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_CTRL_SURF_COPY_BLT is a BLT cmd used for reading and writing the ccs surface of a lmem memory. So on Flat-CCS capable platform we use XY_CTRL_SURF_COPY_BLT to clear the CCS meta data.
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] v8: XY_CTRL_SURF_COPY_BLT for ccs clearing.
Signed-off-by: Ramalingam C ramalingam.c@intel.com Signed-off-by: Ayaz A Siddiqui ayaz.siddiqui@intel.com --- drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 15 ++ drivers/gpu/drm/i915/gt/intel_migrate.c | 138 ++++++++++++++++++- 2 files changed, 150 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..6b4eb7927ec7 100644 --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h @@ -153,8 +153,10 @@ #define MI_FLUSH_DW_PROTECTED_MEM_EN (1 << 22) #define MI_FLUSH_DW_STORE_INDEX (1<<21) #define MI_INVALIDATE_TLB (1<<18) +#define MI_FLUSH_DW_CCS (1<<16) #define MI_FLUSH_DW_OP_STOREDW (1<<14) #define MI_FLUSH_DW_OP_MASK (3<<14) +#define MI_FLUSH_DW_LLC (1<<9) #define MI_FLUSH_DW_NOTIFY (1<<8) #define MI_INVALIDATE_BSD (1<<7) #define MI_FLUSH_DW_USE_GTT (1<<2) @@ -203,6 +205,19 @@ #define GFX_OP_DRAWRECT_INFO ((0x3<<29)|(0x1d<<24)|(0x80<<16)|(0x3)) #define GFX_OP_DRAWRECT_INFO_I965 ((0x7900<<16)|0x2)
+#define XY_CTRL_SURF_INSTR_SIZE 5 +#define MI_FLUSH_DW_SIZE 3 +#define XY_CTRL_SURF_COPY_BLT ((2 << 29) | (0x48 << 22) | 3) +#define SRC_ACCESS_TYPE_SHIFT 21 +#define DST_ACCESS_TYPE_SHIFT 20 +#define CCS_SIZE_MASK GENMASK(17, 8) +#define XY_CTRL_SURF_MOCS_MASK GENMASK(31, 25) +#define NUM_CCS_BYTES_PER_BLOCK 256 +#define NUM_BYTES_PER_CCS_BYTE 256 +#define NUM_CCS_BLKS_PER_XFER 1024 +#define INDIRECT_ACCESS 0 +#define DIRECT_ACCESS 1 + #define COLOR_BLT_CMD (2 << 29 | 0x40 << 22 | (5 - 2)) #define XY_COLOR_BLT_CMD (2 << 29 | 0x50 << 22) #define XY_FAST_COLOR_BLT_CMD (2 << 29 | 0x44 << 22) diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c index 73199ebf0671..c1db8daf994a 100644 --- a/drivers/gpu/drm/i915/gt/intel_migrate.c +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c @@ -16,7 +16,8 @@ struct insert_pte_data { };
#define CHUNK_SZ SZ_8M /* ~1ms at 8GiB/s preemption delay */ - +#define GET_CCS_BYTES(i915, size) (HAS_FLAT_CCS(i915) ? \ + DIV_ROUND_UP(size, NUM_BYTES_PER_CCS_BYTE) : 0) static bool engine_supports_migration(struct intel_engine_cs *engine) { if (!engine) @@ -467,6 +468,110 @@ 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 inline u32 *i915_flush_dw(u32 *cmd, u32 flags) +{ + *cmd++ = MI_FLUSH_DW | flags; + *cmd++ = 0; + *cmd++ = 0; + + return cmd; +} + +static u32 calc_ctrl_surf_instr_size(struct drm_i915_private *i915, int size) +{ + u32 num_cmds, num_blks, total_size; + + if (!GET_CCS_BYTES(i915, size)) + return 0; + + /* + * XY_CTRL_SURF_COPY_BLT transfers CCS in 256 byte + * blocks. one XY_CTRL_SURF_COPY_BLT command can + * transfer upto 1024 blocks. + */ + num_blks = DIV_ROUND_UP(GET_CCS_BYTES(i915, size), + NUM_CCS_BYTES_PER_BLOCK); + num_cmds = DIV_ROUND_UP(num_blks, NUM_CCS_BLKS_PER_XFER); + total_size = XY_CTRL_SURF_INSTR_SIZE * num_cmds; + + /* + * Adding a flush before and after XY_CTRL_SURF_COPY_BLT + */ + total_size += 2 * MI_FLUSH_DW_SIZE; + + return total_size; +} + +static u32 *_i915_ctrl_surf_copy_blt(u32 *cmd, u64 src_addr, u64 dst_addr, + u8 src_mem_access, u8 dst_mem_access, + int src_mocs, int dst_mocs, + u32 ccs_blocks) +{ + /* + * The XY_CTRL_SURF_COPY_BLT instruction is used to copy the CCS + * data in and out of the CCS region. + * + * We can copy at most 1024 blocks of 256 bytes using one + * XY_CTRL_SURF_COPY_BLT instruction. + * + * In case we need to copy more than 1024 blocks, we need to add + * another instruction to the same batch buffer. + * + * 1024 blocks of 256 bytes of CCS represent a total 256KB of CCS. + * + * 256 KB of CCS represents 256 * 256 KB = 64 MB of LMEM. + */ + do { + int blks_per_copy; + + blks_per_copy = ccs_blocks >= NUM_CCS_BLKS_PER_XFER ? + NUM_CCS_BLKS_PER_XFER : ccs_blocks; + *cmd++ = XY_CTRL_SURF_COPY_BLT | + src_mem_access << SRC_ACCESS_TYPE_SHIFT | + dst_mem_access << DST_ACCESS_TYPE_SHIFT | + FIELD_PREP(CCS_SIZE_MASK, blks_per_copy - 1); + *cmd++ = lower_32_bits(src_addr); + *cmd++ = (upper_32_bits(src_addr) & 0xFFFF) | + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, src_mocs); + *cmd++ = lower_32_bits(dst_addr); + *cmd++ = (upper_32_bits(dst_addr) & 0xFFFF) | + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, dst_mocs); + src_addr += SZ_64M; + dst_addr += SZ_64M; + ccs_blocks -= blks_per_copy; + } while (ccs_blocks > 0); + + return cmd; +} + static int emit_copy(struct i915_request *rq, u32 dst_offset, u32 src_offset, int size) { @@ -618,8 +723,9 @@ static int emit_clear(struct i915_request *rq, u64 offset, int size, u32 value, bool is_lmem) { struct drm_i915_private *i915 = rq->engine->i915; - int mocs = rq->engine->gt->mocs.uc_index << 1; + u32 mocs = rq->engine->gt->mocs.uc_index << 1; const int ver = GRAPHICS_VER(i915); + u32 num_ccs_blks, ccs_ring_size = 0; int ring_sz; u32 *cs;
@@ -634,7 +740,12 @@ static int emit_clear(struct i915_request *rq, u64 offset, int size, else ring_sz = 6;
- cs = intel_ring_begin(rq, ring_sz); + /* Clear CCS only when value is 0 */ + ccs_ring_size = (HAS_FLAT_CCS(i915) && is_lmem && !value) ? + calc_ctrl_surf_instr_size(i915, size) : 0; + ring_sz += ccs_ring_size; + + cs = intel_ring_begin(rq, round_up(ring_sz, 2)); if (IS_ERR(cs)) return PTR_ERR(cs);
@@ -679,6 +790,27 @@ static int emit_clear(struct i915_request *rq, u64 offset, int size, *cs++ = value; }
+ if (ccs_ring_size) { + num_ccs_blks = DIV_ROUND_UP(GET_CCS_BYTES(i915, size), + NUM_CCS_BYTES_PER_BLOCK); + + /* + * Flat CCS surface can only be accessed via + * XY_CTRL_SURF_COPY_BLT CMD and using indirect + * mapping of associated LMEM. + * We can clear ccs surface by writing all 0s, + * so we will flush the previously cleared buffer + * and use it as a source. + */ + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); + cs = _i915_ctrl_surf_copy_blt(cs, offset, offset, + DIRECT_ACCESS, INDIRECT_ACCESS, + mocs, mocs, num_ccs_blks); + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); + } + if (ring_sz & 1) + *cs++ = MI_NOOP; + intel_ring_advance(rq, cs); return 0; }