lib: utils/irqchip: Add IDC to hartindex map in struct aplic_data

A platform can have multiple APLICs in direct-mode targetting
different subset of harts. Add APLIC ID to hartindex map in
struct aplic_data to capture the set of harts targeted by a
given APLIC in direct-mode.

Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260213055342.3124872-5-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>

1 files changed, 53 insertions, 1 deletions

diff --git a/lib/utils/irqchip/fdt_irqchip_aplic.c b/lib/utils/irqchip/fdt_irqchip_aplic.c
index 81ebe67d..4d7b1e77 100644
--- a/lib/utils/irqchip/fdt_irqchip_aplic.c
+++ b/lib/utils/irqchip/fdt_irqchip_aplic.c
@@ -16,6 +16,43 @@
 #include <sbi_utils/irqchip/fdt_irqchip.h>
 #include <sbi_utils/irqchip/aplic.h>
 
+static int irqchip_aplic_update_idc_map(const void *fdt, int nodeoff,
+					struct aplic_data *pd)
+{
+	int i, err, count, cpu_offset, cpu_intc_offset;
+	u32 phandle, hartid, hartindex;
+	const fdt32_t *val;
+
+	val = fdt_getprop(fdt, nodeoff, "interrupts-extended", &count);
+	if (!val || count < sizeof(fdt32_t))
+		return SBI_EINVAL;
+	count = count / sizeof(fdt32_t);
+
+	for (i = 0; i < count; i += 2) {
+		phandle = fdt32_to_cpu(val[i]);
+
+		cpu_intc_offset = fdt_node_offset_by_phandle(fdt, phandle);
+		if (cpu_intc_offset < 0)
+			continue;
+
+		cpu_offset = fdt_parent_offset(fdt, cpu_intc_offset);
+		if (cpu_offset < 0)
+			continue;
+
+		err = fdt_parse_hart_id(fdt, cpu_offset, &hartid);
+		if (err)
+			continue;
+
+		hartindex = sbi_hartid_to_hartindex(hartid);
+		if (hartindex == -1U)
+			continue;
+
+		pd->idc_map[i / 2] = hartindex;
+	}
+
+	return 0;
+}
+
 static int irqchip_aplic_cold_init(const void *fdt, int nodeoff,
 				   const struct fdt_match *match)
 {
@@ -30,12 +67,27 @@ static int irqchip_aplic_cold_init(const void *fdt, int nodeoff,
 	if (rc)
 		goto fail_free_data;
 
+	if (pd->num_idc) {
+		pd->idc_map = sbi_zalloc(sizeof(*pd->idc_map) * pd->num_idc);
+		if (!pd->idc_map) {
+			rc = SBI_ENOMEM;
+			goto fail_free_data;
+		}
+
+		rc = irqchip_aplic_update_idc_map(fdt, nodeoff, pd);
+		if (rc)
+			goto fail_free_idc_map;
+	}
+
 	rc = aplic_cold_irqchip_init(pd);
 	if (rc)
-		goto fail_free_data;
+		goto fail_free_idc_map;
 
 	return 0;
 
+fail_free_idc_map:
+	if (pd->num_idc)
+		sbi_free(pd->idc_map);
 fail_free_data:
 	sbi_free(pd);
 	return rc;