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PCI, of: Move PCI I/O space management to PCI core code

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No functional changes in this patch.

PCI I/O space mapping code does not depend on OF; therefore it can be moved
to PCI core code.  This way we will be able to use it, e.g., in ACPI PCI
code.

Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Liviu Dudau <Liviu.Dudau@arm.com>
This commit is contained in:
Tomasz Nowicki 2016-05-11 17:34:51 -05:00 committed by Bjorn Helgaas
parent 1958e7173d
commit c5076cfe76
4 changed files with 121 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

116
drivers/of/address.c
View File

@ -4,6 +4,7 @@
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/sizes.h>
#include <linux/slab.h>
@ -673,121 +674,6 @@ const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
}
EXPORT_SYMBOL(of_get_address);
#ifdef PCI_IOBASE
struct io_range {
struct list_head list;
phys_addr_t start;
resource_size_t size;
};
static LIST_HEAD(io_range_list);
static DEFINE_SPINLOCK(io_range_lock);
#endif
/*
* Record the PCI IO range (expressed as CPU physical address + size).
* Return a negative value if an error has occured, zero otherwise
*/
int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
{
int err = 0;
#ifdef PCI_IOBASE
struct io_range *range;
resource_size_t allocated_size = 0;
/* check if the range hasn't been previously recorded */
spin_lock(&io_range_lock);
list_for_each_entry(range, &io_range_list, list) {
if (addr >= range->start && addr + size <= range->start + size) {
/* range already registered, bail out */
goto end_register;
}
allocated_size += range->size;
}
/* range not registed yet, check for available space */
if (allocated_size + size - 1 > IO_SPACE_LIMIT) {
/* if it's too big check if 64K space can be reserved */
if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {
err = -E2BIG;
goto end_register;
}
size = SZ_64K;
pr_warn("Requested IO range too big, new size set to 64K\n");
}
/* add the range to the list */
range = kzalloc(sizeof(*range), GFP_ATOMIC);
if (!range) {
err = -ENOMEM;
goto end_register;
}
range->start = addr;
range->size = size;
list_add_tail(&range->list, &io_range_list);
end_register:
spin_unlock(&io_range_lock);
#endif
return err;
}
phys_addr_t pci_pio_to_address(unsigned long pio)
{
phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
#ifdef PCI_IOBASE
struct io_range *range;
resource_size_t allocated_size = 0;
if (pio > IO_SPACE_LIMIT)
return address;
spin_lock(&io_range_lock);
list_for_each_entry(range, &io_range_list, list) {
if (pio >= allocated_size && pio < allocated_size + range->size) {
address = range->start + pio - allocated_size;
break;
}
allocated_size += range->size;
}
spin_unlock(&io_range_lock);
#endif
return address;
}
unsigned long __weak pci_address_to_pio(phys_addr_t address)
{
#ifdef PCI_IOBASE
struct io_range *res;
resource_size_t offset = 0;
unsigned long addr = -1;
spin_lock(&io_range_lock);
list_for_each_entry(res, &io_range_list, list) {
if (address >= res->start && address < res->start + res->size) {
addr = address - res->start + offset;
break;
}
offset += res->size;
}
spin_unlock(&io_range_lock);
return addr;
#else
if (address > IO_SPACE_LIMIT)
return (unsigned long)-1;
return (unsigned long) address;
#endif
}
static int __of_address_to_resource(struct device_node *dev,
const __be32 *addrp, u64 size, unsigned int flags,
const char *name, struct resource *r)

115
drivers/pci/pci.c
View File

@ -3021,6 +3021,121 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
}
EXPORT_SYMBOL(pci_request_regions_exclusive);
#ifdef PCI_IOBASE
struct io_range {
struct list_head list;
phys_addr_t start;
resource_size_t size;
};
static LIST_HEAD(io_range_list);
static DEFINE_SPINLOCK(io_range_lock);
#endif
/*
* Record the PCI IO range (expressed as CPU physical address + size).
* Return a negative value if an error has occured, zero otherwise
*/
int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
{
int err = 0;
#ifdef PCI_IOBASE
struct io_range *range;
resource_size_t allocated_size = 0;
/* check if the range hasn't been previously recorded */
spin_lock(&io_range_lock);
list_for_each_entry(range, &io_range_list, list) {
if (addr >= range->start && addr + size <= range->start + size) {
/* range already registered, bail out */
goto end_register;
}
allocated_size += range->size;
}
/* range not registed yet, check for available space */
if (allocated_size + size - 1 > IO_SPACE_LIMIT) {
/* if it's too big check if 64K space can be reserved */
if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {
err = -E2BIG;
goto end_register;
}
size = SZ_64K;
pr_warn("Requested IO range too big, new size set to 64K\n");
}
/* add the range to the list */
range = kzalloc(sizeof(*range), GFP_ATOMIC);
if (!range) {
err = -ENOMEM;
goto end_register;
}
range->start = addr;
range->size = size;
list_add_tail(&range->list, &io_range_list);
end_register:
spin_unlock(&io_range_lock);
#endif
return err;
}
phys_addr_t pci_pio_to_address(unsigned long pio)
{
phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
#ifdef PCI_IOBASE
struct io_range *range;
resource_size_t allocated_size = 0;
if (pio > IO_SPACE_LIMIT)
return address;
spin_lock(&io_range_lock);
list_for_each_entry(range, &io_range_list, list) {
if (pio >= allocated_size && pio < allocated_size + range->size) {
address = range->start + pio - allocated_size;
break;
}
allocated_size += range->size;
}
spin_unlock(&io_range_lock);
#endif
return address;
}
unsigned long __weak pci_address_to_pio(phys_addr_t address)
{
#ifdef PCI_IOBASE
struct io_range *res;
resource_size_t offset = 0;
unsigned long addr = -1;
spin_lock(&io_range_lock);
list_for_each_entry(res, &io_range_list, list) {
if (address >= res->start && address < res->start + res->size) {
addr = address - res->start + offset;
break;
}
offset += res->size;
}
spin_unlock(&io_range_lock);
return addr;
#else
if (address > IO_SPACE_LIMIT)
return (unsigned long)-1;
return (unsigned long) address;
#endif
}
/**
* pci_remap_iospace - Remap the memory mapped I/O space
* @res: Resource describing the I/O space

9
include/linux/of_address.h
View File

@ -47,10 +47,6 @@ void __iomem *of_io_request_and_map(struct device_node *device,
extern const __be32 *of_get_address(struct device_node *dev, int index,
u64 *size, unsigned int *flags);
extern int pci_register_io_range(phys_addr_t addr, resource_size_t size);
extern unsigned long pci_address_to_pio(phys_addr_t addr);
extern phys_addr_t pci_pio_to_address(unsigned long pio);
extern int of_pci_range_parser_init(struct of_pci_range_parser *parser,
struct device_node *node);
extern struct of_pci_range *of_pci_range_parser_one(
@ -86,11 +82,6 @@ static inline const __be32 *of_get_address(struct device_node *dev, int index,
return NULL;
}
static inline phys_addr_t pci_pio_to_address(unsigned long pio)
{
return 0;
}
static inline int of_pci_range_parser_init(struct of_pci_range_parser *parser,
struct device_node *node)
{

5
include/linux/pci.h
View File

@ -1164,6 +1164,9 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
void *alignf_data);
int pci_register_io_range(phys_addr_t addr, resource_size_t size);
unsigned long pci_address_to_pio(phys_addr_t addr);
phys_addr_t pci_pio_to_address(unsigned long pio);
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
@ -1480,6 +1483,8 @@ static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
{ return -EIO; }
static inline void pci_release_regions(struct pci_dev *dev) { }
static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
static inline void pci_block_cfg_access(struct pci_dev *dev) { }
static inline int pci_block_cfg_access_in_atomic(struct pci_dev *dev)
{ return 0; }