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![Oliver Neukum](/assets/img/avatar_default.png)
del_timer_sync() cannot be used in interrupt. Replace it with del_timer() and a flag Signed-off-by: Oliver Neukum <oneukum@suse.de> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
622 lines
18 KiB
C
622 lines
18 KiB
C
/*
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* WUSB Wire Adapter: Radio Control Interface (WUSB[8])
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* Notification and Event Handling
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* The RC interface of the Host Wire Adapter (USB dongle) or WHCI PCI
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* card delivers a stream of notifications and events to the
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* notification end event endpoint or area. This code takes care of
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* getting a buffer with that data, breaking it up in separate
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* notifications and events and then deliver those.
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*
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* Events are answers to commands and they carry a context ID that
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* associates them to the command. Notifications are that,
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* notifications, they come out of the blue and have a context ID of
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* zero. Think of the context ID kind of like a handler. The
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* uwb_rc_neh_* code deals with managing context IDs.
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*
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* This is why you require a handle to operate on a UWB host. When you
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* open a handle a context ID is assigned to you.
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*
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* So, as it is done is:
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*
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* 1. Add an event handler [uwb_rc_neh_add()] (assigns a ctx id)
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* 2. Issue command [rc->cmd(rc, ...)]
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* 3. Arm the timeout timer [uwb_rc_neh_arm()]
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* 4, Release the reference to the neh [uwb_rc_neh_put()]
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* 5. Wait for the callback
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* 6. Command result (RCEB) is passed to the callback
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*
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* If (2) fails, you should remove the handle [uwb_rc_neh_rm()]
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* instead of arming the timer.
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*
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* Handles are for using in *serialized* code, single thread.
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*
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* When the notification/event comes, the IRQ handler/endpoint
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* callback passes the data read to uwb_rc_neh_grok() which will break
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* it up in a discrete series of events, look up who is listening for
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* them and execute the pertinent callbacks.
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*
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* If the reader detects an error while reading the data stream, call
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* uwb_rc_neh_error().
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*
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* CONSTRAINTS/ASSUMPTIONS:
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*
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* - Most notifications/events are small (less thank .5k), copying
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* around is ok.
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*
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* - Notifications/events are ALWAYS smaller than PAGE_SIZE
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*
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* - Notifications/events always come in a single piece (ie: a buffer
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* will always contain entire notifications/events).
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*
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* - we cannot know in advance how long each event is (because they
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* lack a length field in their header--smart move by the standards
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* body, btw). So we need a facility to get the event size given the
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* header. This is what the EST code does (notif/Event Size
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* Tables), check nest.c--as well, you can associate the size to
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* the handle [w/ neh->extra_size()].
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*
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* - Most notifications/events are fixed size; only a few are variable
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* size (NEST takes care of that).
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*
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* - Listeners of events expect them, so they usually provide a
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* buffer, as they know the size. Listeners to notifications don't,
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* so we allocate their buffers dynamically.
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*/
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include "uwb-internal.h"
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/*
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* UWB Radio Controller Notification/Event Handle
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*
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* Represents an entity waiting for an event coming from the UWB Radio
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* Controller with a given context id (context) and type (evt_type and
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* evt). On reception of the notification/event, the callback (cb) is
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* called with the event.
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*
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* If the timer expires before the event is received, the callback is
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* called with -ETIMEDOUT as the event size.
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*/
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struct uwb_rc_neh {
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struct kref kref;
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struct uwb_rc *rc;
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u8 evt_type;
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__le16 evt;
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u8 context;
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u8 completed;
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uwb_rc_cmd_cb_f cb;
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void *arg;
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struct timer_list timer;
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struct list_head list_node;
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};
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static void uwb_rc_neh_timer(unsigned long arg);
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static void uwb_rc_neh_release(struct kref *kref)
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{
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struct uwb_rc_neh *neh = container_of(kref, struct uwb_rc_neh, kref);
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kfree(neh);
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}
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static void uwb_rc_neh_get(struct uwb_rc_neh *neh)
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{
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kref_get(&neh->kref);
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}
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/**
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* uwb_rc_neh_put - release reference to a neh
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* @neh: the neh
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*/
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void uwb_rc_neh_put(struct uwb_rc_neh *neh)
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{
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kref_put(&neh->kref, uwb_rc_neh_release);
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}
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/**
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* Assigns @neh a context id from @rc's pool
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*
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* @rc: UWB Radio Controller descriptor; @rc->neh_lock taken
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* @neh: Notification/Event Handle
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* @returns 0 if context id was assigned ok; < 0 errno on error (if
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* all the context IDs are taken).
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*
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* (assumes @wa is locked).
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*
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* NOTE: WUSB spec reserves context ids 0x00 for notifications and
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* 0xff is invalid, so they must not be used. Initialization
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* fills up those two in the bitmap so they are not allocated.
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*
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* We spread the allocation around to reduce the possibility of two
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* consecutive opened @neh's getting the same context ID assigned (to
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* avoid surprises with late events that timed out long time ago). So
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* first we search from where @rc->ctx_roll is, if not found, we
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* search from zero.
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*/
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static
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int __uwb_rc_ctx_get(struct uwb_rc *rc, struct uwb_rc_neh *neh)
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{
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int result;
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result = find_next_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX,
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rc->ctx_roll++);
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if (result < UWB_RC_CTX_MAX)
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goto found;
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result = find_first_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX);
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if (result < UWB_RC_CTX_MAX)
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goto found;
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return -ENFILE;
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found:
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set_bit(result, rc->ctx_bm);
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neh->context = result;
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return 0;
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}
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/** Releases @neh's context ID back to @rc (@rc->neh_lock is locked). */
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static
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void __uwb_rc_ctx_put(struct uwb_rc *rc, struct uwb_rc_neh *neh)
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{
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struct device *dev = &rc->uwb_dev.dev;
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if (neh->context == 0)
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return;
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if (test_bit(neh->context, rc->ctx_bm) == 0) {
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dev_err(dev, "context %u not set in bitmap\n",
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neh->context);
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WARN_ON(1);
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}
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clear_bit(neh->context, rc->ctx_bm);
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neh->context = 0;
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}
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/**
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* uwb_rc_neh_add - add a neh for a radio controller command
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* @rc: the radio controller
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* @cmd: the radio controller command
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* @expected_type: the type of the expected response event
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* @expected_event: the expected event ID
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* @cb: callback for when the event is received
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* @arg: argument for the callback
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*
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* Creates a neh and adds it to the list of those waiting for an
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* event. A context ID will be assigned to the command.
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*/
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struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
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u8 expected_type, u16 expected_event,
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uwb_rc_cmd_cb_f cb, void *arg)
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{
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int result;
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unsigned long flags;
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struct device *dev = &rc->uwb_dev.dev;
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struct uwb_rc_neh *neh;
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neh = kzalloc(sizeof(*neh), GFP_KERNEL);
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if (neh == NULL) {
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result = -ENOMEM;
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goto error_kzalloc;
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}
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kref_init(&neh->kref);
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INIT_LIST_HEAD(&neh->list_node);
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init_timer(&neh->timer);
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neh->timer.function = uwb_rc_neh_timer;
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neh->timer.data = (unsigned long)neh;
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neh->rc = rc;
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neh->evt_type = expected_type;
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neh->evt = cpu_to_le16(expected_event);
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neh->cb = cb;
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neh->arg = arg;
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spin_lock_irqsave(&rc->neh_lock, flags);
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result = __uwb_rc_ctx_get(rc, neh);
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if (result >= 0) {
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cmd->bCommandContext = neh->context;
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list_add_tail(&neh->list_node, &rc->neh_list);
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uwb_rc_neh_get(neh);
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}
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spin_unlock_irqrestore(&rc->neh_lock, flags);
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if (result < 0)
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goto error_ctx_get;
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return neh;
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error_ctx_get:
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kfree(neh);
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error_kzalloc:
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dev_err(dev, "cannot open handle to radio controller: %d\n", result);
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return ERR_PTR(result);
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}
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static void __uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
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{
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__uwb_rc_ctx_put(rc, neh);
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list_del(&neh->list_node);
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}
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/**
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* uwb_rc_neh_rm - remove a neh.
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* @rc: the radio controller
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* @neh: the neh to remove
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*
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* Remove an active neh immediately instead of waiting for the event
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* (or a time out).
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*/
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void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
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{
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unsigned long flags;
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spin_lock_irqsave(&rc->neh_lock, flags);
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__uwb_rc_neh_rm(rc, neh);
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spin_unlock_irqrestore(&rc->neh_lock, flags);
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del_timer_sync(&neh->timer);
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uwb_rc_neh_put(neh);
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}
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/**
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* uwb_rc_neh_arm - arm an event handler timeout timer
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*
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* @rc: UWB Radio Controller
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* @neh: Notification/event handler for @rc
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*
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* The timer is only armed if the neh is active.
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*/
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void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
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{
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unsigned long flags;
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spin_lock_irqsave(&rc->neh_lock, flags);
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if (neh->context)
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mod_timer(&neh->timer,
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jiffies + msecs_to_jiffies(UWB_RC_CMD_TIMEOUT_MS));
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spin_unlock_irqrestore(&rc->neh_lock, flags);
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}
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static void uwb_rc_neh_cb(struct uwb_rc_neh *neh, struct uwb_rceb *rceb, size_t size)
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{
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(*neh->cb)(neh->rc, neh->arg, rceb, size);
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uwb_rc_neh_put(neh);
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}
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static bool uwb_rc_neh_match(struct uwb_rc_neh *neh, const struct uwb_rceb *rceb)
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{
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return neh->evt_type == rceb->bEventType
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&& neh->evt == rceb->wEvent
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&& neh->context == rceb->bEventContext;
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}
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/**
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* Find the handle waiting for a RC Radio Control Event
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*
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* @rc: UWB Radio Controller
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* @rceb: Pointer to the RCEB buffer
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* @event_size: Pointer to the size of the RCEB buffer. Might be
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* adjusted to take into account the @neh->extra_size
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* settings.
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*
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* If the listener has no buffer (NULL buffer), one is allocated for
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* the right size (the amount of data received). @neh->ptr will point
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* to the event payload, which always starts with a 'struct
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* uwb_rceb'. kfree() it when done.
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*/
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static
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struct uwb_rc_neh *uwb_rc_neh_lookup(struct uwb_rc *rc,
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const struct uwb_rceb *rceb)
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{
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struct uwb_rc_neh *neh = NULL, *h;
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unsigned long flags;
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spin_lock_irqsave(&rc->neh_lock, flags);
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list_for_each_entry(h, &rc->neh_list, list_node) {
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if (uwb_rc_neh_match(h, rceb)) {
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neh = h;
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break;
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}
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}
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if (neh)
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__uwb_rc_neh_rm(rc, neh);
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spin_unlock_irqrestore(&rc->neh_lock, flags);
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return neh;
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}
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/*
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* Process notifications coming from the radio control interface
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*
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* @rc: UWB Radio Control Interface descriptor
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* @neh: Notification/Event Handler @neh->ptr points to
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* @uwb_evt->buffer.
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*
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* This function is called by the event/notif handling subsystem when
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* notifications arrive (hwarc_probe() arms a notification/event handle
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* that calls back this function for every received notification; this
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* function then will rearm itself).
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*
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* Notification data buffers are dynamically allocated by the NEH
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* handling code in neh.c [uwb_rc_neh_lookup()]. What is actually
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* allocated is space to contain the notification data.
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*
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* Buffers are prefixed with a Radio Control Event Block (RCEB) as
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* defined by the WUSB Wired-Adapter Radio Control interface. We
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* just use it for the notification code.
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*
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* On each case statement we just transcode endianess of the different
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* fields. We declare a pointer to a RCI definition of an event, and
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* then to a UWB definition of the same event (which are the same,
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* remember). Event if we use different pointers
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*/
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static
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void uwb_rc_notif(struct uwb_rc *rc, struct uwb_rceb *rceb, ssize_t size)
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{
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struct device *dev = &rc->uwb_dev.dev;
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struct uwb_event *uwb_evt;
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if (size == -ESHUTDOWN)
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return;
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if (size < 0) {
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dev_err(dev, "ignoring event with error code %zu\n",
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size);
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return;
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}
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uwb_evt = kzalloc(sizeof(*uwb_evt), GFP_ATOMIC);
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if (unlikely(uwb_evt == NULL)) {
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dev_err(dev, "no memory to queue event 0x%02x/%04x/%02x\n",
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rceb->bEventType, le16_to_cpu(rceb->wEvent),
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rceb->bEventContext);
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return;
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}
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uwb_evt->rc = __uwb_rc_get(rc); /* will be put by uwbd's uwbd_event_handle() */
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uwb_evt->ts_jiffies = jiffies;
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uwb_evt->type = UWB_EVT_TYPE_NOTIF;
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uwb_evt->notif.size = size;
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uwb_evt->notif.rceb = rceb;
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uwbd_event_queue(uwb_evt);
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}
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static void uwb_rc_neh_grok_event(struct uwb_rc *rc, struct uwb_rceb *rceb, size_t size)
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{
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struct device *dev = &rc->uwb_dev.dev;
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struct uwb_rc_neh *neh;
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struct uwb_rceb *notif;
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unsigned long flags;
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if (rceb->bEventContext == 0) {
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notif = kmalloc(size, GFP_ATOMIC);
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if (notif) {
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memcpy(notif, rceb, size);
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uwb_rc_notif(rc, notif, size);
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} else
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dev_err(dev, "event 0x%02x/%04x/%02x (%zu bytes): no memory\n",
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rceb->bEventType, le16_to_cpu(rceb->wEvent),
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rceb->bEventContext, size);
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} else {
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neh = uwb_rc_neh_lookup(rc, rceb);
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if (neh) {
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spin_lock_irqsave(&rc->neh_lock, flags);
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/* to guard against a timeout */
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neh->completed = 1;
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del_timer(&neh->timer);
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spin_unlock_irqrestore(&rc->neh_lock, flags);
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uwb_rc_neh_cb(neh, rceb, size);
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} else
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dev_warn(dev, "event 0x%02x/%04x/%02x (%zu bytes): nobody cared\n",
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rceb->bEventType, le16_to_cpu(rceb->wEvent),
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rceb->bEventContext, size);
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}
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}
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/**
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* Given a buffer with one or more UWB RC events/notifications, break
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* them up and dispatch them.
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*
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* @rc: UWB Radio Controller
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* @buf: Buffer with the stream of notifications/events
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* @buf_size: Amount of data in the buffer
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*
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* Note each notification/event starts always with a 'struct
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* uwb_rceb', so the minimum size if 4 bytes.
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*
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* The device may pass us events formatted differently than expected.
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* These are first filtered, potentially creating a new event in a new
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* memory location. If a new event is created by the filter it is also
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* freed here.
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*
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* For each notif/event, tries to guess the size looking at the EST
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* tables, then looks for a neh that is waiting for that event and if
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* found, copies the payload to the neh's buffer and calls it back. If
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* not, the data is ignored.
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*
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* Note that if we can't find a size description in the EST tables, we
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* still might find a size in the 'neh' handle in uwb_rc_neh_lookup().
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*
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* Assumptions:
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*
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* @rc->neh_lock is NOT taken
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*
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* We keep track of various sizes here:
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* size: contains the size of the buffer that is processed for the
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* incoming event. this buffer may contain events that are not
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* formatted as WHCI.
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* real_size: the actual space taken by this event in the buffer.
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* We need to keep track of the real size of an event to be able to
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* advance the buffer correctly.
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* event_size: the size of the event as expected by the core layer
|
|
* [OR] the size of the event after filtering. if the filtering
|
|
* created a new event in a new memory location then this is
|
|
* effectively the size of a new event buffer
|
|
*/
|
|
void uwb_rc_neh_grok(struct uwb_rc *rc, void *buf, size_t buf_size)
|
|
{
|
|
struct device *dev = &rc->uwb_dev.dev;
|
|
void *itr;
|
|
struct uwb_rceb *rceb;
|
|
size_t size, real_size, event_size;
|
|
int needtofree;
|
|
|
|
itr = buf;
|
|
size = buf_size;
|
|
while (size > 0) {
|
|
if (size < sizeof(*rceb)) {
|
|
dev_err(dev, "not enough data in event buffer to "
|
|
"process incoming events (%zu left, minimum is "
|
|
"%zu)\n", size, sizeof(*rceb));
|
|
break;
|
|
}
|
|
|
|
rceb = itr;
|
|
if (rc->filter_event) {
|
|
needtofree = rc->filter_event(rc, &rceb, size,
|
|
&real_size, &event_size);
|
|
if (needtofree < 0 && needtofree != -ENOANO) {
|
|
dev_err(dev, "BUG: Unable to filter event "
|
|
"(0x%02x/%04x/%02x) from "
|
|
"device. \n", rceb->bEventType,
|
|
le16_to_cpu(rceb->wEvent),
|
|
rceb->bEventContext);
|
|
break;
|
|
}
|
|
} else
|
|
needtofree = -ENOANO;
|
|
/* do real processing if there was no filtering or the
|
|
* filtering didn't act */
|
|
if (needtofree == -ENOANO) {
|
|
ssize_t ret = uwb_est_find_size(rc, rceb, size);
|
|
if (ret < 0)
|
|
break;
|
|
if (ret > size) {
|
|
dev_err(dev, "BUG: hw sent incomplete event "
|
|
"0x%02x/%04x/%02x (%zd bytes), only got "
|
|
"%zu bytes. We don't handle that.\n",
|
|
rceb->bEventType, le16_to_cpu(rceb->wEvent),
|
|
rceb->bEventContext, ret, size);
|
|
break;
|
|
}
|
|
real_size = event_size = ret;
|
|
}
|
|
uwb_rc_neh_grok_event(rc, rceb, event_size);
|
|
|
|
if (needtofree == 1)
|
|
kfree(rceb);
|
|
|
|
itr += real_size;
|
|
size -= real_size;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_rc_neh_grok);
|
|
|
|
|
|
/**
|
|
* The entity that reads from the device notification/event channel has
|
|
* detected an error.
|
|
*
|
|
* @rc: UWB Radio Controller
|
|
* @error: Errno error code
|
|
*
|
|
*/
|
|
void uwb_rc_neh_error(struct uwb_rc *rc, int error)
|
|
{
|
|
struct uwb_rc_neh *neh;
|
|
unsigned long flags;
|
|
|
|
for (;;) {
|
|
spin_lock_irqsave(&rc->neh_lock, flags);
|
|
if (list_empty(&rc->neh_list)) {
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
break;
|
|
}
|
|
neh = list_first_entry(&rc->neh_list, struct uwb_rc_neh, list_node);
|
|
__uwb_rc_neh_rm(rc, neh);
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
|
|
del_timer_sync(&neh->timer);
|
|
uwb_rc_neh_cb(neh, NULL, error);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_rc_neh_error);
|
|
|
|
|
|
static void uwb_rc_neh_timer(unsigned long arg)
|
|
{
|
|
struct uwb_rc_neh *neh = (struct uwb_rc_neh *)arg;
|
|
struct uwb_rc *rc = neh->rc;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&rc->neh_lock, flags);
|
|
if (neh->completed) {
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
return;
|
|
}
|
|
if (neh->context)
|
|
__uwb_rc_neh_rm(rc, neh);
|
|
else
|
|
neh = NULL;
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
|
|
if (neh)
|
|
uwb_rc_neh_cb(neh, NULL, -ETIMEDOUT);
|
|
}
|
|
|
|
/** Initializes the @rc's neh subsystem
|
|
*/
|
|
void uwb_rc_neh_create(struct uwb_rc *rc)
|
|
{
|
|
spin_lock_init(&rc->neh_lock);
|
|
INIT_LIST_HEAD(&rc->neh_list);
|
|
set_bit(0, rc->ctx_bm); /* 0 is reserved (see [WUSB] table 8-65) */
|
|
set_bit(0xff, rc->ctx_bm); /* and 0xff is invalid */
|
|
rc->ctx_roll = 1;
|
|
}
|
|
|
|
|
|
/** Release's the @rc's neh subsystem */
|
|
void uwb_rc_neh_destroy(struct uwb_rc *rc)
|
|
{
|
|
unsigned long flags;
|
|
struct uwb_rc_neh *neh;
|
|
|
|
for (;;) {
|
|
spin_lock_irqsave(&rc->neh_lock, flags);
|
|
if (list_empty(&rc->neh_list)) {
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
break;
|
|
}
|
|
neh = list_first_entry(&rc->neh_list, struct uwb_rc_neh, list_node);
|
|
__uwb_rc_neh_rm(rc, neh);
|
|
spin_unlock_irqrestore(&rc->neh_lock, flags);
|
|
|
|
del_timer_sync(&neh->timer);
|
|
uwb_rc_neh_put(neh);
|
|
}
|
|
}
|