From patchwork Wed Jul 8 01:34:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Glass X-Patchwork-Id: 240946 List-Id: U-Boot discussion From: sjg at chromium.org (Simon Glass) Date: Tue, 7 Jul 2020 19:34:27 -0600 Subject: [PATCH v4 07/25] x86: mp_init: Set up the CPU numbers at the start In-Reply-To: <20200708013446.2600256-1-sjg@chromium.org> References: <20200708013446.2600256-1-sjg@chromium.org> Message-ID: <20200708013446.2600256-8-sjg@chromium.org> At present each CPU is given a number when it starts itself up. While this saves a tiny amount of time by doing the device-tree read in parallel, it is confusing that the numbering happens on the fly. Move this code into mp_init() and do it at the start. Signed-off-by: Simon Glass Reviewed-by: Wolfgang Wallner Reviewed-by: Bin Meng --- (no changes since v1) arch/x86/cpu/mp_init.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/x86/cpu/mp_init.c b/arch/x86/cpu/mp_init.c index df43f71572..6f6de49df0 100644 --- a/arch/x86/cpu/mp_init.c +++ b/arch/x86/cpu/mp_init.c @@ -444,12 +444,6 @@ static int mp_init_cpu(struct udevice *cpu, void *unused) { struct cpu_platdata *plat = dev_get_parent_platdata(cpu); - /* - * Multiple APs are brought up simultaneously and they may get the same - * seq num in the uclass_resolve_seq() during device_probe(). To avoid - * this, set req_seq to the reg number in the device tree in advance. - */ - cpu->req_seq = dev_read_u32_default(cpu, "reg", -1); plat->ucode_version = microcode_read_rev(); plat->device_id = gd->arch.x86_device; @@ -465,13 +459,8 @@ int mp_init(void) int num_aps, num_cpus; atomic_t *ap_count; struct udevice *cpu; - int ret; - - /* This will cause the CPUs devices to be bound */ struct uclass *uc; - ret = uclass_get(UCLASS_CPU, &uc); - if (ret) - return ret; + int ret; if (IS_ENABLED(CONFIG_QFW)) { ret = qemu_cpu_fixup(); @@ -479,6 +468,14 @@ int mp_init(void) return ret; } + /* + * Multiple APs are brought up simultaneously and they may get the same + * seq num in the uclass_resolve_seq() during device_probe(). To avoid + * this, set req_seq to the reg number in the device tree in advance. + */ + uclass_id_foreach_dev(UCLASS_CPU, cpu, uc) + cpu->req_seq = dev_read_u32_default(cpu, "reg", -1); + ret = init_bsp(&cpu); if (ret) { debug("Cannot init boot CPU: err=%d\n", ret);