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Date: Wed, 7 May 2008 00:48:46 -0700
From: Yinghai Lu <yhlu.kernel.send@...il.com>
To: Ingo Molnar <mingo@...e.hu>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: update mptable v2
make mptable to be consistent to acpi routing, so we could
1. kexec kernel with acpi=off
2. workaround BIOS that acpi routing is working, but mptable is not right.
so can use kernel/kexec to start other os that doesn't have good acpi support
command line: update_mptable
v2: add alloc_mptable for mptable that can not be changed.
new command line: alloc_mptable
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
Index: linux-2.6/arch/x86/kernel/e820_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820_64.c
+++ linux-2.6/arch/x86/kernel/e820_64.c
@@ -301,6 +301,35 @@ unsigned long __init find_e820_area_size
return -1UL;
}
+
+/*
+ * pre allocated 4k and reserved it in e820
+ */
+unsigned long __init early_reserve_e820(unsigned long sizet,
+ unsigned long align)
+{
+ unsigned long start = 0, size = 0;
+ unsigned long addr;
+
+#ifdef CONFIG_X86_TRAMPOLINE
+ start = TRAMPOLINE_BASE;
+#endif
+ while (size < sizet)
+ start = find_e820_area_size(start, &size, align);
+
+ if (size < sizet)
+ return 0;
+
+ addr = start + size - sizet;
+
+ update_memory_range(addr, sizet, E820_RAM, E820_RESERVED);
+
+ printk(KERN_INFO "update e820 for early_reserve_e820\n");
+ update_e820();
+
+ return addr;
+}
+
/*
* Find the highest page frame number we have available
*/
Index: linux-2.6/arch/x86/kernel/mpparse.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/mpparse.c
+++ linux-2.6/arch/x86/kernel/mpparse.c
@@ -25,6 +25,7 @@
#include <asm/proto.h>
#include <asm/acpi.h>
#include <asm/bios_ebda.h>
+#include <asm/e820.h>
#include <mach_apic.h>
#ifdef CONFIG_X86_32
@@ -180,14 +181,26 @@ static void __init MP_ioapic_info(struct
nr_ioapics++;
}
-static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
+static void __init print_MP_intsrc_info(struct mpc_config_intsrc *m)
{
- mp_irqs[mp_irq_entries] = *m;
printk(KERN_INFO "Int: type %d, pol %d, trig %d, bus %02x,"
" IRQ %02x, APIC ID %x, APIC INT %02x\n",
m->mpc_irqtype, m->mpc_irqflag & 3,
(m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
+}
+
+static void __init MP_intsrc_info(struct mpc_config_intsrc *m)
+{
+ int i;
+
+ print_MP_intsrc_info(m);
+
+ for (i = 0; i < mp_irq_entries; i++)
+ if (!memcmp(m, &mp_irqs[i], sizeof(*m)))
+ return;
+
+ mp_irqs[mp_irq_entries] = *m;
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!!\n");
}
@@ -281,12 +294,9 @@ static inline void mps_oem_check(struct
* Read/parse the MPC
*/
-static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
+static int __init smp_check_mpc(struct mp_config_table *mpc, char *oem,
+ char *str)
{
- char str[16];
- char oem[10];
- int count = sizeof(*mpc);
- unsigned char *mpt = ((unsigned char *)mpc) + count;
if (memcmp(mpc->mpc_signature, MPC_SIGNATURE, 4)) {
printk(KERN_ERR "MPTABLE: bad signature [%c%c%c%c]!\n",
@@ -314,13 +324,28 @@ static int __init smp_read_mpc(struct mp
memcpy(str, mpc->mpc_productid, 12);
str[12] = 0;
-#ifdef CONFIG_X86_32
- mps_oem_check(mpc, oem, str);
-#endif
printk(KERN_INFO "MPTABLE: Product ID: %s\n", str);
printk(KERN_INFO "MPTABLE: APIC at: 0x%X\n", mpc->mpc_lapic);
+ return 1;
+}
+
+static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
+{
+ char str[16];
+ char oem[10];
+
+ int count = sizeof(*mpc);
+ unsigned char *mpt = ((unsigned char *)mpc) + count;
+
+ if (!smp_check_mpc(mpc, oem, str))
+ return 0;
+
+#ifdef CONFIG_X86_32
+ mps_oem_check(mpc, oem, str);
+#endif
+
/* save the local APIC address, it might be non-default */
if (!acpi_lapic)
mp_lapic_addr = mpc->mpc_lapic;
@@ -1082,5 +1107,316 @@ int mp_register_gsi(u32 gsi, int trigger
return gsi;
}
+int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
+ u32 gsi, int triggering, int polarity)
+{
+ struct mpc_config_intsrc intsrc;
+ int ioapic;
+
+ /* print the entry should happen on mptable identically */
+ intsrc.mpc_type = MP_INTSRC;
+ intsrc.mpc_irqtype = mp_INT;
+ intsrc.mpc_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
+ (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
+ intsrc.mpc_srcbus = number;
+ intsrc.mpc_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
+ ioapic = mp_find_ioapic(gsi);
+ intsrc.mpc_dstapic = mp_ioapic_routing[ioapic].apic_id;
+ intsrc.mpc_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
+
+ MP_intsrc_info(&intsrc);
+
+ return 0;
+}
#endif /* CONFIG_X86_IO_APIC */
#endif /* CONFIG_ACPI */
+
+static u8 __initdata irq_used[MAX_IRQ_SOURCES];
+
+static int __init get_MP_intsrc_index(struct mpc_config_intsrc *m)
+{
+ int i;
+
+ if (m->mpc_irqtype != mp_INT)
+ return 0;
+
+ if (m->mpc_irqflag != 0x0f)
+ return 0;
+
+ /* not legacy */
+
+ for (i = 0; i < mp_irq_entries; i++) {
+ if (mp_irqs[i].mpc_irqtype != mp_INT)
+ continue;
+
+ if (mp_irqs[i].mpc_irqflag != 0x0f)
+ continue;
+
+ if (mp_irqs[i].mpc_srcbus != m->mpc_srcbus)
+ continue;
+ if (mp_irqs[i].mpc_srcbusirq != m->mpc_srcbusirq)
+ continue;
+ if (irq_used[i]) {
+ /* already claimed */
+ return -2;
+ }
+ irq_used[i] = 1;
+ return i;
+ }
+
+ /* not found */
+ return -1;
+}
+
+#define SPARE_SLOT_NUM 20
+
+static struct mpc_config_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
+
+static int __init replace_intsrc_all(struct mp_config_table *mpc,
+ unsigned long mpc_new_phys,
+ unsigned long mpc_new_length)
+{
+ int i;
+ int nr_m_spare = 0;
+
+ int count = sizeof(*mpc);
+ unsigned char *mpt = ((unsigned char *)mpc) + count;
+
+ printk(KERN_INFO "mpc_length %x\n", mpc->mpc_length);
+ while (count < mpc->mpc_length) {
+ switch (*mpt) {
+ case MP_PROCESSOR:
+ {
+ struct mpc_config_processor *m =
+ (struct mpc_config_processor *)mpt;
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_BUS:
+ {
+ struct mpc_config_bus *m =
+ (struct mpc_config_bus *)mpt;
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ case MP_IOAPIC:
+ {
+ mpt += sizeof(struct mpc_config_ioapic);
+ count += sizeof(struct mpc_config_ioapic);
+ break;
+ }
+ case MP_INTSRC:
+ {
+#ifdef CONFIG_X86_IO_APIC
+ struct mpc_config_intsrc *m =
+ (struct mpc_config_intsrc *)mpt;
+
+ printk(KERN_CONT "OLD ");
+ print_MP_intsrc_info(m);
+ i = get_MP_intsrc_index(m);
+ if (i > 0) {
+ memcpy(m, &mp_irqs[i], sizeof(*m));
+ printk(KERN_CONT "NEW ");
+ print_MP_intsrc_info(&mp_irqs[i]);
+ } else if (!i) {
+ /* legacy, do nothing */
+ } else if (nr_m_spare < SPARE_SLOT_NUM) {
+ /*
+ * not found (-1), or duplicated (-2)
+ * are invalid entries,
+ * we need to use the slot later
+ */
+ m_spare[nr_m_spare] = m;
+ nr_m_spare++;
+ }
+#endif
+ mpt += sizeof(struct mpc_config_intsrc);
+ count += sizeof(struct mpc_config_intsrc);
+ break;
+ }
+ case MP_LINTSRC:
+ {
+ struct mpc_config_lintsrc *m =
+ (struct mpc_config_lintsrc *)mpt;
+ mpt += sizeof(*m);
+ count += sizeof(*m);
+ break;
+ }
+ default:
+ /* wrong mptable */
+ printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
+ printk(KERN_ERR "type %x\n", *mpt);
+ print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
+ 1, mpc, mpc->mpc_length, 1);
+ goto out;
+ }
+ }
+
+#ifdef CONFIG_X86_IO_APIC
+ for (i = 0; i < mp_irq_entries; i++) {
+ if (irq_used[i])
+ continue;
+
+ if (mp_irqs[i].mpc_irqtype != mp_INT)
+ continue;
+
+ if (mp_irqs[i].mpc_irqflag != 0x0f)
+ continue;
+
+ if (nr_m_spare > 0) {
+ printk(KERN_INFO "*NEW* found ");
+ nr_m_spare--;
+ memcpy(m_spare[nr_m_spare], &mp_irqs[i],
+ sizeof(mp_irqs[i]));
+ m_spare[nr_m_spare] = NULL;
+ } else {
+ struct mpc_config_intsrc *m =
+ (struct mpc_config_intsrc *)mpt;
+ count += sizeof(struct mpc_config_intsrc);
+ if (!mpc_new_phys) {
+ printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
+ } else {
+ if (count <= mpc_new_length)
+ printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
+ else {
+ printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
+ goto out;
+ }
+ }
+ memcpy(m, &mp_irqs[i], sizeof(mp_irqs[i]));
+ mpc->mpc_length = count;
+ mpt += sizeof(struct mpc_config_intsrc);
+ }
+ print_MP_intsrc_info(&mp_irqs[i]);
+ }
+#endif
+out:
+ /* update checksum */
+ mpc->mpc_checksum = 0;
+ mpc->mpc_checksum -= mpf_checksum((unsigned char *)mpc,
+ mpc->mpc_length);
+
+ return 0;
+}
+
+int __initdata enable_update_mptable;
+
+static int __init update_mptable_setup(char *str)
+{
+ enable_update_mptable = 1;
+ return 0;
+}
+early_param("update_mptable", update_mptable_setup);
+
+static unsigned long __initdata mpc_new_phys;
+static unsigned long mpc_new_length __initdata = 4096;
+
+#ifdef CONFIG_X86_64
+/* alloc_mptable or alloc_mptable=4k */
+static int __initdata alloc_mptable;
+static int __init parse_alloc_mptable_opt(char *p)
+{
+ enable_update_mptable = 1;
+ alloc_mptable = 1;
+ if (!p)
+ return 0;
+ mpc_new_length = memparse(p, &p);
+ return 0;
+}
+early_param("alloc_mptable", parse_alloc_mptable_opt);
+
+void __init early_reserve_e820_mpc_new(void)
+{
+ if (enable_update_mptable && alloc_mptable)
+ mpc_new_phys = early_reserve_e820(mpc_new_length, 4);
+}
+#else
+void __init early_reserve_e820_mpc_new(void)
+{
+}
+#endif
+
+static int __init update_mp_table(void)
+{
+ char str[16];
+ char oem[10];
+ struct intel_mp_floating *mpf;
+ struct mp_config_table *mpc;
+ struct mp_config_table *mpc_new;
+
+ if (!enable_update_mptable)
+ return 0;
+
+ mpf = mpf_found;
+ if (!mpf)
+ return 0;
+
+ /*
+ * Now see if we need to go further.
+ */
+ if (mpf->mpf_feature1 != 0)
+ return 0;
+
+ if (!mpf->mpf_physptr)
+ return 0;
+
+ mpc = phys_to_virt(mpf->mpf_physptr);
+
+ if (!smp_check_mpc(mpc, oem, str))
+ return 0;
+
+ printk(KERN_INFO "mpf: %lx\n", virt_to_phys(mpf));
+ printk(KERN_INFO "mpf_physptr: %x\n", mpf->mpf_physptr);
+
+ if (mpc_new_phys && mpc->mpc_length > mpc_new_length) {
+ mpc_new_phys = 0;
+ printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k\n",
+ mpc_new_length);
+ }
+
+ if (!mpc_new_phys) {
+ unsigned char old, new;
+ /* check if we can change the postion */
+ mpc->mpc_checksum = 0;
+ old = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
+ mpc->mpc_checksum = 0xff;
+ new = mpf_checksum((unsigned char *)mpc, mpc->mpc_length);
+ if (old == new) {
+ printk(KERN_INFO "mpc is readonly, please try alloc_mptable instead\n");
+ return 0;
+ }
+ printk(KERN_INFO "use in-positon replacing\n");
+ } else {
+ mpf->mpf_physptr = mpc_new_phys;
+ mpc_new = phys_to_virt(mpc_new_phys);
+ memcpy(mpc_new, mpc, mpc->mpc_length);
+ mpc = mpc_new;
+ /* check if we can modify that */
+ if (mpc_new_phys - mpf->mpf_physptr) {
+ struct intel_mp_floating *mpf_new;
+ /* steal 16 bytes from [0, 1k) */
+ printk(KERN_INFO "mpf new: %x\n", 0x400 - 16);
+ mpf_new = phys_to_virt(0x400 - 16);
+ memcpy(mpf_new, mpf, 16);
+ mpf = mpf_new;
+ mpf->mpf_physptr = mpc_new_phys;
+ }
+ mpf->mpf_checksum = 0;
+ mpf->mpf_checksum -= mpf_checksum((unsigned char *)mpf, 16);
+ printk(KERN_INFO "mpf_physptr new: %x\n", mpf->mpf_physptr);
+ }
+
+ /*
+ * only replace the one with mp_INT and
+ * MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW,
+ * already in mp_irqs , stored by ... and mp_config_acpi_gsi,
+ * may need pci=routeirq for all coverage
+ */
+ replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
+
+ return 0;
+}
+
+late_initcall(update_mp_table);
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -56,6 +56,7 @@
#include <asm/desc.h>
#include <video/edid.h>
#include <asm/e820.h>
+#include <asm/mpspec.h>
#include <asm/dma.h>
#include <asm/gart.h>
#include <asm/mpspec.h>
@@ -372,6 +373,9 @@ void __init setup_arch(char **cmdline_p)
* we are rounding upwards:
*/
end_pfn = e820_end_of_ram();
+
+ /* pre allocte 4k for mptable mpc */
+ early_reserve_e820_mpc_new();
/* update e820 for memory not covered by WB MTRRs */
mtrr_bp_init();
if (mtrr_trim_uncached_memory(end_pfn)) {
Index: linux-2.6/drivers/acpi/pci_irq.c
===================================================================
--- linux-2.6.orig/drivers/acpi/pci_irq.c
+++ linux-2.6/drivers/acpi/pci_irq.c
@@ -570,6 +570,9 @@ int acpi_pci_irq_enable(struct pci_dev *
(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
+ mp_config_acpi_gsi(dev->bus->number, dev->devfn, dev->pin, irq,
+ triggering, polarity);
+
return 0;
}
Index: linux-2.6/include/asm-x86/e820_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/e820_64.h
+++ linux-2.6/include/asm-x86/e820_64.h
@@ -50,6 +50,8 @@ extern void update_e820(void);
extern void reserve_early(unsigned long start, unsigned long end, char *name);
extern void free_early(unsigned long start, unsigned long end);
extern void early_res_to_bootmem(unsigned long start, unsigned long end);
+extern unsigned long early_reserve_e820(unsigned long sizet,
+ unsigned long align);
#endif/*!__ASSEMBLY__*/
Index: linux-2.6/include/asm-x86/mpspec.h
===================================================================
--- linux-2.6.orig/include/asm-x86/mpspec.h
+++ linux-2.6/include/asm-x86/mpspec.h
@@ -41,6 +41,7 @@ extern unsigned long mp_lapic_addr;
extern void find_smp_config(void);
extern void get_smp_config(void);
+extern void early_reserve_e820_mpc_new(void);
void __cpuinit generic_processor_info(int apicid, int version);
#ifdef CONFIG_ACPI
@@ -49,6 +50,8 @@ extern void mp_override_legacy_irq(u8 bu
u32 gsi);
extern void mp_config_acpi_legacy_irqs(void);
extern int mp_register_gsi(u32 gsi, int edge_level, int active_high_low);
+extern int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
+ u32 gsi, int triggering, int polarity);
#endif /* CONFIG_ACPI */
#define PHYSID_ARRAY_SIZE BITS_TO_LONGS(MAX_APICS)
--
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