From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f173.google.com (mail-pf1-f173.google.com [209.85.210.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CD4B3BADA2 for ; Mon, 6 Jul 2026 17:51:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783360284; cv=none; b=imIVGGI45gyFw+CNKNCrh2p1AWLw5Teb+r0S1jhRfTNfgvnvpLZHnsovrEO0Z5jVthKk9Mw8dzgSzBRzfqGA6yDRR528nv73gUT+yqdwYxGvInJInSYwl2v/pjf+FRaK7CKoIOObbJAot5Go5MjJZYGrpRgeYQW1+A0XNiIFKCs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783360284; c=relaxed/simple; bh=iqPcaDX8+ofWqR45cCOR80BwZ+rJfwSYzP09KL58uqU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LhCjOapskiUFednjm6quXwdvYUSCRCH9WDGFXMDx1lWqOxMo2Hl8Y4xzLec2UaE4TQ8/op36DA0ur/w6qpHg3qJlCWochSPY1DLzs1j4al7vWNOWwidnrk+vGQgvndPy/CvD1JzvhDmiqiQ7AwsgMhZ7Y/jm6EOx58XdvodEr9s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=BB3DSDpR; arc=none smtp.client-ip=209.85.210.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="BB3DSDpR" Received: by mail-pf1-f173.google.com with SMTP id d2e1a72fcca58-847968ca62fso3449334b3a.2 for ; Mon, 06 Jul 2026 10:51:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1783360282; x=1783965082; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=JUdPL7CBc2jTzzkN0FRzKQhA0cAKgFDmjflcqs1yy64=; b=BB3DSDpRGUlzBLzytFOVrlIsRZT07t9XM5304Jie7GkRmTD1x3Kd8nYuY8BNYawLHr FLdABza6VetEo98hyo452JIVSo9dRHu9okwfUAlejI6Cz2jk6ueUczMtdkemTI2ZxjwM yosl7cfOlUerVBf5JUjf3/rFlDMQ8eAGzhlYClIO7780iwDa6Sx7cN156a9ETRwu7LJG of/jQ1wvh/R9RdOBqIPyk2n5dXZ8A2vmN6yPmeJ4bN8dScWhB2Cw2fGJCP8JZVuxrMO0 +Y+RdYVNfWMahP4G2eVn8bAmqOcrHz2HDHIqBfZT4+Q+Ng451l9435cnJgqN4QO3I1hK q7Uw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783360282; x=1783965082; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JUdPL7CBc2jTzzkN0FRzKQhA0cAKgFDmjflcqs1yy64=; b=fdf3QoklHJywbGQyLHejPSeJGbQPdL0+PhsuYglVRqKYcomKuqsKy5FK5uXhVn2RYz L0rA94vFR6E3yZkp5dE0LAzqtZW9dxuD/ruFVWyFXxeXyL2xNDXdgV0RWsSWjTUjn3S6 SOupPuMcoqAk90wFZuRODUeoIBA/PwmhhGXlgNTiFmzyA0Zuch/QCGYfPtP2P20bhsqF 2IHW9a4o625k9BxSyIJWWgLe+cULE9e7nIonX9y309lp1Fm5mxiH2HFe8yPpEAroT3BS OzqnLhRfB22niEot62iN53zuIHXmtnABdPmoP1yL1hisYJCHNda17/KcJLQGhplV5au+ s80Q== X-Forwarded-Encrypted: i=1; AHgh+RoKKQ334XkAVJYCKLVilI3i/XpPSfKJKlCQ/9+MM3O5M5I4ffZxyBjwyh4dE0xlmXrpAhieMjvl2IoHw5JakJgX@vger.kernel.org X-Gm-Message-State: AOJu0YxE3WLotGdy0cg/Js66cUPryQoLSeI/qvFAEIj02ArscsEzh8Pj mdkO0LNfszr1ZtX3ffq44CkLtioJdfd4lZuTTIw+sHsK8JB7IGuxagu5HWtjLP06BGBQ30NlNVU FOnoZEv8= X-Gm-Gg: AfdE7cks34G/jrnWFtF5om0aIo06KwO9UfPG+Bx/wyUOxE/FXz+148fHCpFriPvVplh EOnCP5k7IoMyRWzTUoiFE9ZACHaUbB3I4lgNcgy9phipMzi7amr2McMvC+iED/OZ/DfUxYkyR9I dmhf+yBbbTybsgcx9WJfPlc64kgalFe9JOHxN2RpCUEGr3Tn+veuNZrSEyug96rBU2zAhVfMByb 8Tbfhrc98yWhxdUV1Wr1WAwU/o39RXJMrJDhe2x2LUwpARsjflx8Mg2rjp3ZLHSCT0dZsAnWb9D rKBgI6mGaDeGlCBdTd2r2Z+ceOx0fIIeETLGgM3bBNyiGaBUddDvX9g0HozqDHAuSG27bnUHpu7 C3wHF+tMOjSoXHEu6d7QEnxm/OIOIr2K6Lgon14G2LNKNBShjAZyqUmLxzrbNZK6j0fq1nu6nK9 fSayTezzPa5I830g== X-Received: by 2002:a05:6a00:4c1c:b0:847:8d2d:712f with SMTP id d2e1a72fcca58-84826b80fd2mr1589704b3a.10.1783360281535; Mon, 06 Jul 2026 10:51:21 -0700 (PDT) Received: from p14s ([2604:3d09:148c:c800:c7ae:56e:dc6:9a54]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847f6b60571sm4208461b3a.9.2026.07.06.10.51.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jul 2026 10:51:21 -0700 (PDT) Date: Mon, 6 Jul 2026 11:51:18 -0600 From: Mathieu Poirier To: Tanmay Shah Cc: andersson@kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 0/2] remoteproc: xlnx: remote crash recovery Message-ID: References: <20260630004806.3835488-1-tanmay.shah@amd.com> Precedence: bulk X-Mailing-List: linux-remoteproc@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: <20260630004806.3835488-1-tanmay.shah@amd.com> On Mon, Jun 29, 2026 at 05:48:04PM -0700, Tanmay Shah wrote: > Remote processor can crash or hang during normal execution. Linux > remoteproc framework supports different mechanisms to recover the > remote processor and re-establish the RPMsg communication in such case. > > Crash reporting on AMD-Xilinx platform: > > 1) Using debugfs node > > User can report the crash to the core framework via debugfs node using > following command: > > echo 1 > /sys/kernel/debug/remoteproc/remoteproc0/crash > > 2) Remoteproc notify to the host about crash state and crash reason > via the resource table > > This is a platform specific method where the remote firmware contains > vendor specific resource to update the crash state and the crash > reason. Then the remote notifies the crash to the host via mailbox > notification. The host then will check this resource on every mbox > notification and reports the crash to the core framework if needed. > > Crash recovery mechanism on AMD-Xilnx platform: > > There are two mechanisms available to recover the remote processor from > the crash. 1) boot recovery, 2) attach on recovery > > Remoteproc core framework will choose proper mechanism based on the > rproc features set by the platform driver. > > 1) Boot recovery > > This is the default mechanism to recover the remote processor. > In this method core framework will first stop the remote processor, > load the firmware again and then starts the remote processor. On > AMD-Xilinx platforms this method is supported. The default coredump > method is supported. > > 2) Attach on recovery > > If RPROC_ATTACH_ON_RECOVERY feature is enabled by the platform driver, > then the core framework will choose this method for recovery. > > On versal and later platforms following is the sequence of events expected > during remoteproc crash and attach on recovery: > > a) Remoteproc attach/detach flow is working, and RPMsg comm is established > b) Remote processor (RPU) crashed (crash not reported yet) > c) Platform management controller is instructed to stop and reload elf > on inactive remote processor before reboot (platform specific method) > d) Platform management controller reboots the remote processor > e) Remote processor boots again, and detects previous crash (platform > specific mechanism to detect the crash) > f) Remote processor Reports crash to the Linux (Host) and wait for > the recovery. > g) Linux performs full detach and reattach to remote processor. > h) Normal RPMsg communication is established. > > It is required to destroy all RPMsg related resources and recreate them > during recovery to establish successful RPMsg communication. To achieve > this complete rproc_detach followed by rproc_boot calls are needed. That > is what this patch-series is fixing along with adding rproc recovery > methods for AMD-Xilinx platforms. > > Change log: > > Changes in v6: > - %s/XLNX_RPROC_FW_CRASH_REASON/XLNX_RPROC_FW_CRASH_REPORT/ > - fix if else condition to reduce indent level > - %s/crash_state/crashed > - move setting rproc feature during probe > - remove redundant clearing of the features during detach() op > Applied. Thanks, Mathieu > Changes in v5: > - cache crash report to a local variable then act on it. > - End crash report string with '\0' without relying on fw > > Changes in v4: > - Optimize crash resource memory by changing type to u32 to u8 > - Introduce version field in the crash resource > - Check crash related condition before rproc state related condition > - Move crash reporting to the bottom half of the isr instead of > actual irq handler > - Introduce 16 bytes array in the crash report to store crash reason > in the string format > - Remove redundant type cast > > Changes in v3: > - %s/kick/mailbox notification/ > - %s/core framework/rproc core framework/ > - fold simple function within zynqmp_r5_handle_rsc(). > - remove spurious change > - reset crash state after reporting the crash > - document set and reset of ATTACH_ON_RECOVERY flag > - set recovery_disabled flag to false > - check condition rproc->crash_reason != NULL > > > Changes in v5: > - use local variable to access crash report pointer > - End crash report string with '\0' without relying on fw > > Changes in v4: > - move pieces needed from rproc_detach() to rproc_attach_recovery() to > cleanup the resources > - use rproc_attach() over __rproc_attach() to create resources again > - keep rproc_trigger_recovery() unmodified > - Optimize crash resource memory by changing type to u32 to u8 > - Introduce version field in the crash resource > - Check crash related condition before rproc state related condition > - Move crash reporting to the bottom half of the isr instead of > actual irq handler > - Introduce 16 bytes array in the crash report to store crash reason > in the string format > - Remove redundant type cast > > Changes in 3: > - both rproc_attach_recovery() and > rproc_boot_recovery() are called the same way. > - remove unrelated changes > - %s/kick/mailbox notification/ > - %s/core framework/rproc core framework/ > - fold simple function within zynqmp_r5_handle_rsc(). > - remove spurious change > - reset crash state after reporting the crash > - document set and reset of ATTACH_ON_RECOVERY flag > - set recovery_disabled flag to false > - check condition rproc->crash_reason != NULL > > Changes in v2: > - use rproc_boot instead of rproc_attach > - move debug message early in the function > - clear attach recovery boot flag during detach and stop ops > > Tanmay Shah (2): > remoteproc: core: full attach detach during recovery > remoteproc: xlnx: add crash detection mechanism > > drivers/remoteproc/remoteproc_core.c | 15 +++++- > drivers/remoteproc/xlnx_r5_remoteproc.c | 70 ++++++++++++++++++++++++- > 2 files changed, 83 insertions(+), 2 deletions(-) > > > base-commit: 78fb7968943f5064766af7f33d82e6bfe90e0db0 > -- > 2.34.1 >