// SPDX-License-Identifier: GPL-2.0-only /* * AMD Cryptographic Coprocessor (CCP) driver * * Copyright (C) 2017 Advanced Micro Devices, Inc. * * Author: Gary R Hook <gary.hook@amd.com> */ #include <linux/debugfs.h> #include <linux/ccp.h> #include "ccp-dev.h" /* DebugFS helpers */ #define OBUFP (obuf + oboff) #define OBUFLEN 512 #define OBUFSPC (OBUFLEN - oboff) #define OSCNPRINTF(fmt, ...) \ scnprintf(OBUFP, OBUFSPC, fmt, ## __VA_ARGS__) #define BUFLEN 63 #define RI_VERSION_NUM 0x0000003F #define RI_AES_PRESENT 0x00000040 #define RI_3DES_PRESENT 0x00000080 #define RI_SHA_PRESENT 0x00000100 #define RI_RSA_PRESENT 0x00000200 #define RI_ECC_PRESENT 0x00000400 #define RI_ZDE_PRESENT 0x00000800 #define RI_ZCE_PRESENT 0x00001000 #define RI_TRNG_PRESENT 0x00002000 #define RI_ELFC_PRESENT 0x00004000 #define RI_ELFC_SHIFT 14 #define RI_NUM_VQM 0x00078000 #define RI_NVQM_SHIFT 15 #define RI_NVQM(r) (((r) * RI_NUM_VQM) >> RI_NVQM_SHIFT) #define RI_LSB_ENTRIES 0x0FF80000 #define RI_NLSB_SHIFT 19 #define RI_NLSB(r) (((r) * RI_LSB_ENTRIES) >> RI_NLSB_SHIFT) static ssize_t ccp5_debugfs_info_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp) { struct ccp_device *ccp = filp->private_data; unsigned int oboff = 0; unsigned int regval; ssize_t ret; char *obuf; if (!ccp) return 0; obuf = kmalloc(OBUFLEN, GFP_KERNEL); if (!obuf) return -ENOMEM; oboff += OSCNPRINTF("Device name: %s\n", ccp->name); oboff += OSCNPRINTF(" RNG name: %s\n", ccp->rngname); oboff += OSCNPRINTF(" # Queues: %d\n", ccp->cmd_q_count); oboff += OSCNPRINTF(" # Cmds: %d\n", ccp->cmd_count); regval = ioread32(ccp->io_regs + CMD5_PSP_CCP_VERSION); oboff += OSCNPRINTF(" Version: %d\n", regval & RI_VERSION_NUM); oboff += OSCNPRINTF(" Engines:"); if (regval & RI_AES_PRESENT) oboff += OSCNPRINTF(" AES"); if (regval & RI_3DES_PRESENT) oboff += OSCNPRINTF(" 3DES"); if (regval & RI_SHA_PRESENT) oboff += OSCNPRINTF(" SHA"); if (regval & RI_RSA_PRESENT) oboff += OSCNPRINTF(" RSA"); if (regval & RI_ECC_PRESENT) oboff += OSCNPRINTF(" ECC"); if (regval & RI_ZDE_PRESENT) oboff += OSCNPRINTF(" ZDE"); if (regval & RI_ZCE_PRESENT) oboff += OSCNPRINTF(" ZCE"); if (regval & RI_TRNG_PRESENT) oboff += OSCNPRINTF(" TRNG"); oboff += OSCNPRINTF("\n"); oboff += OSCNPRINTF(" Queues: %d\n", (regval & RI_NUM_VQM) >> RI_NVQM_SHIFT); oboff += OSCNPRINTF("LSB Entries: %d\n", (regval & RI_LSB_ENTRIES) >> RI_NLSB_SHIFT); ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff); kfree(obuf); return ret; } /* Return a formatted buffer containing the current * statistics across all queues for a CCP. */ static ssize_t ccp5_debugfs_stats_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp) { struct ccp_device *ccp = filp->private_data; unsigned long total_xts_aes_ops = 0; unsigned long total_3des_ops = 0; unsigned long total_aes_ops = 0; unsigned long total_sha_ops = 0; unsigned long total_rsa_ops = 0; unsigned long total_ecc_ops = 0; unsigned long total_pt_ops = 0; unsigned long total_ops = 0; unsigned int oboff = 0; ssize_t ret = 0; unsigned int i; char *obuf; for (i = 0; i < ccp->cmd_q_count; i++) { struct ccp_cmd_queue *cmd_q = &ccp->cmd_q[i]; total_ops += cmd_q->total_ops; total_aes_ops += cmd_q->total_aes_ops; total_xts_aes_ops += cmd_q->total_xts_aes_ops; total_3des_ops += cmd_q->total_3des_ops; total_sha_ops += cmd_q->total_sha_ops; total_rsa_ops += cmd_q->total_rsa_ops; total_pt_ops += cmd_q->total_pt_ops; total_ecc_ops += cmd_q->total_ecc_ops; } obuf = kmalloc(OBUFLEN, GFP_KERNEL); if (!obuf) return -ENOMEM; oboff += OSCNPRINTF("Total Interrupts Handled: %ld\n", ccp->total_interrupts); oboff += OSCNPRINTF(" Total Operations: %ld\n", total_ops); oboff += OSCNPRINTF(" AES: %ld\n", total_aes_ops); oboff += OSCNPRINTF(" XTS AES: %ld\n", total_xts_aes_ops); oboff += OSCNPRINTF(" SHA: %ld\n", total_3des_ops); oboff += OSCNPRINTF(" SHA: %ld\n", total_sha_ops); oboff += OSCNPRINTF(" RSA: %ld\n", total_rsa_ops); oboff += OSCNPRINTF(" Pass-Thru: %ld\n", total_pt_ops); oboff += OSCNPRINTF(" ECC: %ld\n", total_ecc_ops); ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff); kfree(obuf); return ret; } /* Reset the counters in a queue */ static void ccp5_debugfs_reset_queue_stats(struct ccp_cmd_queue *cmd_q) { cmd_q->total_ops = 0L; cmd_q->total_aes_ops = 0L; cmd_q->total_xts_aes_ops = 0L; cmd_q->total_3des_ops = 0L; cmd_q->total_sha_ops = 0L; cmd_q->total_rsa_ops = 0L; cmd_q->total_pt_ops = 0L; cmd_q->total_ecc_ops = 0L; } /* A value was written to the stats variable, which * should be used to reset the queue counters across * that device. */ static ssize_t ccp5_debugfs_stats_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *offp) { struct ccp_device *ccp = filp->private_data; int i; for (i = 0; i < ccp->cmd_q_count; i++) ccp5_debugfs_reset_queue_stats(&ccp->cmd_q[i]); ccp->total_interrupts = 0L; return count; } /* Return a formatted buffer containing the current information * for that queue */ static ssize_t ccp5_debugfs_queue_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp) { struct ccp_cmd_queue *cmd_q = filp->private_data; unsigned int oboff = 0; unsigned int regval; ssize_t ret; char *obuf; if (!cmd_q) return 0; obuf = kmalloc(OBUFLEN, GFP_KERNEL); if (!obuf) return -ENOMEM; oboff += OSCNPRINTF(" Total Queue Operations: %ld\n", cmd_q->total_ops); oboff += OSCNPRINTF(" AES: %ld\n", cmd_q->total_aes_ops); oboff += OSCNPRINTF(" XTS AES: %ld\n", cmd_q->total_xts_aes_ops); oboff += OSCNPRINTF(" SHA: %ld\n", cmd_q->total_3des_ops); oboff += OSCNPRINTF(" SHA: %ld\n", cmd_q->total_sha_ops); oboff += OSCNPRINTF(" RSA: %ld\n", cmd_q->total_rsa_ops); oboff += OSCNPRINTF(" Pass-Thru: %ld\n", cmd_q->total_pt_ops); oboff += OSCNPRINTF(" ECC: %ld\n", cmd_q->total_ecc_ops); regval = ioread32(cmd_q->reg_int_enable); oboff += OSCNPRINTF(" Enabled Interrupts:"); if (regval & INT_EMPTY_QUEUE) oboff += OSCNPRINTF(" EMPTY"); if (regval & INT_QUEUE_STOPPED) oboff += OSCNPRINTF(" STOPPED"); if (regval & INT_ERROR) oboff += OSCNPRINTF(" ERROR"); if (regval & INT_COMPLETION) oboff += OSCNPRINTF(" COMPLETION"); oboff += OSCNPRINTF("\n"); ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff); kfree(obuf); return ret; } /* A value was written to the stats variable for a * queue. Reset the queue counters to this value. */ static ssize_t ccp5_debugfs_queue_write(struct file *filp, const char __user *ubuf, size_t count, loff_t *offp) { struct ccp_cmd_queue *cmd_q = filp->private_data; ccp5_debugfs_reset_queue_stats(cmd_q); return count; } static const struct file_operations ccp_debugfs_info_ops = { .owner = THIS_MODULE, .open = simple_open, .read = ccp5_debugfs_info_read, .write = NULL, }; static const struct file_operations ccp_debugfs_queue_ops = { .owner = THIS_MODULE, .open = simple_open, .read = ccp5_debugfs_queue_read, .write = ccp5_debugfs_queue_write, }; static const struct file_operations ccp_debugfs_stats_ops = { .owner = THIS_MODULE, .open = simple_open, .read = ccp5_debugfs_stats_read, .write = ccp5_debugfs_stats_write, }; static struct dentry *ccp_debugfs_dir; static DEFINE_MUTEX(ccp_debugfs_lock); #define MAX_NAME_LEN 20 void ccp5_debugfs_setup(struct ccp_device *ccp) { struct ccp_cmd_queue *cmd_q; char name[MAX_NAME_LEN + 1]; struct dentry *debugfs_q_instance; int i; if (!debugfs_initialized()) return; mutex_lock(&ccp_debugfs_lock); if (!ccp_debugfs_dir) ccp_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); mutex_unlock(&ccp_debugfs_lock); ccp->debugfs_instance = debugfs_create_dir(ccp->name, ccp_debugfs_dir); debugfs_create_file("info", 0400, ccp->debugfs_instance, ccp, &ccp_debugfs_info_ops); debugfs_create_file("stats", 0600, ccp->debugfs_instance, ccp, &ccp_debugfs_stats_ops); for (i = 0; i < ccp->cmd_q_count; i++) { cmd_q = &ccp->cmd_q[i]; snprintf(name, MAX_NAME_LEN - 1, "q%d", cmd_q->id); debugfs_q_instance = debugfs_create_dir(name, ccp->debugfs_instance); debugfs_create_file("stats", 0600, debugfs_q_instance, cmd_q, &ccp_debugfs_queue_ops); } return; } void ccp5_debugfs_destroy(void) { debugfs_remove_recursive(ccp_debugfs_dir); }