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Subject[PATCH 1/5] PCI MMConfig: Share what's shareable.
i386 and x86-64 pci mmconfig code have a lot in common.  So share
what's shareable between the two.

Signed-off-by: Olivier Galibert <galibert@pobox.com>
---
arch/i386/pci/Makefile | 2 +-
arch/i386/pci/mmconfig-shared.c | 88 +++++++++++++++++++++++++++++++++++++++
arch/i386/pci/mmconfig.c | 70 ++-----------------------------
arch/x86_64/pci/Makefile | 3 +-
arch/x86_64/pci/mmconfig.c | 64 +++-------------------------
5 files changed, 102 insertions(+), 125 deletions(-)

diff --git a/arch/i386/pci/Makefile b/arch/i386/pci/Makefile
index 1594d2f..44650e0 100644
--- a/arch/i386/pci/Makefile
+++ b/arch/i386/pci/Makefile
@@ -1,7 +1,7 @@
obj-y := i386.o init.o

obj-$(CONFIG_PCI_BIOS) += pcbios.o
-obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o
+obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o mmconfig-shared.o
obj-$(CONFIG_PCI_DIRECT) += direct.o

pci-y := fixup.o
diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
new file mode 100644
index 0000000..4ca3f5a
--- /dev/null
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -0,0 +1,88 @@
+/*
+ * mmconfig-shared.c - Low-level direct PCI config space access via
+ * MMCONFIG - common code between i386 and x86-64.
+ *
+ * This code does:
+ * - ACPI decoding and validation
+ *
+ * Per-architecture code takes care of the mappings and accesses
+ * themselves.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/bitmap.h>
+#include <asm/e820.h>
+
+#include "pci.h"
+
+/* aperture is up to 256MB but BIOS may reserve less */
+#define MMCONFIG_APER_MIN (2 * 1024*1024)
+#define MMCONFIG_APER_MAX (256 * 1024*1024)
+
+/* Verify the first 16 busses. We assume that systems with more busses
+ get MCFG right. */
+#define MAX_CHECK_BUS 16
+
+DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*MAX_CHECK_BUS);
+
+/* K8 systems have some devices (typically in the builtin northbridge)
+ that are only accessible using type1
+ Normally this can be expressed in the MCFG by not listing them
+ and assigning suitable _SEGs, but this isn't implemented in some BIOS.
+ Instead try to discover all devices on bus 0 that are unreachable using MM
+ and fallback for them. */
+static __init void unreachable_devices(void)
+{
+ int i, k;
+ /* Use the max bus number from ACPI here? */
+ for (k = 0; k < MAX_CHECK_BUS; k++) {
+ for (i = 0; i < 32; i++) {
+ u32 val1, val2;
+
+ pci_conf1_read(0, k, PCI_DEVFN(i,0), 0, 4, &val1);
+ if (val1 == 0xffffffff)
+ continue;
+
+ raw_pci_ops->read(0, k, PCI_DEVFN(i, 0), 0, 4, &val2);
+ if (val1 != val2) {
+ set_bit(i + 32*k, pci_mmcfg_fallback_slots);
+ printk(KERN_NOTICE "PCI: No mmconfig possible"
+ " on device %02x:%02x\n", k, i);
+ }
+ }
+ }
+}
+
+void __init pci_mmcfg_init(int type)
+{
+ extern int pci_mmcfg_arch_init(void);
+
+ if ((pci_probe & PCI_PROBE_MMCONF) == 0)
+ return;
+
+ acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
+
+ if ((pci_mmcfg_config_num == 0) ||
+ (pci_mmcfg_config == NULL) ||
+ (pci_mmcfg_config[0].base_address == 0))
+ return;
+
+ /* Only do this check when type 1 works. If it doesn't work
+ assume we run on a Mac and always use MCFG */
+ if (type == 1 &&
+ !e820_all_mapped(pci_mmcfg_config[0].base_address,
+ pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
+ E820_RESERVED)) {
+ printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
+ pci_mmcfg_config[0].base_address);
+ printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
+ return;
+ }
+
+ if (pci_mmcfg_arch_init()) {
+ unreachable_devices();
+ pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
+ }
+}
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index c6b6d9b..36e1ba0 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -15,10 +15,6 @@
#include <asm/e820.h>
#include "pci.h"

-/* aperture is up to 256MB but BIOS may reserve less */
-#define MMCONFIG_APER_MIN (2 * 1024*1024)
-#define MMCONFIG_APER_MAX (256 * 1024*1024)
-
/* Assume systems with more busses have correct MCFG */
#define MAX_CHECK_BUS 16

@@ -27,7 +23,7 @@
/* The base address of the last MMCONFIG device accessed */
static u32 mmcfg_last_accessed_device;

-static DECLARE_BITMAP(fallback_slots, MAX_CHECK_BUS*32);
+extern DECLARE_BITMAP(pci_mmcfg_fallback_slots, MAX_CHECK_BUS*32);

/*
* Functions for accessing PCI configuration space with MMCONFIG accesses
@@ -38,7 +34,7 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
struct acpi_table_mcfg_config *cfg;

if (seg == 0 && bus < MAX_CHECK_BUS &&
- test_bit(PCI_SLOT(devfn) + 32*bus, fallback_slots))
+ test_bit(PCI_SLOT(devfn) + 32*bus, pci_mmcfg_fallback_slots))
return 0;

while (1) {
@@ -154,67 +150,9 @@ static struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};

-/* K8 systems have some devices (typically in the builtin northbridge)
- that are only accessible using type1
- Normally this can be expressed in the MCFG by not listing them
- and assigning suitable _SEGs, but this isn't implemented in some BIOS.
- Instead try to discover all devices on bus 0 that are unreachable using MM
- and fallback for them. */
-static __init void unreachable_devices(void)
+int __init pci_mmcfg_arch_init(void)
{
- int i, k;
- unsigned long flags;
-
- for (k = 0; k < MAX_CHECK_BUS; k++) {
- for (i = 0; i < 32; i++) {
- u32 val1;
- u32 addr;
-
- pci_conf1_read(0, k, PCI_DEVFN(i, 0), 0, 4, &val1);
- if (val1 == 0xffffffff)
- continue;
-
- /* Locking probably not needed, but safer */
- spin_lock_irqsave(&pci_config_lock, flags);
- addr = get_base_addr(0, k, PCI_DEVFN(i, 0));
- if (addr != 0)
- pci_exp_set_dev_base(addr, k, PCI_DEVFN(i, 0));
- if (addr == 0 ||
- readl((u32 __iomem *)mmcfg_virt_addr) != val1) {
- set_bit(i + 32*k, fallback_slots);
- printk(KERN_NOTICE
- "PCI: No mmconfig possible on %x:%x\n", k, i);
- }
- spin_unlock_irqrestore(&pci_config_lock, flags);
- }
- }
-}
-
-void __init pci_mmcfg_init(int type)
-{
- if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- return;
-
- acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
- if ((pci_mmcfg_config_num == 0) ||
- (pci_mmcfg_config == NULL) ||
- (pci_mmcfg_config[0].base_address == 0))
- return;
-
- /* Only do this check when type 1 works. If it doesn't work
- assume we run on a Mac and always use MCFG */
- if (type == 1 && !e820_all_mapped(pci_mmcfg_config[0].base_address,
- pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
- E820_RESERVED)) {
- printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
- pci_mmcfg_config[0].base_address);
- printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
- return;
- }
-
printk(KERN_INFO "PCI: Using MMCONFIG\n");
raw_pci_ops = &pci_mmcfg;
- pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
-
- unreachable_devices();
+ return 1;
}
diff --git a/arch/x86_64/pci/Makefile b/arch/x86_64/pci/Makefile
index 149aba0..c9eddc8 100644
--- a/arch/x86_64/pci/Makefile
+++ b/arch/x86_64/pci/Makefile
@@ -11,7 +11,7 @@ obj-y += fixup.o init.o
obj-$(CONFIG_ACPI) += acpi.o
obj-y += legacy.o irq.o common.o early.o
# mmconfig has a 64bit special
-obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o
+obj-$(CONFIG_PCI_MMCONFIG) += mmconfig.o direct.o mmconfig-shared.o

obj-$(CONFIG_NUMA) += k8-bus.o

@@ -24,3 +24,4 @@ fixup-y += ../../i386/pci/fixup.o
i386-y += ../../i386/pci/i386.o
init-y += ../../i386/pci/init.o
early-y += ../../i386/pci/early.o
+mmconfig-shared-y += ../../i386/pci/mmconfig-shared.o
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index f8b6b28..b270f20 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -21,7 +21,7 @@
get MCFG right. */
#define MAX_CHECK_BUS 16

-static DECLARE_BITMAP(fallback_slots, 32*MAX_CHECK_BUS);
+extern DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*MAX_CHECK_BUS);

/* Static virtual mapping of the MMCONFIG aperture */
struct mmcfg_virt {
@@ -64,7 +64,7 @@ static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned i
{
char __iomem *addr;
if (seg == 0 && bus < MAX_CHECK_BUS &&
- test_bit(32*bus + PCI_SLOT(devfn), fallback_slots))
+ test_bit(32*bus + PCI_SLOT(devfn), pci_mmcfg_fallback_slots))
return NULL;
addr = get_virt(seg, bus);
if (!addr)
@@ -135,63 +135,15 @@ static struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};

-/* K8 systems have some devices (typically in the builtin northbridge)
- that are only accessible using type1
- Normally this can be expressed in the MCFG by not listing them
- and assigning suitable _SEGs, but this isn't implemented in some BIOS.
- Instead try to discover all devices on bus 0 that are unreachable using MM
- and fallback for them. */
-static __init void unreachable_devices(void)
-{
- int i, k;
- /* Use the max bus number from ACPI here? */
- for (k = 0; k < MAX_CHECK_BUS; k++) {
- for (i = 0; i < 32; i++) {
- u32 val1;
- char __iomem *addr;
-
- pci_conf1_read(0, k, PCI_DEVFN(i,0), 0, 4, &val1);
- if (val1 == 0xffffffff)
- continue;
- addr = pci_dev_base(0, k, PCI_DEVFN(i, 0));
- if (addr == NULL|| readl(addr) != val1) {
- set_bit(i + 32*k, fallback_slots);
- printk(KERN_NOTICE "PCI: No mmconfig possible"
- " on device %02x:%02x\n", k, i);
- }
- }
- }
-}
-
-void __init pci_mmcfg_init(int type)
+int __init pci_mmcfg_arch_init(void)
{
int i;
-
- if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- return;
-
- acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
- if ((pci_mmcfg_config_num == 0) ||
- (pci_mmcfg_config == NULL) ||
- (pci_mmcfg_config[0].base_address == 0))
- return;
-
- /* Only do this check when type 1 works. If it doesn't work
- assume we run on a Mac and always use MCFG */
- if (type == 1 && !e820_all_mapped(pci_mmcfg_config[0].base_address,
- pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
- E820_RESERVED)) {
- printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
- pci_mmcfg_config[0].base_address);
- printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
- return;
- }
-
pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL);
if (pci_mmcfg_virt == NULL) {
printk(KERN_ERR "PCI: Can not allocate memory for mmconfig structures\n");
- return;
+ return 0;
}
+
for (i = 0; i < pci_mmcfg_config_num; ++i) {
pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
pci_mmcfg_virt[i].virt = ioremap_nocache(pci_mmcfg_config[i].base_address,
@@ -200,13 +152,11 @@ void __init pci_mmcfg_init(int type)
printk(KERN_ERR "PCI: Cannot map mmconfig aperture for "
"segment %d\n",
pci_mmcfg_config[i].pci_segment_group_number);
- return;
+ return 0;
}
printk(KERN_INFO "PCI: Using MMCONFIG at %x\n", pci_mmcfg_config[i].base_address);
}

- unreachable_devices();
-
raw_pci_ops = &pci_mmcfg;
- pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
+ return 1;
}
--
1.4.4.1.g278f
-
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