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, 36 insertions, 0 deletions

diff --git a/Documentation/gpu/driver-uapi.rst b/Documentation/gpu/driver-uapi.rst
new file mode 100644
index 000000000..627fc68c7
--- /dev/null
+++ b/Documentation/gpu/driver-uapi.rst
@@ -0,0 +1,36 @@
+===============
+DRM Driver uAPI
+===============
+
+.. contents::
+
+drm/i915 uAPI
+=============
+
+.. kernel-doc:: include/uapi/drm/i915_drm.h
+
+drm/nouveau uAPI
+================
+
+VM_BIND / EXEC uAPI
+-------------------
+
+.. kernel-doc:: drivers/gpu/drm/nouveau/nouveau_exec.c
+    :doc: Overview
+
+.. kernel-doc:: include/uapi/drm/nouveau_drm.h
+
+drm/panthor uAPI
+================
+
+.. kernel-doc:: include/uapi/drm/panthor_drm.h
+
+drm/xe uAPI
+===========
+
+.. kernel-doc:: include/uapi/drm/xe_drm.h
+
+drm/asahi uAPI
+================
+
+.. kernel-doc:: include/uapi/drm/asahi_drm.h