Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7848ffa99eb4..b4c298925e2a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -43,6 +43,7 @@
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/debugfs.h>
+#include <linux/iommu.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
#include "bif/bif_4_1_d.h"
@@ -1810,6 +1811,36 @@ static const struct file_operations amdgpu_ttm_gtt_fops = {
#endif
+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;
+ int r;
+ uint64_t phys;
+
+ // always return 8 bytes
+ if (size != 8)
+ return -EINVAL;
+
+ // only accept page addresses
+ if (*pos & 0xFFF)
+ return -EINVAL;
+
+
+ phys = iommu_iova_to_phys(iommu_get_domain_for_dev(adev->dev), *pos);
+
+ r = copy_to_user(buf, &phys, 8);
+ if (r)
+ return -EFAULT;
+
+ return 8;
+}
+
+static const struct file_operations amdgpu_ttm_iova_fops = {
+ .owner = THIS_MODULE,
+ .read = amdgpu_iova_to_phys_read,
+ .llseek = default_llseek
+};
static const struct {
char *name;
@@ -1819,6 +1850,7 @@ static const struct {
#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
{ "amdgpu_gtt", &amdgpu_ttm_gtt_fops },
#endif
+ { "amdgpu_iova", &amdgpu_ttm_iova_fops },
};
#endif
--
2.12.0
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