[v3,1/1] drm/i915/uc: Make GuC/HuC fw fetch and loading functions/file structure symmetric
diff mbox

Message ID 1519922745-25441-1-git-send-email-sagar.a.kamble@intel.com
State New
Headers show

Commit Message

sagar.a.kamble@intel.com March 1, 2018, 4:45 p.m. UTC
GuC load function is named intel_guc_fw_upload() and HuC load function is
named intel_huc_init_hw(). Make them consistent intel_*_fw_upload. Also
move HuC fw loading functions and declarations to separate files
intel_huc_fw.c|h like GuC.

While at this, do below changes
1. Update kernel-doc comment for intel_*_fw_upload() functions
2. s/huc_ucode_xfer/huc_fw_xfer
3. Introduce intel_huc_fw_init_early()

v2: Changed patch to update HuC functions instead of changing
    guc_fw_upload and update file structure. (Michal Wajdeczko)

v3: Added SPDX License identifier to huc_fw.c|h. (Michal Wajdeczko)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/Makefile       |   3 +-
 drivers/gpu/drm/i915/intel_guc_fw.c |  10 +--
 drivers/gpu/drm/i915/intel_huc.c    | 154 +--------------------------------
 drivers/gpu/drm/i915/intel_huc.h    |   2 +-
 drivers/gpu/drm/i915/intel_huc_fw.c | 166 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_huc_fw.h |  15 ++++
 drivers/gpu/drm/i915/intel_uc.c     |   2 +-
 7 files changed, 191 insertions(+), 161 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/intel_huc_fw.c
 create mode 100644 drivers/gpu/drm/i915/intel_huc_fw.h

Comments

Chris Wilson March 2, 2018, 8:31 a.m. UTC | #1
Quoting Sagar Arun Kamble (2018-03-01 16:45:45)
> +static int huc_fw_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
> +{
> +       struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
> +       struct drm_i915_private *dev_priv = huc_to_i915(huc);
> +       unsigned long offset = 0;
> +       u32 size;
> +       int ret;
> +
> +       GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
> +
> +       intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
> +
> +       /* Set the source address for the uCode */
> +       offset = guc_ggtt_offset(vma) + huc_fw->header_offset;
> +       I915_WRITE(DMA_ADDR_0_LOW, lower_32_bits(offset));
> +       I915_WRITE(DMA_ADDR_0_HIGH, upper_32_bits(offset) & 0xFFFF);

So these same registers are used to transfer the guc image. What
serialisation do we have between the two to prevent conflicts?

(lockdep_assert_held the appropriate guard with explanation :)

As it's not a new issue, please follow up with another patch and we'll
apply this in the meantime.
-Chris
Chris Wilson March 2, 2018, 9:09 a.m. UTC | #2
Quoting Sagar Arun Kamble (2018-03-01 16:45:45)
> GuC load function is named intel_guc_fw_upload() and HuC load function is
> named intel_huc_init_hw(). Make them consistent intel_*_fw_upload. Also
> move HuC fw loading functions and declarations to separate files
> intel_huc_fw.c|h like GuC.
> 
> While at this, do below changes
> 1. Update kernel-doc comment for intel_*_fw_upload() functions
> 2. s/huc_ucode_xfer/huc_fw_xfer
> 3. Introduce intel_huc_fw_init_early()
> 
> v2: Changed patch to update HuC functions instead of changing
>     guc_fw_upload and update file structure. (Michal Wajdeczko)
> 
> v3: Added SPDX License identifier to huc_fw.c|h. (Michal Wajdeczko)
> 
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
> Cc: Michal Winiarski <michal.winiarski@intel.com>
> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>

Applied, thanks for the patch and review.
-Chris
sagar.a.kamble@intel.com March 2, 2018, 10:14 a.m. UTC | #3
On 3/2/2018 2:01 PM, Chris Wilson wrote:
> Quoting Sagar Arun Kamble (2018-03-01 16:45:45)
>> +static int huc_fw_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
>> +{
>> +       struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
>> +       struct drm_i915_private *dev_priv = huc_to_i915(huc);
>> +       unsigned long offset = 0;
>> +       u32 size;
>> +       int ret;
>> +
>> +       GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
>> +
>> +       intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
>> +
>> +       /* Set the source address for the uCode */
>> +       offset = guc_ggtt_offset(vma) + huc_fw->header_offset;
>> +       I915_WRITE(DMA_ADDR_0_LOW, lower_32_bits(offset));
>> +       I915_WRITE(DMA_ADDR_0_HIGH, upper_32_bits(offset) & 0xFFFF);
> So these same registers are used to transfer the guc image. What
> serialisation do we have between the two to prevent conflicts?
>
> (lockdep_assert_held the appropriate guard with explanation :)
Yes. Currently they are implicitly serialized by load ordering. Will 
need locking if async load is to be done.
But no harm in adding locking/lockdep now. Will do. Thank you.
> As it's not a new issue, please follow up with another patch and we'll
> apply this in the meantime.
> -Chris
sagar.a.kamble@intel.com March 14, 2018, 9:28 a.m. UTC | #4
On 3/2/2018 3:44 PM, Sagar Arun Kamble wrote:
>
>
> On 3/2/2018 2:01 PM, Chris Wilson wrote:
>> Quoting Sagar Arun Kamble (2018-03-01 16:45:45)
>>> +static int huc_fw_xfer(struct intel_uc_fw *huc_fw, struct i915_vma 
>>> *vma)
>>> +{
>>> +       struct intel_huc *huc = container_of(huc_fw, struct 
>>> intel_huc, fw);
>>> +       struct drm_i915_private *dev_priv = huc_to_i915(huc);
>>> +       unsigned long offset = 0;
>>> +       u32 size;
>>> +       int ret;
>>> +
>>> +       GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
>>> +
>>> +       intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
>>> +
>>> +       /* Set the source address for the uCode */
>>> +       offset = guc_ggtt_offset(vma) + huc_fw->header_offset;
>>> +       I915_WRITE(DMA_ADDR_0_LOW, lower_32_bits(offset));
>>> +       I915_WRITE(DMA_ADDR_0_HIGH, upper_32_bits(offset) & 0xFFFF);
>> So these same registers are used to transfer the guc image. What
>> serialisation do we have between the two to prevent conflicts?
>>
>> (lockdep_assert_held the appropriate guard with explanation :)
> Yes. Currently they are implicitly serialized by load ordering. Will 
> need locking if async load is to be done.
> But no harm in adding locking/lockdep now. Will do. Thank you.
Hi Chris,

Checked more on this and I see that *HuC has to be loaded before GuC 
always* hence we will not have situation of
dma_xfer for them happening in parallel. So we don't need the locking.

Thanks,
Sagar
>> As it's not a new issue, please follow up with another patch and we'll
>> apply this in the meantime.
>> -Chris
>

Patch
diff mbox

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 881d712..1bd9bc5 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -89,7 +89,8 @@  i915-y += intel_uc.o \
 	  intel_guc_fw.o \
 	  intel_guc_log.o \
 	  intel_guc_submission.o \
-	  intel_huc.o
+	  intel_huc.o \
+	  intel_huc_fw.o
 
 # autogenerated null render state
 i915-y += intel_renderstate_gen6.o \
diff --git a/drivers/gpu/drm/i915/intel_guc_fw.c b/drivers/gpu/drm/i915/intel_guc_fw.c
index 3b09329..d07f2b9 100644
--- a/drivers/gpu/drm/i915/intel_guc_fw.c
+++ b/drivers/gpu/drm/i915/intel_guc_fw.c
@@ -269,15 +269,15 @@  static int guc_fw_xfer(struct intel_uc_fw *guc_fw, struct i915_vma *vma)
 }
 
 /**
- * intel_guc_fw_upload() - finish preparing the GuC for activity
+ * intel_guc_fw_upload() - load GuC uCode to device
  * @guc: intel_guc structure
  *
- * Called during driver loading and also after a GPU reset.
+ * Called from intel_uc_init_hw() during driver load, resume from sleep and
+ * after a GPU reset.
  *
- * The main action required here it to load the GuC uCode into the device.
  * The firmware image should have already been fetched into memory by the
- * earlier call to intel_guc_init(), so here we need only check that
- * worked, and then transfer the image to the h/w.
+ * earlier call to intel_uc_init_fw(), so here we need to only check that
+ * fetch succeeded, and then transfer the image to the h/w.
  *
  * Return:	non-zero code on error
  */
diff --git a/drivers/gpu/drm/i915/intel_huc.c b/drivers/gpu/drm/i915/intel_huc.c
index ef9a05d..e37f58e 100644
--- a/drivers/gpu/drm/i915/intel_huc.c
+++ b/drivers/gpu/drm/i915/intel_huc.c
@@ -27,161 +27,9 @@ 
 #include "intel_huc.h"
 #include "i915_drv.h"
 
-/**
- * DOC: HuC Firmware
- *
- * Motivation:
- * GEN9 introduces a new dedicated firmware for usage in media HEVC (High
- * Efficiency Video Coding) operations. Userspace can use the firmware
- * capabilities by adding HuC specific commands to batch buffers.
- *
- * Implementation:
- * The same firmware loader is used as the GuC. However, the actual
- * loading to HW is deferred until GEM initialization is done.
- *
- * Note that HuC firmware loading must be done before GuC loading.
- */
-
-#define BXT_HUC_FW_MAJOR 01
-#define BXT_HUC_FW_MINOR 07
-#define BXT_BLD_NUM 1398
-
-#define SKL_HUC_FW_MAJOR 01
-#define SKL_HUC_FW_MINOR 07
-#define SKL_BLD_NUM 1398
-
-#define KBL_HUC_FW_MAJOR 02
-#define KBL_HUC_FW_MINOR 00
-#define KBL_BLD_NUM 1810
-
-#define HUC_FW_PATH(platform, major, minor, bld_num) \
-	"i915/" __stringify(platform) "_huc_ver" __stringify(major) "_" \
-	__stringify(minor) "_" __stringify(bld_num) ".bin"
-
-#define I915_SKL_HUC_UCODE HUC_FW_PATH(skl, SKL_HUC_FW_MAJOR, \
-	SKL_HUC_FW_MINOR, SKL_BLD_NUM)
-MODULE_FIRMWARE(I915_SKL_HUC_UCODE);
-
-#define I915_BXT_HUC_UCODE HUC_FW_PATH(bxt, BXT_HUC_FW_MAJOR, \
-	BXT_HUC_FW_MINOR, BXT_BLD_NUM)
-MODULE_FIRMWARE(I915_BXT_HUC_UCODE);
-
-#define I915_KBL_HUC_UCODE HUC_FW_PATH(kbl, KBL_HUC_FW_MAJOR, \
-	KBL_HUC_FW_MINOR, KBL_BLD_NUM)
-MODULE_FIRMWARE(I915_KBL_HUC_UCODE);
-
-static void huc_fw_select(struct intel_uc_fw *huc_fw)
-{
-	struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
-	struct drm_i915_private *dev_priv = huc_to_i915(huc);
-
-	GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
-
-	if (!HAS_HUC(dev_priv))
-		return;
-
-	if (i915_modparams.huc_firmware_path) {
-		huc_fw->path = i915_modparams.huc_firmware_path;
-		huc_fw->major_ver_wanted = 0;
-		huc_fw->minor_ver_wanted = 0;
-	} else if (IS_SKYLAKE(dev_priv)) {
-		huc_fw->path = I915_SKL_HUC_UCODE;
-		huc_fw->major_ver_wanted = SKL_HUC_FW_MAJOR;
-		huc_fw->minor_ver_wanted = SKL_HUC_FW_MINOR;
-	} else if (IS_BROXTON(dev_priv)) {
-		huc_fw->path = I915_BXT_HUC_UCODE;
-		huc_fw->major_ver_wanted = BXT_HUC_FW_MAJOR;
-		huc_fw->minor_ver_wanted = BXT_HUC_FW_MINOR;
-	} else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) {
-		huc_fw->path = I915_KBL_HUC_UCODE;
-		huc_fw->major_ver_wanted = KBL_HUC_FW_MAJOR;
-		huc_fw->minor_ver_wanted = KBL_HUC_FW_MINOR;
-	} else {
-		DRM_WARN("%s: No firmware known for this platform!\n",
-			 intel_uc_fw_type_repr(huc_fw->type));
-	}
-}
-
-/**
- * intel_huc_init_early() - initializes HuC struct
- * @huc: intel_huc struct
- *
- * On platforms with HuC selects firmware for uploading
- */
 void intel_huc_init_early(struct intel_huc *huc)
 {
-	struct intel_uc_fw *huc_fw = &huc->fw;
-
-	intel_uc_fw_init(huc_fw, INTEL_UC_FW_TYPE_HUC);
-	huc_fw_select(huc_fw);
-}
-
-/**
- * huc_ucode_xfer() - DMA's the firmware
- * @huc_fw: the firmware descriptor
- * @vma: the firmware image (bound into the GGTT)
- *
- * Transfer the firmware image to RAM for execution by the microcontroller.
- *
- * Return: 0 on success, non-zero on failure
- */
-static int huc_ucode_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
-{
-	struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
-	struct drm_i915_private *dev_priv = huc_to_i915(huc);
-	unsigned long offset = 0;
-	u32 size;
-	int ret;
-
-	GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
-
-	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
-
-	/* Set the source address for the uCode */
-	offset = guc_ggtt_offset(vma) + huc_fw->header_offset;
-	I915_WRITE(DMA_ADDR_0_LOW, lower_32_bits(offset));
-	I915_WRITE(DMA_ADDR_0_HIGH, upper_32_bits(offset) & 0xFFFF);
-
-	/* Hardware doesn't look at destination address for HuC. Set it to 0,
-	 * but still program the correct address space.
-	 */
-	I915_WRITE(DMA_ADDR_1_LOW, 0);
-	I915_WRITE(DMA_ADDR_1_HIGH, DMA_ADDRESS_SPACE_WOPCM);
-
-	size = huc_fw->header_size + huc_fw->ucode_size;
-	I915_WRITE(DMA_COPY_SIZE, size);
-
-	/* Start the DMA */
-	I915_WRITE(DMA_CTRL, _MASKED_BIT_ENABLE(HUC_UKERNEL | START_DMA));
-
-	/* Wait for DMA to finish */
-	ret = intel_wait_for_register_fw(dev_priv, DMA_CTRL, START_DMA, 0, 100);
-
-	DRM_DEBUG_DRIVER("HuC DMA transfer wait over with ret %d\n", ret);
-
-	/* Disable the bits once DMA is over */
-	I915_WRITE(DMA_CTRL, _MASKED_BIT_DISABLE(HUC_UKERNEL));
-
-	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
-
-	return ret;
-}
-
-/**
- * intel_huc_init_hw() - load HuC uCode to device
- * @huc: intel_huc structure
- *
- * Called from intel_uc_init_hw() during driver loading and also after a GPU
- * reset. Be note that HuC loading must be done before GuC loading.
- *
- * The firmware image should have already been fetched into memory by the
- * earlier call to intel_uc_init_fw(), so here we need only check that
- * is succeeded, and then transfer the image to the h/w.
- *
- */
-int intel_huc_init_hw(struct intel_huc *huc)
-{
-	return intel_uc_fw_upload(&huc->fw, huc_ucode_xfer);
+	intel_huc_fw_init_early(huc);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/intel_huc.h b/drivers/gpu/drm/i915/intel_huc.h
index 40039db..5d6e804 100644
--- a/drivers/gpu/drm/i915/intel_huc.h
+++ b/drivers/gpu/drm/i915/intel_huc.h
@@ -26,6 +26,7 @@ 
 #define _INTEL_HUC_H_
 
 #include "intel_uc_fw.h"
+#include "intel_huc_fw.h"
 
 struct intel_huc {
 	/* Generic uC firmware management */
@@ -35,7 +36,6 @@  struct intel_huc {
 };
 
 void intel_huc_init_early(struct intel_huc *huc);
-int intel_huc_init_hw(struct intel_huc *huc);
 int intel_huc_auth(struct intel_huc *huc);
 
 #endif
diff --git a/drivers/gpu/drm/i915/intel_huc_fw.c b/drivers/gpu/drm/i915/intel_huc_fw.c
new file mode 100644
index 0000000..c66afa9
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_huc_fw.c
@@ -0,0 +1,166 @@ 
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2018 Intel Corporation
+ */
+
+#include "intel_huc_fw.h"
+#include "i915_drv.h"
+
+/**
+ * DOC: HuC Firmware
+ *
+ * Motivation:
+ * GEN9 introduces a new dedicated firmware for usage in media HEVC (High
+ * Efficiency Video Coding) operations. Userspace can use the firmware
+ * capabilities by adding HuC specific commands to batch buffers.
+ *
+ * Implementation:
+ * The same firmware loader is used as the GuC. However, the actual
+ * loading to HW is deferred until GEM initialization is done.
+ *
+ * Note that HuC firmware loading must be done before GuC loading.
+ */
+
+#define BXT_HUC_FW_MAJOR 01
+#define BXT_HUC_FW_MINOR 07
+#define BXT_BLD_NUM 1398
+
+#define SKL_HUC_FW_MAJOR 01
+#define SKL_HUC_FW_MINOR 07
+#define SKL_BLD_NUM 1398
+
+#define KBL_HUC_FW_MAJOR 02
+#define KBL_HUC_FW_MINOR 00
+#define KBL_BLD_NUM 1810
+
+#define HUC_FW_PATH(platform, major, minor, bld_num) \
+	"i915/" __stringify(platform) "_huc_ver" __stringify(major) "_" \
+	__stringify(minor) "_" __stringify(bld_num) ".bin"
+
+#define I915_SKL_HUC_UCODE HUC_FW_PATH(skl, SKL_HUC_FW_MAJOR, \
+	SKL_HUC_FW_MINOR, SKL_BLD_NUM)
+MODULE_FIRMWARE(I915_SKL_HUC_UCODE);
+
+#define I915_BXT_HUC_UCODE HUC_FW_PATH(bxt, BXT_HUC_FW_MAJOR, \
+	BXT_HUC_FW_MINOR, BXT_BLD_NUM)
+MODULE_FIRMWARE(I915_BXT_HUC_UCODE);
+
+#define I915_KBL_HUC_UCODE HUC_FW_PATH(kbl, KBL_HUC_FW_MAJOR, \
+	KBL_HUC_FW_MINOR, KBL_BLD_NUM)
+MODULE_FIRMWARE(I915_KBL_HUC_UCODE);
+
+static void huc_fw_select(struct intel_uc_fw *huc_fw)
+{
+	struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
+	struct drm_i915_private *dev_priv = huc_to_i915(huc);
+
+	GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
+
+	if (!HAS_HUC(dev_priv))
+		return;
+
+	if (i915_modparams.huc_firmware_path) {
+		huc_fw->path = i915_modparams.huc_firmware_path;
+		huc_fw->major_ver_wanted = 0;
+		huc_fw->minor_ver_wanted = 0;
+	} else if (IS_SKYLAKE(dev_priv)) {
+		huc_fw->path = I915_SKL_HUC_UCODE;
+		huc_fw->major_ver_wanted = SKL_HUC_FW_MAJOR;
+		huc_fw->minor_ver_wanted = SKL_HUC_FW_MINOR;
+	} else if (IS_BROXTON(dev_priv)) {
+		huc_fw->path = I915_BXT_HUC_UCODE;
+		huc_fw->major_ver_wanted = BXT_HUC_FW_MAJOR;
+		huc_fw->minor_ver_wanted = BXT_HUC_FW_MINOR;
+	} else if (IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) {
+		huc_fw->path = I915_KBL_HUC_UCODE;
+		huc_fw->major_ver_wanted = KBL_HUC_FW_MAJOR;
+		huc_fw->minor_ver_wanted = KBL_HUC_FW_MINOR;
+	} else {
+		DRM_WARN("%s: No firmware known for this platform!\n",
+			 intel_uc_fw_type_repr(huc_fw->type));
+	}
+}
+
+/**
+ * intel_huc_fw_init_early() - initializes HuC firmware struct
+ * @huc: intel_huc struct
+ *
+ * On platforms with HuC selects firmware for uploading
+ */
+void intel_huc_fw_init_early(struct intel_huc *huc)
+{
+	struct intel_uc_fw *huc_fw = &huc->fw;
+
+	intel_uc_fw_init(huc_fw, INTEL_UC_FW_TYPE_HUC);
+	huc_fw_select(huc_fw);
+}
+
+/**
+ * huc_fw_xfer() - DMA's the firmware
+ * @huc_fw: the firmware descriptor
+ * @vma: the firmware image (bound into the GGTT)
+ *
+ * Transfer the firmware image to RAM for execution by the microcontroller.
+ *
+ * Return: 0 on success, non-zero on failure
+ */
+static int huc_fw_xfer(struct intel_uc_fw *huc_fw, struct i915_vma *vma)
+{
+	struct intel_huc *huc = container_of(huc_fw, struct intel_huc, fw);
+	struct drm_i915_private *dev_priv = huc_to_i915(huc);
+	unsigned long offset = 0;
+	u32 size;
+	int ret;
+
+	GEM_BUG_ON(huc_fw->type != INTEL_UC_FW_TYPE_HUC);
+
+	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+
+	/* Set the source address for the uCode */
+	offset = guc_ggtt_offset(vma) + huc_fw->header_offset;
+	I915_WRITE(DMA_ADDR_0_LOW, lower_32_bits(offset));
+	I915_WRITE(DMA_ADDR_0_HIGH, upper_32_bits(offset) & 0xFFFF);
+
+	/* Hardware doesn't look at destination address for HuC. Set it to 0,
+	 * but still program the correct address space.
+	 */
+	I915_WRITE(DMA_ADDR_1_LOW, 0);
+	I915_WRITE(DMA_ADDR_1_HIGH, DMA_ADDRESS_SPACE_WOPCM);
+
+	size = huc_fw->header_size + huc_fw->ucode_size;
+	I915_WRITE(DMA_COPY_SIZE, size);
+
+	/* Start the DMA */
+	I915_WRITE(DMA_CTRL, _MASKED_BIT_ENABLE(HUC_UKERNEL | START_DMA));
+
+	/* Wait for DMA to finish */
+	ret = intel_wait_for_register_fw(dev_priv, DMA_CTRL, START_DMA, 0, 100);
+
+	DRM_DEBUG_DRIVER("HuC DMA transfer wait over with ret %d\n", ret);
+
+	/* Disable the bits once DMA is over */
+	I915_WRITE(DMA_CTRL, _MASKED_BIT_DISABLE(HUC_UKERNEL));
+
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+
+	return ret;
+}
+
+/**
+ * intel_huc_fw_upload() - load HuC uCode to device
+ * @huc: intel_huc structure
+ *
+ * Called from intel_uc_init_hw() during driver load, resume from sleep and
+ * after a GPU reset. Note that HuC must be loaded before GuC.
+ *
+ * The firmware image should have already been fetched into memory by the
+ * earlier call to intel_uc_init_fw(), so here we need to only check that
+ * fetch succeeded, and then transfer the image to the h/w.
+ *
+ * Return:	non-zero code on error
+ */
+int intel_huc_fw_upload(struct intel_huc *huc)
+{
+	return intel_uc_fw_upload(&huc->fw, huc_fw_xfer);
+}
diff --git a/drivers/gpu/drm/i915/intel_huc_fw.h b/drivers/gpu/drm/i915/intel_huc_fw.h
new file mode 100644
index 0000000..8a00a0e
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_huc_fw.h
@@ -0,0 +1,15 @@ 
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2018 Intel Corporation
+ */
+
+#ifndef _INTEL_HUC_FW_H_
+#define _INTEL_HUC_FW_H_
+
+struct intel_huc;
+
+void intel_huc_fw_init_early(struct intel_huc *huc);
+int intel_huc_fw_upload(struct intel_huc *huc);
+
+#endif
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 9f1bac6..8e25474 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -361,7 +361,7 @@  int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 			goto err_out;
 
 		if (USES_HUC(dev_priv)) {
-			ret = intel_huc_init_hw(huc);
+			ret = intel_huc_fw_upload(huc);
 			if (ret)
 				goto err_out;
 		}