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linux/drivers/firmware/stratix10-svc.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017-2018, Intel Corporation
*/
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/genalloc.h>
#include <linux/io.h>
#include <linux/kfifo.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/firmware/intel/stratix10-smc.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/types.h>
/**
* SVC_NUM_DATA_IN_FIFO - number of struct stratix10_svc_data in the FIFO
*
* SVC_NUM_CHANNEL - number of channel supported by service layer driver
*
* FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS - claim back the submitted buffer(s)
* from the secure world for FPGA manager to reuse, or to free the buffer(s)
* when all bit-stream data had be send.
*
* FPGA_CONFIG_STATUS_TIMEOUT_SEC - poll the FPGA configuration status,
* service layer will return error to FPGA manager when timeout occurs,
* timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC.
*/
#define SVC_NUM_DATA_IN_FIFO 32
#define SVC_NUM_CHANNEL 2
#define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS 200
#define FPGA_CONFIG_STATUS_TIMEOUT_SEC 30
/* stratix10 service layer clients */
#define STRATIX10_RSU "stratix10-rsu"
typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long,
struct arm_smccc_res *);
struct stratix10_svc_chan;
/**
* struct stratix10_svc - svc private data
* @stratix10_svc_rsu: pointer to stratix10 RSU device
*/
struct stratix10_svc {
struct platform_device *stratix10_svc_rsu;
};
/**
* struct stratix10_svc_sh_memory - service shared memory structure
* @sync_complete: state for a completion
* @addr: physical address of shared memory block
* @size: size of shared memory block
* @invoke_fn: function to issue secure monitor or hypervisor call
*
* This struct is used to save physical address and size of shared memory
* block. The shared memory blocked is allocated by secure monitor software
* at secure world.
*
* Service layer driver uses the physical address and size to create a memory
* pool, then allocates data buffer from that memory pool for service client.
*/
struct stratix10_svc_sh_memory {
struct completion sync_complete;
unsigned long addr;
unsigned long size;
svc_invoke_fn *invoke_fn;
};
/**
* struct stratix10_svc_data_mem - service memory structure
* @vaddr: virtual address
* @paddr: physical address
* @size: size of memory
* @node: link list head node
*
* This struct is used in a list that keeps track of buffers which have
* been allocated or freed from the memory pool. Service layer driver also
* uses this struct to transfer physical address to virtual address.
*/
struct stratix10_svc_data_mem {
void *vaddr;
phys_addr_t paddr;
size_t size;
struct list_head node;
};
/**
* struct stratix10_svc_data - service data structure
* @chan: service channel
* @paddr: playload physical address
* @size: playload size
* @command: service command requested by client
* @flag: configuration type (full or partial)
* @arg: args to be passed via registers and not physically mapped buffers
*
* This struct is used in service FIFO for inter-process communication.
*/
struct stratix10_svc_data {
struct stratix10_svc_chan *chan;
phys_addr_t paddr;
size_t size;
u32 command;
u32 flag;
u64 arg[3];
};
/**
* struct stratix10_svc_controller - service controller
* @dev: device
* @chans: array of service channels
* @num_chans: number of channels in 'chans' array
* @num_active_client: number of active service client
* @node: list management
* @genpool: memory pool pointing to the memory region
* @task: pointer to the thread task which handles SMC or HVC call
* @svc_fifo: a queue for storing service message data
* @complete_status: state for completion
* @svc_fifo_lock: protect access to service message data queue
* @invoke_fn: function to issue secure monitor call or hypervisor call
*
* This struct is used to create communication channels for service clients, to
* handle secure monitor or hypervisor call.
*/
struct stratix10_svc_controller {
struct device *dev;
struct stratix10_svc_chan *chans;
int num_chans;
int num_active_client;
struct list_head node;
struct gen_pool *genpool;
struct task_struct *task;
struct kfifo svc_fifo;
struct completion complete_status;
spinlock_t svc_fifo_lock;
svc_invoke_fn *invoke_fn;
};
/**
* struct stratix10_svc_chan - service communication channel
* @ctrl: pointer to service controller which is the provider of this channel
* @scl: pointer to service client which owns the channel
* @name: service client name associated with the channel
* @lock: protect access to the channel
*
* This struct is used by service client to communicate with service layer, each
* service client has its own channel created by service controller.
*/
struct stratix10_svc_chan {
struct stratix10_svc_controller *ctrl;
struct stratix10_svc_client *scl;
char *name;
spinlock_t lock;
};
static LIST_HEAD(svc_ctrl);
static LIST_HEAD(svc_data_mem);
/**
* svc_pa_to_va() - translate physical address to virtual address
* @addr: to be translated physical address
*
* Return: valid virtual address or NULL if the provided physical
* address doesn't exist.
*/
static void *svc_pa_to_va(unsigned long addr)
{
struct stratix10_svc_data_mem *pmem;
pr_debug("claim back P-addr=0x%016x\n", (unsigned int)addr);
list_for_each_entry(pmem, &svc_data_mem, node)
if (pmem->paddr == addr)
return pmem->vaddr;
/* physical address is not found */
return NULL;
}
/**
* svc_thread_cmd_data_claim() - claim back buffer from the secure world
* @ctrl: pointer to service layer controller
* @p_data: pointer to service data structure
* @cb_data: pointer to callback data structure to service client
*
* Claim back the submitted buffers from the secure world and pass buffer
* back to service client (FPGA manager, etc) for reuse.
*/
static void svc_thread_cmd_data_claim(struct stratix10_svc_controller *ctrl,
struct stratix10_svc_data *p_data,
struct stratix10_svc_cb_data *cb_data)
{
struct arm_smccc_res res;
unsigned long timeout;
reinit_completion(&ctrl->complete_status);
timeout = msecs_to_jiffies(FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS);
pr_debug("%s: claim back the submitted buffer\n", __func__);
do {
ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE,
0, 0, 0, 0, 0, 0, 0, &res);
if (res.a0 == INTEL_SIP_SMC_STATUS_OK) {
if (!res.a1) {
complete(&ctrl->complete_status);
break;
}
cb_data->status = BIT(SVC_STATUS_BUFFER_DONE);
cb_data->kaddr1 = svc_pa_to_va(res.a1);
cb_data->kaddr2 = (res.a2) ?
svc_pa_to_va(res.a2) : NULL;
cb_data->kaddr3 = (res.a3) ?
svc_pa_to_va(res.a3) : NULL;
p_data->chan->scl->receive_cb(p_data->chan->scl,
cb_data);
} else {
pr_debug("%s: secure world busy, polling again\n",
__func__);
}
} while (res.a0 == INTEL_SIP_SMC_STATUS_OK ||
res.a0 == INTEL_SIP_SMC_STATUS_BUSY ||
wait_for_completion_timeout(&ctrl->complete_status, timeout));
}
/**
* svc_thread_cmd_config_status() - check configuration status
* @ctrl: pointer to service layer controller
* @p_data: pointer to service data structure
* @cb_data: pointer to callback data structure to service client
*
* Check whether the secure firmware at secure world has finished the FPGA
* configuration, and then inform FPGA manager the configuration status.
*/
static void svc_thread_cmd_config_status(struct stratix10_svc_controller *ctrl,
struct stratix10_svc_data *p_data,
struct stratix10_svc_cb_data *cb_data)
{
struct arm_smccc_res res;
int count_in_sec;
cb_data->kaddr1 = NULL;
cb_data->kaddr2 = NULL;
cb_data->kaddr3 = NULL;
cb_data->status = BIT(SVC_STATUS_ERROR);
pr_debug("%s: polling config status\n", __func__);
count_in_sec = FPGA_CONFIG_STATUS_TIMEOUT_SEC;
while (count_in_sec) {
ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE,
0, 0, 0, 0, 0, 0, 0, &res);
if ((res.a0 == INTEL_SIP_SMC_STATUS_OK) ||
(res.a0 == INTEL_SIP_SMC_STATUS_ERROR))
break;
/*
* configuration is still in progress, wait one second then
* poll again
*/
msleep(1000);
count_in_sec--;
}
if (res.a0 == INTEL_SIP_SMC_STATUS_OK && count_in_sec)
cb_data->status = BIT(SVC_STATUS_COMPLETED);
p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
}
/**
* svc_thread_recv_status_ok() - handle the successful status
* @p_data: pointer to service data structure
* @cb_data: pointer to callback data structure to service client
* @res: result from SMC or HVC call
*
* Send back the correspond status to the service clients.
*/
static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
struct stratix10_svc_cb_data *cb_data,
struct arm_smccc_res res)
{
cb_data->kaddr1 = NULL;
cb_data->kaddr2 = NULL;
cb_data->kaddr3 = NULL;
switch (p_data->command) {
case COMMAND_RECONFIG:
case COMMAND_RSU_UPDATE:
case COMMAND_RSU_NOTIFY:
cb_data->status = BIT(SVC_STATUS_OK);
break;
case COMMAND_RECONFIG_DATA_SUBMIT:
cb_data->status = BIT(SVC_STATUS_BUFFER_SUBMITTED);
break;
case COMMAND_RECONFIG_STATUS:
cb_data->status = BIT(SVC_STATUS_COMPLETED);
break;
case COMMAND_RSU_RETRY:
cb_data->status = BIT(SVC_STATUS_OK);
cb_data->kaddr1 = &res.a1;
break;
default:
pr_warn("it shouldn't happen\n");
break;
}
pr_debug("%s: call receive_cb\n", __func__);
p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data);
}
/**
* svc_normal_to_secure_thread() - the function to run in the kthread
* @data: data pointer for kthread function
*
* Service layer driver creates stratix10_svc_smc_hvc_call kthread on CPU
* node 0, its function stratix10_svc_secure_call_thread is used to handle
* SMC or HVC calls between kernel driver and secure monitor software.
*
* Return: 0 for success or -ENOMEM on error.
*/
static int svc_normal_to_secure_thread(void *data)
{
struct stratix10_svc_controller
*ctrl = (struct stratix10_svc_controller *)data;
struct stratix10_svc_data *pdata;
struct stratix10_svc_cb_data *cbdata;
struct arm_smccc_res res;
unsigned long a0, a1, a2;
int ret_fifo = 0;
pdata = kmalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
cbdata = kmalloc(sizeof(*cbdata), GFP_KERNEL);
if (!cbdata) {
kfree(pdata);
return -ENOMEM;
}
/* default set, to remove build warning */
a0 = INTEL_SIP_SMC_FPGA_CONFIG_LOOPBACK;
a1 = 0;
a2 = 0;
pr_debug("smc_hvc_shm_thread is running\n");
while (!kthread_should_stop()) {
ret_fifo = kfifo_out_spinlocked(&ctrl->svc_fifo,
pdata, sizeof(*pdata),
&ctrl->svc_fifo_lock);
if (!ret_fifo)
continue;
pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n",
(unsigned int)pdata->paddr, pdata->command,
(unsigned int)pdata->size);
switch (pdata->command) {
case COMMAND_RECONFIG_DATA_CLAIM:
svc_thread_cmd_data_claim(ctrl, pdata, cbdata);
continue;
case COMMAND_RECONFIG:
a0 = INTEL_SIP_SMC_FPGA_CONFIG_START;
pr_debug("conf_type=%u\n", (unsigned int)pdata->flag);
a1 = pdata->flag;
a2 = 0;
break;
case COMMAND_RECONFIG_DATA_SUBMIT:
a0 = INTEL_SIP_SMC_FPGA_CONFIG_WRITE;
a1 = (unsigned long)pdata->paddr;
a2 = (unsigned long)pdata->size;
break;
case COMMAND_RECONFIG_STATUS:
a0 = INTEL_SIP_SMC_FPGA_CONFIG_ISDONE;
a1 = 0;
a2 = 0;
break;
case COMMAND_RSU_STATUS:
a0 = INTEL_SIP_SMC_RSU_STATUS;
a1 = 0;
a2 = 0;
break;
case COMMAND_RSU_UPDATE:
a0 = INTEL_SIP_SMC_RSU_UPDATE;
a1 = pdata->arg[0];
a2 = 0;
break;
case COMMAND_RSU_NOTIFY:
a0 = INTEL_SIP_SMC_RSU_NOTIFY;
a1 = pdata->arg[0];
a2 = 0;
break;
case COMMAND_RSU_RETRY:
a0 = INTEL_SIP_SMC_RSU_RETRY_COUNTER;
a1 = 0;
a2 = 0;
break;
default:
pr_warn("it shouldn't happen\n");
break;
}
pr_debug("%s: before SMC call -- a0=0x%016x a1=0x%016x",
__func__, (unsigned int)a0, (unsigned int)a1);
pr_debug(" a2=0x%016x\n", (unsigned int)a2);
ctrl->invoke_fn(a0, a1, a2, 0, 0, 0, 0, 0, &res);
pr_debug("%s: after SMC call -- res.a0=0x%016x",
__func__, (unsigned int)res.a0);
pr_debug(" res.a1=0x%016x, res.a2=0x%016x",
(unsigned int)res.a1, (unsigned int)res.a2);
pr_debug(" res.a3=0x%016x\n", (unsigned int)res.a3);
if (pdata->command == COMMAND_RSU_STATUS) {
if (res.a0 == INTEL_SIP_SMC_RSU_ERROR)
cbdata->status = BIT(SVC_STATUS_ERROR);
else
cbdata->status = BIT(SVC_STATUS_OK);
cbdata->kaddr1 = &res;
cbdata->kaddr2 = NULL;
cbdata->kaddr3 = NULL;
pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata);
continue;
}
switch (res.a0) {
case INTEL_SIP_SMC_STATUS_OK:
svc_thread_recv_status_ok(pdata, cbdata, res);
break;
case INTEL_SIP_SMC_STATUS_BUSY:
switch (pdata->command) {
case COMMAND_RECONFIG_DATA_SUBMIT:
svc_thread_cmd_data_claim(ctrl,
pdata, cbdata);
break;
case COMMAND_RECONFIG_STATUS:
svc_thread_cmd_config_status(ctrl,
pdata, cbdata);
break;
default:
pr_warn("it shouldn't happen\n");
break;
}
break;
case INTEL_SIP_SMC_STATUS_REJECTED:
pr_debug("%s: STATUS_REJECTED\n", __func__);
break;
case INTEL_SIP_SMC_STATUS_ERROR:
case INTEL_SIP_SMC_RSU_ERROR:
pr_err("%s: STATUS_ERROR\n", __func__);
cbdata->status = BIT(SVC_STATUS_ERROR);
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_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)
return -ENOMEM;
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);
return -ENOMEM;
}
ret = platform_device_add(svc->stratix10_svc_rsu);
if (ret) {
platform_device_put(svc->stratix10_svc_rsu);
return ret;
}
dev_set_drvdata(dev, svc);
pr_info("Intel Service Layer Driver Initialized\n");
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");
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