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Tue, 5 Dec 2023 20:18:42 +0000 (GMT) From: Hari Bathini To: linuxppc-dev Subject: [RFC PATCH 3/3] powerpc/fadump: pass additional parameters when fadump is active Date: Wed, 6 Dec 2023 01:48:35 +0530 Message-ID: <20231205201835.388030-4-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231205201835.388030-1-hbathini@linux.ibm.com> References: <20231205201835.388030-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: N280NqocDSvJ6T9BDPMoRnQ-o4cJRuyL X-Proofpoint-GUID: N280NqocDSvJ6T9BDPMoRnQ-o4cJRuyL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-05_16,2023-12-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 spamscore=0 impostorscore=0 priorityscore=1501 mlxlogscore=935 malwarescore=0 bulkscore=0 suspectscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312050161 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mahesh J Salgaonkar , Sourabh Jain Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Append the additional parameters passed/set in the dedicated parameter area (RTAS_FADUMP_PARAM_AREA) to bootargs in fadump capture kernel. Signed-off-by: Hari Bathini --- arch/powerpc/include/asm/fadump.h | 2 ++ arch/powerpc/kernel/fadump.c | 34 +++++++++++++++++++++++++++++++ arch/powerpc/kernel/prom.c | 3 +++ 3 files changed, 39 insertions(+) diff --git a/arch/powerpc/include/asm/fadump.h b/arch/powerpc/include/asm/fadump.h index 526a6a647312..ef40c9b6972a 100644 --- a/arch/powerpc/include/asm/fadump.h +++ b/arch/powerpc/include/asm/fadump.h @@ -19,12 +19,14 @@ extern int is_fadump_active(void); extern int should_fadump_crash(void); extern void crash_fadump(struct pt_regs *, const char *); extern void fadump_cleanup(void); +extern void fadump_append_bootargs(void); #else /* CONFIG_FA_DUMP */ static inline int is_fadump_active(void) { return 0; } static inline int should_fadump_crash(void) { return 0; } static inline void crash_fadump(struct pt_regs *regs, const char *str) { } static inline void fadump_cleanup(void) { } +static inline void fadump_append_bootargs(void) { } #endif /* !CONFIG_FA_DUMP */ #if defined(CONFIG_FA_DUMP) || defined(CONFIG_PRESERVE_FA_DUMP) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 98f089747ac9..9b1601f99f72 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -133,6 +133,40 @@ static int __init fadump_cma_init(void) static int __init fadump_cma_init(void) { return 1; } #endif /* CONFIG_CMA */ +/* + * Additional parameters meant for capture kernel are placed in a dedicated area. + * If this is capture kernel boot, append these parameters to bootargs. + */ +void __init fadump_append_bootargs(void) +{ + char *append_args; + size_t len; + + if (!fw_dump.dump_active || !fw_dump.param_area_supported || !fw_dump.param_area) + return; + + /* TODO: What to do if this overlaps with reserve area (radix case?) */ + if (memblock_reserve(fw_dump.param_area, COMMAND_LINE_SIZE)) { + pr_warn("WARNING: Can't use additional parameters area!\n"); + fw_dump.param_area = 0; + return; + } + + append_args = (char *)fw_dump.param_area; + len = strlen(boot_command_line); + + /* + * Too late to fail even if cmdline size exceeds. Truncate additional parameters + * to cmdline size and proceed anyway. + */ + if (len + strlen(append_args) >= COMMAND_LINE_SIZE - 1) + pr_warn("WARNING: Appending parameters exceeds cmdline size. Truncating!\n"); + + pr_debug("Cmdline: %s\n", boot_command_line); + snprintf(boot_command_line + len, COMMAND_LINE_SIZE - len, " %s", append_args); + pr_info("Updated cmdline: %s\n", boot_command_line); +} + /* Scan the Firmware Assisted dump configuration details. */ int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, int depth, void *data) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 0b5878c3125b..00a03d476cb9 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -791,6 +791,9 @@ void __init early_init_devtree(void *params) */ of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line); + /* Append additional parameters passed for fadump capture kernel */ + fadump_append_bootargs(); + /* Scan memory nodes and rebuild MEMBLOCKs */ early_init_dt_scan_root(); early_init_dt_scan_memory_ppc();