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gpu: nvgpu: add generic mmap handler API for sysmem

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Add a function nvgpu_dma_mmap_sys that enables
mapping nvgpu allocated memory into a valid
user VMA for linux.

Jira NVGPU-8129

Change-Id: Ic758b7a708c9851b39aedd066ee956ba74eb5bf2
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2731976
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Debarshi Dutta
2022-06-21 14:29:48 +05:30
committed by mobile promotions
parent 62c03dfaef
commit ee8403175d
2 changed files with 94 additions and 1 deletions
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70
drivers/gpu/nvgpu/os/linux/linux-dma.c
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@@ -338,6 +338,76 @@ print_dma_err:
return err;
}
int nvgpu_dma_mmap_sys(struct gk20a *g, struct vm_area_struct *vma, struct nvgpu_mem *mem)
{
struct device *d = dev_from_gk20a(g);
dma_addr_t iova;
unsigned long dma_attrs = 0;
int err;
unsigned long flags;
size_t size;
void *cpu_va;
struct vm_area_struct *vma_exists;
if (!nvgpu_mem_is_valid(mem)) {
return -EINVAL;
}
if (mem->aperture != APERTURE_SYSMEM) {
return -EINVAL;
}
if ((mem->size == 0) || (PAGE_ALIGN(mem->size) != mem->aligned_size)) {
return -EINVAL;
}
if ((vma->vm_end <= vma->vm_start) || (vma->vm_end - vma->vm_start > mem->size)) {
return -EINVAL;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
mmap_write_lock(vma->vm_mm);
#else
down_write(&vma->vm_mm->mmap_sem);
#endif
vma_exists = find_vma_intersection(vma->vm_mm, vma->vm_start, vma->vm_end);
if (vma_exists != NULL) {
err = -EEXIST;
goto done;
}
size = mem->aligned_size;
flags = mem->priv.flags;
nvgpu_dma_flags_to_attrs(g, &dma_attrs, flags);
if (nvgpu_nvlink_non_contig(g, flags)) {
err = remap_vmalloc_range(vma, mem->cpu_va, vma->vm_pgoff);
} else {
iova = sg_dma_address(mem->priv.sgt->sgl);
if (flags & NVGPU_DMA_NO_KERNEL_MAPPING) {
cpu_va = mem->priv.pages;
} else {
cpu_va = mem->cpu_va;
}
err = dma_mmap_attrs(d, vma, cpu_va, iova, size, dma_attrs);
}
done:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
mmap_write_unlock(vma->vm_mm);
#else
up_write(&vma->vm_mm->mmap_sem);
#endif
if (err != 0) {
nvgpu_err(g, "failed to map mem into userspace vma");
}
return err;
}
#if defined(CONFIG_NVGPU_DGPU)
int nvgpu_dma_alloc_flags_vid_at(struct gk20a *g, unsigned long flags,
size_t size, struct nvgpu_mem *mem, u64 at)