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linux-next/drivers/fpga/stratix10-soc.c
Richard Gong 7fbc2bc2fb fpga: stratix10-soc: make FPGA task un-interruptible
When CTRL+C occurs during the process of FPGA reconfiguration, the FPGA
reconfiguration process stops and the user can't perform a new FPGA
reconfiguration properly.

Set FPGA task to be not interruptible so that the user can properly
perform FPGA reconfiguration after CTRL+C event.

Signed-off-by: Richard Gong <richard.gong@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
2020-08-19 21:05:46 -07:00

516 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* FPGA Manager Driver for Intel Stratix10 SoC
*
* Copyright (C) 2018 Intel Corporation
*/
#include <linux/completion.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
/*
* FPGA programming requires a higher level of privilege (EL3), per the SoC
* design.
*/
#define NUM_SVC_BUFS 4
#define SVC_BUF_SIZE SZ_512K
/* Indicates buffer is in use if set */
#define SVC_BUF_LOCK 0
#define S10_BUFFER_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_BUFFER_TIMEOUT_MS))
#define S10_RECONFIG_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_REQUEST_TIMEOUT_MS))
/*
* struct s10_svc_buf
* buf: virtual address of buf provided by service layer
* lock: locked if buffer is in use
*/
struct s10_svc_buf {
char *buf;
unsigned long lock;
};
struct s10_priv {
struct stratix10_svc_chan *chan;
struct stratix10_svc_client client;
struct completion status_return_completion;
struct s10_svc_buf svc_bufs[NUM_SVC_BUFS];
unsigned long status;
};
static int s10_svc_send_msg(struct s10_priv *priv,
enum stratix10_svc_command_code command,
void *payload, u32 payload_length)
{
struct stratix10_svc_chan *chan = priv->chan;
struct device *dev = priv->client.dev;
struct stratix10_svc_client_msg msg;
int ret;
dev_dbg(dev, "%s cmd=%d payload=%p length=%d\n",
__func__, command, payload, payload_length);
msg.command = command;
msg.payload = payload;
msg.payload_length = payload_length;
ret = stratix10_svc_send(chan, &msg);
dev_dbg(dev, "stratix10_svc_send returned status %d\n", ret);
return ret;
}
/*
* Free buffers allocated from the service layer's pool that are not in use.
* Return true when all buffers are freed.
*/
static bool s10_free_buffers(struct fpga_manager *mgr)
{
struct s10_priv *priv = mgr->priv;
uint num_free = 0;
uint i;
for (i = 0; i < NUM_SVC_BUFS; i++) {
if (!priv->svc_bufs[i].buf) {
num_free++;
continue;
}
if (!test_and_set_bit_lock(SVC_BUF_LOCK,
&priv->svc_bufs[i].lock)) {
stratix10_svc_free_memory(priv->chan,
priv->svc_bufs[i].buf);
priv->svc_bufs[i].buf = NULL;
num_free++;
}
}
return num_free == NUM_SVC_BUFS;
}
/*
* Returns count of how many buffers are not in use.
*/
static uint s10_free_buffer_count(struct fpga_manager *mgr)
{
struct s10_priv *priv = mgr->priv;
uint num_free = 0;
uint i;
for (i = 0; i < NUM_SVC_BUFS; i++)
if (!priv->svc_bufs[i].buf)
num_free++;
return num_free;
}
/*
* s10_unlock_bufs
* Given the returned buffer address, match that address to our buffer struct
* and unlock that buffer. This marks it as available to be refilled and sent
* (or freed).
* priv: private data
* kaddr: kernel address of buffer that was returned from service layer
*/
static void s10_unlock_bufs(struct s10_priv *priv, void *kaddr)
{
uint i;
if (!kaddr)
return;
for (i = 0; i < NUM_SVC_BUFS; i++)
if (priv->svc_bufs[i].buf == kaddr) {
clear_bit_unlock(SVC_BUF_LOCK,
&priv->svc_bufs[i].lock);
return;
}
WARN(1, "Unknown buffer returned from service layer %p\n", kaddr);
}
/*
* s10_receive_callback - callback for service layer to use to provide client
* (this driver) messages received through the mailbox.
* client: service layer client struct
* data: message from service layer
*/
static void s10_receive_callback(struct stratix10_svc_client *client,
struct stratix10_svc_cb_data *data)
{
struct s10_priv *priv = client->priv;
u32 status;
int i;
WARN_ONCE(!data, "%s: stratix10_svc_rc_data = NULL", __func__);
status = data->status;
/*
* Here we set status bits as we receive them. Elsewhere, we always use
* test_and_clear_bit() to check status in priv->status
*/
for (i = 0; i <= SVC_STATUS_ERROR; i++)
if (status & (1 << i))
set_bit(i, &priv->status);
if (status & BIT(SVC_STATUS_BUFFER_DONE)) {
s10_unlock_bufs(priv, data->kaddr1);
s10_unlock_bufs(priv, data->kaddr2);
s10_unlock_bufs(priv, data->kaddr3);
}
complete(&priv->status_return_completion);
}
/*
* s10_ops_write_init - prepare for FPGA reconfiguration by requesting
* partial reconfig and allocating buffers from the service layer.
*/
static int s10_ops_write_init(struct fpga_manager *mgr,
struct fpga_image_info *info,
const char *buf, size_t count)
{
struct s10_priv *priv = mgr->priv;
struct device *dev = priv->client.dev;
struct stratix10_svc_command_config_type ctype;
char *kbuf;
uint i;
int ret;
ctype.flags = 0;
if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
dev_dbg(dev, "Requesting partial reconfiguration.\n");
ctype.flags |= BIT(COMMAND_RECONFIG_FLAG_PARTIAL);
} else {
dev_dbg(dev, "Requesting full reconfiguration.\n");
}
reinit_completion(&priv->status_return_completion);
ret = s10_svc_send_msg(priv, COMMAND_RECONFIG,
&ctype, sizeof(ctype));
if (ret < 0)
goto init_done;
ret = wait_for_completion_timeout(
&priv->status_return_completion, S10_RECONFIG_TIMEOUT);
if (!ret) {
dev_err(dev, "timeout waiting for RECONFIG_REQUEST\n");
ret = -ETIMEDOUT;
goto init_done;
}
ret = 0;
if (!test_and_clear_bit(SVC_STATUS_OK, &priv->status)) {
ret = -ETIMEDOUT;
goto init_done;
}
/* Allocate buffers from the service layer's pool. */
for (i = 0; i < NUM_SVC_BUFS; i++) {
kbuf = stratix10_svc_allocate_memory(priv->chan, SVC_BUF_SIZE);
if (!kbuf) {
s10_free_buffers(mgr);
ret = -ENOMEM;
goto init_done;
}
priv->svc_bufs[i].buf = kbuf;
priv->svc_bufs[i].lock = 0;
}
init_done:
stratix10_svc_done(priv->chan);
return ret;
}
/*
* s10_send_buf - send a buffer to the service layer queue
* mgr: fpga manager struct
* buf: fpga image buffer
* count: size of buf in bytes
* Returns # of bytes transferred or -ENOBUFS if the all the buffers are in use
* or if the service queue is full. Never returns 0.
*/
static int s10_send_buf(struct fpga_manager *mgr, const char *buf, size_t count)
{
struct s10_priv *priv = mgr->priv;
struct device *dev = priv->client.dev;
void *svc_buf;
size_t xfer_sz;
int ret;
uint i;
/* get/lock a buffer that that's not being used */
for (i = 0; i < NUM_SVC_BUFS; i++)
if (!test_and_set_bit_lock(SVC_BUF_LOCK,
&priv->svc_bufs[i].lock))
break;
if (i == NUM_SVC_BUFS)
return -ENOBUFS;
xfer_sz = count < SVC_BUF_SIZE ? count : SVC_BUF_SIZE;
svc_buf = priv->svc_bufs[i].buf;
memcpy(svc_buf, buf, xfer_sz);
ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_DATA_SUBMIT,
svc_buf, xfer_sz);
if (ret < 0) {
dev_err(dev,
"Error while sending data to service layer (%d)", ret);
clear_bit_unlock(SVC_BUF_LOCK, &priv->svc_bufs[i].lock);
return ret;
}
return xfer_sz;
}
/*
* Send a FPGA image to privileged layers to write to the FPGA. When done
* sending, free all service layer buffers we allocated in write_init.
*/
static int s10_ops_write(struct fpga_manager *mgr, const char *buf,
size_t count)
{
struct s10_priv *priv = mgr->priv;
struct device *dev = priv->client.dev;
long wait_status;
int sent = 0;
int ret = 0;
/*
* Loop waiting for buffers to be returned. When a buffer is returned,
* reuse it to send more data or free if if all data has been sent.
*/
while (count > 0 || s10_free_buffer_count(mgr) != NUM_SVC_BUFS) {
reinit_completion(&priv->status_return_completion);
if (count > 0) {
sent = s10_send_buf(mgr, buf, count);
if (sent < 0)
continue;
count -= sent;
buf += sent;
} else {
if (s10_free_buffers(mgr))
return 0;
ret = s10_svc_send_msg(
priv, COMMAND_RECONFIG_DATA_CLAIM,
NULL, 0);
if (ret < 0)
break;
}
/*
* If callback hasn't already happened, wait for buffers to be
* returned from service layer
*/
wait_status = 1; /* not timed out */
if (!priv->status)
wait_status = wait_for_completion_timeout(
&priv->status_return_completion,
S10_BUFFER_TIMEOUT);
if (test_and_clear_bit(SVC_STATUS_BUFFER_DONE, &priv->status) ||
test_and_clear_bit(SVC_STATUS_BUFFER_SUBMITTED,
&priv->status)) {
ret = 0;
continue;
}
if (test_and_clear_bit(SVC_STATUS_ERROR, &priv->status)) {
dev_err(dev, "ERROR - giving up - SVC_STATUS_ERROR\n");
ret = -EFAULT;
break;
}
if (!wait_status) {
dev_err(dev, "timeout waiting for svc layer buffers\n");
ret = -ETIMEDOUT;
break;
}
}
if (!s10_free_buffers(mgr))
dev_err(dev, "%s not all buffers were freed\n", __func__);
return ret;
}
static int s10_ops_write_complete(struct fpga_manager *mgr,
struct fpga_image_info *info)
{
struct s10_priv *priv = mgr->priv;
struct device *dev = priv->client.dev;
unsigned long timeout;
int ret;
timeout = usecs_to_jiffies(info->config_complete_timeout_us);
do {
reinit_completion(&priv->status_return_completion);
ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_STATUS, NULL, 0);
if (ret < 0)
break;
ret = wait_for_completion_timeout(
&priv->status_return_completion, timeout);
if (!ret) {
dev_err(dev,
"timeout waiting for RECONFIG_COMPLETED\n");
ret = -ETIMEDOUT;
break;
}
/* Not error or timeout, so ret is # of jiffies until timeout */
timeout = ret;
ret = 0;
if (test_and_clear_bit(SVC_STATUS_COMPLETED, &priv->status))
break;
if (test_and_clear_bit(SVC_STATUS_ERROR, &priv->status)) {
dev_err(dev, "ERROR - giving up - SVC_STATUS_ERROR\n");
ret = -EFAULT;
break;
}
} while (1);
stratix10_svc_done(priv->chan);
return ret;
}
static enum fpga_mgr_states s10_ops_state(struct fpga_manager *mgr)
{
return FPGA_MGR_STATE_UNKNOWN;
}
static const struct fpga_manager_ops s10_ops = {
.state = s10_ops_state,
.write_init = s10_ops_write_init,
.write = s10_ops_write,
.write_complete = s10_ops_write_complete,
};
static int s10_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct s10_priv *priv;
struct fpga_manager *mgr;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->client.dev = dev;
priv->client.receive_cb = s10_receive_callback;
priv->client.priv = priv;
priv->chan = stratix10_svc_request_channel_byname(&priv->client,
SVC_CLIENT_FPGA);
if (IS_ERR(priv->chan)) {
dev_err(dev, "couldn't get service channel (%s)\n",
SVC_CLIENT_FPGA);
return PTR_ERR(priv->chan);
}
init_completion(&priv->status_return_completion);
mgr = fpga_mgr_create(dev, "Stratix10 SOC FPGA Manager",
&s10_ops, priv);
if (!mgr) {
dev_err(dev, "unable to create FPGA manager\n");
ret = -ENOMEM;
goto probe_err;
}
ret = fpga_mgr_register(mgr);
if (ret) {
dev_err(dev, "unable to register FPGA manager\n");
fpga_mgr_free(mgr);
goto probe_err;
}
platform_set_drvdata(pdev, mgr);
return ret;
probe_err:
stratix10_svc_free_channel(priv->chan);
return ret;
}
static int s10_remove(struct platform_device *pdev)
{
struct fpga_manager *mgr = platform_get_drvdata(pdev);
struct s10_priv *priv = mgr->priv;
fpga_mgr_unregister(mgr);
stratix10_svc_free_channel(priv->chan);
return 0;
}
static const struct of_device_id s10_of_match[] = {
{.compatible = "intel,stratix10-soc-fpga-mgr"},
{.compatible = "intel,agilex-soc-fpga-mgr"},
{},
};
MODULE_DEVICE_TABLE(of, s10_of_match);
static struct platform_driver s10_driver = {
.probe = s10_probe,
.remove = s10_remove,
.driver = {
.name = "Stratix10 SoC FPGA manager",
.of_match_table = of_match_ptr(s10_of_match),
},
};
static int __init s10_init(void)
{
struct device_node *fw_np;
struct device_node *np;
int ret;
fw_np = of_find_node_by_name(NULL, "svc");
if (!fw_np)
return -ENODEV;
of_node_get(fw_np);
np = of_find_matching_node(fw_np, s10_of_match);
if (!np) {
of_node_put(fw_np);
return -ENODEV;
}
of_node_put(np);
ret = of_platform_populate(fw_np, s10_of_match, NULL, NULL);
of_node_put(fw_np);
if (ret)
return ret;
return platform_driver_register(&s10_driver);
}
static void __exit s10_exit(void)
{
return platform_driver_unregister(&s10_driver);
}
module_init(s10_init);
module_exit(s10_exit);
MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
MODULE_DESCRIPTION("Intel Stratix 10 SOC FPGA Manager");
MODULE_LICENSE("GPL v2");