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Fri, 18 Sep 2026 05:23:43 +0000 (GMT) Received: from li-d12addcc-2792-11b2-a85c-bd8df30615ab.ibm.com.com (unknown [9.66.68.7]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 18 Sep 2026 05:23:42 +0000 (GMT) From: Shirisha G To: linuxppc-dev@lists.ozlabs.org Cc: linux-kselftest@vger.kernel.org, maddy@linux.ibm.com, venkat88@linux.ibm.com, shirisha@linux.ibm.com Subject: [PATCH 4/7] Subject: [PATCH] selftests/powerpc: Add FADump sysfs interface test Date: Fri, 18 Sep 2026 10:52:39 +0530 Message-ID: <20260918052321.932660-4-shirisha@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260918052321.932660-1-shirisha@linux.ibm.com> References: <20260918052321.932660-1-shirisha@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE4MDA2NCBTYWx0ZWRfX1RG4QbLFRFNR OQ3sJat1TO41CGCPkiYLdBz0HdL87IMSKIGSXA1aTpPgxHD2McVwiP1pJzPe9eBtH0ONLthRHXa xBMiBif/dL1I47+b0Q4rOtbEiI4HextZbeGEMDHx4xjfkMbaLVedNle6FGrSj2uXu4VeCTvyV7U 4OxXJWbGjk1C3Rp2SYRpCEMgs4uwqecUpvVBUcrUxpV7zCuQ0as/SWTHlTP6QkBaEtgv4PBCtJE F6ecz+6wR5CnE7c4fDD6r9tC+e9vsbAXYKA7SMod6f5GZ1msQc2xOgc+naobbidzErxOA9ogq7L EgndlswzkuHK4HQxPAc1iNg7MV2oUcirr4l2VbxioUjdz75gqfHxUZGYGoo/bhco45M4IHUyM7v 0xbh1JaYBrdTdKGt49bJwsd/WuC1rAdl6E3ojbqP0FHDOGnt2qOJmvQ7Y94YdwGIHGJL78Fbw1W Cw9a92Z+y09+iTizHaQ== X-Proofpoint-GUID: WW4JiwzK5H7uMEayfy9ypoIb9EqfOSXj X-Authority-Analysis: v=2.4 cv=DobDa2/+ c=1 sm=1 tr=0 ts=6aaccae8 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=CXm9OyrhO1pcemlAit0A:9 X-Proofpoint-ORIG-GUID: WW4JiwzK5H7uMEayfy9ypoIb9EqfOSXj X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE4MDA2NCBTYWx0ZWRfX3aVYi9fBSSjg 39bL6tbNp7sC+26GX1dYYLpw3MTgCiaFBCbi03Unn/w4qoA3cdDu6JcUGc9/MRsAXUVzM2x3rCq Y5RELyDexSSbkVnDWwlEK+IhMeT3MiI= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-18_01,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 impostorscore=0 spamscore=0 clxscore=1015 adultscore=0 bulkscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609180064 Add kselftest for Firmware-Assisted Dump (FADump) sysfs interface on pseries/PowerVM systems. This test validates registration and status reporting without triggering an actual crash. The test verifies: - Existence of `/sys/kernel/fadump/` directory - Reading enabled and registered status - Reserved memory size is non-zero when enabled - Attribute readability and permissions - Handling of invalid registration attempts Signed-off-by: Shirisha G --- .../selftests/powerpc/rtas/fadump_test.c | 85 +++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 tools/testing/selftests/powerpc/rtas/fadump_test.c diff --git a/tools/testing/selftests/powerpc/rtas/fadump_test.c b/tools/testing/selftests/powerpc/rtas/fadump_test.c new file mode 100644 index 000000000000..92ff70e4b580 --- /dev/null +++ b/tools/testing/selftests/powerpc/rtas/fadump_test.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Firmware-Assisted Dump (FADump) Test + * Copyright (C) 2026 IBM Corporation + */ + +#include +#include +#include +#include +#include +#include "utils.h" + +#define FADUMP_DIR "/sys/kernel/fadump" +#define FADUMP_ENABLED "/sys/kernel/fadump/enabled" +#define FADUMP_REGISTERED "/sys/kernel/fadump/registered" +#define FADUMP_MEM_RESERVED "/sys/kernel/fadump/mem_reserved" +#define FADUMP_REGISTER "/sys/kernel/fadump/fadump_register" + +static int read_sysfs_int(const char *path) +{ + FILE *fp; + int value = -1; + + fp = fopen(path, "r"); + if (fp) { + fscanf(fp, "%d", &value); + fclose(fp); + } + return value; +} + +static unsigned long read_sysfs_ulong(const char *path) +{ + FILE *fp; + unsigned long value = 0; + + fp = fopen(path, "r"); + if (fp) { + fscanf(fp, "%lu", &value); + fclose(fp); + } + return value; +} + +int main(void) +{ + int enabled, registered; + unsigned long mem_reserved; + + test_harness_set_timeout(10); + + /* Test 1: Verify FADump sysfs directory exists */ + SKIP_IF(access(FADUMP_DIR, R_OK) != 0); + + /* Test 2: Read enabled status */ + enabled = read_sysfs_int(FADUMP_ENABLED); + FAIL_IF_MSG(enabled < 0, "Failed to read FADump enabled status"); + printf("FADump enabled: %d\n", enabled); + + /* Test 3: Read registered status */ + registered = read_sysfs_int(FADUMP_REGISTERED); + FAIL_IF_MSG(registered < 0, "Failed to read FADump registered status"); + printf("FADump registered: %d\n", registered); + + /* Test 4: Read reserved memory */ + mem_reserved = read_sysfs_ulong(FADUMP_MEM_RESERVED); + printf("FADump reserved memory: %lu bytes\n", mem_reserved); + + if (enabled) { + FAIL_IF_MSG(mem_reserved == 0, + "FADump enabled but no memory reserved"); + } + + /* Test 5: Verify sysfs attributes are readable */ + FAIL_IF(access(FADUMP_ENABLED, R_OK) != 0); + FAIL_IF(access(FADUMP_REGISTERED, R_OK) != 0); + FAIL_IF(access(FADUMP_MEM_RESERVED, R_OK) != 0); + + /* Note: We don't test actual registration/unregistration here + * as it requires root and could affect system stability */ + + printf("FADump test passed\n"); + return 0; +} -- 2.43.5