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[88.115.161.74]) by smtp.gmail.com with ESMTPSA id j20sm1878093lfg.232.2022.02.08.03.12.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Feb 2022 03:12:00 -0800 (PST) From: Zhi Wang X-Google-Original-From: Zhi Wang To: hch@lst.de, jgg@nvidia.com, jani.nikula@linux.intel.com Cc: intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Zhi Wang , Joonas Lahtinen , Vivi Rodrigo , Zhenyu Wang Subject: [PATCH v6 2/3] i915/gvt: Save the initial HW state snapshot in i915 Date: Tue, 8 Feb 2022 06:11:50 -0500 Message-Id: <20220208111151.13115-2-zhi.a.wang@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220208111151.13115-1-zhi.a.wang@intel.com> References: <20220208111151.13115-1-zhi.a.wang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Save the initial 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. v6: - Remove the reference of intel_gvt_device_info.(Christoph) - Refine the save_mmio() function. (Christoph) Cc: Christoph Hellwig Cc: Jason Gunthorpe Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Vivi Rodrigo Cc: Zhenyu Wang Cc: Zhi Wang Signed-off-by: Zhi Wang --- drivers/gpu/drm/i915/i915_drv.h | 2 + drivers/gpu/drm/i915/intel_gvt.c | 92 +++++++++++++++++++++++++++++++- 2 files changed, 92 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 32aa6f111d6b..c5019173ac44 100644 --- a/drivers/gpu/drm/i915/intel_gvt.c +++ b/drivers/gpu/drm/i915/intel_gvt.c @@ -68,6 +68,85 @@ 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; + u32 *mmio, i; + + for (i = offset; i < offset + size; i += 4) { + mmio = iter->data + i; + *mmio = intel_uncore_read_notrace(to_gt(dev_priv)->uncore, + _MMIO(i)); + } +} + +static int handle_mmio(struct intel_gvt_mmio_table_iter *iter, + u32 offset, u32 device, u32 size) +{ + if (WARN_ON(!IS_ALIGNED(offset, 4))) + return -EINVAL; + + save_mmio(iter, offset, size); + return 0; +} + +static int save_initial_hw_state(struct drm_i915_private *dev_priv) +{ + struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev); + struct i915_virtual_gpu *vgpu = &dev_priv->vgpu; + struct intel_gvt_mmio_table_iter iter; + void *mem; + int i, ret; + + mem = kzalloc(PCI_CFG_SPACE_EXP_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(2 * SZ_1M); + if (!mem) { + ret = -ENOMEM; + goto err_mmio; + } + + vgpu->initial_mmio = mem; + + iter.i915 = dev_priv; + iter.data = vgpu->initial_mmio; + iter.handle_mmio_cb = handle_mmio; + + 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 @@ -97,15 +176,23 @@ int intel_gvt_init(struct drm_i915_private *dev_priv) return -EIO; } + ret = save_initial_hw_state(dev_priv); + if (ret) { + drm_dbg(&dev_priv->drm, "Fail to save initial 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; } @@ -129,6 +216,7 @@ 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