iommu.lists.linux-foundation.org archive mirror
 help / color / mirror / Atom feed
From: Will Deacon <will@kernel.org>
To: iommu@lists.linux-foundation.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org,
	Nathan Chancellor <nathan@kernel.org>,
	Claire Chang <tientzu@chromium.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Christoph Hellwig <hch@lst.de>,
	Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH 4/5] swiotlb: Emit diagnostic in swiotlb_exit()
Date: Mon, 19 Jul 2021 13:30:53 +0100	[thread overview]
Message-ID: <20210719123054.6844-5-will@kernel.org> (raw)
In-Reply-To: <20210719123054.6844-1-will@kernel.org>

A recent debugging session would have been made a little bit easier if
we had noticed sooner that swiotlb_exit() was being called during boot.

Add a simple diagnostic message to swiotlb_exit() to complement the one
from swiotlb_print_info() during initialisation.

Cc: Claire Chang <tientzu@chromium.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20210705190352.GA19461@willie-the-truck
Suggested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
 kernel/dma/swiotlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 7948f274f9bb..b3c793ed9e64 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -334,6 +334,7 @@ void __init swiotlb_exit(void)
 	if (!mem->nslabs)
 		return;
 
+	pr_info("tearing down default memory pool\n");
 	size = array_size(sizeof(*mem->slots), mem->nslabs);
 	if (mem->late_alloc)
 		free_pages((unsigned long)mem->slots, get_order(size));
-- 
2.32.0.402.g57bb445576-goog

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply	other threads:[~2021-07-19 12:31 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 12:30 [PATCH 0/5] Fix restricted DMA vs swiotlb_exit() Will Deacon
2021-07-19 12:30 ` [PATCH 1/5] of: Return success from of_dma_set_restricted_buffer() when !OF_ADDRESS Will Deacon
2021-07-20  3:35   ` Claire Chang
2021-07-19 12:30 ` [PATCH 2/5] swiotlb: Point io_default_tlb_mem at static allocation Will Deacon
2021-07-20  3:35   ` Claire Chang
2021-07-20  7:51   ` Christoph Hellwig
2021-07-20  8:49     ` Will Deacon
2021-07-19 12:30 ` [PATCH 3/5] swiotlb: Remove io_tlb_default_mem indirection Will Deacon
2021-07-20  3:35   ` Claire Chang
2021-07-19 12:30 ` Will Deacon [this message]
2021-07-20  3:36   ` [PATCH 4/5] swiotlb: Emit diagnostic in swiotlb_exit() Claire Chang
2021-07-19 12:30 ` [PATCH 5/5] swiotlb: Free tbl memory " Will Deacon
2021-07-20  3:36   ` Claire Chang
2021-07-20  8:35     ` Will Deacon
2021-07-20  7:51 ` [PATCH 0/5] Fix restricted DMA vs swiotlb_exit() Christoph Hellwig

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=20210719123054.6844-5-will@kernel.org \
    --to=will@kernel.org \
    --cc=hch@lst.de \
    --cc=iommu@lists.linux-foundation.org \
    --cc=konrad.wilk@oracle.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=nathan@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=tientzu@chromium.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
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;
as well as URLs for NNTP newsgroup(s).