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authorZhi Wang <zhi.a.wang@intel.com>2016-07-20 08:14:38 +0300
committerZhenyu Wang <zhenyuw@linux.intel.com>2016-10-14 13:12:46 +0300
commit4d60c5fd3f8751ea751d6dc6cfe0c1620420ccf8 (patch)
treeb9825065a7318e731e1b8cf2a3302472bf300906 /drivers/gpu/drm/i915/gvt/opregion.c
parent2707e44466881d6b0a8ed05a429dcf0940c22f60 (diff)
downloadlinux-4d60c5fd3f8751ea751d6dc6cfe0c1620420ccf8.tar.xz
drm/i915/gvt: vGPU PCI configuration space virtualization
This patch introduces vGPU PCI configuration space virtualization. - Adjust the trapped GPFN(Guest Page Frame Number) window of virtual GEN PCI BAR 0 when guest initializes PCI BAR 0 address. - Emulate OpRegion when guest touches OpRegion. - Pass-through a part of aperture to guest when guest initializes aperture BAR. Signed-off-by: Zhi Wang <zhi.a.wang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/opregion.c')
-rw-r--r--drivers/gpu/drm/i915/gvt/opregion.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/opregion.c b/drivers/gpu/drm/i915/gvt/opregion.c
new file mode 100644
index 000000000000..46cc2407a0a2
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/opregion.c
@@ -0,0 +1,343 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * 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 (including the next
+ * paragraph) 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 <linux/acpi.h>
+#include "i915_drv.h"
+
+static int init_vgpu_opregion(struct intel_vgpu *vgpu, u32 gpa)
+{
+ void *host_va = vgpu->gvt->opregion.opregion_va;
+ u8 *buf;
+ int i;
+
+ if (WARN((vgpu_opregion(vgpu)->va),
+ "vgpu%d: opregion has been initialized already.\n",
+ vgpu->id))
+ return -EINVAL;
+
+ vgpu_opregion(vgpu)->va = (void *)__get_free_pages(GFP_ATOMIC |
+ GFP_DMA32 | __GFP_ZERO,
+ INTEL_GVT_OPREGION_PORDER);
+
+ if (!vgpu_opregion(vgpu)->va)
+ return -ENOMEM;
+
+ memcpy_fromio(vgpu_opregion(vgpu)->va, host_va,
+ INTEL_GVT_OPREGION_SIZE);
+
+ for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++)
+ vgpu_opregion(vgpu)->gfn[i] = (gpa >> PAGE_SHIFT) + i;
+
+ /* for unknown reason, the value in LID field is incorrect
+ * which block the windows guest, so workaround it by force
+ * setting it to "OPEN"
+ */
+ buf = (u8 *)vgpu_opregion(vgpu)->va;
+ buf[INTEL_GVT_OPREGION_CLID] = 0x3;
+
+ return 0;
+}
+
+static int map_vgpu_opregion(struct intel_vgpu *vgpu, bool map)
+{
+ u64 mfn;
+ int i, ret;
+
+ for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) {
+ mfn = intel_gvt_hypervisor_virt_to_mfn(vgpu_opregion(vgpu)
+ + i * PAGE_SIZE);
+ if (mfn == INTEL_GVT_INVALID_ADDR) {
+ gvt_err("fail to get MFN from VA\n");
+ return -EINVAL;
+ }
+ ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu,
+ vgpu_opregion(vgpu)->gfn[i],
+ mfn, 1, map, GVT_MAP_OPREGION);
+ if (ret) {
+ gvt_err("fail to map GFN to MFN, errno: %d\n", ret);
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/**
+ * intel_vgpu_clean_opregion - clean the stuff used to emulate opregion
+ * @vgpu: a vGPU
+ *
+ */
+void intel_vgpu_clean_opregion(struct intel_vgpu *vgpu)
+{
+ int i;
+
+ gvt_dbg_core("vgpu%d: clean vgpu opregion\n", vgpu->id);
+
+ if (!vgpu_opregion(vgpu)->va)
+ return;
+
+ if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_KVM) {
+ vunmap(vgpu_opregion(vgpu)->va);
+ for (i = 0; i < INTEL_GVT_OPREGION_PAGES; i++) {
+ if (vgpu_opregion(vgpu)->pages[i]) {
+ put_page(vgpu_opregion(vgpu)->pages[i]);
+ vgpu_opregion(vgpu)->pages[i] = NULL;
+ }
+ }
+ } else {
+ map_vgpu_opregion(vgpu, false);
+ free_pages((unsigned long)vgpu_opregion(vgpu)->va,
+ INTEL_GVT_OPREGION_PORDER);
+ }
+
+ vgpu_opregion(vgpu)->va = NULL;
+}
+
+/**
+ * intel_vgpu_init_opregion - initialize the stuff used to emulate opregion
+ * @vgpu: a vGPU
+ * @gpa: guest physical address of opregion
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+int intel_vgpu_init_opregion(struct intel_vgpu *vgpu, u32 gpa)
+{
+ int ret;
+
+ gvt_dbg_core("vgpu%d: init vgpu opregion\n", vgpu->id);
+
+ if (intel_gvt_host.hypervisor_type == INTEL_GVT_HYPERVISOR_XEN) {
+ gvt_dbg_core("emulate opregion from kernel\n");
+
+ ret = init_vgpu_opregion(vgpu, gpa);
+ if (ret)
+ return ret;
+
+ ret = map_vgpu_opregion(vgpu, true);
+ if (ret)
+ return ret;
+ } else {
+ gvt_dbg_core("emulate opregion from userspace\n");
+
+ /*
+ * If opregion pages are not allocated from host kenrel,
+ * most of the params are meaningless
+ */
+ ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu,
+ 0, /* not used */
+ 0, /* not used */
+ 2, /* not used */
+ 1,
+ GVT_MAP_OPREGION);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/**
+ * intel_gvt_clean_opregion - clean host opergion related stuffs
+ * @gvt: a GVT device
+ *
+ */
+void intel_gvt_clean_opregion(struct intel_gvt *gvt)
+{
+ iounmap(gvt->opregion.opregion_va);
+ gvt->opregion.opregion_va = NULL;
+}
+
+/**
+ * intel_gvt_init_opregion - initialize host opergion related stuffs
+ * @gvt: a GVT device
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+int intel_gvt_init_opregion(struct intel_gvt *gvt)
+{
+ gvt_dbg_core("init host opregion\n");
+
+ pci_read_config_dword(gvt->dev_priv->drm.pdev, INTEL_GVT_PCI_OPREGION,
+ &gvt->opregion.opregion_pa);
+
+ gvt->opregion.opregion_va = acpi_os_ioremap(gvt->opregion.opregion_pa,
+ INTEL_GVT_OPREGION_SIZE);
+ if (!gvt->opregion.opregion_va) {
+ gvt_err("fail to map host opregion\n");
+ return -EFAULT;
+ }
+ return 0;
+}
+
+#define GVT_OPREGION_FUNC(scic) \
+ ({ \
+ u32 __ret; \
+ __ret = (scic & OPREGION_SCIC_FUNC_MASK) >> \
+ OPREGION_SCIC_FUNC_SHIFT; \
+ __ret; \
+ })
+
+#define GVT_OPREGION_SUBFUNC(scic) \
+ ({ \
+ u32 __ret; \
+ __ret = (scic & OPREGION_SCIC_SUBFUNC_MASK) >> \
+ OPREGION_SCIC_SUBFUNC_SHIFT; \
+ __ret; \
+ })
+
+static const char *opregion_func_name(u32 func)
+{
+ const char *name = NULL;
+
+ switch (func) {
+ case 0 ... 3:
+ case 5:
+ case 7 ... 15:
+ name = "Reserved";
+ break;
+
+ case 4:
+ name = "Get BIOS Data";
+ break;
+
+ case 6:
+ name = "System BIOS Callbacks";
+ break;
+
+ default:
+ name = "Unknown";
+ break;
+ }
+ return name;
+}
+
+static const char *opregion_subfunc_name(u32 subfunc)
+{
+ const char *name = NULL;
+
+ switch (subfunc) {
+ case 0:
+ name = "Supported Calls";
+ break;
+
+ case 1:
+ name = "Requested Callbacks";
+ break;
+
+ case 2 ... 3:
+ case 8 ... 9:
+ name = "Reserved";
+ break;
+
+ case 5:
+ name = "Boot Display";
+ break;
+
+ case 6:
+ name = "TV-Standard/Video-Connector";
+ break;
+
+ case 7:
+ name = "Internal Graphics";
+ break;
+
+ case 10:
+ name = "Spread Spectrum Clocks";
+ break;
+
+ case 11:
+ name = "Get AKSV";
+ break;
+
+ default:
+ name = "Unknown";
+ break;
+ }
+ return name;
+};
+
+static bool querying_capabilities(u32 scic)
+{
+ u32 func, subfunc;
+
+ func = GVT_OPREGION_FUNC(scic);
+ subfunc = GVT_OPREGION_SUBFUNC(scic);
+
+ if ((func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
+ subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)
+ || (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSDATA &&
+ subfunc == INTEL_GVT_OPREGION_SCIC_SF_REQEUSTEDCALLBACKS)
+ || (func == INTEL_GVT_OPREGION_SCIC_F_GETBIOSCALLBACKS &&
+ subfunc == INTEL_GVT_OPREGION_SCIC_SF_SUPPRTEDCALLS)) {
+ return true;
+ }
+ return false;
+}
+
+/**
+ * intel_vgpu_emulate_opregion_request - emulating OpRegion request
+ * @vgpu: a vGPU
+ * @swsci: SWSCI request
+ *
+ * Returns:
+ * Zero on success, negative error code if failed
+ */
+int intel_vgpu_emulate_opregion_request(struct intel_vgpu *vgpu, u32 swsci)
+{
+ u32 *scic, *parm;
+ u32 func, subfunc;
+
+ scic = vgpu_opregion(vgpu)->va + INTEL_GVT_OPREGION_SCIC;
+ parm = vgpu_opregion(vgpu)->va + INTEL_GVT_OPREGION_PARM;
+
+ if (!(swsci & SWSCI_SCI_SELECT)) {
+ gvt_err("vgpu%d: requesting SMI service\n", vgpu->id);
+ return 0;
+ }
+ /* ignore non 0->1 trasitions */
+ if ((vgpu_cfg_space(vgpu)[INTEL_GVT_PCI_SWSCI]
+ & SWSCI_SCI_TRIGGER) ||
+ !(swsci & SWSCI_SCI_TRIGGER)) {
+ return 0;
+ }
+
+ func = GVT_OPREGION_FUNC(*scic);
+ subfunc = GVT_OPREGION_SUBFUNC(*scic);
+ if (!querying_capabilities(*scic)) {
+ gvt_err("vgpu%d: requesting runtime service: func \"%s\","
+ " subfunc \"%s\"\n",
+ vgpu->id,
+ opregion_func_name(func),
+ opregion_subfunc_name(subfunc));
+ /*
+ * emulate exit status of function call, '0' means
+ * "failure, generic, unsupported or unknown cause"
+ */
+ *scic &= ~OPREGION_SCIC_EXIT_MASK;
+ return 0;
+ }
+
+ *scic = 0;
+ *parm = 0;
+ return 0;
+}