libxl: Move libxl_device_pci_reset to libxl_pci.c

Signed-off-by: Gianni Tedesco <gianni.tedesco@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
index 76cef09bf5..3b2af3709e 100644
--- a/tools/libxl/libxl_pci.c
+++ b/tools/libxl/libxl_pci.c
@@ -536,3 +536,36 @@ int libxl_device_pci_init(libxl_device_pci *pcidev, unsigned int domain,
     return 0;
 }
 
+int libxl_device_pci_reset(libxl_ctx *ctx, unsigned int domain, unsigned int bus,
+                         unsigned int dev, unsigned int func)
+{
+    char *reset = "/sys/bus/pci/drivers/pciback/do_flr";
+    int fd, rc;
+
+    fd = open(reset, O_WRONLY);
+    if (fd > 0) {
+        char *buf = libxl_sprintf(ctx, PCI_BDF, domain, bus, dev, func);
+        rc = write(fd, buf, strlen(buf));
+        if (rc < 0)
+            XL_LOG(ctx, XL_LOG_ERROR, "write to %s returned %d", reset, rc);
+        close(fd);
+        return rc < 0 ? rc : 0;
+    }
+    if (errno != ENOENT)
+        XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Failed to access pciback path %s", reset);
+    reset = libxl_sprintf(ctx, "/sys/bus/pci/devices/"PCI_BDF"/reset", domain, bus, dev, func);
+    fd = open(reset, O_WRONLY);
+    if (fd > 0) {
+        rc = write(fd, "1", 1);
+        if (rc < 0)
+            XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "write to %s returned %d", reset, rc);
+        close(fd);
+        return rc < 0 ? rc : 0;
+    }
+    if (errno == ENOENT) {
+        XL_LOG(ctx, XL_LOG_ERROR, "The kernel doesn't support PCI device reset from sysfs");
+    } else {
+        XL_LOG_ERRNO(ctx, XL_LOG_ERROR, "Failed to access reset path %s", reset);
+    }
+    return -1;
+}