/*
* Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "gk20a/gk20a.h"
#include "clk/clk.h"
#include "clk_arb_linux.h"
#include "pstate/pstate.h"
#include "lpwr/lpwr.h"
#include "volt/volt.h"
int nvgpu_clk_notification_queue_alloc(struct gk20a *g,
struct nvgpu_clk_notification_queue *queue,
size_t events_number) {
queue->notifications = nvgpu_kcalloc(g, events_number,
sizeof(struct nvgpu_clk_notification));
if (!queue->notifications)
return -ENOMEM;
queue->size = events_number;
nvgpu_atomic_set(&queue->head, 0);
nvgpu_atomic_set(&queue->tail, 0);
return 0;
}
void nvgpu_clk_notification_queue_free(struct gk20a *g,
struct nvgpu_clk_notification_queue *queue) {
nvgpu_kfree(g, queue->notifications);
queue->size = 0;
nvgpu_atomic_set(&queue->head, 0);
nvgpu_atomic_set(&queue->tail, 0);
}
static void nvgpu_clk_arb_queue_notification(struct gk20a *g,
struct nvgpu_clk_notification_queue *queue,
u32 alarm_mask) {
u32 queue_index;
u64 timestamp;
queue_index = (nvgpu_atomic_inc_return(&queue->tail)) % queue->size;
/* get current timestamp */
timestamp = (u64) sched_clock();
queue->notifications[queue_index].timestamp = timestamp;
queue->notifications[queue_index].notification = alarm_mask;
}
static void nvgpu_clk_arb_set_global_alarm(struct gk20a *g, u32 alarm)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
u64 current_mask;
u32 refcnt;
u32 alarm_mask;
u64 new_mask;
do {
current_mask = nvgpu_atomic64_read(&arb->alarm_mask);
/* atomic operations are strong so they do not need masks */
refcnt = ((u32) (current_mask >> 32)) + 1;
alarm_mask = (u32) (current_mask & ~0) | alarm;
new_mask = ((u64) refcnt << 32) | alarm_mask;
} while (unlikely(current_mask !=
(u64)nvgpu_atomic64_cmpxchg(&arb->alarm_mask,
current_mask, new_mask)));
nvgpu_clk_arb_queue_notification(g, &arb->notification_queue, alarm);
}
static int nvgpu_clk_arb_update_vf_table(struct nvgpu_clk_arb *arb)
{
struct gk20a *g = arb->g;
struct nvgpu_clk_vf_table *table;
u32 i, j;
int status = -EINVAL;
u32 gpc2clk_voltuv = 0, mclk_voltuv = 0;
u32 gpc2clk_voltuv_sram = 0, mclk_voltuv_sram = 0;
u16 clk_cur;
u32 num_points;
struct clk_set_info *p5_info, *p0_info;
table = NV_ACCESS_ONCE(arb->current_vf_table);
/* make flag visible when all data has resolved in the tables */
nvgpu_smp_rmb();
table = (table == &arb->vf_table_pool[0]) ? &arb->vf_table_pool[1] :
&arb->vf_table_pool[0];
/* Get allowed memory ranges */
if (g->ops.clk_arb.get_arbiter_clk_range(g, CTRL_CLK_DOMAIN_GPC2CLK,
&arb->gpc2clk_min,
&arb->gpc2clk_max) < 0) {
nvgpu_err(g, "failed to fetch GPC2CLK range");
goto exit_vf_table;
}
if (g->ops.clk_arb.get_arbiter_clk_range(g, CTRL_CLK_DOMAIN_MCLK,
&arb->mclk_min,
&arb->mclk_max) < 0) {
nvgpu_err(g, "failed to fetch MCLK range");
goto exit_vf_table;
}
table->gpc2clk_num_points = MAX_F_POINTS;
table->mclk_num_points = MAX_F_POINTS;
if (clk_domain_get_f_points(arb->g, CTRL_CLK_DOMAIN_GPC2CLK,
&table->gpc2clk_num_points, arb->gpc2clk_f_points)) {
nvgpu_err(g, "failed to fetch GPC2CLK frequency points");
goto exit_vf_table;
}
if (clk_domain_get_f_points(arb->g, CTRL_CLK_DOMAIN_MCLK,
&table->mclk_num_points, arb->mclk_f_points)) {
nvgpu_err(g, "failed to fetch MCLK frequency points");
goto exit_vf_table;
}
if (!table->mclk_num_points || !table->gpc2clk_num_points) {
nvgpu_err(g, "empty queries to f points mclk %d gpc2clk %d",
table->mclk_num_points, table->gpc2clk_num_points);
status = -EINVAL;
goto exit_vf_table;
}
memset(table->mclk_points, 0,
table->mclk_num_points*sizeof(struct nvgpu_clk_vf_point));
memset(table->gpc2clk_points, 0,
table->gpc2clk_num_points*sizeof(struct nvgpu_clk_vf_point));
p5_info = pstate_get_clk_set_info(g,
CTRL_PERF_PSTATE_P5, clkwhich_mclk);
if (!p5_info) {
nvgpu_err(g, "failed to get MCLK P5 info");
goto exit_vf_table;
}
p0_info = pstate_get_clk_set_info(g,
CTRL_PERF_PSTATE_P0, clkwhich_mclk);
if (!p0_info) {
nvgpu_err(g, "failed to get MCLK P0 info");
goto exit_vf_table;
}
for (i = 0, j = 0, num_points = 0, clk_cur = 0;
i < table->mclk_num_points; i++) {
if ((arb->mclk_f_points[i] >= arb->mclk_min) &&
(arb->mclk_f_points[i] <= arb->mclk_max) &&
(arb->mclk_f_points[i] != clk_cur)) {
table->mclk_points[j].mem_mhz = arb->mclk_f_points[i];
mclk_voltuv = mclk_voltuv_sram = 0;
status = clk_domain_get_f_or_v(g, CTRL_CLK_DOMAIN_MCLK,
&table->mclk_points[j].mem_mhz, &mclk_voltuv,
CTRL_VOLT_DOMAIN_LOGIC);
if (status < 0) {
nvgpu_err(g,
"failed to get MCLK LOGIC voltage");
goto exit_vf_table;
}
status = clk_domain_get_f_or_v(g, CTRL_CLK_DOMAIN_MCLK,
&table->mclk_points[j].mem_mhz,
&mclk_voltuv_sram,
CTRL_VOLT_DOMAIN_SRAM);
if (status < 0) {
nvgpu_err(g, "failed to get MCLK SRAM voltage");
goto exit_vf_table;
}
table->mclk_points[j].uvolt = mclk_voltuv;
table->mclk_points[j].uvolt_sram = mclk_voltuv_sram;
clk_cur = table->mclk_points[j].mem_mhz;
if ((clk_cur >= p5_info->min_mhz) &&
(clk_cur <= p5_info->max_mhz))
VF_POINT_SET_PSTATE_SUPPORTED(
&table->mclk_points[j],
CTRL_PERF_PSTATE_P5);
if ((clk_cur >= p0_info->min_mhz) &&
(clk_cur <= p0_info->max_mhz))
VF_POINT_SET_PSTATE_SUPPORTED(
&table->mclk_points[j],
CTRL_PERF_PSTATE_P0);
j++;
num_points++;
}
}
table->mclk_num_points = num_points;
p5_info = pstate_get_clk_set_info(g,
CTRL_PERF_PSTATE_P5, clkwhich_gpc2clk);
if (!p5_info) {
status = -EINVAL;
nvgpu_err(g, "failed to get GPC2CLK P5 info");
goto exit_vf_table;
}
p0_info = pstate_get_clk_set_info(g,
CTRL_PERF_PSTATE_P0, clkwhich_gpc2clk);
if (!p0_info) {
status = -EINVAL;
nvgpu_err(g, "failed to get GPC2CLK P0 info");
goto exit_vf_table;
}
/* GPC2CLK needs to be checked in two passes. The first determines the
* relationships between GPC2CLK, SYS2CLK and XBAR2CLK, while the
* second verifies that the clocks minimum is satisfied and sets
* the voltages
*/
for (i = 0, j = 0, num_points = 0, clk_cur = 0;
i < table->gpc2clk_num_points; i++) {
struct set_fll_clk setfllclk;
if ((arb->gpc2clk_f_points[i] >= arb->gpc2clk_min) &&
(arb->gpc2clk_f_points[i] <= arb->gpc2clk_max) &&
(arb->gpc2clk_f_points[i] != clk_cur)) {
table->gpc2clk_points[j].gpc_mhz =
arb->gpc2clk_f_points[i];
setfllclk.gpc2clkmhz = arb->gpc2clk_f_points[i];
status = clk_get_fll_clks(g, &setfllclk);
if (status < 0) {
nvgpu_err(g,
"failed to get GPC2CLK slave clocks");
goto exit_vf_table;
}
table->gpc2clk_points[j].sys_mhz =
setfllclk.sys2clkmhz;
table->gpc2clk_points[j].xbar_mhz =
setfllclk.xbar2clkmhz;
clk_cur = table->gpc2clk_points[j].gpc_mhz;
if ((clk_cur >= p5_info->min_mhz) &&
(clk_cur <= p5_info->max_mhz))
VF_POINT_SET_PSTATE_SUPPORTED(
&table->gpc2clk_points[j],
CTRL_PERF_PSTATE_P5);
if ((clk_cur >= p0_info->min_mhz) &&
(clk_cur <= p0_info->max_mhz))
VF_POINT_SET_PSTATE_SUPPORTED(
&table->gpc2clk_points[j],
CTRL_PERF_PSTATE_P0);
j++;
num_points++;
}
}
table->gpc2clk_num_points = num_points;
/* Second pass */
for (i = 0, j = 0; i < table->gpc2clk_num_points; i++) {
u16 alt_gpc2clk = table->gpc2clk_points[i].gpc_mhz;
gpc2clk_voltuv = gpc2clk_voltuv_sram = 0;
/* Check sysclk */
p5_info = pstate_get_clk_set_info(g,
VF_POINT_GET_PSTATE(&table->gpc2clk_points[i]),
clkwhich_sys2clk);
if (!p5_info) {
status = -EINVAL;
nvgpu_err(g, "failed to get SYS2CLK P5 info");
goto exit_vf_table;
}
/* sys2clk below clk min, need to find correct clock */
if (table->gpc2clk_points[i].sys_mhz < p5_info->min_mhz) {
for (j = i + 1; j < table->gpc2clk_num_points; j++) {
if (table->gpc2clk_points[j].sys_mhz >=
p5_info->min_mhz) {
table->gpc2clk_points[i].sys_mhz =
p5_info->min_mhz;
alt_gpc2clk = alt_gpc2clk <
table->gpc2clk_points[j].
gpc_mhz ?
table->gpc2clk_points[j].
gpc_mhz :
alt_gpc2clk;
break;
}
}
/* no VF exists that satisfies condition */
if (j == table->gpc2clk_num_points) {
nvgpu_err(g, "NO SYS2CLK VF point possible");
status = -EINVAL;
goto exit_vf_table;
}
}
/* Check xbarclk */
p5_info = pstate_get_clk_set_info(g,
VF_POINT_GET_PSTATE(&table->gpc2clk_points[i]),
clkwhich_xbar2clk);
if (!p5_info) {
status = -EINVAL;
nvgpu_err(g, "failed to get SYS2CLK P5 info");
goto exit_vf_table;
}
/* xbar2clk below clk min, need to find correct clock */
if (table->gpc2clk_points[i].xbar_mhz < p5_info->min_mhz) {
for (j = i; j < table->gpc2clk_num_points; j++) {
if (table->gpc2clk_points[j].xbar_mhz >=
p5_info->min_mhz) {
table->gpc2clk_points[i].xbar_mhz =
p5_info->min_mhz;
alt_gpc2clk = alt_gpc2clk <
table->gpc2clk_points[j].
gpc_mhz ?
table->gpc2clk_points[j].
gpc_mhz :
alt_gpc2clk;
break;
}
}
/* no VF exists that satisfies condition */
if (j == table->gpc2clk_num_points) {
status = -EINVAL;
nvgpu_err(g, "NO XBAR2CLK VF point possible");
goto exit_vf_table;
}
}
/* Calculate voltages */
status = clk_domain_get_f_or_v(g, CTRL_CLK_DOMAIN_GPC2CLK,
&alt_gpc2clk, &gpc2clk_voltuv,
CTRL_VOLT_DOMAIN_LOGIC);
if (status < 0) {
nvgpu_err(g, "failed to get GPC2CLK LOGIC voltage");
goto exit_vf_table;
}
status = clk_domain_get_f_or_v(g, CTRL_CLK_DOMAIN_GPC2CLK,
&alt_gpc2clk,
&gpc2clk_voltuv_sram,
CTRL_VOLT_DOMAIN_SRAM);
if (status < 0) {
nvgpu_err(g, "failed to get GPC2CLK SRAM voltage");
goto exit_vf_table;
}
table->gpc2clk_points[i].uvolt = gpc2clk_voltuv;
table->gpc2clk_points[i].uvolt_sram = gpc2clk_voltuv_sram;
}
/* make table visible when all data has resolved in the tables */
nvgpu_smp_wmb();
xchg(&arb->current_vf_table, table);
exit_vf_table:
if (status < 0)
nvgpu_clk_arb_set_global_alarm(g,
EVENT(ALARM_VF_TABLE_UPDATE_FAILED));
if (arb->update_work_queue)
queue_work(arb->update_work_queue, &arb->update_fn_work);
return status;
}
static void nvgpu_clk_arb_run_vf_table_cb(struct work_struct *work)
{
struct nvgpu_clk_arb *arb =
container_of(work, struct nvgpu_clk_arb, vf_table_fn_work);
struct gk20a *g = arb->g;
u32 err;
/* get latest vf curve from pmu */
err = clk_vf_point_cache(g);
if (err) {
nvgpu_err(g, "failed to cache VF table");
nvgpu_clk_arb_set_global_alarm(g,
EVENT(ALARM_VF_TABLE_UPDATE_FAILED));
if (arb->update_work_queue)
queue_work(arb->update_work_queue,
&arb->update_fn_work);
return;
}
nvgpu_clk_arb_update_vf_table(arb);
}
static u8 nvgpu_clk_arb_find_vf_point(struct nvgpu_clk_arb *arb,
u16 *gpc2clk, u16 *sys2clk, u16 *xbar2clk, u16 *mclk,
u32 *voltuv, u32 *voltuv_sram, u32 *nuvmin, u32 *nuvmin_sram)
{
u16 gpc2clk_target, mclk_target;
u32 gpc2clk_voltuv, gpc2clk_voltuv_sram;
u32 mclk_voltuv, mclk_voltuv_sram;
u32 pstate = VF_POINT_INVALID_PSTATE;
struct nvgpu_clk_vf_table *table;
u32 index, index_mclk;
struct nvgpu_clk_vf_point *mclk_vf = NULL;
do {
gpc2clk_target = *gpc2clk;
mclk_target = *mclk;
gpc2clk_voltuv = 0;
gpc2clk_voltuv_sram = 0;
mclk_voltuv = 0;
mclk_voltuv_sram = 0;
table = NV_ACCESS_ONCE(arb->current_vf_table);
/* pointer to table can be updated by callback */
nvgpu_smp_rmb();
if (!table)
continue;
if ((!table->gpc2clk_num_points) || (!table->mclk_num_points)) {
nvgpu_err(arb->g, "found empty table");
goto find_exit;
}
/* First we check MCLK to find out which PSTATE we are
* are requesting, and from there try to find the minimum
* GPC2CLK on the same PSTATE that satisfies the request.
* If no GPC2CLK can be found, then we need to up the PSTATE
*/
recalculate_vf_point:
for (index = 0; index < table->mclk_num_points; index++) {
if (table->mclk_points[index].mem_mhz >= mclk_target) {
mclk_vf = &table->mclk_points[index];
break;
}
}
if (index == table->mclk_num_points) {
mclk_vf = &table->mclk_points[index-1];
index = table->mclk_num_points - 1;
}
index_mclk = index;
/* round up the freq requests */
for (index = 0; index < table->gpc2clk_num_points; index++) {
pstate = VF_POINT_COMMON_PSTATE(
&table->gpc2clk_points[index], mclk_vf);
if ((table->gpc2clk_points[index].gpc_mhz >=
gpc2clk_target) &&
(pstate != VF_POINT_INVALID_PSTATE)) {
gpc2clk_target =
table->gpc2clk_points[index].gpc_mhz;
*sys2clk =
table->gpc2clk_points[index].sys_mhz;
*xbar2clk =
table->gpc2clk_points[index].xbar_mhz;
gpc2clk_voltuv =
table->gpc2clk_points[index].uvolt;
gpc2clk_voltuv_sram =
table->gpc2clk_points[index].uvolt_sram;
break;
}
}
if (index == table->gpc2clk_num_points) {
pstate = VF_POINT_COMMON_PSTATE(
&table->gpc2clk_points[index-1], mclk_vf);
if (pstate != VF_POINT_INVALID_PSTATE) {
gpc2clk_target =
table->gpc2clk_points[index-1].gpc_mhz;
*sys2clk =
table->gpc2clk_points[index-1].sys_mhz;
*xbar2clk =
table->gpc2clk_points[index-1].xbar_mhz;
gpc2clk_voltuv =
table->gpc2clk_points[index-1].uvolt;
gpc2clk_voltuv_sram =
table->gpc2clk_points[index-1].
uvolt_sram;
} else if (index_mclk >= table->mclk_num_points - 1) {
/* There is no available combination of MCLK
* and GPC2CLK, we need to fail this
*/
gpc2clk_target = 0;
mclk_target = 0;
pstate = VF_POINT_INVALID_PSTATE;
goto find_exit;
} else {
/* recalculate with higher PSTATE */
gpc2clk_target = *gpc2clk;
mclk_target = table->mclk_points[index_mclk+1].
mem_mhz;
goto recalculate_vf_point;
}
}
mclk_target = mclk_vf->mem_mhz;
mclk_voltuv = mclk_vf->uvolt;
mclk_voltuv_sram = mclk_vf->uvolt_sram;
} while (!table ||
(NV_ACCESS_ONCE(arb->current_vf_table) != table));
find_exit:
*voltuv = gpc2clk_voltuv > mclk_voltuv ? gpc2clk_voltuv : mclk_voltuv;
*voltuv_sram = gpc2clk_voltuv_sram > mclk_voltuv_sram ?
gpc2clk_voltuv_sram : mclk_voltuv_sram;
/* noise unaware vmin */
*nuvmin = mclk_voltuv;
*nuvmin_sram = mclk_voltuv_sram;
*gpc2clk = gpc2clk_target < *gpc2clk ? gpc2clk_target : *gpc2clk;
*mclk = mclk_target;
return pstate;
}
static int nvgpu_clk_arb_change_vf_point(struct gk20a *g, u16 gpc2clk_target,
u16 sys2clk_target, u16 xbar2clk_target, u16 mclk_target, u32 voltuv,
u32 voltuv_sram)
{
struct set_fll_clk fllclk;
struct nvgpu_clk_arb *arb = g->clk_arb;
int status;
fllclk.gpc2clkmhz = gpc2clk_target;
fllclk.sys2clkmhz = sys2clk_target;
fllclk.xbar2clkmhz = xbar2clk_target;
fllclk.voltuv = voltuv;
/* if voltage ascends we do:
* (1) FLL change
* (2) Voltage change
* (3) MCLK change
* If it goes down
* (1) MCLK change
* (2) Voltage change
* (3) FLL change
*/
/* descending */
if (voltuv < arb->voltuv_actual) {
status = g->ops.clk.mclk_change(g, mclk_target);
if (status < 0)
return status;
status = volt_set_voltage(g, voltuv, voltuv_sram);
if (status < 0)
return status;
status = clk_set_fll_clks(g, &fllclk);
if (status < 0)
return status;
} else {
status = clk_set_fll_clks(g, &fllclk);
if (status < 0)
return status;
status = volt_set_voltage(g, voltuv, voltuv_sram);
if (status < 0)
return status;
status = g->ops.clk.mclk_change(g, mclk_target);
if (status < 0)
return status;
}
return 0;
}
static u32 nvgpu_clk_arb_notify(struct nvgpu_clk_dev *dev,
struct nvgpu_clk_arb_target *target,
u32 alarm) {
struct nvgpu_clk_session *session = dev->session;
struct nvgpu_clk_arb *arb = session->g->clk_arb;
struct nvgpu_clk_notification *notification;
u32 queue_alarm_mask = 0;
u32 enabled_mask = 0;
u32 new_alarms_reported = 0;
u32 poll_mask = 0;
u32 tail, head;
u32 queue_index;
size_t size;
int index;
enabled_mask = nvgpu_atomic_read(&dev->enabled_mask);
size = arb->notification_queue.size;
/* queue global arbiter notifications in buffer */
do {
tail = nvgpu_atomic_read(&arb->notification_queue.tail);
/* copy items to the queue */
queue_index = nvgpu_atomic_read(&dev->queue.tail);
head = dev->arb_queue_head;
head = (tail - head) < arb->notification_queue.size ?
head : tail - arb->notification_queue.size;
for (index = head; _WRAPGTEQ(tail, index); index++) {
u32 alarm_detected;
notification = &arb->notification_queue.
notifications[(index+1) % size];
alarm_detected =
NV_ACCESS_ONCE(notification->notification);
if (!(enabled_mask & alarm_detected))
continue;
queue_index++;
dev->queue.notifications[
queue_index % dev->queue.size].timestamp =
NV_ACCESS_ONCE(notification->timestamp);
dev->queue.notifications[
queue_index % dev->queue.size].notification =
alarm_detected;
queue_alarm_mask |= alarm_detected;
}
} while (unlikely(nvgpu_atomic_read(&arb->notification_queue.tail) !=
(int)tail));
nvgpu_atomic_set(&dev->queue.tail, queue_index);
/* update the last notification we processed from global queue */
dev->arb_queue_head = tail;
/* Check if current session targets are met */
if (enabled_mask & EVENT(ALARM_LOCAL_TARGET_VF_NOT_POSSIBLE)) {
if ((target->gpc2clk < session->target->gpc2clk)
|| (target->mclk < session->target->mclk)) {
poll_mask |= (NVGPU_POLLIN | NVGPU_POLLPRI);
nvgpu_clk_arb_queue_notification(arb->g, &dev->queue,
EVENT(ALARM_LOCAL_TARGET_VF_NOT_POSSIBLE));
}
}
/* Check if there is a new VF update */
if (queue_alarm_mask & EVENT(VF_UPDATE))
poll_mask |= (NVGPU_POLLIN | NVGPU_POLLRDNORM);
/* Notify sticky alarms that were not reported on previous run*/
new_alarms_reported = (queue_alarm_mask |
(alarm & ~dev->alarms_reported & queue_alarm_mask));
if (new_alarms_reported & ~LOCAL_ALARM_MASK) {
/* check that we are not re-reporting */
if (new_alarms_reported & EVENT(ALARM_GPU_LOST))
poll_mask |= NVGPU_POLLHUP;
poll_mask |= (NVGPU_POLLIN | NVGPU_POLLPRI);
/* On next run do not report global alarms that were already
* reported, but report SHUTDOWN always
*/
dev->alarms_reported = new_alarms_reported & ~LOCAL_ALARM_MASK &
~EVENT(ALARM_GPU_LOST);
}
if (poll_mask) {
nvgpu_atomic_set(&dev->poll_mask, poll_mask);
nvgpu_cond_broadcast_interruptible(&dev->readout_wq);
}
return new_alarms_reported;
}
static void nvgpu_clk_arb_clear_global_alarm(struct gk20a *g, u32 alarm)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
u64 current_mask;
u32 refcnt;
u32 alarm_mask;
u64 new_mask;
do {
current_mask = nvgpu_atomic64_read(&arb->alarm_mask);
/* atomic operations are strong so they do not need masks */
refcnt = ((u32) (current_mask >> 32)) + 1;
alarm_mask = (u32) (current_mask & ~alarm);
new_mask = ((u64) refcnt << 32) | alarm_mask;
} while (unlikely(current_mask !=
(u64)nvgpu_atomic64_cmpxchg(&arb->alarm_mask,
current_mask, new_mask)));
}
static void nvgpu_clk_arb_run_arbiter_cb(struct work_struct *work)
{
struct nvgpu_clk_arb *arb =
container_of(work, struct nvgpu_clk_arb, update_fn_work);
struct nvgpu_clk_session *session;
struct nvgpu_clk_dev *dev;
struct nvgpu_clk_dev *tmp;
struct nvgpu_clk_arb_target *target, *actual;
struct gk20a *g = arb->g;
struct llist_node *head;
u32 pstate = VF_POINT_INVALID_PSTATE;
u32 voltuv, voltuv_sram;
bool mclk_set, gpc2clk_set;
u32 nuvmin, nuvmin_sram;
u32 alarms_notified = 0;
u32 current_alarm;
int status = 0;
/* Temporary variables for checking target frequency */
u16 gpc2clk_target, sys2clk_target, xbar2clk_target, mclk_target;
u16 gpc2clk_session_target, mclk_session_target;
#ifdef CONFIG_DEBUG_FS
u64 t0, t1;
struct nvgpu_clk_arb_debug *debug;
#endif
nvgpu_log(g, gpu_dbg_fn | gpu_dbg_clk_arb, " ");
/* bail out if gpu is down */
if (nvgpu_atomic64_read(&arb->alarm_mask) & EVENT(ALARM_GPU_LOST))
goto exit_arb;
#ifdef CONFIG_DEBUG_FS
g->ops.bus.read_ptimer(g, &t0);
#endif
/* Only one arbiter should be running */
gpc2clk_target = 0;
mclk_target = 0;
rcu_read_lock();
list_for_each_entry_rcu(session, &arb->sessions, link) {
if (!session->zombie) {
mclk_set = false;
gpc2clk_set = false;
target = NV_ACCESS_ONCE(session->target) ==
&session->target_pool[0] ?
&session->target_pool[1] :
&session->target_pool[0];
/* Do not reorder pointer */
nvgpu_smp_rmb();
head = llist_del_all(&session->targets);
if (head) {
/* Copy over state */
target->mclk = session->target->mclk;
target->gpc2clk = session->target->gpc2clk;
/* Query the latest committed request */
llist_for_each_entry_safe(dev, tmp, head,
node) {
if (!mclk_set && dev->mclk_target_mhz) {
target->mclk =
dev->mclk_target_mhz;
mclk_set = true;
}
if (!gpc2clk_set &&
dev->gpc2clk_target_mhz) {
target->gpc2clk =
dev->gpc2clk_target_mhz;
gpc2clk_set = true;
}
nvgpu_ref_get(&dev->refcount);
llist_add(&dev->node, &arb->requests);
}
/* Ensure target is updated before ptr sawp */
nvgpu_smp_wmb();
xchg(&session->target, target);
}
mclk_target = mclk_target > session->target->mclk ?
mclk_target : session->target->mclk;
gpc2clk_target =
gpc2clk_target > session->target->gpc2clk ?
gpc2clk_target : session->target->gpc2clk;
}
}
rcu_read_unlock();
gpc2clk_target = (gpc2clk_target > 0) ? gpc2clk_target :
arb->gpc2clk_default_mhz;
if (gpc2clk_target < arb->gpc2clk_min)
gpc2clk_target = arb->gpc2clk_min;
if (gpc2clk_target > arb->gpc2clk_max)
gpc2clk_target = arb->gpc2clk_max;
mclk_target = (mclk_target > 0) ? mclk_target :
arb->mclk_default_mhz;
if (mclk_target < arb->mclk_min)
mclk_target = arb->mclk_min;
if (mclk_target > arb->mclk_max)
mclk_target = arb->mclk_max;
sys2clk_target = 0;
xbar2clk_target = 0;
gpc2clk_session_target = gpc2clk_target;
mclk_session_target = mclk_target;
/* Query the table for the closest vf point to program */
pstate = nvgpu_clk_arb_find_vf_point(arb, &gpc2clk_target,
&sys2clk_target, &xbar2clk_target, &mclk_target, &voltuv,
&voltuv_sram, &nuvmin, &nuvmin_sram);
if (pstate == VF_POINT_INVALID_PSTATE) {
arb->status = -EINVAL;
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
if ((gpc2clk_target < gpc2clk_session_target) ||
(mclk_target < mclk_session_target))
nvgpu_clk_arb_set_global_alarm(g,
EVENT(ALARM_TARGET_VF_NOT_POSSIBLE));
if ((arb->actual->gpc2clk == gpc2clk_target) &&
(arb->actual->mclk == mclk_target) &&
(arb->voltuv_actual == voltuv)) {
goto exit_arb;
}
/* Program clocks */
/* A change in both mclk of gpc2clk may require a change in voltage */
nvgpu_mutex_acquire(&arb->pstate_lock);
status = nvgpu_lpwr_disable_pg(g, false);
status = clk_pmu_freq_controller_load(g, false,
CTRL_CLK_CLK_FREQ_CONTROLLER_ID_ALL);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
status = volt_set_noiseaware_vmin(g, nuvmin, nuvmin_sram);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
status = nvgpu_clk_arb_change_vf_point(g, gpc2clk_target,
sys2clk_target, xbar2clk_target, mclk_target, voltuv,
voltuv_sram);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
status = clk_pmu_freq_controller_load(g, true,
CTRL_CLK_CLK_FREQ_CONTROLLER_ID_ALL);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
status = nvgpu_lwpr_mclk_change(g, pstate);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
actual = NV_ACCESS_ONCE(arb->actual) == &arb->actual_pool[0] ?
&arb->actual_pool[1] : &arb->actual_pool[0];
/* do not reorder this pointer */
nvgpu_smp_rmb();
actual->gpc2clk = gpc2clk_target;
actual->mclk = mclk_target;
arb->voltuv_actual = voltuv;
actual->pstate = pstate;
arb->status = status;
/* Make changes visible to other threads */
nvgpu_smp_wmb();
xchg(&arb->actual, actual);
status = nvgpu_lpwr_enable_pg(g, false);
if (status < 0) {
arb->status = status;
nvgpu_mutex_release(&arb->pstate_lock);
/* make status visible */
nvgpu_smp_mb();
goto exit_arb;
}
/* status must be visible before atomic inc */
nvgpu_smp_wmb();
nvgpu_atomic_inc(&arb->req_nr);
/* Unlock pstate change for PG */
nvgpu_mutex_release(&arb->pstate_lock);
/* VF Update complete */
nvgpu_clk_arb_set_global_alarm(g, EVENT(VF_UPDATE));
nvgpu_cond_signal_interruptible(&arb->request_wq);
#ifdef CONFIG_DEBUG_FS
g->ops.bus.read_ptimer(g, &t1);
debug = arb->debug == &arb->debug_pool[0] ?
&arb->debug_pool[1] : &arb->debug_pool[0];
memcpy(debug, arb->debug, sizeof(arb->debug_pool[0]));
debug->switch_num++;
if (debug->switch_num == 1) {
debug->switch_max = debug->switch_min =
debug->switch_avg = (t1-t0)/1000;
debug->switch_std = 0;
} else {
s64 prev_avg;
s64 curr = (t1-t0)/1000;
debug->switch_max = curr > debug->switch_max ?
curr : debug->switch_max;
debug->switch_min = debug->switch_min ?
(curr < debug->switch_min ?
curr : debug->switch_min) : curr;
prev_avg = debug->switch_avg;
debug->switch_avg = (curr +
(debug->switch_avg * (debug->switch_num-1))) /
debug->switch_num;
debug->switch_std +=
(curr - debug->switch_avg) * (curr - prev_avg);
}
/* commit changes before exchanging debug pointer */
nvgpu_smp_wmb();
xchg(&arb->debug, debug);
#endif
exit_arb:
if (status < 0) {
nvgpu_err(g, "Error in arbiter update");
nvgpu_clk_arb_set_global_alarm(g,
EVENT(ALARM_CLOCK_ARBITER_FAILED));
}
current_alarm = (u32) nvgpu_atomic64_read(&arb->alarm_mask);
/* notify completion for all requests */
head = llist_del_all(&arb->requests);
llist_for_each_entry_safe(dev, tmp, head, node) {
nvgpu_atomic_set(&dev->poll_mask, NVGPU_POLLIN | NVGPU_POLLRDNORM);
nvgpu_cond_signal_interruptible(&dev->readout_wq);
nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
}
nvgpu_atomic_set(&arb->notification_queue.head,
nvgpu_atomic_read(&arb->notification_queue.tail));
/* notify event for all users */
rcu_read_lock();
list_for_each_entry_rcu(dev, &arb->users, link) {
alarms_notified |=
nvgpu_clk_arb_notify(dev, arb->actual, current_alarm);
}
rcu_read_unlock();
/* clear alarms */
nvgpu_clk_arb_clear_global_alarm(g, alarms_notified &
~EVENT(ALARM_GPU_LOST));
}
int nvgpu_clk_arb_init_arbiter(struct gk20a *g)
{
struct nvgpu_clk_arb *arb;
u16 default_mhz;
int err;
int index;
struct nvgpu_clk_vf_table *table;
nvgpu_log(g, gpu_dbg_fn | gpu_dbg_clk_arb, " ");
if (!g->ops.clk_arb.get_arbiter_clk_domains)
return 0;
arb = nvgpu_kzalloc(g, sizeof(struct nvgpu_clk_arb));
if (!arb)
return -ENOMEM;
err = nvgpu_mutex_init(&arb->pstate_lock);
if (err)
goto mutex_fail;
nvgpu_spinlock_init(&arb->sessions_lock);
nvgpu_spinlock_init(&arb->users_lock);
arb->mclk_f_points = nvgpu_kcalloc(g, MAX_F_POINTS, sizeof(u16));
if (!arb->mclk_f_points) {
err = -ENOMEM;
goto init_fail;
}
arb->gpc2clk_f_points = nvgpu_kcalloc(g, MAX_F_POINTS, sizeof(u16));
if (!arb->gpc2clk_f_points) {
err = -ENOMEM;
goto init_fail;
}
for (index = 0; index < 2; index++) {
table = &arb->vf_table_pool[index];
table->gpc2clk_num_points = MAX_F_POINTS;
table->mclk_num_points = MAX_F_POINTS;
table->gpc2clk_points = nvgpu_kcalloc(g, MAX_F_POINTS,
sizeof(struct nvgpu_clk_vf_point));
if (!table->gpc2clk_points) {
err = -ENOMEM;
goto init_fail;
}
table->mclk_points = nvgpu_kcalloc(g, MAX_F_POINTS,
sizeof(struct nvgpu_clk_vf_point));
if (!table->mclk_points) {
err = -ENOMEM;
goto init_fail;
}
}
g->clk_arb = arb;
arb->g = g;
err = g->ops.clk_arb.get_arbiter_clk_default(g,
CTRL_CLK_DOMAIN_MCLK, &default_mhz);
if (err < 0) {
err = -EINVAL;
goto init_fail;
}
arb->mclk_default_mhz = default_mhz;
err = g->ops.clk_arb.get_arbiter_clk_default(g,
CTRL_CLK_DOMAIN_GPC2CLK, &default_mhz);
if (err < 0) {
err = -EINVAL;
goto init_fail;
}
arb->gpc2clk_default_mhz = default_mhz;
arb->actual = &arb->actual_pool[0];
nvgpu_atomic_set(&arb->req_nr, 0);
nvgpu_atomic64_set(&arb->alarm_mask, 0);
err = nvgpu_clk_notification_queue_alloc(g, &arb->notification_queue,
DEFAULT_EVENT_NUMBER);
if (err < 0)
goto init_fail;
INIT_LIST_HEAD_RCU(&arb->users);
INIT_LIST_HEAD_RCU(&arb->sessions);
init_llist_head(&arb->requests);
nvgpu_cond_init(&arb->request_wq);
arb->vf_table_work_queue = alloc_workqueue("%s", WQ_HIGHPRI, 1,
"vf_table_update");
arb->update_work_queue = alloc_workqueue("%s", WQ_HIGHPRI, 1,
"arbiter_update");
INIT_WORK(&arb->vf_table_fn_work, nvgpu_clk_arb_run_vf_table_cb);
INIT_WORK(&arb->update_fn_work, nvgpu_clk_arb_run_arbiter_cb);
#ifdef CONFIG_DEBUG_FS
arb->debug = &arb->debug_pool[0];
if (!arb->debugfs_set) {
if (nvgpu_clk_arb_debugfs_init(g))
arb->debugfs_set = true;
}
#endif
err = clk_vf_point_cache(g);
if (err < 0)
goto init_fail;
err = nvgpu_clk_arb_update_vf_table(arb);
if (err < 0)
goto init_fail;
do {
/* Check that first run is completed */
nvgpu_smp_mb();
NVGPU_COND_WAIT_INTERRUPTIBLE(&arb->request_wq,
nvgpu_atomic_read(&arb->req_nr), 0);
} while (!nvgpu_atomic_read(&arb->req_nr));
return arb->status;
init_fail:
nvgpu_kfree(g, arb->gpc2clk_f_points);
nvgpu_kfree(g, arb->mclk_f_points);
for (index = 0; index < 2; index++) {
nvgpu_kfree(g, arb->vf_table_pool[index].gpc2clk_points);
nvgpu_kfree(g, arb->vf_table_pool[index].mclk_points);
}
nvgpu_mutex_destroy(&arb->pstate_lock);
mutex_fail:
nvgpu_kfree(g, arb);
return err;
}
void nvgpu_clk_arb_send_thermal_alarm(struct gk20a *g)
{
nvgpu_clk_arb_schedule_alarm(g,
(0x1UL << NVGPU_EVENT_ALARM_THERMAL_ABOVE_THRESHOLD));
}
void nvgpu_clk_arb_schedule_alarm(struct gk20a *g, u32 alarm)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
nvgpu_clk_arb_set_global_alarm(g, alarm);
if (arb->update_work_queue)
queue_work(arb->update_work_queue, &arb->update_fn_work);
}
void nvgpu_clk_arb_cleanup_arbiter(struct gk20a *g)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
int index;
if (arb) {
cancel_work_sync(&arb->vf_table_fn_work);
destroy_workqueue(arb->vf_table_work_queue);
arb->vf_table_work_queue = NULL;
cancel_work_sync(&arb->update_fn_work);
destroy_workqueue(arb->update_work_queue);
arb->update_work_queue = NULL;
nvgpu_kfree(g, arb->gpc2clk_f_points);
nvgpu_kfree(g, arb->mclk_f_points);
for (index = 0; index < 2; index++) {
nvgpu_kfree(g,
arb->vf_table_pool[index].gpc2clk_points);
nvgpu_kfree(g, arb->vf_table_pool[index].mclk_points);
}
nvgpu_mutex_destroy(&g->clk_arb->pstate_lock);
nvgpu_kfree(g, g->clk_arb);
g->clk_arb = NULL;
}
}
int nvgpu_clk_arb_init_session(struct gk20a *g,
struct nvgpu_clk_session **_session)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
struct nvgpu_clk_session *session = *(_session);
nvgpu_log(g, gpu_dbg_fn | gpu_dbg_clk_arb, " ");
if (!g->ops.clk_arb.get_arbiter_clk_domains)
return 0;
session = nvgpu_kzalloc(g, sizeof(struct nvgpu_clk_session));
if (!session)
return -ENOMEM;
session->g = g;
nvgpu_ref_init(&session->refcount);
session->zombie = false;
session->target_pool[0].pstate = CTRL_PERF_PSTATE_P8;
/* make sure that the initialization of the pool is visible
* before the update
*/
nvgpu_smp_wmb();
session->target = &session->target_pool[0];
init_llist_head(&session->targets);
nvgpu_spinlock_acquire(&arb->sessions_lock);
list_add_tail_rcu(&session->link, &arb->sessions);
nvgpu_spinlock_release(&arb->sessions_lock);
*_session = session;
return 0;
}
void nvgpu_clk_arb_free_fd(struct nvgpu_ref *refcount)
{
struct nvgpu_clk_dev *dev = container_of(refcount,
struct nvgpu_clk_dev, refcount);
struct nvgpu_clk_session *session = dev->session;
nvgpu_kfree(session->g, dev);
}
void nvgpu_clk_arb_free_session(struct nvgpu_ref *refcount)
{
struct nvgpu_clk_session *session = container_of(refcount,
struct nvgpu_clk_session, refcount);
struct nvgpu_clk_arb *arb = session->g->clk_arb;
struct gk20a *g = session->g;
struct nvgpu_clk_dev *dev, *tmp;
struct llist_node *head;
nvgpu_log(g, gpu_dbg_fn | gpu_dbg_clk_arb, " ");
if (arb) {
nvgpu_spinlock_acquire(&arb->sessions_lock);
list_del_rcu(&session->link);
nvgpu_spinlock_release(&arb->sessions_lock);
}
head = llist_del_all(&session->targets);
llist_for_each_entry_safe(dev, tmp, head, node) {
nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
}
synchronize_rcu();
nvgpu_kfree(g, session);
}
void nvgpu_clk_arb_release_session(struct gk20a *g,
struct nvgpu_clk_session *session)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
nvgpu_log(g, gpu_dbg_fn | gpu_dbg_clk_arb, " ");
session->zombie = true;
nvgpu_ref_put(&session->refcount, nvgpu_clk_arb_free_session);
if (arb && arb->update_work_queue)
queue_work(arb->update_work_queue, &arb->update_fn_work);
}
void nvgpu_clk_arb_schedule_vf_table_update(struct gk20a *g)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
if (arb->vf_table_work_queue)
queue_work(arb->vf_table_work_queue, &arb->vf_table_fn_work);
}
/* This function is inherently unsafe to call while arbiter is running
* arbiter must be blocked before calling this function
*/
int nvgpu_clk_arb_get_current_pstate(struct gk20a *g)
{
return NV_ACCESS_ONCE(g->clk_arb->actual->pstate);
}
void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock)
{
struct nvgpu_clk_arb *arb = g->clk_arb;
if (lock)
nvgpu_mutex_acquire(&arb->pstate_lock);
else
nvgpu_mutex_release(&arb->pstate_lock);
}