Re: [Qemu-ppc] [PULL 075/118] macio: handle non-block ATAPI DMA transfers

[BALATON Zoltan]

On Fri, 20 Jun 2014, Mark Cave-Ayland wrote:
> Zoltan, please can you test the attached patch to see if this still allows 
> MorphOS to boot?

Unfortunately it seems MorphOS cannot boot with this patch. It hangs while 
trying to read the TOC from the CD. Debug output with DEBUG_MACIO and 
DEBUG_DBDMA enabled shows:

DBDMA: writel 0x0000000000000d0c <= 0x00e51970
DBDMA: channel 0x1a reg 0x3
DBDMA: dbdma_cmdptr_load 0x00e51970

DBDMA: DBDMA_run_bh
DBDMA: writel 0x0000000000000d00 <= 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA:     status 0x00008400
DBDMA: readl 0x0000000000000d00 => 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA: DBDMA_run_bh
DBDMA: channel_run
dbdma_cmd 0x7f0997120f28
    req_count 0x0324
    command 0x3000
    phy_addr 0x00e7b0bc
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000
DBDMA: start_input
DBDMA: addr 0xe7b0bc key 0x0

non-block ATAPI DMA transfer size: 804
io_buffer_size = 0
remainder: 0 io->len: 0 size: 20
end of DMA
done DMA
DBDMA: dbdma_end
DBDMA: conditional_wait
DBDMA: dbdma_cmdptr_save 0x00e51970
DBDMA: xfer_status 0x00008400 res_count 0x0000
DBDMA: conditional_interrupt
DBDMA: conditional_branch
DBDMA: dbdma_cmdptr_load 0x00e51980
DBDMA: channel_run
dbdma_cmd 0x7f0997120f28
    req_count 0x0000
    command 0x7000
    phy_addr 0x00000000
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000

and no further ide activity from here whereas without the patch when it 
boots I see these logs:

DBDMA: writel 0x0000000000000d0c <= 0x00e50090
DBDMA: channel 0x1a reg 0x3
DBDMA: dbdma_cmdptr_load 0x00e50090

DBDMA: DBDMA_run_bh
DBDMA: writel 0x0000000000000d00 <= 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA:     status 0x00008400
DBDMA: readl 0x0000000000000d00 => 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA: DBDMA_run_bh
DBDMA: channel_run
dbdma_cmd 0x7f56695a7f28
    req_count 0x0324
    command 0x3000
    phy_addr 0x00e4f8fc
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000
DBDMA: start_input
DBDMA: addr 0xe4f8fc key 0x0

non-block ATAPI DMA transfer size: 20
end of non-block ATAPI DMA transfer
DBDMA: dbdma_end
DBDMA: conditional_wait
DBDMA: dbdma_cmdptr_save 0x00e50090
DBDMA: xfer_status 0x00008400 res_count 0x0324
DBDMA: conditional_interrupt
DBDMA: conditional_branch
DBDMA: dbdma_cmdptr_load 0x00e500a0
DBDMA: channel_run
dbdma_cmd 0x7f56695a7f28
    req_count 0x0000
    command 0x7000
    phy_addr 0x00000000
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000
DBDMA: writel 0x0000000000000d00 <= 0x98000000
DBDMA: channel 0x1a reg 0x0
DBDMA:     status 0x00000000
DBDMA: writel 0x0000000000000d0c <= 0x00e50090
DBDMA: channel 0x1a reg 0x3
DBDMA: dbdma_cmdptr_load 0x00e50090

DBDMA: writel 0x0000000000000d00 <= 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA:     status 0x00008400
DBDMA: readl 0x0000000000000d00 => 0x80008000
DBDMA: channel 0x1a reg 0x0
DBDMA: DBDMA_run_bh
DBDMA: channel_run
dbdma_cmd 0x7f56695a7f28
    req_count 0x0800
    command 0x3000
    phy_addr 0x00e8d7c0
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000
DBDMA: start_input
DBDMA: addr 0xe8d7c0 key 0x0

io_buffer_size = 0
remainder: 0 io->len: 2048 size: 2048
io->len = 0x800
set remainder to: 0
sector_num=64 size=2048, cmd_cmd=0
io_buffer_size = 0x800
remainder: 0 io->len: 0 size: 0
end of transfer
end of DMA
done DMA
DBDMA: dbdma_end
DBDMA: conditional_wait
DBDMA: dbdma_cmdptr_save 0x00e50090
DBDMA: xfer_status 0x00008400 res_count 0x0000
DBDMA: conditional_interrupt
DBDMA: conditional_branch
DBDMA: dbdma_cmdptr_load 0x00e500a0
DBDMA: channel_run
dbdma_cmd 0x7f56695a7f28
    req_count 0x0000
    command 0x7000
    phy_addr 0x00000000
    cmd_dep 0x00000000
    res_count 0x0000
    xfer_status 0x0000

and a lot of similar stuff after this. If this is not enough to understand 
the problem and you need more details please tell me what to look for.

Regards,
BALATON Zoltan