drm/i915/lmem: debugfs for LMEM details

Debugfs i915_gem_object is extended to enable the IGTs to
detect the LMEM's availability and the total size of LMEM.

v2: READ_ONCE is used [Chris]
v3: %pa is used for printing the resource [Chris]
v4: All regions' details added to debugfs [Chris]
v5: Macro for_each_mem_region added
    name is initialized at region init [Chris]

Signed-off-by: Lukasz Fiedorowicz <lukasz.fiedorowicz@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191227133748.4330-1-ramalingam.c@intel.com

drivers/gpu/drm/i915/gem/i915_gem_shmem.c

@@ -594,6 +594,8 @@ static int init_shmem(struct intel_memory_region *mem)
 			 err);
 	}
 
+	intel_memory_region_set_name(mem, "system");
+
 	return 0; /* Don't error, we can simply fallback to the kernel mnt */
 }
 

drivers/gpu/drm/i915/gem/i915_gem_stolen.c

@@ -645,6 +645,8 @@ i915_gem_object_create_stolen(struct drm_i915_private *i915,
 
 static int init_stolen(struct intel_memory_region *mem)
 {
+	intel_memory_region_set_name(mem, "stolen");
+
 	/*
 	 * Initialise stolen early so that we may reserve preallocated
 	 * objects for the BIOS to KMS transition.

drivers/gpu/drm/i915/i915_debugfs.c

@@ -367,12 +367,16 @@ static void print_context_stats(struct seq_file *m,
 static int i915_gem_object_info(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *i915 = node_to_i915(m->private);
+	struct intel_memory_region *mr;
+	enum intel_region_id id;
 
 	seq_printf(m, "%u shrinkable [%u free] objects, %llu bytes\n",
 		   i915->mm.shrink_count,
 		   atomic_read(&i915->mm.free_count),
 		   i915->mm.shrink_memory);
-
+	for_each_memory_region(mr, i915, id)
+		seq_printf(m, "%s: total:%pa, available:%pa bytes\n",
+			   mr->name, &mr->total, &mr->avail);
 	seq_putc(m, '\n');
 
 	print_context_stats(m, i915);

drivers/gpu/drm/i915/intel_memory_region.c

@@ -37,7 +37,7 @@ __intel_memory_region_put_pages_buddy(struct intel_memory_region *mem,
 				      struct list_head *blocks)
 {
 	mutex_lock(&mem->mm_lock);
-	intel_memory_region_free_pages(mem, blocks);
+	mem->avail += intel_memory_region_free_pages(mem, blocks);
 	mutex_unlock(&mem->mm_lock);
 }
 
@@ -106,6 +106,7 @@ __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
 			break;
 	} while (1);
 
+	mem->avail -= size;
 	mutex_unlock(&mem->mm_lock);
 	return 0;
 
@@ -164,6 +165,8 @@ intel_memory_region_create(struct drm_i915_private *i915,
 	mem->io_start = io_start;
 	mem->min_page_size = min_page_size;
 	mem->ops = ops;
+	mem->total = size;
+	mem->avail = mem->total;
 
 	mutex_init(&mem->objects.lock);
 	INIT_LIST_HEAD(&mem->objects.list);
@@ -185,6 +188,16 @@ intel_memory_region_create(struct drm_i915_private *i915,
 	return ERR_PTR(err);
 }
 
+void intel_memory_region_set_name(struct intel_memory_region *mem,
+				  const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(mem->name, sizeof(mem->name), fmt, ap);
+	va_end(ap);
+}
+
 static void __intel_memory_region_destroy(struct kref *kref)
 {
 	struct intel_memory_region *mem =

drivers/gpu/drm/i915/intel_memory_region.h

@@ -47,6 +47,10 @@ enum intel_region_id {
 #define I915_ALLOC_MIN_PAGE_SIZE  BIT(0)
 #define I915_ALLOC_CONTIGUOUS     BIT(1)
 
+#define for_each_memory_region(mr, i915, id) \
+	for (id = 0; id < ARRAY_SIZE((i915)->mm.regions); id++) \
+		for_each_if((mr) = (i915)->mm.regions[id])
+
 /**
  * Memory regions encoded as type | instance
  */
@@ -82,10 +86,13 @@ struct intel_memory_region {
 
 	resource_size_t io_start;
 	resource_size_t min_page_size;
+	resource_size_t total;
+	resource_size_t avail;
 
 	unsigned int type;
 	unsigned int instance;
 	unsigned int id;
+	char name[8];
 
 	dma_addr_t remap_addr;
 
@@ -126,4 +133,8 @@ void intel_memory_region_put(struct intel_memory_region *mem);
 int intel_memory_regions_hw_probe(struct drm_i915_private *i915);
 void intel_memory_regions_driver_release(struct drm_i915_private *i915);
 
+__printf(2, 3) void
+intel_memory_region_set_name(struct intel_memory_region *mem,
+			     const char *fmt, ...);
+
 #endif

drivers/gpu/drm/i915/intel_region_lmem.c

@@ -90,6 +90,8 @@ region_lmem_init(struct intel_memory_region *mem)
 	if (ret)
 		io_mapping_fini(&mem->iomap);
 
+	intel_memory_region_set_name(mem, "local");
+
 	return ret;
 }