| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 27 May 2014 16:24:37 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Thomas Gleixner <tglx@...utronix.de>,
Grant Likely <grant.likely@...aro.org>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Randy Dunlap <rdunlap@...radead.org>,
Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Tony Luck <tony.luck@...el.com>,
Joerg Roedel <joro@...tes.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
linux-pm@...r.kernel.org
Subject: [RFC Patch V1 4/4] x86, irq, ACPI: implement interface to support ACPI based IOAPIC hot-removal
Implement acpi_unregister_ioapic() to support ACPI based IOAPIC hot-removal.
An IOAPIC could only be removed when all its pins are unused.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
arch/x86/include/asm/io_apic.h | 1 +
arch/x86/kernel/acpi/boot.c | 13 ++++++++----
arch/x86/kernel/apic/io_apic.c | 46 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 56 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 64379c285435..256ec8d9050c 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -183,6 +183,7 @@ extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags);
extern void mp_unmap_irq(int irq);
extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
ioapic_create_domain_fn cb, void *arg);
+extern int mp_unregister_ioapic(u32 gsi_base);
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/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index d807e16f8fec..c17cc0510040 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -672,15 +672,20 @@ int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
return ret;
}
-
EXPORT_SYMBOL(acpi_register_ioapic);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
- /* TBD */
- return -EINVAL;
-}
+ int ret = -ENOSYS;
+
+#ifdef CONFIG_X86_IO_APIC
+ down_write(&acpi_ioapic_rwsem);
+ ret = mp_unregister_ioapic(gsi_base);
+ up_write(&acpi_ioapic_rwsem);
+#endif
+ return ret;
+}
EXPORT_SYMBOL(acpi_unregister_ioapic);
static int __init acpi_parse_sbf(struct acpi_table_header *table)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 4bddff760ff4..4343247d15b1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2949,6 +2949,18 @@ static int ioapic_create_irqdomain(int idx)
return 0;
}
+static void ioapic_destroy_irqdomain(int idx)
+{
+ if (ioapics[idx].irqdomain) {
+ irq_domain_remove(ioapics[idx].irqdomain);
+ ioapics[idx].irqdomain = NULL;
+ }
+ if (ioapics[idx].pin_info) {
+ kfree(ioapics[idx].pin_info);
+ ioapics[idx].pin_info = NULL;
+ }
+}
+
static void ioapic_create_irqdomains(void)
{
int idx;
@@ -3904,6 +3916,40 @@ int mp_register_ioapic(int id, u32 address, u32 gsi_base,
return 0;
}
+int mp_unregister_ioapic(u32 gsi_base)
+{
+ int ioapic, pin;
+ int found = 0;
+ struct mp_pin_info *pin_info;
+
+ for_each_ioapic(ioapic)
+ if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
+ found = 1;
+ break;
+ }
+ if (!found) {
+ pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
+ return -ENODEV;
+ }
+
+ for_each_pin(ioapic, pin) {
+ pin_info = mp_pin_info(ioapic, pin);
+ if (pin_info->count) {
+ pr_warn("pin%d on IOAPIC%d is still in use.\n",
+ pin, ioapic);
+ return -EBUSY;
+ }
+ }
+
+ /* Mark entry not present */
+ ioapics[ioapic].nr_registers = 0;
+ ioapic_destroy_irqdomain(ioapic);
+ clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
+ memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
+
+ return 0;
+}
+
struct irq_domain *mp_irqdomain_create(int ioapic, struct device_node *np,
const struct irq_domain_ops *ops)
{
--
1.7.10.4
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists