drm/i915/gem: Pull phys pread/pwrite implementations to the backend

[linux-2.6-microblaze.git] / drivers / gpu / drm / i915 / gem / i915_gem_phys.c

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
index 28147aa..3a4dfe2 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
@@ -134,6 +134,58 @@ i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
                          vaddr, dma);
 }
 
+static int
+phys_pwrite(struct drm_i915_gem_object *obj,
+           const struct drm_i915_gem_pwrite *args)
+{
+       void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
+       char __user *user_data = u64_to_user_ptr(args->data_ptr);
+       int err;
+
+       err = i915_gem_object_wait(obj,
+                                  I915_WAIT_INTERRUPTIBLE |
+                                  I915_WAIT_ALL,
+                                  MAX_SCHEDULE_TIMEOUT);
+       if (err)
+               return err;
+
+       /*
+        * We manually control the domain here and pretend that it
+        * remains coherent i.e. in the GTT domain, like shmem_pwrite.
+        */
+       i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
+
+       if (copy_from_user(vaddr, user_data, args->size))
+               return -EFAULT;
+
+       drm_clflush_virt_range(vaddr, args->size);
+       intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt);
+
+       i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
+       return 0;
+}
+
+static int
+phys_pread(struct drm_i915_gem_object *obj,
+          const struct drm_i915_gem_pread *args)
+{
+       void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
+       char __user *user_data = u64_to_user_ptr(args->data_ptr);
+       int err;
+
+       err = i915_gem_object_wait(obj,
+                                  I915_WAIT_INTERRUPTIBLE,
+                                  MAX_SCHEDULE_TIMEOUT);
+       if (err)
+               return err;
+
+       drm_clflush_virt_range(vaddr, args->size);
+       if (copy_to_user(user_data, vaddr, args->size))
+               return -EFAULT;
+
+       return 0;
+}
+
 static void phys_release(struct drm_i915_gem_object *obj)
 {
        fput(obj->base.filp);
@@ -144,6 +196,9 @@ static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
        .get_pages = i915_gem_object_get_pages_phys,
        .put_pages = i915_gem_object_put_pages_phys,
 
+       .pread  = phys_pread,
+       .pwrite = phys_pwrite,
+
        .release = phys_release,
 };