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Thu, 27 Sep 2018 13:19:04 -0700 (PDT) MIME-Version: 1.0 References: <1532697292-14272-1-git-send-email-loic.pallardy@st.com> <1532697292-14272-14-git-send-email-loic.pallardy@st.com> <88325716f2a6447a9e12312674be317b@SFHDAG7NODE2.st.com> In-Reply-To: <88325716f2a6447a9e12312674be317b@SFHDAG7NODE2.st.com> From: Wendy Liang Date: Thu, 27 Sep 2018 13:18:52 -0700 Message-ID: Subject: Re: [PATCH v4 13/17] remoteproc: create vdev subdevice with specific dma memory pool To: Loic Pallardy Cc: Bjorn Andersson , Ohad Ben-Cohen , linux-remoteproc@vger.kernel.org, Linux Kernel Mailing List , arnaud.pouliquen@st.com, benjamin.gaignard@linaro.org, Suman Anna Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Loic, On Thu, Sep 27, 2018 at 12:22 PM Loic PALLARDY wrote: > > Hi Wendy > > > -----Original Message----- > > From: Wendy Liang > > Sent: Thursday, September 27, 2018 7:17 PM > > To: Loic PALLARDY > > Cc: Bjorn Andersson ; Ohad Ben-Cohen > > ; linux-remoteproc@vger.kernel.org; Linux Kernel > > Mailing List ; Arnaud POULIQUEN > > ; benjamin.gaignard@linaro.org; Suman Anna > > > > Subject: Re: [PATCH v4 13/17] remoteproc: create vdev subdevice with > > specific dma memory pool > > > > On Fri, Jul 27, 2018 at 6:16 AM Loic Pallardy wrote: > > > > > > This patch creates a dedicated vdev subdevice for each vdev declared > > > in firmware resource table and associates carveout named "vdev%dbuffer" > > > (with %d vdev index in resource table) if any as dma coherent memory > > pool. > > > > > > Then vdev subdevice is used as parent for virtio device. > > > > > > Signed-off-by: Loic Pallardy > > > --- > > > drivers/remoteproc/remoteproc_core.c | 35 > > +++++++++++++++++++++++--- > > > drivers/remoteproc/remoteproc_internal.h | 1 + > > > drivers/remoteproc/remoteproc_virtio.c | 42 > > +++++++++++++++++++++++++++++++- > > > include/linux/remoteproc.h | 1 + > > > 4 files changed, 75 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/remoteproc/remoteproc_core.c > > b/drivers/remoteproc/remoteproc_core.c > > > index 4edc6f0..adcc66e 100644 > > > --- a/drivers/remoteproc/remoteproc_core.c > > > +++ b/drivers/remoteproc/remoteproc_core.c > > > @@ -39,6 +39,7 @@ > > > #include > > > #include > > > #include > > > +#include > > > #include > > > #include > > > #include > > > @@ -145,7 +146,7 @@ static void rproc_disable_iommu(struct rproc > > *rproc) > > > iommu_domain_free(domain); > > > } > > > > > > -static phys_addr_t rproc_va_to_pa(void *cpu_addr) > > > +phys_addr_t rproc_va_to_pa(void *cpu_addr) > > > { > > > /* > > > * Return physical address according to virtual address location > > > @@ -160,6 +161,7 @@ static phys_addr_t rproc_va_to_pa(void > > *cpu_addr) > > > WARN_ON(!virt_addr_valid(cpu_addr)); > > > return virt_to_phys(cpu_addr); > > > } > > > +EXPORT_SYMBOL(rproc_va_to_pa); > > > > > > /** > > > * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc > > address > > > @@ -423,6 +425,20 @@ static void rproc_vdev_do_stop(struct > > rproc_subdev *subdev, bool crashed) > > > } > > > > > > /** > > > + * rproc_rvdev_release() - release the existence of a rvdev > > > + * > > > + * @dev: the subdevice's dev > > > + */ > > > +static void rproc_rvdev_release(struct device *dev) > > > +{ > > > + struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev); > > > + > > > + of_reserved_mem_device_release(dev); > > > + > > > + kfree(rvdev); > > > +} > > > + > > > +/** > > > * rproc_handle_vdev() - handle a vdev fw resource > > > * @rproc: the remote processor > > > * @rsc: the vring resource descriptor > > > @@ -455,6 +471,7 @@ static int rproc_handle_vdev(struct rproc *rproc, > > struct fw_rsc_vdev *rsc, > > > struct device *dev = &rproc->dev; > > > struct rproc_vdev *rvdev; > > > int i, ret; > > > + char name[16]; > > > > > > /* make sure resource isn't truncated */ > > > if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct > > fw_rsc_vdev_vring) > > > @@ -488,6 +505,18 @@ static int rproc_handle_vdev(struct rproc *rproc, > > struct fw_rsc_vdev *rsc, > > > rvdev->rproc = rproc; > > > rvdev->index = rproc->nb_vdev++; > > > > > > + /* Initialise vdev subdevice */ > > > + snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index); > > > + rvdev->dev.parent = rproc->dev.parent; > > > + rvdev->dev.release = rproc_rvdev_release; > > > + dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev- > > >dev.parent), name); > > > + dev_set_drvdata(&rvdev->dev, rvdev); > > > + dma_set_coherent_mask(&rvdev->dev, DMA_BIT_MASK(32)); > > I tried the latest kernel, this function will not set the DMA coherent mask as > > dma_supported() of the &rvdev->dev will return false. > > As this is a device created at run time, should it be force to support DMA? > > should it directly set the dma_coherent_mask? > > Thanks for pointing me this issue. I tested on top of 4.18-rc1 few months ago... > Could you please give me kernel version on which you are testing the series? > Is you platform 32bit or 64bit ? > I'll rebase and check on my side. I am testing with 4.19-rc4 on aarch64 platform. Best Regards, Wendy > > Regards, > Loic > > > > > > + > > > + ret = device_register(&rvdev->dev); > > > + if (ret) > > > + goto free_rvdev; > > > + > > > /* parse the vrings */ > > > for (i = 0; i < rsc->num_of_vrings; i++) { > > > ret = rproc_parse_vring(rvdev, rsc, i); > > > @@ -518,7 +547,7 @@ static int rproc_handle_vdev(struct rproc *rproc, > > struct fw_rsc_vdev *rsc, > > > for (i--; i >= 0; i--) > > > rproc_free_vring(&rvdev->vring[i]); > > > free_rvdev: > > > - kfree(rvdev); > > > + device_unregister(&rvdev->dev); > > > return ret; > > > } > > > > > > @@ -536,7 +565,7 @@ void rproc_vdev_release(struct kref *ref) > > > > > > rproc_remove_subdev(rproc, &rvdev->subdev); > > > list_del(&rvdev->node); > > > - kfree(rvdev); > > > + device_unregister(&rvdev->dev); > > > } > > > > > > /** > > > diff --git a/drivers/remoteproc/remoteproc_internal.h > > b/drivers/remoteproc/remoteproc_internal.h > > > index f6cad24..bfeacfd 100644 > > > --- a/drivers/remoteproc/remoteproc_internal.h > > > +++ b/drivers/remoteproc/remoteproc_internal.h > > > @@ -52,6 +52,7 @@ struct dentry *rproc_create_trace_file(const char > > *name, struct rproc *rproc, > > > int rproc_alloc_vring(struct rproc_vdev *rvdev, int i); > > > > > > void *rproc_da_to_va(struct rproc *rproc, u64 da, int len); > > > +phys_addr_t rproc_va_to_pa(void *cpu_addr); > > > int rproc_trigger_recovery(struct rproc *rproc); > > > > > > int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw); > > > diff --git a/drivers/remoteproc/remoteproc_virtio.c > > b/drivers/remoteproc/remoteproc_virtio.c > > > index de21f62..9ee63c0 100644 > > > --- a/drivers/remoteproc/remoteproc_virtio.c > > > +++ b/drivers/remoteproc/remoteproc_virtio.c > > > @@ -17,7 +17,9 @@ > > > * GNU General Public License for more details. > > > */ > > > > > > +#include > > > #include > > > +#include > > > #include > > > #include > > > #include > > > @@ -315,10 +317,48 @@ static void rproc_virtio_dev_release(struct device > > *dev) > > > int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id) > > > { > > > struct rproc *rproc = rvdev->rproc; > > > - struct device *dev = &rproc->dev; > > > + struct device *dev = &rvdev->dev; > > > struct virtio_device *vdev = &rvdev->vdev; > > > + struct rproc_mem_entry *mem; > > > int ret; > > > > > > + /* Try to find dedicated vdev buffer carveout */ > > > + mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev- > > >index); > > > + if (mem) { > > > + phys_addr_t pa; > > > + > > > + if (mem->of_resm_idx != -1) { > > > + struct device_node *np = rproc->dev.parent->of_node; > > > + > > > + /* Associate reserved memory to vdev device */ > > > + ret = of_reserved_mem_device_init_by_idx(dev, np, > > > + mem->of_resm_idx); > > > + if (ret) { > > > + dev_err(dev, "Can't associate reserved memory\n"); > > > + goto out; > > > + } > > > + } else { > > > + if (mem->va) { > > > + dev_warn(dev, "vdev %d buffer already mapped\n", > > > + rvdev->index); > > > + pa = rproc_va_to_pa(mem->va); > > > + } else { > > > + /* Use dma address as carveout no memmapped yet */ > > > + pa = (phys_addr_t)mem->dma; > > > + } > > > + > > > + /* Associate vdev buffer memory pool to vdev subdev */ > > > + ret = dmam_declare_coherent_memory(dev, pa, > > > + mem->da, > > > + mem->len, > > > + DMA_MEMORY_EXCLUSIVE); > > > + if (ret < 0) { > > > + dev_err(dev, "Failed to associate buffer\n"); > > > + goto out; > > > + } > > > + } > > > + } > > > + > > > vdev->id.device = id, > > > vdev->config = &rproc_virtio_config_ops, > > > vdev->dev.parent = dev; > > > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h > > > index 6b3a234..2921dd2 100644 > > > --- a/include/linux/remoteproc.h > > > +++ b/include/linux/remoteproc.h > > > @@ -547,6 +547,7 @@ struct rproc_vdev { > > > struct kref refcount; > > > > > > struct rproc_subdev subdev; > > > + struct device dev; > > > > > > unsigned int id; > > > struct list_head node; > > > -- > > > 1.9.1 > > > > > > -- > > > To unsubscribe from this list: send the line "unsubscribe linux-remoteproc" > > in > > > the body of a message to majordomo@vger.kernel.org > > > More majordomo info at http://vger.kernel.org/majordomo-info.html