Linux-csky Archive on lore.kernel.org
 help / color / Atom feed
From: guoren@kernel.org
To: guoren@kernel.org, arnd@arndb.de
Cc: linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org,
	linux-arch@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH 03/13] csky: Add cpu feature register hint for smp
Date: Sat,  1 Aug 2020 01:14:03 +0000
Message-ID: <1596244453-98575-4-git-send-email-guoren@kernel.org> (raw)
In-Reply-To: <1596244453-98575-1-git-send-email-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

CPU features registers are setup by customers' bootloader, but
Linux must help transfer them from the primary to secondary cores.
This patch add hint2 CPU feature register supported.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
---
 arch/csky/kernel/smp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index b5c5bc3..1945fb2 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -156,6 +156,7 @@ void __init setup_smp(void)
 extern void _start_smp_secondary(void);
 
 volatile unsigned int secondary_hint;
+volatile unsigned int secondary_hint2;
 volatile unsigned int secondary_ccr;
 volatile unsigned int secondary_stack;
 
@@ -168,6 +169,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 	secondary_stack =
 		(unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
 	secondary_hint = mfcr("cr31");
+	secondary_hint2 = mfcr("cr<21, 1>");
 	secondary_ccr  = mfcr("cr18");
 	secondary_msa1 = read_mmu_msa1();
 
@@ -209,6 +211,7 @@ void csky_start_secondary(void)
 	unsigned int cpu = smp_processor_id();
 
 	mtcr("cr31", secondary_hint);
+	mtcr("cr<21, 1>", secondary_hint2);
 	mtcr("cr18", secondary_ccr);
 
 	mtcr("vbr", vec_base);
-- 
2.7.4


  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01  1:14 [PATCH 00/13] Update csky subsystem for linux-5.9-rc1 guoren
2020-08-01  1:14 ` [PATCH 01/13] csky: remove unusued thread_saved_pc and *_segments functions/macros guoren
2020-08-01  1:14 ` [PATCH 02/13] csky: Add SECCOMP_FILTER supported guoren
2020-08-01  1:14 ` guoren [this message]
2020-08-01  1:14 ` [PATCH 04/13] csky: Fixup duplicated restore sp in RESTORE_REGS_FTRACE guoren
2020-08-01  1:14 ` [PATCH 05/13] csky: Fixup kprobes handler couldn't change pc guoren
2020-08-01  1:14 ` [PATCH 06/13] csky: Add support for function error injection guoren
2020-08-01  1:14 ` [PATCH 07/13] csky: Optimize the trap processing flow guoren
2020-08-01  1:14 ` [PATCH 08/13] csky: Use top-down mmap layout guoren
2020-08-01  1:14 ` [PATCH 09/13] csky: Set CONFIG_NR_CPU 4 as default guoren
2020-08-01  1:14 ` [PATCH 10/13] csky: Fixup warning by EXPORT_SYMBOL(kmap) guoren
2020-08-01  1:14 ` [PATCH 11/13] csky: Add irq_work support guoren
2020-08-01  1:14 ` [PATCH 12/13] csky: Add arch_show_interrupts for IPI interrupts guoren
2020-08-01  1:14 ` [PATCH 13/13] csky: Add context tracking support guoren

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1596244453-98575-4-git-send-email-guoren@kernel.org \
    --to=guoren@kernel.org \
    --cc=arnd@arndb.de \
    --cc=guoren@linux.alibaba.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-csky@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-csky Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-csky/0 linux-csky/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-csky linux-csky/ https://lore.kernel.org/linux-csky \
		linux-csky@vger.kernel.org
	public-inbox-index linux-csky

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-csky


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git