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>
diff --git a/drivers/gpu/drm/i915/gvt/cfg_space.c b/drivers/gpu/drm/i915/gvt/cfg_space.c
new file mode 100644
index 0000000..16360e4
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/cfg_space.c
@@ -0,0 +1,287 @@
+/*
+ * 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.
+ *
+ * Authors:
+ * Eddie Dong <eddie.dong@intel.com>
+ * Jike Song <jike.song@intel.com>
+ *
+ * Contributors:
+ * Zhi Wang <zhi.a.wang@intel.com>
+ * Min He <min.he@intel.com>
+ * Bing Niu <bing.niu@intel.com>
+ *
+ */
+
+#include "i915_drv.h"
+
+enum {
+ INTEL_GVT_PCI_BAR_GTTMMIO = 0,
+ INTEL_GVT_PCI_BAR_APERTURE,
+ INTEL_GVT_PCI_BAR_PIO,
+ INTEL_GVT_PCI_BAR_MAX,
+};
+
+/**
+ * intel_vgpu_emulate_cfg_read - emulate vGPU configuration space read
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+int intel_vgpu_emulate_cfg_read(void *__vgpu, unsigned int offset,
+ void *p_data, unsigned int bytes)
+{
+ struct intel_vgpu *vgpu = __vgpu;
+
+ if (WARN_ON(bytes > 4))
+ return -EINVAL;
+
+ if (WARN_ON(offset + bytes > INTEL_GVT_MAX_CFG_SPACE_SZ))
+ return -EINVAL;
+
+ memcpy(p_data, vgpu_cfg_space(vgpu) + offset, bytes);
+ return 0;
+}
+
+static int map_aperture(struct intel_vgpu *vgpu, bool map)
+{
+ u64 first_gfn, first_mfn;
+ u64 val;
+ int ret;
+
+ if (map == vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].tracked)
+ return 0;
+
+ val = vgpu_cfg_space(vgpu)[PCI_BASE_ADDRESS_2];
+ if (val & PCI_BASE_ADDRESS_MEM_TYPE_64)
+ val = *(u64 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_2);
+ else
+ val = *(u32 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_2);
+
+ first_gfn = (val + vgpu_aperture_offset(vgpu)) >> PAGE_SHIFT;
+ first_mfn = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
+
+ ret = intel_gvt_hypervisor_map_gfn_to_mfn(vgpu, first_gfn,
+ first_mfn,
+ vgpu_aperture_sz(vgpu)
+ >> PAGE_SHIFT, map,
+ GVT_MAP_APERTURE);
+ if (ret)
+ return ret;
+
+ vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_APERTURE].tracked = map;
+ return 0;
+}
+
+static int trap_gttmmio(struct intel_vgpu *vgpu, bool trap)
+{
+ u64 start, end;
+ u64 val;
+ int ret;
+
+ if (trap == vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].tracked)
+ return 0;
+
+ val = vgpu_cfg_space(vgpu)[PCI_BASE_ADDRESS_0];
+ if (val & PCI_BASE_ADDRESS_MEM_TYPE_64)
+ start = *(u64 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_0);
+ else
+ start = *(u32 *)(vgpu_cfg_space(vgpu) + PCI_BASE_ADDRESS_0);
+
+ start &= ~GENMASK(3, 0);
+ end = start + vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].size - 1;
+
+ ret = intel_gvt_hypervisor_set_trap_area(vgpu, start, end, trap);
+ if (ret)
+ return ret;
+
+ vgpu->cfg_space.bar[INTEL_GVT_PCI_BAR_GTTMMIO].tracked = trap;
+ return 0;
+}
+
+static int emulate_pci_command_write(struct intel_vgpu *vgpu,
+ unsigned int offset, void *p_data, unsigned int bytes)
+{
+ u8 old = vgpu_cfg_space(vgpu)[offset];
+ u8 new = *(u8 *)p_data;
+ u8 changed = old ^ new;
+ int ret;
+
+ if (!(changed & PCI_COMMAND_MEMORY))
+ return 0;
+
+ if (old & PCI_COMMAND_MEMORY) {
+ ret = trap_gttmmio(vgpu, false);
+ if (ret)
+ return ret;
+ ret = map_aperture(vgpu, false);
+ if (ret)
+ return ret;
+ } else {
+ ret = trap_gttmmio(vgpu, true);
+ if (ret)
+ return ret;
+ ret = map_aperture(vgpu, true);
+ if (ret)
+ return ret;
+ }
+
+ memcpy(vgpu_cfg_space(vgpu) + offset, p_data, bytes);
+ return 0;
+}
+
+static int emulate_pci_bar_write(struct intel_vgpu *vgpu, unsigned int offset,
+ void *p_data, unsigned int bytes)
+{
+ unsigned int bar_index =
+ (rounddown(offset, 8) % PCI_BASE_ADDRESS_0) / 8;
+ u32 new = *(u32 *)(p_data);
+ bool lo = IS_ALIGNED(offset, 8);
+ u64 size;
+ int ret = 0;
+ bool mmio_enabled =
+ vgpu_cfg_space(vgpu)[PCI_COMMAND] & PCI_COMMAND_MEMORY;
+
+ if (WARN_ON(bar_index >= INTEL_GVT_PCI_BAR_MAX))
+ return -EINVAL;
+
+ if (new == 0xffffffff) {
+ /*
+ * Power-up software can determine how much address
+ * space the device requires by writing a value of
+ * all 1's to the register and then reading the value
+ * back. The device will return 0's in all don't-care
+ * address bits.
+ */
+ size = vgpu->cfg_space.bar[bar_index].size;
+ if (lo) {
+ new = rounddown(new, size);
+ } else {
+ u32 val = vgpu_cfg_space(vgpu)[rounddown(offset, 8)];
+ /* for 32bit mode bar it returns all-0 in upper 32
+ * bit, for 64bit mode bar it will calculate the
+ * size with lower 32bit and return the corresponding
+ * value
+ */
+ if (val & PCI_BASE_ADDRESS_MEM_TYPE_64)
+ new &= (~(size-1)) >> 32;
+ else
+ new = 0;
+ }
+ /*
+ * Unmapp & untrap the BAR, since guest hasn't configured a
+ * valid GPA
+ */
+ switch (bar_index) {
+ case INTEL_GVT_PCI_BAR_GTTMMIO:
+ ret = trap_gttmmio(vgpu, false);
+ break;
+ case INTEL_GVT_PCI_BAR_APERTURE:
+ ret = map_aperture(vgpu, false);
+ break;
+ }
+ intel_vgpu_write_pci_bar(vgpu, offset, new, lo);
+ } else {
+ /*
+ * Unmapp & untrap the old BAR first, since guest has
+ * re-configured the BAR
+ */
+ switch (bar_index) {
+ case INTEL_GVT_PCI_BAR_GTTMMIO:
+ ret = trap_gttmmio(vgpu, false);
+ break;
+ case INTEL_GVT_PCI_BAR_APERTURE:
+ ret = map_aperture(vgpu, false);
+ break;
+ }
+ intel_vgpu_write_pci_bar(vgpu, offset, new, lo);
+ /* Track the new BAR */
+ if (mmio_enabled) {
+ switch (bar_index) {
+ case INTEL_GVT_PCI_BAR_GTTMMIO:
+ ret = trap_gttmmio(vgpu, true);
+ break;
+ case INTEL_GVT_PCI_BAR_APERTURE:
+ ret = map_aperture(vgpu, true);
+ break;
+ }
+ }
+ }
+ return ret;
+}
+
+/**
+ * intel_vgpu_emulate_cfg_read - emulate vGPU configuration space write
+ *
+ * Returns:
+ * Zero on success, negative error code if failed.
+ */
+int intel_vgpu_emulate_cfg_write(void *__vgpu, unsigned int offset,
+ void *p_data, unsigned int bytes)
+{
+ struct intel_vgpu *vgpu = __vgpu;
+ int ret;
+
+ if (WARN_ON(bytes > 4))
+ return -EINVAL;
+
+ if (WARN_ON(offset + bytes >= INTEL_GVT_MAX_CFG_SPACE_SZ))
+ return -EINVAL;
+
+ /* First check if it's PCI_COMMAND */
+ if (IS_ALIGNED(offset, 2) && offset == PCI_COMMAND) {
+ if (WARN_ON(bytes > 2))
+ return -EINVAL;
+ return emulate_pci_command_write(vgpu, offset, p_data, bytes);
+ }
+
+ switch (rounddown(offset, 4)) {
+ case PCI_BASE_ADDRESS_0:
+ case PCI_BASE_ADDRESS_1:
+ case PCI_BASE_ADDRESS_2:
+ case PCI_BASE_ADDRESS_3:
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+ return emulate_pci_bar_write(vgpu, offset, p_data, bytes);
+
+ case INTEL_GVT_PCI_SWSCI:
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+ ret = intel_vgpu_emulate_opregion_request(vgpu, *(u32 *)p_data);
+ if (ret)
+ return ret;
+ break;
+
+ case INTEL_GVT_PCI_OPREGION:
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+ ret = intel_vgpu_init_opregion(vgpu, *(u32 *)p_data);
+ if (ret)
+ return ret;
+
+ memcpy(vgpu_cfg_space(vgpu) + offset, p_data, bytes);
+ break;
+ default:
+ memcpy(vgpu_cfg_space(vgpu) + offset, p_data, bytes);
+ break;
+ }
+ return 0;
+}