| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <51e82b3b-b023-75dd-a039-e2941b426f1f@linux.intel.com>
Date: Thu, 16 Jun 2022 08:21:17 +0100
From: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Chris Wilson <chris.p.wilson@...el.com>,
Fei Yang <fei.yang@...el.com>,
Michał Winiarski <michal.winiarski@...el.com>,
Thomas Hellstrom <thomas.hellstrom@...el.com>,
Thomas Hellström
<thomas.hellstrom@...ux.intel.com>,
Andi Shyti <andi.shyti@...ux.intel.com>,
Daniel Vetter <daniel@...ll.ch>,
Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
Dave Airlie <airlied@...hat.com>,
David Airlie <airlied@...ux.ie>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Jason Ekstrand <jason@...kstrand.net>,
John Harrison <John.C.Harrison@...el.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Lucas De Marchi <lucas.demarchi@...el.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Matt Roper <matthew.d.roper@...el.com>,
Matthew Auld <matthew.auld@...el.com>,
Matthew Brost <matthew.brost@...el.com>,
Ramalingam C <ramalingam.c@...el.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, mauro.chehab@...ux.intel.com,
stable@...r.kernel.org
Subject: Re: [PATCH 1/6] drm/i915/gt: Ignore TLB invalidations on idle engines
On 15/06/2022 16:27, Mauro Carvalho Chehab wrote:
> From: Chris Wilson <chris.p.wilson@...el.com>
>
> As an extension of the current skip TLB invalidations,
> check if the device is powered down prior to any engine activity,
>
> as, on such cases, all the TLBs were already invalidated, so an
> explicit TLB invalidation is not needed.
>
> This becomes more significant with GuC, as it can only do so when
> the connection to the GuC is awake.
>
> Fixes: 7938d61591d3 ("drm/i915: Flush TLBs before releasing backing store")
Hmmm is this a fix or "an extension" as the commit text mentions both
options?! GuC angle does not appear relevant for upstream yet so is cc:
stable really required is the question.
Regards,
Tvrtko
>
> Signed-off-by: Chris Wilson <chris.p.wilson@...el.com>
> Cc: Fei Yang <fei.yang@...el.com>
> Cc: Andi Shyti <andi.shyti@...ux.intel.com>
> Cc: stable@...r.kernel.org
> Acked-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
> ---
>
> See [PATCH 0/6] at: https://lore.kernel.org/all/cover.1655306128.git.mchehab@kernel.org/
>
> drivers/gpu/drm/i915/gem/i915_gem_pages.c | 10 +++++----
> drivers/gpu/drm/i915/gt/intel_gt.c | 26 +++++++++++++++++------
> drivers/gpu/drm/i915/gt/intel_gt_pm.h | 3 +++
> 3 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> index 97c820eee115..6835279943df 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
> @@ -6,14 +6,15 @@
>
> #include <drm/drm_cache.h>
>
> +#include "gt/intel_gt.h"
> +#include "gt/intel_gt_pm.h"
> +
> #include "i915_drv.h"
> #include "i915_gem_object.h"
> #include "i915_scatterlist.h"
> #include "i915_gem_lmem.h"
> #include "i915_gem_mman.h"
>
> -#include "gt/intel_gt.h"
> -
> void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
> struct sg_table *pages,
> unsigned int sg_page_sizes)
> @@ -217,10 +218,11 @@ __i915_gem_object_unset_pages(struct drm_i915_gem_object *obj)
>
> if (test_and_clear_bit(I915_BO_WAS_BOUND_BIT, &obj->flags)) {
> struct drm_i915_private *i915 = to_i915(obj->base.dev);
> + struct intel_gt *gt = to_gt(i915);
> intel_wakeref_t wakeref;
>
> - with_intel_runtime_pm_if_active(&i915->runtime_pm, wakeref)
> - intel_gt_invalidate_tlbs(to_gt(i915));
> + with_intel_gt_pm_if_awake(gt, wakeref)
> + intel_gt_invalidate_tlbs(gt);
> }
>
> return pages;
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index f33290358c51..d5ed6a6ac67c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -11,6 +11,7 @@
>
> #include "i915_drv.h"
> #include "intel_context.h"
> +#include "intel_engine_pm.h"
> #include "intel_engine_regs.h"
> #include "intel_gt.h"
> #include "intel_gt_buffer_pool.h"
> @@ -1216,6 +1217,7 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
> 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;
> @@ -1239,12 +1241,27 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
>
> GEM_TRACE("\n");
>
> - assert_rpm_wakelock_held(&i915->runtime_pm);
> -
> mutex_lock(>->tlb_invalidate_lock);
> intel_uncore_forcewake_get(uncore, FORCEWAKE_ALL);
>
> + awake = 0;
> for_each_engine(engine, gt, id) {
> + struct reg_and_bit rb;
> +
> + if (!intel_engine_pm_is_awake(engine))
> + continue;
> +
> + rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
> + if (!i915_mmio_reg_offset(rb.reg))
> + continue;
> +
> + intel_uncore_write_fw(uncore, rb.reg, rb.bit);
> + awake |= engine->mask;
> + }
> +
> + for_each_engine_masked(engine, gt, awake, tmp) {
> + struct reg_and_bit rb;
> +
> /*
> * HW architecture suggest typical invalidation time at 40us,
> * with pessimistic cases up to 100us and a recommendation to
> @@ -1252,13 +1269,8 @@ void intel_gt_invalidate_tlbs(struct intel_gt *gt)
> */
> const unsigned int timeout_us = 100;
> const unsigned int timeout_ms = 4;
> - struct reg_and_bit rb;
>
> rb = get_reg_and_bit(engine, regs == gen8_regs, regs, num);
> - if (!i915_mmio_reg_offset(rb.reg))
> - continue;
> -
> - intel_uncore_write_fw(uncore, rb.reg, rb.bit);
> if (__intel_wait_for_register_fw(uncore,
> rb.reg, rb.bit, 0,
> timeout_us, timeout_ms,
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.h b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
> index bc898df7a48c..a334787a4939 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_pm.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.h
> @@ -55,6 +55,9 @@ static inline void intel_gt_pm_might_put(struct intel_gt *gt)
> for (tmp = 1, intel_gt_pm_get(gt); tmp; \
> intel_gt_pm_put(gt), tmp = 0)
>
> +#define with_intel_gt_pm_if_awake(gt, wf) \
> + for (wf = intel_gt_pm_get_if_awake(gt); wf; intel_gt_pm_put_async(gt), wf = 0)
> +
> static inline int intel_gt_pm_wait_for_idle(struct intel_gt *gt)
> {
> return intel_wakeref_wait_for_idle(>->wakeref);
Powered by blists - more mailing lists