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[v4,08/25] x86: mp_init: Adjust bsp_init() to return more information

Message ID 20200708013446.2600256-9-sjg@chromium.org
State Superseded
Headers show
Series x86: Enhance MTRR functionality to support multiple CPUs | expand

Commit Message

Simon Glass July 8, 2020, 1:34 a.m. UTC 
This function is misnamed since it does not actually init the BSP. Also
it is convenient to adjust it to return a little more information.

Rename and update the function, to allow it to return the BSP CPU device
and number, as well as the total number of CPUs.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner at br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---

Changes in v4:
- Update get_bsp() to return zero when SMP is not inited

Changes in v2:
- Drop change to include/dm/uclass.h
- Mention error return in get_bsp()

 arch/x86/cpu/mp_init.c | 36 +++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)
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Patch

diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c
index 6f6de49df0..9fdde7832a 100644
--- a/arch/x86/cpu/mp_init.c
+++ b/arch/x86/cpu/mp_init.c
@@ -421,9 +421,18 @@  static int bsp_do_flight_plan(struct udevice *cpu, struct mp_flight_plan *plan,
 	return ret;
 }
 
-static int init_bsp(struct udevice **devp)
+/**
+ * get_bsp() - Get information about the bootstrap processor
+ *
+ * @devp: If non-NULL, returns CPU device corresponding to the BSP
+ * @cpu_countp: If non-NULL, returns the total number of CPUs
+ * @return CPU number of the BSP, or -ve on error. If multiprocessing is not
+ *	enabled, returns 0
+ */
+static int get_bsp(struct udevice **devp, int *cpu_countp)
 {
 	char processor_name[CPU_MAX_NAME_LEN];
+	struct udevice *dev;
 	int apic_id;
 	int ret;
 
@@ -431,13 +440,20 @@  static int init_bsp(struct udevice **devp)
 	debug("CPU: %s\n", processor_name);
 
 	apic_id = lapicid();
-	ret = find_cpu_by_apic_id(apic_id, devp);
-	if (ret) {
+	ret = find_cpu_by_apic_id(apic_id, &dev);
+	if (ret < 0) {
 		printf("Cannot find boot CPU, APIC ID %d\n", apic_id);
 		return ret;
 	}
+	ret = cpu_get_count(dev);
+	if (ret < 0)
+		return log_msg_ret("count", ret);
+	if (devp)
+		*devp = dev;
+	if (cpu_countp)
+		*cpu_countp = ret;
 
-	return 0;
+	return dev->req_seq >= 0 ? dev->req_seq : 0;
 }
 
 static int mp_init_cpu(struct udevice *cpu, void *unused)
@@ -476,24 +492,18 @@  int mp_init(void)
 	uclass_id_foreach_dev(UCLASS_CPU, cpu, uc)
 		cpu->req_seq = dev_read_u32_default(cpu, "reg", -1);
 
-	ret = init_bsp(&cpu);
-	if (ret) {
+	ret = get_bsp(&cpu, &num_cpus);
+	if (ret < 0) {
 		debug("Cannot init boot CPU: err=%d\n", ret);
 		return ret;
 	}
 
-	num_cpus = cpu_get_count(cpu);
-	if (num_cpus < 0) {
-		debug("Cannot get number of CPUs: err=%d\n", num_cpus);
-		return num_cpus;
-	}
-
 	if (num_cpus < 2)
 		debug("Warning: Only 1 CPU is detected\n");
 
 	ret = check_cpu_devices(num_cpus);
 	if (ret)
-		debug("Warning: Device tree does not describe all CPUs. Extra ones will not be started correctly\n");
+		log_warning("Warning: Device tree does not describe all CPUs. Extra ones will not be started correctly\n");
 
 	/* Copy needed parameters so that APs have a reference to the plan */
 	mp_info.num_records = ARRAY_SIZE(mp_steps);