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Wed, 31 Jul 2024 13:22:41 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 472452004B; Wed, 31 Jul 2024 13:22:39 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1E3AD20043; Wed, 31 Jul 2024 13:22:37 +0000 (GMT) Received: from li-3c92a0cc-27cf-11b2-a85c-b804d9ca68fa.in.ibm.com (unknown [9.109.199.72]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 31 Jul 2024 13:22:36 +0000 (GMT) From: Aditya Gupta To: Mahesh J Salgaonkar , Madhavan Srinivasan , Nicholas Piggin , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Harsh Prateek Bora , =?utf-8?b?RnLDqWTDqXJpYyBCYXJy?= =?utf-8?b?YXQ=?= Cc: , Subject: [RFC PATCH] hw/ppc: Implement -dtb support for PowerNV Date: Wed, 31 Jul 2024 18:52:35 +0530 Message-ID: <20240731132235.887918-1-adityag@linux.ibm.com> X-Mailer: git-send-email 2.45.2 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: X6_iEZ2rvcHQfJkDVF3mdy1cTOD3Iy1V X-Proofpoint-GUID: wDCMDeeTJKyPmUQHQsliAGuZJcFEbvLg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-31_08,2024-07-31_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 suspectscore=0 adultscore=0 mlxlogscore=427 impostorscore=0 bulkscore=0 spamscore=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2407310098 Received-SPF: pass client-ip=148.163.158.5; envelope-from=adityag@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Currently any device tree passed with -dtb option in QEMU, was ignored by the PowerNV code. Read and pass the passed -dtb to the kernel, thus enabling easier debugging with custom DTBs. The existing behaviour when -dtb is 'not' passed, is preserved as-is. But when a '-dtb' is passed, it completely overrides any dtb nodes or changes QEMU might have done, such as '-append' arguments to the kernel (which are mentioned in /chosen/bootargs in the dtb), hence add warning when -dtb is being used Signed-off-by: Aditya Gupta --- This is an RFC patch, and hence might not be the final implementation, though this current one is a solution which works --- --- hw/ppc/pnv.c | 29 ++++++++++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-) diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index 3526852685b4..12cc909b9e26 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -714,6 +714,8 @@ static void pnv_reset(MachineState *machine, ShutdownCause reason) PnvMachineState *pnv = PNV_MACHINE(machine); IPMIBmc *bmc; void *fdt; + FILE *fdt_file; + uint32_t fdt_size; qemu_devices_reset(reason); @@ -736,10 +738,31 @@ static void pnv_reset(MachineState *machine, ShutdownCause reason) } } - fdt = pnv_dt_create(machine); + if (machine->dtb) { + warn_report("with manually passed dtb, some options like '-append'" + " might ignored and the dtb passed will be used as-is"); - /* Pack resulting tree */ - _FDT((fdt_pack(fdt))); + fdt = g_malloc0(FDT_MAX_SIZE); + + /* read the file 'machine->dtb', and load it into 'fdt' buffer */ + fdt_file = fopen(machine->dtb, "r"); + if (fdt_file != NULL) { + fdt_size = fread(fdt, sizeof(char), FDT_MAX_SIZE, fdt_file); + if (ferror(fdt_file) != 0) { + error_report("Could not load dtb '%s'", + machine->dtb); + exit(1); + } + + /* mark end of the fdt buffer with '\0' */ + ((char *)fdt)[fdt_size] = '\0'; + } + } else { + fdt = pnv_dt_create(machine); + + /* Pack resulting tree */ + _FDT((fdt_pack(fdt))); + } qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt)); cpu_physical_memory_write(PNV_FDT_ADDR, fdt, fdt_totalsize(fdt));