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hv:refine comment about intel integrated gpu dmar

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The dedicated DMAR unit for Intel integrated GPU
shall be available on the physical platform.
So remove the assert and add application constraint
in handle_one_drhd func.

Tracked-On: #4405

Signed-off-by: Junming Liu <junming.liu@intel.com>
Reviewed-by: Wu Binbin <binbin.wu@intel.com>
Reviewed-by: Wu Xiangyang <xiangyang.wu@linux.intel.com>
This commit is contained in:
Junming Liu
2020-02-26 09:55:51 +00:00
committed by wenlingz
parent 3098c4937b
commit 96f92373cd
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
hypervisor/acpi_parser/dmar_parse.c
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@@ -176,6 +176,10 @@ get_drhd_dev_scope_cnt(struct acpi_dmar_hardware_unit *drhd)
return count;
}
/**
* @Application constraint: The dedicated DMAR unit for Intel integrated GPU
* shall be available on the physical platform.
*/
static int32_t
handle_one_drhd(struct acpi_dmar_hardware_unit *acpi_drhd,
struct dmar_drhd *drhd)
@@ -210,7 +214,6 @@ handle_one_drhd(struct acpi_dmar_hardware_unit *acpi_drhd,
if (((drhd->segment << 16U) |
(dev_scope->bus << 8U) |
dev_scope->devfun) == CONFIG_GPU_SBDF) {
ASSERT(dev_count == 1, "no dedicated iommu for gpu");
drhd->ignore = true;
}
}