mirror of
https://aur.archlinux.org/linux-vfio.git
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166 lines
6.2 KiB
Diff
166 lines
6.2 KiB
Diff
From 33d2dbe323583bb2f344c857a100f1116fad70d9 Mon Sep 17 00:00:00 2001
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From: xiota <>
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Date: Fri, 29-Dec-2023 12:34:56 +0000
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Subject: [PATCH 2/2] i915-vga-arbiter
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---
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.../drm/i915/display/intel_display_driver.c | 16 ++++++++--
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.../drm/i915/display/intel_display_driver.h | 1 +
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drivers/gpu/drm/i915/display/intel_vga.c | 31 +++++++++++++++++++
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drivers/gpu/drm/i915/display/intel_vga.h | 4 +++
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drivers/gpu/drm/i915/i915_params.c | 3 ++
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drivers/gpu/drm/i915/i915_params.h | 1 +
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6 files changed, 53 insertions(+), 3 deletions(-)
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diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
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index 8f144d4d3..915a5ec47 100644
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--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
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+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
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@@ -205,9 +205,11 @@ int intel_display_driver_probe_noirq(struct drm_i915_private *i915)
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intel_bios_init(i915);
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- ret = intel_vga_register(i915);
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- if (ret)
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- goto cleanup_bios;
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+ if (!i915_modparams.enable_hd_vgaarb || !HAS_PCH_SPLIT(i915)) {
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+ ret = intel_vga_register(i915);
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+ if (ret)
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+ goto cleanup_bios;
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+ }
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/* FIXME: completely on the wrong abstraction layer */
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ret = intel_power_domains_init(i915);
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@@ -366,6 +368,12 @@ int intel_display_driver_probe(struct drm_i915_private *i915)
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if (ret)
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return ret;
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+ /*
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+ * Must do this after fbcon init so that
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+ * vgacon_save_screen() works during the handover.
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+ */
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+ intel_vga_disable_mem(i915);
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+
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/* Only enable hotplug handling once the fbdev is fully set up. */
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intel_hpd_init(i915);
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intel_hpd_poll_disable(i915);
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@@ -412,6 +420,7 @@ void intel_display_driver_remove(struct drm_i915_private *i915)
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if (!HAS_DISPLAY(i915))
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return;
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+ intel_vga_enable_mem(i915);
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flush_workqueue(i915->display.wq.flip);
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flush_workqueue(i915->display.wq.modeset);
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@@ -444,6 +453,7 @@ void intel_display_driver_remove_noirq(struct drm_i915_private *i915)
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intel_unregister_dsm_handler();
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/* flush any delayed tasks or pending work */
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+ intel_vga_enable_mem(i915);
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flush_workqueue(i915->unordered_wq);
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intel_hdcp_component_fini(i915);
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diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.h b/drivers/gpu/drm/i915/display/intel_display_driver.h
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index c276a58ee..54b752a93 100644
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--- a/drivers/gpu/drm/i915/display/intel_display_driver.h
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+++ b/drivers/gpu/drm/i915/display/intel_display_driver.h
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@@ -13,6 +13,7 @@ struct drm_i915_private;
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struct drm_modeset_acquire_ctx;
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struct pci_dev;
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+extern void intel_vga_disable_mem(struct drm_i915_private *dev_priv);
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bool intel_display_driver_probe_defer(struct pci_dev *pdev);
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void intel_display_driver_init_hw(struct drm_i915_private *i915);
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void intel_display_driver_early_probe(struct drm_i915_private *i915);
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diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
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index 286a0bdd2..18d30ee84 100644
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--- a/drivers/gpu/drm/i915/display/intel_vga.c
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+++ b/drivers/gpu/drm/i915/display/intel_vga.c
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@@ -47,6 +47,36 @@ void intel_vga_disable(struct drm_i915_private *dev_priv)
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intel_de_posting_read(dev_priv, vga_reg);
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}
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+void intel_vga_enable_mem(struct drm_i915_private *dev_priv)
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+{
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+ struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
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+
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+ /* Enable VGA memory on Intel HD */
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+ if (i915_modparams.enable_hd_vgaarb && HAS_PCH_SPLIT(dev_priv)) {
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+ vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
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+ outb(inb(VGA_MIS_R) | (1 << 1), VGA_MIS_W);
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+ vga_set_legacy_decoding(pdev, VGA_RSRC_LEGACY_IO |
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+ VGA_RSRC_LEGACY_MEM |
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+ VGA_RSRC_NORMAL_IO |
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+ VGA_RSRC_NORMAL_MEM);
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+ vga_put(pdev, VGA_RSRC_LEGACY_IO);
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+ }
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+}
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+
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+void intel_vga_disable_mem(struct drm_i915_private *dev_priv)
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+{
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+ struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
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+ /* Disable VGA memory on Intel HD */
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+ if (i915_modparams.enable_hd_vgaarb && HAS_PCH_SPLIT(dev_priv)) {
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+ vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO);
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+ outb(inb(VGA_MIS_R) & ~(1 << 1), VGA_MIS_W);
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+ vga_set_legacy_decoding(pdev, VGA_RSRC_LEGACY_IO |
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+ VGA_RSRC_NORMAL_IO |
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+ VGA_RSRC_NORMAL_MEM);
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+ vga_put(pdev, VGA_RSRC_LEGACY_IO);
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+ }
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+}
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+
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void intel_vga_redisable_power_on(struct drm_i915_private *dev_priv)
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{
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i915_reg_t vga_reg = intel_vga_cntrl_reg(dev_priv);
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@@ -55,6 +85,7 @@ void intel_vga_redisable_power_on(struct drm_i915_private *dev_priv)
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drm_dbg_kms(&dev_priv->drm,
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"Something enabled VGA plane, disabling it\n");
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intel_vga_disable(dev_priv);
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+ intel_vga_disable_mem(dev_priv);
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}
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}
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diff --git a/drivers/gpu/drm/i915/display/intel_vga.h b/drivers/gpu/drm/i915/display/intel_vga.h
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index ba5b55b91..7e2af7924 100644
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--- a/drivers/gpu/drm/i915/display/intel_vga.h
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+++ b/drivers/gpu/drm/i915/display/intel_vga.h
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@@ -15,4 +15,8 @@ void intel_vga_redisable_power_on(struct drm_i915_private *i915);
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int intel_vga_register(struct drm_i915_private *i915);
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void intel_vga_unregister(struct drm_i915_private *i915);
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+/* i915 vga arb patch */
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+void intel_vga_enable_mem(struct drm_i915_private *i915);
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+void intel_vga_disable_mem(struct drm_i915_private *i915);
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+
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#endif /* __INTEL_VGA_H__ */
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diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
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index 0a171b57f..739d31067 100644
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--- a/drivers/gpu/drm/i915/i915_params.c
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+++ b/drivers/gpu/drm/i915/i915_params.c
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@@ -160,6 +160,9 @@ i915_param_named_unsafe(invert_brightness, int, 0400,
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i915_param_named(disable_display, bool, 0400,
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"Disable display (default: false)");
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+i915_param_named(enable_hd_vgaarb, bool, 0444,
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+ "Enable support for VGA arbitration on Intel HD IGD. (default: false)");
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+
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i915_param_named(memtest, bool, 0400,
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"Perform a read/write test of all device memory on module load (default: off)");
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diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
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index 68abf0ad6..507d29c52 100644
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--- a/drivers/gpu/drm/i915/i915_params.h
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+++ b/drivers/gpu/drm/i915/i915_params.h
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@@ -79,6 +79,7 @@ struct drm_printer;
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param(unsigned int, lmem_size, 0, 0400) \
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param(unsigned int, lmem_bar_size, 0, 0400) \
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/* leave bools at the end to not create holes */ \
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+ param(bool, enable_hd_vgaarb, false, 0600) \
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param(bool, enable_hangcheck, true, 0600) \
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param(bool, load_detect_test, false, 0600) \
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param(bool, force_reset_modeset_test, false, 0600) \
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--
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2.43.0
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