On 05/06/22 21:54, Christophe JAILLET wrote:
> Hi,
>
> Just a few comments below, for what they worth.
>
> Le 31/05/2022 à 11:51, Puranjay Mohan a écrit :
>> From: Roger Quadros <rogerq-l0cyMroinI0@xxxxxxxxxxxxxxxx>
>>
>> This is the Ethernet driver for TI AM654 Silicon rev. 2
>> with the ICSSG PRU Sub-system running dual-EMAC firmware.
>>
>
> [...]
>
>> +static int prueth_netdev_init(struct prueth *prueth,
>> + struct device_node *eth_node)
>> +{
>> + int ret, num_tx_chn = PRUETH_MAX_TX_QUEUES;
>> + struct prueth_emac *emac;
>> + struct net_device *ndev;
>> + enum prueth_port port;
>> + enum prueth_mac mac;
>> +
>> + port = prueth_node_port(eth_node);
>> + if (port < 0)
>> + return -EINVAL;
>> +
>> + mac = prueth_node_mac(eth_node);
>> + if (mac < 0)
>> + return -EINVAL;
>> +
>> + ndev = alloc_etherdev_mq(sizeof(*emac), num_tx_chn);
>> + if (!ndev)
>> + return -ENOMEM;
>> +
>> + emac = netdev_priv(ndev);
>> + prueth->emac[mac] = emac;
>> + emac->prueth = prueth;
>> + emac->ndev = ndev;
>> + emac->port_id = port;
>> + emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
>> + if (!emac->cmd_wq) {
>> + ret = -ENOMEM;
>> + goto free_ndev;
>> + }
>> + INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);
>> +
>> + ret = pruss_request_mem_region(prueth->pruss,
>> + port == PRUETH_PORT_MII0 ?
>> + PRUSS_MEM_DRAM0 : PRUSS_MEM_DRAM1,
>> + &emac->dram);
>> + if (ret) {
>> + dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
>> + return -ENOMEM;
>
> goto free_wq; ?
>
I'll add it.
>> + }
>> +
>> + emac->tx_ch_num = 1;
>> +
>> + SET_NETDEV_DEV(ndev, prueth->dev);
>> + spin_lock_init(&emac->lock);
>> + mutex_init(&emac->cmd_lock);
>> +
>> + emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
>> + if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
>> + dev_err(prueth->dev, "couldn't find phy-handle\n");
>> + ret = -ENODEV;
>> + goto free;
>> + } else if (of_phy_is_fixed_link(eth_node)) {
>> + ret = of_phy_register_fixed_link(eth_node);
>> + if (ret) {
>> + ret = dev_err_probe(prueth->dev, ret,
>> + "failed to register fixed-link phy\n");
>> + goto free;
>> + }
>> +
>> + emac->phy_node = eth_node;
>> + }
>> +
>> + ret = of_get_phy_mode(eth_node, &emac->phy_if);
>> + if (ret) {
>> + dev_err(prueth->dev, "could not get phy-mode property\n");
>> + goto free;
>> + }
>> +
>> + if (emac->phy_if != PHY_INTERFACE_MODE_MII &&
>> + !phy_interface_mode_is_rgmii(emac->phy_if)) {
>> + dev_err(prueth->dev, "PHY mode unsupported %s\n",
>> phy_modes(emac->phy_if));
>> + goto free;
>> + }
>> +
>> + ret = prueth_config_rgmiidelay(prueth, eth_node, emac->phy_if);
>> + if (ret)
>> + goto free;
>> +
>> + /* get mac address from DT and set private and netdev addr */
>> + ret = of_get_ethdev_address(eth_node, ndev);
>> + if (!is_valid_ether_addr(ndev->dev_addr)) {
>> + eth_hw_addr_random(ndev);
>> + dev_warn(prueth->dev, "port %d: using random MAC addr: %pM\n",
>> + port, ndev->dev_addr);
>> + }
>> + ether_addr_copy(emac->mac_addr, ndev->dev_addr);
>> +
>> + ndev->netdev_ops = &emac_netdev_ops;
>> + ndev->ethtool_ops = &icssg_ethtool_ops;
>> + ndev->hw_features = NETIF_F_SG;
>> + ndev->features = ndev->hw_features;
>> +
>> + netif_napi_add(ndev, &emac->napi_rx,
>> + emac_napi_rx_poll, NAPI_POLL_WEIGHT);
>> +
>> + return 0;
>> +
>> +free:
>> + pruss_release_mem_region(prueth->pruss, &emac->dram);
>
> free_wq:
>
>From what I understand, the labels would look like this.
free:
pruss_release_mem_region(prueth->pruss, &emac->dram);
destroy_workqueue(emac->cmd_wq);
free_wq:
destroy_workqueue(emac->cmd_wq);
>> + destroy_workqueue(emac->cmd_wq);
>> +free_ndev:
>> + free_netdev(ndev);
>> + prueth->emac[mac] = NULL;
>> +
>> + return ret;
>> +}
>> +
>> +static void prueth_netdev_exit(struct prueth *prueth,
>> + struct device_node *eth_node)
>> +{
>> + struct prueth_emac *emac;
>> + enum prueth_mac mac;
>> +
>> + mac = prueth_node_mac(eth_node);
>> + if (mac < 0)
>> + return;
>> +
>> + emac = prueth->emac[mac];
>> + if (!emac)
>> + return;
>> +
>> + if (of_phy_is_fixed_link(emac->phy_node))
>> + of_phy_deregister_fixed_link(emac->phy_node);
>> +
>> + netif_napi_del(&emac->napi_rx);
>> +
>> + pruss_release_mem_region(prueth->pruss, &emac->dram);
>> + destroy_workqueue(emac->cmd_wq);
>> + free_netdev(emac->ndev);
>> + prueth->emac[mac] = NULL;
>> +}
>> +
>> +static int prueth_get_cores(struct prueth *prueth, int slice)
>> +{
>> + enum pruss_pru_id pruss_id;
>> + struct device *dev = prueth->dev;
>> + struct device_node *np = dev->of_node;
>> + int idx = -1, ret;
>> +
>> + switch (slice) {
>> + case ICSS_SLICE0:
>> + idx = 0;
>> + break;
>> + case ICSS_SLICE1:
>> + idx = 3;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + prueth->pru[slice] = pru_rproc_get(np, idx, &pruss_id);
>> + if (IS_ERR(prueth->pru[slice])) {
>> + ret = PTR_ERR(prueth->pru[slice]);
>> + prueth->pru[slice] = NULL;
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev, "unable to get PRU%d: %d\n", slice, ret);
>
> return dev_err_probe()?
>
Sure I'll return dev_err_probe() instead of the above.
I'll add below line
return dev_err_probe(dev,ret,"unable to get PRU%d\n", slice);
>> + return ret;
>> + }
>> + prueth->pru_id[slice] = pruss_id;
>> +
>> + idx++;
>> + prueth->rtu[slice] = pru_rproc_get(np, idx, NULL);
>> + if (IS_ERR(prueth->rtu[slice])) {
>> + ret = PTR_ERR(prueth->rtu[slice]);
>> + prueth->rtu[slice] = NULL;
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev, "unable to get RTU%d: %d\n", slice, ret);
>
> Same.
>
Sure, I'll do that.
>> + return ret;
>> + }
>> +
>> + idx++;
>> + prueth->txpru[slice] = pru_rproc_get(np, idx, NULL);
>> + if (IS_ERR(prueth->txpru[slice])) {
>> + ret = PTR_ERR(prueth->txpru[slice]);
>> + prueth->txpru[slice] = NULL;
>> + if (ret != -EPROBE_DEFER)
>> + dev_err(dev, "unable to get TX_PRU%d: %d\n",
>> + slice, ret);
>
> Same.
>
Sure, I'll do that.
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void prueth_put_cores(struct prueth *prueth, int slice)
>> +{
>> + if (prueth->txpru[slice])
>> + pru_rproc_put(prueth->txpru[slice]);
>> +
>> + if (prueth->rtu[slice])
>> + pru_rproc_put(prueth->rtu[slice]);
>> +
>> + if (prueth->pru[slice])
>> + pru_rproc_put(prueth->pru[slice]);
>> +}
>> +
>> +static const struct of_device_id prueth_dt_match[];
>> +
>> +static int prueth_probe(struct platform_device *pdev)
>> +{
>> + struct prueth *prueth;
>> + struct device *dev = &pdev->dev;
>> + struct device_node *np = dev->of_node;
>> + struct device_node *eth_ports_node;
>> + struct device_node *eth_node;
>> + struct device_node *eth0_node, *eth1_node;
>> + const struct of_device_id *match;
>> + struct pruss *pruss;
>> + int i, ret;
>> + u32 msmc_ram_size;
>> + struct genpool_data_align gp_data = {
>> + .align = SZ_64K,
>> + };
>> +
>> + match = of_match_device(prueth_dt_match, dev);
>> + if (!match)
>> + return -ENODEV;
>> +
>> + prueth = devm_kzalloc(dev, sizeof(*prueth), GFP_KERNEL);
>> + if (!prueth)
>> + return -ENOMEM;
>> +
>> + dev_set_drvdata(dev, prueth);
>> + prueth->pdev = pdev;
>> + prueth->pdata = *(const struct prueth_pdata *)match->data;
>> +
>> + prueth->dev = dev;
>> + eth_ports_node = of_get_child_by_name(np, "ethernet-ports");
>> + if (!eth_ports_node)
>> + return -ENOENT;
>> +
>> + for_each_child_of_node(eth_ports_node, eth_node) {
>> + u32 reg;
>> +
>> + if (strcmp(eth_node->name, "port"))
>> + continue;
>> + ret = of_property_read_u32(eth_node, "reg", ®);
>> + if (ret < 0) {
>> + dev_err(dev, "%pOF error reading port_id %d\n",
>> + eth_node, ret);
>> + }
>> +
>> + of_node_get(eth_node);
>> +
>> + if (reg == 0)
>> + eth0_node = eth_node;
>> + else if (reg == 1)
>> + eth1_node = eth_node;
>> + else
>> + dev_err(dev, "port reg should be 0 or 1\n");
>> + }
>> +
>> + of_node_put(eth_ports_node);
>> +
>> + /* At least one node must be present and available else we fail */
>> + if (!eth0_node && !eth1_node) {
>> + dev_err(dev, "neither port0 nor port1 node available\n");
>> + return -ENODEV;
>> + }
>> +
>> + if (eth0_node == eth1_node) {
>> + dev_err(dev, "port0 and port1 can't have same reg\n");
>> + of_node_put(eth0_node);
>> + return -ENODEV;
>> + }
>> +
>> + prueth->eth_node[PRUETH_MAC0] = eth0_node;
>> + prueth->eth_node[PRUETH_MAC1] = eth1_node;
>> +
>> + prueth->miig_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-g-rt");
>> + if (IS_ERR(prueth->miig_rt)) {
>> + dev_err(dev, "couldn't get ti,mii-g-rt syscon regmap\n");
>> + return -ENODEV;
>> + }
>> +
>> + prueth->mii_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-rt");
>> + if (IS_ERR(prueth->mii_rt)) {
>> + dev_err(dev, "couldn't get ti,mii-rt syscon regmap\n");
>> + return -ENODEV;
>> + }
>> +
>> + if (eth0_node) {
>> + ret = prueth_get_cores(prueth, ICSS_SLICE0);
>> + if (ret)
>> + goto put_cores;
>> + }
>> +
>> + if (eth1_node) {
>> + ret = prueth_get_cores(prueth, ICSS_SLICE1);
>> + if (ret)
>> + goto put_cores;
>> + }
>> +
>> + pruss = pruss_get(eth0_node ?
>> + prueth->pru[ICSS_SLICE0] : prueth->pru[ICSS_SLICE1]);
>> + if (IS_ERR(pruss)) {
>> + ret = PTR_ERR(pruss);
>> + dev_err(dev, "unable to get pruss handle\n");
>> + goto put_cores;
>> + }
>> +
>> + prueth->pruss = pruss;
>> +
>> + ret = pruss_request_mem_region(pruss, PRUSS_MEM_SHRD_RAM2,
>> + &prueth->shram);
>> + if (ret) {
>> + dev_err(dev, "unable to get PRUSS SHRD RAM2: %d\n", ret);
>> + goto put_mem;
>
> Is it safe to call pruss_release_mem_region() if pruss_request_mem_region() has
> failed?
>
There is no need to call pruss_release_mem_region() if
pruss_request_mem_region() has failed.
The label put_mem, calls pruss_release_mem_region() and pruss_put().
Here instead of going to label and calling both the functions, I will just call
pruss_put() function.
So the if condition would be something like this.
if (ret) {
dev_err(dev, "unable to get PRUSS SHRD RAM2: %d\n", ret);
pruss_put(prueth->pruss);
}
> The other place where it is called it is not done the same way.
>
>> + }
>> +
>> + prueth->sram_pool = of_gen_pool_get(np, "sram", 0);
>> + if (!prueth->sram_pool) {
>> + dev_err(dev, "unable to get SRAM pool\n");
>> + ret = -ENODEV;
>> +
>> + goto put_mem;
>> + }
>> +
>> + msmc_ram_size = MSMC_RAM_SIZE;
>> +
>> + /* NOTE: FW bug needs buffer base to be 64KB aligned */
>> + prueth->msmcram.va =
>> + (void __iomem *)gen_pool_alloc_algo(prueth->sram_pool,
>> + msmc_ram_size,
>> + gen_pool_first_fit_align,
>> + &gp_data);
>> +
>> + if (!prueth->msmcram.va) {
>> + ret = -ENOMEM;
>> + dev_err(dev, "unable to allocate MSMC resource\n");
>> + goto put_mem;
>> + }
>> + prueth->msmcram.pa = gen_pool_virt_to_phys(prueth->sram_pool,
>> + (unsigned long)prueth->msmcram.va);
>> + prueth->msmcram.size = msmc_ram_size;
>> + memset(prueth->msmcram.va, 0, msmc_ram_size);
>> + dev_dbg(dev, "sram: pa %llx va %p size %zx\n", prueth->msmcram.pa,
>> + prueth->msmcram.va, prueth->msmcram.size);
>> +
>> + /* setup netdev interfaces */
>> + if (eth0_node) {
>> + ret = prueth_netdev_init(prueth, eth0_node);
>> + if (ret) {
>> + if (ret != -EPROBE_DEFER) {
>> + dev_err(dev, "netdev init %s failed: %d\n",
>> + eth0_node->name, ret);
>
> dev_err_probe()?
>
Sure, I'll do that.
>> + }
>> + goto netdev_exit;
>> + }
>> + }
>> +
>> + if (eth1_node) {
>> + ret = prueth_netdev_init(prueth, eth1_node);
>> + if (ret) {
>> + if (ret != -EPROBE_DEFER) {
>> + dev_err(dev, "netdev init %s failed: %d\n",
>> + eth1_node->name, ret);
>
> dev_err_probe()?
>
Sure, I'll do that.
>> + }
>> + goto netdev_exit;
>> + }
>> + }
>> +
>> + /* register the network devices */
>> + if (eth0_node) {
>> + ret = register_netdev(prueth->emac[PRUETH_MAC0]->ndev);
>> + if (ret) {
>> + dev_err(dev, "can't register netdev for port MII0");
>> + goto netdev_exit;
>> + }
>> +
>> + prueth->registered_netdevs[PRUETH_MAC0] =
>> prueth->emac[PRUETH_MAC0]->ndev;
>> +
>> + emac_phy_connect(prueth->emac[PRUETH_MAC0]);
>> + phy_attached_info(prueth->emac[PRUETH_MAC0]->ndev->phydev);
>> + }
>> +
>> + if (eth1_node) {
>> + ret = register_netdev(prueth->emac[PRUETH_MAC1]->ndev);
>> + if (ret) {
>> + dev_err(dev, "can't register netdev for port MII1");
>> + goto netdev_unregister;
>> + }
>> +
>> + prueth->registered_netdevs[PRUETH_MAC1] =
>> prueth->emac[PRUETH_MAC1]->ndev;
>> + emac_phy_connect(prueth->emac[PRUETH_MAC1]);
>> + phy_attached_info(prueth->emac[PRUETH_MAC1]->ndev->phydev);
>> + }
>> +
>> + dev_info(dev, "TI PRU ethernet driver initialized: %s EMAC mode\n",
>> + (!eth0_node || !eth1_node) ? "single" : "dual");
>> +
>> + if (eth1_node)
>> + of_node_put(eth1_node);
>> + if (eth0_node)
>> + of_node_put(eth0_node);
>> + return 0;
>> +
>> +netdev_unregister:
>> + for (i = 0; i < PRUETH_NUM_MACS; i++) {
>> + if (!prueth->registered_netdevs[i])
>> + continue;
>> + if (prueth->emac[i]->ndev->phydev) {
>> + phy_disconnect(prueth->emac[i]->ndev->phydev);
>> + prueth->emac[i]->ndev->phydev = NULL;
>> + }
>> + unregister_netdev(prueth->registered_netdevs[i]);
>> + }
>> +
>> +netdev_exit:
>> + for (i = 0; i < PRUETH_NUM_MACS; i++) {
>> + struct device_node *eth_node;
>> +
>> + eth_node = prueth->eth_node[i];
>> + if (!eth_node)
>> + continue;
>> +
>> + prueth_netdev_exit(prueth, eth_node);
>> + }
>> +
>> +gen_pool_free(prueth->sram_pool,
>
> 1 tab missing.
>
I'll indent it properly.
>> + (unsigned long)prueth->msmcram.va, msmc_ram_size);
>> +
>> +put_mem:
>> + pruss_release_mem_region(prueth->pruss, &prueth->shram);
>> + pruss_put(prueth->pruss);
>> +
>> +put_cores:
>> + if (eth1_node) {
>> + prueth_put_cores(prueth, ICSS_SLICE1);
>> + of_node_put(eth1_node);
>> + }
>> +
>> + if (eth0_node) {
>> + prueth_put_cores(prueth, ICSS_SLICE0);
>> + of_node_put(eth0_node);
>> + }
>> +
>> + return ret;
>> +}
>
> [...]
>
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> Subject: Re: [PATCH v2 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver
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> To: p-mohan@xxxxxx
> References: <20220531095108.21757-1-p-mohan@xxxxxx>
> <20220531095108.21757-3-p-mohan@xxxxxx>
> From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> In-Reply-To: <20220531095108.21757-3-p-mohan@xxxxxx>
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