[PATCH v4 06/12] drm/panthor: New function for FW section map flags

[Ketil Johnsen <ketil.johnsen@arm.com>]

From: Boris Brezillon <boris.brezillon@collabora.com>

This refactors the VM map flags for FW sections into a new function
called section_vm_map_flags().
This comes in handly for future handling of protected FW sections
(type CSF_FW_BINARY_IFACE_ENTRY_PROT).

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Co-developed-by: Ketil Johnsen <ketil.johnsen@arm.com>
Signed-off-by: Ketil Johnsen <ketil.johnsen@arm.com>

---

v4:
- First version of this change as a separate commit
---
 drivers/gpu/drm/panthor/panthor_fw.c | 44 ++++++++++++++++------------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_fw.c b/drivers/gpu/drm/panthor/panthor_fw.c
index e639ffeac7a32..7b8c90b19f4fe 100644
--- a/drivers/gpu/drm/panthor/panthor_fw.c
+++ b/drivers/gpu/drm/panthor/panthor_fw.c
@@ -543,6 +543,31 @@ panthor_fw_alloc_suspend_buf_mem(struct panthor_device *ptdev, size_t size)
 					"FW suspend buffer");
 }
 
+static u32 section_vm_map_flags(const struct panthor_fw_section *section)
+{
+	u32 cache_mode = section->flags &
+			 CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_MASK;
+	u32 vm_map_flags = 0;
+
+	if (!(section->flags & CSF_FW_BINARY_IFACE_ENTRY_WR))
+		vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_READONLY;
+
+	if (!(section->flags & CSF_FW_BINARY_IFACE_ENTRY_EX))
+		vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC;
+
+	/* TODO: CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_*_COHERENT are mapped to
+	 * non-cacheable for now. We might want to introduce a new
+	 * IOMMU_xxx flag (or abuse IOMMU_MMIO, which maps to device
+	 * memory and is currently not used by our driver) for
+	 * AS_MEMATTR_AARCH64_SHARED memory, so we can take benefit
+	 * of IO-coherent systems.
+	 */
+	if (cache_mode != CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_CACHED)
+		vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED;
+
+	return vm_map_flags;
+}
+
 static int panthor_fw_load_section_entry(struct panthor_device *ptdev,
 					 const struct firmware *fw,
 					 struct panthor_fw_binary_iter *iter,
@@ -645,26 +670,9 @@ static int panthor_fw_load_section_entry(struct panthor_device *ptdev,
 	}
 
 	if (section_size) {
-		u32 cache_mode = hdr.flags & CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_MASK;
-		u32 vm_map_flags = 0;
+		u32 vm_map_flags = section_vm_map_flags(section);
 		u64 va = hdr.va.start;
 
-		if (!(hdr.flags & CSF_FW_BINARY_IFACE_ENTRY_WR))
-			vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_READONLY;
-
-		if (!(hdr.flags & CSF_FW_BINARY_IFACE_ENTRY_EX))
-			vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC;
-
-		/* TODO: CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_*_COHERENT are mapped to
-		 * non-cacheable for now. We might want to introduce a new
-		 * IOMMU_xxx flag (or abuse IOMMU_MMIO, which maps to device
-		 * memory and is currently not used by our driver) for
-		 * AS_MEMATTR_AARCH64_SHARED memory, so we can take benefit
-		 * of IO-coherent systems.
-		 */
-		if (cache_mode != CSF_FW_BINARY_IFACE_ENTRY_CACHE_MODE_CACHED)
-			vm_map_flags |= DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED;
-
 		section->mem = panthor_kernel_bo_create(ptdev, panthor_fw_vm(ptdev),
 							section_size,
 							DRM_PANTHOR_BO_NO_MMAP,
-- 
2.43.0