cxl: Export optional AFU configuration record in sysfs

An AFU may optionally contain one or more PCIe like configuration
records, which can be used to identify the AFU.

This patch adds support for exposing the raw config space and the
vendor, device and class code under sysfs. These will appear in a
subdirectory of the AFU device corresponding with the configuration
record number, e.g.

cat /sys/class/cxl/afu0.0/cr0/vendor
0x1014

cat /sys/class/cxl/afu0.0/cr0/device
0x4350

cat /sys/class/cxl/afu0.0/cr0/class
0x120000

hexdump -C /sys/class/cxl/afu0.0/cr0/config
00000000  14 10 50 43 00 00 00 00  06 00 00 12 00 00 00 00  |..PC............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000100

These files behave in much the same way as the equivalent files for PCI
devices, with one exception being that the config file is currently
read-only and restricted to the root user. It is not necessarily
required to be this strict, but we currently do not have a compelling
use-case to make it writable and/or world-readable, so I erred on the
side of being restrictive.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index cb250673b5c6..2b2e1b80d759 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -114,6 +114,24 @@
 #define   AFUD_EB_LEN(val)              EXTRACT_PPC_BITS(val, 8, 63)
 #define AFUD_READ_EB_OFF(afu)           AFUD_READ(afu, 0x48)
 
+u16 cxl_afu_cr_read16(struct cxl_afu *afu, int cr, u64 off)
+{
+        u64 aligned_off = off & ~0x3L;
+        u32 val;
+
+        val = cxl_afu_cr_read32(afu, cr, aligned_off);
+        return (val >> ((off & 0x2) * 8)) & 0xffff;
+}
+
+u8 cxl_afu_cr_read8(struct cxl_afu *afu, int cr, u64 off)
+{
+        u64 aligned_off = off & ~0x3L;
+        u32 val;
+
+        val = cxl_afu_cr_read32(afu, cr, aligned_off);
+        return (val >> ((off & 0x3) * 8)) & 0xff;
+}
+
 static DEFINE_PCI_DEVICE_TABLE(cxl_pci_tbl) = {
         { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0477), },
         { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x044b), },
@@ -556,6 +574,7 @@ static int cxl_read_afu_descriptor(struct cxl_afu *afu)
         val = AFUD_READ_INFO(afu);
         afu->pp_irqs = AFUD_NUM_INTS_PER_PROC(val);
         afu->max_procs_virtualised = AFUD_NUM_PROCS(val);
+        afu->crs_num = AFUD_NUM_CRS(val);
 
         if (AFUD_AFU_DIRECTED(val))
                 afu->modes_supported |= CXL_MODE_DIRECTED;
@@ -570,6 +589,10 @@ static int cxl_read_afu_descriptor(struct cxl_afu *afu)
         if ((afu->pp_psa = AFUD_PPPSA_PP(val)))
                 afu->pp_offset = AFUD_READ_PPPSA_OFF(afu);
 
+        val = AFUD_READ_CR(afu);
+        afu->crs_len = AFUD_CR_LEN(val) * 256;
+        afu->crs_offset = AFUD_READ_CR_OFF(afu);
+
         return 0;
 }