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gpu/intel: remove deadlock during session destruction

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* use 'Id_space::apply_any' instead of 'for_each' to destroy session local
  buffer objects
* save session capability in session because 'cap()' is not valid in
  'Session_component' destructor because it was dissolved before calling
  'Root::_destruct_session', the cap is necessary to remove owned
  buffers from the EP

issue #4380
This commit is contained in:
Sebastian Sumpf 2022-01-20 14:15:07 +01:00 committed by Norman Feske
parent 7248957553
commit cd4d00f31a
1 changed files with 9 additions and 7 deletions
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16
repos/os/src/drivers/gpu/intel/main.cc
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@ -1480,6 +1480,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
Genode::Region_map &_rm;
Constrained_ram_allocator _ram;
Heap _heap { _ram, _rm };
Capability<Gpu::Session> _session_cap { cap() };
Igd::Device &_device;
Igd::Device::Vgpu _vgpu;
@ -1695,7 +1696,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
_apply_buffer(buffer_local, [&](Buffer &buffer) {
if (buffer.owner(cap()) == false) return false;
if (buffer.owner(_session_cap) == false) return false;
if (buffer.map.offset != Igd::Ggtt::Mapping::INVALID_OFFSET) {
_device.unmap_buffer(_heap, buffer.map);
@ -1716,7 +1717,8 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
_free_local_buffer(buffer_local);
};
_buffer_space.for_each<Buffer_local>(lookup_and_free);
while(_buffer_space.apply_any<Buffer_local>(
[&] (Buffer_local &buffer_local) { lookup_and_free(buffer_local); }));
}
/*********************************
@ -1810,7 +1812,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
Genode::Dataspace_capability ds_cap =
_device.alloc_buffer(_heap, size);
Buffer *buffer = new (&_heap) Buffer(ds_cap, cap());
Buffer *buffer = new (&_heap) Buffer(ds_cap, _session_cap);
_env.ep().manage(*buffer);
try {
new (&_heap) Buffer_local(buffer->cap(), size, _buffer_space, id);
@ -1843,7 +1845,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
_apply_buffer(buffer_local, [&](Buffer &buffer) {
if (buffer.owner(cap()) == false) return false;
if (buffer.owner(_session_cap) == false) return false;
if (buffer.map.offset != Igd::Ggtt::Mapping::INVALID_OFFSET) {
Genode::error("cannot free mapped buffer");
@ -1904,7 +1906,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
Genode::Dataspace_capability map_cap;
auto lookup_and_map = [&] (Buffer &buffer) {
if (buffer.owner(cap()) == false) {
if (buffer.owner(_session_cap) == false) {
Genode::error("GGTT mappings can only be done by buffer owner");
return false;
}
@ -1947,7 +1949,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
auto lookup_and_unmap = [&] (Buffer &buffer) {
if (buffer.owner(cap()) == false) {
if (buffer.owner(_session_cap) == false) {
Genode::error("GGTT unmappings can only be done by buffer owner");
return false;
}
@ -2071,7 +2073,7 @@ class Gpu::Session_component : public Genode::Session_object<Gpu::Session>
Buffer *b = nullptr;
auto lookup = [&] (Buffer &buffer) {
if (!buffer.map.cap.valid() || !buffer.owner(cap())) { return false; }
if (!buffer.map.cap.valid() || !buffer.owner(_session_cap)) { return false; }
b = &buffer;
return false;
};