[PATCH v4 17/20] drm/tyr: validate presence of CSF shared section

[Deborah Brouwer]

The firmware binary must have a shared section for communicating with
the MCU. Check for this section after parsing and fail with -EINVAL if it
is missing.

Signed-off-by: Deborah Brouwer <deborah.brouwer@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/tyr/fw/parser.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/tyr/fw/parser.rs b/drivers/gpu/drm/tyr/fw/parser.rs
index 638707430701..0be3b740ea65 100644
--- a/drivers/gpu/drm/tyr/fw/parser.rs
+++ b/drivers/gpu/drm/tyr/fw/parser.rs
@@ -175,6 +175,19 @@ pub(super) fn parse(&mut self) -> Result<KVec<ParsedSection>> {
             }
         }
 
+        // Validate that the firmware contains the required shared memory section.
+        let has_shared_section = parsed_sections
+            .iter()
+            .any(|section| section.va.start == super::CSF_MCU_SHARED_REGION_START);
+
+        if !has_shared_section {
+            pr_err!(
+                "No shared section found at 0x{:08x} in firmware\n",
+                super::CSF_MCU_SHARED_REGION_START
+            );
+            return Err(EINVAL);
+        }
+
         Ok(parsed_sections)
     }
 

-- 
2.53.0