Re: [PATCH] drm/i915: Make 48bit full ppgtt configuration generic (v2)

Rodrigo Vivi
2018-09-06T21:10:45Z

On Thu, Sep 06, 2018 at 01:04:09PM -0700, Bob Paauwe wrote:
> 48 bit ppgtt device configuration is really just extended address
> range full ppgtt and may actually be something other than 48 bits.
>
> Change USES_FULL_48BIT_PPGTT() to USES_FULL_4LVL_PPGTT() to better
> describe that a 4 level walk table extended range PPGTT is being
> used. Add a new device info field that specifies the number of
> bits to prepare for cases where the range is not 32 or 48 bits.
>
> v2: keep USES_FULL_PPGTT() unchanged (Chris)
>
> Signed-off-by: Bob Paauwe <bob.j.paauwe@intel.com>
> CC: Rodrigo Vivi <rodrigo.vivi@intel.com>
> CC: Michel Thierry <michel.thierry@intel.com>
> CC: Chris Wilson <chris@chris-wilson.co.uk>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 +-
> drivers/gpu/drm/i915/i915_gem_gtt.c | 19 ++++++++++---------
> drivers/gpu/drm/i915/i915_pci.c | 7 +++++--
> drivers/gpu/drm/i915/intel_device_info.h | 3 +++
> drivers/gpu/drm/i915/selftests/huge_pages.c | 2 +-
> drivers/gpu/drm/i915/selftests/mock_gem_device.c | 2 ++
> 6 files changed, 22 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 5a4da5b723fd..a367686fd735 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2569,7 +2569,7 @@ intel_info(const struct drm_i915_private *dev_priv)
>
> #define USES_PPGTT(dev_priv) (i915_modparams.enable_ppgtt)
> #define USES_FULL_PPGTT(dev_priv) (i915_modparams.enable_ppgtt >= 2)
> -#define USES_FULL_48BIT_PPGTT(dev_priv) (i915_modparams.enable_ppgtt == 3)
> +#define USES_FULL_4LVL_PPGTT(dev_priv) ((dev_priv)->info.full_ppgtt_bits > 32)
> #define HAS_PAGE_SIZES(dev_priv, sizes) ({ \
> GEM_BUG_ON((sizes) == 0); \
> ((sizes) & ~(dev_priv)->info.page_sizes) == 0; \
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index eb0e446d6482..530a4c1452b3 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -137,18 +137,18 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
> int enable_ppgtt)
> {
> bool has_full_ppgtt;
> - bool has_full_48bit_ppgtt;
> + bool has_full_4lvl_ppgtt;
>
> if (!dev_priv->info.has_aliasing_ppgtt)
> return 0;
>
> has_full_ppgtt = dev_priv->info.has_full_ppgtt;
> - has_full_48bit_ppgtt = dev_priv->info.has_full_48bit_ppgtt;
> + has_full_4lvl_ppgtt = USES_FULL_4LVL_PPGTT(dev_priv);
>
> if (intel_vgpu_active(dev_priv)) {
> /* GVT-g has no support for 32bit ppgtt */
> has_full_ppgtt = false;
> - has_full_48bit_ppgtt = intel_vgpu_has_full_48bit_ppgtt(dev_priv);
> + has_full_4lvl_ppgtt = intel_vgpu_has_full_48bit_ppgtt(dev_priv);

I wonder if we should already rename this function to match 4lvl instead
of full and/or 48bit on it.

> }
>
> /*
> @@ -164,7 +164,7 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
> if (enable_ppgtt == 2 && has_full_ppgtt)
> return 2;
>
> - if (enable_ppgtt == 3 && has_full_48bit_ppgtt)
> + if (enable_ppgtt == 3 && has_full_4lvl_ppgtt)
> return 3;
>
> /* Disable ppgtt on SNB if VT-d is on. */
> @@ -173,7 +173,7 @@ int intel_sanitize_enable_ppgtt(struct drm_i915_private *dev_priv,
> return 0;
> }
>
> - if (has_full_48bit_ppgtt)
> + if (has_full_4lvl_ppgtt)
> return 3;
>
> if (has_full_ppgtt)
> @@ -1647,9 +1647,10 @@ static struct i915_hw_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
> ppgtt->vm.i915 = i915;
> ppgtt->vm.dma = &i915->drm.pdev->dev;
>
> - ppgtt->vm.total = USES_FULL_48BIT_PPGTT(i915) ?
> - 1ULL << 48 :
> - 1ULL << 32;
> + if ((i915_modparams.enable_ppgtt < 3) && USES_FULL_4LVL_PPGTT(i915))
> + ppgtt->vm.total = 1ULL << 32;
> + else
> + ppgtt->vm.total = 1ULL << i915->info.full_ppgtt_bits;
>
> /*
> * From bdw, there is support for read-only pages in the PPGTT.
> @@ -1788,7 +1789,7 @@ static void gen8_ppgtt_enable(struct drm_i915_private *dev_priv)
> enum intel_engine_id id;
>
> for_each_engine(engine, dev_priv, id) {
> - u32 four_level = USES_FULL_48BIT_PPGTT(dev_priv) ?
> + u32 four_level = USES_FULL_4LVL_PPGTT(dev_priv) ?
> GEN8_GFX_PPGTT_48B : 0;
> I915_WRITE(RING_MODE_GEN7(engine),
> _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE | four_level));
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index d6f7b9fe1d26..a99c1f6de64e 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -299,6 +299,7 @@ static const struct intel_device_info intel_sandybridge_m_gt2_info = {
> .has_rc6p = 1, \
> .has_aliasing_ppgtt = 1, \
> .has_full_ppgtt = 1, \
> + .full_ppgtt_bits = 32, \
> GEN_DEFAULT_PIPEOFFSETS, \
> GEN_DEFAULT_PAGE_SIZES, \
> IVB_CURSOR_OFFSETS
> @@ -353,6 +354,7 @@ static const struct intel_device_info intel_valleyview_info = {
> .has_hotplug = 1,
> .has_aliasing_ppgtt = 1,
> .has_full_ppgtt = 1,
> + .full_ppgtt_bits = 32, \
> .has_snoop = true,
> .has_coherent_ggtt = false,
> .ring_mask = RENDER_RING | BSD_RING | BLT_RING,
> @@ -399,7 +401,7 @@ static const struct intel_device_info intel_haswell_gt3_info = {
> .page_sizes = I915_GTT_PAGE_SIZE_4K | \
> I915_GTT_PAGE_SIZE_2M, \
> .has_logical_ring_contexts = 1, \
> - .has_full_48bit_ppgtt = 1, \
> + .full_ppgtt_bits = 48, \
> .has_64bit_reloc = 1, \
> .has_reset_engine = 1
>
> @@ -445,6 +447,7 @@ static const struct intel_device_info intel_cherryview_info = {
> .has_gmch_display = 1,
> .has_aliasing_ppgtt = 1,
> .has_full_ppgtt = 1,
> + .full_ppgtt_bits = 32, \
> .has_reset_engine = 1,
> .has_snoop = true,
> .has_coherent_ggtt = false,
> @@ -520,7 +523,7 @@ static const struct intel_device_info intel_skylake_gt4_info = {
> .has_guc = 1, \
> .has_aliasing_ppgtt = 1, \
> .has_full_ppgtt = 1, \
> - .has_full_48bit_ppgtt = 1, \
> + .full_ppgtt_bits = 48, \
> .has_reset_engine = 1, \
> .has_snoop = true, \
> .has_coherent_ggtt = false, \
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
> index 6eecd64734d5..083590e98195 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -182,6 +182,9 @@ struct intel_device_info {
> u16 degamma_lut_size;
> u16 gamma_lut_size;
> } color;
> +
> + /* PPGTT bit size */
> + int full_ppgtt_bits;
> };
>
> struct intel_driver_caps {
> diff --git a/drivers/gpu/drm/i915/selftests/huge_pages.c b/drivers/gpu/drm/i915/selftests/huge_pages.c
> index e272127783fe..9f74244ef3e1 100644
> --- a/drivers/gpu/drm/i915/selftests/huge_pages.c
> +++ b/drivers/gpu/drm/i915/selftests/huge_pages.c
> @@ -1434,7 +1434,7 @@ static int igt_ppgtt_pin_update(void *arg)
> * huge-gtt-pages.
> */
>
> - if (!USES_FULL_48BIT_PPGTT(dev_priv)) {
> + if (!USES_FULL_4LVL_PPGTT(dev_priv)) {
> pr_info("48b PPGTT not supported, skipping\n");
> return 0;
> }
> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> index 43ed8b28aeaa..33d7225edbbb 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
> @@ -181,6 +181,8 @@ struct drm_i915_private *mock_gem_device(void)
> I915_GTT_PAGE_SIZE_64K |
> I915_GTT_PAGE_SIZE_2M;
>
> + mkwrite_device_info(i915)->full_ppgtt_bits = 48;
> +
> mock_uncore_init(i915);
> i915_gem_init__mm(i915);
>
> --
> 2.14.4
>