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[91.14.161.181]) by smtp.gmail.com with ESMTPSA id c8sm8208615wru.30.2021.09.20.03.13.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Sep 2021 03:13:43 -0700 (PDT) Subject: Re: [Intel-gfx] [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl To: Tvrtko Ursulin , linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org Cc: daniel@ffwll.ch References: <20210917123513.1106-1-christian.koenig@amd.com> <20210917123513.1106-14-christian.koenig@amd.com> <6fbaca09-ec51-c44e-708c-334ef8be8595@linux.intel.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <368e8495-f4de-cbb2-3584-e022a5937885@gmail.com> Date: Mon, 20 Sep 2021 12:13:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <6fbaca09-ec51-c44e-708c-334ef8be8595@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Am 20.09.21 um 10:45 schrieb Tvrtko Ursulin: > > On 17/09/2021 13:35, Christian König wrote: >> This makes the function much simpler since the complex >> retry logic is now handled else where. >> >> Signed-off-by: Christian König >> --- >>   drivers/gpu/drm/i915/gem/i915_gem_busy.c | 32 ++++++++---------------- >>   1 file changed, 11 insertions(+), 21 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c >> b/drivers/gpu/drm/i915/gem/i915_gem_busy.c >> index 6234e17259c1..b1cb7ba688da 100644 >> --- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c >> +++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c >> @@ -82,8 +82,8 @@ i915_gem_busy_ioctl(struct drm_device *dev, void >> *data, >>   { >>       struct drm_i915_gem_busy *args = data; >>       struct drm_i915_gem_object *obj; >> -    struct dma_resv_list *list; >> -    unsigned int seq; >> +    struct dma_resv_iter cursor; >> +    struct dma_fence *fence; >>       int err; >>         err = -ENOENT; >> @@ -109,27 +109,17 @@ i915_gem_busy_ioctl(struct drm_device *dev, >> void *data, >>        * to report the overall busyness. This is what the wait-ioctl >> does. >>        * >>        */ >> -retry: >> -    seq = raw_read_seqcount(&obj->base.resv->seq); >> - >> -    /* Translate the exclusive fence to the READ *and* WRITE engine */ >> -    args->busy = >> busy_check_writer(dma_resv_excl_fence(obj->base.resv)); >> - >> -    /* Translate shared fences to READ set of engines */ >> -    list = dma_resv_shared_list(obj->base.resv); >> -    if (list) { >> -        unsigned int shared_count = list->shared_count, i; >> - >> -        for (i = 0; i < shared_count; ++i) { >> -            struct dma_fence *fence = >> -                rcu_dereference(list->shared[i]); >> - >> +    args->busy = false; >> +    dma_resv_iter_begin(&cursor, obj->base.resv, true); >> +    dma_resv_for_each_fence_unlocked(&cursor, fence) { > > You did not agree with my suggestion to reset args->busy on restart > and so preserve current behaviour? No, I want to keep the restart behavior internally to the dma_resv object and as far as I can see it should not make a difference here. Regards, Christian. > > Regards, > > Tvrtko > >> +        if (dma_resv_iter_is_exclusive(&cursor)) >> +            /* Translate the exclusive fence to the READ *and* WRITE >> engine */ >> +            args->busy = busy_check_writer(fence); >> +        else >> +            /* Translate shared fences to READ set of engines */ >>               args->busy |= busy_check_reader(fence); >> -        } >>       } >> - >> -    if (args->busy && read_seqcount_retry(&obj->base.resv->seq, seq)) >> -        goto retry; >> +    dma_resv_iter_end(&cursor); >>         err = 0; >>   out: >>