Merge branch 'pci/endpoint'

- Add endpoint controller APIs for use by function drivers to discover
  auxiliary blocks like DMA engines (Koichiro Den)

- Remember DesignWare eDMA engine base/size and expose them via the EPC
  aux-resource API (Koichiro Den)

- Refactor endpoint doorbell allocation to allow non-MSI doorbells
  (Koichiro Den)

- Add endpoint embedded doorbell fallback, used if MSI allocation fails
  (Koichiro Den)

- Validate BAR index and remove dead BAR read in endpoint doorbell test
  (Carlos Bilbao)

- Unwind MSI/MSI-X vectors if NTB initialization fails part-way through
  (Koichiro Den)

- Cache sleepable pci_irq_vector() value at ISR setup to avoid calling it
  from hardirq context (Koichiro Den)

- Validate doorbell count when configuring NTB and vNTB doorbells
  (Manivannan Sadhasivam)

- Call sleepable pci_epc_raise_irq() from a work item instead of atomic
  context, e.g., when setting bits in NTB peer doorbells in the
  ntb_peer_db_set() path (Koichiro Den)

- Report 0-based vNTB doorbell vector to account for link event 0 and
  historically skipped slot 1 (Koichiro Den)

- Reject unusable vNTB doorbell counts, e.g., if they don't allow space for
  link event 0 and historically skipped slot 1 (Koichiro Den)

- Prevent configfs writes to vNTB db_count and other values that are
  already in use after EPC attach (Koichiro Den)

- Account for vNTB db_valid reserved slots (link event 0 and historically
  skipped slot 1) so they don't appear as valid doorbells (Koichiro Den)

- Implement vNTB .db_vector_count()/mask() for doorbells so clients can use
  multiple vectors and avoid thundering herds (Koichiro Den)

- Report 0-based NTB doorbell vector to account for link event 0 and
  historically skipped slot 1 (Koichiro Den)

- Fix doorbell bitmask and IRQ vector handling to clear only specified
  bits, use the correct vector for non-contiguous Linux IRQ numbers, and
  validate incoming vectors (Koichiro Den)

- Implement NTB .db_vector_count()/mask() for doorbells so clients can use
  multiple vectors (Koichiro Den)

* pci/endpoint:
  NTB: epf: Implement .db_vector_count()/mask() for doorbells
  NTB: epf: Fix doorbell bitmask and IRQ vector handling
  NTB: epf: Report 0-based doorbell vector via ntb_db_event()
  NTB: epf: Make db_valid_mask cover only real doorbell bits
  NTB: epf: Document legacy doorbell slot offset in ntb_epf_peer_db_set()
  PCI: endpoint: pci-epf-vntb: Implement .db_vector_count()/mask() for doorbells
  PCI: endpoint: pci-epf-vntb: Exclude reserved slots from db_valid_mask
  PCI: endpoint: pci-epf-vntb: Guard configfs writes after EPC attach
  PCI: endpoint: pci-epf-vntb: Reject unusable doorbell counts
  PCI: endpoint: pci-epf-vntb: Report 0-based doorbell vector via ntb_db_event()
  PCI: endpoint: pci-epf-vntb: Defer pci_epc_raise_irq() out of atomic context
  PCI: endpoint: pci-epf-vntb: Document legacy MSI doorbell offset
  PCI: endpoint: pci-epf-ntb: Add check to detect 'db_count' value of 0
  PCI: endpoint: pci-epf-vntb: Add check to detect 'db_count' value of 0
  NTB: epf: Avoid calling pci_irq_vector() from hardirq context
  NTB: epf: Fix request_irq() unwind in ntb_epf_init_isr()
  misc: pci_endpoint_test: Remove dead BAR read before doorbell trigger
  misc: pci_endpoint_test: Validate BAR index in doorbell test
  PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback
  PCI: endpoint: pci-epf-test: Reuse pre-exposed doorbell targets
  PCI: endpoint: pci-epf-vntb: Reuse pre-exposed doorbells and IRQ flags
  PCI: endpoint: pci-ep-msi: Refactor doorbell allocation for new backends
  PCI: dwc: ep: Expose integrated eDMA resources via EPC aux-resource API
  PCI: dwc: Record integrated eDMA register window
  PCI: endpoint: Add auxiliary resource query API