/* * w1_netlink.h * * Copyright (c) 2003 Evgeniy Polyakov * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __W1_NETLINK_H #define __W1_NETLINK_H #include #include #include "w1.h" /** * enum w1_cn_msg_flags - bitfield flags for struct cn_msg.flags * * @W1_CN_BUNDLE: Request bundling replies into fewer messagse. Be prepared * to handle multiple struct cn_msg, struct w1_netlink_msg, and * struct w1_netlink_cmd in one packet. */ enum w1_cn_msg_flags { W1_CN_BUNDLE = 1, }; /** * enum w1_netlink_message_types - message type * * @W1_SLAVE_ADD: notification that a slave device was added * @W1_SLAVE_REMOVE: notification that a slave device was removed * @W1_MASTER_ADD: notification that a new bus master was added * @W1_MASTER_REMOVE: notification that a bus masterwas removed * @W1_MASTER_CMD: initiate operations on a specific master * @W1_SLAVE_CMD: sends reset, selects the slave, then does a read/write/touch * operation * @W1_LIST_MASTERS: used to determine the bus master identifiers */ enum w1_netlink_message_types { W1_SLAVE_ADD = 0, W1_SLAVE_REMOVE, W1_MASTER_ADD, W1_MASTER_REMOVE, W1_MASTER_CMD, W1_SLAVE_CMD, W1_LIST_MASTERS, }; /** * struct w1_netlink_msg - holds w1 message type, id, and result * * @type: one of enum w1_netlink_message_types * @status: kernel feedback for success 0 or errno failure value * @len: length of data following w1_netlink_msg * @id: union holding master bus id (msg.id) and slave device id (id[8]). * @data: start address of any following data * * The base message structure for w1 messages over netlink. * The netlink connector data sequence is, struct nlmsghdr, struct cn_msg, * then one or more struct w1_netlink_msg (each with optional data). */ struct w1_netlink_msg { __u8 type; __u8 status; __u16 len; union { __u8 id[8]; struct w1_mst { __u32 id; __u32 res; } mst; } id; __u8 data[0]; }; /** * enum w1_commands - commands available for master or slave operations * * @W1_CMD_READ: read len bytes * @W1_CMD_WRITE: write len bytes * @W1_CMD_SEARCH: initiate a standard search, returns only the slave * devices found during that search * @W1_CMD_ALARM_SEARCH: search for devices that are currently alarming * @W1_CMD_TOUCH: Touches a series of bytes. * @W1_CMD_RESET: sends a bus reset on the given master * @W1_CMD_SLAVE_ADD: adds a slave to the given master, * 8 byte slave id at data[0] * @W1_CMD_SLAVE_REMOVE: removes a slave to the given master, * 8 byte slave id at data[0] * @W1_CMD_LIST_SLAVES: list of slaves registered on this master * @W1_CMD_MAX: number of available commands */ enum w1_commands { W1_CMD_READ = 0, W1_CMD_WRITE, W1_CMD_SEARCH, W1_CMD_ALARM_SEARCH, W1_CMD_TOUCH, W1_CMD_RESET, W1_CMD_SLAVE_ADD, W1_CMD_SLAVE_REMOVE, W1_CMD_LIST_SLAVES, W1_CMD_MAX }; /** * struct w1_netlink_cmd - holds the command and data * * @cmd: one of enum w1_commands * @res: reserved * @len: length of data following w1_netlink_cmd * @data: start address of any following data * * One or more struct w1_netlink_cmd is placed starting at w1_netlink_msg.data * each with optional data. */ struct w1_netlink_cmd { __u8 cmd; __u8 res; __u16 len; __u8 data[0]; }; #ifdef __KERNEL__ void w1_netlink_send(struct w1_master *, struct w1_netlink_msg *); int w1_init_netlink(void); void w1_fini_netlink(void); #endif /* __KERNEL__ */ #endif /* __W1_NETLINK_H */ ass='ctrl'>
authorTony Lindgren <tony@atomide.com>2017-01-19 08:49:07 -0800
committerVinod Koul <vinod.koul@intel.com>2017-01-25 11:29:11 +0530
commitae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b (patch)
tree139fc7e29f97d6bb6c4dca2a97be2dc3f824bd51 /net/rds
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
dmaengine: cppi41: Fix runtime PM timeouts with USB mass storage
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") added runtime PM support for cppi41, but had corner case issues. Some of the issues were fixed with commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected"). That fix however caused a new regression where we can get error -115 messages with USB on BeagleBone when connecting a USB mass storage device to a hub. This is because when connecting a USB mass storage device to a hub, the initial DMA transfers can take over 200ms to complete and cppi41 autosuspend delay times out. To fix the issue, we want to implement refcounting for chan_busy array that contains the active dma transfers. Increasing the autosuspend delay won't help as that the delay could be potentially seconds, and it's best to let the USB subsystem to deal with the timeouts on errors. The earlier attempt for runtime PM was buggy as the pm_runtime_get/put() calls could get unpaired easily as they did not follow the state of the chan_busy array as described in commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected". Let's fix the issue by adding pm_runtime_get() to where a new transfer is added to the chan_busy array, and calls to pm_runtime_put() where chan_busy array entry is cleared. This prevents any autosuspend timeouts from happening while dma transfers are active. Fixes: 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected") Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Bin Liu <b-liu@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Patrick Titiano <ptitiano@baylibre.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Bin Liu <b-liu@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'net/rds')