b5d2a5e04e
fw_device.node_id and fw_device.generation are accessed without mutexes. We have to ensure that all readers will get to see node_id updates before generation updates. Fixes an inability to recognize devices after "giving up on config rom", https://bugzilla.redhat.com/show_bug.cgi?id=429950 Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Reviewed by Nick Piggin <nickpiggin@yahoo.com.au>. Verified to fix 'giving up on config rom' issues on multiple system and drive combinations that were previously affected. Signed-off-by: Jarod Wilson <jwilson@redhat.com> Signed-off-by: Kristian Høgsberg <krh@redhat.com>
156 lines
4.0 KiB
C
156 lines
4.0 KiB
C
/*
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* Copyright (C) 2005-2006 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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#ifndef __fw_device_h
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#define __fw_device_h
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <asm/atomic.h>
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enum fw_device_state {
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FW_DEVICE_INITIALIZING,
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FW_DEVICE_RUNNING,
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FW_DEVICE_SHUTDOWN,
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};
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struct fw_attribute_group {
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struct attribute_group *groups[2];
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struct attribute_group group;
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struct attribute *attrs[11];
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};
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/*
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* Note, fw_device.generation always has to be read before fw_device.node_id.
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* Use SMP memory barriers to ensure this. Otherwise requests will be sent
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* to an outdated node_id if the generation was updated in the meantime due
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* to a bus reset.
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*
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* Likewise, fw-core will take care to update .node_id before .generation so
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* that whenever fw_device.generation is current WRT the actual bus generation,
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* fw_device.node_id is guaranteed to be current too.
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*
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* The same applies to fw_device.card->node_id vs. fw_device.generation.
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*/
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struct fw_device {
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atomic_t state;
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struct fw_node *node;
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int node_id;
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int generation;
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unsigned max_speed;
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struct fw_card *card;
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struct device device;
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struct list_head link;
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struct list_head client_list;
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u32 *config_rom;
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size_t config_rom_length;
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int config_rom_retries;
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struct delayed_work work;
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struct fw_attribute_group attribute_group;
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};
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static inline struct fw_device *
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fw_device(struct device *dev)
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{
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return container_of(dev, struct fw_device, device);
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}
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static inline int
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fw_device_is_shutdown(struct fw_device *device)
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{
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return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
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}
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struct fw_device *fw_device_get(struct fw_device *device);
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void fw_device_put(struct fw_device *device);
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int fw_device_enable_phys_dma(struct fw_device *device);
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void fw_device_cdev_update(struct fw_device *device);
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void fw_device_cdev_remove(struct fw_device *device);
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struct fw_device *fw_device_from_devt(dev_t devt);
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extern int fw_cdev_major;
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struct fw_unit {
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struct device device;
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u32 *directory;
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struct fw_attribute_group attribute_group;
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};
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static inline struct fw_unit *
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fw_unit(struct device *dev)
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{
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return container_of(dev, struct fw_unit, device);
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}
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#define CSR_OFFSET 0x40
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#define CSR_LEAF 0x80
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#define CSR_DIRECTORY 0xc0
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#define CSR_DESCRIPTOR 0x01
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#define CSR_VENDOR 0x03
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#define CSR_HARDWARE_VERSION 0x04
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#define CSR_NODE_CAPABILITIES 0x0c
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#define CSR_UNIT 0x11
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#define CSR_SPECIFIER_ID 0x12
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#define CSR_VERSION 0x13
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#define CSR_DEPENDENT_INFO 0x14
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#define CSR_MODEL 0x17
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#define CSR_INSTANCE 0x18
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#define CSR_DIRECTORY_ID 0x20
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struct fw_csr_iterator {
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u32 *p;
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u32 *end;
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};
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void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
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int fw_csr_iterator_next(struct fw_csr_iterator *ci,
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int *key, int *value);
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#define FW_MATCH_VENDOR 0x0001
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#define FW_MATCH_MODEL 0x0002
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#define FW_MATCH_SPECIFIER_ID 0x0004
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#define FW_MATCH_VERSION 0x0008
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struct fw_device_id {
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u32 match_flags;
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u32 vendor;
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u32 model;
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u32 specifier_id;
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u32 version;
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void *driver_data;
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};
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struct fw_driver {
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struct device_driver driver;
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/* Called when the parent device sits through a bus reset. */
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void (*update) (struct fw_unit *unit);
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const struct fw_device_id *id_table;
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};
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static inline struct fw_driver *
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fw_driver(struct device_driver *drv)
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{
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return container_of(drv, struct fw_driver, driver);
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}
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extern const struct file_operations fw_device_ops;
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#endif /* __fw_device_h */
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