[Linaro-mm-sig] Re: [v1,v1,5/7] drm/vs: Register DRM device

Hi,

On 2023/8/1 18:10, Keith Zhao wrote:

Implement drm device registration interface

Signed-off-by: Keith Zhao keith.zhao@starfivetech.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

+config STARFIVE_HDMI

• bool "Starfive specific extensions HDMI"
• 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

Why not use

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" +#define DRV_DATE "202305161"

The date is not correct here, generally it should have 8 numbers,

while you have 9 digits, why you are so special ?

+#define DRV_MAJOR 1 +#define DRV_MINOR 0

+static struct platform_driver vs_drm_platform_driver;

+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,

+};

+static struct drm_driver vs_drm_driver = {

• .driver_features = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
• .lastclose = drm_fb_helper_lastclose,
• .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
• .prime_fd_to_handle = drm_gem_prime_fd_to_handle,

You are not using drm-tip branch, in normal case, new patch for drm should be compile against the drm-tip branch.

the drm_gem_prime_handle_to_fd() and drm_gem_prime_fd_to_handle() function is not be exported anymore.

see 71a7974ac7019 ('drm/prime: Unexport helpers for fd/handle conversion')

So, you patch will be pass the compile test, I guess.

• .gem_prime_import_sg_table = vs_gem_prime_import_sg_table,

By implement gem_prime_import_sg_table, while in curiosity,

which drivers you are import the shared buffer from ?

Is this vs_gem_prime_import_sg_table() function really has been used and tested ?

As far as I could understand, most embedded SoC using KMS-RO framework.

By using the KMS-RO framework, typically the GPU driver will import buffer from the Display controller.

So, why you need implement this function interface?

• .gem_prime_mmap = drm_gem_prime_mmap,

This hook is(or going to be) obsolete,  see 0adec22702d4 ('drm: Remove struct drm_driver.gem_prime_mmap')

• .dumb_create = vs_gem_dumb_create,
• .fops = &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;
  

+}

+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);
  

• 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 *))

I think, the macro is bad name,

you have only one drm drivers, all of the rest are sub platform drivers

which need to bind to the only one drm master.

+static int compare_dev(struct device *dev, void *data) +{

• return dev == (struct device *)data;

+}

There already has a 'component_compare_dev()' defined in component.c (see include/linux/component.h)

why you need want implement one yourself.

+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);

+}

+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);
• 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 {

• 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) +{

• return container_of(dev, struct vs_drm_private, base);

+}

+void vs_drm_update_pitch_alignment(struct drm_device *drm_dev,

• 		   unsigned int alignment);
  

+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");
  

• 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");
  

• 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);
  

+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;
• 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]);

+}

+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,
• .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) {
  

Not sure if the 'if' is really needed .

• 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__ */