Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 219 insertions, 0 deletions

diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
new file mode 100644
index 000000000..66a774d27
--- /dev/null
+++ b/include/linux/io-mapping.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.com>
+ */
+
+#ifndef _LINUX_IO_MAPPING_H
+#define _LINUX_IO_MAPPING_H
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/bug.h>
+#include <linux/io.h>
+#include <linux/pgtable.h>
+#include <asm/page.h>
+
+/*
+ * The io_mapping mechanism provides an abstraction for mapping
+ * individual pages from an io device to the CPU in an efficient fashion.
+ *
+ * See Documentation/driver-api/io-mapping.rst
+ */
+
+struct io_mapping {
+	resource_size_t base;
+	unsigned long size;
+	pgprot_t prot;
+	void __iomem *iomem;
+};
+
+#ifdef CONFIG_HAVE_ATOMIC_IOMAP
+
+#include <linux/pfn.h>
+#include <asm/iomap.h>
+/*
+ * For small address space machines, mapping large objects
+ * into the kernel virtual space isn't practical. Where
+ * available, use fixmap support to dynamically map pages
+ * of the object at run time.
+ */
+
+static inline struct io_mapping *
+io_mapping_init_wc(struct io_mapping *iomap,
+		   resource_size_t base,
+		   unsigned long size)
+{
+	pgprot_t prot;
+
+	if (iomap_create_wc(base, size, &prot))
+		return NULL;
+
+	iomap->base = base;
+	iomap->size = size;
+	iomap->prot = prot;
+	return iomap;
+}
+
+static inline void
+io_mapping_fini(struct io_mapping *mapping)
+{
+	iomap_free(mapping->base, mapping->size);
+}
+
+/* Atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+			 unsigned long offset)
+{
+	resource_size_t phys_addr;
+
+	BUG_ON(offset >= mapping->size);
+	phys_addr = mapping->base + offset;
+	preempt_disable();
+	pagefault_disable();
+	return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
+}
+
+static inline void
+io_mapping_unmap_atomic(void __iomem *vaddr)
+{
+	kunmap_local_indexed((void __force *)vaddr);
+	pagefault_enable();
+	preempt_enable();
+}
+
+static inline void __iomem *
+io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset)
+{
+	resource_size_t phys_addr;
+
+	BUG_ON(offset >= mapping->size);
+	phys_addr = mapping->base + offset;
+	return __iomap_local_pfn_prot(PHYS_PFN(phys_addr), mapping->prot);
+}
+
+static inline void io_mapping_unmap_local(void __iomem *vaddr)
+{
+	kunmap_local_indexed((void __force *)vaddr);
+}
+
+static inline void __iomem *
+io_mapping_map_wc(struct io_mapping *mapping,
+		  unsigned long offset,
+		  unsigned long size)
+{
+	resource_size_t phys_addr;
+
+	BUG_ON(offset >= mapping->size);
+	phys_addr = mapping->base + offset;
+
+	return ioremap_wc(phys_addr, size);
+}
+
+static inline void
+io_mapping_unmap(void __iomem *vaddr)
+{
+	iounmap(vaddr);
+}
+
+#else  /* HAVE_ATOMIC_IOMAP */
+
+#include <linux/uaccess.h>
+
+/* Create the io_mapping object*/
+static inline struct io_mapping *
+io_mapping_init_wc(struct io_mapping *iomap,
+		   resource_size_t base,
+		   unsigned long size)
+{
+	iomap->iomem = ioremap_wc(base, size);
+	if (!iomap->iomem)
+		return NULL;
+
+	iomap->base = base;
+	iomap->size = size;
+	iomap->prot = pgprot_writecombine(PAGE_KERNEL);
+
+	return iomap;
+}
+
+static inline void
+io_mapping_fini(struct io_mapping *mapping)
+{
+	iounmap(mapping->iomem);
+}
+
+/* Non-atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_wc(struct io_mapping *mapping,
+		  unsigned long offset,
+		  unsigned long size)
+{
+	return mapping->iomem + offset;
+}
+
+static inline void
+io_mapping_unmap(void __iomem *vaddr)
+{
+}
+
+/* Atomic map/unmap */
+static inline void __iomem *
+io_mapping_map_atomic_wc(struct io_mapping *mapping,
+			 unsigned long offset)
+{
+	preempt_disable();
+	pagefault_disable();
+	return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
+}
+
+static inline void
+io_mapping_unmap_atomic(void __iomem *vaddr)
+{
+	io_mapping_unmap(vaddr);
+	pagefault_enable();
+	preempt_enable();
+}
+
+static inline void __iomem *
+io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset)
+{
+	return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
+}
+
+static inline void io_mapping_unmap_local(void __iomem *vaddr)
+{
+	io_mapping_unmap(vaddr);
+}
+
+#endif /* !HAVE_ATOMIC_IOMAP */
+
+static inline struct io_mapping *
+io_mapping_create_wc(resource_size_t base,
+		     unsigned long size)
+{
+	struct io_mapping *iomap;
+
+	iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
+	if (!iomap)
+		return NULL;
+
+	if (!io_mapping_init_wc(iomap, base, size)) {
+		kfree(iomap);
+		return NULL;
+	}
+
+	return iomap;
+}
+
+static inline void
+io_mapping_free(struct io_mapping *iomap)
+{
+	io_mapping_fini(iomap);
+	kfree(iomap);
+}
+
+#endif /* _LINUX_IO_MAPPING_H */
+
+int io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma,
+		unsigned long addr, unsigned long pfn, unsigned long size);