---

yaml --- r: 174751 b: refs/heads/master c: ae21ee6 h: refs/heads/master i: 174749: b2a4967 174747: 109187b 174743: d435de9 174735: dc944d0 174719: 54ce1bc v: v3
git-mirror · Nov 4, 2009 · 11e9743 · 11e9743
1 parent cc644d8
commit 11e9743
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Showing 5 changed files with 56 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1ccbf5344c3daef046d2323190cc6807c44f1917
+refs/heads/master: ae21ee65e8bc228416bbcc8a1da01c56a847a60c
diff --git a/trunk/drivers/pci/pci.c b/trunk/drivers/pci/pci.c
@@ -1545,6 +1545,41 @@ void pci_enable_ari(struct pci_dev *dev)
 	bridge->ari_enabled = 1;
 }
 
+/**
+ * pci_enable_acs - enable ACS if hardware support it
+ * @dev: the PCI device
+ */
+void pci_enable_acs(struct pci_dev *dev)
+{
+	int pos;
+	u16 cap;
+	u16 ctrl;
+
+	if (!dev->is_pcie)
+		return;
+
+	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
+	if (!pos)
+		return;
+
+	pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
+	pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
+
+	/* Source Validation */
+	ctrl |= (cap & PCI_ACS_SV);
+
+	/* P2P Request Redirect */
+	ctrl |= (cap & PCI_ACS_RR);
+
+	/* P2P Completion Redirect */
+	ctrl |= (cap & PCI_ACS_CR);
+
+	/* Upstream Forwarding */
+	ctrl |= (cap & PCI_ACS_UF);
+
+	pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
+}
+
 /**
  * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
  * @dev: the PCI device

diff --git a/trunk/drivers/pci/pci.h b/trunk/drivers/pci/pci.h
@@ -311,4 +311,6 @@ static inline int pci_resource_alignment(struct pci_dev *dev,
 	return resource_alignment(res);
 }
 
+extern void pci_enable_acs(struct pci_dev *dev);
+
 #endif /* DRIVERS_PCI_H */
diff --git a/trunk/drivers/pci/probe.c b/trunk/drivers/pci/probe.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/cpumask.h>
 #include <linux/pci-aspm.h>
+#include <linux/iommu.h>
 #include "pci.h"
 
 #define CARDBUS_LATENCY_TIMER	176	/* secondary latency timer */
@@ -1004,6 +1005,10 @@ static void pci_init_capabilities(struct pci_dev *dev)
 
 	/* Single Root I/O Virtualization */
 	pci_iov_init(dev);
+
+	/* Enable ACS P2P upstream forwarding */
+	if (iommu_found())
+		pci_enable_acs(dev);
 }
 
 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)

diff --git a/trunk/include/linux/pci_regs.h b/trunk/include/linux/pci_regs.h
@@ -502,6 +502,7 @@
 #define PCI_EXT_CAP_ID_VC	2
 #define PCI_EXT_CAP_ID_DSN	3
 #define PCI_EXT_CAP_ID_PWR	4
+#define PCI_EXT_CAP_ID_ACS	13
 #define PCI_EXT_CAP_ID_ARI	14
 #define PCI_EXT_CAP_ID_ATS	15
 #define PCI_EXT_CAP_ID_SRIOV	16
@@ -662,4 +663,16 @@
 #define  PCI_SRIOV_VFM_MO	0x2	/* Active.MigrateOut */
 #define  PCI_SRIOV_VFM_AV	0x3	/* Active.Available */
 
+/* Access Control Service */
+#define PCI_ACS_CAP		0x04	/* ACS Capability Register */
+#define  PCI_ACS_SV		0x01	/* Source Validation */
+#define  PCI_ACS_TB		0x02	/* Translation Blocking */
+#define  PCI_ACS_RR		0x04	/* P2P Request Redirect */
+#define  PCI_ACS_CR		0x08	/* P2P Completion Redirect */
+#define  PCI_ACS_UF		0x10	/* Upstream Forwarding */
+#define  PCI_ACS_EC		0x20	/* P2P Egress Control */
+#define  PCI_ACS_DT		0x40	/* Direct Translated P2P */
+#define PCI_ACS_CTRL		0x06	/* ACS Control Register */
+#define PCI_ACS_EGRESS_CTL_V	0x08	/* ACS Egress Control Vector */
+
 #endif /* LINUX_PCI_REGS_H */