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(unknown [IPv6:2a01:e0a:5e3:6100:826d:bc07:e98c:84a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: loicmolinari) by bali.collaboradmins.com (Postfix) with ESMTPSA id 2CEA717E1416; Mon, 10 Nov 2025 16:50:15 +0100 (CET) From: =?UTF-8?q?Lo=C3=AFc=20Molinari?= To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Boris Brezillon , Rob Herring , Steven Price , Liviu Dudau , Melissa Wen , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Hugh Dickins , Baolin Wang , Andrew Morton , =?UTF-8?q?Lo=C3=AFc=20Molinari?= , Al Viro , =?UTF-8?q?Miko=C5=82aj=20Wasiak?= , Christian Brauner , Nitin Gote , Andi Shyti , Jonathan Corbet , Christopher Healy , Matthew Wilcox , Bagas Sanjaya Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, kernel@collabora.com Subject: [PATCH v7 09/11] drm/panthor: Improve IOMMU map/unmap debugging logs Date: Mon, 10 Nov 2025 16:49:57 +0100 Message-ID: <20251110155000.2936-10-loic.molinari@collabora.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251110155000.2936-1-loic.molinari@collabora.com> References: <20251110155000.2936-1-loic.molinari@collabora.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Log the number of pages and their sizes actually mapped/unmapped by the IOMMU page table driver. Since a map/unmap op is often split in several ops depending on the underlying scatter/gather table, add the start address and the total size to the debugging logs in order to help understand which batch an op is part of. Signed-off-by: Lo=C3=AFc Molinari Reviewed-by: Boris Brezillon --- drivers/gpu/drm/panthor/panthor_mmu.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/pantho= r/panthor_mmu.c index 58fead90533a..32410713c61c 100644 --- a/drivers/gpu/drm/panthor/panthor_mmu.c +++ b/drivers/gpu/drm/panthor/panthor_mmu.c @@ -918,10 +918,9 @@ static int panthor_vm_unmap_pages(struct panthor_vm *v= m, u64 iova, u64 size) { struct panthor_device *ptdev =3D vm->ptdev; struct io_pgtable_ops *ops =3D vm->pgtbl_ops; + u64 start_iova =3D iova; u64 offset =3D 0; =20 - drm_dbg(&ptdev->base, "unmap: as=3D%d, iova=3D%llx, len=3D%llx", vm->as.i= d, iova, size); - while (offset < size) { size_t unmapped_sz =3D 0, pgcount; size_t pgsize =3D get_pgsize(iova + offset, size - offset, &pgcount); @@ -936,6 +935,12 @@ static int panthor_vm_unmap_pages(struct panthor_vm *v= m, u64 iova, u64 size) panthor_vm_flush_range(vm, iova, offset + unmapped_sz); return -EINVAL; } + + drm_dbg(&ptdev->base, + "unmap: as=3D%d, iova=3D0x%llx, sz=3D%llu, va=3D0x%llx, pgcnt=3D%zu, pg= sz=3D%zu", + vm->as.id, start_iova, size, iova + offset, + unmapped_sz / pgsize, pgsize); + offset +=3D unmapped_sz; } =20 @@ -951,6 +956,7 @@ panthor_vm_map_pages(struct panthor_vm *vm, u64 iova, i= nt prot, struct scatterlist *sgl; struct io_pgtable_ops *ops =3D vm->pgtbl_ops; u64 start_iova =3D iova; + u64 start_size =3D size; int ret; =20 if (!size) @@ -970,15 +976,18 @@ panthor_vm_map_pages(struct panthor_vm *vm, u64 iova,= int prot, len =3D min_t(size_t, len, size); size -=3D len; =20 - drm_dbg(&ptdev->base, "map: as=3D%d, iova=3D%llx, paddr=3D%pad, len=3D%z= x", - vm->as.id, iova, &paddr, len); - while (len) { size_t pgcount, mapped =3D 0; size_t pgsize =3D get_pgsize(iova | paddr, len, &pgcount); =20 ret =3D ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, GFP_KERNEL, &mapped); + + drm_dbg(&ptdev->base, + "map: as=3D%d, iova=3D0x%llx, sz=3D%llu, va=3D0x%llx, pa=3D%pad, pgcnt= =3D%zu, pgsz=3D%zu", + vm->as.id, start_iova, start_size, iova, &paddr, + mapped / pgsize, pgsize); + iova +=3D mapped; paddr +=3D mapped; len -=3D mapped; --=20 2.47.3