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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com;\n h=from : to : cc : subject\n : date : message-id : content-transfer-encoding : mime-version; s=pp1;\n bh=wWIiCSijmlG3Sv/ZMIEuQjjzkV4IGk287dsg/C4RpKY=;\n b=MFACxQev5m9eZpSonqW1Rx877wsro6jo9nqhElLkNu14ByoUlfkKHr3t4AbNZXlBOmbm\n nr7G5DDnAa27eWTK1ca30WrQfbbmBudN/x9/lNafweUTMuI81sHiPu91F8BE7yMX3LlX\n YrBk1MeYLRryHTfXerUluFPUXBHDAtr4n2mgQ/ebW98mk3Q+GV66IF6q4RPpTveRQUuj\n lItaBfMU+NayRQM0Tiw4eL5c1s8EnJzuzUQ27kI+lzOFfl+fgy7cV5TwPUg+omiu8UWj\n gwQq6Tb2LKnTxHj2sVu6yCtiO/kcgesJ4Fw9tlUAqwA2Npez/j5whajkiHUBNth5cmG3 ZA==", "From": "Hari Bathini <hbathini@linux.ibm.com>", "To": "Michael Ellerman <mpe@ellerman.id.au>", "Subject": "[PATCH v2 0/3] powerpc/fadump: pass additional args to dump capture\n kernel", "Date": "Thu, 9 May 2024 17:27:52 +0530", "Message-ID": "<20240509115755.519982-1-hbathini@linux.ibm.com>", "X-Mailer": "git-send-email 2.45.0", "X-TM-AS-GCONF": "00", "X-Proofpoint-ORIG-GUID": "gMYscPaC0194dzEW-TvaJ9xebrF_5ZU_", "X-Proofpoint-GUID": "gMYscPaC0194dzEW-TvaJ9xebrF_5ZU_", "Content-Transfer-Encoding": "8bit", "X-Proofpoint-UnRewURL": "0 URL was un-rewritten", "MIME-Version": "1.0", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.650,FMLib:17.11.176.26\n definitions=2024-05-09_06,2024-05-09_01,2023-05-22_02", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n adultscore=0\n lowpriorityscore=0 mlxscore=0 bulkscore=0 clxscore=1011 suspectscore=0\n impostorscore=0 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501\n mlxlogscore=492 classifier=spam adjust=0 reason=mlx scancount=1\n engine=8.12.0-2405010000 definitions=main-2405090079", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>", "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>", "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>", "List-Subscribe": "<https://lists.ozlabs.org/listinfo/linuxppc-dev>,\n <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>", "Cc": "linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,\n Mahesh J Salgaonkar <mahesh@linux.ibm.com>,\n Sourabh Jain <sourabhjain@linux.ibm.com>", "Errors-To": "linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org", "Sender": "\"Linuxppc-dev\"\n <linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org>" }, "content": "While fadump is a more reliable alternative to kdump dump capturing\nmethod, it doesn't support passing additional parameters. Having\nsuch support is desirable for two major reasons:\n\n 1. It helps minimize the memory consumption of fadump dump capture\n kernel by disabling features that consume considerable amount of\n memory but have little significance for dump capture environment\n (eg. numa, cma, cgroup, etc.)\n 2. It helps disable such features/components in dump capture kernel\n that are unstable and/or are being debugged.\n\nThis patch series is a follow-up to [1]. Adds support for passing\nadditional parameters to fadump capture kernel to make it more\ndesirable. For this, a dedicated area is passed between production\nkernel and capture kerenl to pass these additional parameters. This\nsupport is enabled only on pseries as of now. The dedicated area is\nreferred to as RTAS_FADUMP_PARAM_AREA.\n\nIn radix MMU mode, this dedicated area can be anywhere but in case of\nhash MMU, it can only be in the first memory block to be accessible\nduring early boot. Enabling this feature support in both radix and\nhash MMU modes but in hash MMU only when RMA size is 768MB or more\nto avoid complex memory real estate with FW components.\n\nThe first patch adds support for multiple boot memory regions to make\naddition of any new region types simpler. The second patch sets up the\nparameter (dedicated) area to be passed to the capture kernel.\n/sys/kernel/fadump/bootargs_append is exported to the userspace to\nspecify the additional parameters to be passed to the capture kernel.\nThe last patch appends the parameters to bootargs during capture\nkernel boot.\n\nChanges in v2:\n* RFC tag removed.\n* Moved variable declaration out of switch case.\n* Zero'ed the parameter area while setting up.\n* Reserving the parameter area only when needed.\n\n[1] https://lore.kernel.org/linuxppc-dev/20231205201835.388030-1-hbathini@linux.ibm.com/\n\nHari Bathini (3):\n powerpc/pseries/fadump: add support for multiple boot memory regions\n powerpc/fadump: setup additional parameters for dump capture kernel\n powerpc/fadump: pass additional parameters when fadump is active\n\n arch/powerpc/include/asm/fadump-internal.h | 5 +-\n arch/powerpc/include/asm/fadump.h | 2 +\n arch/powerpc/kernel/fadump.c | 149 ++++++++--\n arch/powerpc/kernel/prom.c | 3 +\n arch/powerpc/platforms/powernv/opal-fadump.c | 13 +-\n arch/powerpc/platforms/pseries/rtas-fadump.c | 290 +++++++++++++------\n arch/powerpc/platforms/pseries/rtas-fadump.h | 29 +-\n 7 files changed, 366 insertions(+), 125 deletions(-)" }