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+/*
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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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+
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+#include "intel_wopcm.h"
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+#include "i915_drv.h"
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+
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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 are calculated are determined by size of HuC/GuC
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+ * firmware size and set of hw requirements/restrictions as shown below:
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+/**
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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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+
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+ DRM_DEBUG_DRIVER("WOPCM size: %uKiB\n", wopcm->size / 1024);
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+}
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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
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+ return 0;
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+}
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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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+ /*
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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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+
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+ return 0;
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+}
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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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+{
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+ int err = 0;
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+
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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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+
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+ return err;
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+}
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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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+
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+ GEM_BUG_ON(!wopcm->size);
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ err = check_hw_restriction(i915, guc_wopcm_base, guc_wopcm_size);
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+ if (err)
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+ return err;
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+
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+ wopcm->guc.base = guc_wopcm_base;
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+ wopcm->guc.size = guc_wopcm_size;
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+
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+ return 0;
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+}
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Jackie Li