// SPDX-License-Identifier: GPL-2.0-only /* * Intel MIC Platform Software Stack (MPSS) * * Copyright(c) 2015 Intel Corporation. * * Intel MIC Coprocessor State Management (COSM) Driver */ #include <linux/debugfs.h> #include <linux/slab.h> #include <linux/io.h> #include "cosm_main.h" /* Debugfs parent dir */ static struct dentry *cosm_dbg; /** * log_buf_show - Display MIC kernel log buffer * * log_buf addr/len is read from System.map by user space * and populated in sysfs entries. */ static int log_buf_show(struct seq_file *s, void *unused) { void __iomem *log_buf_va; int __iomem *log_buf_len_va; struct cosm_device *cdev = s->private; void *kva; int size; u64 aper_offset; if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len) goto done; mutex_lock(&cdev->cosm_mutex); switch (cdev->state) { case MIC_BOOTING: case MIC_ONLINE: case MIC_SHUTTING_DOWN: break; default: goto unlock; } /* * Card kernel will never be relocated and any kernel text/data mapping * can be translated to phys address by subtracting __START_KERNEL_map. */ aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map; log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset; aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map; log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset; size = ioread32(log_buf_len_va); kva = kmalloc(size, GFP_KERNEL); if (!kva) goto unlock; memcpy_fromio(kva, log_buf_va, size); seq_write(s, kva, size); kfree(kva); unlock: mutex_unlock(&cdev->cosm_mutex); done: return 0; } DEFINE_SHOW_ATTRIBUTE(log_buf); /** * force_reset_show - Force MIC reset * * Invokes the force_reset COSM bus op instead of the standard reset * op in case a force reset of the MIC device is required */ static int force_reset_show(struct seq_file *s, void *pos) { struct cosm_device *cdev = s->private; cosm_stop(cdev, true); return 0; } DEFINE_SHOW_ATTRIBUTE(force_reset); void cosm_create_debug_dir(struct cosm_device *cdev) { char name[16]; if (!cosm_dbg) return; scnprintf(name, sizeof(name), "mic%d", cdev->index); cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg); debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev, &log_buf_fops); debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev, &force_reset_fops); } void cosm_delete_debug_dir(struct cosm_device *cdev) { debugfs_remove_recursive(cdev->dbg_dir); } void cosm_init_debugfs(void) { cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL); } void cosm_exit_debugfs(void) { debugfs_remove(cosm_dbg); }