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From: Christoph Hellwig <hch@lst.de>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org
Subject: [PATCH 7/7] swiotlb: don't override the command line in swiotlb_adjust_size
Date: Thu, 22 Apr 2021 09:19:21 +0200	[thread overview]
Message-ID: <20210422071921.1428607-8-hch@lst.de> (raw)
In-Reply-To: <20210422071921.1428607-1-hch@lst.de>

When the user specified an explicit swiotlb size on the command line,
the achitecture code should not override it.

Fixes: 2cbc2776efe4 ("swiotlb: remove swiotlb_nr_tbl")
Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 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 87d06ddf4753f3..aef02a3825b494 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -106,7 +106,9 @@ void swiotlb_set_max_segment(unsigned int val)
 
 unsigned long swiotlb_size_or_default(void)
 {
-	return swiotlb_default_size;
+	if (swiotlb_default_size)
+		return swiotlb_default_size;
+	return IO_TLB_DEFAULT_SIZE;
 }
 
 void __init swiotlb_adjust_size(unsigned long size)
@@ -116,6 +118,8 @@ void __init swiotlb_adjust_size(unsigned long size)
 	 * architectures such as those supporting memory encryption to
 	 * adjust/expand SWIOTLB size for their use.
 	 */
+	if (swiotlb_default_size)
+		return;
 	swiotlb_default_size = ALIGN(size, IO_TLB_SEGSIZE << IO_TLB_SHIFT);
 	pr_info("SWIOTLB bounce buffer size adjusted to %luMB",
 		swiotlb_default_size >> 20);
-- 
2.30.1



  parent reply	other threads:[~2021-04-22  7:20 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22  7:19 cleanup and fix swiotlb sizing Christoph Hellwig
2021-04-22  7:19 ` [PATCH 1/7] swiotlb: pass bytes instead of nslabs to swiotlb_init_with_tbl Christoph Hellwig
2021-04-22  7:19 ` [PATCH 2/7] swiotlb: use swiotlb_size_or_default in swiotlb_init Christoph Hellwig
2021-04-22  7:19 ` [PATCH 3/7] swiotlb: use swiotlb_adjust_size in setup_io_tlb_npages Christoph Hellwig
2021-04-22  7:19 ` [PATCH 4/7] powerpc/pseries: simplify svm_swiotlb_init Christoph Hellwig
2021-04-22  7:19 ` [PATCH 5/7] MIPS/octeon: simplify swiotlb initialization Christoph Hellwig
2021-04-22  7:19 ` [PATCH 6/7] swiotlb: replace default_nslabs with a byte value Christoph Hellwig
2021-04-22  7:19 ` Christoph Hellwig [this message]
2021-04-23  5:23   ` [PATCH 7/7] swiotlb: don't override the command line in swiotlb_adjust_size Tom Lendacky

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