On 29-11-2022 15:41, Tvrtko Ursulin wrote:
>
> On 22/11/2022 07:01, Aravind Iddamsetty wrote:
>> On XE_LPM+ platforms the media engines are carved out into a separate
>> GT but have a common GGTMMADR address range which essentially makes
>> the GGTT address space to be shared between media and render GT. As a
>> result any updates in GGTT shall invalidate TLB of GTs sharing it and
>> similarly any operation on GGTT requiring an action on a GT will have to
>> involve all GTs sharing it. setup_private_pat was being done on a per
>> GGTT based as that doesn't touch any GGTT structures moved it to per GT
>> based.
>>
>> BSPEC: 63834
>>
>> v2:
>> 1. Add details to commit msg
>> 2. includes fix for failure to add item to ggtt->gt_list, as suggested
>> by Lucas
>> 3. as ggtt_flush() is used only for ggtt drop i915_is_ggtt check within
>> it.
>> 4. setup_private_pat moved out of intel_gt_tiles_init
>>
>> v3:
>> 1. Move out for_each_gt from i915_driver.c (Jani Nikula)
>>
>> v4: drop using RCU primitives on ggtt->gt_list as it is not an RCU list
>> (Matt Roper)
>>
>> Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
>> Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/i915/gt/intel_ggtt.c | 54 +++++++++++++++++------
>> drivers/gpu/drm/i915/gt/intel_gt.c | 13 +++++-
>> drivers/gpu/drm/i915/gt/intel_gt_types.h | 3 ++
>> drivers/gpu/drm/i915/gt/intel_gtt.h | 4 ++
>> drivers/gpu/drm/i915/i915_driver.c | 12 ++---
>> drivers/gpu/drm/i915/i915_gem.c | 2 +
>> drivers/gpu/drm/i915/i915_gem_evict.c | 51 +++++++++++++++------
>> drivers/gpu/drm/i915/i915_vma.c | 5 ++-
>> drivers/gpu/drm/i915/selftests/i915_gem.c | 2 +
>> 9 files changed, 111 insertions(+), 35 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c
>> b/drivers/gpu/drm/i915/gt/intel_ggtt.c
>> index 8145851ad23d..7644738b9cdb 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
>> +++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
>> @@ -8,6 +8,7 @@
>> #include <linux/types.h>
>> #include <linux/stop_machine.h>
>> +#include <drm/drm_managed.h>
>> #include <drm/i915_drm.h>
>> #include <drm/intel-gtt.h>
>> @@ -196,10 +197,13 @@ void i915_ggtt_suspend_vm(struct
>> i915_address_space *vm)
>> void i915_ggtt_suspend(struct i915_ggtt *ggtt)
>> {
>> + struct intel_gt *gt;
>> +
>> i915_ggtt_suspend_vm(&ggtt->vm);
>> ggtt->invalidate(ggtt);
>> - intel_gt_check_and_clear_faults(ggtt->vm.gt);
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + intel_gt_check_and_clear_faults(gt);
>> }
>> void gen6_ggtt_invalidate(struct i915_ggtt *ggtt)
>> @@ -225,16 +229,21 @@ static void gen8_ggtt_invalidate(struct
>> i915_ggtt *ggtt)
>> static void guc_ggtt_invalidate(struct i915_ggtt *ggtt)
>> {
>> - struct intel_uncore *uncore = ggtt->vm.gt->uncore;
>> struct drm_i915_private *i915 = ggtt->vm.i915;
>> gen8_ggtt_invalidate(ggtt);
>> - if (GRAPHICS_VER(i915) >= 12)
>> - intel_uncore_write_fw(uncore, GEN12_GUC_TLB_INV_CR,
>> - GEN12_GUC_TLB_INV_CR_INVALIDATE);
>> - else
>> - intel_uncore_write_fw(uncore, GEN8_GTCR, GEN8_GTCR_INVALIDATE);
>> + if (GRAPHICS_VER(i915) >= 12) {
>> + struct intel_gt *gt;
>> +
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + intel_uncore_write_fw(gt->uncore,
>> + GEN12_GUC_TLB_INV_CR,
>> + GEN12_GUC_TLB_INV_CR_INVALIDATE);
>> + } else {
>> + intel_uncore_write_fw(ggtt->vm.gt->uncore,
>> + GEN8_GTCR, GEN8_GTCR_INVALIDATE);
>> + }
>> }
>> u64 gen8_ggtt_pte_encode(dma_addr_t addr,
>> @@ -986,8 +995,6 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
>> ggtt->vm.pte_encode = gen8_ggtt_pte_encode;
>> - setup_private_pat(ggtt->vm.gt);
>> -
>> return ggtt_probe_common(ggtt, size);
>> }
>> @@ -1196,7 +1203,14 @@ static int ggtt_probe_hw(struct i915_ggtt
>> *ggtt, struct intel_gt *gt)
>> */
>> int i915_ggtt_probe_hw(struct drm_i915_private *i915)
>> {
>> - int ret;
>> + struct intel_gt *gt;
>> + int ret, i;
>> +
>> + for_each_gt(gt, i915, i) {
>> + ret = intel_gt_assign_ggtt(gt);
>> + if (ret)
>> + return ret;
>> + }
>> ret = ggtt_probe_hw(to_gt(i915)->ggtt, to_gt(i915));
>> if (ret)
>> @@ -1208,6 +1222,19 @@ int i915_ggtt_probe_hw(struct drm_i915_private
>> *i915)
>> return 0;
>> }
>> +struct i915_ggtt *i915_ggtt_create(struct drm_i915_private *i915)
>> +{
>> + struct i915_ggtt *ggtt;
>> +
>> + ggtt = drmm_kzalloc(&i915->drm, sizeof(*ggtt), GFP_KERNEL);
>> + if (!ggtt)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + INIT_LIST_HEAD(&ggtt->gt_list);
>> +
>> + return ggtt;
>> +}
>> +
>> int i915_ggtt_enable_hw(struct drm_i915_private *i915)
>> {
>> if (GRAPHICS_VER(i915) < 6)
>> @@ -1296,9 +1323,11 @@ bool i915_ggtt_resume_vm(struct
>> i915_address_space *vm)
>> void i915_ggtt_resume(struct i915_ggtt *ggtt)
>> {
>> + struct intel_gt *gt;
>> bool flush;
>> - intel_gt_check_and_clear_faults(ggtt->vm.gt);
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + intel_gt_check_and_clear_faults(gt);
>> flush = i915_ggtt_resume_vm(&ggtt->vm);
>> @@ -1307,9 +1336,6 @@ void i915_ggtt_resume(struct i915_ggtt *ggtt)
>> if (flush)
>> wbinvd_on_all_cpus();
>> - if (GRAPHICS_VER(ggtt->vm.i915) >= 8)
>> - setup_private_pat(ggtt->vm.gt);
>
> Moving this really should have been a separate patch.
>
>> -
>> intel_ggtt_restore_fences(ggtt);
>> }
>> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c
>> b/drivers/gpu/drm/i915/gt/intel_gt.c
>> index b5ad9caa5537..b03788d7674e 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
>> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
>> @@ -110,9 +110,18 @@ static int intel_gt_probe_lmem(struct intel_gt *gt)
>> int intel_gt_assign_ggtt(struct intel_gt *gt)
>> {
>> - gt->ggtt = drmm_kzalloc(>->i915->drm, sizeof(*gt->ggtt),
>> GFP_KERNEL);
>> + /* Media GT shares primary GT's GGTT */
>> + if (gt->type == GT_MEDIA) {
>> + gt->ggtt = to_gt(gt->i915)->ggtt;
>
> AFAICT this creates two implicit assumptions: 1) That for_each_gt
> iterates in a certain order (primary always first), when it is calling
> in here; and 2) That the primary tile is not media. Ideally a
> GEM_BUG_ON(!gt->ggtt) would cover for it, since I am not sure the
> list_add_tail below is guaranteed to explode or not.
Ok makes sense.
>
>> + } else {
>> + gt->ggtt = i915_ggtt_create(gt->i915);
>> + if (IS_ERR(gt->ggtt))
>> + return PTR_ERR(gt->ggtt);
>> + }
>> - return gt->ggtt ? 0 : -ENOMEM;
>> + list_add_tail(>->ggtt_link, >->ggtt->gt_list);
>> +
>> + return 0;
>> }
>> int intel_gt_init_mmio(struct intel_gt *gt)
>> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h
>> b/drivers/gpu/drm/i915/gt/intel_gt_types.h
>> index c1d9cd255e06..8d915640914b 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
>> +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
>> @@ -277,6 +277,9 @@ struct intel_gt {
>> struct kobject *sysfs_defaults;
>> struct i915_perf_gt perf;
>> +
>> + /** link: &ggtt.gt_list */
>> + struct list_head ggtt_link;
>> };
>> struct intel_gt_definition {
>> diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h
>> b/drivers/gpu/drm/i915/gt/intel_gtt.h
>> index 4d75ba4bb41d..d1900fec6cd1 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_gtt.h
>> +++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
>> @@ -390,6 +390,9 @@ struct i915_ggtt {
>> struct mutex error_mutex;
>> struct drm_mm_node error_capture;
>> struct drm_mm_node uc_fw;
>> +
>> + /** List of GTs mapping this GGTT */
>> + struct list_head gt_list;
>> };
>> struct i915_ppgtt {
>> @@ -584,6 +587,7 @@ void i915_ggtt_disable_guc(struct i915_ggtt *ggtt);
>> int i915_init_ggtt(struct drm_i915_private *i915);
>> void i915_ggtt_driver_release(struct drm_i915_private *i915);
>> void i915_ggtt_driver_late_release(struct drm_i915_private *i915);
>> +struct i915_ggtt *i915_ggtt_create(struct drm_i915_private *i915);
>> static inline bool i915_ggtt_has_aperture(const struct i915_ggtt
>> *ggtt)
>> {
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c
>> b/drivers/gpu/drm/i915/i915_driver.c
>> index 69103ae37779..4e1bb3c23c63 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -612,10 +612,6 @@ static int i915_driver_hw_probe(struct
>> drm_i915_private *dev_priv)
>> i915_perf_init(dev_priv);
>> - ret = intel_gt_assign_ggtt(to_gt(dev_priv));
>> - if (ret)
>> - goto err_perf;
>> -
>> ret = i915_ggtt_probe_hw(dev_priv);
>> if (ret)
>> goto err_perf;
>> @@ -1316,7 +1312,8 @@ int i915_driver_suspend_switcheroo(struct
>> drm_i915_private *i915,
>> static int i915_drm_resume(struct drm_device *dev)
>> {
>> struct drm_i915_private *dev_priv = to_i915(dev);
>> - int ret;
>> + struct intel_gt *gt;
>> + int ret, i;
>> disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
>> @@ -1331,6 +1328,11 @@ static int i915_drm_resume(struct drm_device
>> *dev)
>> drm_err(&dev_priv->drm, "failed to re-enable GGTT\n");
>> i915_ggtt_resume(to_gt(dev_priv)->ggtt);
>> +
>> + for_each_gt(gt, dev_priv, i)
>> + if (GRAPHICS_VER(gt->i915) >= 8)
>> + setup_private_pat(gt);
>
> If this is now called from i915_driver.c, the >= 8 check should probably
> go into setup_private_pat. And exported function renamed to
> intel_gt_setup_private_pat. Otherwise it feels like top level code has a
> little bit of too much deep knowledge of things.
got it.
>
>> +
>> /* Must be called after GGTT is resumed. */
>> intel_dpt_resume(dev_priv);
>> diff --git a/drivers/gpu/drm/i915/i915_gem.c
>> b/drivers/gpu/drm/i915/i915_gem.c
>> index 8468ca9885fd..086c4702e1bf 100644
>> --- a/drivers/gpu/drm/i915/i915_gem.c
>> +++ b/drivers/gpu/drm/i915/i915_gem.c
>> @@ -1143,6 +1143,8 @@ int i915_gem_init(struct drm_i915_private
>> *dev_priv)
>> for_each_gt(gt, dev_priv, i) {
>> intel_uc_fetch_firmwares(>->uc);
>> intel_wopcm_init(>->wopcm);
>> + if (GRAPHICS_VER(dev_priv) >= 8)
>> + setup_private_pat(gt);
>> }
>> ret = i915_init_ggtt(dev_priv);
>> diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c
>> b/drivers/gpu/drm/i915/i915_gem_evict.c
>> index f025ee4fa526..4cfe36b0366b 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_evict.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_evict.c
>> @@ -43,16 +43,25 @@ static bool dying_vma(struct i915_vma *vma)
>> return !kref_read(&vma->obj->base.refcount);
>> }
>> -static int ggtt_flush(struct intel_gt *gt)
>> +static int ggtt_flush(struct i915_address_space *vm)
>> {
>> - /*
>> - * Not everything in the GGTT is tracked via vma (otherwise we
>> - * could evict as required with minimal stalling) so we are forced
>> - * to idle the GPU and explicitly retire outstanding requests in
>> - * the hopes that we can then remove contexts and the like only
>> - * bound by their active reference.
>> - */
>> - return intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
>> + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
>> + struct intel_gt *gt;
>> + int ret = 0;
>> +
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link) {
>> + /*
>> + * Not everything in the GGTT is tracked via vma (otherwise we
>> + * could evict as required with minimal stalling) so we are
>> forced
>> + * to idle the GPU and explicitly retire outstanding requests in
>> + * the hopes that we can then remove contexts and the like only
>> + * bound by their active reference.
>> + */
>> + ret = intel_gt_wait_for_idle(gt, MAX_SCHEDULE_TIMEOUT);
>> + if (ret)
>> + return ret;
>> + }
>> + return ret;
>> }
>> static bool grab_vma(struct i915_vma *vma, struct i915_gem_ww_ctx
>> *ww)
>> @@ -149,6 +158,7 @@ i915_gem_evict_something(struct i915_address_space
>> *vm,
>> struct drm_mm_node *node;
>> enum drm_mm_insert_mode mode;
>> struct i915_vma *active;
>> + struct intel_gt *gt;
>
> Declare where it is used, like in i915_gem_evict_for_node? Or maybe add
> a local helper like vm_retire_requests, not sure?
sure.
Thanks for your review Tvrtko, I would be doing these changes a little
later. Hope it should be fine.
Thanks,
Aravind.
>
> Regards,
>
> Tvrtko
>
>> int ret;
>> lockdep_assert_held(&vm->mutex);
>> @@ -174,7 +184,14 @@ i915_gem_evict_something(struct
>> i915_address_space *vm,
>> min_size, alignment, color,
>> start, end, mode);
>> - intel_gt_retire_requests(vm->gt);
>> + if (i915_is_ggtt(vm)) {
>> + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
>> +
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + intel_gt_retire_requests(gt);
>> + } else {
>> + intel_gt_retire_requests(vm->gt);
>> + }
>> search_again:
>> active = NULL;
>> @@ -246,7 +263,7 @@ i915_gem_evict_something(struct i915_address_space
>> *vm,
>> if (I915_SELFTEST_ONLY(igt_evict_ctl.fail_if_busy))
>> return -EBUSY;
>> - ret = ggtt_flush(vm->gt);
>> + ret = ggtt_flush(vm);
>> if (ret)
>> return ret;
>> @@ -332,7 +349,15 @@ int i915_gem_evict_for_node(struct
>> i915_address_space *vm,
>> * a stray pin (preventing eviction) that can only be resolved by
>> * retiring.
>> */
>> - intel_gt_retire_requests(vm->gt);
>> + if (i915_is_ggtt(vm)) {
>> + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
>> + struct intel_gt *gt;
>> +
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + intel_gt_retire_requests(gt);
>> + } else {
>> + intel_gt_retire_requests(vm->gt);
>> + }
>> if (i915_vm_has_cache_coloring(vm)) {
>> /* Expand search to cover neighbouring guard pages (or
>> lack!) */
>> @@ -438,7 +463,7 @@ int i915_gem_evict_vm(struct i915_address_space
>> *vm, struct i915_gem_ww_ctx *ww)
>> * switch otherwise is ineffective.
>> */
>> if (i915_is_ggtt(vm)) {
>> - ret = ggtt_flush(vm->gt);
>> + ret = ggtt_flush(vm);
>> if (ret)
>> return ret;
>> }
>> diff --git a/drivers/gpu/drm/i915/i915_vma.c
>> b/drivers/gpu/drm/i915/i915_vma.c
>> index 703fee6b5f75..726705b10637 100644
>> --- a/drivers/gpu/drm/i915/i915_vma.c
>> +++ b/drivers/gpu/drm/i915/i915_vma.c
>> @@ -1544,6 +1544,8 @@ static int __i915_ggtt_pin(struct i915_vma *vma,
>> struct i915_gem_ww_ctx *ww,
>> u32 align, unsigned int flags)
>> {
>> struct i915_address_space *vm = vma->vm;
>> + struct intel_gt *gt;
>> + struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
>> int err;
>> do {
>> @@ -1559,7 +1561,8 @@ static int __i915_ggtt_pin(struct i915_vma *vma,
>> struct i915_gem_ww_ctx *ww,
>> }
>> /* Unlike i915_vma_pin, we don't take no for an answer! */
>> - flush_idle_contexts(vm->gt);
>> + list_for_each_entry(gt, &ggtt->gt_list, ggtt_link)
>> + flush_idle_contexts(gt);
>> if (mutex_lock_interruptible(&vm->mutex) == 0) {
>> /*
>> * We pass NULL ww here, as we don't want to unbind
>> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem.c
>> b/drivers/gpu/drm/i915/selftests/i915_gem.c
>> index e5dd82e7e480..2535b9684bd1 100644
>> --- a/drivers/gpu/drm/i915/selftests/i915_gem.c
>> +++ b/drivers/gpu/drm/i915/selftests/i915_gem.c
>> @@ -127,6 +127,8 @@ static void igt_pm_resume(struct drm_i915_private
>> *i915)
>> */
>> with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
>> i915_ggtt_resume(to_gt(i915)->ggtt);
>> + if (GRAPHICS_VER(i915) >= 8)
>> + setup_private_pat(to_gt(i915));
>> i915_gem_resume(i915);
>> }
>> }
