[PATCH v3 12/17] x86: Return mtrr_add_request() to its old purpose

Simon Glass sjg at chromium.org
Fri May 5 00:50:56 CEST 2023

This function used to be for adding a list of requests to be actioned on
relocation. Revert it back to this purpose, to avoid problems with boards
which need control of their MTRRs (i.e. those which don't use FSP).

The mtrr_set_next_var() function is available when the next free
variable-MTRR must be set, so this can be used instead.

Signed-off-by: Simon Glass <sjg at chromium.org>
Fixes: 3bcd6cf89ef ("x86: mtrr: Skip MSRs that were already programmed..")
Fixes: 596bd0589ad ("x86: mtrr: Do not clear the unused ones..")

Changes in v3:
- Fix invalid commit IDs obtained from another branch

 arch/x86/cpu/mtrr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c
index e69dfb552b1..c174dd9b3ad 100644
--- a/arch/x86/cpu/mtrr.c
+++ b/arch/x86/cpu/mtrr.c
@@ -156,8 +156,12 @@ int mtrr_commit(bool do_caches)
 	debug("open done\n");
 	qsort(req, gd->arch.mtrr_req_count, sizeof(*req), h_comp_mtrr);
 	for (i = 0; i < gd->arch.mtrr_req_count; i++, req++)
-		mtrr_set_next_var(req->type, req->start, req->size);
+		set_var_mtrr(i, req->type, req->start, req->size);
+	/* Clear the ones that are unused */
+	debug("clear\n");
+	for (; i < mtrr_get_var_count(); i++)
+		wrmsrl(MTRR_PHYS_MASK_MSR(i), 0);
 	mtrr_close(&state, do_caches);
 	debug("mtrr done\n");

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