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drm/msm: add madvise ioctl

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Doesn't do anything too interesting until we wire up shrinker.  Pretty
much lifted from i915.

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark
2016-05-17 15:44:49 -04:00
parent b5b4c264df
commit 4cd33c48ea
5 changed files with 102 additions and 3 deletions
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25
include/uapi/drm/msm_drm.h
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@@ -201,6 +201,27 @@ struct drm_msm_wait_fence {
struct drm_msm_timespec timeout; /* in */
};
/* madvise provides a way to tell the kernel in case a buffers contents
* can be discarded under memory pressure, which is useful for userspace
* bo cache where we want to optimistically hold on to buffer allocate
* and potential mmap, but allow the pages to be discarded under memory
* pressure.
*
* Typical usage would involve madvise(DONTNEED) when buffer enters BO
* cache, and madvise(WILLNEED) if trying to recycle buffer from BO cache.
* In the WILLNEED case, 'retained' indicates to userspace whether the
* backing pages still exist.
*/
#define MSM_MADV_WILLNEED 0 /* backing pages are needed, status returned in 'retained' */
#define MSM_MADV_DONTNEED 1 /* backing pages not needed */
#define __MSM_MADV_PURGED 2 /* internal state */
struct drm_msm_gem_madvise {
__u32 handle; /* in, GEM handle */
__u32 madv; /* in, MSM_MADV_x */
__u32 retained; /* out, whether backing store still exists */
};
#define DRM_MSM_GET_PARAM 0x00
/* placeholder:
#define DRM_MSM_SET_PARAM 0x01
@@ -211,7 +232,8 @@ struct drm_msm_wait_fence {
#define DRM_MSM_GEM_CPU_FINI 0x05
#define DRM_MSM_GEM_SUBMIT 0x06
#define DRM_MSM_WAIT_FENCE 0x07
#define DRM_MSM_NUM_IOCTLS 0x08
#define DRM_MSM_GEM_MADVISE 0x08
#define DRM_MSM_NUM_IOCTLS 0x09
#define DRM_IOCTL_MSM_GET_PARAM DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GET_PARAM, struct drm_msm_param)
#define DRM_IOCTL_MSM_GEM_NEW DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GEM_NEW, struct drm_msm_gem_new)
@@ -220,6 +242,7 @@ struct drm_msm_wait_fence {
#define DRM_IOCTL_MSM_GEM_CPU_FINI DRM_IOW (DRM_COMMAND_BASE + DRM_MSM_GEM_CPU_FINI, struct drm_msm_gem_cpu_fini)
#define DRM_IOCTL_MSM_GEM_SUBMIT DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GEM_SUBMIT, struct drm_msm_gem_submit)
#define DRM_IOCTL_MSM_WAIT_FENCE DRM_IOW (DRM_COMMAND_BASE + DRM_MSM_WAIT_FENCE, struct drm_msm_wait_fence)
#define DRM_IOCTL_MSM_GEM_MADVISE DRM_IOWR(DRM_COMMAND_BASE + DRM_MSM_GEM_MADVISE, struct drm_msm_gem_madvise)
#if defined(__cplusplus)
}