| Message ID | 20220328190736.19697-5-ramalingam.c@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915/ttm: Evict and restore of compressed object | expand |
On 3/28/22 21:07, 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_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. > v9: emit_copy_ccs is used. > v10: ctrl_surf cmds are filled in caller itself. [Thomas] > only one ctrl surf cmd is used as size of lmem is <=8M [Thomas] > > Signed-off-by: Ramalingam C <ramalingam.c@intel.com> > Signed-off-by: Ayaz A Siddiqui <ayaz.siddiqui@intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> > --- > drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 16 +++ > drivers/gpu/drm/i915/gt/intel_migrate.c | 137 ++++++++++++++++++- > 2 files changed, 152 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h > index 925e55b6a94f..372ef4c3ce2a 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 +205,20 @@ > #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 0x3FF > +#define CCS_SIZE_SHIFT 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 ec9a9e7cb388..0657d33fedac 100644 > --- a/drivers/gpu/drm/i915/gt/intel_migrate.c > +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c > @@ -17,6 +17,8 @@ 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 +469,123 @@ 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 int emit_copy_ccs(struct i915_request *rq, > + u32 dst_offset, u8 dst_access, > + u32 src_offset, u8 src_access, int size) > +{ > + struct drm_i915_private *i915 = rq->engine->i915; > + int mocs = rq->engine->gt->mocs.uc_index << 1; > + u32 num_ccs_blks, ccs_ring_size; > + u32 *cs; > + > + ccs_ring_size = calc_ctrl_surf_instr_size(i915, size); > + WARN_ON(!ccs_ring_size); > + > + cs = intel_ring_begin(rq, round_up(ccs_ring_size, 2)); > + if (IS_ERR(cs)) > + return PTR_ERR(cs); > + > + num_ccs_blks = DIV_ROUND_UP(GET_CCS_BYTES(i915, size), > + NUM_CCS_BYTES_PER_BLOCK); > + GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER); > + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); > + > + /* > + * 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. > + */ > + *cs++ = XY_CTRL_SURF_COPY_BLT | > + src_access << SRC_ACCESS_TYPE_SHIFT | > + dst_access << DST_ACCESS_TYPE_SHIFT | > + ((num_ccs_blks - 1) & CCS_SIZE_MASK) << CCS_SIZE_SHIFT; > + *cs++ = src_offset; > + *cs++ = rq->engine->instance | > + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, mocs); > + *cs++ = dst_offset; > + *cs++ = rq->engine->instance | > + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, mocs); > + > + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); > + if (ccs_ring_size & 1) > + *cs++ = MI_NOOP; > + > + intel_ring_advance(rq, cs); > + > + return 0; > +} > + > static int emit_copy(struct i915_request *rq, > u32 dst_offset, u32 src_offset, int size) > { > @@ -687,6 +806,7 @@ intel_context_migrate_clear(struct intel_context *ce, > u32 value, > struct i915_request **out) > { > + struct drm_i915_private *i915 = ce->engine->i915; > struct sgt_dma it = sg_sgt(sg); > struct i915_request *rq; > u32 offset; > @@ -698,7 +818,7 @@ intel_context_migrate_clear(struct intel_context *ce, > GEM_BUG_ON(ce->ring->size < SZ_64K); > > offset = 0; > - if (HAS_64K_PAGES(ce->engine->i915) && is_lmem) > + if (HAS_64K_PAGES(i915) && is_lmem) > offset = CHUNK_SZ; > > do { > @@ -740,6 +860,21 @@ intel_context_migrate_clear(struct intel_context *ce, > goto out_rq; > > err = emit_clear(rq, offset, len, value, is_lmem); > + if (err) > + goto out_rq; > + > + if (HAS_FLAT_CCS(i915) && is_lmem && !value) { > + /* > + * copy the content of memory into corresponding > + * ccs surface > + */ > + err = emit_copy_ccs(rq, offset, INDIRECT_ACCESS, offset, > + DIRECT_ACCESS, len); > + if (err) > + goto out_rq; > + } > + > + err = rq->engine->emit_flush(rq, EMIT_INVALIDATE); > > /* Arbitration is re-enabled between requests. */ > out_rq:
diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h index 925e55b6a94f..372ef4c3ce2a 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 +205,20 @@ #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 0x3FF +#define CCS_SIZE_SHIFT 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 ec9a9e7cb388..0657d33fedac 100644 --- a/drivers/gpu/drm/i915/gt/intel_migrate.c +++ b/drivers/gpu/drm/i915/gt/intel_migrate.c @@ -17,6 +17,8 @@ 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 +469,123 @@ 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 int emit_copy_ccs(struct i915_request *rq, + u32 dst_offset, u8 dst_access, + u32 src_offset, u8 src_access, int size) +{ + struct drm_i915_private *i915 = rq->engine->i915; + int mocs = rq->engine->gt->mocs.uc_index << 1; + u32 num_ccs_blks, ccs_ring_size; + u32 *cs; + + ccs_ring_size = calc_ctrl_surf_instr_size(i915, size); + WARN_ON(!ccs_ring_size); + + cs = intel_ring_begin(rq, round_up(ccs_ring_size, 2)); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + num_ccs_blks = DIV_ROUND_UP(GET_CCS_BYTES(i915, size), + NUM_CCS_BYTES_PER_BLOCK); + GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER); + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); + + /* + * 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. + */ + *cs++ = XY_CTRL_SURF_COPY_BLT | + src_access << SRC_ACCESS_TYPE_SHIFT | + dst_access << DST_ACCESS_TYPE_SHIFT | + ((num_ccs_blks - 1) & CCS_SIZE_MASK) << CCS_SIZE_SHIFT; + *cs++ = src_offset; + *cs++ = rq->engine->instance | + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, mocs); + *cs++ = dst_offset; + *cs++ = rq->engine->instance | + FIELD_PREP(XY_CTRL_SURF_MOCS_MASK, mocs); + + cs = i915_flush_dw(cs, MI_FLUSH_DW_LLC | MI_FLUSH_DW_CCS); + if (ccs_ring_size & 1) + *cs++ = MI_NOOP; + + intel_ring_advance(rq, cs); + + return 0; +} + static int emit_copy(struct i915_request *rq, u32 dst_offset, u32 src_offset, int size) { @@ -687,6 +806,7 @@ intel_context_migrate_clear(struct intel_context *ce, u32 value, struct i915_request **out) { + struct drm_i915_private *i915 = ce->engine->i915; struct sgt_dma it = sg_sgt(sg); struct i915_request *rq; u32 offset; @@ -698,7 +818,7 @@ intel_context_migrate_clear(struct intel_context *ce, GEM_BUG_ON(ce->ring->size < SZ_64K); offset = 0; - if (HAS_64K_PAGES(ce->engine->i915) && is_lmem) + if (HAS_64K_PAGES(i915) && is_lmem) offset = CHUNK_SZ; do { @@ -740,6 +860,21 @@ intel_context_migrate_clear(struct intel_context *ce, goto out_rq; err = emit_clear(rq, offset, len, value, is_lmem); + if (err) + goto out_rq; + + if (HAS_FLAT_CCS(i915) && is_lmem && !value) { + /* + * copy the content of memory into corresponding + * ccs surface + */ + err = emit_copy_ccs(rq, offset, INDIRECT_ACCESS, offset, + DIRECT_ACCESS, len); + if (err) + goto out_rq; + } + + err = rq->engine->emit_flush(rq, EMIT_INVALIDATE); /* Arbitration is re-enabled between requests. */ out_rq:
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. v9: emit_copy_ccs is used. v10: ctrl_surf cmds are filled in caller itself. [Thomas] only one ctrl surf cmd is used as size of lmem is <=8M [Thomas] 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 | 16 +++ drivers/gpu/drm/i915/gt/intel_migrate.c | 137 ++++++++++++++++++- 2 files changed, 152 insertions(+), 1 deletion(-)