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-rw-r--r--arch/i386/pci/Makefile2
-rw-r--r--arch/i386/pci/mmconfig-shared.c86
-rw-r--r--arch/i386/pci/mmconfig.c74
-rw-r--r--arch/i386/pci/pci.h6
4 files changed, 97 insertions, 71 deletions
diff --git a/arch/i386/pci/Makefile b/arch/i386/pci/Makefile
index 1594d2f55c8f..44650e03308b 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 000000000000..998e04f6d68f
--- /dev/null
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -0,0 +1,86 @@
+/*
+ * 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 PCI_MMCFG_MAX_CHECK_BUS 16
+
+DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_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 < PCI_MMCFG_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)
+{
+ if ((pci_probe & PCI_PROBE_MMCONF) == 0)
+ return;
+
+ acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
+
+ if ((pci_mmcfg_config_num == 0) ||
+ (pci_mmcfg_config == NULL) ||
+ (pci_mmcfg_config[0].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].address,
+ pci_mmcfg_config[0].address + MMCONFIG_APER_MIN,
+ E820_RESERVED)) {
+ printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not E820-reserved\n",
+ pci_mmcfg_config[0].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 5700220dcf5f..97dcaaa0de0f 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -15,21 +15,13 @@
#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
-
#define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG))
/* The base address of the last MMCONFIG device accessed */
static u32 mmcfg_last_accessed_device;
static int mmcfg_last_accessed_cpu;
-static DECLARE_BITMAP(fallback_slots, MAX_CHECK_BUS*32);
-
/*
* Functions for accessing PCI configuration space with MMCONFIG accesses
*/
@@ -38,8 +30,8 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
int cfg_num = -1;
struct acpi_mcfg_allocation *cfg;
- if (seg == 0 && bus < MAX_CHECK_BUS &&
- test_bit(PCI_SLOT(devfn) + 32*bus, fallback_slots))
+ if (seg == 0 && bus < PCI_MMCFG_MAX_CHECK_BUS &&
+ test_bit(PCI_SLOT(devfn) + 32*bus, pci_mmcfg_fallback_slots))
return 0;
while (1) {
@@ -158,67 +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_SIG_MCFG, acpi_parse_mcfg);
- if ((pci_mmcfg_config_num == 0) ||
- (pci_mmcfg_config == NULL) ||
- (pci_mmcfg_config[0].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].address,
- pci_mmcfg_config[0].address + MMCONFIG_APER_MIN,
- E820_RESERVED)) {
- printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %lx is not E820-reserved\n",
- (unsigned long)pci_mmcfg_config[0].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/i386/pci/pci.h b/arch/i386/pci/pci.h
index a0a25180b61a..0270c80d99cc 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -94,3 +94,9 @@ extern void pci_pcbios_init(void);
extern void pci_mmcfg_init(int type);
extern void pcibios_sort(void);
+/* pci-mmconfig.c */
+
+#define PCI_MMCFG_MAX_CHECK_BUS 16
+extern DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_MAX_CHECK_BUS);
+
+extern int pci_mmcfg_arch_init(void);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 17:41:38 +0000