arch/x86/acpigen: add methods for cppc

This change adds 2 methods for Conginuous Performance Control that was
added in ACPI 5.0 and expanded twice in later versions.  One function
will create a global table based on a provided struct, while the other
function is used to add a _CPC method in each processor object.

Change-Id: I8798a4c72c681b960087ed65668f01b2ca77d2ce
Signed-off-by: Matt Delco <delco@chromium.org>
Reviewed-on: https://review.coreboot.org/28066
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Matt Delco 2018-08-13 13:36:27 -07:00 committed by Duncan Laurie
parent e37d771001
commit b425bc8cd0
2 changed files with 108 additions and 0 deletions

View File

@ -1339,6 +1339,55 @@ void acpigen_write_dsm_uuid_arr(struct dsm_uuid *ids, size_t count)
acpigen_pop_len(); /* Method _DSM */
}
#define CPPC_PACKAGE_NAME "\\GCPC"
void acpigen_write_CPPC_package(const struct cppc_config *config)
{
u32 i;
u32 max;
switch (config->version) {
case 1:
max = CPPC_MAX_FIELDS_VER_1;
break;
case 2:
max = CPPC_MAX_FIELDS_VER_2;
break;
case 3:
max = CPPC_MAX_FIELDS_VER_3;
break;
default:
printk(BIOS_ERR, "ERROR: CPPC version %u is not implemented\n",
config->version);
return;
}
acpigen_write_name(CPPC_PACKAGE_NAME);
/* Adding 2 to account for length and version fields */
acpigen_write_package(max + 2);
acpigen_write_dword(max + 2);
acpigen_write_byte(config->version);
for (i = 0; i < max; ++i) {
const acpi_addr_t *reg = &(config->regs[i]);
if (reg->space_id == ACPI_ADDRESS_SPACE_MEMORY &&
reg->bit_width == 32 && reg->access_size == 0) {
acpigen_write_dword(reg->addrl);
} else {
acpigen_write_register_resource(reg);
}
}
acpigen_pop_len();
}
void acpigen_write_CPPC_method(void)
{
acpigen_write_method("_CPC", 0);
acpigen_emit_byte(RETURN_OP);
acpigen_emit_namestring(CPPC_PACKAGE_NAME);
acpigen_pop_len();
}
/*
* Generate ACPI AML code for _ROM method.
* This function takes as input ROM data and ROM length.

View File

@ -167,6 +167,56 @@ struct dsm_uuid {
void *arg;
};
/*version 1 has 15 fields, version 2 has 19, and version 3 has 21 */
enum cppc_fields {
CPPC_HIGHEST_PERF, /* can be DWORD */
CPPC_NOMINAL_PERF, /* can be DWORD */
CPPC_LOWEST_NONL_PERF, /* can be DWORD */
CPPC_LOWEST_PERF, /* can be DWORD */
CPPC_GUARANTEED_PERF,
CPPC_DESIRED_PERF,
CPPC_MIN_PERF,
CPPC_MAX_PERF,
CPPC_PERF_REDUCE_TOLERANCE,
CPPC_TIME_WINDOW,
CPPC_COUNTER_WRAP, /* can be DWORD */
CPPC_REF_PERF_COUNTER,
CPPC_DELIVERED_PERF_COUNTER,
CPPC_PERF_LIMITED,
CPPC_ENABLE, /* can be System I/O */
CPPC_MAX_FIELDS_VER_1,
CPPC_AUTO_SELECT = /* can be DWORD */
CPPC_MAX_FIELDS_VER_1,
CPPC_AUTO_ACTIVITY_WINDOW,
CPPC_PERF_PREF,
CPPC_REF_PERF, /* can be DWORD */
CPPC_MAX_FIELDS_VER_2,
CPPC_LOWEST_FREQ = /* can be DWORD */
CPPC_MAX_FIELDS_VER_2,
CPPC_NOMINAL_FREQ, /* can be DWORD */
CPPC_MAX_FIELDS_VER_3,
};
struct cppc_config {
u32 version; /* must be 1, 2, or 3 */
/*
* The generic acpi_addr_t structure is being used, though
* anything besides PPC or FFIXED generally requires checking
* if the OS has advertised support for it (via _OSC).
*
* NOTE: some fields permit DWORDs to be used. If you
* provide a System Memory register with all zeros (which
* represents unsupported) then this will be used as-is.
* Otherwise, a System Memory register with a 32-bit
* width will be converted into a DWORD field (the value
* of which will be the value of 'addrl'. Any other use
* of System Memory register is currently undefined.
* (i.e., if you have an actual need for System Memory
* then you'll need to adjust this kludge).
*/
acpi_addr_t regs[CPPC_MAX_FIELDS_VER_3];
};
void acpigen_write_return_integer(uint64_t arg);
void acpigen_write_return_string(const char *arg);
void acpigen_write_len_f(void);
@ -268,6 +318,15 @@ void acpigen_write_dsm(const char *uuid, void (**callbacks)(void *),
size_t count, void *arg);
void acpigen_write_dsm_uuid_arr(struct dsm_uuid *ids, size_t count);
/*
* Generate ACPI AML code for _CPC (Continuous Perfmance Control).
* Execute the package function once to create a global table, then
* execute the method function within each processor object to
* create a method that points to the global table.
*/
void acpigen_write_CPPC_package(const struct cppc_config *config);
void acpigen_write_CPPC_method(void);
/*
* Generate ACPI AML code for _ROM method.
* This function takes as input ROM data and ROM length.