276 lines
8.0 KiB
C
276 lines
8.0 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2017-2018 Intel Corporation
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*/
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#include "intel_wopcm.h"
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#include "i915_drv.h"
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/**
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* DOC: WOPCM Layout
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*
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* The layout of the WOPCM will be fixed after writing to GuC WOPCM size and
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* offset registers whose values are calculated and determined by HuC/GuC
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* firmware size and set of hardware requirements/restrictions as shown below:
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*
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* ::
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*
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* +=========> +====================+ <== WOPCM Top
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* ^ | HW contexts RSVD |
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* | +===> +====================+ <== GuC WOPCM Top
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* | ^ | |
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* | | | |
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* | | | |
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* | GuC | |
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* | WOPCM | |
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* | Size +--------------------+
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* WOPCM | | GuC FW RSVD |
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* | | +--------------------+
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* | | | GuC Stack RSVD |
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* | | +------------------- +
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* | v | GuC WOPCM RSVD |
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* | +===> +====================+ <== GuC WOPCM base
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* | | WOPCM RSVD |
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* | +------------------- + <== HuC Firmware Top
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* v | HuC FW |
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* +=========> +====================+ <== WOPCM Base
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*
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* GuC accessible WOPCM starts at GuC WOPCM base and ends at GuC WOPCM top.
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* The top part of the WOPCM is reserved for hardware contexts (e.g. RC6
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* context).
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*/
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/* Default WOPCM size 1MB. */
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#define GEN9_WOPCM_SIZE (1024 * 1024)
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/* 16KB WOPCM (RSVD WOPCM) is reserved from HuC firmware top. */
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#define WOPCM_RESERVED_SIZE (16 * 1024)
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/* 16KB reserved at the beginning of GuC WOPCM. */
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#define GUC_WOPCM_RESERVED (16 * 1024)
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/* 8KB from GUC_WOPCM_RESERVED is reserved for GuC stack. */
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#define GUC_WOPCM_STACK_RESERVED (8 * 1024)
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/* GuC WOPCM Offset value needs to be aligned to 16KB. */
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#define GUC_WOPCM_OFFSET_ALIGNMENT (1UL << GUC_WOPCM_OFFSET_SHIFT)
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/* 24KB at the end of WOPCM is reserved for RC6 CTX on BXT. */
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#define BXT_WOPCM_RC6_CTX_RESERVED (24 * 1024)
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/* 36KB WOPCM reserved at the end of WOPCM on CNL. */
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#define CNL_WOPCM_HW_CTX_RESERVED (36 * 1024)
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/* 128KB from GUC_WOPCM_RESERVED is reserved for FW on Gen9. */
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#define GEN9_GUC_FW_RESERVED (128 * 1024)
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#define GEN9_GUC_WOPCM_OFFSET (GUC_WOPCM_RESERVED + GEN9_GUC_FW_RESERVED)
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/**
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* intel_wopcm_init_early() - Early initialization of the WOPCM.
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* @wopcm: pointer to intel_wopcm.
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*
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* Setup the size of WOPCM which will be used by later on WOPCM partitioning.
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*/
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void intel_wopcm_init_early(struct intel_wopcm *wopcm)
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{
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wopcm->size = GEN9_WOPCM_SIZE;
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DRM_DEBUG_DRIVER("WOPCM size: %uKiB\n", wopcm->size / 1024);
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}
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static inline u32 context_reserved_size(struct drm_i915_private *i915)
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{
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if (IS_GEN9_LP(i915))
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return BXT_WOPCM_RC6_CTX_RESERVED;
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else if (INTEL_GEN(i915) >= 10)
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return CNL_WOPCM_HW_CTX_RESERVED;
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else
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return 0;
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}
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static inline int gen9_check_dword_gap(u32 guc_wopcm_base, u32 guc_wopcm_size)
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{
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u32 offset;
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/*
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* GuC WOPCM size shall be at least a dword larger than the offset from
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* WOPCM base (GuC WOPCM offset from WOPCM base + GEN9_GUC_WOPCM_OFFSET)
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* due to hardware limitation on Gen9.
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*/
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offset = guc_wopcm_base + GEN9_GUC_WOPCM_OFFSET;
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if (offset > guc_wopcm_size ||
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(guc_wopcm_size - offset) < sizeof(u32)) {
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DRM_ERROR("GuC WOPCM size %uKiB is too small. %uKiB needed.\n",
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guc_wopcm_size / 1024,
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(u32)(offset + sizeof(u32)) / 1024);
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return -E2BIG;
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}
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return 0;
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}
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static inline int gen9_check_huc_fw_fits(u32 guc_wopcm_size, u32 huc_fw_size)
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{
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/*
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* On Gen9 & CNL A0, hardware requires the total available GuC WOPCM
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* size to be larger than or equal to HuC firmware size. Otherwise,
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* firmware uploading would fail.
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*/
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if (huc_fw_size > guc_wopcm_size - GUC_WOPCM_RESERVED) {
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DRM_ERROR("HuC FW (%uKiB) won't fit in GuC WOPCM (%uKiB).\n",
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huc_fw_size / 1024,
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(guc_wopcm_size - GUC_WOPCM_RESERVED) / 1024);
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return -E2BIG;
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}
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return 0;
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}
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static inline int check_hw_restriction(struct drm_i915_private *i915,
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u32 guc_wopcm_base, u32 guc_wopcm_size,
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u32 huc_fw_size)
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{
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int err = 0;
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if (IS_GEN9(i915))
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err = gen9_check_dword_gap(guc_wopcm_base, guc_wopcm_size);
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if (!err &&
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(IS_GEN9(i915) || IS_CNL_REVID(i915, CNL_REVID_A0, CNL_REVID_A0)))
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err = gen9_check_huc_fw_fits(guc_wopcm_size, huc_fw_size);
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return err;
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}
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/**
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* intel_wopcm_init() - Initialize the WOPCM structure.
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* @wopcm: pointer to intel_wopcm.
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*
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* This function will partition WOPCM space based on GuC and HuC firmware sizes
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* and will allocate max remaining for use by GuC. This function will also
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* enforce platform dependent hardware restrictions on GuC WOPCM offset and
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* size. It will fail the WOPCM init if any of these checks were failed, so that
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* the following GuC firmware uploading would be aborted.
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*
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* Return: 0 on success, non-zero error code on failure.
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*/
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int intel_wopcm_init(struct intel_wopcm *wopcm)
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{
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struct drm_i915_private *i915 = wopcm_to_i915(wopcm);
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u32 guc_fw_size = intel_uc_fw_get_upload_size(&i915->guc.fw);
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u32 huc_fw_size = intel_uc_fw_get_upload_size(&i915->huc.fw);
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u32 ctx_rsvd = context_reserved_size(i915);
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u32 guc_wopcm_base;
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u32 guc_wopcm_size;
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u32 guc_wopcm_rsvd;
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int err;
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GEM_BUG_ON(!wopcm->size);
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if (guc_fw_size >= wopcm->size) {
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DRM_ERROR("GuC FW (%uKiB) is too big to fit in WOPCM.",
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guc_fw_size / 1024);
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return -E2BIG;
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}
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if (huc_fw_size >= wopcm->size) {
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DRM_ERROR("HuC FW (%uKiB) is too big to fit in WOPCM.",
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huc_fw_size / 1024);
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return -E2BIG;
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}
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guc_wopcm_base = ALIGN(huc_fw_size + WOPCM_RESERVED_SIZE,
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GUC_WOPCM_OFFSET_ALIGNMENT);
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if ((guc_wopcm_base + ctx_rsvd) >= wopcm->size) {
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DRM_ERROR("GuC WOPCM base (%uKiB) is too big.\n",
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guc_wopcm_base / 1024);
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return -E2BIG;
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}
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guc_wopcm_size = wopcm->size - guc_wopcm_base - ctx_rsvd;
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guc_wopcm_size &= GUC_WOPCM_SIZE_MASK;
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DRM_DEBUG_DRIVER("Calculated GuC WOPCM Region: [%uKiB, %uKiB)\n",
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guc_wopcm_base / 1024, guc_wopcm_size / 1024);
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guc_wopcm_rsvd = GUC_WOPCM_RESERVED + GUC_WOPCM_STACK_RESERVED;
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if ((guc_fw_size + guc_wopcm_rsvd) > guc_wopcm_size) {
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DRM_ERROR("Need %uKiB WOPCM for GuC, %uKiB available.\n",
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(guc_fw_size + guc_wopcm_rsvd) / 1024,
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guc_wopcm_size / 1024);
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return -E2BIG;
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}
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err = check_hw_restriction(i915, guc_wopcm_base, guc_wopcm_size,
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huc_fw_size);
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if (err)
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return err;
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wopcm->guc.base = guc_wopcm_base;
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wopcm->guc.size = guc_wopcm_size;
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return 0;
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}
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static inline int write_and_verify(struct drm_i915_private *dev_priv,
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i915_reg_t reg, u32 val, u32 mask,
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u32 locked_bit)
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{
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u32 reg_val;
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GEM_BUG_ON(val & ~mask);
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I915_WRITE(reg, val);
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reg_val = I915_READ(reg);
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return (reg_val & mask) != (val | locked_bit) ? -EIO : 0;
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}
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/**
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* intel_wopcm_init_hw() - Setup GuC WOPCM registers.
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* @wopcm: pointer to intel_wopcm.
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*
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* Setup the GuC WOPCM size and offset registers with the calculated values. It
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* will verify the register values to make sure the registers are locked with
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* correct values.
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*
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* Return: 0 on success. -EIO if registers were locked with incorrect values.
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*/
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int intel_wopcm_init_hw(struct intel_wopcm *wopcm)
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{
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struct drm_i915_private *dev_priv = wopcm_to_i915(wopcm);
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u32 huc_agent;
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u32 mask;
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int err;
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if (!USES_GUC(dev_priv))
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return 0;
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GEM_BUG_ON(!HAS_GUC(dev_priv));
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GEM_BUG_ON(!wopcm->guc.size);
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GEM_BUG_ON(!wopcm->guc.base);
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err = write_and_verify(dev_priv, GUC_WOPCM_SIZE, wopcm->guc.size,
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GUC_WOPCM_SIZE_MASK | GUC_WOPCM_SIZE_LOCKED,
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GUC_WOPCM_SIZE_LOCKED);
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if (err)
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goto err_out;
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huc_agent = USES_HUC(dev_priv) ? HUC_LOADING_AGENT_GUC : 0;
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mask = GUC_WOPCM_OFFSET_MASK | GUC_WOPCM_OFFSET_VALID | huc_agent;
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err = write_and_verify(dev_priv, DMA_GUC_WOPCM_OFFSET,
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wopcm->guc.base | huc_agent, mask,
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GUC_WOPCM_OFFSET_VALID);
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if (err)
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goto err_out;
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return 0;
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err_out:
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DRM_ERROR("Failed to init WOPCM registers:\n");
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DRM_ERROR("DMA_GUC_WOPCM_OFFSET=%#x\n",
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I915_READ(DMA_GUC_WOPCM_OFFSET));
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DRM_ERROR("GUC_WOPCM_SIZE=%#x\n", I915_READ(GUC_WOPCM_SIZE));
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return err;
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}
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