diff options
Diffstat (limited to 'drivers/misc/habanalabs/memory.c')
| -rw-r--r-- | drivers/misc/habanalabs/memory.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c new file mode 100644 index 000000000000..ad14376a1c25 --- /dev/null +++ b/drivers/misc/habanalabs/memory.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright 2016-2019 HabanaLabs, Ltd. + * All Rights Reserved. + */ + +#include "habanalabs.h" + +#include <linux/uaccess.h> +#include <linux/slab.h> + +/* + * hl_pin_host_memory - pins a chunk of host memory + * + * @hdev : pointer to the habanalabs device structure + * @addr : the user-space virtual address of the memory area + * @size : the size of the memory area + * @userptr : pointer to hl_userptr structure + * + * This function does the following: + * - Pins the physical pages + * - Create a SG list from those pages + */ +int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u32 size, + struct hl_userptr *userptr) +{ + u64 start, end; + u32 npages, offset; + int rc; + + if (!size) { + dev_err(hdev->dev, "size to pin is invalid - %d\n", + size); + return -EINVAL; + } + + if (!access_ok((void __user *) (uintptr_t) addr, size)) { + dev_err(hdev->dev, "user pointer is invalid - 0x%llx\n", + addr); + return -EFAULT; + } + + /* + * If the combination of the address and size requested for this memory + * region causes an integer overflow, return error. + */ + if (((addr + size) < addr) || + PAGE_ALIGN(addr + size) < (addr + size)) { + dev_err(hdev->dev, + "user pointer 0x%llx + %u causes integer overflow\n", + addr, size); + return -EINVAL; + } + + start = addr & PAGE_MASK; + offset = addr & ~PAGE_MASK; + end = PAGE_ALIGN(addr + size); + npages = (end - start) >> PAGE_SHIFT; + + userptr->size = size; + userptr->addr = addr; + userptr->dma_mapped = false; + INIT_LIST_HEAD(&userptr->job_node); + + userptr->vec = frame_vector_create(npages); + if (!userptr->vec) { + dev_err(hdev->dev, "Failed to create frame vector\n"); + return -ENOMEM; + } + + rc = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE, + userptr->vec); + + if (rc != npages) { + dev_err(hdev->dev, + "Failed to map host memory, user ptr probably wrong\n"); + if (rc < 0) + goto destroy_framevec; + rc = -EFAULT; + goto put_framevec; + } + + if (frame_vector_to_pages(userptr->vec) < 0) { + dev_err(hdev->dev, + "Failed to translate frame vector to pages\n"); + rc = -EFAULT; + goto put_framevec; + } + + userptr->sgt = kzalloc(sizeof(*userptr->sgt), GFP_ATOMIC); + if (!userptr->sgt) { + rc = -ENOMEM; + goto put_framevec; + } + + rc = sg_alloc_table_from_pages(userptr->sgt, + frame_vector_pages(userptr->vec), + npages, offset, size, GFP_ATOMIC); + if (rc < 0) { + dev_err(hdev->dev, "failed to create SG table from pages\n"); + goto free_sgt; + } + + return 0; + +free_sgt: + kfree(userptr->sgt); +put_framevec: + put_vaddr_frames(userptr->vec); +destroy_framevec: + frame_vector_destroy(userptr->vec); + return rc; +} + +/* + * hl_unpin_host_memory - unpins a chunk of host memory + * + * @hdev : pointer to the habanalabs device structure + * @userptr : pointer to hl_userptr structure + * + * This function does the following: + * - Unpins the physical pages related to the host memory + * - Free the SG list + */ +int hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr) +{ + struct page **pages; + + if (userptr->dma_mapped) + hdev->asic_funcs->hl_dma_unmap_sg(hdev, + userptr->sgt->sgl, + userptr->sgt->nents, + userptr->dir); + + pages = frame_vector_pages(userptr->vec); + if (!IS_ERR(pages)) { + int i; + + for (i = 0; i < frame_vector_count(userptr->vec); i++) + set_page_dirty_lock(pages[i]); + } + put_vaddr_frames(userptr->vec); + frame_vector_destroy(userptr->vec); + + list_del(&userptr->job_node); + + sg_free_table(userptr->sgt); + kfree(userptr->sgt); + + return 0; +} + +/* + * hl_userptr_delete_list - clear userptr list + * + * @hdev : pointer to the habanalabs device structure + * @userptr_list : pointer to the list to clear + * + * This function does the following: + * - Iterates over the list and unpins the host memory and frees the userptr + * structure. + */ +void hl_userptr_delete_list(struct hl_device *hdev, + struct list_head *userptr_list) +{ + struct hl_userptr *userptr, *tmp; + + list_for_each_entry_safe(userptr, tmp, userptr_list, job_node) { + hl_unpin_host_memory(hdev, userptr); + kfree(userptr); + } + + INIT_LIST_HEAD(userptr_list); +} + +/* + * hl_userptr_is_pinned - returns whether the given userptr is pinned + * + * @hdev : pointer to the habanalabs device structure + * @userptr_list : pointer to the list to clear + * @userptr : pointer to userptr to check + * + * This function does the following: + * - Iterates over the list and checks if the given userptr is in it, means is + * pinned. If so, returns true, otherwise returns false. + */ +bool hl_userptr_is_pinned(struct hl_device *hdev, u64 addr, + u32 size, struct list_head *userptr_list, + struct hl_userptr **userptr) +{ + list_for_each_entry((*userptr), userptr_list, job_node) { + if ((addr == (*userptr)->addr) && (size == (*userptr)->size)) + return true; + } + + return false; +} |