X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmisc%2Fcxl%2Fsysfs.c;fp=kernel%2Fdrivers%2Fmisc%2Fcxl%2Fsysfs.c;h=d0c38c7bc0c4bfb552f568f59f4f4371809b3b1f;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/misc/cxl/sysfs.c b/kernel/drivers/misc/cxl/sysfs.c new file mode 100644 index 000000000..d0c38c7bc --- /dev/null +++ b/kernel/drivers/misc/cxl/sysfs.c @@ -0,0 +1,601 @@ +/* + * 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 +#include +#include +#include + +#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]); +}