static ssize_t
i915_l3_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t offset, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct drm_minor *dminor = dev_to_drm_minor(dev);
struct drm_device *drm_dev = dminor->dev;
struct drm_i915_private *dev_priv = drm_dev->dev_private;
int slice = (int)(uintptr_t)attr->private;
int ret;
count = round_down(count, 4);
ret = l3_access_valid(drm_dev, offset);
if (ret)
return ret;
count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
ret = i915_mutex_lock_interruptible(drm_dev);
if (ret)
return ret;
if (dev_priv->l3_parity.remap_info[slice])
memcpy(buf,
dev_priv->l3_parity.remap_info[slice] + (offset/4),
count);
else
memset(buf, 0, count);
mutex_unlock(&drm_dev->struct_mutex);
return count;
}
static ssize_t
i915_l3_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t offset, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct drm_minor *dminor = dev_to_drm_minor(dev);
struct drm_device *drm_dev = dminor->dev;
struct drm_i915_private *dev_priv = drm_dev->dev_private;
struct intel_context *ctx;
u32 *temp = NULL; /* Just here to make handling failures easy */
int slice = (int)(uintptr_t)attr->private;
int ret;
if (!HAS_HW_CONTEXTS(drm_dev))
return -ENXIO;
ret = l3_access_valid(drm_dev, offset);
if (ret)
return ret;
ret = i915_mutex_lock_interruptible(drm_dev);
if (ret)
return ret;
if (!dev_priv->l3_parity.remap_info[slice]) {
temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
if (!temp) {
mutex_unlock(&drm_dev->struct_mutex);
return -ENOMEM;
}
}
ret = i915_gpu_idle(drm_dev);
if (ret) {
kfree(temp);
mutex_unlock(&drm_dev->struct_mutex);
return ret;
}
/* TODO: Ideally we really want a GPU reset here to make sure errors
* aren't propagated. Since I cannot find a stable way to reset the GPU
* at this point it is left as a TODO.
*/
if (temp)
dev_priv->l3_parity.remap_info[slice] = temp;
memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
/* NB: We defer the remapping until we switch to the context */
list_for_each_entry(ctx, &dev_priv->context_list, link)
ctx->remap_slice |= (1<<slice);
mutex_unlock(&drm_dev->struct_mutex);
return count;
}
static ssize_t
i915_l3_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t offset, size_t count)
{
struct device *kdev = kobj_to_dev(kobj);
struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
struct drm_device *dev = &dev_priv->drm;
struct i915_gem_context *ctx;
int slice = (int)(uintptr_t)attr->private;
u32 **remap_info;
int ret;
ret = l3_access_valid(dev_priv, offset);
if (ret)
return ret;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ret;
remap_info = &dev_priv->l3_parity.remap_info[slice];
if (!*remap_info) {
*remap_info = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
if (!*remap_info) {
ret = -ENOMEM;
goto out;
}
}
/* TODO: Ideally we really want a GPU reset here to make sure errors
* aren't propagated. Since I cannot find a stable way to reset the GPU
* at this point it is left as a TODO.
*/
memcpy(*remap_info + (offset/4), buf, count);
/* NB: We defer the remapping until we switch to the context */
list_for_each_entry(ctx, &dev_priv->context_list, link)
ctx->remap_slice |= (1<<slice);
ret = count;
out:
mutex_unlock(&dev->struct_mutex);
return ret;
}