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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
- CXL RAM region enumeration: instantiate 'struct cxl_region' objects for platform firmware created memory regions - CXL RAM region provisioning: complement the existing PMEM region creation support with RAM region support - "Soft Reservation" policy change: Online (memory hot-add) soft-reserved memory (EFI_MEMORY_SP) by default, but still allow for setting aside such memory for dedicated access via device-dax. - CXL Events and Interrupts: Takeover CXL event handling from platform-firmware (ACPI calls this CXL Memory Error Reporting) and export CXL Events via Linux Trace Events. - Convey CXL _OSC results to drivers: Similar to PCI, let the CXL subsystem interrogate the result of CXL _OSC negotiation. - Emulate CXL DVSEC Range Registers as "decoders": Allow for first-generation devices that pre-date the definition of the CXL HDM Decoder Capability to translate the CXL DVSEC Range Registers into 'struct cxl_decoder' objects. - Set timestamp: Per spec, set the device timestamp in case of hotplug, or if platform-firwmare failed to set it. - General fixups: linux-next build issues, non-urgent fixes for pre-production hardware, unit test fixes, spelling and debug message improvements. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSbo+XnGs+rwLz9XGXfioYZHlFsZwUCY/WYcgAKCRDfioYZHlFs Z6m3APkBUtiEEm1o8ikdu5llUS1OTLBwqjJDwGMTyf8X/WDXhgD+J2mLsCgARS7X 5IS0RAtefutrW5sQpUucPM7QiLuraAY= =kOXC -----END PGP SIGNATURE----- Merge tag 'cxl-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl Pull Compute Express Link (CXL) updates from Dan Williams: "To date Linux has been dependent on platform-firmware to map CXL RAM regions and handle events / errors from devices. With this update we can now parse / update the CXL memory layout, and report events / errors from devices. This is a precursor for the CXL subsystem to handle the end-to-end "RAS" flow for CXL memory. i.e. the flow that for DDR-attached-DRAM is handled by the EDAC driver where it maps system physical address events to a field-replaceable-unit (FRU / endpoint device). In general, CXL has the potential to standardize what has historically been a pile of memory-controller-specific error handling logic. Another change of note is the default policy for handling RAM-backed device-dax instances. Previously the default access mode was "device", mmap(2) a device special file to access memory. The new default is "kmem" where the address range is assigned to the core-mm via add_memory_driver_managed(). This saves typical users from wondering why their platform memory is not visible via free(1) and stuck behind a device-file. At the same time it allows expert users to deploy policy to, for example, get dedicated access to high performance memory, or hide low performance memory from general purpose kernel allocations. This affects not only CXL, but also systems with high-bandwidth-memory that platform-firmware tags with the EFI_MEMORY_SP (special purpose) designation. Summary: - CXL RAM region enumeration: instantiate 'struct cxl_region' objects for platform firmware created memory regions - CXL RAM region provisioning: complement the existing PMEM region creation support with RAM region support - "Soft Reservation" policy change: Online (memory hot-add) soft-reserved memory (EFI_MEMORY_SP) by default, but still allow for setting aside such memory for dedicated access via device-dax. - CXL Events and Interrupts: Takeover CXL event handling from platform-firmware (ACPI calls this CXL Memory Error Reporting) and export CXL Events via Linux Trace Events. - Convey CXL _OSC results to drivers: Similar to PCI, let the CXL subsystem interrogate the result of CXL _OSC negotiation. - Emulate CXL DVSEC Range Registers as "decoders": Allow for first-generation devices that pre-date the definition of the CXL HDM Decoder Capability to translate the CXL DVSEC Range Registers into 'struct cxl_decoder' objects. - Set timestamp: Per spec, set the device timestamp in case of hotplug, or if platform-firwmare failed to set it. - General fixups: linux-next build issues, non-urgent fixes for pre-production hardware, unit test fixes, spelling and debug message improvements" * tag 'cxl-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (66 commits) dax/kmem: Fix leak of memory-hotplug resources cxl/mem: Add kdoc param for event log driver state cxl/trace: Add serial number to trace points cxl/trace: Add host output to trace points cxl/trace: Standardize device information output cxl/pci: Remove locked check for dvsec_range_allowed() cxl/hdm: Add emulation when HDM decoders are not committed cxl/hdm: Create emulated cxl_hdm for devices that do not have HDM decoders cxl/hdm: Emulate HDM decoder from DVSEC range registers cxl/pci: Refactor cxl_hdm_decode_init() cxl/port: Export cxl_dvsec_rr_decode() to cxl_port cxl/pci: Break out range register decoding from cxl_hdm_decode_init() cxl: add RAS status unmasking for CXL cxl: remove unnecessary calling of pci_enable_pcie_error_reporting() dax/hmem: build hmem device support as module if possible dax: cxl: add CXL_REGION dependency cxl: avoid returning uninitialized error code cxl/pmem: Fix nvdimm registration races cxl/mem: Fix UAPI command comment cxl/uapi: Tag commands from cxl_query_cmd() ...
881 lines
21 KiB
C
881 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/moduleparam.h>
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#include <linux/vmalloc.h>
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#include <linux/device.h>
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#include <linux/ndctl.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include "nd-core.h"
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#include "label.h"
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#include "pmem.h"
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#include "nd.h"
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static DEFINE_IDA(dimm_ida);
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/*
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* Retrieve bus and dimm handle and return if this bus supports
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* get_config_data commands
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*/
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int nvdimm_check_config_data(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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if (!nvdimm->cmd_mask ||
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!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
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if (test_bit(NDD_LABELING, &nvdimm->flags))
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return -ENXIO;
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else
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return -ENOTTY;
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}
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return 0;
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}
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static int validate_dimm(struct nvdimm_drvdata *ndd)
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{
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int rc;
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if (!ndd)
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return -EINVAL;
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rc = nvdimm_check_config_data(ndd->dev);
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if (rc)
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dev_dbg(ndd->dev, "%ps: %s error: %d\n",
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__builtin_return_address(0), __func__, rc);
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return rc;
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}
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/**
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* nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
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* @nvdimm: dimm to initialize
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*/
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int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
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{
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struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
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struct nvdimm_bus_descriptor *nd_desc;
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int rc = validate_dimm(ndd);
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int cmd_rc = 0;
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if (rc)
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return rc;
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if (cmd->config_size)
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return 0; /* already valid */
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memset(cmd, 0, sizeof(*cmd));
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nd_desc = nvdimm_bus->nd_desc;
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
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ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
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if (rc < 0)
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return rc;
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return cmd_rc;
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}
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int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
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size_t offset, size_t len)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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int rc = validate_dimm(ndd), cmd_rc = 0;
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struct nd_cmd_get_config_data_hdr *cmd;
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size_t max_cmd_size, buf_offset;
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if (rc)
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return rc;
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if (offset + len > ndd->nsarea.config_size)
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return -ENXIO;
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max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
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cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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for (buf_offset = 0; len;
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len -= cmd->in_length, buf_offset += cmd->in_length) {
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size_t cmd_size;
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cmd->in_offset = offset + buf_offset;
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cmd->in_length = min(max_cmd_size, len);
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cmd_size = sizeof(*cmd) + cmd->in_length;
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
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ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
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if (rc < 0)
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break;
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if (cmd_rc < 0) {
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rc = cmd_rc;
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break;
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}
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/* out_buf should be valid, copy it into our output buffer */
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memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
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}
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kvfree(cmd);
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return rc;
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}
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int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
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void *buf, size_t len)
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{
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size_t max_cmd_size, buf_offset;
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struct nd_cmd_set_config_hdr *cmd;
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int rc = validate_dimm(ndd), cmd_rc = 0;
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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if (rc)
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return rc;
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if (offset + len > ndd->nsarea.config_size)
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return -ENXIO;
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max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
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cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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for (buf_offset = 0; len; len -= cmd->in_length,
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buf_offset += cmd->in_length) {
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size_t cmd_size;
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cmd->in_offset = offset + buf_offset;
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cmd->in_length = min(max_cmd_size, len);
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memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
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/* status is output in the last 4-bytes of the command buffer */
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cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
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rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
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ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
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if (rc < 0)
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break;
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if (cmd_rc < 0) {
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rc = cmd_rc;
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break;
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}
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}
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kvfree(cmd);
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return rc;
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}
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void nvdimm_set_labeling(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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set_bit(NDD_LABELING, &nvdimm->flags);
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}
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void nvdimm_set_locked(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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set_bit(NDD_LOCKED, &nvdimm->flags);
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}
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void nvdimm_clear_locked(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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clear_bit(NDD_LOCKED, &nvdimm->flags);
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}
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static void nvdimm_release(struct device *dev)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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ida_simple_remove(&dimm_ida, nvdimm->id);
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kfree(nvdimm);
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}
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struct nvdimm *to_nvdimm(struct device *dev)
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{
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struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
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WARN_ON(!is_nvdimm(dev));
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return nvdimm;
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}
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EXPORT_SYMBOL_GPL(to_nvdimm);
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struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
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{
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
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return dev_get_drvdata(&nvdimm->dev);
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}
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EXPORT_SYMBOL(to_ndd);
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void nvdimm_drvdata_release(struct kref *kref)
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{
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struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
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struct device *dev = ndd->dev;
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struct resource *res, *_r;
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dev_dbg(dev, "trace\n");
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nvdimm_bus_lock(dev);
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for_each_dpa_resource_safe(ndd, res, _r)
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nvdimm_free_dpa(ndd, res);
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nvdimm_bus_unlock(dev);
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kvfree(ndd->data);
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kfree(ndd);
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put_device(dev);
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}
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void get_ndd(struct nvdimm_drvdata *ndd)
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{
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kref_get(&ndd->kref);
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}
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void put_ndd(struct nvdimm_drvdata *ndd)
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{
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if (ndd)
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kref_put(&ndd->kref, nvdimm_drvdata_release);
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}
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const char *nvdimm_name(struct nvdimm *nvdimm)
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{
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return dev_name(&nvdimm->dev);
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}
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EXPORT_SYMBOL_GPL(nvdimm_name);
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struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
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{
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return &nvdimm->dev.kobj;
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}
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EXPORT_SYMBOL_GPL(nvdimm_kobj);
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unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
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{
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return nvdimm->cmd_mask;
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}
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EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
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void *nvdimm_provider_data(struct nvdimm *nvdimm)
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{
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if (nvdimm)
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return nvdimm->provider_data;
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nvdimm_provider_data);
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static ssize_t commands_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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int cmd, len = 0;
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if (!nvdimm->cmd_mask)
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return sprintf(buf, "\n");
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for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
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len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
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len += sprintf(buf + len, "\n");
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return len;
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}
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static DEVICE_ATTR_RO(commands);
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static ssize_t flags_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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return sprintf(buf, "%s%s\n",
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test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
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test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
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}
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static DEVICE_ATTR_RO(flags);
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static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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/*
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* The state may be in the process of changing, userspace should
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* quiesce probing if it wants a static answer
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*/
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nvdimm_bus_lock(dev);
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nvdimm_bus_unlock(dev);
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return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
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? "active" : "idle");
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}
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static DEVICE_ATTR_RO(state);
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static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf)
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{
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struct device *dev;
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ssize_t rc;
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u32 nfree;
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if (!ndd)
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return -ENXIO;
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dev = ndd->dev;
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nvdimm_bus_lock(dev);
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nfree = nd_label_nfree(ndd);
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if (nfree - 1 > nfree) {
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dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
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nfree = 0;
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} else
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nfree--;
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rc = sprintf(buf, "%d\n", nfree);
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nvdimm_bus_unlock(dev);
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return rc;
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}
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static ssize_t available_slots_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t rc;
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device_lock(dev);
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rc = __available_slots_show(dev_get_drvdata(dev), buf);
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RO(available_slots);
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ssize_t security_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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/*
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* For the test version we need to poll the "hardware" in order
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* to get the updated status for unlock testing.
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*/
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if (IS_ENABLED(CONFIG_NVDIMM_SECURITY_TEST))
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nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
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if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
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return sprintf(buf, "overwrite\n");
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if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
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return sprintf(buf, "disabled\n");
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if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
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return sprintf(buf, "unlocked\n");
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if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
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return sprintf(buf, "locked\n");
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return -ENOTTY;
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}
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static ssize_t frozen_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nvdimm *nvdimm = to_nvdimm(dev);
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return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
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&nvdimm->sec.flags));
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}
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static DEVICE_ATTR_RO(frozen);
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static ssize_t security_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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ssize_t rc;
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/*
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* Require all userspace triggered security management to be
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* done while probing is idle and the DIMM is not in active use
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* in any region.
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*/
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device_lock(dev);
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nvdimm_bus_lock(dev);
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wait_nvdimm_bus_probe_idle(dev);
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rc = nvdimm_security_store(dev, buf, len);
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nvdimm_bus_unlock(dev);
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device_unlock(dev);
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return rc;
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}
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static DEVICE_ATTR_RW(security);
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static struct attribute *nvdimm_attributes[] = {
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&dev_attr_state.attr,
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&dev_attr_flags.attr,
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&dev_attr_commands.attr,
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&dev_attr_available_slots.attr,
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&dev_attr_security.attr,
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&dev_attr_frozen.attr,
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NULL,
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};
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static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, typeof(*dev), kobj);
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
|
|
if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
|
|
return a->mode;
|
|
if (!nvdimm->sec.flags)
|
|
return 0;
|
|
|
|
if (a == &dev_attr_security.attr) {
|
|
/* Are there any state mutation ops (make writable)? */
|
|
if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
|
|
|| nvdimm->sec.ops->change_key
|
|
|| nvdimm->sec.ops->erase
|
|
|| nvdimm->sec.ops->overwrite)
|
|
return a->mode;
|
|
return 0444;
|
|
}
|
|
|
|
if (nvdimm->sec.ops->freeze)
|
|
return a->mode;
|
|
return 0;
|
|
}
|
|
|
|
static const struct attribute_group nvdimm_attribute_group = {
|
|
.attrs = nvdimm_attributes,
|
|
.is_visible = nvdimm_visible,
|
|
};
|
|
|
|
static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
enum nvdimm_fwa_result result;
|
|
|
|
if (!nvdimm->fw_ops)
|
|
return -EOPNOTSUPP;
|
|
|
|
nvdimm_bus_lock(dev);
|
|
result = nvdimm->fw_ops->activate_result(nvdimm);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
switch (result) {
|
|
case NVDIMM_FWA_RESULT_NONE:
|
|
return sprintf(buf, "none\n");
|
|
case NVDIMM_FWA_RESULT_SUCCESS:
|
|
return sprintf(buf, "success\n");
|
|
case NVDIMM_FWA_RESULT_FAIL:
|
|
return sprintf(buf, "fail\n");
|
|
case NVDIMM_FWA_RESULT_NOTSTAGED:
|
|
return sprintf(buf, "not_staged\n");
|
|
case NVDIMM_FWA_RESULT_NEEDRESET:
|
|
return sprintf(buf, "need_reset\n");
|
|
default:
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
static DEVICE_ATTR_ADMIN_RO(result);
|
|
|
|
static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
enum nvdimm_fwa_state state;
|
|
|
|
if (!nvdimm->fw_ops)
|
|
return -EOPNOTSUPP;
|
|
|
|
nvdimm_bus_lock(dev);
|
|
state = nvdimm->fw_ops->activate_state(nvdimm);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
switch (state) {
|
|
case NVDIMM_FWA_IDLE:
|
|
return sprintf(buf, "idle\n");
|
|
case NVDIMM_FWA_BUSY:
|
|
return sprintf(buf, "busy\n");
|
|
case NVDIMM_FWA_ARMED:
|
|
return sprintf(buf, "armed\n");
|
|
default:
|
|
return -ENXIO;
|
|
}
|
|
}
|
|
|
|
static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
enum nvdimm_fwa_trigger arg;
|
|
int rc;
|
|
|
|
if (!nvdimm->fw_ops)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (sysfs_streq(buf, "arm"))
|
|
arg = NVDIMM_FWA_ARM;
|
|
else if (sysfs_streq(buf, "disarm"))
|
|
arg = NVDIMM_FWA_DISARM;
|
|
else
|
|
return -EINVAL;
|
|
|
|
nvdimm_bus_lock(dev);
|
|
rc = nvdimm->fw_ops->arm(nvdimm, arg);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
return len;
|
|
}
|
|
static DEVICE_ATTR_ADMIN_RW(activate);
|
|
|
|
static struct attribute *nvdimm_firmware_attributes[] = {
|
|
&dev_attr_activate.attr,
|
|
&dev_attr_result.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
|
|
{
|
|
struct device *dev = container_of(kobj, typeof(*dev), kobj);
|
|
struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
|
|
struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
enum nvdimm_fwa_capability cap;
|
|
|
|
if (!nd_desc->fw_ops)
|
|
return 0;
|
|
if (!nvdimm->fw_ops)
|
|
return 0;
|
|
|
|
nvdimm_bus_lock(dev);
|
|
cap = nd_desc->fw_ops->capability(nd_desc);
|
|
nvdimm_bus_unlock(dev);
|
|
|
|
if (cap < NVDIMM_FWA_CAP_QUIESCE)
|
|
return 0;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
static const struct attribute_group nvdimm_firmware_attribute_group = {
|
|
.name = "firmware",
|
|
.attrs = nvdimm_firmware_attributes,
|
|
.is_visible = nvdimm_firmware_visible,
|
|
};
|
|
|
|
static const struct attribute_group *nvdimm_attribute_groups[] = {
|
|
&nd_device_attribute_group,
|
|
&nvdimm_attribute_group,
|
|
&nvdimm_firmware_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static const struct device_type nvdimm_device_type = {
|
|
.name = "nvdimm",
|
|
.release = nvdimm_release,
|
|
.groups = nvdimm_attribute_groups,
|
|
};
|
|
|
|
bool is_nvdimm(const struct device *dev)
|
|
{
|
|
return dev->type == &nvdimm_device_type;
|
|
}
|
|
|
|
static struct lock_class_key nvdimm_key;
|
|
|
|
struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
|
|
void *provider_data, const struct attribute_group **groups,
|
|
unsigned long flags, unsigned long cmd_mask, int num_flush,
|
|
struct resource *flush_wpq, const char *dimm_id,
|
|
const struct nvdimm_security_ops *sec_ops,
|
|
const struct nvdimm_fw_ops *fw_ops)
|
|
{
|
|
struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
|
|
struct device *dev;
|
|
|
|
if (!nvdimm)
|
|
return NULL;
|
|
|
|
nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
|
|
if (nvdimm->id < 0) {
|
|
kfree(nvdimm);
|
|
return NULL;
|
|
}
|
|
|
|
nvdimm->dimm_id = dimm_id;
|
|
nvdimm->provider_data = provider_data;
|
|
nvdimm->flags = flags;
|
|
nvdimm->cmd_mask = cmd_mask;
|
|
nvdimm->num_flush = num_flush;
|
|
nvdimm->flush_wpq = flush_wpq;
|
|
atomic_set(&nvdimm->busy, 0);
|
|
dev = &nvdimm->dev;
|
|
dev_set_name(dev, "nmem%d", nvdimm->id);
|
|
dev->parent = &nvdimm_bus->dev;
|
|
dev->type = &nvdimm_device_type;
|
|
dev->devt = MKDEV(nvdimm_major, nvdimm->id);
|
|
dev->groups = groups;
|
|
nvdimm->sec.ops = sec_ops;
|
|
nvdimm->fw_ops = fw_ops;
|
|
nvdimm->sec.overwrite_tmo = 0;
|
|
INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
|
|
/*
|
|
* Security state must be initialized before device_add() for
|
|
* attribute visibility.
|
|
*/
|
|
/* get security state and extended (master) state */
|
|
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
|
|
nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
|
|
device_initialize(dev);
|
|
lockdep_set_class(&dev->mutex, &nvdimm_key);
|
|
if (test_bit(NDD_REGISTER_SYNC, &flags))
|
|
nd_device_register_sync(dev);
|
|
else
|
|
nd_device_register(dev);
|
|
|
|
return nvdimm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__nvdimm_create);
|
|
|
|
void nvdimm_delete(struct nvdimm *nvdimm)
|
|
{
|
|
struct device *dev = &nvdimm->dev;
|
|
bool dev_put = false;
|
|
|
|
/* We are shutting down. Make state frozen artificially. */
|
|
nvdimm_bus_lock(dev);
|
|
set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
|
|
if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
|
|
dev_put = true;
|
|
nvdimm_bus_unlock(dev);
|
|
cancel_delayed_work_sync(&nvdimm->dwork);
|
|
if (dev_put)
|
|
put_device(dev);
|
|
nd_device_unregister(dev, ND_SYNC);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_delete);
|
|
|
|
static void shutdown_security_notify(void *data)
|
|
{
|
|
struct nvdimm *nvdimm = data;
|
|
|
|
sysfs_put(nvdimm->sec.overwrite_state);
|
|
}
|
|
|
|
int nvdimm_security_setup_events(struct device *dev)
|
|
{
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
|
|
if (!nvdimm->sec.flags || !nvdimm->sec.ops
|
|
|| !nvdimm->sec.ops->overwrite)
|
|
return 0;
|
|
nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
|
|
if (!nvdimm->sec.overwrite_state)
|
|
return -ENOMEM;
|
|
|
|
return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
|
|
|
|
int nvdimm_in_overwrite(struct nvdimm *nvdimm)
|
|
{
|
|
return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
|
|
|
|
int nvdimm_security_freeze(struct nvdimm *nvdimm)
|
|
{
|
|
int rc;
|
|
|
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
|
|
|
|
if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!nvdimm->sec.flags)
|
|
return -EIO;
|
|
|
|
if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
|
|
dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
rc = nvdimm->sec.ops->freeze(nvdimm);
|
|
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static unsigned long dpa_align(struct nd_region *nd_region)
|
|
{
|
|
struct device *dev = &nd_region->dev;
|
|
|
|
if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
|
|
"bus lock required for capacity provision\n"))
|
|
return 0;
|
|
if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
|
|
% nd_region->ndr_mappings,
|
|
"invalid region align %#lx mappings: %d\n",
|
|
nd_region->align, nd_region->ndr_mappings))
|
|
return 0;
|
|
return nd_region->align / nd_region->ndr_mappings;
|
|
}
|
|
|
|
/**
|
|
* nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
|
|
* contiguous unallocated dpa range.
|
|
* @nd_region: constrain available space check to this reference region
|
|
* @nd_mapping: container of dpa-resource-root + labels
|
|
*/
|
|
resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
|
|
struct nd_mapping *nd_mapping)
|
|
{
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
struct nvdimm_bus *nvdimm_bus;
|
|
resource_size_t max = 0;
|
|
struct resource *res;
|
|
unsigned long align;
|
|
|
|
/* if a dimm is disabled the available capacity is zero */
|
|
if (!ndd)
|
|
return 0;
|
|
|
|
align = dpa_align(nd_region);
|
|
if (!align)
|
|
return 0;
|
|
|
|
nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
|
|
if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
|
|
return 0;
|
|
for_each_dpa_resource(ndd, res) {
|
|
resource_size_t start, end;
|
|
|
|
if (strcmp(res->name, "pmem-reserve") != 0)
|
|
continue;
|
|
/* trim free space relative to current alignment setting */
|
|
start = ALIGN(res->start, align);
|
|
end = ALIGN_DOWN(res->end + 1, align) - 1;
|
|
if (end < start)
|
|
continue;
|
|
if (end - start + 1 > max)
|
|
max = end - start + 1;
|
|
}
|
|
release_free_pmem(nvdimm_bus, nd_mapping);
|
|
return max;
|
|
}
|
|
|
|
/**
|
|
* nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
|
|
* @nd_mapping: container of dpa-resource-root + labels
|
|
* @nd_region: constrain available space check to this reference region
|
|
*
|
|
* Validate that a PMEM label, if present, aligns with the start of an
|
|
* interleave set.
|
|
*/
|
|
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
|
|
struct nd_mapping *nd_mapping)
|
|
{
|
|
struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
|
|
resource_size_t map_start, map_end, busy = 0;
|
|
struct resource *res;
|
|
unsigned long align;
|
|
|
|
if (!ndd)
|
|
return 0;
|
|
|
|
align = dpa_align(nd_region);
|
|
if (!align)
|
|
return 0;
|
|
|
|
map_start = nd_mapping->start;
|
|
map_end = map_start + nd_mapping->size - 1;
|
|
for_each_dpa_resource(ndd, res) {
|
|
resource_size_t start, end;
|
|
|
|
start = ALIGN_DOWN(res->start, align);
|
|
end = ALIGN(res->end + 1, align) - 1;
|
|
if (start >= map_start && start < map_end) {
|
|
if (end > map_end) {
|
|
nd_dbg_dpa(nd_region, ndd, res,
|
|
"misaligned to iset\n");
|
|
return 0;
|
|
}
|
|
busy += end - start + 1;
|
|
} else if (end >= map_start && end <= map_end) {
|
|
busy += end - start + 1;
|
|
} else if (map_start > start && map_start < end) {
|
|
/* total eclipse of the mapping */
|
|
busy += nd_mapping->size;
|
|
}
|
|
}
|
|
|
|
if (busy < nd_mapping->size)
|
|
return ALIGN_DOWN(nd_mapping->size - busy, align);
|
|
return 0;
|
|
}
|
|
|
|
void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
|
|
{
|
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
|
|
kfree(res->name);
|
|
__release_region(&ndd->dpa, res->start, resource_size(res));
|
|
}
|
|
|
|
struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
|
|
struct nd_label_id *label_id, resource_size_t start,
|
|
resource_size_t n)
|
|
{
|
|
char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
|
|
struct resource *res;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
|
|
res = __request_region(&ndd->dpa, start, n, name, 0);
|
|
if (!res)
|
|
kfree(name);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
|
|
* @nvdimm: container of dpa-resource-root + labels
|
|
* @label_id: dpa resource name of the form pmem-<human readable uuid>
|
|
*/
|
|
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
|
|
struct nd_label_id *label_id)
|
|
{
|
|
resource_size_t allocated = 0;
|
|
struct resource *res;
|
|
|
|
for_each_dpa_resource(ndd, res)
|
|
if (strcmp(res->name, label_id->id) == 0)
|
|
allocated += resource_size(res);
|
|
|
|
return allocated;
|
|
}
|
|
|
|
static int count_dimms(struct device *dev, void *c)
|
|
{
|
|
int *count = c;
|
|
|
|
if (is_nvdimm(dev))
|
|
(*count)++;
|
|
return 0;
|
|
}
|
|
|
|
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
|
|
{
|
|
int count = 0;
|
|
/* Flush any possible dimm registration failures */
|
|
nd_synchronize();
|
|
|
|
device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
|
|
dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
|
|
if (count != dimm_count)
|
|
return -ENXIO;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
|
|
|
|
void __exit nvdimm_devs_exit(void)
|
|
{
|
|
ida_destroy(&dimm_ida);
|
|
}
|