Hi Jason,
On 4/23/2020 12:49 PM, Jason Gunthorpe wrote:
On Thu, Apr 23, 2020 at 12:17:50PM -0700, Dan Williams wrote:
Per Megha's follow-up can you send the details about that other device
and help clear a path for a device-specific MSI addr/data table
format. Ever since HMM I've been sensitive, perhaps overly-sensitive,
to claims about future upstream users. The fact that you have an
additional use case is golden for pushing this into a common area and
validating the scope of the proposed API.
I think I said it at plumbers, but yes, we are interested in this, and
would like dynamic MSI-like interrupts available to the driver (what
Intel calls IMS)
So basically you are looking for a way to dynamically allocate the
platform-msi interrupts, correct?
Since I don't have access to any of the platform-msi devices, it is hard
for me to test this code for other drivers expect idxd for now.
Once I submit the next round of patches, after addressing all the
comments, would it be possible for you to test this code for any of your
devices?
It is something easy enough to illustrate with any RDMA device really,
just open a MR against the addr and use RDMA_WRITE to trigger the
data. It should trigger a Linux IRQ. Nothing else should be needed.
Jason
