diff options
author | Dan Williams <dan.j.williams@intel.com> | 2022-01-11 08:06:40 -0800 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-26 12:23:01 -0700 |
commit | 04ad63f086d1a9649b8b082748cbc7a570ade461 (patch) | |
tree | b9bfa0e0a44ce367490fbabe100a0ccde8960fc3 /drivers/cxl | |
parent | 99183d26ed6191010fca09518dae34d6aff3cd14 (diff) |
cxl/region: Introduce cxl_pmem_region objects
The LIBNVDIMM subsystem is a platform agnostic representation of system
NVDIMM / persistent memory resources. To date, the CXL subsystem's
interaction with LIBNVDIMM has been to register an nvdimm-bridge device
and cxl_nvdimm objects to proxy CXL capabilities into existing LIBNVDIMM
subsystem mechanics.
With regions the approach is the same. Create a new cxl_pmem_region
object to proxy CXL region details into a LIBNVDIMM definition. With
this enabling LIBNVDIMM can partition CXL persistent memory regions with
legacy namespace labels. A follow-on patch will add CXL region label and
CXL namespace label support to persist region configurations across
driver reload / system-reset events.
Co-developed-by: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165784340111.1758207.3036498385188290968.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
-rw-r--r-- | drivers/cxl/core/core.h | 3 | ||||
-rw-r--r-- | drivers/cxl/core/pmem.c | 4 | ||||
-rw-r--r-- | drivers/cxl/core/port.c | 2 | ||||
-rw-r--r-- | drivers/cxl/core/region.c | 142 | ||||
-rw-r--r-- | drivers/cxl/cxl.h | 36 | ||||
-rw-r--r-- | drivers/cxl/pmem.c | 238 |
6 files changed, 420 insertions, 5 deletions
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h index 391aadf9e7fa..1d8f87be283f 100644 --- a/drivers/cxl/core/core.h +++ b/drivers/cxl/core/core.h @@ -13,11 +13,13 @@ extern struct attribute_group cxl_base_attribute_group; extern struct device_attribute dev_attr_create_pmem_region; extern struct device_attribute dev_attr_delete_region; extern struct device_attribute dev_attr_region; +extern const struct device_type cxl_pmem_region_type; extern const struct device_type cxl_region_type; void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled); #define CXL_REGION_ATTR(x) (&dev_attr_##x.attr) #define CXL_REGION_TYPE(x) (&cxl_region_type) #define SET_CXL_REGION_ATTR(x) (&dev_attr_##x.attr), +#define CXL_PMEM_REGION_TYPE(x) (&cxl_pmem_region_type) int cxl_region_init(void); void cxl_region_exit(void); #else @@ -34,6 +36,7 @@ static inline void cxl_region_exit(void) #define CXL_REGION_ATTR(x) NULL #define CXL_REGION_TYPE(x) NULL #define SET_CXL_REGION_ATTR(x) +#define CXL_PMEM_REGION_TYPE(x) NULL #endif struct cxl_send_command; diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c index bec7cfb54ebf..1d12a8206444 100644 --- a/drivers/cxl/core/pmem.c +++ b/drivers/cxl/core/pmem.c @@ -62,9 +62,9 @@ static int match_nvdimm_bridge(struct device *dev, void *data) return is_cxl_nvdimm_bridge(dev); } -struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_nvdimm *cxl_nvd) +struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *start) { - struct cxl_port *port = find_cxl_root(&cxl_nvd->dev); + struct cxl_port *port = find_cxl_root(start); struct device *dev; if (!port) diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index ba66ce25de30..3d2d0119cc3d 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -44,6 +44,8 @@ static int cxl_device_id(struct device *dev) return CXL_DEVICE_NVDIMM_BRIDGE; if (dev->type == &cxl_nvdimm_type) return CXL_DEVICE_NVDIMM; + if (dev->type == CXL_PMEM_REGION_TYPE()) + return CXL_DEVICE_PMEM_REGION; if (is_cxl_port(dev)) { if (is_cxl_root(to_cxl_port(dev))) return CXL_DEVICE_ROOT; diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index bf4e7f5499c1..dc71ec457608 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1650,6 +1650,139 @@ static ssize_t delete_region_store(struct device *dev, } DEVICE_ATTR_WO(delete_region); +static void cxl_pmem_region_release(struct device *dev) +{ + struct cxl_pmem_region *cxlr_pmem = to_cxl_pmem_region(dev); + int i; + + for (i = 0; i < cxlr_pmem->nr_mappings; i++) { + struct cxl_memdev *cxlmd = cxlr_pmem->mapping[i].cxlmd; + + put_device(&cxlmd->dev); + } + + kfree(cxlr_pmem); +} + +static const struct attribute_group *cxl_pmem_region_attribute_groups[] = { + &cxl_base_attribute_group, + NULL, +}; + +const struct device_type cxl_pmem_region_type = { + .name = "cxl_pmem_region", + .release = cxl_pmem_region_release, + .groups = cxl_pmem_region_attribute_groups, +}; + +bool is_cxl_pmem_region(struct device *dev) +{ + return dev->type == &cxl_pmem_region_type; +} +EXPORT_SYMBOL_NS_GPL(is_cxl_pmem_region, CXL); + +struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) +{ + if (dev_WARN_ONCE(dev, !is_cxl_pmem_region(dev), + "not a cxl_pmem_region device\n")) + return NULL; + return container_of(dev, struct cxl_pmem_region, dev); +} +EXPORT_SYMBOL_NS_GPL(to_cxl_pmem_region, CXL); + +static struct lock_class_key cxl_pmem_region_key; + +static struct cxl_pmem_region *cxl_pmem_region_alloc(struct cxl_region *cxlr) +{ + struct cxl_region_params *p = &cxlr->params; + struct cxl_pmem_region *cxlr_pmem; + struct device *dev; + int i; + + down_read(&cxl_region_rwsem); + if (p->state != CXL_CONFIG_COMMIT) { + cxlr_pmem = ERR_PTR(-ENXIO); + goto out; + } + + cxlr_pmem = kzalloc(struct_size(cxlr_pmem, mapping, p->nr_targets), + GFP_KERNEL); + if (!cxlr_pmem) { + cxlr_pmem = ERR_PTR(-ENOMEM); + goto out; + } + + cxlr_pmem->hpa_range.start = p->res->start; + cxlr_pmem->hpa_range.end = p->res->end; + + /* Snapshot the region configuration underneath the cxl_region_rwsem */ + cxlr_pmem->nr_mappings = p->nr_targets; + for (i = 0; i < p->nr_targets; i++) { + struct cxl_endpoint_decoder *cxled = p->targets[i]; + struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); + struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i]; + + m->cxlmd = cxlmd; + get_device(&cxlmd->dev); + m->start = cxled->dpa_res->start; + m->size = resource_size(cxled->dpa_res); + m->position = i; + } + + dev = &cxlr_pmem->dev; + cxlr_pmem->cxlr = cxlr; + device_initialize(dev); + lockdep_set_class(&dev->mutex, &cxl_pmem_region_key); + device_set_pm_not_required(dev); + dev->parent = &cxlr->dev; + dev->bus = &cxl_bus_type; + dev->type = &cxl_pmem_region_type; +out: + up_read(&cxl_region_rwsem); + + return cxlr_pmem; +} + +static void cxlr_pmem_unregister(void *dev) +{ + device_unregister(dev); +} + +/** + * devm_cxl_add_pmem_region() - add a cxl_region-to-nd_region bridge + * @cxlr: parent CXL region for this pmem region bridge device + * + * Return: 0 on success negative error code on failure. + */ +static int devm_cxl_add_pmem_region(struct cxl_region *cxlr) +{ + struct cxl_pmem_region *cxlr_pmem; + struct device *dev; + int rc; + + cxlr_pmem = cxl_pmem_region_alloc(cxlr); + if (IS_ERR(cxlr_pmem)) + return PTR_ERR(cxlr_pmem); + + dev = &cxlr_pmem->dev; + rc = dev_set_name(dev, "pmem_region%d", cxlr->id); + if (rc) + goto err; + + rc = device_add(dev); + if (rc) + goto err; + + dev_dbg(&cxlr->dev, "%s: register %s\n", dev_name(dev->parent), + dev_name(dev)); + + return devm_add_action_or_reset(&cxlr->dev, cxlr_pmem_unregister, dev); + +err: + put_device(dev); + return rc; +} + static int cxl_region_probe(struct device *dev) { struct cxl_region *cxlr = to_cxl_region(dev); @@ -1673,7 +1806,14 @@ static int cxl_region_probe(struct device *dev) */ up_read(&cxl_region_rwsem); - return rc; + switch (cxlr->mode) { + case CXL_DECODER_PMEM: + return devm_cxl_add_pmem_region(cxlr); + default: + dev_dbg(&cxlr->dev, "unsupported region mode: %d\n", + cxlr->mode); + return -ENXIO; + } } static struct cxl_driver cxl_region_driver = { diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 46d3f173a700..75674400cc8d 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -419,6 +419,25 @@ struct cxl_nvdimm { struct device dev; struct cxl_memdev *cxlmd; struct cxl_nvdimm_bridge *bridge; + struct cxl_pmem_region *region; +}; + +struct cxl_pmem_region_mapping { + struct cxl_memdev *cxlmd; + struct cxl_nvdimm *cxl_nvd; + u64 start; + u64 size; + int position; +}; + +struct cxl_pmem_region { + struct device dev; + struct cxl_region *cxlr; + struct nd_region *nd_region; + struct cxl_nvdimm_bridge *bridge; + struct range hpa_range; + int nr_mappings; + struct cxl_pmem_region_mapping mapping[]; }; /** @@ -601,6 +620,7 @@ void cxl_driver_unregister(struct cxl_driver *cxl_drv); #define CXL_DEVICE_ROOT 4 #define CXL_DEVICE_MEMORY_EXPANDER 5 #define CXL_DEVICE_REGION 6 +#define CXL_DEVICE_PMEM_REGION 7 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") #define CXL_MODALIAS_FMT "cxl:t%d" @@ -612,7 +632,21 @@ struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm_bridge(struct device *dev); int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd); -struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_nvdimm *cxl_nvd); +struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *dev); + +#ifdef CONFIG_CXL_REGION +bool is_cxl_pmem_region(struct device *dev); +struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); +#else +static inline bool is_cxl_pmem_region(struct device *dev) +{ + return false; +} +static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) +{ + return NULL; +} +#endif /* * Unit test builds overrides this to __weak, find the 'strong' version diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c index b271f6e90b91..e69f99a0747d 100644 --- a/drivers/cxl/pmem.c +++ b/drivers/cxl/pmem.c @@ -7,6 +7,7 @@ #include <linux/ndctl.h> #include <linux/async.h> #include <linux/slab.h> +#include <linux/nd.h> #include "cxlmem.h" #include "cxl.h" @@ -27,6 +28,19 @@ static void clear_exclusive(void *cxlds) static void unregister_nvdimm(void *nvdimm) { struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm); + struct cxl_nvdimm_bridge *cxl_nvb = cxl_nvd->bridge; + struct cxl_pmem_region *cxlr_pmem; + + device_lock(&cxl_nvb->dev); + cxlr_pmem = cxl_nvd->region; + dev_set_drvdata(&cxl_nvd->dev, NULL); + cxl_nvd->region = NULL; + device_unlock(&cxl_nvb->dev); + + if (cxlr_pmem) { + device_release_driver(&cxlr_pmem->dev); + put_device(&cxlr_pmem->dev); + } nvdimm_delete(nvdimm); cxl_nvd->bridge = NULL; @@ -42,7 +56,7 @@ static int cxl_nvdimm_probe(struct device *dev) struct nvdimm *nvdimm; int rc; - cxl_nvb = cxl_find_nvdimm_bridge(cxl_nvd); + cxl_nvb = cxl_find_nvdimm_bridge(dev); if (!cxl_nvb) return -ENXIO; @@ -223,6 +237,21 @@ static int cxl_nvdimm_release_driver(struct device *dev, void *cxl_nvb) return 0; } +static int cxl_pmem_region_release_driver(struct device *dev, void *cxl_nvb) +{ + struct cxl_pmem_region *cxlr_pmem; + + if (!is_cxl_pmem_region(dev)) + return 0; + + cxlr_pmem = to_cxl_pmem_region(dev); + if (cxlr_pmem->bridge != cxl_nvb) + return 0; + + device_release_driver(dev); + return 0; +} + static void offline_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb, struct nvdimm_bus *nvdimm_bus) { @@ -235,6 +264,8 @@ static void offline_nvdimm_bus(struct cxl_nvdimm_bridge *cxl_nvb, * underneath them. */ bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb, + cxl_pmem_region_release_driver); + bus_for_each_dev(&cxl_bus_type, NULL, cxl_nvb, cxl_nvdimm_release_driver); nvdimm_bus_unregister(nvdimm_bus); } @@ -328,6 +359,203 @@ static struct cxl_driver cxl_nvdimm_bridge_driver = { .id = CXL_DEVICE_NVDIMM_BRIDGE, }; +static int match_cxl_nvdimm(struct device *dev, void *data) +{ + return is_cxl_nvdimm(dev); +} + +static void unregister_nvdimm_region(void *nd_region) +{ + struct cxl_nvdimm_bridge *cxl_nvb; + struct cxl_pmem_region *cxlr_pmem; + int i; + + cxlr_pmem = nd_region_provider_data(nd_region); + cxl_nvb = cxlr_pmem->bridge; + device_lock(&cxl_nvb->dev); + for (i = 0; i < cxlr_pmem->nr_mappings; i++) { + struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i]; + struct cxl_nvdimm *cxl_nvd = m->cxl_nvd; + + if (cxl_nvd->region) { + put_device(&cxlr_pmem->dev); + cxl_nvd->region = NULL; + } + } + device_unlock(&cxl_nvb->dev); + + nvdimm_region_delete(nd_region); +} + +static void cxlr_pmem_remove_resource(void *res) +{ + remove_resource(res); +} + +struct cxl_pmem_region_info { + u64 offset; + u64 serial; +}; + +static int cxl_pmem_region_probe(struct device *dev) +{ + struct nd_mapping_desc mappings[CXL_DECODER_MAX_INTERLEAVE]; + struct cxl_pmem_region *cxlr_pmem = to_cxl_pmem_region(dev); + struct cxl_region *cxlr = cxlr_pmem->cxlr; + struct cxl_pmem_region_info *info = NULL; + struct cxl_nvdimm_bridge *cxl_nvb; + struct nd_interleave_set *nd_set; + struct nd_region_desc ndr_desc; + struct cxl_nvdimm *cxl_nvd; + struct nvdimm *nvdimm; + struct resource *res; + int rc, i = 0; + + cxl_nvb = cxl_find_nvdimm_bridge(&cxlr_pmem->mapping[0].cxlmd->dev); + if (!cxl_nvb) { + dev_dbg(dev, "bridge not found\n"); + return -ENXIO; + } + cxlr_pmem->bridge = cxl_nvb; + + device_lock(&cxl_nvb->dev); + if (!cxl_nvb->nvdimm_bus) { + dev_dbg(dev, "nvdimm bus not found\n"); + rc = -ENXIO; + goto err; + } + + memset(&mappings, 0, sizeof(mappings)); + memset(&ndr_desc, 0, sizeof(ndr_desc)); + + res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL); + if (!res) { + rc = -ENOMEM; + goto err; + } + + res->name = "Persistent Memory"; + res->start = cxlr_pmem->hpa_range.start; + res->end = cxlr_pmem->hpa_range.end; + res->flags = IORESOURCE_MEM; + res->desc = IORES_DESC_PERSISTENT_MEMORY; + + rc = insert_resource(&iomem_resource, res); + if (rc) + goto err; + + rc = devm_add_action_or_reset(dev, cxlr_pmem_remove_resource, res); + if (rc) + goto err; + + ndr_desc.res = res; + ndr_desc.provider_data = cxlr_pmem; + + ndr_desc.numa_node = memory_add_physaddr_to_nid(res->start); + ndr_desc.target_node = phys_to_target_node(res->start); + if (ndr_desc.target_node == NUMA_NO_NODE) { + ndr_desc.target_node = ndr_desc.numa_node; + dev_dbg(&cxlr->dev, "changing target node from %d to %d", + NUMA_NO_NODE, ndr_desc.target_node); + } + + nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL); + if (!nd_set) { + rc = -ENOMEM; + goto err; + } + + ndr_desc.memregion = cxlr->id; + set_bit(ND_REGION_CXL, &ndr_desc.flags); + set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags); + + info = kmalloc_array(cxlr_pmem->nr_mappings, sizeof(*info), GFP_KERNEL); + if (!info) { + rc = -ENOMEM; + goto err; + } + + for (i = 0; i < cxlr_pmem->nr_mappings; i++) { + struct cxl_pmem_region_mapping *m = &cxlr_pmem->mapping[i]; + struct cxl_memdev *cxlmd = m->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct device *d; + + d = device_find_child(&cxlmd->dev, NULL, match_cxl_nvdimm); + if (!d) { + dev_dbg(dev, "[%d]: %s: no cxl_nvdimm found\n", i, + dev_name(&cxlmd->dev)); + rc = -ENODEV; + goto err; + } + + /* safe to drop ref now with bridge lock held */ + put_device(d); + + cxl_nvd = to_cxl_nvdimm(d); + nvdimm = dev_get_drvdata(&cxl_nvd->dev); + if (!nvdimm) { + dev_dbg(dev, "[%d]: %s: no nvdimm found\n", i, + dev_name(&cxlmd->dev)); + rc = -ENODEV; + goto err; + } + cxl_nvd->region = cxlr_pmem; + get_device(&cxlr_pmem->dev); + m->cxl_nvd = cxl_nvd; + mappings[i] = (struct nd_mapping_desc) { + .nvdimm = nvdimm, + .start = m->start, + .size = m->size, + .position = i, + }; + info[i].offset = m->start; + info[i].serial = cxlds->serial; + } + ndr_desc.num_mappings = cxlr_pmem->nr_mappings; + ndr_desc.mapping = mappings; + + /* + * TODO enable CXL labels which skip the need for 'interleave-set cookie' + */ + nd_set->cookie1 = + nd_fletcher64(info, sizeof(*info) * cxlr_pmem->nr_mappings, 0); + nd_set->cookie2 = nd_set->cookie1; + ndr_desc.nd_set = nd_set; + + cxlr_pmem->nd_region = + nvdimm_pmem_region_create(cxl_nvb->nvdimm_bus, &ndr_desc); + if (IS_ERR(cxlr_pmem->nd_region)) { + rc = PTR_ERR(cxlr_pmem->nd_region); + goto err; + } + + rc = devm_add_action_or_reset(dev, unregister_nvdimm_region, + cxlr_pmem->nd_region); +out: + kfree(info); + device_unlock(&cxl_nvb->dev); + put_device(&cxl_nvb->dev); + + return rc; + +err: + dev_dbg(dev, "failed to create nvdimm region\n"); + for (i--; i >= 0; i--) { + nvdimm = mappings[i].nvdimm; + cxl_nvd = nvdimm_provider_data(nvdimm); + put_device(&cxl_nvd->region->dev); + cxl_nvd->region = NULL; + } + goto out; +} + +static struct cxl_driver cxl_pmem_region_driver = { + .name = "cxl_pmem_region", + .probe = cxl_pmem_region_probe, + .id = CXL_DEVICE_PMEM_REGION, +}; + /* * Return all bridges to the CXL_NVB_NEW state to invalidate any * ->state_work referring to the now destroyed cxl_pmem_wq. @@ -372,8 +600,14 @@ static __init int cxl_pmem_init(void) if (rc) goto err_nvdimm; + rc = cxl_driver_register(&cxl_pmem_region_driver); + if (rc) + goto err_region; + return 0; +err_region: + cxl_driver_unregister(&cxl_nvdimm_driver); err_nvdimm: cxl_driver_unregister(&cxl_nvdimm_bridge_driver); err_bridge: @@ -383,6 +617,7 @@ err_bridge: static __exit void cxl_pmem_exit(void) { + cxl_driver_unregister(&cxl_pmem_region_driver); cxl_driver_unregister(&cxl_nvdimm_driver); cxl_driver_unregister(&cxl_nvdimm_bridge_driver); destroy_cxl_pmem_wq(); @@ -394,3 +629,4 @@ module_exit(cxl_pmem_exit); MODULE_IMPORT_NS(CXL); MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM_BRIDGE); MODULE_ALIAS_CXL(CXL_DEVICE_NVDIMM); +MODULE_ALIAS_CXL(CXL_DEVICE_PMEM_REGION); |