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> 16dbf77fedSAneesh Kumar K.V #include <linux/debugfs.h> 178f95faaaSMadhavan Srinivasan #include <asm/opal.h> 188f95faaaSMadhavan Srinivasan #include <asm/io.h> 198f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 208f95faaaSMadhavan Srinivasan #include <asm/cputhreads.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 38f344f0abSGreg Kroah-Hartman static void imc_debugfs_create_x64(const char *name, umode_t mode, 39684d9840SAnju T Sudhakar struct dentry *parent, u64 *value) 40684d9840SAnju T Sudhakar { 41f344f0abSGreg Kroah-Hartman debugfs_create_file_unsafe(name, mode, parent, value, &fops_imc_x64); 42684d9840SAnju T Sudhakar } 43684d9840SAnju T Sudhakar 44684d9840SAnju T Sudhakar /* 45684d9840SAnju T Sudhakar * export_imc_mode_and_cmd: Create a debugfs interface 46684d9840SAnju T Sudhakar * for imc_cmd and imc_mode 47684d9840SAnju T Sudhakar * for each node in the system. 48684d9840SAnju T Sudhakar * imc_mode and imc_cmd can be changed by echo into 49684d9840SAnju T Sudhakar * this interface. 50684d9840SAnju T Sudhakar */ 51684d9840SAnju T Sudhakar static void export_imc_mode_and_cmd(struct device_node *node, 52684d9840SAnju T Sudhakar struct imc_pmu *pmu_ptr) 53684d9840SAnju T Sudhakar { 54684d9840SAnju T Sudhakar static u64 loc, *imc_mode_addr, *imc_cmd_addr; 55684d9840SAnju T Sudhakar char mode[16], cmd[16]; 56684d9840SAnju T Sudhakar u32 cb_offset; 5741ba17f2SMadhavan Srinivasan struct imc_mem_info *ptr = pmu_ptr->mem_info; 58684d9840SAnju T Sudhakar 59dbf77fedSAneesh Kumar K.V imc_debugfs_parent = debugfs_create_dir("imc", arch_debugfs_dir); 60684d9840SAnju T Sudhakar 61684d9840SAnju T Sudhakar if (of_property_read_u32(node, "cb_offset", &cb_offset)) 62684d9840SAnju T Sudhakar cb_offset = IMC_CNTL_BLK_OFFSET; 63684d9840SAnju T Sudhakar 6441ba17f2SMadhavan Srinivasan while (ptr->vbase != NULL) { 6541ba17f2SMadhavan Srinivasan loc = (u64)(ptr->vbase) + cb_offset; 66684d9840SAnju T Sudhakar imc_mode_addr = (u64 *)(loc + IMC_CNTL_BLK_MODE_OFFSET); 6741ba17f2SMadhavan Srinivasan sprintf(mode, "imc_mode_%d", (u32)(ptr->id)); 68f344f0abSGreg Kroah-Hartman imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent, 69f344f0abSGreg Kroah-Hartman imc_mode_addr); 70684d9840SAnju T Sudhakar 71684d9840SAnju T Sudhakar imc_cmd_addr = (u64 *)(loc + IMC_CNTL_BLK_CMD_OFFSET); 7241ba17f2SMadhavan Srinivasan sprintf(cmd, "imc_cmd_%d", (u32)(ptr->id)); 73f344f0abSGreg Kroah-Hartman imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent, 74f344f0abSGreg Kroah-Hartman imc_cmd_addr); 7541ba17f2SMadhavan Srinivasan ptr++; 76684d9840SAnju T Sudhakar } 77684d9840SAnju T Sudhakar } 788f95faaaSMadhavan Srinivasan 798f95faaaSMadhavan Srinivasan /* 808f95faaaSMadhavan Srinivasan * imc_get_mem_addr_nest: Function to get nest counter memory region 818f95faaaSMadhavan Srinivasan * for each chip 828f95faaaSMadhavan Srinivasan */ 838f95faaaSMadhavan Srinivasan static int imc_get_mem_addr_nest(struct device_node *node, 848f95faaaSMadhavan Srinivasan struct imc_pmu *pmu_ptr, 858f95faaaSMadhavan Srinivasan u32 offset) 868f95faaaSMadhavan Srinivasan { 878f95faaaSMadhavan Srinivasan int nr_chips = 0, i; 888f95faaaSMadhavan Srinivasan u64 *base_addr_arr, baddr; 898f95faaaSMadhavan Srinivasan u32 *chipid_arr; 908f95faaaSMadhavan Srinivasan 918f95faaaSMadhavan Srinivasan nr_chips = of_property_count_u32_elems(node, "chip-id"); 928f95faaaSMadhavan Srinivasan if (nr_chips <= 0) 938f95faaaSMadhavan Srinivasan return -ENODEV; 948f95faaaSMadhavan Srinivasan 95a0828cf5SMarkus Elfring base_addr_arr = kcalloc(nr_chips, sizeof(*base_addr_arr), GFP_KERNEL); 968f95faaaSMadhavan Srinivasan if (!base_addr_arr) 978f95faaaSMadhavan Srinivasan return -ENOMEM; 988f95faaaSMadhavan Srinivasan 99a0828cf5SMarkus Elfring chipid_arr = kcalloc(nr_chips, sizeof(*chipid_arr), GFP_KERNEL); 100cb094fa5SAnju T Sudhakar if (!chipid_arr) { 101cb094fa5SAnju T Sudhakar kfree(base_addr_arr); 1028f95faaaSMadhavan Srinivasan return -ENOMEM; 103cb094fa5SAnju T Sudhakar } 1048f95faaaSMadhavan Srinivasan 1058f95faaaSMadhavan Srinivasan if (of_property_read_u32_array(node, "chip-id", chipid_arr, nr_chips)) 1068f95faaaSMadhavan Srinivasan goto error; 1078f95faaaSMadhavan Srinivasan 1088f95faaaSMadhavan Srinivasan if (of_property_read_u64_array(node, "base-addr", base_addr_arr, 1098f95faaaSMadhavan Srinivasan nr_chips)) 1108f95faaaSMadhavan Srinivasan goto error; 1118f95faaaSMadhavan Srinivasan 112860b7d22SAnju T Sudhakar pmu_ptr->mem_info = kcalloc(nr_chips + 1, sizeof(*pmu_ptr->mem_info), 1138f95faaaSMadhavan Srinivasan GFP_KERNEL); 1148f95faaaSMadhavan Srinivasan if (!pmu_ptr->mem_info) 1158f95faaaSMadhavan Srinivasan goto error; 1168f95faaaSMadhavan Srinivasan 1178f95faaaSMadhavan Srinivasan for (i = 0; i < nr_chips; i++) { 1188f95faaaSMadhavan Srinivasan pmu_ptr->mem_info[i].id = chipid_arr[i]; 1198f95faaaSMadhavan Srinivasan baddr = base_addr_arr[i] + offset; 1208f95faaaSMadhavan Srinivasan pmu_ptr->mem_info[i].vbase = phys_to_virt(baddr); 1218f95faaaSMadhavan Srinivasan } 1228f95faaaSMadhavan Srinivasan 1238f95faaaSMadhavan Srinivasan pmu_ptr->imc_counter_mmaped = true; 1248f95faaaSMadhavan Srinivasan kfree(base_addr_arr); 1258f95faaaSMadhavan Srinivasan kfree(chipid_arr); 1268f95faaaSMadhavan Srinivasan return 0; 1278f95faaaSMadhavan Srinivasan 1288f95faaaSMadhavan Srinivasan error: 1298f95faaaSMadhavan Srinivasan kfree(base_addr_arr); 1308f95faaaSMadhavan Srinivasan kfree(chipid_arr); 1318f95faaaSMadhavan Srinivasan return -1; 1328f95faaaSMadhavan Srinivasan } 1338f95faaaSMadhavan Srinivasan 1348f95faaaSMadhavan Srinivasan /* 1358f95faaaSMadhavan Srinivasan * imc_pmu_create : Takes the parent device which is the pmu unit, pmu_index 1368f95faaaSMadhavan Srinivasan * and domain as the inputs. 1378f95faaaSMadhavan Srinivasan * Allocates memory for the struct imc_pmu, sets up its domain, size and offsets 1388f95faaaSMadhavan Srinivasan */ 13948e626acSAnju T Sudhakar static struct imc_pmu *imc_pmu_create(struct device_node *parent, int pmu_index, int domain) 1408f95faaaSMadhavan Srinivasan { 1418f95faaaSMadhavan Srinivasan int ret = 0; 1428f95faaaSMadhavan Srinivasan struct imc_pmu *pmu_ptr; 1438f95faaaSMadhavan Srinivasan u32 offset; 1448f95faaaSMadhavan Srinivasan 145b59bd352SAnju T Sudhakar /* Return for unknown domain */ 146b59bd352SAnju T Sudhakar if (domain < 0) 14748e626acSAnju T Sudhakar return NULL; 148b59bd352SAnju T Sudhakar 1498f95faaaSMadhavan Srinivasan /* memory for pmu */ 150a0828cf5SMarkus Elfring pmu_ptr = kzalloc(sizeof(*pmu_ptr), GFP_KERNEL); 1518f95faaaSMadhavan Srinivasan if (!pmu_ptr) 15248e626acSAnju T Sudhakar return NULL; 1538f95faaaSMadhavan Srinivasan 1548f95faaaSMadhavan Srinivasan /* Set the domain */ 1558f95faaaSMadhavan Srinivasan pmu_ptr->domain = domain; 1568f95faaaSMadhavan Srinivasan 1578f95faaaSMadhavan Srinivasan ret = of_property_read_u32(parent, "size", &pmu_ptr->counter_mem_size); 15848e626acSAnju T Sudhakar if (ret) 1598f95faaaSMadhavan Srinivasan goto free_pmu; 1608f95faaaSMadhavan Srinivasan 1618f95faaaSMadhavan Srinivasan if (!of_property_read_u32(parent, "offset", &offset)) { 16248e626acSAnju T Sudhakar if (imc_get_mem_addr_nest(parent, pmu_ptr, offset)) 1638f95faaaSMadhavan Srinivasan goto free_pmu; 1648f95faaaSMadhavan Srinivasan } 1658f95faaaSMadhavan Srinivasan 166885dcd70SAnju T Sudhakar /* Function to register IMC pmu */ 167885dcd70SAnju T Sudhakar ret = init_imc_pmu(parent, pmu_ptr, pmu_index); 168cb094fa5SAnju T Sudhakar if (ret) { 169885dcd70SAnju T Sudhakar pr_err("IMC PMU %s Register failed\n", pmu_ptr->pmu.name); 170cb094fa5SAnju T Sudhakar kfree(pmu_ptr->pmu.name); 171cb094fa5SAnju T Sudhakar if (pmu_ptr->domain == IMC_DOMAIN_NEST) 172cb094fa5SAnju T Sudhakar kfree(pmu_ptr->mem_info); 173cb094fa5SAnju T Sudhakar kfree(pmu_ptr); 17448e626acSAnju T Sudhakar return NULL; 175cb094fa5SAnju T Sudhakar } 176885dcd70SAnju T Sudhakar 17748e626acSAnju T Sudhakar return pmu_ptr; 1788f95faaaSMadhavan Srinivasan 1798f95faaaSMadhavan Srinivasan free_pmu: 1808f95faaaSMadhavan Srinivasan kfree(pmu_ptr); 18148e626acSAnju T Sudhakar return NULL; 1828f95faaaSMadhavan Srinivasan } 1838f95faaaSMadhavan Srinivasan 1848f95faaaSMadhavan Srinivasan static void disable_nest_pmu_counters(void) 1858f95faaaSMadhavan Srinivasan { 1868f95faaaSMadhavan Srinivasan int nid, cpu; 1876538ac30SLABBE Corentin const struct cpumask *l_cpumask; 1888f95faaaSMadhavan Srinivasan 1895ae36401SSebastian Andrzej Siewior cpus_read_lock(); 190e7bde88cSNicholas Piggin for_each_node_with_cpus(nid) { 1918f95faaaSMadhavan Srinivasan l_cpumask = cpumask_of_node(nid); 192e7bde88cSNicholas Piggin cpu = cpumask_first_and(l_cpumask, cpu_online_mask); 193e7bde88cSNicholas Piggin if (cpu >= nr_cpu_ids) 194e7bde88cSNicholas Piggin continue; 1958f95faaaSMadhavan Srinivasan opal_imc_counters_stop(OPAL_IMC_COUNTERS_NEST, 1968f95faaaSMadhavan Srinivasan get_hard_smp_processor_id(cpu)); 1978f95faaaSMadhavan Srinivasan } 1985ae36401SSebastian Andrzej Siewior cpus_read_unlock(); 1998f95faaaSMadhavan Srinivasan } 2008f95faaaSMadhavan Srinivasan 2018f95faaaSMadhavan Srinivasan static void disable_core_pmu_counters(void) 2028f95faaaSMadhavan Srinivasan { 2038f95faaaSMadhavan Srinivasan int cpu, rc; 2048f95faaaSMadhavan Srinivasan 2055ae36401SSebastian Andrzej Siewior cpus_read_lock(); 2068f95faaaSMadhavan Srinivasan /* Disable the IMC Core functions */ 207b350111bSNicholas Piggin for_each_online_cpu(cpu) { 208b350111bSNicholas Piggin if (cpu_first_thread_sibling(cpu) != cpu) 209b350111bSNicholas Piggin continue; 2108f95faaaSMadhavan Srinivasan rc = opal_imc_counters_stop(OPAL_IMC_COUNTERS_CORE, 2118f95faaaSMadhavan Srinivasan get_hard_smp_processor_id(cpu)); 2128f95faaaSMadhavan Srinivasan if (rc) 2138f95faaaSMadhavan Srinivasan pr_err("%s: Failed to stop Core (cpu = %d)\n", 214*4ac751d3SDwaipayan Ray __func__, cpu); 2158f95faaaSMadhavan Srinivasan } 2165ae36401SSebastian Andrzej Siewior cpus_read_unlock(); 2178f95faaaSMadhavan Srinivasan } 2188f95faaaSMadhavan Srinivasan 21973ce9aecSMadhavan Srinivasan int get_max_nest_dev(void) 22073ce9aecSMadhavan Srinivasan { 22173ce9aecSMadhavan Srinivasan struct device_node *node; 22273ce9aecSMadhavan Srinivasan u32 pmu_units = 0, type; 22373ce9aecSMadhavan Srinivasan 22473ce9aecSMadhavan Srinivasan for_each_compatible_node(node, NULL, IMC_DTB_UNIT_COMPAT) { 22573ce9aecSMadhavan Srinivasan if (of_property_read_u32(node, "type", &type)) 22673ce9aecSMadhavan Srinivasan continue; 22773ce9aecSMadhavan Srinivasan 22873ce9aecSMadhavan Srinivasan if (type == IMC_TYPE_CHIP) 22973ce9aecSMadhavan Srinivasan pmu_units++; 23073ce9aecSMadhavan Srinivasan } 23173ce9aecSMadhavan Srinivasan 23273ce9aecSMadhavan Srinivasan return pmu_units; 23373ce9aecSMadhavan Srinivasan } 23473ce9aecSMadhavan Srinivasan 2358f95faaaSMadhavan Srinivasan static int opal_imc_counters_probe(struct platform_device *pdev) 2368f95faaaSMadhavan Srinivasan { 2378f95faaaSMadhavan Srinivasan struct device_node *imc_dev = pdev->dev.of_node; 23848e626acSAnju T Sudhakar struct imc_pmu *pmu; 2398f95faaaSMadhavan Srinivasan int pmu_count = 0, domain; 24025af86b2SAnju T Sudhakar bool core_imc_reg = false, thread_imc_reg = false; 2418f95faaaSMadhavan Srinivasan u32 type; 2428f95faaaSMadhavan Srinivasan 2438f95faaaSMadhavan Srinivasan /* 2448f95faaaSMadhavan Srinivasan * Check whether this is kdump kernel. If yes, force the engines to 2458f95faaaSMadhavan Srinivasan * stop and return. 2468f95faaaSMadhavan Srinivasan */ 2478f95faaaSMadhavan Srinivasan if (is_kdump_kernel()) { 2488f95faaaSMadhavan Srinivasan disable_nest_pmu_counters(); 2498f95faaaSMadhavan Srinivasan disable_core_pmu_counters(); 2508f95faaaSMadhavan Srinivasan return -ENODEV; 2518f95faaaSMadhavan Srinivasan } 2528f95faaaSMadhavan Srinivasan 2538f95faaaSMadhavan Srinivasan for_each_compatible_node(imc_dev, NULL, IMC_DTB_UNIT_COMPAT) { 25448e626acSAnju T Sudhakar pmu = NULL; 2558f95faaaSMadhavan Srinivasan if (of_property_read_u32(imc_dev, "type", &type)) { 2568f95faaaSMadhavan Srinivasan pr_warn("IMC Device without type property\n"); 2578f95faaaSMadhavan Srinivasan continue; 2588f95faaaSMadhavan Srinivasan } 2598f95faaaSMadhavan Srinivasan 2608f95faaaSMadhavan Srinivasan switch (type) { 2618f95faaaSMadhavan Srinivasan case IMC_TYPE_CHIP: 2628f95faaaSMadhavan Srinivasan domain = IMC_DOMAIN_NEST; 2638f95faaaSMadhavan Srinivasan break; 2648f95faaaSMadhavan Srinivasan case IMC_TYPE_CORE: 2658f95faaaSMadhavan Srinivasan domain =IMC_DOMAIN_CORE; 2668f95faaaSMadhavan Srinivasan break; 2678f95faaaSMadhavan Srinivasan case IMC_TYPE_THREAD: 2688f95faaaSMadhavan Srinivasan domain = IMC_DOMAIN_THREAD; 2698f95faaaSMadhavan Srinivasan break; 27072c69dcdSAnju T Sudhakar case IMC_TYPE_TRACE: 2714bdd3946SAnju T Sudhakar domain = IMC_DOMAIN_TRACE; 27272c69dcdSAnju T Sudhakar break; 2738f95faaaSMadhavan Srinivasan default: 2748f95faaaSMadhavan Srinivasan pr_warn("IMC Unknown Device type \n"); 2758f95faaaSMadhavan Srinivasan domain = -1; 2768f95faaaSMadhavan Srinivasan break; 2778f95faaaSMadhavan Srinivasan } 2788f95faaaSMadhavan Srinivasan 27948e626acSAnju T Sudhakar pmu = imc_pmu_create(imc_dev, pmu_count, domain); 28048e626acSAnju T Sudhakar if (pmu != NULL) { 28148e626acSAnju T Sudhakar if (domain == IMC_DOMAIN_NEST) { 28248e626acSAnju T Sudhakar if (!imc_debugfs_parent) 28348e626acSAnju T Sudhakar export_imc_mode_and_cmd(imc_dev, pmu); 2848f95faaaSMadhavan Srinivasan pmu_count++; 28548e626acSAnju T Sudhakar } 28625af86b2SAnju T Sudhakar if (domain == IMC_DOMAIN_CORE) 28725af86b2SAnju T Sudhakar core_imc_reg = true; 28825af86b2SAnju T Sudhakar if (domain == IMC_DOMAIN_THREAD) 28925af86b2SAnju T Sudhakar thread_imc_reg = true; 2908f95faaaSMadhavan Srinivasan } 291de34787fSMadhavan Srinivasan } 2928f95faaaSMadhavan Srinivasan 29325af86b2SAnju T Sudhakar /* If core imc is not registered, unregister thread-imc */ 29425af86b2SAnju T Sudhakar if (!core_imc_reg && thread_imc_reg) 29525af86b2SAnju T Sudhakar unregister_thread_imc(); 29625af86b2SAnju T Sudhakar 2978f95faaaSMadhavan Srinivasan return 0; 2988f95faaaSMadhavan Srinivasan } 2998f95faaaSMadhavan Srinivasan 3008f95faaaSMadhavan Srinivasan static void opal_imc_counters_shutdown(struct platform_device *pdev) 3018f95faaaSMadhavan Srinivasan { 3028f95faaaSMadhavan Srinivasan /* 3038f95faaaSMadhavan Srinivasan * Function only stops the engines which is bare minimum. 3048f95faaaSMadhavan Srinivasan * TODO: Need to handle proper memory cleanup and pmu 3058f95faaaSMadhavan Srinivasan * unregister. 3068f95faaaSMadhavan Srinivasan */ 3078f95faaaSMadhavan Srinivasan disable_nest_pmu_counters(); 3088f95faaaSMadhavan Srinivasan disable_core_pmu_counters(); 3098f95faaaSMadhavan Srinivasan } 3108f95faaaSMadhavan Srinivasan 3118f95faaaSMadhavan Srinivasan static const struct of_device_id opal_imc_match[] = { 3128f95faaaSMadhavan Srinivasan { .compatible = IMC_DTB_COMPAT }, 3138f95faaaSMadhavan Srinivasan {}, 3148f95faaaSMadhavan Srinivasan }; 3158f95faaaSMadhavan Srinivasan 3168f95faaaSMadhavan Srinivasan static struct platform_driver opal_imc_driver = { 3178f95faaaSMadhavan Srinivasan .driver = { 3188f95faaaSMadhavan Srinivasan .name = "opal-imc-counters", 3198f95faaaSMadhavan Srinivasan .of_match_table = opal_imc_match, 3208f95faaaSMadhavan Srinivasan }, 3218f95faaaSMadhavan Srinivasan .probe = opal_imc_counters_probe, 3228f95faaaSMadhavan Srinivasan .shutdown = opal_imc_counters_shutdown, 3238f95faaaSMadhavan Srinivasan }; 3248f95faaaSMadhavan Srinivasan 3258f95faaaSMadhavan Srinivasan builtin_platform_driver(opal_imc_driver); 326