Re: [Qemu-block] [Qemu-devel] [PATCH v5 06/11] esp: add pseudo-DMA as used by Macintosh

[Mark Cave-Ayland]

On 30/10/2018 06:47, Hervé Poussineau wrote:

> Le 29/10/2018 à 14:39, Mark Cave-Ayland a écrit :
>> From: Laurent Vivier <address@hidden>
>>
>> Co-developed-by: Mark Cave-Ayland <address@hidden>
>> Signed-off-by: Mark Cave-Ayland <address@hidden>
>> Signed-off-by: Laurent Vivier <address@hidden>
>> ---
>>   hw/scsi/esp.c         | 292 
>> +++++++++++++++++++++++++++++++++++++++++++++-----
>>   include/hw/scsi/esp.h |   7 ++
>>   2 files changed, 270 insertions(+), 29 deletions(-)
>>
> 
> [...]
> 
>>   @@ -409,6 +564,7 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
>>               s->ti_size--;
>>               s->rregs[ESP_FIFO] = s->ti_buf[s->ti_rptr++];
>>           }
>> +        esp_raise_irq(s);
>>           if (s->ti_rptr == s->ti_wptr) {
>>               s->ti_rptr = 0;
>>               s->ti_wptr = 0;
> 
> You're now raising irq (not drq) when reading registers. In my opinion, this 
> deserves
> its own patch with an explanation.

Oooh good spot. Laurent, can you explain a bit more as to how the pseudo-DMA is 
wired
up for ESP?


ATB,

Mark.