linux-kernel - [PATCH v8 1/5] PCI: Add INTx Mechanism Messages macros

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Date: Thu, 18 Apr 2024 12:04:24 -0400
From: Frank Li <Frank.Li@....com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>, 
 Gustavo Pimentel <gustavo.pimentel@...opsys.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, imx@...ts.linux.dev
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Frank Li <Frank.Li@....com>, 
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
 Serge Semin <fancer.lancer@...il.com>
Subject: [PATCH v8 1/5] PCI: Add INTx Mechanism Messages macros

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

Add "Message Routing" and "INTx Mechanism Messages" macros to enable
a PCIe driver to send messages for INTx Interrupt Signaling.

The "Message Routing" is in the section 2.2.8, and the "INTx Mechanism
Messages" is in the section 2.2.8.1 on the PCI Express Base Specification,
Rev 6.1.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/pci/pci.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 17fed18468474..02f46875fe2d9 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -22,6 +22,24 @@
  */
 #define PCIE_PME_TO_L2_TIMEOUT_US	10000
 
+/* Message Routing (r[2:0]); PCIe r6.0, sec 2.2.8 */
+#define PCIE_MSG_TYPE_R_RC	0
+#define PCIE_MSG_TYPE_R_ADDR	1
+#define PCIE_MSG_TYPE_R_ID	2
+#define PCIE_MSG_TYPE_R_BC	3
+#define PCIE_MSG_TYPE_R_LOCAL	4
+#define PCIE_MSG_TYPE_R_GATHER	5
+
+/* INTx Mechanism Messages; PCIe r6.0, sec 2.2.8.1 */
+#define PCIE_MSG_CODE_ASSERT_INTA	0x20
+#define PCIE_MSG_CODE_ASSERT_INTB	0x21
+#define PCIE_MSG_CODE_ASSERT_INTC	0x22
+#define PCIE_MSG_CODE_ASSERT_INTD	0x23
+#define PCIE_MSG_CODE_DEASSERT_INTA	0x24
+#define PCIE_MSG_CODE_DEASSERT_INTB	0x25
+#define PCIE_MSG_CODE_DEASSERT_INTC	0x26
+#define PCIE_MSG_CODE_DEASSERT_INTD	0x27
+
 extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
 

-- 
2.34.1