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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 4 Mar 2020 06:53:12 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0246qDVG43975134 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 4 Mar 2020 06:52:13 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C3E04C059; Wed, 4 Mar 2020 06:53:11 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CE9434C04A; Wed, 4 Mar 2020 06:53:10 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 4 Mar 2020 06:53:10 +0000 (GMT) Received: from [10.61.2.125] (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id A6CBDA023A; Wed, 4 Mar 2020 17:53:05 +1100 (AEDT) Subject: Re: [PATCH v3 18/27] powerpc/powernv/pmem: Add controller dump IOCTLs To: "Alastair D'Silva" , alastair@d-silva.org Cc: "Aneesh Kumar K . V" , "Oliver O'Halloran" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Frederic Barrat , Arnd Bergmann , Greg Kroah-Hartman , Dan Williams , Vishal Verma , Dave Jiang , Ira Weiny , Andrew Morton , Mauro Carvalho Chehab , "David S. Miller" , Rob Herring , Anton Blanchard , Krzysztof Kozlowski , Mahesh Salgaonkar , Madhavan Srinivasan , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= , Anju T Sudhakar , Hari Bathini , Thomas Gleixner , Greg Kurz , Nicholas Piggin , Masahiro Yamada , Alexey Kardashevskiy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org, linux-mm@kvack.org References: <20200221032720.33893-1-alastair@au1.ibm.com> <20200221032720.33893-19-alastair@au1.ibm.com> From: Andrew Donnellan Date: Wed, 4 Mar 2020 17:53:09 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200221032720.33893-19-alastair@au1.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20030406-0012-0000-0000-0000038CFCD6 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20030406-0013-0000-0000-000021C9B5FE Message-Id: <7fc5ee46-d849-11f1-d0ad-429a8c87d7eb@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-03-03_08:2020-03-03,2020-03-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 clxscore=1015 mlxlogscore=937 impostorscore=0 malwarescore=0 adultscore=0 phishscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003040052 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 21/2/20 2:27 pm, Alastair D'Silva wrote: > +static int ioctl_controller_dump_data(struct ocxlpmem *ocxlpmem, > + struct ioctl_ocxl_pmem_controller_dump_data __user *uarg) > +{ > + struct ioctl_ocxl_pmem_controller_dump_data args; > + u16 i; > + u64 val; > + int rc; > + > + if (copy_from_user(&args, uarg, sizeof(args))) > + return -EFAULT; > + > + if (args.buf_size % 8) > + return -EINVAL; > + > + if (args.buf_size > ocxlpmem->admin_command.data_size) > + return -EINVAL; > + > + mutex_lock(&ocxlpmem->admin_command.lock); > + > + rc = admin_command_request(ocxlpmem, ADMIN_COMMAND_CONTROLLER_DUMP); > + if (rc) > + goto out; > + > + val = ((u64)args.offset) << 32; > + val |= args.buf_size; > + rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.request_offset + 0x08, > + OCXL_LITTLE_ENDIAN, val); > + if (rc) > + goto out; > + > + rc = admin_command_execute(ocxlpmem); > + if (rc) > + goto out; > + > + rc = admin_command_complete_timeout(ocxlpmem, > + ADMIN_COMMAND_CONTROLLER_DUMP); > + if (rc < 0) { > + dev_warn(&ocxlpmem->dev, "Controller dump timed out\n"); > + goto out; > + } > + > + rc = admin_response(ocxlpmem); > + if (rc < 0) > + goto out; > + if (rc != STATUS_SUCCESS) { > + warn_status(ocxlpmem, > + "Unexpected status from retrieve error log", Controller dump > + rc); > + goto out; > + } > + > + for (i = 0; i < args.buf_size; i += 8) { > + u64 val; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + i, > + OCXL_HOST_ENDIAN, &val); Is a controller dump something where we want to do endian swapping? Any reason we're not doing the usual check of the data identifier, additional data length etc? > + if (rc) > + goto out; > + > + if (copy_to_user(&args.buf[i], &val, sizeof(u64))) { > + rc = -EFAULT; > + goto out; > + } > + } > + > + if (copy_to_user(uarg, &args, sizeof(args))) { > + rc = -EFAULT; > + goto out; > + } > + > + rc = admin_response_handled(ocxlpmem); > + if (rc) > + goto out; > + > +out: > + mutex_unlock(&ocxlpmem->admin_command.lock); > + return rc; > +} > + > +int request_controller_dump(struct ocxlpmem *ocxlpmem) > +{ > + int rc; > + u64 busy = 1; > + > + rc = ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHIC, > + OCXL_LITTLE_ENDIAN, > + GLOBAL_MMIO_CHI_CDA); This return code is ignored > + > + > + rc = ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI, > + OCXL_LITTLE_ENDIAN, > + GLOBAL_MMIO_HCI_CONTROLLER_DUMP); > + if (rc) > + return rc; > + > + while (busy) { > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + GLOBAL_MMIO_HCI, > + OCXL_LITTLE_ENDIAN, &busy); > + if (rc) > + return rc; > + > + busy &= GLOBAL_MMIO_HCI_CONTROLLER_DUMP; > + cond_resched(); > + } > + > + return 0; > +} -- Andrew Donnellan OzLabs, ADL Canberra ajd@linux.ibm.com IBM Australia Limited