amdgpu: Add new function to get fd.
Dual purpose:
- The drm fd dedupe functionality confuses the radeonsi
amdgpu winsys if radeonsi isn't the first thing opening
the device. By exposing the fd we can detect this case.
- For a common mesa Vulkan sync objects implementation
with syncobj. (notable: no buffer allocation)
Both shouldn't interferece with libdrm_amdgpu functionality
though it does somewhat piece the abstraction of the library.
Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Gitlab: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3424
Gitlab: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5630
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
diff --git a/amdgpu/amdgpu-symbols.txt b/amdgpu/amdgpu-symbols.txt
index a2ed652..af2b643 100644
--- a/amdgpu/amdgpu-symbols.txt
+++ b/amdgpu/amdgpu-symbols.txt
@@ -53,6 +53,7 @@
amdgpu_cs_wait_fences
amdgpu_cs_wait_semaphore
amdgpu_device_deinitialize
+amdgpu_device_get_fd
amdgpu_device_initialize
amdgpu_find_bo_by_cpu_mapping
amdgpu_get_marketing_name
diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index b118dd4..cde8585 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -546,6 +546,19 @@
*/
int amdgpu_device_deinitialize(amdgpu_device_handle device_handle);
+/**
+ *
+ * /param device_handle - \c [in] Device handle.
+ * See #amdgpu_device_initialize()
+ *
+ * \return Returns the drm fd used for operations on this
+ * device. This is still owned by the library and hence
+ * should not be closed. Guaranteed to be valid until
+ * #amdgpu_device_deinitialize gets called.
+ *
+*/
+int amdgpu_device_get_fd(amdgpu_device_handle device_handle);
+
/*
* Memory Management
*
diff --git a/amdgpu/amdgpu_device.c b/amdgpu/amdgpu_device.c
index 76b4e5e..73fd27f 100644
--- a/amdgpu/amdgpu_device.c
+++ b/amdgpu/amdgpu_device.c
@@ -285,6 +285,11 @@
return 0;
}
+drm_public int amdgpu_device_get_fd(amdgpu_device_handle device_handle)
+{
+ return device_handle->fd;
+}
+
drm_public const char *amdgpu_get_marketing_name(amdgpu_device_handle dev)
{
return dev->marketing_name;
