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cxl/core: Define a 'struct cxl_root_decoder' 

Previously the target routing specifics of switch decoders were factored
out of 'struct cxl_decoder' into 'struct cxl_switch_decoder'.

This patch, 2 of 3, adds a 'struct cxl_root_decoder' as a superset of a
switch decoder that also track the associated CXL window platform
resource.

Note that the reason the resource for a given root decoder needs to be
looked up after the fact (i.e. after cxl_parse_cfmws() and
add_cxl_resource()) is because add_cxl_resource() may have merged CXL
windows in order to keep them at the top of the resource tree / decode
hierarchy.

Co-developed-by: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165784326541.1758207.9915663937394448341.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2022-07-12 18:38:26 -07:00
parent 974854ab07
commit 0f157c7fa1
3 changed files with 76 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/cxl/acpi.c
View File

@ -84,7 +84,7 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
struct cxl_cfmws_context *ctx = arg;
struct cxl_port *root_port = ctx->root_port;
struct resource *cxl_res = ctx->cxl_res;
struct cxl_switch_decoder *cxlsd;
struct cxl_root_decoder *cxlrd;
struct device *dev = ctx->dev;
struct acpi_cedt_cfmws *cfmws;
struct cxl_decoder *cxld;
@ -128,11 +128,11 @@ static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,
if (rc)
goto err_insert;
cxlsd = cxl_root_decoder_alloc(root_port, ways);
if (IS_ERR(cxld))
cxlrd = cxl_root_decoder_alloc(root_port, ways);
if (IS_ERR(cxlrd))
return 0;
cxld = &cxlsd->cxld;
cxld = &cxlrd->cxlsd.cxld;
cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions);
cxld->target_type = CXL_DECODER_EXPANDER;
cxld->hpa_range = (struct range) {
@ -409,6 +409,32 @@ static int add_cxl_resources(struct resource *cxl_res)
return 0;
}
static int pair_cxl_resource(struct device *dev, void *data)
{
struct resource *cxl_res = data;
struct resource *p;
if (!is_root_decoder(dev))
return 0;
for (p = cxl_res->child; p; p = p->sibling) {
struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld;
struct resource res = {
.start = cxld->hpa_range.start,
.end = cxld->hpa_range.end,
.flags = IORESOURCE_MEM,
};
if (resource_contains(p, &res)) {
cxlrd->res = cxl_get_public_resource(p);
break;
}
}
return 0;
}
static int cxl_acpi_probe(struct platform_device *pdev)
{
int rc;
@ -459,6 +485,12 @@ static int cxl_acpi_probe(struct platform_device *pdev)
if (rc)
return rc;
/*
* Populate the root decoders with their related iomem resource,
* if present
*/
device_for_each_child(&root_port->dev, cxl_res, pair_cxl_resource);
/*
* Root level scanned with host-bridge as dports, now scan host-bridges
* for their role as CXL uports to their CXL-capable PCIe Root Ports.

34
drivers/cxl/core/port.c
View File

@ -260,6 +260,23 @@ static void cxl_switch_decoder_release(struct device *dev)
kfree(cxlsd);
}
struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev)
{
if (dev_WARN_ONCE(dev, !is_root_decoder(dev),
"not a cxl_root_decoder device\n"))
return NULL;
return container_of(dev, struct cxl_root_decoder, cxlsd.cxld.dev);
}
EXPORT_SYMBOL_NS_GPL(to_cxl_root_decoder, CXL);
static void cxl_root_decoder_release(struct device *dev)
{
struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(dev);
__cxl_decoder_release(&cxlrd->cxlsd.cxld);
kfree(cxlrd);
}
static const struct device_type cxl_decoder_endpoint_type = {
.name = "cxl_decoder_endpoint",
.release = cxl_decoder_release,
@ -274,7 +291,7 @@ static const struct device_type cxl_decoder_switch_type = {
static const struct device_type cxl_decoder_root_type = {
.name = "cxl_decoder_root",
.release = cxl_switch_decoder_release,
.release = cxl_root_decoder_release,
.groups = cxl_decoder_root_attribute_groups,
};
@ -1271,9 +1288,10 @@ static int cxl_switch_decoder_init(struct cxl_port *port,
* firmware description of CXL resources into a CXL standard decode
* topology.
*/
struct cxl_switch_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
unsigned int nr_targets)
struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
unsigned int nr_targets)
{
struct cxl_root_decoder *cxlrd;
struct cxl_switch_decoder *cxlsd;
struct cxl_decoder *cxld;
int rc;
@ -1281,19 +1299,21 @@ struct cxl_switch_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
if (!is_cxl_root(port))
return ERR_PTR(-EINVAL);
cxlsd = kzalloc(struct_size(cxlsd, target, nr_targets), GFP_KERNEL);
if (!cxlsd)
cxlrd = kzalloc(struct_size(cxlrd, cxlsd.target, nr_targets),
GFP_KERNEL);
if (!cxlrd)
return ERR_PTR(-ENOMEM);
cxlsd = &cxlrd->cxlsd;
rc = cxl_switch_decoder_init(port, cxlsd, nr_targets);
if (rc) {
kfree(cxlsd);
kfree(cxlrd);
return ERR_PTR(rc);
}
cxld = &cxlsd->cxld;
cxld->dev.type = &cxl_decoder_root_type;
return cxlsd;
return cxlrd;
}
EXPORT_SYMBOL_NS_GPL(cxl_root_decoder_alloc, CXL);

15
drivers/cxl/cxl.h
View File

@ -260,6 +260,16 @@ struct cxl_switch_decoder {
};
/**
* struct cxl_root_decoder - Static platform CXL address decoder
* @res: host / parent resource for region allocations
* @cxlsd: base cxl switch decoder
*/
struct cxl_root_decoder {
struct resource *res;
struct cxl_switch_decoder cxlsd;
};
/**
* enum cxl_nvdimm_brige_state - state machine for managing bus rescans
* @CXL_NVB_NEW: Set at bridge create and after cxl_pmem_wq is destroyed
@ -383,10 +393,11 @@ struct cxl_dport *cxl_find_dport_by_dev(struct cxl_port *port,
const struct device *dev);
struct cxl_decoder *to_cxl_decoder(struct device *dev);
struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
bool is_root_decoder(struct device *dev);
bool is_endpoint_decoder(struct device *dev);
struct cxl_switch_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
unsigned int nr_targets);
struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
unsigned int nr_targets);
struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
unsigned int nr_targets);
int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);