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, 57 insertions, 0 deletions

diff --git a/tools/testing/vma/main.c b/tools/testing/vma/main.c
new file mode 100644
index 000000000..18338f5d2
--- /dev/null
+++ b/tools/testing/vma/main.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "shared.h"
+/*
+ * Directly import the VMA implementation here. Our vma_internal.h wrapper
+ * provides userland-equivalent functionality for everything vma.c uses.
+ */
+#include "../../../mm/vma_init.c"
+#include "../../../mm/vma_exec.c"
+#include "../../../mm/vma.c"
+
+/* Tests are included directly so they can test static functions in mm/vma.c. */
+#include "tests/merge.c"
+#include "tests/mmap.c"
+#include "tests/vma.c"
+
+int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
+
+/* Helper functions which utilise static kernel functions. */
+
+struct vm_area_struct *merge_existing(struct vma_merge_struct *vmg)
+{
+	struct vm_area_struct *vma;
+
+	vma = vma_merge_existing_range(vmg);
+	if (vma)
+		vma_assert_attached(vma);
+	return vma;
+}
+
+int attach_vma(struct mm_struct *mm, struct vm_area_struct *vma)
+{
+	int res;
+
+	res = vma_link(mm, vma);
+	if (!res)
+		vma_assert_attached(vma);
+	return res;
+}
+
+/* Main test running which invokes tests/ *.c runners. */
+int main(void)
+{
+	int num_tests = 0, num_fail = 0;
+
+	maple_tree_init();
+	vma_state_init();
+
+	run_merge_tests(&num_tests, &num_fail);
+	run_mmap_tests(&num_tests, &num_fail);
+	run_vma_tests(&num_tests, &num_fail);
+
+	printf("%d tests run, %d passed, %d failed.\n",
+	       num_tests, num_tests - num_fail, num_fail);
+
+	return num_fail == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}