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native: Release output device files that are unused

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In order to make it possible to e.g. unload an unused DRM device, we
need to make sure that we don't keep the file descriptor open if we
don't need it; otherwise we block anyone from unloading the
corresponding module.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1828>
This commit is contained in:
Jonas Ådahl
2021-04-12 16:25:53 +02:00
parent 3c47661b78
commit ce5a5789bb
11 changed files with 426 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
src/backends/native/meta-kms-impl-device-atomic.c
View File

@ -602,6 +602,8 @@ process_page_flip_listener (MetaKmsImplDevice *impl_device,
GUINT_TO_POINTER (crtc_id),
page_flip_data);
meta_kms_impl_device_hold_fd (impl_device);
meta_topic (META_DEBUG_KMS,
"[atomic] Adding page flip data for (%u, %s): %p",
crtc_id,
@ -709,6 +711,8 @@ atomic_page_flip_handler (int fd,
if (!page_flip_data)
return;
meta_kms_impl_device_unhold_fd (impl_device);
meta_kms_page_flip_data_set_timings_in_impl (page_flip_data,
sequence, tv_sec, tv_usec);
meta_kms_impl_device_handle_page_flip_callback (impl_device, page_flip_data);
@ -1014,8 +1018,10 @@ dispose_page_flip_data (gpointer key,
gpointer user_data)
{
MetaKmsPageFlipData *page_flip_data = value;
MetaKmsImplDevice *impl_device = user_data;
meta_kms_page_flip_data_discard_in_impl (page_flip_data, NULL);
meta_kms_impl_device_unhold_fd (impl_device);
return TRUE;
}
@ -1028,7 +1034,7 @@ meta_kms_impl_device_atomic_prepare_shutdown (MetaKmsImplDevice *impl_device)
g_hash_table_foreach_remove (impl_device_atomic->page_flip_datas,
dispose_page_flip_data,
NULL);
impl_device);
}
static void
@ -1055,7 +1061,6 @@ meta_kms_impl_device_atomic_open_device_file (MetaKmsImplDevice *impl_device,
MetaDevicePool *device_pool =
meta_backend_native_get_device_pool (META_BACKEND_NATIVE (backend));
g_autoptr (MetaDeviceFile) device_file = NULL;
int fd;
device_file = meta_device_pool_open (device_pool, path,
META_DEVICE_FILE_FLAG_TAKE_CONTROL,
@ -1063,20 +1068,33 @@ meta_kms_impl_device_atomic_open_device_file (MetaKmsImplDevice *impl_device,
if (!device_file)
return NULL;
fd = meta_device_file_get_fd (device_file);
if (drmSetClientCap (fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1) != 0)
if (!meta_device_file_has_tag (device_file,
META_DEVICE_FILE_TAG_KMS,
META_KMS_DEVICE_FILE_TAG_ATOMIC))
{
g_set_error (error, META_KMS_ERROR, META_KMS_ERROR_NOT_SUPPORTED,
"DRM_CLIENT_CAP_UNIVERSAL_PLANES not supported");
return NULL;
}
int fd = meta_device_file_get_fd (device_file);
if (drmSetClientCap (fd, DRM_CLIENT_CAP_ATOMIC, 1) != 0)
{
g_set_error (error, META_KMS_ERROR, META_KMS_ERROR_NOT_SUPPORTED,
"DRM_CLIENT_CAP_ATOMIC not supported");
return NULL;
g_warn_if_fail (!meta_device_file_has_tag (device_file,
META_DEVICE_FILE_TAG_KMS,
META_KMS_DEVICE_FILE_TAG_SIMPLE));
if (drmSetClientCap (fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1) != 0)
{
g_set_error (error, META_KMS_ERROR, META_KMS_ERROR_NOT_SUPPORTED,
"DRM_CLIENT_CAP_UNIVERSAL_PLANES not supported");
return NULL;
}
if (drmSetClientCap (fd, DRM_CLIENT_CAP_ATOMIC, 1) != 0)
{
g_set_error (error, META_KMS_ERROR, META_KMS_ERROR_NOT_SUPPORTED,
"DRM_CLIENT_CAP_ATOMIC not supported");
return NULL;
}
meta_device_file_tag (device_file,
META_DEVICE_FILE_TAG_KMS,
META_KMS_DEVICE_FILE_TAG_ATOMIC);
}
return g_steal_pointer (&device_file);