Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu / drivers / iommu / intel / cap_audit.c
Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
// SPDX-License-Identifier: GPL-2.0
/*
 * cap_audit.c - audit iommu capabilities for boot time and hot plug
 *
 * Copyright (C) 2021 Intel Corporation
 *
 * Author: Kyung Min Park <kyung.min.park@intel.com>
 *         Lu Baolu <baolu.lu@linux.intel.com>
 */

#define pr_fmt(fmt)	"DMAR: " fmt

#include "iommu.h"
#include "cap_audit.h"

static u64 intel_iommu_cap_sanity;
static u64 intel_iommu_ecap_sanity;

static inline void check_irq_capabilities(struct intel_iommu *a,
					  struct intel_iommu *b)
{
	CHECK_FEATURE_MISMATCH(a, b, cap, pi_support, CAP_PI_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, eim_support, ECAP_EIM_MASK);
}

static inline void check_dmar_capabilities(struct intel_iommu *a,
					   struct intel_iommu *b)
{
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_MAMV_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_NFR_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_SLLPS_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_FRO_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_MGAW_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_SAGAW_MASK);
	MINIMAL_FEATURE_IOMMU(b, cap, CAP_NDOMS_MASK);
	MINIMAL_FEATURE_IOMMU(b, ecap, ECAP_PSS_MASK);
	MINIMAL_FEATURE_IOMMU(b, ecap, ECAP_MHMV_MASK);
	MINIMAL_FEATURE_IOMMU(b, ecap, ECAP_IRO_MASK);

	CHECK_FEATURE_MISMATCH(a, b, cap, fl5lp_support, CAP_FL5LP_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, fl1gp_support, CAP_FL1GP_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, read_drain, CAP_RD_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, write_drain, CAP_WD_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, pgsel_inv, CAP_PSI_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, zlr, CAP_ZLR_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, caching_mode, CAP_CM_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, phmr, CAP_PHMR_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, plmr, CAP_PLMR_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, rwbf, CAP_RWBF_MASK);
	CHECK_FEATURE_MISMATCH(a, b, cap, afl, CAP_AFL_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, rps, ECAP_RPS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, smpwc, ECAP_SMPWC_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, flts, ECAP_FLTS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, slts, ECAP_SLTS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, nwfs, ECAP_NWFS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, slads, ECAP_SLADS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, vcs, ECAP_VCS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, smts, ECAP_SMTS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, pds, ECAP_PDS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, dit, ECAP_DIT_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, pasid, ECAP_PASID_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, eafs, ECAP_EAFS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, srs, ECAP_SRS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, ers, ECAP_ERS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, prs, ECAP_PRS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, nest, ECAP_NEST_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, mts, ECAP_MTS_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, sc_support, ECAP_SC_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, pass_through, ECAP_PT_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, dev_iotlb_support, ECAP_DT_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, qis, ECAP_QI_MASK);
	CHECK_FEATURE_MISMATCH(a, b, ecap, coherent, ECAP_C_MASK);
}

static int cap_audit_hotplug(struct intel_iommu *iommu, enum cap_audit_type type)
{
	bool mismatch = false;
	u64 old_cap = intel_iommu_cap_sanity;
	u64 old_ecap = intel_iommu_ecap_sanity;

	if (type == CAP_AUDIT_HOTPLUG_IRQR) {
		CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, pi_support, CAP_PI_MASK);
		CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, eim_support, ECAP_EIM_MASK);
		goto out;
	}

	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, fl5lp_support, CAP_FL5LP_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, fl1gp_support, CAP_FL1GP_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, read_drain, CAP_RD_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, write_drain, CAP_WD_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, pgsel_inv, CAP_PSI_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, zlr, CAP_ZLR_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, caching_mode, CAP_CM_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, phmr, CAP_PHMR_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, plmr, CAP_PLMR_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, rwbf, CAP_RWBF_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, cap, afl, CAP_AFL_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, rps, ECAP_RPS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, smpwc, ECAP_SMPWC_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, flts, ECAP_FLTS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, slts, ECAP_SLTS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, nwfs, ECAP_NWFS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, slads, ECAP_SLADS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, vcs, ECAP_VCS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, smts, ECAP_SMTS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, pds, ECAP_PDS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, dit, ECAP_DIT_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, pasid, ECAP_PASID_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, eafs, ECAP_EAFS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, srs, ECAP_SRS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, ers, ECAP_ERS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, prs, ECAP_PRS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, nest, ECAP_NEST_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, mts, ECAP_MTS_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, sc_support, ECAP_SC_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, pass_through, ECAP_PT_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, dev_iotlb_support, ECAP_DT_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, qis, ECAP_QI_MASK);
	CHECK_FEATURE_MISMATCH_HOTPLUG(iommu, ecap, coherent, ECAP_C_MASK);

	/* Abort hot plug if the hot plug iommu feature is smaller than global */
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, max_amask_val, CAP_MAMV_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, num_fault_regs, CAP_NFR_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, super_page_val, CAP_SLLPS_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, fault_reg_offset, CAP_FRO_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, mgaw, CAP_MGAW_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, sagaw, CAP_SAGAW_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, cap, ndoms, CAP_NDOMS_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, ecap, pss, ECAP_PSS_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, ecap, max_handle_mask, ECAP_MHMV_MASK, mismatch);
	MINIMAL_FEATURE_HOTPLUG(iommu, ecap, iotlb_offset, ECAP_IRO_MASK, mismatch);

out:
	if (mismatch) {
		intel_iommu_cap_sanity = old_cap;
		intel_iommu_ecap_sanity = old_ecap;
		return -EFAULT;
	}

	return 0;
}

static int cap_audit_static(struct intel_iommu *iommu, enum cap_audit_type type)
{
	struct dmar_drhd_unit *d;
	struct intel_iommu *i;
	int rc = 0;

	rcu_read_lock();
	if (list_empty(&dmar_drhd_units))
		goto out;

	for_each_active_iommu(i, d) {
		if (!iommu) {
			intel_iommu_ecap_sanity = i->ecap;
			intel_iommu_cap_sanity = i->cap;
			iommu = i;
			continue;
		}

		if (type == CAP_AUDIT_STATIC_DMAR)
			check_dmar_capabilities(iommu, i);
		else
			check_irq_capabilities(iommu, i);
	}

	/*
	 * If the system is sane to support scalable mode, either SL or FL
	 * should be sane.
	 */
	if (intel_cap_smts_sanity() &&
	    !intel_cap_flts_sanity() && !intel_cap_slts_sanity())
		rc = -EOPNOTSUPP;

out:
	rcu_read_unlock();
	return rc;
}

int intel_cap_audit(enum cap_audit_type type, struct intel_iommu *iommu)
{
	switch (type) {
	case CAP_AUDIT_STATIC_DMAR:
	case CAP_AUDIT_STATIC_IRQR:
		return cap_audit_static(iommu, type);
	case CAP_AUDIT_HOTPLUG_DMAR:
	case CAP_AUDIT_HOTPLUG_IRQR:
		return cap_audit_hotplug(iommu, type);
	default:
		break;
	}

	return -EFAULT;
}

bool intel_cap_smts_sanity(void)
{
	return ecap_smts(intel_iommu_ecap_sanity);
}

bool intel_cap_pasid_sanity(void)
{
	return ecap_pasid(intel_iommu_ecap_sanity);
}

bool intel_cap_nest_sanity(void)
{
	return ecap_nest(intel_iommu_ecap_sanity);
}

bool intel_cap_flts_sanity(void)
{
	return ecap_flts(intel_iommu_ecap_sanity);
}

bool intel_cap_slts_sanity(void)
{
	return ecap_slts(intel_iommu_ecap_sanity);
}