![Michael Neuling](/assets/img/avatar_default.png)
Rename cxl_afu_reset() to __cxl_afu_reset() to we can reuse this function name in the API. Signed-off-by: Michael Neuling <mikey@neuling.org> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
635 lines
15 KiB
C
635 lines
15 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/pci_regs.h>
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#include "cxl.h"
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#define to_afu_chardev_m(d) dev_get_drvdata(d)
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/********* Adapter attributes **********************************************/
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static ssize_t caia_version_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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return scnprintf(buf, PAGE_SIZE, "%i.%i\n", adapter->caia_major,
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adapter->caia_minor);
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}
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static ssize_t psl_revision_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_rev);
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}
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static ssize_t base_image_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->base_image);
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}
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static ssize_t image_loaded_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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if (adapter->user_image_loaded)
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return scnprintf(buf, PAGE_SIZE, "user\n");
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return scnprintf(buf, PAGE_SIZE, "factory\n");
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}
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static ssize_t reset_adapter_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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int rc;
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int val;
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rc = sscanf(buf, "%i", &val);
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if ((rc != 1) || (val != 1))
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return -EINVAL;
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if ((rc = cxl_reset(adapter)))
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return rc;
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return count;
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}
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static ssize_t load_image_on_perst_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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if (!adapter->perst_loads_image)
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return scnprintf(buf, PAGE_SIZE, "none\n");
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if (adapter->perst_select_user)
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return scnprintf(buf, PAGE_SIZE, "user\n");
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return scnprintf(buf, PAGE_SIZE, "factory\n");
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}
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static ssize_t load_image_on_perst_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl *adapter = to_cxl_adapter(device);
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int rc;
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if (!strncmp(buf, "none", 4))
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adapter->perst_loads_image = false;
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else if (!strncmp(buf, "user", 4)) {
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adapter->perst_select_user = true;
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adapter->perst_loads_image = true;
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} else if (!strncmp(buf, "factory", 7)) {
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adapter->perst_select_user = false;
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adapter->perst_loads_image = true;
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} else
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return -EINVAL;
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if ((rc = cxl_update_image_control(adapter)))
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return rc;
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return count;
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}
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static struct device_attribute adapter_attrs[] = {
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__ATTR_RO(caia_version),
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__ATTR_RO(psl_revision),
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__ATTR_RO(base_image),
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__ATTR_RO(image_loaded),
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__ATTR_RW(load_image_on_perst),
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__ATTR(reset, S_IWUSR, NULL, reset_adapter_store),
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};
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/********* AFU master specific attributes **********************************/
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static ssize_t mmio_size_show_master(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_afu_chardev_m(device);
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return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
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}
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static ssize_t pp_mmio_off_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_afu_chardev_m(device);
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return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_offset);
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}
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static ssize_t pp_mmio_len_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_afu_chardev_m(device);
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return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
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}
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static struct device_attribute afu_master_attrs[] = {
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__ATTR(mmio_size, S_IRUGO, mmio_size_show_master, NULL),
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__ATTR_RO(pp_mmio_off),
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__ATTR_RO(pp_mmio_len),
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};
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/********* AFU attributes **************************************************/
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static ssize_t mmio_size_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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if (afu->pp_size)
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return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->pp_size);
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return scnprintf(buf, PAGE_SIZE, "%llu\n", afu->adapter->ps_size);
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}
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static ssize_t reset_store_afu(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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int rc;
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/* Not safe to reset if it is currently in use */
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mutex_lock(&afu->contexts_lock);
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if (!idr_is_empty(&afu->contexts_idr)) {
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rc = -EBUSY;
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goto err;
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}
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if ((rc = __cxl_afu_reset(afu)))
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goto err;
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rc = count;
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err:
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mutex_unlock(&afu->contexts_lock);
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return rc;
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}
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static ssize_t irqs_min_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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return scnprintf(buf, PAGE_SIZE, "%i\n", afu->pp_irqs);
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}
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static ssize_t irqs_max_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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return scnprintf(buf, PAGE_SIZE, "%i\n", afu->irqs_max);
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}
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static ssize_t irqs_max_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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ssize_t ret;
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int irqs_max;
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ret = sscanf(buf, "%i", &irqs_max);
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if (ret != 1)
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return -EINVAL;
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if (irqs_max < afu->pp_irqs)
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return -EINVAL;
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if (irqs_max > afu->adapter->user_irqs)
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return -EINVAL;
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afu->irqs_max = irqs_max;
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return count;
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}
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static ssize_t modes_supported_show(struct device *device,
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struct device_attribute *attr, char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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char *p = buf, *end = buf + PAGE_SIZE;
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if (afu->modes_supported & CXL_MODE_DEDICATED)
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p += scnprintf(p, end - p, "dedicated_process\n");
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if (afu->modes_supported & CXL_MODE_DIRECTED)
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p += scnprintf(p, end - p, "afu_directed\n");
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return (p - buf);
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}
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static ssize_t prefault_mode_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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switch (afu->prefault_mode) {
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case CXL_PREFAULT_WED:
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return scnprintf(buf, PAGE_SIZE, "work_element_descriptor\n");
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case CXL_PREFAULT_ALL:
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return scnprintf(buf, PAGE_SIZE, "all\n");
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default:
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return scnprintf(buf, PAGE_SIZE, "none\n");
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}
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}
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static ssize_t prefault_mode_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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enum prefault_modes mode = -1;
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if (!strncmp(buf, "work_element_descriptor", 23))
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mode = CXL_PREFAULT_WED;
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if (!strncmp(buf, "all", 3))
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mode = CXL_PREFAULT_ALL;
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if (!strncmp(buf, "none", 4))
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mode = CXL_PREFAULT_NONE;
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if (mode == -1)
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return -EINVAL;
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afu->prefault_mode = mode;
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return count;
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}
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static ssize_t mode_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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if (afu->current_mode == CXL_MODE_DEDICATED)
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return scnprintf(buf, PAGE_SIZE, "dedicated_process\n");
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if (afu->current_mode == CXL_MODE_DIRECTED)
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return scnprintf(buf, PAGE_SIZE, "afu_directed\n");
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return scnprintf(buf, PAGE_SIZE, "none\n");
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}
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static ssize_t mode_store(struct device *device, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cxl_afu *afu = to_cxl_afu(device);
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int old_mode, mode = -1;
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int rc = -EBUSY;
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/* can't change this if we have a user */
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mutex_lock(&afu->contexts_lock);
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if (!idr_is_empty(&afu->contexts_idr))
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goto err;
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if (!strncmp(buf, "dedicated_process", 17))
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mode = CXL_MODE_DEDICATED;
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if (!strncmp(buf, "afu_directed", 12))
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mode = CXL_MODE_DIRECTED;
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if (!strncmp(buf, "none", 4))
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mode = 0;
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if (mode == -1) {
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rc = -EINVAL;
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goto err;
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}
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/*
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* cxl_afu_deactivate_mode needs to be done outside the lock, prevent
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* other contexts coming in before we are ready:
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*/
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old_mode = afu->current_mode;
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afu->current_mode = 0;
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afu->num_procs = 0;
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mutex_unlock(&afu->contexts_lock);
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if ((rc = _cxl_afu_deactivate_mode(afu, old_mode)))
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return rc;
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if ((rc = cxl_afu_activate_mode(afu, mode)))
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return rc;
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return count;
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err:
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mutex_unlock(&afu->contexts_lock);
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return rc;
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}
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static ssize_t api_version_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION);
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}
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static ssize_t api_version_compatible_show(struct device *device,
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struct device_attribute *attr,
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char *buf)
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{
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return scnprintf(buf, PAGE_SIZE, "%i\n", CXL_API_VERSION_COMPATIBLE);
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}
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static ssize_t afu_eb_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
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{
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struct cxl_afu *afu = to_cxl_afu(container_of(kobj,
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struct device, kobj));
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return cxl_afu_read_err_buffer(afu, buf, off, count);
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}
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static struct device_attribute afu_attrs[] = {
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__ATTR_RO(mmio_size),
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__ATTR_RO(irqs_min),
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__ATTR_RW(irqs_max),
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__ATTR_RO(modes_supported),
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__ATTR_RW(mode),
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__ATTR_RW(prefault_mode),
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__ATTR_RO(api_version),
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__ATTR_RO(api_version_compatible),
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__ATTR(reset, S_IWUSR, NULL, reset_store_afu),
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};
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int cxl_sysfs_adapter_add(struct cxl *adapter)
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{
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int i, rc;
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for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
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if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
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goto err;
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}
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return 0;
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err:
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for (i--; i >= 0; i--)
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device_remove_file(&adapter->dev, &adapter_attrs[i]);
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return rc;
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}
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void cxl_sysfs_adapter_remove(struct cxl *adapter)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
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device_remove_file(&adapter->dev, &adapter_attrs[i]);
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}
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struct afu_config_record {
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struct kobject kobj;
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struct bin_attribute config_attr;
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struct list_head list;
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int cr;
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u16 device;
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u16 vendor;
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u32 class;
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};
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#define to_cr(obj) container_of(obj, struct afu_config_record, kobj)
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static ssize_t vendor_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct afu_config_record *cr = to_cr(kobj);
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return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->vendor);
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}
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static ssize_t device_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct afu_config_record *cr = to_cr(kobj);
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return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->device);
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}
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static ssize_t class_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct afu_config_record *cr = to_cr(kobj);
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return scnprintf(buf, PAGE_SIZE, "0x%.6x\n", cr->class);
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}
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static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *buf,
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loff_t off, size_t count)
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{
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struct afu_config_record *cr = to_cr(kobj);
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struct cxl_afu *afu = to_cxl_afu(container_of(kobj->parent, struct device, kobj));
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u64 i, j, val, size = afu->crs_len;
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if (off > size)
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return 0;
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if (off + count > size)
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count = size - off;
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for (i = 0; i < count;) {
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val = cxl_afu_cr_read64(afu, cr->cr, off & ~0x7);
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for (j = off & 0x7; j < 8 && i < count; i++, j++, off++)
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buf[i] = (val >> (j * 8)) & 0xff;
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}
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return count;
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}
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static struct kobj_attribute vendor_attribute =
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__ATTR_RO(vendor);
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static struct kobj_attribute device_attribute =
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__ATTR_RO(device);
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static struct kobj_attribute class_attribute =
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__ATTR_RO(class);
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static struct attribute *afu_cr_attrs[] = {
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&vendor_attribute.attr,
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&device_attribute.attr,
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&class_attribute.attr,
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NULL,
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};
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static void release_afu_config_record(struct kobject *kobj)
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{
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struct afu_config_record *cr = to_cr(kobj);
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kfree(cr);
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}
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static struct kobj_type afu_config_record_type = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = release_afu_config_record,
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.default_attrs = afu_cr_attrs,
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};
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static struct afu_config_record *cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int cr_idx)
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{
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struct afu_config_record *cr;
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int rc;
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cr = kzalloc(sizeof(struct afu_config_record), GFP_KERNEL);
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if (!cr)
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return ERR_PTR(-ENOMEM);
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cr->cr = cr_idx;
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cr->device = cxl_afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID);
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cr->vendor = cxl_afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID);
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cr->class = cxl_afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION) >> 8;
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/*
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* Export raw AFU PCIe like config record. For now this is read only by
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* root - we can expand that later to be readable by non-root and maybe
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* even writable provided we have a good use-case. Once we suport
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* exposing AFUs through a virtual PHB they will get that for free from
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* Linux' PCI infrastructure, but until then it's not clear that we
|
|
* need it for anything since the main use case is just identifying
|
|
* AFUs, which can be done via the vendor, device and class attributes.
|
|
*/
|
|
sysfs_bin_attr_init(&cr->config_attr);
|
|
cr->config_attr.attr.name = "config";
|
|
cr->config_attr.attr.mode = S_IRUSR;
|
|
cr->config_attr.size = afu->crs_len;
|
|
cr->config_attr.read = afu_read_config;
|
|
|
|
rc = kobject_init_and_add(&cr->kobj, &afu_config_record_type,
|
|
&afu->dev.kobj, "cr%i", cr->cr);
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = sysfs_create_bin_file(&cr->kobj, &cr->config_attr);
|
|
if (rc)
|
|
goto err1;
|
|
|
|
rc = kobject_uevent(&cr->kobj, KOBJ_ADD);
|
|
if (rc)
|
|
goto err2;
|
|
|
|
return cr;
|
|
err2:
|
|
sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
|
|
err1:
|
|
kobject_put(&cr->kobj);
|
|
return ERR_PTR(rc);
|
|
err:
|
|
kfree(cr);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
void cxl_sysfs_afu_remove(struct cxl_afu *afu)
|
|
{
|
|
struct afu_config_record *cr, *tmp;
|
|
int i;
|
|
|
|
/* remove the err buffer bin attribute */
|
|
if (afu->eb_len)
|
|
device_remove_bin_file(&afu->dev, &afu->attr_eb);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
|
|
device_remove_file(&afu->dev, &afu_attrs[i]);
|
|
|
|
list_for_each_entry_safe(cr, tmp, &afu->crs, list) {
|
|
sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
|
|
kobject_put(&cr->kobj);
|
|
}
|
|
}
|
|
|
|
int cxl_sysfs_afu_add(struct cxl_afu *afu)
|
|
{
|
|
struct afu_config_record *cr;
|
|
int i, rc;
|
|
|
|
INIT_LIST_HEAD(&afu->crs);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
|
|
if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
|
|
goto err;
|
|
}
|
|
|
|
/* conditionally create the add the binary file for error info buffer */
|
|
if (afu->eb_len) {
|
|
afu->attr_eb.attr.name = "afu_err_buff";
|
|
afu->attr_eb.attr.mode = S_IRUGO;
|
|
afu->attr_eb.size = afu->eb_len;
|
|
afu->attr_eb.read = afu_eb_read;
|
|
|
|
rc = device_create_bin_file(&afu->dev, &afu->attr_eb);
|
|
if (rc) {
|
|
dev_err(&afu->dev,
|
|
"Unable to create eb attr for the afu. Err(%d)\n",
|
|
rc);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < afu->crs_num; i++) {
|
|
cr = cxl_sysfs_afu_new_cr(afu, i);
|
|
if (IS_ERR(cr)) {
|
|
rc = PTR_ERR(cr);
|
|
goto err1;
|
|
}
|
|
list_add(&cr->list, &afu->crs);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
cxl_sysfs_afu_remove(afu);
|
|
return rc;
|
|
err:
|
|
/* reset the eb_len as we havent created the bin attr */
|
|
afu->eb_len = 0;
|
|
|
|
for (i--; i >= 0; i--)
|
|
device_remove_file(&afu->dev, &afu_attrs[i]);
|
|
return rc;
|
|
}
|
|
|
|
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]);
|
|
}
|