[patch V2 15/33] iommu/vt-d: Switch to MSI parent domains

Thomas Gleixner
2022-11-21T14:39:10Z

Remove the global PCI/MSI irqdomain implementation and provide the required
MSI parent ops so the PCI/MSI code can detect the new parent and setup per
device domains.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/msi.c | 2 ++
drivers/iommu/intel/iommu.h | 1 -
drivers/iommu/intel/irq_remapping.c | 27 ++++++++++++---------------
include/linux/irqdomain_defs.h | 1 +
4 files changed, 15 insertions(+), 16 deletions(-)

--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -217,6 +217,8 @@ static bool x86_init_dev_msi_info(struct
/* See msi_set_affinity() for the gory details */
info->flags |= MSI_FLAG_NOMASK_QUIRK;
break;
+ case DOMAIN_BUS_DMAR:
+ break;
default:
WARN_ON_ONCE(1);
return false;
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -600,7 +600,6 @@ struct intel_iommu {
#ifdef CONFIG_IRQ_REMAP
struct ir_table *ir_table; /* Interrupt remapping info */
struct irq_domain *ir_domain;
- struct irq_domain *ir_msi_domain;
#endif
struct iommu_device iommu; /* IOMMU core code handle */
int node;
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -82,6 +82,7 @@ static const struct irq_domain_ops intel

static void iommu_disable_irq_remapping(struct intel_iommu *iommu);
static int __init parse_ioapics_under_ir(void);
+static const struct msi_parent_ops dmar_msi_parent_ops;

static bool ir_pre_enabled(struct intel_iommu *iommu)
{
@@ -230,7 +231,7 @@ static struct irq_domain *map_dev_to_ir(
{
struct dmar_drhd_unit *drhd = dmar_find_matched_drhd_unit(dev);

- return drhd ? drhd->iommu->ir_msi_domain : NULL;
+ return drhd ? drhd->iommu->ir_domain : NULL;
}

static int clear_entries(struct irq_2_iommu *irq_iommu)
@@ -573,10 +574,10 @@ static int intel_setup_irq_remapping(str
pr_err("IR%d: failed to allocate irqdomain\n", iommu->seq_id);
goto out_free_fwnode;
}
- iommu->ir_msi_domain =
- arch_create_remap_msi_irq_domain(iommu->ir_domain,
- "INTEL-IR-MSI",
- iommu->seq_id);
+
+ irq_domain_update_bus_token(iommu->ir_domain, DOMAIN_BUS_DMAR);
+ iommu->ir_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
+ iommu->ir_domain->msi_parent_ops = &dmar_msi_parent_ops;

ir_table->base = page_address(pages);
ir_table->bitmap = bitmap;
@@ -620,9 +621,6 @@ static int intel_setup_irq_remapping(str
return 0;

out_free_ir_domain:
- if (iommu->ir_msi_domain)
- irq_domain_remove(iommu->ir_msi_domain);
- iommu->ir_msi_domain = NULL;
irq_domain_remove(iommu->ir_domain);
iommu->ir_domain = NULL;
out_free_fwnode:
@@ -644,13 +642,6 @@ static void intel_teardown_irq_remapping
struct fwnode_handle *fn;

if (iommu && iommu->ir_table) {
- if (iommu->ir_msi_domain) {
- fn = iommu->ir_msi_domain->fwnode;
-
- irq_domain_remove(iommu->ir_msi_domain);
- irq_domain_free_fwnode(fn);
- iommu->ir_msi_domain = NULL;
- }
if (iommu->ir_domain) {
fn = iommu->ir_domain->fwnode;

@@ -1437,6 +1428,12 @@ static const struct irq_domain_ops intel
.deactivate = intel_irq_remapping_deactivate,
};

+static const struct msi_parent_ops dmar_msi_parent_ops = {
+ .supported_flags = X86_VECTOR_MSI_FLAGS_SUPPORTED | MSI_FLAG_MULTI_PCI_MSI,
+ .prefix = "IR-",
+ .init_dev_msi_info = msi_parent_init_dev_msi_info,
+};
+
/*
* Support of Interrupt Remapping Unit Hotplug
*/
--- a/include/linux/irqdomain_defs.h
+++ b/include/linux/irqdomain_defs.h
@@ -23,6 +23,7 @@ enum irq_domain_bus_token {
DOMAIN_BUS_VMD_MSI,
DOMAIN_BUS_PCI_DEVICE_MSI,
DOMAIN_BUS_PCI_DEVICE_MSIX,
+ DOMAIN_BUS_DMAR,
};

#endif /* _LINUX_IRQDOMAIN_DEFS_H */