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Commit 64f46f55 authored by Weinan Li's avatar Weinan Li Committed by Zhenyu Wang
Browse files

drm/i915/gvt: add interface to check if context is inhibit 



No functional change, just for easy to use.

v4:
- refine comment (Kevin)

Signed-off-by: default avatarWeinan Li <weinan.z.li@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent f9a651c0

drivers/gpu/drm/i915/gvt/mmio_context.c

+14 −10
Original line number Diff line number Diff line
@@ -295,6 +295,16 @@ static void switch_mocs(struct intel_vgpu *pre, struct intel_vgpu *next, 


#define CTX_CONTEXT_CONTROL_VAL	0x03



bool is_inhibit_context(struct i915_gem_context *ctx, int ring_id)

{

	u32 *reg_state = ctx->engine[ring_id].lrc_reg_state;

	u32 inhibit_mask =

		_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);



	return inhibit_mask ==

		(reg_state[CTX_CONTEXT_CONTROL_VAL] & inhibit_mask);

}



/* Switch ring mmio values (context). */

static void switch_mmio(struct intel_vgpu *pre,

			struct intel_vgpu *next,
@@ -302,9 +312,6 @@ static void switch_mmio(struct intel_vgpu *pre, 
{

	struct drm_i915_private *dev_priv;

	struct intel_vgpu_submission *s;

	u32 *reg_state, ctx_ctrl;

	u32 inhibit_mask =

		_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);

	struct engine_mmio *mmio;

	u32 old_v, new_v;
@@ -329,16 +336,13 @@ static void switch_mmio(struct intel_vgpu *pre, 
		// restore

		if (next) {

			s = &next->submission;

			reg_state =

				s->shadow_ctx->engine[ring_id].lrc_reg_state;

			ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL];

			/*

			 * if it is an inhibit context, load in_context mmio

			 * into HW by mmio write. If it is not, skip this mmio

			 * write.

			 * No need to restore the mmio which is in context state

			 * image if it's not inhibit context, it will restore

			 * itself.

			 */

			if (mmio->in_context &&

			    (ctx_ctrl & inhibit_mask) != inhibit_mask)

			    !is_inhibit_context(s->shadow_ctx, ring_id))

				continue;



			if (mmio->mask)

drivers/gpu/drm/i915/gvt/mmio_context.h

+2 −0
Original line number Diff line number Diff line
@@ -49,4 +49,6 @@ void intel_gvt_switch_mmio(struct intel_vgpu *pre, 


void intel_gvt_init_engine_mmio_context(struct intel_gvt *gvt);



bool is_inhibit_context(struct i915_gem_context *ctx, int ring_id);



#endif