[Intel-gfx] [PATCH 3/5] drm/i915/guc: Simplify intel_guc_load()
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Fri Dec 16 15:50:33 UTC 2016
On 15/12/2016 15:47, Arkadiusz Hiler wrote:
> Current version of intel_guc_load() does a lot:
> - cares about submission
> - loads huc
Not yet, no? So instead you could say that you are preparing the
groundworks to make adding in the HuC fit better.
> - implement WA
>
> This change offloads some of the logic to intel_uc_load(), which now
> cares about the above.
>
> Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
> Cc: Jeff McGee <jeff.mcgee at intel.com>
> Cc: Michal Winiarski <michal.winiarski at intel.com>
> Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 2 +-
> drivers/gpu/drm/i915/intel_guc_loader.c | 126 +++++---------------------------
> drivers/gpu/drm/i915/intel_uc.c | 83 +++++++++++++++++++++
> drivers/gpu/drm/i915/intel_uc.h | 8 ++
> 4 files changed, 110 insertions(+), 109 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 6af4e85..76b52c6 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4412,7 +4412,7 @@ i915_gem_init_hw(struct drm_i915_private *dev_priv)
> intel_mocs_init_l3cc_table(dev_priv);
>
> /* We can't enable contexts until all firmware is loaded */
> - ret = intel_guc_load(dev_priv);
> + ret = intel_uc_load(dev_priv);
> if (ret)
> goto out;
>
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index f8b28b1..b76b556 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -97,7 +97,7 @@ const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status)
> }
> };
>
> -static void guc_interrupts_release(struct drm_i915_private *dev_priv)
> +void guc_interrupts_release(struct drm_i915_private *dev_priv)
> {
> struct intel_engine_cs *engine;
> enum intel_engine_id id;
> @@ -115,7 +115,7 @@ static void guc_interrupts_release(struct drm_i915_private *dev_priv)
> I915_WRITE(GUC_WD_VECS_IER, 0);
> }
>
> -static void guc_interrupts_capture(struct drm_i915_private *dev_priv)
> +void guc_interrupts_capture(struct drm_i915_private *dev_priv)
> {
> struct intel_engine_cs *engine;
> enum intel_engine_id id;
> @@ -334,7 +334,7 @@ static int guc_ucode_xfer_dma(struct drm_i915_private *dev_priv,
> return ret;
> }
>
> -static u32 guc_wopcm_size(struct drm_i915_private *dev_priv)
> +u32 guc_wopcm_size(struct drm_i915_private *dev_priv)
> {
> u32 wopcm_size = GUC_WOPCM_TOP;
>
> @@ -417,7 +417,7 @@ static int guc_ucode_xfer(struct drm_i915_private *dev_priv)
> return ret;
> }
>
> -static int guc_hw_reset(struct drm_i915_private *dev_priv)
> +int guc_hw_reset(struct drm_i915_private *dev_priv)
> {
> int ret;
> u32 guc_status;
> @@ -452,75 +452,37 @@ int intel_guc_load(struct drm_i915_private *dev_priv)
> {
> struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
> const char *fw_path = guc_fw->guc_fw_path;
> - int retries, ret, err;
> + int ret;
>
> DRM_DEBUG_DRIVER("GuC fw status: path %s, fetch %s, load %s\n",
> fw_path,
> intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
> intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
>
> - /* Loading forbidden, or no firmware to load? */
> - if (!i915.enable_guc_loading) {
> - err = 0;
> - goto fail;
> - } else if (fw_path == NULL) {
> + if (fw_path == NULL) {
> /* Device is known to have no uCode (e.g. no GuC) */
> - err = -ENXIO;
> - goto fail;
> + return -ENXIO;
> } else if (*fw_path == '\0') {
> /* Device has a GuC but we don't know what f/w to load? */
> WARN(1, "No GuC firmware known for this platform!\n");
> - err = -ENODEV;
> - goto fail;
> + return -ENODEV;
> }
>
> /* Fetch failed, or already fetched but failed to load? */
> if (guc_fw->guc_fw_fetch_status != GUC_FIRMWARE_SUCCESS) {
> - err = -EIO;
> - goto fail;
> + return -EIO;
> } else if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_FAIL) {
> - err = -ENOEXEC;
> - goto fail;
> + return -ENOEXEC;
> }
>
> - guc_interrupts_release(dev_priv);
> - gen9_reset_guc_interrupts(dev_priv);
> -
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_PENDING;
>
> - DRM_DEBUG_DRIVER("GuC fw status: fetch %s, load %s\n",
> - intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
> - intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
> -
> - err = i915_guc_submission_init(dev_priv);
> - if (err)
> - goto fail;
> -
> - /*
> - * WaEnableuKernelHeaderValidFix:skl,bxt
> - * For BXT, this is only upto B0 but below WA is required for later
> - * steppings also so this is extended as well.
> - */
> /* WaEnableGuCBootHashCheckNotSet:skl,bxt */
> - for (retries = 3; ; ) {
> - /*
> - * Always reset the GuC just before (re)loading, so
> - * that the state and timing are fairly predictable
> - */
> - err = guc_hw_reset(dev_priv);
> - if (err)
> - goto fail;
> + /* we may want to retry guc ucode transfer */
> + ret = guc_ucode_xfer(dev_priv);
>
> - err = guc_ucode_xfer(dev_priv);
> - if (!err)
> - break;
> -
> - if (--retries == 0)
> - goto fail;
> -
> - DRM_INFO("GuC fw load failed: %d; will reset and "
> - "retry %d more time(s)\n", err, retries);
> - }
> + if (ret)
> + return -EAGAIN;
>
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_SUCCESS;
>
> @@ -528,63 +490,7 @@ int intel_guc_load(struct drm_i915_private *dev_priv)
> intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
> intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
>
> - if (i915.enable_guc_submission) {
> - if (i915.guc_log_level >= 0)
> - gen9_enable_guc_interrupts(dev_priv);
> -
> - err = i915_guc_submission_enable(dev_priv);
> - if (err)
> - goto fail;
> - guc_interrupts_capture(dev_priv);
> - }
> -
> return 0;
> -
> -fail:
> - if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_PENDING)
> - guc_fw->guc_fw_load_status = GUC_FIRMWARE_FAIL;
You seem to have lost this state transition at least in the
enable_guc_loading = 0 case. Was that deliberate? I have no idea if that
is important so just an observation.
> -
> - guc_interrupts_release(dev_priv);
> - i915_guc_submission_disable(dev_priv);
> - i915_guc_submission_fini(dev_priv);
> -
> - /*
> - * We've failed to load the firmware :(
> - *
> - * Decide whether to disable GuC submission and fall back to
> - * execlist mode, and whether to hide the error by returning
> - * zero or to return -EIO, which the caller will treat as a
> - * nonfatal error (i.e. it doesn't prevent driver load, but
> - * marks the GPU as wedged until reset).
> - */
> - if (i915.enable_guc_loading > 1) {
> - ret = -EIO;
> - } else if (i915.enable_guc_submission > 1) {
> - ret = -EIO;
> - } else {
> - ret = 0;
> - }
> -
> - if (err == 0 && !HAS_GUC_UCODE(dev_priv))
> - ; /* Don't mention the GuC! */
> - else if (err == 0)
> - DRM_INFO("GuC firmware load skipped\n");
> - else if (ret != -EIO)
> - DRM_NOTE("GuC firmware load failed: %d\n", err);
> - else
> - DRM_WARN("GuC firmware load failed: %d\n", err);
> -
> - if (i915.enable_guc_submission) {
> - if (fw_path == NULL)
> - DRM_INFO("GuC submission without firmware not supported\n");
> - if (ret == 0)
> - DRM_NOTE("Falling back from GuC submission to execlist mode\n");
> - else
> - DRM_ERROR("GuC init failed: %d\n", ret);
> - }
> - i915.enable_guc_submission = 0;
> -
> - return ret;
> }
>
> static void guc_fw_fetch(struct drm_i915_private *dev_priv,
> @@ -757,6 +663,10 @@ void intel_guc_init(struct drm_i915_private *dev_priv)
> guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_NONE;
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_NONE;
>
> + /* can't enable guc submission without guc */
> + if (!i915.enable_guc_loading)
> + i915.enable_guc_submission = 0;
> +
> /* Early (and silent) return if GuC loading is disabled */
> if (!i915.enable_guc_loading)
> return;
You got two same conditions one after another, maybe merge them?
> diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
> index 8eec035..4e184edb 100644
> --- a/drivers/gpu/drm/i915/intel_uc.c
> +++ b/drivers/gpu/drm/i915/intel_uc.c
> @@ -35,6 +35,89 @@ void intel_uc_init(struct drm_i915_private *dev_priv)
> intel_guc_init(dev_priv);
> }
>
> +int intel_uc_load(struct drm_i915_private *dev_priv)
> +{
> + struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
> + int ret, retries;
> +
> + /* guc not enabled, nothing to do */
> + if (!i915.enable_guc_loading)
> + return 0;
> +
> + guc_interrupts_release(dev_priv);
> + gen9_reset_guc_interrupts(dev_priv);
> +
> + guc_fw->guc_fw_load_status = GUC_FIRMWARE_PENDING;
> +
> + if (i915.enable_guc_submission) {
> + ret = i915_guc_submission_init(dev_priv);
> + if (ret)
> + goto fail;
> + }
> +
> + /* WaEnableGuCBootHashCheckNotSet:skl,bxt */
> + retries = GUC_WA_HASH_CHECK_NOT_SET_ATTEPMTS;
> + while (retries--) {
> + /*
> + * Always reset the GuC just before (re)loading, so
> + * that the state and timing are fairly predictable
> + */
> + ret = guc_hw_reset(dev_priv);
> + if (ret)
> + goto fail;
> +
> + ret = intel_guc_load(dev_priv);
> + if (ret == 0 || ret != -EAGAIN)
> + break;
> +
> + DRM_INFO("GuC fw load failed: %d; will reset and "
> + "retry %d more time(s)\n", ret, retries);
> + }
> +
> + /* did we succeded or run out of retries? */
"Have we succeeded" I think.
> + if (ret)
> + goto fail;
There was a debug message round about here I think which logged that the
firmware was successfully loaded. I think it is good to have it. I think
even logging the major and minor would be good and maybe even at
informational level?
> +
> + if (i915.enable_guc_submission) {
> + if (i915.guc_log_level >= 0)
> + gen9_enable_guc_interrupts(dev_priv);
> +
> + ret = i915_guc_submission_enable(dev_priv);
> + if (ret)
> + goto fail;
> + guc_interrupts_capture(dev_priv);
> + }
> +
> + return 0;
> +
> +fail:
> + /*
> + * We've failed to load the firmware :(
> + *
> + * Decide whether to disable GuC submission and fall back to
> + * execlist mode, and whether to hide the error by returning
> + * zero or to return -EIO, which the caller will treat as a
> + * nonfatal error (i.e. it doesn't prevent driver load, but
> + * marks the GPU as wedged until reset).
> + */
> + if (i915.enable_guc_loading > 1 || i915.enable_guc_submission > 1)
> + ret = -EIO;
> + else
> + ret = 0;
> +
> + if (i915.enable_guc_submission) {
> + i915.enable_guc_submission = 0;
> + DRM_INFO("GuC submission without firmware not supported\n");
> + DRM_NOTE("Falling back from GuC submission to execlist mode\n");
> + }
> +
> + guc_interrupts_release(dev_priv);
> + i915_guc_submission_disable(dev_priv);
> + i915_guc_submission_fini(dev_priv);
> +
> + return ret;
> +}
> +
> /*
> * Read GuC command/status register (SOFT_SCRATCH_0)
> * Return true if it contains a response rather than a command
> diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
> index ec1a5b2..89c7e1f 100644
> --- a/drivers/gpu/drm/i915/intel_uc.h
> +++ b/drivers/gpu/drm/i915/intel_uc.h
> @@ -28,6 +28,9 @@
> #include "i915_guc_reg.h"
> #include "intel_ringbuffer.h"
>
> +/* WaEnableGuCBootHashCheckNotSet:skl,bxt */
> +#define GUC_WA_HASH_CHECK_NOT_SET_ATTEPMTS 3
> +
> struct drm_i915_gem_request;
>
> /*
> @@ -171,6 +174,7 @@ struct intel_guc {
> /* intel_uc.c */
> void intel_uc_init_early(struct drm_i915_private *dev_priv);
> void intel_uc_init(struct drm_i915_private *dev_priv);
> +int intel_uc_load(struct drm_i915_private *dev_priv);
> bool intel_guc_recv(struct drm_i915_private *dev_priv, u32 *status);
> int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len);
> int intel_guc_sample_forcewake(struct intel_guc *guc);
> @@ -185,6 +189,10 @@ extern void intel_guc_fini(struct drm_i915_private *dev_priv);
> extern const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status);
> extern int intel_guc_suspend(struct drm_i915_private *dev_priv);
> extern int intel_guc_resume(struct drm_i915_private *dev_priv);
> +void guc_interrupts_release(struct drm_i915_private *dev_priv);
> +void guc_interrupts_capture(struct drm_i915_private *dev_priv);
> +int guc_hw_reset(struct drm_i915_private *dev_priv);
> +u32 guc_wopcm_size(struct drm_i915_private *dev_priv);
>
> /* i915_guc_submission.c */
> int i915_guc_submission_init(struct drm_i915_private *dev_priv);
>
I was just reading it so I can review 5/5 as you have asked me to look
at that one.
Regards,
Tvrtko
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