In this patchset we want to enable the MANA driver to be able to allocate MSI-X vectors in PCI dynamically. The first patch exports pci_msix_prepare_desc() in PCI to be able to correctly prepare descriptors for dynamically added MSI-X vectors. The second patch adds the support of dynamic vector allocation in pci-hyperv PCI controller by enabling the MSI_FLAG_PCI_MSIX_ALLOC_DYN flag and using the pci_msix_prepare_desc() exported in first patch. The third patch adds a detailed description of the irq_setup(), to help understand the function design better. The fourth patch is a preparation patch for mana changes to support dynamic IRQ allocation. It contains changes in irq_setup() to allow skipping first sibling CPU sets, in case certain IRQs are already affinitized to them. The fifth patch has the changes in MANA driver to be able to allocate MSI-X vectors dynamically. If the support does not exist it defaults to older behavior. Since this patchset has patches from PCI and net tree, I am not entirely sure what should be the target tree. Any suggestions/recommendations on the same are welcomed. --- Changes in v5 * Added Yury as Author of the 3rd patch * Fixed base commit information in the cover letter * Correctly initialized start_irqs, so that it is cleaned properly * rearranged the cpu_lock to minimize the critical section --- Change in v4 * add a patch describing the functionality of irq_setup() through a comment * In irq_setup(), avoid using a label next_cpumask: * modify the changes in MANA patch about restructuring the error handling path in mana_gd_setup_dyn_irqs() * modify the mana_gd_setup_irqs() to simplify handling around start_irq_index * add warning if an invalid gic is returned * place the xa_destroy() cleanup in mana_gd_remove --- Changes in v3 * split the 3rd patch into preparation patch around irq_setup() and changes in mana driver to allow dynamic IRQ allocation * Add arm64 support for dynamic MSI-X allocation in pci_hyperv controller --- Changes in v2 * split the first patch into two(exporting the preapre_desc func and using the function and flag in pci-hyperv) * replace 'pci vectors' by 'MSI-X vectors' * Change the cover letter description to align with changes made --- Shradha Gupta (5): PCI/MSI: Export pci_msix_prepare_desc() for dynamic MSI-X allocations PCI: hv: Allow dynamic MSI-X vector allocation net: mana: explain irq_setup() algorithm net: mana: Allow irq_setup() to skip cpus for affinity net: mana: Allocate MSI-X vectors dynamically .../net/ethernet/microsoft/mana/gdma_main.c | 363 ++++++++++++++---- drivers/pci/controller/pci-hyperv.c | 3 +- drivers/pci/msi/irqdomain.c | 5 +- include/linux/msi.h | 2 + include/net/mana/gdma.h | 8 +- 5 files changed, 295 insertions(+), 86 deletions(-) base-commit: 2c7e4a2663a1ab5a740c59c31991579b6b865a26 -- 2.34.1
