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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] domu console issue
Resolved, did not setup xen magic pages in proper mmu settings. Regards, Peng. > -----Original Message----- > From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf > Of Peng Fan > Sent: 2018年11月14日 18:22 > To: xen-devel@xxxxxxxxxxxxxxxxxxxx > Cc: Julien Grall <julien.grall@xxxxxxx>; Stefano Stabellini > <sstabellini@xxxxxxxxxx> > Subject: [Xen-devel] domu console issue > > Hi, > > I am trying to enable pv console in domu uboot without interrupt, but not > work well, When using xl console to attach domu, there are only a few chars > output. > > I add some debug info in write_console, and see out_cons are not increased > after notify_remote_by_evtchn. The write_console is taken from Linux > driver/tty/hvc/hvc_xen.c > > Any suggestions? > > Thanks, > Peng. > > struct xen_uart_priv { > struct xencons_interface *intf; > u32 evtchn; > int vtermno; > struct hvc_struct *hvc; > grant_ref_t gntref; > }; > > static int xen_serial_probe(struct udevice *dev) { > struct xen_uart_priv *priv = dev_get_priv(dev); > uint64_t v = 0; > unsigned long gfn; > int r; > > r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v); > if (r < 0 || v == 0) > return r; > > priv->evtchn= v; > > r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v); > if (r < 0 || v == 0) > return -ENODEV; > > gfn = v; > > priv->intf = (struct xencons_interface *)(gfn << XEN_PAGE_SHIFT); > if (priv->intf == NULL) > return -EINVAL; > > return 0; > } > > static int xen_serial_pending(struct udevice *dev, bool input) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > > if (!input || intf->in_cons == intf->in_prod) > return 0; > > return 1; > } > > static int xen_serial_getc(struct udevice *dev) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > XENCONS_RING_IDX cons, prod; > int recv = 0; > char c; > int num_of_bytes = 1; > > while (intf->in_cons == intf->in_prod) { > /* wait */ > mb(); > } > > cons = intf->in_cons; > prod = intf->in_prod; > mb(); /* get pointers before reading ring */ > > while (cons != prod && recv < num_of_bytes) { > c = intf->in[MASK_XENCONS_IDX(cons++, intf->in)]; > recv++; > } > > mb(); /* read ring before consuming */ > intf->in_cons = cons; > mb(); /* read ring before consuming */ > > if (recv) > notify_remote_via_evtchn(priv->evtchn); > > return c; > } > > static int __write_console(struct udevice *dev, const char *data, int len) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > XENCONS_RING_IDX cons, prod; > int sent = 0; > > cons = intf->out_cons; > prod = intf->out_prod; > asm volatile("dsb sy\r\n" : : : "memory"); > xen_raw_printk("11 %u %u\n", intf->out_cons, intf->out_prod); > > BUG_ON((prod - cons) > sizeof(intf->out)); > > while ((sent < len) && ((prod - cons) < sizeof(intf->out))) > intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = > data[sent++]; > > asm volatile("dsb sy\r\n" : : : "memory"); > intf->out_prod = prod; > xen_raw_printk("12 %u %u %d\n", intf->out_cons, intf->out_prod, > sent); > > if (sent) > notify_remote_via_evtchn(priv->evtchn); > > mdelay(1000); > asm volatile("dsb sy\r\n" : : : "memory"); > xen_raw_printk("\n"); > xen_raw_printk("%u %u %s\n", intf->out_cons, intf->out_prod, > &intf->out[MASK_XENCONS_IDX(intf->out_cons, intf->out)]); > > return sent; > } > > static int write_console(struct udevice *dev, const char *data, int len) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > int ret = len; > > /* > * Make sure the whole buffer is emitted, polling if > * necessary. We don't ever want to rely on the hvc daemon > * because the most interesting console output is when the > * kernel is crippled. > */ > while (len) { > int sent = __write_console(dev, data, len); > > data += sent; > len -= sent; > > if (unlikely(len)) > HYPERVISOR_sched_op(SCHEDOP_yield, > NULL); > HYPERVISOR_sched_op(SCHEDOP_yield, NULL); > } > > return ret; > } > > static int xen_serial_puts(struct udevice *dev, const char *str) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > XENCONS_RING_IDX cons, prod; > > int sent = 0; > int num_of_bytes = strlen(str); > > xen_raw_printk("%s", str); > > write_console(dev, str, strlen(str)); > > return 0; > } > > static int xen_serial_putc(struct udevice *dev, const char ch) { > struct xen_uart_priv *priv = dev_get_priv(dev); > struct xencons_interface *intf = priv->intf; > XENCONS_RING_IDX cons, prod; > > int sent = 0; > int num_of_bytes = 1; > > xen_raw_printk("%c", ch); > > write_console(dev, &ch, 1); > > return 0; > } > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxxx > https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists. > xenproject.org%2Fmailman%2Flistinfo%2Fxen-devel&data=02%7C01%7 > Cpeng.fan%40nxp.com%7C58d7c4ebe8da4811056708d64a1b1181%7C686ea > 1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C636777877462336257& > sdata=bLm8uKrON4RbaGFLjN%2FE0TZeedTKFPHnQkNdfRTDBD0%3D&r > eserved=0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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