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From: Yassine Oudjana <y.oudjana@protonmail.com>
To: "will@kernel.org" <will@kernel.org>
Cc: "ardb@kernel.org" <ardb@kernel.org>,
	"arnd@arndb.de" <arnd@arndb.de>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	"kernel-team@android.com" <kernel-team@android.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"vincent.whitchurch@axis.com" <vincent.whitchurch@axis.com>,
	"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>
Subject: Re: [PATCH] arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)
Date: Tue, 06 Jul 2021 09:26:59 +0000	[thread overview]
Message-ID: <uHgsRacR8hJ7nW-I-pIcehzg-lNIn7NJvaL7bP9tfAftFsBjsgaY2qTjG9zyBgxHkjNL1WPNrD7YVv2JVD2_Wy-a5VTbcq-1xEi8ZnwrXBo=@protonmail.com> (raw)

In-Reply-To: <20210527124356.22367-1-will@kernel.org>

> Reduce ARCH_DMA_MINALIGN to 64 bytes and allow the warning/taint to
> indicate if there are machines that unknowingly rely on this.

The warning is being triggered on Qualcomm MSM8996, as well as the out-of-spec taint:

------------[ cut here ]------------
rtc-pm8xxx 400f000.qcom,spmi:pmic@0:rtc@6000: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (64 < 128)
WARNING: CPU: 0 PID: 1 at arch/arm64/mm/dma-mapping.c:45 arch_setup_dma_ops+0xf8/0x10c
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Tainted: G S                5.13.0+ #43
Hardware name: Xiaomi Mi Note 2 (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
pc : arch_setup_dma_ops+0xf8/0x10c
lr : arch_setup_dma_ops+0xf8/0x10c
sp : ffff80001003bb50
x29: ffff80001003bb50 x28: 0000000000000000 x27: ffff800010ee04c0
x26: ffff800010f41060 x25: 00000000ffffffff x24: 0000000000000000
x23: 0000000000000080 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000100000000 x19: ffff00008143e010 x18: ffffffffffffffff
x17: 696c206f74205d72 x16: 656874655f675b20 x15: ffff800011212d34
x14: 0000000000000000 x13: ffff8000110d4620 x12: 0000000000001047
x11: 000000000000056d x10: ffff8000110d4620 x9 : ffff8000110d4620
x8 : 00000000ffffefff x7 : ffff80001112c620 x6 : ffff80001112c620
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000080098000
Call trace:
arch_setup_dma_ops+0xf8/0x10c
of_dma_configure_id+0x120/0x2a4
platform_dma_configure+0x24/0x40
really_probe.part.0+0x50/0x2fc
__driver_probe_device+0x98/0x144
driver_probe_device+0xc8/0x15c
__driver_attach+0xf8/0x190
bus_for_each_dev+0x70/0xd0
driver_attach+0x24/0x30
bus_add_driver+0x104/0x1ec
driver_register+0x78/0x130
__platform_driver_register+0x28/0x34
pm8xxx_rtc_driver_init+0x1c/0x28
do_one_initcall+0x50/0x1b0
kernel_init_freeable+0x214/0x298
kernel_init+0x28/0x12c
ret_from_fork+0x10/0x18
---[ end trace 09b7616a3af9b190 ]---

This warning is triggered with nearly every driver probe, not only rtc-pm8xxx.

         reply	other threads:[~2021-07-06  9:27 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27 12:43 [PATCH] arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES) Will Deacon
2021-05-27 13:11 ` Catalin Marinas
2021-05-27 13:19 ` Mark Rutland
2021-05-28  9:35   ` Arnd Bergmann
2021-06-01 10:14     ` Catalin Marinas
2021-05-31  5:38 ` Ard Biesheuvel
2021-06-01 18:21 ` Will Deacon
     [not found] ` <CGME20210602132541eucas1p17127696041c26c00d1d2f50bef9cfaf0@eucas1p1.samsung.com>
2021-06-02 13:25   ` Marek Szyprowski
2021-06-02 13:51     ` Mark Rutland
2021-06-02 14:09       ` Marek Szyprowski
2021-06-02 14:14         ` Arnd Bergmann
2021-06-02 14:28           ` Marek Szyprowski
2021-06-02 14:52             ` Arnd Bergmann
2021-06-07 12:17               ` Arnd Bergmann
2021-06-04 10:01         ` Mark Rutland
2021-06-07  9:58           ` Marek Szyprowski
2021-06-07 12:01             ` Mark Rutland
2021-06-07 13:08               ` Mark Rutland
2021-06-07 13:39                 ` Will Deacon
2021-06-07 13:39                   ` Will Deacon
2021-06-07 13:56                   ` Mark Rutland
2021-06-07 13:56                     ` Mark Rutland
2021-06-07 13:57                   ` Arnd Bergmann
2021-06-07 13:57                     ` Arnd Bergmann
2021-06-07 15:17                     ` Maxime Ripard
2021-06-07 15:17                       ` Maxime Ripard
2021-06-07 15:50                       ` Arnd Bergmann
2021-06-07 15:50                         ` Arnd Bergmann
2021-06-08  8:57                         ` Mark Rutland
2021-06-08  8:57                           ` Mark Rutland
2021-06-07 15:32                     ` Mark Rutland
2021-06-07 15:32                       ` Mark Rutland
2021-06-02 14:11       ` Arnd Bergmann
2021-06-02 14:15         ` Marek Szyprowski
2021-07-06  9:26 ` Yassine Oudjana [this message]
2021-07-06 10:26   ` Catalin Marinas
2021-07-06 10:26     ` Catalin Marinas
2021-07-06 13:29     ` Robin Murphy
2021-07-06 13:29       ` Robin Murphy
2021-07-06 13:33       ` Will Deacon
2021-07-06 13:33         ` Will Deacon
2021-07-06 13:44         ` Marc Zyngier
2021-07-06 13:44           ` Marc Zyngier
2021-07-06 14:21           ` Robin Murphy
2021-07-06 14:21             ` Robin Murphy
2021-07-06 14:30           ` Arnd Bergmann
2021-07-06 14:30             ` Arnd Bergmann
2021-07-06 14:46             ` Marc Zyngier
2021-07-06 14:46               ` Marc Zyngier
2021-07-06 15:43               ` Arnd Bergmann
2021-07-06 15:43                 ` Arnd Bergmann
2021-07-06 17:15                 ` Yassine Oudjana
2021-07-06 17:15                   ` Yassine Oudjana
2021-07-06 20:33                   ` Arnd Bergmann
2021-07-06 20:33                     ` Arnd Bergmann
2021-07-06 22:27                     ` Bjorn Andersson
2021-07-06 22:27                       ` Bjorn Andersson
2021-07-07  9:27                       ` Will Deacon
2021-07-07  9:27                         ` Will Deacon
2021-07-07  8:24                     ` Yassine Oudjana
2021-07-07  8:24                       ` Yassine Oudjana
2021-07-07  9:29                       ` Arnd Bergmann
2021-07-07  9:29                         ` Arnd Bergmann
2021-07-07 14:41                         ` Jeffrey Hugo
2021-07-07 14:41                           ` Jeffrey Hugo
2021-07-08 20:59                           ` Jeffrey Hugo
2021-07-08 20:59                             ` Jeffrey Hugo
2021-07-09  8:48                             ` Will Deacon
2021-07-09  8:48                               ` Will Deacon
2021-07-09 17:10                               ` Catalin Marinas
2021-07-09 17:10                                 ` Catalin Marinas
2021-07-06 16:20             ` Will Deacon
2021-07-06 16:20               ` Will Deacon

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