static int guc_log_map(struct intel_guc_log *log)
{
struct intel_guc *guc = log_to_guc(log);
struct drm_i915_private *dev_priv = guc_to_i915(guc);
void *vaddr;
int ret;
lockdep_assert_held(&log->relay.lock);
if (!log->vma)
return -ENODEV;
mutex_lock(&dev_priv->drm.struct_mutex);
ret = i915_gem_object_set_to_wc_domain(log->vma->obj, true);
mutex_unlock(&dev_priv->drm.struct_mutex);
if (ret)
return ret;
/*
* Create a WC (Uncached for read) vmalloc mapping of log
* buffer pages, so that we can directly get the data
* (up-to-date) from memory.
*/
vaddr = i915_gem_object_pin_map(log->vma->obj, I915_MAP_WC);
if (IS_ERR(vaddr)) {
DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
return PTR_ERR(vaddr);
}
log->relay.buf_addr = vaddr;
return 0;
}
static int wc_get(struct drm_i915_gem_object *obj,
unsigned long offset,
u32 *v)
{
u32 *map;
int err;
err = i915_gem_object_set_to_wc_domain(obj, false);
if (err)
return err;
map = i915_gem_object_pin_map(obj, I915_MAP_WC);
if (IS_ERR(map))
return PTR_ERR(map);
*v = map[offset / sizeof(*map)];
i915_gem_object_unpin_map(obj);
return 0;
}
