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/*
* Copyright © 2014-2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include "intel_guc_ads.h"
#include "intel_uc.h"
#include "i915_drv.h"
/*
* The Additional Data Struct (ADS) has pointers for different buffers used by
* the GuC. One single gem object contains the ADS struct itself (guc_ads), the
* scheduling policies (guc_policies), a structure describing a collection of
* register sets (guc_mmio_reg_state) and some extra pages for the GuC to save
* its internal state for sleep.
*/
static void guc_policy_init(struct guc_policy *policy)
{
policy->execution_quantum = POLICY_DEFAULT_EXECUTION_QUANTUM_US;
policy->preemption_time = POLICY_DEFAULT_PREEMPTION_TIME_US;
policy->fault_time = POLICY_DEFAULT_FAULT_TIME_US;
policy->policy_flags = 0;
}
static void guc_policies_init(struct guc_policies *policies)
{
struct guc_policy *policy;
u32 p, i;
policies->dpc_promote_time = POLICY_DEFAULT_DPC_PROMOTE_TIME_US;
policies->max_num_work_items = POLICY_MAX_NUM_WI;
for (p = 0; p < GUC_CLIENT_PRIORITY_NUM; p++) {
for (i = GUC_RENDER_ENGINE; i < GUC_MAX_ENGINES_NUM; i++) {
policy = &policies->policy[p][i];
guc_policy_init(policy);
}
}
policies->is_valid = 1;
}
/*
* The first 80 dwords of the register state context, containing the
* execlists and ppgtt registers.
*/
#define LR_HW_CONTEXT_SIZE (80 * sizeof(u32))
/**
* intel_guc_ads_create() - creates GuC ADS
* @guc: intel_guc struct
*
*/
int intel_guc_ads_create(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
struct i915_vma *vma, *kernel_ctx_vma;
struct page *page;
/* The ads obj includes the struct itself and buffers passed to GuC */
struct {
struct guc_ads ads;
struct guc_policies policies;
struct guc_mmio_reg_state reg_state;
u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
} __packed *blob;
struct intel_engine_cs *engine;
enum intel_engine_id id;
const u32 skipped_offset = LRC_HEADER_PAGES * PAGE_SIZE;
const u32 skipped_size = LRC_PPHWSP_SZ * PAGE_SIZE + LR_HW_CONTEXT_SIZE;
u32 base;
GEM_BUG_ON(guc->ads_vma);
vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(sizeof(*blob)));
if (IS_ERR(vma))
return PTR_ERR(vma);
guc->ads_vma = vma;
page = i915_vma_first_page(vma);
blob = kmap(page);
/* GuC scheduling policies */
guc_policies_init(&blob->policies);
/* MMIO reg state */
for_each_engine(engine, dev_priv, id) {
blob->reg_state.white_list[engine->guc_id].mmio_start =
engine->mmio_base + GUC_MMIO_WHITE_LIST_START;
/* Nothing to be saved or restored for now. */
blob->reg_state.white_list[engine->guc_id].count = 0;
}
/*
* The GuC requires a "Golden Context" when it reinitialises
* engines after a reset. Here we use the Render ring default
* context, which must already exist and be pinned in the GGTT,
* so its address won't change after we've told the GuC where
* to find it. Note that we have to skip our header (1 page),
* because our GuC shared data is there.
*/
kernel_ctx_vma = to_intel_context(dev_priv->kernel_context,
dev_priv->engine[RCS])->state;
blob->ads.golden_context_lrca =
intel_guc_ggtt_offset(guc, kernel_ctx_vma) + skipped_offset;
/*
* The GuC expects us to exclude the portion of the context image that
* it skips from the size it is to read. It starts reading from after
* the execlist context (so skipping the first page [PPHWSP] and 80
* dwords). Weird guc is weird.
*/
for_each_engine(engine, dev_priv, id)
blob->ads.eng_state_size[engine->guc_id] =
engine->context_size - skipped_size;
base = intel_guc_ggtt_offset(guc, vma);
blob->ads.scheduler_policies = base + ptr_offset(blob, policies);
blob->ads.reg_state_buffer = base + ptr_offset(blob, reg_state_buffer);
blob->ads.reg_state_addr = base + ptr_offset(blob, reg_state);
kunmap(page);
return 0;
}
void intel_guc_ads_destroy(struct intel_guc *guc)
{
i915_vma_unpin_and_release(&guc->ads_vma, 0);
}
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