linux-kernel - [PATCH] fpga: dfl: pci: generalize find_dfls_by

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Message-Id: <20211113221252.4062704-1-trix@redhat.com>
Date:   Sat, 13 Nov 2021 14:12:52 -0800
From:   trix@...hat.com
To:     hao.wu@...el.com, mdf@...nel.org, yilun.xu@...el.com
Cc:     linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] fpga: dfl: pci: generalize find_dfls_by_vsec()

From: Tom Rix <trix@...hat.com>

find_dfls_by_vsec() is a general dfl function.
Although dfl has multiple vendors, only Intel is supported.
Move vsec and vendor id to an array variable.
Other vendors can append the array to enable their support.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/fpga/dfl-pci.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
index 4d68719e608f..9dc0815c8274 100644
--- a/drivers/fpga/dfl-pci.c
+++ b/drivers/fpga/dfl-pci.c
@@ -136,19 +136,36 @@ static int *cci_pci_create_irq_table(struct pci_dev *pcidev, unsigned int nvec)
 	return table;
 }
 
-static int find_dfls_by_vsec(struct pci_dev *pcidev, struct dfl_fpga_enum_info *info)
+struct dfl_vsec {
+	u16 vendor;
+	u16 id;
+};
+
+static struct dfl_vsec vsecs[] = {
+	{ PCI_VENDOR_ID_INTEL, PCI_VSEC_ID_INTEL_DFLS },
+};
+
+static int find_dfls_by_vsec(struct pci_dev *pcidev,
+			     struct dfl_fpga_enum_info *info)
 {
 	u32 bir, offset, vndr_hdr, dfl_cnt, dfl_res;
 	int dfl_res_off, i, bars, voff = 0;
 	resource_size_t start, len;
 
-	while ((voff = pci_find_next_ext_capability(pcidev, voff, PCI_EXT_CAP_ID_VNDR))) {
-		vndr_hdr = 0;
-		pci_read_config_dword(pcidev, voff + PCI_VNDR_HEADER, &vndr_hdr);
+	for (i = 0; i < ARRAY_SIZE(vsecs); i++) {
+		if (pcidev->vendor != vsecs[i].vendor)
+			continue;
+
+		while ((voff =
+			pci_find_next_ext_capability(pcidev, voff,
+						     PCI_EXT_CAP_ID_VNDR))) {
+			vndr_hdr = 0;
+			pci_read_config_dword(pcidev, voff + PCI_VNDR_HEADER,
+					      &vndr_hdr);
 
-		if (PCI_VNDR_HEADER_ID(vndr_hdr) == PCI_VSEC_ID_INTEL_DFLS &&
-		    pcidev->vendor == PCI_VENDOR_ID_INTEL)
-			break;
+			if (PCI_VNDR_HEADER_ID(vndr_hdr) == vsecs[i].id)
+				break;
+		}
 	}
 
 	if (!voff) {
-- 
2.26.3