[Intel-gfx] [PATCH 28/38] drm/i915: Create/destroy VM (ppGTT) for use with contexts

Tvrtko Ursulin tvrtko.ursulin at linux.intel.com
Wed Jan 23 11:30:39 UTC 2019


On 18/01/2019 14:00, Chris Wilson wrote:
> In preparation to making the ppGTT binding for a context explicit (to
> facilitate reusing the same ppGTT between different contexts), allow the
> user to create and destroy named ppGTT.

Needs some more text to explain uAPI usage, or even better kerneldoc in 
i915_drm.h.

> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>   drivers/gpu/drm/i915/i915_drv.c         |  2 +
>   drivers/gpu/drm/i915/i915_drv.h         |  3 +
>   drivers/gpu/drm/i915/i915_gem_context.c | 83 +++++++++++++++++++++++++
>   drivers/gpu/drm/i915/i915_gem_context.h |  5 ++
>   drivers/gpu/drm/i915/i915_gem_gtt.h     |  2 +
>   include/uapi/drm/i915_drm.h             | 10 +++
>   6 files changed, 105 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index f462a4d28af4..56bd087f1c4e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -3003,6 +3003,8 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
>   	DRM_IOCTL_DEF_DRV(I915_PERF_ADD_CONFIG, i915_perf_add_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
>   	DRM_IOCTL_DEF_DRV(I915_PERF_REMOVE_CONFIG, i915_perf_remove_config_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
>   	DRM_IOCTL_DEF_DRV(I915_QUERY, i915_query_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
> +	DRM_IOCTL_DEF_DRV(I915_GEM_VM_CREATE, i915_gem_vm_create_ioctl, DRM_RENDER_ALLOW),
> +	DRM_IOCTL_DEF_DRV(I915_GEM_VM_DESTROY, i915_gem_vm_destroy_ioctl, DRM_RENDER_ALLOW),
>   };
>   
>   static struct drm_driver driver = {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 74bccb153359..cb11c23823c7 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -217,6 +217,9 @@ struct drm_i915_file_private {
>   	} mm;
>   	struct idr context_idr;
>   
> +	struct mutex vm_lock;
> +	struct idr vm_idr;
> +
>   	struct intel_rps_client {
>   		atomic_t boosts;
>   	} rps_client;
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index e8334c4bc130..7c90981704bf 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -598,19 +598,29 @@ static int context_idr_cleanup(int id, void *p, void *data)
>   	return 0;
>   }
>   
> +static int vm_idr_cleanup(int id, void *p, void *data)
> +{
> +	i915_ppgtt_put(p);
> +	return 0;
> +}
> +
>   int i915_gem_context_open(struct drm_i915_private *i915,
>   			  struct drm_file *file)
>   {
>   	struct drm_i915_file_private *file_priv = file->driver_priv;
>   	struct i915_gem_context *ctx;
>   
> +	mutex_init(&file_priv->vm_lock);
> +
>   	idr_init(&file_priv->context_idr);
> +	idr_init_base(&file_priv->vm_idr, 1);
>   
>   	mutex_lock(&i915->drm.struct_mutex);
>   	ctx = i915_gem_create_context(i915, file_priv);
>   	mutex_unlock(&i915->drm.struct_mutex);
>   	if (IS_ERR(ctx)) {
>   		idr_destroy(&file_priv->context_idr);
> +		idr_destroy(&file_priv->vm_idr);
>   		return PTR_ERR(ctx);
>   	}
>   
> @@ -627,6 +637,79 @@ void i915_gem_context_close(struct drm_file *file)
>   
>   	idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL);
>   	idr_destroy(&file_priv->context_idr);
> +
> +	idr_for_each(&file_priv->vm_idr, vm_idr_cleanup, NULL);
> +	idr_destroy(&file_priv->vm_idr);
> +
> +	mutex_destroy(&file_priv->vm_lock);
> +}
> +
> +int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
> +			     struct drm_file *file)
> +{
> +	struct drm_i915_private *i915 = to_i915(dev);
> +	struct drm_i915_gem_vm_create *args = data;
> +	struct drm_i915_file_private *file_priv = file->driver_priv;
> +	struct i915_hw_ppgtt *ppgtt;
> +	int err;
> +
> +	if (!HAS_FULL_PPGTT(i915))
> +		return -ENODEV;
> +
> +	if (args->flags)
> +		return -EINVAL;
> +
> +	if (args->extensions)
> +		return -EINVAL;
> +
> +	ppgtt = i915_ppgtt_create(i915, file_priv);
> +	if (IS_ERR(ppgtt))
> +		return PTR_ERR(ppgtt);
> +
> +	err = mutex_lock_interruptible(&file_priv->vm_lock);
> +	if (err)
> +		goto err_put;
> +
> +	err = idr_alloc(&file_priv->vm_idr, ppgtt, 0, 0, GFP_KERNEL);
> +	mutex_unlock(&file_priv->vm_lock);
> +	if (err < 0)
> +		goto err_put;

	else if (GEM_WARN_ON(err == 0) {
		err = -EINVAL;
		goto err_put;
	}

?

Or a GEM_BUG_ON(err == 0) if you must. :)

> +
> +	ppgtt->user_handle = err;
> +	args->id = err;
> +	return 0;
> +
> +err_put:
> +	i915_ppgtt_put(ppgtt);
> +	return err;
> +}
> +
> +int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,

Can we cheat and declare data as u32 * here and so avoid need for the 
local, since there are only two dereferences?

> +			      struct drm_file *file)
> +{
> +	struct drm_i915_file_private *file_priv = file->driver_priv;
> +	struct i915_hw_ppgtt *ppgtt;
> +	int err;
> +	u32 id;
> +
> +	id = *(u32 *)data;
> +	if (!id)
> +		return -ENOENT;
> +
> +	err = mutex_lock_interruptible(&file_priv->vm_lock);
> +	if (err)
> +		return err;
> +
> +	ppgtt = idr_remove(&file_priv->vm_idr, id);
> +	if (ppgtt)

GEM_WARN_ON(id != ppgtt->user_handle) too much paranoia?

> +		ppgtt->user_handle = 0;
> +
> +	mutex_unlock(&file_priv->vm_lock);
> +	if (!ppgtt)
> +		return -ENOENT;
> +
> +	i915_ppgtt_put(ppgtt);
> +	return 0;

Or end with simply:

i915_ppgtt_put(ppgtt);

return ppgtt ? 0 : -ENOENT;

?

>   }
>   
>   static struct i915_request *
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h
> index 1e41a97b8007..9786f86b659d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.h
> +++ b/drivers/gpu/drm/i915/i915_gem_context.h
> @@ -348,6 +348,11 @@ void i915_gem_context_release(struct kref *ctx_ref);
>   struct i915_gem_context *
>   i915_gem_context_create_gvt(struct drm_device *dev);
>   
> +int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
> +			     struct drm_file *file);
> +int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,
> +			      struct drm_file *file);
> +
>   int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
>   				  struct drm_file *file);
>   int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> index 03ade71b8d9a..61698609a62c 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> @@ -396,6 +396,8 @@ struct i915_hw_ppgtt {
>   		struct i915_page_directory_pointer pdp;	/* GEN8+ */
>   		struct i915_page_directory pd;		/* GEN6-7 */
>   	};
> +
> +	u32 user_handle;
>   };
>   
>   struct gen6_hw_ppgtt {
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 6ee2221838da..c3336c931a95 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -339,6 +339,8 @@ typedef struct _drm_i915_sarea {
>   #define DRM_I915_PERF_ADD_CONFIG	0x37
>   #define DRM_I915_PERF_REMOVE_CONFIG	0x38
>   #define DRM_I915_QUERY			0x39
> +#define DRM_I915_GEM_VM_CREATE		0x3a
> +#define DRM_I915_GEM_VM_DESTROY		0x3b
>   
>   #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
>   #define DRM_IOCTL_I915_FLUSH		DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
> @@ -397,6 +399,8 @@ typedef struct _drm_i915_sarea {
>   #define DRM_IOCTL_I915_PERF_ADD_CONFIG	DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_ADD_CONFIG, struct drm_i915_perf_oa_config)
>   #define DRM_IOCTL_I915_PERF_REMOVE_CONFIG	DRM_IOW(DRM_COMMAND_BASE + DRM_I915_PERF_REMOVE_CONFIG, __u64)
>   #define DRM_IOCTL_I915_QUERY			DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_QUERY, struct drm_i915_query)
> +#define DRM_IOCTL_I915_GEM_VM_CREATE	DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_VM_CREATE, struct drm_i915_gem_vm_create)
> +#define DRM_IOCTL_I915_GEM_VM_DESTROY	DRM_IOW (DRM_COMMAND_BASE + DRM_I915_GEM_VM_DESTROY, uint32_t)
>   
>   /* Allow drivers to submit batchbuffers directly to hardware, relying
>    * on the security mechanisms provided by hardware.
> @@ -1442,6 +1446,12 @@ struct drm_i915_gem_context_destroy {
>   	__u32 pad;
>   };

Some kernel doc overview of create and destroy usage, especially since 
destroy does not have it's own data structure.

> +struct drm_i915_gem_vm_create {
> +	__u64 extensions;
> +	__u32 flags;
> +	__u32 id; /* output: id of new vm */
> +};
> +
>   struct drm_i915_reg_read {
>   	/*
>   	 * Register offset.
> 

Regards,

Tvrtko


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