[PATCH v5 0/5] Allow dyn MSI-X vector allocation of MANA

[Shradha Gupta]

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