[PATCH i-g-t 2/4] lib/gpgpu_shader: Add causing a read pagefault from the eu thread
Gwan-gyeong Mun
gwan-gyeong.mun at intel.com
Thu Nov 21 12:02:59 UTC 2024
On 11/18/24 3:08 PM, Hajda, Andrzej wrote:
> W dniu 15.11.2024 o 15:11, Gwan-gyeong Mun pisze:
>> Create a function that causing a read pagefault using the eu thread load
>> instruction. If the given ppgtt address points to an unallocated ppgtt
>> virtual address, this shader can cause a read pagefault.
>> To directly use a 64-bit address as an argument, use the
>> Untyped 2D Block Array Load Instruction.
>>
>> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
>> ---
>> lib/gpgpu_shader.c | 92 +++++++++++++++++++++++++++++++++++++
>> lib/gpgpu_shader.h | 1 +
>> lib/iga64_generated_codes.c | 21 ++++++++-
>> 3 files changed, 113 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/gpgpu_shader.c b/lib/gpgpu_shader.c
>> index 7a2f0d28d..d7c47be80 100644
>> --- a/lib/gpgpu_shader.c
>> +++ b/lib/gpgpu_shader.c
>> @@ -912,3 +912,95 @@ void
>> gpgpu_shader__end_system_routine_step_if_eq(struct gpgpu_shader *shdr,
>> ", 0x807fffff, /* leave breakpoint exception */
>> y_offset, value, 0x7fffff /* clear all exceptions */ );
>> }
>> +
>> +/**
>> + * gpgpu_shader__read_page_fault:
>> + * @shdr: shader to be modified
>> + * @ppgtt_addr: ppgtt virtual address to raise pagefault
>> + *
>> + * For a given arbitrary ppgtt virtual address, it raises a pagefault
>> using
>> + * the eu thread load instruction.
>> + */
>> +void gpgpu_shader__read_page_fault(struct gpgpu_shader *shdr,
>> uint64_t ppgtt_addr)
>> +{
>> + /* pagefault ppgtt virtual address */
>> + uint64_t addr = CANONICAL(ppgtt_addr);
>> +
>> + igt_assert_f((addr & 0x3) == 0, "address must be aligned to
>> DWord!\n");
>> +
>> + emit_iga64_code(shdr, read_page_fault, " \n\
>> +#if GEN_VER >= 2000 \n\
>> +// Unyped 2D Block Array Load \n\
>> +// Instruction_Load2DBlockArray \n\
>> +// bspec: 63972 \n\
>> +// src0 address payload (Untyped2DBLOCKAddressPayload) specifies
>> both \n\
>> +// the block parameters and the 2D Surface parameters. \n\
>> +// Untyped2DBLOCKAddressPayload \n\
>> +// bspec: 63986 \n\
>> +// [243:240] Array Length: 0 (length is 1) \n\
>> +// [239:232] Block Height: 0 (height is 1) \n\
>> +// [231:224] Block Width: 0xf (width is 16) \n\
>> +// [223:192] Block Start Y: 0 \n\
>> +// [191:160] Block Start X: 0 \n\
>> +// [159:128] Untyped 2D Surface Pitch: 0x3f (pitch is 64
>> bytes) \n\
>> +// [127:96] Untyped 2D Surface Height: 0 (height is 1)
>> \n\
>> +// [95:64] Untyped 2D Surface Width: 0x3f (width is 64
>> bytes) \n\
>> +// [63:0] Untyped 2D Surface Base Address \n\
>> +// initialize register \n\
>> +(W) mov (8) r30.0<1>:uq 0x0:uq \n\
>> +// [0:31] Untyped 2D Surface Base Address low \n\
>> +(W) mov (1) r30.0<1>:ud ARG(0):ud \n\
>> +// [32:63] Untyped 2D Surface Base Address high \n\
>> +(W) mov (1) r30.1<1>:ud ARG(1):ud \n\
>> +// [95:64] Untyped 2D Surface Width: 0x3f \n\
>> +// (Width minus 1 (in bytes) of the 2D surface, it represents
>> 64) \n\
>> +(W) mov (1) r30.2<1>:ud 0x3f:ud \n\
>> +// [127:96] Untyped 2D Surface Height: 0x0 \n\
>> +// (Height minus 1 (in number of data elements) of \n\
>> +// the Untyped 2D surface, it represents 1) \n\
>> +(W) mov (1) r30.3<1>:ud 0x0:ud \n\
>> +// [159:128] Untyped 2D Surface Pitch: 0x3f \n\
>> +// (Pitch minus 1 (in bytes) of the 2D surface, it represents
>> 64) \n\
>> +(W) mov (1) r30.4<1>:ud 0x3f:ud \n\
>> +// [231:224] Block Width: 0xf (15) \n\
>> +// (Specifies the width minus 1 (in number of data elements)
>> for this \n\
>> +// rectangular region, it represents 16) \n\
>> +// Block width (encoded_value + 1) must be a multiple of DW (4
>> bytes). \n\
>> +// [239:232] Block Height: 0 \n\
>> +// (Specifies the height minus 1 (in number of data elements)
>> for \n\
>> +// this rectangular region, it represents 1) \n\
>> +// [243:240] Array Length: 0 \n\
>> +// (Specifies Array Length minus 1 for Load2DBlockArray
>> messages, \n\
>> +// must be zero for 2D Block Store messages, it represents
>> 1) \n\
>> +(W) mov (1) r30.7<1>:ud 0xf:ud \n\
>
> It duplicates code from gpgpu_shader__write_offset, could be replaced
> with macros as in https://patchwork.freedesktop.org/series/141348/ , but
> no rush :)
>
Introducing macros will be done in another refactoring patch.
Thanks.
>> +// \n\
>> +// dest data payload format is selected by Data Size. \n\
>> +// Block Height x Block Width x Data size / GRF Register
>> size \n\
>> +// => 1 x 16 x 32bit / 512bit = 1 \n\
>> +// data payload format size is 1 GRF Register. \n\
>> +// \n\
>> +// send.ugm Untyped 2D Block Array Load \n\
>> +// Format: send.ugm (1) dst src0 src1 ExtMsg MsgDesc \n\
>> +// Execution Mask restriction: SIMT1 \n\
>> +// \n\
>> +// Extended Message Descriptor (Dataport Extended Descriptor Imm 2D
>> Block) \n\
>> +// bspec: 67780 \n\
>> +// 0x0 => \n\
>> +// [32:22] Global Y_offset: 0 \n\
>> +// [21:12] Global X_offset: 0 \n\
>> +// \n\
>> +// Message Descriptor \n\
>> +// bspec: 63972 \n\
>> +// 0x2128403 => \n\
>> +// [30:29] Address Type: 0 (FLAT) \n\
>> +// [28:25] Src0 Length: 1 \n\
>> +// [24:20] Dest Length: 1 \n\
>> +// [19:16] Cache : 2 (L1UC_L3UC) 10 \n\
>> +// [15] Transpose Block: 1 \n\
>> +// [11:9] Data Size: 2 (D32) 10 \n\
>> +// [7] VNNI Transform: 0 \n\
>> +// [5:0] Load Operation: 3 (Load 2D Block) 11 \n\
>> +(W) send.ugm (1) r31 r30 null 0x0 0x2128403 \n\
>> +#endif \n\
>> + ", lower_32_bits(addr), upper_32_bits(addr));
>> +}
>> \ No newline at end of file
>
> New line
>
>> diff --git a/lib/gpgpu_shader.h b/lib/gpgpu_shader.h
>> index 355b128b5..318550c52 100644
>> --- a/lib/gpgpu_shader.h
>> +++ b/lib/gpgpu_shader.h
>> @@ -87,6 +87,7 @@ void gpgpu_shader__write_offset(struct gpgpu_shader
>> *shdr, uint64_t ppgtt_offset
>> uint32_t value);
>> void gpgpu_shader__write_on_exception(struct gpgpu_shader *shdr,
>> uint32_t dw, uint32_t x_offset,
>> uint32_t y_offset, uint32_t mask, uint32_t
>> value);
>> +void gpgpu_shader__read_page_fault(struct gpgpu_shader *shdr,
>> uint64_t ppgtt_addr);
>> void gpgpu_shader__label(struct gpgpu_shader *shdr, int label_id);
>> void gpgpu_shader__jump(struct gpgpu_shader *shdr, int label_id);
>> void gpgpu_shader__jump_neq(struct gpgpu_shader *shdr, int label_id,
>> diff --git a/lib/iga64_generated_codes.c b/lib/iga64_generated_codes.c
>> index b23613ac4..53a705358 100644
>> --- a/lib/iga64_generated_codes.c
>> +++ b/lib/iga64_generated_codes.c
>> @@ -3,7 +3,7 @@
>> #include "gpgpu_shader.h"
>> -#define MD5_SUM_IGA64_ASMS 4fcde43dedb9d3212f1d85b5b180b0c1
>> +#define MD5_SUM_IGA64_ASMS 01290b5ecda7a6e765463558d6f59952
>> struct iga64_template const iga64_code_gpgpu_fill[] = {
>> { .gen_ver = 2000, .size = 44, .code = (const uint32_t []) {
>> @@ -79,6 +79,25 @@ struct iga64_template const iga64_code_gpgpu_fill[]
>> = {
>> }}
>> };
>> +struct iga64_template const iga64_code_read_page_fault[] = {
>> + { .gen_ver = 2000, .size = 44, .code = (const uint32_t []) {
>> + 0x800c0061, 0x1e054330, 0x00000000, 0x00000000,
>> + 0x80000061, 0x1e054220, 0x00000000, 0xc0ded000,
>> + 0x80000061, 0x1e154220, 0x00000000, 0xc0ded001,
>> + 0x80000061, 0x1e254220, 0x00000000, 0x0000003f,
>> + 0x80000061, 0x1e354220, 0x00000000, 0x00000000,
>> + 0x80000061, 0x1e454220, 0x00000000, 0x0000003f,
>> + 0x80000061, 0x1e754220, 0x00000000, 0x0000000f,
>> + 0x80032031, 0x1f0c0000, 0xf8061e0c, 0x00a00000,
>> + 0x80000001, 0x00010000, 0x20000000, 0x00000000,
>> + 0x80000001, 0x00010000, 0x30000000, 0x00000000,
>> + 0x80000901, 0x00010000, 0x00000000, 0x00000000,
>> + }},
>> + { .gen_ver = 0, .size = 0, .code = (const uint32_t []) {
>> +
>> + }}
>> +};
>> +
>> struct iga64_template const
>> iga64_code_end_system_routine_step_if_eq[] = {
>> { .gen_ver = 2000, .size = 44, .code = (const uint32_t []) {
>> 0x80000966, 0x80018220, 0x02008000, 0x00008000,
>
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