linux-kernel - [PATCH V2 4/4] PCI: endpoint: Add deinit in epf test driver

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Message-ID: <20221013181815.2133-5-vidyas@nvidia.com>
Date:   Thu, 13 Oct 2022 23:48:15 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <lpieralisi@...nel.org>, <robh@...nel.org>, <kw@...ux.com>,
        <bhelgaas@...gle.com>, <mani@...nel.org>, <kishon@...com>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH V2 4/4] PCI: endpoint: Add deinit in epf test driver

Add support for clearing the BAR info during the deinitialization phase of
the epf test driver.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V2:
* This is a new patch in this series

 drivers/pci/endpoint/functions/pci-epf-test.c | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 136470019a24..25ac3d161fac 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -826,6 +826,35 @@ static int pci_epf_test_core_init(struct pci_epf *epf)
 	return 0;
 }
 
+static int pci_epf_test_clear_bar(struct pci_epf *epf)
+{
+	int bar, add;
+	struct pci_epf_bar *epf_bar;
+	struct pci_epc *epc = epf->epc;
+	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
+	const struct pci_epc_features *epc_features;
+
+	epc_features = epf_test->epc_features;
+
+	for (bar = 0; bar < PCI_STD_NUM_BARS; bar += add) {
+		epf_bar = &epf->bar[bar];
+		add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1;
+
+		if (!!(epc_features->reserved_bar & (1 << bar)))
+			continue;
+
+		pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no, epf_bar);
+	}
+
+	return 0;
+}
+
+static int pci_epf_test_core_deinit(struct pci_epf *epf)
+{
+	pci_epf_test_clear_bar(epf);
+	return 0;
+}
+
 int pci_epf_test_link_up(struct pci_epf *epf)
 {
 	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
@@ -839,6 +868,7 @@ int pci_epf_test_link_up(struct pci_epf *epf)
 static const struct pci_epc_event_ops pci_epf_test_event_ops = {
 	.core_init = pci_epf_test_core_init,
 	.link_up = pci_epf_test_link_up,
+	.core_deinit = pci_epf_test_core_deinit,
 };
 
 static int pci_epf_test_alloc_space(struct pci_epf *epf)
-- 
2.17.1