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>
155 lines
4 KiB
C
155 lines
4 KiB
C
/*
|
|
* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifndef __fw_device_h
|
|
#define __fw_device_h
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/cdev.h>
|
|
#include <asm/atomic.h>
|
|
|
|
enum fw_device_state {
|
|
FW_DEVICE_INITIALIZING,
|
|
FW_DEVICE_RUNNING,
|
|
FW_DEVICE_SHUTDOWN,
|
|
};
|
|
|
|
struct fw_attribute_group {
|
|
struct attribute_group *groups[2];
|
|
struct attribute_group group;
|
|
struct attribute *attrs[11];
|
|
};
|
|
|
|
/*
|
|
* Note, fw_device.generation always has to be read before fw_device.node_id.
|
|
* Use SMP memory barriers to ensure this. Otherwise requests will be sent
|
|
* to an outdated node_id if the generation was updated in the meantime due
|
|
* to a bus reset.
|
|
*
|
|
* Likewise, fw-core will take care to update .node_id before .generation so
|
|
* that whenever fw_device.generation is current WRT the actual bus generation,
|
|
* fw_device.node_id is guaranteed to be current too.
|
|
*
|
|
* The same applies to fw_device.card->node_id vs. fw_device.generation.
|
|
*/
|
|
struct fw_device {
|
|
atomic_t state;
|
|
struct fw_node *node;
|
|
int node_id;
|
|
int generation;
|
|
unsigned max_speed;
|
|
struct fw_card *card;
|
|
struct device device;
|
|
struct list_head link;
|
|
struct list_head client_list;
|
|
u32 *config_rom;
|
|
size_t config_rom_length;
|
|
int config_rom_retries;
|
|
struct delayed_work work;
|
|
struct fw_attribute_group attribute_group;
|
|
};
|
|
|
|
static inline struct fw_device *
|
|
fw_device(struct device *dev)
|
|
{
|
|
return container_of(dev, struct fw_device, device);
|
|
}
|
|
|
|
static inline int
|
|
fw_device_is_shutdown(struct fw_device *device)
|
|
{
|
|
return atomic_read(&device->state) == FW_DEVICE_SHUTDOWN;
|
|
}
|
|
|
|
struct fw_device *fw_device_get(struct fw_device *device);
|
|
void fw_device_put(struct fw_device *device);
|
|
int fw_device_enable_phys_dma(struct fw_device *device);
|
|
|
|
void fw_device_cdev_update(struct fw_device *device);
|
|
void fw_device_cdev_remove(struct fw_device *device);
|
|
|
|
struct fw_device *fw_device_from_devt(dev_t devt);
|
|
extern int fw_cdev_major;
|
|
|
|
struct fw_unit {
|
|
struct device device;
|
|
u32 *directory;
|
|
struct fw_attribute_group attribute_group;
|
|
};
|
|
|
|
static inline struct fw_unit *
|
|
fw_unit(struct device *dev)
|
|
{
|
|
return container_of(dev, struct fw_unit, device);
|
|
}
|
|
|
|
#define CSR_OFFSET 0x40
|
|
#define CSR_LEAF 0x80
|
|
#define CSR_DIRECTORY 0xc0
|
|
|
|
#define CSR_DESCRIPTOR 0x01
|
|
#define CSR_VENDOR 0x03
|
|
#define CSR_HARDWARE_VERSION 0x04
|
|
#define CSR_NODE_CAPABILITIES 0x0c
|
|
#define CSR_UNIT 0x11
|
|
#define CSR_SPECIFIER_ID 0x12
|
|
#define CSR_VERSION 0x13
|
|
#define CSR_DEPENDENT_INFO 0x14
|
|
#define CSR_MODEL 0x17
|
|
#define CSR_INSTANCE 0x18
|
|
#define CSR_DIRECTORY_ID 0x20
|
|
|
|
struct fw_csr_iterator {
|
|
u32 *p;
|
|
u32 *end;
|
|
};
|
|
|
|
void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
|
|
int fw_csr_iterator_next(struct fw_csr_iterator *ci,
|
|
int *key, int *value);
|
|
|
|
#define FW_MATCH_VENDOR 0x0001
|
|
#define FW_MATCH_MODEL 0x0002
|
|
#define FW_MATCH_SPECIFIER_ID 0x0004
|
|
#define FW_MATCH_VERSION 0x0008
|
|
|
|
struct fw_device_id {
|
|
u32 match_flags;
|
|
u32 vendor;
|
|
u32 model;
|
|
u32 specifier_id;
|
|
u32 version;
|
|
void *driver_data;
|
|
};
|
|
|
|
struct fw_driver {
|
|
struct device_driver driver;
|
|
/* Called when the parent device sits through a bus reset. */
|
|
void (*update) (struct fw_unit *unit);
|
|
const struct fw_device_id *id_table;
|
|
};
|
|
|
|
static inline struct fw_driver *
|
|
fw_driver(struct device_driver *drv)
|
|
{
|
|
return container_of(drv, struct fw_driver, driver);
|
|
}
|
|
|
|
extern const struct file_operations fw_device_ops;
|
|
|
|
#endif /* __fw_device_h */
|