diff options
author | Dan Williams <dan.j.williams@intel.com> | 2023-02-10 01:07:07 -0800 |
---|---|---|
committer | Dan Williams <dan.j.williams@intel.com> | 2023-02-10 17:33:34 -0800 |
commit | 7dab174e2e27eeaf10273e597ffbef4f8ea032bb (patch) | |
tree | 5f592cccf1aeba006b7a3a7af94f90091cc555ba /drivers/dax/hmem/device.c | |
parent | fe098574a93b4e2acb046b583e9857337d807f38 (diff) | |
download | linux-stable-7dab174e2e27eeaf10273e597ffbef4f8ea032bb.tar.gz linux-stable-7dab174e2e27eeaf10273e597ffbef4f8ea032bb.tar.bz2 linux-stable-7dab174e2e27eeaf10273e597ffbef4f8ea032bb.zip |
dax/hmem: Move hmem device registration to dax_hmem.ko
In preparation for the CXL region driver to take over the responsibility
of registering device-dax instances for CXL regions, move the
registration of "hmem" devices to dax_hmem.ko.
Previously the builtin component of this enabling
(drivers/dax/hmem/device.o) would register platform devices for each
address range and trigger the dax_hmem.ko module to load and attach
device-dax instances to those devices. Now, the ranges are collected
from the HMAT and EFI memory map walking, but the device creation is
deferred. A new "hmem_platform" device is created which triggers
dax_hmem.ko to load and register the platform devices.
Tested-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/167602002771.1924368.5653558226424530127.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/hmem/device.c')
-rw-r--r-- | drivers/dax/hmem/device.c | 91 |
1 files changed, 44 insertions, 47 deletions
diff --git a/drivers/dax/hmem/device.c b/drivers/dax/hmem/device.c index b1b339bccfe5..f9e1a76a04a9 100644 --- a/drivers/dax/hmem/device.c +++ b/drivers/dax/hmem/device.c @@ -8,6 +8,8 @@ static bool nohmem; module_param_named(disable, nohmem, bool, 0444); +static bool platform_initialized; +static DEFINE_MUTEX(hmem_resource_lock); static struct resource hmem_active = { .name = "HMEM devices", .start = 0, @@ -15,71 +17,66 @@ static struct resource hmem_active = { .flags = IORESOURCE_MEM, }; -void hmem_register_device(int target_nid, struct resource *res) +int walk_hmem_resources(struct device *host, walk_hmem_fn fn) +{ + struct resource *res; + int rc = 0; + + mutex_lock(&hmem_resource_lock); + for (res = hmem_active.child; res; res = res->sibling) { + rc = fn(host, (int) res->desc, res); + if (rc) + break; + } + mutex_unlock(&hmem_resource_lock); + return rc; +} +EXPORT_SYMBOL_GPL(walk_hmem_resources); + +static void __hmem_register_resource(int target_nid, struct resource *res) { struct platform_device *pdev; - struct memregion_info info; - int rc, id; + struct resource *new; + int rc; - if (nohmem) + new = __request_region(&hmem_active, res->start, resource_size(res), "", + 0); + if (!new) { + pr_debug("hmem range %pr already active\n", res); return; + } - rc = region_intersects(res->start, resource_size(res), IORESOURCE_MEM, - IORES_DESC_SOFT_RESERVED); - if (rc != REGION_INTERSECTS) - return; + new->desc = target_nid; - id = memregion_alloc(GFP_KERNEL); - if (id < 0) { - pr_err("memregion allocation failure for %pr\n", res); + if (platform_initialized) return; - } - pdev = platform_device_alloc("hmem", id); + pdev = platform_device_alloc("hmem_platform", 0); if (!pdev) { - pr_err("hmem device allocation failure for %pr\n", res); - goto out_pdev; - } - - 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); - 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; + pr_err_once("failed to register device-dax hmem_platform device\n"); + return; } rc = platform_device_add(pdev); - if (rc < 0) { - dev_err(&pdev->dev, "device add failed for %pr\n", res); - goto out_resource; - } + if (rc) + platform_device_put(pdev); + else + platform_initialized = true; +} - return; +void hmem_register_resource(int target_nid, struct resource *res) +{ + if (nohmem) + return; -out_resource: - __release_region(&hmem_active, res->start, resource_size(res)); -out_active: - platform_device_put(pdev); -out_pdev: - memregion_free(id); + mutex_lock(&hmem_resource_lock); + __hmem_register_resource(target_nid, res); + mutex_unlock(&hmem_resource_lock); } static __init int hmem_register_one(struct resource *res, void *data) { - hmem_register_device(phys_to_target_node(res->start), res); + hmem_register_resource(phys_to_target_node(res->start), res); return 0; } |