[PART2 PATCH v4 03/11] iommu/amd: Introduce interrupt remapping ops structure

Suravee Suthikulpanit
2016-07-13T14:56:06Z

Currently, IOMMU support two interrupt remapping table entry formats,
32-bit (legacy) and 128-bit (GA). The spec also implies that it might
support additional modes/formats in the future.

So, this patch introduces the new struct amd_irte_ops, which allows
the same code to work with different irte formats by providing hooks
for various operations on an interrupt remapping table entry.

Suggested-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
drivers/iommu/amd_iommu.c | 193 ++++++++++++++++++++++++++++++++++++++--
drivers/iommu/amd_iommu_types.h | 20 +++++
2 files changed, 208 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index ac2962f..139ea8b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3826,11 +3826,13 @@ out:
return index;
}

-static int modify_irte(u16 devid, int index, union irte irte)
+static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte)
{
struct irq_remap_table *table;
struct amd_iommu *iommu;
unsigned long flags;
+ struct irte_ga *entry;
+ struct irte_ga tmp;

iommu = amd_iommu_rlookup_table[devid];
if (iommu == NULL)
@@ -3841,7 +3843,40 @@ static int modify_irte(u16 devid, int index, union irte irte)
return -ENOMEM;

spin_lock_irqsave(&table->lock, flags);
- table->table[index] = irte.val;
+
+ entry = (struct irte_ga *)table->table;
+ entry = &entry[index];
+ memcpy(&tmp, entry, sizeof(struct irte_ga));
+ entry->lo.fields_remap.valid = 0;
+ entry->hi.val = irte->hi.val;
+ entry->hi.fields.ga_root_ptr = tmp.hi.fields.ga_root_ptr;
+ entry->lo.val = irte->lo.val;
+ entry->lo.fields_remap.valid = 1;
+
+ spin_unlock_irqrestore(&table->lock, flags);
+
+ iommu_flush_irt(iommu, devid);
+ iommu_completion_wait(iommu);
+
+ return 0;
+}
+
+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);
@@ -3872,6 +3907,134 @@ static void free_irte(u16 devid, int index)
iommu_completion_wait(iommu);
}

+static void irte_prepare(void *entry,
+ u32 delivery_mode, u32 dest_mode,
+ u8 vector, u32 dest_apicid)
+{
+ union irte *irte = (union irte *) entry;
+
+ irte->val = 0;
+ irte->fields.vector = vector;
+ irte->fields.int_type = delivery_mode;
+ irte->fields.destination = dest_apicid;
+ irte->fields.dm = dest_mode;
+ irte->fields.valid = 1;
+}
+
+static void irte_ga_prepare(void *entry,
+ u32 delivery_mode, u32 dest_mode,
+ u8 vector, u32 dest_apicid)
+{
+ struct irte_ga *irte = (struct irte_ga *) entry;
+
+ irte->lo.val = 0;
+ irte->hi.val = 0;
+ irte->lo.fields_remap.guest_mode = 0;
+ irte->lo.fields_remap.int_type = delivery_mode;
+ irte->lo.fields_remap.dm = dest_mode;
+ irte->hi.fields.vector = vector;
+ irte->lo.fields_remap.destination = dest_apicid;
+ irte->lo.fields_remap.valid = 1;
+}
+
+static void irte_activate(void *entry, u16 devid, u16 index)
+{
+ union irte *irte = (union irte *) entry;
+
+ irte->fields.valid = 1;
+ modify_irte(devid, index, irte);
+}
+
+static void irte_ga_activate(void *entry, u16 devid, u16 index)
+{
+ struct irte_ga *irte = (struct irte_ga *) entry;
+
+ irte->lo.fields_remap.valid = 1;
+ modify_irte_ga(devid, index, irte);
+}
+
+static void irte_deactivate(void *entry, u16 devid, u16 index)
+{
+ union irte *irte = (union irte *) entry;
+
+ irte->fields.valid = 0;
+ modify_irte(devid, index, irte);
+}
+
+static void irte_ga_deactivate(void *entry, u16 devid, u16 index)
+{
+ struct irte_ga *irte = (struct irte_ga *) entry;
+
+ irte->lo.fields_remap.valid = 0;
+ modify_irte_ga(devid, index, irte);
+}
+
+static void irte_set_affinity(void *entry, u16 devid, u16 index,
+ u8 vector, u32 dest_apicid)
+{
+ union irte *irte = (union irte *) entry;
+
+ irte->fields.vector = vector;
+ irte->fields.destination = dest_apicid;
+ modify_irte(devid, index, irte);
+}
+
+static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
+ u8 vector, u32 dest_apicid)
+{
+ struct irte_ga *irte = (struct irte_ga *) entry;
+
+ irte->hi.fields.vector = vector;
+ irte->lo.fields_remap.destination = dest_apicid;
+ irte->lo.fields_remap.guest_mode = 0;
+ modify_irte_ga(devid, index, irte);
+}
+
+static void irte_set_allocated(struct irq_remap_table *table, int index)
+{
+ table->table[index] = IRTE_ALLOCATED;
+}
+
+static void irte_ga_set_allocated(struct irq_remap_table *table, int index)
+{
+ struct irte_ga *ptr = (struct irte_ga *)table->table;
+ struct irte_ga *irte = &ptr[index];
+
+ memset(&irte->lo.val, 0, sizeof(u64));
+ memset(&irte->hi.val, 0, sizeof(u64));
+ irte->hi.fields.vector = 0xff;
+}
+
+static bool irte_is_allocated(struct irq_remap_table *table, int index)
+{
+ union irte *ptr = (union irte *)table->table;
+ union irte *irte = &ptr[index];
+
+ return irte->val != 0;
+}
+
+static bool irte_ga_is_allocated(struct irq_remap_table *table, int index)
+{
+ struct irte_ga *ptr = (struct irte_ga *)table->table;
+ struct irte_ga *irte = &ptr[index];
+
+ return irte->hi.fields.vector != 0;
+}
+
+static void irte_clear_allocated(struct irq_remap_table *table, int index)
+{
+ table->table[index] = 0;
+}
+
+static void irte_ga_clear_allocated(struct irq_remap_table *table, int index)
+{
+ struct irte_ga *ptr = (struct irte_ga *)table->table;
+ struct irte_ga *irte = &ptr[index];
+
+ memset(&irte->lo.val, 0, sizeof(u64));
+ memset(&irte->hi.val, 0, sizeof(u64));
+}
+
static int get_devid(struct irq_alloc_info *info)
{
int devid = -1;
@@ -3999,6 +4162,26 @@ static void irq_remapping_prepare_irte(struct amd_ir_data *data,
}
}

+struct amd_irte_ops irte_32_ops = {
+ .prepare = irte_prepare,
+ .activate = irte_activate,
+ .deactivate = irte_deactivate,
+ .set_affinity = irte_set_affinity,
+ .set_allocated = irte_set_allocated,
+ .is_allocated = irte_is_allocated,
+ .clear_allocated = irte_clear_allocated,
+};
+
+struct amd_irte_ops irte_128_ops = {
+ .prepare = irte_ga_prepare,
+ .activate = irte_ga_activate,
+ .deactivate = irte_ga_deactivate,
+ .set_affinity = irte_ga_set_affinity,
+ .set_allocated = irte_ga_set_allocated,
+ .is_allocated = irte_ga_is_allocated,
+ .clear_allocated = irte_ga_clear_allocated,
+};
+
static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
@@ -4104,7 +4287,7 @@ static void irq_remapping_activate(struct irq_domain *domain,
struct amd_ir_data *data = irq_data->chip_data;
struct irq_2_irte *irte_info = &data->irq_2_irte;

- modify_irte(irte_info->devid, irte_info->index, data->irte_entry);
+ modify_irte(irte_info->devid, irte_info->index, &data->irte_entry);
}

static void irq_remapping_deactivate(struct irq_domain *domain,
@@ -4115,7 +4298,7 @@ static void irq_remapping_deactivate(struct irq_domain *domain,
union irte entry;

entry.val = 0;
- modify_irte(irte_info->devid, irte_info->index, data->irte_entry);
+ modify_irte(irte_info->devid, irte_info->index, &data->irte_entry);
}

static struct irq_domain_ops amd_ir_domain_ops = {
@@ -4144,7 +4327,7 @@ static int amd_ir_set_affinity(struct irq_data *data,
*/
ir_data->irte_entry.fields.vector = cfg->vector;
ir_data->irte_entry.fields.destination = cfg->dest_apicid;
- modify_irte(irte_info->devid, irte_info->index, ir_data->irte_entry);
+ modify_irte(irte_info->devid, irte_info->index, &ir_data->irte_entry);

/*
* After this point, all the interrupts will start arriving
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index d9227a9..cc59fc5 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -410,6 +410,7 @@ struct amd_iommu_fault {

struct iommu_domain;
struct irq_domain;
+struct amd_irte_ops;

/*
* This structure contains generic data for IOMMU protection domains
@@ -534,6 +535,8 @@ struct amd_iommu {
#ifdef CONFIG_IRQ_REMAP
struct irq_domain *ir_domain;
struct irq_domain *msi_domain;
+
+ struct amd_irte_ops *irte_ops;
#endif
};

@@ -776,12 +779,29 @@ struct irq_2_irte {
u16 index; /* Index into IRTE table*/
};

+struct amd_irte_ops {
+ void (*prepare)(void *, u32, u32, u8, u32);
+ void (*activate)(void *, u16, u16);
+ void (*deactivate)(void *, u16, u16);
+ void (*set_affinity)(void *, u16, u16, u8, u32);
+ void *(*get)(struct irq_remap_table *, int);
+ void (*set_allocated)(struct irq_remap_table *, int);
+ bool (*is_allocated)(struct irq_remap_table *, int);
+ void (*clear_allocated)(struct irq_remap_table *, int);
+};
+
struct amd_ir_data {
struct irq_2_irte irq_2_irte;
union irte irte_entry;
+ void *entry;
union {
struct msi_msg msi_entry;
};
};

+#ifdef CONFIG_IRQ_REMAP
+extern struct amd_irte_ops irte_32_ops;
+extern struct amd_irte_ops irte_128_ops;
+#endif
+
#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */
--
1.9.1