diff mbox

[08/32] xive: Add CPU node "interrupts" properties representing the IPIs

Message ID 1479780814-6162-8-git-send-email-benh@kernel.crashing.org
State Superseded
Headers show

Commit Message

Benjamin Herrenschmidt Nov. 22, 2016, 2:13 a.m. UTC 
This will be used in exploitation mode to request the IPIs for
the various threads. Each core node has an "interrupts" property
of the standard format for each thread of that core.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 hw/xive.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
diff mbox

Patch

diff --git a/hw/xive.c b/hw/xive.c
index 980333b..395cb44 100644
--- a/hw/xive.c
+++ b/hw/xive.c
@@ -1979,6 +1979,26 @@  static void xive_init_cpu(struct cpu_thread *c)
 	xive_cpu_dbg(c, "CPU IPI is irq %08x\n", xs->ipi_irq);
 }
 
+static void xive_init_cpu_properties(struct cpu_thread *cpu)
+{
+	struct cpu_thread *t;
+	uint32_t iprop[8][2] = { };
+	uint32_t i;
+
+	assert(cpu_thread_count <= 8);
+
+	if (!cpu->node)
+		return;
+	for (i = 0; i < cpu_thread_count; i++) {
+		t = (i == 0) ? cpu : find_cpu_by_pir(cpu->pir + i);
+		if (!t)
+			continue;
+		iprop[i][0] = t->xstate->ipi_irq;
+		iprop[i][1] = 0; /* Edge */
+	}
+	dt_add_property(cpu->node, "interrupts", iprop, cpu_thread_count * 8);
+	dt_add_property_cells(cpu->node, "interrupt-parent", get_ics_phandle());
+}
 
 static uint32_t xive_read_eq(struct xive_cpu_state *xs, bool just_peek)
 {
@@ -2326,6 +2346,11 @@  void init_xive(void)
 	for_each_cpu(cpu) {
 		xive_init_cpu(cpu);
 	}
+	/* Add interrupts propertie to each CPU node */
+	for_each_cpu(cpu) {
+		if (cpu_is_thread0(cpu))
+			xive_init_cpu_properties(cpu);
+	}
 
 	/* Calling boot CPU */
 	xive_cpu_callin(this_cpu());