Am 18.09.2017 um 14:35 schrieb Tom St Denis:
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);
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
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