Xilinx xdma Linux平台使用

作者

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方法

官网下载驱动，我下载2017.4版本的，当时还有18.2版本，由于vivado是17.4，实测发现windows下，18.2版本的驱动无法操作17.4的FPGA，切换到老版本即可。ubuntu 16.04.4编译17.4驱动需要修改代码，

#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)
		dbg_init("Enabling MSI-X\n");
		rc = pci_alloc_irq_vectors(pdev, req_nvec, req_nvec,
					PCI_IRQ_MSIX);
#else
		int i;
	<span class="token function">dbg_init</span><span class="token punctuation">(</span><span class="token string">"Enabling MSI-X\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span>i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> req_nvec<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span>
		xdev<span class="token operator">-&gt;</span>entry<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>entry <span class="token operator">=</span> i<span class="token punctuation">;</span>

	rc <span class="token operator">=</span> <span class="token function">pci_enable_msix</span><span class="token punctuation">(</span>pdev<span class="token punctuation">,</span> xdev<span class="token operator">-&gt;</span>entry<span class="token punctuation">,</span> req_nvec<span class="token punctuation">)</span><span class="token punctuation">;</span>

#endif

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测试，PCIe2.0x4，带宽位1.5GB/s，达到满速状态，

[email protected]:~/xdma/tests$ sudo ./dma_to_device -d /dev/xdma0_h2c_0 -a 0 -s 0x400000 -c 16 -v
sscanf() = 1, value = 0x00000000
sscanf() = 1, value = 0x00400000
sscanf() = 1, value = 0x00000010
device = /dev/xdma0_h2c_0, address = 0x00000000, size = 0x00400000, offset = 0x00000000, count = 16
host memory buffer = 0x7f03545a4000
CLOCK_MONOTONIC reports 0.002827977 seconds (total) for last transfer of 4194304 bytes
[email protected]:~/xdma/tests$ sudo ./dma_from_device -d /dev/xdma0_c2h_0 -a 0 -s 0x400000 -c 16 -v
sscanf() = 1, value = 0x00000000
sscanf() = 1, value = 0x00400000
sscanf() = 1, value = 0x00000010
device = /dev/xdma0_c2h_0, address = 0x00000000, size = 0x00400000, offset = 0x00000000, count = 16
host memory buffer = 0x7f8b21ff7000
CLOCK_MONOTONIC reports 0.003003013 seconds (total) for last transfer of 4194304 bytes

 
 

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Linux

下载Xilinx_Answer_65444_Linux_Files_rel20180420.zip，修改xdma/libxdma.c，添加，

#include <linux/slab.h> /*add by zc*/

 
 

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编译，

$ cd xdma
$ make

 
 

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测试，

xdma:xdma_mod_init: desc_blen_max: 0xfffffff/268435455, sgdma_timeout: 10 sec.
xdma:xdma_device_open: xdma device 0000:07:00.0, 0xc00000007e309000.
xdma:map_single_bar: BAR0 at 0xc44000000 mapped at 0x8000080090ac0000, length=65536(/65536)
xdma:map_bars: config bar 0, pos 0.
xdma:identify_bars: 1 BARs: config 0, user -1, bypass -1.
xdma:check_nonzero_interrupt_status: 0000:07:00.0 xdma0 user_int_pending = 0x00000001
xdma:probe_one: 0000:07:00.0 xdma0, pdev 0xc00000007e309000, xdev 0xc00000007c2de000, 0xc00000007e278000, usr 16, ch 1,1.

 
 

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x86

2017.4版本，打开调试，开机打印，

[email protected]:~/x86-static-16.04.4/bin$ dmesg -c
[  181.916322] xdma v2017.0.45
[  181.916323] xdma_init():xdma init()
[  181.916353] probe():probe(pdev = 0xffff934e1a6dd000, pci_id = 0xffffffffc08a03c0)
[  181.916354] alloc_dev_instance():probe() lro = 0xffff934e18918000
[  181.916426] probe():pci_set_master()
[  181.916435] probe_scan_for_msi():pci_enable_msi()
[  181.916462] request_regions():pci_request_regions()
[  181.916467] map_single_bar():BAR0: 65536 bytes to be mapped.
[  181.916491] map_single_bar():BAR0 at 0xf7d00000 mapped at 0xffffa2fbc1780000, length=65536(/65536)
[  181.916494] is_config_bar():BAR 0 is the XDMA config BAR
[  181.916495] map_single_bar():BAR #1 is not present - skipping
[  181.916496] map_single_bar():BAR #2 is not present - skipping
[  181.916497] map_single_bar():BAR #3 is not present - skipping
[  181.916498] map_single_bar():BAR #4 is not present - skipping
[  181.916498] map_single_bar():BAR #5 is not present - skipping
[  181.916500] set_dma_mask():sizeof(dma_addr_t) == 8
[  181.916501] set_dma_mask():Could not set 64-bit DMA mask.
[  181.916502] set_dma_mask():Using a 32-bit DMA mask.
[  181.916514] irq_setup():Using IRQ#30 with 0xffff934e18918000
[  181.916516] probe_for_engine():Probing for H2C 0 engine at ffffa2fbc1780000
[  181.916519] probe_for_engine():engine ID = 0x1fc0
[  181.916519] probe_for_engine():engine channel ID = 0x0
[  181.916521] probe_for_engine():Found H2C 0 AXI engine at ffffa2fbc1780000
[  181.916523] engine_create():engine ffff934d335aca00 name H2C irq_bitmask=0x00000001
[  181.916525] engine_alignments():engine ffff934d335aca00 name H2C alignments=0x00010140
[  181.916526] engine_alignments():align_bytes = 1
[  181.916527] engine_alignments():granularity_bytes = 1
[  181.916527] engine_alignments():address_bits = 64
[  181.916529] probe_for_engine():Probing for H2C 1 engine at ffffa2fbc1780100
[  181.916531] probe_for_engine():engine ID = 0x0
[  181.916532] probe_for_engine():engine channel ID = 0x0
[  181.916533] probe_for_engine():Incorrect engine ID - skipping
[  181.916534] probe_for_engine():Probing for H2C 2 engine at ffffa2fbc1780200
[  181.916536] probe_for_engine():engine ID = 0x0
[  181.916537] probe_for_engine():engine channel ID = 0x0
[  181.916538] probe_for_engine():Incorrect engine ID - skipping
[  181.916538] probe_for_engine():Probing for H2C 3 engine at ffffa2fbc1780300
[  181.916541] probe_for_engine():engine ID = 0x0
[  181.916542] probe_for_engine():engine channel ID = 0x0
[  181.916542] probe_for_engine():Incorrect engine ID - skipping
[  181.916543] probe_for_engine():Probing for C2C 0 engine at ffffa2fbc1781000
[  181.916546] probe_for_engine():engine ID = 0x1fc1
[  181.916547] probe_for_engine():engine channel ID = 0x0
[  181.916548] probe_for_engine():Found C2H 0 AXI engine at ffffa2fbc1781000
[  181.916550] engine_create():engine ffff934d335ace00 name C2H irq_bitmask=0x00000002
[  181.916552] engine_alignments():engine ffff934d335ace00 name C2H alignments=0x00010140
[  181.916552] engine_alignments():align_bytes = 1
[  181.916553] engine_alignments():granularity_bytes = 1
[  181.916554] engine_alignments():address_bits = 64
[  181.916555] probe_for_engine():Probing for C2C 1 engine at ffffa2fbc1781100
[  181.916557] probe_for_engine():engine ID = 0x0
[  181.916558] probe_for_engine():engine channel ID = 0x0
[  181.916559] probe_for_engine():Incorrect engine ID - skipping
[  181.916560] probe_for_engine():Probing for C2C 2 engine at ffffa2fbc1781200
[  181.916562] probe_for_engine():engine ID = 0x0
[  181.916563] probe_for_engine():engine channel ID = 0x0
[  181.916564] probe_for_engine():Incorrect engine ID - skipping
[  181.916565] probe_for_engine():Probing for C2C 3 engine at ffffa2fbc1781300
[  181.916567] probe_for_engine():engine ID = 0x0
[  181.916568] probe_for_engine():engine channel ID = 0x0
[  181.916569] probe_for_engine():Incorrect engine ID - skipping
[  181.916570] create_interfaces():No user logic BAR detected - skip device setup
[  181.916571] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.916573] gen_dev_major():Dynamic allocated major=244, rc=0
[  181.917746] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.917954] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918502] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918537] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918559] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918582] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918604] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918627] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918650] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918811] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918840] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918862] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918885] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918905] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.918945] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.919522] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0x          (null))
[  181.919557] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0xffff934d335aca00)
[  181.919581] create_sg_char():xdma(lro = 0xffff934e18918000, engine = 0xffff934d335ace00)
[  181.919604] create_interfaces():No bypass BAR detected - skip device setup
[  181.919607] read_interrupts():ioread32(0xffffa2fbc1782040) returned 0x00000000 (user_int_request).
[  181.919608] read_interrupts():ioread32(0xffffa2fbc1782044) returned 0x00000000 (channel_int_request)
[  181.919609] Create device attribute file for major =244, instance = 0
[  181.919611] Device file created successfully

 
 

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发送数据到板卡，板卡读，

[email protected]:~/x86-static-16.04.4/bin$ sudo ./dma_to_device -d /dev/xdma0_h2c_0 -a 0x1000000000 -s 4096 -v
sscanf() = 1, value = 0x00001000
device = /dev/xdma0_h2c_0, address = 0x1000000000, size = 0x00001000, offset = 0x00000000, count = 1
host memory buffer = 0xeaf000
CLOCK_MONOTONIC reports 0.000169817 seconds (total) for last transfer of 4096 bytes
[email protected]:~/x86-static-16.04.4/bin$ dmesg -c
[  250.317286] char_sgdma_open(): H2C0: char_sgdma_open(0xffff934e14becb68, 0xffff934dbdca5b00)
[  250.317290] char_sgdma_llseek():char_sgdma_llseek: pos=68719476736
[  250.317299] char_sgdma_read_write(): H2C0: seq:0 file=0xffff934dbdca5b00, buf=0x0000000000eaf000, count=4096, pos=68719476736
[  250.317301] char_sgdma_read_write(): H2C0: seq:0 dir_to_dev=1 write request
[  250.317302] char_sgdma_read_write(): H2C0: H2C engine channel 0 (engine num 0)= 0xffff934d335aca00
[  250.317303] char_sgdma_read_write(): H2C0: lro = 0xffff934e18918000
[  250.317305] char_sgdma_read_write(): H2C0: res = 0, remaining = 4096
[  250.317306] transfer_create():transfer_create()
[  250.317309] transfer_create():mapped_pages=1.
[  250.317310] transfer_create():sgl = 0xffff934dd3025180.
[  250.317313] transfer_create():hwnents=1.
[  250.317314] transfer_create():sg_page(&sgl[0])=0xffffc9c0c445b640.
[  250.317315] transfer_create():sg_dma_address(&sgl[0])=0x00000000d46b2000.
[  250.317316] transfer_create():sg_dma_len(&sgl[0])=0x00001000.
[  250.317318] transfer_create():transfer_create():
[  250.317319] transfer_create():transfer->desc_bus = 0xbdc59000.
[  250.317320] transfer_build():SGLE    0: addr=0x00000000d46b2000 length=0x00001000
[  250.317322] transfer_build():DESC    0: cont_addr=0xd46b2000 cont_len=0x00001000 ep_addr=0x1000000000
[  250.317323] transfer_create():transfer 0xffff934e14c2ca00 has 1 descriptors
[  250.317324] transfer_data(): H2C0: seq:0 transfer=0xffff934e14c2ca00.
[  250.317325] transfer_dump():Descriptor Entry (Pre-Transfer)
[  250.317327] dump_desc():0xffff934dbdc59000/0x00: 0xad4b0013 0xad4b0013 magic|extra_adjacent|control
[  250.317328] dump_desc():0xffff934dbdc59004/0x04: 0x00001000 0x00001000 bytes
[  250.317330] dump_desc():0xffff934dbdc59008/0x08: 0xd46b2000 0xd46b2000 src_addr_lo
[  250.317331] dump_desc():0xffff934dbdc5900c/0x0c: 0x00000000 0x00000000 src_addr_hi
[  250.317332] dump_desc():0xffff934dbdc59010/0x00: 0x00000000 0x00000000 dst_addr_lo
[  250.317334] dump_desc():0xffff934dbdc59014/0x04: 0x00000010 0x00000010 dst_addr_hi
[  250.317335] dump_desc():0xffff934dbdc59018/0x08: 0x00000000 0x00000000 next_addr
[  250.317336] dump_desc():0xffff934dbdc5901c/0x0c: 0x00000000 0x00000000 next_addr_pad
[  250.317337] dump_desc():
[  250.317339] transfer_queue(): H2C0: transfer_queue(transfer=0xffff934e14c2ca00).
[  250.317340] transfer_queue(): H2C0: transfer_queue(): starting H2C engine.
[  250.317341] engine_start(): H2C0: engine_start(H2C): transfer=0xffff934e14c2ca00.
[  250.317342] engine_start(): H2C0: iowrite32(0xbdc59000 to 0xffffa2fbc1784080) (first_desc_lo)
[  250.317344] engine_start(): H2C0: iowrite32(0x00000000 to 0xffffa2fbc1784084) (first_desc_hi)
[  250.317345] engine_start(): H2C0: iowrite32(0x00000000 to 0xffffa2fbc1784088) (first_desc_adjacent)
[  250.317346] engine_start(): H2C0: ioread32(0xffffa2fbc1780040) (dummy read flushes writes).
[  250.317347] engine_start_mode_config(): H2C0: iowrite32(0x00f83e1f to 0xffffa2fbc1780004) (control)
[  250.317350] engine_start_mode_config(): H2C0: ioread32(0xffffa2fbc1780040) = 0x00000001 (dummy read flushes writes).
[  250.317351] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780000).
[  250.317353] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780000) returned 0x1fc00006.
[  250.317363] xdma_isr():(irq=30) <<<< INTERRUPT SERVICE ROUTINE
[  250.317365] xdma_isr():ch_irq = 0x00000001
[  250.317366] xdma_isr():user_irq = 0x00000000
[  250.317367] xdma_isr(): H2C0: schedule_work(engine=ffff934d335aca00)
[  250.317373] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780040) returned 0x00000006 (status).
[  250.317375] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780004) returned 0x00f83e1f (control)
[  250.317377] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784080) returned 0xbdc59000 (first_desc_lo)
[  250.317378] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784084) returned 0x00000000 (first_desc_hi)
[  250.317380] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784088) returned 0x00000000 (first_desc_adjacent).
[  250.317382] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780048) returned 0x00000001 (completed_desc_count).
[  250.317384] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780090) returned 0x00f83e1e (interrupt_enable_mask)
[  250.317385] engine_status_read(): H2C0: Status of SG DMA H2C engine:
[  250.317386] engine_status_read(): H2C0: ioread32(0xffffa2fbc1780040).
[  250.317389] engine_status_read(): H2C0: status = 0x00000006: IDLE DESC_STOPPED DESC_COMPLETED 
[  250.317390] engine_start(): H2C0: H2C engine 0xffff934d335aca00 now running
[  250.317391] transfer_queue(): H2C0: transfer=0xffff934e14c2ca00 started H2C engine with transfer 0xffff934e14c2ca00.
[  250.317392] transfer_queue(): H2C0: engine->running = 1
[  250.317396] engine_service_work(): H2C0: engine_service() for H2C engine ffff934d335aca00
[  250.317398] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780000).
[  250.317399] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780000) returned 0x1fc00006.
[  250.317401] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780040) returned 0x00000006 (status).
[  250.317403] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780004) returned 0x00f83e1f (control)
[  250.317405] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784080) returned 0xbdc59000 (first_desc_lo)
[  250.317407] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784084) returned 0x00000000 (first_desc_hi)
[  250.317409] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1784088) returned 0x00000000 (first_desc_adjacent).
[  250.317411] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780048) returned 0x00000001 (completed_desc_count).
[  250.317413] engine_reg_dump(): H2C0: ioread32(0xffffa2fbc1780090) returned 0x00f83e1e (interrupt_enable_mask)
[  250.317414] engine_status_read(): H2C0: Status of SG DMA H2C engine:
[  250.317415] engine_status_read(): H2C0: ioread32(0xffffa2fbc1780040).
[  250.317417] engine_status_read(): H2C0: status = 0x00000006: IDLE DESC_STOPPED DESC_COMPLETED 
[  250.317418] engine_service_shutdown(): H2C0: engine just went idle, resetting RUN_STOP.
[  250.317419] xdma_engine_stop(): H2C0: xdma_engine_stop(engine=ffff934d335aca00)
[  250.317421] xdma_engine_stop(): H2C0: Stopping SG DMA H2C engine; writing 0x00f83e1e to 0xffffa2fbc1780004.
[  250.317422] xdma_engine_stop(): H2C0: xdma_engine_stop(H2C) done
[  250.317423] engine_service(): H2C0: desc_count = 1
[  250.317425] engine_service(): H2C0: head of queue transfer 0xffff934e14c2ca00 has 1 descriptors
[  250.317426] engine_service(): H2C0: Engine completed 1 desc, 1 not yet dequeued
[  250.317428] engine_service_final_transfer(): H2C0: engine H2C completed transfer
[  250.317429] engine_service_final_transfer(): H2C0: Completed transfer ID = 0xffff934e14c2ca00
[  250.317430] engine_service_final_transfer(): H2C0: *pdesc_completed=1, transfer->desc_num=1
[  250.317432] engine_service_resume(): H2C0: no pending transfers, H2C engine stays idle.
[  250.317447] transfer_data(): H2C0: transfer ffff934e14c2ca00 completed
[  250.317451] transfer_data(): H2C0: remain=0, done=4096
[  250.317453] char_sgdma_read_write(): H2C0: seq:0 char_sgdma_read_write() return=4096.
[  250.317454] interrupt_status():reg = ffffa2fbc1782000
[  250.317455] interrupt_status():&reg->user_int_enable = ffffa2fbc1782004
[  250.317457] interrupt_status():user_int_enable = 0x00000001
[  250.317458] interrupt_status():channel_int_enable = 0x00000003
[  250.317460] interrupt_status():user_int_request = 0x00000000
[  250.317462] interrupt_status():channel_int_request = 0x00000000
[  250.317463] interrupt_status():user_int_pending = 0x00000000
[  250.317465] interrupt_status():channel_int_pending = 0x00000000
[  250.317481] char_sgdma_close(): H2C0: char_sgdma_close(0xffff934e14becb68, 0xffff934dbdca5b00)

 
 

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接收数据，板卡写，

[email protected]:~/x86-static-16.04.4/bin$ sudo ./dma_from_device -d /dev/xdma0_c2h_0 -a 0x1000000000 -s 4096 -v
sscanf() = 1, value = 0x00001000
device = /dev/xdma0_c2h_0, address = 0x1000000000, size = 0x00001000, offset = 0x00000000, count = 1
host memory buffer = 0x12d9000
CLOCK_MONOTONIC reports 0.000137324 seconds (total) for last transfer of 4096 bytes
[email protected]:~/x86-static-16.04.4/bin$ dmesg -c
[  333.802040] char_sgdma_open(): C2H0: char_sgdma_open(0xffff934e14bee428, 0xffff934e146e3b00)
[  333.802046] char_sgdma_llseek():char_sgdma_llseek: pos=68719476736
[  333.802055] char_sgdma_read_write(): C2H0: seq:1 file=0xffff934e146e3b00, buf=0x00000000012d9000, count=4096, pos=68719476736
[  333.802057] char_sgdma_read_write(): C2H0: seq:1 dir_to_dev=0 read request
[  333.802058] char_sgdma_read_write(): C2H0: C2H engine channel 0 (engine num 1)= 0xffff934d335ace00
[  333.802059] char_sgdma_read_write(): C2H0: lro = 0xffff934e18918000
[  333.802060] char_sgdma_read_write(): C2H0: res = 0, remaining = 4096
[  333.802062] transfer_create():transfer_create()
[  333.802064] transfer_create():mapped_pages=1.
[  333.802065] transfer_create():sgl = 0xffff934d34c71060.
[  333.802066] transfer_create():hwnents=1.
[  333.802067] transfer_create():sg_page(&sgl[0])=0xffffc9c0c2c563c0.
[  333.802068] transfer_create():sg_dma_address(&sgl[0])=0x00000000b158f000.
[  333.802069] transfer_create():sg_dma_len(&sgl[0])=0x00001000.
[  333.802071] transfer_create():transfer_create():
[  333.802071] transfer_create():transfer->desc_bus = 0xc0bfd000.
[  333.802073] transfer_build():SGLE    0: addr=0x00000000b158f000 length=0x00001000
[  333.802074] transfer_build():DESC    0: cont_addr=0xb158f000 cont_len=0x00001000 ep_addr=0x1000000000
[  333.802075] transfer_create():transfer 0xffff934e14c2cb00 has 1 descriptors
[  333.802077] transfer_data(): C2H0: seq:1 transfer=0xffff934e14c2cb00.
[  333.802078] transfer_dump():Descriptor Entry (Pre-Transfer)
[  333.802079] dump_desc():0xffff934dc0bfd000/0x00: 0xad4b0013 0xad4b0013 magic|extra_adjacent|control
[  333.802081] dump_desc():0xffff934dc0bfd004/0x04: 0x00001000 0x00001000 bytes
[  333.802082] dump_desc():0xffff934dc0bfd008/0x08: 0x00000000 0x00000000 src_addr_lo
[  333.802083] dump_desc():0xffff934dc0bfd00c/0x0c: 0x00000010 0x00000010 src_addr_hi
[  333.802085] dump_desc():0xffff934dc0bfd010/0x00: 0xb158f000 0xb158f000 dst_addr_lo
[  333.802086] dump_desc():0xffff934dc0bfd014/0x04: 0x00000000 0x00000000 dst_addr_hi
[  333.802087] dump_desc():0xffff934dc0bfd018/0x08: 0x00000000 0x00000000 next_addr
[  333.802089] dump_desc():0xffff934dc0bfd01c/0x0c: 0x00000000 0x00000000 next_addr_pad
[  333.802089] dump_desc():
[  333.802091] transfer_queue(): C2H0: transfer_queue(transfer=0xffff934e14c2cb00).
[  333.802092] transfer_queue(): C2H0: transfer_queue(): starting C2H engine.
[  333.802093] engine_start(): C2H0: engine_start(C2H): transfer=0xffff934e14c2cb00.
[  333.802095] engine_start(): C2H0: iowrite32(0xc0bfd000 to 0xffffa2fbc1785080) (first_desc_lo)
[  333.802096] engine_start(): C2H0: iowrite32(0x00000000 to 0xffffa2fbc1785084) (first_desc_hi)
[  333.802097] engine_start(): C2H0: iowrite32(0x00000000 to 0xffffa2fbc1785088) (first_desc_adjacent)
[  333.802098] engine_start(): C2H0: ioread32(0xffffa2fbc1781040) (dummy read flushes writes).
[  333.802100] engine_start_mode_config(): C2H0: iowrite32(0x00f83e1f to 0xffffa2fbc1781004) (control)
[  333.802102] engine_start_mode_config(): C2H0: ioread32(0xffffa2fbc1781040) = 0x00000001 (dummy read flushes writes).
[  333.802103] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781000).
[  333.802105] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781000) returned 0x1fc10006.
[  333.802107] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781040) returned 0x00000006 (status).
[  333.802109] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781004) returned 0x00f83e1f (control)
[  333.802111] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785080) returned 0xc0bfd000 (first_desc_lo)
[  333.802113] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785084) returned 0x00000000 (first_desc_hi)
[  333.802114] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785088) returned 0x00000000 (first_desc_adjacent).
[  333.802116] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781048) returned 0x00000001 (completed_desc_count).
[  333.802118] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781090) returned 0x00f83e1e (interrupt_enable_mask)
[  333.802119] xdma_isr():(irq=30) <<<< INTERRUPT SERVICE ROUTINE
[  333.802121] xdma_isr():ch_irq = 0x00000002
[  333.802123] engine_status_read(): C2H0: Status of SG DMA C2H engine:
[  333.802124] engine_status_read(): C2H0: ioread32(0xffffa2fbc1781040).
[  333.802126] engine_status_read(): C2H0: status = 0x00000006: IDLE DESC_STOPPED DESC_COMPLETED 
[  333.802126] xdma_isr():user_irq = 0x00000000
[  333.802128] xdma_isr(): C2H0: schedule_work(engine=ffff934d335ace00)
[  333.802130] engine_start(): C2H0: C2H engine 0xffff934d335ace00 now running
[  333.802131] transfer_queue(): C2H0: transfer=0xffff934e14c2cb00 started C2H engine with transfer 0xffff934e14c2cb00.
[  333.802132] transfer_queue(): C2H0: engine->running = 1
[  333.802134] engine_service_work(): C2H0: engine_service() for C2H engine ffff934d335ace00
[  333.802135] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781000).
[  333.802137] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781000) returned 0x1fc10006.
[  333.802139] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781040) returned 0x00000006 (status).
[  333.802141] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781004) returned 0x00f83e1f (control)
[  333.802143] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785080) returned 0xc0bfd000 (first_desc_lo)
[  333.802145] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785084) returned 0x00000000 (first_desc_hi)
[  333.802147] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1785088) returned 0x00000000 (first_desc_adjacent).
[  333.802149] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781048) returned 0x00000001 (completed_desc_count).
[  333.802150] engine_reg_dump(): C2H0: ioread32(0xffffa2fbc1781090) returned 0x00f83e1e (interrupt_enable_mask)
[  333.802151] engine_status_read(): C2H0: Status of SG DMA C2H engine:
[  333.802153] engine_status_read(): C2H0: ioread32(0xffffa2fbc1781040).
[  333.802155] engine_status_read(): C2H0: status = 0x00000006: IDLE DESC_STOPPED DESC_COMPLETED 
[  333.802156] engine_service_shutdown(): C2H0: engine just went idle, resetting RUN_STOP.
[  333.802157] xdma_engine_stop(): C2H0: xdma_engine_stop(engine=ffff934d335ace00)
[  333.802159] xdma_engine_stop(): C2H0: Stopping SG DMA C2H engine; writing 0x00f83e1e to 0xffffa2fbc1781004.
[  333.802160] xdma_engine_stop(): C2H0: xdma_engine_stop(C2H) done
[  333.802162] engine_service(): C2H0: desc_count = 1
[  333.802163] engine_service(): C2H0: head of queue transfer 0xffff934e14c2cb00 has 1 descriptors
[  333.802164] engine_service(): C2H0: Engine completed 1 desc, 1 not yet dequeued
[  333.802165] engine_service_final_transfer(): C2H0: engine C2H completed transfer
[  333.802166] engine_service_final_transfer(): C2H0: Completed transfer ID = 0xffff934e14c2cb00
[  333.802168] engine_service_final_transfer(): C2H0: *pdesc_completed=1, transfer->desc_num=1
[  333.802171] engine_service_resume(): C2H0: no pending transfers, C2H engine stays idle.
[  333.802173] transfer_data(): C2H0: transfer ffff934e14c2cb00 completed
[  333.802176] transfer_data(): C2H0: remain=0, done=4096
[  333.802177] char_sgdma_read_write(): C2H0: seq:1 char_sgdma_read_write() return=4096.
[  333.802178] interrupt_status():reg = ffffa2fbc1782000
[  333.802179] interrupt_status():&reg->user_int_enable = ffffa2fbc1782004
[  333.802181] interrupt_status():user_int_enable = 0x00000001
[  333.802182] interrupt_status():channel_int_enable = 0x00000003
[  333.802184] interrupt_status():user_int_request = 0x00000000
[  333.802186] interrupt_status():channel_int_request = 0x00000000
[  333.802187] interrupt_status():user_int_pending = 0x00000000
[  333.802189] interrupt_status():channel_int_pending = 0x00000000
[  333.802196] char_sgdma_close(): C2H0: char_sgdma_close(0xffff934e14bee428, 0xffff934e146e3b00)

 
 

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