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From 92c1fc52472f971df7011381e6dbcf5c6e2bdff1 Mon Sep 17 00:00:00 2001
From: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Date: Thu, 13 Jul 2017 12:00:20 -0400
Subject: [PATCH 1735/4131] drm/amdkfd: Support registering third pary device
memory
Register userptr that corresponds to third party device memory for GPU
access. Instead of userptr BO a doorbell BO will be created using the
physical address of the third party device memory. User space will treat
the doorbell BO as a regular userptr BO
BUG: KFD-351
Change-Id: I7ff5ded4ab0a90e01f984c1e0dc8067f09a35baa
Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 814ad7f..c254b52 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1194,7 +1194,9 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
struct kfd_dev *dev;
int idr_handle;
long err;
- uint64_t offset;
+ uint64_t offset = args->mmap_offset;
+ uint32_t flags = args->flags;
+ struct vm_area_struct *vma;
if (args->size == 0)
return -EINVAL;
@@ -1209,17 +1211,31 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
if (IS_ERR(pdd))
return PTR_ERR(pdd);
- if (args->flags & KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL) {
+ if (flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
+ /* Check if the userptr corresponds to another (or third-party)
+ * device local memory. If so treat is as a doorbell. User
+ * space will be oblivious of this and will use this doorbell
+ * BO as a regular userptr BO
+ */
+ vma = find_vma(current->mm, args->mmap_offset);
+ if (vma && (vma->vm_flags & VM_IO)) {
+ unsigned long pfn;
+
+ follow_pfn(vma, args->mmap_offset, &pfn);
+ flags |= KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL;
+ flags &= ~KFD_IOC_ALLOC_MEM_FLAGS_USERPTR;
+ offset = (pfn << PAGE_SHIFT);
+ }
+ } else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL) {
if (args->size != kfd_doorbell_process_slice(dev))
return -EINVAL;
offset = kfd_get_process_doorbells(dev, p);
- } else
- offset = args->mmap_offset;
+ }
err = dev->kfd2kgd->alloc_memory_of_gpu(
dev->kgd, args->va_addr, args->size,
pdd->vm, (struct kgd_mem **) &mem, &offset,
- NULL, args->flags);
+ NULL, flags);
if (err != 0)
return err;
--
2.7.4
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