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x86: Add support for more than 8 MTRRs 

At present the mtrr command only support 8 MTRRs. Some SoCs have more than
that. Update the implementation to support up to 10. Read the number of
MTRRs dynamically instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-09-22 14:54:51 -06:00 committed by Bin Meng
parent 51af144eb7
commit 29d2d64ed5
3 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/cpu/mtrr.c
View File

@ -67,9 +67,10 @@ static void set_var_mtrr(uint reg, uint type, uint64_t start, uint64_t size)
void mtrr_read_all(struct mtrr_info *info)
{
int reg_count = mtrr_get_var_count();
int i;
for (i = 0; i < MTRR_COUNT; i++) {
for (i = 0; i < reg_count; i++) {
info->mtrr[i].base = native_read_msr(MTRR_PHYS_BASE_MSR(i));
info->mtrr[i].mask = native_read_msr(MTRR_PHYS_MASK_MSR(i));
}
@ -77,10 +78,11 @@ void mtrr_read_all(struct mtrr_info *info)
void mtrr_write_all(struct mtrr_info *info)
{
int reg_count = mtrr_get_var_count();
struct mtrr_state state;
int i;
for (i = 0; i < MTRR_COUNT; i++) {
for (i = 0; i < reg_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);
@ -156,7 +158,7 @@ int mtrr_commit(bool do_caches)
/* Clear the ones that are unused */
debug("clear\n");
for (; i < MTRR_COUNT; i++)
for (; i < MTRR_MAX_COUNT; i++)
wrmsrl(MTRR_PHYS_MASK_MSR(i), 0);
debug("close\n");
mtrr_close(&state, do_caches);
@ -196,7 +198,7 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size)
return 0;
}
static int get_var_mtrr_count(void)
int mtrr_get_var_count(void)
{
return msr_read(MSR_MTRR_CAP_MSR).lo & MSR_MTRR_CAP_VCNT;
}
@ -207,7 +209,7 @@ static int get_free_var_mtrr(void)
int vcnt;
int i;
vcnt = get_var_mtrr_count();
vcnt = mtrr_get_var_count();
/* Identify the first var mtrr which is not valid */
for (i = 0; i < vcnt; i++) {

15
arch/x86/include/asm/mtrr.h
View File

@ -36,8 +36,8 @@
#define MTRR_BASE_TYPE_MASK 0x7
/* Number of MTRRs supported */
#define MTRR_COUNT 8
/* Maximum number of MTRRs supported - see also mtrr_get_var_count() */
#define MTRR_MAX_COUNT 10
#define NUM_FIXED_MTRRS 11
#define RANGES_PER_FIXED_MTRR 8
@ -87,7 +87,7 @@ struct mtrr {
* @mtrr: Information about each mtrr
*/
struct mtrr_info {
struct mtrr mtrr[MTRR_COUNT];
struct mtrr mtrr[MTRR_MAX_COUNT];
};
/**
@ -180,6 +180,15 @@ int mtrr_set_valid(int cpu_select, int reg, bool valid);
*/
int mtrr_set(int cpu_select, int reg, u64 base, u64 mask);
/**
* mtrr_get_var_count() - Get the number of variable MTRRs
*
* Some CPUs have more than 8 MTRRs. This function returns the actual number
*
* @return number of variable MTRRs
*/
int mtrr_get_var_count(void);
#endif
#if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0)

9
cmd/x86/mtrr.c
View File

@ -27,7 +27,7 @@ static void read_mtrrs(void *arg)
mtrr_read_all(info);
}
static int do_mtrr_list(int cpu_select)
static int do_mtrr_list(int reg_count, int cpu_select)
{
struct mtrr_info info;
int ret;
@ -39,7 +39,7 @@ static int do_mtrr_list(int cpu_select)
ret = mp_run_on_cpus(cpu_select, read_mtrrs, &info);
if (ret)
return log_msg_ret("run", ret);
for (i = 0; i < MTRR_COUNT; i++) {
for (i = 0; i < reg_count; i++) {
const char *type = "Invalid";
uint64_t base, mask, size;
bool valid;
@ -98,6 +98,7 @@ static int do_mtrr_set(int cpu_select, uint reg, int argc, char *const argv[])
static int do_mtrr(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
int reg_count = mtrr_get_var_count();
int cmd;
int cpu_select;
uint reg;
@ -126,7 +127,7 @@ static int do_mtrr(struct cmd_tbl *cmdtp, int flag, int argc,
if (argc < 2)
return CMD_RET_USAGE;
reg = simple_strtoul(argv[1], NULL, 16);
if (reg >= MTRR_COUNT) {
if (reg >= reg_count) {
printf("Invalid register number\n");
return CMD_RET_USAGE;
}
@ -145,7 +146,7 @@ static int do_mtrr(struct cmd_tbl *cmdtp, int flag, int argc,
if (!first)
printf("\n");
printf("CPU %d:\n", i);
ret = do_mtrr_list(i);
ret = do_mtrr_list(reg_count, i);
if (ret) {
printf("Failed to read CPU %d (err=%d)\n", i,
ret);