[PATCH v3] drm/i915: Consolidate TLB invalidation flow
Matt Roper
matthew.d.roper at intel.com
Mon Feb 13 18:44:19 UTC 2023
On Wed, Feb 01, 2023 at 04:51:46PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> As the logic for selecting the register and corresponsing values grew, the
> code become a bit unsightly. Consolidate by storing the required values at
> engine init time in the engine itself, and by doing so minimise the amount
> of invariant platform and engine checks during each and every TLB
> invalidation.
>
> v2:
> * Fail engine probe if TLB invlidations registers are unknown.
>
> v3:
> * Rebase.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Andrzej Hajda <andrzej.hajda at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Reviewed-by: Andrzej Hajda <andrzej.hajda at intel.com> # v1
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_engine_cs.c | 96 +++++++++++++
> drivers/gpu/drm/i915/gt/intel_engine_types.h | 15 ++
> drivers/gpu/drm/i915/gt/intel_gt.c | 138 +++----------------
> 3 files changed, 133 insertions(+), 116 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> index d4e29da74612..e430945743ec 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> @@ -9,6 +9,7 @@
>
> #include "gem/i915_gem_context.h"
> #include "gem/i915_gem_internal.h"
> +#include "gt/intel_gt_print.h"
> #include "gt/intel_gt_regs.h"
>
> #include "i915_cmd_parser.h"
> @@ -1143,12 +1144,107 @@ static int init_status_page(struct intel_engine_cs *engine)
> return ret;
> }
>
> +static int intel_engine_init_tlb_invalidation(struct intel_engine_cs *engine)
> +{
> + static const union intel_engine_tlb_inv_reg gen8_regs[] = {
> + [RENDER_CLASS].reg = GEN8_RTCR,
> + [VIDEO_DECODE_CLASS].reg = GEN8_M1TCR, /* , GEN8_M2TCR */
> + [VIDEO_ENHANCEMENT_CLASS].reg = GEN8_VTCR,
> + [COPY_ENGINE_CLASS].reg = GEN8_BTCR,
> + };
> + static const union intel_engine_tlb_inv_reg gen12_regs[] = {
> + [RENDER_CLASS].reg = GEN12_GFX_TLB_INV_CR,
> + [VIDEO_DECODE_CLASS].reg = GEN12_VD_TLB_INV_CR,
> + [VIDEO_ENHANCEMENT_CLASS].reg = GEN12_VE_TLB_INV_CR,
> + [COPY_ENGINE_CLASS].reg = GEN12_BLT_TLB_INV_CR,
> + [COMPUTE_CLASS].reg = GEN12_COMPCTX_TLB_INV_CR,
> + };
> + static const union intel_engine_tlb_inv_reg xehp_regs[] = {
> + [RENDER_CLASS].mcr_reg = XEHP_GFX_TLB_INV_CR,
> + [VIDEO_DECODE_CLASS].mcr_reg = XEHP_VD_TLB_INV_CR,
> + [VIDEO_ENHANCEMENT_CLASS].mcr_reg = XEHP_VE_TLB_INV_CR,
> + [COPY_ENGINE_CLASS].mcr_reg = XEHP_BLT_TLB_INV_CR,
> + [COMPUTE_CLASS].mcr_reg = XEHP_COMPCTX_TLB_INV_CR,
> + };
> + struct drm_i915_private *i915 = engine->i915;
> + const union intel_engine_tlb_inv_reg *regs;
> + union intel_engine_tlb_inv_reg reg;
> + unsigned int class = engine->class;
> + unsigned int num = 0;
> + u32 val;
> +
> + /*
> + * New platforms should not be added with catch-all-newer (>=)
> + * condition so that any later platform added triggers the below warning
> + * and in turn mandates a human cross-check of whether the invalidation
> + * flows have compatible semantics.
> + *
> + * For instance with the 11.00 -> 12.00 transition three out of five
> + * respective engine registers were moved to masked type. Then after the
> + * 12.00 -> 12.50 transition multi cast handling is required too.
> + */
> +
> + if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 50) ||
> + GRAPHICS_VER_FULL(i915) == IP_VER(12, 55)) {
> + regs = xehp_regs;
> + num = ARRAY_SIZE(xehp_regs);
> + } else if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 0) ||
> + GRAPHICS_VER_FULL(i915) == IP_VER(12, 10)) {
> + regs = gen12_regs;
> + num = ARRAY_SIZE(gen12_regs);
> + } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11) {
> + regs = gen8_regs;
> + num = ARRAY_SIZE(gen8_regs);
> + } else if (GRAPHICS_VER(i915) < 8) {
> + return 0;
> + }
> +
> + if (gt_WARN_ONCE(engine->gt, !num,
> + "Platform does not implement TLB invalidation!"))
> + return -ENODEV;
> +
> + if (gt_WARN_ON_ONCE(engine->gt,
> + class >= num ||
> + (!regs[class].reg.reg &&
> + !regs[class].mcr_reg.reg)))
> + return -ERANGE;
> +
> + reg = regs[class];
> +
> + if (GRAPHICS_VER(i915) == 8 && class == VIDEO_DECODE_CLASS) {
> + reg.reg.reg += 4 * engine->instance; /* GEN8_M2TCR */
> + val = 0;
> + } else {
> + val = engine->instance;
> + }
> +
> + val = BIT(val);
> +
> + engine->tlb_inv.mcr = regs == xehp_regs;
> + engine->tlb_inv.reg = reg;
> + engine->tlb_inv.done = val;
> +
> + if (GRAPHICS_VER(i915) >= 12 &&
> + (engine->class == VIDEO_DECODE_CLASS ||
> + engine->class == VIDEO_ENHANCEMENT_CLASS ||
> + engine->class == COMPUTE_CLASS))
> + engine->tlb_inv.request = _MASKED_BIT_ENABLE(val);
> + else
> + engine->tlb_inv.request = val;
> +
> + return 0;
> +}
> +
> static int engine_setup_common(struct intel_engine_cs *engine)
> {
> int err;
>
> init_llist_head(&engine->barrier_tasks);
>
> + err = intel_engine_init_tlb_invalidation(engine);
> + if (err)
> + return err;
> +
> err = init_status_page(engine);
> if (err)
> return err;
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> index 4fd54fb8810f..8c661fe89314 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> @@ -341,6 +341,19 @@ struct intel_engine_guc_stats {
> u64 start_gt_clk;
> };
>
> +union intel_engine_tlb_inv_reg {
> + i915_reg_t reg;
> + i915_mcr_reg_t mcr_reg;
> +};
> +
> +struct intel_engine_tlb_inv
> +{
> + bool mcr;
> + union intel_engine_tlb_inv_reg reg;
> + u32 request;
> + u32 done;
> +};
> +
> struct intel_engine_cs {
> struct drm_i915_private *i915;
> struct intel_gt *gt;
> @@ -372,6 +385,8 @@ struct intel_engine_cs {
> u32 context_size;
> u32 mmio_base;
>
> + struct intel_engine_tlb_inv tlb_inv;
> +
> /*
> * Some w/a require forcewake to be held (which prevents RC6) while
> * a particular engine is active. If so, we set fw_domain to which
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 001a7ec5b861..f7f271708fc7 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -982,35 +982,6 @@ void intel_gt_info_print(const struct intel_gt_info *info,
> intel_sseu_dump(&info->sseu, p);
> }
>
> -struct reg_and_bit {
> - union {
> - i915_reg_t reg;
> - i915_mcr_reg_t mcr_reg;
> - };
> - u32 bit;
> -};
> -
> -static struct reg_and_bit
> -get_reg_and_bit(const struct intel_engine_cs *engine, const bool gen8,
> - const i915_reg_t *regs, const unsigned int num)
> -{
> - const unsigned int class = engine->class;
> - struct reg_and_bit rb = { };
> -
> - if (gt_WARN_ON_ONCE(engine->gt, class >= num || !regs[class].reg))
> - return rb;
> -
> - rb.reg = regs[class];
> - if (gen8 && class == VIDEO_DECODE_CLASS)
> - rb.reg.reg += 4 * engine->instance; /* GEN8_M2TCR */
> - else
> - rb.bit = engine->instance;
> -
> - rb.bit = BIT(rb.bit);
> -
> - return rb;
> -}
> -
> /*
> * HW architecture suggest typical invalidation time at 40us,
> * with pessimistic cases up to 100us and a recommendation to
> @@ -1024,14 +995,20 @@ get_reg_and_bit(const struct intel_engine_cs *engine, const bool gen8,
> * but are now considered MCR registers. Since they exist within a GAM range,
> * the primary instance of the register rolls up the status from each unit.
> */
> -static int wait_for_invalidate(struct intel_gt *gt, struct reg_and_bit rb)
> +static int wait_for_invalidate(struct intel_engine_cs *engine)
> {
> - if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 50))
> - return intel_gt_mcr_wait_for_reg(gt, rb.mcr_reg, rb.bit, 0,
> + if (engine->tlb_inv.mcr)
> + return intel_gt_mcr_wait_for_reg(engine->gt,
> + engine->tlb_inv.reg.mcr_reg,
> + engine->tlb_inv.done,
> + 0,
> TLB_INVAL_TIMEOUT_US,
> TLB_INVAL_TIMEOUT_MS);
> else
> - return __intel_wait_for_register_fw(gt->uncore, rb.reg, rb.bit, 0,
> + return __intel_wait_for_register_fw(engine->gt->uncore,
> + engine->tlb_inv.reg.reg,
> + engine->tlb_inv.done,
> + 0,
> TLB_INVAL_TIMEOUT_US,
> TLB_INVAL_TIMEOUT_MS,
> NULL);
> @@ -1039,62 +1016,14 @@ static int wait_for_invalidate(struct intel_gt *gt, struct reg_and_bit rb)
>
> static void mmio_invalidate_full(struct intel_gt *gt)
> {
> - static const i915_reg_t gen8_regs[] = {
> - [RENDER_CLASS] = GEN8_RTCR,
> - [VIDEO_DECODE_CLASS] = GEN8_M1TCR, /* , GEN8_M2TCR */
> - [VIDEO_ENHANCEMENT_CLASS] = GEN8_VTCR,
> - [COPY_ENGINE_CLASS] = GEN8_BTCR,
> - };
> - static const i915_reg_t gen12_regs[] = {
> - [RENDER_CLASS] = GEN12_GFX_TLB_INV_CR,
> - [VIDEO_DECODE_CLASS] = GEN12_VD_TLB_INV_CR,
> - [VIDEO_ENHANCEMENT_CLASS] = GEN12_VE_TLB_INV_CR,
> - [COPY_ENGINE_CLASS] = GEN12_BLT_TLB_INV_CR,
> - [COMPUTE_CLASS] = GEN12_COMPCTX_TLB_INV_CR,
> - };
> - static const i915_mcr_reg_t xehp_regs[] = {
> - [RENDER_CLASS] = XEHP_GFX_TLB_INV_CR,
> - [VIDEO_DECODE_CLASS] = XEHP_VD_TLB_INV_CR,
> - [VIDEO_ENHANCEMENT_CLASS] = XEHP_VE_TLB_INV_CR,
> - [COPY_ENGINE_CLASS] = XEHP_BLT_TLB_INV_CR,
> - [COMPUTE_CLASS] = XEHP_COMPCTX_TLB_INV_CR,
> - };
> struct drm_i915_private *i915 = gt->i915;
> struct intel_uncore *uncore = gt->uncore;
> struct intel_engine_cs *engine;
> intel_engine_mask_t awake, tmp;
> enum intel_engine_id id;
> - const i915_reg_t *regs;
> - unsigned int num = 0;
> unsigned long flags;
>
> - /*
> - * New platforms should not be added with catch-all-newer (>=)
> - * condition so that any later platform added triggers the below warning
> - * and in turn mandates a human cross-check of whether the invalidation
> - * flows have compatible semantics.
> - *
> - * For instance with the 11.00 -> 12.00 transition three out of five
> - * respective engine registers were moved to masked type. Then after the
> - * 12.00 -> 12.50 transition multi cast handling is required too.
> - */
> -
> - if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 50) ||
> - GRAPHICS_VER_FULL(i915) == IP_VER(12, 55)) {
> - regs = NULL;
> - num = ARRAY_SIZE(xehp_regs);
> - } else if (GRAPHICS_VER_FULL(i915) == IP_VER(12, 0) ||
> - GRAPHICS_VER_FULL(i915) == IP_VER(12, 10)) {
> - regs = gen12_regs;
> - num = ARRAY_SIZE(gen12_regs);
> - } else if (GRAPHICS_VER(i915) >= 8 && GRAPHICS_VER(i915) <= 11) {
> - regs = gen8_regs;
> - num = ARRAY_SIZE(gen8_regs);
> - } else if (GRAPHICS_VER(i915) < 8) {
> - return;
> - }
> -
> - if (gt_WARN_ONCE(gt, !num, "Platform does not implement TLB invalidation!"))
> + if (GRAPHICS_VER(i915) < 8)
> return;
>
> intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
> @@ -1104,33 +1033,18 @@ static void mmio_invalidate_full(struct intel_gt *gt)
>
> awake = 0;
> for_each_engine(engine, gt, id) {
> - struct reg_and_bit rb;
> -
> if (!intel_engine_pm_is_awake(engine))
> continue;
>
> - if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
> - u32 val = BIT(engine->instance);
> -
> - if (engine->class == VIDEO_DECODE_CLASS ||
> - engine->class == VIDEO_ENHANCEMENT_CLASS ||
> - engine->class == COMPUTE_CLASS)
> - val = _MASKED_BIT_ENABLE(val);
> + if (engine->tlb_inv.mcr)
> intel_gt_mcr_multicast_write_fw(gt,
> - xehp_regs[engine->class],
> - val);
> - } else {
> - rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
> - if (!i915_mmio_reg_offset(rb.reg))
> - continue;
> -
> - if (GRAPHICS_VER(i915) == 12 && (engine->class == VIDEO_DECODE_CLASS ||
> - engine->class == VIDEO_ENHANCEMENT_CLASS ||
> - engine->class == COMPUTE_CLASS))
> - rb.bit = _MASKED_BIT_ENABLE(rb.bit);
> -
> - intel_uncore_write_fw(uncore, rb.reg, rb.bit);
> - }
> + engine->tlb_inv.reg.mcr_reg,
> + engine->tlb_inv.request);
> + else
> + intel_uncore_write_fw(uncore,
> + engine->tlb_inv.reg.reg,
> + engine->tlb_inv.request);
> +
> awake |= engine->mask;
> }
>
> @@ -1149,17 +1063,9 @@ static void mmio_invalidate_full(struct intel_gt *gt)
> intel_gt_mcr_unlock(gt, flags);
>
> for_each_engine_masked(engine, gt, awake, tmp) {
> - struct reg_and_bit rb;
> -
> - if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
> - rb.mcr_reg = xehp_regs[engine->class];
> - rb.bit = BIT(engine->instance);
> - } else {
> - rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
> - }
> -
> - if (wait_for_invalidate(gt, rb))
> - gt_err_ratelimited(gt, "%s TLB invalidation did not complete in %ums!\n",
> + if (wait_for_invalidate(engine))
> + gt_err_ratelimited(gt,
> + "%s TLB invalidation did not complete in %ums!\n",
> engine->name, TLB_INVAL_TIMEOUT_MS);
> }
>
> --
> 2.34.1
>
--
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation
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