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Wed, 31 Jul 2024 20:10:45 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9507620043; Wed, 31 Jul 2024 20:10:43 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2410C20040; Wed, 31 Jul 2024 20:10:41 +0000 (GMT) Received: from li-3c92a0cc-27cf-11b2-a85c-b804d9ca68fa.ibm.com.com (unknown [9.124.222.219]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 31 Jul 2024 20:10:40 +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=?= , =?utf-8?q?Daniel_P=2E_Berrang?= =?utf-8?q?=C3=A9?= Cc: , Subject: [PATCH] hw/ppc: Implement -dtb support for PowerNV Date: Thu, 1 Aug 2024 01:40:39 +0530 Message-ID: <20240731201039.1011028-1-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: ymTmt-txA6aEQR00T32X0zJV662qrluB X-Proofpoint-GUID: XQZjZFLfVi8mVEn0_RAQLmt72x432vQ_ 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_10,2024-07-31_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 priorityscore=1501 mlxscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=912 clxscore=1015 bulkscore=0 adultscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2407310136 Received-SPF: pass client-ip=148.163.156.1; envelope-from=adityag@linux.ibm.com; helo=mx0a-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-ppc@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-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-ppc-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 --- Changelog =========== v1: + use 'g_file_get_contents' and add check for -append & -dtb as suggested by Daniel --- --- hw/ppc/pnv.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index 3526852685b4..03600fa62cbd 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -736,10 +736,21 @@ 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'" + " will get ignored and the dtb passed will be used as-is"); - /* Pack resulting tree */ - _FDT((fdt_pack(fdt))); + /* read the file 'machine->dtb', and load it into 'fdt' buffer */ + if (!g_file_get_contents(machine->dtb, (gchar **)&fdt, NULL, NULL)) { + error_report("Could not load dtb '%s'", machine->dtb); + exit(1); + } + } 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)); @@ -952,6 +963,14 @@ static void pnv_init(MachineState *machine) g_free(sz); exit(EXIT_FAILURE); } + + /* checks for invalid option combinations */ + if (machine->dtb && (strlen(machine->kernel_cmdline) != 0)) { + error_report("-append and -dtb cannot be used together, as passed" + " command line is ignored in case of custom dtb"); + exit(EXIT_FAILURE); + } + memory_region_add_subregion(get_system_memory(), 0, machine->ram); /*