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Date: Tue, 21 Jul 2020 09:02:35 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: vkoul@...nel.org, megha.dey@...el.com, maz@...nel.org,
bhelgaas@...gle.com, rafael@...nel.org, gregkh@...uxfoundation.org,
tglx@...utronix.de, hpa@...or.com, alex.williamson@...hat.com,
jacob.jun.pan@...el.com, ashok.raj@...el.com, jgg@...lanox.com,
yi.l.liu@...el.com, baolu.lu@...el.com, kevin.tian@...el.com,
sanjay.k.kumar@...el.com, tony.luck@...el.com, jing.lin@...el.com,
dan.j.williams@...el.com, kwankhede@...dia.com,
eric.auger@...hat.com, parav@...lanox.com, jgg@...lanox.com,
rafael@...nel.org, dave.hansen@...el.com, netanelg@...lanox.com,
shahafs@...lanox.com, yan.y.zhao@...ux.intel.com,
pbonzini@...hat.com, samuel.ortiz@...el.com, mona.hossain@...el.com
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
x86@...nel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH RFC v2 03/18] irq/dev-msi: Create IR-DEV-MSI irq domain
From: Megha Dey <megha.dey@...el.com>
When DEV_MSI is enabled, the dev_msi_default_domain is updated to the
base DEV-MSI irq domain. If interrupt remapping is enabled, we create
a new IR-DEV-MSI irq domain and update the dev_msi_default domain to
the same.
For X86, introduce a new irq_alloc_type which will be used by the
interrupt remapping driver.
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Megha Dey <megha.dey@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
arch/x86/include/asm/hw_irq.h | 1 +
arch/x86/kernel/apic/msi.c | 12 ++++++
drivers/base/dev-msi.c | 66 +++++++++++++++++++++++++++++++----
drivers/iommu/intel/irq_remapping.c | 11 +++++-
include/linux/intel-iommu.h | 1 +
include/linux/irqdomain.h | 11 ++++++
include/linux/msi.h | 3 ++
7 files changed, 96 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 8ecd7570589d..bdddd63add41 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -40,6 +40,7 @@ enum irq_alloc_type {
X86_IRQ_ALLOC_TYPE_MSIX,
X86_IRQ_ALLOC_TYPE_DMAR,
X86_IRQ_ALLOC_TYPE_UV,
+ X86_IRQ_ALLOC_TYPE_DEV_MSI,
};
struct irq_alloc_info {
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 5cbaca58af95..8b25cadbae09 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -507,3 +507,15 @@ int hpet_assign_irq(struct irq_domain *domain, struct hpet_channel *hc,
return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, &info);
}
#endif
+
+#ifdef CONFIG_DEV_MSI
+int dev_msi_prepare(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg)
+{
+ memset(arg, 0, sizeof(*arg));
+
+ arg->type = X86_IRQ_ALLOC_TYPE_DEV_MSI;
+
+ return 0;
+}
+#endif
diff --git a/drivers/base/dev-msi.c b/drivers/base/dev-msi.c
index 240ccc353933..43d6ed3ba10f 100644
--- a/drivers/base/dev-msi.c
+++ b/drivers/base/dev-msi.c
@@ -5,6 +5,7 @@
* Author: Megha Dey <megha.dey@...el.com>
*/
+#include <linux/device.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
@@ -32,7 +33,7 @@ static void dev_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
arg->hwirq = dev_msi_calc_hwirq(desc);
}
-static int dev_msi_prepare(struct irq_domain *domain, struct device *dev,
+int __weak dev_msi_prepare(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *arg)
{
memset(arg, 0, sizeof(*arg));
@@ -81,15 +82,66 @@ static int __init create_dev_msi_domain(void)
if (!fn)
return -ENXIO;
- dev_msi_default_domain = msi_create_irq_domain(fn, &dev_msi_domain_info, parent);
+ /*
+ * This initcall may come after remap code is initialized. Ensure that
+ * dev_msi_default domain is updated correctly.
+ */
if (!dev_msi_default_domain) {
- pr_warn("failed to initialize irqdomain for DEV-MSI.\n");
- return -ENXIO;
+ dev_msi_default_domain = msi_create_irq_domain(fn, &dev_msi_domain_info, parent);
+ if (!dev_msi_default_domain) {
+ pr_warn("failed to initialize irqdomain for DEV-MSI.\n");
+ return -ENXIO;
+ }
+
+ irq_domain_update_bus_token(dev_msi_default_domain, DOMAIN_BUS_PLATFORM_MSI);
+ irq_domain_free_fwnode(fn);
}
- irq_domain_update_bus_token(dev_msi_default_domain, DOMAIN_BUS_PLATFORM_MSI);
- irq_domain_free_fwnode(fn);
-
return 0;
}
device_initcall(create_dev_msi_domain);
+
+#ifdef CONFIG_IRQ_REMAP
+static struct irq_chip dev_msi_ir_controller = {
+ .name = "IR-DEV-MSI",
+ .irq_unmask = platform_msi_unmask_irq,
+ .irq_mask = platform_msi_mask_irq,
+ .irq_write_msi_msg = platform_msi_write_msg,
+ .irq_ack = irq_chip_ack_parent,
+ .irq_retrigger = irq_chip_retrigger_hierarchy,
+ .irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
+ .flags = IRQCHIP_SKIP_SET_WAKE,
+};
+
+static struct msi_domain_info dev_msi_ir_domain_info = {
+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS,
+ .ops = &dev_msi_domain_ops,
+ .chip = &dev_msi_ir_controller,
+ .handler = handle_edge_irq,
+ .handler_name = "edge",
+};
+
+struct irq_domain *create_remap_dev_msi_irq_domain(struct irq_domain *parent,
+ const char *name)
+{
+ struct fwnode_handle *fn;
+ struct irq_domain *domain;
+
+ fn = irq_domain_alloc_named_fwnode(name);
+ if (!fn)
+ return NULL;
+
+ domain = msi_create_irq_domain(fn, &dev_msi_ir_domain_info, parent);
+ if (!domain) {
+ pr_warn("failed to initialize irqdomain for IR-DEV-MSI.\n");
+ return ERR_PTR(-ENXIO);
+ }
+
+ irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI);
+
+ if (!dev_msi_default_domain)
+ dev_msi_default_domain = domain;
+
+ return domain;
+}
+#endif
diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 7f8769800815..51872aabe5f8 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -573,6 +573,10 @@ static int intel_setup_irq_remapping(struct intel_iommu *iommu)
"INTEL-IR-MSI",
iommu->seq_id);
+ iommu->ir_dev_msi_domain =
+ create_remap_dev_msi_irq_domain(iommu->ir_domain,
+ "INTEL-IR-DEV-MSI");
+
ir_table->base = page_address(pages);
ir_table->bitmap = bitmap;
iommu->ir_table = ir_table;
@@ -1299,9 +1303,10 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
case X86_IRQ_ALLOC_TYPE_HPET:
case X86_IRQ_ALLOC_TYPE_MSI:
case X86_IRQ_ALLOC_TYPE_MSIX:
+ case X86_IRQ_ALLOC_TYPE_DEV_MSI:
if (info->type == X86_IRQ_ALLOC_TYPE_HPET)
set_hpet_sid(irte, info->hpet_id);
- else
+ else if (info->type != X86_IRQ_ALLOC_TYPE_DEV_MSI)
set_msi_sid(irte, info->msi_dev);
msg->address_hi = MSI_ADDR_BASE_HI;
@@ -1353,8 +1358,10 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain,
if (!info || !iommu)
return -EINVAL;
+
if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_MSI &&
- info->type != X86_IRQ_ALLOC_TYPE_MSIX)
+ info->type != X86_IRQ_ALLOC_TYPE_MSIX &&
+ info->type != X86_IRQ_ALLOC_TYPE_DEV_MSI)
return -EINVAL;
/*
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index d129baf7e0b8..3b868d1c43df 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -596,6 +596,7 @@ struct intel_iommu {
struct ir_table *ir_table; /* Interrupt remapping info */
struct irq_domain *ir_domain;
struct irq_domain *ir_msi_domain;
+ struct irq_domain *ir_dev_msi_domain;
#endif
struct iommu_device iommu; /* IOMMU core code handle */
int node;
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index b37350c4fe37..e537d7b50cee 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -589,6 +589,17 @@ irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain)
}
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
+#if defined(CONFIG_DEV_MSI) && defined(CONFIG_IRQ_REMAP)
+extern struct irq_domain *create_remap_dev_msi_irq_domain(struct irq_domain *parent,
+ const char *name);
+#else
+static inline struct irq_domain *create_remap_dev_msi_irq_domain(struct irq_domain *parent,
+ const char *name)
+{
+ return NULL;
+}
+#endif
+
#else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }
static inline struct irq_domain *irq_find_matching_fwnode(
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 1da97f905720..7098ba566bcd 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -378,6 +378,9 @@ void *platform_msi_get_host_data(struct irq_domain *domain);
void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg);
void platform_msi_unmask_irq(struct irq_data *data);
void platform_msi_mask_irq(struct irq_data *data);
+
+int dev_msi_prepare(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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