[PATCH v3 8/8] drm/tyr: add gpuvas debugfs file

[Alvin Sun <alvin.sun@linux.dev>]

Add a gpuvas debugfs file listing all GPU VAs for the Tyr DRM driver.
Collects VMs into a shared list during firmware init and renders them
via dump_gpuva_info on read.

Signed-off-by: Alvin Sun <alvin.sun@linux.dev>
---
 drivers/gpu/drm/tyr/debugfs.rs | 20 ++++++++++++++++++++
 drivers/gpu/drm/tyr/driver.rs  | 10 ++++++++++
 drivers/gpu/drm/tyr/tyr.rs     |  1 +
 3 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/tyr/debugfs.rs b/drivers/gpu/drm/tyr/debugfs.rs
new file mode 100644
index 0000000000000..0e93c629829cd
--- /dev/null
+++ b/drivers/gpu/drm/tyr/debugfs.rs
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0 or MIT
+
+//! Debugfs support for the Tyr DRM driver.
+
+use kernel::{
+    debugfs::SeqShow,
+    prelude::*,
+    seq_file, //
+};
+
+use crate::driver::TyrDrmRegistrationData;
+
+/// `SeqShow` implementation for the `gpuvas` debugfs file.
+pub(crate) struct GpuvasShow;
+
+impl SeqShow<TyrDrmRegistrationData<'_>> for GpuvasShow {
+    fn show(reg_data: &TyrDrmRegistrationData<'_>, m: &seq_file::SeqFile) -> Result {
+        reg_data.vm_registry.for_each(|vm| vm.dump_gpuva_info(m))
+    }
+}
diff --git a/drivers/gpu/drm/tyr/driver.rs b/drivers/gpu/drm/tyr/driver.rs
index f26c3bb332e70..20be2dafa8421 100644
--- a/drivers/gpu/drm/tyr/driver.rs
+++ b/drivers/gpu/drm/tyr/driver.rs
@@ -7,6 +7,7 @@
         Clk,
         OptionalClk, //
     },
+    debugfs,
     device::{
         Bound,
         Core,
@@ -45,6 +46,7 @@
 };
 
 use crate::{
+    debugfs::GpuvasShow,
     file::TyrDrmFileData,
     fw::{
         irq::{
@@ -87,6 +89,9 @@ pub(crate) struct TyrDrmRegistrationData<'drm> {
     /// Firmware sections.
     pub(crate) fw: Arc<Firmware<'drm>>,
 
+    /// VM registry, used by debugfs to enumerate GPU VA spaces.
+    pub(crate) vm_registry: Arc<VmRegistry<'drm>>,
+
     #[pin]
     clks: Mutex<Clocks>,
 
@@ -198,6 +203,7 @@ fn probe<'bound>(
         let reg_data = pin_init!(TyrDrmRegistrationData {
                 pdev,
                 fw: firmware,
+                vm_registry: registry,
                 clks <- new_mutex!(Clocks {
                     core: core_clk,
                     stacks: stacks_clk,
@@ -252,6 +258,10 @@ impl drm::Driver for TyrDrmDriver {
     kernel::declare_drm_ioctls! {
         (PANTHOR_DEV_QUERY, drm_panthor_dev_query, ioctl::RENDER_ALLOW, TyrDrmFileData::dev_query),
     }
+
+    fn debugfs_init(dir: &debugfs::ScopeRef<'_, TyrDrmRegistrationData<'_>>) {
+        dir.seq_file::<GpuvasShow>(c"gpuvas");
+    }
 }
 
 struct Clocks {
diff --git a/drivers/gpu/drm/tyr/tyr.rs b/drivers/gpu/drm/tyr/tyr.rs
index e7ec450bdc9c0..6eb13c15d1657 100644
--- a/drivers/gpu/drm/tyr/tyr.rs
+++ b/drivers/gpu/drm/tyr/tyr.rs
@@ -7,6 +7,7 @@
 
 use crate::driver::TyrPlatformDriver;
 
+mod debugfs;
 mod driver;
 mod file;
 mod fw;

-- 
2.43.0