Commit 8c073517 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 PCI updates from Thomas Gleixner:
 "This update provides the seperation of x86 PCI accessors from the
  global PCI lock in the generic PCI config space accessors.

  The reasons for this are:

   - x86 has it's own PCI config lock for various reasons, so the
     accessors have to lock two locks nested.

   - The ECAM (mmconfig) access to the extended configuration space does
     not require locking. The existing generic locking causes a massive
     lock contention when accessing the extended config space of the
     Uncore facility for performance monitoring.

  The commit which switched the access to the primary config space over
  to ECAM mode has been removed from the branch, so the primary config
  space is still accessed with type1 accessors properly serialized by
  the x86 internal locking.

  Bjorn agreed on merging this through the x86 tree"

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/PCI: Select CONFIG_PCI_LOCKLESS_CONFIG
  PCI: Provide Kconfig option for lockless config space accessors
  x86/PCI/ce4100: Properly lock accessor functions
  x86/PCI: Abort if legacy init fails
  x86/PCI: Remove duplicate defines
parents 03ffbcdd df65c1bc

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -168,6 +168,7 @@ config X86 
	select HAVE_UNSTABLE_SCHED_CLOCK

	select HAVE_USER_RETURN_NOTIFIER

	select IRQ_FORCED_THREADING

	select PCI_LOCKLESS_CONFIG

	select PERF_EVENTS

	select RTC_LIB

	select RTC_MC146818_LIB

arch/x86/include/asm/pci.h

+1 −7
Original line number Diff line number Diff line
@@ -77,14 +77,8 @@ static inline bool is_vmd(struct pci_bus *bus) 


extern unsigned int pcibios_assign_all_busses(void);

extern int pci_legacy_init(void);

# ifdef CONFIG_ACPI

#  define x86_default_pci_init pci_acpi_init

# else

#  define x86_default_pci_init pci_legacy_init

# endif

#else

# define pcibios_assign_all_busses()	0

# define x86_default_pci_init		NULL

static inline int pcibios_assign_all_busses(void) { return 0; }

#endif



extern unsigned long pci_mem_start;

arch/x86/pci/ce4100.c

+48 −39
Original line number Diff line number Diff line
@@ -65,6 +65,9 @@ struct sim_reg_op { 
{ PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\

	{0, SIZE_TO_MASK(size)} },



/*

 * All read/write functions are called with pci_config_lock held.

 */

static void reg_init(struct sim_dev_reg *reg)

{

	pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4,
@@ -73,21 +76,13 @@ static void reg_init(struct sim_dev_reg *reg) 


static void reg_read(struct sim_dev_reg *reg, u32 *value)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&pci_config_lock, flags);

	*value = reg->sim_reg.value;

	raw_spin_unlock_irqrestore(&pci_config_lock, flags);

}



static void reg_write(struct sim_dev_reg *reg, u32 value)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&pci_config_lock, flags);

	reg->sim_reg.value = (value & reg->sim_reg.mask) |

		(reg->sim_reg.value & ~reg->sim_reg.mask);

	raw_spin_unlock_irqrestore(&pci_config_lock, flags);

}



static void sata_reg_init(struct sim_dev_reg *reg)
@@ -117,12 +112,8 @@ static void sata_revid_read(struct sim_dev_reg *reg, u32 *value) 


static void reg_noirq_read(struct sim_dev_reg *reg, u32 *value)

{

	unsigned long flags;



	raw_spin_lock_irqsave(&pci_config_lock, flags);

	/* force interrupt pin value to 0 */

	*value = reg->sim_reg.value & 0xfff00ff;

	raw_spin_unlock_irqrestore(&pci_config_lock, flags);

}



static struct sim_dev_reg bus1_fixups[] = {
@@ -265,25 +256,34 @@ int bridge_read(unsigned int devfn, int reg, int len, u32 *value) 
	return retval;

}



static int ce4100_conf_read(unsigned int seg, unsigned int bus,

			    unsigned int devfn, int reg, int len, u32 *value)

static int ce4100_bus1_read(unsigned int devfn, int reg, int len, u32 *value)

{

	unsigned long flags;

	int i;



	WARN_ON(seg);

	if (bus == 1) {

	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {

		if (bus1_fixups[i].dev_func == devfn &&

		    bus1_fixups[i].reg == (reg & ~3) &&

		    bus1_fixups[i].read) {

				bus1_fixups[i].read(&(bus1_fixups[i]),

						    value);



			raw_spin_lock_irqsave(&pci_config_lock, flags);

			bus1_fixups[i].read(&(bus1_fixups[i]), value);

			raw_spin_unlock_irqrestore(&pci_config_lock, flags);

			extract_bytes(value, reg, len);

			return 0;

		}

	}

	return -1;

}



static int ce4100_conf_read(unsigned int seg, unsigned int bus,

			    unsigned int devfn, int reg, int len, u32 *value)

{

	WARN_ON(seg);



	if (bus == 1 && !ce4100_bus1_read(devfn, reg, len, value))

		return 0;



	if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) &&

	    !bridge_read(devfn, reg, len, value))

		return 0;
@@ -291,24 +291,33 @@ static int ce4100_conf_read(unsigned int seg, unsigned int bus, 
	return pci_direct_conf1.read(seg, bus, devfn, reg, len, value);

}



static int ce4100_conf_write(unsigned int seg, unsigned int bus,

			     unsigned int devfn, int reg, int len, u32 value)

static int ce4100_bus1_write(unsigned int devfn, int reg, int len, u32 value)

{

	unsigned long flags;

	int i;



	WARN_ON(seg);

	if (bus == 1) {

	for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) {

		if (bus1_fixups[i].dev_func == devfn &&

		    bus1_fixups[i].reg == (reg & ~3) &&

		    bus1_fixups[i].write) {

				bus1_fixups[i].write(&(bus1_fixups[i]),

						     value);



			raw_spin_lock_irqsave(&pci_config_lock, flags);

			bus1_fixups[i].write(&(bus1_fixups[i]), value);

			raw_spin_unlock_irqrestore(&pci_config_lock, flags);

			return 0;

		}

	}

	return -1;

}



static int ce4100_conf_write(unsigned int seg, unsigned int bus,

			     unsigned int devfn, int reg, int len, u32 value)

{

	WARN_ON(seg);



	if (bus == 1 && !ce4100_bus1_write(devfn, reg, len, value))

		return 0;



	/* Discard writes to A/V bridge BAR. */

	if (bus == 0 && PCI_DEVFN(1, 0) == devfn &&

	    ((reg & ~3) == PCI_BASE_ADDRESS_0))

arch/x86/pci/common.c

+2 −2
Original line number Diff line number Diff line
@@ -75,8 +75,8 @@ struct pci_ops pci_root_ops = { 
};



/*

 * This interrupt-safe spinlock protects all accesses to PCI

 * configuration space.

 * This interrupt-safe spinlock protects all accesses to PCI configuration

 * space, except for the mmconfig (ECAM) based operations.

 */

DEFINE_RAW_SPINLOCK(pci_config_lock);

arch/x86/pci/legacy.c

+10 −8
Original line number Diff line number Diff line
@@ -24,12 +24,10 @@ static void pcibios_fixup_peer_bridges(void) 


int __init pci_legacy_init(void)

{

	if (!raw_pci_ops) {

		printk("PCI: System does not support PCI\n");

		return 0;

	}

	if (!raw_pci_ops)

		return 1;



	printk("PCI: Probing PCI hardware\n");

	pr_info("PCI: Probing PCI hardware\n");

	pcibios_scan_root(0);

	return 0;

}
@@ -46,7 +44,7 @@ void pcibios_scan_specific_bus(int busn) 
		if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&

		    l != 0x0000 && l != 0xffff) {

			DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);

			printk(KERN_INFO "PCI: Discovered peer bus %02x\n", busn);

			pr_info("PCI: Discovered peer bus %02x\n", busn);

			pcibios_scan_root(busn);

			return;

		}
@@ -60,8 +58,12 @@ static int __init pci_subsys_init(void) 
	 * The init function returns an non zero value when

	 * pci_legacy_init should be invoked.

	 */

	if (x86_init.pci.init())

		pci_legacy_init();

	if (x86_init.pci.init()) {

		if (pci_legacy_init()) {

			pr_info("PCI: System does not support PCI\n");

			return -ENODEV;

		}

	}



	pcibios_fixup_peer_bridges();

	x86_init.pci.init_irq();

CRA Git | Maintained and supported by SUSTech CRA and CCSE