[Nouveau] Interrupt setting

[Shinpei KATO]

Hi,

I am responding to myself...
Interrupts now work; I should have set the
NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY_STYLE_WRITE_LE_AWAKEN flag every time a
command is sent.
In fact, I thought this flag tells GPU to notify us of when DMA transfers
are done, but I got PGRAPH_NOTIFY interrupts by this.
It sounds to me that they notify of when GPU operations are done rather than
DMA transfers.
# PGRAPH_BUFFER_NOTIFY sounds more related to DMA transfers.

Is my understanding wrong?
I appreciate any comments or information about this.

Best regards,
- Shinpei

> -----Original Message-----
> From: nouveau-bounces at lists.freedesktop.org
> [mailto:nouveau-bounces at lists.freedesktop.org] On Behalf Of Shinpei KATO
> Sent: Friday, March 12, 2010 7:21 AM
> To: nouveau at lists.freedesktop.org
> Subject: [Nouveau] Interrupt setting
> 
> Hi all,
> 
> I am a Nouveau user on FC12 with GeForce 9500GT.
> I have read the Nouveau wiki documents, and they imply that there are ways
> to set GPU to send interrupts to CPU, when we want to be notified for
> something, e.g., when DMA transfer or GPU operation is completed.
> By default, when I run an OpenGL demo application from Gallium3D, the
driver
> gets no interrupts from GPU in nouveau_irq_handler(), except that it gets
> one NV_PFIFO_INTR_CACHE_ERROR interrupt right after the FIFO is allocated.
> According to the wiki docs, I need to set
> NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY_STYLE_WRITE_LE_AWAKEN into the
> 'notify'
> field of an object in a channel.
> Hence, I tried seting a flag to a DMA notifier in nouveau_dma_init():
> 
> // seems entry[1] is related to a DMA notifier?
> nv_wo32(dev, m2mf, 1,
> NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY_STYLE_WRITE_LE_AWAKEN);
> 
> I also tried sending some command:
> 
> // guess this is a very wrong way ;-)
> BEGIN_RING(chan, NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY, 1);
> OUT_RING(chan,
> NV_MEMORY_TO_MEMORY_FORMAT_NOTIFY_STYLE_WRITE_LE_AWAKEN);
> 
> But they both did not work...
> How can we set GPU to send interrupts to CPU?
> I would appreciate your comments.
> 
> Thanks,
> - Shinpei
> 
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