From: Catalin Marinas <catalin.marinas@arm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
Robin Murphy <robin.murphy@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Ard Biesheuvel <ardb@kernel.org>,
Isaac Manjarres <isaacmanjarres@google.com>,
Saravana Kannan <saravanak@google.com>,
Alasdair Kergon <agk@redhat.com>, Daniel Vetter <daniel@ffwll.ch>,
Joerg Roedel <joro@8bytes.org>, Mark Brown <broonie@kernel.org>,
Mike Snitzer <snitzer@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-mm@kvack.org, iommu@lists.linux.dev,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 10/15] arm64: Allow kmalloc() caches aligned to the smaller cache_line_size()
Date: Wed, 24 May 2023 18:18:59 +0100 [thread overview]
Message-ID: <20230524171904.3967031-11-catalin.marinas@arm.com> (raw)
In-Reply-To: <20230524171904.3967031-1-catalin.marinas@arm.com>
On arm64, ARCH_DMA_MINALIGN is 128, larger than the cache line size on
most of the current platforms (typically 64). Define
ARCH_KMALLOC_MINALIGN to 8 (the default for architectures without their
own ARCH_DMA_MINALIGN) and override dma_get_cache_alignment() to return
cache_line_size(), probed at run-time. The kmalloc() caches will be
limited to the cache line size. This will allow the additional
kmalloc-{64,192} caches on most arm64 platforms.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
---
arch/arm64/include/asm/cache.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index a51e6e8f3171..ceb368d33bf4 100644
--- a/arch/arm64/include/asm/cache.h
+++ b/arch/arm64/include/asm/cache.h
@@ -33,6 +33,7 @@
* the CPU.
*/
#define ARCH_DMA_MINALIGN (128)
+#define ARCH_KMALLOC_MINALIGN (8)
#ifndef __ASSEMBLY__
@@ -90,6 +91,8 @@ static inline int cache_line_size_of_cpu(void)
int cache_line_size(void);
+#define dma_get_cache_alignment cache_line_size
+
/*
* Read the effective value of CTR_EL0.
*
next prev parent reply other threads:[~2023-05-24 17:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-24 17:18 [PATCH v5 00/15] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8 Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 01/15] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 02/15] dma: Allow dma_get_cache_alignment() to be overridden by the arch code Catalin Marinas
2023-05-25 13:59 ` Christoph Hellwig
2023-05-24 17:18 ` [PATCH v5 03/15] mm/slab: Simplify create_kmalloc_cache() args and make it static Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 04/15] mm/slab: Limit kmalloc() minimum alignment to dma_get_cache_alignment() Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 05/15] drivers/base: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 06/15] drivers/gpu: " Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 07/15] drivers/usb: " Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 08/15] drivers/spi: " Catalin Marinas
2023-05-24 17:18 ` [PATCH v5 09/15] drivers/md: " Catalin Marinas
2023-05-25 14:00 ` Christoph Hellwig
2023-05-24 17:18 ` Catalin Marinas [this message]
2023-05-24 17:19 ` [PATCH v5 11/15] scatterlist: Add dedicated config for DMA flags Catalin Marinas
2023-05-24 17:19 ` [PATCH v5 12/15] dma-mapping: Force bouncing if the kmalloc() size is not cache-line-aligned Catalin Marinas
2023-05-25 15:53 ` Robin Murphy
2023-05-24 17:19 ` [PATCH v5 13/15] iommu/dma: Force bouncing if the size is not cacheline-aligned Catalin Marinas
2023-05-25 15:57 ` Robin Murphy
2023-05-26 16:36 ` Jisheng Zhang
2023-05-26 19:22 ` Catalin Marinas
2023-05-30 13:01 ` Robin Murphy
2023-05-24 17:19 ` [PATCH v5 14/15] mm: slab: Reduce the kmalloc() minimum alignment if DMA bouncing possible Catalin Marinas
2023-05-24 17:19 ` [PATCH v5 15/15] arm64: Enable ARCH_WANT_KMALLOC_DMA_BOUNCE for arm64 Catalin Marinas
2023-05-25 16:12 ` Robin Murphy
2023-05-25 17:08 ` Catalin Marinas
2023-05-25 12:31 ` [PATCH v5 00/15] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8 Jonathan Cameron
2023-05-25 14:31 ` Catalin Marinas
2023-05-26 16:07 ` Jonathan Cameron
2023-05-26 16:29 ` Jonathan Cameron
2023-05-30 13:38 ` Catalin Marinas
2023-05-30 16:31 ` Jonathan Cameron
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