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Fri, 21 Mar 2025 07:33:58 -0700 (PDT) Date: Fri, 21 Mar 2025 17:33:56 +0300 From: Dan Carpenter To: Shannon Nelson Cc: jgg@nvidia.com, andrew.gospodarek@broadcom.com, aron.silverton@oracle.com, dan.j.williams@intel.com, daniel.vetter@ffwll.ch, dave.jiang@intel.com, dsahern@kernel.org, gregkh@linuxfoundation.org, hch@infradead.org, itayavr@nvidia.com, jiri@nvidia.com, Jonathan.Cameron@huawei.com, kuba@kernel.org, lbloch@nvidia.com, leonro@nvidia.com, linux-cxl@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, saeedm@nvidia.com, brett.creeley@amd.com Subject: Re: [PATCH v4 5/6] pds_fwctl: add rpc and query support Message-ID: References: <20250319213237.63463-1-shannon.nelson@amd.com> <20250319213237.63463-6-shannon.nelson@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250319213237.63463-6-shannon.nelson@amd.com> On Wed, Mar 19, 2025 at 02:32:36PM -0700, Shannon Nelson wrote: > +static struct pds_fwctl_query_data *pdsfc_get_endpoints(struct pdsfc_dev *pdsfc, > + dma_addr_t *pa) > +{ > + struct device *dev = &pdsfc->fwctl.dev; > + union pds_core_adminq_comp comp = {0}; > + struct pds_fwctl_query_data *data; > + union pds_core_adminq_cmd cmd; > + dma_addr_t data_pa; > + int err; > + > + data = dma_alloc_coherent(dev->parent, PAGE_SIZE, &data_pa, GFP_KERNEL); > + err = dma_mapping_error(dev, data_pa); > + if (err) { > + dev_err(dev, "Failed to map endpoint list\n"); > + return ERR_PTR(err); > + } This doesn't work. The dma_alloc_coherent() function doesn't necessarily initialize data_pa. I don't know very much about DMA but can't we just check: data = dma_alloc_coherent(dev->parent, PAGE_SIZE, &data_pa, GFP_KERNEL); if (!data) return ERR_PTR(-ENOMEM); regards, dan carpenter > + > + cmd = (union pds_core_adminq_cmd) { > + .fwctl_query = { > + .opcode = PDS_FWCTL_CMD_QUERY, > + .entity = PDS_FWCTL_RPC_ROOT, > + .version = 0, > + .query_data_buf_len = cpu_to_le32(PAGE_SIZE), > + .query_data_buf_pa = cpu_to_le64(data_pa), > + } > + }; > + > + err = pds_client_adminq_cmd(pdsfc->padev, &cmd, sizeof(cmd), &comp, 0); > + if (err) { > + dev_err(dev, "Failed to send adminq cmd opcode: %u entity: %u err: %d\n", > + cmd.fwctl_query.opcode, cmd.fwctl_query.entity, err); > + dma_free_coherent(dev->parent, PAGE_SIZE, data, data_pa); > + return ERR_PTR(err); > + } > + > + *pa = data_pa; > + > + return data; > +}