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authorSuresh Siddha <suresh.b.siddha@intel.com>2009-03-16 17:04:53 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2009-03-17 15:36:40 -0700
commit4c5502b1c5744b2090414e1b80ca6388d5c46e06 (patch)
tree6447f553238a2522719fcf3c28b33a19e516f71c /drivers/pci/intr_remapping.c
parent0ca0f16fd17c5d880dd0abbe03595b0c7c5b3c95 (diff)
downloadlinux-4c5502b1c5744b2090414e1b80ca6388d5c46e06.tar.bz2
x86, x2apic: fix lock ordering during IRQ migration
Impact: fix potential deadlock on x2apic fix "hard-safe -> hard-unsafe lock order detected" with irq_2_ir_lock On x2apic enabled system: [ INFO: hard-safe -> hard-unsafe lock order detected ] 2.6.27-03151-g4480f15b #1 ------------------------------------------------------ swapper/1 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: (irq_2_ir_lock){--..}, at: [<ffffffff8038ebc0>] get_irte+0x2f/0x95 and this task is already holding: (&irq_desc_lock_class){+...}, at: [<ffffffff802649ed>] setup_irq+0x67/0x281 which would create a new lock dependency: (&irq_desc_lock_class){+...} -> (irq_2_ir_lock){--..} but this new dependency connects a hard-irq-safe lock: (&irq_desc_lock_class){+...} ... which became hard-irq-safe at: [<ffffffffffffffff>] 0xffffffffffffffff to a hard-irq-unsafe lock: (irq_2_ir_lock){--..} ... which became hard-irq-unsafe at: ... [<ffffffff802547b5>] __lock_acquire+0x571/0x706 [<ffffffff8025499f>] lock_acquire+0x55/0x71 [<ffffffff8062f2c4>] _spin_lock+0x2c/0x38 [<ffffffff8038ee50>] alloc_irte+0x8a/0x14b [<ffffffff8021f733>] setup_IO_APIC_irq+0x119/0x30e [<ffffffff8090860e>] setup_IO_APIC+0x146/0x6e5 [<ffffffff809058fc>] native_smp_prepare_cpus+0x24e/0x2e9 [<ffffffff808f982c>] kernel_init+0x5a/0x176 [<ffffffff8020c289>] child_rip+0xa/0x11 [<ffffffffffffffff>] 0xffffffffffffffff Fix this theoretical lock order issue by using spin_lock_irqsave() instead of spin_lock() Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'drivers/pci/intr_remapping.c')
-rw-r--r--drivers/pci/intr_remapping.c58
1 files changed, 33 insertions, 25 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 8e44db040db7..5ffa65fffb6a 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -117,21 +117,22 @@ int get_irte(int irq, struct irte *entry)
{
int index;
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
if (!entry)
return -1;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
index = irq_iommu->irte_index + irq_iommu->sub_handle;
*entry = *(irq_iommu->iommu->ir_table->base + index);
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return 0;
}
@@ -141,6 +142,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
struct irq_2_iommu *irq_iommu;
u16 index, start_index;
unsigned int mask = 0;
+ unsigned long flags;
int i;
if (!count)
@@ -170,7 +172,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
return -1;
}
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
do {
for (i = index; i < index + count; i++)
if (table->base[i].present)
@@ -182,7 +184,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
index = (index + count) % INTR_REMAP_TABLE_ENTRIES;
if (index == start_index) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
printk(KERN_ERR "can't allocate an IRTE\n");
return -1;
}
@@ -193,7 +195,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
irq_iommu = irq_2_iommu_alloc(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
printk(KERN_ERR "can't allocate irq_2_iommu\n");
return -1;
}
@@ -203,7 +205,7 @@ int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
irq_iommu->sub_handle = 0;
irq_iommu->irte_mask = mask;
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return index;
}
@@ -223,30 +225,32 @@ int map_irq_to_irte_handle(int irq, u16 *sub_handle)
{
int index;
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
*sub_handle = irq_iommu->sub_handle;
index = irq_iommu->irte_index;
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return index;
}
int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
{
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = irq_2_iommu_alloc(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
printk(KERN_ERR "can't allocate irq_2_iommu\n");
return -1;
}
@@ -256,7 +260,7 @@ int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
irq_iommu->sub_handle = subhandle;
irq_iommu->irte_mask = 0;
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return 0;
}
@@ -264,11 +268,12 @@ int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
{
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
@@ -277,7 +282,7 @@ int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
irq_iommu->sub_handle = 0;
irq_2_iommu(irq)->irte_mask = 0;
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return 0;
}
@@ -289,11 +294,12 @@ int modify_irte(int irq, struct irte *irte_modified)
struct irte *irte;
struct intel_iommu *iommu;
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
@@ -306,7 +312,7 @@ int modify_irte(int irq, struct irte *irte_modified)
__iommu_flush_cache(iommu, irte, sizeof(*irte));
rc = qi_flush_iec(iommu, index, 0);
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return rc;
}
@@ -317,11 +323,12 @@ int flush_irte(int irq)
int index;
struct intel_iommu *iommu;
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
@@ -330,7 +337,7 @@ int flush_irte(int irq)
index = irq_iommu->irte_index + irq_iommu->sub_handle;
rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return rc;
}
@@ -363,11 +370,12 @@ int free_irte(int irq)
struct irte *irte;
struct intel_iommu *iommu;
struct irq_2_iommu *irq_iommu;
+ unsigned long flags;
- spin_lock(&irq_2_ir_lock);
+ spin_lock_irqsave(&irq_2_ir_lock, flags);
irq_iommu = valid_irq_2_iommu(irq);
if (!irq_iommu) {
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return -1;
}
@@ -387,7 +395,7 @@ int free_irte(int irq)
irq_iommu->sub_handle = 0;
irq_iommu->irte_mask = 0;
- spin_unlock(&irq_2_ir_lock);
+ spin_unlock_irqrestore(&irq_2_ir_lock, flags);
return rc;
}