// SPDX-License-Identifier: GPL-2.0/* * arch/alpha/kernel/pci-sysfs.c * * Copyright (C) 2009 Ivan Kokshaysky * * Alpha PCI resource files. * * Loosely based on generic HAVE_PCI_MMAP implementation in * drivers/pci/pci-sysfs.c */ #include <linux/sched.h>#include <linux/security.h>#include <linux/pci.h> static int hose_mmap_page_range(struct pci_controller *hose,				struct vm_area_struct *vma,				enum pci_mmap_state mmap_type, int sparse){	unsigned long base; 	if (mmap_type == pci_mmap_mem)		base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;	else		base = sparse ? hose->sparse_io_base : hose->dense_io_base; 	vma->vm_pgoff += base >> PAGE_SHIFT; 	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,				  vma->vm_end - vma->vm_start,				  vma->vm_page_prot);} static int __pci_mmap_fits(struct pci_dev *pdev, int num,			   struct vm_area_struct *vma, int sparse){	resource_size_t len = pci_resource_len(pdev, num);	unsigned long nr, start, size;	int shift = sparse ? 5 : 0; 	if (!len)		return 0; 	nr = vma_pages(vma);	start = vma->vm_pgoff;	size = ((len - 1) >> (PAGE_SHIFT - shift)) + 1; 	return start < size && size - start >= nr;} /** * pci_mmap_resource - map a PCI resource into user memory space * @kobj: kobject for mapping * @attr: struct bin_attribute for the file being mapped * @vma: struct vm_area_struct passed into the mmap * @sparse: address space type * * Use the bus mapping routines to map a PCI resource into userspace. * * Return: %0 on success, negative error code otherwise */static int pci_mmap_resource(struct kobject *kobj,			     const struct bin_attribute *attr,			     struct vm_area_struct *vma, int sparse){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));	int barno = (unsigned long)attr->private;	enum pci_mmap_state mmap_type;	struct pci_bus_region bar;	int ret; 	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);	if (ret)		return ret; 	if (pci_resource_is_mem(pdev, barno) &&	    iomem_is_exclusive(pci_resource_start(pdev, barno)))		return -EINVAL; 	if (!__pci_mmap_fits(pdev, barno, vma, sparse))		return -EINVAL; 	pcibios_resource_to_bus(pdev->bus, &bar, pci_resource_n(pdev, barno));	vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));	mmap_type = pci_resource_is_mem(pdev, barno) ? pci_mmap_mem : pci_mmap_io; 	return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);} static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj,				    const struct bin_attribute *attr,				    struct vm_area_struct *vma){	return pci_mmap_resource(kobj, attr, vma, 1);} static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj,				   const struct bin_attribute *attr,				   struct vm_area_struct *vma){	return pci_mmap_resource(kobj, attr, vma, 0);} #define __pci_dev_resource_attr(_suffix, _bar, _name, _mmap)	\static const struct bin_attribute				\pci_dev_resource##_bar##_suffix##_attr = {			\	.attr = { .name = __stringify(_name), .mode = 0600 },	\	.private = (void *)(unsigned long)(_bar),		\	.mmap = (_mmap),					\} #define pci_dev_resource_attr(_bar)			\	__pci_dev_resource_attr(, _bar, resource##_bar,	\				pci_mmap_resource_dense) #define pci_dev_resource_sparse_attr(_bar)				\	__pci_dev_resource_attr(_sparse, _bar, resource##_bar##_sparse,	\				pci_mmap_resource_sparse) #define pci_dev_resource_dense_attr(_bar)				\	__pci_dev_resource_attr(_dense, _bar, resource##_bar##_dense,	\				pci_mmap_resource_dense) static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num){	struct pci_bus_region bar;	struct pci_controller *hose = pdev->sysdata;	long dense_offset;	unsigned long sparse_size; 	pcibios_resource_to_bus(pdev->bus, &bar, pci_resource_n(pdev, num)); 	/* All core logic chips have 4G sparse address space, except	   CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM	   definitions in asm/core_xxx.h files). This corresponds	   to 128M or 512M of the bus space. */	dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);	sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000; 	return bar.end < sparse_size;} /* Legacy I/O bus mapping stuff. */ static int __legacy_mmap_fits(struct vm_area_struct *vma,			      unsigned long res_size){	unsigned long nr, start, size; 	nr = vma_pages(vma);	start = vma->vm_pgoff;	size = ((res_size - 1) >> PAGE_SHIFT) + 1; 	return start < size && size - start >= nr;} static inline int has_sparse(struct pci_controller *hose,			     enum pci_mmap_state mmap_type){	unsigned long base; 	base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :					     hose->sparse_io_base; 	return base != 0;} int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,			       enum pci_mmap_state mmap_type){	struct pci_controller *hose = bus->sysdata;	int sparse = has_sparse(hose, mmap_type);	unsigned long res_size; 	res_size = (mmap_type == pci_mmap_mem) ? PCI_LEGACY_MEM_SIZE :						 PCI_LEGACY_IO_SIZE;	if (sparse)		res_size <<= 5; 	if (!__legacy_mmap_fits(vma, res_size))		return -EINVAL; 	return hose_mmap_page_range(hose, vma, mmap_type, sparse);} bool pci_legacy_has_sparse(struct pci_bus *bus, enum pci_mmap_state type){	struct pci_controller *hose = bus->sysdata; 	return has_sparse(hose, type);} /* Legacy I/O bus read/write functions */int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size){	struct pci_controller *hose = bus->sysdata; 	port += hose->io_space->start; 	switch(size) {	case 1:		*((u8 *)val) = inb(port);		return 1;	case 2:		if (port & 1)			return -EINVAL;		*((u16 *)val) = inw(port);		return 2;	case 4:		if (port & 3)			return -EINVAL;		*((u32 *)val) = inl(port);		return 4;	}	return -EINVAL;} int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size){	struct pci_controller *hose = bus->sysdata; 	port += hose->io_space->start; 	switch(size) {	case 1:		outb(val, port);		return 1;	case 2:		if (port & 1)			return -EINVAL;		outw(val, port);		return 2;	case 4:		if (port & 3)			return -EINVAL;		outl(val, port);		return 4;	}	return -EINVAL;} pci_dev_resource_attr(0);pci_dev_resource_attr(1);pci_dev_resource_attr(2);pci_dev_resource_attr(3);pci_dev_resource_attr(4);pci_dev_resource_attr(5); pci_dev_resource_sparse_attr(0);pci_dev_resource_sparse_attr(1);pci_dev_resource_sparse_attr(2);pci_dev_resource_sparse_attr(3);pci_dev_resource_sparse_attr(4);pci_dev_resource_sparse_attr(5); pci_dev_resource_dense_attr(0);pci_dev_resource_dense_attr(1);pci_dev_resource_dense_attr(2);pci_dev_resource_dense_attr(3);pci_dev_resource_dense_attr(4);pci_dev_resource_dense_attr(5); static inline enum pci_mmap_state pci_bar_mmap_type(struct pci_dev *pdev,						    int bar){	return pci_resource_is_mem(pdev, bar) ? pci_mmap_mem : pci_mmap_io;} static inline umode_t __pci_resource_attr_is_visible(struct kobject *kobj,						     const struct bin_attribute *a,						     int bar){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); 	if (!pci_resource_len(pdev, bar))		return 0; 	return a->attr.mode;} static umode_t pci_dev_resource_is_visible(struct kobject *kobj,					   const struct bin_attribute *a,					   int bar){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));	struct pci_controller *hose = pdev->sysdata; 	if (has_sparse(hose, pci_bar_mmap_type(pdev, bar)))		return 0; 	return __pci_resource_attr_is_visible(kobj, a, bar);} static umode_t pci_dev_resource_sparse_is_visible(struct kobject *kobj,						  const struct bin_attribute *a,						  int bar){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));	struct pci_controller *hose = pdev->sysdata;	enum pci_mmap_state type = pci_bar_mmap_type(pdev, bar); 	if (!has_sparse(hose, type))		return 0; 	if (type == pci_mmap_mem && !sparse_mem_mmap_fits(pdev, bar))		return 0; 	return __pci_resource_attr_is_visible(kobj, a, bar);} static umode_t pci_dev_resource_dense_is_visible(struct kobject *kobj,						 const struct bin_attribute *a,						 int bar){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));	struct pci_controller *hose = pdev->sysdata;	enum pci_mmap_state type = pci_bar_mmap_type(pdev, bar);	unsigned long dense_base; 	if (!has_sparse(hose, type))		return 0; 	if (type == pci_mmap_mem && !sparse_mem_mmap_fits(pdev, bar))		return __pci_resource_attr_is_visible(kobj, a, bar); 	dense_base = (type == pci_mmap_mem) ? hose->dense_mem_base :					      hose->dense_io_base;	if (!dense_base)		return 0; 	return __pci_resource_attr_is_visible(kobj, a, bar);} static inline size_t __pci_dev_resource_bin_size(struct kobject *kobj,						 int bar, bool sparse){	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));	size_t size = pci_resource_len(pdev, bar); 	return sparse ? size << 5 : size;} static size_t pci_dev_resource_bin_size(struct kobject *kobj,					const struct bin_attribute *a,					int bar){	return __pci_dev_resource_bin_size(kobj, bar, false);} static size_t pci_dev_resource_sparse_bin_size(struct kobject *kobj,					       const struct bin_attribute *a,					       int bar){	return __pci_dev_resource_bin_size(kobj, bar, true);} static const struct bin_attribute *const pci_dev_resource_attrs[] = {	&pci_dev_resource0_attr,	&pci_dev_resource1_attr,	&pci_dev_resource2_attr,	&pci_dev_resource3_attr,	&pci_dev_resource4_attr,	&pci_dev_resource5_attr,	NULL,}; static const struct bin_attribute *const pci_dev_resource_sparse_attrs[] = {	&pci_dev_resource0_sparse_attr,	&pci_dev_resource1_sparse_attr,	&pci_dev_resource2_sparse_attr,	&pci_dev_resource3_sparse_attr,	&pci_dev_resource4_sparse_attr,	&pci_dev_resource5_sparse_attr,	NULL,}; static const struct bin_attribute *const pci_dev_resource_dense_attrs[] = {	&pci_dev_resource0_dense_attr,	&pci_dev_resource1_dense_attr,	&pci_dev_resource2_dense_attr,	&pci_dev_resource3_dense_attr,	&pci_dev_resource4_dense_attr,	&pci_dev_resource5_dense_attr,	NULL,}; const struct attribute_group pci_dev_resource_attr_group = {	.bin_attrs = pci_dev_resource_attrs,	.is_bin_visible = pci_dev_resource_is_visible,	.bin_size = pci_dev_resource_bin_size,}; const struct attribute_group pci_dev_resource_sparse_attr_group = {	.bin_attrs = pci_dev_resource_sparse_attrs,	.is_bin_visible = pci_dev_resource_sparse_is_visible,	.bin_size = pci_dev_resource_sparse_bin_size,}; const struct attribute_group pci_dev_resource_dense_attr_group = {	.bin_attrs = pci_dev_resource_dense_attrs,	.is_bin_visible = pci_dev_resource_dense_is_visible,	.bin_size = pci_dev_resource_bin_size,};