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Message-Id: <20231219174526.2235150-12-sunilvl@ventanamicro.com>
Date: Tue, 19 Dec 2023 23:15:20 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org,
linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Anup Patel <anup@...infault.org>,
Thomas Gleixner <tglx@...utronix.de>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Haibo Xu <haibo1.xu@...el.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Andrew Jones <ajones@...tanamicro.com>,
Björn Töpel <bjorn@...nel.org>,
Marc Zyngier <maz@...nel.org>,
Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v3 11/17] irqchip: riscv-aplic: Add ACPI support
Add ACPI support in APLIC drivers. In ACPI, IO devices use Global System
Interrupts (GSI) which is a flat space split across multiple APLICs.
Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
arch/riscv/include/asm/irq.h | 6 +++
drivers/irqchip/irq-riscv-aplic-direct.c | 21 +++++---
drivers/irqchip/irq-riscv-aplic-main.c | 64 ++++++++++++++----------
drivers/irqchip/irq-riscv-aplic-main.h | 1 +
drivers/irqchip/irq-riscv-aplic-msi.c | 9 +++-
5 files changed, 66 insertions(+), 35 deletions(-)
diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
index 232314e5f007..df59192a157d 100644
--- a/arch/riscv/include/asm/irq.h
+++ b/arch/riscv/include/asm/irq.h
@@ -22,6 +22,12 @@
#define APLIC_PLIC_ID(x) ((x) >> 24)
#define IDC_CONTEXT_ID(x) ((x) & 0x0000ffff)
+#ifdef CONFIG_RISCV_APLIC
+struct fwnode_handle *aplic_get_gsi_domain_id(u32 gsi);
+#else
+static inline struct fwnode_handle *aplic_get_gsi_domain_id(u32 gsi) { return NULL; }
+#endif
+
int __init acpi_get_intc_index_hartid(u32 index, unsigned long *hartid);
int acpi_get_ext_intc_parent_hartid(u8 id, u32 idx, unsigned long *hartid);
void acpi_get_plic_nr_contexts(u8 id, int *nr_contexts);
diff --git a/drivers/irqchip/irq-riscv-aplic-direct.c b/drivers/irqchip/irq-riscv-aplic-direct.c
index 9ed2666bfb5e..3e7a7e092120 100644
--- a/drivers/irqchip/irq-riscv-aplic-direct.c
+++ b/drivers/irqchip/irq-riscv-aplic-direct.c
@@ -4,6 +4,7 @@
* Copyright (C) 2022 Ventana Micro Systems Inc.
*/
+#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
@@ -14,6 +15,7 @@
#include <linux/of_address.h>
#include <linux/printk.h>
#include <linux/smp.h>
+#include <asm/acpi.h>
#include "irq-riscv-aplic-main.h"
@@ -203,17 +205,20 @@ static int aplic_direct_starting_cpu(unsigned int cpu)
static int aplic_direct_parse_parent_hwirq(struct device *dev,
u32 index, u32 *parent_hwirq,
- unsigned long *parent_hartid)
+ unsigned long *parent_hartid,
+ struct aplic_priv *priv)
{
struct of_phandle_args parent;
int rc;
- /*
- * Currently, only OF fwnode is supported so extend this
- * function for ACPI support.
- */
- if (!is_of_node(dev->fwnode))
- return -EINVAL;
+ if (!is_of_node(dev->fwnode)) {
+ rc = acpi_get_ext_intc_parent_hartid(priv->id, index, parent_hartid);
+ if (rc)
+ return rc;
+
+ *parent_hwirq = RV_IRQ_EXT;
+ return 0;
+ }
rc = of_irq_parse_one(to_of_node(dev->fwnode), index, &parent);
if (rc)
@@ -251,7 +256,7 @@ int aplic_direct_setup(struct device *dev, void __iomem *regs)
/* Setup per-CPU IDC and target CPU mask */
for (i = 0; i < priv->nr_idcs; i++) {
- rc = aplic_direct_parse_parent_hwirq(dev, i, &hwirq, &hartid);
+ rc = aplic_direct_parse_parent_hwirq(dev, i, &hwirq, &hartid, priv);
if (rc) {
dev_warn(dev, "parent irq for IDC%d not found\n", i);
continue;
diff --git a/drivers/irqchip/irq-riscv-aplic-main.c b/drivers/irqchip/irq-riscv-aplic-main.c
index d1b342b66551..31434b3ff690 100644
--- a/drivers/irqchip/irq-riscv-aplic-main.c
+++ b/drivers/irqchip/irq-riscv-aplic-main.c
@@ -4,12 +4,15 @@
* Copyright (C) 2022 Ventana Micro Systems Inc.
*/
+#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/printk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/irqchip/riscv-aplic.h>
+#include <linux/irqchip/riscv-imsic.h>
+#include <asm/acpi.h>
#include "irq-riscv-aplic-main.h"
@@ -137,38 +140,44 @@ int aplic_setup_priv(struct aplic_priv *priv, struct device *dev,
void __iomem *regs)
{
struct of_phandle_args parent;
+ struct acpi_madt_aplic *aplic;
int rc;
- /*
- * Currently, only OF fwnode is supported so extend this
- * function for ACPI support.
- */
- if (!is_of_node(dev->fwnode))
- return -EINVAL;
-
/* Save device pointer and register base */
priv->dev = dev;
priv->regs = regs;
- /* Find out number of interrupt sources */
- rc = of_property_read_u32(to_of_node(dev->fwnode),
- "riscv,num-sources",
- &priv->nr_irqs);
- if (rc) {
- dev_err(dev, "failed to get number of interrupt sources\n");
- return rc;
- }
-
- /*
- * Find out number of IDCs based on parent interrupts
- *
- * If "msi-parent" property is present then we ignore the
- * APLIC IDCs which forces the APLIC driver to use MSI mode.
- */
- if (!of_property_present(to_of_node(dev->fwnode), "msi-parent")) {
- while (!of_irq_parse_one(to_of_node(dev->fwnode),
- priv->nr_idcs, &parent))
- priv->nr_idcs++;
+ if (is_of_node(dev->fwnode)) {
+ /* Find out number of interrupt sources */
+ rc = of_property_read_u32(to_of_node(dev->fwnode),
+ "riscv,num-sources",
+ &priv->nr_irqs);
+ if (rc) {
+ dev_err(dev, "failed to get number of interrupt sources\n");
+ return rc;
+ }
+
+ /*
+ * Find out number of IDCs based on parent interrupts
+ *
+ * If "msi-parent" property is present then we ignore the
+ * APLIC IDCs which forces the APLIC driver to use MSI mode.
+ */
+ if (!of_property_present(to_of_node(dev->fwnode), "msi-parent")) {
+ while (!of_irq_parse_one(to_of_node(dev->fwnode),
+ priv->nr_idcs, &parent))
+ priv->nr_idcs++;
+ }
+ } else {
+ aplic = *(struct acpi_madt_aplic **)dev_get_platdata(dev);
+ if (!aplic) {
+ dev_err(dev, "APLIC platform data is NULL!\n");
+ return -1;
+ }
+ priv->gsi_base = aplic->gsi_base;
+ priv->nr_irqs = aplic->num_sources;
+ priv->nr_idcs = aplic->num_idcs;
+ priv->id = aplic->id;
}
/* Setup initial state APLIC interrupts */
@@ -204,6 +213,9 @@ static int aplic_probe(struct platform_device *pdev)
if (is_of_node(dev->fwnode))
msi_mode = of_property_present(to_of_node(dev->fwnode),
"msi-parent");
+ else
+ msi_mode = imsic_acpi_get_fwnode(NULL) ? 1 : 0;
+
if (msi_mode)
rc = aplic_msi_setup(dev, regs);
else
diff --git a/drivers/irqchip/irq-riscv-aplic-main.h b/drivers/irqchip/irq-riscv-aplic-main.h
index 78267ec58098..dc022e89bc97 100644
--- a/drivers/irqchip/irq-riscv-aplic-main.h
+++ b/drivers/irqchip/irq-riscv-aplic-main.h
@@ -28,6 +28,7 @@ struct aplic_priv {
u32 gsi_base;
u32 nr_irqs;
u32 nr_idcs;
+ u32 id;
void __iomem *regs;
struct aplic_msicfg msicfg;
};
diff --git a/drivers/irqchip/irq-riscv-aplic-msi.c b/drivers/irqchip/irq-riscv-aplic-msi.c
index 086d00e0429e..03a8ac6554c4 100644
--- a/drivers/irqchip/irq-riscv-aplic-msi.c
+++ b/drivers/irqchip/irq-riscv-aplic-msi.c
@@ -178,6 +178,7 @@ static void aplic_msi_write_msg(struct msi_desc *desc, struct msi_msg *msg)
int aplic_msi_setup(struct device *dev, void __iomem *regs)
{
const struct imsic_global_config *imsic_global;
+ struct irq_domain *msi_domain;
struct irq_domain *irqdomain;
struct aplic_priv *priv;
struct aplic_msicfg *mc;
@@ -261,8 +262,14 @@ int aplic_msi_setup(struct device *dev, void __iomem *regs)
* IMSIC and the IMSIC MSI domains are created later through
* the platform driver probing so we set it explicitly here.
*/
- if (is_of_node(dev->fwnode))
+ if (is_of_node(dev->fwnode)) {
of_msi_configure(dev, to_of_node(dev->fwnode));
+ } else {
+ msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),
+ DOMAIN_BUS_PLATFORM_MSI);
+ if (msi_domain)
+ dev_set_msi_domain(dev, msi_domain);
+ }
}
/* Create irq domain instance for the APLIC MSI-mode */
--
2.39.2
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