> -----Original Message-----
> From: Intel-gfx <[email protected]> On Behalf Of
> Sujaritha Sundaresan
> Sent: Friday, August 18, 2023 8:16 AM
> To: [email protected]
> Subject: [Intel-gfx] [PATCH] drm/i915: Add intel_pcode_probe
>
> Added intel_pcode_probe, promoted wait for lmem init and intel_pcode_init
> prior to mmio_probe during load, so that GT registers can be accessed only
> after this, else MCA is observed.
>
> Signed-off-by: Sujaritha Sundaresan <[email protected]>
Both DG1 and DG2 crashed during i915_pci_probe.
BAT is failing.
Thanks,
Anshuman Gupta.
> ---
> drivers/gpu/drm/i915/i915_driver.c | 37 ++++++++++++++++++++++++-----
> drivers/gpu/drm/i915/intel_uncore.c | 12 ----------
> 2 files changed, 31 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_driver.c
> b/drivers/gpu/drm/i915/i915_driver.c
> index f8dbee7a5af7..92cafceaf447 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -93,6 +93,7 @@
> #include "i915_memcpy.h"
> #include "i915_perf.h"
> #include "i915_query.h"
> +#include "i915_reg.h"
> #include "i915_suspend.h"
> #include "i915_switcheroo.h"
> #include "i915_sysfs.h"
> @@ -436,6 +437,32 @@ static int i915_pcode_init(struct drm_i915_private
> *i915)
> return 0;
> }
>
> +static int intel_pcode_probe(struct drm_i915_private *i915) {
> + struct intel_uncore *uncore;
> + int ret;
> +
> + /*
> + * The boot firmware initializes local memory and assesses its health.
> + * If memory training fails, the punit will have been instructed to
> + * keep the GT powered down; we won't be able to communicate
> with it
> + * and we should not continue with driver initialization.
> + */
> + if (IS_DGFX(i915) &&
> + !(__raw_uncore_read32(uncore, GU_CNTL) & LMEM_INIT))
> {
> + drm_err(&i915->drm, "LMEM not initialized by firmware\n");
> + return -ENODEV;
> + }
> +
> + /*
> + * Driver handshakes with pcode via mailbox command to know that
> SoC
> + * initialization is complete before proceeding further
> + */
> + ret = i915_pcode_init(i915);
> +
> + return ret;
> +}
> +
> /**
> * i915_driver_hw_probe - setup state requiring device access
> * @dev_priv: device private
> @@ -547,10 +574,6 @@ static int i915_driver_hw_probe(struct
> drm_i915_private *dev_priv)
>
> intel_opregion_setup(dev_priv);
>
> - ret = i915_pcode_init(dev_priv);
> - if (ret)
> - goto err_opregion;
> -
> /*
> * Fill the dram structure to get the system dram info. This will be
> * used for memory latency calculation.
> @@ -561,8 +584,6 @@ static int i915_driver_hw_probe(struct
> drm_i915_private *dev_priv)
>
> return 0;
>
> -err_opregion:
> - intel_opregion_cleanup(dev_priv);
> err_msi:
> if (pdev->msi_enabled)
> pci_disable_msi(pdev);
> @@ -778,6 +799,10 @@ int i915_driver_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
> if (ret < 0)
> goto out_runtime_pm_put;
>
> + ret = intel_pcode_probe(i915);
> + if (ret)
> + goto out_tiles_cleanup;
> +
> ret = i915_driver_mmio_probe(i915);
> if (ret < 0)
> goto out_tiles_cleanup;
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c
> b/drivers/gpu/drm/i915/intel_uncore.c
> index dfefad5a5fec..4a353d4adf86 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -2658,18 +2658,6 @@ int intel_uncore_init_mmio(struct intel_uncore
> *uncore)
> if (ret)
> return ret;
>
> - /*
> - * The boot firmware initializes local memory and assesses its health.
> - * If memory training fails, the punit will have been instructed to
> - * keep the GT powered down; we won't be able to communicate
> with it
> - * and we should not continue with driver initialization.
> - */
> - if (IS_DGFX(i915) &&
> - !(__raw_uncore_read32(uncore, GU_CNTL) & LMEM_INIT)) {
> - drm_err(&i915->drm, "LMEM not initialized by firmware\n");
> - return -ENODEV;
> - }
> -
> if (GRAPHICS_VER(i915) > 5 && !intel_vgpu_active(i915))
> uncore->flags |= UNCORE_HAS_FORCEWAKE;
>
> --
> 2.41.0
