If host and amdgpu IOMMU is not enabled or IOMMU is pass through mode,
set adev->ram_is_direct_mapped flag which will be used to optimize
memory usage for multi GPU mappings.
Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 ++
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 19 +++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 54c882a6b433..0ec19c83a203 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1097,6 +1097,8 @@ struct amdgpu_device {
struct amdgpu_reset_control *reset_cntl;
uint32_t ip_versions[MAX_HWIP][HWIP_MAX_INSTANCE];
+
+ bool ram_is_direct_mapped;
};
static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index ce9bdef185c0..3318d92de8eb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -30,6 +30,7 @@
#include <linux/module.h>
#include <linux/console.h>
#include <linux/slab.h>
+#include <linux/iommu.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_probe_helper.h>
@@ -3381,6 +3382,22 @@ static int amdgpu_device_get_job_timeout_settings(struct amdgpu_device *adev)
return ret;
}
+/**
+ * amdgpu_device_check_iommu_direct_map - check if RAM direct mapped to GPU
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * RAM direct mapped to GPU if IOMMU is not enabled or is pass through mode
+ */
+static void amdgpu_device_check_iommu_direct_map(struct amdgpu_device *adev)
+{
+ struct iommu_domain *domain;
+
+ domain = iommu_get_domain_for_dev(adev->dev);
+ if (!domain || domain->type == IOMMU_DOMAIN_IDENTITY)
+ adev->ram_is_direct_mapped = true;
+}
+
static const struct attribute *amdgpu_dev_attributes[] = {
&dev_attr_product_name.attr,
&dev_attr_product_number.attr,
@@ -3784,6 +3801,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
queue_delayed_work(system_wq, &mgpu_info.delayed_reset_work,
msecs_to_jiffies(AMDGPU_RESUME_MS));
+ amdgpu_device_check_iommu_direct_map(adev);
+
return 0;
release_ras_con:
--
2.17.1
