[Qemu-devel] [PATCH 4/8] pci: Replace used bitmap with capability byte map

[Alex Williamson <alex.williamson@redhat.com>]

Capabilities are allocated in bytes, so we can track both whether
a byte is used and by what capability in the same structure.

Remove pci_reserve_capability() as there are no users.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 hw/pci.c |   16 +++++-----------
 hw/pci.h |    6 ++----
 2 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 6b2b320..e1e8a77 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -730,7 +730,7 @@ static void pci_config_alloc(PCIDevice *pci_dev)
     pci_dev->config = qemu_mallocz(config_size);
     pci_dev->cmask = qemu_mallocz(config_size);
     pci_dev->wmask = qemu_mallocz(config_size);
-    pci_dev->used = qemu_mallocz(config_size);
+    pci_dev->cap_map = qemu_mallocz(config_size);
 }
 
 static void pci_config_free(PCIDevice *pci_dev)
@@ -738,7 +738,7 @@ static void pci_config_free(PCIDevice *pci_dev)
     qemu_free(pci_dev->config);
     qemu_free(pci_dev->cmask);
     qemu_free(pci_dev->wmask);
-    qemu_free(pci_dev->used);
+    qemu_free(pci_dev->cap_map);
 }
 
 /* -1 for devfn means auto assign */
@@ -1928,7 +1928,7 @@ static int pci_find_space(PCIDevice *pdev, uint8_t size)
     int offset = PCI_CONFIG_HEADER_SIZE;
     int i;
     for (i = PCI_CONFIG_HEADER_SIZE; i < config_size; ++i)
-        if (pdev->used[i])
+        if (pdev->cap_map[i])
             offset = i + 1;
         else if (i - offset + 1 == size)
             return offset;
@@ -2033,7 +2033,7 @@ int pci_add_capability_at_offset(PCIDevice *pdev, uint8_t cap_id,
     config[PCI_CAP_LIST_ID] = cap_id;
     config[PCI_CAP_LIST_NEXT] = pdev->config[PCI_CAPABILITY_LIST];
     pdev->config[PCI_CAPABILITY_LIST] = offset;
-    memset(pdev->used + offset, 0xFF, size);
+    memset(pdev->cap_map + offset, cap_id, size);
     /* Make capability read-only by default */
     memset(pdev->wmask + offset, 0, size);
     /* Check capability by default */
@@ -2068,7 +2068,7 @@ void pci_del_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
     memset(pdev->wmask + offset, 0xff, size);
     /* Clear cmask as device-specific registers can't be checked */
     memset(pdev->cmask + offset, 0, size);
-    memset(pdev->used + offset, 0, size);
+    memset(pdev->cap_map + offset, 0, size);
 
     if (!pdev->config[PCI_CAPABILITY_LIST]) {
         pdev->config[PCI_STATUS] &= ~PCI_STATUS_CAP_LIST;
@@ -2076,12 +2076,6 @@ void pci_del_capability(PCIDevice *pdev, uint8_t cap_id, uint8_t size)
     }
 }
 
-/* Reserve space for capability at a known offset (to call after load). */
-void pci_reserve_capability(PCIDevice *pdev, uint8_t offset, uint8_t size)
-{
-    memset(pdev->used + offset, 0xff, size);
-}
-
 uint8_t pci_find_capability(PCIDevice *pdev, uint8_t cap_id)
 {
     return pci_find_capability_list(pdev, cap_id, NULL);
diff --git a/hw/pci.h b/hw/pci.h
index 0712e55..2265c70 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -151,8 +151,8 @@ struct PCIDevice {
     /* Used to implement R/W bytes */
     uint8_t *wmask;
 
-    /* Used to allocate config space for capabilities. */
-    uint8_t *used;
+    /* Used to allocate config space and track capabilities. */
+    uint8_t *cap_map;
 
     /* the following fields are read only */
     PCIBus *bus;
@@ -239,8 +239,6 @@ int pci_add_capability_at_offset(PCIDevice *pci_dev, uint8_t cap_id,
 
 void pci_del_capability(PCIDevice *pci_dev, uint8_t cap_id, uint8_t cap_size);
 
-void pci_reserve_capability(PCIDevice *pci_dev, uint8_t offset, uint8_t size);
-
 uint8_t pci_find_capability(PCIDevice *pci_dev, uint8_t cap_id);
 
 uint32_t pci_default_read_config(PCIDevice *d,