--- /dev/null
+/*
+ * 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 <linux/pci_regs.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 ssize_t reset_adapter_store(struct device *device,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cxl *adapter = to_cxl_adapter(device);
+ int rc;
+ int val;
+
+ rc = sscanf(buf, "%i", &val);
+ if ((rc != 1) || (val != 1))
+ return -EINVAL;
+
+ if ((rc = cxl_reset(adapter)))
+ return rc;
+ return count;
+}
+
+static ssize_t load_image_on_perst_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cxl *adapter = to_cxl_adapter(device);
+
+ if (!adapter->perst_loads_image)
+ return scnprintf(buf, PAGE_SIZE, "none\n");
+
+ if (adapter->perst_select_user)
+ return scnprintf(buf, PAGE_SIZE, "user\n");
+ return scnprintf(buf, PAGE_SIZE, "factory\n");
+}
+
+static ssize_t load_image_on_perst_store(struct device *device,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cxl *adapter = to_cxl_adapter(device);
+ int rc;
+
+ if (!strncmp(buf, "none", 4))
+ adapter->perst_loads_image = false;
+ else if (!strncmp(buf, "user", 4)) {
+ adapter->perst_select_user = true;
+ adapter->perst_loads_image = true;
+ } else if (!strncmp(buf, "factory", 7)) {
+ adapter->perst_select_user = false;
+ adapter->perst_loads_image = true;
+ } else
+ return -EINVAL;
+
+ if ((rc = cxl_update_image_control(adapter)))
+ return rc;
+
+ return count;
+}
+
+static struct device_attribute adapter_attrs[] = {
+ __ATTR_RO(caia_version),
+ __ATTR_RO(psl_revision),
+ __ATTR_RO(base_image),
+ __ATTR_RO(image_loaded),
+ __ATTR_RW(load_image_on_perst),
+ __ATTR(reset, S_IWUSR, NULL, reset_adapter_store),
+};
+
+
+/********* 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]);
+}
+
+struct afu_config_record {
+ struct kobject kobj;
+ struct bin_attribute config_attr;
+ struct list_head list;
+ int cr;
+ u16 device;
+ u16 vendor;
+ u32 class;
+};
+
+#define to_cr(obj) container_of(obj, struct afu_config_record, kobj)
+
+static ssize_t vendor_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->vendor);
+}
+
+static ssize_t device_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.4x\n", cr->device);
+}
+
+static ssize_t class_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ return scnprintf(buf, PAGE_SIZE, "0x%.6x\n", cr->class);
+}
+
+static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+ struct cxl_afu *afu = to_cxl_afu(container_of(kobj->parent, struct device, kobj));
+
+ u64 i, j, val, size = afu->crs_len;
+
+ if (off > size)
+ return 0;
+ if (off + count > size)
+ count = size - off;
+
+ for (i = 0; i < count;) {
+ val = cxl_afu_cr_read64(afu, cr->cr, off & ~0x7);
+ for (j = off & 0x7; j < 8 && i < count; i++, j++, off++)
+ buf[i] = (val >> (j * 8)) & 0xff;
+ }
+
+ return count;
+}
+
+static struct kobj_attribute vendor_attribute =
+ __ATTR_RO(vendor);
+static struct kobj_attribute device_attribute =
+ __ATTR_RO(device);
+static struct kobj_attribute class_attribute =
+ __ATTR_RO(class);
+
+static struct attribute *afu_cr_attrs[] = {
+ &vendor_attribute.attr,
+ &device_attribute.attr,
+ &class_attribute.attr,
+ NULL,
+};
+
+static void release_afu_config_record(struct kobject *kobj)
+{
+ struct afu_config_record *cr = to_cr(kobj);
+
+ kfree(cr);
+}
+
+static struct kobj_type afu_config_record_type = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .release = release_afu_config_record,
+ .default_attrs = afu_cr_attrs,
+};
+
+static struct afu_config_record *cxl_sysfs_afu_new_cr(struct cxl_afu *afu, int cr_idx)
+{
+ struct afu_config_record *cr;
+ int rc;
+
+ cr = kzalloc(sizeof(struct afu_config_record), GFP_KERNEL);
+ if (!cr)
+ return ERR_PTR(-ENOMEM);
+
+ cr->cr = cr_idx;
+ cr->device = cxl_afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID);
+ cr->vendor = cxl_afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID);
+ cr->class = cxl_afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION) >> 8;
+
+ /*
+ * Export raw AFU PCIe like config record. For now this is read only by
+ * root - we can expand that later to be readable by non-root and maybe
+ * even writable provided we have a good use-case. Once we suport
+ * exposing AFUs through a virtual PHB they will get that for free from
+ * 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;
+
+ 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;
+ }
+
+ 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:
+ 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]);
+}
Code Review / kvmfornfv.git / blobdiff