drm/amdkfd: Use kfd fd to mmap mmio

TTM doesn't support CPU mapping of sg type bo (under which
mmio bo is created). Switch mmaping of mmio page to kfd
device file.

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Acked-by: Christian Konig <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 38ae53fe81829eae7f8b0ca8d58acfea337e2bbc..c92e931ceb2704858d14252317428438c14d02ff 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1309,6 +1309,14 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
        args->handle = MAKE_HANDLE(args->gpu_id, idr_handle);
        args->mmap_offset = offset;
 
+       /* MMIO is mapped through kfd device
+        * Generate a kfd mmap offset
+        */
+       if (flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP) {
+               args->mmap_offset = KFD_MMAP_TYPE_MMIO | KFD_MMAP_GPU_ID(args->gpu_id);
+               args->mmap_offset <<= PAGE_SHIFT;
+       }
+
        return 0;
 
 err_free:
@@ -1853,6 +1861,39 @@ err_i1:
        return retcode;
 }
 
+static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process,
+                     struct vm_area_struct *vma)
+{
+       phys_addr_t address;
+       int ret;
+
+       if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+               return -EINVAL;
+
+       address = amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd);
+
+       vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |
+                               VM_DONTDUMP | VM_PFNMAP;
+
+       vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+       pr_debug("Process %d mapping mmio page\n"
+                "     target user address == 0x%08llX\n"
+                "     physical address    == 0x%08llX\n"
+                "     vm_flags            == 0x%04lX\n"
+                "     size                == 0x%04lX\n",
+                process->pasid, (unsigned long long) vma->vm_start,
+                address, vma->vm_flags, PAGE_SIZE);
+
+       ret = io_remap_pfn_range(vma,
+                               vma->vm_start,
+                               address >> PAGE_SHIFT,
+                               PAGE_SIZE,
+                               vma->vm_page_prot);
+       return ret;
+}
+
+
 static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 {
        struct kfd_process *process;
@@ -1883,6 +1924,10 @@ static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
                if (!dev)
                        return -ENODEV;
                return kfd_reserved_mem_mmap(dev, process, vma);
+       case KFD_MMAP_TYPE_MMIO:
+               if (!dev)
+                       return -ENODEV;
+               return kfd_mmio_mmap(dev, process, vma);
        }
 
        return -EFAULT;

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 8f02d781716297c2c7357820b9dab98b927085db..b44ea00ded9d989b5979f7022053710c2690ba31 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -59,6 +59,7 @@
 #define KFD_MMAP_TYPE_DOORBELL (0x3ULL << KFD_MMAP_TYPE_SHIFT)
 #define KFD_MMAP_TYPE_EVENTS   (0x2ULL << KFD_MMAP_TYPE_SHIFT)
 #define KFD_MMAP_TYPE_RESERVED_MEM     (0x1ULL << KFD_MMAP_TYPE_SHIFT)
+#define KFD_MMAP_TYPE_MMIO     (0x0ULL << KFD_MMAP_TYPE_SHIFT)
 
 #define KFD_MMAP_GPU_ID_SHIFT (46 - PAGE_SHIFT)
 #define KFD_MMAP_GPU_ID_MASK (((1ULL << KFD_GPU_ID_HASH_WIDTH) - 1) \