[Intel-gfx] [PATCH] drm/i915: add enable_guc_loading parameter
Yu Dai
yu.dai at intel.com
Fri Feb 19 18:23:00 UTC 2016
LGTM.
Reviewed-by: Alex Dai <yu.dai at intel.com>
Thanks,
Alex
On 02/03/2016 04:56 AM, Dave Gordon wrote:
> Split the function of "enable_guc_submission" into two separate options.
> The new one "enable_guc_loading" controls only the *fetching and loading*
> of the GuC firmware image. The existing one is redefined to control only
> the *use* of the GuC for batch submission once the firmware is loaded.
>
> In addition, the degree of control has been refined from a simple bool
> to an integer key, allowing several options:
> -1 (default) whatever the platform default is
> 0 DISABLE don't load/use the GuC
> 1 BEST EFFORT try to load/use the GuC, fallback if not available
> 2 REQUIRE must load/use the GuC, else leave the GPU wedged
>
> The new platform default (as coded here) will be to attempt to load
> the GuC iff the device has a GuC that requires firmware, to attempt to
> use it iff the device has a GuC that supports the submission protocol
> (with or without firmware), and to fall back to execlist mode if any
> required firmware cannot be found or fails to load.
>
> Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_gem.c | 1 -
> drivers/gpu/drm/i915/i915_params.c | 14 ++++-
> drivers/gpu/drm/i915/i915_params.h | 3 +-
> drivers/gpu/drm/i915/intel_guc_loader.c | 99 ++++++++++++++++++---------------
> 4 files changed, 68 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index a928823..cd7aada 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4892,7 +4892,6 @@ int i915_gem_init_rings(struct drm_device *dev)
> ret = intel_guc_ucode_load(dev);
> if (ret) {
> DRM_ERROR("Failed to initialize GuC, error %d\n", ret);
> - ret = -EIO;
> goto out;
> }
> }
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index 8b9f368..ad785ad 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -55,7 +55,8 @@ struct i915_params i915 __read_mostly = {
> .verbose_state_checks = 1,
> .nuclear_pageflip = 0,
> .edp_vswing = 0,
> - .enable_guc_submission = false,
> + .enable_guc_loading = -1,
> + .enable_guc_submission = -1,
> .guc_log_level = -1,
> };
>
> @@ -198,8 +199,15 @@ struct i915_params i915 __read_mostly = {
> "(0=use value from vbt [default], 1=low power swing(200mV),"
> "2=default swing(400mV))");
>
> -module_param_named_unsafe(enable_guc_submission, i915.enable_guc_submission, bool, 0400);
> -MODULE_PARM_DESC(enable_guc_submission, "Enable GuC submission (default:false)");
> +module_param_named_unsafe(enable_guc_loading, i915.enable_guc_loading, int, 0400);
> +MODULE_PARM_DESC(enable_guc_submission,
> + "Enable GuC firmware loading "
> + "(-1=auto [default], 0=never, 1=if available, 2=required)");
> +
> +module_param_named_unsafe(enable_guc_submission, i915.enable_guc_submission, int, 0400);
> +MODULE_PARM_DESC(enable_guc_submission,
> + "Enable GuC submission "
> + "(-1=auto [default], 0=never, 1=if available, 2=required)");
>
> module_param_named(guc_log_level, i915.guc_log_level, int, 0400);
> MODULE_PARM_DESC(guc_log_level,
> diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
> index 5299290..7180261 100644
> --- a/drivers/gpu/drm/i915/i915_params.h
> +++ b/drivers/gpu/drm/i915/i915_params.h
> @@ -45,6 +45,8 @@ struct i915_params {
> int enable_ips;
> int invert_brightness;
> int enable_cmd_parser;
> + int enable_guc_loading;
> + int enable_guc_submission;
> int guc_log_level;
> int use_mmio_flip;
> int mmio_debug;
> @@ -57,7 +59,6 @@ struct i915_params {
> bool reset;
> bool disable_display;
> bool disable_vtd_wa;
> - bool enable_guc_submission;
> bool verbose_state_checks;
> bool nuclear_pageflip;
> };
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index 3accd91..e7eb3db 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -369,49 +369,37 @@ int intel_guc_ucode_load(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
> + const char *fw_path = guc_fw->guc_fw_path;
> int err = 0;
>
> - if (!i915.enable_guc_submission)
> - return 0;
> -
> - DRM_DEBUG_DRIVER("GuC fw status: fetch %s, load %s\n",
> + 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));
>
> - direct_interrupts_to_host(dev_priv);
> + /* Loading forbidden, or no firmware to load? */
> + if (!i915.enable_guc_loading)
> + goto fail;
> + if (fw_path == NULL)
> + goto fail;
> + if (*fw_path == '\0') {
> + DRM_ERROR("No GuC firmware known for this platform\n");
> + goto fail;
> + }
>
> - if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_NONE)
> - return 0;
> + /* Fetch failed, or already fetched but failed to load? */
> + if (guc_fw->guc_fw_fetch_status != GUC_FIRMWARE_SUCCESS)
> + goto fail;
> + if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_FAIL)
> + goto fail;
>
> - if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_SUCCESS &&
> - guc_fw->guc_fw_load_status == GUC_FIRMWARE_FAIL)
> - return -ENOEXEC;
> + direct_interrupts_to_host(dev_priv);
>
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_PENDING;
>
> - DRM_DEBUG_DRIVER("GuC fw fetch status %s\n",
> - intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status));
> -
> - switch (guc_fw->guc_fw_fetch_status) {
> - case GUC_FIRMWARE_FAIL:
> - /* something went wrong :( */
> - err = -EIO;
> - goto fail;
> -
> - case GUC_FIRMWARE_NONE:
> - case GUC_FIRMWARE_PENDING:
> - default:
> - /* "can't happen" */
> - WARN_ONCE(1, "GuC fw %s invalid guc_fw_fetch_status %s [%d]\n",
> - guc_fw->guc_fw_path,
> - intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
> - guc_fw->guc_fw_fetch_status);
> - err = -ENXIO;
> - goto fail;
> -
> - case GUC_FIRMWARE_SUCCESS:
> - break;
> - }
> + 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);
> if (err)
> @@ -440,6 +428,8 @@ int intel_guc_ucode_load(struct drm_device *dev)
> return 0;
>
> fail:
> + DRM_DEBUG_DRIVER("GuC firmware load fail, err %d\n", err);
> +
> if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_PENDING)
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_FAIL;
>
> @@ -447,6 +437,29 @@ int intel_guc_ucode_load(struct drm_device *dev)
> i915_guc_submission_disable(dev);
> i915_guc_submission_fini(dev);
>
> + /*
> + * 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) {
> + err = -EIO;
> + } else if (HAS_GUC_SCHED(dev) && !HAS_GUC_UCODE(dev)) {
> + return 0;
> + } else if (i915.enable_guc_submission > 1) {
> + err = -EIO;
> + } else {
> + err = 0;
> + }
> +
> + i915.enable_guc_submission = 0;
> +
> + DRM_DEBUG_DRIVER("falling back to execlist mode, err %d\n", err);
> +
> return err;
> }
>
> @@ -588,8 +601,11 @@ void intel_guc_ucode_init(struct drm_device *dev)
> struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
> const char *fw_path;
>
> - if (!HAS_GUC_SCHED(dev))
> - i915.enable_guc_submission = false;
> + /* A negative value means "use platform default" */
> + if (i915.enable_guc_loading < 0)
> + i915.enable_guc_loading = HAS_GUC_UCODE(dev);
> + if (i915.enable_guc_submission < 0)
> + i915.enable_guc_submission = HAS_GUC_SCHED(dev);
>
> if (!HAS_GUC_UCODE(dev)) {
> fw_path = NULL;
> @@ -598,26 +614,21 @@ void intel_guc_ucode_init(struct drm_device *dev)
> guc_fw->guc_fw_major_wanted = 4;
> guc_fw->guc_fw_minor_wanted = 3;
> } else {
> - i915.enable_guc_submission = false;
> fw_path = ""; /* unknown device */
> }
>
> - if (!i915.enable_guc_submission)
> - return;
> -
> guc_fw->guc_dev = dev;
> guc_fw->guc_fw_path = fw_path;
> guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_NONE;
> guc_fw->guc_fw_load_status = GUC_FIRMWARE_NONE;
>
> + /* Early (and silent) return if GuC loading is disabled */
> + if (!i915.enable_guc_loading)
> + return;
> if (fw_path == NULL)
> return;
> -
> - if (*fw_path == '\0') {
> - DRM_ERROR("No GuC firmware known for this platform\n");
> - guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_FAIL;
> + if (*fw_path == '\0')
> return;
> - }
>
> guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_PENDING;
> DRM_DEBUG_DRIVER("GuC firmware pending, path %s\n", fw_path);
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