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[PATCH v5 0/5] gicv2m: acpi: Add ACPI support for GICv2m MSI

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  [PATCH v5 0/5] gicv2m: acpi: Add ACPI support for GICv2m MSI Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-09 02:50 +0100
    [PATCH v5 2/5] irqdomain: introduce is_fwnode_irqchip helper Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-09 03:00 +0100
      Re: [PATCH v5 2/5] irqdomain: introduce is_fwnode_irqchip helper Marc Zyngier <marc.zyngier@arm.com> - 2015-12-09 11:20 +0100
    [PATCH v5 3/5] irqdomain: Introduce irq_domain_get_irqchip_fwnode_name helper function Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-09 03:00 +0100
    [PATCH v5 4/5] gicv2m: Refactor to prepare for ACPI support Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> - 2015-12-09 03:00 +0100
      Re: [PATCH v5 4/5] gicv2m: Refactor to prepare for ACPI support Marc Zyngier <marc.zyngier@arm.com> - 2015-12-09 11:30 +0100

#1286973 — [PATCH v5 0/5] gicv2m: acpi: Add ACPI support for GICv2m MSI

This patch series has been forked from the following patch series since
it no longer depends on the rest of the patches.

  [PATCH v4 00/10] ACPI GIC Self-probing, GICv2m and GICv3 support
  https://lkml.org/lkml/2015/7/29/234

It has been ported to use the newly introduced device fwnode_handle 
for ACPI irqdmain introduced by Marc in the following patch series:

  [PATCH v2 00/17] Divorcing irqdomain and device_node
  http://git.kernel.org/cgit/linux/kernel/git/maz/arm-platforms.git irq/irq-domain-fwnode-v2

The following git branch contains the submitted patches along with
the pre-requsite patches (mainly for ARM64 PCI support for ACPI).

  https://github.com/ssuthiku/linux.git	v2m-multiframe-v5

This has been tested on AMD Seattle (Overdrive) RevB system. 

NOTE: I have not tested ACPI GICv2m multiframe support since
I don't have access to such system. Any helps are appreciated.

Thanks,
Suravee

Changes from V4: (https://lkml.org/lkml/2015/12/08/613)
  - Fix build error when not specifying CONFIG_IRQ_DOMAIN.

Changes from V3: (https://lkml.org/lkml/2015/10/21/691)
  - Merged patch 2 into 1, and got rid off pci_msi_get_fwnode()
    since only ACPI will likely use this. (per Marc suggestion)
  - Rebased to 4.4.0-rc4

Changes from V2: (https://lkml.org/lkml/2015/10/14/1010)
  - Minor clean up from Tomasz review comment in patch 6/6.

Changes from V1: (https://lkml.org/lkml/2015/10/13/859)
  - Rebase on top of Marc's patch to addng support for multiple MSI frames
    (https://lkml.org/lkml/2015/10/14/271)
  - Adding fwnode convenient functions (patch 3 and 4)

Suravee Suthikulpanit (5):
  acpi: pci: Setup MSI domain for ACPI based pci devices
  irqdomain: introduce is_fwnode_irqchip helper
  irqdomain: Introduce irq_domain_get_irqchip_fwnode_name helper
    function
  gicv2m: Refactor to prepare for ACPI support
  gicv2m: acpi: Introducing GICv2m ACPI support

 drivers/irqchip/irq-gic-v2m.c   | 152 ++++++++++++++++++++++++++++++++++------
 drivers/irqchip/irq-gic.c       |   5 +-
 drivers/pci/pci-acpi.c          |  32 +++++++++
 drivers/pci/probe.c             |   2 +
 include/linux/irqchip/arm-gic.h |   4 ++
 include/linux/irqdomain.h       |  11 +++
 include/linux/pci.h             |  10 +++
 kernel/irq/irqdomain.c          |  20 +++++-
 8 files changed, 213 insertions(+), 23 deletions(-)

-- 
2.1.0

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#1286974 — [PATCH v5 2/5] irqdomain: introduce is_fwnode_irqchip helper

Since there will be several places checking if fwnode.type
is equal FWNODE_IRQCHIP, this patch adds a convenient function
for this purpose.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
---
 drivers/irqchip/irq-gic.c | 2 +-
 include/linux/irqdomain.h | 5 +++++
 kernel/irq/irqdomain.c    | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index abf2ffa..fcd327f 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -972,7 +972,7 @@ static int gic_irq_domain_translate(struct irq_domain *d,
 		return 0;
 	}
 
-	if (fwspec->fwnode->type == FWNODE_IRQCHIP) {
+	if (is_fwnode_irqchip(fwspec->fwnode)) {
 		if(fwspec->param_count != 2)
 			return -EINVAL;
 
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index a06feda..d72fabc 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -211,6 +211,11 @@ static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
 	return node ? &node->fwnode : NULL;
 }
 
+static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
+{
+	return fwnode && fwnode->type == FWNODE_IRQCHIP;
+}
+
 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
 							enum irq_domain_bus_token bus_token)
 {
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 22aa961..7f34d98 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -70,7 +70,7 @@ void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 {
 	struct irqchip_fwid *fwid;
 
-	if (WARN_ON(fwnode->type != FWNODE_IRQCHIP))
+	if (WARN_ON(!is_fwnode_irqchip(fwnode)))
 		return;
 
 	fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
-- 
2.1.0

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#1287353 — Re: [PATCH v5 2/5] irqdomain: introduce is_fwnode_irqchip helper

On Tue, 8 Dec 2015 17:48:03 -0800
Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> wrote:

> Since there will be several places checking if fwnode.type
> is equal FWNODE_IRQCHIP, this patch adds a convenient function
> for this purpose.
> 
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

Acked-by: Marc Zyngier <marc.zyngier@arm.com>

	M.
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#1286976 — [PATCH v5 3/5] irqdomain: Introduce irq_domain_get_irqchip_fwnode_name helper function

This patch adds an accessor function to retrieve struct irqchip_fwid.name.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
---
 include/linux/irqdomain.h |  1 +
 kernel/irq/irqdomain.c    | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index d72fabc..c0a95a9 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -187,6 +187,7 @@ static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
 #ifdef CONFIG_IRQ_DOMAIN
 struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
+const char *irq_domain_get_irqchip_fwnode_name(struct fwnode_handle *fwnode);
 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 				    irq_hw_number_t hwirq_max, int direct_max,
 				    const struct irq_domain_ops *ops,
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 7f34d98..a8c1cf6 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -79,6 +79,24 @@ void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 }
 
 /**
+ * irq_domain_get_irqchip_fwnode_name - Retrieve associated name of
+ *                                      specified irqchip fwnode
+ * @fwnode: Specified fwnode_handle
+ *
+ * Returns associated name of the specified fwnode, or NULL on failure.
+ */
+const char *irq_domain_get_irqchip_fwnode_name(struct fwnode_handle *fwnode)
+{
+	struct irqchip_fwid *fwid;
+
+	if (!is_fwnode_irqchip(fwnode))
+		return NULL;
+
+	fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
+	return fwid->name;
+}
+
+/**
  * __irq_domain_add() - Allocate a new irq_domain data structure
  * @of_node: optional device-tree node of the interrupt controller
  * @size: Size of linear map; 0 for radix mapping only
-- 
2.1.0

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#1286977 — [PATCH v5 4/5] gicv2m: Refactor to prepare for ACPI support

This patch replaces the struct device_node with struct fwnode_handle
since this structure is common between DT and ACPI.

It also refactors gicv2m_init_one() to prepare for ACPI support.
There should be no functional changes.

Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
---
 drivers/irqchip/irq-gic-v2m.c | 57 +++++++++++++++++++++++++++----------------
 1 file changed, 36 insertions(+), 21 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 87f8d10..7e60f7e 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -55,7 +55,7 @@ static DEFINE_SPINLOCK(v2m_lock);
 
 struct v2m_data {
 	struct list_head entry;
-	struct device_node *node;
+	struct fwnode_handle *fwnode;
 	struct resource res;	/* GICv2m resource */
 	void __iomem *base;	/* GICv2m virt address */
 	u32 spi_start;		/* The SPI number that MSIs start */
@@ -254,7 +254,7 @@ static void gicv2m_teardown(void)
 		list_del(&v2m->entry);
 		kfree(v2m->bm);
 		iounmap(v2m->base);
-		of_node_put(v2m->node);
+		of_node_put(to_of_node(v2m->fwnode));
 		kfree(v2m);
 	}
 }
@@ -268,7 +268,7 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 	if (!v2m)
 		return 0;
 
-	inner_domain = irq_domain_create_tree(of_node_to_fwnode(v2m->node),
+	inner_domain = irq_domain_create_tree(v2m->fwnode,
 					      &gicv2m_domain_ops, v2m);
 	if (!inner_domain) {
 		pr_err("Failed to create GICv2m domain\n");
@@ -277,10 +277,10 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 
 	inner_domain->bus_token = DOMAIN_BUS_NEXUS;
 	inner_domain->parent = parent;
-	pci_domain = pci_msi_create_irq_domain(of_node_to_fwnode(v2m->node),
+	pci_domain = pci_msi_create_irq_domain(v2m->fwnode,
 					       &gicv2m_msi_domain_info,
 					       inner_domain);
-	plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(v2m->node),
+	plat_domain = platform_msi_create_irq_domain(v2m->fwnode,
 						     &gicv2m_pmsi_domain_info,
 						     inner_domain);
 	if (!pci_domain || !plat_domain) {
@@ -296,11 +296,13 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 	return 0;
 }
 
-static int __init gicv2m_init_one(struct device_node *node,
-				  struct irq_domain *parent)
+static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
+				  u32 spi_start, u32 nr_spis,
+				  struct resource *res)
 {
 	int ret;
 	struct v2m_data *v2m;
+	const char *name = NULL;
 
 	v2m = kzalloc(sizeof(struct v2m_data), GFP_KERNEL);
 	if (!v2m) {
@@ -309,13 +311,9 @@ static int __init gicv2m_init_one(struct device_node *node,
 	}
 
 	INIT_LIST_HEAD(&v2m->entry);
-	v2m->node = node;
+	v2m->fwnode = fwnode;
 
-	ret = of_address_to_resource(node, 0, &v2m->res);
-	if (ret) {
-		pr_err("Failed to allocate v2m resource.\n");
-		goto err_free_v2m;
-	}
+	memcpy(&v2m->res, res, sizeof(struct resource));
 
 	v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
 	if (!v2m->base) {
@@ -324,10 +322,9 @@ static int __init gicv2m_init_one(struct device_node *node,
 		goto err_free_v2m;
 	}
 
-	if (!of_property_read_u32(node, "arm,msi-base-spi", &v2m->spi_start) &&
-	    !of_property_read_u32(node, "arm,msi-num-spis", &v2m->nr_spis)) {
-		pr_info("Overriding V2M MSI_TYPER (base:%u, num:%u)\n",
-			v2m->spi_start, v2m->nr_spis);
+	if (spi_start && nr_spis) {
+		v2m->spi_start = spi_start;
+		v2m->nr_spis = nr_spis;
 	} else {
 		u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER);
 
@@ -359,10 +356,13 @@ static int __init gicv2m_init_one(struct device_node *node,
 	}
 
 	list_add_tail(&v2m->entry, &v2m_nodes);
-	pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", node->name,
-		(unsigned long)v2m->res.start, (unsigned long)v2m->res.end,
-		v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
 
+	if (to_of_node(fwnode))
+		name = to_of_node(fwnode)->name;
+
+	pr_info("Frame %s: range[%#lx:%#lx], SPI[%d:%d]\n", name,
+		(unsigned long)res->start, (unsigned long)res->end,
+		v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
 	return 0;
 
 err_iounmap:
@@ -384,10 +384,25 @@ int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
 
 	for (child = of_find_matching_node(node, gicv2m_device_id); child;
 	     child = of_find_matching_node(child, gicv2m_device_id)) {
+		u32 spi_start = 0, nr_spis = 0;
+		struct resource res;
+
 		if (!of_find_property(child, "msi-controller", NULL))
 			continue;
 
-		ret = gicv2m_init_one(child, parent);
+		ret = of_address_to_resource(child, 0, &res);
+		if (ret) {
+			pr_err("Failed to allocate v2m resource.\n");
+			break;
+		}
+
+		if (!of_property_read_u32(child, "arm,msi-base-spi",
+					  &spi_start) &&
+		    !of_property_read_u32(child, "arm,msi-num-spis", &nr_spis))
+			pr_info("DT overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+				spi_start, nr_spis);
+
+		ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis, &res);
 		if (ret) {
 			of_node_put(node);
 			break;
-- 
2.1.0

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#1287373 — Re: [PATCH v5 4/5] gicv2m: Refactor to prepare for ACPI support

On Tue, 8 Dec 2015 17:48:05 -0800
Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> wrote:

> This patch replaces the struct device_node with struct fwnode_handle
> since this structure is common between DT and ACPI.
> 
> It also refactors gicv2m_init_one() to prepare for ACPI support.
> There should be no functional changes.
> 
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

	M.
-- 
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