Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index 1e678bd..b4368c5 100644
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -14,17 +14,39 @@
#include "dax-private.h"
#include "bus.h"
-int dev_dax_kmem_probe(struct device *dev)
+/* Memory resource name used for add_memory_driver_managed(). */
+static const char *kmem_name;
+/* Set if any memory will remain added when the driver will be unloaded. */
+static bool any_hotremove_failed;
+
+static int dax_kmem_range(struct dev_dax *dev_dax, int i, struct range *r)
{
- struct dev_dax *dev_dax = to_dev_dax(dev);
- struct resource *res = &dev_dax->region->res;
- resource_size_t kmem_start;
- resource_size_t kmem_size;
- resource_size_t kmem_end;
- struct resource *new_res;
- const char *new_res_name;
+ struct dev_dax_range *dax_range = &dev_dax->ranges[i];
+ struct range *range = &dax_range->range;
+
+ /* memory-block align the hotplug range */
+ r->start = ALIGN(range->start, memory_block_size_bytes());
+ r->end = ALIGN_DOWN(range->end + 1, memory_block_size_bytes()) - 1;
+ if (r->start >= r->end) {
+ r->start = range->start;
+ r->end = range->end;
+ return -ENOSPC;
+ }
+ return 0;
+}
+
+struct dax_kmem_data {
+ const char *res_name;
+ struct resource *res[];
+};
+
+static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
+{
+ struct device *dev = &dev_dax->dev;
+ struct dax_kmem_data *data;
+ int rc = -ENOMEM;
+ int i, mapped = 0;
int numa_node;
- int rc;
/*
* Ensure good NUMA information for the persistent memory.
@@ -34,63 +56,91 @@
*/
numa_node = dev_dax->target_node;
if (numa_node < 0) {
- dev_warn(dev, "rejecting DAX region %pR with invalid node: %d\n",
- res, numa_node);
+ dev_warn(dev, "rejecting DAX region with invalid node: %d\n",
+ numa_node);
return -EINVAL;
}
- /* Hotplug starting at the beginning of the next block: */
- kmem_start = ALIGN(res->start, memory_block_size_bytes());
-
- kmem_size = resource_size(res);
- /* Adjust the size down to compensate for moving up kmem_start: */
- kmem_size -= kmem_start - res->start;
- /* Align the size down to cover only complete blocks: */
- kmem_size &= ~(memory_block_size_bytes() - 1);
- kmem_end = kmem_start + kmem_size;
-
- new_res_name = kstrdup(dev_name(dev), GFP_KERNEL);
- if (!new_res_name)
+ data = kzalloc(sizeof(*data) + sizeof(struct resource *) * dev_dax->nr_range, GFP_KERNEL);
+ if (!data)
return -ENOMEM;
- /* Region is permanently reserved if hotremove fails. */
- new_res = request_mem_region(kmem_start, kmem_size, new_res_name);
- if (!new_res) {
- dev_warn(dev, "could not reserve region [%pa-%pa]\n",
- &kmem_start, &kmem_end);
- kfree(new_res_name);
- return -EBUSY;
+ data->res_name = kstrdup(dev_name(dev), GFP_KERNEL);
+ if (!data->res_name)
+ goto err_res_name;
+
+ for (i = 0; i < dev_dax->nr_range; i++) {
+ struct resource *res;
+ struct range range;
+
+ rc = dax_kmem_range(dev_dax, i, &range);
+ if (rc) {
+ dev_info(dev, "mapping%d: %#llx-%#llx too small after alignment\n",
+ i, range.start, range.end);
+ continue;
+ }
+
+ /* Region is permanently reserved if hotremove fails. */
+ res = request_mem_region(range.start, range_len(&range), data->res_name);
+ if (!res) {
+ dev_warn(dev, "mapping%d: %#llx-%#llx could not reserve region\n",
+ i, range.start, range.end);
+ /*
+ * Once some memory has been onlined we can't
+ * assume that it can be un-onlined safely.
+ */
+ if (mapped)
+ continue;
+ rc = -EBUSY;
+ goto err_request_mem;
+ }
+ data->res[i] = res;
+
+ /*
+ * Set flags appropriate for System RAM. Leave ..._BUSY clear
+ * so that add_memory() can add a child resource. Do not
+ * inherit flags from the parent since it may set new flags
+ * unknown to us that will break add_memory() below.
+ */
+ res->flags = IORESOURCE_SYSTEM_RAM;
+
+ /*
+ * Ensure that future kexec'd kernels will not treat
+ * this as RAM automatically.
+ */
+ rc = add_memory_driver_managed(numa_node, range.start,
+ range_len(&range), kmem_name, MHP_NONE);
+
+ if (rc) {
+ dev_warn(dev, "mapping%d: %#llx-%#llx memory add failed\n",
+ i, range.start, range.end);
+ release_resource(res);
+ kfree(res);
+ data->res[i] = NULL;
+ if (mapped)
+ continue;
+ goto err_request_mem;
+ }
+ mapped++;
}
- /*
- * Set flags appropriate for System RAM. Leave ..._BUSY clear
- * so that add_memory() can add a child resource. Do not
- * inherit flags from the parent since it may set new flags
- * unknown to us that will break add_memory() below.
- */
- new_res->flags = IORESOURCE_SYSTEM_RAM;
-
- rc = add_memory(numa_node, new_res->start, resource_size(new_res));
- if (rc) {
- release_resource(new_res);
- kfree(new_res);
- kfree(new_res_name);
- return rc;
- }
- dev_dax->dax_kmem_res = new_res;
+ dev_set_drvdata(dev, data);
return 0;
+
+err_request_mem:
+ kfree(data->res_name);
+err_res_name:
+ kfree(data);
+ return rc;
}
#ifdef CONFIG_MEMORY_HOTREMOVE
-static int dev_dax_kmem_remove(struct device *dev)
+static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
{
- struct dev_dax *dev_dax = to_dev_dax(dev);
- struct resource *res = dev_dax->dax_kmem_res;
- resource_size_t kmem_start = res->start;
- resource_size_t kmem_size = resource_size(res);
- const char *res_name = res->name;
- int rc;
+ int i, success = 0;
+ struct device *dev = &dev_dax->dev;
+ struct dax_kmem_data *data = dev_get_drvdata(dev);
/*
* We have one shot for removing memory, if some memory blocks were not
@@ -98,24 +148,39 @@
* there is no way to hotremove this memory until reboot because device
* unbind will succeed even if we return failure.
*/
- rc = remove_memory(dev_dax->target_node, kmem_start, kmem_size);
- if (rc) {
+ for (i = 0; i < dev_dax->nr_range; i++) {
+ struct range range;
+ int rc;
+
+ rc = dax_kmem_range(dev_dax, i, &range);
+ if (rc)
+ continue;
+
+ rc = remove_memory(dev_dax->target_node, range.start,
+ range_len(&range));
+ if (rc == 0) {
+ release_resource(data->res[i]);
+ kfree(data->res[i]);
+ data->res[i] = NULL;
+ success++;
+ continue;
+ }
+ any_hotremove_failed = true;
dev_err(dev,
- "DAX region %pR cannot be hotremoved until the next reboot\n",
- res);
- return rc;
+ "mapping%d: %#llx-%#llx cannot be hotremoved until the next reboot\n",
+ i, range.start, range.end);
}
- /* Release and free dax resources */
- release_resource(res);
- kfree(res);
- kfree(res_name);
- dev_dax->dax_kmem_res = NULL;
+ if (success >= dev_dax->nr_range) {
+ kfree(data->res_name);
+ kfree(data);
+ dev_set_drvdata(dev, NULL);
+ }
return 0;
}
#else
-static int dev_dax_kmem_remove(struct device *dev)
+static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
{
/*
* Without hotremove purposely leak the request_mem_region() for the
@@ -124,25 +189,36 @@
* permanently pinned as reserved by the unreleased
* request_mem_region().
*/
+ any_hotremove_failed = true;
return 0;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
static struct dax_device_driver device_dax_kmem_driver = {
- .drv = {
- .probe = dev_dax_kmem_probe,
- .remove = dev_dax_kmem_remove,
- },
+ .probe = dev_dax_kmem_probe,
+ .remove = dev_dax_kmem_remove,
};
static int __init dax_kmem_init(void)
{
- return dax_driver_register(&device_dax_kmem_driver);
+ int rc;
+
+ /* Resource name is permanently allocated if any hotremove fails. */
+ kmem_name = kstrdup_const("System RAM (kmem)", GFP_KERNEL);
+ if (!kmem_name)
+ return -ENOMEM;
+
+ rc = dax_driver_register(&device_dax_kmem_driver);
+ if (rc)
+ kfree_const(kmem_name);
+ return rc;
}
static void __exit dax_kmem_exit(void)
{
dax_driver_unregister(&device_dax_kmem_driver);
+ if (!any_hotremove_failed)
+ kfree_const(kmem_name);
}
MODULE_AUTHOR("Intel Corporation");