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linux_dsm_epyc7002/drivers/gpu/drm/panfrost/panfrost_device.c
Rob Herring 7282f7645d drm/panfrost: Implement per FD address spaces 
Up until now, a single shared GPU address space was used. This is not
ideal as there's no protection between processes and doesn't work for
supporting the same GPU/CPU VA feature. Most importantly, this will
hopefully mitigate Alyssa's fear of WebGL, whatever that is.

Most of the changes here are moving struct drm_mm and struct
panfrost_mmu objects from the per device struct to the per FD struct.
The critical function is panfrost_mmu_as_get() which handles allocating
and switching the h/w address spaces.

There's 3 states an AS can be in: free, allocated, and in use. When a
job runs, it requests an address space and then marks it not in use when
job is complete(but stays assigned). The first time thru, we find a free
AS in the alloc_mask and assign the AS to the FD. Then the next time
thru, we most likely already have our AS and we just mark it in use with
a ref count. We need a ref count because we have multiple job slots. If
the job/FD doesn't have an AS assigned and there are no free ones, then
we pick an allocated one not in use from our LRU list and switch the AS
from the old FD to the new one.

Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Steven Price <steven.price@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190813150115.30338-1-robh@kernel.org
2019-08-19 11:34:57 -05:00

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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2018 Marty E. Plummer <hanetzer@startmail.com> */
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include "panfrost_device.h"
#include "panfrost_devfreq.h"
#include "panfrost_features.h"
#include "panfrost_gpu.h"
#include "panfrost_job.h"
#include "panfrost_mmu.h"
#include "panfrost_perfcnt.h"
static int panfrost_reset_init(struct panfrost_device *pfdev)
{
int err;
pfdev->rstc = devm_reset_control_array_get(pfdev->dev, false, true);
if (IS_ERR(pfdev->rstc)) {
dev_err(pfdev->dev, "get reset failed %ld\n", PTR_ERR(pfdev->rstc));
return PTR_ERR(pfdev->rstc);
}
err = reset_control_deassert(pfdev->rstc);
if (err)
return err;
return 0;
}
static void panfrost_reset_fini(struct panfrost_device *pfdev)
{
reset_control_assert(pfdev->rstc);
}
static int panfrost_clk_init(struct panfrost_device *pfdev)
{
int err;
unsigned long rate;
pfdev->clock = devm_clk_get(pfdev->dev, NULL);
if (IS_ERR(pfdev->clock)) {
dev_err(pfdev->dev, "get clock failed %ld\n", PTR_ERR(pfdev->clock));
return PTR_ERR(pfdev->clock);
}
rate = clk_get_rate(pfdev->clock);
dev_info(pfdev->dev, "clock rate = %lu\n", rate);
err = clk_prepare_enable(pfdev->clock);
if (err)
return err;
pfdev->bus_clock = devm_clk_get_optional(pfdev->dev, "bus");
if (IS_ERR(pfdev->bus_clock)) {
dev_err(pfdev->dev, "get bus_clock failed %ld\n",
PTR_ERR(pfdev->bus_clock));
return PTR_ERR(pfdev->bus_clock);
}
if (pfdev->bus_clock) {
rate = clk_get_rate(pfdev->bus_clock);
dev_info(pfdev->dev, "bus_clock rate = %lu\n", rate);
err = clk_prepare_enable(pfdev->bus_clock);
if (err)
goto disable_clock;
}
return 0;
disable_clock:
clk_disable_unprepare(pfdev->clock);
return err;
}
static void panfrost_clk_fini(struct panfrost_device *pfdev)
{
clk_disable_unprepare(pfdev->bus_clock);
clk_disable_unprepare(pfdev->clock);
}
static int panfrost_regulator_init(struct panfrost_device *pfdev)
{
int ret;
pfdev->regulator = devm_regulator_get_optional(pfdev->dev, "mali");
if (IS_ERR(pfdev->regulator)) {
ret = PTR_ERR(pfdev->regulator);
pfdev->regulator = NULL;
if (ret == -ENODEV)
return 0;
dev_err(pfdev->dev, "failed to get regulator: %d\n", ret);
return ret;
}
ret = regulator_enable(pfdev->regulator);
if (ret < 0) {
dev_err(pfdev->dev, "failed to enable regulator: %d\n", ret);
return ret;
}
return 0;
}
static void panfrost_regulator_fini(struct panfrost_device *pfdev)
{
if (pfdev->regulator)
regulator_disable(pfdev->regulator);
}
int panfrost_device_init(struct panfrost_device *pfdev)
{
int err;
struct resource *res;
mutex_init(&pfdev->sched_lock);
mutex_init(&pfdev->reset_lock);
INIT_LIST_HEAD(&pfdev->scheduled_jobs);
INIT_LIST_HEAD(&pfdev->as_lru_list);
spin_lock_init(&pfdev->hwaccess_lock);
spin_lock_init(&pfdev->as_lock);
err = panfrost_clk_init(pfdev);
if (err) {
dev_err(pfdev->dev, "clk init failed %d\n", err);
return err;
}
err = panfrost_regulator_init(pfdev);
if (err) {
dev_err(pfdev->dev, "regulator init failed %d\n", err);
goto err_out0;
}
err = panfrost_reset_init(pfdev);
if (err) {
dev_err(pfdev->dev, "reset init failed %d\n", err);
goto err_out1;
}
res = platform_get_resource(pfdev->pdev, IORESOURCE_MEM, 0);
pfdev->iomem = devm_ioremap_resource(pfdev->dev, res);
if (IS_ERR(pfdev->iomem)) {
dev_err(pfdev->dev, "failed to ioremap iomem\n");
err = PTR_ERR(pfdev->iomem);
goto err_out2;
}
err = panfrost_gpu_init(pfdev);
if (err)
goto err_out2;
err = panfrost_mmu_init(pfdev);
if (err)
goto err_out3;
err = panfrost_job_init(pfdev);
if (err)
goto err_out4;
/* runtime PM will wake us up later */
panfrost_gpu_power_off(pfdev);
pm_runtime_set_active(pfdev->dev);
pm_runtime_get_sync(pfdev->dev);
pm_runtime_mark_last_busy(pfdev->dev);
pm_runtime_put_autosuspend(pfdev->dev);
err = panfrost_perfcnt_init(pfdev);
if (err)
goto err_out5;
return 0;
err_out5:
panfrost_job_fini(pfdev);
err_out4:
panfrost_mmu_fini(pfdev);
err_out3:
panfrost_gpu_fini(pfdev);
err_out2:
panfrost_reset_fini(pfdev);
err_out1:
panfrost_regulator_fini(pfdev);
err_out0:
panfrost_clk_fini(pfdev);
return err;
}
void panfrost_device_fini(struct panfrost_device *pfdev)
{
panfrost_perfcnt_fini(pfdev);
panfrost_job_fini(pfdev);
panfrost_mmu_fini(pfdev);
panfrost_gpu_fini(pfdev);
panfrost_reset_fini(pfdev);
panfrost_regulator_fini(pfdev);
panfrost_clk_fini(pfdev);
}
const char *panfrost_exception_name(struct panfrost_device *pfdev, u32 exception_code)
{
switch (exception_code) {
/* Non-Fault Status code */
case 0x00: return "NOT_STARTED/IDLE/OK";
case 0x01: return "DONE";
case 0x02: return "INTERRUPTED";
case 0x03: return "STOPPED";
case 0x04: return "TERMINATED";
case 0x08: return "ACTIVE";
/* Job exceptions */
case 0x40: return "JOB_CONFIG_FAULT";
case 0x41: return "JOB_POWER_FAULT";
case 0x42: return "JOB_READ_FAULT";
case 0x43: return "JOB_WRITE_FAULT";
case 0x44: return "JOB_AFFINITY_FAULT";
case 0x48: return "JOB_BUS_FAULT";
case 0x50: return "INSTR_INVALID_PC";
case 0x51: return "INSTR_INVALID_ENC";
case 0x52: return "INSTR_TYPE_MISMATCH";
case 0x53: return "INSTR_OPERAND_FAULT";
case 0x54: return "INSTR_TLS_FAULT";
case 0x55: return "INSTR_BARRIER_FAULT";
case 0x56: return "INSTR_ALIGN_FAULT";
case 0x58: return "DATA_INVALID_FAULT";
case 0x59: return "TILE_RANGE_FAULT";
case 0x5A: return "ADDR_RANGE_FAULT";
case 0x60: return "OUT_OF_MEMORY";
/* GPU exceptions */
case 0x80: return "DELAYED_BUS_FAULT";
case 0x88: return "SHAREABILITY_FAULT";
/* MMU exceptions */
case 0xC1: return "TRANSLATION_FAULT_LEVEL1";
case 0xC2: return "TRANSLATION_FAULT_LEVEL2";
case 0xC3: return "TRANSLATION_FAULT_LEVEL3";
case 0xC4: return "TRANSLATION_FAULT_LEVEL4";
case 0xC8: return "PERMISSION_FAULT";
case 0xC9 ... 0xCF: return "PERMISSION_FAULT";
case 0xD1: return "TRANSTAB_BUS_FAULT_LEVEL1";
case 0xD2: return "TRANSTAB_BUS_FAULT_LEVEL2";
case 0xD3: return "TRANSTAB_BUS_FAULT_LEVEL3";
case 0xD4: return "TRANSTAB_BUS_FAULT_LEVEL4";
case 0xD8: return "ACCESS_FLAG";
case 0xD9 ... 0xDF: return "ACCESS_FLAG";
case 0xE0 ... 0xE7: return "ADDRESS_SIZE_FAULT";
case 0xE8 ... 0xEF: return "MEMORY_ATTRIBUTES_FAULT";
}
return "UNKNOWN";
}
void panfrost_device_reset(struct panfrost_device *pfdev)
{
panfrost_gpu_soft_reset(pfdev);
panfrost_gpu_power_on(pfdev);
panfrost_mmu_reset(pfdev);
panfrost_job_enable_interrupts(pfdev);
}
#ifdef CONFIG_PM
int panfrost_device_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct panfrost_device *pfdev = platform_get_drvdata(pdev);
panfrost_device_reset(pfdev);
panfrost_devfreq_resume(pfdev);
return 0;
}
int panfrost_device_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct panfrost_device *pfdev = platform_get_drvdata(pdev);
if (!panfrost_job_is_idle(pfdev))
return -EBUSY;
panfrost_devfreq_suspend(pfdev);
panfrost_gpu_power_off(pfdev);
return 0;
}
#endif
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