[igt-dev] [PATCH i-g-t v3 2/3] lib/xe_spin: fixed duration xe_spin capability
Bernatowicz, Marcin
marcin.bernatowicz at linux.intel.com
Fri Sep 8 13:22:44 UTC 2023
On 9/8/2023 2:14 PM, Kamil Konieczny wrote:
> Hi Marcin,
>
> few nits from checkpatch.pl, see below.
Thanks, I'll send a next version with one additional patch for
checkpatch error in xe_spin_wait_started.
--
marcin
>
> On 2023-09-05 at 15:02:24 +0000, Marcin Bernatowicz wrote:
>> Extended spinner with fixed duration capability. It allows
>> to prepare fixed duration (ex. 10ms) workloads and take workloads/second
>> measurements, a handy utility for scheduling tests.
>>
>> v2: - added asserts in div64_u64_round_up, duration_to_ctx_ticks,
>> simplified loop_addr (Zbyszek)
>> - corrected patch title (Kamil)
>>
>> v3: - div64_u64_round_up assert on overflow (Kamil)
>> - enum indentation cleanup in xe_spin.c (Kamil)
>>
>> Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
>> ---
>> lib/xe/xe_spin.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++-
>> lib/xe/xe_spin.h | 8 +++-
>> 2 files changed, 103 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/xe/xe_spin.c b/lib/xe/xe_spin.c
>> index 27f837ef9..54ae2d3ac 100644
>> --- a/lib/xe/xe_spin.c
>> +++ b/lib/xe/xe_spin.c
>> @@ -16,6 +16,50 @@
>> #include "xe_ioctl.h"
>> #include "xe_spin.h"
>>
>> +static uint32_t read_timestamp_frequency(int fd, int gt_id)
>> +{
>> + struct xe_device *dev = xe_device_get(fd);
>> +
>> + igt_assert(dev && dev->gts && dev->gts->num_gt);
>> + igt_assert(gt_id >= 0 && gt_id <= dev->gts->num_gt);
>> +
>> + return dev->gts->gts[gt_id].clock_freq;
>> +}
>> +
>> +static uint64_t div64_u64_round_up(const uint64_t x, const uint64_t y)
>> +{
>> + igt_assert(y > 0);
>> + igt_assert_lte_u64(x, UINT64_MAX - (y - 1));
>> +
>> + return (x + y - 1) / y;
>> +}
>> +
>> +/**
>> + * duration_to_ctx_ticks:
>> + * @fd: opened device
>> + * @gt_id: tile id
>> + * @duration_ns: duration in nanoseconds to be converted to context timestamp ticks
>> + * @return: duration converted to context timestamp ticks.
>> + */
>> +uint32_t duration_to_ctx_ticks(int fd, int gt_id, uint64_t duration_ns)
>> +{
>> + uint32_t f = read_timestamp_frequency(fd, gt_id);
>> + uint64_t ctx_ticks = div64_u64_round_up(duration_ns * f, NSEC_PER_SEC);
>> +
>> + igt_assert_lt_u64(ctx_ticks, XE_SPIN_MAX_CTX_TICKS);
>> +
>> + return ctx_ticks;
>> +}
>> +
>> +#define MI_SRM_CS_MMIO (1 << 19)
>> +#define MI_LRI_CS_MMIO (1 << 19)
>> +#define MI_LRR_DST_CS_MMIO (1 << 19)
>> +#define MI_LRR_SRC_CS_MMIO (1 << 18)
>> +#define CTX_TIMESTAMP 0x3a8;
> ----------------------------- ^
> Remove it, s/;//
>
>> +#define CS_GPR(x) (0x600 + 8 * (x))
>> +
>> +enum { START_TS, NOW_TS };
>> +
>> /**
>> * xe_spin_init:
>> * @spin: pointer to mapped bo in which spinner code will be written
>> @@ -23,13 +67,28 @@
>> */
>> void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts)
>> {
>> - uint64_t loop_addr = opts->addr + offsetof(struct xe_spin, batch);
>> + uint64_t loop_addr;
>> uint64_t start_addr = opts->addr + offsetof(struct xe_spin, start);
>> uint64_t end_addr = opts->addr + offsetof(struct xe_spin, end);
>> + uint64_t ticks_delta_addr = opts->addr + offsetof(struct xe_spin, ticks_delta);
>> + uint64_t pad_addr = opts->addr + offsetof(struct xe_spin, pad);
>> int b = 0;
>>
>> spin->start = 0;
>> spin->end = 0xffffffff;
>> + spin->ticks_delta = 0;
>> +
>> + if (opts->ctx_ticks) {
>> + /* store start timestamp */
>> + spin->batch[b++] = MI_LOAD_REGISTER_IMM(1) | MI_LRI_CS_MMIO;
>> + spin->batch[b++] = CS_GPR(START_TS) + 4;
>> + spin->batch[b++] = 0;
>> + spin->batch[b++] = MI_LOAD_REGISTER_REG | MI_LRR_DST_CS_MMIO | MI_LRR_SRC_CS_MMIO;
>> + spin->batch[b++] = CTX_TIMESTAMP;
>> + spin->batch[b++] = CS_GPR(START_TS);
>> + }
>> +
>> + loop_addr = opts->addr + b * sizeof(uint32_t);
>>
>> spin->batch[b++] = MI_STORE_DWORD_IMM_GEN4;
>> spin->batch[b++] = start_addr;
>> @@ -39,6 +98,42 @@ void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts)
>> if (opts->preempt)
>> spin->batch[b++] = (0x5 << 23);
>>
>> + if (opts->ctx_ticks) {
>> + spin->batch[b++] = MI_LOAD_REGISTER_IMM(1) | MI_LRI_CS_MMIO;
>> + spin->batch[b++] = CS_GPR(NOW_TS) + 4;
>> + spin->batch[b++] = 0;
>> + spin->batch[b++] = MI_LOAD_REGISTER_REG | MI_LRR_DST_CS_MMIO | MI_LRR_SRC_CS_MMIO;
>> + spin->batch[b++] = CTX_TIMESTAMP;
>> + spin->batch[b++] = CS_GPR(NOW_TS);
>> +
>> + /* delta = now - start; inverted to match COND_BBE */
>> + spin->batch[b++] = MI_MATH(4);
>> + spin->batch[b++] = MI_MATH_LOAD(MI_MATH_REG_SRCA, MI_MATH_REG(NOW_TS));
>> + spin->batch[b++] = MI_MATH_LOAD(MI_MATH_REG_SRCB, MI_MATH_REG(START_TS));
>> + spin->batch[b++] = MI_MATH_SUB;
>> + spin->batch[b++] = MI_MATH_STOREINV(MI_MATH_REG(NOW_TS), MI_MATH_REG_ACCU);
>> +
>> + /* Save delta for reading by COND_BBE */
>> + spin->batch[b++] = MI_STORE_REGISTER_MEM | MI_SRM_CS_MMIO | 2;
>> + spin->batch[b++] = CS_GPR(NOW_TS);
>> + spin->batch[b++] = ticks_delta_addr;
>> + spin->batch[b++] = ticks_delta_addr >> 32;
>> +
>> + /* Delay between SRM and COND_BBE to post the writes */
>> + for (int n = 0; n < 8; n++) {
>> + spin->batch[b++] = MI_STORE_DWORD_IMM_GEN4;
>> + spin->batch[b++] = pad_addr;
>> + spin->batch[b++] = pad_addr >> 32;
>> + spin->batch[b++] = 0xc0ffee;
>> + }
>> +
>> + /* Break if delta [time elapsed] > ns */
>> + spin->batch[b++] = MI_COND_BATCH_BUFFER_END | MI_DO_COMPARE | 2;
>> + spin->batch[b++] = ~(opts->ctx_ticks);
>> + spin->batch[b++] = ticks_delta_addr;
>> + spin->batch[b++] = ticks_delta_addr >> 32;
>> + }
>> +
>> spin->batch[b++] = MI_COND_BATCH_BUFFER_END | MI_DO_COMPARE | 2;
>> spin->batch[b++] = 0;
>> spin->batch[b++] = end_addr;
>> diff --git a/lib/xe/xe_spin.h b/lib/xe/xe_spin.h
>> index 9f1d33294..f1abc1102 100644
>> --- a/lib/xe/xe_spin.h
>> +++ b/lib/xe/xe_spin.h
>> @@ -15,27 +15,33 @@
>> #include "xe_query.h"
>> #include "lib/igt_dummyload.h"
>>
>> +#define XE_SPIN_MAX_CTX_TICKS UINT32_MAX - 1000
> -------------------------------- ^^^^^^^^^^^^^^^^^
> Put in braces:
>
> #define XE_SPIN_MAX_CTX_TICKS (UINT32_MAX - 1000)
>
> Regards,
> Kamil
>
>> +
>> /** struct xe_spin_opts
>> *
>> * @addr: offset of spinner within vm
>> * @preempt: allow spinner to be preempted or not
>> + * @ctx_ticks: number of ticks after which spinner is stopped, applied if > 0
>> *
>> * Used to initialize struct xe_spin spinner behavior.
>> */
>> struct xe_spin_opts {
>> uint64_t addr;
>> bool preempt;
>> + uint32_t ctx_ticks;
>> };
>>
>> /* Mapped GPU object */
>> struct xe_spin {
>> - uint32_t batch[16];
>> + uint32_t batch[128];
>> uint64_t pad;
>> uint32_t start;
>> uint32_t end;
>> + uint32_t ticks_delta;
>> };
>>
>> igt_spin_t *xe_spin_create(int fd, const struct igt_spin_factory *opt);
>> +uint32_t duration_to_ctx_ticks(int fd, int gt_id, uint64_t ns);
>> void xe_spin_init(struct xe_spin *spin, struct xe_spin_opts *opts);
>>
>> #define xe_spin_init_opts(fd, ...) \
>> --
>> 2.30.2
>>
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