Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 22:51:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

cxl/hdm: Emulate HDM decoder from DVSEC range registers

Browse Source 
In the case where HDM decoder register block exists but is not programmed
and at the same time the DVSEC range register range is active, populate the
CXL decoder object 'cxl_decoder' with info from DVSEC range registers.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167640368454.935665.13806415120298330717.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2023-02-14 11:41:24 -08:00 committed by Dan Williams
parent 9de321e93c
commit b777e9bec9
7 changed files with 45 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/cxl/core/hdm.c
View File

@ -679,9 +679,34 @@ static int cxl_decoder_reset(struct cxl_decoder *cxld)
return 0;
}
static int cxl_setup_hdm_decoder_from_dvsec(struct cxl_port *port,
struct cxl_decoder *cxld, int which,
struct cxl_endpoint_dvsec_info *info)
{
if (!is_cxl_endpoint(port))
return -EOPNOTSUPP;
if (!range_len(&info->dvsec_range[which]))
return -ENOENT;
cxld->target_type = CXL_DECODER_EXPANDER;
cxld->commit = NULL;
cxld->reset = NULL;
cxld->hpa_range = info->dvsec_range[which];
/*
* Set the emulated decoder as locked pending additional support to
* change the range registers at run time.
*/
cxld->flags |= CXL_DECODER_F_ENABLE | CXL_DECODER_F_LOCK;
port->commit_end = cxld->id;
return 0;
}
static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
int *target_map, void __iomem *hdm, int which,
u64 *dpa_base)
u64 *dpa_base, struct cxl_endpoint_dvsec_info *info)
{
struct cxl_endpoint_decoder *cxled = NULL;
u64 size, base, skip, dpa_size;
@ -717,6 +742,9 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
.end = base + size - 1,
};
if (cxled && !committed && range_len(&info->dvsec_range[which]))
return cxl_setup_hdm_decoder_from_dvsec(port, cxld, which, info);
/* decoders are enabled if committed */
if (committed) {
cxld->flags |= CXL_DECODER_F_ENABLE;
@ -790,7 +818,8 @@ static int init_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
* devm_cxl_enumerate_decoders - add decoder objects per HDM register set
* @cxlhdm: Structure to populate with HDM capabilities
*/
int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
struct cxl_endpoint_dvsec_info *info)
{
void __iomem *hdm = cxlhdm->regs.hdm_decoder;
struct cxl_port *port = cxlhdm->port;
@ -842,7 +871,8 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
cxld = &cxlsd->cxld;
}
rc = init_hdm_decoder(port, cxld, target_map, hdm, i, &dpa_base);
rc = init_hdm_decoder(port, cxld, target_map, hdm, i,
&dpa_base, info);
if (rc) {
put_device(&cxld->dev);
return rc;

2
drivers/cxl/core/pci.c
View File

@ -426,7 +426,7 @@ int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
* Decoder Capability Enable.
*/
if (info->mem_enabled)
return -EBUSY;
return 0;
rc = devm_cxl_enable_hdm(&port->dev, cxlhdm);
if (rc)

3
drivers/cxl/cxl.h
View File

@ -644,7 +644,8 @@ struct cxl_endpoint_dvsec_info {
struct cxl_hdm;
struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port);
int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm);
int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
struct cxl_endpoint_dvsec_info *info);
int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
int cxl_dvsec_rr_decode(struct device *dev, int dvsec,
struct cxl_endpoint_dvsec_info *info);

2
drivers/cxl/port.c
View File

@ -78,7 +78,7 @@ static int cxl_port_probe(struct device *dev)
}
}
rc = devm_cxl_enumerate_decoders(cxlhdm);
rc = devm_cxl_enumerate_decoders(cxlhdm, &info);
if (rc) {
dev_err(dev, "Couldn't enumerate decoders (%d)\n", rc);
return rc;

3
tools/testing/cxl/test/cxl.c
View File

@ -701,7 +701,8 @@ static int mock_decoder_reset(struct cxl_decoder *cxld)
return 0;
}
static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
struct cxl_endpoint_dvsec_info *info)
{
struct cxl_port *port = cxlhdm->port;
struct cxl_port *parent_port = to_cxl_port(port->dev.parent);

7
tools/testing/cxl/test/mock.c
View File

@ -162,16 +162,17 @@ int __wrap_devm_cxl_add_passthrough_decoder(struct cxl_port *port)
}
EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_add_passthrough_decoder, CXL);
int __wrap_devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
int __wrap_devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
struct cxl_endpoint_dvsec_info *info)
{
int rc, index;
struct cxl_port *port = cxlhdm->port;
struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
if (ops && ops->is_mock_port(port->uport))
rc = ops->devm_cxl_enumerate_decoders(cxlhdm);
rc = ops->devm_cxl_enumerate_decoders(cxlhdm, info);
else
rc = devm_cxl_enumerate_decoders(cxlhdm);
rc = devm_cxl_enumerate_decoders(cxlhdm, info);
put_cxl_mock_ops(index);
return rc;

3
tools/testing/cxl/test/mock.h
View File

@ -25,7 +25,8 @@ struct cxl_mock_ops {
int (*devm_cxl_port_enumerate_dports)(struct cxl_port *port);
struct cxl_hdm *(*devm_cxl_setup_hdm)(struct cxl_port *port);
int (*devm_cxl_add_passthrough_decoder)(struct cxl_port *port);
int (*devm_cxl_enumerate_decoders)(struct cxl_hdm *hdm);
int (*devm_cxl_enumerate_decoders)(
struct cxl_hdm *hdm, struct cxl_endpoint_dvsec_info *info);
};
void register_cxl_mock_ops(struct cxl_mock_ops *ops);