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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 21 Feb 2020 03:28:12 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01L3SB5N31981874 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 21 Feb 2020 03:28:11 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3697A52050; Fri, 21 Feb 2020 03:28:11 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 8A24B5204E; Fri, 21 Feb 2020 03:28:10 +0000 (GMT) Received: from adsilva.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id A30CDA03DF; Fri, 21 Feb 2020 14:28:03 +1100 (AEDT) From: "Alastair D'Silva" To: alastair@d-silva.org Cc: "Aneesh Kumar K . V" , "Oliver O'Halloran" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Frederic Barrat , Andrew Donnellan , 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_Go?= =?utf-8?q?ater?= , 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 Subject: [PATCH v3 18/27] powerpc/powernv/pmem: Add controller dump IOCTLs Date: Fri, 21 Feb 2020 14:27:11 +1100 X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200221032720.33893-1-alastair@au1.ibm.com> References: <20200221032720.33893-1-alastair@au1.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 20022103-0016-0000-0000-000002E8CEC4 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022103-0017-0000-0000-0000334BED97 Message-Id: <20200221032720.33893-19-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-20_19:2020-02-19,2020-02-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=80 malwarescore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 bulkscore=0 priorityscore=1501 mlxscore=80 impostorscore=0 suspectscore=1 spamscore=80 mlxlogscore=-58 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002210020 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: From: Alastair D'Silva This patch adds IOCTLs to allow userspace to request & fetch dumps of the internal controller state. This is useful during debugging or when a fatal error on the controller has occurred. Signed-off-by: Alastair D'Silva --- arch/powerpc/platforms/powernv/pmem/ocxl.c | 132 +++++++++++++++++++++ include/uapi/nvdimm/ocxl-pmem.h | 15 +++ 2 files changed, 147 insertions(+) diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c index 2b64504f9129..2cabafe1fc58 100644 --- a/arch/powerpc/platforms/powernv/pmem/ocxl.c +++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c @@ -640,6 +640,124 @@ static int ioctl_error_log(struct ocxlpmem *ocxlpmem, return 0; } +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", + 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); + 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); + + + 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; +} + +static int ioctl_controller_dump_complete(struct ocxlpmem *ocxlpmem) +{ + return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI, + OCXL_LITTLE_ENDIAN, + GLOBAL_MMIO_HCI_CONTROLLER_DUMP_COLLECTED); +} + static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args) { struct ocxlpmem *ocxlpmem = file->private_data; @@ -650,7 +768,21 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args) rc = ioctl_error_log(ocxlpmem, (struct ioctl_ocxl_pmem_error_log __user *)args); break; + + case IOCTL_OCXL_PMEM_CONTROLLER_DUMP: + rc = request_controller_dump(ocxlpmem); + break; + + case IOCTL_OCXL_PMEM_CONTROLLER_DUMP_DATA: + rc = ioctl_controller_dump_data(ocxlpmem, + (struct ioctl_ocxl_pmem_controller_dump_data __user *)args); + break; + + case IOCTL_OCXL_PMEM_CONTROLLER_DUMP_COMPLETE: + rc = ioctl_controller_dump_complete(ocxlpmem); + break; } + return rc; } diff --git a/include/uapi/nvdimm/ocxl-pmem.h b/include/uapi/nvdimm/ocxl-pmem.h index b10f8ac0c20f..d4d8512d03f7 100644 --- a/include/uapi/nvdimm/ocxl-pmem.h +++ b/include/uapi/nvdimm/ocxl-pmem.h @@ -38,9 +38,24 @@ struct ioctl_ocxl_pmem_error_log { __u8 *buf; /* pointer to output buffer */ }; +struct ioctl_ocxl_pmem_controller_dump_data { + __u8 *buf; /* pointer to output buffer */ + __u16 buf_size; /* in/out, buffer size provided/required. + * If required is greater than provided, the buffer + * will be truncated to the amount provided. If its + * less, then only the required bytes will be populated. + * If it is 0, then there is no more dump data available. + */ + __u32 offset; /* in, Offset within the dump */ + __u64 reserved[8]; +}; + /* ioctl numbers */ #define OCXL_PMEM_MAGIC 0x5C /* SCM devices */ #define IOCTL_OCXL_PMEM_ERROR_LOG _IOWR(OCXL_PMEM_MAGIC, 0x01, struct ioctl_ocxl_pmem_error_log) +#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP _IO(OCXL_PMEM_MAGIC, 0x02) +#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_DATA _IOWR(OCXL_PMEM_MAGIC, 0x03, struct ioctl_ocxl_pmem_controller_dump_data) +#define IOCTL_OCXL_PMEM_CONTROLLER_DUMP_COMPLETE _IO(OCXL_PMEM_MAGIC, 0x04) #endif /* _UAPI_OCXL_SCM_H */