Date: Thu, 30 Jul 2020 07:26:11 +0000 (UTC) From: Wei Hu <whu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363689 - head/sys/dev/hyperv/vmbus Message-ID: <202007300726.06U7QBvq084772@repo.freebsd.org>
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Author: whu Date: Thu Jul 30 07:26:11 2020 New Revision: 363689 URL: https://svnweb.freebsd.org/changeset/base/363689 Log: Prevent framebuffer mmio space from being allocated to other devices on HyperV. On Gen2 VMs, Hyper-V provides mmio space for framebuffer. This mmio address range is not useable for other PCI devices. Currently only efifb driver is using this range without reserving it from system. Therefore, vmbus driver reserves it before any other PCI device drivers start to request mmio addresses. PR: 222996 Submitted by: weh@microsoft.com Reported by: dmitry_kuleshov@ukr.net Reviewed by: decui@microsoft.com Sponsored by: Microsoft Modified: head/sys/dev/hyperv/vmbus/vmbus.c Modified: head/sys/dev/hyperv/vmbus/vmbus.c ============================================================================== --- head/sys/dev/hyperv/vmbus/vmbus.c Thu Jul 30 07:11:08 2020 (r363688) +++ head/sys/dev/hyperv/vmbus/vmbus.c Thu Jul 30 07:26:11 2020 (r363689) @@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/bus.h> #include <sys/kernel.h> +#include <sys/linker.h> #include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> @@ -46,6 +47,7 @@ __FBSDID("$FreeBSD$"); #include <machine/bus.h> #include <machine/intr_machdep.h> +#include <machine/metadata.h> #include <machine/md_var.h> #include <machine/resource.h> #include <x86/include/apicvar.h> @@ -1332,12 +1334,66 @@ vmbus_get_mmio_res(device_t dev) vmbus_get_mmio_res_pass(dev, parse_32); } +/* + * On Gen2 VMs, Hyper-V provides mmio space for framebuffer. + * This mmio address range is not useable for other PCI devices. + * Currently only efifb driver is using this range without reserving + * it from system. + * Therefore, vmbus driver reserves it before any other PCI device + * drivers start to request mmio addresses. + */ +static struct resource *hv_fb_res; + static void +vmbus_fb_mmio_res(device_t dev) +{ + struct efi_fb *efifb; + caddr_t kmdp; + + struct vmbus_softc *sc = device_get_softc(dev); + int rid = 0; + + kmdp = preload_search_by_type("elf kernel"); + if (kmdp == NULL) + kmdp = preload_search_by_type("elf64 kernel"); + efifb = (struct efi_fb *)preload_search_info(kmdp, + MODINFO_METADATA | MODINFOMD_EFI_FB); + if (efifb == NULL) { + if (bootverbose) + device_printf(dev, + "fb has no preloaded kernel efi information\n"); + /* We are on Gen1 VM, just return. */ + return; + } else { + if (bootverbose) + device_printf(dev, + "efifb: fb_addr: %#jx, size: %#jx, " + "actual size needed: 0x%x\n", + efifb->fb_addr, efifb->fb_size, + (int) efifb->fb_height * efifb->fb_width); + } + + hv_fb_res = pcib_host_res_alloc(&sc->vmbus_mmio_res, dev, + SYS_RES_MEMORY, &rid, + efifb->fb_addr, efifb->fb_addr + efifb->fb_size, efifb->fb_size, + RF_ACTIVE | rman_make_alignment_flags(PAGE_SIZE)); + + if (hv_fb_res && bootverbose) + device_printf(dev, + "successfully reserved memory for framebuffer " + "starting at %#jx, size %#jx\n", + efifb->fb_addr, efifb->fb_size); +} + +static void vmbus_free_mmio_res(device_t dev) { struct vmbus_softc *sc = device_get_softc(dev); pcib_host_res_free(dev, &sc->vmbus_mmio_res); + + if (hv_fb_res) + hv_fb_res = NULL; } #endif /* NEW_PCIB */ @@ -1387,6 +1443,7 @@ vmbus_doattach(struct vmbus_softc *sc) #ifdef NEW_PCIB vmbus_get_mmio_res(sc->vmbus_dev); + vmbus_fb_mmio_res(sc->vmbus_dev); #endif sc->vmbus_flags |= VMBUS_FLAG_ATTACHED;
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