Я собрал модуль ядра, который вызывает некоторые проблемы. Через некоторое время после загрузки драйвер перестает работать, и в тот момент, когда я пытаюсь использовать rmmod для его выгрузки, он блокируется, и мне приходится вручную перезагружать устройство. Мне удалось получить этот след, используя основную консоль моей карты с подключением USB-TTL:
Probe: Successful
xeno_sprinte_ida on AUART3: physical address=0x80070000 membase=0xc8e3c000 irq=234 uartclk=24000000
Init: Successful
------------[ cut here ]------------
------------[ cut here ]------------
WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:130 clk_enable_lock+0x98/0xd4
Modules linked in: moduleXenoUartSimple(O-) snd_soc_mxs_sgtl5000 snd_soc_sgtl5000 snd_soc_mxs snd_soc_mxs_pcm snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ums_alauda uas ums_onetouch ums_cypress ums_karma ums_jumpshot ums_eneub6250 firmware_class ums_usbat ums_sddr55 ums_sddr09 ums_freecom ums_datafab ums_isd200 ums_realtek usb_storage scsi_mod ci_hdrc_usb2 ci_hdrc_imx usbmisc_imx ci_hdrc ehci_hcd usbmon usbcore usb_common mxs_mmc sdhci_pltfm sdhci mmc_block mmc_core jffs2 ntfs ext2 vfat fat ipv6 lm75 hwmon fuse xeno_udd xeno_rtipc xeno_can_flexcan xeno_can [last unloaded: moduleXenoUartSimple]
CPU: 0 PID: 825 Comm: rmmod Tainted: G O 4.9.24-ipipe-SPOS-0.2 #1
Hardware name: Freescale MXS (Device Tree)
I-pipe domain: Linux
[<c000f540>] (unwind_backtrace) from [<c000d5d0>] (show_stack+0x10/0x14)
[<c000d5d0>] (show_stack) from [<c0018cb0>] (__warn+0xd4/0xfc)
[<c0018cb0>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0250dfc>] (clk_enable_lock+0x98/0xd4)
[<c0250dfc>] (clk_enable_lock) from [<c0252500>] (clk_core_enable_lock+0xc/0x2c)
[<c0252500>] (clk_core_enable_lock) from [<c0282ac0>] (pl011_console_write+0x20/0x1ac)
[<c0282ac0>] (pl011_console_write) from [<c00480f0>] (call_console_drivers.constprop.11+0x98/0xac)
[<c00480f0>] (call_console_drivers.constprop.11) from [<c0049104>] (console_unlock+0x2d0/0x6f0)
[<c0049104>] (console_unlock) from [<c00497e4>] (vprintk_emit+0x2c0/0x49c)
[<c00497e4>] (vprintk_emit) from [<c0049b4c>] (vprintk_default+0x20/0x28)
[<c0049b4c>] (vprintk_default) from [<c00ade9c>] (printk+0xe8/0x188)
[<c00ade9c>] (printk) from [<c0018c04>] (__warn+0x28/0xfc)
[<c0018c04>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0252464>] (clk_core_disable_lock+0x18/0x24)
[<c0252464>] (clk_core_disable_lock) from [<bf2fc184>] (rt_mxs_auart_remove+0x1c/0x54 [moduleXenoUartSimple])
[<bf2fc184>] (rt_mxs_auart_remove [moduleXenoUartSimple]) from [<c028f620>] (__device_release_driver+0x70/0xfc)
[<c028f620>] (__device_release_driver) from [<c028feb8>] (driver_detach+0xfc/0x100)
[<c028feb8>] (driver_detach) from [<c028f1f4>] (bus_remove_driver+0x4c/0xa0)
[<c028f1f4>] (bus_remove_driver) from [<bf2fcdd8>] (rt_mxs_auart_exit+0xc/0x20 [moduleXenoUartSimple])
[<bf2fcdd8>] (rt_mxs_auart_exit [moduleXenoUartSimple]) from [<c006fd5c>] (SyS_delete_module+0x15c/0x1cc)
[<c006fd5c>] (SyS_delete_module) from [<c000a500>] (ret_fast_syscall+0x0/0x38)
---[ end trace 94d65edb72d57359 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:131 clk_enable_lock+0xc0/0xd4
Modules linked in: moduleXenoUartSimple(O-) snd_soc_mxs_sgtl5000 snd_soc_sgtl5000 snd_soc_mxs snd_soc_mxs_pcm snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ums_alauda uas ums_onetouch ums_cypress ums_karma ums_jumpshot ums_eneub6250 firmware_class ums_usbat ums_sddr55 ums_sddr09 ums_freecom ums_datafab ums_isd200 ums_realtek usb_storage scsi_mod ci_hdrc_usb2 ci_hdrc_imx usbmisc_imx ci_hdrc ehci_hcd usbmon usbcore usb_common mxs_mmc sdhci_pltfm sdhci mmc_block mmc_core jffs2 ntfs ext2 vfat fat ipv6 lm75 hwmon fuse xeno_udd xeno_rtipc xeno_can_flexcan xeno_can [last unloaded: moduleXenoUartSimple]
CPU: 0 PID: 825 Comm: rmmod Tainted: G W O 4.9.24-ipipe-SPOS-0.2 #1
Hardware name: Freescale MXS (Device Tree)
I-pipe domain: Linux
[<c000f540>] (unwind_backtrace) from [<c000d5d0>] (show_stack+0x10/0x14)
[<c000d5d0>] (show_stack) from [<c0018cb0>] (__warn+0xd4/0xfc)
[<c0018cb0>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0250e24>] (clk_enable_lock+0xc0/0xd4)
[<c0250e24>] (clk_enable_lock) from [<c0252500>] (clk_core_enable_lock+0xc/0x2c)
[<c0252500>] (clk_core_enable_lock) from [<c0282ac0>] (pl011_console_write+0x20/0x1ac)
[<c0282ac0>] (pl011_console_write) from [<c00480f0>] (call_console_drivers.constprop.11+0x98/0xac)
[<c00480f0>] (call_console_drivers.constprop.11) from [<c0049104>] (console_unlock+0x2d0/0x6f0)
[<c0049104>] (console_unlock) from [<c00497e4>] (vprintk_emit+0x2c0/0x49c)
[<c00497e4>] (vprintk_emit) from [<c0049b4c>] (vprintk_default+0x20/0x28)
[<c0049b4c>] (vprintk_default) from [<c00ade9c>] (printk+0xe8/0x188)
[<c00ade9c>] (printk) from [<c0018c04>] (__warn+0x28/0xfc)
[<c0018c04>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0252464>] (clk_core_disable_lock+0x18/0x24)
[<c0252464>] (clk_core_disable_lock) from [<bf2fc184>] (rt_mxs_auart_remove+0x1c/0x54 [moduleXenoUartSimple])
[<bf2fc184>] (rt_mxs_auart_remove [moduleXenoUartSimple]) from [<c028f620>] (__device_release_driver+0x70/0xfc)
[<c028f620>] (__device_release_driver) from [<c028feb8>] (driver_detach+0xfc/0x100)
[<c028feb8>] (driver_detach) from [<c028f1f4>] (bus_remove_driver+0x4c/0xa0)
[<c028f1f4>] (bus_remove_driver) from [<bf2fcdd8>] (rt_mxs_auart_exit+0xc/0x20 [moduleXenoUartSimple])
[<bf2fcdd8>] (rt_mxs_auart_exit [moduleXenoUartSimple]) from [<c006fd5c>] (SyS_delete_module+0x15c/0x1cc)
[<c006fd5c>] (SyS_delete_module) from [<c000a500>] (ret_fast_syscall+0x0/0x38)
---[ end trace 94d65edb72d5735a ]---
WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:594 clk_core_disable_lock+0x18/0x24
Modules linked in: moduleXenoUartSimple(O-) snd_soc_mxs_sgtl5000 snd_soc_sgtl5000 snd_soc_mxs snd_soc_mxs_pcm snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ums_alauda uas ums_onetouch ums_cypress ums_karma ums_jumpshot ums_eneub6250 firmware_class ums_usbat ums_sddr55 ums_sddr09 ums_freecom ums_datafab ums_isd200 ums_realtek usb_storage scsi_mod ci_hdrc_usb2 ci_hdrc_imx usbmisc_imx ci_hdrc ehci_hcd usbmon usbcore usb_common mxs_mmc sdhci_pltfm sdhci mmc_block mmc_core jffs2 ntfs ext2 vfat fat ipv6 lm75 hwmon fuse xeno_udd xeno_rtipc xeno_can_flexcan xeno_can [last unloaded: moduleXenoUartSimple]
CPU: 0 PID: 825 Comm: rmmod Tainted: G W O 4.9.24-ipipe-SPOS-0.2 #1
Hardware name: Freescale MXS (Device Tree)
I-pipe domain: Linux
[<c000f540>] (unwind_backtrace) from [<c000d5d0>] (show_stack+0x10/0x14)
[<c000d5d0>] (show_stack) from [<c0018cb0>] (__warn+0xd4/0xfc)
[<c0018cb0>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0252464>] (clk_core_disable_lock+0x18/0x24)
[<c0252464>] (clk_core_disable_lock) from [<bf2fc184>] (rt_mxs_auart_remove+0x1c/0x54 [moduleXenoUartSimple])
[<bf2fc184>] (rt_mxs_auart_remove [moduleXenoUartSimple]) from [<c028f620>] (__device_release_driver+0x70/0xfc)
[<c028f620>] (__device_release_driver) from [<c028feb8>] (driver_detach+0xfc/0x100)
[<c028feb8>] (driver_detach) from [<c028f1f4>] (bus_remove_driver+0x4c/0xa0)
[<c028f1f4>] (bus_remove_driver) from [<bf2fcdd8>] (rt_mxs_auart_exit+0xc/0x20 [moduleXenoUartSimple])
[<bf2fcdd8>] (rt_mxs_auart_exit [moduleXenoUartSimple]) from [<c006fd5c>] (SyS_delete_module+0x15c/0x1cc)
[<c006fd5c>] (SyS_delete_module) from [<c000a500>] (ret_fast_syscall+0x0/0x38)
---[ end trace 94d65edb72d5735b ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:140 clk_enable_unlock+0xb0/0xf8
Modules linked in: moduleXenoUartSimple(O-) snd_soc_mxs_sgtl5000 snd_soc_sgtl5000 snd_soc_mxs snd_soc_mxs_pcm snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ums_alauda uas ums_onetouch ums_cypress ums_karma ums_jumpshot ums_eneub6250 firmware_class ums_usbat ums_sddr55 ums_sddr09 ums_freecom ums_datafab ums_isd200 ums_realtek usb_storage scsi_mod ci_hdrc_usb2 ci_hdrc_imx usbmisc_imx ci_hdrc ehci_hcd usbmon usbcore usb_common mxs_mmc sdhci_pltfm sdhci mmc_block mmc_core jffs2 ntfs ext2 vfat fat ipv6 lm75 hwmon fuse xeno_udd xeno_rtipc xeno_can_flexcan xeno_can [last unloaded: moduleXenoUartSimple]
CPU: 0 PID: 825 Comm: rmmod Tainted: G W O 4.9.24-ipipe-SPOS-0.2 #1
Hardware name: Freescale MXS (Device Tree)
I-pipe domain: Linux
[<c000f540>] (unwind_backtrace) from [<c000d5d0>] (show_stack+0x10/0x14)
[<c000d5d0>] (show_stack) from [<c0018cb0>] (__warn+0xd4/0xfc)
[<c0018cb0>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0252404>] (clk_enable_unlock+0xb0/0xf8)
[<c0252404>] (clk_enable_unlock) from [<bf2fc184>] (rt_mxs_auart_remove+0x1c/0x54 [moduleXenoUartSimple])
[<bf2fc184>] (rt_mxs_auart_remove [moduleXenoUartSimple]) from [<c028f620>] (__device_release_driver+0x70/0xfc)
[<c028f620>] (__device_release_driver) from [<c028feb8>] (driver_detach+0xfc/0x100)
[<c028feb8>] (driver_detach) from [<c028f1f4>] (bus_remove_driver+0x4c/0xa0)
[<c028f1f4>] (bus_remove_driver) from [<bf2fcdd8>] (rt_mxs_auart_exit+0xc/0x20 [moduleXenoUartSimple])
[<bf2fcdd8>] (rt_mxs_auart_exit [moduleXenoUartSimple]) from [<c006fd5c>] (SyS_delete_module+0x15c/0x1cc)
[<c006fd5c>] (SyS_delete_module) from [<c000a500>] (ret_fast_syscall+0x0/0x38)
---[ end trace 94d65edb72d5735c ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:141 clk_enable_unlock+0xe4/0xf8
Modules linked in: moduleXenoUartSimple(O-) snd_soc_mxs_sgtl5000 snd_soc_sgtl5000 snd_soc_mxs snd_soc_mxs_pcm snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ums_alauda uas ums_onetouch ums_cypress ums_karma ums_jumpshot ums_eneub6250 firmware_class ums_usbat ums_sddr55 ums_sddr09 ums_freecom ums_datafab ums_isd200 ums_realtek usb_storage scsi_mod ci_hdrc_usb2 ci_hdrc_imx usbmisc_imx ci_hdrc ehci_hcd usbmon usbcore usb_common mxs_mmc sdhci_pltfm sdhci mmc_block mmc_core jffs2 ntfs ext2 vfat fat ipv6 lm75 hwmon fuse xeno_udd xeno_rtipc xeno_can_flexcan xeno_can [last unloaded: moduleXenoUartSimple]
CPU: 0 PID: 825 Comm: rmmod Tainted: G W O 4.9.24-ipipe-SPOS-0.2 #1
Hardware name: Freescale MXS (Device Tree)
I-pipe domain: Linux
[<c000f540>] (unwind_backtrace) from [<c000d5d0>] (show_stack+0x10/0x14)
[<c000d5d0>] (show_stack) from [<c0018cb0>] (__warn+0xd4/0xfc)
[<c0018cb0>] (__warn) from [<c0018d88>] (warn_slowpath_null+0x20/0x28)
[<c0018d88>] (warn_slowpath_null) from [<c0252438>] (clk_enable_unlock+0xe4/0xf8)
[<c0252438>] (clk_enable_unlock) from [<bf2fc184>] (rt_mxs_auart_remove+0x1c/0x54 [moduleXenoUartSimple])
[<bf2fc184>] (rt_mxs_auart_remove [moduleXenoUartSimple]) from [<c028f620>] (__device_release_driver+0x70/0xfc)
[<c028f620>] (__device_release_driver) from [<c028feb8>] (driver_detach+0xfc/0x100)
[<c028feb8>] (driver_detach) from [<c028f1f4>] (bus_remove_driver+0x4c/0xa0)
[<c028f1f4>] (bus_remove_driver) from [<bf2fcdd8>] (rt_mxs_auart_exit+0xc/0x20 [moduleXenoUartSimple])
[<bf2fcdd8>] (rt_mxs_auart_exit [moduleXenoUartSimple]) from [<c006fd5c>] (SyS_delete_module+0x15c/0x1cc)
[<c006fd5c>] (SyS_delete_module) from [<c000a500>] (ret_fast_syscall+0x0/0x38)
---[ end trace 94d65edb72d5735d ]---
Это не всегда происходит, и иногда я могу rmmod без проблем. Я подозреваю, что это связано с часами из-за сообщения WARNING: CPU: 0 PID: 825 at drivers/clk/clk.c:130 clk_enable_lock
Если это полезно, вот часть кода драйвера, который я использую (вдохновлено mxs-auart.c и rt_imx_uart.c)
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("IMX28 UART RTDM driver");
struct rt_mxs_auart_port {
unsigned long flags;
unsigned int mctrl_prev;
enum mxs_auart_type devtype;
const struct vendor_data *vendor;
struct clk *clk;
struct clk *clk_ahb;
unsigned char __iomem *membase; /* read/write[bwl] */
resource_size_t mapbase; /* for ioremap */
unsigned int irq; /* irq number */
int fifosize; /* TX fifo size*/
unsigned int uartclk; /* base uart clock */
struct rtdm_device rtdm_dev; /* RTDM device structure */
};
static int mxs_get_clks(struct rt_mxs_auart_port *s, struct platform_device *pdev)
{
int err;
if (!is_asm9260_auart(s)) {
s->clk = devm_clk_get(&pdev->dev, NULL);
return PTR_ERR_OR_ZERO(s->clk);
}
s->clk = devm_clk_get(&pdev->dev, "mod");
if (IS_ERR(s->clk)) {
pr_err("Failed to get \"mod\" clk\n");
return PTR_ERR(s->clk);
}
s->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(s->clk_ahb)) {
pr_err("Failed to get \"ahb\" clk\n");
return PTR_ERR(s->clk_ahb);
}
err = clk_prepare_enable(s->clk_ahb);
if (err) {
pr_err("Failed to enable ahb_clk!\n");
return err;
}
/*
err = clk_set_rate(s->clk, clk_get_rate(s->clk_ahb));
if (err) {
dev_err(s->dev, "Failed to set rate!\n");
goto disable_clk_ahb;
}
*/
err = clk_prepare_enable(s->clk);
if (err) {
pr_err("Failed to enable clk!\n");
goto disable_clk_ahb;
}
return 0;
disable_clk_ahb:
clk_disable_unprepare(s->clk_ahb);
return err;
}
static int rt_serial_mxs_probe_dt(struct rt_mxs_auart_port *s,
struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int ret;
if (!np)
/* no device tree device */
return 1;
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id: %d\n", ret);
return ret;
}
pdev->id = ret;
//s->port.line = ret;
return 0;
}
static int rt_mxs_auart_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(mxs_auart_dt_ids, &pdev->dev);
//u32 version;
int ret;
//int irq;
struct resource *r;
//we're adding this
struct rtdm_device *dev;
struct rt_mxs_auart_port *s;
//allocate managed kernel memory
s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
//s->port.dev = &pdev->dev;
//s->dev = &pdev->dev;
ret = rt_serial_mxs_probe_dt(s, pdev);
if (ret > 0)
pr_info("If ret>0\n");
//s->port.line = pdev->id < 0 ? 0 : pdev->id;//what do we do here?
else if (ret < 0){
return ret;
}
if (of_id) {
pdev->id_entry = of_id->data;
//s->devdata = of_id->data;
s->devtype = pdev->id_entry->driver_data;
}
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -ENXIO;
//get irq line
s->irq = platform_get_irq(pdev, 0);
if (s->irq < 0)
return -ENODEV;
//base memory
//s->membase = devm_ioremap_resource(&pdev->dev, r);
s->membase = ioremap(r->start, resource_size(r));
if (IS_ERR(s->membase))
return PTR_ERR(s->membase);
/*define the rtdm_device*/
dev = &s->rtdm_dev;
dev->driver = &ida_driver;
dev->label = "xeno_sprinte_ida";
dev->device_data = s;
ret = mxs_get_clks(s, pdev); //activate clocks
if (ret)
return ret;
s->uartclk = clk_get_rate(s->clk);
s->fifosize = MXS_AUART_FIFO_SIZE;
mxs_init_regs(s);
ret = rtdm_dev_register(dev); //register driver in RTDM space
if (ret)
return ret;
platform_set_drvdata(pdev, s); //add device-related data to device struct
pr_info("Probe: Successful\n");
pr_info("%s on AUART%d: physical address=0x%p membase=0x%p irq=%d uartclk=%d\n",
dev->name, pdev->id, r, s->membase, s->irq, s->uartclk);
return 0;
}
static int rt_mxs_auart_remove(struct platform_device *pdev)
{
struct rt_mxs_auart_port *s = platform_get_drvdata(pdev);
struct rtdm_device *dev = &s->rtdm_dev;
platform_set_drvdata(pdev, NULL);
clk_disable_unprepare(s->clk);
clk_disable_unprepare(s->clk_ahb);
rtdm_dev_unregister(dev);
pr_info("Remove: Successful\n");
return 0;
}
static struct platform_driver rt_mxs_auart_driver = {
.probe = rt_mxs_auart_probe,
.remove = rt_mxs_auart_remove,
.driver = {
.name = "xeno_sprinte_ida",
.of_match_table = mxs_auart_dt_ids,
},
};
static int __init rt_mxs_auart_init(void)
{
int ret;
/*what library to include?
if (!rtdm_available())
return -ENODEV;
*/
ret = platform_driver_register(&rt_mxs_auart_driver);
if (ret) {
pr_err("%s; Could not register driver (err=%d)\n",
__func__, ret);
}
pr_info("Init: Successful\n");
return ret;
}
static void __exit rt_mxs_auart_exit(void)
{
platform_driver_unregister(&rt_mxs_auart_driver);
pr_info("Exit: Successful\n");
}
module_init(rt_mxs_auart_init);
module_exit(rt_mxs_auart_exit);
У кого-нибудь есть идея? Спасибо!