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authorDan Williams <dan.j.williams@intel.com>2023-02-10 01:07:02 -0800
committerDan Williams <dan.j.williams@intel.com>2023-02-10 17:33:29 -0800
commitfe098574a93b4e2acb046b583e9857337d807f38 (patch)
treef88ac30cc5e55eec7c07c8b39d7a877ef13ca9ac /drivers/dax
parent84fe17f8e9c68a4389c6e89b7ce3b4651b359989 (diff)
dax/hmem: Convey the dax range via memregion_info()
In preparation for hmem platform devices to be unregistered, stop using platform_device_add_resources() to convey the address range. The platform_device_add_resources() API causes an existing "Soft Reserved" iomem resource to be re-parented under an inserted platform device resource. When that platform device is deleted it removes the platform device resource and all children. Instead, it is sufficient to convey just the address range and let request_mem_region() insert resources to indicate the devices active in the range. This allows the "Soft Reserved" resource to be re-enumerated upon the next probe event. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Fan Ni <fan.ni@samsung.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/167602002217.1924368.7036275892522551624.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/hmem/device.c37
-rw-r--r--drivers/dax/hmem/hmem.c14
2 files changed, 17 insertions, 34 deletions
diff --git a/drivers/dax/hmem/device.c b/drivers/dax/hmem/device.c
index 20749c7fab81..b1b339bccfe5 100644
--- a/drivers/dax/hmem/device.c
+++ b/drivers/dax/hmem/device.c
@@ -15,15 +15,8 @@ static struct resource hmem_active = {
.flags = IORESOURCE_MEM,
};
-void hmem_register_device(int target_nid, struct resource *r)
+void hmem_register_device(int target_nid, struct resource *res)
{
- /* define a clean / non-busy resource for the platform device */
- struct resource res = {
- .start = r->start,
- .end = r->end,
- .flags = IORESOURCE_MEM,
- .desc = IORES_DESC_SOFT_RESERVED,
- };
struct platform_device *pdev;
struct memregion_info info;
int rc, id;
@@ -31,55 +24,53 @@ void hmem_register_device(int target_nid, struct resource *r)
if (nohmem)
return;
- rc = region_intersects(res.start, resource_size(&res), IORESOURCE_MEM,
- IORES_DESC_SOFT_RESERVED);
+ rc = region_intersects(res->start, resource_size(res), IORESOURCE_MEM,
+ IORES_DESC_SOFT_RESERVED);
if (rc != REGION_INTERSECTS)
return;
id = memregion_alloc(GFP_KERNEL);
if (id < 0) {
- pr_err("memregion allocation failure for %pr\n", &res);
+ pr_err("memregion allocation failure for %pr\n", res);
return;
}
pdev = platform_device_alloc("hmem", id);
if (!pdev) {
- pr_err("hmem device allocation failure for %pr\n", &res);
+ pr_err("hmem device allocation failure for %pr\n", res);
goto out_pdev;
}
- if (!__request_region(&hmem_active, res.start, resource_size(&res),
+ if (!__request_region(&hmem_active, res->start, resource_size(res),
dev_name(&pdev->dev), 0)) {
- dev_dbg(&pdev->dev, "hmem range %pr already active\n", &res);
+ dev_dbg(&pdev->dev, "hmem range %pr already active\n", res);
goto out_active;
}
pdev->dev.numa_node = numa_map_to_online_node(target_nid);
info = (struct memregion_info) {
.target_node = target_nid,
+ .range = {
+ .start = res->start,
+ .end = res->end,
+ },
};
rc = platform_device_add_data(pdev, &info, sizeof(info));
if (rc < 0) {
- pr_err("hmem memregion_info allocation failure for %pr\n", &res);
- goto out_resource;
- }
-
- rc = platform_device_add_resources(pdev, &res, 1);
- if (rc < 0) {
- pr_err("hmem resource allocation failure for %pr\n", &res);
+ pr_err("hmem memregion_info allocation failure for %pr\n", res);
goto out_resource;
}
rc = platform_device_add(pdev);
if (rc < 0) {
- dev_err(&pdev->dev, "device add failed for %pr\n", &res);
+ dev_err(&pdev->dev, "device add failed for %pr\n", res);
goto out_resource;
}
return;
out_resource:
- __release_region(&hmem_active, res.start, resource_size(&res));
+ __release_region(&hmem_active, res->start, resource_size(res));
out_active:
platform_device_put(pdev);
out_pdev:
diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
index c7351e0dc8ff..5025a8c9850b 100644
--- a/drivers/dax/hmem/hmem.c
+++ b/drivers/dax/hmem/hmem.c
@@ -15,25 +15,17 @@ static int dax_hmem_probe(struct platform_device *pdev)
struct memregion_info *mri;
struct dev_dax_data data;
struct dev_dax *dev_dax;
- struct resource *res;
- struct range range;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENOMEM;
mri = dev->platform_data;
- range.start = res->start;
- range.end = res->end;
- dax_region = alloc_dax_region(dev, pdev->id, &range, mri->target_node,
- PMD_SIZE, 0);
+ dax_region = alloc_dax_region(dev, pdev->id, &mri->range,
+ mri->target_node, PMD_SIZE, 0);
if (!dax_region)
return -ENOMEM;
data = (struct dev_dax_data) {
.dax_region = dax_region,
.id = -1,
- .size = region_idle ? 0 : resource_size(res),
+ .size = region_idle ? 0 : range_len(&mri->range),
};
dev_dax = devm_create_dev_dax(&data);
if (IS_ERR(dev_dax))