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authorHuang Ying <ying.huang@intel.com>2023-09-26 09:06:28 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-17 01:44:39 +0300
commit6bc2cfdf82d56863b7cf5e86e37a662b2ae5d47e (patch)
tree7475bafbb2e698c79195568c7fc65b25183cd2ab /drivers/dax
parent3718c02dbd4c88d47b5af003acdb3d1112604ea3 (diff)
downloadlinux-6bc2cfdf82d56863b7cf5e86e37a662b2ae5d47e.tar.xz
dax, kmem: calculate abstract distance with general interface
Previously, a fixed abstract distance MEMTIER_DEFAULT_DAX_ADISTANCE is used for slow memory type in kmem driver. This limits the usage of kmem driver, for example, it cannot be used for HBM (high bandwidth memory). So, we use the general abstract distance calculation mechanism in kmem drivers to get more accurate abstract distance on systems with proper support. The original MEMTIER_DEFAULT_DAX_ADISTANCE is used as fallback only. Now, multiple memory types may be managed by kmem. These memory types are put into the "kmem_memory_types" list and protected by kmem_memory_type_lock. Link: https://lkml.kernel.org/r/20230926060628.265989-5-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Tested-by: Bharata B Rao <bharata@amd.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Alistair Popple <apopple@nvidia.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Wei Xu <weixugc@google.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Yang Shi <shy828301@gmail.com> Cc: Rafael J Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/kmem.c62
1 files changed, 49 insertions, 13 deletions
diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index c57acb73e3db..369c698b7706 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -49,14 +49,52 @@ struct dax_kmem_data {
struct resource *res[];
};
-static struct memory_dev_type *dax_slowmem_type;
+static DEFINE_MUTEX(kmem_memory_type_lock);
+static LIST_HEAD(kmem_memory_types);
+
+static struct memory_dev_type *kmem_find_alloc_memory_type(int adist)
+{
+ bool found = false;
+ struct memory_dev_type *mtype;
+
+ mutex_lock(&kmem_memory_type_lock);
+ list_for_each_entry(mtype, &kmem_memory_types, list) {
+ if (mtype->adistance == adist) {
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ mtype = alloc_memory_type(adist);
+ if (!IS_ERR(mtype))
+ list_add(&mtype->list, &kmem_memory_types);
+ }
+ mutex_unlock(&kmem_memory_type_lock);
+
+ return mtype;
+}
+
+static void kmem_put_memory_types(void)
+{
+ struct memory_dev_type *mtype, *mtn;
+
+ mutex_lock(&kmem_memory_type_lock);
+ list_for_each_entry_safe(mtype, mtn, &kmem_memory_types, list) {
+ list_del(&mtype->list);
+ put_memory_type(mtype);
+ }
+ mutex_unlock(&kmem_memory_type_lock);
+}
+
static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
{
struct device *dev = &dev_dax->dev;
unsigned long total_len = 0;
struct dax_kmem_data *data;
+ struct memory_dev_type *mtype;
int i, rc, mapped = 0;
int numa_node;
+ int adist = MEMTIER_DEFAULT_DAX_ADISTANCE;
/*
* Ensure good NUMA information for the persistent memory.
@@ -71,6 +109,11 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
return -EINVAL;
}
+ mt_calc_adistance(numa_node, &adist);
+ mtype = kmem_find_alloc_memory_type(adist);
+ if (IS_ERR(mtype))
+ return PTR_ERR(mtype);
+
for (i = 0; i < dev_dax->nr_range; i++) {
struct range range;
@@ -88,7 +131,7 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
return -EINVAL;
}
- init_node_memory_type(numa_node, dax_slowmem_type);
+ init_node_memory_type(numa_node, mtype);
rc = -ENOMEM;
data = kzalloc(struct_size(data, res, dev_dax->nr_range), GFP_KERNEL);
@@ -167,7 +210,7 @@ err_reg_mgid:
err_res_name:
kfree(data);
err_dax_kmem_data:
- clear_node_memory_type(numa_node, dax_slowmem_type);
+ clear_node_memory_type(numa_node, mtype);
return rc;
}
@@ -219,7 +262,7 @@ static void dev_dax_kmem_remove(struct dev_dax *dev_dax)
* for that. This implies this reference will be around
* till next reboot.
*/
- clear_node_memory_type(node, dax_slowmem_type);
+ clear_node_memory_type(node, NULL);
}
}
#else
@@ -251,12 +294,6 @@ static int __init dax_kmem_init(void)
if (!kmem_name)
return -ENOMEM;
- dax_slowmem_type = alloc_memory_type(MEMTIER_DEFAULT_DAX_ADISTANCE);
- if (IS_ERR(dax_slowmem_type)) {
- rc = PTR_ERR(dax_slowmem_type);
- goto err_dax_slowmem_type;
- }
-
rc = dax_driver_register(&device_dax_kmem_driver);
if (rc)
goto error_dax_driver;
@@ -264,8 +301,7 @@ static int __init dax_kmem_init(void)
return rc;
error_dax_driver:
- put_memory_type(dax_slowmem_type);
-err_dax_slowmem_type:
+ kmem_put_memory_types();
kfree_const(kmem_name);
return rc;
}
@@ -275,7 +311,7 @@ static void __exit dax_kmem_exit(void)
dax_driver_unregister(&device_dax_kmem_driver);
if (!any_hotremove_failed)
kfree_const(kmem_name);
- put_memory_type(dax_slowmem_type);
+ kmem_put_memory_types();
}
MODULE_AUTHOR("Intel Corporation");