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path: root/drivers/pci/intr_remapping.c
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Diffstat (limited to 'drivers/pci/intr_remapping.c')
-rw-r--r--drivers/pci/intr_remapping.c110
1 files changed, 81 insertions, 29 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 9d07a05d26f1..b041a409f4a7 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;
}
@@ -302,11 +308,11 @@ int modify_irte(int irq, struct irte *irte_modified)
index = irq_iommu->irte_index + irq_iommu->sub_handle;
irte = &iommu->ir_table->base[index];
- set_64bit((unsigned long *)irte, irte_modified->low | (1 << 1));
+ set_64bit((unsigned long *)irte, irte_modified->low);
__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;
}
@@ -378,7 +386,7 @@ int free_irte(int irq)
if (!irq_iommu->sub_handle) {
for (i = 0; i < (1 << irq_iommu->irte_mask); i++)
- set_64bit((unsigned long *)irte, 0);
+ set_64bit((unsigned long *)(irte + i), 0);
rc = qi_flush_iec(iommu, index, irq_iommu->irte_mask);
}
@@ -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;
}
@@ -439,12 +447,12 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
struct page *pages;
ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
- GFP_KERNEL);
+ GFP_ATOMIC);
if (!iommu->ir_table)
return -ENOMEM;
- pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
+ pages = alloc_pages(GFP_ATOMIC | __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
if (!pages) {
printk(KERN_ERR "failed to allocate pages of order %d\n",
@@ -459,11 +467,55 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
return 0;
}
+/*
+ * Disable Interrupt Remapping.
+ */
+static void disable_intr_remapping(struct intel_iommu *iommu)
+{
+ unsigned long flags;
+ u32 sts;
+
+ if (!ecap_ir_support(iommu->ecap))
+ return;
+
+ spin_lock_irqsave(&iommu->register_lock, flags);
+
+ sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
+ if (!(sts & DMA_GSTS_IRES))
+ goto end;
+
+ iommu->gcmd &= ~DMA_GCMD_IRE;
+ writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
+
+ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+ readl, !(sts & DMA_GSTS_IRES), sts);
+
+end:
+ spin_unlock_irqrestore(&iommu->register_lock, flags);
+}
+
int __init enable_intr_remapping(int eim)
{
struct dmar_drhd_unit *drhd;
int setup = 0;
+ for_each_drhd_unit(drhd) {
+ struct intel_iommu *iommu = drhd->iommu;
+
+ /*
+ * Clear previous faults.
+ */
+ dmar_fault(-1, iommu);
+
+ /*
+ * Disable intr remapping and queued invalidation, if already
+ * enabled prior to OS handover.
+ */
+ disable_intr_remapping(iommu);
+
+ dmar_disable_qi(iommu);
+ }
+
/*
* check for the Interrupt-remapping support
*/
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.