[RFC PATCH 107/162] drm/i915: setup GPU device lmem region

[Chris Wilson]

Quoting Matthew Auld (2020-11-27 12:06:23)
> From: CQ Tang <cq.tang at intel.com>
> 
> The lmem region needs to remove the stolen part.
> 
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Matthew Auld <matthew.auld at intel.com>
> Cc: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> Cc: Chris P Wilson <chris.p.wilson at intel.com>
> Cc: Balestrieri, Francesco <francesco.balestrieri at intel.com>
> Cc: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> Cc: Venkata S Dhanalakota <venkata.s.dhanalakota at intel.com>
> Cc: Neel Desai <neel.desai at intel.com>
> Cc: Matthew Brost <matthew.brost at intel.com>
> Cc: Sudeep Dutt <sudeep.dutt at intel.com>
> Signed-off-by: CQ Tang <cq.tang at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h          |  2 ++
>  drivers/gpu/drm/i915/intel_region_lmem.c | 11 +++++++----
>  2 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 1af1966ac461..0e01ea0cb0a4 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -12066,6 +12066,8 @@ enum skl_power_gate {
>  #define GEN12_LMEM_CFG_ADDR            _MMIO(0xcf58)
>  #define   LMEM_ENABLE                  (1 << 31)
>  
> +#define GEN12_GSMBASE                  _MMIO(0x108100)
> +
>  /* gamt regs */
>  #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
>  #define   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW  0x67F1427F /* max/min for LRA1/2 */
> diff --git a/drivers/gpu/drm/i915/intel_region_lmem.c b/drivers/gpu/drm/i915/intel_region_lmem.c
> index e98582c76de1..7f2b31d469b0 100644
> --- a/drivers/gpu/drm/i915/intel_region_lmem.c
> +++ b/drivers/gpu/drm/i915/intel_region_lmem.c
> @@ -140,20 +140,23 @@ intel_setup_fake_lmem(struct drm_i915_private *i915)
>  static struct intel_memory_region *
>  setup_lmem(struct drm_i915_private *dev_priv)

Am I wrong in thinking lmem should be under gt?

>  {
> +       struct intel_uncore *uncore = &dev_priv->uncore;
>         struct pci_dev *pdev = dev_priv->drm.pdev;
>         struct intel_memory_region *mem;
>         resource_size_t io_start;
> -       resource_size_t size;
> +       resource_size_t lmem_size;
>  
>         /* Enables Local Memory functionality in GAM */
>         I915_WRITE(GEN12_LMEM_CFG_ADDR, I915_READ(GEN12_LMEM_CFG_ADDR) | LMEM_ENABLE);
>  
> +       /* Stolen starts from GSMBASE on DG1 */
> +       lmem_size = intel_uncore_read64(uncore, GEN12_GSMBASE);
> +
>         io_start = pci_resource_start(pdev, 2);
> -       size = pci_resource_len(pdev, 2);

Sanitycheck the two.

size = min(size, lmem_size);

>  
>         mem = intel_memory_region_create(dev_priv,
>                                          0,
> -                                        size,
> +                                        lmem_size,

Ok, stolen is at tail not start. 

>                                          I915_GTT_PAGE_SIZE_4K,
>                                          io_start,
>                                          &intel_region_lmem_ops);
> @@ -162,7 +165,7 @@ setup_lmem(struct drm_i915_private *dev_priv)
>                 DRM_INFO("Intel graphics LMEM IO start: %llx\n",
>                          (u64)mem->io_start);
>                 DRM_INFO("Intel graphics LMEM size: %llx\n",
> -                        (u64)size);
> +                        (u64)lmem_size);

Use the correct printf-formats, %pa.

>         }
>  
>         return mem;
> -- 
> 2.26.2
>
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