libie: add PCI device initialization helpers to libie

idpf and ixd drivers serve different PCI functions on the same device,
therefore their PCI configuration flow is very similar.

Add support functions for idpf and ixd to configure PCI functionality and
access MMIO space. Add a mapping list which can be traversed by a driver,
e.g. to pass certain I/O mappings to the auxbus devices. Such list is also
traversed by the libie_pci_get_mmio_addr() helper, which allows for easier
memory access.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Phani R Burra <phani.r.burra@intel.com>
Co-developed-by: Victor Raj <victor.raj@intel.com>
Signed-off-by: Victor Raj <victor.raj@intel.com>
Co-developed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Tested-by: Bharath R <bharath.r@intel.com>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Co-developed-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/net/intel/libie/pci.h b/include/linux/net/intel/libie/pci.h
new file mode 100644
index 000000000000..effd072c55c8
--- /dev/null
+++ b/include/linux/net/intel/libie/pci.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (C) 2025 Intel Corporation */
+
+#ifndef __LIBIE_PCI_H
+#define __LIBIE_PCI_H
+
+#include <linux/pci.h>
+
+/**
+ * struct libie_pci_mmio_region - structure for MMIO region info
+ * @list: used to add a MMIO region to the list of MMIO regions in
+ *	  libie_mmio_info
+ * @addr: virtual address of MMIO region start
+ * @offset: start offset of the MMIO region
+ * @size: size of the MMIO region
+ * @bar_idx: BAR index to which the MMIO region belongs to
+ */
+struct libie_pci_mmio_region {
+	struct list_head	list;
+	void __iomem		*addr;
+	resource_size_t		offset;
+	resource_size_t		size;
+	u16			bar_idx;
+};
+
+/**
+ * struct libie_mmio_info - contains list of MMIO regions
+ * @pdev: PCI device pointer
+ * @mmio_list: list of MMIO regions
+ */
+struct libie_mmio_info {
+	struct pci_dev		*pdev;
+	struct list_head	mmio_list;
+};
+
+#define libie_pci_map_mmio_region(mmio_info, offset, size, ...)	\
+	__libie_pci_map_mmio_region(mmio_info, offset, size,		\
+				     COUNT_ARGS(__VA_ARGS__), ##__VA_ARGS__)
+
+#define libie_pci_get_mmio_addr(mmio_info, offset, ...)		\
+	__libie_pci_get_mmio_addr(mmio_info, offset,			\
+				   COUNT_ARGS(__VA_ARGS__), ##__VA_ARGS__)
+
+bool __libie_pci_map_mmio_region(struct libie_mmio_info *mmio_info,
+				 resource_size_t offset, resource_size_t size,
+				 int num_args, ...);
+void __iomem *__libie_pci_get_mmio_addr(struct libie_mmio_info *mmio_info,
+					resource_size_t offset,
+					int num_args, ...);
+void libie_pci_unmap_all_mmio_regions(struct libie_mmio_info *mmio_info);
+void libie_pci_unmap_fltr_regs(struct libie_mmio_info *mmio_info,
+			       bool (*fltr)(struct libie_mmio_info *mmio_info,
+					    struct libie_pci_mmio_region *reg));
+int libie_pci_init_dev(struct pci_dev *pdev);
+
+#endif /* __LIBIE_PCI_H */