Re: [git-pull -tip] x86: mpparse cleanup

From: Jaswinder Singh Rajput
Date: Wed Mar 18 2009 - 08:47:18 EST

On Wed, 2009-03-18 at 00:03 +0530, Jaswinder Singh Rajput wrote:
> The following changes since commit 0ca0f16fd17c5d880dd0abbe03595b0c7c5b3c95:
> Ingo Molnar (1):
> Merge branches 'x86/apic', 'x86/asm', 'x86/cleanups', 'x86/debug', 'x86/kconfig', 'x86/mm', 'x86/ptrace', 'x86/setup' and 'x86/urgent'; commit 'v2.6.29-rc8' into x86/core
>
> are available in the git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip.git x86/core
>
> Jaswinder Singh Rajput (1):
> x86: mpparse cleanup
>
> arch/x86/kernel/mpparse.c | 311 +++++++++++++++++++++------------------------
> 1 files changed, 146 insertions(+), 165 deletions(-)
>

Complete diff:

Subject: [PATCH] x86: mpparse cleanup

Impact: cleanup

- fix various style problems
- fix header file issues

Introduced helper functions:
skip_entry, smp_reserve_bootmem, check_irq_src and check_slot

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@xxxxxxxxx>
---
arch/x86/kernel/mpparse.c | 311
+++++++++++++++++++++------------------------
1 files changed, 146 insertions(+), 165 deletions(-)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 47673e0..e46d66a 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -7,33 +7,32 @@
* (c) 2008 Alexey Starikovskiy <astarikovskiy@xxxxxxx>
*/

-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/bootmem.h>
#include <linux/kernel_stat.h>
#include <linux/mc146818rtc.h>
+#include <linux/bootmem.h>
#include <linux/bitops.h>
-#include <linux/acpi.h>
#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/acpi.h>
+#include <linux/init.h>
#include <linux/smp.h>
+#include <linux/mm.h>

-#include <asm/mtrr.h>
-#include <asm/mpspec.h>
+#include <asm/trampoline.h>
+#include <asm/bios_ebda.h>
#include <asm/pgalloc.h>
#include <asm/io_apic.h>
+#include <asm/mpspec.h>
#include <asm/proto.h>
-#include <asm/bios_ebda.h>
-#include <asm/e820.h>
-#include <asm/trampoline.h>
#include <asm/setup.h>
+#include <asm/apic.h>
+#include <asm/e820.h>
+#include <asm/mtrr.h>
#include <asm/smp.h>

-#include <asm/apic.h>
/*
* Checksum an MP configuration block.
*/
-
static int __init mpf_checksum(unsigned char *mp, int len)
{
int sum = 0;
@@ -46,8 +45,8 @@ static int __init mpf_checksum(unsigned char *mp, int
len)

static void __init MP_processor_info(struct mpc_cpu *m)
{
- int apicid;
char *bootup_cpu = "";
+ int apicid;

if (!(m->cpuflag & CPU_ENABLED)) {
disabled_cpus++;
@@ -72,6 +71,7 @@ static void __init MP_processor_info(struct mpc_cpu
*m)
static void __init MP_bus_info(struct mpc_bus *m)
{
char str[7];
+
memcpy(str, m->bustype, 6);
str[6] = 0;

@@ -109,9 +109,6 @@ static void __init MP_bus_info(struct mpc_bus *m)
} else
printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
}
-#endif
-
-#ifdef CONFIG_X86_IO_APIC

static int bad_ioapic(unsigned long address)
{
@@ -224,8 +221,12 @@ static void __init MP_intsrc_info(struct mpc_intsrc
*m)
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!!\n");
}
+#else /* CONFIG_X86_IO_APIC */
+static inline void __init MP_bus_info(struct mpc_bus *m) {}
+static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
+static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
+#endif /* CONFIG_X86_IO_APIC */

-#endif

static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
{
@@ -275,6 +276,12 @@ static int __init smp_check_mpc(struct mpc_table
*mpc, char *oem, char *str)
return 1;
}

+static void skip_entry(unsigned char **ptr, int *count, int size)
+{
+ *ptr += size;
+ *count += size;
+}
+
static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
{
char str[16];
@@ -310,59 +317,31 @@ static int __init smp_read_mpc(struct mpc_table
*mpc, unsigned early)
while (count < mpc->length) {
switch (*mpt) {
case MP_PROCESSOR:
- {
- struct mpc_cpu *m = (struct mpc_cpu *)mpt;
- /* ACPI may have already provided this data */
- if (!acpi_lapic)
- MP_processor_info(m);
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ /* ACPI may have already provided this data */
+ if (!acpi_lapic)
+ MP_processor_info((struct mpc_cpu *)&mpt);
+ skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
+ break;
case MP_BUS:
- {
- struct mpc_bus *m = (struct mpc_bus *)mpt;
-#ifdef CONFIG_X86_IO_APIC
- MP_bus_info(m);
-#endif
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ MP_bus_info((struct mpc_bus *)&mpt);
+ skip_entry(&mpt, &count, sizeof(struct mpc_bus));
+ break;
case MP_IOAPIC:
- {
-#ifdef CONFIG_X86_IO_APIC
- struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
- MP_ioapic_info(m);
-#endif
- mpt += sizeof(struct mpc_ioapic);
- count += sizeof(struct mpc_ioapic);
- break;
- }
+ MP_ioapic_info((struct mpc_ioapic *)&mpt);
+ skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
+ break;
case MP_INTSRC:
- {
-#ifdef CONFIG_X86_IO_APIC
- struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
-
- MP_intsrc_info(m);
-#endif
- mpt += sizeof(struct mpc_intsrc);
- count += sizeof(struct mpc_intsrc);
- break;
- }
+ MP_intsrc_info((struct mpc_intsrc *)&mpt);
+ skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
+ break;
case MP_LINTSRC:
- {
- struct mpc_lintsrc *m =
- (struct mpc_lintsrc *)mpt;
- MP_lintsrc_info(m);
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ MP_lintsrc_info((struct mpc_lintsrc *)&mpt);
+ skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
+ break;
default:
/* wrong mptable */
- printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
- printk(KERN_ERR "type %x\n", *mpt);
+ pr_err("Your mptable is wrong, contact your HW vendor!\n");
+ pr_err("type %x\n", *mpt);
print_hex_dump(KERN_ERR, " ", DUMP_PREFIX_ADDRESS, 16,
1, mpc, mpc->length, 1);
count = mpc->length;
@@ -391,14 +370,15 @@ static int __init ELCR_trigger(unsigned int irq)
unsigned int port;

port = 0x4d0 + (irq >> 3);
+
return (inb(port) >> (irq & 7)) & 1;
}

static void __init construct_default_ioirq_mptable(int
mpc_default_type)
{
struct mpc_intsrc intsrc;
- int i;
int ELCR_fallback = 0;
+ int i;

intsrc.type = MP_INTSRC;
intsrc.irqflag = 0; /* conforming */
@@ -443,9 +423,9 @@ static void __init
construct_default_ioirq_mptable(int mpc_default_type)

if (ELCR_fallback) {
/*
- * If the ELCR indicates a level-sensitive interrupt, we
- * copy that information over to the MP table in the
- * irqflag field (level sensitive, active high polarity).
+ * If the ELCR indicates a level-sensitive interrupt,
+ * we copy that information over to the MP table in the
+ * irqflag field(level sensitive, active high polarity)
*/
if (ELCR_trigger(i))
intsrc.irqflag = 13;
@@ -515,9 +495,9 @@ static inline void __init construct_ioapic_table(int
mpc_default_type) { }

static inline void __init construct_default_ISA_mptable(int
mpc_default_type)
{
- struct mpc_cpu processor;
- struct mpc_lintsrc lintsrc;
int linttypes[2] = { mp_ExtINT, mp_NMI };
+ struct mpc_lintsrc lintsrc;
+ struct mpc_cpu processor;
int i;

/*
@@ -689,6 +669,31 @@ void __init get_smp_config(void)
__get_smp_config(0);
}

+static void smp_reserve_bootmem(struct mpf_intel *mpf)
+{
+ unsigned long size = get_mpc_size(mpf->physptr);
+#ifdef CONFIG_X86_32
+ /*
+ * We cannot access to MPC table to compute table size yet,
+ * as only few megabytes from the bottom is mapped now.
+ * PC-9800's MPC table places on the very last of physical
+ * memory; so that simply reserving PAGE_SIZE from mpf->physptr
+ * yields BUG() in reserve_bootmem.
+ * also need to make sure physptr is below than max_low_pfn
+ * we don't need reserve the area above max_low_pfn
+ */
+ unsigned long end = max_low_pfn * PAGE_SIZE;
+
+ if (mpf->physptr < end) {
+ if (mpf->physptr + size > end)
+ size = end - mpf->physptr;
+ reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
+ }
+#else
+ reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
+#endif
+}
+
static int __init smp_scan_config(unsigned long base, unsigned long
length,
unsigned reserve)
{
@@ -717,41 +722,16 @@ static int __init smp_scan_config(unsigned long
base, unsigned long length,
if (!reserve)
return 1;
reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
- BOOTMEM_DEFAULT);
- if (mpf->physptr) {
- unsigned long size = get_mpc_size(mpf->physptr);
-#ifdef CONFIG_X86_32
- /*
- * We cannot access to MPC table to compute
- * table size yet, as only few megabytes from
- * the bottom is mapped now.
- * PC-9800's MPC table places on the very last
- * of physical memory; so that simply reserving
- * PAGE_SIZE from mpf->physptr yields BUG()
- * in reserve_bootmem.
- * also need to make sure physptr is below than
- * max_low_pfn
- * we don't need reserve the area above max_low_pfn
- */
- unsigned long end = max_low_pfn * PAGE_SIZE;
-
- if (mpf->physptr < end) {
- if (mpf->physptr + size > end)
- size = end - mpf->physptr;
- reserve_bootmem_generic(mpf->physptr, size,
- BOOTMEM_DEFAULT);
- }
-#else
- reserve_bootmem_generic(mpf->physptr, size,
BOOTMEM_DEFAULT);
-#endif
- }
+ if (mpf->physptr)
+ smp_reserve_bootmem(mpf);

return 1;
}
bp += 4;
length -= 16;
}
+
return 0;
}

@@ -848,79 +828,88 @@ static int __init get_MP_intsrc_index(struct
mpc_intsrc *m)
#define SPARE_SLOT_NUM 20

static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
-#endif
+
+static void check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
+{
+ int i;
+
+ apic_printk(APIC_VERBOSE, "OLD ");
+ print_MP_intsrc_info(m);
+
+ i = get_MP_intsrc_index(m);
+ if (i > 0) {
+ assign_to_mpc_intsrc(&mp_irqs[i], m);
+ apic_printk(APIC_VERBOSE, "NEW ");
+ print_mp_irq_info(&mp_irqs[i]);
+ return;
+ }
+ if (!i) {
+ /* legacy, do nothing */
+ return;
+ }
+ 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 += 1;
+ }
+}
+#else /* CONFIG_X86_IO_APIC */
+static inline void check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
{}
+#endif /* CONFIG_X86_IO_APIC */
+
+static int check_slot(unsigned long mpc_new_phys, unsigned long
mpc_new_length,
+ int count)
+{
+ if (!mpc_new_phys) {
+ pr_info("No spare slots, try to append...take your risk, "
+ "new mpc_length %x\n", count);
+ } else {
+ if (count <= mpc_new_length)
+ pr_info("No spare slots, try to append..., "
+ "new mpc_length %x\n", count);
+ else {
+ pr_err("mpc_new_length %lx is too small\n",
+ mpc_new_length);
+ return -1;
+ }
+ }
+
+ return 0;
+}

static int __init replace_intsrc_all(struct mpc_table *mpc,
- unsigned long mpc_new_phys,
- unsigned long mpc_new_length)
+ unsigned long mpc_new_phys,
+ unsigned long mpc_new_length)
{
#ifdef CONFIG_X86_IO_APIC
int i;
- int nr_m_spare = 0;
#endif
-
int count = sizeof(*mpc);
+ int nr_m_spare = 0;
unsigned char *mpt = ((unsigned char *)mpc) + count;

printk(KERN_INFO "mpc_length %x\n", mpc->length);
while (count < mpc->length) {
switch (*mpt) {
case MP_PROCESSOR:
- {
- struct mpc_cpu *m = (struct mpc_cpu *)mpt;
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
+ break;
case MP_BUS:
- {
- struct mpc_bus *m = (struct mpc_bus *)mpt;
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ skip_entry(&mpt, &count, sizeof(struct mpc_bus));
+ break;
case MP_IOAPIC:
- {
- mpt += sizeof(struct mpc_ioapic);
- count += sizeof(struct mpc_ioapic);
- break;
- }
+ skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
+ break;
case MP_INTSRC:
- {
-#ifdef CONFIG_X86_IO_APIC
- struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
-
- apic_printk(APIC_VERBOSE, "OLD ");
- print_MP_intsrc_info(m);
- i = get_MP_intsrc_index(m);
- if (i > 0) {
- assign_to_mpc_intsrc(&mp_irqs[i], m);
- apic_printk(APIC_VERBOSE, "NEW ");
- print_mp_irq_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_intsrc);
- count += sizeof(struct mpc_intsrc);
- break;
- }
+ check_irq_src((struct mpc_intsrc *)&mpt, &nr_m_spare);
+ skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
+ break;
case MP_LINTSRC:
- {
- struct mpc_lintsrc *m =
- (struct mpc_lintsrc *)mpt;
- mpt += sizeof(*m);
- count += sizeof(*m);
- break;
- }
+ skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
+ break;
default:
/* wrong mptable */
printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
@@ -950,16 +939,8 @@ static int __init replace_intsrc_all(struct
mpc_table *mpc,
} else {
struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
count += sizeof(struct mpc_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;
- }
- }
+ if (!check_slot(mpc_new_phys, mpc_new_length, count))
+ goto out;
assign_to_mpc_intsrc(&mp_irqs[i], m);
mpc->length = count;
mpt += sizeof(struct mpc_intsrc);
@@ -1044,7 +1025,7 @@ static int __init update_mp_table(void)

if (mpc_new_phys && mpc->length > mpc_new_length) {
mpc_new_phys = 0;
- printk(KERN_INFO "mpc_new_length is %ld, please use alloc_mptable=8k
\n",
+ pr_info("mpc_new_length is %ld, please use alloc_mptable=8k\n",
mpc_new_length);
}

--
1.6.0.6



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