48b1914873
This patch contains the following cleanups: - access.c should #include "pci.h" for getting the prototypes of it's global functions - hotplug/shpchp_pci.c: make the needlessly global function program_fw_provided_values() static Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
154 lines
4.5 KiB
C
154 lines
4.5 KiB
C
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
|
|
#include "pci.h"
|
|
|
|
/*
|
|
* This interrupt-safe spinlock protects all accesses to PCI
|
|
* configuration space.
|
|
*/
|
|
|
|
static DEFINE_SPINLOCK(pci_lock);
|
|
|
|
/*
|
|
* Wrappers for all PCI configuration access functions. They just check
|
|
* alignment, do locking and call the low-level functions pointed to
|
|
* by pci_dev->ops.
|
|
*/
|
|
|
|
#define PCI_byte_BAD 0
|
|
#define PCI_word_BAD (pos & 1)
|
|
#define PCI_dword_BAD (pos & 3)
|
|
|
|
#define PCI_OP_READ(size,type,len) \
|
|
int pci_bus_read_config_##size \
|
|
(struct pci_bus *bus, unsigned int devfn, int pos, type *value) \
|
|
{ \
|
|
int res; \
|
|
unsigned long flags; \
|
|
u32 data = 0; \
|
|
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
|
|
spin_lock_irqsave(&pci_lock, flags); \
|
|
res = bus->ops->read(bus, devfn, pos, len, &data); \
|
|
*value = (type)data; \
|
|
spin_unlock_irqrestore(&pci_lock, flags); \
|
|
return res; \
|
|
}
|
|
|
|
#define PCI_OP_WRITE(size,type,len) \
|
|
int pci_bus_write_config_##size \
|
|
(struct pci_bus *bus, unsigned int devfn, int pos, type value) \
|
|
{ \
|
|
int res; \
|
|
unsigned long flags; \
|
|
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
|
|
spin_lock_irqsave(&pci_lock, flags); \
|
|
res = bus->ops->write(bus, devfn, pos, len, value); \
|
|
spin_unlock_irqrestore(&pci_lock, flags); \
|
|
return res; \
|
|
}
|
|
|
|
PCI_OP_READ(byte, u8, 1)
|
|
PCI_OP_READ(word, u16, 2)
|
|
PCI_OP_READ(dword, u32, 4)
|
|
PCI_OP_WRITE(byte, u8, 1)
|
|
PCI_OP_WRITE(word, u16, 2)
|
|
PCI_OP_WRITE(dword, u32, 4)
|
|
|
|
EXPORT_SYMBOL(pci_bus_read_config_byte);
|
|
EXPORT_SYMBOL(pci_bus_read_config_word);
|
|
EXPORT_SYMBOL(pci_bus_read_config_dword);
|
|
EXPORT_SYMBOL(pci_bus_write_config_byte);
|
|
EXPORT_SYMBOL(pci_bus_write_config_word);
|
|
EXPORT_SYMBOL(pci_bus_write_config_dword);
|
|
|
|
static u32 pci_user_cached_config(struct pci_dev *dev, int pos)
|
|
{
|
|
u32 data;
|
|
|
|
data = dev->saved_config_space[pos/sizeof(dev->saved_config_space[0])];
|
|
data >>= (pos % sizeof(dev->saved_config_space[0])) * 8;
|
|
return data;
|
|
}
|
|
|
|
#define PCI_USER_READ_CONFIG(size,type) \
|
|
int pci_user_read_config_##size \
|
|
(struct pci_dev *dev, int pos, type *val) \
|
|
{ \
|
|
unsigned long flags; \
|
|
int ret = 0; \
|
|
u32 data = -1; \
|
|
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
|
|
spin_lock_irqsave(&pci_lock, flags); \
|
|
if (likely(!dev->block_ucfg_access)) \
|
|
ret = dev->bus->ops->read(dev->bus, dev->devfn, \
|
|
pos, sizeof(type), &data); \
|
|
else if (pos < sizeof(dev->saved_config_space)) \
|
|
data = pci_user_cached_config(dev, pos); \
|
|
spin_unlock_irqrestore(&pci_lock, flags); \
|
|
*val = (type)data; \
|
|
return ret; \
|
|
}
|
|
|
|
#define PCI_USER_WRITE_CONFIG(size,type) \
|
|
int pci_user_write_config_##size \
|
|
(struct pci_dev *dev, int pos, type val) \
|
|
{ \
|
|
unsigned long flags; \
|
|
int ret = -EIO; \
|
|
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
|
|
spin_lock_irqsave(&pci_lock, flags); \
|
|
if (likely(!dev->block_ucfg_access)) \
|
|
ret = dev->bus->ops->write(dev->bus, dev->devfn, \
|
|
pos, sizeof(type), val); \
|
|
spin_unlock_irqrestore(&pci_lock, flags); \
|
|
return ret; \
|
|
}
|
|
|
|
PCI_USER_READ_CONFIG(byte, u8)
|
|
PCI_USER_READ_CONFIG(word, u16)
|
|
PCI_USER_READ_CONFIG(dword, u32)
|
|
PCI_USER_WRITE_CONFIG(byte, u8)
|
|
PCI_USER_WRITE_CONFIG(word, u16)
|
|
PCI_USER_WRITE_CONFIG(dword, u32)
|
|
|
|
/**
|
|
* pci_block_user_cfg_access - Block userspace PCI config reads/writes
|
|
* @dev: pci device struct
|
|
*
|
|
* This function blocks any userspace PCI config accesses from occurring.
|
|
* When blocked, any writes will be bit bucketed and reads will return the
|
|
* data saved using pci_save_state for the first 64 bytes of config
|
|
* space and return 0xff for all other config reads.
|
|
**/
|
|
void pci_block_user_cfg_access(struct pci_dev *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
pci_save_state(dev);
|
|
|
|
/* spinlock to synchronize with anyone reading config space now */
|
|
spin_lock_irqsave(&pci_lock, flags);
|
|
dev->block_ucfg_access = 1;
|
|
spin_unlock_irqrestore(&pci_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_block_user_cfg_access);
|
|
|
|
/**
|
|
* pci_unblock_user_cfg_access - Unblock userspace PCI config reads/writes
|
|
* @dev: pci device struct
|
|
*
|
|
* This function allows userspace PCI config accesses to resume.
|
|
**/
|
|
void pci_unblock_user_cfg_access(struct pci_dev *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* spinlock to synchronize with anyone reading saved config space */
|
|
spin_lock_irqsave(&pci_lock, flags);
|
|
dev->block_ucfg_access = 0;
|
|
spin_unlock_irqrestore(&pci_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_unblock_user_cfg_access);
|