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x86: mtrr: Update MTRRs on all CPUs

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When the boot CPU MTRRs are updated, perform the same update on all other
CPUs so they are kept in sync.

This avoids kernel warnings about mismatched MTRRs.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-17 08:48:25 -06:00 committed by Bin Meng
parent 4f58f73d38
commit aa3a4d870e
1 changed files with 57 additions and 0 deletions
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57
arch/x86/cpu/mtrr.c
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@ -74,10 +74,61 @@ void mtrr_read_all(struct mtrr_info *info)
}
}
void mtrr_write_all(struct mtrr_info *info)
{
struct mtrr_state state;
int i;
for (i = 0; i < MTRR_COUNT; i++) {
mtrr_open(&state, true);
wrmsrl(MTRR_PHYS_BASE_MSR(i), info->mtrr[i].base);
wrmsrl(MTRR_PHYS_MASK_MSR(i), info->mtrr[i].mask);
mtrr_close(&state, true);
}
}
static void write_mtrrs(void *arg)
{
struct mtrr_info *info = arg;
mtrr_write_all(info);
}
static void read_mtrrs(void *arg)
{
struct mtrr_info *info = arg;
mtrr_read_all(info);
}
/**
* mtrr_copy_to_aps() - Copy the MTRRs from the boot CPU to other CPUs
*
* @return 0 on success, -ve on failure
*/
static int mtrr_copy_to_aps(void)
{
struct mtrr_info info;
int ret;
ret = mp_run_on_cpus(MP_SELECT_BSP, read_mtrrs, &info);
if (ret == -ENXIO)
return 0;
else if (ret)
return log_msg_ret("bsp", ret);
ret = mp_run_on_cpus(MP_SELECT_APS, write_mtrrs, &info);
if (ret)
return log_msg_ret("bsp", ret);
return 0;
}
int mtrr_commit(bool do_caches)
{
struct mtrr_request *req = gd->arch.mtrr_req;
struct mtrr_state state;
int ret;
int i;
debug("%s: enabled=%d, count=%d\n", __func__, gd->arch.has_mtrr,
@ -99,6 +150,12 @@ int mtrr_commit(bool do_caches)
mtrr_close(&state, do_caches);
debug("mtrr done\n");
if (gd->flags & GD_FLG_RELOC) {
ret = mtrr_copy_to_aps();
if (ret)
return log_msg_ret("copy", ret);
}
return 0;
}