This patch implements gem related APIs for JH7100 SoC.
Signed-off-by: Keith Zhao keith.zhao@starfivetech.com --- drivers/gpu/drm/verisilicon/Makefile | 3 +- drivers/gpu/drm/verisilicon/vs_drv.c | 6 + drivers/gpu/drm/verisilicon/vs_gem.c | 372 +++++++++++++++++++++++++++ drivers/gpu/drm/verisilicon/vs_gem.h | 72 ++++++ 4 files changed, 452 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/verisilicon/vs_gem.c create mode 100644 drivers/gpu/drm/verisilicon/vs_gem.h
diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile index 64ce1b26546c..30360e370e47 100644 --- a/drivers/gpu/drm/verisilicon/Makefile +++ b/drivers/gpu/drm/verisilicon/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0
-vs_drm-objs := vs_drv.o +vs_drm-objs := vs_drv.o \ + vs_gem.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 index 24d333598477..e0a2fc43b55f 100644 --- a/drivers/gpu/drm/verisilicon/vs_drv.c +++ b/drivers/gpu/drm/verisilicon/vs_drv.c @@ -30,6 +30,7 @@ #include <drm/drm_vblank.h>
#include "vs_drv.h" +#include "vs_gem.h"
#define DRV_NAME "starfive" #define DRV_DESC "Starfive DRM driver" @@ -47,6 +48,7 @@ static const struct file_operations fops = { .compat_ioctl = drm_compat_ioctl, .poll = drm_poll, .read = drm_read, + .mmap = vs_gem_mmap, };
static struct drm_driver vs_drm_driver = { @@ -54,6 +56,10 @@ static struct drm_driver vs_drm_driver = { .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 = vs_gem_prime_import, + .gem_prime_import_sg_table = vs_gem_prime_import_sg_table, + .gem_prime_mmap = vs_gem_prime_mmap, + .dumb_create = vs_gem_dumb_create, .fops = &fops, .name = DRV_NAME, .desc = DRV_DESC, diff --git a/drivers/gpu/drm/verisilicon/vs_gem.c b/drivers/gpu/drm/verisilicon/vs_gem.c new file mode 100644 index 000000000000..3f963471c1ab --- /dev/null +++ b/drivers/gpu/drm/verisilicon/vs_gem.c @@ -0,0 +1,372 @@ +// 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" + +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.dev; + unsigned int nr_pages; + struct sg_table sgt; + int ret = -ENOMEM; + + if (vs_obj->dma_addr) { + DRM_DEV_DEBUG_KMS(dev->dev, "already allocated.\n"); + return 0; + } + + vs_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE | DMA_ATTR_FORCE_CONTIGUOUS + | DMA_ATTR_NO_KERNEL_MAPPING; + + nr_pages = vs_obj->size >> PAGE_SHIFT; + + vs_obj->pages = kvmalloc_array(nr_pages, sizeof(struct page *), + GFP_KERNEL | __GFP_ZERO); + if (!vs_obj->pages) { + DRM_DEV_ERROR(dev->dev, "failed to allocate pages.\n"); + return -ENOMEM; + } + + vs_obj->cookie = dma_alloc_attrs(to_dma_dev(dev), vs_obj->size, + &vs_obj->dma_addr, GFP_KERNEL, + vs_obj->dma_attrs); + + if (!vs_obj->cookie) { + DRM_DEV_ERROR(dev->dev, "failed to allocate buffer.\n"); + goto err_free; + } + + vs_obj->iova = vs_obj->dma_addr; + + ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, + vs_obj->cookie, vs_obj->dma_addr, + vs_obj->size, vs_obj->dma_attrs); + if (ret < 0) { + DRM_DEV_ERROR(dev->dev, "failed to get sgtable.\n"); + goto err_mem_free; + } + + if (drm_prime_sg_to_page_array(&sgt, vs_obj->pages, nr_pages)) { + DRM_DEV_ERROR(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(to_dma_dev(dev), vs_obj->size, vs_obj->cookie, + vs_obj->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.dev; + + if (!vs_obj->dma_addr) { + DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n"); + return; + } + + dma_free_attrs(to_dma_dev(dev), vs_obj->size, vs_obj->cookie, + (dma_addr_t)vs_obj->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->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->size = size; + obj = &vs_obj->base; + + ret = drm_gem_object_init(dev, obj, size); + if (ret) + goto err_free; + + vs_obj->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); +} + +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); + 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; + + ret = drm_gem_handle_create(file, obj, handle); + + drm_gem_object_put(obj); + + if (ret) + return ERR_PTR(ret); + + return vs_obj; +} + +static int vs_gem_mmap_obj(struct drm_gem_object *obj, + struct vm_area_struct *vma) +{ + struct vs_gem_object *vs_obj = to_vs_gem_object(obj); + struct drm_device *drm_dev = vs_obj->base.dev; + unsigned long vm_size; + int ret = 0; + + vm_size = vma->vm_end - vma->vm_start; + if (vm_size > vs_obj->size) + return -EINVAL; + + vma->vm_pgoff = 0; + + /* + * We allocated a struct page table for starfive_obj, so clear + * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). + */ + vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP); + + vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); + + ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, vs_obj->cookie, + vs_obj->dma_addr, vs_obj->size, + vs_obj->dma_attrs); + + if (ret) + drm_gem_vm_close(vma); + + return ret; +} + +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->size >> PAGE_SHIFT); +} + +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); + + void *vaddr = vs_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING ? + page_address(vs_obj->cookie) : vs_obj->cookie; + + iosys_map_set_vaddr(map, vaddr); + + return 0; +} + +void vs_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map) +{ + /* Nothing to do */ +} + +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, + .vunmap = vs_gem_prime_vunmap, + .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 = dev->dev_private; + 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(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev)); +} + +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->dma_addr = sg_dma_address(sgt->sgl); + + npages = vs_obj->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->sgt = sgt; + + return &vs_obj->base; + +err_free_page: + kvfree(vs_obj->pages); +err: + vs_gem_free_object(&vs_obj->base); + + return ERR_PTR(ret); +} + +int vs_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) +{ + int ret = 0; + + ret = drm_gem_mmap_obj(obj, obj->size, vma); + if (ret < 0) + return ret; + + return vs_gem_mmap_obj(obj, vma); +} + +int vs_gem_mmap(struct file *filp, struct vm_area_struct *vma) +{ + struct drm_gem_object *obj; + int ret; + + ret = drm_gem_mmap(filp, vma); + if (ret) + return ret; + + obj = vma->vm_private_data; + + if (obj->import_attach) + return dma_buf_mmap(obj->dma_buf, vma, 0); + + return vs_gem_mmap_obj(obj, vma); +} diff --git a/drivers/gpu/drm/verisilicon/vs_gem.h b/drivers/gpu/drm/verisilicon/vs_gem.h new file mode 100644 index 000000000000..3a6d7452cb06 --- /dev/null +++ b/drivers/gpu/drm/verisilicon/vs_gem.h @@ -0,0 +1,72 @@ +/* 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_prime.h> + +#include "vs_drv.h" +/* + * + * @base: drm gem object. + * @size: size requested from user + * @cookie: cookie returned by dma_alloc_attrs + * - not kernel virtual address with DMA_ATTR_NO_KERNEL_MAPPING + * @dma_addr: bus address(accessed by dma) to allocated memory region. + * - this address could be physical address without IOMMU and + * device address with IOMMU. + * @dma_attrs: attribute for DMA API + * @get_pages: flag for manually applying for non-contiguous memory. + * @pages: Array of backing pages. + * @sgt: Imported sg_table. + * + */ +struct vs_gem_object { + struct drm_gem_object base; + size_t size; + void *cookie; + dma_addr_t dma_addr; + u32 iova; + unsigned long dma_attrs; + bool get_pages; + struct page **pages; + struct sg_table *sgt; +}; + +static inline +struct vs_gem_object *to_vs_gem_object(struct drm_gem_object *obj) +{ + return container_of(obj, struct vs_gem_object, base); +} + +struct vs_gem_object *vs_gem_create_object(struct drm_device *dev, + size_t size); + +int vs_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map); +void vs_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map); + +int vs_gem_prime_mmap(struct drm_gem_object *obj, + struct vm_area_struct *vma); + +int vs_gem_dumb_create(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args); + +int vs_gem_mmap(struct file *filp, struct vm_area_struct *vma); + +struct sg_table *vs_gem_prime_get_sg_table(struct drm_gem_object *obj); + +struct drm_gem_object *vs_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf); +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__ */