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Mon, 17 Feb 2025 07:17:25 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8F2A620049; Mon, 17 Feb 2025 07:17:23 +0000 (GMT) Received: from li-3c92a0cc-27cf-11b2-a85c-b804d9ca68fa.in.ibm.com (unknown [9.109.199.160]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 17 Feb 2025 07:17:23 +0000 (GMT) From: Aditya Gupta To: Cc: , Nicholas Piggin , Daniel Henrique Barboza , Harsh Prateek Bora , Sourabh Jain , Mahesh J Salgaonkar , Hari Bathini Subject: [PATCH 6/6] hw/ppc: Enable Fadump for PSeries Date: Mon, 17 Feb 2025 12:47:11 +0530 Message-ID: <20250217071711.83735-7-adityag@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250217071711.83735-1-adityag@linux.ibm.com> References: <20250217071711.83735-1-adityag@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: MXiIp1SRpwmQRa27hadRjzWWF4-RzD3E X-Proofpoint-ORIG-GUID: _E87D-rRuPIxg-givNSoJv0lONYOLDe1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-17_03,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502170060 Received-SPF: pass client-ip=148.163.156.1; envelope-from=adityag@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.01, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org With all support in place, enable fadump by exporting the "ibm,configure-kernel-dump" RTAS call in the device tree. Presence of "ibm,configure-kernel-dump" tells the kernel that the platform (QEMU) supports fadump. Pass "fadump=on" to enable Linux to use firmware assisted dump. Logs of a linux boot with firmware assisted dump: ./build/qemu-system-ppc64 -M pseries,x-vof=on --cpu power10 --smp 4 -m 4G -kernel some-vmlinux -initrd some-initrd -append "debug fadump=on crashkernel=1G" -nographic [ 0.000000] random: crng init done [ 0.000000] fadump: Reserved 1024MB of memory at 0x00000040000000 (System RAM: 4096MB) ... [ 1.084686] rtas fadump: Registration is successful! ... # cat /sys/kernel/debug/powerpc/fadump_region CPU :[0x00000040000000-0x000000400013d3] 0x13d4 bytes, Dumped: 0x0 HPTE:[0x000000400013d4-0x000000400013d3] 0x0 bytes, Dumped: 0x0 DUMP: Src: 0x00000000000000, Dest: 0x00000040010000, Size: 0x40000000, Dumped: 0x0 bytes [0x000000fffff800-0x000000ffffffff]: cmdline append: '' # echo c > /proc/sysrq-trigger The fadump boot after crash: [ 0.000000] rtas fadump: Firmware-assisted dump is active. [ 0.000000] fadump: Updated cmdline: debug fadump=on crashkernel=1G [ 0.000000] fadump: Firmware-assisted dump is active. [ 0.000000] fadump: Reserving 3072MB of memory at 0x00000040000000 for preserving crash data .... # file /proc/vmcore /proc/vmcore: ELF 64-bit LSB core file, 64-bit PowerPC or cisco 7500, OpenPOWER ELF V2 ABI, version 1 (SYSV), SVR4-style Analysing the vmcore with crash-utility: KERNEL: vmlinux-6.14-rc2 DUMPFILE: vmcore-a64dcfb451e2-nocma CPUS: 4 DATE: Thu Jan 1 05:30:00 IST 1970 UPTIME: 00:00:30 LOAD AVERAGE: 0.74, 0.21, 0.07 TASKS: 94 NODENAME: buildroot RELEASE: 6.14.0-rc2+ VERSION: #1 SMP Wed Feb 12 06:49:59 CST 2025 MACHINE: ppc64le (1000 Mhz) MEMORY: 4 GB PANIC: "Kernel panic - not syncing: sysrq triggered crash" PID: 270 COMMAND: "sh" TASK: c000000009e7cc00 [THREAD_INFO: c000000009e7cc00] CPU: 3 STATE: TASK_RUNNING (PANIC) Signed-off-by: Aditya Gupta --- hw/ppc/spapr_rtas.c | 6 +++++- include/hw/ppc/spapr.h | 3 ++- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 0aca4270aee8..bd2ed16a46e3 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -692,7 +692,7 @@ static void trigger_fadump_boot(target_ulong spapr_retcode) } /* Papr Section 7.4.9 ibm,configure-kernel-dump RTAS call */ -static __attribute((unused)) void rtas_configure_kernel_dump(PowerPCCPU *cpu, +static void rtas_configure_kernel_dump(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, target_ulong args, @@ -1109,6 +1109,10 @@ static void core_rtas_register_types(void) spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock", rtas_ibm_nmi_interlock); + /* Register Fadump rtas call */ + spapr_rtas_register(RTAS_CONFIGURE_KERNEL_DUMP, "ibm,configure-kernel-dump", + rtas_configure_kernel_dump); + qtest_set_command_cb(spapr_qtest_callback); } diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index fa63008e57ec..bde3bdc4b80c 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -768,8 +768,9 @@ void push_sregs_to_kvm_pr(SpaprMachineState *spapr); #define RTAS_IBM_SUSPEND_ME (RTAS_TOKEN_BASE + 0x2A) #define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2B) #define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2C) +#define RTAS_CONFIGURE_KERNEL_DUMP (RTAS_TOKEN_BASE + 0x2D) -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2D) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2E) /* Fadump commands */ #define FADUMP_CMD_REGISTER 1