mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
9a8d3cda8d
Port enable is not complete until ACK = 0. Change __afu_port_enable() to guarantee that the enable process is complete by polling for ACK == 0. Signed-off-by: Russ Weight <russell.h.weight@intel.com> Reviewed-by: Tom Rix <trix@redhat.com> Reviewed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Acked-by: Wu Hao <hao.wu@intel.com> Signed-off-by: Moritz Fischer <mdf@kernel.org>
250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Driver for FPGA Accelerated Function Unit (AFU) Error Reporting
|
|
*
|
|
* Copyright 2019 Intel Corporation, Inc.
|
|
*
|
|
* Authors:
|
|
* Wu Hao <hao.wu@linux.intel.com>
|
|
* Xiao Guangrong <guangrong.xiao@linux.intel.com>
|
|
* Joseph Grecco <joe.grecco@intel.com>
|
|
* Enno Luebbers <enno.luebbers@intel.com>
|
|
* Tim Whisonant <tim.whisonant@intel.com>
|
|
* Ananda Ravuri <ananda.ravuri@intel.com>
|
|
* Mitchel Henry <henry.mitchel@intel.com>
|
|
*/
|
|
|
|
#include <linux/fpga-dfl.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "dfl-afu.h"
|
|
|
|
#define PORT_ERROR_MASK 0x8
|
|
#define PORT_ERROR 0x10
|
|
#define PORT_FIRST_ERROR 0x18
|
|
#define PORT_MALFORMED_REQ0 0x20
|
|
#define PORT_MALFORMED_REQ1 0x28
|
|
|
|
#define ERROR_MASK GENMASK_ULL(63, 0)
|
|
|
|
/* mask or unmask port errors by the error mask register. */
|
|
static void __afu_port_err_mask(struct device *dev, bool mask)
|
|
{
|
|
void __iomem *base;
|
|
|
|
base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
|
|
|
|
writeq(mask ? ERROR_MASK : 0, base + PORT_ERROR_MASK);
|
|
}
|
|
|
|
static void afu_port_err_mask(struct device *dev, bool mask)
|
|
{
|
|
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
|
|
|
|
mutex_lock(&pdata->lock);
|
|
__afu_port_err_mask(dev, mask);
|
|
mutex_unlock(&pdata->lock);
|
|
}
|
|
|
|
/* clear port errors. */
|
|
static int afu_port_err_clear(struct device *dev, u64 err)
|
|
{
|
|
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
void __iomem *base_err, *base_hdr;
|
|
int enable_ret = 0, ret = -EBUSY;
|
|
u64 v;
|
|
|
|
base_err = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
|
|
base_hdr = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER);
|
|
|
|
mutex_lock(&pdata->lock);
|
|
|
|
/*
|
|
* clear Port Errors
|
|
*
|
|
* - Check for AP6 State
|
|
* - Halt Port by keeping Port in reset
|
|
* - Set PORT Error mask to all 1 to mask errors
|
|
* - Clear all errors
|
|
* - Set Port mask to all 0 to enable errors
|
|
* - All errors start capturing new errors
|
|
* - Enable Port by pulling the port out of reset
|
|
*/
|
|
|
|
/* if device is still in AP6 power state, can not clear any error. */
|
|
v = readq(base_hdr + PORT_HDR_STS);
|
|
if (FIELD_GET(PORT_STS_PWR_STATE, v) == PORT_STS_PWR_STATE_AP6) {
|
|
dev_err(dev, "Could not clear errors, device in AP6 state.\n");
|
|
goto done;
|
|
}
|
|
|
|
/* Halt Port by keeping Port in reset */
|
|
ret = __afu_port_disable(pdev);
|
|
if (ret)
|
|
goto done;
|
|
|
|
/* Mask all errors */
|
|
__afu_port_err_mask(dev, true);
|
|
|
|
/* Clear errors if err input matches with current port errors.*/
|
|
v = readq(base_err + PORT_ERROR);
|
|
|
|
if (v == err) {
|
|
writeq(v, base_err + PORT_ERROR);
|
|
|
|
v = readq(base_err + PORT_FIRST_ERROR);
|
|
writeq(v, base_err + PORT_FIRST_ERROR);
|
|
} else {
|
|
dev_warn(dev, "%s: received 0x%llx, expected 0x%llx\n",
|
|
__func__, v, err);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Clear mask */
|
|
__afu_port_err_mask(dev, false);
|
|
|
|
/* Enable the Port by clearing the reset */
|
|
enable_ret = __afu_port_enable(pdev);
|
|
|
|
done:
|
|
mutex_unlock(&pdata->lock);
|
|
return enable_ret ? enable_ret : ret;
|
|
}
|
|
|
|
static ssize_t errors_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
|
|
void __iomem *base;
|
|
u64 error;
|
|
|
|
base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
|
|
|
|
mutex_lock(&pdata->lock);
|
|
error = readq(base + PORT_ERROR);
|
|
mutex_unlock(&pdata->lock);
|
|
|
|
return sprintf(buf, "0x%llx\n", (unsigned long long)error);
|
|
}
|
|
|
|
static ssize_t errors_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buff, size_t count)
|
|
{
|
|
u64 value;
|
|
int ret;
|
|
|
|
if (kstrtou64(buff, 0, &value))
|
|
return -EINVAL;
|
|
|
|
ret = afu_port_err_clear(dev, value);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
static DEVICE_ATTR_RW(errors);
|
|
|
|
static ssize_t first_error_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
|
|
void __iomem *base;
|
|
u64 error;
|
|
|
|
base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
|
|
|
|
mutex_lock(&pdata->lock);
|
|
error = readq(base + PORT_FIRST_ERROR);
|
|
mutex_unlock(&pdata->lock);
|
|
|
|
return sprintf(buf, "0x%llx\n", (unsigned long long)error);
|
|
}
|
|
static DEVICE_ATTR_RO(first_error);
|
|
|
|
static ssize_t first_malformed_req_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
|
|
void __iomem *base;
|
|
u64 req0, req1;
|
|
|
|
base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
|
|
|
|
mutex_lock(&pdata->lock);
|
|
req0 = readq(base + PORT_MALFORMED_REQ0);
|
|
req1 = readq(base + PORT_MALFORMED_REQ1);
|
|
mutex_unlock(&pdata->lock);
|
|
|
|
return sprintf(buf, "0x%016llx%016llx\n",
|
|
(unsigned long long)req1, (unsigned long long)req0);
|
|
}
|
|
static DEVICE_ATTR_RO(first_malformed_req);
|
|
|
|
static struct attribute *port_err_attrs[] = {
|
|
&dev_attr_errors.attr,
|
|
&dev_attr_first_error.attr,
|
|
&dev_attr_first_malformed_req.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t port_err_attrs_visible(struct kobject *kobj,
|
|
struct attribute *attr, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
|
|
/*
|
|
* sysfs entries are visible only if related private feature is
|
|
* enumerated.
|
|
*/
|
|
if (!dfl_get_feature_by_id(dev, PORT_FEATURE_ID_ERROR))
|
|
return 0;
|
|
|
|
return attr->mode;
|
|
}
|
|
|
|
const struct attribute_group port_err_group = {
|
|
.name = "errors",
|
|
.attrs = port_err_attrs,
|
|
.is_visible = port_err_attrs_visible,
|
|
};
|
|
|
|
static int port_err_init(struct platform_device *pdev,
|
|
struct dfl_feature *feature)
|
|
{
|
|
afu_port_err_mask(&pdev->dev, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void port_err_uinit(struct platform_device *pdev,
|
|
struct dfl_feature *feature)
|
|
{
|
|
afu_port_err_mask(&pdev->dev, true);
|
|
}
|
|
|
|
static long
|
|
port_err_ioctl(struct platform_device *pdev, struct dfl_feature *feature,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case DFL_FPGA_PORT_ERR_GET_IRQ_NUM:
|
|
return dfl_feature_ioctl_get_num_irqs(pdev, feature, arg);
|
|
case DFL_FPGA_PORT_ERR_SET_IRQ:
|
|
return dfl_feature_ioctl_set_irq(pdev, feature, arg);
|
|
default:
|
|
dev_dbg(&pdev->dev, "%x cmd not handled", cmd);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
const struct dfl_feature_id port_err_id_table[] = {
|
|
{.id = PORT_FEATURE_ID_ERROR,},
|
|
{0,}
|
|
};
|
|
|
|
const struct dfl_feature_ops port_err_ops = {
|
|
.init = port_err_init,
|
|
.uinit = port_err_uinit,
|
|
.ioctl = port_err_ioctl,
|
|
};
|