On 03.06.19 15:34, Cornelia Huck wrote:
On Mon, 3 Jun 2019 14:57:30 +0200
Halil Pasic <pasic@xxxxxxxxxxxxx> wrote:
On Mon, 3 Jun 2019 14:09:02 +0200
Michael Mueller <mimu@xxxxxxxxxxxxx> wrote:
@@ -224,6 +226,8 @@ struct subchannel *css_alloc_subchannel(struct subchannel_id schid,
INIT_WORK(&sch->todo_work, css_sch_todo);
sch->dev.release = &css_subchannel_release;
device_initialize(&sch->dev);
It might be helpful to add a comment why you use 31 bit here...
@Halil, please let me know what comment you prefere here...
How about?
/*
* The physical addresses of some the dma structures that
* can belong to a subchannel need to fit 31 bit width (examples ccw,).
*/
"e.g. ccw"?
+ sch->dev.coherent_dma_mask = DMA_BIT_MASK(31);
+ sch->dev.dma_mask = &sch->dev.coherent_dma_mask;
return sch;
err:
@@ -899,6 +903,8 @@ static int __init setup_css(int nr)
dev_set_name(&css->device, "css%x", nr);
css->device.groups = cssdev_attr_groups;
css->device.release = channel_subsystem_release;
...and 64 bit here.
and here.
/*
* We currently allocate notifier bits with this (using css->device
* as the device argument with the DMA API), and are fine with 64 bit
* addresses.
*/
Thanks, that makes things hopefully clearer if we look at it some time
in the future ;)
Applied both with with requested change.
Michael
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