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Message-ID: <74969e00-cedb-cbfc-1455-b85ee53524b2@suse.de>
Date: Wed, 6 Sep 2023 15:56:57 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Keith Zhao <keith.zhao@...rfivetech.com>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Sumit Semwal <sumit.semwal@...aro.org>,
Emil Renner Berthing <kernel@...il.dk>,
Shengyang Chen <shengyang.chen@...rfivetech.com>,
Conor Dooley <conor+dt@...nel.org>,
Albert Ou <aou@...s.berkeley.edu>,
Maxime Ripard <mripard@...nel.org>,
Jagan Teki <jagan@...eble.ai>,
Rob Herring <robh+dt@...nel.org>,
Chris Morgan <macromorgan@...mail.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Bjorn Andersson <andersson@...nel.org>,
Changhuang Liang <changhuang.liang@...rfivetech.com>,
Jack Zhu <jack.zhu@...rfivetech.com>,
Palmer Dabbelt <palmer@...belt.com>,
Shawn Guo <shawnguo@...nel.org>, christian.koenig@....com
Subject: Re: [PATCH v1 v1 5/7] drm/vs: Register DRM device
Hi
Am 01.08.23 um 12:10 schrieb Keith Zhao:
> Implement drm device registration interface
>
> Signed-off-by: Keith Zhao <keith.zhao@...rfivetech.com>
> ---
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/verisilicon/Kconfig | 25 ++
> drivers/gpu/drm/verisilicon/Makefile | 13 +
> drivers/gpu/drm/verisilicon/vs_drv.c | 273 +++++++++++++++++++++
> drivers/gpu/drm/verisilicon/vs_drv.h | 54 ++++
> drivers/gpu/drm/verisilicon/vs_gem.c | 298 +++++++++++++++++++++++
> drivers/gpu/drm/verisilicon/vs_gem.h | 50 ++++
> drivers/gpu/drm/verisilicon/vs_modeset.c | 92 +++++++
> drivers/gpu/drm/verisilicon/vs_modeset.h | 13 +
> include/uapi/drm/vs_drm.h | 50 ++++
> 11 files changed, 871 insertions(+)
> create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
> create mode 100644 drivers/gpu/drm/verisilicon/Makefile
> create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.c
> create mode 100644 drivers/gpu/drm/verisilicon/vs_drv.h
> create mode 100644 drivers/gpu/drm/verisilicon/vs_gem.c
> create mode 100644 drivers/gpu/drm/verisilicon/vs_gem.h
> create mode 100644 drivers/gpu/drm/verisilicon/vs_modeset.c
> create mode 100644 drivers/gpu/drm/verisilicon/vs_modeset.h
> create mode 100644 include/uapi/drm/vs_drm.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index afb3b2f5f..9ede80ef9 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -363,6 +363,8 @@ source "drivers/gpu/drm/solomon/Kconfig"
>
> source "drivers/gpu/drm/sprd/Kconfig"
>
> +source "drivers/gpu/drm/verisilicon/Kconfig"
> +
> config DRM_HYPERV
> tristate "DRM Support for Hyper-V synthetic video device"
> depends on DRM && PCI && MMU && HYPERV
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 7a09a89b4..6db3bc397 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -194,3 +194,4 @@ obj-y += gud/
> obj-$(CONFIG_DRM_HYPERV) += hyperv/
> obj-y += solomon/
> obj-$(CONFIG_DRM_SPRD) += sprd/
> +obj-$(CONFIG_DRM_VERISILICON) += verisilicon/
> diff --git a/drivers/gpu/drm/verisilicon/Kconfig b/drivers/gpu/drm/verisilicon/Kconfig
> new file mode 100644
> index 000000000..fcc39dded
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/Kconfig
> @@ -0,0 +1,25 @@
> +# SPDX-License-Identifier: GPL-2.0
> +config DRM_VERISILICON
> + tristate "DRM Support for VeriSilicon"
> + depends on DRM
> + select DRM_KMS_HELPER
> + select DRM_GEM_DMA_HELPER
> + select CMA
> + select DMA_CMA
> + help
> + Choose this option if you have a VeriSilicon soc chipset.
> + This driver provides VeriSilicon kernel mode
> + setting and buffer management. It does not
> + provide 2D or 3D acceleration.
> +
> +if DRM_VERISILICON
Maybe drop this if and make STARFIVE_HDMI depend on DRM_VERISILICON
> +
> +config STARFIVE_HDMI
That name is a bit generic. Better do some prefixing, like
DRM_VERISILICON_STARFIVE_HDMI
> + bool "Starfive specific extensions HDMI"
Maybe say "Starfive HDMI extensions"
> + help
> + This selects support for StarFive SoC specific extensions
> + for the Innosilicon HDMI driver. If you want to enable
> + HDMI on JH7110 based SoC, you should select this option.
> +
> + To compile this driver as a module, choose M here.
> +endif
> diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
> new file mode 100644
> index 000000000..26cc7e21b
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/Makefile
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +vs_drm-objs := vs_dc_hw.o \
> + vs_dc.o \
> + vs_crtc.o \
> + vs_drv.o \
> + vs_modeset.o \
> + vs_gem.o \
> + vs_plane.o
> +
> +vs_drm-$(CONFIG_STARFIVE_HDMI) += starfive_hdmi.o
> +obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o
> +
> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
> new file mode 100644
> index 000000000..69591e640
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
> @@ -0,0 +1,273 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/iommu.h>
> +#include <linux/of_graph.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> +#include <linux/version.h>
> +
> +#include <drm/drm_aperture.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_debugfs.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fbdev_generic.h>
> +#include <drm/drm_file.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_ioctl.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_prime.h>
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_vblank.h>
> +
> +#include "vs_drv.h"
> +#include "vs_modeset.h"
> +#include "vs_gem.h"
> +
> +#define DRV_NAME "starfive"
> +#define DRV_DESC "Starfive DRM driver"
Better use Verisilicon consistently throughout your driver. Use Starfive
only for Starfive-specific code (like this HDMI extention).
> +#define DRV_DATE "202305161"
> +#define DRV_MAJOR 1
> +#define DRV_MINOR 0
> +
> +static struct platform_driver vs_drm_platform_driver;
Apparently not needed. Please remove.
> +
> +static const struct file_operations fops = {
> + .owner = THIS_MODULE,
> + .open = drm_open,
> + .release = drm_release,
> + .unlocked_ioctl = drm_ioctl,
> + .compat_ioctl = drm_compat_ioctl,
> + .poll = drm_poll,
> + .read = drm_read,
> + .mmap = drm_gem_mmap,
> +};
Please use DEFINE_DRM_GEM_FOPS() to create this instance.
https://elixir.bootlin.com/linux/v6.5/source/include/drm/drm_gem.h#L438
> +
> +static struct drm_driver vs_drm_driver = {
> + .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
> + .lastclose = drm_fb_helper_lastclose,
This function pointer is to be removed soon. Please don't set it.
> + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
These call are the defaults. Please remove the assignments and let the
PRIME code handle it by itself. The function pointer are only here for
vmwgfx.
> + .gem_prime_import_sg_table = vs_gem_prime_import_sg_table,
> + .gem_prime_mmap = drm_gem_prime_mmap,
> + .dumb_create = vs_gem_dumb_create,
> + .fops = &fops,
Better call it vs_drm_fops
> + .name = DRV_NAME,
> + .desc = DRV_DESC,
> + .date = DRV_DATE,
> + .major = DRV_MAJOR,
> + .minor = DRV_MINOR,
> +};
> +
> +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> + unsigned int alignment)
> +{
> + struct vs_drm_private *priv = to_vs_dev(drm_dev);
> +
> + if (alignment > priv->pitch_alignment)
> + priv->pitch_alignment = alignment;
> +}
Please remove. There's apparantly no caller for this helper.
> +
> +static int vs_drm_bind(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct vs_drm_private *priv;
> + int ret;
> + static u64 dma_mask = DMA_BIT_MASK(40);
> + struct drm_device *drm_dev;
> +
> + /* Remove existing drivers that may own the framebuffer memory. */
> + ret = drm_aperture_remove_framebuffers(&vs_drm_driver);
> + if (ret) {
> + dev_err(dev,
> + "Failed to remove existing framebuffers - %d.\n",
> + ret);
> + return ret;
> + }
> +
> + priv = devm_drm_dev_alloc(dev, &vs_drm_driver, struct vs_drm_private, base);
> + if (IS_ERR(priv))
> + return PTR_ERR(priv);
Is it my email program or is the alignment off?
> +
> + priv->pitch_alignment = 64;
> + priv->dma_dev = priv->base.dev;
> + priv->dma_dev->coherent_dma_mask = dma_mask;
> + drm_dev = &priv->base;
> + platform_set_drvdata(pdev, drm_dev);
> +
> + vs_mode_config_init(drm_dev);
> +
> + /* Now try and bind all our sub-components */
> + ret = component_bind_all(dev, drm_dev);
> + if (ret)
> + goto err_mode;
> +
> + ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
> + if (ret)
> + goto err_bind;
> +
> + drm_mode_config_reset(drm_dev);
> +
> + drm_kms_helper_poll_init(drm_dev);
> +
> + ret = drm_dev_register(drm_dev, 0);
> + if (ret)
> + goto err_helper;
> +
> + drm_fbdev_generic_setup(drm_dev, 32);
> +
> + return 0;
> +
> +err_helper:
> + drm_kms_helper_poll_fini(drm_dev);
> +err_bind:
> + component_unbind_all(drm_dev->dev, drm_dev);
> +err_mode:
> + drm_mode_config_cleanup(drm_dev);
> +
> + return ret;
> +}
> +
> +static void vs_drm_unbind(struct device *dev)
> +{
> + struct drm_device *drm_dev = dev_get_drvdata(dev);
> +
> + drm_dev_unregister(drm_dev);
> +
> + drm_kms_helper_poll_fini(drm_dev);
> +
> + component_unbind_all(drm_dev->dev, drm_dev);
> +}
> +
> +static const struct component_master_ops vs_drm_ops = {
> + .bind = vs_drm_bind,
> + .unbind = vs_drm_unbind,
> +};
> +
> +static struct platform_driver *drm_sub_drivers[] = {
> +
> +
> + /* connector + encoder*/
> +#ifdef CONFIG_STARFIVE_HDMI
> + &starfive_hdmi_driver,
> +#endif
> +
> +};
> +
> +#define NUM_DRM_DRIVERS \
> + (sizeof(drm_sub_drivers) / sizeof(struct platform_driver *))
Replace this define with ARRAY_SIZE() everywhere.
> +
> +static int compare_dev(struct device *dev, void *data)
> +{
> + return dev == (struct device *)data;
> +}
> +
> +static struct component_match *vs_drm_match_add(struct device *dev)
> +{
> + struct component_match *match = NULL;
> + int i;
> +
> + for (i = 0; i < NUM_DRM_DRIVERS; ++i) {
> + struct platform_driver *drv = drm_sub_drivers[i];
> + struct device *p = NULL, *d;
> +
> + while ((d = platform_find_device_by_driver(p, &drv->driver))) {
> + put_device(p);
> +
> + component_match_add(dev, &match, compare_dev, d);
> + p = d;
> + }
> + put_device(p);
> + }
> +
> + return match ?: ERR_PTR(-ENODEV);
Is there someting between '?' and ':' ?
> +}
> +
> +static int vs_drm_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct component_match *match;
> +
> + match = vs_drm_match_add(dev);
> + if (IS_ERR(match))
> + return PTR_ERR(match);
> +
> + return component_master_add_with_match(dev, &vs_drm_ops, match);
> +}
> +
> +static int vs_drm_platform_remove(struct platform_device *pdev)
> +{
> + component_master_del(&pdev->dev, &vs_drm_ops);
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int vs_drm_suspend(struct device *dev)
> +{
> + return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
> +}
> +
> +static int vs_drm_resume(struct device *dev)
> +{
> + drm_mode_config_helper_resume(dev_get_drvdata(dev));
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(vs_drm_pm_ops, vs_drm_suspend, vs_drm_resume);
> +
> +static const struct of_device_id vs_drm_dt_ids[] = {
> + { .compatible = "starfive,display-subsystem", },
> + { },
> +};
> +
> +MODULE_DEVICE_TABLE(of, vs_drm_dt_ids);
> +
> +static struct platform_driver vs_drm_platform_driver = {
> + .probe = vs_drm_platform_probe,
> + .remove = vs_drm_platform_remove,
> +
> + .driver = {
> + .name = DRV_NAME,
> + .of_match_table = vs_drm_dt_ids,
> + .pm = &vs_drm_pm_ops,
> + },
> +};
> +
> +static int __init vs_drm_init(void)
> +{
> + int ret;
> +
> + ret = platform_register_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> + if (ret)
> + return ret;
> +
> + ret = platform_driver_register(&vs_drm_platform_driver);
Please use drm_platform_driver_register() here.
https://elixir.bootlin.com/linux/v6.5/source/include/drm/drm_module.h#L101
Best regards
Thomas
> + if (ret)
> + platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> +
> + return ret;
> +}
> +
> +static void __exit vs_drm_fini(void)
> +{
> + platform_driver_unregister(&vs_drm_platform_driver);
> + platform_unregister_drivers(drm_sub_drivers, NUM_DRM_DRIVERS);
> +}
> +
> +module_init(vs_drm_init);
> +module_exit(vs_drm_fini);
> +
> +MODULE_DESCRIPTION("VeriSilicon DRM Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
> new file mode 100644
> index 000000000..6ddc99dcf
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
> @@ -0,0 +1,54 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#ifndef __VS_DRV_H__
> +#define __VS_DRV_H__
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/version.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_managed.h>
> +
> +/*
> + *
> + * @dma_dev: device for DMA API.
> + * - use the first attached device if support iommu
> + else use drm device (only contiguous buffer support)
> + * @domain: iommu domain for DRM.
> + * - all DC IOMMU share same domain to reduce mapping
> + * @pitch_alignment: buffer pitch alignment required by sub-devices.
> + *
> + */
> +struct vs_drm_private {
It's better called struct vs_drm_device, because it 'inherits' fom
drm_device.
> + struct drm_device base;
> + struct device *dma_dev;
> + struct iommu_domain *domain;
> + unsigned int pitch_alignment;
> +};
> +
> +static inline struct vs_drm_private *
> +to_vs_dev(const struct drm_device *dev)
to_vs_drm_private() (or to_vs_drm_device() if you rename the struct)
> +{
> + return container_of(dev, struct vs_drm_private, base);
> +}
> +
> +void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,
> + unsigned int alignment);
Please remove.
> +
> +
> +static inline bool is_iommu_enabled(struct drm_device *dev)
> +{
> + struct vs_drm_private *priv = to_vs_dev(dev);
> +
> + return priv->domain ? true : false;
> +}
> +
> +#ifdef CONFIG_STARFIVE_HDMI
> +extern struct platform_driver starfive_hdmi_driver;
> +#endif
> +
> +#endif /* __VS_DRV_H__ */
> diff --git a/drivers/gpu/drm/verisilicon/vs_gem.c b/drivers/gpu/drm/verisilicon/vs_gem.c
> new file mode 100644
> index 000000000..a7d5a5c7b
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_gem.c
> @@ -0,0 +1,298 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#include <linux/dma-buf.h>
> +#include <linux/of_reserved_mem.h>
> +#include <drm/drm_gem_dma_helper.h>
> +
> +#include "vs_drv.h"
> +#include "vs_gem.h"
> +
> +MODULE_IMPORT_NS(DMA_BUF);
> +
> +static const struct drm_gem_object_funcs vs_gem_default_funcs;
> +
> +static int vs_gem_alloc_buf(struct vs_gem_object *vs_obj)
> +{
> + struct drm_device *dev = vs_obj->base.base.dev;
> + unsigned int nr_pages;
> + struct sg_table sgt;
> + int ret = -ENOMEM;
> +
> + if (vs_obj->base.dma_addr) {
> + drm_dbg_kms(dev, "already allocated.\n");
Not drm_dbg_kms(). In your driver, please use drm_dbg().
> + return 0;
> + }
> +
> + vs_obj->base.dma_addr = DMA_ATTR_WRITE_COMBINE | DMA_ATTR_FORCE_CONTIGUOUS
> + | DMA_ATTR_NO_KERNEL_MAPPING;
> +
> + nr_pages = vs_obj->base.base.size >> PAGE_SHIFT;
> +
> + vs_obj->pages = kvmalloc_array(nr_pages, sizeof(struct page *),
> + GFP_KERNEL | __GFP_ZERO);
> + if (!vs_obj->pages)
> + return -ENOMEM;
> +
> + vs_obj->cookie = dma_alloc_attrs(dev->dev, vs_obj->base.base.size,
> + &vs_obj->base.dma_addr, GFP_KERNEL,
> + vs_obj->dma_attrs);
> +
> + if (!vs_obj->cookie) {
> + dev_err(dev->dev, "failed to allocate buffer.\n");
Please replace all calls to dev_err() by drm_err() in all of your
patches. Same for dev_info(), dev_warn(), etc. The only exception is in
code that does not have a DRM dvice, such as the device-probing code.
> + goto err_free;
> + }
> +
> + vs_obj->iova = vs_obj->base.dma_addr;
> +
> + ret = dma_get_sgtable_attrs(dev->dev, &sgt,
> + vs_obj->cookie, vs_obj->base.dma_addr,
> + vs_obj->base.base.size, vs_obj->dma_attrs);
> + if (ret < 0) {
> + dev_err(dev->dev, "failed to get sgtable.\n");
> + goto err_mem_free;
> + }
> +
> + if (drm_prime_sg_to_page_array(&sgt, vs_obj->pages, nr_pages)) {
> + dev_err(dev->dev, "invalid sgtable.\n");
> + ret = -EINVAL;
> + goto err_sgt_free;
> + }
> +
> + sg_free_table(&sgt);
> +
> + return 0;
> +
> +err_sgt_free:
> + sg_free_table(&sgt);
> +err_mem_free:
> + dma_free_attrs(dev->dev, vs_obj->base.base.size, vs_obj->cookie,
> + vs_obj->base.dma_addr, vs_obj->dma_attrs);
Indention
> +err_free:
> + kvfree(vs_obj->pages);
> +
> + return ret;
> +}
> +
> +static void vs_gem_free_buf(struct vs_gem_object *vs_obj)
> +{
> + struct drm_device *dev = vs_obj->base.base.dev;
> +
> + if (!vs_obj->base.dma_addr) {
> + drm_dbg_kms(dev, "dma_addr is invalid.\n");
> + return;
> + }
> +
> + dma_free_attrs(dev->dev, vs_obj->base.base.size, vs_obj->cookie,
> + (dma_addr_t)vs_obj->base.dma_addr,
> + vs_obj->dma_attrs);
> +
> + kvfree(vs_obj->pages);
> +}
> +
> +static void vs_gem_free_object(struct drm_gem_object *obj)
> +{
> + struct vs_gem_object *vs_obj = to_vs_gem_object(obj);
> +
> + if (obj->import_attach)
> + drm_prime_gem_destroy(obj, vs_obj->base.sgt);
> + else
> + vs_gem_free_buf(vs_obj);
> +
> + drm_gem_object_release(obj);
> +
> + kfree(vs_obj);
> +}
> +
> +static struct vs_gem_object *vs_gem_alloc_object(struct drm_device *dev,
> + size_t size)
> +{
> + struct vs_gem_object *vs_obj;
> + struct drm_gem_object *obj;
> + int ret;
> +
> + vs_obj = kzalloc(sizeof(*vs_obj), GFP_KERNEL);
> + if (!vs_obj)
> + return ERR_PTR(-ENOMEM);
> +
> + vs_obj->base.base.size = size;
> + obj = &vs_obj->base.base;
> +
> + ret = drm_gem_object_init(dev, obj, size);
> + if (ret)
> + goto err_free;
> +
> + vs_obj->base.base.funcs = &vs_gem_default_funcs;
> +
> + ret = drm_gem_create_mmap_offset(obj);
> + if (ret) {
> + drm_gem_object_release(obj);
> + goto err_free;
> + }
> +
> + return vs_obj;
> +
> +err_free:
> + kfree(vs_obj);
> + return ERR_PTR(ret);
> +}
> +
> +static struct vs_gem_object *vs_gem_create_object(struct drm_device *dev,
> + size_t size)
> +{
> + struct vs_gem_object *vs_obj;
> + int ret;
> +
> + size = PAGE_ALIGN(size);
> +
> + vs_obj = vs_gem_alloc_object(dev, size);
> + if (IS_ERR(vs_obj))
> + return vs_obj;
> +
> + ret = vs_gem_alloc_buf(vs_obj);
> + if (ret) {
> + drm_gem_object_release(&vs_obj->base.base);
> + kfree(vs_obj);
> + return ERR_PTR(ret);
> + }
> +
> + return vs_obj;
> +}
> +
> +static struct vs_gem_object *vs_gem_create_with_handle(struct drm_device *dev,
> + struct drm_file *file,
> + size_t size,
> + unsigned int *handle)
> +{
> + struct vs_gem_object *vs_obj;
> + struct drm_gem_object *obj;
> + int ret;
> +
> + vs_obj = vs_gem_create_object(dev, size);
> + if (IS_ERR(vs_obj))
> + return vs_obj;
> +
> + obj = &vs_obj->base.base;
> +
> + ret = drm_gem_handle_create(file, obj, handle);
> +
> + drm_gem_object_put(obj);
> +
> + if (ret)
> + return ERR_PTR(ret);
> +
> + return vs_obj;
> +}
> +
> +static struct sg_table *vs_gem_prime_get_sg_table(struct drm_gem_object *obj)
> +{
> + struct vs_gem_object *vs_obj = to_vs_gem_object(obj);
> +
> + return drm_prime_pages_to_sg(obj->dev, vs_obj->pages,
> + vs_obj->base.base.size >> PAGE_SHIFT);
> +}
> +
> +static int vs_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
> +{
> + struct vs_gem_object *vs_obj = to_vs_gem_object(obj);
> +
> + vs_obj->base.vaddr = vs_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING ?
> + page_address(vs_obj->cookie) : vs_obj->cookie;
> +
> + return drm_gem_dma_vmap(&vs_obj->base, map);
> +}
> +
> +static const struct vm_operations_struct vs_vm_ops = {
> + .open = drm_gem_vm_open,
> + .close = drm_gem_vm_close,
> +};
> +
> +static const struct drm_gem_object_funcs vs_gem_default_funcs = {
> + .free = vs_gem_free_object,
> + .get_sg_table = vs_gem_prime_get_sg_table,
> + .vmap = vs_gem_prime_vmap,
> + .mmap = drm_gem_dma_object_mmap,
> + .vm_ops = &vs_vm_ops,
> +};
> +
> +int vs_gem_dumb_create(struct drm_file *file,
> + struct drm_device *dev,
> + struct drm_mode_create_dumb *args)
> +{
> + struct vs_drm_private *priv = to_vs_dev(dev);
> + struct vs_gem_object *vs_obj;
> + unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
> +
> + if (args->bpp % 10)
> + args->pitch = ALIGN(pitch, priv->pitch_alignment);
> + else
> + /* for costum 10bit format with no bit gaps */
> + args->pitch = pitch;
> + args->size = PAGE_ALIGN(args->pitch * args->height);
> + vs_obj = vs_gem_create_with_handle(dev, file, args->size,
> + &args->handle);
> + return PTR_ERR_OR_ZERO(vs_obj);
> +}
> +
> +struct drm_gem_object *
> +vs_gem_prime_import_sg_table(struct drm_device *dev,
> + struct dma_buf_attachment *attach,
> + struct sg_table *sgt)
> +{
> + struct vs_gem_object *vs_obj;
> + int npages;
> + int ret;
> + struct scatterlist *s;
> + u32 i;
> + dma_addr_t expected;
> + size_t size = attach->dmabuf->size;
> +
> + size = PAGE_ALIGN(size);
> +
> + vs_obj = vs_gem_alloc_object(dev, size);
> + if (IS_ERR(vs_obj))
> + return ERR_CAST(vs_obj);
> +
> + expected = sg_dma_address(sgt->sgl);
> + for_each_sg(sgt->sgl, s, sgt->nents, i) {
> + if (sg_dma_address(s) != expected) {
> + DRM_ERROR("sg_table is not contiguous");
> + ret = -EINVAL;
> + goto err;
> + }
> + if (sg_dma_len(s) & (PAGE_SIZE - 1)) {
> + ret = -EINVAL;
> + goto err;
> + }
> + if (i == 0)
> + vs_obj->iova = sg_dma_address(s);
> + expected = sg_dma_address(s) + sg_dma_len(s);
> + }
> +
> + vs_obj->base.dma_addr = sg_dma_address(sgt->sgl);
> +
> + npages = vs_obj->base.base.size >> PAGE_SHIFT;
> + vs_obj->pages = kvmalloc_array(npages, sizeof(struct page *),
> + GFP_KERNEL);
> + if (!vs_obj->pages) {
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + ret = drm_prime_sg_to_page_array(sgt, vs_obj->pages, npages);
> + if (ret)
> + goto err_free_page;
> +
> + vs_obj->base.sgt = sgt;
> +
> + return &vs_obj->base.base;
> +
> +err_free_page:
> + kvfree(vs_obj->pages);
> +err:
> + vs_gem_free_object(&vs_obj->base.base);
> +
> + return ERR_PTR(ret);
> +}
> diff --git a/drivers/gpu/drm/verisilicon/vs_gem.h b/drivers/gpu/drm/verisilicon/vs_gem.h
> new file mode 100644
> index 000000000..d9ff6d23b
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_gem.h
> @@ -0,0 +1,50 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#ifndef __VS_GEM_H__
> +#define __VS_GEM_H__
> +
> +#include <linux/dma-buf.h>
> +
> +#include <drm/drm_gem.h>
> +#include <drm/drm_gem_dma_helper.h>
> +#include <drm/drm_prime.h>
> +
> +#include "vs_drv.h"
> +/*
> + *
> + * @base: drm_gem_dma_object.
> + * @cookie: cookie returned by dma_alloc_attrs
> + * - not kernel virtual address with DMA_ATTR_NO_KERNEL_MAPPING
> + * @dma_attrs: attribute for DMA API
> + * @get_pages: flag for manually applying for non-contiguous memory.
> + * @pages: Array of backing pages.
> + *
> + */
> +struct vs_gem_object {
> + struct drm_gem_dma_object base;
You are replacing almost all of the GEM DMA object's helper code.
Either inherit directly from drm_gem_object drop the dependency
entirely, or you could try to fit your code into GEM DMA as well.
Best regards
Thomas
> + void *cookie;
> + u32 iova;
> + unsigned long dma_attrs;
> + bool get_pages;
> + struct page **pages;
> +};
> +
> +static inline struct vs_gem_object *
> +to_vs_gem_object(const struct drm_gem_object *bo)
> +{
> + return container_of(to_drm_gem_dma_obj(bo), struct vs_gem_object, base);
> +}
> +
> +int vs_gem_dumb_create(struct drm_file *file_priv,
> + struct drm_device *drm,
> + struct drm_mode_create_dumb *args);
> +
> +struct drm_gem_object *
> +vs_gem_prime_import_sg_table(struct drm_device *dev,
> + struct dma_buf_attachment *attach,
> + struct sg_table *sgt);
> +
> +#endif /* __VS_GEM_H__ */
> diff --git a/drivers/gpu/drm/verisilicon/vs_modeset.c b/drivers/gpu/drm/verisilicon/vs_modeset.c
> new file mode 100644
> index 000000000..cd0bdf530
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_modeset.c
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/version.h>
> +
> +#include <drm/drm_damage_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_framebuffer.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_gem_dma_helper.h>
> +
> +#include "vs_modeset.h"
> +#include "vs_gem.h"
> +
> +#define fourcc_mod_vs_get_type(val) \
> + (((val) & DRM_FORMAT_MOD_VS_TYPE_MASK) >> 54)
> +
> +struct vs_gem_object *vs_fb_get_gem_obj(struct drm_framebuffer *fb,
> + unsigned char plane)
> +{
> + if (plane > DRM_FORMAT_MAX_PLANES)
> + return NULL;
> +
> + return to_vs_gem_object(fb->obj[plane]);
Please use
drm_gem_object *gem = drm_gem_fb_get_obj(fb,plane)
if (!gem)
return NULL
return to_vs_gem_object(gem);
This will do the right thing, print the appropriate warnings and hide
the details of the implementation.
> +}
> +
> +static const struct drm_format_info vs_formats[] = {
> + {.format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .char_per_block = { 20, 40, 0 },
> + .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true},
> + {.format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .char_per_block = { 20, 20, 20 },
> + .block_w = { 4, 4, 4 }, .block_h = { 4, 4, 4 }, .hsub = 1, .vsub = 1, .is_yuv = true},
> +};
> +
> +static const struct drm_format_info *
> +vs_lookup_format_info(const struct drm_format_info formats[],
> + int num_formats, u32 format)
> +{
> + int i;
> +
> + for (i = 0; i < num_formats; i++) {
> + if (formats[i].format == format)
> + return &formats[i];
> + }
> +
> + return NULL;
> +}
> +
> +static const struct drm_format_info *
> +vs_get_format_info(const struct drm_mode_fb_cmd2 *cmd)
> +{
> + if (fourcc_mod_vs_get_type(cmd->modifier[0]) ==
> + DRM_FORMAT_MOD_VS_TYPE_CUSTOM_10BIT)
> + return vs_lookup_format_info(vs_formats, ARRAY_SIZE(vs_formats),
> + cmd->pixel_format);
> + else
> + return NULL;
> +}
> +
> +static const struct drm_mode_config_funcs vs_mode_config_funcs = {
> + .fb_create = drm_gem_fb_create,
> + .get_format_info = vs_get_format_info,
> + .output_poll_changed = drm_fb_helper_output_poll_changed,
Another deprecated callback. Don't assign to it. Probe helpers will do
the right thing.
> + .atomic_check = drm_atomic_helper_check,
> + .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static struct drm_mode_config_helper_funcs vs_mode_config_helpers = {
> + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
> +};
> +
> +void vs_mode_config_init(struct drm_device *dev)
> +{
> + drm_mode_config_init(dev);
> + dev->mode_config.fb_modifiers_not_supported = false;
> +
> + if (dev->mode_config.max_width == 0 ||
> + dev->mode_config.max_height == 0) {
> + dev->mode_config.min_width = 0;
> + dev->mode_config.min_height = 0;
> + dev->mode_config.max_width = 4096;
> + dev->mode_config.max_height = 4096;
> + }
> + dev->mode_config.funcs = &vs_mode_config_funcs;
> + dev->mode_config.helper_private = &vs_mode_config_helpers;
> +}
> diff --git a/drivers/gpu/drm/verisilicon/vs_modeset.h b/drivers/gpu/drm/verisilicon/vs_modeset.h
> new file mode 100644
> index 000000000..2e1f04a8a
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_modeset.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#ifndef __VS_FB_H__
> +#define __VS_FB_H__
> +
> +struct vs_gem_object *vs_fb_get_gem_obj(struct drm_framebuffer *fb,
> + unsigned char plane);
> +
> +void vs_mode_config_init(struct drm_device *dev);
> +#endif /* __VS_FB_H__ */
> diff --git a/include/uapi/drm/vs_drm.h b/include/uapi/drm/vs_drm.h
> new file mode 100644
> index 000000000..96b7fc95d
> --- /dev/null
> +++ b/include/uapi/drm/vs_drm.h
> @@ -0,0 +1,50 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +/*
> + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
> + */
> +
> +#ifndef __VS_DRM_H__
> +#define __VS_DRM_H__
> +
> +#include "drm.h"
> +
> +enum drm_vs_degamma_mode {
> + VS_DEGAMMA_DISABLE = 0,
> + VS_DEGAMMA_BT709 = 1,
> + VS_DEGAMMA_BT2020 = 2,
> +};
> +
> +enum drm_vs_sync_dc_mode {
> + VS_SINGLE_DC = 0,
> + VS_MULTI_DC_PRIMARY = 1,
> + VS_MULTI_DC_SECONDARY = 2,
> +};
> +
> +enum drm_vs_mmu_prefetch_mode {
> + VS_MMU_PREFETCH_DISABLE = 0,
> + VS_MMU_PREFETCH_ENABLE = 1,
> +};
> +
> +struct drm_vs_watermark {
> + __u32 watermark;
> + __u8 qos_low;
> + __u8 qos_high;
> +};
> +
> +struct drm_vs_color_mgmt {
> + __u32 colorkey;
> + __u32 colorkey_high;
> + __u32 clear_value;
> + bool clear_enable;
> + bool transparency;
> +};
> +
> +struct drm_vs_roi {
> + bool enable;
> + __u16 roi_x;
> + __u16 roi_y;
> + __u16 roi_w;
> + __u16 roi_h;
> +};
> +
> +#endif /* __VS_DRM_H__ */
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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