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== Comment: #0 - Breno Henrique Leitao <brenohl@xxxxxxxxxx> - 2016-06-02 13:36:27 ==
---Problem Description---
We are developing a CAPI version of our FPGA gzip compression adapter. We use AFU directed mode to support multiple processes. Our testcase is opening a huge number of AFU context and sending small work-requests to the card. After n sec we close the AFU contexts.

What we observe is that after a while we get a set of AFU contexts,
which do not see interrupts anymore. We have traced the interrupt packet
(msix I guess) to the very low level of the FPGA logic and we strongly
assume that the interrupt packet goes out. Still the Linux kernel is not
seeing the interrupt and our application times out but the work request
was successfully finished.

In order to fix this bug, the follow patches are required:

2bc79ffcbb817873cc43d63118008ab75181b73d cxl: Poll for outstanding IRQs when detaching a context
d6776bba44d9752f6cdf640046070e71ee4bba7b cxl: Keep IRQ mappings on context teardown
 
This request is for Ubuntu 16.04.1

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64 bugnameltc-142126 severity-critical targetmilestone-inin---
-- 
CAPI: CGZIP AFU contexts do not receive interrupts after heavy afu open/close
https://bugs.launchpad.net/bugs/1588468
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