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From: Jim Quinlan <james.quinlan@broadcom.com>
To: Christoph Hellwig <hch@lst.de>,
	bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com,
	james.quinlan@broadcom.com
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Eric DeVolder <eric.devolder@oracle.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Jonathan Corbet <corbet@lwn.net>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT),
	linux-kernel@vger.kernel.org (open list),
	"Mike Rapoport (IBM)" <rppt@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
	Sebastian Reichel <sebastian.reichel@collabora.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: RFC: ARM && restricted DMA apparently not working
Date: Tue, 26 Sep 2023 13:52:05 -0400	[thread overview]
Message-ID: <20230926175208.9298-1-james.quinlan@broadcom.com> (raw)

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We've just started using the resticted memory feature (DMA_RESTRICTED_POOL)
which isolates a region for DMA memory for a particular device,
SWIOTLB-style.  This feature works with ARCH=arm64 but does not work on
ARCH=arm unless I apply the commit to select DMA_DIRECT_REMAP.  This seems
to hold from 5.15 to the present.

I've noticed that arm64 selects DMA_DIRECT_REMAP and arm does not and I'm
guessing that there may be a reason for this?

Regards,
Jim Quinlan
Broadcom STB/CM

Jim Quinlan (1):
  ARM: Select DMA_DIRECT_REMAP to fix restricted memory

 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)


base-commit: 6465e260f48790807eef06b583b38ca9789b6072
-- 
2.17.1


[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/pkcs7-signature, Size: 4210 bytes --]

             reply	other threads:[~2023-09-26 17:52 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-26 17:52 Jim Quinlan [this message]
2023-09-26 17:52 ` [PATCH v1 1/1] ARM: Select DMA_DIRECT_REMAP to fix restricted DMA Jim Quinlan
2023-09-27  7:13   ` kernel test robot
2023-09-27 23:10   ` Linus Walleij
2023-09-28 12:07     ` Jim Quinlan
2023-09-28 13:09       ` Jim Quinlan
2023-09-28 13:32       ` Arnd Bergmann
2023-09-28 14:00         ` Jim Quinlan
2023-09-28 14:01           ` Jim Quinlan
2023-09-28 15:16           ` Arnd Bergmann
2023-09-28 15:33             ` Robin Murphy
2023-09-28 16:20               ` Arnd Bergmann
2023-09-29 19:24             ` Jim Quinlan
2023-09-29 19:52               ` Arnd Bergmann
2023-09-29 21:13                 ` Jim Quinlan
2023-10-01 12:48                 ` Jim Quinlan
2023-09-28 15:47       ` Robin Murphy
2023-10-02 12:33         ` Jim Quinlan
2023-10-02 15:08           ` Robin Murphy
2023-10-02  6:16     ` Christoph Hellwig
2023-10-05 17:53       ` Jim Quinlan
2023-10-06  7:40         ` Christoph Hellwig
     [not found]           ` <CGME20231020081648eucas1p17d2572cfca5762d2f5cbc560dd648564@eucas1p1.samsung.com>
2023-10-20  8:16             ` Marek Szyprowski
2023-10-23  6:16               ` Christoph Hellwig
2023-09-28 16:24   ` Christophe Leroy

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