[Intel-gfx] [RFC PATCH 6/6] drm/i915/gvt: support QEMU getting the dmabuf
Xiaoguang Chen
xiaoguang.chen at intel.com
Fri Apr 28 09:35:30 UTC 2017
GVT-g will create an anonymous fd and a vfio device region to deliver
the fd to QEMU.
QEMU can do ioctl using this fd to query/generate dmabuf on an intel vgpu.
Signed-off-by: Xiaoguang Chen <xiaoguang.chen at intel.com>
---
drivers/gpu/drm/i915/gvt/gvt.c | 2 +
drivers/gpu/drm/i915/gvt/gvt.h | 2 +
drivers/gpu/drm/i915/gvt/kvmgt.c | 109 +++++++++++++++++++++++++++++++++++++++
include/uapi/linux/vfio.h | 1 +
4 files changed, 114 insertions(+)
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 7dea5e5..c266d31 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -54,6 +54,8 @@
.vgpu_reset = intel_gvt_reset_vgpu,
.vgpu_activate = intel_gvt_activate_vgpu,
.vgpu_deactivate = intel_gvt_deactivate_vgpu,
+ .vgpu_query_dmabuf = intel_vgpu_query_dmabuf,
+ .vgpu_generate_dmabuf = intel_vgpu_generate_dmabuf,
};
/**
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 763a8c5..2733a69 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -467,6 +467,8 @@ struct intel_gvt_ops {
void (*vgpu_reset)(struct intel_vgpu *);
void (*vgpu_activate)(struct intel_vgpu *);
void (*vgpu_deactivate)(struct intel_vgpu *);
+ int (*vgpu_query_dmabuf)(struct intel_vgpu *, void *);
+ int (*vgpu_generate_dmabuf)(struct intel_vgpu *, void *);
};
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 389f072..beb5356 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -41,6 +41,7 @@
#include <linux/kvm_host.h>
#include <linux/vfio.h>
#include <linux/mdev.h>
+#include <linux/anon_inodes.h>
#include "i915_drv.h"
#include "gvt.h"
@@ -524,6 +525,106 @@ static int intel_vgpu_reg_init_opregion(struct intel_vgpu *vgpu)
return ret;
}
+static int intel_vgpu_gvtg_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ WARN_ON(1);
+
+ return 0;
+}
+
+static int intel_vgpu_gvtg_release(struct inode *inode, struct file *filp)
+{
+ return 0;
+}
+
+static long intel_vgpu_gvtg_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct intel_vgpu *vgpu = filp->private_data;
+ int minsz;
+ struct intel_vgpu_dmabuf dmabuf;
+ int ret;
+
+ minsz = offsetofend(struct intel_vgpu_dmabuf, y_pos);
+ if (copy_from_user(&dmabuf, (void __user *)arg, minsz))
+ return -EFAULT;
+ if (ioctl == INTEL_VGPU_QUERY_DMABUF)
+ ret = intel_gvt_ops->vgpu_query_dmabuf(vgpu, &dmabuf);
+ else if (ioctl == INTEL_VGPU_GENERATE_DMABUF)
+ ret = intel_gvt_ops->vgpu_generate_dmabuf(vgpu, &dmabuf);
+ else {
+ gvt_vgpu_err("unsupported dmabuf operation\n");
+ return -EINVAL;
+ }
+
+ if (ret != 0) {
+ gvt_vgpu_err("gvt-g get dmabuf failed:%d\n", ret);
+ return -EINVAL;
+ }
+
+ return copy_to_user((void __user *)arg, &dmabuf, minsz) ? -EFAULT : 0;
+}
+
+static const struct file_operations intel_vgpu_gvtg_ops = {
+ .release = intel_vgpu_gvtg_release,
+ .unlocked_ioctl = intel_vgpu_gvtg_ioctl,
+ .mmap = intel_vgpu_gvtg_mmap,
+ .llseek = noop_llseek,
+};
+
+static size_t intel_vgpu_reg_rw_gvtg(struct intel_vgpu *vgpu, char *buf,
+ size_t count, loff_t *ppos, bool iswrite)
+{
+ unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) -
+ VFIO_PCI_NUM_REGIONS;
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+ int fd;
+
+ if (pos >= vgpu->vdev.region[i].size || iswrite) {
+ gvt_vgpu_err("invalid op or offset for Intel vgpu fd region\n");
+ return -EINVAL;
+ }
+
+ fd = anon_inode_getfd("gvtg", &intel_vgpu_gvtg_ops, vgpu,
+ O_RDWR | O_CLOEXEC);
+ if (fd < 0) {
+ gvt_vgpu_err("create intel vgpu fd failed:%d\n", fd);
+ return -EINVAL;
+ }
+
+ count = min(count, (size_t)(vgpu->vdev.region[i].size - pos));
+ memcpy(buf, &fd, count);
+
+ return count;
+}
+
+static void intel_vgpu_reg_release_gvtg(struct intel_vgpu *vgpu,
+ struct vfio_region *region)
+{
+}
+
+static const struct intel_vgpu_regops intel_vgpu_regops_gvtg = {
+ .rw = intel_vgpu_reg_rw_gvtg,
+ .release = intel_vgpu_reg_release_gvtg,
+};
+
+static int intel_vgpu_reg_init_gvtg(struct intel_vgpu *vgpu)
+{
+ int ret;
+
+ ret = intel_vgpu_register_reg(vgpu,
+ PCI_VENDOR_ID_INTEL | VFIO_REGION_TYPE_PCI_VENDOR_TYPE,
+ VFIO_REGION_SUBTYPE_INTEL_IGD_GVTG,
+ &intel_vgpu_regops_gvtg, sizeof(int),
+ VFIO_REGION_INFO_FLAG_READ, NULL);
+ if (ret) {
+ gvt_vgpu_err("failed to register gvtg region:%d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = NULL;
@@ -564,6 +665,14 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
gvt_dbg_core("create OpRegion succeeded for mdev:%s\n",
dev_name(mdev_dev(mdev)));
+ ret = intel_vgpu_reg_init_gvtg(vgpu);
+ if (ret) {
+ gvt_vgpu_err("create gvtg region failed\n");
+ goto out;
+ }
+ gvt_dbg_core("create gvtg region succeeded for mdev:%s\n",
+ dev_name(mdev_dev(mdev)));
+
gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
dev_name(mdev_dev(mdev)));
ret = 0;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 519eff3..96d2c58 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -297,6 +297,7 @@ struct vfio_region_info_cap_type {
#define VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION (1)
#define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG (2)
#define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG (3)
+#define VFIO_REGION_SUBTYPE_INTEL_IGD_GVTG (4)
/**
* VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
--
1.9.1
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