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-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/include/asm/pci.h8
-rw-r--r--arch/x86/pci/ce4100.c87
-rw-r--r--arch/x86/pci/common.c4
-rw-r--r--arch/x86/pci/legacy.c18
-rw-r--r--drivers/pci/Kconfig3
-rw-r--r--drivers/pci/access.c16
7 files changed, 77 insertions, 60 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7bdb9022c6e7..dfe1a7ffe6d4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index f513cc231151..473a7295ab10 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -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;
diff --git a/arch/x86/pci/ce4100.c b/arch/x86/pci/ce4100.c
index b914e20b5a00..3353b76dcff0 100644
--- a/arch/x86/pci/ce4100.c
+++ b/arch/x86/pci/ce4100.c
@@ -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[] = {
@@ -265,24 +256,33 @@ 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);
- extract_bytes(value, reg, len);
- return 0;
- }
+ 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) {
+
+ 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))
@@ -291,23 +291,32 @@ 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);
- return 0;
- }
+ 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) {
+
+ 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 &&
@@ -318,8 +327,8 @@ static int ce4100_conf_write(unsigned int seg, unsigned int bus,
}
static const struct pci_raw_ops ce4100_pci_conf = {
- .read = ce4100_conf_read,
- .write = ce4100_conf_write,
+ .read = ce4100_conf_read,
+ .write = ce4100_conf_write,
};
int __init ce4100_pci_init(void)
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 190e718694b1..cfd1a89fd04e 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -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);
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index ea6f3802c17b..1cb01abcb1be 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -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();
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e0cacb7b8563..c32a77fc8b03 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -86,6 +86,9 @@ config PCI_ATS
config PCI_ECAM
bool
+config PCI_LOCKLESS_CONFIG
+ bool
+
config PCI_IOV
bool "PCI IOV support"
depends on PCI
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index c80e37a69305..913d6722ece9 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -25,6 +25,14 @@ DEFINE_RAW_SPINLOCK(pci_lock);
#define PCI_word_BAD (pos & 1)
#define PCI_dword_BAD (pos & 3)
+#ifdef CONFIG_PCI_LOCKLESS_CONFIG
+# define pci_lock_config(f) do { (void)(f); } while (0)
+# define pci_unlock_config(f) do { (void)(f); } while (0)
+#else
+# define pci_lock_config(f) raw_spin_lock_irqsave(&pci_lock, f)
+# define pci_unlock_config(f) raw_spin_unlock_irqrestore(&pci_lock, f)
+#endif
+
#define PCI_OP_READ(size, type, len) \
int pci_bus_read_config_##size \
(struct pci_bus *bus, unsigned int devfn, int pos, type *value) \
@@ -33,10 +41,10 @@ int pci_bus_read_config_##size \
unsigned long flags; \
u32 data = 0; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- raw_spin_lock_irqsave(&pci_lock, flags); \
+ pci_lock_config(flags); \
res = bus->ops->read(bus, devfn, pos, len, &data); \
*value = (type)data; \
- raw_spin_unlock_irqrestore(&pci_lock, flags); \
+ pci_unlock_config(flags); \
return res; \
}
@@ -47,9 +55,9 @@ int pci_bus_write_config_##size \
int res; \
unsigned long flags; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- raw_spin_lock_irqsave(&pci_lock, flags); \
+ pci_lock_config(flags); \
res = bus->ops->write(bus, devfn, pos, len, value); \
- raw_spin_unlock_irqrestore(&pci_lock, flags); \
+ pci_unlock_config(flags); \
return res; \
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-05 16:08:25 +0000