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![Linus Torvalds](/assets/img/avatar_default.png)
- Fix mismatch between DMA mapping direction (was wrong) and DMA synchronization direction (was correct) of isochronous reception buffers of userspace drivers if vma-mapped for R/W access. For example, libdc1394 was affected. - more consistent retry stategy in device discovery/ rediscovery, and improved failure diagnostics - various small cleanups, e.g. use SCSI layer's DMA mapping API in firewire-sbp2 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) iQIcBAABAgAGBQJPvoOWAAoJEHnzb7JUXXnQpG4P/j4u9kU+MDegDrRsAzZBdP+6 in2FW8opUzSXZyLSzU/JYcO7P0luEEdLIE65fkaVRbP1x6m7aAjgaAO/0zbqZQPD QVyIAOPa8zcbEIi1cEnI75KU/AMyQpMk/eU9Et4FrbQszgyFvJNe+hS+MocMooPt vukqmWJuIPfH/G3FsX0eQWEXS7GktkYxmLJM/k6z4JpngAVmelM/Ce45VFg7tbN+ IeV5N7+FF4zKmwgiKIpkw5tSO6If7mjoQQVH/Q8DiHJDhFlDUrKR9/TvaJesVtEg 5n97BbfvXc8mu6EE8lbl1ats2R1I00JDpMylHPt4J6G1XDjb1/GvqSjXYXwPT77J O4xZwqT4C5JKnG9h2a4npf6PgDHBbMnUK9cDBxfA5ZPkTeZmGXWuP05zYJqeNJm9 UrEusEjzEEspVWFqxOD+2/YLF/0rxqA/P1C7Luuw7Y9nIcCt3VskuW6iebYuf5Dk yNoykYVph8zDJE+Am7jtsgNCPfd4TomFttjMcc/0EVqNa1iVO/AuLlvYv+Ab75oU BpOUEg8Pq9nQeya3XjM585R0rF4PG5wsVrBe2ZzJ+cqNe6JH264/YuBgFv1bkUg3 UtHNIG633KAk71P1jl7PeuvAQksLnCYak2JOviZ/oB79Yamoxifhcm4mNkwTeCv7 paRqDNAzoaThqvqx723E =fulr -----END PGP SIGNATURE----- Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 Pull IEEE 1394 (FireWire) subsystem updates from Stefan Richter: - Fix mismatch between DMA mapping direction (was wrong) and DMA synchronization direction (was correct) of isochronous reception buffers of userspace drivers if vma-mapped for R/W access. For example, libdc1394 was affected. - more consistent retry stategy in device discovery/ rediscovery, and improved failure diagnostics - various small cleanups, e.g. use SCSI layer's DMA mapping API in firewire-sbp2 * tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: firewire: sbp2: document the absence of alignment requirements firewire: sbp2: remove superfluous blk_queue_max_segment_size() call firewire: sbp2: use scsi_dma_(un)map firewire: sbp2: give correct DMA device to scsi framework firewire: core: fw_device_refresh(): clean up error handling firewire: core: log config rom reading errors firewire: core: log error in case of failed bus manager lock firewire: move rcode_string() to core firewire: core: improve reread_config_rom() interface firewire: core: wait for inaccessible devices after bus reset firewire: ohci: omit spinlock IRQ flags where possible firewire: ohci: correct signedness of a local variable firewire: core: fix DMA mapping direction firewire: use module_pci_driver
706 lines
20 KiB
C
706 lines
20 KiB
C
/*
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* Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/bug.h>
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#include <linux/completion.h>
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#include <linux/crc-itu-t.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/firewire.h>
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#include <linux/firewire-constants.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/atomic.h>
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#include <asm/byteorder.h>
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#include "core.h"
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#define define_fw_printk_level(func, kern_level) \
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void func(const struct fw_card *card, const char *fmt, ...) \
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{ \
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struct va_format vaf; \
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va_list args; \
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\
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va_start(args, fmt); \
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vaf.fmt = fmt; \
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vaf.va = &args; \
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printk(kern_level KBUILD_MODNAME " %s: %pV", \
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dev_name(card->device), &vaf); \
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va_end(args); \
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}
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define_fw_printk_level(fw_err, KERN_ERR);
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define_fw_printk_level(fw_notice, KERN_NOTICE);
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int fw_compute_block_crc(__be32 *block)
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{
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int length;
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u16 crc;
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length = (be32_to_cpu(block[0]) >> 16) & 0xff;
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crc = crc_itu_t(0, (u8 *)&block[1], length * 4);
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*block |= cpu_to_be32(crc);
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return length;
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}
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static DEFINE_MUTEX(card_mutex);
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static LIST_HEAD(card_list);
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static LIST_HEAD(descriptor_list);
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static int descriptor_count;
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static __be32 tmp_config_rom[256];
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/* ROM header, bus info block, root dir header, capabilities = 7 quadlets */
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static size_t config_rom_length = 1 + 4 + 1 + 1;
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#define BIB_CRC(v) ((v) << 0)
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#define BIB_CRC_LENGTH(v) ((v) << 16)
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#define BIB_INFO_LENGTH(v) ((v) << 24)
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#define BIB_BUS_NAME 0x31333934 /* "1394" */
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#define BIB_LINK_SPEED(v) ((v) << 0)
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#define BIB_GENERATION(v) ((v) << 4)
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#define BIB_MAX_ROM(v) ((v) << 8)
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#define BIB_MAX_RECEIVE(v) ((v) << 12)
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#define BIB_CYC_CLK_ACC(v) ((v) << 16)
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#define BIB_PMC ((1) << 27)
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#define BIB_BMC ((1) << 28)
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#define BIB_ISC ((1) << 29)
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#define BIB_CMC ((1) << 30)
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#define BIB_IRMC ((1) << 31)
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#define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */
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/*
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* IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms),
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* but we have to make it longer because there are many devices whose firmware
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* is just too slow for that.
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*/
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#define DEFAULT_SPLIT_TIMEOUT (2 * 8000)
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#define CANON_OUI 0x000085
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static void generate_config_rom(struct fw_card *card, __be32 *config_rom)
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{
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struct fw_descriptor *desc;
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int i, j, k, length;
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/*
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* Initialize contents of config rom buffer. On the OHCI
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* controller, block reads to the config rom accesses the host
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* memory, but quadlet read access the hardware bus info block
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* registers. That's just crack, but it means we should make
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* sure the contents of bus info block in host memory matches
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* the version stored in the OHCI registers.
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*/
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config_rom[0] = cpu_to_be32(
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BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
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config_rom[1] = cpu_to_be32(BIB_BUS_NAME);
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config_rom[2] = cpu_to_be32(
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BIB_LINK_SPEED(card->link_speed) |
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BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
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BIB_MAX_ROM(2) |
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BIB_MAX_RECEIVE(card->max_receive) |
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BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC);
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config_rom[3] = cpu_to_be32(card->guid >> 32);
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config_rom[4] = cpu_to_be32(card->guid);
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/* Generate root directory. */
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config_rom[6] = cpu_to_be32(NODE_CAPABILITIES);
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i = 7;
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j = 7 + descriptor_count;
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/* Generate root directory entries for descriptors. */
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list_for_each_entry (desc, &descriptor_list, link) {
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if (desc->immediate > 0)
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config_rom[i++] = cpu_to_be32(desc->immediate);
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config_rom[i] = cpu_to_be32(desc->key | (j - i));
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i++;
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j += desc->length;
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}
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/* Update root directory length. */
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config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
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/* End of root directory, now copy in descriptors. */
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list_for_each_entry (desc, &descriptor_list, link) {
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for (k = 0; k < desc->length; k++)
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config_rom[i + k] = cpu_to_be32(desc->data[k]);
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i += desc->length;
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}
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/* Calculate CRCs for all blocks in the config rom. This
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* assumes that CRC length and info length are identical for
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* the bus info block, which is always the case for this
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* implementation. */
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for (i = 0; i < j; i += length + 1)
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length = fw_compute_block_crc(config_rom + i);
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WARN_ON(j != config_rom_length);
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}
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static void update_config_roms(void)
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{
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struct fw_card *card;
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list_for_each_entry (card, &card_list, link) {
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generate_config_rom(card, tmp_config_rom);
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card->driver->set_config_rom(card, tmp_config_rom,
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config_rom_length);
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}
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}
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static size_t required_space(struct fw_descriptor *desc)
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{
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/* descriptor + entry into root dir + optional immediate entry */
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return desc->length + 1 + (desc->immediate > 0 ? 1 : 0);
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}
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int fw_core_add_descriptor(struct fw_descriptor *desc)
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{
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size_t i;
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int ret;
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/*
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* Check descriptor is valid; the length of all blocks in the
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* descriptor has to add up to exactly the length of the
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* block.
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*/
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i = 0;
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while (i < desc->length)
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i += (desc->data[i] >> 16) + 1;
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if (i != desc->length)
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return -EINVAL;
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mutex_lock(&card_mutex);
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if (config_rom_length + required_space(desc) > 256) {
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ret = -EBUSY;
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} else {
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list_add_tail(&desc->link, &descriptor_list);
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config_rom_length += required_space(desc);
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descriptor_count++;
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if (desc->immediate > 0)
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descriptor_count++;
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update_config_roms();
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ret = 0;
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}
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mutex_unlock(&card_mutex);
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return ret;
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}
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EXPORT_SYMBOL(fw_core_add_descriptor);
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void fw_core_remove_descriptor(struct fw_descriptor *desc)
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{
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mutex_lock(&card_mutex);
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list_del(&desc->link);
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config_rom_length -= required_space(desc);
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descriptor_count--;
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if (desc->immediate > 0)
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descriptor_count--;
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update_config_roms();
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mutex_unlock(&card_mutex);
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}
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EXPORT_SYMBOL(fw_core_remove_descriptor);
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static int reset_bus(struct fw_card *card, bool short_reset)
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{
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int reg = short_reset ? 5 : 1;
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int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
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return card->driver->update_phy_reg(card, reg, 0, bit);
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}
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void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset)
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{
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/* We don't try hard to sort out requests of long vs. short resets. */
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card->br_short = short_reset;
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/* Use an arbitrary short delay to combine multiple reset requests. */
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fw_card_get(card);
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if (!queue_delayed_work(fw_workqueue, &card->br_work,
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delayed ? DIV_ROUND_UP(HZ, 100) : 0))
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fw_card_put(card);
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}
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EXPORT_SYMBOL(fw_schedule_bus_reset);
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static void br_work(struct work_struct *work)
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{
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struct fw_card *card = container_of(work, struct fw_card, br_work.work);
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/* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */
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if (card->reset_jiffies != 0 &&
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time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) {
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if (!queue_delayed_work(fw_workqueue, &card->br_work, 2 * HZ))
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fw_card_put(card);
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return;
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}
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fw_send_phy_config(card, FW_PHY_CONFIG_NO_NODE_ID, card->generation,
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FW_PHY_CONFIG_CURRENT_GAP_COUNT);
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reset_bus(card, card->br_short);
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fw_card_put(card);
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}
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static void allocate_broadcast_channel(struct fw_card *card, int generation)
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{
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int channel, bandwidth = 0;
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if (!card->broadcast_channel_allocated) {
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fw_iso_resource_manage(card, generation, 1ULL << 31,
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&channel, &bandwidth, true);
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if (channel != 31) {
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fw_notice(card, "failed to allocate broadcast channel\n");
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return;
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}
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card->broadcast_channel_allocated = true;
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}
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device_for_each_child(card->device, (void *)(long)generation,
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fw_device_set_broadcast_channel);
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}
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static const char gap_count_table[] = {
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63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
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};
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void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
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{
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fw_card_get(card);
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if (!schedule_delayed_work(&card->bm_work, delay))
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fw_card_put(card);
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}
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static void bm_work(struct work_struct *work)
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{
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struct fw_card *card = container_of(work, struct fw_card, bm_work.work);
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struct fw_device *root_device, *irm_device;
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struct fw_node *root_node;
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int root_id, new_root_id, irm_id, bm_id, local_id;
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int gap_count, generation, grace, rcode;
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bool do_reset = false;
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bool root_device_is_running;
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bool root_device_is_cmc;
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bool irm_is_1394_1995_only;
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bool keep_this_irm;
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__be32 transaction_data[2];
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spin_lock_irq(&card->lock);
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if (card->local_node == NULL) {
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spin_unlock_irq(&card->lock);
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goto out_put_card;
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}
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generation = card->generation;
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root_node = card->root_node;
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fw_node_get(root_node);
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root_device = root_node->data;
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root_device_is_running = root_device &&
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atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
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root_device_is_cmc = root_device && root_device->cmc;
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irm_device = card->irm_node->data;
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irm_is_1394_1995_only = irm_device && irm_device->config_rom &&
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(irm_device->config_rom[2] & 0x000000f0) == 0;
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/* Canon MV5i works unreliably if it is not root node. */
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keep_this_irm = irm_device && irm_device->config_rom &&
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irm_device->config_rom[3] >> 8 == CANON_OUI;
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root_id = root_node->node_id;
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irm_id = card->irm_node->node_id;
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local_id = card->local_node->node_id;
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grace = time_after64(get_jiffies_64(),
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card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
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if ((is_next_generation(generation, card->bm_generation) &&
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!card->bm_abdicate) ||
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(card->bm_generation != generation && grace)) {
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/*
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* This first step is to figure out who is IRM and
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* then try to become bus manager. If the IRM is not
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* well defined (e.g. does not have an active link
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* layer or does not responds to our lock request, we
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* will have to do a little vigilante bus management.
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* In that case, we do a goto into the gap count logic
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* so that when we do the reset, we still optimize the
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* gap count. That could well save a reset in the
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* next generation.
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*/
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if (!card->irm_node->link_on) {
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new_root_id = local_id;
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fw_notice(card, "%s, making local node (%02x) root\n",
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"IRM has link off", new_root_id);
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goto pick_me;
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}
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if (irm_is_1394_1995_only && !keep_this_irm) {
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new_root_id = local_id;
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fw_notice(card, "%s, making local node (%02x) root\n",
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"IRM is not 1394a compliant", new_root_id);
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goto pick_me;
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}
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transaction_data[0] = cpu_to_be32(0x3f);
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transaction_data[1] = cpu_to_be32(local_id);
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spin_unlock_irq(&card->lock);
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rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
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irm_id, generation, SCODE_100,
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CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
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transaction_data, 8);
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if (rcode == RCODE_GENERATION)
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/* Another bus reset, BM work has been rescheduled. */
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goto out;
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bm_id = be32_to_cpu(transaction_data[0]);
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spin_lock_irq(&card->lock);
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if (rcode == RCODE_COMPLETE && generation == card->generation)
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card->bm_node_id =
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bm_id == 0x3f ? local_id : 0xffc0 | bm_id;
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spin_unlock_irq(&card->lock);
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if (rcode == RCODE_COMPLETE && bm_id != 0x3f) {
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/* Somebody else is BM. Only act as IRM. */
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if (local_id == irm_id)
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allocate_broadcast_channel(card, generation);
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goto out;
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}
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if (rcode == RCODE_SEND_ERROR) {
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/*
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* We have been unable to send the lock request due to
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* some local problem. Let's try again later and hope
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* that the problem has gone away by then.
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*/
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fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
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goto out;
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}
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spin_lock_irq(&card->lock);
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|
|
if (rcode != RCODE_COMPLETE && !keep_this_irm) {
|
|
/*
|
|
* The lock request failed, maybe the IRM
|
|
* isn't really IRM capable after all. Let's
|
|
* do a bus reset and pick the local node as
|
|
* root, and thus, IRM.
|
|
*/
|
|
new_root_id = local_id;
|
|
fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n",
|
|
fw_rcode_string(rcode), new_root_id);
|
|
goto pick_me;
|
|
}
|
|
} else if (card->bm_generation != generation) {
|
|
/*
|
|
* We weren't BM in the last generation, and the last
|
|
* bus reset is less than 125ms ago. Reschedule this job.
|
|
*/
|
|
spin_unlock_irq(&card->lock);
|
|
fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We're bus manager for this generation, so next step is to
|
|
* make sure we have an active cycle master and do gap count
|
|
* optimization.
|
|
*/
|
|
card->bm_generation = generation;
|
|
|
|
if (root_device == NULL) {
|
|
/*
|
|
* Either link_on is false, or we failed to read the
|
|
* config rom. In either case, pick another root.
|
|
*/
|
|
new_root_id = local_id;
|
|
} else if (!root_device_is_running) {
|
|
/*
|
|
* If we haven't probed this device yet, bail out now
|
|
* and let's try again once that's done.
|
|
*/
|
|
spin_unlock_irq(&card->lock);
|
|
goto out;
|
|
} else if (root_device_is_cmc) {
|
|
/*
|
|
* We will send out a force root packet for this
|
|
* node as part of the gap count optimization.
|
|
*/
|
|
new_root_id = root_id;
|
|
} else {
|
|
/*
|
|
* Current root has an active link layer and we
|
|
* successfully read the config rom, but it's not
|
|
* cycle master capable.
|
|
*/
|
|
new_root_id = local_id;
|
|
}
|
|
|
|
pick_me:
|
|
/*
|
|
* Pick a gap count from 1394a table E-1. The table doesn't cover
|
|
* the typically much larger 1394b beta repeater delays though.
|
|
*/
|
|
if (!card->beta_repeaters_present &&
|
|
root_node->max_hops < ARRAY_SIZE(gap_count_table))
|
|
gap_count = gap_count_table[root_node->max_hops];
|
|
else
|
|
gap_count = 63;
|
|
|
|
/*
|
|
* Finally, figure out if we should do a reset or not. If we have
|
|
* done less than 5 resets with the same physical topology and we
|
|
* have either a new root or a new gap count setting, let's do it.
|
|
*/
|
|
|
|
if (card->bm_retries++ < 5 &&
|
|
(card->gap_count != gap_count || new_root_id != root_id))
|
|
do_reset = true;
|
|
|
|
spin_unlock_irq(&card->lock);
|
|
|
|
if (do_reset) {
|
|
fw_notice(card, "phy config: new root=%x, gap_count=%d\n",
|
|
new_root_id, gap_count);
|
|
fw_send_phy_config(card, new_root_id, generation, gap_count);
|
|
reset_bus(card, true);
|
|
/* Will allocate broadcast channel after the reset. */
|
|
goto out;
|
|
}
|
|
|
|
if (root_device_is_cmc) {
|
|
/*
|
|
* Make sure that the cycle master sends cycle start packets.
|
|
*/
|
|
transaction_data[0] = cpu_to_be32(CSR_STATE_BIT_CMSTR);
|
|
rcode = fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
|
|
root_id, generation, SCODE_100,
|
|
CSR_REGISTER_BASE + CSR_STATE_SET,
|
|
transaction_data, 4);
|
|
if (rcode == RCODE_GENERATION)
|
|
goto out;
|
|
}
|
|
|
|
if (local_id == irm_id)
|
|
allocate_broadcast_channel(card, generation);
|
|
|
|
out:
|
|
fw_node_put(root_node);
|
|
out_put_card:
|
|
fw_card_put(card);
|
|
}
|
|
|
|
void fw_card_initialize(struct fw_card *card,
|
|
const struct fw_card_driver *driver,
|
|
struct device *device)
|
|
{
|
|
static atomic_t index = ATOMIC_INIT(-1);
|
|
|
|
card->index = atomic_inc_return(&index);
|
|
card->driver = driver;
|
|
card->device = device;
|
|
card->current_tlabel = 0;
|
|
card->tlabel_mask = 0;
|
|
card->split_timeout_hi = DEFAULT_SPLIT_TIMEOUT / 8000;
|
|
card->split_timeout_lo = (DEFAULT_SPLIT_TIMEOUT % 8000) << 19;
|
|
card->split_timeout_cycles = DEFAULT_SPLIT_TIMEOUT;
|
|
card->split_timeout_jiffies =
|
|
DIV_ROUND_UP(DEFAULT_SPLIT_TIMEOUT * HZ, 8000);
|
|
card->color = 0;
|
|
card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
|
|
|
|
kref_init(&card->kref);
|
|
init_completion(&card->done);
|
|
INIT_LIST_HEAD(&card->transaction_list);
|
|
INIT_LIST_HEAD(&card->phy_receiver_list);
|
|
spin_lock_init(&card->lock);
|
|
|
|
card->local_node = NULL;
|
|
|
|
INIT_DELAYED_WORK(&card->br_work, br_work);
|
|
INIT_DELAYED_WORK(&card->bm_work, bm_work);
|
|
}
|
|
EXPORT_SYMBOL(fw_card_initialize);
|
|
|
|
int fw_card_add(struct fw_card *card,
|
|
u32 max_receive, u32 link_speed, u64 guid)
|
|
{
|
|
int ret;
|
|
|
|
card->max_receive = max_receive;
|
|
card->link_speed = link_speed;
|
|
card->guid = guid;
|
|
|
|
mutex_lock(&card_mutex);
|
|
|
|
generate_config_rom(card, tmp_config_rom);
|
|
ret = card->driver->enable(card, tmp_config_rom, config_rom_length);
|
|
if (ret == 0)
|
|
list_add_tail(&card->link, &card_list);
|
|
|
|
mutex_unlock(&card_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fw_card_add);
|
|
|
|
/*
|
|
* The next few functions implement a dummy driver that is used once a card
|
|
* driver shuts down an fw_card. This allows the driver to cleanly unload,
|
|
* as all IO to the card will be handled (and failed) by the dummy driver
|
|
* instead of calling into the module. Only functions for iso context
|
|
* shutdown still need to be provided by the card driver.
|
|
*
|
|
* .read/write_csr() should never be called anymore after the dummy driver
|
|
* was bound since they are only used within request handler context.
|
|
* .set_config_rom() is never called since the card is taken out of card_list
|
|
* before switching to the dummy driver.
|
|
*/
|
|
|
|
static int dummy_read_phy_reg(struct fw_card *card, int address)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int dummy_update_phy_reg(struct fw_card *card, int address,
|
|
int clear_bits, int set_bits)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
|
|
{
|
|
packet->callback(packet, card, RCODE_CANCELLED);
|
|
}
|
|
|
|
static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
|
|
{
|
|
packet->callback(packet, card, RCODE_CANCELLED);
|
|
}
|
|
|
|
static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int dummy_enable_phys_dma(struct fw_card *card,
|
|
int node_id, int generation)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static struct fw_iso_context *dummy_allocate_iso_context(struct fw_card *card,
|
|
int type, int channel, size_t header_size)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static int dummy_start_iso(struct fw_iso_context *ctx,
|
|
s32 cycle, u32 sync, u32 tags)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p,
|
|
struct fw_iso_buffer *buffer, unsigned long payload)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void dummy_flush_queue_iso(struct fw_iso_context *ctx)
|
|
{
|
|
}
|
|
|
|
static int dummy_flush_iso_completions(struct fw_iso_context *ctx)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
|
|
static const struct fw_card_driver dummy_driver_template = {
|
|
.read_phy_reg = dummy_read_phy_reg,
|
|
.update_phy_reg = dummy_update_phy_reg,
|
|
.send_request = dummy_send_request,
|
|
.send_response = dummy_send_response,
|
|
.cancel_packet = dummy_cancel_packet,
|
|
.enable_phys_dma = dummy_enable_phys_dma,
|
|
.allocate_iso_context = dummy_allocate_iso_context,
|
|
.start_iso = dummy_start_iso,
|
|
.set_iso_channels = dummy_set_iso_channels,
|
|
.queue_iso = dummy_queue_iso,
|
|
.flush_queue_iso = dummy_flush_queue_iso,
|
|
.flush_iso_completions = dummy_flush_iso_completions,
|
|
};
|
|
|
|
void fw_card_release(struct kref *kref)
|
|
{
|
|
struct fw_card *card = container_of(kref, struct fw_card, kref);
|
|
|
|
complete(&card->done);
|
|
}
|
|
EXPORT_SYMBOL_GPL(fw_card_release);
|
|
|
|
void fw_core_remove_card(struct fw_card *card)
|
|
{
|
|
struct fw_card_driver dummy_driver = dummy_driver_template;
|
|
|
|
card->driver->update_phy_reg(card, 4,
|
|
PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
|
|
fw_schedule_bus_reset(card, false, true);
|
|
|
|
mutex_lock(&card_mutex);
|
|
list_del_init(&card->link);
|
|
mutex_unlock(&card_mutex);
|
|
|
|
/* Switch off most of the card driver interface. */
|
|
dummy_driver.free_iso_context = card->driver->free_iso_context;
|
|
dummy_driver.stop_iso = card->driver->stop_iso;
|
|
card->driver = &dummy_driver;
|
|
|
|
fw_destroy_nodes(card);
|
|
|
|
/* Wait for all users, especially device workqueue jobs, to finish. */
|
|
fw_card_put(card);
|
|
wait_for_completion(&card->done);
|
|
|
|
WARN_ON(!list_empty(&card->transaction_list));
|
|
}
|
|
EXPORT_SYMBOL(fw_core_remove_card);
|