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cxl/pci: Store component register base in cxlds

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In preparation for defining a cxl_port object to represent the decoder
resources of a memory expander capture the component register base
address.

The port driver uses the component register base to enumerate the HDM
Decoder Capability structure. Unlike other cxl_port objects the endpoint
port decodes from upstream SPA to downstream DPA rather than upstream
port to downstream port.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[djbw: clarify changelog]
Link: https://lore.kernel.org/r/164375084181.484304.3919737667590006795.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ben Widawsky 2022-02-01 13:28:53 -08:00 committed by Dan Williams
parent 664bf11583
commit 4112a08dd3
2 changed files with 14 additions and 0 deletions
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3
drivers/cxl/cxlmem.h
View File

@ -116,6 +116,7 @@ struct cxl_mbox_cmd {
* @active_persistent_bytes: sum of hard + soft persistent
* @next_volatile_bytes: volatile capacity change pending device reset
* @next_persistent_bytes: persistent capacity change pending device reset
* @component_reg_phys: register base of component registers
* @mbox_send: @dev specific transport for transmitting mailbox commands
*
* See section 8.2.9.5.2 Capacity Configuration and Label Storage for
@ -145,6 +146,8 @@ struct cxl_dev_state {
u64 next_volatile_bytes;
u64 next_persistent_bytes;
resource_size_t component_reg_phys;
int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd);
};

11
drivers/cxl/pci.c
View File

@ -416,6 +416,17 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (rc)
return rc;
/*
* If the component registers can't be found, the cxl_pci driver may
* still be useful for management functions so don't return an error.
*/
cxlds->component_reg_phys = CXL_RESOURCE_NONE;
rc = cxl_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
if (rc)
dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
cxlds->component_reg_phys = cxl_regmap_to_base(pdev, &map);
rc = cxl_pci_setup_mailbox(cxlds);
if (rc)
return rc;