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, 86 insertions, 0 deletions

diff --git a/drivers/comedi/comedi_internal.h b/drivers/comedi/comedi_internal.h
new file mode 100644
index 000000000..41a3b09f8
--- /dev/null
+++ b/drivers/comedi/comedi_internal.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _COMEDI_INTERNAL_H
+#define _COMEDI_INTERNAL_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+/*
+ * various internal comedi stuff
+ */
+
+struct comedi_buf_map;
+struct comedi_devconfig;
+struct comedi_device;
+struct comedi_insn;
+struct comedi_rangeinfo;
+struct comedi_subdevice;
+struct device;
+
+int do_rangeinfo_ioctl(struct comedi_device *dev,
+		       struct comedi_rangeinfo *it);
+struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device);
+void comedi_release_hardware_device(struct device *hardware_device);
+int comedi_alloc_subdevice_minor(struct comedi_subdevice *s);
+void comedi_free_subdevice_minor(struct comedi_subdevice *s);
+
+int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
+		     unsigned long new_size);
+void comedi_buf_reset(struct comedi_subdevice *s);
+bool comedi_buf_is_mmapped(struct comedi_subdevice *s);
+void comedi_buf_map_get(struct comedi_buf_map *bm);
+int comedi_buf_map_put(struct comedi_buf_map *bm);
+int comedi_buf_map_access(struct comedi_buf_map *bm, unsigned long offset,
+			  void *buf, int len, int write);
+struct comedi_buf_map *
+comedi_buf_map_from_subdev_get(struct comedi_subdevice *s);
+unsigned int comedi_buf_write_n_available(struct comedi_subdevice *s);
+unsigned int comedi_buf_write_n_allocated(struct comedi_subdevice *s);
+unsigned int _comedi_buf_write_alloc(struct comedi_subdevice *s,
+				     unsigned int nbytes);
+unsigned int _comedi_buf_write_free(struct comedi_subdevice *s,
+				    unsigned int nbytes);
+unsigned int _comedi_buf_read_n_available(struct comedi_subdevice *s);
+unsigned int _comedi_buf_read_alloc(struct comedi_subdevice *s,
+				    unsigned int nbytes);
+unsigned int _comedi_buf_read_free(struct comedi_subdevice *s,
+				   unsigned int nbytes);
+void _comedi_inc_scan_progress(struct comedi_subdevice *s,
+			       unsigned int num_bytes);
+void _comedi_event(struct comedi_device *dev, struct comedi_subdevice *s);
+void comedi_device_cancel_all(struct comedi_device *dev);
+bool comedi_can_auto_free_spriv(struct comedi_subdevice *s);
+
+extern unsigned int comedi_default_buf_size_kb;
+extern unsigned int comedi_default_buf_maxsize_kb;
+
+/* drivers.c */
+
+extern struct comedi_driver *comedi_drivers;
+extern struct mutex comedi_drivers_list_lock;
+
+int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s,
+	       struct comedi_insn *insn, unsigned int *data);
+
+void comedi_device_detach_locked(struct comedi_device *dev);
+void comedi_device_detach(struct comedi_device *dev);
+int comedi_device_attach(struct comedi_device *dev,
+			 struct comedi_devconfig *it);
+
+#ifdef CONFIG_PROC_FS
+
+/* proc.c */
+
+void comedi_proc_init(void);
+void comedi_proc_cleanup(void);
+#else
+static inline void comedi_proc_init(void)
+{
+}
+
+static inline void comedi_proc_cleanup(void)
+{
+}
+#endif
+
+#endif /* _COMEDI_INTERNAL_H */