Am 18.09.2017 um 14:35 schrieb Tom St Denis:
Signed-off-by: Tom St Denis tom.stdenis@amd.com
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);
Well how about adding directly read/write support for the page behind the address?
This way we won't need to fiddle with /dev/mem any more either.
Christian.
- 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