Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> --- arch/x86/include/asm/io_apic.h | 4 +- arch/x86/kernel/apic/io_apic.c | 143 ++++++++++++++++++++++++++-------------- 2 files changed, 94 insertions(+), 53 deletions(-) diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h index 6b40122bec0c..64379c285435 100644 --- a/arch/x86/include/asm/io_apic.h +++ b/arch/x86/include/asm/io_apic.h @@ -181,8 +181,8 @@ extern int mp_find_ioapic_pin(int ioapic, u32 gsi); extern u32 mp_pin_to_gsi(int ioapic, int pin); extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags); extern void mp_unmap_irq(int irq); -extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base, - ioapic_create_domain_fn cb, void *arg); +extern int mp_register_ioapic(int id, u32 address, u32 gsi_base, + ioapic_create_domain_fn cb, void *arg); extern struct irq_domain *mp_irqdomain_create(int ioapic, struct device_node *np, const struct irq_domain_ops *ops); extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq, diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index c7c84d5c0e57..f70fa239f34b 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -85,6 +85,7 @@ int sis_apic_bug = -1; static DEFINE_RAW_SPINLOCK(ioapic_lock); static DEFINE_RAW_SPINLOCK(vector_lock); static DEFINE_MUTEX(ioapic_mutex); +static int ioapic_initialized; struct mp_pin_info { int trigger; @@ -2920,19 +2921,40 @@ out: */ #define PIC_IRQS (1UL << PIC_CASCADE_IR) -static void ioapic_create_irqdomains(void) +static int ioapic_create_irqdomain(int idx) { - int i, size; - struct ioapic *ip; + int size; + struct ioapic *ip = &ioapics[idx]; - for_each_ioapic(i) { - ip = &ioapics[i]; - size = sizeof(struct mp_pin_info) * mp_ioapic_pin_count(i); - ip->pin_info = kzalloc(size, GFP_KERNEL); - BUG_ON(!ip->pin_info); - if (ip->irqdomain_cb) - ip->irqdomain = ip->irqdomain_cb(i, ip->irqdomain_arg); + size = sizeof(struct mp_pin_info) * mp_ioapic_pin_count(idx); + ip->pin_info = kzalloc(size, GFP_KERNEL); + if (ip->pin_info == NULL && ioapic_initialized) { + pr_warn("failed to allocate memory IOAPIC pin_info.\n"); + return -ENOMEM; } + BUG_ON(!ip->pin_info); + + if (ip->irqdomain_cb) { + ip->irqdomain = ip->irqdomain_cb(idx, ip->irqdomain_arg); + if (ip->irqdomain == NULL && ioapic_initialized) { + pr_warn("failed to create irqdomain for IOAPIC%d\n", + idx); + kfree(ip->pin_info); + ip->pin_info = NULL; + return -ENOMEM; + } + BUG_ON(!ip->irqdomain); + } + + return 0; +} + +static void ioapic_create_irqdomains(void) +{ + int idx; + + for_each_ioapic(idx) + ioapic_create_irqdomain(idx); } void __init setup_IO_APIC(void) @@ -2955,6 +2977,8 @@ void __init setup_IO_APIC(void) init_IO_APIC_traps(); if (legacy_pic->nr_legacy_irqs) check_timer(); + + ioapic_initialized = 1; } /* @@ -3408,7 +3432,7 @@ io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr) return ret; } -static int __init io_apic_get_redir_entries(int ioapic) +static int io_apic_get_redir_entries(int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; @@ -3455,7 +3479,7 @@ int __init arch_probe_nr_irqs(void) } #ifdef CONFIG_X86_32 -static int __init io_apic_get_unique_id(int ioapic, int apic_id) +static int io_apic_get_unique_id(int ioapic, int apic_id) { union IO_APIC_reg_00 reg_00; static physid_mask_t apic_id_map = PHYSID_MASK_NONE; @@ -3530,7 +3554,7 @@ static int __init io_apic_get_unique_id(int ioapic, int apic_id) return apic_id; } -static u8 __init io_apic_unique_id(u8 id) +static u8 io_apic_unique_id(u8 id) { if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && !APIC_XAPIC(apic_version[boot_cpu_physical_apicid])) @@ -3539,7 +3563,7 @@ static u8 __init io_apic_unique_id(u8 id) return id; } #else -static u8 __init io_apic_unique_id(u8 id) +static u8 io_apic_unique_id(u8 id) { int i; DECLARE_BITMAP(used, 256); @@ -3553,7 +3577,7 @@ static u8 __init io_apic_unique_id(u8 id) } #endif -static int __init io_apic_get_version(int ioapic) +static int io_apic_get_version(int ioapic) { union IO_APIC_reg_01 reg_01; unsigned long flags; @@ -3757,21 +3781,7 @@ int mp_find_ioapic_pin(int ioapic, u32 gsi) return gsi - gsi_cfg->gsi_base; } -static __init int bad_ioapic(unsigned long address) -{ - if (nr_ioapics >= MAX_IO_APICS) { - pr_warn("WARNING: Max # of I/O APICs (%d) exceeded (found %d), skipping\n", - MAX_IO_APICS, nr_ioapics); - return 1; - } - if (!address) { - pr_warn("WARNING: Bogus (zero) I/O APIC address found in table, skipping!\n"); - return 1; - } - return 0; -} - -static __init int bad_ioapic_register(int idx) +static int bad_ioapic_register(int idx) { union IO_APIC_reg_00 reg_00; union IO_APIC_reg_01 reg_01; @@ -3790,30 +3800,43 @@ static __init int bad_ioapic_register(int idx) return 0; } -void __init mp_register_ioapic(int id, u32 address, u32 gsi_base, - ioapic_create_domain_fn cb, void *arg) +static int find_free_ioapic_entry(void) +{ + return nr_ioapics; +} + +int mp_register_ioapic(int id, u32 address, u32 gsi_base, + ioapic_create_domain_fn cb, void *arg) { - int idx = 0; - int entries; + u32 gsi_end; + int idx, ioapic, entries; struct mp_ioapic_gsi *gsi_cfg; - if (bad_ioapic(address)) - return; + if (!address) { + pr_warn("WARNING: Bogus (zero) I/O APIC address found in table, skipping!\n"); + return -EINVAL; + } + for_each_ioapic(ioapic) + if (ioapics[ioapic].mp_config.apicaddr == address) { + pr_warn("address 0x%x conflicts with IOAPIC%d\n", + address, ioapic); + return -EEXIST; + } - idx = nr_ioapics; + idx = find_free_ioapic_entry(); + if (idx >= MAX_IO_APICS) { + pr_warn("WARNING: Max # of I/O APICs (%d) exceeded (found %d), skipping\n", + MAX_IO_APICS, idx); + return -ENOSPC; + } ioapics[idx].mp_config.type = MP_IOAPIC; ioapics[idx].mp_config.flags = MPC_APIC_USABLE; ioapics[idx].mp_config.apicaddr = address; - ioapics[idx].irqdomain_cb = cb; - ioapics[idx].irqdomain_arg = arg; - ioapics[idx].irqdomain = NULL; - set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address); - if (bad_ioapic_register(idx)) { clear_fixmap(FIX_IO_APIC_BASE_0 + idx); - return; + return -ENODEV; } ioapics[idx].mp_config.apicid = io_apic_unique_id(id); @@ -3824,24 +3847,43 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base, * and to prevent reprogramming of IOAPIC pins (PCI GSIs). */ entries = io_apic_get_redir_entries(idx); + gsi_end = gsi_base + entries - 1; + for_each_ioapic(ioapic) { + gsi_cfg = mp_ioapic_gsi_routing(idx); + if ((gsi_base >= gsi_cfg->gsi_base && + gsi_base <= gsi_cfg->gsi_end) || + (gsi_end >= gsi_cfg->gsi_base && + gsi_end <= gsi_cfg->gsi_end)) { + pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n", + gsi_base, gsi_end, + gsi_cfg->gsi_base, gsi_cfg->gsi_end); + clear_fixmap(FIX_IO_APIC_BASE_0 + idx); + return -EEXIST; + } + } gsi_cfg = mp_ioapic_gsi_routing(idx); gsi_cfg->gsi_base = gsi_base; - gsi_cfg->gsi_end = gsi_base + entries - 1; + gsi_cfg->gsi_end = gsi_end; - /* - * The number of IO-APIC IRQ registers (== #pins): - */ - ioapics[idx].nr_registers = entries; + ioapics[idx].irqdomain_cb = cb; + ioapics[idx].irqdomain_arg = arg; + ioapics[idx].irqdomain = NULL; if (gsi_cfg->gsi_end >= gsi_top) gsi_top = gsi_cfg->gsi_end + 1; + if (nr_ioapics <= idx) + nr_ioapics = idx + 1; + + /* Set nr_registers to mark entry present */ + ioapics[idx].nr_registers = entries; + pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n", idx, mpc_ioapic_id(idx), mpc_ioapic_ver(idx), mpc_ioapic_addr(idx), gsi_cfg->gsi_base, gsi_cfg->gsi_end); - nr_ioapics++; + return 0; } struct irq_domain *mp_irqdomain_create(int ioapic, struct device_node *np, @@ -3852,8 +3894,7 @@ struct irq_domain *mp_irqdomain_create(int ioapic, struct device_node *np, int hwirqs = mp_ioapic_pin_count(ioapic); domain = irq_domain_add_linear(np, hwirqs, ops, (void *)(long)ioapic); - BUG_ON(!domain); - if (gsi_cfg->gsi_base == 0) + if (domain && gsi_cfg->gsi_base == 0) irq_set_default_host(domain); return domain; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html