summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/rockchip/rockchip_drm_gem.c')
-rw-r--r--drivers/gpu/drm/rockchip/rockchip_drm_gem.c551
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
new file mode 100644
index 0000000000..93ed841f5d
--- /dev/null
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -0,0 +1,551 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
+ * Author:Mark Yao <mark.yao@rock-chips.com>
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/iommu.h>
+#include <linux/vmalloc.h>
+
+#include <drm/drm.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_prime.h>
+#include <drm/drm_vma_manager.h>
+
+#include "rockchip_drm_drv.h"
+#include "rockchip_drm_gem.h"
+
+static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+ int prot = IOMMU_READ | IOMMU_WRITE;
+ ssize_t ret;
+
+ mutex_lock(&private->mm_lock);
+ ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
+ rk_obj->base.size, PAGE_SIZE,
+ 0, 0);
+ mutex_unlock(&private->mm_lock);
+
+ if (ret < 0) {
+ DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
+ return ret;
+ }
+
+ rk_obj->dma_addr = rk_obj->mm.start;
+
+ ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt,
+ prot);
+ if (ret < (ssize_t)rk_obj->base.size) {
+ DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
+ ret, rk_obj->base.size);
+ ret = -ENOMEM;
+ goto err_remove_node;
+ }
+
+ rk_obj->size = ret;
+
+ return 0;
+
+err_remove_node:
+ mutex_lock(&private->mm_lock);
+ drm_mm_remove_node(&rk_obj->mm);
+ mutex_unlock(&private->mm_lock);
+
+ return ret;
+}
+
+static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+
+ iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
+
+ mutex_lock(&private->mm_lock);
+
+ drm_mm_remove_node(&rk_obj->mm);
+
+ mutex_unlock(&private->mm_lock);
+
+ return 0;
+}
+
+static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_device *drm = rk_obj->base.dev;
+ int ret, i;
+ struct scatterlist *s;
+
+ rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
+ if (IS_ERR(rk_obj->pages))
+ return PTR_ERR(rk_obj->pages);
+
+ rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
+
+ rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev,
+ rk_obj->pages, rk_obj->num_pages);
+ if (IS_ERR(rk_obj->sgt)) {
+ ret = PTR_ERR(rk_obj->sgt);
+ goto err_put_pages;
+ }
+
+ /*
+ * Fake up the SG table so that dma_sync_sg_for_device() can be used
+ * to flush the pages associated with it.
+ *
+ * TODO: Replace this by drm_clflush_sg() once it can be implemented
+ * without relying on symbols that are not exported.
+ */
+ for_each_sgtable_sg(rk_obj->sgt, s, i)
+ sg_dma_address(s) = sg_phys(s);
+
+ dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE);
+
+ return 0;
+
+err_put_pages:
+ drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
+ return ret;
+}
+
+static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
+{
+ sg_free_table(rk_obj->sgt);
+ kfree(rk_obj->sgt);
+ drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
+}
+
+static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
+{
+ int ret;
+
+ ret = rockchip_gem_get_pages(rk_obj);
+ if (ret < 0)
+ return ret;
+
+ ret = rockchip_gem_iommu_map(rk_obj);
+ if (ret < 0)
+ goto err_free;
+
+ if (alloc_kmap) {
+ rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+ if (!rk_obj->kvaddr) {
+ DRM_ERROR("failed to vmap() buffer\n");
+ ret = -ENOMEM;
+ goto err_unmap;
+ }
+ }
+
+ return 0;
+
+err_unmap:
+ rockchip_gem_iommu_unmap(rk_obj);
+err_free:
+ rockchip_gem_put_pages(rk_obj);
+
+ return ret;
+}
+
+static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+
+ rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
+
+ if (!alloc_kmap)
+ rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
+
+ rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
+ &rk_obj->dma_addr, GFP_KERNEL,
+ rk_obj->dma_attrs);
+ if (!rk_obj->kvaddr) {
+ DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
+ bool alloc_kmap)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+
+ if (private->domain)
+ return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
+ else
+ return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
+}
+
+static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
+{
+ vunmap(rk_obj->kvaddr);
+ rockchip_gem_iommu_unmap(rk_obj);
+ rockchip_gem_put_pages(rk_obj);
+}
+
+static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
+{
+ struct drm_gem_object *obj = &rk_obj->base;
+ struct drm_device *drm = obj->dev;
+
+ dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
+ rk_obj->dma_attrs);
+}
+
+static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
+{
+ if (rk_obj->pages)
+ rockchip_gem_free_iommu(rk_obj);
+ else
+ rockchip_gem_free_dma(rk_obj);
+}
+
+static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ unsigned int count = obj->size >> PAGE_SHIFT;
+ unsigned long user_count = vma_pages(vma);
+
+ if (user_count == 0)
+ return -ENXIO;
+
+ return vm_map_pages(vma, rk_obj->pages, count);
+}
+
+static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ struct drm_device *drm = obj->dev;
+
+ return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
+ obj->size, rk_obj->dma_attrs);
+}
+
+static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ int ret;
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ /*
+ * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
+ * whole buffer from the start.
+ */
+ vma->vm_pgoff = 0;
+
+ /*
+ * We allocated a struct page table for rk_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);
+
+ if (rk_obj->pages)
+ ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
+ else
+ ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
+
+ return ret;
+}
+
+static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
+{
+ drm_gem_object_release(&rk_obj->base);
+ kfree(rk_obj);
+}
+
+static const struct drm_gem_object_funcs rockchip_gem_object_funcs = {
+ .free = rockchip_gem_free_object,
+ .get_sg_table = rockchip_gem_prime_get_sg_table,
+ .vmap = rockchip_gem_prime_vmap,
+ .vunmap = rockchip_gem_prime_vunmap,
+ .mmap = rockchip_drm_gem_object_mmap,
+ .vm_ops = &drm_gem_dma_vm_ops,
+};
+
+static struct rockchip_gem_object *
+ rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
+{
+ struct rockchip_gem_object *rk_obj;
+ struct drm_gem_object *obj;
+
+ size = round_up(size, PAGE_SIZE);
+
+ rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
+ if (!rk_obj)
+ return ERR_PTR(-ENOMEM);
+
+ obj = &rk_obj->base;
+
+ obj->funcs = &rockchip_gem_object_funcs;
+
+ drm_gem_object_init(drm, obj, size);
+
+ return rk_obj;
+}
+
+struct rockchip_gem_object *
+rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
+ bool alloc_kmap)
+{
+ struct rockchip_gem_object *rk_obj;
+ int ret;
+
+ rk_obj = rockchip_gem_alloc_object(drm, size);
+ if (IS_ERR(rk_obj))
+ return rk_obj;
+
+ ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
+ if (ret)
+ goto err_free_rk_obj;
+
+ return rk_obj;
+
+err_free_rk_obj:
+ rockchip_gem_release_object(rk_obj);
+ return ERR_PTR(ret);
+}
+
+/*
+ * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free
+ * callback function
+ */
+void rockchip_gem_free_object(struct drm_gem_object *obj)
+{
+ struct drm_device *drm = obj->dev;
+ struct rockchip_drm_private *private = drm->dev_private;
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ if (obj->import_attach) {
+ if (private->domain) {
+ rockchip_gem_iommu_unmap(rk_obj);
+ } else {
+ dma_unmap_sgtable(drm->dev, rk_obj->sgt,
+ DMA_BIDIRECTIONAL, 0);
+ }
+ drm_prime_gem_destroy(obj, rk_obj->sgt);
+ } else {
+ rockchip_gem_free_buf(rk_obj);
+ }
+
+ rockchip_gem_release_object(rk_obj);
+}
+
+/*
+ * rockchip_gem_create_with_handle - allocate an object with the given
+ * size and create a gem handle on it
+ *
+ * returns a struct rockchip_gem_object* on success or ERR_PTR values
+ * on failure.
+ */
+static struct rockchip_gem_object *
+rockchip_gem_create_with_handle(struct drm_file *file_priv,
+ struct drm_device *drm, unsigned int size,
+ unsigned int *handle)
+{
+ struct rockchip_gem_object *rk_obj;
+ struct drm_gem_object *obj;
+ bool is_framebuffer;
+ int ret;
+
+ is_framebuffer = drm->fb_helper && file_priv == drm->fb_helper->client.file;
+
+ rk_obj = rockchip_gem_create_object(drm, size, is_framebuffer);
+ if (IS_ERR(rk_obj))
+ return ERR_CAST(rk_obj);
+
+ obj = &rk_obj->base;
+
+ /*
+ * allocate a id of idr table where the obj is registered
+ * and handle has the id what user can see.
+ */
+ ret = drm_gem_handle_create(file_priv, obj, handle);
+ if (ret)
+ goto err_handle_create;
+
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_put(obj);
+
+ return rk_obj;
+
+err_handle_create:
+ rockchip_gem_free_object(obj);
+
+ return ERR_PTR(ret);
+}
+
+/*
+ * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
+ * function
+ *
+ * This aligns the pitch and size arguments to the minimum required. wrap
+ * this into your own function if you need bigger alignment.
+ */
+int rockchip_gem_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct rockchip_gem_object *rk_obj;
+ int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+
+ /*
+ * align to 64 bytes since Mali requires it.
+ */
+ args->pitch = ALIGN(min_pitch, 64);
+ args->size = args->pitch * args->height;
+
+ rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
+ &args->handle);
+
+ return PTR_ERR_OR_ZERO(rk_obj);
+}
+
+/*
+ * Allocate a sg_table for this GEM object.
+ * Note: Both the table's contents, and the sg_table itself must be freed by
+ * the caller.
+ * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
+ */
+struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+ struct drm_device *drm = obj->dev;
+ struct sg_table *sgt;
+ int ret;
+
+ if (rk_obj->pages)
+ return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages);
+
+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return ERR_PTR(-ENOMEM);
+
+ ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
+ rk_obj->dma_addr, obj->size,
+ rk_obj->dma_attrs);
+ if (ret) {
+ DRM_ERROR("failed to allocate sgt, %d\n", ret);
+ kfree(sgt);
+ return ERR_PTR(ret);
+ }
+
+ return sgt;
+}
+
+static int
+rockchip_gem_iommu_map_sg(struct drm_device *drm,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sg,
+ struct rockchip_gem_object *rk_obj)
+{
+ rk_obj->sgt = sg;
+ return rockchip_gem_iommu_map(rk_obj);
+}
+
+static int
+rockchip_gem_dma_map_sg(struct drm_device *drm,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sg,
+ struct rockchip_gem_object *rk_obj)
+{
+ int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
+ if (err)
+ return err;
+
+ if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
+ DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
+ dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
+ return -EINVAL;
+ }
+
+ rk_obj->dma_addr = sg_dma_address(sg->sgl);
+ rk_obj->sgt = sg;
+ return 0;
+}
+
+struct drm_gem_object *
+rockchip_gem_prime_import_sg_table(struct drm_device *drm,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sg)
+{
+ struct rockchip_drm_private *private = drm->dev_private;
+ struct rockchip_gem_object *rk_obj;
+ int ret;
+
+ rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
+ if (IS_ERR(rk_obj))
+ return ERR_CAST(rk_obj);
+
+ if (private->domain)
+ ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
+ else
+ ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
+
+ if (ret < 0) {
+ DRM_ERROR("failed to import sg table: %d\n", ret);
+ goto err_free_rk_obj;
+ }
+
+ return &rk_obj->base;
+
+err_free_rk_obj:
+ rockchip_gem_release_object(rk_obj);
+ return ERR_PTR(ret);
+}
+
+int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ if (rk_obj->pages) {
+ void *vaddr;
+
+ if (rk_obj->kvaddr)
+ vaddr = rk_obj->kvaddr;
+ else
+ vaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
+ pgprot_writecombine(PAGE_KERNEL));
+
+ if (!vaddr)
+ return -ENOMEM;
+ iosys_map_set_vaddr(map, vaddr);
+ return 0;
+ }
+
+ if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
+ return -ENOMEM;
+ iosys_map_set_vaddr(map, rk_obj->kvaddr);
+
+ return 0;
+}
+
+void rockchip_gem_prime_vunmap(struct drm_gem_object *obj,
+ struct iosys_map *map)
+{
+ struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
+
+ if (rk_obj->pages) {
+ if (map->vaddr != rk_obj->kvaddr)
+ vunmap(map->vaddr);
+ return;
+ }
+
+ /* Nothing to do if allocated by DMA mapping API. */
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-09 07:39:21 +0000