From: Sean Anderson <seanga2@gmail.com>
To: u-boot@lists.denx.de
Subject: [PATCH v7 14/22] riscv: Clear pending interrupts before enabling IPIs
Date: Thu, 19 Mar 2020 16:54:12 -0400 [thread overview]
Message-ID: <20200319205420.720815-15-seanga2@gmail.com> (raw)
In-Reply-To: <20200319205420.720815-1-seanga2@gmail.com>
On some platforms (k210), the previous stage bootloader may have not
cleared pending IPIs before transferring control to U-Boot. This can cause
race conditions, as multiple harts all attempt to initialize the IPI
controller at once. This patch clears IPIs before enabling them, ensuring
that only one hart modifies shared memory at once.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
---
Changes in v7:
- Split of into its own patch
arch/riscv/cpu/start.S | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
index 6b3ff99c38..e8740c8568 100644
--- a/arch/riscv/cpu/start.S
+++ b/arch/riscv/cpu/start.S
@@ -67,6 +67,8 @@ _start:
#else
li t0, SIE_SSIE
#endif
+ /* Clear any pending IPIs */
+ csrc MODE_PREFIX(ip), t0
csrs MODE_PREFIX(ie), t0
#endif
--
2.25.1
next prev parent reply other threads:[~2020-03-19 20:54 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 20:53 [PATCH v7 00/22] riscv: Add Sipeed Maix support Sean Anderson
2020-03-19 20:53 ` [PATCH v7 01/22] clk: Always use the supplied struct clk Sean Anderson
2020-03-19 20:54 ` [PATCH v7 02/22] clk: Check that ops of composite clock components exist before calling Sean Anderson
2020-03-19 20:54 ` [PATCH v7 03/22] clk: Unconditionally recursively en-/dis-able clocks Sean Anderson
2020-03-19 20:54 ` [PATCH v7 04/22] clk: Fix clk_get_by_* handling of index Sean Anderson
2020-03-30 6:42 ` Rick Chen
2020-03-19 20:54 ` [PATCH v7 05/22] clk: Add functions to register CCF clock structs Sean Anderson
2020-03-30 7:05 ` Rick Chen
2020-03-19 20:54 ` [PATCH v7 06/22] clk: Add K210 pll support Sean Anderson
2020-03-19 20:54 ` [PATCH v7 07/22] clk: Add a bypass clock for K210 Sean Anderson
2020-03-19 20:54 ` [PATCH v7 08/22] clk: Add K210 clock support Sean Anderson
2020-03-19 20:54 ` [PATCH v7 09/22] dm: Add support for simple-pm-bus Sean Anderson
2020-03-19 20:54 ` [PATCH v7 10/22] dm: Fix error handling for dev_read_addr_ptr Sean Anderson
2020-03-19 20:54 ` [PATCH v7 11/22] reset: Add generic reset driver Sean Anderson
2020-03-19 20:54 ` [PATCH v7 12/22] lib: Always set errno in hcreate_r Sean Anderson
2020-03-19 20:54 ` [PATCH v7 13/22] riscv: Add headers for asm/global_data.h Sean Anderson
2020-03-19 20:54 ` Sean Anderson [this message]
2020-03-27 9:04 ` [PATCH v7 14/22] riscv: Clear pending interrupts before enabling IPIs Rick Chen
2020-03-19 20:54 ` [PATCH v7 15/22] riscv: Clean up IPI initialization code Sean Anderson
2020-03-27 9:03 ` Rick Chen
2020-03-30 7:39 ` Rick Chen
2020-03-19 20:54 ` [PATCH v7 16/22] riscv: Add option to support RISC-V privileged spec 1.9 Sean Anderson
2020-03-19 20:54 ` [PATCH v7 17/22] riscv: Allow use of reset drivers Sean Anderson
2020-03-19 20:54 ` [PATCH v7 18/22] riscv: Try to get cpu frequency from a "clocks" node if it exists Sean Anderson
2020-03-19 20:54 ` [PATCH v7 19/22] riscv: Enable cpu clock if it is present Sean Anderson
2020-03-19 20:54 ` [PATCH v7 20/22] riscv: Add device tree for K210 and Sipeed Maix BitM Sean Anderson
2020-03-19 20:54 ` [PATCH v7 21/22] doc: riscv: Add documentation for Sipeed Maix Bit Sean Anderson
2020-03-19 20:54 ` [PATCH v7 22/22] riscv: Add Sipeed Maix support Sean Anderson
2020-03-30 7:14 ` Rick Chen
2020-03-30 8:39 ` Sean Anderson
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=20200319205420.720815-15-seanga2@gmail.com \
--to=seanga2@gmail.com \
--cc=u-boot@lists.denx.de \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox