From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB
---
kernel/drivers/gpu/drm/i915/i915_params.c | 118 +++++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 87 insertions(+), 31 deletions(-)
diff --git a/kernel/drivers/gpu/drm/i915/i915_params.c b/kernel/drivers/gpu/drm/i915/i915_params.c
index 295e981..7f139ea 100644
--- a/kernel/drivers/gpu/drm/i915/i915_params.c
+++ b/kernel/drivers/gpu/drm/i915/i915_params.c
@@ -35,10 +35,19 @@
MODULE_PARM_DESC(name, desc)
struct i915_params i915_modparams __read_mostly = {
-#define MEMBER(T, member, value) .member = (value),
+#define MEMBER(T, member, value, ...) .member = (value),
I915_PARAMS_FOR_EACH(MEMBER)
#undef MEMBER
};
+
+/*
+ * Note: As a rule, keep module parameter sysfs permissions read-only
+ * 0400. Runtime changes are only supported through i915 debugfs.
+ *
+ * For any exceptions requiring write access and runtime changes through module
+ * parameter sysfs, prevent debugfs file creation by setting the parameter's
+ * debugfs mode to 0.
+ */
i915_param_named(modeset, int, 0400,
"Use kernel modesetting [KMS] (0=disable, "
@@ -46,9 +55,10 @@
i915_param_named_unsafe(enable_dc, int, 0400,
"Enable power-saving display C-states. "
- "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6)");
+ "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
+ "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");
-i915_param_named_unsafe(enable_fbc, int, 0600,
+i915_param_named_unsafe(enable_fbc, int, 0400,
"Enable frame buffer compression for power savings "
"(default: -1 (use per-chip default))");
@@ -56,7 +66,7 @@
"Specify LVDS channel mode "
"(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
-i915_param_named_unsafe(panel_use_ssc, int, 0600,
+i915_param_named_unsafe(panel_use_ssc, int, 0400,
"Use Spread Spectrum Clock with panels [LVDS/eDP] "
"(default: auto from VBT)");
@@ -64,59 +74,63 @@
"Override/Ignore selection of SDVO panel mode in the VBT "
"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
-i915_param_named_unsafe(reset, int, 0600,
+i915_param_named_unsafe(reset, uint, 0400,
"Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
i915_param_named_unsafe(vbt_firmware, charp, 0400,
"Load VBT from specified file under /lib/firmware");
#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
-i915_param_named(error_capture, bool, 0600,
+i915_param_named(error_capture, bool, 0400,
"Record the GPU state following a hang. "
"This information in /sys/class/drm/card<N>/error is vital for "
"triaging and debugging hangs.");
#endif
-i915_param_named_unsafe(enable_hangcheck, bool, 0644,
+i915_param_named_unsafe(enable_hangcheck, bool, 0400,
"Periodically check GPU activity for detecting hangs. "
"WARNING: Disabling this can cause system wide hangs. "
"(default: true)");
-i915_param_named_unsafe(enable_ppgtt, int, 0400,
- "Override PPGTT usage. "
- "(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
-
-i915_param_named_unsafe(enable_psr, int, 0600,
+i915_param_named_unsafe(enable_psr, int, 0400,
"Enable PSR "
"(0=disabled, 1=enabled) "
"Default: -1 (use per-chip default)");
-i915_param_named_unsafe(alpha_support, bool, 0400,
- "Enable alpha quality driver support for latest hardware. "
- "See also CONFIG_DRM_I915_ALPHA_SUPPORT.");
+i915_param_named(psr_safest_params, bool, 0400,
+ "Replace PSR VBT parameters by the safest and not optimal ones. This "
+ "is helpful to detect if PSR issues are related to bad values set in "
+ " VBT. (0=use VBT parameters, 1=use safest parameters)");
+
+i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
+ "Enable PSR2 selective fetch "
+ "(0=disabled, 1=enabled) "
+ "Default: 0");
+
+i915_param_named_unsafe(force_probe, charp, 0400,
+ "Force probe the driver for specified devices. "
+ "See CONFIG_DRM_I915_FORCE_PROBE for details.");
i915_param_named_unsafe(disable_power_well, int, 0400,
"Disable display power wells when possible "
"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
-i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)");
+i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)");
-i915_param_named(fastboot, bool, 0600,
- "Try to skip unnecessary mode sets at boot time (default: false)");
+i915_param_named(fastboot, int, 0400,
+ "Try to skip unnecessary mode sets at boot time "
+ "(0=disabled, 1=enabled) "
+ "Default: -1 (use per-chip default)");
-i915_param_named_unsafe(prefault_disable, bool, 0600,
- "Disable page prefaulting for pread/pwrite/reloc (default:false). "
- "For developers only.");
-
-i915_param_named_unsafe(load_detect_test, bool, 0600,
+i915_param_named_unsafe(load_detect_test, bool, 0400,
"Force-enable the VGA load detect code for testing (default:false). "
"For developers only.");
-i915_param_named_unsafe(force_reset_modeset_test, bool, 0600,
+i915_param_named_unsafe(force_reset_modeset_test, bool, 0400,
"Force a modeset during gpu reset for testing (default:false). "
"For developers only.");
-i915_param_named_unsafe(invert_brightness, int, 0600,
+i915_param_named_unsafe(invert_brightness, int, 0400,
"Invert backlight brightness "
"(-1 force normal, 0 machine defaults, 1 force inversion), please "
"report PCI device ID, subsystem vendor and subsystem device ID "
@@ -126,10 +140,11 @@
i915_param_named(disable_display, bool, 0400,
"Disable display (default: false)");
-i915_param_named(mmio_debug, int, 0600,
+i915_param_named(mmio_debug, int, 0400,
"Enable the MMIO debug code for the first N failures (default: off). "
"This may negatively affect performance.");
+/* Special case writable file */
i915_param_named(verbose_state_checks, bool, 0600,
"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
@@ -160,19 +175,27 @@
i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
"DMC firmware path to use instead of the default one");
-i915_param_named_unsafe(enable_dp_mst, bool, 0600,
+i915_param_named_unsafe(enable_dp_mst, bool, 0400,
"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
-i915_param_named_unsafe(inject_load_failure, uint, 0400,
+i915_param_named_unsafe(inject_probe_failure, uint, 0400,
"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
#endif
-i915_param_named(enable_dpcd_backlight, bool, 0600,
- "Enable support for DPCD backlight control (default:false)");
+i915_param_named(enable_dpcd_backlight, int, 0400,
+ "Enable support for DPCD backlight control"
+ "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled)");
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
i915_param_named(enable_gvt, bool, 0400,
"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
+#endif
+
+#if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM)
+i915_param_named_unsafe(fake_lmem_start, ulong, 0400,
+ "Fake LMEM start offset (default: 0)");
+#endif
static __always_inline void _print_param(struct drm_printer *p,
const char *name,
@@ -185,10 +208,13 @@
drm_printf(p, "i915.%s=%d\n", name, *(const int *)x);
else if (!__builtin_strcmp(type, "unsigned int"))
drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x);
+ else if (!__builtin_strcmp(type, "unsigned long"))
+ drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x);
else if (!__builtin_strcmp(type, "char *"))
drm_printf(p, "i915.%s=%s\n", name, *(const char **)x);
else
- BUILD_BUG();
+ WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n",
+ type, name);
}
/**
@@ -204,3 +230,33 @@
I915_PARAMS_FOR_EACH(PRINT);
#undef PRINT
}
+
+static __always_inline void dup_param(const char *type, void *x)
+{
+ if (!__builtin_strcmp(type, "char *"))
+ *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
+}
+
+void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
+{
+ *dest = *src;
+#define DUP(T, x, ...) dup_param(#T, &dest->x);
+ I915_PARAMS_FOR_EACH(DUP);
+#undef DUP
+}
+
+static __always_inline void free_param(const char *type, void *x)
+{
+ if (!__builtin_strcmp(type, "char *")) {
+ kfree(*(void **)x);
+ *(void **)x = NULL;
+ }
+}
+
+/* free the allocated members, *not* the passed in params itself */
+void i915_params_free(struct i915_params *params)
+{
+#define FREE(T, x, ...) free_param(#T, ¶ms->x);
+ I915_PARAMS_FOR_EACH(FREE);
+#undef FREE
+}
--
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