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![Takashi Sakamoto](/assets/img/avatar_default.png)
At a commitf91c9d7610
('ALSA: firewire-lib: cache maximum length of payload to reduce function calls'), maximum size of payload for tx isochronous packet is cached to reduce the number of function calls. This cache was programmed to updated at a first callback of ohci1394 IR context. However, the maximum size is required to queueing packets before starting the isochronous context. As a result, the cached value is reused to queue packets in next time to starting the isochronous context. Then the cache is updated in a first callback of the isochronous context. This can cause kernel NULL pointer dereference in a below call graph: (sound/firewire/amdtp-stream.c) amdtp_stream_start() ->queue_in_packet() ->queue_packet() (drivers/firewire/core-iso.c) ->fw_iso_context_queue() ->struct fw_card_driver.queue_iso() (drivers/firewire/ohci.c) = ohci_queue_iso() ->queue_iso_packet_per_buffer() buffer->pages[page] The issued dereference occurs in a case that: - target unit supports different stream formats for sampling transmission frequency. - maximum length of payload for tx stream in a first trial is bigger than the length in a second trial. In this case, correct number of pages are allocated for DMA and the 'pages' array has enough elements, while index of the element is wrongly calculated according to the old value of length of payload in a call of 'queue_in_packet()'. Then it causes the issue. This commit fixes the critical bug. This affects all of drivers in ALSA firewire stack in Linux kernel v4.12 or later. [12665.302360] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030 [12665.302415] IP: ohci_queue_iso+0x47c/0x800 [firewire_ohci] [12665.302439] PGD 0 [12665.302440] P4D 0 [12665.302450] [12665.302470] Oops: 0000 [#1] SMP PTI [12665.302487] Modules linked in: ... [12665.303096] CPU: 1 PID: 12760 Comm: jackd Tainted: P OE 4.13.0-38-generic #43-Ubuntu [12665.303154] Hardware name: /DH77DF, BIOS KCH7710H.86A.0069.2012.0224.1825 02/24/2012 [12665.303215] task: ffff9ce87da2ae80 task.stack: ffffb5b8823d0000 [12665.303258] RIP: 0010:ohci_queue_iso+0x47c/0x800 [firewire_ohci] [12665.303301] RSP: 0018:ffffb5b8823d3ab8 EFLAGS: 00010086 [12665.303337] RAX: ffff9ce4f4876930 RBX: 0000000000000008 RCX: ffff9ce88a3955e0 [12665.303384] RDX: 0000000000000000 RSI: 0000000034877f00 RDI: 0000000000000000 [12665.303427] RBP: ffffb5b8823d3b68 R08: ffff9ce8ccb390a0 R09: ffff9ce877639ab0 [12665.303475] R10: 0000000000000108 R11: 0000000000000000 R12: 0000000000000003 [12665.303513] R13: 0000000000000000 R14: ffff9ce4f4876950 R15: 0000000000000000 [12665.303554] FS: 00007f2ec467f8c0(0000) GS:ffff9ce8df280000(0000) knlGS:0000000000000000 [12665.303600] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [12665.303633] CR2: 0000000000000030 CR3: 00000002dcf90004 CR4: 00000000000606e0 [12665.303674] Call Trace: [12665.303698] fw_iso_context_queue+0x18/0x20 [firewire_core] [12665.303735] queue_packet+0x88/0xe0 [snd_firewire_lib] [12665.303770] amdtp_stream_start+0x19b/0x270 [snd_firewire_lib] [12665.303811] start_streams+0x276/0x3c0 [snd_dice] [12665.303840] snd_dice_stream_start_duplex+0x1bf/0x480 [snd_dice] [12665.303882] ? vma_gap_callbacks_rotate+0x1e/0x30 [12665.303914] ? __rb_insert_augmented+0xab/0x240 [12665.303936] capture_prepare+0x3c/0x70 [snd_dice] [12665.303961] snd_pcm_do_prepare+0x1d/0x30 [snd_pcm] [12665.303985] snd_pcm_action_single+0x3b/0x90 [snd_pcm] [12665.304009] snd_pcm_action_nonatomic+0x68/0x70 [snd_pcm] [12665.304035] snd_pcm_prepare+0x68/0x90 [snd_pcm] [12665.304058] snd_pcm_common_ioctl1+0x4c0/0x940 [snd_pcm] [12665.304083] snd_pcm_capture_ioctl1+0x19b/0x250 [snd_pcm] [12665.304108] snd_pcm_capture_ioctl+0x27/0x40 [snd_pcm] [12665.304131] do_vfs_ioctl+0xa8/0x630 [12665.304148] ? entry_SYSCALL_64_after_hwframe+0xe9/0x139 [12665.304172] ? entry_SYSCALL_64_after_hwframe+0xe2/0x139 [12665.304195] ? entry_SYSCALL_64_after_hwframe+0xdb/0x139 [12665.304218] ? entry_SYSCALL_64_after_hwframe+0xd4/0x139 [12665.304242] ? entry_SYSCALL_64_after_hwframe+0xcd/0x139 [12665.304265] ? entry_SYSCALL_64_after_hwframe+0xc6/0x139 [12665.304288] ? entry_SYSCALL_64_after_hwframe+0xbf/0x139 [12665.304312] ? entry_SYSCALL_64_after_hwframe+0xb8/0x139 [12665.304335] ? entry_SYSCALL_64_after_hwframe+0xb1/0x139 [12665.304358] SyS_ioctl+0x79/0x90 [12665.304374] ? entry_SYSCALL_64_after_hwframe+0x72/0x139 [12665.304397] entry_SYSCALL_64_fastpath+0x24/0xab [12665.304417] RIP: 0033:0x7f2ec3750ef7 [12665.304433] RSP: 002b:00007fff99e31388 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [12665.304465] RAX: ffffffffffffffda RBX: 00007fff99e312f0 RCX: 00007f2ec3750ef7 [12665.304494] RDX: 0000000000000000 RSI: 0000000000004140 RDI: 0000000000000007 [12665.304522] RBP: 0000556ebc63fd60 R08: 0000556ebc640560 R09: 0000000000000000 [12665.304553] R10: 0000000000000001 R11: 0000000000000246 R12: 0000556ebc63fcf0 [12665.304584] R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000000 [12665.304612] Code: 01 00 00 44 89 eb 45 31 ed 45 31 db 66 41 89 1e 66 41 89 5e 0c 66 45 89 5e 0e 49 8b 49 08 49 63 d4 4d 85 c0 49 63 ff 48 8b 14 d1 <48> 8b 72 30 41 8d 14 37 41 89 56 04 48 63 d3 0f 84 ce 00 00 00 [12665.304713] RIP: ohci_queue_iso+0x47c/0x800 [firewire_ohci] RSP: ffffb5b8823d3ab8 [12665.304743] CR2: 0000000000000030 [12665.317701] ---[ end trace 9d55b056dd52a19f ]--- Fixes:f91c9d7610
('ALSA: firewire-lib: cache maximum length of payload to reduce function calls') Cc: <stable@vger.kernel.org> # v4.12+ Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
1029 lines
28 KiB
C
1029 lines
28 KiB
C
/*
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* Audio and Music Data Transmission Protocol (IEC 61883-6) streams
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* with Common Isochronous Packet (IEC 61883-1) headers
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/firewire.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "amdtp-stream.h"
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#define TICKS_PER_CYCLE 3072
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#define CYCLES_PER_SECOND 8000
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#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND)
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/* Always support Linux tracing subsystem. */
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#define CREATE_TRACE_POINTS
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#include "amdtp-stream-trace.h"
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#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */
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/* isochronous header parameters */
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#define ISO_DATA_LENGTH_SHIFT 16
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#define TAG_NO_CIP_HEADER 0
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#define TAG_CIP 1
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/* common isochronous packet header parameters */
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#define CIP_EOH_SHIFT 31
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#define CIP_EOH (1u << CIP_EOH_SHIFT)
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#define CIP_EOH_MASK 0x80000000
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#define CIP_SID_SHIFT 24
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#define CIP_SID_MASK 0x3f000000
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#define CIP_DBS_MASK 0x00ff0000
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#define CIP_DBS_SHIFT 16
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#define CIP_SPH_MASK 0x00000400
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#define CIP_SPH_SHIFT 10
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#define CIP_DBC_MASK 0x000000ff
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#define CIP_FMT_SHIFT 24
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#define CIP_FMT_MASK 0x3f000000
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#define CIP_FDF_MASK 0x00ff0000
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#define CIP_FDF_SHIFT 16
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#define CIP_SYT_MASK 0x0000ffff
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#define CIP_SYT_NO_INFO 0xffff
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/* Audio and Music transfer protocol specific parameters */
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#define CIP_FMT_AM 0x10
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#define AMDTP_FDF_NO_DATA 0xff
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/* TODO: make these configurable */
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#define INTERRUPT_INTERVAL 16
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#define QUEUE_LENGTH 48
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#define IN_PACKET_HEADER_SIZE 4
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#define OUT_PACKET_HEADER_SIZE 0
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static void pcm_period_tasklet(unsigned long data);
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/**
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* amdtp_stream_init - initialize an AMDTP stream structure
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* @s: the AMDTP stream to initialize
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* @unit: the target of the stream
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* @dir: the direction of stream
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* @flags: the packet transmission method to use
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* @fmt: the value of fmt field in CIP header
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* @process_data_blocks: callback handler to process data blocks
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* @protocol_size: the size to allocate newly for protocol
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*/
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int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir, enum cip_flags flags,
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unsigned int fmt,
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amdtp_stream_process_data_blocks_t process_data_blocks,
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unsigned int protocol_size)
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{
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if (process_data_blocks == NULL)
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return -EINVAL;
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s->protocol = kzalloc(protocol_size, GFP_KERNEL);
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if (!s->protocol)
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return -ENOMEM;
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s->unit = unit;
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s->direction = dir;
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s->flags = flags;
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s->context = ERR_PTR(-1);
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mutex_init(&s->mutex);
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tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s);
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s->packet_index = 0;
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init_waitqueue_head(&s->callback_wait);
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s->callbacked = false;
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s->fmt = fmt;
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s->process_data_blocks = process_data_blocks;
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return 0;
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}
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EXPORT_SYMBOL(amdtp_stream_init);
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/**
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* amdtp_stream_destroy - free stream resources
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* @s: the AMDTP stream to destroy
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*/
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void amdtp_stream_destroy(struct amdtp_stream *s)
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{
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/* Not initialized. */
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if (s->protocol == NULL)
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return;
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WARN_ON(amdtp_stream_running(s));
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kfree(s->protocol);
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mutex_destroy(&s->mutex);
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}
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EXPORT_SYMBOL(amdtp_stream_destroy);
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const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = {
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[CIP_SFC_32000] = 8,
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[CIP_SFC_44100] = 8,
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[CIP_SFC_48000] = 8,
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[CIP_SFC_88200] = 16,
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[CIP_SFC_96000] = 16,
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[CIP_SFC_176400] = 32,
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[CIP_SFC_192000] = 32,
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};
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EXPORT_SYMBOL(amdtp_syt_intervals);
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const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = {
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[CIP_SFC_32000] = 32000,
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[CIP_SFC_44100] = 44100,
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[CIP_SFC_48000] = 48000,
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[CIP_SFC_88200] = 88200,
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[CIP_SFC_96000] = 96000,
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[CIP_SFC_176400] = 176400,
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[CIP_SFC_192000] = 192000,
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};
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EXPORT_SYMBOL(amdtp_rate_table);
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/**
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* amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream
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* @s: the AMDTP stream, which must be initialized.
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* @runtime: the PCM substream runtime
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*/
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int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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struct snd_pcm_hardware *hw = &runtime->hw;
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int err;
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hw->info = SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID;
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/* SNDRV_PCM_INFO_BATCH */
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hw->periods_min = 2;
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hw->periods_max = UINT_MAX;
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/* bytes for a frame */
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hw->period_bytes_min = 4 * hw->channels_max;
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/* Just to prevent from allocating much pages. */
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hw->period_bytes_max = hw->period_bytes_min * 2048;
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hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
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/*
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* Currently firewire-lib processes 16 packets in one software
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* interrupt callback. This equals to 2msec but actually the
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* interval of the interrupts has a jitter.
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* Additionally, even if adding a constraint to fit period size to
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* 2msec, actual calculated frames per period doesn't equal to 2msec,
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* depending on sampling rate.
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* Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec.
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* Here let us use 5msec for safe period interrupt.
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*/
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err = snd_pcm_hw_constraint_minmax(runtime,
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SNDRV_PCM_HW_PARAM_PERIOD_TIME,
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5000, UINT_MAX);
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if (err < 0)
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goto end;
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/* Non-Blocking stream has no more constraints */
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if (!(s->flags & CIP_BLOCKING))
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goto end;
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/*
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* One AMDTP packet can include some frames. In blocking mode, the
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* number equals to SYT_INTERVAL. So the number is 8, 16 or 32,
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* depending on its sampling rate. For accurate period interrupt, it's
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* preferrable to align period/buffer sizes to current SYT_INTERVAL.
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*
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* TODO: These constraints can be improved with proper rules.
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* Currently apply LCM of SYT_INTERVALs.
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*/
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err = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32);
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if (err < 0)
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goto end;
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err = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32);
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end:
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return err;
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}
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EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints);
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/**
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* amdtp_stream_set_parameters - set stream parameters
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* @s: the AMDTP stream to configure
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* @rate: the sample rate
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* @data_block_quadlets: the size of a data block in quadlet unit
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*
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* The parameters must be set before the stream is started, and must not be
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* changed while the stream is running.
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*/
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int amdtp_stream_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int data_block_quadlets)
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{
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unsigned int sfc;
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for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) {
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if (amdtp_rate_table[sfc] == rate)
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break;
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}
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if (sfc == ARRAY_SIZE(amdtp_rate_table))
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return -EINVAL;
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s->sfc = sfc;
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s->data_block_quadlets = data_block_quadlets;
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s->syt_interval = amdtp_syt_intervals[sfc];
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/* default buffering in the device */
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s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
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if (s->flags & CIP_BLOCKING)
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/* additional buffering needed to adjust for no-data packets */
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s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
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return 0;
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}
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EXPORT_SYMBOL(amdtp_stream_set_parameters);
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/**
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* amdtp_stream_get_max_payload - get the stream's packet size
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* @s: the AMDTP stream
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*
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* This function must not be called before the stream has been configured
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* with amdtp_stream_set_parameters().
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*/
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unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s)
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{
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unsigned int multiplier = 1;
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unsigned int header_size = 0;
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if (s->flags & CIP_JUMBO_PAYLOAD)
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multiplier = 5;
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if (!(s->flags & CIP_NO_HEADER))
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header_size = 8;
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return header_size +
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s->syt_interval * s->data_block_quadlets * 4 * multiplier;
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}
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EXPORT_SYMBOL(amdtp_stream_get_max_payload);
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/**
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* amdtp_stream_pcm_prepare - prepare PCM device for running
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* @s: the AMDTP stream
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*
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* This function should be called from the PCM device's .prepare callback.
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*/
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void amdtp_stream_pcm_prepare(struct amdtp_stream *s)
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{
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tasklet_kill(&s->period_tasklet);
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s->pcm_buffer_pointer = 0;
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s->pcm_period_pointer = 0;
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}
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EXPORT_SYMBOL(amdtp_stream_pcm_prepare);
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static unsigned int calculate_data_blocks(struct amdtp_stream *s,
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unsigned int syt)
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{
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unsigned int phase, data_blocks;
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/* Blocking mode. */
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if (s->flags & CIP_BLOCKING) {
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/* This module generate empty packet for 'no data'. */
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if (syt == CIP_SYT_NO_INFO)
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data_blocks = 0;
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else
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data_blocks = s->syt_interval;
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/* Non-blocking mode. */
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} else {
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if (!cip_sfc_is_base_44100(s->sfc)) {
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/* Sample_rate / 8000 is an integer, and precomputed. */
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data_blocks = s->data_block_state;
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} else {
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phase = s->data_block_state;
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/*
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* This calculates the number of data blocks per packet so that
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* 1) the overall rate is correct and exactly synchronized to
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* the bus clock, and
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* 2) packets with a rounded-up number of blocks occur as early
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* as possible in the sequence (to prevent underruns of the
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* device's buffer).
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*/
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if (s->sfc == CIP_SFC_44100)
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/* 6 6 5 6 5 6 5 ... */
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data_blocks = 5 + ((phase & 1) ^
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(phase == 0 || phase >= 40));
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else
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/* 12 11 11 11 11 ... or 23 22 22 22 22 ... */
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data_blocks = 11 * (s->sfc >> 1) + (phase == 0);
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if (++phase >= (80 >> (s->sfc >> 1)))
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phase = 0;
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s->data_block_state = phase;
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}
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}
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return data_blocks;
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}
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static unsigned int calculate_syt(struct amdtp_stream *s,
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unsigned int cycle)
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{
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unsigned int syt_offset, phase, index, syt;
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if (s->last_syt_offset < TICKS_PER_CYCLE) {
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if (!cip_sfc_is_base_44100(s->sfc))
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syt_offset = s->last_syt_offset + s->syt_offset_state;
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else {
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/*
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* The time, in ticks, of the n'th SYT_INTERVAL sample is:
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* n * SYT_INTERVAL * 24576000 / sample_rate
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* Modulo TICKS_PER_CYCLE, the difference between successive
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* elements is about 1386.23. Rounding the results of this
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* formula to the SYT precision results in a sequence of
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* differences that begins with:
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* 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ...
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* This code generates _exactly_ the same sequence.
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*/
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phase = s->syt_offset_state;
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index = phase % 13;
|
|
syt_offset = s->last_syt_offset;
|
|
syt_offset += 1386 + ((index && !(index & 3)) ||
|
|
phase == 146);
|
|
if (++phase >= 147)
|
|
phase = 0;
|
|
s->syt_offset_state = phase;
|
|
}
|
|
} else
|
|
syt_offset = s->last_syt_offset - TICKS_PER_CYCLE;
|
|
s->last_syt_offset = syt_offset;
|
|
|
|
if (syt_offset < TICKS_PER_CYCLE) {
|
|
syt_offset += s->transfer_delay;
|
|
syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
|
|
syt += syt_offset % TICKS_PER_CYCLE;
|
|
|
|
return syt & CIP_SYT_MASK;
|
|
} else {
|
|
return CIP_SYT_NO_INFO;
|
|
}
|
|
}
|
|
|
|
static void update_pcm_pointers(struct amdtp_stream *s,
|
|
struct snd_pcm_substream *pcm,
|
|
unsigned int frames)
|
|
{
|
|
unsigned int ptr;
|
|
|
|
ptr = s->pcm_buffer_pointer + frames;
|
|
if (ptr >= pcm->runtime->buffer_size)
|
|
ptr -= pcm->runtime->buffer_size;
|
|
WRITE_ONCE(s->pcm_buffer_pointer, ptr);
|
|
|
|
s->pcm_period_pointer += frames;
|
|
if (s->pcm_period_pointer >= pcm->runtime->period_size) {
|
|
s->pcm_period_pointer -= pcm->runtime->period_size;
|
|
tasklet_hi_schedule(&s->period_tasklet);
|
|
}
|
|
}
|
|
|
|
static void pcm_period_tasklet(unsigned long data)
|
|
{
|
|
struct amdtp_stream *s = (void *)data;
|
|
struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
|
|
|
|
if (pcm)
|
|
snd_pcm_period_elapsed(pcm);
|
|
}
|
|
|
|
static int queue_packet(struct amdtp_stream *s, unsigned int header_length,
|
|
unsigned int payload_length)
|
|
{
|
|
struct fw_iso_packet p = {0};
|
|
int err = 0;
|
|
|
|
if (IS_ERR(s->context))
|
|
goto end;
|
|
|
|
p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL);
|
|
p.tag = s->tag;
|
|
p.header_length = header_length;
|
|
if (payload_length > 0)
|
|
p.payload_length = payload_length;
|
|
else
|
|
p.skip = true;
|
|
err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer,
|
|
s->buffer.packets[s->packet_index].offset);
|
|
if (err < 0) {
|
|
dev_err(&s->unit->device, "queueing error: %d\n", err);
|
|
goto end;
|
|
}
|
|
|
|
if (++s->packet_index >= QUEUE_LENGTH)
|
|
s->packet_index = 0;
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
static inline int queue_out_packet(struct amdtp_stream *s,
|
|
unsigned int payload_length)
|
|
{
|
|
return queue_packet(s, OUT_PACKET_HEADER_SIZE, payload_length);
|
|
}
|
|
|
|
static inline int queue_in_packet(struct amdtp_stream *s)
|
|
{
|
|
return queue_packet(s, IN_PACKET_HEADER_SIZE, s->max_payload_length);
|
|
}
|
|
|
|
static int handle_out_packet(struct amdtp_stream *s,
|
|
unsigned int payload_length, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
unsigned int syt;
|
|
unsigned int data_blocks;
|
|
unsigned int pcm_frames;
|
|
struct snd_pcm_substream *pcm;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
syt = calculate_syt(s, cycle);
|
|
data_blocks = calculate_data_blocks(s, syt);
|
|
pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt);
|
|
|
|
if (s->flags & CIP_DBC_IS_END_EVENT)
|
|
s->data_block_counter =
|
|
(s->data_block_counter + data_blocks) & 0xff;
|
|
|
|
buffer[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) |
|
|
(s->data_block_quadlets << CIP_DBS_SHIFT) |
|
|
((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) |
|
|
s->data_block_counter);
|
|
buffer[1] = cpu_to_be32(CIP_EOH |
|
|
((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) |
|
|
((s->fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) |
|
|
(syt & CIP_SYT_MASK));
|
|
|
|
if (!(s->flags & CIP_DBC_IS_END_EVENT))
|
|
s->data_block_counter =
|
|
(s->data_block_counter + data_blocks) & 0xff;
|
|
payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
|
|
|
|
trace_out_packet(s, cycle, buffer, payload_length, index);
|
|
|
|
if (queue_out_packet(s, payload_length) < 0)
|
|
return -EIO;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
/* No need to return the number of handled data blocks. */
|
|
return 0;
|
|
}
|
|
|
|
static int handle_out_packet_without_header(struct amdtp_stream *s,
|
|
unsigned int payload_length, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
unsigned int syt;
|
|
unsigned int data_blocks;
|
|
unsigned int pcm_frames;
|
|
struct snd_pcm_substream *pcm;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
syt = calculate_syt(s, cycle);
|
|
data_blocks = calculate_data_blocks(s, syt);
|
|
pcm_frames = s->process_data_blocks(s, buffer, data_blocks, &syt);
|
|
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
|
|
|
|
payload_length = data_blocks * 4 * s->data_block_quadlets;
|
|
|
|
trace_out_packet_without_header(s, cycle, payload_length, data_blocks,
|
|
index);
|
|
|
|
if (queue_out_packet(s, payload_length) < 0)
|
|
return -EIO;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
/* No need to return the number of handled data blocks. */
|
|
return 0;
|
|
}
|
|
|
|
static int handle_in_packet(struct amdtp_stream *s,
|
|
unsigned int payload_length, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
u32 cip_header[2];
|
|
unsigned int sph, fmt, fdf, syt;
|
|
unsigned int data_block_quadlets, data_block_counter, dbc_interval;
|
|
unsigned int data_blocks;
|
|
struct snd_pcm_substream *pcm;
|
|
unsigned int pcm_frames;
|
|
bool lost;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
cip_header[0] = be32_to_cpu(buffer[0]);
|
|
cip_header[1] = be32_to_cpu(buffer[1]);
|
|
|
|
trace_in_packet(s, cycle, cip_header, payload_length, index);
|
|
|
|
/*
|
|
* This module supports 'Two-quadlet CIP header with SYT field'.
|
|
* For convenience, also check FMT field is AM824 or not.
|
|
*/
|
|
if ((((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
|
|
((cip_header[1] & CIP_EOH_MASK) != CIP_EOH)) &&
|
|
(!(s->flags & CIP_HEADER_WITHOUT_EOH))) {
|
|
dev_info_ratelimited(&s->unit->device,
|
|
"Invalid CIP header for AMDTP: %08X:%08X\n",
|
|
cip_header[0], cip_header[1]);
|
|
data_blocks = 0;
|
|
pcm_frames = 0;
|
|
goto end;
|
|
}
|
|
|
|
/* Check valid protocol or not. */
|
|
sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT;
|
|
fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT;
|
|
if (sph != s->sph || fmt != s->fmt) {
|
|
dev_info_ratelimited(&s->unit->device,
|
|
"Detect unexpected protocol: %08x %08x\n",
|
|
cip_header[0], cip_header[1]);
|
|
data_blocks = 0;
|
|
pcm_frames = 0;
|
|
goto end;
|
|
}
|
|
|
|
/* Calculate data blocks */
|
|
fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
|
|
if (payload_length < 12 ||
|
|
(fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
|
|
data_blocks = 0;
|
|
} else {
|
|
data_block_quadlets =
|
|
(cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT;
|
|
/* avoid division by zero */
|
|
if (data_block_quadlets == 0) {
|
|
dev_err(&s->unit->device,
|
|
"Detect invalid value in dbs field: %08X\n",
|
|
cip_header[0]);
|
|
return -EPROTO;
|
|
}
|
|
if (s->flags & CIP_WRONG_DBS)
|
|
data_block_quadlets = s->data_block_quadlets;
|
|
|
|
data_blocks = (payload_length / 4 - 2) /
|
|
data_block_quadlets;
|
|
}
|
|
|
|
/* Check data block counter continuity */
|
|
data_block_counter = cip_header[0] & CIP_DBC_MASK;
|
|
if (data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) &&
|
|
s->data_block_counter != UINT_MAX)
|
|
data_block_counter = s->data_block_counter;
|
|
|
|
if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) &&
|
|
data_block_counter == s->tx_first_dbc) ||
|
|
s->data_block_counter == UINT_MAX) {
|
|
lost = false;
|
|
} else if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
|
|
lost = data_block_counter != s->data_block_counter;
|
|
} else {
|
|
if (data_blocks > 0 && s->tx_dbc_interval > 0)
|
|
dbc_interval = s->tx_dbc_interval;
|
|
else
|
|
dbc_interval = data_blocks;
|
|
|
|
lost = data_block_counter !=
|
|
((s->data_block_counter + dbc_interval) & 0xff);
|
|
}
|
|
|
|
if (lost) {
|
|
dev_err(&s->unit->device,
|
|
"Detect discontinuity of CIP: %02X %02X\n",
|
|
s->data_block_counter, data_block_counter);
|
|
return -EIO;
|
|
}
|
|
|
|
syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK;
|
|
pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt);
|
|
|
|
if (s->flags & CIP_DBC_IS_END_EVENT)
|
|
s->data_block_counter = data_block_counter;
|
|
else
|
|
s->data_block_counter =
|
|
(data_block_counter + data_blocks) & 0xff;
|
|
end:
|
|
if (queue_in_packet(s) < 0)
|
|
return -EIO;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int handle_in_packet_without_header(struct amdtp_stream *s,
|
|
unsigned int payload_quadlets, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
unsigned int data_blocks;
|
|
struct snd_pcm_substream *pcm;
|
|
unsigned int pcm_frames;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
data_blocks = payload_quadlets / s->data_block_quadlets;
|
|
|
|
trace_in_packet_without_header(s, cycle, payload_quadlets, data_blocks,
|
|
index);
|
|
|
|
pcm_frames = s->process_data_blocks(s, buffer, data_blocks, NULL);
|
|
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
|
|
|
|
if (queue_in_packet(s) < 0)
|
|
return -EIO;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On
|
|
* the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent
|
|
* it. Thus, via Linux firewire subsystem, we can get the 3 bits for second.
|
|
*/
|
|
static inline u32 compute_cycle_count(u32 tstamp)
|
|
{
|
|
return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff);
|
|
}
|
|
|
|
static inline u32 increment_cycle_count(u32 cycle, unsigned int addend)
|
|
{
|
|
cycle += addend;
|
|
if (cycle >= 8 * CYCLES_PER_SECOND)
|
|
cycle -= 8 * CYCLES_PER_SECOND;
|
|
return cycle;
|
|
}
|
|
|
|
static inline u32 decrement_cycle_count(u32 cycle, unsigned int subtrahend)
|
|
{
|
|
if (cycle < subtrahend)
|
|
cycle += 8 * CYCLES_PER_SECOND;
|
|
return cycle - subtrahend;
|
|
}
|
|
|
|
static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
|
|
size_t header_length, void *header,
|
|
void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
unsigned int i, packets = header_length / 4;
|
|
u32 cycle;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
/* Align to actual cycle count for the last packet. */
|
|
cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets);
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
cycle = increment_cycle_count(cycle, 1);
|
|
if (s->handle_packet(s, 0, cycle, i) < 0) {
|
|
s->packet_index = -1;
|
|
if (in_interrupt())
|
|
amdtp_stream_pcm_abort(s);
|
|
WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN);
|
|
return;
|
|
}
|
|
}
|
|
|
|
fw_iso_context_queue_flush(s->context);
|
|
}
|
|
|
|
static void in_stream_callback(struct fw_iso_context *context, u32 tstamp,
|
|
size_t header_length, void *header,
|
|
void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
unsigned int i, packets;
|
|
unsigned int payload_length, max_payload_length;
|
|
__be32 *headers = header;
|
|
u32 cycle;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
/* The number of packets in buffer */
|
|
packets = header_length / IN_PACKET_HEADER_SIZE;
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
/* Align to actual cycle count for the last packet. */
|
|
cycle = decrement_cycle_count(cycle, packets);
|
|
|
|
/* For buffer-over-run prevention. */
|
|
max_payload_length = s->max_payload_length;
|
|
|
|
for (i = 0; i < packets; i++) {
|
|
cycle = increment_cycle_count(cycle, 1);
|
|
|
|
/* The number of bytes in this packet */
|
|
payload_length =
|
|
(be32_to_cpu(headers[i]) >> ISO_DATA_LENGTH_SHIFT);
|
|
if (payload_length > max_payload_length) {
|
|
dev_err(&s->unit->device,
|
|
"Detect jumbo payload: %04x %04x\n",
|
|
payload_length, max_payload_length);
|
|
break;
|
|
}
|
|
|
|
if (s->handle_packet(s, payload_length, cycle, i) < 0)
|
|
break;
|
|
}
|
|
|
|
/* Queueing error or detecting invalid payload. */
|
|
if (i < packets) {
|
|
s->packet_index = -1;
|
|
if (in_interrupt())
|
|
amdtp_stream_pcm_abort(s);
|
|
WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN);
|
|
return;
|
|
}
|
|
|
|
fw_iso_context_queue_flush(s->context);
|
|
}
|
|
|
|
/* this is executed one time */
|
|
static void amdtp_stream_first_callback(struct fw_iso_context *context,
|
|
u32 tstamp, size_t header_length,
|
|
void *header, void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
u32 cycle;
|
|
unsigned int packets;
|
|
|
|
/*
|
|
* For in-stream, first packet has come.
|
|
* For out-stream, prepared to transmit first packet
|
|
*/
|
|
s->callbacked = true;
|
|
wake_up(&s->callback_wait);
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
packets = header_length / IN_PACKET_HEADER_SIZE;
|
|
cycle = decrement_cycle_count(cycle, packets);
|
|
context->callback.sc = in_stream_callback;
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->handle_packet = handle_in_packet_without_header;
|
|
else
|
|
s->handle_packet = handle_in_packet;
|
|
} else {
|
|
packets = header_length / 4;
|
|
cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets);
|
|
context->callback.sc = out_stream_callback;
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->handle_packet = handle_out_packet_without_header;
|
|
else
|
|
s->handle_packet = handle_out_packet;
|
|
}
|
|
|
|
s->start_cycle = cycle;
|
|
|
|
context->callback.sc(context, tstamp, header_length, header, s);
|
|
}
|
|
|
|
/**
|
|
* amdtp_stream_start - start transferring packets
|
|
* @s: the AMDTP stream to start
|
|
* @channel: the isochronous channel on the bus
|
|
* @speed: firewire speed code
|
|
*
|
|
* The stream cannot be started until it has been configured with
|
|
* amdtp_stream_set_parameters() and it must be started before any PCM or MIDI
|
|
* device can be started.
|
|
*/
|
|
int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
|
|
{
|
|
static const struct {
|
|
unsigned int data_block;
|
|
unsigned int syt_offset;
|
|
} initial_state[] = {
|
|
[CIP_SFC_32000] = { 4, 3072 },
|
|
[CIP_SFC_48000] = { 6, 1024 },
|
|
[CIP_SFC_96000] = { 12, 1024 },
|
|
[CIP_SFC_192000] = { 24, 1024 },
|
|
[CIP_SFC_44100] = { 0, 67 },
|
|
[CIP_SFC_88200] = { 0, 67 },
|
|
[CIP_SFC_176400] = { 0, 67 },
|
|
};
|
|
unsigned int header_size;
|
|
enum dma_data_direction dir;
|
|
int type, tag, err;
|
|
|
|
mutex_lock(&s->mutex);
|
|
|
|
if (WARN_ON(amdtp_stream_running(s) ||
|
|
(s->data_block_quadlets < 1))) {
|
|
err = -EBADFD;
|
|
goto err_unlock;
|
|
}
|
|
|
|
if (s->direction == AMDTP_IN_STREAM)
|
|
s->data_block_counter = UINT_MAX;
|
|
else
|
|
s->data_block_counter = 0;
|
|
s->data_block_state = initial_state[s->sfc].data_block;
|
|
s->syt_offset_state = initial_state[s->sfc].syt_offset;
|
|
s->last_syt_offset = TICKS_PER_CYCLE;
|
|
|
|
/* initialize packet buffer */
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
dir = DMA_FROM_DEVICE;
|
|
type = FW_ISO_CONTEXT_RECEIVE;
|
|
header_size = IN_PACKET_HEADER_SIZE;
|
|
} else {
|
|
dir = DMA_TO_DEVICE;
|
|
type = FW_ISO_CONTEXT_TRANSMIT;
|
|
header_size = OUT_PACKET_HEADER_SIZE;
|
|
}
|
|
err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH,
|
|
amdtp_stream_get_max_payload(s), dir);
|
|
if (err < 0)
|
|
goto err_unlock;
|
|
|
|
s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
|
|
type, channel, speed, header_size,
|
|
amdtp_stream_first_callback, s);
|
|
if (IS_ERR(s->context)) {
|
|
err = PTR_ERR(s->context);
|
|
if (err == -EBUSY)
|
|
dev_err(&s->unit->device,
|
|
"no free stream on this controller\n");
|
|
goto err_buffer;
|
|
}
|
|
|
|
amdtp_stream_update(s);
|
|
|
|
if (s->direction == AMDTP_IN_STREAM)
|
|
s->max_payload_length = amdtp_stream_get_max_payload(s);
|
|
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->tag = TAG_NO_CIP_HEADER;
|
|
else
|
|
s->tag = TAG_CIP;
|
|
|
|
s->packet_index = 0;
|
|
do {
|
|
if (s->direction == AMDTP_IN_STREAM)
|
|
err = queue_in_packet(s);
|
|
else
|
|
err = queue_out_packet(s, 0);
|
|
if (err < 0)
|
|
goto err_context;
|
|
} while (s->packet_index > 0);
|
|
|
|
/* NOTE: TAG1 matches CIP. This just affects in stream. */
|
|
tag = FW_ISO_CONTEXT_MATCH_TAG1;
|
|
if ((s->flags & CIP_EMPTY_WITH_TAG0) || (s->flags & CIP_NO_HEADER))
|
|
tag |= FW_ISO_CONTEXT_MATCH_TAG0;
|
|
|
|
s->callbacked = false;
|
|
err = fw_iso_context_start(s->context, -1, 0, tag);
|
|
if (err < 0)
|
|
goto err_context;
|
|
|
|
mutex_unlock(&s->mutex);
|
|
|
|
return 0;
|
|
|
|
err_context:
|
|
fw_iso_context_destroy(s->context);
|
|
s->context = ERR_PTR(-1);
|
|
err_buffer:
|
|
iso_packets_buffer_destroy(&s->buffer, s->unit);
|
|
err_unlock:
|
|
mutex_unlock(&s->mutex);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_start);
|
|
|
|
/**
|
|
* amdtp_stream_pcm_pointer - get the PCM buffer position
|
|
* @s: the AMDTP stream that transports the PCM data
|
|
*
|
|
* Returns the current buffer position, in frames.
|
|
*/
|
|
unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s)
|
|
{
|
|
/*
|
|
* This function is called in software IRQ context of period_tasklet or
|
|
* process context.
|
|
*
|
|
* When the software IRQ context was scheduled by software IRQ context
|
|
* of IR/IT contexts, queued packets were already handled. Therefore,
|
|
* no need to flush the queue in buffer anymore.
|
|
*
|
|
* When the process context reach here, some packets will be already
|
|
* queued in the buffer. These packets should be handled immediately
|
|
* to keep better granularity of PCM pointer.
|
|
*
|
|
* Later, the process context will sometimes schedules software IRQ
|
|
* context of the period_tasklet. Then, no need to flush the queue by
|
|
* the same reason as described for IR/IT contexts.
|
|
*/
|
|
if (!in_interrupt() && amdtp_stream_running(s))
|
|
fw_iso_context_flush_completions(s->context);
|
|
|
|
return READ_ONCE(s->pcm_buffer_pointer);
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_pcm_pointer);
|
|
|
|
/**
|
|
* amdtp_stream_pcm_ack - acknowledge queued PCM frames
|
|
* @s: the AMDTP stream that transfers the PCM frames
|
|
*
|
|
* Returns zero always.
|
|
*/
|
|
int amdtp_stream_pcm_ack(struct amdtp_stream *s)
|
|
{
|
|
/*
|
|
* Process isochronous packets for recent isochronous cycle to handle
|
|
* queued PCM frames.
|
|
*/
|
|
if (amdtp_stream_running(s))
|
|
fw_iso_context_flush_completions(s->context);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_pcm_ack);
|
|
|
|
/**
|
|
* amdtp_stream_update - update the stream after a bus reset
|
|
* @s: the AMDTP stream
|
|
*/
|
|
void amdtp_stream_update(struct amdtp_stream *s)
|
|
{
|
|
/* Precomputing. */
|
|
WRITE_ONCE(s->source_node_id_field,
|
|
(fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) & CIP_SID_MASK);
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_update);
|
|
|
|
/**
|
|
* amdtp_stream_stop - stop sending packets
|
|
* @s: the AMDTP stream to stop
|
|
*
|
|
* All PCM and MIDI devices of the stream must be stopped before the stream
|
|
* itself can be stopped.
|
|
*/
|
|
void amdtp_stream_stop(struct amdtp_stream *s)
|
|
{
|
|
mutex_lock(&s->mutex);
|
|
|
|
if (!amdtp_stream_running(s)) {
|
|
mutex_unlock(&s->mutex);
|
|
return;
|
|
}
|
|
|
|
tasklet_kill(&s->period_tasklet);
|
|
fw_iso_context_stop(s->context);
|
|
fw_iso_context_destroy(s->context);
|
|
s->context = ERR_PTR(-1);
|
|
iso_packets_buffer_destroy(&s->buffer, s->unit);
|
|
|
|
s->callbacked = false;
|
|
|
|
mutex_unlock(&s->mutex);
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_stop);
|
|
|
|
/**
|
|
* amdtp_stream_pcm_abort - abort the running PCM device
|
|
* @s: the AMDTP stream about to be stopped
|
|
*
|
|
* If the isochronous stream needs to be stopped asynchronously, call this
|
|
* function first to stop the PCM device.
|
|
*/
|
|
void amdtp_stream_pcm_abort(struct amdtp_stream *s)
|
|
{
|
|
struct snd_pcm_substream *pcm;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
if (pcm)
|
|
snd_pcm_stop_xrun(pcm);
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_pcm_abort);
|