From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/misc/cxl/sysfs.c | 771 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 771 insertions(+) create mode 100644 drivers/misc/cxl/sysfs.c (limited to 'drivers/misc/cxl/sysfs.c') diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c new file mode 100644 index 000000000..315c43f17 --- /dev/null +++ b/drivers/misc/cxl/sysfs.c @@ -0,0 +1,771 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2014 IBM Corp. + */ + +#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 psl_timebase_synced_show(struct device *device, + struct device_attribute *attr, + char *buf) +{ + struct cxl *adapter = to_cxl_adapter(device); + u64 psl_tb, delta; + + /* Recompute the status only in native mode */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + psl_tb = adapter->native->sl_ops->timebase_read(adapter); + delta = abs(mftb() - psl_tb); + + /* CORE TB and PSL TB difference <= 16usecs ? */ + adapter->psl_timebase_synced = (tb_to_ns(delta) < 16000) ? true : false; + pr_devel("PSL timebase %s - delta: 0x%016llx\n", + (tb_to_ns(delta) < 16000) ? "synchronized" : + "not synchronized", tb_to_ns(delta)); + } + return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_timebase_synced); +} + +static ssize_t tunneled_ops_supported_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->tunneled_ops_supported); +} + +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 && val != -1)) + return -EINVAL; + + /* + * See if we can lock the context mapping that's only allowed + * when there are no contexts attached to the adapter. Once + * taken this will also prevent any context from getting activated. + */ + if (val == 1) { + rc = cxl_adapter_context_lock(adapter); + if (rc) + goto out; + + rc = cxl_ops->adapter_reset(adapter); + /* In case reset failed release context lock */ + if (rc) + cxl_adapter_context_unlock(adapter); + + } else if (val == -1) { + /* Perform a forced adapter reset */ + rc = cxl_ops->adapter_reset(adapter); + } + +out: + return rc ? rc : 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 ssize_t perst_reloads_same_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->perst_same_image); +} + +static ssize_t perst_reloads_same_image_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 || val == 0)) + return -EINVAL; + + adapter->perst_same_image = (val == 1); + 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_RO(psl_timebase_synced), + __ATTR_RO(tunneled_ops_supported), + __ATTR_RW(load_image_on_perst), + __ATTR_RW(perst_reloads_same_image), + __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->native->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_ops->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 (cpu_has_feature(CPU_FTR_HVMODE)) { + if (irqs_max > afu->adapter->user_irqs) + return -EINVAL; + } else { + /* pHyp sets a per-AFU limit */ + if (irqs_max > afu->guest->max_ints) + 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, "none", 4)) + mode = CXL_PREFAULT_NONE; + else { + if (!radix_enabled()) { + + /* only allowed when not in radix mode */ + if (!strncmp(buf, "work_element_descriptor", 23)) + mode = CXL_PREFAULT_WED; + if (!strncmp(buf, "all", 3)) + mode = CXL_PREFAULT_ALL; + } else { + dev_err(device, "Cannot prefault with radix enabled\n"); + } + } + + 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; + } + + /* + * 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_ops->afu_deactivate_mode(afu, old_mode))) + return rc; + if ((rc = cxl_ops->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 ssize_t afu_eb_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct cxl_afu *afu = to_cxl_afu(kobj_to_dev(kobj)); + + return cxl_ops->afu_read_err_buffer(afu, buf, off, count); +} + +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) +{ + struct device_attribute *dev_attr; + int i, rc; + + for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) { + dev_attr = &adapter_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_ADAPTER_ATTRS)) { + if ((rc = device_create_file(&adapter->dev, dev_attr))) + goto err; + } + } + return 0; +err: + for (i--; i >= 0; i--) { + dev_attr = &adapter_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_ADAPTER_ATTRS)) + device_remove_file(&adapter->dev, dev_attr); + } + return rc; +} + +void cxl_sysfs_adapter_remove(struct cxl *adapter) +{ + struct device_attribute *dev_attr; + int i; + + for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) { + dev_attr = &adapter_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_ADAPTER_ATTRS)) + device_remove_file(&adapter->dev, dev_attr); + } +} + +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(kobj_to_dev(kobj->parent)); + + u64 i, j, val, rc; + + for (i = 0; i < count;) { + rc = cxl_ops->afu_cr_read64(afu, cr->cr, off & ~0x7, &val); + if (rc) + val = ~0ULL; + 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, +}; +ATTRIBUTE_GROUPS(afu_cr); + +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_groups = afu_cr_groups, +}; + +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; + + rc = cxl_ops->afu_cr_read16(afu, cr_idx, PCI_DEVICE_ID, &cr->device); + if (rc) + goto err; + rc = cxl_ops->afu_cr_read16(afu, cr_idx, PCI_VENDOR_ID, &cr->vendor); + if (rc) + goto err; + rc = cxl_ops->afu_cr_read32(afu, cr_idx, PCI_CLASS_REVISION, &cr->class); + if (rc) + goto err; + cr->class >>= 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 support + * 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 err1; + + 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 device_attribute *dev_attr; + 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++) { + dev_attr = &afu_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_ATTRS)) + 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 device_attribute *dev_attr; + struct afu_config_record *cr; + int i, rc; + + INIT_LIST_HEAD(&afu->crs); + + for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) { + dev_attr = &afu_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_ATTRS)) { + 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) { + sysfs_attr_init(&afu->attr_eb.attr); + + 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--) { + dev_attr = &afu_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_ATTRS)) + device_remove_file(&afu->dev, &afu_attrs[i]); + } + return rc; +} + +int cxl_sysfs_afu_m_add(struct cxl_afu *afu) +{ + struct device_attribute *dev_attr; + int i, rc; + + for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) { + dev_attr = &afu_master_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_MASTER_ATTRS)) { + if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i]))) + goto err; + } + } + + return 0; + +err: + for (i--; i >= 0; i--) { + dev_attr = &afu_master_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_MASTER_ATTRS)) + device_remove_file(afu->chardev_m, &afu_master_attrs[i]); + } + return rc; +} + +void cxl_sysfs_afu_m_remove(struct cxl_afu *afu) +{ + struct device_attribute *dev_attr; + int i; + + for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) { + dev_attr = &afu_master_attrs[i]; + if (cxl_ops->support_attributes(dev_attr->attr.name, + CXL_AFU_MASTER_ATTRS)) + device_remove_file(afu->chardev_m, &afu_master_attrs[i]); + } +} -- cgit v1.2.3