drm/i915: l3 parity sysfs interface
Dumb binary interfaces which allow root-only updates of the cache remapping registers. As mentioned in a previous patch, software using this interface needs to know about HW limits, and other programming considerations as the kernel interface does no checking for these things on the root-only interface. v1: Drop extra posting reads (Chris) Return negative values in the sysfs interfaces on errors (Chris) v2: Return -EINVAL for offset % 4 (Jesse) Move schizo userspace check out (Jesse) Cleaner sysfs item initializers (Daniel) Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -29,6 +29,7 @@
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#include <linux/module.h>
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#include <linux/stat.h>
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#include <linux/sysfs.h>
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#include "intel_drv.h"
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#include "i915_drv.h"
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static u32 calc_residency(struct drm_device *dev, const u32 reg)
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@ -92,20 +93,136 @@ static struct attribute_group rc6_attr_group = {
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.attrs = rc6_attrs
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};
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static int l3_access_valid(struct drm_device *dev, loff_t offset)
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{
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if (!IS_IVYBRIDGE(dev))
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return -EPERM;
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if (offset % 4 != 0)
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return -EINVAL;
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if (offset >= GEN7_L3LOG_SIZE)
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return -ENXIO;
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return 0;
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}
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static ssize_t
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i915_l3_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf,
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loff_t offset, size_t count)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
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struct drm_device *drm_dev = dminor->dev;
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struct drm_i915_private *dev_priv = drm_dev->dev_private;
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uint32_t misccpctl;
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int i, ret;
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ret = l3_access_valid(drm_dev, offset);
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if (ret)
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return ret;
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ret = i915_mutex_lock_interruptible(drm_dev);
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if (ret)
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return ret;
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misccpctl = I915_READ(GEN7_MISCCPCTL);
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I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
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for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
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*((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);
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I915_WRITE(GEN7_MISCCPCTL, misccpctl);
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mutex_unlock(&drm_dev->struct_mutex);
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return i - offset;
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}
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static ssize_t
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i915_l3_write(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf,
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loff_t offset, size_t count)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
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struct drm_device *drm_dev = dminor->dev;
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struct drm_i915_private *dev_priv = drm_dev->dev_private;
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u32 *temp = NULL; /* Just here to make handling failures easy */
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int ret;
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ret = l3_access_valid(drm_dev, offset);
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if (ret)
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return ret;
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ret = i915_mutex_lock_interruptible(drm_dev);
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if (ret)
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return ret;
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if (!dev_priv->mm.l3_remap_info) {
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temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
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if (!temp) {
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mutex_unlock(&drm_dev->struct_mutex);
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return -ENOMEM;
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}
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}
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ret = i915_gpu_idle(drm_dev);
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if (ret) {
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kfree(temp);
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mutex_unlock(&drm_dev->struct_mutex);
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return ret;
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}
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/* TODO: Ideally we really want a GPU reset here to make sure errors
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* aren't propagated. Since I cannot find a stable way to reset the GPU
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* at this point it is left as a TODO.
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*/
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if (temp)
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dev_priv->mm.l3_remap_info = temp;
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memcpy(dev_priv->mm.l3_remap_info + (offset/4),
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buf + (offset/4),
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count);
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i915_gem_l3_remap(drm_dev);
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mutex_unlock(&drm_dev->struct_mutex);
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return count;
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}
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static struct bin_attribute dpf_attrs = {
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.attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
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.size = GEN7_L3LOG_SIZE,
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.read = i915_l3_read,
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.write = i915_l3_write,
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.mmap = NULL
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};
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void i915_setup_sysfs(struct drm_device *dev)
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{
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int ret;
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/* ILK doesn't have any residency information */
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/* ILK and below don't yet have relevant sysfs files */
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if (INTEL_INFO(dev)->gen < 6)
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return;
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ret = sysfs_merge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
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if (ret)
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DRM_ERROR("sysfs setup failed\n");
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DRM_ERROR("RC6 residency sysfs setup failed\n");
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if (!IS_IVYBRIDGE(dev))
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return;
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ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
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if (ret)
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DRM_ERROR("l3 parity sysfs setup failed\n");
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}
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void i915_teardown_sysfs(struct drm_device *dev)
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{
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device_remove_bin_file(&dev->primary->kdev, &dpf_attrs);
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sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
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}
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