From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f199.google.com (mail-qk0-f199.google.com [209.85.220.199]) by kanga.kvack.org (Postfix) with ESMTP id EE96A6B312F for ; Fri, 24 Aug 2018 15:25:55 -0400 (EDT) Received: by mail-qk0-f199.google.com with SMTP id d194-v6so8459871qkb.12 for ; Fri, 24 Aug 2018 12:25:55 -0700 (PDT) Received: from mx1.redhat.com (mx3-rdu2.redhat.com. [66.187.233.73]) by mx.google.com with ESMTPS id t28-v6si2188486qta.348.2018.08.24.12.25.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 24 Aug 2018 12:25:55 -0700 (PDT) From: jglisse@redhat.com Subject: [PATCH 5/7] mm/hmm: use a structure for update callback parameters Date: Fri, 24 Aug 2018 15:25:47 -0400 Message-Id: <20180824192549.30844-6-jglisse@redhat.com> In-Reply-To: <20180824192549.30844-1-jglisse@redhat.com> References: <20180824192549.30844-1-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Ralph Campbell , John Hubbard From: JA(C)rA'me Glisse Use a structure to gather all the parameters for the update callback. This make it easier when adding new parameters by avoiding having to update all callback function signature. Signed-off-by: JA(C)rA'me Glisse Cc: Ralph Campbell Cc: John Hubbard Cc: Andrew Morton --- include/linux/hmm.h | 25 +++++++++++++++++-------- mm/hmm.c | 27 ++++++++++++++------------- 2 files changed, 31 insertions(+), 21 deletions(-) diff --git a/include/linux/hmm.h b/include/linux/hmm.h index 1ff4bae7ada7..a7f7600b6bb0 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -274,13 +274,26 @@ static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range, struct hmm_mirror; /* - * enum hmm_update_type - type of update + * enum hmm_update_event - type of update * @HMM_UPDATE_INVALIDATE: invalidate range (no indication as to why) */ -enum hmm_update_type { +enum hmm_update_event { HMM_UPDATE_INVALIDATE, }; +/* + * struct hmm_update - HMM update informations for callback + * + * @start: virtual start address of the range to update + * @end: virtual end address of the range to update + * @event: event triggering the update (what is happening) + */ +struct hmm_update { + unsigned long start; + unsigned long end; + enum hmm_update_event event; +}; + /* * struct hmm_mirror_ops - HMM mirror device operations callback * @@ -300,9 +313,7 @@ struct hmm_mirror_ops { /* sync_cpu_device_pagetables() - synchronize page tables * * @mirror: pointer to struct hmm_mirror - * @update_type: type of update that occurred to the CPU page table - * @start: virtual start address of the range to update - * @end: virtual end address of the range to update + * @update: update informations (see struct hmm_update) * * This callback ultimately originates from mmu_notifiers when the CPU * page table is updated. The device driver must update its page table @@ -314,9 +325,7 @@ struct hmm_mirror_ops { * synchronous call. */ void (*sync_cpu_device_pagetables)(struct hmm_mirror *mirror, - enum hmm_update_type update_type, - unsigned long start, - unsigned long end); + const struct hmm_update *update); }; /* diff --git a/mm/hmm.c b/mm/hmm.c index 659efc9aada6..debd2f734ab5 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -127,9 +127,7 @@ void hmm_mm_destroy(struct mm_struct *mm) } static void hmm_invalidate_range(struct hmm *hmm, - enum hmm_update_type action, - unsigned long start, - unsigned long end) + const struct hmm_update *update) { struct hmm_mirror *mirror; struct hmm_range *range; @@ -138,21 +136,20 @@ static void hmm_invalidate_range(struct hmm *hmm, list_for_each_entry(range, &hmm->ranges, list) { unsigned long addr, idx, npages; - if (end < range->start || start >= range->end) + if (update->end < range->start || update->start >= range->end) continue; range->valid = false; - addr = max(start, range->start); + addr = max(update->start, range->start); idx = (addr - range->start) >> PAGE_SHIFT; - npages = (min(range->end, end) - addr) >> PAGE_SHIFT; + npages = (min(range->end, update->end) - addr) >> PAGE_SHIFT; memset(&range->pfns[idx], 0, sizeof(*range->pfns) * npages); } spin_unlock(&hmm->lock); down_read(&hmm->mirrors_sem); list_for_each_entry(mirror, &hmm->mirrors, list) - mirror->ops->sync_cpu_device_pagetables(mirror, action, - start, end); + mirror->ops->sync_cpu_device_pagetables(mirror, update); up_read(&hmm->mirrors_sem); } @@ -183,10 +180,10 @@ static void hmm_release(struct mmu_notifier *mn, struct mm_struct *mm) } static int hmm_invalidate_range_start(struct mmu_notifier *mn, - struct mm_struct *mm, - unsigned long start, - unsigned long end, - bool blockable) + struct mm_struct *mm, + unsigned long start, + unsigned long end, + bool blockable) { struct hmm *hmm = mm->hmm; @@ -202,11 +199,15 @@ static void hmm_invalidate_range_end(struct mmu_notifier *mn, unsigned long start, unsigned long end) { + struct hmm_update update; struct hmm *hmm = mm->hmm; VM_BUG_ON(!hmm); - hmm_invalidate_range(mm->hmm, HMM_UPDATE_INVALIDATE, start, end); + update.start = start; + update.end = end; + update.event = HMM_UPDATE_INVALIDATE; + hmm_invalidate_range(hmm, &update); } static const struct mmu_notifier_ops hmm_mmu_notifier_ops = { -- 2.17.1