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Thu, 27 Sep 2018 10:17:24 -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> In-Reply-To: <1532697292-14272-14-git-send-email-loic.pallardy@st.com> From: Wendy Liang Date: Thu, 27 Sep 2018 10:17:13 -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 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? > + > + 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