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drm/i915: l3 parity sysfs interface

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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>
This commit is contained in:
Ben Widawsky 2012-05-25 16:56:25 -07:00 committed by Daniel Vetter
parent b9524a1e1c
commit 84bc758124
1 changed files with 119 additions and 2 deletions
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121
drivers/gpu/drm/i915/i915_sysfs.c
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@ -29,6 +29,7 @@
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/sysfs.h>
#include "intel_drv.h"
#include "i915_drv.h"
static u32 calc_residency(struct drm_device *dev, const u32 reg)
@ -92,20 +93,136 @@ static struct attribute_group rc6_attr_group = {
.attrs = rc6_attrs
};
static int l3_access_valid(struct drm_device *dev, loff_t offset)
{
if (!IS_IVYBRIDGE(dev))
return -EPERM;
if (offset % 4 != 0)
return -EINVAL;
if (offset >= GEN7_L3LOG_SIZE)
return -ENXIO;
return 0;
}
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 = container_of(kobj, struct device, kobj);
struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
struct drm_device *drm_dev = dminor->dev;
struct drm_i915_private *dev_priv = drm_dev->dev_private;
uint32_t misccpctl;
int i, ret;
ret = l3_access_valid(drm_dev, offset);
if (ret)
return ret;
ret = i915_mutex_lock_interruptible(drm_dev);
if (ret)
return ret;
misccpctl = I915_READ(GEN7_MISCCPCTL);
I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
*((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);
I915_WRITE(GEN7_MISCCPCTL, misccpctl);
mutex_unlock(&drm_dev->struct_mutex);
return i - offset;
}
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 = container_of(kobj, struct device, kobj);
struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
struct drm_device *drm_dev = dminor->dev;
struct drm_i915_private *dev_priv = drm_dev->dev_private;
u32 *temp = NULL; /* Just here to make handling failures easy */
int ret;
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->mm.l3_remap_info) {
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->mm.l3_remap_info = temp;
memcpy(dev_priv->mm.l3_remap_info + (offset/4),
buf + (offset/4),
count);
i915_gem_l3_remap(drm_dev);
mutex_unlock(&drm_dev->struct_mutex);
return count;
}
static struct bin_attribute dpf_attrs = {
.attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
.size = GEN7_L3LOG_SIZE,
.read = i915_l3_read,
.write = i915_l3_write,
.mmap = NULL
};
void i915_setup_sysfs(struct drm_device *dev)
{
int ret;
/* ILK doesn't have any residency information */
/* ILK and below don't yet have relevant sysfs files */
if (INTEL_INFO(dev)->gen < 6)
return;
ret = sysfs_merge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
if (ret)
DRM_ERROR("sysfs setup failed\n");
DRM_ERROR("RC6 residency sysfs setup failed\n");
if (!IS_IVYBRIDGE(dev))
return;
ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
if (ret)
DRM_ERROR("l3 parity sysfs setup failed\n");
}
void i915_teardown_sysfs(struct drm_device *dev)
{
device_remove_bin_file(&dev->primary->kdev, &dpf_attrs);
sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
}