linux-kernel - [PATCH 5.18 138/879] of: Support more than one crash kernel regions for kexec -s

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Message-Id: <20220607165006.711247089@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 18:54:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhen Lei <thunder.leizhen@...wei.com>,
        Rob Herring <robh@...nel.org>, Baoquan He <bhe@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 138/879] of: Support more than one crash kernel regions for kexec -s

From: Zhen Lei <thunder.leizhen@...wei.com>

[ Upstream commit 8af6b91f58341325bf74ecb0389ddc0039091d84 ]

When "crashkernel=X,high" is used, there may be two crash regions:
high=crashk_res and low=crashk_low_res. But now the syscall
kexec_file_load() only add crashk_res into "linux,usable-memory-range",
this may cause the second kernel to have no available dma memory.

Fix it like kexec-tools does for option -c, add both 'high' and 'low'
regions into the dtb.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Acked-by: Rob Herring <robh@...nel.org>
Acked-by: Baoquan He <bhe@...hat.com>
Link: https://lore.kernel.org/r/20220506114402.365-6-thunder.leizhen@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/of/kexec.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index b9bd1cff1793..8d374cc552be 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -386,6 +386,15 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
 				crashk_res.end - crashk_res.start + 1);
 		if (ret)
 			goto out;
+
+		if (crashk_low_res.end) {
+			ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+					"linux,usable-memory-range",
+					crashk_low_res.start,
+					crashk_low_res.end - crashk_low_res.start + 1);
+			if (ret)
+				goto out;
+		}
 	}
 
 	/* add bootargs */
-- 
2.35.1