From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jiang Liu To: Benjamin Herrenschmidt , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "Rafael J. Wysocki" , Bjorn Helgaas , Randy Dunlap , Yinghai Lu , Borislav Petkov , Grant Likely , Len Brown , Pavel Machek , x86@kernel.org, Jiang Liu , Prarit Bhargava Cc: Konrad Rzeszutek Wilk , Andrew Morton , Tony Luck , Joerg Roedel , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Ingo Molnar , linux-pm@vger.kernel.org Subject: [Patch v4 12/16] x86, irq, ACPI: Implement interface to support ACPI based IOAPIC hot-addition Date: Thu, 28 Aug 2014 10:22:37 +0800 Message-Id: <1409192561-19744-13-git-send-email-jiang.liu@linux.intel.com> In-Reply-To: <1409192561-19744-1-git-send-email-jiang.liu@linux.intel.com> References: <1409192561-19744-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-ID: Implement acpi_register_ioapic() and enhance mp_register_ioapic() to support ACPI based IOAPIC hot-addition. Signed-off-by: Jiang Liu --- arch/x86/kernel/acpi/boot.c | 31 +++++++++++++++++++++++++++++-- arch/x86/kernel/apic/io_apic.c | 27 ++++++++++++++++++++++++--- 2 files changed, 53 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index e23f7460c3f8..796cd9e31ef3 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -764,8 +764,35 @@ EXPORT_SYMBOL(acpi_unmap_lsapic); int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base) { - /* TBD */ - return -EINVAL; + int ret = -ENOSYS; +#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC + int ioapic_id; + u64 addr; + struct ioapic_domain_cfg cfg = { + .type = IOAPIC_DOMAIN_DYNAMIC, + .ops = &acpi_irqdomain_ops, + }; + + ioapic_id = acpi_get_ioapic_id(handle, gsi_base, &addr); + if (ioapic_id < 0) { + unsigned long long uid; + acpi_status status; + + status = acpi_evaluate_integer(handle, METHOD_NAME__UID, + NULL, &uid); + if (ACPI_FAILURE(status)) { + acpi_handle_warn(handle, "failed to get IOAPIC ID.\n"); + return -EINVAL; + } + ioapic_id = (int)uid; + } + + down_write(&acpi_ioapic_rwsem); + ret = mp_register_ioapic(ioapic_id, phys_addr, gsi_base, &cfg); + up_write(&acpi_ioapic_rwsem); +#endif + + return ret; } EXPORT_SYMBOL(acpi_register_ioapic); diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 6e67af0c5f99..b286461cabf9 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -3851,7 +3851,13 @@ static int bad_ioapic_register(int idx) static int find_free_ioapic_entry(void) { - return nr_ioapics; + int idx; + + for (idx = 0; idx < MAX_IO_APICS; idx++) + if (ioapics[idx].nr_registers == 0) + return idx; + + return MAX_IO_APICS; } int mp_register_ioapic(int id, u32 address, u32 gsi_base, @@ -3867,8 +3873,15 @@ int mp_register_ioapic(int id, u32 address, u32 gsi_base, } for_each_ioapic(ioapic) if (ioapics[ioapic].mp_config.apicaddr == address) { - pr_warn("address 0x%x conflicts with IOAPIC%d\n", - address, ioapic); + /* + * IOAPIC unit may also be visible in PCI scope. + * When ioapic PCI driver's probe() is called, + * the IOAPIC unit may have already been initialized + * at boot time. + */ + if (!ioapic_initialized) + pr_warn("address 0x%x conflicts with IOAPIC%d\n", + address, ioapic); return -EEXIST; } @@ -3918,6 +3931,14 @@ int mp_register_ioapic(int id, u32 address, u32 gsi_base, ioapics[idx].irqdomain = NULL; ioapics[idx].irqdomain_cfg = *cfg; + if (ioapic_initialized) { + if (mp_irqdomain_create(idx)) { + clear_fixmap(FIX_IO_APIC_BASE_0 + idx); + return -ENOMEM; + } + alloc_ioapic_saved_registers(idx); + } + if (gsi_cfg->gsi_end >= gsi_top) gsi_top = gsi_cfg->gsi_end + 1; if (nr_ioapics <= idx) -- 1.7.10.4