[core] refactored to centralize the lookup and reset code

src/Makefile

@@ -1,2 +1,7 @@
-vendor-reset-y += src/vendor-reset.o src/ftrace.o src/hooks.o
-ccflags-y += -I$(src)/src
+vendor-reset-y += \
+	src/vendor-reset.o \
+	src/vendor-reset-dev.o\
+	src/ftrace.o \
+	src/hooks.o
+
+ccflags-y += -I$(src)/src

src/amd/vega20.c

@@ -62,7 +62,6 @@ static int vega20_baco_set_state(struct amd_fake_dev *adev, enum BACO_STATE stat
   uint32_t data;
 
   vega20_baco_get_state(adev, &cur_state);
-
   if (cur_state == state)
     return 0;
 

src/hooks.c

@@ -20,7 +20,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include "vendor-reset-dev.h"
-#include "device-db.h"
 #include "ftrace.h"
 #include "hooks.h"
 
@@ -30,38 +29,19 @@ static int hooked_pci_dev_specific_reset(struct pci_dev *dev, int probe)
 {
   int ret;
   struct vendor_reset_cfg *cfg;
-  struct vendor_reset_dev vdev = {0};
 
   ret = orig_pci_dev_specific_reset(dev, probe);
   if (!ret || ret != -ENOTTY)
     return ret;
 
-  for (cfg = vendor_reset_devices; cfg->vendor; ++cfg)
-    if ((cfg->vendor == dev->vendor || cfg->vendor == PCI_ANY_ID) && (cfg->device == dev->device || cfg->device == PCI_ANY_ID))
-      break;
+  cfg = vendor_reset_cfg_find(dev->vendor, dev->device);
+  if (!cfg)
+    return -ENOTTY;
 
-  if (cfg->vendor)
-  {
-    vdev.pdev = dev;
-    vdev.info = cfg->info;
-
-    if (cfg->ops->pre_reset && (ret = cfg->ops->pre_reset(&vdev)) && ret)
-      return ret;
-
-    ret = vdev.reset_ret = cfg->ops->reset(&vdev);
-    if (ret)
-      pr_warn("failed to reset device: %d\n", ret);
-
-    if (cfg->ops->post_reset)
-      ret = cfg->ops->post_reset(&vdev);
-
-    return ret;
-  }
-
-  return -ENOTTY;
+  return vendor_reset_dev_locked(cfg, dev);
 }
 
 struct ftrace_hook fh_hooks[] = {
     HOOK("pci_dev_specific_reset", &orig_pci_dev_specific_reset, hooked_pci_dev_specific_reset),
     {0},
-};
+};

src/vendor-reset-dev.c

@@ -0,0 +1,71 @@
+/*
+Vendor Reset - Vendor Specific Reset
+Copyright (C) 2020 Geoffrey McRae <geoff@hostfission.com>
+Copyright (C) 2020 Adam Madsen <adam@ajmadsen.com>
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "vendor-reset-dev.h"
+#include "device-db.h"
+
+struct vendor_reset_cfg * vendor_reset_cfg_find(unsigned int vendor, unsigned
+  int device)
+{
+  struct vendor_reset_cfg * cfg;
+
+  for(cfg = vendor_reset_devices; cfg->vendor; ++cfg)
+  {
+    if (cfg->vendor != vendor)
+      continue;
+
+    if (device == PCI_ANY_ID || device == cfg->device)
+      break;
+  }
+
+  if (!cfg->vendor)
+    return NULL;
+
+  return cfg;
+}
+
+long vendor_reset_dev_locked(struct vendor_reset_cfg *cfg, struct pci_dev *dev)
+{
+  struct vendor_reset_dev vdev =
+  {
+    .pdev = dev,
+    .info = cfg->info
+  };
+  int ret;
+
+  if (cfg->ops->pre_reset)
+  {
+    ret = cfg->ops->pre_reset(&vdev);
+    if (ret)
+      return ret;
+  }
+
+  /* expose return code to cleanup */
+  ret = vdev.reset_ret = cfg->ops->reset(&vdev);
+  if (ret)
+  {
+    pci_warn(dev, "Failed to reset device\n");
+    return ret;
+  }
+
+  if (cfg->ops->post_reset)
+    ret = cfg->ops->post_reset(&vdev);
+
+  return ret;
+}

src/vendor-reset-dev.h

@@ -20,8 +20,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #ifndef _H_VENDOR_RESET_DEV
 #define _H_VENDOR_RESET_DEV
 
-#define VENDOR_RESET_DEVICE_ALL ((unsigned int)-1)
-
 #include <linux/pci.h>
 
 struct vendor_reset_dev
@@ -49,8 +47,7 @@ struct vendor_reset_cfg
   /* the vendor ID */
   unsigned int vendor;
 
-  /* the device ID or VENDOR_RESET_DEVICE_ALL to match all devices for the
-   * vendor */
+  /* the device ID or PCI_ANY_ID to match all devices for the vendor */
   unsigned int device;
 
   /* the reset operations */
@@ -60,4 +57,11 @@ struct vendor_reset_cfg
   unsigned long info;
 };
 
+/* search the device table for the specified vendor and device id and return it */
+struct vendor_reset_cfg * vendor_reset_cfg_find(unsigned int vendor, unsigned
+  int device);
+
+/* perform the device reset */
+long vendor_reset_dev_locked(struct vendor_reset_cfg *cfg, struct pci_dev *dev);
+
 #endif

src/vendor-reset.c

@@ -24,9 +24,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <linux/pci.h>
 
 #include "vendor-reset-dev.h"
-#include "vendor-reset.h"
-
-#include "device-db.h"
+#include "vendor-reset-ioctl.h"
 
 #include "ftrace.h"
 #include "hooks.h"
@@ -41,10 +39,9 @@ module_param(install_hook, bool, 0);
 static long vendor_reset_ioctl_reset(struct file * filp, unsigned long arg)
 {
   struct vendor_reset_ioctl dev;
-  struct vendor_reset_cfg *entry = vendor_reset_devices;
+  struct vendor_reset_cfg *cfg;
   struct pci_dev * pcidev;
   int ret;
-  struct vendor_reset_dev vdev = {0};
 
   if (copy_from_user(&dev, (void __user *)arg, sizeof(dev)))
     return -EFAULT;
@@ -53,25 +50,13 @@ static long vendor_reset_ioctl_reset(struct file * filp, unsigned long arg)
   if (!pcidev)
     return -ENODEV;
 
-  for(entry = vendor_reset_devices; entry->vendor; ++entry)
-  {
-    if (entry->vendor != pcidev->vendor)
-      continue;
-
-    if (entry->device == VENDOR_RESET_DEVICE_ALL ||
-        entry->device == pcidev->device)
-      break;
-  }
-
-  if (!entry->vendor)
+  cfg = vendor_reset_cfg_find(pcidev->vendor, pcidev->device);
+  if (!cfg)
   {
     ret = -EOPNOTSUPP;
     goto err;
   }
 
-  vdev.pdev = pcidev;
-  vdev.info = entry->info;
-
   /* we probably always want to lock the device */
   if (!pci_cfg_access_trylock(pcidev))
   {
@@ -79,36 +64,19 @@ static long vendor_reset_ioctl_reset(struct file * filp, unsigned long arg)
     ret = -EAGAIN;
     goto err;
   }
-  else
+
+  if (!device_trylock(&pcidev->dev))
   {
-    if (!device_trylock(&pcidev->dev))
-    {
-      pci_warn(pcidev, "Could not acquire device lock\n");
-      pci_cfg_access_unlock(pcidev);
-      ret = -EAGAIN;
-      goto err;
-    }
+    pci_warn(pcidev, "Could not acquire device lock\n");
+    ret = -EAGAIN;
+    goto unlock;
   }
 
-  if (entry->ops->pre_reset)
-  {
-    ret = entry->ops->pre_reset(&vdev);
-    if (ret)
-      goto unlock;
-  }
-
-  /* expose return code to cleanup */
-  ret = vdev.reset_ret = entry->ops->reset(&vdev);
-  if (ret)
-    pci_warn(pcidev, "Failed to reset device\n");
-
-  if (entry->ops->post_reset)
-    ret = entry->ops->post_reset(&vdev);
+  ret = vendor_reset_dev_locked(cfg, pcidev);
+  device_unlock(&pcidev->dev);
 
 unlock:
-  device_unlock(&pcidev->dev);
   pci_cfg_access_unlock(pcidev);
-
 err:
   pci_dev_put(pcidev);
   return ret;

userspace/vendor-reset.c

@@ -22,7 +22,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
-#include "vendor-reset.h"
+#include "vendor-reset-ioctl.h"
 #include "ucommon.h"
 
 void help_(const char *prog);