i915_irq.c

 1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2023 Intel Corporation
 4 */
 5
 6#include "i915_irq.h"
 7#include "i915_reg.h"
 8#include "intel_uncore.h"
 9
10void gen2_irq_reset(struct intel_uncore *uncore, struct i915_irq_regs regs)
11{
12	intel_uncore_write(uncore, regs.imr, 0xffffffff);
13	intel_uncore_posting_read(uncore, regs.imr);
14
15	intel_uncore_write(uncore, regs.ier, 0);
16
17	/* IIR can theoretically queue up two events. Be paranoid. */
18	intel_uncore_write(uncore, regs.iir, 0xffffffff);
19	intel_uncore_posting_read(uncore, regs.iir);
20	intel_uncore_write(uncore, regs.iir, 0xffffffff);
21	intel_uncore_posting_read(uncore, regs.iir);
22}
23
24/*
25 * We should clear IMR at preinstall/uninstall, and just check at postinstall.
26 */
27void gen2_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg)
28{
29	struct xe_device *xe = container_of(uncore, struct xe_device, uncore);
30	u32 val = intel_uncore_read(uncore, reg);
31
32	if (val == 0)
33		return;
34
35	drm_WARN(&xe->drm, 1,
36		 "Interrupt register 0x%x is not zero: 0x%08x\n",
37		 i915_mmio_reg_offset(reg), val);
38	intel_uncore_write(uncore, reg, 0xffffffff);
39	intel_uncore_posting_read(uncore, reg);
40	intel_uncore_write(uncore, reg, 0xffffffff);
41	intel_uncore_posting_read(uncore, reg);
42}
43
44void gen2_irq_init(struct intel_uncore *uncore, struct i915_irq_regs regs,
45		   u32 imr_val, u32 ier_val)
46{
47	gen2_assert_iir_is_zero(uncore, regs.iir);
48
49	intel_uncore_write(uncore, regs.ier, ier_val);
50	intel_uncore_write(uncore, regs.imr, imr_val);
51	intel_uncore_posting_read(uncore, regs.imr);
52}
53
54void gen2_error_reset(struct intel_uncore *uncore, struct i915_error_regs regs)
55{
56	intel_uncore_write(uncore, regs.emr, 0xffffffff);
57	intel_uncore_posting_read(uncore, regs.emr);
58
59	intel_uncore_write(uncore, regs.eir, 0xffffffff);
60	intel_uncore_posting_read(uncore, regs.eir);
61	intel_uncore_write(uncore, regs.eir, 0xffffffff);
62	intel_uncore_posting_read(uncore, regs.eir);
63}
64
65void gen2_error_init(struct intel_uncore *uncore, struct i915_error_regs regs,
66		     u32 emr_val)
67{
68	intel_uncore_write(uncore, regs.eir, 0xffffffff);
69	intel_uncore_posting_read(uncore, regs.eir);
70	intel_uncore_write(uncore, regs.eir, 0xffffffff);
71	intel_uncore_posting_read(uncore, regs.eir);
72
73	intel_uncore_write(uncore, regs.emr, emr_val);
74	intel_uncore_posting_read(uncore, regs.emr);
75}
76
77bool intel_irqs_enabled(struct xe_device *xe)
78{
79	return atomic_read(&xe->irq.enabled);
80}
81
82void intel_synchronize_irq(struct xe_device *xe)
83{
84	synchronize_irq(to_pci_dev(xe->drm.dev)->irq);
85}