nb/amd/pi/00730F01: use MMIO and performance counters from AGESA

This patch contain minimal set of changes to initial IVRS implementation
to make it work reliably. Code in this patch was tested with Xen 4.8 and
Debian 4.14.y - this software stack survived 100x reboots without any
hang on PC Engines apu2c4. Previously using IVRS provided by AGESA lead
to 29/100 hangs.

MMIO base shall not be hard coded since this value depends on platform
design.

Performance counters were selected experimentally, since lack of
them cause 4.14.y panic:
[    1.064229] AMD-Vi: IOMMU performance counters supported
[    1.069579] BUG: unable to handle kernel paging request at ffffaffc4065c000
[    1.073554] IP: iommu_go_to_state+0xf8a/0x1260
[    1.073554] PGD 12a11f067 P4D 12a11f067 PUD 12a120067 PMD 129b69067 PTE 0
[    1.073554] Oops: 0000 [#1] SMP NOPTI
[    1.073554] Modules linked in:
[    1.073554] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.50 #13
[    1.073554] Hardware name: PC Engines apu2/apu2, BIOS 4.8-1174-gf12b3046f0-d2
[    1.073554] task: ffff8d5d69b9f040 task.stack: ffffaffc40648000
[    1.073554] RIP: 0010:iommu_go_to_state+0xf8a/0x1260
[    1.073554] RSP: 0018:ffffaffc4064be28 EFLAGS: 00010282
[    1.073554] RAX: ffffaffc40658000 RBX: ffff8d5d69bae000 RCX: ffffffff99e57b88
[    1.073554] RDX: 0000000000000000 RSI: 0000000000000092 RDI: 0000000000000246
[    1.073554] RBP: 0000000000000040 R08: 0000000000000001 R09: 0000000000000170
[    1.073554] R10: 0000000000000000 R11: ffffffff9a435e2d R12: 0000000000000000
[    1.073554] R13: ffffffff9a29a830 R14: 0000000000000000 R15: 0000000000000000
[    1.073554] FS:  0000000000000000(0000) GS:ffff8d5d6ec80000(0000) knlGS:00000
[    1.073554] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.073554] CR2: ffffaffc4065c000 CR3: 000000010fa0a000 CR4: 00000000000406e0
[    1.073554] Call Trace:
[    1.073554]  ? set_debug_rodata+0x11/0x11
[    1.073554]  amd_iommu_init+0x11/0x89
[    1.073554]  pci_iommu_init+0x16/0x3f
[    1.073554]  ? e820__memblock_setup+0x60/0x60
[    1.073554]  do_one_initcall+0x51/0x190
[    1.073554]  ? set_debug_rodata+0x11/0x11
[    1.073554]  kernel_init_freeable+0x16b/0x1ec
[    1.073554]  ? rest_init+0xb0/0xb0
[    1.073554]  kernel_init+0xa/0xf7
[    1.073554]  ret_from_fork+0x22/0x40
[    1.073554] Code: d2 31 f6 48 89 df e8 d8 15 02 ff 85 c0 75 d1 48 8b 44 24 2
[    1.073554] RIP: iommu_go_to_state+0xf8a/0x1260 RSP: ffffaffc4064be28
[    1.073554] CR2: ffffaffc4065c000
[    1.073554] ---[ end trace 44588f98aa7c7c0b ]---
[    1.255973] Kernel panic - not syncing: Attempted to kill init! exitcode=0x09
[    1.255973]
[    1.259934] ---[ end Kernel panic - not syncing: Attempted to kill init! exi9

Possible future improvements:
- compare device entries with values returned by AGESA
- enable EFRSup (this is enabled in AGESA)
- try various IVHD flags (there is difference between initial
implementation and AGESA)

Change-Id: I7e3a3d21f295ae96962d7718b9568fc4b67eb23d
Signed-off-by: Piotr Król <piotr.krol@3mdeb.com>
Reviewed-on: https://review.coreboot.org/27602
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

src/northbridge/amd/pi/00730F01/northbridge.c

@@ -582,6 +582,7 @@ unsigned long acpi_fill_ivrs_ioapic(acpi_ivrs_t *ivrs, unsigned long current)
 static unsigned long acpi_fill_ivrs(acpi_ivrs_t *ivrs, unsigned long current)
 {
 	uint8_t *p;
+	acpi_ivrs_t *ivrs_agesa;
 
 	struct device *nb_dev = dev_find_slot(0, PCI_DEVFN(0, 0));
 	if (!nb_dev) {
@@ -592,29 +593,43 @@ static unsigned long acpi_fill_ivrs(acpi_ivrs_t *ivrs, unsigned long current)
 		return (unsigned long)ivrs;
 	}
 
-	ivrs->iv_info = 0x0;
-	/* Maximum supported virtual address size */
-	ivrs->iv_info |= (0x40 << 15);
-	/* Maximum supported physical address size */
-	ivrs->iv_info |= (0x30 << 8);
-	/* Guest virtual address width */
-	ivrs->iv_info |= (0x2 << 5);
 
-	ivrs->ivhd.type = 0x10;
+	/* obtain IOMMU base address */
-	ivrs->ivhd.flags = 0x0e;
+	ivrs_agesa = agesawrapper_getlateinitptr(PICK_IVRS);
-	/* Enable ATS support */
+	if (ivrs_agesa != NULL) {
-	ivrs->ivhd.flags |= 0x10;
+		ivrs->iv_info = 0x0;
-	ivrs->ivhd.length = sizeof(struct acpi_ivrs_ivhd);
+		/* Maximum supported virtual address size */
-	/* BDF <bus>:00.2 */
+		ivrs->iv_info |= (0x40 << 15);
-	ivrs->ivhd.device_id = 0x2 | (nb_dev->bus->secondary << 8);
+		/* Maximum supported physical address size */
-	/* Capability block 0x40 (type 0xf, "Secure device") */
+		ivrs->iv_info |= (0x30 << 8);
-	ivrs->ivhd.capability_offset = 0x40;
+		/* Guest virtual address width */
-	ivrs->ivhd.iommu_base_low = 0xfeb00000;
+		ivrs->iv_info |= (0x2 << 5);
-	ivrs->ivhd.iommu_base_high = 0x0;
+
-	ivrs->ivhd.pci_segment_group = 0x0;
+		ivrs->ivhd.type = 0x10;
-	ivrs->ivhd.iommu_info = 0x0;
+		ivrs->ivhd.flags = 0x0e;
-	ivrs->ivhd.iommu_info |= (0x13 << 8);
+		/* Enable ATS support */
-	ivrs->ivhd.iommu_feature_info = 0x0;
+		ivrs->ivhd.flags |= 0x10;
+		ivrs->ivhd.length = sizeof(struct acpi_ivrs_ivhd);
+		/* BDF <bus>:00.2 */
+		ivrs->ivhd.device_id = 0x2 | (nb_dev->bus->secondary << 8);
+		/* Capability block 0x40 (type 0xf, "Secure device") */
+		ivrs->ivhd.capability_offset = 0x40;
+		ivrs->ivhd.iommu_base_low = ivrs_agesa->ivhd.iommu_base_low;
+		ivrs->ivhd.iommu_base_high = ivrs_agesa->ivhd.iommu_base_high;
+		ivrs->ivhd.pci_segment_group = 0x0;
+		ivrs->ivhd.iommu_info = 0x0;
+		ivrs->ivhd.iommu_info |= (0x13 << 8);
+		/* use only performance counters related bits:
+		 * PNCounters[16:13] and
+		 * PNBanks[22:17],
+		 * otherwise 0 */
+		ivrs->ivhd.iommu_feature_info =
+			ivrs_agesa->ivhd.iommu_feature_info & 0x7fe000;
+	} else {
+		printk(BIOS_WARNING, "%s: AGESA returned NULL IVRS\n", __func__);
+
+		return (unsigned long)ivrs;
+	}
 
 	/* Describe HPET */
 	p = (uint8_t *)current;