diff mbox series

[v2,01/17] xen/pci: Refactor MSI code that implements MSI functionality within XEN

Message ID 27a7c53a862c0c8dcbe4ecef203d5efeee5746a8.1632307952.git.rahul.singh@arm.com (mailing list archive)
State Superseded
Headers show
Series PCI devices passthrough on Arm | expand

Commit Message

Rahul Singh Sept. 22, 2021, 11:34 a.m. UTC 
On Arm, the initial plan is to only support GICv3 ITS which doesn't
require us to manage the MSIs because the HW will protect against
spoofing. Move the code under CONFIG_HAS_PCI_MSI flag to gate the code
for ARM.

No functional change intended.

Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Reviewed-by: Daniel P. Smith <dpsmith@apertussolutions.com>
---
Change in v2: Fixed minor comments
---
 xen/arch/x86/Kconfig             |  1 +
 xen/drivers/passthrough/Makefile |  1 +
 xen/drivers/passthrough/msi.c    | 83 ++++++++++++++++++++++++++++++++
 xen/drivers/passthrough/pci.c    | 54 +++++----------------
 xen/drivers/pci/Kconfig          |  4 ++
 xen/include/xen/msi.h            | 43 +++++++++++++++++
 xen/xsm/flask/hooks.c            |  8 +--
 7 files changed, 149 insertions(+), 45 deletions(-)
 create mode 100644 xen/drivers/passthrough/msi.c
 create mode 100644 xen/include/xen/msi.h
diff mbox series

Patch

diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index 1f83518ee0..b4abfca46f 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -20,6 +20,7 @@  config X86
 	select HAS_NS16550
 	select HAS_PASSTHROUGH
 	select HAS_PCI
+	select HAS_PCI_MSI
 	select HAS_PDX
 	select HAS_SCHED_GRANULARITY
 	select HAS_UBSAN
diff --git a/xen/drivers/passthrough/Makefile b/xen/drivers/passthrough/Makefile
index 445690e3e5..a5efa22714 100644
--- a/xen/drivers/passthrough/Makefile
+++ b/xen/drivers/passthrough/Makefile
@@ -7,3 +7,4 @@  obj-y += iommu.o
 obj-$(CONFIG_HAS_PCI) += pci.o
 obj-$(CONFIG_HAS_DEVICE_TREE) += device_tree.o
 obj-$(CONFIG_HAS_PCI) += ats.o
+obj-$(CONFIG_HAS_PCI_MSI) += msi.o
diff --git a/xen/drivers/passthrough/msi.c b/xen/drivers/passthrough/msi.c
new file mode 100644
index 0000000000..ce1a450f6f
--- /dev/null
+++ b/xen/drivers/passthrough/msi.c
@@ -0,0 +1,83 @@ 
+#include <xen/init.h>
+#include <xen/pci.h>
+#include <xen/msi.h>
+#include <asm/hvm/io.h>
+
+int pdev_msix_assign(struct domain *d, struct pci_dev *pdev)
+{
+    int rc;
+
+    if ( pdev->msix )
+    {
+        rc = pci_reset_msix_state(pdev);
+        if ( rc )
+            return rc;
+        msixtbl_init(d);
+    }
+
+    return 0;
+}
+
+int pdev_msi_init(struct pci_dev *pdev)
+{
+    unsigned int pos;
+
+    INIT_LIST_HEAD(&pdev->msi_list);
+
+    pos = pci_find_cap_offset(pdev->seg, pdev->bus, PCI_SLOT(pdev->devfn),
+                              PCI_FUNC(pdev->devfn), PCI_CAP_ID_MSI);
+    if ( pos )
+    {
+        uint16_t ctrl = pci_conf_read16(pdev->sbdf, msi_control_reg(pos));
+
+        pdev->msi_maxvec = multi_msi_capable(ctrl);
+    }
+
+    pos = pci_find_cap_offset(pdev->seg, pdev->bus, PCI_SLOT(pdev->devfn),
+                              PCI_FUNC(pdev->devfn), PCI_CAP_ID_MSIX);
+    if ( pos )
+    {
+        struct arch_msix *msix = xzalloc(struct arch_msix);
+        uint16_t ctrl;
+
+        if ( !msix )
+            return -ENOMEM;
+
+        spin_lock_init(&msix->table_lock);
+
+        ctrl = pci_conf_read16(pdev->sbdf, msix_control_reg(pos));
+        msix->nr_entries = msix_table_size(ctrl);
+
+        pdev->msix = msix;
+    }
+
+    return 0;
+}
+
+void pdev_msi_deinit(struct pci_dev *pdev)
+{
+    XFREE(pdev->msix);
+}
+
+void pdev_dump_msi(const struct pci_dev *pdev)
+{
+    const struct msi_desc *msi;
+
+    if ( list_empty(&pdev->msi_list) )
+        return;
+
+    printk(" - MSIs < ");
+    list_for_each_entry ( msi, &pdev->msi_list, list )
+        printk("%d ", msi->irq);
+    printk(">");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index fc4fa2e5c3..8996403161 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -32,8 +32,8 @@ 
 #include <xen/softirq.h>
 #include <xen/tasklet.h>
 #include <xen/vpci.h>
+#include <xen/msi.h>
 #include <xsm/xsm.h>
-#include <asm/msi.h>
 #include "ats.h"
 
 struct pci_seg {
@@ -314,6 +314,7 @@  static struct pci_dev *alloc_pdev(struct pci_seg *pseg, u8 bus, u8 devfn)
 {
     struct pci_dev *pdev;
     unsigned int pos;
+    int rc;
 
     list_for_each_entry ( pdev, &pseg->alldevs_list, alldevs_list )
         if ( pdev->bus == bus && pdev->devfn == devfn )
@@ -327,35 +328,12 @@  static struct pci_dev *alloc_pdev(struct pci_seg *pseg, u8 bus, u8 devfn)
     *((u8*) &pdev->bus) = bus;
     *((u8*) &pdev->devfn) = devfn;
     pdev->domain = NULL;
-    INIT_LIST_HEAD(&pdev->msi_list);
-
-    pos = pci_find_cap_offset(pseg->nr, bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
-                              PCI_CAP_ID_MSI);
-    if ( pos )
-    {
-        uint16_t ctrl = pci_conf_read16(pdev->sbdf, msi_control_reg(pos));
-
-        pdev->msi_maxvec = multi_msi_capable(ctrl);
-    }
 
-    pos = pci_find_cap_offset(pseg->nr, bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
-                              PCI_CAP_ID_MSIX);
-    if ( pos )
+    rc = pdev_msi_init(pdev);
+    if ( rc )
     {
-        struct arch_msix *msix = xzalloc(struct arch_msix);
-        uint16_t ctrl;
-
-        if ( !msix )
-        {
-            xfree(pdev);
-            return NULL;
-        }
-        spin_lock_init(&msix->table_lock);
-
-        ctrl = pci_conf_read16(pdev->sbdf, msix_control_reg(pos));
-        msix->nr_entries = msix_table_size(ctrl);
-
-        pdev->msix = msix;
+        xfree(pdev);
+        return NULL;
     }
 
     list_add(&pdev->alldevs_list, &pseg->alldevs_list);
@@ -449,7 +427,7 @@  static void free_pdev(struct pci_seg *pseg, struct pci_dev *pdev)
     }
 
     list_del(&pdev->alldevs_list);
-    xfree(pdev->msix);
+    pdev_msi_deinit(pdev);
     xfree(pdev);
 }
 
@@ -1271,18 +1249,16 @@  bool_t pcie_aer_get_firmware_first(const struct pci_dev *pdev)
 static int _dump_pci_devices(struct pci_seg *pseg, void *arg)
 {
     struct pci_dev *pdev;
-    struct msi_desc *msi;
 
     printk("==== segment %04x ====\n", pseg->nr);
 
     list_for_each_entry ( pdev, &pseg->alldevs_list, alldevs_list )
     {
-        printk("%pp - %pd - node %-3d - MSIs < ",
+        printk("%pp - %pd - node %-3d",
                &pdev->sbdf, pdev->domain,
                (pdev->node != NUMA_NO_NODE) ? pdev->node : -1);
-        list_for_each_entry ( msi, &pdev->msi_list, list )
-               printk("%d ", msi->irq);
-        printk(">\n");
+        pdev_dump_msi(pdev);
+        printk("\n");
     }
 
     return 0;
@@ -1422,13 +1398,9 @@  static int assign_device(struct domain *d, u16 seg, u8 bus, u8 devfn, u32 flag)
     ASSERT(pdev && (pdev->domain == hardware_domain ||
                     pdev->domain == dom_io));
 
-    if ( pdev->msix )
-    {
-        rc = pci_reset_msix_state(pdev);
-        if ( rc )
-            goto done;
-        msixtbl_init(d);
-    }
+    rc = pdev_msix_assign(d, pdev);
+    if ( rc )
+        goto done;
 
     pdev->fault.count = 0;
 
diff --git a/xen/drivers/pci/Kconfig b/xen/drivers/pci/Kconfig
index 7da03fa13b..c6a7bc8007 100644
--- a/xen/drivers/pci/Kconfig
+++ b/xen/drivers/pci/Kconfig
@@ -1,3 +1,7 @@ 
 
 config HAS_PCI
 	bool
+
+config HAS_PCI_MSI
+	bool
+	depends on HAS_PCI
diff --git a/xen/include/xen/msi.h b/xen/include/xen/msi.h
new file mode 100644
index 0000000000..c903d0050c
--- /dev/null
+++ b/xen/include/xen/msi.h
@@ -0,0 +1,43 @@ 
+#ifndef __XEN_MSI_H_
+#define __XEN_MSI_H_
+
+#include <xen/pci.h>
+
+#ifdef CONFIG_HAS_PCI_MSI
+
+#include <asm/msi.h>
+
+int pdev_msix_assign(struct domain *d, struct pci_dev *pdev);
+int pdev_msi_init(struct pci_dev *pdev);
+void pdev_msi_deinit(struct pci_dev *pdev);
+void pdev_dump_msi(const struct pci_dev *pdev);
+
+#else /* !CONFIG_HAS_PCI_MSI */
+
+static inline int pdev_msix_assign(struct domain *d, struct pci_dev *pdev)
+{
+    return 0;
+}
+
+static inline int pdev_msi_init(struct pci_dev *pdev)
+{
+    return 0;
+}
+
+static inline void pdev_msi_deinit(struct pci_dev *pdev) {}
+static inline void pci_cleanup_msi(struct pci_dev *pdev) {}
+static inline void pdev_dump_msi(const struct pci_dev *pdev) {}
+
+#endif /* CONFIG_HAS_PCI_MSI */
+
+#endif /* __XEN_MSI_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 25e87180b4..ea9a12bd71 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -21,7 +21,7 @@ 
 #include <xen/guest_access.h>
 #include <xen/xenoprof.h>
 #include <xen/iommu.h>
-#ifdef CONFIG_HAS_PCI
+#ifdef CONFIG_HAS_PCI_MSI
 #include <asm/msi.h>
 #endif
 #include <public/xen.h>
@@ -114,7 +114,7 @@  static int get_irq_sid(int irq, u32 *sid, struct avc_audit_data *ad)
         }
         return security_irq_sid(irq, sid);
     }
-#ifdef CONFIG_HAS_PCI
+#ifdef CONFIG_HAS_PCI_MSI
     {
         struct irq_desc *desc = irq_to_desc(irq);
         if ( desc->msi_desc && desc->msi_desc->dev ) {
@@ -874,7 +874,7 @@  static int flask_map_domain_pirq (struct domain *d)
 static int flask_map_domain_msi (struct domain *d, int irq, const void *data,
                                  u32 *sid, struct avc_audit_data *ad)
 {
-#ifdef CONFIG_HAS_PCI
+#ifdef CONFIG_HAS_PCI_MSI
     const struct msi_info *msi = data;
     u32 machine_bdf = (msi->seg << 16) | (msi->bus << 8) | msi->devfn;
 
@@ -940,7 +940,7 @@  static int flask_unmap_domain_pirq (struct domain *d)
 static int flask_unmap_domain_msi (struct domain *d, int irq, const void *data,
                                    u32 *sid, struct avc_audit_data *ad)
 {
-#ifdef CONFIG_HAS_PCI
+#ifdef CONFIG_HAS_PCI_MSI
     const struct pci_dev *pdev = data;
     u32 machine_bdf = (pdev->seg << 16) | (pdev->bus << 8) | pdev->devfn;