_save_device(struct ipa_eth_device *eth_dev)

{

	ipa_eth_net_save_regs(eth_dev);

	ipa_eth_offload_save_regs(eth_dev);



	return 0;

}



static int ipa_eth_panic_notifier(struct notifier_block *nb,

	unsigned long event, void *ptr)

{

	struct ipa_eth_device *eth_dev;



	mutex_lock(&ipa_eth_devices_lock);



	list_for_each_entry(eth_dev, &ipa_eth_devices, device_list)

		ipa_eth_panic_save_device(eth_dev);



	mutex_unlock(&ipa_eth_devices_lock);



	return NOTIFY_DONE;

}



static struct notifier_block ipa_eth_panic_nb = {

	.notifier_call  = ipa_eth_panic_notifier,

};



int ipa_eth_init(void)

{

	int rc;

	unsigned int wq_flags = WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_FREEZABLE;



	(void) atomic_notifier_chain_register(

			&panic_notifier_list, &ipa_eth_panic_nb);



	rc = ipa_eth_ipc_log_init();

	if (rc) {

		ipa_eth_err("Failed to initialize IPC logging");
@@ -1087,6 +1117,8 @@ int ipa_eth_init(void) 
err_dbgfs:

	ipa_eth_ipc_log_cleanup();

err_ipclog:

	(void) atomic_notifier_chain_unregister(

			&panic_notifier_list, &ipa_eth_panic_nb);

	return rc;

}
@@ -1107,4 +1139,7 @@ void ipa_eth_exit(void) 


	ipa_eth_debugfs_cleanup();

	ipa_eth_ipc_log_cleanup();



	(void) atomic_notifier_chain_unregister(

			&panic_notifier_list, &ipa_eth_panic_nb);

}

drivers/platform/msm/ipa/ipa_v3/ethernet/ipa_eth_i.h

+4 −0
Original line number Diff line number Diff line
@@ -146,9 +146,13 @@ int ipa_eth_offload_deinit(struct ipa_eth_device *eth_dev); 
int ipa_eth_offload_start(struct ipa_eth_device *eth_dev);

int ipa_eth_offload_stop(struct ipa_eth_device *eth_dev);



int ipa_eth_offload_save_regs(struct ipa_eth_device *eth_dev);



int ipa_eth_net_open_device(struct ipa_eth_device *eth_dev);

void ipa_eth_net_close_device(struct ipa_eth_device *eth_dev);



int ipa_eth_net_save_regs(struct ipa_eth_device *eth_dev);



int ipa_eth_ep_init_headers(struct ipa_eth_device *eth_dev);

int ipa_eth_ep_register_interface(struct ipa_eth_device *eth_dev);

int ipa_eth_ep_unregister_interface(struct ipa_eth_device *eth_dev);

drivers/platform/msm/ipa/ipa_v3/ethernet/ipa_eth_net.c

+10 −0
Original line number Diff line number Diff line
@@ -1058,3 +1058,13 @@ struct ipa_eth_resource *ipa_eth_net_ch_to_cb_mem( 
	return cb_mem;

}

EXPORT_SYMBOL(ipa_eth_net_ch_to_cb_mem);



int ipa_eth_net_save_regs(struct ipa_eth_device *eth_dev)

{

	struct ipa_eth_net_driver *nd = eth_dev->nd;



	if (nd && nd->ops->save_regs)

		return ipa_eth_nd_op(eth_dev, save_regs, eth_dev, NULL, NULL);



	return 0;

}

drivers/platform/msm/ipa/ipa_v3/ethernet/ipa_eth_offload.c

+10 −0
Original line number Diff line number Diff line
@@ -212,6 +212,16 @@ void ipa_eth_offload_unregister_driver(struct ipa_eth_offload_driver *od) 
	mutex_unlock(&ipa_eth_offload_drivers_lock);

}



int ipa_eth_offload_save_regs(struct ipa_eth_device *eth_dev)

{

	struct ipa_eth_offload_driver *od = eth_dev->od;



	if (od && od->ops->save_regs)

		return eth_dev->od->ops->save_regs(eth_dev, NULL, NULL);



	return 0;

}



int ipa_eth_offload_modinit(struct dentry *dbgfs_root)

{

	int rc;

include/linux/ipa_eth.h

+24 −1
Original line number Diff line number Diff line
@@ -38,9 +38,10 @@ 
 *                  defined via struct ipa_eth_dma_allocator interface

 *                - probe() and remove() offload bus ops are replaced by pair()

 *                  and unpair() callbacks respectively

 *           3    - Added .save_regs() callback for network and offload drivers

 */



#define IPA_ETH_API_VER 2

#define IPA_ETH_API_VER 3



/**

 * enum ipa_eth_dev_features - Features supported by an ethernet device or
@@ -687,6 +688,17 @@ struct ipa_eth_net_ops { 
	 */

	int (*transmit_skb)(struct ipa_eth_device *eth_dev,

		struct sk_buff *skb);



	/**

	 * .save_regs() - Save registers for debugging

	 * @eth_dev: Offloaded device

	 * @regs: if not NULL, write saved data address to the given pointer

	 * @size: if not NULL, write the size of saved data to the given pointer

	 *

	 * Return: 0 on success, errno otherwise.

	 */

	int (*save_regs)(struct ipa_eth_device *eth_dev,

		void **regs, size_t *size);

};



/**
@@ -877,6 +889,17 @@ struct ipa_eth_offload_ops { 
	 * Return: 0 on success, negative errno otherwise

	 */

	int (*clear_stats)(struct ipa_eth_device *eth_dev);



	/**

	 * .save_regs() - Save registers for debugging

	 * @eth_dev: Offloaded device

	 * @regs: if not NULL, write saved data address to the given pointer

	 * @size: if not NULL, write the size of saved data to the given pointer

	 *

	 * Return: 0 on success, errno otherwise.

	 */

	int (*save_regs)(struct ipa_eth_device *eth_dev,

		void **regs, size_t *size);

};



/**