1128 lines
31 KiB
C
1128 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2017-2018, Intel Corporation
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*/
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/genalloc.h>
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#include <linux/io.h>
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#include <linux/kfifo.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/firmware/intel/stratix10-smc.h>
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#include <linux/firmware/intel/stratix10-svc-client.h>
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#include <linux/types.h>
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/**
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* SVC_NUM_DATA_IN_FIFO - number of struct stratix10_svc_data in the FIFO
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*
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* SVC_NUM_CHANNEL - number of channel supported by service layer driver
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*
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* FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS - claim back the submitted buffer(s)
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* from the secure world for FPGA manager to reuse, or to free the buffer(s)
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* when all bit-stream data had be send.
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*
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* FPGA_CONFIG_STATUS_TIMEOUT_SEC - poll the FPGA configuration status,
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* service layer will return error to FPGA manager when timeout occurs,
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* timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC.
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*/
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#define SVC_NUM_DATA_IN_FIFO 32
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#define SVC_NUM_CHANNEL 2
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#define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS 200
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#define FPGA_CONFIG_STATUS_TIMEOUT_SEC 30
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/* stratix10 service layer clients */
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#define STRATIX10_RSU "stratix10-rsu"
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typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long,
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struct arm_smccc_res *);
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struct stratix10_svc_chan;
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/**
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* struct stratix10_svc - svc private data
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* @stratix10_svc_rsu: pointer to stratix10 RSU device
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*/
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struct stratix10_svc {
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struct platform_device *stratix10_svc_rsu;
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};
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/**
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* struct stratix10_svc_sh_memory - service shared memory structure
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* @sync_complete: state for a completion
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* @addr: physical address of shared memory block
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* @size: size of shared memory block
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* @invoke_fn: function to issue secure monitor or hypervisor call
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*
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* This struct is used to save physical address and size of shared memory
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* block. The shared memory blocked is allocated by secure monitor software
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* at secure world.
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*
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* Service layer driver uses the physical address and size to create a memory
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* pool, then allocates data buffer from that memory pool for service client.
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*/
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struct stratix10_svc_sh_memory {
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struct completion sync_complete;
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unsigned long addr;
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unsigned long size;
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svc_invoke_fn *invoke_fn;
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};
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/**
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* struct stratix10_svc_data_mem - service memory structure
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* @vaddr: virtual address
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* @paddr: physical address
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* @size: size of memory
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* @node: link list head node
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*
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* This struct is used in a list that keeps track of buffers which have
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* been allocated or freed from the memory pool. Service layer driver also
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* uses this struct to transfer physical address to virtual address.
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*/
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struct stratix10_svc_data_mem {
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void *vaddr;
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phys_addr_t paddr;
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size_t size;
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struct list_head node;
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};
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/**
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* struct stratix10_svc_data - service data structure
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* @chan: service channel
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* @paddr: playload physical address
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* @size: playload size
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* @command: service command requested by client
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* @flag: configuration type (full or partial)
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* @arg: args to be passed via registers and not physically mapped buffers
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*
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* This struct is used in service FIFO for inter-process communication.
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*/
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struct stratix10_svc_data {
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struct stratix10_svc_chan *chan;
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phys_addr_t paddr;
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size_t size;
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u32 command;
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u32 flag;
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u64 arg[3];
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};
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/**
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* struct stratix10_svc_controller - service controller
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* @dev: device
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* @chans: array of service channels
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* @num_chans: number of channels in 'chans' array
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* @num_active_client: number of active service client
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* @node: list management
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* @genpool: memory pool pointing to the memory region
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* @task: pointer to the thread task which handles SMC or HVC call
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* @svc_fifo: a queue for storing service message data
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* @complete_status: state for completion
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* @svc_fifo_lock: protect access to service message data queue
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* @invoke_fn: function to issue secure monitor call or hypervisor call
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*
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* This struct is used to create communication channels for service clients, to
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* handle secure monitor or hypervisor call.
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*/
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struct stratix10_svc_controller {
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struct device *dev;
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struct stratix10_svc_chan *chans;
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int num_chans;
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int num_active_client;
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struct list_head node;
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struct gen_pool *genpool;
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struct task_struct *task;
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struct kfifo svc_fifo;
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struct completion complete_status;
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spinlock_t svc_fifo_lock;
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svc_invoke_fn *invoke_fn;
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};
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/**
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* struct stratix10_svc_chan - service communication channel
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* @ctrl: pointer to service controller which is the provider of this channel
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* @scl: pointer to service client which owns the channel
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* @name: service client name associated with the channel
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* @lock: protect access to the channel
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*
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* This struct is used by service client to communicate with service layer, each
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* service client has its own channel created by service controller.
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*/
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struct stratix10_svc_chan {
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struct stratix10_svc_controller *ctrl;
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struct stratix10_svc_client *scl;
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char *name;
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spinlock_t lock;
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};
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static LIST_HEAD(svc_ctrl);
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static LIST_HEAD(svc_data_mem);
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/**
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* svc_pa_to_va() - translate physical address to virtual address
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* @addr: to be translated physical address
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*
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* Return: valid virtual address or NULL if the provided physical
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* address doesn't exist.
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*/
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static void *svc_pa_to_va(unsigned long addr)
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{
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struct stratix10_svc_data_mem *pmem;
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pr_debug("claim back P-addr=0x%016x\n", (unsigned int)addr);
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list_for_each_entry(pmem, &svc_data_mem, node)
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if (pmem->paddr == addr)
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return pmem->vaddr;
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/* physical address is not found */
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return NULL;
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}
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/**
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* svc_thread_cmd_data_claim() - claim back buffer from the secure world
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* @ctrl: pointer to service layer controller
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* @p_data: pointer to service data structure
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* @cb_data: pointer to callback data structure to service client
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*
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* Claim back the submitted buffers from the secure world and pass buffer
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* back to service client (FPGA manager, etc) for reuse.
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*/
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static void svc_thread_cmd_data_claim(struct stratix10_svc_controller *ctrl,
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struct stratix10_svc_data *p_data,
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struct stratix10_svc_cb_data *cb_data)
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{
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struct arm_smccc_res res;
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unsigned long timeout;
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reinit_completion(&ctrl->complete_status);
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timeout = msecs_to_jiffies(FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS);
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pr_debug("%s: claim back the submitted buffer\n", __func__);
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do {
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ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
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0, 0, 0, 0, 0, 0, 0, &res);
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if (res.a0 == INTEL_SIP_SMC_STATUS_OK) {
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if (!res.a1) {
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complete(&ctrl->complete_status);
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break;
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}
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cb_data->status = BIT(SVC_STATUS_BUFFER_DONE);
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cb_data->kaddr1 = svc_pa_to_va(res.a1);
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cb_data->kaddr2 = (res.a2) ?
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svc_pa_to_va(res.a2) : NULL;
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cb_data->kaddr3 = (res.a3) ?
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svc_pa_to_va(res.a3) : NULL;
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p_data->chan->scl->receive_cb(p_data->chan->scl,
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cb_data);
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} else {
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pr_debug("%s: secure world busy, polling again\n",
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__func__);
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}
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} while (res.a0 == INTEL_SIP_SMC_STATUS_OK ||
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res.a0 == INTEL_SIP_SMC_STATUS_BUSY ||
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wait_for_completion_timeout(&ctrl->complete_status, timeout));
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}
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/**
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* svc_thread_cmd_config_status() - check configuration status
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* @ctrl: pointer to service layer controller
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* @p_data: pointer to service data structure
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* @cb_data: pointer to callback data structure to service client
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*
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* Check whether the secure firmware at secure world has finished the FPGA
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* configuration, and then inform FPGA manager the configuration status.
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*/
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static void svc_thread_cmd_config_status(struct stratix10_svc_controller *ctrl,
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struct stratix10_svc_data *p_data,
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struct stratix10_svc_cb_data *cb_data)
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{
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struct arm_smccc_res res;
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int count_in_sec;
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cb_data->kaddr1 = NULL;
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cb_data->kaddr2 = NULL;
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cb_data->kaddr3 = NULL;
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cb_data->status = BIT(SVC_STATUS_ERROR);
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pr_debug("%s: polling config status\n", __func__);
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count_in_sec = FPGA_CONFIG_STATUS_TIMEOUT_SEC;
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while (count_in_sec) {
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ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE,
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0, 0, 0, 0, 0, 0, 0, &res);
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if ((res.a0 == INTEL_SIP_SMC_STATUS_OK) ||
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(res.a0 == INTEL_SIP_SMC_STATUS_ERROR))
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break;
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/*
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* configuration is still in progress, wait one second then
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* poll again
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*/
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msleep(1000);
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count_in_sec--;
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}
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if (res.a0 == INTEL_SIP_SMC_STATUS_OK && count_in_sec)
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cb_data->status = BIT(SVC_STATUS_COMPLETED);
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p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
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}
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/**
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* svc_thread_recv_status_ok() - handle the successful status
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* @p_data: pointer to service data structure
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* @cb_data: pointer to callback data structure to service client
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* @res: result from SMC or HVC call
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*
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* Send back the correspond status to the service clients.
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*/
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static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
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struct stratix10_svc_cb_data *cb_data,
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struct arm_smccc_res res)
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{
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cb_data->kaddr1 = NULL;
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cb_data->kaddr2 = NULL;
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cb_data->kaddr3 = NULL;
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switch (p_data->command) {
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case COMMAND_RECONFIG:
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case COMMAND_RSU_UPDATE:
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case COMMAND_RSU_NOTIFY:
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cb_data->status = BIT(SVC_STATUS_OK);
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break;
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case COMMAND_RECONFIG_DATA_SUBMIT:
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cb_data->status = BIT(SVC_STATUS_BUFFER_SUBMITTED);
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break;
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case COMMAND_RECONFIG_STATUS:
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cb_data->status = BIT(SVC_STATUS_COMPLETED);
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break;
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case COMMAND_RSU_RETRY:
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case COMMAND_RSU_MAX_RETRY:
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cb_data->status = BIT(SVC_STATUS_OK);
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cb_data->kaddr1 = &res.a1;
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break;
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case COMMAND_RSU_DCMF_VERSION:
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cb_data->status = BIT(SVC_STATUS_OK);
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cb_data->kaddr1 = &res.a1;
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cb_data->kaddr2 = &res.a2;
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break;
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default:
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pr_warn("it shouldn't happen\n");
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break;
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}
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pr_debug("%s: call receive_cb\n", __func__);
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p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
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}
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/**
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* svc_normal_to_secure_thread() - the function to run in the kthread
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* @data: data pointer for kthread function
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*
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* Service layer driver creates stratix10_svc_smc_hvc_call kthread on CPU
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* node 0, its function stratix10_svc_secure_call_thread is used to handle
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* SMC or HVC calls between kernel driver and secure monitor software.
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*
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* Return: 0 for success or -ENOMEM on error.
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*/
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static int svc_normal_to_secure_thread(void *data)
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{
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struct stratix10_svc_controller
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*ctrl = (struct stratix10_svc_controller *)data;
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struct stratix10_svc_data *pdata;
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struct stratix10_svc_cb_data *cbdata;
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struct arm_smccc_res res;
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unsigned long a0, a1, a2;
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int ret_fifo = 0;
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pdata = kmalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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cbdata = kmalloc(sizeof(*cbdata), GFP_KERNEL);
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if (!cbdata) {
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kfree(pdata);
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return -ENOMEM;
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}
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/* default set, to remove build warning */
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a0 = INTEL_SIP_SMC_FPGA_CONFIG_LOOPBACK;
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a1 = 0;
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a2 = 0;
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pr_debug("smc_hvc_shm_thread is running\n");
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while (!kthread_should_stop()) {
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ret_fifo = kfifo_out_spinlocked(&ctrl->svc_fifo,
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pdata, sizeof(*pdata),
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&ctrl->svc_fifo_lock);
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if (!ret_fifo)
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continue;
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pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n",
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(unsigned int)pdata->paddr, pdata->command,
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(unsigned int)pdata->size);
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switch (pdata->command) {
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case COMMAND_RECONFIG_DATA_CLAIM:
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svc_thread_cmd_data_claim(ctrl, pdata, cbdata);
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continue;
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case COMMAND_RECONFIG:
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a0 = INTEL_SIP_SMC_FPGA_CONFIG_START;
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pr_debug("conf_type=%u\n", (unsigned int)pdata->flag);
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a1 = pdata->flag;
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a2 = 0;
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break;
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case COMMAND_RECONFIG_DATA_SUBMIT:
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a0 = INTEL_SIP_SMC_FPGA_CONFIG_WRITE;
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a1 = (unsigned long)pdata->paddr;
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a2 = (unsigned long)pdata->size;
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break;
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case COMMAND_RECONFIG_STATUS:
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a0 = INTEL_SIP_SMC_FPGA_CONFIG_ISDONE;
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a1 = 0;
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a2 = 0;
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break;
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case COMMAND_RSU_STATUS:
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a0 = INTEL_SIP_SMC_RSU_STATUS;
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a1 = 0;
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a2 = 0;
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break;
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case COMMAND_RSU_UPDATE:
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a0 = INTEL_SIP_SMC_RSU_UPDATE;
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a1 = pdata->arg[0];
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a2 = 0;
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break;
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case COMMAND_RSU_NOTIFY:
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a0 = INTEL_SIP_SMC_RSU_NOTIFY;
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a1 = pdata->arg[0];
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a2 = 0;
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break;
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case COMMAND_RSU_RETRY:
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a0 = INTEL_SIP_SMC_RSU_RETRY_COUNTER;
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a1 = 0;
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a2 = 0;
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break;
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case COMMAND_RSU_MAX_RETRY:
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a0 = INTEL_SIP_SMC_RSU_MAX_RETRY;
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a1 = 0;
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a2 = 0;
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break;
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case COMMAND_RSU_DCMF_VERSION:
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a0 = INTEL_SIP_SMC_RSU_DCMF_VERSION;
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a1 = 0;
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a2 = 0;
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break;
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default:
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pr_warn("it shouldn't happen\n");
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break;
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}
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pr_debug("%s: before SMC call -- a0=0x%016x a1=0x%016x",
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__func__, (unsigned int)a0, (unsigned int)a1);
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pr_debug(" a2=0x%016x\n", (unsigned int)a2);
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ctrl->invoke_fn(a0, a1, a2, 0, 0, 0, 0, 0, &res);
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pr_debug("%s: after SMC call -- res.a0=0x%016x",
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__func__, (unsigned int)res.a0);
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pr_debug(" res.a1=0x%016x, res.a2=0x%016x",
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(unsigned int)res.a1, (unsigned int)res.a2);
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pr_debug(" res.a3=0x%016x\n", (unsigned int)res.a3);
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if (pdata->command == COMMAND_RSU_STATUS) {
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if (res.a0 == INTEL_SIP_SMC_RSU_ERROR)
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cbdata->status = BIT(SVC_STATUS_ERROR);
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else
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cbdata->status = BIT(SVC_STATUS_OK);
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cbdata->kaddr1 = &res;
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cbdata->kaddr2 = NULL;
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cbdata->kaddr3 = NULL;
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pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata);
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continue;
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}
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switch (res.a0) {
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case INTEL_SIP_SMC_STATUS_OK:
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svc_thread_recv_status_ok(pdata, cbdata, res);
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break;
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case INTEL_SIP_SMC_STATUS_BUSY:
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switch (pdata->command) {
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case COMMAND_RECONFIG_DATA_SUBMIT:
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svc_thread_cmd_data_claim(ctrl,
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pdata, cbdata);
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break;
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case COMMAND_RECONFIG_STATUS:
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svc_thread_cmd_config_status(ctrl,
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pdata, cbdata);
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break;
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default:
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pr_warn("it shouldn't happen\n");
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break;
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}
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break;
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case INTEL_SIP_SMC_STATUS_REJECTED:
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pr_debug("%s: STATUS_REJECTED\n", __func__);
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break;
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case INTEL_SIP_SMC_STATUS_ERROR:
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case INTEL_SIP_SMC_RSU_ERROR:
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pr_err("%s: STATUS_ERROR\n", __func__);
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cbdata->status = BIT(SVC_STATUS_ERROR);
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cbdata->kaddr1 = NULL;
|
|
cbdata->kaddr2 = NULL;
|
|
cbdata->kaddr3 = NULL;
|
|
pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata);
|
|
break;
|
|
default:
|
|
pr_warn("Secure firmware doesn't support...\n");
|
|
|
|
/*
|
|
* be compatible with older version firmware which
|
|
* doesn't support RSU notify or retry
|
|
*/
|
|
if ((pdata->command == COMMAND_RSU_RETRY) ||
|
|
(pdata->command == COMMAND_RSU_MAX_RETRY) ||
|
|
(pdata->command == COMMAND_RSU_NOTIFY)) {
|
|
cbdata->status =
|
|
BIT(SVC_STATUS_NO_SUPPORT);
|
|
cbdata->kaddr1 = NULL;
|
|
cbdata->kaddr2 = NULL;
|
|
cbdata->kaddr3 = NULL;
|
|
pdata->chan->scl->receive_cb(
|
|
pdata->chan->scl, cbdata);
|
|
}
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
kfree(cbdata);
|
|
kfree(pdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* svc_normal_to_secure_shm_thread() - the function to run in the kthread
|
|
* @data: data pointer for kthread function
|
|
*
|
|
* Service layer driver creates stratix10_svc_smc_hvc_shm kthread on CPU
|
|
* node 0, its function stratix10_svc_secure_shm_thread is used to query the
|
|
* physical address of memory block reserved by secure monitor software at
|
|
* secure world.
|
|
*
|
|
* svc_normal_to_secure_shm_thread() calls do_exit() directly since it is a
|
|
* standlone thread for which no one will call kthread_stop() or return when
|
|
* 'kthread_should_stop()' is true.
|
|
*/
|
|
static int svc_normal_to_secure_shm_thread(void *data)
|
|
{
|
|
struct stratix10_svc_sh_memory
|
|
*sh_mem = (struct stratix10_svc_sh_memory *)data;
|
|
struct arm_smccc_res res;
|
|
|
|
/* SMC or HVC call to get shared memory info from secure world */
|
|
sh_mem->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_GET_MEM,
|
|
0, 0, 0, 0, 0, 0, 0, &res);
|
|
if (res.a0 == INTEL_SIP_SMC_STATUS_OK) {
|
|
sh_mem->addr = res.a1;
|
|
sh_mem->size = res.a2;
|
|
} else {
|
|
pr_err("%s: after SMC call -- res.a0=0x%016x", __func__,
|
|
(unsigned int)res.a0);
|
|
sh_mem->addr = 0;
|
|
sh_mem->size = 0;
|
|
}
|
|
|
|
complete(&sh_mem->sync_complete);
|
|
do_exit(0);
|
|
}
|
|
|
|
/**
|
|
* svc_get_sh_memory() - get memory block reserved by secure monitor SW
|
|
* @pdev: pointer to service layer device
|
|
* @sh_memory: pointer to service shared memory structure
|
|
*
|
|
* Return: zero for successfully getting the physical address of memory block
|
|
* reserved by secure monitor software, or negative value on error.
|
|
*/
|
|
static int svc_get_sh_memory(struct platform_device *pdev,
|
|
struct stratix10_svc_sh_memory *sh_memory)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct task_struct *sh_memory_task;
|
|
unsigned int cpu = 0;
|
|
|
|
init_completion(&sh_memory->sync_complete);
|
|
|
|
/* smc or hvc call happens on cpu 0 bound kthread */
|
|
sh_memory_task = kthread_create_on_node(svc_normal_to_secure_shm_thread,
|
|
(void *)sh_memory,
|
|
cpu_to_node(cpu),
|
|
"svc_smc_hvc_shm_thread");
|
|
if (IS_ERR(sh_memory_task)) {
|
|
dev_err(dev, "fail to create stratix10_svc_smc_shm_thread\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
wake_up_process(sh_memory_task);
|
|
|
|
if (!wait_for_completion_timeout(&sh_memory->sync_complete, 10 * HZ)) {
|
|
dev_err(dev,
|
|
"timeout to get sh-memory paras from secure world\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
if (!sh_memory->addr || !sh_memory->size) {
|
|
dev_err(dev,
|
|
"failed to get shared memory info from secure world\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev_dbg(dev, "SM software provides paddr: 0x%016x, size: 0x%08x\n",
|
|
(unsigned int)sh_memory->addr,
|
|
(unsigned int)sh_memory->size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* svc_create_memory_pool() - create a memory pool from reserved memory block
|
|
* @pdev: pointer to service layer device
|
|
* @sh_memory: pointer to service shared memory structure
|
|
*
|
|
* Return: pool allocated from reserved memory block or ERR_PTR() on error.
|
|
*/
|
|
static struct gen_pool *
|
|
svc_create_memory_pool(struct platform_device *pdev,
|
|
struct stratix10_svc_sh_memory *sh_memory)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct gen_pool *genpool;
|
|
unsigned long vaddr;
|
|
phys_addr_t paddr;
|
|
size_t size;
|
|
phys_addr_t begin;
|
|
phys_addr_t end;
|
|
void *va;
|
|
size_t page_mask = PAGE_SIZE - 1;
|
|
int min_alloc_order = 3;
|
|
int ret;
|
|
|
|
begin = roundup(sh_memory->addr, PAGE_SIZE);
|
|
end = rounddown(sh_memory->addr + sh_memory->size, PAGE_SIZE);
|
|
paddr = begin;
|
|
size = end - begin;
|
|
va = memremap(paddr, size, MEMREMAP_WC);
|
|
if (!va) {
|
|
dev_err(dev, "fail to remap shared memory\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
vaddr = (unsigned long)va;
|
|
dev_dbg(dev,
|
|
"reserved memory vaddr: %p, paddr: 0x%16x size: 0x%8x\n",
|
|
va, (unsigned int)paddr, (unsigned int)size);
|
|
if ((vaddr & page_mask) || (paddr & page_mask) ||
|
|
(size & page_mask)) {
|
|
dev_err(dev, "page is not aligned\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
genpool = gen_pool_create(min_alloc_order, -1);
|
|
if (!genpool) {
|
|
dev_err(dev, "fail to create genpool\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
|
|
ret = gen_pool_add_virt(genpool, vaddr, paddr, size, -1);
|
|
if (ret) {
|
|
dev_err(dev, "fail to add memory chunk to the pool\n");
|
|
gen_pool_destroy(genpool);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return genpool;
|
|
}
|
|
|
|
/**
|
|
* svc_smccc_smc() - secure monitor call between normal and secure world
|
|
* @a0: argument passed in registers 0
|
|
* @a1: argument passed in registers 1
|
|
* @a2: argument passed in registers 2
|
|
* @a3: argument passed in registers 3
|
|
* @a4: argument passed in registers 4
|
|
* @a5: argument passed in registers 5
|
|
* @a6: argument passed in registers 6
|
|
* @a7: argument passed in registers 7
|
|
* @res: result values from register 0 to 3
|
|
*/
|
|
static void svc_smccc_smc(unsigned long a0, unsigned long a1,
|
|
unsigned long a2, unsigned long a3,
|
|
unsigned long a4, unsigned long a5,
|
|
unsigned long a6, unsigned long a7,
|
|
struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
|
|
}
|
|
|
|
/**
|
|
* svc_smccc_hvc() - hypervisor call between normal and secure world
|
|
* @a0: argument passed in registers 0
|
|
* @a1: argument passed in registers 1
|
|
* @a2: argument passed in registers 2
|
|
* @a3: argument passed in registers 3
|
|
* @a4: argument passed in registers 4
|
|
* @a5: argument passed in registers 5
|
|
* @a6: argument passed in registers 6
|
|
* @a7: argument passed in registers 7
|
|
* @res: result values from register 0 to 3
|
|
*/
|
|
static void svc_smccc_hvc(unsigned long a0, unsigned long a1,
|
|
unsigned long a2, unsigned long a3,
|
|
unsigned long a4, unsigned long a5,
|
|
unsigned long a6, unsigned long a7,
|
|
struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
|
|
}
|
|
|
|
/**
|
|
* get_invoke_func() - invoke SMC or HVC call
|
|
* @dev: pointer to device
|
|
*
|
|
* Return: function pointer to svc_smccc_smc or svc_smccc_hvc.
|
|
*/
|
|
static svc_invoke_fn *get_invoke_func(struct device *dev)
|
|
{
|
|
const char *method;
|
|
|
|
if (of_property_read_string(dev->of_node, "method", &method)) {
|
|
dev_warn(dev, "missing \"method\" property\n");
|
|
return ERR_PTR(-ENXIO);
|
|
}
|
|
|
|
if (!strcmp(method, "smc"))
|
|
return svc_smccc_smc;
|
|
if (!strcmp(method, "hvc"))
|
|
return svc_smccc_hvc;
|
|
|
|
dev_warn(dev, "invalid \"method\" property: %s\n", method);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
/**
|
|
* stratix10_svc_request_channel_byname() - request a service channel
|
|
* @client: pointer to service client
|
|
* @name: service client name
|
|
*
|
|
* This function is used by service client to request a service channel.
|
|
*
|
|
* Return: a pointer to channel assigned to the client on success,
|
|
* or ERR_PTR() on error.
|
|
*/
|
|
struct stratix10_svc_chan *stratix10_svc_request_channel_byname(
|
|
struct stratix10_svc_client *client, const char *name)
|
|
{
|
|
struct device *dev = client->dev;
|
|
struct stratix10_svc_controller *controller;
|
|
struct stratix10_svc_chan *chan = NULL;
|
|
unsigned long flag;
|
|
int i;
|
|
|
|
/* if probe was called after client's, or error on probe */
|
|
if (list_empty(&svc_ctrl))
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
|
|
controller = list_first_entry(&svc_ctrl,
|
|
struct stratix10_svc_controller, node);
|
|
for (i = 0; i < SVC_NUM_CHANNEL; i++) {
|
|
if (!strcmp(controller->chans[i].name, name)) {
|
|
chan = &controller->chans[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if there was no channel match */
|
|
if (i == SVC_NUM_CHANNEL) {
|
|
dev_err(dev, "%s: channel not allocated\n", __func__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (chan->scl || !try_module_get(controller->dev->driver->owner)) {
|
|
dev_dbg(dev, "%s: svc not free\n", __func__);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
spin_lock_irqsave(&chan->lock, flag);
|
|
chan->scl = client;
|
|
chan->ctrl->num_active_client++;
|
|
spin_unlock_irqrestore(&chan->lock, flag);
|
|
|
|
return chan;
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_request_channel_byname);
|
|
|
|
/**
|
|
* stratix10_svc_free_channel() - free service channel
|
|
* @chan: service channel to be freed
|
|
*
|
|
* This function is used by service client to free a service channel.
|
|
*/
|
|
void stratix10_svc_free_channel(struct stratix10_svc_chan *chan)
|
|
{
|
|
unsigned long flag;
|
|
|
|
spin_lock_irqsave(&chan->lock, flag);
|
|
chan->scl = NULL;
|
|
chan->ctrl->num_active_client--;
|
|
module_put(chan->ctrl->dev->driver->owner);
|
|
spin_unlock_irqrestore(&chan->lock, flag);
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_free_channel);
|
|
|
|
/**
|
|
* stratix10_svc_send() - send a message data to the remote
|
|
* @chan: service channel assigned to the client
|
|
* @msg: message data to be sent, in the format of
|
|
* "struct stratix10_svc_client_msg"
|
|
*
|
|
* This function is used by service client to add a message to the service
|
|
* layer driver's queue for being sent to the secure world.
|
|
*
|
|
* Return: 0 for success, -ENOMEM or -ENOBUFS on error.
|
|
*/
|
|
int stratix10_svc_send(struct stratix10_svc_chan *chan, void *msg)
|
|
{
|
|
struct stratix10_svc_client_msg
|
|
*p_msg = (struct stratix10_svc_client_msg *)msg;
|
|
struct stratix10_svc_data_mem *p_mem;
|
|
struct stratix10_svc_data *p_data;
|
|
int ret = 0;
|
|
unsigned int cpu = 0;
|
|
|
|
p_data = kzalloc(sizeof(*p_data), GFP_KERNEL);
|
|
if (!p_data)
|
|
return -ENOMEM;
|
|
|
|
/* first client will create kernel thread */
|
|
if (!chan->ctrl->task) {
|
|
chan->ctrl->task =
|
|
kthread_create_on_node(svc_normal_to_secure_thread,
|
|
(void *)chan->ctrl,
|
|
cpu_to_node(cpu),
|
|
"svc_smc_hvc_thread");
|
|
if (IS_ERR(chan->ctrl->task)) {
|
|
dev_err(chan->ctrl->dev,
|
|
"failed to create svc_smc_hvc_thread\n");
|
|
kfree(p_data);
|
|
return -EINVAL;
|
|
}
|
|
kthread_bind(chan->ctrl->task, cpu);
|
|
wake_up_process(chan->ctrl->task);
|
|
}
|
|
|
|
pr_debug("%s: sent P-va=%p, P-com=%x, P-size=%u\n", __func__,
|
|
p_msg->payload, p_msg->command,
|
|
(unsigned int)p_msg->payload_length);
|
|
|
|
if (list_empty(&svc_data_mem)) {
|
|
if (p_msg->command == COMMAND_RECONFIG) {
|
|
struct stratix10_svc_command_config_type *ct =
|
|
(struct stratix10_svc_command_config_type *)
|
|
p_msg->payload;
|
|
p_data->flag = ct->flags;
|
|
}
|
|
} else {
|
|
list_for_each_entry(p_mem, &svc_data_mem, node)
|
|
if (p_mem->vaddr == p_msg->payload) {
|
|
p_data->paddr = p_mem->paddr;
|
|
break;
|
|
}
|
|
}
|
|
|
|
p_data->command = p_msg->command;
|
|
p_data->arg[0] = p_msg->arg[0];
|
|
p_data->arg[1] = p_msg->arg[1];
|
|
p_data->arg[2] = p_msg->arg[2];
|
|
p_data->size = p_msg->payload_length;
|
|
p_data->chan = chan;
|
|
pr_debug("%s: put to FIFO pa=0x%016x, cmd=%x, size=%u\n", __func__,
|
|
(unsigned int)p_data->paddr, p_data->command,
|
|
(unsigned int)p_data->size);
|
|
ret = kfifo_in_spinlocked(&chan->ctrl->svc_fifo, p_data,
|
|
sizeof(*p_data),
|
|
&chan->ctrl->svc_fifo_lock);
|
|
|
|
kfree(p_data);
|
|
|
|
if (!ret)
|
|
return -ENOBUFS;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_send);
|
|
|
|
/**
|
|
* stratix10_svc_done() - complete service request transactions
|
|
* @chan: service channel assigned to the client
|
|
*
|
|
* This function should be called when client has finished its request
|
|
* or there is an error in the request process. It allows the service layer
|
|
* to stop the running thread to have maximize savings in kernel resources.
|
|
*/
|
|
void stratix10_svc_done(struct stratix10_svc_chan *chan)
|
|
{
|
|
/* stop thread when thread is running AND only one active client */
|
|
if (chan->ctrl->task && chan->ctrl->num_active_client <= 1) {
|
|
pr_debug("svc_smc_hvc_shm_thread is stopped\n");
|
|
kthread_stop(chan->ctrl->task);
|
|
chan->ctrl->task = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_done);
|
|
|
|
/**
|
|
* stratix10_svc_allocate_memory() - allocate memory
|
|
* @chan: service channel assigned to the client
|
|
* @size: memory size requested by a specific service client
|
|
*
|
|
* Service layer allocates the requested number of bytes buffer from the
|
|
* memory pool, service client uses this function to get allocated buffers.
|
|
*
|
|
* Return: address of allocated memory on success, or ERR_PTR() on error.
|
|
*/
|
|
void *stratix10_svc_allocate_memory(struct stratix10_svc_chan *chan,
|
|
size_t size)
|
|
{
|
|
struct stratix10_svc_data_mem *pmem;
|
|
unsigned long va;
|
|
phys_addr_t pa;
|
|
struct gen_pool *genpool = chan->ctrl->genpool;
|
|
size_t s = roundup(size, 1 << genpool->min_alloc_order);
|
|
|
|
pmem = devm_kzalloc(chan->ctrl->dev, sizeof(*pmem), GFP_KERNEL);
|
|
if (!pmem)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
va = gen_pool_alloc(genpool, s);
|
|
if (!va)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memset((void *)va, 0, s);
|
|
pa = gen_pool_virt_to_phys(genpool, va);
|
|
|
|
pmem->vaddr = (void *)va;
|
|
pmem->paddr = pa;
|
|
pmem->size = s;
|
|
list_add_tail(&pmem->node, &svc_data_mem);
|
|
pr_debug("%s: va=%p, pa=0x%016x\n", __func__,
|
|
pmem->vaddr, (unsigned int)pmem->paddr);
|
|
|
|
return (void *)va;
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_allocate_memory);
|
|
|
|
/**
|
|
* stratix10_svc_free_memory() - free allocated memory
|
|
* @chan: service channel assigned to the client
|
|
* @kaddr: memory to be freed
|
|
*
|
|
* This function is used by service client to free allocated buffers.
|
|
*/
|
|
void stratix10_svc_free_memory(struct stratix10_svc_chan *chan, void *kaddr)
|
|
{
|
|
struct stratix10_svc_data_mem *pmem;
|
|
size_t size = 0;
|
|
|
|
list_for_each_entry(pmem, &svc_data_mem, node)
|
|
if (pmem->vaddr == kaddr) {
|
|
size = pmem->size;
|
|
break;
|
|
}
|
|
|
|
gen_pool_free(chan->ctrl->genpool, (unsigned long)kaddr, size);
|
|
pmem->vaddr = NULL;
|
|
list_del(&pmem->node);
|
|
}
|
|
EXPORT_SYMBOL_GPL(stratix10_svc_free_memory);
|
|
|
|
static const struct of_device_id stratix10_svc_drv_match[] = {
|
|
{.compatible = "intel,stratix10-svc"},
|
|
{.compatible = "intel,agilex-svc"},
|
|
{},
|
|
};
|
|
|
|
static int stratix10_svc_drv_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct stratix10_svc_controller *controller;
|
|
struct stratix10_svc_chan *chans;
|
|
struct gen_pool *genpool;
|
|
struct stratix10_svc_sh_memory *sh_memory;
|
|
struct stratix10_svc *svc;
|
|
|
|
svc_invoke_fn *invoke_fn;
|
|
size_t fifo_size;
|
|
int ret;
|
|
|
|
/* get SMC or HVC function */
|
|
invoke_fn = get_invoke_func(dev);
|
|
if (IS_ERR(invoke_fn))
|
|
return -EINVAL;
|
|
|
|
sh_memory = devm_kzalloc(dev, sizeof(*sh_memory), GFP_KERNEL);
|
|
if (!sh_memory)
|
|
return -ENOMEM;
|
|
|
|
sh_memory->invoke_fn = invoke_fn;
|
|
ret = svc_get_sh_memory(pdev, sh_memory);
|
|
if (ret)
|
|
return ret;
|
|
|
|
genpool = svc_create_memory_pool(pdev, sh_memory);
|
|
if (!genpool)
|
|
return -ENOMEM;
|
|
|
|
/* allocate service controller and supporting channel */
|
|
controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL);
|
|
if (!controller)
|
|
return -ENOMEM;
|
|
|
|
chans = devm_kmalloc_array(dev, SVC_NUM_CHANNEL,
|
|
sizeof(*chans), GFP_KERNEL | __GFP_ZERO);
|
|
if (!chans)
|
|
return -ENOMEM;
|
|
|
|
controller->dev = dev;
|
|
controller->num_chans = SVC_NUM_CHANNEL;
|
|
controller->num_active_client = 0;
|
|
controller->chans = chans;
|
|
controller->genpool = genpool;
|
|
controller->task = NULL;
|
|
controller->invoke_fn = invoke_fn;
|
|
init_completion(&controller->complete_status);
|
|
|
|
fifo_size = sizeof(struct stratix10_svc_data) * SVC_NUM_DATA_IN_FIFO;
|
|
ret = kfifo_alloc(&controller->svc_fifo, fifo_size, GFP_KERNEL);
|
|
if (ret) {
|
|
dev_err(dev, "failed to allocate FIFO\n");
|
|
return ret;
|
|
}
|
|
spin_lock_init(&controller->svc_fifo_lock);
|
|
|
|
chans[0].scl = NULL;
|
|
chans[0].ctrl = controller;
|
|
chans[0].name = SVC_CLIENT_FPGA;
|
|
spin_lock_init(&chans[0].lock);
|
|
|
|
chans[1].scl = NULL;
|
|
chans[1].ctrl = controller;
|
|
chans[1].name = SVC_CLIENT_RSU;
|
|
spin_lock_init(&chans[1].lock);
|
|
|
|
list_add_tail(&controller->node, &svc_ctrl);
|
|
platform_set_drvdata(pdev, controller);
|
|
|
|
/* add svc client device(s) */
|
|
svc = devm_kzalloc(dev, sizeof(*svc), GFP_KERNEL);
|
|
if (!svc) {
|
|
ret = -ENOMEM;
|
|
goto err_free_kfifo;
|
|
}
|
|
|
|
svc->stratix10_svc_rsu = platform_device_alloc(STRATIX10_RSU, 0);
|
|
if (!svc->stratix10_svc_rsu) {
|
|
dev_err(dev, "failed to allocate %s device\n", STRATIX10_RSU);
|
|
ret = -ENOMEM;
|
|
goto err_free_kfifo;
|
|
}
|
|
|
|
ret = platform_device_add(svc->stratix10_svc_rsu);
|
|
if (ret)
|
|
goto err_put_device;
|
|
|
|
dev_set_drvdata(dev, svc);
|
|
|
|
pr_info("Intel Service Layer Driver Initialized\n");
|
|
|
|
return 0;
|
|
|
|
err_put_device:
|
|
platform_device_put(svc->stratix10_svc_rsu);
|
|
err_free_kfifo:
|
|
kfifo_free(&controller->svc_fifo);
|
|
return ret;
|
|
}
|
|
|
|
static int stratix10_svc_drv_remove(struct platform_device *pdev)
|
|
{
|
|
struct stratix10_svc *svc = dev_get_drvdata(&pdev->dev);
|
|
struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev);
|
|
|
|
platform_device_unregister(svc->stratix10_svc_rsu);
|
|
|
|
kfifo_free(&ctrl->svc_fifo);
|
|
if (ctrl->task) {
|
|
kthread_stop(ctrl->task);
|
|
ctrl->task = NULL;
|
|
}
|
|
if (ctrl->genpool)
|
|
gen_pool_destroy(ctrl->genpool);
|
|
list_del(&ctrl->node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver stratix10_svc_driver = {
|
|
.probe = stratix10_svc_drv_probe,
|
|
.remove = stratix10_svc_drv_remove,
|
|
.driver = {
|
|
.name = "stratix10-svc",
|
|
.of_match_table = stratix10_svc_drv_match,
|
|
},
|
|
};
|
|
|
|
static int __init stratix10_svc_init(void)
|
|
{
|
|
struct device_node *fw_np;
|
|
struct device_node *np;
|
|
int ret;
|
|
|
|
fw_np = of_find_node_by_name(NULL, "firmware");
|
|
if (!fw_np)
|
|
return -ENODEV;
|
|
|
|
np = of_find_matching_node(fw_np, stratix10_svc_drv_match);
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
of_node_put(np);
|
|
ret = of_platform_populate(fw_np, stratix10_svc_drv_match, NULL, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return platform_driver_register(&stratix10_svc_driver);
|
|
}
|
|
|
|
static void __exit stratix10_svc_exit(void)
|
|
{
|
|
return platform_driver_unregister(&stratix10_svc_driver);
|
|
}
|
|
|
|
subsys_initcall(stratix10_svc_init);
|
|
module_exit(stratix10_svc_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Intel Stratix10 Service Layer Driver");
|
|
MODULE_AUTHOR("Richard Gong <richard.gong@intel.com>");
|
|
MODULE_ALIAS("platform:stratix10-svc");
|