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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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x86: mpparse: clean up code by introducing a few helper functions
Impact: cleanup Refactor the MP-table parsing code via the introduction of the following helper functions: skip_entry() smp_reserve_bootmem() check_irq_src() check_slot() To simplify the code flow and to reduce the size of the following oversized functions: smp_read_mpc(), smp_scan_config(). There should be no impact to functionality. Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jaswinder Singh Rajput
Ingo Molnar
parent
cde5edbda8
commit
a683027856
1 changed files with 120 additions and 141 deletions
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@ -109,9 +109,6 @@ static void __init MP_bus_info(struct mpc_bus *m)
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} else
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printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
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}
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#endif
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#ifdef CONFIG_X86_IO_APIC
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static int bad_ioapic(unsigned long address)
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{
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@ -224,8 +221,12 @@ static void __init MP_intsrc_info(struct mpc_intsrc *m)
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if (++mp_irq_entries == MAX_IRQ_SOURCES)
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panic("Max # of irq sources exceeded!!\n");
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}
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#else /* CONFIG_X86_IO_APIC */
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static inline void __init MP_bus_info(struct mpc_bus *m) {}
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static inline void __init MP_ioapic_info(struct mpc_ioapic *m) {}
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static inline void __init MP_intsrc_info(struct mpc_intsrc *m) {}
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#endif /* CONFIG_X86_IO_APIC */
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#endif
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static void __init MP_lintsrc_info(struct mpc_lintsrc *m)
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{
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@ -275,6 +276,12 @@ static int __init smp_check_mpc(struct mpc_table *mpc, char *oem, char *str)
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return 1;
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}
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static void skip_entry(unsigned char **ptr, int *count, int size)
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{
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*ptr += size;
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*count += size;
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}
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static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
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{
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char str[16];
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@ -310,55 +317,27 @@ static int __init smp_read_mpc(struct mpc_table *mpc, unsigned early)
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while (count < mpc->length) {
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switch (*mpt) {
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case MP_PROCESSOR:
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{
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struct mpc_cpu *m = (struct mpc_cpu *)mpt;
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/* ACPI may have already provided this data */
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if (!acpi_lapic)
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MP_processor_info(m);
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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/* ACPI may have already provided this data */
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if (!acpi_lapic)
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MP_processor_info((struct mpc_cpu *)&mpt);
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skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
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break;
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case MP_BUS:
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{
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struct mpc_bus *m = (struct mpc_bus *)mpt;
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#ifdef CONFIG_X86_IO_APIC
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MP_bus_info(m);
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#endif
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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MP_bus_info((struct mpc_bus *)&mpt);
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skip_entry(&mpt, &count, sizeof(struct mpc_bus));
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break;
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case MP_IOAPIC:
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{
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#ifdef CONFIG_X86_IO_APIC
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struct mpc_ioapic *m = (struct mpc_ioapic *)mpt;
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MP_ioapic_info(m);
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#endif
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mpt += sizeof(struct mpc_ioapic);
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count += sizeof(struct mpc_ioapic);
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break;
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}
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MP_ioapic_info((struct mpc_ioapic *)&mpt);
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skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
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break;
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case MP_INTSRC:
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{
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#ifdef CONFIG_X86_IO_APIC
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struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
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MP_intsrc_info(m);
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#endif
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mpt += sizeof(struct mpc_intsrc);
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count += sizeof(struct mpc_intsrc);
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break;
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}
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MP_intsrc_info((struct mpc_intsrc *)&mpt);
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skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
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break;
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case MP_LINTSRC:
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{
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struct mpc_lintsrc *m =
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(struct mpc_lintsrc *)mpt;
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MP_lintsrc_info(m);
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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MP_lintsrc_info((struct mpc_lintsrc *)&mpt);
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skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
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break;
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default:
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/* wrong mptable */
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printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
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@ -689,6 +668,31 @@ void __init get_smp_config(void)
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__get_smp_config(0);
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}
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static void smp_reserve_bootmem(struct mpf_intel *mpf)
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{
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unsigned long size = get_mpc_size(mpf->physptr);
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#ifdef CONFIG_X86_32
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/*
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* We cannot access to MPC table to compute table size yet,
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* as only few megabytes from the bottom is mapped now.
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* PC-9800's MPC table places on the very last of physical
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* memory; so that simply reserving PAGE_SIZE from mpf->physptr
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* yields BUG() in reserve_bootmem.
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* also need to make sure physptr is below than max_low_pfn
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* we don't need reserve the area above max_low_pfn
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*/
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unsigned long end = max_low_pfn * PAGE_SIZE;
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if (mpf->physptr < end) {
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if (mpf->physptr + size > end)
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size = end - mpf->physptr;
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reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
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}
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#else
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reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
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#endif
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}
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static int __init smp_scan_config(unsigned long base, unsigned long length,
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unsigned reserve)
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{
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@ -717,35 +721,9 @@ static int __init smp_scan_config(unsigned long base, unsigned long length,
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if (!reserve)
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return 1;
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reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
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BOOTMEM_DEFAULT);
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if (mpf->physptr) {
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unsigned long size = get_mpc_size(mpf->physptr);
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#ifdef CONFIG_X86_32
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/*
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* We cannot access to MPC table to compute
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* table size yet, as only few megabytes from
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* the bottom is mapped now.
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* PC-9800's MPC table places on the very last
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* of physical memory; so that simply reserving
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* PAGE_SIZE from mpf->physptr yields BUG()
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* in reserve_bootmem.
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* also need to make sure physptr is below than
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* max_low_pfn
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* we don't need reserve the area above max_low_pfn
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*/
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unsigned long end = max_low_pfn * PAGE_SIZE;
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if (mpf->physptr < end) {
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if (mpf->physptr + size > end)
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size = end - mpf->physptr;
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reserve_bootmem_generic(mpf->physptr, size,
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BOOTMEM_DEFAULT);
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}
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#else
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reserve_bootmem_generic(mpf->physptr, size,
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BOOTMEM_DEFAULT);
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#endif
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}
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if (mpf->physptr)
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smp_reserve_bootmem(mpf);
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return 1;
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}
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@ -848,7 +826,57 @@ static int __init get_MP_intsrc_index(struct mpc_intsrc *m)
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#define SPARE_SLOT_NUM 20
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static struct mpc_intsrc __initdata *m_spare[SPARE_SLOT_NUM];
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#endif
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static void check_irq_src(struct mpc_intsrc *m, int *nr_m_spare)
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{
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int i;
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apic_printk(APIC_VERBOSE, "OLD ");
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print_MP_intsrc_info(m);
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i = get_MP_intsrc_index(m);
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if (i > 0) {
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assign_to_mpc_intsrc(&mp_irqs[i], m);
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apic_printk(APIC_VERBOSE, "NEW ");
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print_mp_irq_info(&mp_irqs[i]);
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return;
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}
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if (!i) {
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/* legacy, do nothing */
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return;
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}
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if (*nr_m_spare < SPARE_SLOT_NUM) {
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/*
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* not found (-1), or duplicated (-2) are invalid entries,
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* we need to use the slot later
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*/
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m_spare[*nr_m_spare] = m;
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*nr_m_spare += 1;
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}
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}
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#else /* CONFIG_X86_IO_APIC */
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static inline void check_irq_src(struct mpc_intsrc *m, int *nr_m_spare) {}
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#endif /* CONFIG_X86_IO_APIC */
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static int check_slot(unsigned long mpc_new_phys, unsigned long mpc_new_length,
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int count)
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{
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if (!mpc_new_phys) {
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pr_info("No spare slots, try to append...take your risk, "
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"new mpc_length %x\n", count);
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} else {
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if (count <= mpc_new_length)
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pr_info("No spare slots, try to append..., "
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"new mpc_length %x\n", count);
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else {
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pr_err("mpc_new_length %lx is too small\n",
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mpc_new_length);
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return -1;
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}
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}
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return 0;
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}
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static int __init replace_intsrc_all(struct mpc_table *mpc,
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unsigned long mpc_new_phys,
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@ -856,71 +884,30 @@ static int __init replace_intsrc_all(struct mpc_table *mpc,
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{
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#ifdef CONFIG_X86_IO_APIC
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int i;
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int nr_m_spare = 0;
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#endif
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int count = sizeof(*mpc);
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int nr_m_spare = 0;
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unsigned char *mpt = ((unsigned char *)mpc) + count;
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printk(KERN_INFO "mpc_length %x\n", mpc->length);
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while (count < mpc->length) {
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switch (*mpt) {
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case MP_PROCESSOR:
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{
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struct mpc_cpu *m = (struct mpc_cpu *)mpt;
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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skip_entry(&mpt, &count, sizeof(struct mpc_cpu));
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break;
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case MP_BUS:
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{
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struct mpc_bus *m = (struct mpc_bus *)mpt;
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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skip_entry(&mpt, &count, sizeof(struct mpc_bus));
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break;
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case MP_IOAPIC:
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{
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mpt += sizeof(struct mpc_ioapic);
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count += sizeof(struct mpc_ioapic);
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break;
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}
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skip_entry(&mpt, &count, sizeof(struct mpc_ioapic));
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break;
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case MP_INTSRC:
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{
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#ifdef CONFIG_X86_IO_APIC
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struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
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apic_printk(APIC_VERBOSE, "OLD ");
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print_MP_intsrc_info(m);
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i = get_MP_intsrc_index(m);
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if (i > 0) {
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assign_to_mpc_intsrc(&mp_irqs[i], m);
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apic_printk(APIC_VERBOSE, "NEW ");
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print_mp_irq_info(&mp_irqs[i]);
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} else if (!i) {
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/* legacy, do nothing */
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} else if (nr_m_spare < SPARE_SLOT_NUM) {
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/*
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* not found (-1), or duplicated (-2)
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* are invalid entries,
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* we need to use the slot later
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*/
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m_spare[nr_m_spare] = m;
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nr_m_spare++;
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}
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#endif
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mpt += sizeof(struct mpc_intsrc);
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count += sizeof(struct mpc_intsrc);
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break;
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}
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check_irq_src((struct mpc_intsrc *)&mpt, &nr_m_spare);
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skip_entry(&mpt, &count, sizeof(struct mpc_intsrc));
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break;
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case MP_LINTSRC:
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{
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struct mpc_lintsrc *m =
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(struct mpc_lintsrc *)mpt;
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mpt += sizeof(*m);
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count += sizeof(*m);
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break;
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}
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skip_entry(&mpt, &count, sizeof(struct mpc_lintsrc));
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break;
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default:
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/* wrong mptable */
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printk(KERN_ERR "Your mptable is wrong, contact your HW vendor!\n");
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@ -950,16 +937,8 @@ static int __init replace_intsrc_all(struct mpc_table *mpc,
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} else {
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struct mpc_intsrc *m = (struct mpc_intsrc *)mpt;
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count += sizeof(struct mpc_intsrc);
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if (!mpc_new_phys) {
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printk(KERN_INFO "No spare slots, try to append...take your risk, new mpc_length %x\n", count);
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} else {
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if (count <= mpc_new_length)
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printk(KERN_INFO "No spare slots, try to append..., new mpc_length %x\n", count);
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else {
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printk(KERN_ERR "mpc_new_length %lx is too small\n", mpc_new_length);
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goto out;
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}
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}
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if (!check_slot(mpc_new_phys, mpc_new_length, count))
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goto out;
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assign_to_mpc_intsrc(&mp_irqs[i], m);
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mpc->length = count;
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mpt += sizeof(struct mpc_intsrc);
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