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Subject[PATCH 20/28] iommu/amd: Add routines to manage irq remapping tables
Date
Add routines to:

* Alloc remapping tables and single entries from these
tables
* Change entries in the tables
* Free entries in the table

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu.c | 230 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 230 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 7006605..6ec44ab 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -31,6 +31,12 @@
#include <linux/amd-iommu.h>
#include <linux/notifier.h>
#include <linux/export.h>
+#include <linux/irq.h>
+#include <linux/msi.h>
+#include <asm/irq_remapping.h>
+#include <asm/io_apic.h>
+#include <asm/apic.h>
+#include <asm/hw_irq.h>
#include <asm/msidef.h>
#include <asm/proto.h>
#include <asm/iommu.h>
@@ -3706,3 +3712,227 @@ int amd_iommu_device_info(struct pci_dev *pdev,
return 0;
}
EXPORT_SYMBOL(amd_iommu_device_info);
+
+#ifdef CONFIG_IRQ_REMAP
+
+/*****************************************************************************
+ *
+ * Interrupt Remapping Implementation
+ *
+ *****************************************************************************/
+
+union irte {
+ u32 val;
+ struct {
+ u32 valid : 1,
+ no_fault : 1,
+ int_type : 3,
+ rq_eoi : 1,
+ dm : 1,
+ rsvd_1 : 1,
+ destination : 8,
+ vector : 8,
+ rsvd_2 : 8;
+ } fields;
+};
+
+#define DTE_IRQ_PHYS_ADDR_MASK (((1ULL << 45)-1) << 6)
+#define DTE_IRQ_REMAP_INTCTL (2ULL << 60)
+#define DTE_IRQ_TABLE_LEN (8ULL << 1)
+#define DTE_IRQ_REMAP_ENABLE 1ULL
+
+static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
+{
+ u64 dte;
+
+ dte = amd_iommu_dev_table[devid].data[2];
+ dte &= ~DTE_IRQ_PHYS_ADDR_MASK;
+ dte |= virt_to_phys(table->table);
+ dte |= DTE_IRQ_REMAP_INTCTL;
+ dte |= DTE_IRQ_TABLE_LEN;
+ dte |= DTE_IRQ_REMAP_ENABLE;
+
+ amd_iommu_dev_table[devid].data[2] = dte;
+}
+
+#define IRTE_ALLOCATED (~1U)
+
+static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
+{
+ struct irq_remap_table *table = NULL;
+ struct amd_iommu *iommu;
+ unsigned long flags;
+ u16 alias;
+
+ write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+
+ iommu = amd_iommu_rlookup_table[devid];
+ if (!iommu)
+ goto out_unlock;
+
+ table = irq_lookup_table[devid];
+ if (table)
+ goto out;
+
+ alias = amd_iommu_alias_table[devid];
+ table = irq_lookup_table[alias];
+ if (table) {
+ irq_lookup_table[devid] = table;
+ set_dte_irq_entry(devid, table);
+ iommu_flush_dte(iommu, devid);
+ goto out;
+ }
+
+ /* Nothing there yet, allocate new irq remapping table */
+ table = kzalloc(sizeof(*table), GFP_ATOMIC);
+ if (!table)
+ goto out;
+
+ if (ioapic)
+ /* Keep the first 32 indexes free for IOAPIC interrupts */
+ table->min_index = 32;
+
+ table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_ATOMIC);
+ if (!table->table) {
+ kfree(table);
+ goto out;
+ }
+
+ memset(table->table, 0, MAX_IRQS_PER_TABLE * sizeof(u32));
+
+ if (ioapic) {
+ int i;
+
+ for (i = 0; i < 32; ++i)
+ table->table[i] = IRTE_ALLOCATED;
+ }
+
+ irq_lookup_table[devid] = table;
+ set_dte_irq_entry(devid, table);
+ iommu_flush_dte(iommu, devid);
+ if (devid != alias) {
+ irq_lookup_table[alias] = table;
+ set_dte_irq_entry(devid, table);
+ iommu_flush_dte(iommu, alias);
+ }
+
+out:
+ iommu_completion_wait(iommu);
+
+out_unlock:
+ write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+
+ return table;
+}
+
+static int alloc_irq_index(struct irq_cfg *cfg, u16 devid, int count)
+{
+ struct irq_remap_table *table;
+ unsigned long flags;
+ int index, c;
+
+ table = get_irq_table(devid, false);
+ if (!table)
+ return -ENODEV;
+
+ spin_lock_irqsave(&table->lock, flags);
+
+ /* Scan table for free entries */
+ for (c = 0, index = table->min_index;
+ index < MAX_IRQS_PER_TABLE;
+ ++index) {
+ if (table->table[index] == 0)
+ c += 1;
+ else
+ c = 0;
+
+ if (c == count) {
+ struct irq_2_irte *irte_info;
+
+ for (; c != 0; --c)
+ table->table[index - c + 1] = IRTE_ALLOCATED;
+
+ index -= count - 1;
+
+ irte_info = &cfg->irq_remap_info.irq_2_irte;
+ irte_info->devid = devid;
+ irte_info->index = index;
+ cfg->remapped = true;
+
+ goto out;
+ }
+ }
+
+ index = -ENOSPC;
+
+out:
+ spin_unlock_irqrestore(&table->lock, flags);
+
+ return index;
+}
+
+#ifdef CONFIG_SMP
+static int get_irte(u16 devid, int index, union irte *irte)
+{
+ struct irq_remap_table *table;
+ unsigned long flags;
+
+ table = get_irq_table(devid, false);
+ if (!table)
+ return -ENOMEM;
+
+ spin_lock_irqsave(&table->lock, flags);
+ irte->val = table->table[index];
+ spin_unlock_irqrestore(&table->lock, flags);
+
+ return 0;
+}
+#endif
+
+static int modify_irte(u16 devid, int index, union irte irte)
+{
+ struct irq_remap_table *table;
+ struct amd_iommu *iommu;
+ unsigned long flags;
+
+ iommu = amd_iommu_rlookup_table[devid];
+ if (iommu == NULL)
+ return -EINVAL;
+
+ table = get_irq_table(devid, false);
+ if (!table)
+ return -ENOMEM;
+
+ spin_lock_irqsave(&table->lock, flags);
+ table->table[index] = irte.val;
+ spin_unlock_irqrestore(&table->lock, flags);
+
+ iommu_flush_irt(iommu, devid);
+ iommu_completion_wait(iommu);
+
+ return 0;
+}
+
+static void free_irte(u16 devid, int index)
+{
+ struct irq_remap_table *table;
+ struct amd_iommu *iommu;
+ unsigned long flags;
+
+ iommu = amd_iommu_rlookup_table[devid];
+ if (iommu == NULL)
+ return;
+
+ table = get_irq_table(devid, false);
+ if (!table)
+ return;
+
+ spin_lock_irqsave(&table->lock, flags);
+ table->table[index] = 0;
+ spin_unlock_irqrestore(&table->lock, flags);
+
+ iommu_flush_irt(iommu, devid);
+ iommu_completion_wait(iommu);
+}
+
+#endif
--
1.7.9.5



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