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linux-next/drivers/gpu/drm/vc4/vc4_v3d.c
Eric Anholt 3a62234680 drm/vc4: Use runtime autosuspend to avoid thrashing V3D power state. 
The pm_runtime_put() we were using immediately released power on the
device, which meant that we were generally turning the device off and
on once per frame.  In many profiles I've looked at, that added up to
about 1% of CPU time, but this could get worse in the case of frequent
rendering and readback (as may happen in X rendering).  By keeping the
device on until we've been idle for a couple of frames, we drop the
overhead of runtime PM down to sub-.1%.

Signed-off-by: Eric Anholt <eric@anholt.net>
2016-11-04 16:12:35 -07:00

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/*
* Copyright (c) 2014 The Linux Foundation. All rights reserved.
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "linux/component.h"
#include "linux/pm_runtime.h"
#include "vc4_drv.h"
#include "vc4_regs.h"
#ifdef CONFIG_DEBUG_FS
#define REGDEF(reg) { reg, #reg }
static const struct {
uint32_t reg;
const char *name;
} vc4_reg_defs[] = {
REGDEF(V3D_IDENT0),
REGDEF(V3D_IDENT1),
REGDEF(V3D_IDENT2),
REGDEF(V3D_SCRATCH),
REGDEF(V3D_L2CACTL),
REGDEF(V3D_SLCACTL),
REGDEF(V3D_INTCTL),
REGDEF(V3D_INTENA),
REGDEF(V3D_INTDIS),
REGDEF(V3D_CT0CS),
REGDEF(V3D_CT1CS),
REGDEF(V3D_CT0EA),
REGDEF(V3D_CT1EA),
REGDEF(V3D_CT0CA),
REGDEF(V3D_CT1CA),
REGDEF(V3D_CT00RA0),
REGDEF(V3D_CT01RA0),
REGDEF(V3D_CT0LC),
REGDEF(V3D_CT1LC),
REGDEF(V3D_CT0PC),
REGDEF(V3D_CT1PC),
REGDEF(V3D_PCS),
REGDEF(V3D_BFC),
REGDEF(V3D_RFC),
REGDEF(V3D_BPCA),
REGDEF(V3D_BPCS),
REGDEF(V3D_BPOA),
REGDEF(V3D_BPOS),
REGDEF(V3D_BXCF),
REGDEF(V3D_SQRSV0),
REGDEF(V3D_SQRSV1),
REGDEF(V3D_SQCNTL),
REGDEF(V3D_SRQPC),
REGDEF(V3D_SRQUA),
REGDEF(V3D_SRQUL),
REGDEF(V3D_SRQCS),
REGDEF(V3D_VPACNTL),
REGDEF(V3D_VPMBASE),
REGDEF(V3D_PCTRC),
REGDEF(V3D_PCTRE),
REGDEF(V3D_PCTR0),
REGDEF(V3D_PCTRS0),
REGDEF(V3D_PCTR1),
REGDEF(V3D_PCTRS1),
REGDEF(V3D_PCTR2),
REGDEF(V3D_PCTRS2),
REGDEF(V3D_PCTR3),
REGDEF(V3D_PCTRS3),
REGDEF(V3D_PCTR4),
REGDEF(V3D_PCTRS4),
REGDEF(V3D_PCTR5),
REGDEF(V3D_PCTRS5),
REGDEF(V3D_PCTR6),
REGDEF(V3D_PCTRS6),
REGDEF(V3D_PCTR7),
REGDEF(V3D_PCTRS7),
REGDEF(V3D_PCTR8),
REGDEF(V3D_PCTRS8),
REGDEF(V3D_PCTR9),
REGDEF(V3D_PCTRS9),
REGDEF(V3D_PCTR10),
REGDEF(V3D_PCTRS10),
REGDEF(V3D_PCTR11),
REGDEF(V3D_PCTRS11),
REGDEF(V3D_PCTR12),
REGDEF(V3D_PCTRS12),
REGDEF(V3D_PCTR13),
REGDEF(V3D_PCTRS13),
REGDEF(V3D_PCTR14),
REGDEF(V3D_PCTRS14),
REGDEF(V3D_PCTR15),
REGDEF(V3D_PCTRS15),
REGDEF(V3D_DBGE),
REGDEF(V3D_FDBGO),
REGDEF(V3D_FDBGB),
REGDEF(V3D_FDBGR),
REGDEF(V3D_FDBGS),
REGDEF(V3D_ERRSTAT),
};
int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *)m->private;
struct drm_device *dev = node->minor->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
int i;
for (i = 0; i < ARRAY_SIZE(vc4_reg_defs); i++) {
seq_printf(m, "%s (0x%04x): 0x%08x\n",
vc4_reg_defs[i].name, vc4_reg_defs[i].reg,
V3D_READ(vc4_reg_defs[i].reg));
}
return 0;
}
int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *)m->private;
struct drm_device *dev = node->minor->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
uint32_t ident1 = V3D_READ(V3D_IDENT1);
uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
seq_printf(m, "Revision: %d\n",
VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
seq_printf(m, "Slices: %d\n", nslc);
seq_printf(m, "TMUs: %d\n", nslc * tups);
seq_printf(m, "QPUs: %d\n", nslc * qups);
seq_printf(m, "Semaphores: %d\n",
VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static void vc4_v3d_init_hw(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
/* Take all the memory that would have been reserved for user
* QPU programs, since we don't have an interface for running
* them, anyway.
*/
V3D_WRITE(V3D_VPMBASE, 0);
}
#ifdef CONFIG_PM
static int vc4_v3d_runtime_suspend(struct device *dev)
{
struct vc4_v3d *v3d = dev_get_drvdata(dev);
struct vc4_dev *vc4 = v3d->vc4;
vc4_irq_uninstall(vc4->dev);
return 0;
}
static int vc4_v3d_runtime_resume(struct device *dev)
{
struct vc4_v3d *v3d = dev_get_drvdata(dev);
struct vc4_dev *vc4 = v3d->vc4;
vc4_v3d_init_hw(vc4->dev);
vc4_irq_postinstall(vc4->dev);
return 0;
}
#endif
static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct drm_device *drm = dev_get_drvdata(master);
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_v3d *v3d = NULL;
int ret;
v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
if (!v3d)
return -ENOMEM;
dev_set_drvdata(dev, v3d);
v3d->pdev = pdev;
v3d->regs = vc4_ioremap_regs(pdev, 0);
if (IS_ERR(v3d->regs))
return PTR_ERR(v3d->regs);
vc4->v3d = v3d;
v3d->vc4 = vc4;
if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
return -EINVAL;
}
/* Reset the binner overflow address/size at setup, to be sure
* we don't reuse an old one.
*/
V3D_WRITE(V3D_BPOA, 0);
V3D_WRITE(V3D_BPOS, 0);
vc4_v3d_init_hw(drm);
ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
if (ret) {
DRM_ERROR("Failed to install IRQ handler\n");
return ret;
}
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
pm_runtime_enable(dev);
return 0;
}
static void vc4_v3d_unbind(struct device *dev, struct device *master,
void *data)
{
struct drm_device *drm = dev_get_drvdata(master);
struct vc4_dev *vc4 = to_vc4_dev(drm);
pm_runtime_disable(dev);
drm_irq_uninstall(drm);
/* Disable the binner's overflow memory address, so the next
* driver probe (if any) doesn't try to reuse our old
* allocation.
*/
V3D_WRITE(V3D_BPOA, 0);
V3D_WRITE(V3D_BPOS, 0);
vc4->v3d = NULL;
}
static const struct dev_pm_ops vc4_v3d_pm_ops = {
SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
};
static const struct component_ops vc4_v3d_ops = {
.bind = vc4_v3d_bind,
.unbind = vc4_v3d_unbind,
};
static int vc4_v3d_dev_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &vc4_v3d_ops);
}
static int vc4_v3d_dev_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &vc4_v3d_ops);
return 0;
}
static const struct of_device_id vc4_v3d_dt_match[] = {
{ .compatible = "brcm,bcm2835-v3d" },
{ .compatible = "brcm,vc4-v3d" },
{}
};
struct platform_driver vc4_v3d_driver = {
.probe = vc4_v3d_dev_probe,
.remove = vc4_v3d_dev_remove,
.driver = {
.name = "vc4_v3d",
.of_match_table = vc4_v3d_dt_match,
.pm = &vc4_v3d_pm_ops,
},
};
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