drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/gt/intel_gt_pm_irq.c
Extension
.c
Size
2431 bytes
Lines
110
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2019 Intel Corporation
 */

#include "i915_drv.h"
#include "i915_reg.h"
#include "intel_gt.h"
#include "intel_gt_irq.h"
#include "intel_gt_pm_irq.h"
#include "intel_gt_regs.h"

static void write_pm_imr(struct intel_gt *gt)
{
	struct drm_i915_private *i915 = gt->i915;
	struct intel_uncore *uncore = gt->uncore;
	u32 mask = gt->pm_imr;
	i915_reg_t reg;

	if (GRAPHICS_VER(i915) >= 11) {
		reg = GEN11_GPM_WGBOXPERF_INTR_MASK;
		mask <<= 16; /* pm is in upper half */
	} else if (GRAPHICS_VER(i915) >= 8) {
		reg = GEN8_GT_IMR(2);
	} else {
		reg = GEN6_PMIMR;
	}

	intel_uncore_write(uncore, reg, mask);
}

static void gen6_gt_pm_update_irq(struct intel_gt *gt,
				  u32 interrupt_mask,
				  u32 enabled_irq_mask)
{
	u32 new_val;

	WARN_ON(enabled_irq_mask & ~interrupt_mask);

	lockdep_assert_held(gt->irq_lock);

	new_val = gt->pm_imr;
	new_val &= ~interrupt_mask;
	new_val |= ~enabled_irq_mask & interrupt_mask;

	if (new_val != gt->pm_imr) {
		gt->pm_imr = new_val;
		write_pm_imr(gt);
	}
}

void gen6_gt_pm_unmask_irq(struct intel_gt *gt, u32 mask)
{
	gen6_gt_pm_update_irq(gt, mask, mask);
}

void gen6_gt_pm_mask_irq(struct intel_gt *gt, u32 mask)
{
	gen6_gt_pm_update_irq(gt, mask, 0);
}

void gen6_gt_pm_reset_iir(struct intel_gt *gt, u32 reset_mask)
{
	struct intel_uncore *uncore = gt->uncore;
	i915_reg_t reg = GRAPHICS_VER(gt->i915) >= 8 ? GEN8_GT_IIR(2) : GEN6_PMIIR;

	lockdep_assert_held(gt->irq_lock);

	intel_uncore_write(uncore, reg, reset_mask);
	intel_uncore_write(uncore, reg, reset_mask);
	intel_uncore_posting_read(uncore, reg);
}

static void write_pm_ier(struct intel_gt *gt)
{
	struct drm_i915_private *i915 = gt->i915;
	struct intel_uncore *uncore = gt->uncore;
	u32 mask = gt->pm_ier;
	i915_reg_t reg;

	if (GRAPHICS_VER(i915) >= 11) {
		reg = GEN11_GPM_WGBOXPERF_INTR_ENABLE;
		mask <<= 16; /* pm is in upper half */
	} else if (GRAPHICS_VER(i915) >= 8) {
		reg = GEN8_GT_IER(2);
	} else {
		reg = GEN6_PMIER;
	}

	intel_uncore_write(uncore, reg, mask);

Annotation

Implementation Notes