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Tue, 1 Aug 2023 04:44:59 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7CA415804B; Tue, 1 Aug 2023 04:44:56 +0000 (GMT) Received: from skywalker.in.ibm.com (unknown [9.109.212.144]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 1 Aug 2023 04:44:56 +0000 (GMT) From: "Aneesh Kumar K.V" To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu Subject: [PATCH v4 2/2] powerpc/mm: Add memory_block_size as a kernel parameter Date: Tue, 1 Aug 2023 10:14:47 +0530 Message-ID: <20230801044447.11275-2-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801044447.11275-1-aneesh.kumar@linux.ibm.com> References: <20230801044447.11275-1-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Re7-zOqV-TUzUSAbGbnQFFqPj74kazfF X-Proofpoint-ORIG-GUID: 35RZ3Y503wsZsP3YNOHqWV8-A4oLUBgl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-01_02,2023-07-31_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 mlxscore=0 spamscore=0 clxscore=1015 impostorscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308010041 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , foraker1@llnl.gov, Reza Arbab Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Certain devices can possess non-standard memory capacities, not constrained to multiples of 1GB. Provide a kernel parameter so that we can map the device memory completely on memory hotplug. Restrict memory_block_size value to a power of 2 value similar to LMB size. The memory block size should also be more than the section size. Reviewed-by: Reza Arbab Signed-off-by: Aneesh Kumar K.V --- .../admin-guide/kernel-parameters.txt | 3 +++ arch/powerpc/kernel/setup_64.c | 23 +++++++++++++++++++ arch/powerpc/mm/init_64.c | 17 ++++++++++---- 3 files changed, 38 insertions(+), 5 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a1457995fd41..4e49696e0976 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3201,6 +3201,9 @@ Note that even when enabled, there are a few cases where the feature is not effective. + memory_block_size=size [PPC] + Use this parameter to configure the memory block size value. + memtest= [KNL,X86,ARM,M68K,PPC,RISCV] Enable memtest Format: default : 0 diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 246201d0d879..cbdb924462c7 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -892,6 +892,29 @@ unsigned long memory_block_size_bytes(void) return MIN_MEMORY_BLOCK_SIZE; } + +/* + * Restrict to a power of 2 value for memblock which is larger than + * section size + */ +static int __init parse_mem_block_size(char *ptr) +{ + unsigned int order; + unsigned long size = memparse(ptr, NULL); + + order = fls64(size); + if (!order) + return 0; + + order--; + if (order < SECTION_SIZE_BITS) + return 0; + + memory_block_size = 1UL << order; + + return 0; +} +early_param("memory_block_size", parse_mem_block_size); #endif #if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO) diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index d74d4a441616..fcda46c2b8df 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -566,13 +566,20 @@ static int __init probe_memory_block_size(unsigned long node, const char *uname, return 0; } -/* - * start with 1G memory block size. Early init will - * fix this with correct value. - */ -unsigned long memory_block_size __ro_after_init = 1UL << 30; +unsigned long memory_block_size __ro_after_init; static void __init early_init_memory_block_size(void) { + /* + * if it is set via early param just return. + */ + if (memory_block_size) + return; + + /* + * start with 1G memory block size. update_memory_block_size() + * will derive the right value based on device tree details. + */ + memory_block_size = SZ_1G; /* * We need to do memory_block_size probe early so that * radix__early_init_mmu() can use this as limit for