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Fri, 09 May 2025 07:06:26 -0700 (PDT) Received: from skbuf ([188.25.50.178]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ad2192d4a1dsm158053766b.17.2025.05.09.07.06.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 May 2025 07:06:25 -0700 (PDT) Date: Fri, 9 May 2025 17:06:22 +0300 From: Vladimir Oltean To: James Clark Cc: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Chester Lin , Matthias Brugger , Ghennadi Procopciuc , NXP S32 Linux Team , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , larisa.grigore@nxp.com, arnd@linaro.org, andrei.stefanescu@nxp.com, dan.carpenter@linaro.org, linux-spi@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Xulin Sun Subject: Re: [PATCH 03/14] spi: spi-fsl-dspi: restrict register range for regmap access Message-ID: <20250509140622.n2tc3dd23ylyux72@skbuf> References: <20250509-james-nxp-spi-v1-0-32bfcd2fea11@linaro.org> <20250509-james-nxp-spi-v1-3-32bfcd2fea11@linaro.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250509-james-nxp-spi-v1-3-32bfcd2fea11@linaro.org> On Fri, May 09, 2025 at 12:05:50PM +0100, James Clark wrote: > From: Larisa Grigore > > DSPI registers are NOT continuous, some registers are reserved and > accessing them from userspace will trigger external abort, add regmap > register access table to avoid below abort: > > Internal error: synchronous external abort: 96000210 1 PREEMPT SMP > Modules linked in: fuse dummy tun hse sch_fq_codel openvswitch nsh > nf_conncount nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 > CPU: 2 PID: 18231 Comm: read_all Not tainted 5.2.33-yocto-standard #1 > Hardware name: Freescale S32G275 (DT) > pstate: 20000085 (nzCv daIf -PAN -UAO) > pc : regmap_mmio_read32le+0x24/0x48 > lr : regmap_mmio_read+0x48/0x70 > sp : ffffff801123bb70 > x29: ffffff801123bb70 x28: ffffffc873b5c000 > x27: ffffff8010b408f0 x26: 0000000000000001 > x25: 000000000000013c x24: ffffff801123be40 > x23: 00000000000003ff x22: ffffff801123bcfc > x21: ffffff801123bcfc x20: ffffffc873a9e500 > x19: 0000000000000024 x18: 0000000000000020 > x17: 0000000000000000 x16: 0000000000000000 > x15: ffffffc876189160 x14: 0000000000000003 > x13: ffffffc873bf73ff x12: ffffffc873bf707e > x11: 0000000000000000 x10: 0000000000000000 > x9 : 0000000000000000 x8 : ffffffc83fca4e00 > x7 : 000000000000000f x6 : ffffffc873bf7083 > x5 : 00000000fffffff9 x4 : 0000000000000002 > x3 : ffffff801061f058 x2 : ffffff801061ee18 > x1 : 0000000000000024 x0 : ffffff8011490024 I think you can leave the register dump out, it doesn't seem of much use. > Call trace: > regmap_mmio_read32le+0x24/0x48 > regmap_mmio_read+0x48/0x70 > _regmap_bus_reg_read+0x38/0x48 > _regmap_read+0x68/0x1b0 > regmap_read+0x50/0x78 > regmap_read_debugfs+0x120/0x338 > regmap_map_read_file+0x44/0x58 > full_proxy_read+0x68/0x98 > __vfs_read+0x48/0x90 > vfs_read+0xb0/0x130 > ksys_read+0x7c/0x108 > __arm64_sys_read+0x24/0x30 > el0_svc_common.constprop.0+0x74/0x168 > el0_svc_handler+0x70/0x90 > el0_svc+0x8/0xc > > Co-developed-by: Xulin Sun > Signed-off-by: Xulin Sun > Signed-off-by: Larisa Grigore > Signed-off-by: James Clark > --- Do you have a reproducer for any of the supported SoCs? On LS1028A, "cat /sys/kernel/debug/regmap/2120000.spi/registers" runs fine and does not crash.