libnvdimm, nfit: add interleave-set state-tracking infrastructure
On platforms that have firmware support for reading/writing per-dimm label space, a portion of the dimm may be accessible via an interleave set PMEM mapping in addition to the dimm's BLK (block-data-window aperture(s)) interface. A label, stored in a "configuration data region" on the dimm, disambiguates which dimm addresses are accessed through which exclusive interface. Add infrastructure that allows the kernel to block modifications to a label in the set while any member dimm is active. Note that this is meant only for enforcing "no modifications of active labels" via the coarse ioctl command. Adding/deleting namespaces from an active interleave set is always possible via sysfs. Another aspect of tracking interleave sets is tracking their integrity when DIMMs in a set are physically re-ordered. For this purpose we generate an "interleave-set cookie" that can be recorded in a label and validated against the current configuration. It is the bus provider implementation's responsibility to calculate the interleave set cookie and attach it to a given region. Cc: Neil Brown <neilb@suse.de> Cc: <linux-acpi@vger.kernel.org> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Robert Moore <robert.moore@intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
Родитель
9f53f9fa4a
Коммит
eaf961536e
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@ -16,6 +16,7 @@
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#include <linux/ndctl.h>
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#include <linux/list.h>
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#include <linux/acpi.h>
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#include <linux/sort.h>
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#include "nfit.h"
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static bool force_enable_dimms;
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@ -785,6 +786,91 @@ static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
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NULL,
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};
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/* enough info to uniquely specify an interleave set */
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struct nfit_set_info {
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struct nfit_set_info_map {
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u64 region_offset;
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u32 serial_number;
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u32 pad;
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} mapping[0];
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};
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static size_t sizeof_nfit_set_info(int num_mappings)
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{
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return sizeof(struct nfit_set_info)
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+ num_mappings * sizeof(struct nfit_set_info_map);
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}
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static int cmp_map(const void *m0, const void *m1)
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{
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const struct nfit_set_info_map *map0 = m0;
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const struct nfit_set_info_map *map1 = m1;
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return memcmp(&map0->region_offset, &map1->region_offset,
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sizeof(u64));
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}
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/* Retrieve the nth entry referencing this spa */
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static struct acpi_nfit_memory_map *memdev_from_spa(
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struct acpi_nfit_desc *acpi_desc, u16 range_index, int n)
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{
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struct nfit_memdev *nfit_memdev;
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list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list)
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if (nfit_memdev->memdev->range_index == range_index)
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if (n-- == 0)
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return nfit_memdev->memdev;
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return NULL;
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}
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static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
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struct nd_region_desc *ndr_desc,
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struct acpi_nfit_system_address *spa)
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{
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int i, spa_type = nfit_spa_type(spa);
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struct device *dev = acpi_desc->dev;
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struct nd_interleave_set *nd_set;
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u16 nr = ndr_desc->num_mappings;
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struct nfit_set_info *info;
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if (spa_type == NFIT_SPA_PM || spa_type == NFIT_SPA_VOLATILE)
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/* pass */;
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else
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return 0;
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nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
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if (!nd_set)
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return -ENOMEM;
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info = devm_kzalloc(dev, sizeof_nfit_set_info(nr), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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for (i = 0; i < nr; i++) {
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struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
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struct nfit_set_info_map *map = &info->mapping[i];
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struct nvdimm *nvdimm = nd_mapping->nvdimm;
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struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
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struct acpi_nfit_memory_map *memdev = memdev_from_spa(acpi_desc,
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spa->range_index, i);
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if (!memdev || !nfit_mem->dcr) {
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dev_err(dev, "%s: failed to find DCR\n", __func__);
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return -ENODEV;
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}
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map->region_offset = memdev->region_offset;
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map->serial_number = nfit_mem->dcr->serial_number;
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}
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sort(&info->mapping[0], nr, sizeof(struct nfit_set_info_map),
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cmp_map, NULL);
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nd_set->cookie = nd_fletcher64(info, sizeof_nfit_set_info(nr), 0);
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ndr_desc->nd_set = nd_set;
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devm_kfree(dev, info);
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return 0;
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}
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static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
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struct nd_mapping *nd_mapping, struct nd_region_desc *ndr_desc,
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struct acpi_nfit_memory_map *memdev,
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@ -838,7 +924,7 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
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struct nd_region_desc ndr_desc;
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struct nvdimm_bus *nvdimm_bus;
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struct resource res;
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int count = 0;
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int count = 0, rc;
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if (spa->range_index == 0) {
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dev_dbg(acpi_desc->dev, "%s: detected invalid spa index\n",
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@ -857,7 +943,6 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
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list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
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struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
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struct nd_mapping *nd_mapping;
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int rc;
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if (memdev->range_index != spa->range_index)
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continue;
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@ -875,6 +960,10 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
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ndr_desc.nd_mapping = nd_mappings;
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ndr_desc.num_mappings = count;
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rc = acpi_nfit_init_interleave_set(acpi_desc, &ndr_desc, spa);
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if (rc)
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return rc;
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nvdimm_bus = acpi_desc->nvdimm_bus;
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if (nfit_spa_type(spa) == NFIT_SPA_PM) {
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if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
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@ -68,6 +68,21 @@ static struct module *to_bus_provider(struct device *dev)
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return NULL;
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}
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static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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nvdimm_bus->probe_active++;
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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if (--nvdimm_bus->probe_active == 0)
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wake_up(&nvdimm_bus->probe_wait);
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static int nvdimm_bus_probe(struct device *dev)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
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@ -78,7 +93,12 @@ static int nvdimm_bus_probe(struct device *dev)
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if (!try_module_get(provider))
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return -ENXIO;
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nvdimm_bus_probe_start(nvdimm_bus);
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rc = nd_drv->probe(dev);
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if (rc == 0)
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nd_region_probe_success(nvdimm_bus, dev);
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nvdimm_bus_probe_end(nvdimm_bus);
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dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
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dev_name(dev), rc);
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if (rc != 0)
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@ -94,6 +114,8 @@ static int nvdimm_bus_remove(struct device *dev)
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int rc;
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rc = nd_drv->remove(dev);
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nd_region_disable(nvdimm_bus, dev);
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dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
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dev_name(dev), rc);
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module_put(provider);
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@ -359,6 +381,34 @@ u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
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}
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EXPORT_SYMBOL_GPL(nd_cmd_out_size);
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static void wait_nvdimm_bus_probe_idle(struct nvdimm_bus *nvdimm_bus)
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{
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do {
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if (nvdimm_bus->probe_active == 0)
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break;
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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wait_event(nvdimm_bus->probe_wait,
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nvdimm_bus->probe_active == 0);
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nvdimm_bus_lock(&nvdimm_bus->dev);
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} while (true);
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}
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/* set_config requires an idle interleave set */
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static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
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{
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struct nvdimm_bus *nvdimm_bus;
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if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
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return 0;
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nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
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wait_nvdimm_bus_probe_idle(nvdimm_bus);
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if (atomic_read(&nvdimm->busy))
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return -EBUSY;
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return 0;
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}
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static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
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int read_only, unsigned int ioctl_cmd, unsigned long arg)
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{
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@ -469,11 +519,18 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
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goto out;
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}
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nvdimm_bus_lock(&nvdimm_bus->dev);
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rc = nd_cmd_clear_to_send(nvdimm, cmd);
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if (rc)
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goto out_unlock;
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rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
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if (rc < 0)
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goto out;
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goto out_unlock;
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if (copy_to_user(p, buf, buf_len))
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rc = -EFAULT;
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out_unlock:
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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out:
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vfree(buf);
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return rc;
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@ -54,6 +54,22 @@ bool is_nvdimm_bus_locked(struct device *dev)
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}
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EXPORT_SYMBOL(is_nvdimm_bus_locked);
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u64 nd_fletcher64(void *addr, size_t len, bool le)
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{
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u32 *buf = addr;
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u32 lo32 = 0;
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u64 hi32 = 0;
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int i;
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for (i = 0; i < len / sizeof(u32); i++) {
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lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
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hi32 += lo32;
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}
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return hi32 << 32 | lo32;
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}
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EXPORT_SYMBOL_GPL(nd_fletcher64);
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static void nvdimm_bus_release(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus;
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@ -175,6 +191,7 @@ struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
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if (!nvdimm_bus)
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return NULL;
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INIT_LIST_HEAD(&nvdimm_bus->list);
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init_waitqueue_head(&nvdimm_bus->probe_wait);
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nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
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mutex_init(&nvdimm_bus->reconfig_mutex);
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if (nvdimm_bus->id < 0) {
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@ -185,7 +185,24 @@ static ssize_t commands_show(struct device *dev,
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}
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static DEVICE_ATTR_RO(commands);
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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 struct attribute *nvdimm_attributes[] = {
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&dev_attr_state.attr,
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&dev_attr_commands.attr,
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NULL,
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};
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@ -213,7 +230,7 @@ struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus, void *provider_data,
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nvdimm->provider_data = provider_data;
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nvdimm->flags = flags;
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nvdimm->dsm_mask = dsm_mask;
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atomic_set(&nvdimm->busy, 0);
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dev = &nvdimm->dev;
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dev_set_name(dev, "nmem%d", nvdimm->id);
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dev->parent = &nvdimm_bus->dev;
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@ -14,6 +14,9 @@
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#define __ND_CORE_H__
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#include <linux/libnvdimm.h>
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#include <linux/device.h>
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#include <linux/libnvdimm.h>
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#include <linux/sizes.h>
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#include <linux/mutex.h>
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extern struct list_head nvdimm_bus_list;
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extern struct mutex nvdimm_bus_list_mutex;
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@ -21,10 +24,11 @@ extern int nvdimm_major;
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struct nvdimm_bus {
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struct nvdimm_bus_descriptor *nd_desc;
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wait_queue_head_t probe_wait;
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struct module *module;
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struct list_head list;
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struct device dev;
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int id;
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int id, probe_active;
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struct mutex reconfig_mutex;
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};
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@ -33,6 +37,7 @@ struct nvdimm {
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void *provider_data;
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unsigned long *dsm_mask;
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struct device dev;
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atomic_t busy;
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int id;
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};
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@ -42,10 +47,13 @@ bool is_nd_pmem(struct device *dev);
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struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev);
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int __init nvdimm_bus_init(void);
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void nvdimm_bus_exit(void);
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void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev);
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int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus);
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void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus);
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void nd_synchronize(void);
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int nvdimm_bus_register_dimms(struct nvdimm_bus *nvdimm_bus);
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int nvdimm_bus_register_regions(struct nvdimm_bus *nvdimm_bus);
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int nvdimm_bus_init_interleave_sets(struct nvdimm_bus *nvdimm_bus);
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int nd_match_dimm(struct device *dev, void *data);
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#endif /* __ND_CORE_H__ */
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@ -35,6 +35,7 @@ struct nd_region {
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u64 ndr_start;
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int id;
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void *provider_data;
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struct nd_interleave_set *nd_set;
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struct nd_mapping mapping[0];
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};
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@ -10,7 +10,10 @@
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/scatterlist.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include <linux/io.h>
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#include "nd-core.h"
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#include "nd.h"
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@ -133,6 +136,21 @@ static ssize_t nstype_show(struct device *dev,
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}
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static DEVICE_ATTR_RO(nstype);
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static ssize_t set_cookie_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct nd_region *nd_region = to_nd_region(dev);
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struct nd_interleave_set *nd_set = nd_region->nd_set;
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if (is_nd_pmem(dev) && nd_set)
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/* pass, should be precluded by region_visible */;
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else
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return -ENXIO;
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return sprintf(buf, "%#llx\n", nd_set->cookie);
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}
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static DEVICE_ATTR_RO(set_cookie);
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static ssize_t init_namespaces_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@ -154,15 +172,65 @@ static struct attribute *nd_region_attributes[] = {
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&dev_attr_size.attr,
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&dev_attr_nstype.attr,
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&dev_attr_mappings.attr,
|
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&dev_attr_set_cookie.attr,
|
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&dev_attr_init_namespaces.attr,
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NULL,
|
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};
|
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|
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static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
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{
|
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struct device *dev = container_of(kobj, typeof(*dev), kobj);
|
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struct nd_region *nd_region = to_nd_region(dev);
|
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struct nd_interleave_set *nd_set = nd_region->nd_set;
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|
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if (a != &dev_attr_set_cookie.attr)
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return a->mode;
|
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|
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if (is_nd_pmem(dev) && nd_set)
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return a->mode;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct attribute_group nd_region_attribute_group = {
|
||||
.attrs = nd_region_attributes,
|
||||
.is_visible = region_visible,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(nd_region_attribute_group);
|
||||
|
||||
/*
|
||||
* Upon successful probe/remove, take/release a reference on the
|
||||
* associated interleave set (if present)
|
||||
*/
|
||||
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
|
||||
struct device *dev, bool probe)
|
||||
{
|
||||
if (is_nd_pmem(dev) || is_nd_blk(dev)) {
|
||||
struct nd_region *nd_region = to_nd_region(dev);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < nd_region->ndr_mappings; i++) {
|
||||
struct nd_mapping *nd_mapping = &nd_region->mapping[i];
|
||||
struct nvdimm *nvdimm = nd_mapping->nvdimm;
|
||||
|
||||
if (probe)
|
||||
atomic_inc(&nvdimm->busy);
|
||||
else
|
||||
atomic_dec(&nvdimm->busy);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
|
||||
{
|
||||
nd_region_notify_driver_action(nvdimm_bus, dev, true);
|
||||
}
|
||||
|
||||
void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
|
||||
{
|
||||
nd_region_notify_driver_action(nvdimm_bus, dev, false);
|
||||
}
|
||||
|
||||
static ssize_t mappingN(struct device *dev, char *buf, int n)
|
||||
{
|
||||
struct nd_region *nd_region = to_nd_region(dev);
|
||||
|
|
@ -322,6 +390,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
|
|||
}
|
||||
nd_region->ndr_mappings = ndr_desc->num_mappings;
|
||||
nd_region->provider_data = ndr_desc->provider_data;
|
||||
nd_region->nd_set = ndr_desc->nd_set;
|
||||
dev = &nd_region->dev;
|
||||
dev_set_name(dev, "region%d", nd_region->id);
|
||||
dev->parent = &nvdimm_bus->dev;
|
||||
|
|
|
|||
|
|
@ -61,11 +61,16 @@ struct nd_cmd_desc {
|
|||
int out_sizes[ND_CMD_MAX_ELEM];
|
||||
};
|
||||
|
||||
struct nd_interleave_set {
|
||||
u64 cookie;
|
||||
};
|
||||
|
||||
struct nd_region_desc {
|
||||
struct resource *res;
|
||||
struct nd_mapping *nd_mapping;
|
||||
u16 num_mappings;
|
||||
const struct attribute_group **attr_groups;
|
||||
struct nd_interleave_set *nd_set;
|
||||
void *provider_data;
|
||||
};
|
||||
|
||||
|
|
@ -101,4 +106,5 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
|
|||
struct nd_region_desc *ndr_desc);
|
||||
struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
|
||||
struct nd_region_desc *ndr_desc);
|
||||
u64 nd_fletcher64(void *addr, size_t len, bool le);
|
||||
#endif /* __LIBNVDIMM_H__ */
|
||||
|
|
|
|||
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