PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
new file mode 100644
index 000000000..beb054c31
--- /dev/null
+++ b/drivers/thunderbolt/Makefile
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+ccflags-y := -I$(src)
+obj-${CONFIG_USB4} := thunderbolt.o
+thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o pci.o path.o tunnel.o eeprom.o
+thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
+thunderbolt-objs += usb4_port.o nvm.o retimer.o quirks.o clx.o
+
+thunderbolt-${CONFIG_ACPI} += acpi.o
+thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o
+thunderbolt-$(CONFIG_USB4_CONFIGFS) += configfs.o
+thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o
+CFLAGS_test.o += $(DISABLE_STRUCTLEAK_PLUGIN)
+
+thunderbolt_dma_test-${CONFIG_USB4_DMA_TEST} += dma_test.o
+obj-$(CONFIG_USB4_DMA_TEST) += thunderbolt_dma_test.o
+
+thunderbolt_stream-${CONFIG_USB4_STREAM} += stream.o
+obj-$(CONFIG_USB4_STREAM) += thunderbolt_stream.o