[src/trunk]: src/sys/dev/pci Add Dynamic Power Allocation (DPA) ECN support.

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4ce2b4f055c4
branches:  trunk
changeset: 347189:4ce2b4f055c4
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Wed Aug 17 06:32:01 2016 +0000

description:
Add Dynamic Power Allocation (DPA) ECN support.

diffstat:

 sys/dev/pci/pci_subr.c |  71 +++++++++++++++++++++++++++++++++++++++++++++++--
 sys/dev/pci/pcireg.h   |  15 +++++++++-
 2 files changed, 81 insertions(+), 5 deletions(-)

diffs (128 lines):

diff -r be1f1ce4256d -r 4ce2b4f055c4 sys/dev/pci/pci_subr.c
--- a/sys/dev/pci/pci_subr.c    Wed Aug 17 03:10:22 2016 +0000
+++ b/sys/dev/pci/pci_subr.c    Wed Aug 17 06:32:01 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_subr.c,v 1.148 2016/06/20 10:02:43 msaitoh Exp $   */
+/*     $NetBSD: pci_subr.c,v 1.149 2016/08/17 06:32:01 msaitoh Exp $   */
 
 /*
  * Copyright (c) 1997 Zubin D. Dittia.  All rights reserved.
@@ -40,7 +40,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pci_subr.c,v 1.148 2016/06/20 10:02:43 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pci_subr.c,v 1.149 2016/08/17 06:32:01 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pci.h"
@@ -2993,7 +2993,70 @@
 
 /* XXX pci_conf_print_amd_cap */
 /* XXX pci_conf_print_resiz_bar_cap */
-/* XXX pci_conf_print_dpa_cap */
+
+static void
+pci_conf_print_dpa_cap(const pcireg_t *regs, int capoff, int extcapoff)
+{
+       pcireg_t reg;
+       unsigned int substmax, i;
+
+       printf("\n  Dynamic Power Allocation\n");
+
+       reg = regs[o2i(extcapoff + PCI_DPA_CAP)];
+       printf("    Capability register: 0x%08x\n", reg);
+       substmax = __SHIFTOUT(reg, PCI_DPA_CAP_SUBSTMAX);
+       printf("      Substate Max: %u\n", substmax);
+       printf("      Transition Latency Unit: ");
+       switch (__SHIFTOUT(reg, PCI_DPA_CAP_TLUINT)) {
+       case 0:
+               printf("1ms\n");
+               break;
+       case 1:
+               printf("10ms\n");
+               break;
+       case 2:
+               printf("100ms\n");
+               break;
+       default:
+               printf("reserved\n");
+               break;
+       }
+       printf("      Power Allocation Scale: ");
+       switch (__SHIFTOUT(reg, PCI_DPA_CAP_PAS)) {
+       case 0:
+               printf("10.0x\n");
+               break;
+       case 1:
+               printf("1.0x\n");
+               break;
+       case 2:
+               printf("0.1x\n");
+               break;
+       case 3:
+               printf("0.01x\n");
+               break;
+       }
+       printf("      Transition Latency Value 0: %u\n",
+           (unsigned int)__SHIFTOUT(reg, PCI_DPA_CAP_XLCY0));
+       printf("      Transition Latency Value 1: %u\n",
+           (unsigned int)__SHIFTOUT(reg, PCI_DPA_CAP_XLCY1));
+
+       reg = regs[o2i(extcapoff + PCI_DPA_LATIND)];
+       printf("    Latency Indicatior register: 0x%08x\n", reg);
+
+       reg = regs[o2i(extcapoff + PCI_DPA_CS)];
+       printf("    Status register: 0x%04x\n", reg & 0xffff);
+       printf("      Substate Status: %02x\n",
+           (unsigned int)__SHIFTOUT(reg, PCI_DPA_CS_SUBSTSTAT));
+       onoff("Substate Control Enabled", reg, PCI_DPA_CS_SUBSTCTLEN);
+       printf("    Control register: 0x%04x\n", reg >> 16);
+       printf("      Substate Control: %02x\n",
+           (unsigned int)__SHIFTOUT(reg, PCI_DPA_CS_SUBSTCTL));
+
+       for (i = 0; i <= substmax; i++)
+               printf("    Substate Power Allocation register %d: 0x%02x\n",
+                   i, (regs[PCI_DPA_PWRALLOC + (i / 4)] >> (i % 4) & 0xff));
+}
 
 static const char *
 pci_conf_print_tph_req_cap_sttabloc(unsigned char val)
@@ -3338,7 +3401,7 @@
        { PCI_EXTCAP_RESIZ_BAR, "Resizable BAR",
          NULL },
        { PCI_EXTCAP_DPA,       "Dynamic Power Allocation",
-         NULL },
+         pci_conf_print_dpa_cap },
        { PCI_EXTCAP_TPH_REQ,   "TPH Requester",
          pci_conf_print_tph_req_cap },
        { PCI_EXTCAP_LTR,       "Latency Tolerance Reporting",
diff -r be1f1ce4256d -r 4ce2b4f055c4 sys/dev/pci/pcireg.h
--- a/sys/dev/pci/pcireg.h      Wed Aug 17 03:10:22 2016 +0000
+++ b/sys/dev/pci/pcireg.h      Wed Aug 17 06:32:01 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pcireg.h,v 1.113 2016/05/11 05:12:57 msaitoh Exp $     */
+/*     $NetBSD: pcireg.h,v 1.114 2016/08/17 06:32:01 msaitoh Exp $     */
 
 /*
  * Copyright (c) 1995, 1996, 1999, 2000
@@ -1784,6 +1784,19 @@
  * Extended capability ID: 0x0016
  * Dynamic Power Allocation
  */
+#define        PCI_DPA_CAP     0x04    /* Capability */
+#define        PCI_DPA_CAP_SUBSTMAX    __BITS(4, 0)    /* Substate Max */
+#define        PCI_DPA_CAP_TLUINT      __BITS(9, 8)    /* Transition Latency Unit */
+#define        PCI_DPA_CAP_PAS         __BITS(13, 12)  /* Power Allocation Scale */
+#define        PCI_DPA_CAP_XLCY0       __BITS(23, 16)  /* Transition Latency Value0 */
+#define        PCI_DPA_CAP_XLCY1       __BITS(31, 24)  /* Transition Latency Value1 */
+#define        PCI_DPA_LATIND  0x08    /* Latency Indicator */
+#define        PCI_DPA_CS      0x0c    /* Control and Status */
+#define        PCI_DPA_CS_SUBSTSTAT    __BITS(4, 0)    /* Substate Status */
+#define        PCI_DPA_CS_SUBSTCTLEN   __BIT(8)        /* Substate Control Enabled */
+#define        PCI_DPA_CS_SUBSTCTL     __BITS(20, 16)  /* Substate Control */
+#define        PCI_DPA_PWRALLOC 0x10   /* Start address of Power Allocation Array */
+#define        PCI_DPA_SUBST_MAXNUM    32      /* Max number of Substates (0 to 31) */
 
 /*
  * Extended capability ID: 0x0017