On Sun, Mar 18, 2012 at 01:39:56PM -0700, Ben Widawsky wrote:
> Ironlake RC6 needs to allocate a power context object which the hardware
> can automatically switch to. Since the new context code nicely handles
> contexts, create some interfaces so we can hook up the existing code to
> the new code.
>
> The right way to do this is to move a bunch of code out of
> intel_display.c but I don't feel like doing it at this time. This patch
> is a step in the right direction though.
>
> CC: Jesse Barnes <jbar...@virtuousgeek.org>
> Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
I've looked through this and assuming I understand things correctly, this
is just to replace the power context on ilk. For the render context stuff
I expect that we can just directly re-use the default context.
Adding up the diffs I don't think the added indirection of these anonymous
contexts over simply using a plain gem object for the powercontext is
worth it. So I suggest we just rip this out.
-Daniel
> ---
> drivers/gpu/drm/i915/i915_drv.h | 3 +++
> drivers/gpu/drm/i915/i915_gem_context.c | 40
> +++++++++++++++++++++++++++++--
> 2 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index d49615e..003b62e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -280,6 +280,7 @@ struct i915_hw_ppgtt {
>
> /* This must match up with the value previously used for execbuf2.rsvd1. */
> #define DEFAULT_CONTEXT_ID 0
> +#define ANONYMOUS_CONTEXT_ID 1
> struct i915_hw_context {
> struct drm_i915_file_private *file_priv;
> struct kref nref;
> @@ -1316,6 +1317,8 @@ 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,
> struct drm_file *file);
> +struct i915_hw_context *i915_context_alloc_anonymous(struct drm_device *dev);
> +void i915_context_destroy_anonymous(struct i915_hw_context *ctx);
>
> /* i915_gem_gtt.c */
> int __must_check i915_gem_init_aliasing_ppgtt(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
> b/drivers/gpu/drm/i915/i915_gem_context.c
> index accb3de..de1f3ce 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -122,7 +122,7 @@ again:
>
> spin_lock(&file_priv->context_lock);
> ret = idr_get_new_above(&file_priv->context_idr, *ctx_out,
> - DEFAULT_CONTEXT_ID + 1, &id);
> + ANONYMOUS_CONTEXT_ID + 1, &id);
> if (ret == 0)
> (*ctx_out)->id = id;
> spin_unlock(&file_priv->context_lock);
> @@ -254,7 +254,7 @@ static int context_idr_cleanup(int id, void *p, void
> *data)
> struct drm_i915_file_private *file_priv = file->driver_priv;
> struct i915_hw_context *ctx;
>
> - BUG_ON(id == DEFAULT_CONTEXT_ID);
> + BUG_ON(id == DEFAULT_CONTEXT_ID || id == ANONYMOUS_CONTEXT_ID);
> ctx = i915_gem_context_get(file_priv, id);
> BUG_ON(ctx == NULL);
> kref_put(&ctx->nref, destroy_hw_context);
> @@ -380,6 +380,8 @@ int i915_switch_context(struct intel_ring_buffer *ring,
> if (ring != &dev_priv->ring[RCS])
> return 0;
>
> + BUG_ON(to_id == ANONYMOUS_CONTEXT_ID);
> +
> if (file)
> file_priv = file->driver_priv;
>
> @@ -475,3 +477,37 @@ int i915_gem_context_destroy_ioctl(struct drm_device
> *dev, void *data,
> DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id);
> return 0;
> }
> +
> +struct i915_hw_context *
> +i915_context_alloc_anonymous(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct i915_hw_context *ctx;
> + int ret;
> +
> + if (dev_priv->hw_contexts_disabled)
> + return NULL;
> +
> + ret = create_hw_context(dev, NULL, &ctx);
> + if (ret)
> + return NULL;
> +
> + ctx->id = ANONYMOUS_CONTEXT_ID;
> + ctx->obj->context_id = ANONYMOUS_CONTEXT_ID;
> +
> + /* Anonymous contexts are assumed to be always pinned */
> + ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false);
> + if (ret)
> + do_destroy(ctx);
> +
> + return ctx;
> +}
> +
> +void i915_context_destroy_anonymous(struct i915_hw_context *ctx)
> +{
> + BUG_ON(ctx->id != ANONYMOUS_CONTEXT_ID);
> + BUG_ON(ctx->obj->context_id != ANONYMOUS_CONTEXT_ID);
> +
> + i915_gem_object_unpin(ctx->obj);
> + kref_put(&ctx->nref, destroy_hw_context);
> +}
> --
> 1.7.9.4
>
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--
Daniel Vetter
Mail: dan...@ffwll.ch
Mobile: +41 (0)79 365 57 48
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