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<a href="https://gitlab.rtems.org/zhugengyu2023">geng zhu</a> created an issue: <a href="https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/71">#71</a>
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<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Summary</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Hello all, I am working on merging freebsd-14 pcie driver to rtems-libbsd (6-freebsd-14, <a href="https://gitee.com/phytium_embedded/rtems-libbsd/blob/6-freebsd-14/freebsd/sys/dev/pci/pci_host_generic.c" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://gitee.com/phytium_embedded/rtems-libbsd/blob/6-freebsd-14/freebsd/sys/dev/pci/pci_host_generic.c</a>), basically for xhci and nvme support，my platform is aarch64，and MSI/MSIx supported by Gicv3 ITS.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">My issue is that every MSI/ITS interrupt handling will experience disable/enable procdure, which is time consuming (not like SPI interrupt, ITS interrupt needs to send sync command and flush cache in every disable/enable process), I tried to ignore the disable/enable actions but not working (it seems like pci device interrupt ACK action in irqserver thread keeps preempted by interrupt)</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">P.S. My gicv3 and gicv3 its driver merge from zephyr and basiclly works in RTEMS now, except above issue</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Does any one give me some idea, I'm trying on</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">disable interrupt nesting in rtems kerenl</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">ack pci interrupt in top-half</li>
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<a href="#steps-to-reproduce" aria-hidden="true" class="anchor" id="user-content-steps-to-reproduce" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Steps to reproduce</h2>
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