diff mbox series

[v4,2/2] pciutils: Decode Compute eXpress Link DVSEC

Message ID 20200413153526.805776-3-sean.v.kelley@linux.intel.com
State New
Headers show
Series pciutils: Add basic decode support for CXL DVSEC | expand

Commit Message

Sean V Kelley April 13, 2020, 3:35 p.m. UTC
Compute eXpress Link[1] is a new CPU interconnect created with
workload accelerators in mind. The interconnect relies on PCIe
electrical and physical interconnect for communication via a Flex Bus
port which allows designs to choose between providing PCIe or CXL.

This patch introduces basic support for lspci decode of CXL and
builds upon the existing Designated Vendor-Specific support in
lspci through identification of a Flex Bus capable Vendor ID.

[1] https://www.computeexpresslink.org/

Signed-off-by: Sean V Kelley <sean.v.kelley@linux.intel.com>
---
 lib/header.h        |  20 +++
 ls-ecaps.c          |  50 ++++++-
 tests/cap-dvsec-cxl | 340 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 409 insertions(+), 1 deletion(-)
 create mode 100644 tests/cap-dvsec-cxl

Comments

Bjorn Helgaas April 14, 2020, 8:37 p.m. UTC | #1
On Mon, Apr 13, 2020 at 08:35:26AM -0700, Sean V Kelley wrote:
> Compute eXpress Link[1] is a new CPU interconnect created with
> workload accelerators in mind. The interconnect relies on PCIe
> electrical and physical interconnect for communication via a Flex Bus
> port which allows designs to choose between providing PCIe or CXL.
> 
> This patch introduces basic support for lspci decode of CXL and
> builds upon the existing Designated Vendor-Specific support in
> lspci through identification of a Flex Bus capable Vendor ID.

I don't think this is quite right.  Isn't the Flex Bus ID the
"DVSEC ID" (not the "DVSEC Vendor ID")?

> +static int
> +is_flexbus_cap(struct device *d, int where)
> +{
> +  u32 hdr;
> +  u16 w;
> +
> +  if (!config_fetch(d, where + PCI_DVSEC_HEADER1, 8))
> +    return 0;

And here, I think we need to check the "DVSEC Vendor ID" first, i.e.,
in the log below, I guess we'd look for the Intel Vendor ID (0x8086).

We can only decode the capability if *both* the DVSEC Vendor ID
(HEADER1) and the DVSEC ID (HEADER2) match.

> +  /* Check for Designated Vendor-Specific Flex Bus Capable ID */
> +  hdr = get_conf_long(d, where + PCI_DVSEC_HEADER2);
> +  w = BITS(hdr, 0, 16);
> +  if (w == PCI_DVSEC_FLEXBUS_ID)
> +    return 1;
> +
> +  return 0;
> +}
> +
>  static void
>  cap_dvsec(struct device *d, int where)
>  {
> @@ -947,7 +992,10 @@ show_ext_caps(struct device *d, int type)
>  	    printf("Readiness Time Reporting <?>\n");
>  	    break;
>  	  case PCI_EXT_CAP_ID_DVSEC:
> -	    cap_dvsec(d, where);
> +	    if (is_flexbus_cap(d, where))
> +	      cap_cxl(d, where);
> +	    else
> +	      cap_dvsec(d, where);
>  	    break;
>  	  case PCI_EXT_CAP_ID_VF_REBAR:
>  	    printf("VF Resizable BAR <?>\n");

> +        Capabilities: [e00 v1] CXL Designated Vendor-Specific:
> +                CXLCap: Cache+ IO+ Mem+ Mem HW Init+ HDMCount 1 Viral-
> +                CXLCtl: Cache+ IO+ Mem- Cache SF Cov 0 Cache SF Gran 0 Cache Clean- Viral-
> +                CXLSta: Viral-
> +        Capabilities: [e38 v1] Device Serial Number 12-34-56-78-90-00-00-00

> +e00: 23 00 81 e3 86 80 80 03 00 00 1f 00 03 00 00 00
> +e10: 00 00 00 00 00 00 00 00 00 00 00 00 03 01 00 08
> +e20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +e30: 00 00 00 00 00 00 00 00 03 00 01 00 00 00 00 90
> +e40: 78 56 34 12 00 00 00 00 00 00 00 00 00 00 00 00
Sean V Kelley April 14, 2020, 9:01 p.m. UTC | #2
On 14 Apr 2020, at 13:37, Bjorn Helgaas wrote:

> On Mon, Apr 13, 2020 at 08:35:26AM -0700, Sean V Kelley wrote:
>> Compute eXpress Link[1] is a new CPU interconnect created with
>> workload accelerators in mind. The interconnect relies on PCIe
>> electrical and physical interconnect for communication via a Flex Bus
>> port which allows designs to choose between providing PCIe or CXL.
>>
>> This patch introduces basic support for lspci decode of CXL and
>> builds upon the existing Designated Vendor-Specific support in
>> lspci through identification of a Flex Bus capable Vendor ID.
>
> I don't think this is quite right.  Isn't the Flex Bus ID the
> "DVSEC ID" (not the "DVSEC Vendor ID")?

Correct.  It is not really a Flex Bus ID but really a DVSEC ID.  I was 
leaning too heavily on the Spec’s wording which stated: “The DVSEC 
ID is set to 0x0 to advertise that this is an Flex Bus feature 
capability structure.”

I’ll correct.  I was trying to note that CXL depends on Flex Bus 
capability which is identified through the DVSEC ID.  But I confused 
things by also mentioning the Vendor ID.

>
>> +static int
>> +is_flexbus_cap(struct device *d, int where)
>> +{
>> +  u32 hdr;
>> +  u16 w;
>> +
>> +  if (!config_fetch(d, where + PCI_DVSEC_HEADER1, 8))
>> +    return 0;
>
> And here, I think we need to check the "DVSEC Vendor ID" first, i.e.,
> in the log below, I guess we'd look for the Intel Vendor ID (0x8086).

Agree.  Will do.

>
> We can only decode the capability if *both* the DVSEC Vendor ID
> (HEADER1) and the DVSEC ID (HEADER2) match.

Got it.

Thanks,

Sean

>
>> +  /* Check for Designated Vendor-Specific Flex Bus Capable ID */
>> +  hdr = get_conf_long(d, where + PCI_DVSEC_HEADER2);
>> +  w = BITS(hdr, 0, 16);
>> +  if (w == PCI_DVSEC_FLEXBUS_ID)
>> +    return 1;
>> +
>> +  return 0;
>> +}
>> +
>>  static void
>>  cap_dvsec(struct device *d, int where)
>>  {
>> @@ -947,7 +992,10 @@ show_ext_caps(struct device *d, int type)
>>  	    printf("Readiness Time Reporting <?>\n");
>>  	    break;
>>  	  case PCI_EXT_CAP_ID_DVSEC:
>> -	    cap_dvsec(d, where);
>> +	    if (is_flexbus_cap(d, where))
>> +	      cap_cxl(d, where);
>> +	    else
>> +	      cap_dvsec(d, where);
>>  	    break;
>>  	  case PCI_EXT_CAP_ID_VF_REBAR:
>>  	    printf("VF Resizable BAR <?>\n");
>
>> +        Capabilities: [e00 v1] CXL Designated Vendor-Specific:
>> +                CXLCap: Cache+ IO+ Mem+ Mem HW Init+ HDMCount 1 
>> Viral-
>> +                CXLCtl: Cache+ IO+ Mem- Cache SF Cov 0 Cache SF Gran 
>> 0 Cache Clean- Viral-
>> +                CXLSta: Viral-
>> +        Capabilities: [e38 v1] Device Serial Number 
>> 12-34-56-78-90-00-00-00
>
>> +e00: 23 00 81 e3 86 80 80 03 00 00 1f 00 03 00 00 00
>> +e10: 00 00 00 00 00 00 00 00 00 00 00 00 03 01 00 08
>> +e20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> +e30: 00 00 00 00 00 00 00 00 03 00 01 00 00 00 00 90
>> +e40: 78 56 34 12 00 00 00 00 00 00 00 00 00 00 00 00
diff mbox series

Patch

diff --git a/lib/header.h b/lib/header.h
index daeddeb..30b4eba 100644
--- a/lib/header.h
+++ b/lib/header.h
@@ -1045,6 +1045,26 @@ 
 /* PCIe Designated Vendor-Specific Capability */
 #define PCI_DVSEC_HEADER1	4	/* Designated Vendor-Specific Header 1 */
 #define PCI_DVSEC_HEADER2	8	/* Designated Vendor-Specific Header 2 */
+#define PCI_DVSEC_FLEXBUS_ID	0	/* Flex Bus feature capability ID */
+
+/* PCIe CXL Designated Vendor-Specific Capabilities, Control, Status */
+#define PCI_CXL_CAP		0x0a
+#define  PCI_CXL_CAP_CACHE	0x0001
+#define  PCI_CXL_CAP_IO		0x0002
+#define  PCI_CXL_CAP_MEM	0x0004
+#define  PCI_CXL_CAP_MEM_HWINIT	0x0008
+#define  PCI_CXL_CAP_HDM_CNT(x)	(((x) & (3 << 4)) >> 4)
+#define  PCI_CXL_CAP_VIRAL	0x4000
+#define PCI_CXL_CTRL		0x0c
+#define  PCI_CXL_CTRL_CACHE	0x0001
+#define  PCI_CXL_CTRL_IO	0x0002
+#define  PCI_CXL_CTRL_MEM	0x0004
+#define  PCI_CXL_CTRL_CACHE_SF_COV(x)	(((x) & (0x1f << 3)) >> 3)
+#define  PCI_CXL_CTRL_CACHE_SF_GRAN(x)	(((x) & (0x7 << 8)) >> 8)
+#define  PCI_CXL_CTRL_CACHE_CLN	0x0800
+#define  PCI_CXL_CTRL_VIRAL	0x4000
+#define PCI_CXL_STATUS		0x0e
+#define  PCI_CXL_STATUS_VIRAL	0x4000
 
 /* Access Control Services */
 #define PCI_ACS_CAP		0x04	/* ACS Capability Register */
diff --git a/ls-ecaps.c b/ls-ecaps.c
index b82d37e..57f649c 100644
--- a/ls-ecaps.c
+++ b/ls-ecaps.c
@@ -634,6 +634,51 @@  cap_rclink(struct device *d, int where)
     }
 }
 
+static void
+cap_cxl(struct device *d, int where)
+{
+  u16 l;
+
+  printf("CXL Designated Vendor-Specific:\n");
+  if (verbose < 2)
+    return;
+
+  if (!config_fetch(d, where + PCI_CXL_CAP, 12))
+    return;
+
+  l = get_conf_word(d, where + PCI_CXL_CAP);
+  printf("\t\tCXLCap:\tCache%c IO%c Mem%c Mem HW Init%c HDMCount %d Viral%c\n",
+    FLAG(l, PCI_CXL_CAP_CACHE), FLAG(l, PCI_CXL_CAP_IO), FLAG(l, PCI_CXL_CAP_MEM),
+    FLAG(l, PCI_CXL_CAP_MEM_HWINIT), PCI_CXL_CAP_HDM_CNT(l), FLAG(l, PCI_CXL_CAP_VIRAL));
+
+  l = get_conf_word(d, where + PCI_CXL_CTRL);
+  printf("\t\tCXLCtl:\tCache%c IO%c Mem%c Cache SF Cov %d Cache SF Gran %d Cache Clean%c Viral%c\n",
+    FLAG(l, PCI_CXL_CTRL_CACHE), FLAG(l, PCI_CXL_CTRL_IO), FLAG(l, PCI_CXL_CTRL_MEM),
+    PCI_CXL_CTRL_CACHE_SF_COV(l), PCI_CXL_CTRL_CACHE_SF_GRAN(l), FLAG(l, PCI_CXL_CTRL_CACHE_CLN),
+    FLAG(l, PCI_CXL_CTRL_VIRAL));
+
+  l = get_conf_word(d, where + PCI_CXL_STATUS);
+  printf("\t\tCXLSta:\tViral%c\n", FLAG(l, PCI_CXL_STATUS_VIRAL));
+}
+
+static int
+is_flexbus_cap(struct device *d, int where)
+{
+  u32 hdr;
+  u16 w;
+
+  if (!config_fetch(d, where + PCI_DVSEC_HEADER1, 8))
+    return 0;
+
+  /* Check for Designated Vendor-Specific Flex Bus Capable ID */
+  hdr = get_conf_long(d, where + PCI_DVSEC_HEADER2);
+  w = BITS(hdr, 0, 16);
+  if (w == PCI_DVSEC_FLEXBUS_ID)
+    return 1;
+
+  return 0;
+}
+
 static void
 cap_dvsec(struct device *d, int where)
 {
@@ -947,7 +992,10 @@  show_ext_caps(struct device *d, int type)
 	    printf("Readiness Time Reporting <?>\n");
 	    break;
 	  case PCI_EXT_CAP_ID_DVSEC:
-	    cap_dvsec(d, where);
+	    if (is_flexbus_cap(d, where))
+	      cap_cxl(d, where);
+	    else
+	      cap_dvsec(d, where);
 	    break;
 	  case PCI_EXT_CAP_ID_VF_REBAR:
 	    printf("VF Resizable BAR <?>\n");
diff --git a/tests/cap-dvsec-cxl b/tests/cap-dvsec-cxl
new file mode 100644
index 0000000..e5d2745
--- /dev/null
+++ b/tests/cap-dvsec-cxl
@@ -0,0 +1,340 @@ 
+6b:00.0 Unassigned class [ff00]: Intel Corporation Device 0d93
+        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx-
+        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
+        Interrupt: pin A routed to IRQ 255
+        NUMA node: 0
+        Region 0: Memory at b3100000 (32-bit, non-prefetchable) [disabled] [size=1M]
+        Region 2: I/O ports at a400 [disabled] [size=1K]
+        Region 4: Memory at b1000000 (32-bit, prefetchable) [disabled] [size=16M]
+        Capabilities: [40] Express (v2) Root Complex Integrated Endpoint, MSI 00
+                DevCap: MaxPayload 256 bytes, PhantFunc 0
+                        ExtTag+ RBE+ FLReset+
+                DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
+                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- FLReset-
+                        MaxPayload 128 bytes, MaxReadReq 512 bytes
+                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
+                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, NROPrPrP-, LTR+
+                         10BitTagComp-, 10BitTagReq-, OBFF Via WAKE#, ExtFmt+, EETLPPrefix+, MaxEETLPPrefixes 1
+                         EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
+                         FRS-
+                         AtomicOpsCap: 32bit+ 64bit+ 128bitCAS+
+                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
+                         AtomicOpsCtl: ReqEn-
+        Capabilities: [80] MSI: Enable- Count=1/4 Maskable+ 64bit+
+                Address: 0000000000000000  Data: 0000
+                Masking: 00000000  Pending: 00000000
+        Capabilities: [a0] Power Management version 3
+                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
+                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
+        Capabilities: [100 v1] Advanced Error Reporting
+                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
+                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
+                UESvrt: DLP+ SDES- TLP+ FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
+                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr-
+                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
+                AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn+ ECRCChkCap+ ECRCChkEn+
+                        MultHdrRecCap+ MultHdrRecEn- TLPPfxPres- HdrLogCap-
+                HeaderLog: 00000000 00000000 00000000 00000000
+        Capabilities: [200 v1] Multi-Function Virtual Channel <?>
+        Capabilities: [300 v1] Virtual Channel
+                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
+                Arb:    Fixed- WRR32- WRR64- WRR128-
+                Ctrl:   ArbSelect=Fixed
+                Status: InProgress-
+                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
+                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
+                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
+                        Status: NegoPending- InProgress-
+        Capabilities: [550 v1] Multicast
+                McastCap: MaxGroups 64, WindowSz 1 (2 bytes)            McastCtl: NumGroups 1, Enable-
+                McastBAR: IndexPos 0, BaseAddr 0000000000000000
+                McastReceiveVec:      0000000000000000
+                McastBlockAllVec:     0000000000000000
+                McastBlockUntransVec: 0000000000000000
+        Capabilities: [588 v1] Latency Tolerance Reporting
+                Max snoop latency: 0ns
+                Max no snoop latency: 0ns
+        Capabilities: [5b0 v1] Transaction Processing Hints
+                Extended requester support
+                Steering table in TPH capability structure
+        Capabilities: [6e0 v1] Address Translation Service (ATS)
+                ATSCap: Invalidate Queue Depth: 00
+                ATSCtl: Enable-, Smallest Translation Unit: 00
+        Capabilities: [700 v1] Resizable BAR <?>
+        Capabilities: [714 v1] Secondary PCI Express
+                LnkCtl3: LnkEquIntrruptEn-, PerformEqu-
+                LaneErrStat: 0
+        Capabilities: [b20 v1] Page Request Interface (PRI)
+                PRICtl: Enable- Reset-
+                PRISta: RF- UPRGI- Stopped+
+                Page Request Capacity: 00000000, Page Request Allocation: 00000000
+        Capabilities: [b40 v1] Process Address Space ID (PASID)
+                PASIDCap: Exec+ Priv+, Max PASID Width: 14
+                PASIDCtl: Enable- Exec- Priv-
+        Capabilities: [b50 v1] Precision Time Measurement
+                PTMCap: Requester:- Responder:- Root:-
+                PTMClockGranularity: Unimplemented
+                PTMControl: Enabled:- RootSelected:-
+                PTMEffectiveGranularity: Unknown
+        Capabilities: [d00 v1] Vendor Specific Information: ID=0040 Rev=1 Len=04c <?>
+        Capabilities: [e00 v1] CXL Designated Vendor-Specific:
+                CXLCap: Cache+ IO+ Mem+ Mem HW Init+ HDMCount 1 Viral-
+                CXLCtl: Cache+ IO+ Mem- Cache SF Cov 0 Cache SF Gran 0 Cache Clean- Viral-
+                CXLSta: Viral-
+        Capabilities: [e38 v1] Device Serial Number 12-34-56-78-90-00-00-00
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