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Message-Id: <20220127120508.11330-2-zhi.a.wang@intel.com>
Date: Thu, 27 Jan 2022 07:05:07 -0500
From: Zhi Wang <zhi.wang.linux@...il.com>
To: hch@....de, jgg@...dia.com, jani.nikula@...ux.intel.com
Cc: intel-gfx@...ts.freedesktop.org,
intel-gvt-dev@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Zhi Wang <zhi.a.wang@...el.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Vivi Rodrigo <rodrigo.vivi@...el.com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: [PATCH 2/3] i915/gvt: save the initial HW state snapshot in i915.
Save the inital HW state snapshot in i915 so that the rest code of GVT-g
can be moved into a dedicated module while it can still get a clean
initial HW state saved at the correct time during the initialization of
i915. The futhrer vGPU created by GVT-g will use this HW state as the
initial HW state.
Cc: Christoph Hellwig <hch@....de>
Cc: Jason Gunthorpe <jgg@...dia.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Vivi Rodrigo <rodrigo.vivi@...el.com>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc: Zhi Wang <zhi.a.wang@...el.com>
Signed-off-by: Zhi Wang <zhi.a.wang@...el.com>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +
drivers/gpu/drm/i915/intel_gvt.c | 110 ++++++++++++++++++++++++++++++-
2 files changed, 110 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 44c1f98144b4..2a230840cdfa 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -606,6 +606,8 @@ struct i915_virtual_gpu {
struct mutex lock; /* serialises sending of g2v_notify command pkts */
bool active;
u32 caps;
+ u32 *initial_mmio;
+ u8 *initial_cfg_space;
};
struct i915_selftest_stash {
diff --git a/drivers/gpu/drm/i915/intel_gvt.c b/drivers/gpu/drm/i915/intel_gvt.c
index cf6e98962d82..a3d8bdb24d3f 100644
--- a/drivers/gpu/drm/i915/intel_gvt.c
+++ b/drivers/gpu/drm/i915/intel_gvt.c
@@ -86,6 +86,103 @@ void intel_gvt_sanitize_options(struct drm_i915_private *dev_priv)
dev_priv->params.enable_gvt = 0;
}
+static void free_initial_hw_state(struct drm_i915_private *dev_priv)
+{
+ struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
+
+ vfree(vgpu->initial_mmio);
+ vgpu->initial_mmio = NULL;
+
+ kfree(vgpu->initial_cfg_space);
+ vgpu->initial_cfg_space = NULL;
+}
+
+static void save_mmio(struct intel_gvt_mmio_table_iter *iter, u32 offset,
+ u32 size)
+{
+ struct drm_i915_private *dev_priv = iter->i915;
+ void *mmio = iter->data;
+ u32 start, end, i;
+
+ start = offset;
+ end = offset + size;
+
+ for (i = start; i < end; i += 4) {
+ *(u32 *)(mmio + i) = intel_uncore_read_notrace(
+ to_gt(dev_priv)->uncore, _MMIO(offset));
+ }
+}
+
+static int do_mmio(u32 offset, u16 flags, u32 size, u32 addr_mask,
+ u32 ro_mask, u32 device,
+ struct intel_gvt_mmio_table_iter *iter)
+{
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+
+ save_mmio(iter, offset, size);
+ return 0;
+}
+
+static int do_mmio_block(u32 offset, u32 size, u32 device,
+ struct intel_gvt_mmio_table_iter *iter)
+{
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+
+ save_mmio(iter, offset, size);
+ return 0;
+}
+
+static int save_inital_hw_state(struct drm_i915_private *dev_priv)
+{
+ struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
+ struct intel_gvt_device_info info;
+ struct i915_virtual_gpu *vgpu = &dev_priv->vgpu;
+ struct intel_gvt_mmio_table_iter iter;
+ void *mem;
+ int i, ret;
+
+ intel_gvt_init_device_info(dev_priv, &info);
+
+ mem = kzalloc(info.cfg_space_size, GFP_KERNEL);
+ if (!mem)
+ return -ENOMEM;
+
+ vgpu->initial_cfg_space = mem;
+
+ for (i = 0; i < PCI_CFG_SPACE_EXP_SIZE; i += 4)
+ pci_read_config_dword(pdev, i, mem + i);
+
+ mem = vzalloc(info.mmio_size);
+ if (!mem) {
+ ret = -ENOMEM;
+ goto err_mmio;
+ }
+
+ vgpu->initial_mmio = mem;
+
+ iter.i915 = dev_priv;
+ iter.data = vgpu->initial_mmio;
+ iter.do_mmio = do_mmio;
+ iter.do_mmio_block = do_mmio_block;
+
+ ret = intel_gvt_iterate_mmio_table(&iter);
+ if (ret)
+ goto err_iterate;
+
+ return 0;
+
+err_iterate:
+ vfree(vgpu->initial_mmio);
+ vgpu->initial_mmio = NULL;
+err_mmio:
+ kfree(vgpu->initial_cfg_space);
+ vgpu->initial_cfg_space = NULL;
+
+ return ret;
+}
+
/**
* intel_gvt_init - initialize GVT components
* @dev_priv: drm i915 private data
@@ -115,15 +212,23 @@ int intel_gvt_init(struct drm_i915_private *dev_priv)
return -EIO;
}
+ ret = save_inital_hw_state(dev_priv);
+ if (ret) {
+ drm_dbg(&dev_priv->drm, "Fail to save inital HW state\n");
+ goto err_save_hw_state;
+ }
+
ret = intel_gvt_init_device(dev_priv);
if (ret) {
drm_dbg(&dev_priv->drm, "Fail to init GVT device\n");
- goto bail;
+ goto err_init_device;
}
return 0;
-bail:
+err_init_device:
+ free_initial_hw_state(dev_priv);
+err_save_hw_state:
dev_priv->params.enable_gvt = 0;
return 0;
}
@@ -147,6 +252,7 @@ void intel_gvt_driver_remove(struct drm_i915_private *dev_priv)
return;
intel_gvt_clean_device(dev_priv);
+ free_initial_hw_state(dev_priv);
}
/**
--
2.25.1
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