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![Takashi Sakamoto](/assets/img/avatar_default.png)
In post commit, a quirk of this firmware about transactions is reported. This commit apply a workaround for this quirk. They often fail transactions due to gap_count mismatch. This state is changed by generating bus reset. The fw_schedule_bus_reset() is an exported symbol in firewire-core. But there are no header for public. This commit moves its prototype from drivers/firewire/core.h to include/linux/firewire.h. This mismatch still affects bus management before generating this bus reset. It still takes a time to call driver's probe() because transactions are still often failed. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
472 lines
13 KiB
C
472 lines
13 KiB
C
#ifndef _LINUX_FIREWIRE_H
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#define _LINUX_FIREWIRE_H
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.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/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/sysfs.h>
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#include <linux/timer.h>
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#include <linux/types.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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#define CSR_REGISTER_BASE 0xfffff0000000ULL
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/* register offsets are relative to CSR_REGISTER_BASE */
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#define CSR_STATE_CLEAR 0x0
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#define CSR_STATE_SET 0x4
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#define CSR_NODE_IDS 0x8
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#define CSR_RESET_START 0xc
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#define CSR_SPLIT_TIMEOUT_HI 0x18
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#define CSR_SPLIT_TIMEOUT_LO 0x1c
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#define CSR_CYCLE_TIME 0x200
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#define CSR_BUS_TIME 0x204
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#define CSR_BUSY_TIMEOUT 0x210
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#define CSR_PRIORITY_BUDGET 0x218
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#define CSR_BUS_MANAGER_ID 0x21c
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#define CSR_BANDWIDTH_AVAILABLE 0x220
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#define CSR_CHANNELS_AVAILABLE 0x224
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#define CSR_CHANNELS_AVAILABLE_HI 0x224
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#define CSR_CHANNELS_AVAILABLE_LO 0x228
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#define CSR_MAINT_UTILITY 0x230
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#define CSR_BROADCAST_CHANNEL 0x234
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#define CSR_CONFIG_ROM 0x400
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#define CSR_CONFIG_ROM_END 0x800
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#define CSR_OMPR 0x900
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#define CSR_OPCR(i) (0x904 + (i) * 4)
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#define CSR_IMPR 0x980
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#define CSR_IPCR(i) (0x984 + (i) * 4)
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#define CSR_FCP_COMMAND 0xB00
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#define CSR_FCP_RESPONSE 0xD00
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#define CSR_FCP_END 0xF00
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#define CSR_TOPOLOGY_MAP 0x1000
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#define CSR_TOPOLOGY_MAP_END 0x1400
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#define CSR_SPEED_MAP 0x2000
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#define CSR_SPEED_MAP_END 0x3000
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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_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_DIRECTORY_ID 0x20
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struct fw_csr_iterator {
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const u32 *p;
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const u32 *end;
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};
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void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p);
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int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
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int fw_csr_string(const u32 *directory, int key, char *buf, size_t size);
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extern struct bus_type fw_bus_type;
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struct fw_card_driver;
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struct fw_node;
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struct fw_card {
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const struct fw_card_driver *driver;
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struct device *device;
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struct kref kref;
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struct completion done;
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int node_id;
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int generation;
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int current_tlabel;
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u64 tlabel_mask;
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struct list_head transaction_list;
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u64 reset_jiffies;
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u32 split_timeout_hi;
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u32 split_timeout_lo;
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unsigned int split_timeout_cycles;
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unsigned int split_timeout_jiffies;
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unsigned long long guid;
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unsigned max_receive;
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int link_speed;
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int config_rom_generation;
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spinlock_t lock; /* Take this lock when handling the lists in
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* this struct. */
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struct fw_node *local_node;
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struct fw_node *root_node;
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struct fw_node *irm_node;
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u8 color; /* must be u8 to match the definition in struct fw_node */
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int gap_count;
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bool beta_repeaters_present;
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int index;
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struct list_head link;
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struct list_head phy_receiver_list;
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struct delayed_work br_work; /* bus reset job */
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bool br_short;
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struct delayed_work bm_work; /* bus manager job */
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int bm_retries;
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int bm_generation;
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int bm_node_id;
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bool bm_abdicate;
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bool priority_budget_implemented; /* controller feature */
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bool broadcast_channel_auto_allocated; /* controller feature */
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bool broadcast_channel_allocated;
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u32 broadcast_channel;
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__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
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__be32 maint_utility_register;
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};
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static inline struct fw_card *fw_card_get(struct fw_card *card)
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{
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kref_get(&card->kref);
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return card;
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}
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void fw_card_release(struct kref *kref);
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static inline void fw_card_put(struct fw_card *card)
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{
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kref_put(&card->kref, fw_card_release);
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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[13];
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};
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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_GONE,
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FW_DEVICE_SHUTDOWN,
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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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* fw_device.config_rom and fw_device.config_rom_length may be accessed during
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* the lifetime of any fw_unit belonging to the fw_device, before device_del()
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* was called on the last fw_unit. Alternatively, they may be accessed while
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* holding fw_device_rwsem.
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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 mutex client_list_mutex;
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struct list_head client_list;
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const u32 *config_rom;
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size_t config_rom_length;
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int config_rom_retries;
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unsigned is_local:1;
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unsigned max_rec:4;
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unsigned cmc:1;
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unsigned irmc:1;
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unsigned bc_implemented:2;
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work_func_t workfn;
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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 *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 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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int fw_device_enable_phys_dma(struct fw_device *device);
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/*
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* fw_unit.directory must not be accessed after device_del(&fw_unit.device).
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*/
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struct fw_unit {
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struct device device;
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const 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 *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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static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
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{
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get_device(&unit->device);
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return unit;
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}
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static inline void fw_unit_put(struct fw_unit *unit)
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{
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put_device(&unit->device);
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}
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static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
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{
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return fw_device(unit->device.parent);
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}
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struct ieee1394_device_id;
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struct fw_driver {
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struct device_driver driver;
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int (*probe)(struct fw_unit *unit, const struct ieee1394_device_id *id);
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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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void (*remove)(struct fw_unit *unit);
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const struct ieee1394_device_id *id_table;
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};
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struct fw_packet;
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struct fw_request;
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typedef void (*fw_packet_callback_t)(struct fw_packet *packet,
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struct fw_card *card, int status);
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typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
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void *data, size_t length,
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void *callback_data);
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/*
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* This callback handles an inbound request subaction. It is called in
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* RCU read-side context, therefore must not sleep.
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*
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* The callback should not initiate outbound request subactions directly.
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* Otherwise there is a danger of recursion of inbound and outbound
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* transactions from and to the local node.
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*
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* The callback is responsible that either fw_send_response() or kfree()
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* is called on the @request, except for FCP registers for which the core
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* takes care of that.
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*/
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typedef void (*fw_address_callback_t)(struct fw_card *card,
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struct fw_request *request,
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int tcode, int destination, int source,
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int generation,
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unsigned long long offset,
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void *data, size_t length,
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void *callback_data);
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struct fw_packet {
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int speed;
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int generation;
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u32 header[4];
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size_t header_length;
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void *payload;
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size_t payload_length;
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dma_addr_t payload_bus;
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bool payload_mapped;
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u32 timestamp;
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/*
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* This callback is called when the packet transmission has completed.
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* For successful transmission, the status code is the ack received
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* from the destination. Otherwise it is one of the juju-specific
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* rcodes: RCODE_SEND_ERROR, _CANCELLED, _BUSY, _GENERATION, _NO_ACK.
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* The callback can be called from tasklet context and thus
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* must never block.
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*/
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fw_packet_callback_t callback;
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int ack;
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struct list_head link;
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void *driver_data;
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};
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struct fw_transaction {
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int node_id; /* The generation is implied; it is always the current. */
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int tlabel;
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struct list_head link;
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struct fw_card *card;
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bool is_split_transaction;
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struct timer_list split_timeout_timer;
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struct fw_packet packet;
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/*
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* The data passed to the callback is valid only during the
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* callback.
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*/
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fw_transaction_callback_t callback;
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void *callback_data;
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};
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struct fw_address_handler {
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u64 offset;
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u64 length;
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fw_address_callback_t address_callback;
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void *callback_data;
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struct list_head link;
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};
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struct fw_address_region {
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u64 start;
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u64 end;
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};
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extern const struct fw_address_region fw_high_memory_region;
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int fw_core_add_address_handler(struct fw_address_handler *handler,
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const struct fw_address_region *region);
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void fw_core_remove_address_handler(struct fw_address_handler *handler);
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void fw_send_response(struct fw_card *card,
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struct fw_request *request, int rcode);
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int fw_get_request_speed(struct fw_request *request);
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void fw_send_request(struct fw_card *card, struct fw_transaction *t,
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int tcode, int destination_id, int generation, int speed,
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unsigned long long offset, void *payload, size_t length,
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fw_transaction_callback_t callback, void *callback_data);
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int fw_cancel_transaction(struct fw_card *card,
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struct fw_transaction *transaction);
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int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
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int generation, int speed, unsigned long long offset,
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void *payload, size_t length);
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const char *fw_rcode_string(int rcode);
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static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
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{
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return tag << 14 | channel << 8 | sy;
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}
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void fw_schedule_bus_reset(struct fw_card *card, bool delayed,
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bool short_reset);
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struct fw_descriptor {
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struct list_head link;
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size_t length;
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u32 immediate;
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u32 key;
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const u32 *data;
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};
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int fw_core_add_descriptor(struct fw_descriptor *desc);
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void fw_core_remove_descriptor(struct fw_descriptor *desc);
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/*
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* The iso packet format allows for an immediate header/payload part
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* stored in 'header' immediately after the packet info plus an
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* indirect payload part that is pointer to by the 'payload' field.
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* Applications can use one or the other or both to implement simple
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* low-bandwidth streaming (e.g. audio) or more advanced
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* scatter-gather streaming (e.g. assembling video frame automatically).
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*/
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struct fw_iso_packet {
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u16 payload_length; /* Length of indirect payload */
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u32 interrupt:1; /* Generate interrupt on this packet */
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u32 skip:1; /* tx: Set to not send packet at all */
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/* rx: Sync bit, wait for matching sy */
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u32 tag:2; /* tx: Tag in packet header */
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u32 sy:4; /* tx: Sy in packet header */
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u32 header_length:8; /* Length of immediate header */
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u32 header[0]; /* tx: Top of 1394 isoch. data_block */
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};
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#define FW_ISO_CONTEXT_TRANSMIT 0
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#define FW_ISO_CONTEXT_RECEIVE 1
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#define FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL 2
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#define FW_ISO_CONTEXT_MATCH_TAG0 1
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#define FW_ISO_CONTEXT_MATCH_TAG1 2
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#define FW_ISO_CONTEXT_MATCH_TAG2 4
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#define FW_ISO_CONTEXT_MATCH_TAG3 8
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#define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15
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/*
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* An iso buffer is just a set of pages mapped for DMA in the
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* specified direction. Since the pages are to be used for DMA, they
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* are not mapped into the kernel virtual address space. We store the
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* DMA address in the page private. The helper function
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* fw_iso_buffer_map() will map the pages into a given vma.
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*/
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struct fw_iso_buffer {
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enum dma_data_direction direction;
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struct page **pages;
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int page_count;
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int page_count_mapped;
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};
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int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
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int page_count, enum dma_data_direction direction);
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void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
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size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed);
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struct fw_iso_context;
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typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
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u32 cycle, size_t header_length,
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void *header, void *data);
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typedef void (*fw_iso_mc_callback_t)(struct fw_iso_context *context,
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dma_addr_t completed, void *data);
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struct fw_iso_context {
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struct fw_card *card;
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int type;
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int channel;
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int speed;
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bool drop_overflow_headers;
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size_t header_size;
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union {
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fw_iso_callback_t sc;
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fw_iso_mc_callback_t mc;
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} callback;
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void *callback_data;
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};
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struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
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int type, int channel, int speed, size_t header_size,
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fw_iso_callback_t callback, void *callback_data);
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int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels);
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int fw_iso_context_queue(struct fw_iso_context *ctx,
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struct fw_iso_packet *packet,
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struct fw_iso_buffer *buffer,
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unsigned long payload);
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void fw_iso_context_queue_flush(struct fw_iso_context *ctx);
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int fw_iso_context_flush_completions(struct fw_iso_context *ctx);
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int fw_iso_context_start(struct fw_iso_context *ctx,
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int cycle, int sync, int tags);
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int fw_iso_context_stop(struct fw_iso_context *ctx);
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void fw_iso_context_destroy(struct fw_iso_context *ctx);
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void fw_iso_resource_manage(struct fw_card *card, int generation,
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u64 channels_mask, int *channel, int *bandwidth,
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bool allocate);
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extern struct workqueue_struct *fw_workqueue;
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#endif /* _LINUX_FIREWIRE_H */
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