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, 42 insertions, 0 deletions

diff --git a/fs/efs/file.c b/fs/efs/file.c
new file mode 100644
index 000000000..9153dfe79
--- /dev/null
+++ b/fs/efs/file.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * file.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/buffer_head.h>
+#include "efs.h"
+
+int efs_get_block(struct inode *inode, sector_t iblock,
+		  struct buffer_head *bh_result, int create)
+{
+	int error = -EROFS;
+	long phys;
+
+	if (create)
+		return error;
+	if (iblock >= inode->i_blocks)
+		return 0;
+
+	phys = efs_map_block(inode, iblock);
+	if (phys)
+		map_bh(bh_result, inode->i_sb, phys);
+	return 0;
+}
+
+int efs_bmap(struct inode *inode, efs_block_t block) {
+
+	if (block < 0) {
+		pr_warn("%s(): block < 0\n", __func__);
+		return 0;
+	}
+
+	/* are we about to read past the end of a file ? */
+	if (!(block < inode->i_blocks))
+		return 0;
+
+	return efs_map_block(inode, block);
+}