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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH-for-5.0 v3 5/6] hw/pci-host/i440fx: Extract the IGD passthrough host bridge device
We can use a i440FX without the IGD passthrough host bridge.
Extract it into a new file, 'hw/pci-host/igd_pt.c'.
Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
v3:
- Rename as 'xen_igd_pt.c' (Alex Williamson)
- Add an entry in MAINTAINERS::Xen
---
hw/pci-host/i440fx.c | 84 --------------------------
hw/pci-host/xen_igd_pt.c | 120 ++++++++++++++++++++++++++++++++++++++
MAINTAINERS | 1 +
hw/pci-host/Makefile.objs | 1 +
4 files changed, 122 insertions(+), 84 deletions(-)
create mode 100644 hw/pci-host/xen_igd_pt.c
diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
index 414138595b..bae7b42327 100644
--- a/hw/pci-host/i440fx.c
+++ b/hw/pci-host/i440fx.c
@@ -368,89 +368,6 @@ static const TypeInfo i440fx_info = {
},
};
-/* IGD Passthrough Host Bridge. */
-typedef struct {
- uint8_t offset;
- uint8_t len;
-} IGDHostInfo;
-
-/* Here we just expose minimal host bridge offset subset. */
-static const IGDHostInfo igd_host_bridge_infos[] = {
- {PCI_REVISION_ID, 2},
- {PCI_SUBSYSTEM_VENDOR_ID, 2},
- {PCI_SUBSYSTEM_ID, 2},
- {0x50, 2}, /* SNB: processor graphics control register
*/
- {0x52, 2}, /* processor graphics control register */
- {0xa4, 4}, /* SNB: graphics base of stolen memory */
- {0xa8, 4}, /* SNB: base of GTT stolen memory */
-};
-
-static void host_pci_config_read(int pos, int len, uint32_t *val, Error **errp)
-{
- int rc, config_fd;
- /* Access real host bridge. */
- char *path = g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
- 0, 0, 0, 0, "config");
-
- config_fd = open(path, O_RDWR);
- if (config_fd < 0) {
- error_setg_errno(errp, errno, "Failed to open: %s", path);
- goto out;
- }
-
- if (lseek(config_fd, pos, SEEK_SET) != pos) {
- error_setg_errno(errp, errno, "Failed to seek: %s", path);
- goto out_close_fd;
- }
-
- do {
- rc = read(config_fd, (uint8_t *)val, len);
- } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
- if (rc != len) {
- error_setg_errno(errp, errno, "Failed to read: %s", path);
- }
-
-out_close_fd:
- close(config_fd);
-out:
- g_free(path);
-}
-
-static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp)
-{
- uint32_t val = 0;
- size_t i;
- int pos, len;
- Error *local_err = NULL;
-
- for (i = 0; i < ARRAY_SIZE(igd_host_bridge_infos); i++) {
- pos = igd_host_bridge_infos[i].offset;
- len = igd_host_bridge_infos[i].len;
- host_pci_config_read(pos, len, &val, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- return;
- }
- pci_default_write_config(pci_dev, pos, val, len);
- }
-}
-
-static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
-{
- DeviceClass *dc = DEVICE_CLASS(klass);
- PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
- k->realize = igd_pt_i440fx_realize;
- dc->desc = "IGD Passthrough Host bridge";
-}
-
-static const TypeInfo igd_passthrough_i440fx_info = {
- .name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
- .parent = TYPE_I440FX_PCI_DEVICE,
- .instance_size = sizeof(PCII440FXState),
- .class_init = igd_passthrough_i440fx_class_init,
-};
-
static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
@@ -495,7 +412,6 @@ static const TypeInfo i440fx_pcihost_info = {
static void i440fx_register_types(void)
{
type_register_static(&i440fx_info);
- type_register_static(&igd_passthrough_i440fx_info);
type_register_static(&i440fx_pcihost_info);
}
diff --git a/hw/pci-host/xen_igd_pt.c b/hw/pci-host/xen_igd_pt.c
new file mode 100644
index 0000000000..efcc9347ff
--- /dev/null
+++ b/hw/pci-host/xen_igd_pt.c
@@ -0,0 +1,120 @@
+/*
+ * QEMU Intel IGD Passthrough Host Bridge Emulation
+ *
+ * Copyright (c) 2006 Fabrice Bellard
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_host.h"
+#include "hw/pci-host/i440fx.h"
+#include "qapi/error.h"
+
+typedef struct {
+ uint8_t offset;
+ uint8_t len;
+} IGDHostInfo;
+
+/* Here we just expose minimal host bridge offset subset. */
+static const IGDHostInfo igd_host_bridge_infos[] = {
+ {PCI_REVISION_ID, 2},
+ {PCI_SUBSYSTEM_VENDOR_ID, 2},
+ {PCI_SUBSYSTEM_ID, 2},
+ {0x50, 2}, /* SNB: processor graphics control register
*/
+ {0x52, 2}, /* processor graphics control register */
+ {0xa4, 4}, /* SNB: graphics base of stolen memory */
+ {0xa8, 4}, /* SNB: base of GTT stolen memory */
+};
+
+static void host_pci_config_read(int pos, int len, uint32_t *val, Error **errp)
+{
+ int rc, config_fd;
+ /* Access real host bridge. */
+ char *path = g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
+ 0, 0, 0, 0, "config");
+
+ config_fd = open(path, O_RDWR);
+ if (config_fd < 0) {
+ error_setg_errno(errp, errno, "Failed to open: %s", path);
+ goto out;
+ }
+
+ if (lseek(config_fd, pos, SEEK_SET) != pos) {
+ error_setg_errno(errp, errno, "Failed to seek: %s", path);
+ goto out_close_fd;
+ }
+
+ do {
+ rc = read(config_fd, (uint8_t *)val, len);
+ } while (rc < 0 && (errno == EINTR || errno == EAGAIN));
+ if (rc != len) {
+ error_setg_errno(errp, errno, "Failed to read: %s", path);
+ }
+
+ out_close_fd:
+ close(config_fd);
+ out:
+ g_free(path);
+}
+
+static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp)
+{
+ uint32_t val = 0;
+ size_t i;
+ int pos, len;
+ Error *local_err = NULL;
+
+ for (i = 0; i < ARRAY_SIZE(igd_host_bridge_infos); i++) {
+ pos = igd_host_bridge_infos[i].offset;
+ len = igd_host_bridge_infos[i].len;
+ host_pci_config_read(pos, len, &val, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+ pci_default_write_config(pci_dev, pos, val, len);
+ }
+}
+
+static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->realize = igd_pt_i440fx_realize;
+ dc->desc = "IGD Passthrough Host bridge";
+}
+
+static const TypeInfo igd_passthrough_i440fx_info = {
+ .name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
+ .parent = TYPE_I440FX_PCI_DEVICE,
+ .instance_size = sizeof(PCII440FXState),
+ .class_init = igd_passthrough_i440fx_class_init,
+};
+
+static void igd_pt_i440fx_register_types(void)
+{
+ type_register_static(&igd_passthrough_i440fx_info);
+}
+
+type_init(igd_pt_i440fx_register_types)
diff --git a/MAINTAINERS b/MAINTAINERS
index 5e5e3e52d6..62bcf5e94e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -419,6 +419,7 @@ F: hw/block/dataplane/xen*
F: hw/xen/
F: hw/xenpv/
F: hw/i386/xen/
+F: hw/pci-host/xen_igd_pt.c
F: include/hw/block/dataplane/xen*
F: include/hw/xen/
F: include/sysemu/xen-mapcache.h
diff --git a/hw/pci-host/Makefile.objs b/hw/pci-host/Makefile.objs
index efd752b766..fa6d1556c0 100644
--- a/hw/pci-host/Makefile.objs
+++ b/hw/pci-host/Makefile.objs
@@ -14,6 +14,7 @@ common-obj-$(CONFIG_VERSATILE_PCI) += versatile.o
common-obj-$(CONFIG_PCI_SABRE) += sabre.o
common-obj-$(CONFIG_FULONG) += bonito.o
common-obj-$(CONFIG_PCI_I440FX) += i440fx.o
+common-obj-$(CONFIG_PCI_I440FX) += xen_igd_pt.o
common-obj-$(CONFIG_PCI_EXPRESS_Q35) += q35.o
common-obj-$(CONFIG_PCI_EXPRESS_GENERIC_BRIDGE) += gpex.o
common-obj-$(CONFIG_PCI_EXPRESS_XILINX) += xilinx-pcie.o
--
2.21.0
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