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

From: Mark Cave-Ayland
Subject: Re: [Qemu-devel] [PULL 075/118] macio: handle non-block ATAPI DMA transfers
Date: Fri, 20 Jun 2014 20:27:36 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0 
On 20/06/14 20:17, BALATON Zoltan wrote:


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:
And also with ATAPI debugging enabled? I suspect the problem is with the interaction between the DMA/ATAPI systems again. 


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.
I'm afraid as you're the only person that can boot MorphOS this far then we need you to diagnose and suggest a suitable alternative by comparing the before and after output. Since MacOS is already a supported client then if no solution can be found then it is likely that this patch will be reverted :(
In order for a patch to be accepted then it will need to both pass your MorphOS tests and also boot darwinppc-602.iso which should cover the two cases of either the ATAPI or the DMA transfer occurring first. 


HTH,

Mark.
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