diff options
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 90 |
1 files changed, 13 insertions, 77 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 0e5f78f3a97e..ce435dbbb398 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -1784,98 +1784,34 @@ static ssize_t amdgpu_iova_to_phys_read(struct file *f, char __user *buf, size_t size, loff_t *pos) { struct amdgpu_device *adev = file_inode(f)->i_private; - ssize_t result, n; int r; uint64_t phys; - void *ptr; struct iommu_domain *dom; - dom = iommu_get_domain_for_dev(adev->dev); - if (!dom) - return -EFAULT; - - result = 0; - while (size) { - // get physical address and map - phys = iommu_iova_to_phys(dom, *pos); - - // copy upto one page - if (size > PAGE_SIZE) - n = PAGE_SIZE; - else - n = size; - - // to end of the page - if (((*pos & (PAGE_SIZE - 1)) + n) >= PAGE_SIZE) - n = PAGE_SIZE - (*pos & (PAGE_SIZE - 1)); - - ptr = kmap(pfn_to_page(PFN_DOWN(phys))); - if (!ptr) - return -EFAULT; - - r = copy_to_user(buf, ptr, n); - kunmap(pfn_to_page(PFN_DOWN(phys))); - if (r) - return -EFAULT; - - *pos += n; - size -= n; - result += n; - } - - return result; -} + // always return 8 bytes + if (size != 8) + return -EINVAL; -static ssize_t amdgpu_iova_to_phys_write(struct file *f, const char __user *buf, - size_t size, loff_t *pos) -{ - struct amdgpu_device *adev = file_inode(f)->i_private; - ssize_t result, n; - int r; - uint64_t phys; - void *ptr; - struct iommu_domain *dom; + // only accept page addresses + if (*pos & 0xFFF) + return -EINVAL; dom = iommu_get_domain_for_dev(adev->dev); - if (!dom) - return -EFAULT; - - result = 0; - while (size) { - // get physical address and map + if (dom) phys = iommu_iova_to_phys(dom, *pos); + else + phys = *pos; - // copy upto one page - if (size > PAGE_SIZE) - n = PAGE_SIZE; - else - n = size; - - // to end of the page - if (((*pos & (PAGE_SIZE - 1)) + n) >= PAGE_SIZE) - n = PAGE_SIZE - (*pos & (PAGE_SIZE - 1)); - - ptr = kmap(pfn_to_page(PFN_DOWN(phys))); - if (!ptr) - return -EFAULT; - - r = copy_from_user(ptr, buf, n); - kunmap(pfn_to_page(PFN_DOWN(phys))); - if (r) - return -EFAULT; - - *pos += n; - size -= n; - result += n; - } + r = copy_to_user(buf, &phys, 8); + if (r) + return -EFAULT; - return result; + return 8; } static const struct file_operations amdgpu_ttm_iova_fops = { .owner = THIS_MODULE, .read = amdgpu_iova_to_phys_read, - .write = amdgpu_iova_to_phys_write, .llseek = default_llseek }; |