drivers/gpu/drm/i915/intel_huc_fw.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2014-2018 Intel Corporation
   5  */
   6
   7 #include "intel_huc_fw.h"
   8 #include "i915_drv.h"
   9
  10 /**
  11  * DOC: HuC Firmware
  12  *
  13  * Motivation:
  14  * GEN9 introduces a new dedicated firmware for usage in media HEVC (High
  15  * Efficiency Video Coding) operations. Userspace can use the firmware
  16  * capabilities by adding HuC specific commands to batch buffers.
  17  *
  18  * Implementation:
  19  * The same firmware loader is used as the GuC. However, the actual
  20  * loading to HW is deferred until GEM initialization is done.
  21  *
  22  * Note that HuC firmware loading must be done before GuC loading.
  23  */
  24
  25 #define BXT_HUC_FW_MAJOR 01
  26 #define BXT_HUC_FW_MINOR 8
  27 #define BXT_BLD_NUM 2893
  28
  29 #define SKL_HUC_FW_MAJOR 01
  30 #define SKL_HUC_FW_MINOR 07
  31 #define SKL_BLD_NUM 1398
  32
  33 #define KBL_HUC_FW_MAJOR 02
  34 #define KBL_HUC_FW_MINOR 00
  35 #define KBL_BLD_NUM 1810
  36
  37 #define HUC_FW_PATH(platform, major, minor, bld_num) \
  38         "i915/" __stringify(platform) "_huc_ver" __stringify(major) "_" \
  39         __stringify(minor) "_" __stringify(bld_num) ".bin"
  40
  41 #define I915_SKL_HUC_UCODE HUC_FW_PATH(skl, SKL_HUC_FW_MAJOR, \
  42         SKL_HUC_FW_MINOR, SKL_BLD_NUM)
  43 MODULE_FIRMWARE(I915_SKL_HUC_UCODE);
  44
  45 #define I915_BXT_HUC_UCODE HUC_FW_PATH(bxt, BXT_HUC_FW_MAJOR, \
  46         BXT_HUC_FW_MINOR, BXT_BLD_NUM)
  47 MODULE_FIRMWARE(I915_BXT_HUC_UCODE);
  48
  49 #define I915_KBL_HUC_UCODE HUC_FW_PATH(kbl, KBL_HUC_FW_MAJOR, \
  50         KBL_HUC_FW_MINOR, KBL_BLD_NUM)
  51 MODULE_FIRMWARE(I915_KBL_HUC_UCODE);
  52
  53 static void huc_fw_select(struct intel_uc_fw *huc_fw)
  54 {
  55         struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
  56         struct drm_i915_private *dev_priv = huc_to_i915(huc);
  57
  58         GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
  59
  60         if (!HAS_HUC(dev_priv))
  61                 return;
  62
  63         if (i915_modparams.huc_firmware_path) {
  64                 huc_fw->path = i915_modparams.huc_firmware_path;
  65                 huc_fw->major_ver_wanted = 0;
  66                 huc_fw->minor_ver_wanted = 0;
  67         } else if (IS_SKYLAKE(dev_priv)) {
  68                 huc_fw->path = I915_SKL_HUC_UCODE;
  69                 huc_fw->major_ver_wanted = SKL_HUC_FW_MAJOR;
  70                 huc_fw->minor_ver_wanted = SKL_HUC_FW_MINOR;
  71         } else if (IS_BROXTON(dev_priv)) {
  72                 huc_fw->path = I915_BXT_HUC_UCODE;
  73                 huc_fw->major_ver_wanted = BXT_HUC_FW_MAJOR;
  74                 huc_fw->minor_ver_wanted = BXT_HUC_FW_MINOR;
  75         } else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) {
  76                 huc_fw->path = I915_KBL_HUC_UCODE;
  77                 huc_fw->major_ver_wanted = KBL_HUC_FW_MAJOR;
  78                 huc_fw->minor_ver_wanted = KBL_HUC_FW_MINOR;
  79         }
  80 }
  81
  82 /**
  83  * intel_huc_fw_init_early() - initializes HuC firmware struct
  84  * @huc: intel_huc struct
  85  *
  86  * On platforms with HuC selects firmware for uploading
  87  */
  88 void intel_huc_fw_init_early(struct intel_huc *huc)
  89 {
  90         struct intel_uc_fw *huc_fw = &huc->fw;
  91
  92         intel_uc_fw_init_early(huc_fw, INTEL_UC_FW_TYPE_HUC);
  93         huc_fw_select(huc_fw);
  94 }
  95
  96 static void huc_xfer_rsa(struct intel_huc *huc)
  97 {
  98         struct intel_uc_fw *fw = &huc->fw;
  99         struct sg_table *pages = fw->obj->mm.pages;
 100
 101         /*
 102          * HuC firmware image is outside GuC accessible range.
 103          * Copy the RSA signature out of the image into
 104          * the perma-pinned region set aside for it
 105          */
 106         sg_pcopy_to_buffer(pages->sgl, pages->nents,
 107                            huc->rsa_data_vaddr, fw->rsa_size,
 108                            fw->rsa_offset);
 109 }
 110
 111 static int huc_xfer_ucode(struct intel_huc *huc)
 112 {
 113         struct intel_uc_fw *huc_fw = &huc->fw;
 114         struct drm_i915_private *dev_priv = huc_to_i915(huc);
 115         struct intel_uncore *uncore = &dev_priv->uncore;
 116         unsigned long offset = 0;
 117         u32 size;
 118         int ret;
 119
 120         GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
 121
 122         intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
 123
 124         /* Set the source address for the uCode */
 125         offset = intel_uc_fw_ggtt_offset(huc_fw) +
 126                  huc_fw->header_offset;
 127         intel_uncore_write(uncore, DMA_ADDR_0_LOW,
 128                            lower_32_bits(offset));
 129         intel_uncore_write(uncore, DMA_ADDR_0_HIGH,
 130                            upper_32_bits(offset) & 0xFFFF);
 131
 132         /*
 133          * Hardware doesn't look at destination address for HuC. Set it to 0,
 134          * but still program the correct address space.
 135          */
 136         intel_uncore_write(uncore, DMA_ADDR_1_LOW, 0);
 137         intel_uncore_write(uncore, DMA_ADDR_1_HIGH, DMA_ADDRESS_SPACE_WOPCM);
 138
 139         size = huc_fw->header_size + huc_fw->ucode_size;
 140         intel_uncore_write(uncore, DMA_COPY_SIZE, size);
 141
 142         /* Start the DMA */
 143         intel_uncore_write(uncore, DMA_CTRL,
 144                            _MASKED_BIT_ENABLE(HUC_UKERNEL | START_DMA));
 145
 146         /* Wait for DMA to finish */
 147         ret = intel_wait_for_register_fw(uncore, DMA_CTRL, START_DMA, 0, 100);
 148
 149         DRM_DEBUG_DRIVER("HuC DMA transfer wait over with ret %d\n", ret);
 150
 151         /* Disable the bits once DMA is over */
 152         intel_uncore_write(uncore, DMA_CTRL, _MASKED_BIT_DISABLE(HUC_UKERNEL));
 153
 154         intel_uncore_forcewake_put(uncore, FORCEWAKE_ALL);
 155
 156         return ret;
 157 }
 158
 159 /**
 160  * huc_fw_xfer() - DMA's the firmware
 161  * @huc_fw: the firmware descriptor
 162  *
 163  * Transfer the firmware image to RAM for execution by the microcontroller.
 164  *
 165  * Return: 0 on success, non-zero on failure
 166  */
 167 static int huc_fw_xfer(struct intel_uc_fw *huc_fw)
 168 {
 169         struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
 170
 171         huc_xfer_rsa(huc);
 172
 173         return huc_xfer_ucode(huc);
 174 }
 175
 176 /**
 177  * intel_huc_fw_upload() - load HuC uCode to device
 178  * @huc: intel_huc structure
 179  *
 180  * Called from intel_uc_init_hw() during driver load, resume from sleep and
 181  * after a GPU reset. Note that HuC must be loaded before GuC.
 182  *
 183  * The firmware image should have already been fetched into memory, so only
 184  * check that fetch succeeded, and then transfer the image to the h/w.
 185  *
 186  * Return:      non-zero code on error
 187  */
 188 int intel_huc_fw_upload(struct intel_huc *huc)
 189 {
 190         return intel_uc_fw_upload(&huc->fw, huc_fw_xfer);
 191 }