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Commit 4cd33c48 authored by Rob Clark's avatar Rob Clark
Browse files

drm/msm: add madvise ioctl 



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

Signed-off-by: default avatarRob Clark <robdclark@gmail.com>
parent b5b4c264

drivers/gpu/drm/msm/msm_drv.c

+39 −0
Original line number Diff line number Diff line
@@ -690,6 +690,44 @@ static int msm_ioctl_wait_fence(struct drm_device *dev, void *data, 
	return msm_wait_fence(priv->gpu->fctx, args->fence, &timeout, true);

}



static int msm_ioctl_gem_madvise(struct drm_device *dev, void *data,

		struct drm_file *file)

{

	struct drm_msm_gem_madvise *args = data;

	struct drm_gem_object *obj;

	int ret;



	switch (args->madv) {

	case MSM_MADV_DONTNEED:

	case MSM_MADV_WILLNEED:

		break;

	default:

		return -EINVAL;

	}



	ret = mutex_lock_interruptible(&dev->struct_mutex);

	if (ret)

		return ret;



	obj = drm_gem_object_lookup(file, args->handle);

	if (!obj) {

		ret = -ENOENT;

		goto unlock;

	}



	ret = msm_gem_madvise(obj, args->madv);

	if (ret >= 0) {

		args->retained = ret;

		ret = 0;

	}



	drm_gem_object_unreference(obj);



unlock:

	mutex_unlock(&dev->struct_mutex);

	return ret;

}



static const struct drm_ioctl_desc msm_ioctls[] = {

	DRM_IOCTL_DEF_DRV(MSM_GET_PARAM,    msm_ioctl_get_param,    DRM_AUTH|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF_DRV(MSM_GEM_NEW,      msm_ioctl_gem_new,      DRM_AUTH|DRM_RENDER_ALLOW),
@@ -698,6 +736,7 @@ static const struct drm_ioctl_desc msm_ioctls[] = { 
	DRM_IOCTL_DEF_DRV(MSM_GEM_CPU_FINI, msm_ioctl_gem_cpu_fini, DRM_AUTH|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF_DRV(MSM_GEM_SUBMIT,   msm_ioctl_gem_submit,   DRM_AUTH|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF_DRV(MSM_WAIT_FENCE,   msm_ioctl_wait_fence,   DRM_AUTH|DRM_RENDER_ALLOW),

	DRM_IOCTL_DEF_DRV(MSM_GEM_MADVISE,  msm_ioctl_gem_madvise,  DRM_AUTH|DRM_RENDER_ALLOW),

};



static const struct vm_operations_struct vm_ops = {

drivers/gpu/drm/msm/msm_drv.h

+1 −0
Original line number Diff line number Diff line
@@ -195,6 +195,7 @@ int msm_gem_prime_pin(struct drm_gem_object *obj); 
void msm_gem_prime_unpin(struct drm_gem_object *obj);

void *msm_gem_vaddr_locked(struct drm_gem_object *obj);

void *msm_gem_vaddr(struct drm_gem_object *obj);

int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv);

int msm_gem_sync_object(struct drm_gem_object *obj,

		struct msm_fence_context *fctx, bool exclusive);

void msm_gem_move_to_active(struct drm_gem_object *obj,

drivers/gpu/drm/msm/msm_gem.c

+33 −2
Original line number Diff line number Diff line
@@ -413,6 +413,21 @@ void *msm_gem_vaddr(struct drm_gem_object *obj) 
	return ret;

}



/* Update madvise status, returns true if not purged, else

 * false or -errno.

 */

int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);



	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));



	if (msm_obj->madv != __MSM_MADV_PURGED)

		msm_obj->madv = madv;



	return (msm_obj->madv != __MSM_MADV_PURGED);

}



/* must be called before _move_to_active().. */

int msm_gem_sync_object(struct drm_gem_object *obj,

		struct msm_fence_context *fctx, bool exclusive)
@@ -464,6 +479,7 @@ void msm_gem_move_to_active(struct drm_gem_object *obj, 
		struct msm_gpu *gpu, bool exclusive, struct fence *fence)

{

	struct msm_gem_object *msm_obj = to_msm_bo(obj);

	WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED);

	msm_obj->gpu = gpu;

	if (exclusive)

		reservation_object_add_excl_fence(msm_obj->resv, fence);
@@ -532,13 +548,27 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 
	struct reservation_object_list *fobj;

	struct fence *fence;

	uint64_t off = drm_vma_node_start(&obj->vma_node);

	const char *madv;



	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));



	seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu\n",

	switch (msm_obj->madv) {

	case __MSM_MADV_PURGED:

		madv = " purged";

		break;

	case MSM_MADV_DONTNEED:

		madv = " purgeable";

		break;

	case MSM_MADV_WILLNEED:

	default:

		madv = "";

		break;

	}



	seq_printf(m, "%08x: %c %2d (%2d) %08llx %p %zu%s\n",

			msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',

			obj->name, obj->refcount.refcount.counter,

			off, msm_obj->vaddr, obj->size);

			off, msm_obj->vaddr, obj->size, madv);



	rcu_read_lock();

	fobj = rcu_dereference(robj->fence);
@@ -688,6 +718,7 @@ static int msm_gem_new_impl(struct drm_device *dev, 
		msm_obj->vram_node = (void *)&msm_obj[1];



	msm_obj->flags = flags;

	msm_obj->madv = MSM_MADV_WILLNEED;



	if (resv) {

		msm_obj->resv = resv;

drivers/gpu/drm/msm/msm_gem.h

+5 −0
Original line number Diff line number Diff line
@@ -29,6 +29,11 @@ struct msm_gem_object { 


	uint32_t flags;



	/**

	 * Advice: are the backing pages purgeable?

	 */

	uint8_t madv;



	/* And object is either:

	 *  inactive - on priv->inactive_list

	 *  active   - on one one of the gpu's active_list..  well, at

include/uapi/drm/msm_drm.h

+24 −1
Original line number Diff line number Diff line
@@ -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)

}