diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2023-02-14 22:41:24 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-02-15 02:45:21 +0300 |
| commit | b777e9bec960a29374dc486d47784c73b7ac4cef (patch) | |
| tree | 0d44be3bf53ba1d04929297e5955f380c26c59f6 /drivers/cxl/core/hdm.c | |
| parent | 9de321e93c3b3fd7fd2621a2557c42fa7d43e314 (diff) | |
| download | linux-b777e9bec960a29374dc486d47784c73b7ac4cef.tar.xz | |
cxl/hdm: Emulate HDM decoder from DVSEC range registers
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>
Diffstat (limited to 'drivers/cxl/core/hdm.c')
| -rw-r--r-- | drivers/cxl/core/hdm.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index dcc16d7cb8f3..c0f224454447 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -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; |