[PATCH v2 3/3] drm/tegra: Add NVDEC driver
Thierry Reding
thierry.reding at gmail.com
Tue Aug 10 16:02:52 UTC 2021
On Fri, Aug 06, 2021 at 03:34:50PM +0300, Mikko Perttunen wrote:
> Add support for booting and using NVDEC on Tegra210, Tegra186
> and Tegra194 to the Host1x and TegraDRM drivers. Booting in
> secure mode is not currently supported.
>
> Signed-off-by: Mikko Perttunen <mperttunen at nvidia.com>
> ---
> v2:
> * Use devm_platform_get_and_ioremap_resource
> * Remove reset handling, done by power domain code
> * Assume runtime PM is enabled
> ---
> drivers/gpu/drm/tegra/Makefile | 3 +-
> drivers/gpu/drm/tegra/drm.c | 4 +
> drivers/gpu/drm/tegra/drm.h | 1 +
> drivers/gpu/drm/tegra/nvdec.c | 473 +++++++++++++++++++++++++++++++++
> drivers/gpu/host1x/dev.c | 18 ++
> include/linux/host1x.h | 2 +
> 6 files changed, 500 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/tegra/nvdec.c
>
> diff --git a/drivers/gpu/drm/tegra/Makefile b/drivers/gpu/drm/tegra/Makefile
> index 5d2039f0c734..b248c631f790 100644
> --- a/drivers/gpu/drm/tegra/Makefile
> +++ b/drivers/gpu/drm/tegra/Makefile
> @@ -24,7 +24,8 @@ tegra-drm-y := \
> gr2d.o \
> gr3d.o \
> falcon.o \
> - vic.o
> + vic.o \
> + nvdec.o
>
> tegra-drm-y += trace.o
>
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index b20fd0833661..5f5afd7ba37e 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -1337,15 +1337,18 @@ static const struct of_device_id host1x_drm_subdevs[] = {
> { .compatible = "nvidia,tegra210-sor", },
> { .compatible = "nvidia,tegra210-sor1", },
> { .compatible = "nvidia,tegra210-vic", },
> + { .compatible = "nvidia,tegra210-nvdec", },
> { .compatible = "nvidia,tegra186-display", },
> { .compatible = "nvidia,tegra186-dc", },
> { .compatible = "nvidia,tegra186-sor", },
> { .compatible = "nvidia,tegra186-sor1", },
> { .compatible = "nvidia,tegra186-vic", },
> + { .compatible = "nvidia,tegra186-nvdec", },
> { .compatible = "nvidia,tegra194-display", },
> { .compatible = "nvidia,tegra194-dc", },
> { .compatible = "nvidia,tegra194-sor", },
> { .compatible = "nvidia,tegra194-vic", },
> + { .compatible = "nvidia,tegra194-nvdec", },
> { /* sentinel */ }
> };
>
> @@ -1369,6 +1372,7 @@ static struct platform_driver * const drivers[] = {
> &tegra_gr2d_driver,
> &tegra_gr3d_driver,
> &tegra_vic_driver,
> + &tegra_nvdec_driver,
> };
>
> static int __init host1x_drm_init(void)
> diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
> index 8b28327c931c..fc0a19554eac 100644
> --- a/drivers/gpu/drm/tegra/drm.h
> +++ b/drivers/gpu/drm/tegra/drm.h
> @@ -202,5 +202,6 @@ extern struct platform_driver tegra_sor_driver;
> extern struct platform_driver tegra_gr2d_driver;
> extern struct platform_driver tegra_gr3d_driver;
> extern struct platform_driver tegra_vic_driver;
> +extern struct platform_driver tegra_nvdec_driver;
>
> #endif /* HOST1X_DRM_H */
> diff --git a/drivers/gpu/drm/tegra/nvdec.c b/drivers/gpu/drm/tegra/nvdec.c
> new file mode 100644
> index 000000000000..4a58b5357473
> --- /dev/null
> +++ b/drivers/gpu/drm/tegra/nvdec.c
> @@ -0,0 +1,473 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2015-2021, NVIDIA Corporation.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/host1x.h>
> +#include <linux/iommu.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> +
> +#include <soc/tegra/pmc.h>
> +
> +#include "drm.h"
> +#include "falcon.h"
> +#include "vic.h"
> +
> +struct nvdec_config {
> + const char *firmware;
> + unsigned int version;
> + bool supports_sid;
> + int num_instances;
This can be unsigned int.
> +};
> +
> +struct nvdec {
> + struct falcon falcon;
> +
> + void __iomem *regs;
> + struct tegra_drm_client client;
Traditionally this goes first to make the to_nvdec() cast helper a
no-op. But I see that we also got this wrong for VIC, and that's
probably where you copied this from. So nevermind, we can fix that
in a later patch.
> + struct host1x_channel *channel;
> + struct device *dev;
> + struct clk *clk;
> +
> + /* Platform configuration */
> + const struct nvdec_config *config;
> +};
> +
> +static inline struct nvdec *to_nvdec(struct tegra_drm_client *client)
> +{
> + return container_of(client, struct nvdec, client);
> +}
> +
> +static void nvdec_writel(struct nvdec *nvdec, u32 value, unsigned int offset)
> +{
> + writel(value, nvdec->regs + offset);
> +}
> +
> +static int nvdec_boot(struct nvdec *nvdec)
> +{
> +#ifdef CONFIG_IOMMU_API
> + struct iommu_fwspec *spec = dev_iommu_fwspec_get(nvdec->dev);
> +#endif
> + int err = 0;
Why does this need to be initialized?
> +
> +#ifdef CONFIG_IOMMU_API
> + if (nvdec->config->supports_sid && spec) {
> + u32 value;
> +
> + value = TRANSCFG_ATT(1, TRANSCFG_SID_FALCON) |
> + TRANSCFG_ATT(0, TRANSCFG_SID_HW);
This fits on a single line. The limit of characters per line was
recently bumped to 100.
> + nvdec_writel(nvdec, value, VIC_TFBIF_TRANSCFG);
> +
> + if (spec->num_ids > 0) {
> + value = spec->ids[0] & 0xffff;
> +
> + nvdec_writel(nvdec, value, VIC_THI_STREAMID0);
> + nvdec_writel(nvdec, value, VIC_THI_STREAMID1);
> + }
> + }
> +#endif
> +
> + err = falcon_boot(&nvdec->falcon);
> + if (err < 0)
> + return err;
> +
> + err = falcon_wait_idle(&nvdec->falcon);
> + if (err < 0) {
> + dev_err(nvdec->dev,
> + "failed to set application ID and FCE base\n");
Same here.
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int nvdec_init(struct host1x_client *client)
> +{
> + struct tegra_drm_client *drm = host1x_to_drm_client(client);
> + struct drm_device *dev = dev_get_drvdata(client->host);
> + struct tegra_drm *tegra = dev->dev_private;
> + struct nvdec *nvdec = to_nvdec(drm);
> + int err;
> +
> + err = host1x_client_iommu_attach(client);
> + if (err < 0 && err != -ENODEV) {
> + dev_err(nvdec->dev, "failed to attach to domain: %d\n", err);
> + return err;
> + }
> +
> + nvdec->channel = host1x_channel_request(client);
> + if (!nvdec->channel) {
> + err = -ENOMEM;
> + goto detach;
> + }
> +
> + client->syncpts[0] = host1x_syncpt_request(client, 0);
> + if (!client->syncpts[0]) {
> + err = -ENOMEM;
> + goto free_channel;
> + }
> +
> + err = tegra_drm_register_client(tegra, drm);
> + if (err < 0)
> + goto free_syncpt;
> +
> + /*
> + * Inherit the DMA parameters (such as maximum segment size) from the
> + * parent host1x device.
> + */
> + client->dev->dma_parms = client->host->dma_parms;
> +
> + return 0;
> +
> +free_syncpt:
> + host1x_syncpt_put(client->syncpts[0]);
> +free_channel:
> + host1x_channel_put(nvdec->channel);
> +detach:
> + host1x_client_iommu_detach(client);
> +
> + return err;
> +}
> +
> +static int nvdec_exit(struct host1x_client *client)
> +{
> + struct tegra_drm_client *drm = host1x_to_drm_client(client);
> + struct drm_device *dev = dev_get_drvdata(client->host);
> + struct tegra_drm *tegra = dev->dev_private;
> + struct nvdec *nvdec = to_nvdec(drm);
> + int err;
> +
> + /* avoid a dangling pointer just in case this disappears */
> + client->dev->dma_parms = NULL;
> +
> + err = tegra_drm_unregister_client(tegra, drm);
> + if (err < 0)
> + return err;
> +
> + host1x_syncpt_put(client->syncpts[0]);
> + host1x_channel_put(nvdec->channel);
> + host1x_client_iommu_detach(client);
> +
> + if (client->group) {
> + dma_unmap_single(nvdec->dev, nvdec->falcon.firmware.phys,
> + nvdec->falcon.firmware.size, DMA_TO_DEVICE);
> + tegra_drm_free(tegra, nvdec->falcon.firmware.size,
> + nvdec->falcon.firmware.virt,
> + nvdec->falcon.firmware.iova);
> + } else {
> + dma_free_coherent(nvdec->dev, nvdec->falcon.firmware.size,
> + nvdec->falcon.firmware.virt,
> + nvdec->falcon.firmware.iova);
> + }
> +
> + return 0;
> +}
> +
> +static const struct host1x_client_ops nvdec_client_ops = {
> + .init = nvdec_init,
> + .exit = nvdec_exit,
> +};
> +
> +static int nvdec_load_firmware(struct nvdec *nvdec)
> +{
> + struct host1x_client *client = &nvdec->client.base;
> + struct tegra_drm *tegra = nvdec->client.drm;
> + dma_addr_t iova;
> + size_t size;
> + void *virt;
> + int err;
> +
> + if (nvdec->falcon.firmware.virt)
> + return 0;
> +
> + err = falcon_read_firmware(&nvdec->falcon, nvdec->config->firmware);
> + if (err < 0)
> + return err;
> +
> + size = nvdec->falcon.firmware.size;
> +
> + if (!client->group) {
> + virt = dma_alloc_coherent(nvdec->dev, size, &iova, GFP_KERNEL);
> +
> + err = dma_mapping_error(nvdec->dev, iova);
> + if (err < 0)
> + return err;
> + } else {
> + virt = tegra_drm_alloc(tegra, size, &iova);
> + }
> +
> + nvdec->falcon.firmware.virt = virt;
> + nvdec->falcon.firmware.iova = iova;
> +
> + err = falcon_load_firmware(&nvdec->falcon);
> + if (err < 0)
> + goto cleanup;
> +
> + /*
> + * In this case we have received an IOVA from the shared domain, so we
> + * need to make sure to get the physical address so that the DMA API
> + * knows what memory pages to flush the cache for.
> + */
> + if (client->group) {
> + dma_addr_t phys;
> +
> + phys = dma_map_single(nvdec->dev, virt, size, DMA_TO_DEVICE);
> +
> + err = dma_mapping_error(nvdec->dev, phys);
> + if (err < 0)
> + goto cleanup;
> +
> + nvdec->falcon.firmware.phys = phys;
> + }
> +
> + return 0;
> +
> +cleanup:
> + if (!client->group)
> + dma_free_coherent(nvdec->dev, size, virt, iova);
> + else
> + tegra_drm_free(tegra, size, virt, iova);
> +
> + return err;
> +}
> +
> +
> +static int nvdec_runtime_resume(struct device *dev)
> +{
> + struct nvdec *nvdec = dev_get_drvdata(dev);
> + int err;
> +
> + err = clk_prepare_enable(nvdec->clk);
> + if (err < 0)
> + return err;
> +
> + usleep_range(10, 20);
> +
> + err = nvdec_load_firmware(nvdec);
> + if (err < 0)
> + goto disable;
> +
> + err = nvdec_boot(nvdec);
> + if (err < 0)
> + goto disable;
> +
> + return 0;
> +
> +disable:
> + clk_disable_unprepare(nvdec->clk);
> + return err;
> +}
> +
> +static int nvdec_runtime_suspend(struct device *dev)
> +{
> + struct nvdec *nvdec = dev_get_drvdata(dev);
> +
> + clk_disable_unprepare(nvdec->clk);
> +
> + return 0;
> +}
> +
> +static int nvdec_open_channel(struct tegra_drm_client *client,
> + struct tegra_drm_context *context)
> +{
> + struct nvdec *nvdec = to_nvdec(client);
> + int err;
> +
> + err = pm_runtime_get_sync(nvdec->dev);
> + if (err < 0) {
> + pm_runtime_put(nvdec->dev);
> + return err;
> + }
> +
> + context->channel = host1x_channel_get(nvdec->channel);
> + if (!context->channel) {
> + pm_runtime_put(nvdec->dev);
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static void nvdec_close_channel(struct tegra_drm_context *context)
> +{
> + struct nvdec *nvdec = to_nvdec(context->client);
> +
> + host1x_channel_put(context->channel);
> + pm_runtime_put(nvdec->dev);
> +}
> +
> +static const struct tegra_drm_client_ops nvdec_ops = {
> + .open_channel = nvdec_open_channel,
> + .close_channel = nvdec_close_channel,
> + .submit = tegra_drm_submit,
> +};
> +
> +#define NVIDIA_TEGRA_210_NVDEC_FIRMWARE "nvidia/tegra210/nvdec.bin"
> +
> +static const struct nvdec_config nvdec_t210_config = {
> + .firmware = NVIDIA_TEGRA_210_NVDEC_FIRMWARE,
> + .version = 0x21,
> + .supports_sid = false,
> +};
> +
> +#define NVIDIA_TEGRA_186_NVDEC_FIRMWARE "nvidia/tegra186/nvdec.bin"
> +
> +static const struct nvdec_config nvdec_t186_config = {
> + .firmware = NVIDIA_TEGRA_186_NVDEC_FIRMWARE,
> + .version = 0x18,
> + .supports_sid = true,
> +};
Shouldn't the above both have .num_instances = 1?
> +
> +#define NVIDIA_TEGRA_194_NVDEC_FIRMWARE "nvidia/tegra194/nvdec.bin"
> +
> +static const struct nvdec_config nvdec_t194_config = {
> + .firmware = NVIDIA_TEGRA_194_NVDEC_FIRMWARE,
> + .version = 0x19,
> + .supports_sid = true,
And shouldn't this have .num_instances = 2?
> +};
> +
> +static const struct of_device_id tegra_nvdec_of_match[] = {
> + { .compatible = "nvidia,tegra210-nvdec", .data = &nvdec_t210_config },
> + { .compatible = "nvidia,tegra186-nvdec", .data = &nvdec_t186_config },
> + { .compatible = "nvidia,tegra194-nvdec", .data = &nvdec_t194_config },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, tegra_nvdec_of_match);
> +
> +static int nvdec_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct host1x_syncpt **syncpts;
> + struct nvdec *nvdec;
> + u32 instance;
> + int err;
> +
> + /* inherit DMA mask from host1x parent */
> + err = dma_coerce_mask_and_coherent(dev, *dev->parent->dma_mask);
> + if (err < 0) {
> + dev_err(&pdev->dev, "failed to set DMA mask: %d\n", err);
> + return err;
> + }
> +
> + nvdec = devm_kzalloc(dev, sizeof(*nvdec), GFP_KERNEL);
> + if (!nvdec)
> + return -ENOMEM;
> +
> + nvdec->config = of_device_get_match_data(dev);
> +
> + syncpts = devm_kzalloc(dev, sizeof(*syncpts), GFP_KERNEL);
> + if (!syncpts)
> + return -ENOMEM;
> +
> + nvdec->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
> + if (IS_ERR(nvdec->regs))
> + return PTR_ERR(nvdec->regs);
> +
> + nvdec->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(nvdec->clk)) {
> + dev_err(&pdev->dev, "failed to get clock\n");
> + return PTR_ERR(nvdec->clk);
> + }
> +
> + err = of_property_read_u32(dev->of_node, "nvidia,instance", &instance);
> + if (err < 0)
> + instance = 0;
> +
> + if (instance > nvdec->config->num_instances)
> + return -EINVAL;
I assume nvidia,instance is zero-based? Shouldn't this then be:
if (instance >= nvdec->config->num_instances)
instead? With the current code, a second instance (nvidia,instance =
<1>) would be accepted, even if the SoC only supported a single
instance.
Thierry
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