tegra: hwpm: add debugfs node to skip alist

Currently, HWPM driver checks regops address to validate that the
address belongs to an IP allowlist that is reserved for profiling.
However, it is possible that the allowlist doesn't include all register
offset that are required for profiling. This scenario is often
encountered during early stages of bringup. This patch adds a debugfs
node to make HWPM driver skip allowlist check. This change will allow
users to dynamically skip allowlist check when debugfs is available.

JIRA THWPM-65

Change-Id: Ic85a1c7fac6a95f7cde532f3bdf6040bbcc7f5f3
Signed-off-by: Vedashree Vidwans <vvidwans@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-hwpm/+/3241080
Reviewed-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-by: Vasuki Shankar <vasukis@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: Vasuki Shankar <vasukis@nvidia.com>

drivers/tegra/hwpm/common/init.c

@@ -132,6 +132,7 @@ int tegra_hwpm_init_sw_components(struct tegra_soc_hwpm *hwpm,
 	tegra_hwpm_fn(hwpm, " ");
 
 	hwpm->dbg_mask = TEGRA_HWPM_DEFAULT_DBG_MASK;
+	hwpm->dbg_skip_alist = false;
 
 	err = tegra_hwpm_init_chip_ip_structures(hwpm, chip_id, chip_id_rev);
 	if (err != 0) {

drivers/tegra/hwpm/common/ip.c

@@ -369,6 +369,14 @@ static bool tegra_hwpm_addr_in_single_element(struct tegra_soc_hwpm *hwpm,
 			"a_type %d s_element_idx %d address not in alist",
 			*ip_idx, (unsigned long long)find_addr,
 			*s_inst_idx, a_type, *s_element_idx);
+
+		if (hwpm->dbg_skip_alist) {
+			*element_type = element->element_type;
+			tegra_hwpm_dbg(hwpm, hwpm_dbg_regops,
+				"skipping allowlist check");
+			return true;
+		}
+
 		return false;
 	}
 

drivers/tegra/hwpm/include/tegra_hwpm.h

@@ -623,6 +623,7 @@ struct tegra_soc_hwpm {
 	bool bind_completed;
 	bool device_opened;
 	bool fake_registers_enabled;
+	bool dbg_skip_alist;
 };
 
 #endif /* TEGRA_HWPM_H */

drivers/tegra/hwpm/os/linux/debugfs.c

@@ -1,18 +1,18 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2021-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+* SPDX-FileCopyrightText: Copyright (c) 2021-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
- *
+*
- * This program is free software; you can redistribute it and/or modify it
+* This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
+* under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
+* version 2, as published by the Free Software Foundation.
- *
+*
- * This program is distributed in the hope it will be useful, but WITHOUT
+* This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
+* more details.
- * You should have received a copy of the GNU General Public License
+* You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
+* along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
+*/
 
 #include <linux/debugfs.h>
 
@@ -42,6 +42,10 @@ void tegra_hwpm_debugfs_init(struct tegra_hwpm_os_linux *hwpm_linux)
 	debugfs_create_u32("log_mask", S_IRUGO|S_IWUSR,
 		hwpm_linux->debugfs_root, &hwpm->dbg_mask);
 
+	/* Skip allowlist check */
+	debugfs_create_bool("skip_allowlist", S_IRUGO|S_IWUSR,
+		hwpm_linux->debugfs_root, &hwpm->dbg_skip_alist);
+
 	return;
 
 fail: