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Thu, 23 Jan 2025 11:43:06 +0000 Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 50NBh2Pj55968128 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 23 Jan 2025 11:43:02 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C46822004B; Thu, 23 Jan 2025 11:43:02 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B841320040; Thu, 23 Jan 2025 11:43:00 +0000 (GMT) Received: from li-4f5ba44c-27d4-11b2-a85c-a08f5b49eada.in.ibm.com (unknown [9.109.204.94]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 23 Jan 2025 11:43:00 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@lists.ozlabs.org Cc: Sourabh Jain , Avnish Chouhan , Brian King , Hari Bathini , Madhavan Srinivasan , Michael Ellerman , Mahesh Salgaonkar Subject: [PATCH v3 1/4] powerpc: export MIN RMA size Date: Thu, 23 Jan 2025 17:12:51 +0530 Message-ID: <20250123114254.200527-2-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250123114254.200527-1-sourabhjain@linux.ibm.com> References: <20250123114254.200527-1-sourabhjain@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 41afIUfXRM7jMfDGLomxAvx4YR_FvTaq X-Proofpoint-ORIG-GUID: 41afIUfXRM7jMfDGLomxAvx4YR_FvTaq 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=2025-01-23_05,2025-01-22_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 impostorscore=0 adultscore=0 clxscore=1015 bulkscore=0 suspectscore=0 mlxlogscore=711 phishscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501230087 Commit 683eab94da75bc ("powerpc/fadump: setup additional parameters for dump capture kernel") introduced the additional parameter feature in fadump for HASH MMU with the understanding that GRUB does not use the memory area between 640MB and 768MB for its operation. However, the third patch ("powerpc: increase MIN RMA size for CAS negotiation") in this series is changing the MIN RMA size to 768MB, allowing GRUB to use memory up to 768MB. This makes the fadump reservation for the additional parameter feature for HASH MMU unreliable. To address this, export the MIN_RMA so that the next patch ("powerpc/fadump: fix additional param memory reservation for HASH MMU") can identify the correct memory range for the additional parameter feature in fadump for HASH MMU. Cc: Avnish Chouhan Cc: Brian King Cc: Hari Bathini Cc: Madhavan Srinivasan Cc: Michael Ellerman Reviewed-by: Mahesh Salgaonkar Signed-off-by: Sourabh Jain --- arch/powerpc/include/asm/prom.h | 2 ++ arch/powerpc/kernel/prom_init.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h index c0107d8ddd8c..b4e504b914e4 100644 --- a/arch/powerpc/include/asm/prom.h +++ b/arch/powerpc/include/asm/prom.h @@ -17,6 +17,8 @@ struct device_node; struct property; +#define MIN_RMA 512 /* Minimum RMA (in MB) for CAS negotiation */ + #define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */ #define OF_DT_END_NODE 0x2 /* End node */ #define OF_DT_PROP 0x3 /* Property: name off, size, diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 8e776ba39497..7daecf1b7c16 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -1061,7 +1061,7 @@ static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = { .virt_base = cpu_to_be32(0xffffffff), .virt_size = cpu_to_be32(0xffffffff), .load_base = cpu_to_be32(0xffffffff), - .min_rma = cpu_to_be32(512), /* 512MB min RMA */ + .min_rma = cpu_to_be32(MIN_RMA), .min_load = cpu_to_be32(0xffffffff), /* full client load */ .min_rma_percent = 0, /* min RMA percentage of total RAM */ .max_pft_size = 48, /* max log_2(hash table size) */ -- 2.48.1