Prepare the work for drm_panic support. This is used to map the
current framebuffer, so the CPU can overwrite it with the panic
message.
Signed-off-by: Jocelyn Falempe <jfale...@redhat.com>
---
v5:
* Use iosys_map for intel_bo_panic_map().
drivers/gpu/drm/i915/display/intel_bo.c | 5 ++++
drivers/gpu/drm/i915/display/intel_bo.h | 1 +
drivers/gpu/drm/i915/gem/i915_gem_object.h | 2 ++
drivers/gpu/drm/i915/gem/i915_gem_pages.c | 29 ++++++++++++++++++++++
drivers/gpu/drm/xe/display/intel_bo.c | 10 ++++++++
5 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_bo.c
b/drivers/gpu/drm/i915/display/intel_bo.c
index fbd16d7b58d95..ac904e9ec7d51 100644
--- a/drivers/gpu/drm/i915/display/intel_bo.c
+++ b/drivers/gpu/drm/i915/display/intel_bo.c
@@ -57,3 +57,8 @@ void intel_bo_describe(struct seq_file *m, struct
drm_gem_object *obj)
{
i915_debugfs_describe_obj(m, to_intel_bo(obj));
}
+
+void intel_bo_panic_map(struct drm_gem_object *obj, struct iosys_map *map)
+{
+ i915_gem_object_panic_map(to_intel_bo(obj), map);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_bo.h
b/drivers/gpu/drm/i915/display/intel_bo.h
index ea7a2253aaa57..5b6c63d99786a 100644
--- a/drivers/gpu/drm/i915/display/intel_bo.h
+++ b/drivers/gpu/drm/i915/display/intel_bo.h
@@ -23,5 +23,6 @@ struct intel_frontbuffer *intel_bo_set_frontbuffer(struct
drm_gem_object *obj,
struct intel_frontbuffer
*front);
void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj);
+void intel_bo_panic_map(struct drm_gem_object *obj, struct iosys_map *map);
#endif /* __INTEL_BO__ */
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h
b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index a5f34542135ce..b16092707ea5a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -692,6 +692,8 @@ i915_gem_object_unpin_pages(struct drm_i915_gem_object *obj)
int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
int i915_gem_object_truncate(struct drm_i915_gem_object *obj);
+void i915_gem_object_panic_map(struct drm_i915_gem_object *obj, struct
iosys_map *map);
+
/**
* i915_gem_object_pin_map - return a contiguous mapping of the entire object
* @obj: the object to map into kernel address space
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 8780aa2431053..718bea6474d7f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -355,6 +355,35 @@ static void *i915_gem_object_map_pfn(struct
drm_i915_gem_object *obj,
return vaddr ?: ERR_PTR(-ENOMEM);
}
+/* Map the current framebuffer for CPU access. Called from panic handler, so no
+ * need to pin or cleanup.
+ */
+void i915_gem_object_panic_map(struct drm_i915_gem_object *obj, struct
iosys_map *map)
+{
+ enum i915_map_type has_type;
+ void *ptr;
+
+ ptr = page_unpack_bits(obj->mm.mapping, &has_type);
+
+
+ if (!ptr) {
+ if (i915_gem_object_has_struct_page(obj))
+ ptr = i915_gem_object_map_page(obj, I915_MAP_WB);
+ else
+ ptr = i915_gem_object_map_pfn(obj, I915_MAP_WB);
+
+ if (IS_ERR(ptr))
+ return;
+
+ obj->mm.mapping = page_pack_bits(ptr, I915_MAP_WB);
+ }
+
+ if (i915_gem_object_has_iomem(obj))
+ iosys_map_set_vaddr_iomem(map, (void __iomem *) ptr);
+ else
+ iosys_map_set_vaddr(map, ptr);
+}
+
/* get, pin, and map the pages of the object into kernel space */
void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
enum i915_map_type type)
diff --git a/drivers/gpu/drm/xe/display/intel_bo.c
b/drivers/gpu/drm/xe/display/intel_bo.c
index b463f5bd4eed1..bde276bc896b1 100644
--- a/drivers/gpu/drm/xe/display/intel_bo.c
+++ b/drivers/gpu/drm/xe/display/intel_bo.c
@@ -59,3 +59,13 @@ void intel_bo_describe(struct seq_file *m, struct
drm_gem_object *obj)
{
/* FIXME */
}
+
+void intel_bo_panic_map(struct drm_gem_object *obj, struct iosys_map *map)
+{
+ struct xe_bo *bo = gem_to_xe_bo(obj);
+ int ret;
+
+ ret = ttm_bo_vmap(&bo->ttm, map);
+ if (ret)
+ iosys_map_clear(map);
+}
--
2.47.1
