On Mon, 2022-03-07 at 19:10 +0530, Ramalingam C wrote:
> Xe-HP and latest devices support Flat CCS which reserved a portion of
> the device memory to store compression metadata, during the clearing
> of
> device memory buffer object we also need to clear the associated
> CCS buffer.
>
> XY_FAST_COLOR_BLT cmd provides a option to clear the ccs metadata
> corresponding to the main memory that is cleared. So on Flat-CCS
> capable
> platform we use this option to clear the CCS meta data along with
> main
> memory.
>
> v2: Fixed issues with platform naming [Lucas]
> v3: Rebased [Ram]
> Used the round_up funcs [Bob]
> v4: Fixed ccs blk calculation [Ram]
> Added Kdoc on flat-ccs.
> v5: GENMASK is used [Matt]
> mocs fix [Matt]
> Comments Fix [Matt]
> Flush address programming [Ram]
> v6: FLUSH_DW is fixed
> Few coding style fix
> v7: Adopting the XY_FAST_COLOR_BLT (Thomas]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Signed-off-by: Ayaz A Siddiqui <ayaz.siddiqui@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 3 ++
> drivers/gpu/drm/i915/gt/intel_migrate.c | 39
> ++++++++++++++++++--
> 2 files changed, 39 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> index 925e55b6a94f..34cead49f35e 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
> @@ -207,8 +207,11 @@
> #define XY_COLOR_BLT_CMD (2 << 29 | 0x50 << 22)
> #define XY_FAST_COLOR_BLT_CMD (2 << 29 | 0x44 << 22)
> #define XY_FAST_COLOR_BLT_DEPTH_32 (2 << 19)
> +#define FAST_CLEAR_0 (2 << 12)
> #define XY_FAST_COLOR_BLT_DW 16
> #define XY_FAST_COLOR_BLT_MOCS_MASK GENMASK(27, 21)
> +#define XY_FAST_COLOR_BLT_AUX_MASK GENMASK(20, 18)
> +#define XY_FAST_COLOR_BLT_AUX_CCS_E 5
> #define XY_FAST_COLOR_BLT_MEM_TYPE_SHIFT 31
> #define SRC_COPY_BLT_CMD (2 << 29 | 0x43 << 22)
> #define GEN9_XY_FAST_COPY_BLT_CMD (2 << 29 | 0x42 << 22)
> diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c
> b/drivers/gpu/drm/i915/gt/intel_migrate.c
> index cb68f7bf6b28..05262f1b438e 100644
> --- a/drivers/gpu/drm/i915/gt/intel_migrate.c
> +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
> @@ -469,6 +469,34 @@ static bool wa_1209644611_applies(int ver, u32
> size)
> return height % 4 == 3 && height <= 8;
> }
>
> +/**
> + * DOC: Flat-CCS - Memory compression for Local memory
> + *
> + * On Xe-HP and later devices, we use dedicated compression control
> state (CCS)
> + * stored in local memory for each surface, to support the 3D and
> media
> + * compression formats.
> + *
> + * The memory required for the CCS of the entire local memory is
> 1/256 of the
> + * local memory size. So before the kernel boot, the required memory
> is reserved
> + * for the CCS data and a secure register will be programmed with
> the CCS base
> + * address.
> + *
> + * Flat CCS data needs to be cleared when a lmem object is
> allocated.
> + * And CCS data can be copied in and out of CCS region through
> + * XY_CTRL_SURF_COPY_BLT. CPU can't access the CCS data directly.
> + *
> + * When we exhaust the lmem, if the object's placements support
> smem, then we can
> + * directly decompress the compressed lmem object into smem and
> start using it
> + * from smem itself.
> + *
> + * But when we need to swapout the compressed lmem object into a
> smem region
> + * though objects' placement doesn't support smem, then we copy the
> lmem content
> + * as it is into smem region along with ccs data (using
> XY_CTRL_SURF_COPY_BLT).
> + * When the object is referred, lmem content will be swaped in along
> with
> + * restoration of the CCS data (using XY_CTRL_SURF_COPY_BLT) at
> corresponding
> + * location.
> + */
> +
> static int emit_copy(struct i915_request *rq,
> u32 dst_offset, u32 src_offset, int size)
> {
> @@ -621,8 +649,8 @@ static int emit_clear(struct i915_request *rq,
> u64 offset, int size,
> {
> struct drm_i915_private *i915 = rq->engine->i915;
> int mocs = rq->engine->gt->mocs.uc_index << 1;
> + u32 *cs, spl_mode = 0, aux = 0, mem_type = 0;
> const int ver = GRAPHICS_VER(i915);
> - u32 *cs, mem_type = 0;
> int ring_sz;
>
> GEM_BUG_ON(size >> PAGE_SHIFT > S16_MAX);
> @@ -644,10 +672,15 @@ static int emit_clear(struct i915_request *rq,
> u64 offset, int size,
> return PTR_ERR(cs);
>
> if (ver >= 12) {
> + if (HAS_FLAT_CCS(i915)) {
> + spl_mode = FAST_CLEAR_0;
> + aux = FIELD_PREP(XY_FAST_COLOR_BLT_AUX_MASK,
Did you have a chance to verify that this actually works, and whether
setting aux will clear just the CCS data or both CCS & main DATA?
If so,
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> +
> XY_FAST_COLOR_BLT_AUX_CCS_E);
> + }
> *cs++ = XY_FAST_COLOR_BLT_CMD |
> XY_FAST_COLOR_BLT_DEPTH_32 |
> - (XY_FAST_COLOR_BLT_DW - 2);
> + spl_mode | (XY_FAST_COLOR_BLT_DW - 2);
> *cs++ = FIELD_PREP(XY_FAST_COLOR_BLT_MOCS_MASK, mocs)
> |
> - (PAGE_SIZE - 1);
> + (PAGE_SIZE - 1) | aux;
> *cs++ = 0;
> *cs++ = size >> PAGE_SHIFT << 16 | PAGE_SIZE / 4;
> *cs++ = lower_32_bits(offset);
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