mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 04:06:38 +07:00
db5d247ae8
Control of more than one AV/C device at once --- e.g. camcorders, tape decks, audio devices, TV tuners --- failed or worked only unreliably, depending on driver implementation. This affected kernelspace and userspace drivers alike and was caused by firewire-core's inability to accept multiple registrations of FCP listeners. The fix allows multiple address handlers to be registered for the FCP command and response registers. When a request for these registers is received, all handlers are invoked, and the Firewire response is generated by the core and not by any handler. The cdev API does not change, i.e., userspace is still expected to send a response for FCP requests; this response is silently ignored. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (changelog, rebased, whitespace)
420 lines
11 KiB
C
420 lines
11 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 <asm/atomic.h>
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#include <asm/byteorder.h>
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#define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args)
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#define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
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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_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_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_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_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, int *key, int *value);
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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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struct timer_list flush_timer;
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unsigned long reset_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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/* Work struct for BM duties. */
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struct delayed_work work;
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int bm_retries;
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int bm_generation;
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__be32 bm_transaction_data[2];
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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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};
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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[12];
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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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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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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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static inline struct fw_device *fw_device_get(struct fw_device *device)
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{
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get_device(&device->device);
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return device;
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}
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static inline void fw_device_put(struct fw_device *device)
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{
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put_device(&device->device);
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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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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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/* 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 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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* Important note: Except for the FCP registers, the callback must guarantee
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* that either fw_send_response() or kfree() is called on the @request.
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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, int speed,
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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
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* completed; for successful transmission, the status code is
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* the ack received from the destination, otherwise it's a
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* negative errno: ENOMEM, ESTALE, ETIMEDOUT, ENODEV, EIO.
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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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int timestamp;
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struct list_head link;
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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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size_t 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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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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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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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; /* Set to not send packet at all. */
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u32 tag:2;
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u32 sy:4;
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u32 header_length:8; /* Length of immediate header. */
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u32 header[0];
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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_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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};
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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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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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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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size_t header_size;
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fw_iso_callback_t 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_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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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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#endif /* _LINUX_FIREWIRE_H */
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