1f4344b19SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 28f95faaaSMadhavan Srinivasan /* 38f95faaaSMadhavan Srinivasan * OPAL IMC interface detection driver 48f95faaaSMadhavan Srinivasan * Supported on POWERNV platform 58f95faaaSMadhavan Srinivasan * 68f95faaaSMadhavan Srinivasan * Copyright (C) 2017 Madhavan Srinivasan, IBM Corporation. 78f95faaaSMadhavan Srinivasan * (C) 2017 Anju T Sudhakar, IBM Corporation. 88f95faaaSMadhavan Srinivasan * (C) 2017 Hemant K Shaw, IBM Corporation. 98f95faaaSMadhavan Srinivasan */ 108f95faaaSMadhavan Srinivasan #include <linux/kernel.h> 118f95faaaSMadhavan Srinivasan #include <linux/platform_device.h> 128f95faaaSMadhavan Srinivasan #include <linux/of.h> 138f95faaaSMadhavan Srinivasan #include <linux/of_address.h> 148f95faaaSMadhavan Srinivasan #include <linux/of_platform.h> 158f95faaaSMadhavan Srinivasan #include <linux/crash_dump.h> 168f95faaaSMadhavan Srinivasan #include <asm/opal.h> 178f95faaaSMadhavan Srinivasan #include <asm/io.h> 188f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 198f95faaaSMadhavan Srinivasan #include <asm/cputhreads.h> 20684d9840SAnju T Sudhakar #include <asm/debugfs.h> 21684d9840SAnju T Sudhakar 22684d9840SAnju T Sudhakar static struct dentry *imc_debugfs_parent; 23684d9840SAnju T Sudhakar 24684d9840SAnju T Sudhakar /* Helpers to export imc command and mode via debugfs */ 25684d9840SAnju T Sudhakar static int imc_mem_get(void *data, u64 *val) 26684d9840SAnju T Sudhakar { 27684d9840SAnju T Sudhakar *val = cpu_to_be64(*(u64 *)data); 28684d9840SAnju T Sudhakar return 0; 29684d9840SAnju T Sudhakar } 30684d9840SAnju T Sudhakar 31684d9840SAnju T Sudhakar static int imc_mem_set(void *data, u64 val) 32684d9840SAnju T Sudhakar { 33684d9840SAnju T Sudhakar *(u64 *)data = cpu_to_be64(val); 34684d9840SAnju T Sudhakar return 0; 35684d9840SAnju T Sudhakar } 36684d9840SAnju T Sudhakar DEFINE_DEBUGFS_ATTRIBUTE(fops_imc_x64, imc_mem_get, imc_mem_set, "0x%016llx\n"); 37684d9840SAnju T Sudhakar 38684d9840SAnju T Sudhakar static struct dentry *imc_debugfs_create_x64(const char *name, umode_t mode, 39684d9840SAnju T Sudhakar struct dentry *parent, u64 *value) 40684d9840SAnju T Sudhakar { 41684d9840SAnju T Sudhakar return debugfs_create_file_unsafe(name, mode, parent, 42684d9840SAnju T Sudhakar value, &fops_imc_x64); 43684d9840SAnju T Sudhakar } 44684d9840SAnju T Sudhakar 45684d9840SAnju T Sudhakar /* 46684d9840SAnju T Sudhakar * export_imc_mode_and_cmd: Create a debugfs interface 47684d9840SAnju T Sudhakar * for imc_cmd and imc_mode 48684d9840SAnju T Sudhakar * for each node in the system. 49684d9840SAnju T Sudhakar * imc_mode and imc_cmd can be changed by echo into 50684d9840SAnju T Sudhakar * this interface. 51684d9840SAnju T Sudhakar */ 52684d9840SAnju T Sudhakar static void export_imc_mode_and_cmd(struct device_node *node, 53684d9840SAnju T Sudhakar struct imc_pmu *pmu_ptr) 54684d9840SAnju T Sudhakar { 55684d9840SAnju T Sudhakar static u64 loc, *imc_mode_addr, *imc_cmd_addr; 56684d9840SAnju T Sudhakar int chip = 0, nid; 57684d9840SAnju T Sudhakar char mode[16], cmd[16]; 58684d9840SAnju T Sudhakar u32 cb_offset; 59684d9840SAnju T Sudhakar 60684d9840SAnju T Sudhakar imc_debugfs_parent = debugfs_create_dir("imc", powerpc_debugfs_root); 61684d9840SAnju T Sudhakar 62684d9840SAnju T Sudhakar /* 63684d9840SAnju T Sudhakar * Return here, either because 'imc' directory already exists, 64684d9840SAnju T Sudhakar * Or failed to create a new one. 65684d9840SAnju T Sudhakar */ 66684d9840SAnju T Sudhakar if (!imc_debugfs_parent) 67684d9840SAnju T Sudhakar return; 68684d9840SAnju T Sudhakar 69684d9840SAnju T Sudhakar if (of_property_read_u32(node, "cb_offset", &cb_offset)) 70684d9840SAnju T Sudhakar cb_offset = IMC_CNTL_BLK_OFFSET; 71684d9840SAnju T Sudhakar 72684d9840SAnju T Sudhakar for_each_node(nid) { 73684d9840SAnju T Sudhakar loc = (u64)(pmu_ptr->mem_info[chip].vbase) + cb_offset; 74684d9840SAnju T Sudhakar imc_mode_addr = (u64 *)(loc + IMC_CNTL_BLK_MODE_OFFSET); 75684d9840SAnju T Sudhakar sprintf(mode, "imc_mode_%d", nid); 76684d9840SAnju T Sudhakar if (!imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent, 77684d9840SAnju T Sudhakar imc_mode_addr)) 78684d9840SAnju T Sudhakar goto err; 79684d9840SAnju T Sudhakar 80684d9840SAnju T Sudhakar imc_cmd_addr = (u64 *)(loc + IMC_CNTL_BLK_CMD_OFFSET); 81684d9840SAnju T Sudhakar sprintf(cmd, "imc_cmd_%d", nid); 82684d9840SAnju T Sudhakar if (!imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent, 83684d9840SAnju T Sudhakar imc_cmd_addr)) 84684d9840SAnju T Sudhakar goto err; 85684d9840SAnju T Sudhakar chip++; 86684d9840SAnju T Sudhakar } 87684d9840SAnju T Sudhakar return; 88684d9840SAnju T Sudhakar 89684d9840SAnju T Sudhakar err: 90684d9840SAnju T Sudhakar debugfs_remove_recursive(imc_debugfs_parent); 91684d9840SAnju T Sudhakar } 928f95faaaSMadhavan Srinivasan 938f95faaaSMadhavan Srinivasan /* 948f95faaaSMadhavan Srinivasan * imc_get_mem_addr_nest: Function to get nest counter memory region 958f95faaaSMadhavan Srinivasan * for each chip 968f95faaaSMadhavan Srinivasan */ 978f95faaaSMadhavan Srinivasan static int imc_get_mem_addr_nest(struct device_node *node, 988f95faaaSMadhavan Srinivasan struct imc_pmu *pmu_ptr, 998f95faaaSMadhavan Srinivasan u32 offset) 1008f95faaaSMadhavan Srinivasan { 1018f95faaaSMadhavan Srinivasan int nr_chips = 0, i; 1028f95faaaSMadhavan Srinivasan u64 *base_addr_arr, baddr; 1038f95faaaSMadhavan Srinivasan u32 *chipid_arr; 1048f95faaaSMadhavan Srinivasan 1058f95faaaSMadhavan Srinivasan nr_chips = of_property_count_u32_elems(node, "chip-id"); 1068f95faaaSMadhavan Srinivasan if (nr_chips <= 0) 1078f95faaaSMadhavan Srinivasan return -ENODEV; 1088f95faaaSMadhavan Srinivasan 109a0828cf5SMarkus Elfring base_addr_arr = kcalloc(nr_chips, sizeof(*base_addr_arr), GFP_KERNEL); 1108f95faaaSMadhavan Srinivasan if (!base_addr_arr) 1118f95faaaSMadhavan Srinivasan return -ENOMEM; 1128f95faaaSMadhavan Srinivasan 113a0828cf5SMarkus Elfring chipid_arr = kcalloc(nr_chips, sizeof(*chipid_arr), GFP_KERNEL); 114cb094fa5SAnju T Sudhakar if (!chipid_arr) { 115cb094fa5SAnju T Sudhakar kfree(base_addr_arr); 1168f95faaaSMadhavan Srinivasan return -ENOMEM; 117cb094fa5SAnju T Sudhakar } 1188f95faaaSMadhavan Srinivasan 1198f95faaaSMadhavan Srinivasan if (of_property_read_u32_array(node, "chip-id", chipid_arr, nr_chips)) 1208f95faaaSMadhavan Srinivasan goto error; 1218f95faaaSMadhavan Srinivasan 1228f95faaaSMadhavan Srinivasan if (of_property_read_u64_array(node, "base-addr", base_addr_arr, 1238f95faaaSMadhavan Srinivasan nr_chips)) 1248f95faaaSMadhavan Srinivasan goto error; 1258f95faaaSMadhavan Srinivasan 126860b7d22SAnju T Sudhakar pmu_ptr->mem_info = kcalloc(nr_chips + 1, sizeof(*pmu_ptr->mem_info), 1278f95faaaSMadhavan Srinivasan GFP_KERNEL); 1288f95faaaSMadhavan Srinivasan if (!pmu_ptr->mem_info) 1298f95faaaSMadhavan Srinivasan goto error; 1308f95faaaSMadhavan Srinivasan 1318f95faaaSMadhavan Srinivasan for (i = 0; i < nr_chips; i++) { 1328f95faaaSMadhavan Srinivasan pmu_ptr->mem_info[i].id = chipid_arr[i]; 1338f95faaaSMadhavan Srinivasan baddr = base_addr_arr[i] + offset; 1348f95faaaSMadhavan Srinivasan pmu_ptr->mem_info[i].vbase = phys_to_virt(baddr); 1358f95faaaSMadhavan Srinivasan } 1368f95faaaSMadhavan Srinivasan 1378f95faaaSMadhavan Srinivasan pmu_ptr->imc_counter_mmaped = true; 138684d9840SAnju T Sudhakar export_imc_mode_and_cmd(node, pmu_ptr); 1398f95faaaSMadhavan Srinivasan kfree(base_addr_arr); 1408f95faaaSMadhavan Srinivasan kfree(chipid_arr); 1418f95faaaSMadhavan Srinivasan return 0; 1428f95faaaSMadhavan Srinivasan 1438f95faaaSMadhavan Srinivasan error: 1448f95faaaSMadhavan Srinivasan kfree(base_addr_arr); 1458f95faaaSMadhavan Srinivasan kfree(chipid_arr); 1468f95faaaSMadhavan Srinivasan return -1; 1478f95faaaSMadhavan Srinivasan } 1488f95faaaSMadhavan Srinivasan 1498f95faaaSMadhavan Srinivasan /* 1508f95faaaSMadhavan Srinivasan * imc_pmu_create : Takes the parent device which is the pmu unit, pmu_index 1518f95faaaSMadhavan Srinivasan * and domain as the inputs. 1528f95faaaSMadhavan Srinivasan * Allocates memory for the struct imc_pmu, sets up its domain, size and offsets 1538f95faaaSMadhavan Srinivasan */ 1548f95faaaSMadhavan Srinivasan static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain) 1558f95faaaSMadhavan Srinivasan { 1568f95faaaSMadhavan Srinivasan int ret = 0; 1578f95faaaSMadhavan Srinivasan struct imc_pmu *pmu_ptr; 1588f95faaaSMadhavan Srinivasan u32 offset; 1598f95faaaSMadhavan Srinivasan 1608f95faaaSMadhavan Srinivasan /* memory for pmu */ 161a0828cf5SMarkus Elfring pmu_ptr = kzalloc(sizeof(*pmu_ptr), GFP_KERNEL); 1628f95faaaSMadhavan Srinivasan if (!pmu_ptr) 1638f95faaaSMadhavan Srinivasan return -ENOMEM; 1648f95faaaSMadhavan Srinivasan 1658f95faaaSMadhavan Srinivasan /* Set the domain */ 1668f95faaaSMadhavan Srinivasan pmu_ptr->domain = domain; 1678f95faaaSMadhavan Srinivasan 1688f95faaaSMadhavan Srinivasan ret = of_property_read_u32(parent, "size", &pmu_ptr->counter_mem_size); 1698f95faaaSMadhavan Srinivasan if (ret) { 1708f95faaaSMadhavan Srinivasan ret = -EINVAL; 1718f95faaaSMadhavan Srinivasan goto free_pmu; 1728f95faaaSMadhavan Srinivasan } 1738f95faaaSMadhavan Srinivasan 1748f95faaaSMadhavan Srinivasan if (!of_property_read_u32(parent, "offset", &offset)) { 1758f95faaaSMadhavan Srinivasan if (imc_get_mem_addr_nest(parent, pmu_ptr, offset)) { 1768f95faaaSMadhavan Srinivasan ret = -EINVAL; 1778f95faaaSMadhavan Srinivasan goto free_pmu; 1788f95faaaSMadhavan Srinivasan } 1798f95faaaSMadhavan Srinivasan } 1808f95faaaSMadhavan Srinivasan 181885dcd70SAnju T Sudhakar /* Function to register IMC pmu */ 182885dcd70SAnju T Sudhakar ret = init_imc_pmu(parent, pmu_ptr, pmu_index); 183cb094fa5SAnju T Sudhakar if (ret) { 184885dcd70SAnju T Sudhakar pr_err("IMC PMU %s Register failed\n", pmu_ptr->pmu.name); 185cb094fa5SAnju T Sudhakar kfree(pmu_ptr->pmu.name); 186cb094fa5SAnju T Sudhakar if (pmu_ptr->domain == IMC_DOMAIN_NEST) 187cb094fa5SAnju T Sudhakar kfree(pmu_ptr->mem_info); 188cb094fa5SAnju T Sudhakar kfree(pmu_ptr); 189cb094fa5SAnju T Sudhakar return ret; 190cb094fa5SAnju T Sudhakar } 191885dcd70SAnju T Sudhakar 1928f95faaaSMadhavan Srinivasan return 0; 1938f95faaaSMadhavan Srinivasan 1948f95faaaSMadhavan Srinivasan free_pmu: 1958f95faaaSMadhavan Srinivasan kfree(pmu_ptr); 1968f95faaaSMadhavan Srinivasan return ret; 1978f95faaaSMadhavan Srinivasan } 1988f95faaaSMadhavan Srinivasan 1998f95faaaSMadhavan Srinivasan static void disable_nest_pmu_counters(void) 2008f95faaaSMadhavan Srinivasan { 2018f95faaaSMadhavan Srinivasan int nid, cpu; 2026538ac30SLABBE Corentin const struct cpumask *l_cpumask; 2038f95faaaSMadhavan Srinivasan 2048f95faaaSMadhavan Srinivasan get_online_cpus(); 205e7bde88cSNicholas Piggin for_each_node_with_cpus(nid) { 2068f95faaaSMadhavan Srinivasan l_cpumask = cpumask_of_node(nid); 207e7bde88cSNicholas Piggin cpu = cpumask_first_and(l_cpumask, cpu_online_mask); 208e7bde88cSNicholas Piggin if (cpu >= nr_cpu_ids) 209e7bde88cSNicholas Piggin continue; 2108f95faaaSMadhavan Srinivasan opal_imc_counters_stop(OPAL_IMC_COUNTERS_NEST, 2118f95faaaSMadhavan Srinivasan get_hard_smp_processor_id(cpu)); 2128f95faaaSMadhavan Srinivasan } 2138f95faaaSMadhavan Srinivasan put_online_cpus(); 2148f95faaaSMadhavan Srinivasan } 2158f95faaaSMadhavan Srinivasan 2168f95faaaSMadhavan Srinivasan static void disable_core_pmu_counters(void) 2178f95faaaSMadhavan Srinivasan { 2188f95faaaSMadhavan Srinivasan cpumask_t cores_map; 2198f95faaaSMadhavan Srinivasan int cpu, rc; 2208f95faaaSMadhavan Srinivasan 2218f95faaaSMadhavan Srinivasan get_online_cpus(); 2228f95faaaSMadhavan Srinivasan /* Disable the IMC Core functions */ 2238f95faaaSMadhavan Srinivasan cores_map = cpu_online_cores_map(); 2248f95faaaSMadhavan Srinivasan for_each_cpu(cpu, &cores_map) { 2258f95faaaSMadhavan Srinivasan rc = opal_imc_counters_stop(OPAL_IMC_COUNTERS_CORE, 2268f95faaaSMadhavan Srinivasan get_hard_smp_processor_id(cpu)); 2278f95faaaSMadhavan Srinivasan if (rc) 2288f95faaaSMadhavan Srinivasan pr_err("%s: Failed to stop Core (cpu = %d)\n", 2298f95faaaSMadhavan Srinivasan __FUNCTION__, cpu); 2308f95faaaSMadhavan Srinivasan } 2318f95faaaSMadhavan Srinivasan put_online_cpus(); 2328f95faaaSMadhavan Srinivasan } 2338f95faaaSMadhavan Srinivasan 23473ce9aecSMadhavan Srinivasan int get_max_nest_dev(void) 23573ce9aecSMadhavan Srinivasan { 23673ce9aecSMadhavan Srinivasan struct device_node *node; 23773ce9aecSMadhavan Srinivasan u32 pmu_units = 0, type; 23873ce9aecSMadhavan Srinivasan 23973ce9aecSMadhavan Srinivasan for_each_compatible_node(node, NULL, IMC_DTB_UNIT_COMPAT) { 24073ce9aecSMadhavan Srinivasan if (of_property_read_u32(node, "type", &type)) 24173ce9aecSMadhavan Srinivasan continue; 24273ce9aecSMadhavan Srinivasan 24373ce9aecSMadhavan Srinivasan if (type == IMC_TYPE_CHIP) 24473ce9aecSMadhavan Srinivasan pmu_units++; 24573ce9aecSMadhavan Srinivasan } 24673ce9aecSMadhavan Srinivasan 24773ce9aecSMadhavan Srinivasan return pmu_units; 24873ce9aecSMadhavan Srinivasan } 24973ce9aecSMadhavan Srinivasan 2508f95faaaSMadhavan Srinivasan static int opal_imc_counters_probe(struct platform_device *pdev) 2518f95faaaSMadhavan Srinivasan { 2528f95faaaSMadhavan Srinivasan struct device_node *imc_dev = pdev->dev.of_node; 2538f95faaaSMadhavan Srinivasan int pmu_count = 0, domain; 25425af86b2SAnju T Sudhakar bool core_imc_reg = false, thread_imc_reg = false; 2558f95faaaSMadhavan Srinivasan u32 type; 2568f95faaaSMadhavan Srinivasan 2578f95faaaSMadhavan Srinivasan /* 2588f95faaaSMadhavan Srinivasan * Check whether this is kdump kernel. If yes, force the engines to 2598f95faaaSMadhavan Srinivasan * stop and return. 2608f95faaaSMadhavan Srinivasan */ 2618f95faaaSMadhavan Srinivasan if (is_kdump_kernel()) { 2628f95faaaSMadhavan Srinivasan disable_nest_pmu_counters(); 2638f95faaaSMadhavan Srinivasan disable_core_pmu_counters(); 2648f95faaaSMadhavan Srinivasan return -ENODEV; 2658f95faaaSMadhavan Srinivasan } 2668f95faaaSMadhavan Srinivasan 2678f95faaaSMadhavan Srinivasan for_each_compatible_node(imc_dev, NULL, IMC_DTB_UNIT_COMPAT) { 2688f95faaaSMadhavan Srinivasan if (of_property_read_u32(imc_dev, "type", &type)) { 2698f95faaaSMadhavan Srinivasan pr_warn("IMC Device without type property\n"); 2708f95faaaSMadhavan Srinivasan continue; 2718f95faaaSMadhavan Srinivasan } 2728f95faaaSMadhavan Srinivasan 2738f95faaaSMadhavan Srinivasan switch (type) { 2748f95faaaSMadhavan Srinivasan case IMC_TYPE_CHIP: 2758f95faaaSMadhavan Srinivasan domain = IMC_DOMAIN_NEST; 2768f95faaaSMadhavan Srinivasan break; 2778f95faaaSMadhavan Srinivasan case IMC_TYPE_CORE: 2788f95faaaSMadhavan Srinivasan domain =IMC_DOMAIN_CORE; 2798f95faaaSMadhavan Srinivasan break; 2808f95faaaSMadhavan Srinivasan case IMC_TYPE_THREAD: 2818f95faaaSMadhavan Srinivasan domain = IMC_DOMAIN_THREAD; 2828f95faaaSMadhavan Srinivasan break; 28372c69dcdSAnju T Sudhakar case IMC_TYPE_TRACE: 28472c69dcdSAnju T Sudhakar domain = IMC_DOMAIN_TRACE; 28572c69dcdSAnju T Sudhakar break; 2868f95faaaSMadhavan Srinivasan default: 2878f95faaaSMadhavan Srinivasan pr_warn("IMC Unknown Device type \n"); 2888f95faaaSMadhavan Srinivasan domain = -1; 2898f95faaaSMadhavan Srinivasan break; 2908f95faaaSMadhavan Srinivasan } 2918f95faaaSMadhavan Srinivasan 292de34787fSMadhavan Srinivasan if (!imc_pmu_create(imc_dev, pmu_count, domain)) { 293de34787fSMadhavan Srinivasan if (domain == IMC_DOMAIN_NEST) 2948f95faaaSMadhavan Srinivasan pmu_count++; 29525af86b2SAnju T Sudhakar if (domain == IMC_DOMAIN_CORE) 29625af86b2SAnju T Sudhakar core_imc_reg = true; 29725af86b2SAnju T Sudhakar if (domain == IMC_DOMAIN_THREAD) 29825af86b2SAnju T Sudhakar thread_imc_reg = true; 2998f95faaaSMadhavan Srinivasan } 300de34787fSMadhavan Srinivasan } 3018f95faaaSMadhavan Srinivasan 302684d9840SAnju T Sudhakar /* If none of the nest units are registered, remove debugfs interface */ 303684d9840SAnju T Sudhakar if (pmu_count == 0) 304684d9840SAnju T Sudhakar debugfs_remove_recursive(imc_debugfs_parent); 305684d9840SAnju T Sudhakar 30625af86b2SAnju T Sudhakar /* If core imc is not registered, unregister thread-imc */ 30725af86b2SAnju T Sudhakar if (!core_imc_reg && thread_imc_reg) 30825af86b2SAnju T Sudhakar unregister_thread_imc(); 30925af86b2SAnju T Sudhakar 3108f95faaaSMadhavan Srinivasan return 0; 3118f95faaaSMadhavan Srinivasan } 3128f95faaaSMadhavan Srinivasan 3138f95faaaSMadhavan Srinivasan static void opal_imc_counters_shutdown(struct platform_device *pdev) 3148f95faaaSMadhavan Srinivasan { 3158f95faaaSMadhavan Srinivasan /* 3168f95faaaSMadhavan Srinivasan * Function only stops the engines which is bare minimum. 3178f95faaaSMadhavan Srinivasan * TODO: Need to handle proper memory cleanup and pmu 3188f95faaaSMadhavan Srinivasan * unregister. 3198f95faaaSMadhavan Srinivasan */ 3208f95faaaSMadhavan Srinivasan disable_nest_pmu_counters(); 3218f95faaaSMadhavan Srinivasan disable_core_pmu_counters(); 3228f95faaaSMadhavan Srinivasan } 3238f95faaaSMadhavan Srinivasan 3248f95faaaSMadhavan Srinivasan static const struct of_device_id opal_imc_match[] = { 3258f95faaaSMadhavan Srinivasan { .compatible = IMC_DTB_COMPAT }, 3268f95faaaSMadhavan Srinivasan {}, 3278f95faaaSMadhavan Srinivasan }; 3288f95faaaSMadhavan Srinivasan 3298f95faaaSMadhavan Srinivasan static struct platform_driver opal_imc_driver = { 3308f95faaaSMadhavan Srinivasan .driver = { 3318f95faaaSMadhavan Srinivasan .name = "opal-imc-counters", 3328f95faaaSMadhavan Srinivasan .of_match_table = opal_imc_match, 3338f95faaaSMadhavan Srinivasan }, 3348f95faaaSMadhavan Srinivasan .probe = opal_imc_counters_probe, 3358f95faaaSMadhavan Srinivasan .shutdown = opal_imc_counters_shutdown, 3368f95faaaSMadhavan Srinivasan }; 3378f95faaaSMadhavan Srinivasan 3388f95faaaSMadhavan Srinivasan builtin_platform_driver(opal_imc_driver); 339