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From 369e0346a0e54c96ef8776bd32d810c4e1cbbb1d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Tue, 16 Nov 2021 16:53:33 +0100
Subject: [PATCH 16/90] PCI: pci-bridge-emul: Add support for new flag
PCI_BRIDGE_EMUL_NO_IO_FORWARD
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Like PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD, this new flag specifies that
emulated PCI bridge does not support forwarding of IO requests in given
range between primary and secondary buses. This flag should be used as
argument for pci_bridge_emul_init() for hardware setup without IO support.
Setting this flag cause that IO base and limit registers are read-only.
Signed-off-by: Pali Rohár <pali@kernel.org>
---
drivers/pci/pci-bridge-emul.c | 9 +++++++++
drivers/pci/pci-bridge-emul.h | 6 ++++++
2 files changed, 15 insertions(+)
diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c
index ceacba03e714..a16f9e30099e 100644
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -382,6 +382,15 @@ int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0;
}
+ if (flags & PCI_BRIDGE_EMUL_NO_IO_FORWARD) {
+ bridge->pci_regs_behavior[PCI_COMMAND / 4].ro |= PCI_COMMAND_IO;
+ bridge->pci_regs_behavior[PCI_COMMAND / 4].rw &= ~PCI_COMMAND_IO;
+ bridge->pci_regs_behavior[PCI_IO_BASE / 4].ro |= GENMASK(15, 0);
+ bridge->pci_regs_behavior[PCI_IO_BASE / 4].rw &= ~GENMASK(15, 0);
+ bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].ro = ~0;
+ bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].rw = 0;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(pci_bridge_emul_init);
diff --git a/drivers/pci/pci-bridge-emul.h b/drivers/pci/pci-bridge-emul.h
index 087b5fa01bcf..4953274cac18 100644
--- a/drivers/pci/pci-bridge-emul.h
+++ b/drivers/pci/pci-bridge-emul.h
@@ -125,6 +125,12 @@ enum {
* requests between primary and secondary buses.
*/
PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD = BIT(0),
+
+ /*
+ * PCI bridge does not support forwarding of IO requests between
+ * primary and secondary buses.
+ */
+ PCI_BRIDGE_EMUL_NO_IO_FORWARD = BIT(1),
};
int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
--
2.34.1
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