e8b145c2ba
BAR could be allocated twice by different children of a vgapci0 device. To fix this, change the vgapci0 device to track references on its associated resources so that they are only allocated once from the parent PCI bus and released when no children are using them. Previously this leaked a small amount of KVA on at least some architectures.
429 lines
11 KiB
C
429 lines
11 KiB
C
/*-
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* Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Simple driver for PCI VGA display devices. Drivers such as agp(4) and
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* drm(4) should attach as children of this device.
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*
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* XXX: The vgapci name is a hack until we somehow merge the isa vga driver
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* in or rename it.
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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struct vga_resource {
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struct resource *vr_res;
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int vr_refs;
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};
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struct vga_pci_softc {
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device_t vga_msi_child; /* Child driver using MSI. */
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struct vga_resource vga_res[PCIR_MAX_BAR_0 + 1];
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};
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static int
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vga_pci_probe(device_t dev)
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{
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switch (pci_get_class(dev)) {
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case PCIC_DISPLAY:
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break;
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case PCIC_OLD:
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if (pci_get_subclass(dev) != PCIS_OLD_VGA)
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return (ENXIO);
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break;
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default:
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return (ENXIO);
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}
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device_set_desc(dev, "VGA-compatible display");
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return (BUS_PROBE_GENERIC);
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}
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static int
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vga_pci_attach(device_t dev)
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{
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bus_generic_probe(dev);
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/* Always create a drm child for now to make it easier on drm. */
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device_add_child(dev, "drm", -1);
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bus_generic_attach(dev);
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return (0);
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}
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static int
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vga_pci_suspend(device_t dev)
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{
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return (bus_generic_suspend(dev));
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}
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static int
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vga_pci_resume(device_t dev)
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{
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return (bus_generic_resume(dev));
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}
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/* Bus interface. */
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static int
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vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
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}
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static int
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vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
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{
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return (EINVAL);
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}
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static int
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vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq,
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int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg,
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void **cookiep)
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{
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return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags,
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filter, intr, arg, cookiep));
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}
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static int
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vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
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void *cookie)
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{
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return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie));
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}
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static struct resource *
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vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags)
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{
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struct vga_pci_softc *sc;
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int bar;
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switch (type) {
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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/*
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* For BARs, we cache the resource so that we only allocate it
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* from the PCI bus once.
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*/
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bar = PCI_RID2BAR(*rid);
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if (bar < 0 || bar > PCIR_MAX_BAR_0)
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return (NULL);
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sc = device_get_softc(dev);
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if (sc->vga_res[bar].vr_res == NULL)
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sc->vga_res[bar].vr_res = bus_alloc_resource(dev, type,
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rid, start, end, count, flags);
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if (sc->vga_res[bar].vr_res != NULL)
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sc->vga_res[bar].vr_refs++;
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return (sc->vga_res[bar].vr_res);
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}
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return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
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}
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static int
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vga_pci_release_resource(device_t dev, device_t child, int type, int rid,
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struct resource *r)
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{
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struct vga_pci_softc *sc;
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int bar, error;
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switch (type) {
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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/*
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* For BARs, we release the resource from the PCI bus
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* when the last child reference goes away.
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*/
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bar = PCI_RID2BAR(rid);
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if (bar < 0 || bar > PCIR_MAX_BAR_0)
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return (EINVAL);
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sc = device_get_softc(dev);
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if (sc->vga_res[bar].vr_res == NULL)
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return (EINVAL);
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KASSERT(sc->vga_res[bar].vr_res == r,
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("vga_pci resource mismatch"));
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if (sc->vga_res[bar].vr_refs > 1) {
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sc->vga_res[bar].vr_refs--;
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return (0);
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}
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KASSERT(sc->vga_res[bar].vr_refs > 0,
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("vga_pci resource reference count underflow"));
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error = bus_release_resource(dev, type, rid, r);
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if (error == 0) {
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sc->vga_res[bar].vr_res = NULL;
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sc->vga_res[bar].vr_refs = 0;
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}
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return (error);
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}
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return (bus_release_resource(dev, type, rid, r));
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}
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/* PCI interface. */
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static uint32_t
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vga_pci_read_config(device_t dev, device_t child, int reg, int width)
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{
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return (pci_read_config(dev, reg, width));
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}
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static void
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vga_pci_write_config(device_t dev, device_t child, int reg,
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uint32_t val, int width)
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{
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pci_write_config(dev, reg, val, width);
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}
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static int
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vga_pci_enable_busmaster(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_enable_busmaster\n",
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device_get_nameunit(child));
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return (pci_enable_busmaster(dev));
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}
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static int
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vga_pci_disable_busmaster(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_disable_busmaster\n",
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device_get_nameunit(child));
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return (pci_disable_busmaster(dev));
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}
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static int
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vga_pci_enable_io(device_t dev, device_t child, int space)
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{
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device_printf(dev, "child %s requested pci_enable_io\n",
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device_get_nameunit(child));
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return (pci_enable_io(dev, space));
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}
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static int
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vga_pci_disable_io(device_t dev, device_t child, int space)
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{
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device_printf(dev, "child %s requested pci_disable_io\n",
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device_get_nameunit(child));
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return (pci_disable_io(dev, space));
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}
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static int
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vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr)
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{
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return (pci_get_vpd_ident(dev, identptr));
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}
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static int
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vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw,
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const char **vptr)
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{
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return (pci_get_vpd_readonly(dev, kw, vptr));
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}
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static int
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vga_pci_set_powerstate(device_t dev, device_t child, int state)
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{
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device_printf(dev, "child %s requested pci_set_powerstate\n",
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device_get_nameunit(child));
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return (pci_set_powerstate(dev, state));
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}
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static int
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vga_pci_get_powerstate(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_get_powerstate\n",
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device_get_nameunit(child));
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return (pci_get_powerstate(dev));
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}
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static int
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vga_pci_assign_interrupt(device_t dev, device_t child)
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{
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device_printf(dev, "child %s requested pci_assign_interrupt\n",
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device_get_nameunit(child));
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return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
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}
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static int
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vga_pci_find_extcap(device_t dev, device_t child, int capability,
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int *capreg)
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{
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return (pci_find_extcap(dev, capability, capreg));
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}
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static int
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vga_pci_alloc_msi(device_t dev, device_t child, int *count)
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{
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struct vga_pci_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if (sc->vga_msi_child != NULL)
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return (EBUSY);
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error = pci_alloc_msi(dev, count);
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if (error == 0)
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sc->vga_msi_child = child;
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return (error);
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}
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static int
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vga_pci_alloc_msix(device_t dev, device_t child, int *count)
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{
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struct vga_pci_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if (sc->vga_msi_child != NULL)
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return (EBUSY);
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error = pci_alloc_msix(dev, count);
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if (error == 0)
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sc->vga_msi_child = child;
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return (error);
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}
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static int
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vga_pci_remap_msix(device_t dev, device_t child, int count,
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const u_int *vectors)
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{
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struct vga_pci_softc *sc;
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sc = device_get_softc(dev);
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if (sc->vga_msi_child != child)
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return (ENXIO);
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return (pci_remap_msix(dev, count, vectors));
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}
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static int
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vga_pci_release_msi(device_t dev, device_t child)
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{
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struct vga_pci_softc *sc;
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int error;
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sc = device_get_softc(dev);
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if (sc->vga_msi_child != child)
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return (ENXIO);
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error = pci_release_msi(dev);
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if (error == 0)
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sc->vga_msi_child = NULL;
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return (error);
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}
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static int
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vga_pci_msi_count(device_t dev, device_t child)
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{
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return (pci_msi_count(dev));
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}
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static int
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vga_pci_msix_count(device_t dev, device_t child)
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{
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return (pci_msix_count(dev));
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}
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static device_method_t vga_pci_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, vga_pci_probe),
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DEVMETHOD(device_attach, vga_pci_attach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, vga_pci_suspend),
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DEVMETHOD(device_resume, vga_pci_resume),
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/* Bus interface */
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DEVMETHOD(bus_read_ivar, vga_pci_read_ivar),
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DEVMETHOD(bus_write_ivar, vga_pci_write_ivar),
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DEVMETHOD(bus_setup_intr, vga_pci_setup_intr),
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DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr),
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DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource),
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DEVMETHOD(bus_release_resource, vga_pci_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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/* PCI interface */
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DEVMETHOD(pci_read_config, vga_pci_read_config),
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DEVMETHOD(pci_write_config, vga_pci_write_config),
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DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster),
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DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster),
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DEVMETHOD(pci_enable_io, vga_pci_enable_io),
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DEVMETHOD(pci_disable_io, vga_pci_disable_io),
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DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident),
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DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly),
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DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate),
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DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate),
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DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt),
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DEVMETHOD(pci_find_extcap, vga_pci_find_extcap),
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DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi),
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DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix),
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DEVMETHOD(pci_remap_msix, vga_pci_remap_msix),
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DEVMETHOD(pci_release_msi, vga_pci_release_msi),
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DEVMETHOD(pci_msi_count, vga_pci_msi_count),
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DEVMETHOD(pci_msix_count, vga_pci_msix_count),
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{ 0, 0 }
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};
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static driver_t vga_pci_driver = {
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"vgapci",
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vga_pci_methods,
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sizeof(struct vga_pci_softc),
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};
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static devclass_t vga_devclass;
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DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0);
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