1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2014-2019 Intel Corporation
4  *
5  * Authors:
6  *    Vinit Azad <vinit.azad@intel.com>
7  *    Ben Widawsky <ben@bwidawsk.net>
8  *    Dave Gordon <david.s.gordon@intel.com>
9  *    Alex Dai <yu.dai@intel.com>
10  */
11 
12 #include "gt/intel_gt.h"
13 #include "intel_guc_fw.h"
14 #include "i915_drv.h"
15 
16 static void guc_prepare_xfer(struct intel_uncore *uncore)
17 {
18 	u32 shim_flags = GUC_DISABLE_SRAM_INIT_TO_ZEROES |
19 			 GUC_ENABLE_READ_CACHE_LOGIC |
20 			 GUC_ENABLE_MIA_CACHING |
21 			 GUC_ENABLE_READ_CACHE_FOR_SRAM_DATA |
22 			 GUC_ENABLE_READ_CACHE_FOR_WOPCM_DATA |
23 			 GUC_ENABLE_MIA_CLOCK_GATING;
24 
25 	/* Must program this register before loading the ucode with DMA */
26 	intel_uncore_write(uncore, GUC_SHIM_CONTROL, shim_flags);
27 
28 	if (IS_GEN9_LP(uncore->i915))
29 		intel_uncore_write(uncore, GEN9LP_GT_PM_CONFIG, GT_DOORBELL_ENABLE);
30 	else
31 		intel_uncore_write(uncore, GEN9_GT_PM_CONFIG, GT_DOORBELL_ENABLE);
32 
33 	if (IS_GEN(uncore->i915, 9)) {
34 		/* DOP Clock Gating Enable for GuC clocks */
35 		intel_uncore_rmw(uncore, GEN7_MISCCPCTL,
36 				 0, GEN8_DOP_CLOCK_GATE_GUC_ENABLE);
37 
38 		/* allows for 5us (in 10ns units) before GT can go to RC6 */
39 		intel_uncore_write(uncore, GUC_ARAT_C6DIS, 0x1FF);
40 	}
41 }
42 
43 /* Copy RSA signature from the fw image to HW for verification */
44 static void guc_xfer_rsa(struct intel_uc_fw *guc_fw,
45 			 struct intel_uncore *uncore)
46 {
47 	u32 rsa[UOS_RSA_SCRATCH_COUNT];
48 	size_t copied;
49 	int i;
50 
51 	copied = intel_uc_fw_copy_rsa(guc_fw, rsa, sizeof(rsa));
52 	GEM_BUG_ON(copied < sizeof(rsa));
53 
54 	for (i = 0; i < UOS_RSA_SCRATCH_COUNT; i++)
55 		intel_uncore_write(uncore, UOS_RSA_SCRATCH(i), rsa[i]);
56 }
57 
58 /*
59  * Read the GuC status register (GUC_STATUS) and store it in the
60  * specified location; then return a boolean indicating whether
61  * the value matches either of two values representing completion
62  * of the GuC boot process.
63  *
64  * This is used for polling the GuC status in a wait_for()
65  * loop below.
66  */
67 static inline bool guc_ready(struct intel_uncore *uncore, u32 *status)
68 {
69 	u32 val = intel_uncore_read(uncore, GUC_STATUS);
70 	u32 uk_val = val & GS_UKERNEL_MASK;
71 
72 	*status = val;
73 	return (uk_val == GS_UKERNEL_READY) ||
74 		((val & GS_MIA_CORE_STATE) && (uk_val == GS_UKERNEL_LAPIC_DONE));
75 }
76 
77 static int guc_wait_ucode(struct intel_uncore *uncore)
78 {
79 	u32 status;
80 	int ret;
81 
82 	/*
83 	 * Wait for the GuC to start up.
84 	 * NB: Docs recommend not using the interrupt for completion.
85 	 * Measurements indicate this should take no more than 20ms, so a
86 	 * timeout here indicates that the GuC has failed and is unusable.
87 	 * (Higher levels of the driver may decide to reset the GuC and
88 	 * attempt the ucode load again if this happens.)
89 	 */
90 	ret = wait_for(guc_ready(uncore, &status), 100);
91 	DRM_DEBUG_DRIVER("GuC status %#x\n", status);
92 
93 	if ((status & GS_BOOTROM_MASK) == GS_BOOTROM_RSA_FAILED) {
94 		DRM_ERROR("GuC firmware signature verification failed\n");
95 		ret = -ENOEXEC;
96 	}
97 
98 	if ((status & GS_UKERNEL_MASK) == GS_UKERNEL_EXCEPTION) {
99 		DRM_ERROR("GuC firmware exception. EIP: %#x\n",
100 			  intel_uncore_read(uncore, SOFT_SCRATCH(13)));
101 		ret = -ENXIO;
102 	}
103 
104 	return ret;
105 }
106 
107 /**
108  * intel_guc_fw_upload() - load GuC uCode to device
109  * @guc: intel_guc structure
110  *
111  * Called from intel_uc_init_hw() during driver load, resume from sleep and
112  * after a GPU reset.
113  *
114  * The firmware image should have already been fetched into memory, so only
115  * check that fetch succeeded, and then transfer the image to the h/w.
116  *
117  * Return:	non-zero code on error
118  */
119 int intel_guc_fw_upload(struct intel_guc *guc)
120 {
121 	struct intel_gt *gt = guc_to_gt(guc);
122 	struct intel_uncore *uncore = gt->uncore;
123 	int ret;
124 
125 	guc_prepare_xfer(uncore);
126 
127 	/*
128 	 * Note that GuC needs the CSS header plus uKernel code to be copied
129 	 * by the DMA engine in one operation, whereas the RSA signature is
130 	 * loaded via MMIO.
131 	 */
132 	guc_xfer_rsa(&guc->fw, uncore);
133 
134 	/*
135 	 * Current uCode expects the code to be loaded at 8k; locations below
136 	 * this are used for the stack.
137 	 */
138 	ret = intel_uc_fw_upload(&guc->fw, 0x2000, UOS_MOVE);
139 	if (ret)
140 		goto out;
141 
142 	ret = guc_wait_ucode(uncore);
143 	if (ret)
144 		goto out;
145 
146 	intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_RUNNING);
147 	return 0;
148 
149 out:
150 	intel_uc_fw_change_status(&guc->fw, INTEL_UC_FIRMWARE_FAIL);
151 	return ret;
152 }
153