Hi,
There is a driver developed by EmbeddedTS (the board is Marvell
armada-385, dual core processor) that tries to allocate 32 MSI
interrupts, using pci_alloc_irq_vectors(..,32,32,...). When I ran the
Kernel (4.14 NON RT) provided by them, it worked fine, but when I
recompiled the kernel (4.19.249 using the RT_FULL options), it didn't,
returning -ENOSPC.
In RT_FULL Kernel:
- First fact, when I ran pci_msi_vec_count, it returned 32.
- Second, if I changed to 16, calling
pci_alloc_irq_vectors(..,16,16,...), it worked.
I traced this kernel and I found that:
pci_alloc_irq_vectors_affinity
__pci_enable_msi_range
msi_capability_init
pci_msi_setup_msi_irqs
msi_domain_alloc_irqs
__irq_domain_alloc_irqs
irq_domain_alloc_descs
Then I stopped here...
I searched on the Internet, but I couldn't find anything.
Has someone had a similar problem?
Is there something that I missed? Some configuration??
Thanks
--
Danilo C. Zanella
Radio Astronomy Group / IAG
University of Sao Paulo
Rua do Matão, 1226 - Cidade Universitária São Paulo - SP - Brasil - 05508-090
Tel.: +55 11 3091-2743
