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drm/i915: add prefault_disable module option

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prefault is stll enabled by default which prevent most of pwrite/pread/reloc
from running slow path, in order to verify these slow pathes, prefault need
to be disabled.

Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
[danvet: Make checkpatch happy and bikeshed the module option help
text a bit.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Xiong Zhang 2013-07-19 13:51:24 +08:00 committed by Daniel Vetter
parent 6286ef9b56
commit 0b74b508f7
4 changed files with 17 additions and 7 deletions
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5
drivers/gpu/drm/i915/i915_drv.c
View File

@ -141,6 +141,11 @@ module_param_named(fastboot, i915_fastboot, bool, 0600);
MODULE_PARM_DESC(fastboot, "Try to skip unnecessary mode sets at boot time "
"(default: false)");
bool i915_prefault_disable __read_mostly;
module_param_named(prefault_disable, i915_prefault_disable, bool, 0600);
MODULE_PARM_DESC(prefault_disable,
"Disable page prefaulting for pread/pwrite/reloc (default:false). For developers only.");
static struct drm_driver driver;
extern int intel_agp_enabled;

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1627,6 +1627,7 @@ extern unsigned int i915_preliminary_hw_support __read_mostly;
extern int i915_disable_power_well __read_mostly;
extern int i915_enable_ips __read_mostly;
extern bool i915_fastboot __read_mostly;
extern bool i915_prefault_disable __read_mostly;
extern int i915_suspend(struct drm_device *dev, pm_message_t state);
extern int i915_resume(struct drm_device *dev);

12
drivers/gpu/drm/i915/i915_gem.c
View File

@ -465,7 +465,7 @@ i915_gem_shmem_pread(struct drm_device *dev,
mutex_unlock(&dev->struct_mutex);
if (!prefaulted) {
if (likely(!i915_prefault_disable) && !prefaulted) {
ret = fault_in_multipages_writeable(user_data, remain);
/* Userspace is tricking us, but we've already clobbered
* its pages with the prefault and promised to write the
@ -860,10 +860,12 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
args->size))
return -EFAULT;
ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
args->size);
if (ret)
return -EFAULT;
if (likely(!i915_prefault_disable)) {
ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
args->size);
if (ret)
return -EFAULT;
}
ret = i915_mutex_lock_interruptible(dev);
if (ret)

6
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -759,8 +759,10 @@ validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
if (!access_ok(VERIFY_WRITE, ptr, length))
return -EFAULT;
if (fault_in_multipages_readable(ptr, length))
return -EFAULT;
if (likely(!i915_prefault_disable)) {
if (fault_in_multipages_readable(ptr, length))
return -EFAULT;
}
}
return 0;