diff options
Diffstat (limited to 'drivers/cxl/core/port.c')
| -rw-r--r-- | drivers/cxl/core/port.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 60c637a826a2..9a768822261b 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2020 Intel Corporation. All rights reserved. */ #include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/memregion.h> #include <linux/workqueue.h> #include <linux/debugfs.h> #include <linux/device.h> @@ -300,11 +301,35 @@ static struct attribute *cxl_decoder_root_attrs[] = { &dev_attr_cap_type2.attr, &dev_attr_cap_type3.attr, &dev_attr_target_list.attr, + SET_CXL_REGION_ATTR(create_pmem_region) + SET_CXL_REGION_ATTR(delete_region) NULL, }; +static bool can_create_pmem(struct cxl_root_decoder *cxlrd) +{ + unsigned long flags = CXL_DECODER_F_TYPE3 | CXL_DECODER_F_PMEM; + + return (cxlrd->cxlsd.cxld.flags & flags) == flags; +} + +static umode_t cxl_root_decoder_visible(struct kobject *kobj, struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev); + + if (a == CXL_REGION_ATTR(create_pmem_region) && !can_create_pmem(cxlrd)) + return 0; + + if (a == CXL_REGION_ATTR(delete_region) && !can_create_pmem(cxlrd)) + return 0; + + return a->mode; +} + static struct attribute_group cxl_decoder_root_attribute_group = { .attrs = cxl_decoder_root_attrs, + .is_visible = cxl_root_decoder_visible, }; static const struct attribute_group *cxl_decoder_root_attribute_groups[] = { @@ -387,6 +412,8 @@ static void cxl_root_decoder_release(struct device *dev) { struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev); + if (atomic_read(&cxlrd->region_id) >= 0) + memregion_free(atomic_read(&cxlrd->region_id)); __cxl_decoder_release(&cxlrd->cxlsd.cxld); kfree(cxlrd); } @@ -1484,6 +1511,18 @@ struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port, cxld = &cxlsd->cxld; cxld->dev.type = &cxl_decoder_root_type; + /* + * cxl_root_decoder_release() special cases negative ids to + * detect memregion_alloc() failures. + */ + atomic_set(&cxlrd->region_id, -1); + rc = memregion_alloc(GFP_KERNEL); + if (rc < 0) { + put_device(&cxld->dev); + return ERR_PTR(rc); + } + + atomic_set(&cxlrd->region_id, rc); return cxlrd; } EXPORT_SYMBOL_NS_GPL(cxl_root_decoder_alloc, CXL); |