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[144.178.202.138]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b07b3347b6fsm1118969766b.111.2025.09.16.01.41.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Sep 2025 01:41:02 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 16 Sep 2025 10:41:01 +0200 Message-Id: Cc: "Arnd Bergmann" , "Mark Brown" , "Wesley Cheng" , "Jaroslav Kysela" , "Takashi Iwai" , "Greg Kroah-Hartman" , "Dan Carpenter" , , Subject: Re: [PATCH 3/3] ALSA: qc_audio_offload: try to reduce address space confusion From: "Luca Weiss" To: "Arnd Bergmann" , "Takashi Iwai" , "Luca Weiss" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20250513123442.159936-1-arnd@kernel.org> <20250513123442.159936-4-arnd@kernel.org> <87v7n72pg0.wl-tiwai@suse.de> <87ms8j2on6.wl-tiwai@suse.de> <87bjnpqe45.wl-tiwai@suse.de> In-Reply-To: Hi Arnd, On Fri Sep 5, 2025 at 4:54 PM CEST, Arnd Bergmann wrote: > On Fri, Sep 5, 2025, at 14:26, Takashi Iwai wrote: >> On Fri, 05 Sep 2025 13:47:28 +0200, > >> @@ -1051,18 +1050,13 @@ static int uaudio_transfer_buffer_setup(struct= =20 >> snd_usb_substream *subs, >> if (!xfer_buf) >> return -ENOMEM; >>=20 >> - /* Remapping is not possible if xfer_buf is outside of linear map */ >> - xfer_buf_pa =3D virt_to_phys(xfer_buf); >> - if (WARN_ON(!page_is_ram(PFN_DOWN(xfer_buf_pa)))) { >> - ret =3D -ENXIO; >> - goto unmap_sync; >> - } >> dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf, >> xfer_buf_dma, len); >>=20 >> /* map the physical buffer into sysdev as well */ >> + /* note: 0 is passed to pa argument as we use sgt */ >> xfer_buf_dma_sysdev =3D uaudio_iommu_map(MEM_XFER_BUF, dma_coherent, >> - xfer_buf_pa, len, &xfer_buf_sgt); >> + 0, len, &xfer_buf_sgt); >> if (!xfer_buf_dma_sysdev) { >> ret =3D -ENOMEM; >> goto unmap_sync; > > > Makes sense. I had to rework the code a little more to actually > understand how it fits together, for reference the below version > (I don't expect it to build cleanly) would split up > uaudio_iommu_map() into one function that takes a physical > address and another function that takes an sg table. Are you planning to post this as a proper patch? It's a bit late in the 6.17 cycle already but good to still get this fixed for final release. Or revert the original commit that broke it for now. I couldn't really test your patch since there's a couple of compile errors where I wasn't sure how to resolve them correctly. Regards Luca > > Arnd > > diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_= offload.c > index a25c5a531690..f843c2181da5 100644 > --- a/sound/usb/qcom/qc_audio_offload.c > +++ b/sound/usb/qcom/qc_audio_offload.c > @@ -539,32 +539,24 @@ static void uaudio_iommu_unmap(enum mem_type mtype,= unsigned long iova, > } > =20 > /** > - * uaudio_iommu_map() - maps iommu memory for adsp > + * uaudio_iommu_map_pa() - maps iommu memory for adsp > * @mtype: ring type > * @dma_coherent: dma coherent > * @pa: physical address for ring/buffer > * @size: size of memory region > - * @sgt: sg table for memory region > * > * Maps the XHCI related resources to a memory region that is assigned t= o be > * used by the adsp. This will be mapped to the domain, which is create= d by > * the ASoC USB backend driver. > * > */ > -static unsigned long uaudio_iommu_map(enum mem_type mtype, bool dma_cohe= rent, > - phys_addr_t pa, size_t size, > - struct sg_table *sgt) > +static unsigned long uaudio_iommu_map_pa(enum mem_type mtype, bool dma_c= oherent, > + phys_addr_t pa, size_t size) > { > struct scatterlist *sg; > unsigned long iova =3D 0; > - size_t total_len =3D 0; > - unsigned long iova_sg; > - phys_addr_t pa_sg; > bool map =3D true; > - size_t sg_len; > int prot; > - int ret; > - int i; > =20 > prot =3D IOMMU_READ | IOMMU_WRITE; > =20 > @@ -583,20 +575,42 @@ static unsigned long uaudio_iommu_map(enum mem_type= mtype, bool dma_coherent, > &uaudio_qdev->xfer_ring_iova_size, > &uaudio_qdev->xfer_ring_list, size); > break; > - case MEM_XFER_BUF: > - iova =3D uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova, > - &uaudio_qdev->xfer_buf_iova_size, > - &uaudio_qdev->xfer_buf_list, size); > - break; > default: > dev_err(uaudio_qdev->data->dev, "unknown mem type %d\n", mtype); > } > =20 > if (!iova || !map) > - goto done; > + return 0; > =20 > - if (!sgt) > - goto skip_sgt_map; > + iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, GFP_KERNEL); > + > +done: > + return iova; > +} > + > +static unsigned long uaudio_iommu_map_xfer_buf(bool dma_coherent, > + size_t size, struct sg_table *sgt) > +{ > + struct scatterlist *sg; > + unsigned long iova =3D 0; > + size_t total_len =3D 0; > + unsigned long iova_sg; > + phys_addr_t pa_sg; > + size_t sg_len; > + int prot; > + int ret; > + int i; > + > + prot =3D IOMMU_READ | IOMMU_WRITE; > + > + if (dma_coherent) > + prot |=3D IOMMU_CACHE; > + > + iova =3D uaudio_get_iova(&uaudio_qdev->curr_xfer_buf_iova, > + &uaudio_qdev->xfer_buf_iova_size, > + &uaudio_qdev->xfer_buf_list, size); > + if (!iova) > + goto done; > =20 > iova_sg =3D iova; > for_each_sg(sgt->sgl, sg, sgt->nents, i) { > @@ -618,11 +632,6 @@ static unsigned long uaudio_iommu_map(enum mem_type = mtype, bool dma_coherent, > uaudio_iommu_unmap(MEM_XFER_BUF, iova, size, total_len); > iova =3D 0; > } > - return iova; > - > -skip_sgt_map: > - iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, GFP_KERNEL); > - > done: > return iova; > } > @@ -1061,8 +1070,8 @@ static int uaudio_transfer_buffer_setup(struct snd_= usb_substream *subs, > xfer_buf_dma, len); > =20 > /* map the physical buffer into sysdev as well */ > - xfer_buf_dma_sysdev =3D uaudio_iommu_map(MEM_XFER_BUF, dma_coherent, > - xfer_buf_pa, len, &xfer_buf_sgt); > + xfer_buf_dma_sysdev =3D uaudio_iommu_map_xfer_buf(dma_coherent, xfer_bu= f_pa, > + len, &xfer_buf_sgt); > if (!xfer_buf_dma_sysdev) { > ret =3D -ENOMEM; > goto unmap_sync; > @@ -1143,8 +1152,8 @@ uaudio_endpoint_setup(struct snd_usb_substream *sub= s, > sg_free_table(sgt); > =20 > /* data transfer ring */ > - iova =3D uaudio_iommu_map(MEM_XFER_RING, dma_coherent, tr_pa, > - PAGE_SIZE, NULL); > + iova =3D uaudio_iommu_map_pa(MEM_XFER_RING, dma_coherent, tr_pa, > + PAGE_SIZE); > if (!iova) { > ret =3D -ENOMEM; > goto clear_pa; > @@ -1207,8 +1216,8 @@ static int uaudio_event_ring_setup(struct snd_usb_s= ubstream *subs, > mem_info->dma =3D sg_dma_address(sgt->sgl); > sg_free_table(sgt); > =20 > - iova =3D uaudio_iommu_map(MEM_EVENT_RING, dma_coherent, er_pa, > - PAGE_SIZE, NULL); > + iova =3D uaudio_iommu_map_pa(MEM_EVENT_RING, dma_coherent, er_pa, > + PAGE_SIZE); > if (!iova) { > ret =3D -ENOMEM; > goto clear_pa;