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/*
* Copyright 2014 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include "cxl.h"
#define to_afu_chardev_m(d) dev_get_drvdata(d)
/********* Adapter attributes **********************************************/
static ssize_t caia_version_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl *adapter = to_cxl_adapter(device);
return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
adapter->caia_minor);
}
static ssize_t psl_revision_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl *adapter = to_cxl_adapter(device);
return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
}
static ssize_t base_image_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl *adapter = to_cxl_adapter(device);
return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
}
static ssize_t image_loaded_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl *adapter = to_cxl_adapter(device);
if (adapter->user_image_loaded)
return scnprintf(buf, PAGE_SIZE, "user\n");
return scnprintf(buf, PAGE_SIZE, "factory\n");
}
static struct device_attribute adapter_attrs[] = {
__ATTR_RO(caia_version),
__ATTR_RO(psl_revision),
__ATTR_RO(base_image),
__ATTR_RO(image_loaded),
};
/********* AFU master specific attributes **********************************/
static ssize_t mmio_size_show_master(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_afu_chardev_m(device);
return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
}
static ssize_t pp_mmio_off_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_afu_chardev_m(device);
return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_offset);
}
static ssize_t pp_mmio_len_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_afu_chardev_m(device);
return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
}
static struct device_attribute afu_master_attrs[] = {
__ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
__ATTR_RO(pp_mmio_off),
__ATTR_RO(pp_mmio_len),
};
/********* AFU attributes **************************************************/
static ssize_t mmio_size_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
if (afu->pp_size)
return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
}
static ssize_t reset_store_afu(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cxl_afu *afu = to_cxl_afu(device);
int rc;
/* Not safe to reset if it is currently in use */
mutex_lock(&afu->contexts_lock);
if (!idr_is_empty(&afu->contexts_idr)) {
rc = -EBUSY;
goto err;
}
if ((rc = cxl_afu_reset(afu)))
goto err;
rc = count;
err:
mutex_unlock(&afu->contexts_lock);
return rc;
}
static ssize_t irqs_min_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
}
static ssize_t irqs_max_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
}
static ssize_t irqs_max_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cxl_afu *afu = to_cxl_afu(device);
ssize_t ret;
int irqs_max;
ret = sscanf(buf, "%i", &irqs_max);
if (ret != 1)
return -EINVAL;
if (irqs_max < afu->pp_irqs)
return -EINVAL;
if (irqs_max > afu->adapter->user_irqs)
return -EINVAL;
afu->irqs_max = irqs_max;
return count;
}
static ssize_t modes_supported_show(struct device *device,
struct device_attribute *attr, char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
char *p = buf, *end = buf + PAGE_SIZE;
if (afu->modes_supported & CXL_MODE_DEDICATED)
p += scnprintf(p, end - p, "dedicated_process\n");
if (afu->modes_supported & CXL_MODE_DIRECTED)
p += scnprintf(p, end - p, "afu_directed\n");
return (p - buf);
}
static ssize_t prefault_mode_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
switch (afu->prefault_mode) {
case CXL_PREFAULT_WED:
return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
case CXL_PREFAULT_ALL:
return scnprintf(buf, PAGE_SIZE, "all\n");
default:
return scnprintf(buf, PAGE_SIZE, "none\n");
}
}
static ssize_t prefault_mode_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cxl_afu *afu = to_cxl_afu(device);
enum prefault_modes mode = -1;
if (!strncmp(buf, "work_element_descriptor", 23))
mode = CXL_PREFAULT_WED;
if (!strncmp(buf, "all", 3))
mode = CXL_PREFAULT_ALL;
if (!strncmp(buf, "none", 4))
mode = CXL_PREFAULT_NONE;
if (mode == -1)
return -EINVAL;
afu->prefault_mode = mode;
return count;
}
static ssize_t mode_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
struct cxl_afu *afu = to_cxl_afu(device);
if (afu->current_mode == CXL_MODE_DEDICATED)
return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
if (afu->current_mode == CXL_MODE_DIRECTED)
return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
return scnprintf(buf, PAGE_SIZE, "none\n");
}
static ssize_t mode_store(struct device *device, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cxl_afu *afu = to_cxl_afu(device);
int old_mode, mode = -1;
int rc = -EBUSY;
/* can't change this if we have a user */
mutex_lock(&afu->contexts_lock);
if (!idr_is_empty(&afu->contexts_idr))
goto err;
if (!strncmp(buf, "dedicated_process", 17))
mode = CXL_MODE_DEDICATED;
if (!strncmp(buf, "afu_directed", 12))
mode = CXL_MODE_DIRECTED;
if (!strncmp(buf, "none", 4))
mode = 0;
if (mode == -1) {
rc = -EINVAL;
goto err;
}
/*
* cxl_afu_deactivate_mode needs to be done outside the lock, prevent
* other contexts coming in before we are ready:
*/
old_mode = afu->current_mode;
afu->current_mode = 0;
afu->num_procs = 0;
mutex_unlock(&afu->contexts_lock);
if ((rc = _cxl_afu_deactivate_mode(afu, old_mode)))
return rc;
if ((rc = cxl_afu_activate_mode(afu, mode)))
return rc;
return count;
err:
mutex_unlock(&afu->contexts_lock);
return rc;
}
static ssize_t api_version_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
}
static ssize_t api_version_compatible_show(struct device *device,
struct device_attribute *attr,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
}
static struct device_attribute afu_attrs[] = {
__ATTR_RO(mmio_size),
__ATTR_RO(irqs_min),
__ATTR_RW(irqs_max),
__ATTR_RO(modes_supported),
__ATTR_RW(mode),
__ATTR_RW(prefault_mode),
__ATTR_RO(api_version),
__ATTR_RO(api_version_compatible),
__ATTR(reset, S_IWUSR, NULL, reset_store_afu),
};
int cxl_sysfs_adapter_add(struct cxl *adapter)
{
int i, rc;
for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
goto err;
}
return 0;
err:
for (i--; i >= 0; i--)
device_remove_file(&adapter->dev, &adapter_attrs[i]);
return rc;
}
void cxl_sysfs_adapter_remove(struct cxl *adapter)
{
int i;
for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
device_remove_file(&adapter->dev, &adapter_attrs[i]);
}
int cxl_sysfs_afu_add(struct cxl_afu *afu)
{
int i, rc;
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
goto err;
}
return 0;
err:
for (i--; i >= 0; i--)
device_remove_file(&afu->dev, &afu_attrs[i]);
return rc;
}
void cxl_sysfs_afu_remove(struct cxl_afu *afu)
{
int i;
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
device_remove_file(&afu->dev, &afu_attrs[i]);
}
int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
{
int i, rc;
for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
goto err;
}
return 0;
err:
for (i--; i >= 0; i--)
device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
return rc;
}
void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
{
int i;
for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++)
device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
}
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