On Tue, Aug 01, 2023 at 06:10:28PM +0800, Keith Zhao wrote: > +#define DRV_NAME "starfive" > +#define DRV_DESC "Starfive DRM driver"
Shouldn't it be verisilicon?
> +#define DRV_DATE "202305161"
> +#define DRV_MAJOR 1
> +#define DRV_MINOR 0
> +
> +static struct platform_driver vs_drm_platform_driver;
You don't seem to need that forward declaration.
> +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,
> + .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,
> + .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;
dma_set_coherent_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);
If you're using drmm_mode_config_init this can go away.
> +
> + 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 *))
> +
> +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);
> +}
> +
> +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);
> +}
This looks *very* similar to the GEM DMA ops. Why do you need to roll
your own?
> +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);
> +}
Ditto
Maxime
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