linux-kernel - [PATCH v2 1/6] PCI: Add INTx Mechanism Messages macros

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Date: Thu, 01 Feb 2024 11:13:25 -0500
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 v2 1/6] 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 2336a8d1edab2..fe42f5d10b010 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]) */
+#define PCI_MSG_TYPE_R_RC	0
+#define PCI_MSG_TYPE_R_ADDR	1
+#define PCI_MSG_TYPE_R_ID	2
+#define PCI_MSG_TYPE_R_BC	3
+#define PCI_MSG_TYPE_R_LOCAL	4
+#define PCI_MSG_TYPE_R_GATHER	5
+
+/* INTx Mechanism Messages */
+#define PCI_MSG_CODE_ASSERT_INTA	0x20
+#define PCI_MSG_CODE_ASSERT_INTB	0x21
+#define PCI_MSG_CODE_ASSERT_INTC	0x22
+#define PCI_MSG_CODE_ASSERT_INTD	0x23
+#define PCI_MSG_CODE_DEASSERT_INTA	0x24
+#define PCI_MSG_CODE_DEASSERT_INTB	0x25
+#define PCI_MSG_CODE_DEASSERT_INTC	0x26
+#define PCI_MSG_CODE_DEASSERT_INTD	0x27
+
 extern const unsigned char pcie_link_speed[];
 extern bool pci_early_dump;
 

-- 
2.34.1