libnvdimm, nfit: remove nfit_spa_map() infrastructure

Now that all shared mappings are handled by devm_nvdimm_memremap() we no
longer need nfit_spa_map() nor do we need to trigger a callback to the
bus provider at region disable time.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
index b047dbe..b76c959 100644 (file)
--- a/drivers/acpi/nfit.c
+++ b/drivers/acpi/nfit.c
@@ -1509,126 +1509,6 @@ static int acpi_nfit_blk_region_do_io(struct nd_blk_region *ndbr,
        return rc;
 }
 
-static void nfit_spa_mapping_release(struct kref *kref)
-{
-       struct nfit_spa_mapping *spa_map = to_spa_map(kref);
-       struct acpi_nfit_system_address *spa = spa_map->spa;
-       struct acpi_nfit_desc *acpi_desc = spa_map->acpi_desc;
-
-       WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
-       dev_dbg(acpi_desc->dev, "%s: SPA%d\n", __func__, spa->range_index);
-       if (spa_map->type == SPA_MAP_APERTURE)
-               memunmap((void __force *)spa_map->addr.aperture);
-       else
-               iounmap(spa_map->addr.base);
-       release_mem_region(spa->address, spa->length);
-       list_del(&spa_map->list);
-       kfree(spa_map);
-}
-
-static struct nfit_spa_mapping *find_spa_mapping(
-               struct acpi_nfit_desc *acpi_desc,
-               struct acpi_nfit_system_address *spa)
-{
-       struct nfit_spa_mapping *spa_map;
-
-       WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
-       list_for_each_entry(spa_map, &acpi_desc->spa_maps, list)
-               if (spa_map->spa == spa)
-                       return spa_map;
-
-       return NULL;
-}
-
-static void nfit_spa_unmap(struct acpi_nfit_desc *acpi_desc,
-               struct acpi_nfit_system_address *spa)
-{
-       struct nfit_spa_mapping *spa_map;
-
-       mutex_lock(&acpi_desc->spa_map_mutex);
-       spa_map = find_spa_mapping(acpi_desc, spa);
-
-       if (spa_map)
-               kref_put(&spa_map->kref, nfit_spa_mapping_release);
-       mutex_unlock(&acpi_desc->spa_map_mutex);
-}
-
-static void __iomem *__nfit_spa_map(struct acpi_nfit_desc *acpi_desc,
-               struct acpi_nfit_system_address *spa, enum spa_map_type type)
-{
-       resource_size_t start = spa->address;
-       resource_size_t n = spa->length;
-       struct nfit_spa_mapping *spa_map;
-       struct resource *res;
-
-       WARN_ON(!mutex_is_locked(&acpi_desc->spa_map_mutex));
-
-       spa_map = find_spa_mapping(acpi_desc, spa);
-       if (spa_map) {
-               kref_get(&spa_map->kref);
-               return spa_map->addr.base;
-       }
-
-       spa_map = kzalloc(sizeof(*spa_map), GFP_KERNEL);
-       if (!spa_map)
-               return NULL;
-
-       INIT_LIST_HEAD(&spa_map->list);
-       spa_map->spa = spa;
-       kref_init(&spa_map->kref);
-       spa_map->acpi_desc = acpi_desc;
-
-       res = request_mem_region(start, n, dev_name(acpi_desc->dev));
-       if (!res)
-               goto err_mem;
-
-       spa_map->type = type;
-       if (type == SPA_MAP_APERTURE)
-               spa_map->addr.aperture = (void __pmem *)memremap(start, n,
-                                                       ARCH_MEMREMAP_PMEM);
-       else
-               spa_map->addr.base = ioremap_nocache(start, n);
-
-
-       if (!spa_map->addr.base)
-               goto err_map;
-
-       list_add_tail(&spa_map->list, &acpi_desc->spa_maps);
-       return spa_map->addr.base;
-
- err_map:
-       release_mem_region(start, n);
- err_mem:
-       kfree(spa_map);
-       return NULL;
-}
-
-/**
- * nfit_spa_map - interleave-aware managed-mappings of acpi_nfit_system_address ranges
- * @nvdimm_bus: NFIT-bus that provided the spa table entry
- * @nfit_spa: spa table to map
- * @type: aperture or control region
- *
- * In the case where block-data-window apertures and
- * dimm-control-regions are interleaved they will end up sharing a
- * single request_mem_region() + ioremap() for the address range.  In
- * the style of devm nfit_spa_map() mappings are automatically dropped
- * when all region devices referencing the same mapping are disabled /
- * unbound.
- */
-static __maybe_unused void __iomem *nfit_spa_map(
-               struct acpi_nfit_desc *acpi_desc,
-               struct acpi_nfit_system_address *spa, enum spa_map_type type)
-{
-       void __iomem *iomem;
-
-       mutex_lock(&acpi_desc->spa_map_mutex);
-       iomem = __nfit_spa_map(acpi_desc, spa, type);
-       mutex_unlock(&acpi_desc->spa_map_mutex);
-
-       return iomem;
-}
-
 static int nfit_blk_init_interleave(struct nfit_blk_mmio *mmio,
                struct acpi_nfit_interleave *idt, u16 interleave_ways)
 {
@@ -1773,29 +1653,6 @@ static int acpi_nfit_blk_region_enable(struct nvdimm_bus *nvdimm_bus,
        return 0;
 }
 
-static void acpi_nfit_blk_region_disable(struct nvdimm_bus *nvdimm_bus,
-               struct device *dev)
-{
-       struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
-       struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
-       struct nd_blk_region *ndbr = to_nd_blk_region(dev);
-       struct nfit_blk *nfit_blk = nd_blk_region_provider_data(ndbr);
-       int i;
-
-       if (!nfit_blk)
-               return; /* never enabled */
-
-       /* auto-free BLK spa mappings */
-       for (i = 0; i < 2; i++) {
-               struct nfit_blk_mmio *mmio = &nfit_blk->mmio[i];
-
-               if (mmio->addr.base)
-                       nfit_spa_unmap(acpi_desc, mmio->spa);
-       }
-       nd_blk_region_set_provider_data(ndbr, NULL);
-       /* devm will free nfit_blk */
-}
-
 static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
                struct nd_cmd_ars_cap *cmd, struct nfit_spa *nfit_spa)
 {
@@ -1969,7 +1826,6 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc *acpi_desc,
                ndr_desc->num_mappings = blk_valid;
                ndbr_desc = to_blk_region_desc(ndr_desc);
                ndbr_desc->enable = acpi_nfit_blk_region_enable;
-               ndbr_desc->disable = acpi_nfit_blk_region_disable;
                ndbr_desc->do_io = acpi_desc->blk_do_io;
                nfit_spa->nd_region = nvdimm_blk_region_create(acpi_desc->nvdimm_bus,
                                ndr_desc);
@@ -2509,7 +2365,6 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
        nd_desc->clear_to_send = acpi_nfit_clear_to_send;
        nd_desc->attr_groups = acpi_nfit_attribute_groups;
 
-       INIT_LIST_HEAD(&acpi_desc->spa_maps);
        INIT_LIST_HEAD(&acpi_desc->spas);
        INIT_LIST_HEAD(&acpi_desc->dcrs);
        INIT_LIST_HEAD(&acpi_desc->bdws);
@@ -2517,7 +2372,6 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev)
        INIT_LIST_HEAD(&acpi_desc->flushes);
        INIT_LIST_HEAD(&acpi_desc->memdevs);
        INIT_LIST_HEAD(&acpi_desc->dimms);
-       mutex_init(&acpi_desc->spa_map_mutex);
        mutex_init(&acpi_desc->init_mutex);
        INIT_WORK(&acpi_desc->work, acpi_nfit_scrub);
 }

diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index f06fa91..5207847 100644 (file)
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -135,9 +135,7 @@ struct acpi_nfit_desc {
        struct nvdimm_bus_descriptor nd_desc;
        struct acpi_table_header acpi_header;
        struct acpi_nfit_header *nfit;
-       struct mutex spa_map_mutex;
        struct mutex init_mutex;
-       struct list_head spa_maps;
        struct list_head memdevs;
        struct list_head flushes;
        struct list_head dimms;
@@ -188,25 +186,6 @@ struct nfit_blk {
        u32 dimm_flags;
 };
 
-enum spa_map_type {
-       SPA_MAP_CONTROL,
-       SPA_MAP_APERTURE,
-};
-
-struct nfit_spa_mapping {
-       struct acpi_nfit_desc *acpi_desc;
-       struct acpi_nfit_system_address *spa;
-       struct list_head list;
-       struct kref kref;
-       enum spa_map_type type;
-       struct nd_blk_addr addr;
-};
-
-static inline struct nfit_spa_mapping *to_spa_map(struct kref *kref)
-{
-       return container_of(kref, struct nfit_spa_mapping, kref);
-}
-
 static inline struct acpi_nfit_memory_map *__to_nfit_memdev(
                struct nfit_mem *nfit_mem)
 {

diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index d0ac93c..2819e88 100644 (file)
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -119,7 +119,6 @@ struct nd_region {
 
 struct nd_blk_region {
        int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
-       void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
        int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
                        void *iobuf, u64 len, int rw);
        void *blk_provider_data;

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 40fcfea..694b210 100644 (file)
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -433,8 +433,6 @@ static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
 
                if (is_nd_pmem(dev))
                        return;
-
-               to_nd_blk_region(dev)->disable(nvdimm_bus, dev);
        }
        if (dev->parent && is_nd_blk(dev->parent) && probe) {
                nd_region = to_nd_region(dev->parent);
@@ -698,7 +696,6 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
                if (ndbr) {
                        nd_region = &ndbr->nd_region;
                        ndbr->enable = ndbr_desc->enable;
-                       ndbr->disable = ndbr_desc->disable;
                        ndbr->do_io = ndbr_desc->do_io;
                }
                region_buf = ndbr;

diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index 18c3cc4..1050f9a 100644 (file)
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -114,7 +114,6 @@ struct device;
 struct nd_blk_region;
 struct nd_blk_region_desc {
        int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
-       void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
        int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
                        void *iobuf, u64 len, int rw);
        struct nd_region_desc ndr_desc;