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Fri, 14 Mar 2025 13:56:43 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 52EDubg758917272 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 14 Mar 2025 13:56:37 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C078420043; Fri, 14 Mar 2025 13:56:37 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9066220040; Fri, 14 Mar 2025 13:56:32 +0000 (GMT) Received: from localhost.localdomain (unknown [9.61.242.102]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 14 Mar 2025 13:56:32 +0000 (GMT) From: Athira Rajeev To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: atrajeev@linux.ibm.com, disgoel@linux.vnet.ibm.com, hbathini@linux.vnet.ibm.com, Aditya.Bodkhe1@ibm.com, adubey@linux.ibm.com, skb99@linux.ibm.com, sshegde@linux.ibm.com, riteshh@linux.ibm.com, Tejas.Manhas1@ibm.com Subject: [PATCH 8/9] powerpc/pseries/htmdump: Add htm capabilities support to htmdump module Date: Fri, 14 Mar 2025 19:25:40 +0530 Message-Id: <20250314135541.1831-9-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250314135541.1831-1-atrajeev@linux.ibm.com> References: <20250314135541.1831-1-atrajeev@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: dYMgMJoAs7sY6tr_9OhTB1XWGVRDbfyZ X-Proofpoint-ORIG-GUID: dYMgMJoAs7sY6tr_9OhTB1XWGVRDbfyZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-14_05,2025-03-14_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 impostorscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0 clxscore=1015 spamscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503140110 Support dumping HTM capabilities information from Hardware Trace Macro (HTM) function via debugfs interface. Under debugfs folder "/sys/kernel/debug/powerpc/htmdump", add file "htmcaps”. The interface allows only read of this file which will present the content of HTM buffer from the hcall. Signed-off-by: Athira Rajeev --- arch/powerpc/platforms/pseries/htmdump.c | 38 ++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/arch/powerpc/platforms/pseries/htmdump.c b/arch/powerpc/platforms/pseries/htmdump.c index 0b3bed738db5..3d30af0304d6 100644 --- a/arch/powerpc/platforms/pseries/htmdump.c +++ b/arch/powerpc/platforms/pseries/htmdump.c @@ -14,6 +14,7 @@ static void *htm_buf; static void *htm_status_buf; static void *htm_info_buf; +static void *htm_caps_buf; static u32 nodeindex; static u32 nodalchipindex; static u32 coreindexonchip; @@ -290,12 +291,41 @@ static ssize_t htminfo_read(struct file *filp, char __user *ubuf, return simple_read_from_buffer(ubuf, count, ppos, htm_info_buf, to_copy); } +static ssize_t htmcaps_read(struct file *filp, char __user *ubuf, + size_t count, loff_t *ppos) +{ + void *htm_caps_buf = filp->private_data; + long rc, ret; + + /* + * Invoke H_HTM call with: + * - operation as htm capabilities (H_HTM_OP_CAPABILITIES) + * - last three values as addr, size (0x80 for Capabilities Output Buffer + * and zero + */ + rc = htm_hcall_wrapper(htmflags, nodeindex, nodalchipindex, coreindexonchip, + htmtype, H_HTM_OP_CAPABILITIES, virt_to_phys(htm_caps_buf), + 0x80, 0); + + ret = htm_return_check(rc); + if (ret <= 0) + return ret; + + return simple_read_from_buffer(ubuf, count, ppos, htm_caps_buf, 0x80); +} + static const struct file_operations htminfo_fops = { .llseek = NULL, .read = htminfo_read, .open = simple_open, }; +static const struct file_operations htmcaps_fops = { + .llseek = NULL, + .read = htmcaps_read, + .open = simple_open, +}; + static int htmsetup_set(void *data, u64 val) { long rc, ret; @@ -401,8 +431,16 @@ static int htmdump_init_debugfs(void) return -ENOMEM; } + /* Debugfs interface file to present HTM capabilities */ + htm_caps_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!htm_caps_buf) { + pr_err("Failed to allocate htm caps buf\n"); + return -ENOMEM; + } + debugfs_create_file("htmstatus", 0400, htmdump_debugfs_dir, htm_status_buf, &htmstatus_fops); debugfs_create_file("htminfo", 0400, htmdump_debugfs_dir, htm_info_buf, &htminfo_fops); + debugfs_create_file("htmcaps", 0400, htmdump_debugfs_dir, htm_caps_buf, &htmcaps_fops); return 0; } -- 2.43.5