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occ.c
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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/*
* Interface with the On Chip Controller,
* which enforces power and thermal management
*
* Copyright 2013-2019 IBM Corp.
*/
#include <skiboot.h>
#include <xscom.h>
#include <xscom-p8-regs.h>
#include <io.h>
#include <cpu.h>
#include <chip.h>
#include <mem_region.h>
#include <timebase.h>
#include <errorlog.h>
#include <opal-api.h>
#include <opal-msg.h>
#include <timer.h>
#include <i2c.h>
#include <powercap.h>
#include <psr.h>
#include <sensor.h>
#include <occ.h>
#include <psi.h>
/* OCC Communication Area for PStates */
#define P8_HOMER_OPAL_DATA_OFFSET 0x1F8000
#define P9_HOMER_OPAL_DATA_OFFSET 0x0E2000
#define OPAL_DYNAMIC_DATA_OFFSET 0x0B80
/* relative to HOMER_OPAL_DATA_OFFSET */
#define MAX_PSTATES 256
#define MAX_P8_CORES 12
#define MAX_P9_CORES 24
#define MAX_OPAL_CMD_DATA_LENGTH 4090
#define MAX_OCC_RSP_DATA_LENGTH 8698
#define P8_PIR_CORE_MASK 0xFFF8
#define P9_PIR_QUAD_MASK 0xFFF0
#define FREQ_MAX_IN_DOMAIN 0
#define FREQ_MOST_RECENTLY_SET 1
/**
* OCC-OPAL Shared Memory Region
*
* Reference document :
* https://github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
*
* Supported layout versions:
* - 0x01, 0x02 : P8
* https://github.com/open-power/occ/blob/master_p8/src/occ/proc/proc_pstate.h
*
* - 0x90 : P9
* https://github.com/open-power/occ/blob/master/src/occ_405/proc/proc_pstate.h
* In 0x90 the data is separated into :-
* -- Static Data (struct occ_pstate_table): Data is written once by OCC
* -- Dynamic Data (struct occ_dynamic_data): Data is updated at runtime
*
* struct occ_pstate_table - Pstate table layout
* @valid: Indicates if data is valid
* @version: Layout version [Major/Minor]
* @v2.throttle: Reason for limiting the max pstate
* @v9.occ_role: OCC role (Master/Slave)
* @v#.pstate_min: Minimum pstate ever allowed
* @v#.pstate_nom: Nominal pstate
* @v#.pstate_turbo: Maximum turbo pstate
* @v#.pstate_ultra_turbo: Maximum ultra turbo pstate and the maximum
* pstate ever allowed
* @v#.pstates: Pstate-id and frequency list from Pmax to Pmin
* @v#.pstates.id: Pstate-id
* @v#.pstates.flags: Pstate-flag(reserved)
* @v2.pstates.vdd: Voltage Identifier
* @v2.pstates.vcs: Voltage Identifier
* @v#.pstates.freq_khz: Frequency in KHz
* @v#.core_max[1..N]: Max pstate with N active cores
* @spare/reserved/pad: Unused data
*/
struct occ_pstate_table {
u8 valid;
u8 version;
union __packed {
struct __packed { /* Version 0x01 and 0x02 */
u8 throttle;
s8 pstate_min;
s8 pstate_nom;
s8 pstate_turbo;
s8 pstate_ultra_turbo;
u8 spare;
u64 reserved;
struct __packed {
s8 id;
u8 flags;
u8 vdd;
u8 vcs;
__be32 freq_khz;
} pstates[MAX_PSTATES];
s8 core_max[MAX_P8_CORES];
u8 pad[100];
} v2;
struct __packed { /* Version 0x90 */
u8 occ_role;
u8 pstate_min;
u8 pstate_nom;
u8 pstate_turbo;
u8 pstate_ultra_turbo;
u8 spare;
u64 reserved1;
u64 reserved2;
struct __packed {
u8 id;
u8 flags;
u16 reserved;
__be32 freq_khz;
} pstates[MAX_PSTATES];
u8 core_max[MAX_P9_CORES];
u8 pad[56];
} v9;
};
} __packed;
/**
* OPAL-OCC Command Response Interface
*
* OPAL-OCC Command Buffer
*
* ---------------------------------------------------------------------
* | OPAL | Cmd | OPAL | | Cmd Data | Cmd Data | OPAL |
* | Cmd | Request | OCC | Reserved | Length | Length | Cmd |
* | Flags | ID | Cmd | | (MSB) | (LSB) | Data... |
* ---------------------------------------------------------------------
* | ….OPAL Command Data up to max of Cmd Data Length 4090 bytes |
* | |
* ---------------------------------------------------------------------
*
* OPAL Command Flag
*
* -----------------------------------------------------------------
* | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
* | (msb) | | | | | | | (lsb) |
* -----------------------------------------------------------------
* |Cmd | | | | | | | |
* |Ready | | | | | | | |
* -----------------------------------------------------------------
*
* struct opal_command_buffer - Defines the layout of OPAL command buffer
* @flag: Provides general status of the command
* @request_id: Token to identify request
* @cmd: Command sent
* @data_size: Command data length
* @data: Command specific data
* @spare: Unused byte
*/
struct opal_command_buffer {
u8 flag;
u8 request_id;
u8 cmd;
u8 spare;
u16 data_size;
u8 data[MAX_OPAL_CMD_DATA_LENGTH];
} __packed;
/**
* OPAL-OCC Response Buffer
*
* ---------------------------------------------------------------------
* | OCC | Cmd | OPAL | Response | Rsp Data | Rsp Data | OPAL |
* | Rsp | Request | OCC | Status | Length | Length | Rsp |
* | Flags | ID | Cmd | | (MSB) | (LSB) | Data... |
* ---------------------------------------------------------------------
* | ….OPAL Response Data up to max of Rsp Data Length 8698 bytes |
* | |
* ---------------------------------------------------------------------
*
* OCC Response Flag
*
* -----------------------------------------------------------------
* | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
* | (msb) | | | | | | | (lsb) |
* -----------------------------------------------------------------
* | | | | | | |OCC in | Rsp |
* | | | | | | |progress|Ready |
* -----------------------------------------------------------------
*
* struct occ_response_buffer - Defines the layout of OCC response buffer
* @flag: Provides general status of the response
* @request_id: Token to identify request
* @cmd: Command requested
* @status: Indicates success/failure status of
* the command
* @data_size: Response data length
* @data: Response specific data
*/
struct occ_response_buffer {
u8 flag;
u8 request_id;
u8 cmd;
u8 status;
u16 data_size;
u8 data[MAX_OCC_RSP_DATA_LENGTH];
} __packed;
/**
* OCC-OPAL Shared Memory Interface Dynamic Data Vx90
*
* struct occ_dynamic_data - Contains runtime attributes
* @occ_state: Current state of OCC
* @major_version: Major version number
* @minor_version: Minor version number (backwards compatible)
* Version 1 indicates GPU presence populated
* @gpus_present: Bitmask of GPUs present (on systems where GPU
* presence is detected through APSS)
* @cpu_throttle: Reason for limiting the max pstate
* @mem_throttle: Reason for throttling memory
* @quick_pwr_drop: Indicates if QPD is asserted
* @pwr_shifting_ratio: Indicates the current percentage of power to
* take away from the CPU vs GPU when shifting
* power to maintain a power cap. Value of 100
* means take all power from CPU.
* @pwr_cap_type: Indicates type of power cap in effect
* @hard_min_pwr_cap: Hard minimum system power cap in Watts.
* Guaranteed unless hardware failure
* @max_pwr_cap: Maximum allowed system power cap in Watts
* @cur_pwr_cap: Current system power cap
* @soft_min_pwr_cap: Soft powercap minimum. OCC may or may not be
* able to maintain this
* @spare/reserved: Unused data
* @cmd: Opal Command Buffer
* @rsp: OCC Response Buffer
*/
struct occ_dynamic_data {
u8 occ_state;
u8 major_version;
u8 minor_version;
u8 gpus_present;
u8 spare1;
u8 cpu_throttle;
u8 mem_throttle;
u8 quick_pwr_drop;
u8 pwr_shifting_ratio;
u8 pwr_cap_type;
u16 hard_min_pwr_cap;
u16 max_pwr_cap;
u16 cur_pwr_cap;
u16 soft_min_pwr_cap;
u8 pad[110];
struct opal_command_buffer cmd;
struct occ_response_buffer rsp;
} __packed;
static bool occ_reset;
static struct lock occ_lock = LOCK_UNLOCKED;
static unsigned long homer_opal_data_offset;
DEFINE_LOG_ENTRY(OPAL_RC_OCC_PSTATE_INIT, OPAL_PLATFORM_ERR_EVT, OPAL_OCC,
OPAL_CEC_HARDWARE, OPAL_INFO,
OPAL_NA);
DEFINE_LOG_ENTRY(OPAL_RC_OCC_TIMEOUT, OPAL_PLATFORM_ERR_EVT, OPAL_OCC,
OPAL_CEC_HARDWARE, OPAL_UNRECOVERABLE_ERR_GENERAL,
OPAL_NA);
/*
* POWER9 and newer platforms have pstate values which are unsigned
* positive values. They are continuous set of unsigned integers
* [0 to +N] where Pmax is 0 and Pmin is N. The linear ordering of
* pstates for P9 has changed compared to P8. Where P8 has negative
* pstate values advertised as [0 to -N] where Pmax is 0 and
* Pmin is -N. The following routine helps to abstract pstate
* comparison with pmax and perform sanity checks on pstate limits.
*/
/**
* cmp_pstates: Compares the given two pstates and determines which
* among them is associated with a higher pstate.
*
* @a,@b: The pstate ids of the pstates being compared.
*
* Returns: -1 : If pstate associated with @a is smaller than
* the pstate associated with @b.
* 0 : If pstates associated with @a and @b are equal.
* 1 : If pstate associated with @a is greater than
* the pstate associated with @b.
*/
static int cmp_pstates(int a, int b)
{
/* P8 has 0 to -N (pmax to pmin), P9 has 0 to +N (pmax to pmin) */
if (a > b)
return (proc_gen == proc_gen_p8)? 1 : -1;
else if (a < b)
return (proc_gen == proc_gen_p8)? -1 : 1;
return 0;
}
static inline
struct occ_pstate_table *get_occ_pstate_table(struct proc_chip *chip)
{
return (struct occ_pstate_table *)
(chip->homer_base + homer_opal_data_offset);
}
static inline
struct occ_dynamic_data *get_occ_dynamic_data(struct proc_chip *chip)
{
return (struct occ_dynamic_data *)
(chip->homer_base + homer_opal_data_offset +
OPAL_DYNAMIC_DATA_OFFSET);
}
/*
* On Chips which have at least one active EX unit, check the
* HOMER area for pstate-table valid bit on versions 0x1 and 0x2, or
* HOMER dynamic area occ_state on version 0x90.
*/
static bool wait_for_all_occ_init(void)
{
struct proc_chip *chip;
struct dt_node *xn;
struct occ_pstate_table *occ_data;
struct occ_dynamic_data *occ_dyn_data;
int tries;
uint64_t start_time, end_time;
uint32_t timeout = 0;
if (platform.occ_timeout)
timeout = platform.occ_timeout();
start_time = mftb();
for_each_chip(chip) {
u8 version;
/*
* If the chip doesn't any EX unit present, then OCC
* will not update the pstate-table. So, skip the
* check.
*/
if (!chip->ex_present) {
prlog(PR_DEBUG, "OCC: Chip %02x has no active EX units. Skipping check\n",
chip->id);
continue;
}
/* Check for valid homer address */
if (!chip->homer_base) {
/**
* @fwts-label OCCInvalidHomerBase
* @fwts-advice The HOMER base address for a chip
* was not valid. This means that OCC (On Chip
* Controller) will be non-functional and CPU
* frequency scaling will not be functional. CPU may
* be set to a safe, low frequency. Power savings in
* CPU idle or CPU hotplug may be impacted.
*/
prlog(PR_ERR,"OCC: Chip: %x homer_base is not valid\n",
chip->id);
return false;
}
/* Get PState table address */
occ_data = get_occ_pstate_table(chip);
/*
* Wait for the OCC to set an appropriate version bit.
* The wait is needed since on some platforms (such P8
* Tuletta), OCC is not loaded before OPAL boot. Hence
* initialization can take a while.
*
* Note: Checking for occ_data->version == (0x01/0x02/0x90)
* is ok because we clear all of
* homer_base+size before passing memory to host
* services. This ensures occ_data->version == 0x0
* before OCC load.
*/
tries = timeout * 10;
while (tries--) {
version = occ_data->version;
if (version == 0x01 || version == 0x02 ||
version == 0x90)
break;
time_wait_ms(100);
}
version = occ_data->version;
switch (version) {
case 0x1:
case 0x2:
/*
* OCC-OPAL interface version 0x1 and 0x2 do not have
* the dynamic data. Hence the the only way to figure out
* if the OCC is up or not is to check the valid-bit
* in the pstate table.
*/
if (occ_data->valid != 1) {
/**
* @fwts-label OCCInvalidPStateTable
* @fwts-advice The pstate table for a chip
* was not valid. This means that OCC (On Chip
* Controller) will be non-functional and CPU
* frequency scaling will not be functional. CPU may
* be set to a low, safe frequency. This means
* that CPU idle states and CPU frequency scaling
* may not be functional.
*/
prlog(PR_ERR, "OCC: Chip: %x PState table is not valid\n",
chip->id);
return false;
}
break;
case 0x90:
/*
* OCC-OPAL interface version 0x90 has a
* dynamic data section. This has an
* occ_state field whose values inform about
* the state of the OCC.
*
* 0x00 = OCC not running. No communication
* allowed.
*
* 0x01 = Standby. No communication allowed.
*
* 0x02 = Observation State. Communication
* allowed and is command dependent.
*
* 0x03 = Active State. Communication allowed
* and is command dependent.
*
* 0x04 = Safe State. No communication
* allowed. Just like CPU throttle
* status, some failures will not allow
* for OCC to update state to safe.
*
* 0x05 = Characterization State.
* Communication allowed and is command
* dependent.
*
* We will error out if OCC is not in the
* Active State.
*
* XXX : Should we error out only if no
* communication is allowed with the
* OCC ?
*/
occ_dyn_data = get_occ_dynamic_data(chip);
if (occ_dyn_data->occ_state != 0x3) {
/**
* @fwts-label OCCInactive
* @fwts-advice The OCC for a chip was not active.
* This means that CPU frequency scaling will
* not be functional. CPU may be set to a low,
* safe frequency. This means that CPU idle
* states and CPU frequency scaling may not be
* functional.
*/
prlog(PR_ERR, "OCC: Chip: %x: OCC not active\n",
chip->id);
return false;
}
break;
default:
prlog(PR_ERR, "OCC: Unknown OCC-OPAL interface version.\n");
return false;
}
if (!chip->occ_functional)
chip->occ_functional = true;
prlog(PR_DEBUG, "OCC: Chip %02x Data (%016llx) = %016llx\n",
chip->id, (uint64_t)occ_data, be64_to_cpu(*(__be64 *)occ_data));
if (version == 0x90) {
occ_dyn_data = get_occ_dynamic_data(chip);
prlog(PR_DEBUG, "OCC: Chip %02x Dynamic Data (%016llx) = %016llx\n",
chip->id, (uint64_t)occ_dyn_data,
be64_to_cpu(*(__be64 *)occ_dyn_data));
}
}
end_time = mftb();
prlog(PR_NOTICE, "OCC: All Chip Rdy after %lu ms\n",
tb_to_msecs(end_time - start_time));
dt_for_each_compatible(dt_root, xn, "ibm,xscom") {
const struct dt_property *p;
p = dt_find_property(xn, "ibm,occ-functional-state");
if (!p)
dt_add_property_cells(xn, "ibm,occ-functional-state",
0x1);
}
return true;
}
/*
* OCC provides pstate table entries in continuous descending order.
* Parse the pstate table to skip pstate_ids that are greater
* than Pmax. If a pstate_id is equal to Pmin then add it to
* the list and break from the loop as this is the last valid
* element in the pstate table.
*/
static void parse_pstates_v2(struct occ_pstate_table *data, __be32 *dt_id,
__be32 *dt_freq, int nr_pstates, int pmax, int pmin)
{
int i, j;
for (i = 0, j = 0; i < MAX_PSTATES && j < nr_pstates; i++) {
if (cmp_pstates(data->v2.pstates[i].id, pmax) > 0)
continue;
dt_id[j] = cpu_to_be32(data->v2.pstates[i].id);
dt_freq[j] = cpu_to_be32(be32_to_cpu(data->v2.pstates[i].freq_khz) / 1000);
j++;
if (data->v2.pstates[i].id == pmin)
break;
}
if (j != nr_pstates)
prerror("OCC: Expected pstates(%d) is not equal to parsed pstates(%d)\n",
nr_pstates, j);
}
static void parse_pstates_v9(struct occ_pstate_table *data, __be32 *dt_id,
__be32 *dt_freq, int nr_pstates, int pmax, int pmin)
{
int i, j;
for (i = 0, j = 0; i < MAX_PSTATES && j < nr_pstates; i++) {
if (cmp_pstates(data->v9.pstates[i].id, pmax) > 0)
continue;
dt_id[j] = cpu_to_be32(data->v9.pstates[i].id);
dt_freq[j] = cpu_to_be32(be32_to_cpu(data->v9.pstates[i].freq_khz) / 1000);
j++;
if (data->v9.pstates[i].id == pmin)
break;
}
if (j != nr_pstates)
prerror("OCC: Expected pstates(%d) is not equal to parsed pstates(%d)\n",
nr_pstates, j);
}
static void parse_vid(struct occ_pstate_table *occ_data,
struct dt_node *node, u8 nr_pstates,
int pmax, int pmin)
{
u8 *dt_vdd, *dt_vcs;
int i, j;
dt_vdd = malloc(nr_pstates);
assert(dt_vdd);
dt_vcs = malloc(nr_pstates);
assert(dt_vcs);
for (i = 0, j = 0; i < MAX_PSTATES && j < nr_pstates; i++) {
if (cmp_pstates(occ_data->v2.pstates[i].id, pmax) > 0)
continue;
dt_vdd[j] = occ_data->v2.pstates[i].vdd;
dt_vcs[j] = occ_data->v2.pstates[i].vcs;
j++;
if (occ_data->v2.pstates[i].id == pmin)
break;
}
dt_add_property(node, "ibm,pstate-vdds", dt_vdd, nr_pstates);
dt_add_property(node, "ibm,pstate-vcss", dt_vcs, nr_pstates);
free(dt_vdd);
free(dt_vcs);
}
/* Add device tree properties to describe pstates states */
/* Return nominal pstate to set in each core */
static bool add_cpu_pstate_properties(struct dt_node *power_mgt,
int *pstate_nom)
{
struct proc_chip *chip;
uint64_t occ_data_area;
struct occ_pstate_table *occ_data = NULL;
/* Arrays for device tree */
__be32 *dt_id, *dt_freq;
int pmax, pmin, pnom;
u8 nr_pstates;
bool ultra_turbo_supported;
int i, major, minor;
prlog(PR_DEBUG, "OCC: CPU pstate state device tree init\n");
/*
* Find first chip with an OCC which has as a valid
* pstate-table
*/
for_each_chip(chip) {
occ_data = get_occ_pstate_table(chip);
/* Dump first 16 bytes of PState table */
occ_data_area = (uint64_t)occ_data;
prlog(PR_DEBUG, "OCC: Chip %02d :Data (%16llx) = %16llx %16llx\n",
chip->id, occ_data_area,
be64_to_cpu(*(__be64 *)occ_data_area),
be64_to_cpu(*(__be64 *)(occ_data_area + 8)));
if (occ_data->valid)
break;
/*
* XXX : Error out if !occ_data->valid but Chip has at
* least one EX Unit?
*/
}
assert(occ_data);
if (!occ_data->valid) {
/**
* @fwts-label OCCInvalidPStateTableDT
* @fwts-advice The pstate tables for none of the chips
* are valid. This means that OCC (On Chip
* Controller) will be non-functional. This means
* that CPU idle states and CPU frequency scaling
* will not be functional as OPAL doesn't populate
* the device tree with pstates in this case.
*/
prlog(PR_ERR, "OCC: PState table is not valid\n");
return false;
}
/*
* Workload-Optimized-Frequency(WOF) or Ultra-Turbo is supported
* from version 0x02 onwards. If WOF is disabled then, the max
* ultra_turbo pstate will be equal to max turbo pstate.
*/
ultra_turbo_supported = true;
major = occ_data->version >> 4;
minor = occ_data->version & 0xF;
/* Parse Pmax, Pmin and Pnominal */
switch (major) {
case 0:
if (proc_gen == proc_gen_p9) {
/**
* @fwts-label OCCInvalidVersion02
* @fwts-advice The PState table layout version is not
* supported in P9. So OPAL will not parse the PState
* table. CPU frequency scaling will not be functional
* as frequency and pstate-ids are not added to DT.
*/
prerror("OCC: Version %x is not supported in P9\n",
occ_data->version);
return false;
}
if (minor == 0x1)
ultra_turbo_supported = false;
pmin = occ_data->v2.pstate_min;
pnom = occ_data->v2.pstate_nom;
if (ultra_turbo_supported)
pmax = occ_data->v2.pstate_ultra_turbo;
else
pmax = occ_data->v2.pstate_turbo;
break;
case 0x9:
if (proc_gen == proc_gen_p8) {
/**
* @fwts-label OCCInvalidVersion90
* @fwts-advice The PState table layout version is not
* supported in P8. So OPAL will not parse the PState
* table. CPU frequency scaling will not be functional
* as frequency and pstate-ids are not added to DT.
*/
prerror("OCC: Version %x is not supported in P8\n",
occ_data->version);
return false;
}
pmin = occ_data->v9.pstate_min;
pnom = occ_data->v9.pstate_nom;
pmax = occ_data->v9.pstate_ultra_turbo;
break;
default:
/**
* @fwts-label OCCUnsupportedVersion
* @fwts-advice The PState table layout version is not
* supported. So OPAL will not parse the PState table.
* CPU frequency scaling will not be functional as OPAL
* doesn't populate the device tree with pstates.
*/
prerror("OCC: Unsupported pstate table layout version %d\n",
occ_data->version);
return false;
}
/* Sanity check for pstate limits */
if (cmp_pstates(pmin, pmax) > 0) {
/**
* @fwts-label OCCInvalidPStateLimits
* @fwts-advice The min pstate is greater than the
* max pstate, this could be due to corrupted/invalid
* data in OCC-OPAL shared memory region. So OPAL has
* not added pstates to device tree. This means that
* CPU Frequency management will not be functional in
* the host.
*/
prerror("OCC: Invalid pstate limits. Pmin(%d) > Pmax (%d)\n",
pmin, pmax);
return false;
}
if (cmp_pstates(pnom, pmax) > 0) {
/**
* @fwts-label OCCInvalidNominalPState
* @fwts-advice The nominal pstate is greater than the
* max pstate, this could be due to corrupted/invalid
* data in OCC-OPAL shared memory region. So OPAL has
* limited the nominal pstate to max pstate.
*/
prerror("OCC: Clipping nominal pstate(%d) to Pmax(%d)\n",
pnom, pmax);
pnom = pmax;
}
nr_pstates = labs(pmax - pmin) + 1;
prlog(PR_DEBUG, "OCC: Version %x Min %d Nom %d Max %d Nr States %d\n",
occ_data->version, pmin, pnom, pmax, nr_pstates);
if ((major == 0x9 && nr_pstates <= 1) ||
(major == 0 && (nr_pstates <= 1 || nr_pstates > 128))) {
/**
* @fwts-label OCCInvalidPStateRange
* @fwts-advice The number of pstates is outside the valid
* range (currently <=1 or > 128 on p8, >255 on P9), so OPAL
* has not added pstates to the device tree. This means that
* OCC (On Chip Controller) will be non-functional. This means
* that CPU idle states and CPU frequency scaling
* will not be functional.
*/
prerror("OCC: OCC range is not valid; No of pstates = %d\n",
nr_pstates);
return false;
}
dt_id = malloc(nr_pstates * sizeof(__be32));
assert(dt_id);
dt_freq = malloc(nr_pstates * sizeof(__be32));
assert(dt_freq);
switch (major) {
case 0:
parse_pstates_v2(occ_data, dt_id, dt_freq, nr_pstates,
pmax, pmin);
break;
case 0x9:
parse_pstates_v9(occ_data, dt_id, dt_freq, nr_pstates,
pmax, pmin);
break;
default:
return false;
}
/* Add the device-tree entries */
dt_add_property(power_mgt, "ibm,pstate-ids", dt_id,
nr_pstates * sizeof(__be32));
dt_add_property(power_mgt, "ibm,pstate-frequencies-mhz", dt_freq,
nr_pstates * sizeof(__be32));
dt_add_property_cells(power_mgt, "ibm,pstate-min", pmin);
dt_add_property_cells(power_mgt, "ibm,pstate-nominal", pnom);
dt_add_property_cells(power_mgt, "ibm,pstate-max", pmax);
free(dt_freq);
free(dt_id);
/*
* Parse and add WOF properties: turbo, ultra-turbo and core_max array.
* core_max[1..n] array provides the max sustainable pstate that can be
* achieved with i active cores in the chip.
*/
if (ultra_turbo_supported) {
int pturbo, pultra_turbo;
u8 nr_cores = get_available_nr_cores_in_chip(chip->id);
__be32 *dt_cmax;
dt_cmax = malloc(nr_cores * sizeof(u32));
assert(dt_cmax);
switch (major) {
case 0:
pturbo = occ_data->v2.pstate_turbo;
pultra_turbo = occ_data->v2.pstate_ultra_turbo;
for (i = 0; i < nr_cores; i++)
dt_cmax[i] = cpu_to_be32(occ_data->v2.core_max[i]);
break;
case 0x9:
pturbo = occ_data->v9.pstate_turbo;
pultra_turbo = occ_data->v9.pstate_ultra_turbo;
for (i = 0; i < nr_cores; i++)
dt_cmax[i] = cpu_to_be32(occ_data->v9.core_max[i]);
break;
default:
return false;
}
if (cmp_pstates(pturbo, pmax) > 0) {
prerror("OCC: Clipping turbo pstate(%d) to Pmax(%d)\n",
pturbo, pmax);
dt_add_property_cells(power_mgt, "ibm,pstate-turbo",
pmax);
} else {
dt_add_property_cells(power_mgt, "ibm,pstate-turbo",
pturbo);
}
dt_add_property_cells(power_mgt, "ibm,pstate-ultra-turbo",
pultra_turbo);
dt_add_property(power_mgt, "ibm,pstate-core-max", dt_cmax,
nr_cores * sizeof(u32));
dt_add_property_cells(power_mgt, "ibm,pstate-base", pturbo);
free(dt_cmax);
}
if (major == 0x9)
goto out;
dt_add_property_cells(power_mgt, "#address-cells", 2);
dt_add_property_cells(power_mgt, "#size-cells", 1);
/* Add chip specific pstate properties */
for_each_chip(chip) {
struct dt_node *occ_node;
occ_data = get_occ_pstate_table(chip);
occ_node = dt_new_addr(power_mgt, "occ", (uint64_t)occ_data);
if (!occ_node) {
/**
* @fwts-label OCCDTFailedNodeCreation
* @fwts-advice Failed to create
* /ibm,opal/power-mgt/occ. Per-chip pstate properties
* are not added to Device Tree.
*/
prerror("OCC: Failed to create /ibm,opal/power-mgt/occ@%llx\n",
(uint64_t)occ_data);
return false;
}
dt_add_property_cells(occ_node, "reg",
hi32((uint64_t)occ_data),
lo32((uint64_t)occ_data),
OPAL_DYNAMIC_DATA_OFFSET +
sizeof(struct occ_dynamic_data));
dt_add_property_cells(occ_node, "ibm,chip-id", chip->id);
/*
* Parse and add pstate Voltage Identifiers (VID) to DT which
* are provided by OCC in version 0x01 and 0x02
*/
parse_vid(occ_data, occ_node, nr_pstates, pmax, pmin);
}
out:
/* Return pstate to set for each core */
*pstate_nom = pnom;
return true;
}
/*
* Prepare chip for pstate transitions
*/
static bool cpu_pstates_prepare_core(struct proc_chip *chip,
struct cpu_thread *c,
int pstate_nom)
{
uint32_t core = pir_to_core_id(c->pir);
uint64_t tmp, pstate;
int rc;
/*
* Currently Fastsleep init clears EX_PM_SPR_OVERRIDE_EN.
* Need to ensure only relevant bits are inited
*/
/* Init PM GP1 for SCOM based PSTATE control to set nominal freq
*
* Use the OR SCOM to set the required bits in PM_GP1 register
* since the OCC might be mainpulating the PM_GP1 register as well.
*/
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_SET_GP1),
EX_PM_SETUP_GP1_PM_SPR_OVERRIDE_EN);
if (rc) {
log_simple_error(&e_info(OPAL_RC_OCC_PSTATE_INIT),
"OCC: Failed to write PM_GP1 in pstates init\n");
return false;
}
/* Set new pstate to core */
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_PPMCR), &tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_OCC_PSTATE_INIT),
"OCC: Failed to read PM_PPMCR from OCC in pstates init\n");
return false;
}
tmp = tmp & ~0xFFFF000000000000ULL;
pstate = ((uint64_t) pstate_nom) & 0xFF;
tmp = tmp | (pstate << 56) | (pstate << 48);
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_PPMCR), tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_OCC_PSTATE_INIT),
"OCC: Failed to write PM_PPMCR in pstates init\n");
return false;
}
time_wait_ms(1); /* Wait for PState to change */
/*
* Init PM GP1 for SPR based PSTATE control.
* Once OCC is active EX_PM_SETUP_GP1_DPLL_FREQ_OVERRIDE_EN will be
* cleared by OCC. Sapphire need not clear.
* However wait for DVFS state machine to become idle after min->nominal
* transition initiated above. If not switch over to SPR control could fail.
*
* Use the AND SCOM to clear the required bits in PM_GP1 register
* since the OCC might be mainpulating the PM_GP1 register as well.
*/
tmp = ~EX_PM_SETUP_GP1_PM_SPR_OVERRIDE_EN;
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_CLEAR_GP1),
tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_OCC_PSTATE_INIT),
"OCC: Failed to write PM_GP1 in pstates init\n");
return false;
}
/* Just debug */
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_PPMSR), &tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_OCC_PSTATE_INIT),
"OCC: Failed to read PM_PPMSR from OCC"
"in pstates init\n");
return false;
}
prlog(PR_DEBUG, "OCC: Chip %x Core %x PPMSR %016llx\n",
chip->id, core, tmp);
/*
* If PMSR is still in transition at this point due to PState change
* initiated above, then the switchover to SPR may not work.
* ToDo: Check for DVFS state machine idle before change.
*/
return true;
}
static bool occ_opal_msg_outstanding = false;
static void occ_msg_consumed(void *data __unused, int status __unused)
{
lock(&occ_lock);
occ_opal_msg_outstanding = false;
unlock(&occ_lock);
}
static inline u8 get_cpu_throttle(struct proc_chip *chip)
{
struct occ_pstate_table *pdata = get_occ_pstate_table(chip);
struct occ_dynamic_data *data;
switch (pdata->version >> 4) {
case 0:
return pdata->v2.throttle;
case 0x9:
data = get_occ_dynamic_data(chip);
return data->cpu_throttle;
default:
return 0;
};
}
bool is_occ_reset(void)
{
return occ_reset;
}
static void occ_throttle_poll(void *data __unused)
{
struct proc_chip *chip;
struct occ_pstate_table *occ_data;
struct opal_occ_msg occ_msg;
int rc;
if (!try_lock(&occ_lock))
return;
if (occ_reset) {
int inactive = 0;
for_each_chip(chip) {
occ_data = get_occ_pstate_table(chip);
if (occ_data->valid != 1) {
inactive = 1;