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authorMatthew Gerlach <matthew.gerlach@linux.intel.com>2022-05-05 06:06:17 -0400
committerXu Yilun <yilun.xu@intel.com>2022-05-10 16:05:38 +0800
commitae23f746d7442909a19bd43397b567145d6e5db3 (patch)
treea9fd2fa3bcb41b23ee96dbbfe589c1804c6fd7b1 /drivers/fpga
parent2b28c9e0fe97fa2bae2ab52540a2970c0d3bdf8d (diff)
downloadlinux-ae23f746d7442909a19bd43397b567145d6e5db3.tar.bz2
fpga: dfl: Allow Port to be linked to FME's DFL
Currently we use PORTn_OFFSET to locate PORT DFLs, and PORT DFLs are not connected FME DFL. But for some cases (e.g. Intel Open FPGA Stack device), PORT DFLs are connected to FME DFL directly, so we don't need to search PORT DFLs via PORTn_OFFSET again. If BAR value of PORTn_OFFSET is 0x7 (FME_PORT_OFST_BAR_SKIP) then driver will skip searching the DFL for that port. If BAR value is invalid, return -EINVAL. Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com> Acked-by: Wu Hao <hao.wu@intel.com> Link: https://lore.kernel.org/r/20220505100617.703672-1-tianfei.zhang@intel.com Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/dfl-pci.c9
-rw-r--r--drivers/fpga/dfl.h1
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
index 717ac9715970..fd1fa55c9113 100644
--- a/drivers/fpga/dfl-pci.c
+++ b/drivers/fpga/dfl-pci.c
@@ -259,6 +259,15 @@ static int find_dfls_by_default(struct pci_dev *pcidev,
*/
bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
+ if (bar == FME_PORT_OFST_BAR_SKIP) {
+ continue;
+ } else if (bar >= PCI_STD_NUM_BARS) {
+ dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
+ bar, i);
+ ret = -EINVAL;
+ break;
+ }
+
start = pci_resource_start(pcidev, bar) + offset;
len = pci_resource_len(pcidev, bar) - offset;
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 53572c7aced0..06cfcd5e84bb 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -89,6 +89,7 @@
#define FME_HDR_NEXT_AFU NEXT_AFU
#define FME_HDR_CAP 0x30
#define FME_HDR_PORT_OFST(n) (0x38 + ((n) * 0x8))
+#define FME_PORT_OFST_BAR_SKIP 7
#define FME_HDR_BITSTREAM_ID 0x60
#define FME_HDR_BITSTREAM_MD 0x68