diff options
| -rw-r--r-- | drivers/cxl/core/atl.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/cxl/core/atl.c b/drivers/cxl/core/atl.c index c36984686fb0..09d0ea1792d9 100644 --- a/drivers/cxl/core/atl.c +++ b/drivers/cxl/core/atl.c @@ -154,6 +154,24 @@ static int cxl_prm_setup_root(struct cxl_root *cxl_root, void *data) return -ENXIO; } + /* + * The current kernel implementation does not support endpoint + * setup with Normalized Addressing. It only translates an + * endpoint's DPA to the SPA range of the host bridge. + * Therefore, the endpoint address range cannot be determined, + * making a non-auto setup impossible. If a decoder requires + * address translation, reprogramming should be disabled and + * the decoder locked. + * + * The BIOS, however, provides all the necessary address + * translation data, which the kernel can use to reconfigure + * endpoint decoders with normalized addresses. Locking the + * decoders in the BIOS would prevent a capable kernel (or + * other operating systems) from shutting down auto-generated + * regions and managing resources dynamically. + */ + cxld->flags |= CXL_DECODER_F_LOCK; + ctx->hpa_range = hpa_range; ctx->interleave_ways = ways; ctx->interleave_granularity = gran; |