diff mbox series

[v5,04/10] cpu: Keep track of the "ec_primary" in big core more

Message ID 20200422050419.72957-5-svaidy@linux.ibm.com
State New
Headers show
Series Initial fused-core support for POWER9 | expand

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Context Check Description
snowpatch_ozlabs/snowpatch_job_snowpatch-skiboot-dco success Signed-off-by present
snowpatch_ozlabs/snowpatch_job_snowpatch-skiboot success Test snowpatch/job/snowpatch-skiboot on branch master
snowpatch_ozlabs/apply_patch success Successfully applied on branch master (9547b3da44d546f0083dd3aeb5436226fccf81e3)

Commit Message

Vaidyanathan Srinivasan April 22, 2020, 5:04 a.m. UTC
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

The "EC" primary is the primary thread of an EC, ie, the corresponding
small core "half" of the big core where the thread resides.

It will be necessary for the direct controls to target the right
half when doing special wakeups among others.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
---
 core/cpu.c    | 20 ++++++++++++++------
 include/cpu.h |  1 +
 2 files changed, 15 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/core/cpu.c b/core/cpu.c
index d174e322..88d0b886 100644
--- a/core/cpu.c
+++ b/core/cpu.c
@@ -823,9 +823,11 @@  struct cpu_thread *first_ungarded_cpu(void)
 
 struct cpu_thread *next_ungarded_primary(struct cpu_thread *cpu)
 {
+	bool is_primary;
 	do {
 		cpu = next_cpu(cpu);
-	} while(cpu && (cpu->state == cpu_state_unavailable || cpu->primary != cpu));
+		is_primary = cpu == cpu->primary || cpu == cpu->ec_primary;
+	} while(cpu && (cpu->state == cpu_state_unavailable || !is_primary));
 
 	return cpu;
 }
@@ -1165,7 +1167,7 @@  void init_all_cpus(void)
 		unsigned int pir, server_no, chip_id, threads;
 		enum cpu_thread_state state;
 		const struct dt_property *p;
-		struct cpu_thread *t, *pt;
+		struct cpu_thread *t, *pt0, *pt1;
 
 		/* Skip cache nodes */
 		if (strcmp(dt_prop_get(cpu, "device_type"), "cpu"))
@@ -1200,14 +1202,18 @@  void init_all_cpus(void)
 
 		/* Setup thread 0 */
 		assert(pir <= cpu_max_pir);
-		t = pt = &cpu_stacks[pir].cpu;
+		t = pt0 = &cpu_stacks[pir].cpu;
 		if (t != boot_cpu) {
 			init_cpu_thread(t, state, pir);
 			/* Each cpu gets its own later in init_trace_buffers */
 			t->trace = boot_cpu->trace;
 		}
+		if (t->is_fused_core)
+			pt1 = &cpu_stacks[pir + 1].cpu;
+		else
+			pt1 = pt0;
 		t->server_no = server_no;
-		t->primary = t;
+		t->primary = t->ec_primary = t;
 		t->node = cpu;
 		t->chip_id = chip_id;
 		t->icp_regs = NULL; /* Will be set later */
@@ -1245,10 +1251,12 @@  void init_all_cpus(void)
 			t->trace = boot_cpu->trace;
 			t->server_no = dt_property_get_cell(p, thread);
 			t->is_secondary = true;
-			t->primary = pt;
+			t->is_fused_core = pt0->is_fused_core;
+			t->primary = pt0;
+			t->ec_primary = (thread & 1) ? pt1 : pt0;
 			t->node = cpu;
 			t->chip_id = chip_id;
-			t->core_hmi_state_ptr = &pt->core_hmi_state;
+			t->core_hmi_state_ptr = &pt0->core_hmi_state;
 		}
 		prlog(PR_INFO, "CPU:  %d secondary threads\n", thread);
 	}
diff --git a/include/cpu.h b/include/cpu.h
index 05bd0941..5f8682bd 100644
--- a/include/cpu.h
+++ b/include/cpu.h
@@ -43,6 +43,7 @@  struct cpu_thread {
 	bool				is_secondary;
 	bool				is_fused_core;
 	struct cpu_thread		*primary;
+	struct cpu_thread		*ec_primary;
 	enum cpu_thread_state		state;
 	struct dt_node			*node;
 	struct trace_info		*trace;