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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 24 Jan 2020 17:09:02 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00OH916l35914124 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 Jan 2020 17:09:01 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 42AD742041; Fri, 24 Jan 2020 17:09:01 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 433B442045; Fri, 24 Jan 2020 17:08:57 +0000 (GMT) Received: from [9.85.89.94] (unknown [9.85.89.94]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 24 Jan 2020 17:08:57 +0000 (GMT) Subject: Re: [PATCH v4 1/6] libnvdimm/namespace: Make namespace size validation arch dependent To: Dan Williams References: <20200120140749.69549-1-aneesh.kumar@linux.ibm.com> <20200120140749.69549-2-aneesh.kumar@linux.ibm.com> <5fd11235-5f26-b10a-140f-ef24214c85b1@linux.ibm.com> From: "Aneesh Kumar K.V" Date: Fri, 24 Jan 2020 22:38:56 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 20012417-0012-0000-0000-000003805E01 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20012417-0013-0000-0000-000021BCA8DA Message-Id: <6e68989e-2596-6606-c671-ed0725b652f7@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-24_06:2020-01-24,2020-01-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 clxscore=1015 mlxlogscore=763 suspectscore=0 phishscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001240140 Message-ID-Hash: LBYJZROZ7JGREMQLPQFCKDCALXPXKGUP X-Message-ID-Hash: LBYJZROZ7JGREMQLPQFCKDCALXPXKGUP X-MailFrom: aneesh.kumar@linux.ibm.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: linux-nvdimm X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii"; format="flowed" Content-Transfer-Encoding: 7bit On 1/24/20 10:15 PM, Dan Williams wrote: > On Thu, Jan 23, 2020 at 11:34 PM Aneesh Kumar K.V > wrote: >> >> On 1/24/20 11:27 AM, Dan Williams wrote: >>> On Mon, Jan 20, 2020 at 6:08 AM Aneesh Kumar K.V >>> >> >> .... >> >>>> >>>> +unsigned long arch_namespace_map_size(void) >>>> +{ >>>> + return PAGE_SIZE; >>>> +} >>>> +EXPORT_SYMBOL_GPL(arch_namespace_map_size); >>>> + >>>> + >>>> static void __cpa_flush_all(void *arg) >>>> { >>>> unsigned long cache = (unsigned long)arg; >>>> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h >>>> index 9df091bd30ba..a3476dbd2656 100644 >>>> --- a/include/linux/libnvdimm.h >>>> +++ b/include/linux/libnvdimm.h >>>> @@ -284,4 +284,5 @@ static inline void arch_invalidate_pmem(void *addr, size_t size) >>>> } >>>> #endif >>>> >>>> +unsigned long arch_namespace_map_size(void); >>> >>> This property is more generic than the nvdimm namespace mapping size, >>> it's more the fundamental remap granularity that the architecture >>> supports. So I would expect this to be defined in core header files. >>> Something like: >>> >>> diff --git a/include/linux/io.h b/include/linux/io.h >>> index a59834bc0a11..58b3b2091dbb 100644 >>> --- a/include/linux/io.h >>> +++ b/include/linux/io.h >>> @@ -155,6 +155,13 @@ enum { >>> void *memremap(resource_size_t offset, size_t size, unsigned long flags); >>> void memunmap(void *addr); >>> >>> +#ifndef memremap_min_align >>> +static inline unsigned int memremap_min_align(void) >>> +{ >>> + return PAGE_SIZE; >>> +} >>> +#endif >>> + >> >> >> Should that be memremap_pages_min_align()? > > No, and on second look it needs to be a common value that results in > properly aligned / sized namespaces across architectures. > > What would it take for Power to make it's minimum mapping granularity > SUBSECTION_SIZE? The minute that the minimum alignment changes across > architectures we lose compatibility. > > The namespaces need to be sized such that the mode can be changed freely. > We should do a discussion for LSF/MM for architecture compatibility challenges with NVDIMM. I did post a request to attend on that. But never got a response on that submission. -aneesh _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org