From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/usb/host/ehci-grlib.c | 177 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 drivers/usb/host/ehci-grlib.c (limited to 'drivers/usb/host/ehci-grlib.c') diff --git a/drivers/usb/host/ehci-grlib.c b/drivers/usb/host/ehci-grlib.c new file mode 100644 index 000000000..bd9762eaa --- /dev/null +++ b/drivers/usb/host/ehci-grlib.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Aeroflex Gaisler GRLIB GRUSBHC EHCI host controller + * + * GRUSBHC is typically found on LEON/GRLIB SoCs + * + * (c) Jan Andersson + * + * Based on ehci-ppc-of.c which is: + * (c) Valentine Barshak + * and in turn based on "ehci-ppc-soc.c" by Stefan Roese + * and "ohci-ppc-of.c" by Sylvain Munaut + */ + +#include +#include + +#include +#include +#include + +#define GRUSBHC_HCIVERSION 0x0100 /* Known value of cap. reg. HCIVERSION */ + +static const struct hc_driver ehci_grlib_hc_driver = { + .description = hcd_name, + .product_desc = "GRLIB GRUSBHC EHCI", + .hcd_priv_size = sizeof(struct ehci_hcd), + + /* + * generic hardware linkage + */ + .irq = ehci_irq, + .flags = HCD_MEMORY | HCD_DMA | HCD_USB2 | HCD_BH, + + /* + * basic lifecycle operations + */ + .reset = ehci_setup, + .start = ehci_run, + .stop = ehci_stop, + .shutdown = ehci_shutdown, + + /* + * managing i/o requests and associated device resources + */ + .urb_enqueue = ehci_urb_enqueue, + .urb_dequeue = ehci_urb_dequeue, + .endpoint_disable = ehci_endpoint_disable, + .endpoint_reset = ehci_endpoint_reset, + + /* + * scheduling support + */ + .get_frame_number = ehci_get_frame, + + /* + * root hub support + */ + .hub_status_data = ehci_hub_status_data, + .hub_control = ehci_hub_control, +#ifdef CONFIG_PM + .bus_suspend = ehci_bus_suspend, + .bus_resume = ehci_bus_resume, +#endif + .relinquish_port = ehci_relinquish_port, + .port_handed_over = ehci_port_handed_over, + + .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, +}; + + +static int ehci_hcd_grlib_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct usb_hcd *hcd; + struct ehci_hcd *ehci = NULL; + struct resource res; + u32 hc_capbase; + int irq; + int rv; + + if (usb_disabled()) + return -ENODEV; + + dev_dbg(&op->dev, "initializing GRUSBHC EHCI USB Controller\n"); + + rv = of_address_to_resource(dn, 0, &res); + if (rv) + return rv; + + /* usb_create_hcd requires dma_mask != NULL */ + op->dev.dma_mask = &op->dev.coherent_dma_mask; + hcd = usb_create_hcd(&ehci_grlib_hc_driver, &op->dev, + "GRUSBHC EHCI USB"); + if (!hcd) + return -ENOMEM; + + hcd->rsrc_start = res.start; + hcd->rsrc_len = resource_size(&res); + + irq = irq_of_parse_and_map(dn, 0); + if (!irq) { + dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n", + __FILE__); + rv = -EBUSY; + goto err_irq; + } + + hcd->regs = devm_ioremap_resource(&op->dev, &res); + if (IS_ERR(hcd->regs)) { + rv = PTR_ERR(hcd->regs); + goto err_ioremap; + } + + ehci = hcd_to_ehci(hcd); + + ehci->caps = hcd->regs; + + /* determine endianness of this implementation */ + hc_capbase = ehci_readl(ehci, &ehci->caps->hc_capbase); + if (HC_VERSION(ehci, hc_capbase) != GRUSBHC_HCIVERSION) { + ehci->big_endian_mmio = 1; + ehci->big_endian_desc = 1; + ehci->big_endian_capbase = 1; + } + + rv = usb_add_hcd(hcd, irq, 0); + if (rv) + goto err_ioremap; + + device_wakeup_enable(hcd->self.controller); + return 0; + +err_ioremap: + irq_dispose_mapping(irq); +err_irq: + usb_put_hcd(hcd); + + return rv; +} + + +static void ehci_hcd_grlib_remove(struct platform_device *op) +{ + struct usb_hcd *hcd = platform_get_drvdata(op); + + dev_dbg(&op->dev, "stopping GRLIB GRUSBHC EHCI USB Controller\n"); + + usb_remove_hcd(hcd); + + irq_dispose_mapping(hcd->irq); + + usb_put_hcd(hcd); +} + + +static const struct of_device_id ehci_hcd_grlib_of_match[] = { + { + .name = "GAISLER_EHCI", + }, + { + .name = "01_026", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, ehci_hcd_grlib_of_match); + + +static struct platform_driver ehci_grlib_driver = { + .probe = ehci_hcd_grlib_probe, + .remove = ehci_hcd_grlib_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "grlib-ehci", + .of_match_table = ehci_hcd_grlib_of_match, + }, +}; -- cgit v1.3.1