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drm/amdgpu: Detect if amdgpu in IOMMU direct map mode

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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@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang
2021-12-06 21:10:52 -05:00
committed by Alex Deucher
parent a723c6d078
commit 4a74c38cd6
2 changed files with 21 additions and 0 deletions
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19
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -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>
@@ -3382,6 +3383,22 @@ 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,
@@ -3785,6 +3802,8 @@ fence_driver_init:
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: