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iommu/amd: Avoid locking get_irq_table() from atomic context 

get_irq_table() previously acquired amd_iommu_devtable_lock which is not
a raw lock, and thus cannot be acquired from atomic context on
PREEMPT_RT.  Many calls to modify_irte*() come from atomic context due to
the IRQ desc->lock, as does amd_iommu_update_ga() due to the preemption
disabling in vcpu_load/put().

The only difference between calling get_irq_table() and reading from
irq_lookup_table[] directly, other than the lock acquisition and
amd_iommu_rlookup_table[] check, is if the table entry is unpopulated,
which should never happen when looking up a devid that came from an
irq_2_irte struct, as get_irq_table() would have already been called on
that devid during irq_remapping_alloc().

The lock acquisition is not needed in these cases because entries in
irq_lookup_table[] never change once non-NULL -- nor would the
amd_iommu_devtable_lock usage in get_irq_table() provide meaningful
protection if they did, since it's released before using the looked up
table in the get_irq_table() caller.

Rename the old get_irq_table() to alloc_irq_table(), and create a new
lockless get_irq_table() to be used in non-allocating contexts that WARNs
if it doesn't find what it's looking for.

Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Scott Wood 2018-02-14 17:36:28 -06:00 committed by Joerg Roedel
parent 01ee04bade
commit df42a04b15
1 changed files with 22 additions and 7 deletions
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29
drivers/iommu/amd_iommu.c
View File

@ -3595,7 +3595,22 @@ static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
amd_iommu_dev_table[devid].data[2] = dte;
}
static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
static struct irq_remap_table *get_irq_table(u16 devid)
{
struct irq_remap_table *table;
if (WARN_ONCE(!amd_iommu_rlookup_table[devid],
"%s: no iommu for devid %x\n", __func__, devid))
return NULL;
table = irq_lookup_table[devid];
if (WARN_ONCE(!table, "%s: no table for devid %x\n", __func__, devid))
return NULL;
return table;
}
static struct irq_remap_table *alloc_irq_table(u16 devid, bool ioapic)
{
struct irq_remap_table *table = NULL;
struct amd_iommu *iommu;
@ -3682,7 +3697,7 @@ static int alloc_irq_index(u16 devid, int count, bool align)
if (!iommu)
return -ENODEV;
table = get_irq_table(devid, false);
table = alloc_irq_table(devid, false);
if (!table)
return -ENODEV;
@ -3733,7 +3748,7 @@ static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
if (iommu == NULL)
return -EINVAL;
table = get_irq_table(devid, false);
table = get_irq_table(devid);
if (!table)
return -ENOMEM;
@ -3766,7 +3781,7 @@ static int modify_irte(u16 devid, int index, union irte *irte)
if (iommu == NULL)
return -EINVAL;
table = get_irq_table(devid, false);
table = get_irq_table(devid);
if (!table)
return -ENOMEM;
@ -3790,7 +3805,7 @@ static void free_irte(u16 devid, int index)
if (iommu == NULL)
return;
table = get_irq_table(devid, false);
table = get_irq_table(devid);
if (!table)
return;
@ -4108,7 +4123,7 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
return ret;
if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
if (get_irq_table(devid, true))
if (alloc_irq_table(devid, true))
index = info->ioapic_pin;
else
ret = -ENOMEM;
@ -4391,7 +4406,7 @@ int amd_iommu_update_ga(int cpu, bool is_run, void *data)
if (!iommu)
return -ENODEV;
irt = get_irq_table(devid, false);
irt = get_irq_table(devid);
if (!irt)
return -ENODEV;