[xen staging] xen/riscv: introduce platform_get_irq()

[patchbot@xxxxxxx]

commit 8e8ffba487866fffd6e0fb4b52be316d61194089
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Jun 2 12:44:13 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 2 12:44:13 2025 +0200

    xen/riscv: introduce platform_get_irq()
    
    platform_get_irq() recieves information about device's irq ( type
    and irq number ) from device tree node and using this information
    update irq descriptor in irq_desc[] array.
    
    Introduce dt_irq_xlate and initialize with aplic_irq_xlate() as
    it is used by dt_device_get_irq() which is called by
    platform_get_irq().
    
    Co-developed-by: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/aplic.c           | 20 +++++++++++++++++
 xen/arch/riscv/include/asm/irq.h |  3 +++
 xen/arch/riscv/irq.c             | 47 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+)

diff --git a/xen/arch/riscv/aplic.c b/xen/arch/riscv/aplic.c
index caba8f8993..10ae81f7ac 100644
--- a/xen/arch/riscv/aplic.c
+++ b/xen/arch/riscv/aplic.c
@@ -11,6 +11,7 @@
 
 #include <xen/errno.h>
 #include <xen/init.h>
+#include <xen/irq.h>
 #include <xen/sections.h>
 #include <xen/types.h>
 
@@ -21,6 +22,23 @@ static struct intc_info __ro_after_init aplic_info = {
     .hw_version = INTC_APLIC,
 };
 
+static int cf_check aplic_irq_xlate(const uint32_t *intspec,
+                                    unsigned int intsize,
+                                    unsigned int *out_hwirq,
+                                    unsigned int *out_type)
+{
+    if ( intsize < 2 )
+        return -EINVAL;
+
+    /* Mapping 1:1 */
+    *out_hwirq = intspec[0];
+
+    if ( out_type )
+        *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+
+    return 0;
+}
+
 static int __init aplic_preinit(struct dt_device_node *node, const void *dat)
 {
     if ( aplic_info.node )
@@ -35,6 +53,8 @@ static int __init aplic_preinit(struct dt_device_node *node, 
const void *dat)
 
     aplic_info.node = node;
 
+    dt_irq_xlate = aplic_irq_xlate;
+
     return 0;
 }
 
diff --git a/xen/arch/riscv/include/asm/irq.h b/xen/arch/riscv/include/asm/irq.h
index ea555afd1a..84c3c2904d 100644
--- a/xen/arch/riscv/include/asm/irq.h
+++ b/xen/arch/riscv/include/asm/irq.h
@@ -38,6 +38,9 @@ static inline void arch_move_irqs(struct vcpu *v)
     BUG_ON("unimplemented");
 }
 
+struct dt_device_node;
+int platform_get_irq(const struct dt_device_node *device, int index);
+
 void init_IRQ(void);
 
 #endif /* ASM__RISCV__IRQ_H */
diff --git a/xen/arch/riscv/irq.c b/xen/arch/riscv/irq.c
index b5ae7a114b..669ef3ae9e 100644
--- a/xen/arch/riscv/irq.c
+++ b/xen/arch/riscv/irq.c
@@ -7,11 +7,58 @@
  */
 
 #include <xen/bug.h>
+#include <xen/device_tree.h>
+#include <xen/errno.h>
 #include <xen/init.h>
 #include <xen/irq.h>
 
 static irq_desc_t irq_desc[NR_IRQS];
 
+static bool irq_validate_new_type(unsigned int curr, unsigned int new)
+{
+    return curr == IRQ_TYPE_INVALID || curr == new;
+}
+
+static int irq_set_type(unsigned int irq, unsigned int type)
+{
+    unsigned long flags;
+    struct irq_desc *desc = irq_to_desc(irq);
+    int ret = -EBUSY;
+
+    spin_lock_irqsave(&desc->lock, flags);
+
+    if ( !irq_validate_new_type(desc->arch.type, type) )
+        goto err;
+
+    desc->arch.type = type;
+
+    ret = 0;
+
+ err:
+    spin_unlock_irqrestore(&desc->lock, flags);
+
+    return ret;
+}
+
+int platform_get_irq(const struct dt_device_node *device, int index)
+{
+    struct dt_irq dt_irq;
+    int ret;
+
+    if ( (ret = dt_device_get_irq(device, index, &dt_irq)) != 0 )
+        return ret;
+
+    BUILD_BUG_ON(NR_IRQS > INT_MAX);
+
+    if ( dt_irq.irq >= NR_IRQS )
+        panic("irq%d is bigger then NR_IRQS(%d)\n", dt_irq.irq, NR_IRQS);
+
+    if ( (ret = irq_set_type(dt_irq.irq, dt_irq.type)) != 0 )
+        return ret;
+
+    return dt_irq.irq;
+}
+
 int arch_init_one_irq_desc(struct irq_desc *desc)
 {
     desc->arch.type = IRQ_TYPE_INVALID;
--
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