linux-kernel - [PATCH AUTOSEL 5.19 02/48] swiotlb: panic if nslabs is too small

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Message-Id: <20220814161943.2394452-2-sashal@kernel.org>
Date:   Sun, 14 Aug 2022 12:18:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dongli Zhang <dongli.zhang@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, hch@...radead.org,
        m.szyprowski@...sung.com, iommu@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.19 02/48] swiotlb: panic if nslabs is too small

From: Dongli Zhang <dongli.zhang@...cle.com>

[ Upstream commit 0bf28fc40d89b1a3e00d1b79473bad4e9ca20ad1 ]

Panic on purpose if nslabs is too small, in order to sync with the remap
retry logic.

In addition, print the number of bytes for tlb alloc failure.

Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/dma/swiotlb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index cb50f8d38360..03af7c3bee71 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -242,6 +242,9 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 	if (swiotlb_force_disable)
 		return;
 
+	if (nslabs < IO_TLB_MIN_SLABS)
+		panic("%s: nslabs = %lu too small\n", __func__, nslabs);
+
 	/*
 	 * By default allocate the bounce buffer memory from low memory, but
 	 * allow to pick a location everywhere for hypervisors with guest
@@ -254,7 +257,8 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
 	else
 		tlb = memblock_alloc_low(bytes, PAGE_SIZE);
 	if (!tlb) {
-		pr_warn("%s: failed to allocate tlb structure\n", __func__);
+		pr_warn("%s: Failed to allocate %zu bytes tlb structure\n",
+			__func__, bytes);
 		return;
 	}
 
-- 
2.35.1