1192 lines
29 KiB
C
1192 lines
29 KiB
C
/* Copyright (c) 2010-2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/compiler.h>
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#include <soc/qcom/scm.h>
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#define SCM_ENOMEM -5
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#define SCM_EOPNOTSUPP -4
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#define SCM_EINVAL_ADDR -3
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#define SCM_EINVAL_ARG -2
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#define SCM_ERROR -1
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#define SCM_INTERRUPTED 1
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#define SCM_EBUSY -55
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#define SCM_V2_EBUSY -12
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static DEFINE_MUTEX(scm_lock);
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/*
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* MSM8996 V2 requires a lock to protect against
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* concurrent accesses between the limits management
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* driver and the clock controller
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*/
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DEFINE_MUTEX(scm_lmh_lock);
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#define SCM_EBUSY_WAIT_MS 30
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#define SCM_EBUSY_MAX_RETRY 20
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#define N_EXT_SCM_ARGS 7
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#define FIRST_EXT_ARG_IDX 3
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#define SMC_ATOMIC_SYSCALL 31
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#define N_REGISTER_ARGS (MAX_SCM_ARGS - N_EXT_SCM_ARGS + 1)
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#define SMC64_MASK 0x40000000
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#define SMC_ATOMIC_MASK 0x80000000
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#define IS_CALL_AVAIL_CMD 1
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#define SCM_BUF_LEN(__cmd_size, __resp_size) \
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(sizeof(struct scm_command) + sizeof(struct scm_response) + \
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__cmd_size + __resp_size)
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/**
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* struct scm_command - one SCM command buffer
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* @len: total available memory for command and response
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* @buf_offset: start of command buffer
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* @resp_hdr_offset: start of response buffer
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* @id: command to be executed
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* @buf: buffer returned from scm_get_command_buffer()
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*
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* An SCM command is laid out in memory as follows:
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*
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* ------------------- <--- struct scm_command
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* | command header |
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* ------------------- <--- scm_get_command_buffer()
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* | command buffer |
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* ------------------- <--- struct scm_response and
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* | response header | scm_command_to_response()
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* ------------------- <--- scm_get_response_buffer()
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* | response buffer |
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* -------------------
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*
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* There can be arbitrary padding between the headers and buffers so
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* you should always use the appropriate scm_get_*_buffer() routines
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* to access the buffers in a safe manner.
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*/
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struct scm_command {
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u32 len;
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u32 buf_offset;
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u32 resp_hdr_offset;
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u32 id;
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u32 buf[0];
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};
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/**
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* struct scm_response - one SCM response buffer
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* @len: total available memory for response
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* @buf_offset: start of response data relative to start of scm_response
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* @is_complete: indicates if the command has finished processing
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*/
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struct scm_response {
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u32 len;
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u32 buf_offset;
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u32 is_complete;
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};
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#ifdef CONFIG_ARM64
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#define R0_STR "x0"
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#define R1_STR "x1"
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#define R2_STR "x2"
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#define R3_STR "x3"
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#define R4_STR "x4"
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#define R5_STR "x5"
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#define R6_STR "x6"
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/* Outer caches unsupported on ARM64 platforms */
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#define outer_inv_range(x, y)
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#define outer_flush_range(x, y)
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#define __cpuc_flush_dcache_area __flush_dcache_area
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#else
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#define R0_STR "r0"
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#define R1_STR "r1"
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#define R2_STR "r2"
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#define R3_STR "r3"
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#define R4_STR "r4"
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#define R5_STR "r5"
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#define R6_STR "r6"
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#endif
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/**
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* scm_command_to_response() - Get a pointer to a scm_response
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* @cmd: command
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*
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* Returns a pointer to a response for a command.
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*/
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static inline struct scm_response *scm_command_to_response(
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const struct scm_command *cmd)
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{
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return (void *)cmd + cmd->resp_hdr_offset;
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}
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/**
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* scm_get_command_buffer() - Get a pointer to a command buffer
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* @cmd: command
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*
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* Returns a pointer to the command buffer of a command.
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*/
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static inline void *scm_get_command_buffer(const struct scm_command *cmd)
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{
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return (void *)cmd->buf;
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}
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/**
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* scm_get_response_buffer() - Get a pointer to a response buffer
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* @rsp: response
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*
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* Returns a pointer to a response buffer of a response.
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*/
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static inline void *scm_get_response_buffer(const struct scm_response *rsp)
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{
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return (void *)rsp + rsp->buf_offset;
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}
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static int scm_remap_error(int err)
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{
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switch (err) {
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case SCM_ERROR:
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return -EIO;
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case SCM_EINVAL_ADDR:
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case SCM_EINVAL_ARG:
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return -EINVAL;
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case SCM_EOPNOTSUPP:
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return -EOPNOTSUPP;
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case SCM_ENOMEM:
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return -ENOMEM;
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case SCM_EBUSY:
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return SCM_EBUSY;
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case SCM_V2_EBUSY:
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return SCM_V2_EBUSY;
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}
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return -EINVAL;
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}
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static u32 smc(u32 cmd_addr)
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{
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int context_id;
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register u32 r0 asm("r0") = 1;
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register u32 r1 asm("r1") = (uintptr_t)&context_id;
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register u32 r2 asm("r2") = cmd_addr;
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do {
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asm volatile(
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__asmeq("%0", R0_STR)
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__asmeq("%1", R0_STR)
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__asmeq("%2", R1_STR)
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__asmeq("%3", R2_STR)
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0\n"
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: "=r" (r0)
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: "r" (r0), "r" (r1), "r" (r2)
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: "r3");
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} while (r0 == SCM_INTERRUPTED);
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return r0;
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}
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static int __scm_call(const struct scm_command *cmd)
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{
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int ret;
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u32 cmd_addr = virt_to_phys(cmd);
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/*
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* Flush the command buffer so that the secure world sees
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* the correct data.
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*/
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__cpuc_flush_dcache_area((void *)cmd, cmd->len);
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outer_flush_range(cmd_addr, cmd_addr + cmd->len);
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ret = smc(cmd_addr);
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if (ret < 0) {
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if (ret != SCM_EBUSY)
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pr_err("scm_call failed with error code %d\n", ret);
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ret = scm_remap_error(ret);
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}
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return ret;
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}
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#ifndef CONFIG_ARM64
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static void scm_inv_range(unsigned long start, unsigned long end)
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{
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u32 cacheline_size, ctr;
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asm volatile("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
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cacheline_size = 4 << ((ctr >> 16) & 0xf);
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start = round_down(start, cacheline_size);
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end = round_up(end, cacheline_size);
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outer_inv_range(start, end);
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while (start < end) {
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asm ("mcr p15, 0, %0, c7, c6, 1" : : "r" (start)
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: "memory");
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start += cacheline_size;
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}
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dsb();
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isb();
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}
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#else
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static void scm_inv_range(unsigned long start, unsigned long end)
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{
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dmac_inv_range((void *)start, (void *)end);
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}
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#endif
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/**
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* scm_call_common() - Send an SCM command
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* @svc_id: service identifier
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* @cmd_id: command identifier
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* @cmd_buf: command buffer
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* @cmd_len: length of the command buffer
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* @resp_buf: response buffer
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* @resp_len: length of the response buffer
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* @scm_buf: internal scm structure used for passing data
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* @scm_buf_len: length of the internal scm structure
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*
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* Core function to scm call. Initializes the given cmd structure with
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* appropriate values and makes the actual scm call. Validation of cmd
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* pointer and length must occur in the calling function.
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*
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* Returns the appropriate error code from the scm call
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*/
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static int scm_call_common(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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size_t cmd_len, void *resp_buf, size_t resp_len,
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struct scm_command *scm_buf,
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size_t scm_buf_length)
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{
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int ret;
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struct scm_response *rsp;
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unsigned long start, end;
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scm_buf->len = scm_buf_length;
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scm_buf->buf_offset = offsetof(struct scm_command, buf);
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scm_buf->resp_hdr_offset = scm_buf->buf_offset + cmd_len;
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scm_buf->id = (svc_id << 10) | cmd_id;
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if (cmd_buf)
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memcpy(scm_get_command_buffer(scm_buf), cmd_buf, cmd_len);
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mutex_lock(&scm_lock);
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ret = __scm_call(scm_buf);
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mutex_unlock(&scm_lock);
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if (ret)
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return ret;
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rsp = scm_command_to_response(scm_buf);
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start = (unsigned long)rsp;
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do {
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scm_inv_range(start, start + sizeof(*rsp));
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} while (!rsp->is_complete);
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end = (unsigned long)scm_get_response_buffer(rsp) + resp_len;
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scm_inv_range(start, end);
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if (resp_buf)
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memcpy(resp_buf, scm_get_response_buffer(rsp), resp_len);
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return ret;
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}
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/*
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* Sometimes the secure world may be busy waiting for a particular resource.
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* In those situations, it is expected that the secure world returns a special
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* error code (SCM_EBUSY). Retry any scm_call that fails with this error code,
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* but with a timeout in place. Also, don't move this into scm_call_common,
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* since we want the first attempt to be the "fastpath".
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*/
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static int _scm_call_retry(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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size_t cmd_len, void *resp_buf, size_t resp_len,
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struct scm_command *cmd,
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size_t len)
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{
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int ret, retry_count = 0;
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do {
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ret = scm_call_common(svc_id, cmd_id, cmd_buf, cmd_len,
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resp_buf, resp_len, cmd, len);
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if (ret == SCM_EBUSY)
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msleep(SCM_EBUSY_WAIT_MS);
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} while (ret == SCM_EBUSY && (retry_count++ < SCM_EBUSY_MAX_RETRY));
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if (ret == SCM_EBUSY)
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pr_err("scm: secure world busy (rc = SCM_EBUSY)\n");
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return ret;
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}
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/**
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* scm_call_noalloc - Send an SCM command
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*
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* Same as scm_call except clients pass in a buffer (@scm_buf) to be used for
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* scm internal structures. The buffer should be allocated with
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* DEFINE_SCM_BUFFER to account for the proper alignment and size.
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*/
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int scm_call_noalloc(u32 svc_id, u32 cmd_id, const void *cmd_buf,
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size_t cmd_len, void *resp_buf, size_t resp_len,
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void *scm_buf, size_t scm_buf_len)
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{
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int ret;
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size_t len = SCM_BUF_LEN(cmd_len, resp_len);
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if (cmd_len > scm_buf_len || resp_len > scm_buf_len ||
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len > scm_buf_len)
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return -EINVAL;
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if (!IS_ALIGNED((unsigned long)scm_buf, PAGE_SIZE))
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return -EINVAL;
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memset(scm_buf, 0, scm_buf_len);
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ret = scm_call_common(svc_id, cmd_id, cmd_buf, cmd_len, resp_buf,
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resp_len, scm_buf, len);
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return ret;
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}
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#ifdef CONFIG_ARM64
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static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
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u64 *ret1, u64 *ret2, u64 *ret3)
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{
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register u64 r0 asm("r0") = x0;
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register u64 r1 asm("r1") = x1;
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register u64 r2 asm("r2") = x2;
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register u64 r3 asm("r3") = x3;
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register u64 r4 asm("r4") = x4;
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register u64 r5 asm("r5") = x5;
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register u64 r6 asm("r6") = 0;
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do {
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asm volatile(
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__asmeq("%0", R0_STR)
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__asmeq("%1", R1_STR)
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__asmeq("%2", R2_STR)
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__asmeq("%3", R3_STR)
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__asmeq("%4", R0_STR)
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__asmeq("%5", R1_STR)
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__asmeq("%6", R2_STR)
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__asmeq("%7", R3_STR)
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__asmeq("%8", R4_STR)
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__asmeq("%9", R5_STR)
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__asmeq("%10", R6_STR)
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0\n"
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: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
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: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
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"r" (r5), "r" (r6)
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: "x7", "x8", "x9", "x10", "x11", "x12", "x13",
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"x14", "x15", "x16", "x17");
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} while (r0 == SCM_INTERRUPTED);
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if (ret1)
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*ret1 = r1;
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if (ret2)
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*ret2 = r2;
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if (ret3)
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*ret3 = r3;
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return r0;
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}
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static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5,
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u64 *ret1, u64 *ret2, u64 *ret3)
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{
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register u32 r0 asm("r0") = w0;
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register u32 r1 asm("r1") = w1;
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register u32 r2 asm("r2") = w2;
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register u32 r3 asm("r3") = w3;
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register u32 r4 asm("r4") = w4;
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register u32 r5 asm("r5") = w5;
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register u32 r6 asm("r6") = 0;
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do {
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asm volatile(
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__asmeq("%0", R0_STR)
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__asmeq("%1", R1_STR)
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__asmeq("%2", R2_STR)
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__asmeq("%3", R3_STR)
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__asmeq("%4", R0_STR)
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__asmeq("%5", R1_STR)
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__asmeq("%6", R2_STR)
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__asmeq("%7", R3_STR)
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__asmeq("%8", R4_STR)
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__asmeq("%9", R5_STR)
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__asmeq("%10", R6_STR)
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#ifdef REQUIRES_SEC
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".arch_extension sec\n"
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#endif
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"smc #0\n"
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: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
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: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
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"r" (r5), "r" (r6)
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: "x7", "x8", "x9", "x10", "x11", "x12", "x13",
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"x14", "x15", "x16", "x17");
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} while (r0 == SCM_INTERRUPTED);
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if (ret1)
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*ret1 = r1;
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if (ret2)
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*ret2 = r2;
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if (ret3)
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*ret3 = r3;
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return r0;
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}
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#else
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static int __scm_call_armv8_32(u32 w0, u32 w1, u32 w2, u32 w3, u32 w4, u32 w5,
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u64 *ret1, u64 *ret2, u64 *ret3)
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{
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register u32 r0 asm("r0") = w0;
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register u32 r1 asm("r1") = w1;
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register u32 r2 asm("r2") = w2;
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register u32 r3 asm("r3") = w3;
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register u32 r4 asm("r4") = w4;
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register u32 r5 asm("r5") = w5;
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register u32 r6 asm("r6") = 0;
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do {
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asm volatile(
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__asmeq("%0", R0_STR)
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__asmeq("%1", R1_STR)
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__asmeq("%2", R2_STR)
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__asmeq("%3", R3_STR)
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__asmeq("%4", R0_STR)
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__asmeq("%5", R1_STR)
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__asmeq("%6", R2_STR)
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__asmeq("%7", R3_STR)
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__asmeq("%8", R4_STR)
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__asmeq("%9", R5_STR)
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__asmeq("%10", R6_STR)
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#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
|
|
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4),
|
|
"r" (r5), "r" (r6));
|
|
|
|
} while (r0 == SCM_INTERRUPTED);
|
|
|
|
if (ret1)
|
|
*ret1 = r1;
|
|
if (ret2)
|
|
*ret2 = r2;
|
|
if (ret3)
|
|
*ret3 = r3;
|
|
|
|
return r0;
|
|
}
|
|
|
|
static int __scm_call_armv8_64(u64 x0, u64 x1, u64 x2, u64 x3, u64 x4, u64 x5,
|
|
u64 *ret1, u64 *ret2, u64 *ret3)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
struct scm_extra_arg {
|
|
union {
|
|
u32 args32[N_EXT_SCM_ARGS];
|
|
u64 args64[N_EXT_SCM_ARGS];
|
|
};
|
|
};
|
|
|
|
static enum scm_interface_version {
|
|
SCM_UNKNOWN,
|
|
SCM_LEGACY,
|
|
SCM_ARMV8_32,
|
|
SCM_ARMV8_64,
|
|
} scm_version = SCM_UNKNOWN;
|
|
|
|
/* This will be set to specify SMC32 or SMC64 */
|
|
static u32 scm_version_mask;
|
|
|
|
bool is_scm_armv8(void)
|
|
{
|
|
int ret;
|
|
u64 ret1, x0;
|
|
|
|
if (likely(scm_version != SCM_UNKNOWN))
|
|
return (scm_version == SCM_ARMV8_32) ||
|
|
(scm_version == SCM_ARMV8_64);
|
|
/*
|
|
* This is a one time check that runs on the first ever
|
|
* invocation of is_scm_armv8. We might be called in atomic
|
|
* context so no mutexes etc. Also, we can't use the scm_call2
|
|
* or scm_call2_APIs directly since they depend on this init.
|
|
*/
|
|
|
|
/* First try a SMC64 call */
|
|
scm_version = SCM_ARMV8_64;
|
|
ret1 = 0;
|
|
x0 = SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD) | SMC_ATOMIC_MASK;
|
|
ret = __scm_call_armv8_64(x0 | SMC64_MASK, SCM_ARGS(1), x0, 0, 0, 0,
|
|
&ret1, NULL, NULL);
|
|
if (ret || !ret1) {
|
|
/* Try SMC32 call */
|
|
ret1 = 0;
|
|
ret = __scm_call_armv8_32(x0, SCM_ARGS(1), x0, 0, 0, 0,
|
|
&ret1, NULL, NULL);
|
|
if (ret || !ret1)
|
|
scm_version = SCM_LEGACY;
|
|
else
|
|
scm_version = SCM_ARMV8_32;
|
|
} else
|
|
scm_version_mask = SMC64_MASK;
|
|
|
|
pr_debug("scm_call: scm version is %x, mask is %x\n", scm_version,
|
|
scm_version_mask);
|
|
|
|
return (scm_version == SCM_ARMV8_32) ||
|
|
(scm_version == SCM_ARMV8_64);
|
|
}
|
|
EXPORT_SYMBOL(is_scm_armv8);
|
|
|
|
/*
|
|
* If there are more than N_REGISTER_ARGS, allocate a buffer and place
|
|
* the additional arguments in it. The extra argument buffer will be
|
|
* pointed to by X5.
|
|
*/
|
|
static int allocate_extra_arg_buffer(struct scm_desc *desc, gfp_t flags)
|
|
{
|
|
int i, j;
|
|
struct scm_extra_arg *argbuf;
|
|
int arglen = desc->arginfo & 0xf;
|
|
size_t argbuflen = PAGE_ALIGN(sizeof(struct scm_extra_arg));
|
|
|
|
desc->x5 = desc->args[FIRST_EXT_ARG_IDX];
|
|
|
|
if (likely(arglen <= N_REGISTER_ARGS)) {
|
|
desc->extra_arg_buf = NULL;
|
|
return 0;
|
|
}
|
|
|
|
argbuf = kzalloc(argbuflen, flags);
|
|
if (!argbuf) {
|
|
pr_err("scm_call: failed to alloc mem for extended argument buffer\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
desc->extra_arg_buf = argbuf;
|
|
|
|
j = FIRST_EXT_ARG_IDX;
|
|
if (scm_version == SCM_ARMV8_64)
|
|
for (i = 0; i < N_EXT_SCM_ARGS; i++)
|
|
argbuf->args64[i] = desc->args[j++];
|
|
else
|
|
for (i = 0; i < N_EXT_SCM_ARGS; i++)
|
|
argbuf->args32[i] = desc->args[j++];
|
|
desc->x5 = virt_to_phys(argbuf);
|
|
__cpuc_flush_dcache_area(argbuf, argbuflen);
|
|
outer_flush_range(virt_to_phys(argbuf),
|
|
virt_to_phys(argbuf) + argbuflen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* scm_call2() - Invoke a syscall in the secure world
|
|
* @fn_id: The function ID for this syscall
|
|
* @desc: Descriptor structure containing arguments and return values
|
|
*
|
|
* Sends a command to the SCM and waits for the command to finish processing.
|
|
* This should *only* be called in pre-emptible context.
|
|
*
|
|
* A note on cache maintenance:
|
|
* Note that any buffers that are expected to be accessed by the secure world
|
|
* must be flushed before invoking scm_call and invalidated in the cache
|
|
* immediately after scm_call returns. An important point that must be noted
|
|
* is that on ARMV8 architectures, invalidation actually also causes a dirty
|
|
* cache line to be cleaned (flushed + unset-dirty-bit). Therefore it is of
|
|
* paramount importance that the buffer be flushed before invoking scm_call2,
|
|
* even if you don't care about the contents of that buffer.
|
|
*
|
|
* Note that cache maintenance on the argument buffer (desc->args) is taken care
|
|
* of by scm_call2; however, callers are responsible for any other cached
|
|
* buffers passed over to the secure world.
|
|
*/
|
|
int scm_call2(u32 fn_id, struct scm_desc *desc)
|
|
{
|
|
int arglen = desc->arginfo & 0xf;
|
|
int ret, retry_count = 0;
|
|
u64 x0;
|
|
|
|
if (unlikely(!is_scm_armv8()))
|
|
return -ENODEV;
|
|
|
|
ret = allocate_extra_arg_buffer(desc, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
x0 = fn_id | scm_version_mask;
|
|
|
|
do {
|
|
mutex_lock(&scm_lock);
|
|
|
|
if (SCM_SVC_ID(fn_id) == SCM_SVC_LMH)
|
|
mutex_lock(&scm_lmh_lock);
|
|
|
|
desc->ret[0] = desc->ret[1] = desc->ret[2] = 0;
|
|
|
|
pr_debug("scm_call: func id %#llx, args: %#x, %#llx, %#llx, %#llx, %#llx\n",
|
|
x0, desc->arginfo, desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5);
|
|
|
|
if (scm_version == SCM_ARMV8_64)
|
|
ret = __scm_call_armv8_64(x0, desc->arginfo,
|
|
desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5,
|
|
&desc->ret[0], &desc->ret[1],
|
|
&desc->ret[2]);
|
|
else
|
|
ret = __scm_call_armv8_32(x0, desc->arginfo,
|
|
desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5,
|
|
&desc->ret[0], &desc->ret[1],
|
|
&desc->ret[2]);
|
|
|
|
if (SCM_SVC_ID(fn_id) == SCM_SVC_LMH)
|
|
mutex_unlock(&scm_lmh_lock);
|
|
|
|
mutex_unlock(&scm_lock);
|
|
|
|
if (ret == SCM_V2_EBUSY)
|
|
msleep(SCM_EBUSY_WAIT_MS);
|
|
} while (ret == SCM_V2_EBUSY && (retry_count++ < SCM_EBUSY_MAX_RETRY));
|
|
|
|
if (ret < 0)
|
|
pr_err("scm_call failed: func id %#llx, arginfo: %#x, args: %#llx, %#llx, %#llx, %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n",
|
|
x0, desc->arginfo, desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5, ret, desc->ret[0],
|
|
desc->ret[1], desc->ret[2]);
|
|
|
|
if (arglen > N_REGISTER_ARGS)
|
|
kfree(desc->extra_arg_buf);
|
|
if (ret < 0)
|
|
return scm_remap_error(ret);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call2);
|
|
|
|
/**
|
|
* scm_call2_atomic() - Invoke a syscall in the secure world
|
|
*
|
|
* Similar to scm_call2 except that this can be invoked in atomic context.
|
|
* There is also no retry mechanism implemented. Please ensure that the
|
|
* secure world syscall can be executed in such a context and can complete
|
|
* in a timely manner.
|
|
*/
|
|
int scm_call2_atomic(u32 fn_id, struct scm_desc *desc)
|
|
{
|
|
int arglen = desc->arginfo & 0xf;
|
|
int ret;
|
|
u64 x0;
|
|
|
|
if (unlikely(!is_scm_armv8()))
|
|
return -ENODEV;
|
|
|
|
ret = allocate_extra_arg_buffer(desc, GFP_ATOMIC);
|
|
if (ret)
|
|
return ret;
|
|
|
|
x0 = fn_id | BIT(SMC_ATOMIC_SYSCALL) | scm_version_mask;
|
|
|
|
pr_debug("scm_call: func id %#llx, args: %#x, %#llx, %#llx, %#llx, %#llx\n",
|
|
x0, desc->arginfo, desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5);
|
|
|
|
if (scm_version == SCM_ARMV8_64)
|
|
ret = __scm_call_armv8_64(x0, desc->arginfo, desc->args[0],
|
|
desc->args[1], desc->args[2],
|
|
desc->x5, &desc->ret[0],
|
|
&desc->ret[1], &desc->ret[2]);
|
|
else
|
|
ret = __scm_call_armv8_32(x0, desc->arginfo, desc->args[0],
|
|
desc->args[1], desc->args[2],
|
|
desc->x5, &desc->ret[0],
|
|
&desc->ret[1], &desc->ret[2]);
|
|
if (ret < 0)
|
|
pr_err("scm_call failed: func id %#llx, arginfo: %#x, args: %#llx, %#llx, %#llx, %#llx, ret: %d, syscall returns: %#llx, %#llx, %#llx\n",
|
|
x0, desc->arginfo, desc->args[0], desc->args[1],
|
|
desc->args[2], desc->x5, ret, desc->ret[0],
|
|
desc->ret[1], desc->ret[2]);
|
|
|
|
if (arglen > N_REGISTER_ARGS)
|
|
kfree(desc->extra_arg_buf);
|
|
if (ret < 0)
|
|
return scm_remap_error(ret);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* scm_call() - Send an SCM command
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @cmd_buf: command buffer
|
|
* @cmd_len: length of the command buffer
|
|
* @resp_buf: response buffer
|
|
* @resp_len: length of the response buffer
|
|
*
|
|
* Sends a command to the SCM and waits for the command to finish processing.
|
|
*
|
|
* A note on cache maintenance:
|
|
* Note that any buffers that are expected to be accessed by the secure world
|
|
* must be flushed before invoking scm_call and invalidated in the cache
|
|
* immediately after scm_call returns. Cache maintenance on the command and
|
|
* response buffers is taken care of by scm_call; however, callers are
|
|
* responsible for any other cached buffers passed over to the secure world.
|
|
*/
|
|
int scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf, size_t cmd_len,
|
|
void *resp_buf, size_t resp_len)
|
|
{
|
|
struct scm_command *cmd;
|
|
int ret;
|
|
size_t len = SCM_BUF_LEN(cmd_len, resp_len);
|
|
|
|
if (cmd_len > len || resp_len > len)
|
|
return -EINVAL;
|
|
|
|
cmd = kzalloc(PAGE_ALIGN(len), GFP_KERNEL);
|
|
if (!cmd)
|
|
return -ENOMEM;
|
|
|
|
ret = scm_call_common(svc_id, cmd_id, cmd_buf, cmd_len, resp_buf,
|
|
resp_len, cmd, len);
|
|
if (unlikely(ret == SCM_EBUSY))
|
|
ret = _scm_call_retry(svc_id, cmd_id, cmd_buf, cmd_len,
|
|
resp_buf, resp_len, cmd, PAGE_ALIGN(len));
|
|
kfree(cmd);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(scm_call);
|
|
|
|
#define SCM_CLASS_REGISTER (0x2 << 8)
|
|
#define SCM_MASK_IRQS BIT(5)
|
|
#define SCM_ATOMIC(svc, cmd, n) (((((svc) << 10)|((cmd) & 0x3ff)) << 12) | \
|
|
SCM_CLASS_REGISTER | \
|
|
SCM_MASK_IRQS | \
|
|
(n & 0xf))
|
|
|
|
/**
|
|
* scm_call_atomic1() - Send an atomic SCM command with one argument
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @arg1: first argument
|
|
*
|
|
* This shall only be used with commands that are guaranteed to be
|
|
* uninterruptable, atomic and SMP safe.
|
|
*/
|
|
s32 scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
|
|
{
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 1);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R0_STR)
|
|
__asmeq("%2", R1_STR)
|
|
__asmeq("%3", R2_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0)
|
|
: "r" (r0), "r" (r1), "r" (r2)
|
|
: "r3");
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic1);
|
|
|
|
/**
|
|
* scm_call_atomic1_1() - SCM command with one argument and one return value
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @arg1: first argument
|
|
* @ret1: first return value
|
|
*
|
|
* This shall only be used with commands that are guaranteed to be
|
|
* uninterruptable, atomic and SMP safe.
|
|
*/
|
|
s32 scm_call_atomic1_1(u32 svc, u32 cmd, u32 arg1, u32 *ret1)
|
|
{
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 1);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R1_STR)
|
|
__asmeq("%2", R0_STR)
|
|
__asmeq("%3", R1_STR)
|
|
__asmeq("%4", R2_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0), "=r" (r1)
|
|
: "r" (r0), "r" (r1), "r" (r2)
|
|
: "r3");
|
|
if (ret1)
|
|
*ret1 = r1;
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic1_1);
|
|
|
|
/**
|
|
* scm_call_atomic2() - Send an atomic SCM command with two arguments
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @arg1: first argument
|
|
* @arg2: second argument
|
|
*
|
|
* This shall only be used with commands that are guaranteed to be
|
|
* uninterruptable, atomic and SMP safe.
|
|
*/
|
|
s32 scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2)
|
|
{
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 2);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
register u32 r3 asm("r3") = arg2;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R0_STR)
|
|
__asmeq("%2", R1_STR)
|
|
__asmeq("%3", R2_STR)
|
|
__asmeq("%4", R3_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0)
|
|
: "r" (r0), "r" (r1), "r" (r2), "r" (r3));
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic2);
|
|
|
|
/**
|
|
* scm_call_atomic3() - Send an atomic SCM command with three arguments
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @arg1: first argument
|
|
* @arg2: second argument
|
|
* @arg3: third argument
|
|
*
|
|
* This shall only be used with commands that are guaranteed to be
|
|
* uninterruptable, atomic and SMP safe.
|
|
*/
|
|
s32 scm_call_atomic3(u32 svc, u32 cmd, u32 arg1, u32 arg2, u32 arg3)
|
|
{
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 3);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
register u32 r3 asm("r3") = arg2;
|
|
register u32 r4 asm("r4") = arg3;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R0_STR)
|
|
__asmeq("%2", R1_STR)
|
|
__asmeq("%3", R2_STR)
|
|
__asmeq("%4", R3_STR)
|
|
__asmeq("%5", R4_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0)
|
|
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4));
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic3);
|
|
|
|
s32 scm_call_atomic4_3(u32 svc, u32 cmd, u32 arg1, u32 arg2,
|
|
u32 arg3, u32 arg4, u32 *ret1, u32 *ret2)
|
|
{
|
|
int ret;
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 4);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
register u32 r3 asm("r3") = arg2;
|
|
register u32 r4 asm("r4") = arg3;
|
|
register u32 r5 asm("r5") = arg4;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R1_STR)
|
|
__asmeq("%2", R2_STR)
|
|
__asmeq("%3", R0_STR)
|
|
__asmeq("%4", R1_STR)
|
|
__asmeq("%5", R2_STR)
|
|
__asmeq("%6", R3_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0), "=r" (r1), "=r" (r2)
|
|
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5));
|
|
ret = r0;
|
|
if (ret1)
|
|
*ret1 = r1;
|
|
if (ret2)
|
|
*ret2 = r2;
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic4_3);
|
|
|
|
/**
|
|
* scm_call_atomic5_3() - SCM command with five argument and three return value
|
|
* @svc_id: service identifier
|
|
* @cmd_id: command identifier
|
|
* @arg1: first argument
|
|
* @arg2: second argument
|
|
* @arg3: third argument
|
|
* @arg4: fourth argument
|
|
* @arg5: fifth argument
|
|
* @ret1: first return value
|
|
* @ret2: second return value
|
|
* @ret3: third return value
|
|
*
|
|
* This shall only be used with commands that are guaranteed to be
|
|
* uninterruptable, atomic and SMP safe.
|
|
*/
|
|
s32 scm_call_atomic5_3(u32 svc, u32 cmd, u32 arg1, u32 arg2,
|
|
u32 arg3, u32 arg4, u32 arg5, u32 *ret1, u32 *ret2, u32 *ret3)
|
|
{
|
|
int ret;
|
|
int context_id;
|
|
register u32 r0 asm("r0") = SCM_ATOMIC(svc, cmd, 5);
|
|
register u32 r1 asm("r1") = (uintptr_t)&context_id;
|
|
register u32 r2 asm("r2") = arg1;
|
|
register u32 r3 asm("r3") = arg2;
|
|
register u32 r4 asm("r4") = arg3;
|
|
register u32 r5 asm("r5") = arg4;
|
|
register u32 r6 asm("r6") = arg5;
|
|
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R1_STR)
|
|
__asmeq("%2", R2_STR)
|
|
__asmeq("%3", R3_STR)
|
|
__asmeq("%4", R0_STR)
|
|
__asmeq("%5", R1_STR)
|
|
__asmeq("%6", R2_STR)
|
|
__asmeq("%7", R3_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0), "=r" (r1), "=r" (r2), "=r" (r3)
|
|
: "r" (r0), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5),
|
|
"r" (r6));
|
|
ret = r0;
|
|
|
|
if (ret1)
|
|
*ret1 = r1;
|
|
if (ret2)
|
|
*ret2 = r2;
|
|
if (ret3)
|
|
*ret3 = r3;
|
|
return r0;
|
|
}
|
|
EXPORT_SYMBOL(scm_call_atomic5_3);
|
|
|
|
u32 scm_get_version(void)
|
|
{
|
|
int context_id;
|
|
static u32 version = -1;
|
|
register u32 r0 asm("r0");
|
|
register u32 r1 asm("r1");
|
|
|
|
if (version != -1)
|
|
return version;
|
|
|
|
mutex_lock(&scm_lock);
|
|
|
|
r0 = 0x1 << 8;
|
|
r1 = (uintptr_t)&context_id;
|
|
do {
|
|
asm volatile(
|
|
__asmeq("%0", R0_STR)
|
|
__asmeq("%1", R1_STR)
|
|
__asmeq("%2", R0_STR)
|
|
__asmeq("%3", R1_STR)
|
|
#ifdef REQUIRES_SEC
|
|
".arch_extension sec\n"
|
|
#endif
|
|
"smc #0\n"
|
|
: "=r" (r0), "=r" (r1)
|
|
: "r" (r0), "r" (r1)
|
|
: "r2", "r3");
|
|
} while (r0 == SCM_INTERRUPTED);
|
|
|
|
version = r1;
|
|
mutex_unlock(&scm_lock);
|
|
|
|
return version;
|
|
}
|
|
EXPORT_SYMBOL(scm_get_version);
|
|
|
|
#define SCM_IO_READ 0x1
|
|
#define SCM_IO_WRITE 0x2
|
|
|
|
u32 scm_io_read(phys_addr_t address)
|
|
{
|
|
if (!is_scm_armv8()) {
|
|
return scm_call_atomic1(SCM_SVC_IO, SCM_IO_READ, address);
|
|
} else {
|
|
struct scm_desc desc = {
|
|
.args[0] = address,
|
|
.arginfo = SCM_ARGS(1),
|
|
};
|
|
scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_READ), &desc);
|
|
return desc.ret[0];
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(scm_io_read);
|
|
|
|
int scm_io_write(phys_addr_t address, u32 val)
|
|
{
|
|
int ret;
|
|
|
|
if (!is_scm_armv8()) {
|
|
ret = scm_call_atomic2(SCM_SVC_IO, SCM_IO_WRITE, address, val);
|
|
} else {
|
|
struct scm_desc desc = {
|
|
.args[0] = address,
|
|
.args[1] = val,
|
|
.arginfo = SCM_ARGS(2),
|
|
};
|
|
ret = scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_IO, SCM_IO_WRITE),
|
|
&desc);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(scm_io_write);
|
|
|
|
int scm_is_call_available(u32 svc_id, u32 cmd_id)
|
|
{
|
|
int ret;
|
|
struct scm_desc desc = {0};
|
|
|
|
if (!is_scm_armv8()) {
|
|
u32 ret_val = 0;
|
|
u32 svc_cmd = (svc_id << 10) | cmd_id;
|
|
|
|
ret = scm_call(SCM_SVC_INFO, IS_CALL_AVAIL_CMD, &svc_cmd,
|
|
sizeof(svc_cmd), &ret_val, sizeof(ret_val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
return ret_val;
|
|
}
|
|
desc.arginfo = SCM_ARGS(1);
|
|
desc.args[0] = SCM_SIP_FNID(svc_id, cmd_id);
|
|
ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, IS_CALL_AVAIL_CMD), &desc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return desc.ret[0];
|
|
}
|
|
EXPORT_SYMBOL(scm_is_call_available);
|
|
|
|
#define GET_FEAT_VERSION_CMD 3
|
|
int scm_get_feat_version(u32 feat)
|
|
{
|
|
struct scm_desc desc = {0};
|
|
int ret;
|
|
|
|
if (!is_scm_armv8()) {
|
|
if (scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD)) {
|
|
u32 version;
|
|
if (!scm_call(SCM_SVC_INFO, GET_FEAT_VERSION_CMD, &feat,
|
|
sizeof(feat), &version, sizeof(version)))
|
|
return version;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ret = scm_is_call_available(SCM_SVC_INFO, GET_FEAT_VERSION_CMD);
|
|
if (ret <= 0)
|
|
return 0;
|
|
|
|
desc.args[0] = feat;
|
|
desc.arginfo = SCM_ARGS(1);
|
|
ret = scm_call2(SCM_SIP_FNID(SCM_SVC_INFO, GET_FEAT_VERSION_CMD),
|
|
&desc);
|
|
if (!ret)
|
|
return desc.ret[0];
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scm_get_feat_version);
|
|
|
|
#define RESTORE_SEC_CFG 2
|
|
int scm_restore_sec_cfg(u32 device_id, u32 spare, int *scm_ret)
|
|
{
|
|
struct scm_desc desc = {0};
|
|
int ret;
|
|
struct restore_sec_cfg {
|
|
u32 device_id;
|
|
u32 spare;
|
|
} cfg;
|
|
|
|
cfg.device_id = device_id;
|
|
cfg.spare = spare;
|
|
|
|
if (IS_ERR_OR_NULL(scm_ret))
|
|
return -EINVAL;
|
|
|
|
if (!is_scm_armv8())
|
|
return scm_call(SCM_SVC_MP, RESTORE_SEC_CFG, &cfg, sizeof(cfg),
|
|
scm_ret, sizeof(*scm_ret));
|
|
|
|
desc.args[0] = device_id;
|
|
desc.args[1] = spare;
|
|
desc.arginfo = SCM_ARGS(2);
|
|
|
|
ret = scm_call2(SCM_SIP_FNID(SCM_SVC_MP, RESTORE_SEC_CFG), &desc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*scm_ret = desc.ret[0];
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scm_restore_sec_cfg);
|