drm/i915: setup io-mapping for LMEM

Create an io-mapping to describe the CPU aperture for lmem.

Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Matthew Auld <matthew.auld@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/20191025153728.23689-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_region_lmem.c b/drivers/gpu/drm/i915/intel_region_lmem.c
index 199532056e1bafbe551ae289a204a68c6fa050f7..9a351af45ce622f77498329f9fefc5bbd90a3517 100644 (file)
--- a/drivers/gpu/drm/i915/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/intel_region_lmem.c
@@ -9,8 +9,32 @@
 #include "gem/i915_gem_region.h"
 #include "intel_region_lmem.h"
 
+static void
+region_lmem_release(struct intel_memory_region *mem)
+{
+       io_mapping_fini(&mem->iomap);
+       intel_memory_region_release_buddy(mem);
+}
+
+static int
+region_lmem_init(struct intel_memory_region *mem)
+{
+       int ret;
+
+       if (!io_mapping_init_wc(&mem->iomap,
+                               mem->io_start,
+                               resource_size(&mem->region)))
+               return -EIO;
+
+       ret = intel_memory_region_init_buddy(mem);
+       if (ret)
+               io_mapping_fini(&mem->iomap);
+
+       return ret;
+}
+
 const struct intel_memory_region_ops intel_region_lmem_ops = {
-       .init = intel_memory_region_init_buddy,
-       .release = intel_memory_region_release_buddy,
+       .init = region_lmem_init,
+       .release = region_lmem_release,
        .create_object = __i915_gem_lmem_object_create,
 };