[PATCH v4 11/15] hw/nvme: Calculate BAR attributes in a function

[Lukasz Maniak <lukasz.maniak@linux.intel.com>]

From: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>

An NVMe device with SR-IOV capability calculates the BAR size
differently for PF and VF, so it makes sense to extract the common code
to a separate function.

Signed-off-by: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>
---
 hw/nvme/ctrl.c | 45 +++++++++++++++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 40eb6bd1a8..e101cb7d7c 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -6431,6 +6431,34 @@ static void nvme_init_pmr(NvmeCtrl *n, PCIDevice *pci_dev)
     memory_region_set_enabled(&n->pmr.dev->mr, false);
 }
 
+static uint64_t nvme_bar_size(unsigned total_queues, unsigned total_irqs,
+                              unsigned *msix_table_offset,
+                              unsigned *msix_pba_offset)
+{
+    uint64_t bar_size, msix_table_size, msix_pba_size;
+
+    bar_size = sizeof(NvmeBar) + 2 * total_queues * NVME_DB_SIZE;
+    bar_size = QEMU_ALIGN_UP(bar_size, 4 * KiB);
+
+    if (msix_table_offset) {
+        *msix_table_offset = bar_size;
+    }
+
+    msix_table_size = PCI_MSIX_ENTRY_SIZE * total_irqs;
+    bar_size += msix_table_size;
+    bar_size = QEMU_ALIGN_UP(bar_size, 4 * KiB);
+
+    if (msix_pba_offset) {
+        *msix_pba_offset = bar_size;
+    }
+
+    msix_pba_size = QEMU_ALIGN_UP(total_irqs, 64) / 8;
+    bar_size += msix_pba_size;
+
+    bar_size = pow2ceil(bar_size);
+    return bar_size;
+}
+
 static void nvme_init_sriov(NvmeCtrl *n, PCIDevice *pci_dev, uint16_t offset,
                             uint64_t bar_size)
 {
@@ -6470,7 +6498,7 @@ static int nvme_add_pm_capability(PCIDevice *pci_dev, uint8_t offset)
 static int nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
 {
     uint8_t *pci_conf = pci_dev->config;
-    uint64_t bar_size, msix_table_size, msix_pba_size;
+    uint64_t bar_size;
     unsigned msix_table_offset, msix_pba_offset;
     int ret;
 
@@ -6496,19 +6524,8 @@ static int nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
     }
 
     /* add one to max_ioqpairs to account for the admin queue pair */
-    bar_size = sizeof(NvmeBar) +
-               2 * (n->params.max_ioqpairs + 1) * NVME_DB_SIZE;
-    bar_size = QEMU_ALIGN_UP(bar_size, 4 * KiB);
-    msix_table_offset = bar_size;
-    msix_table_size = PCI_MSIX_ENTRY_SIZE * n->params.msix_qsize;
-
-    bar_size += msix_table_size;
-    bar_size = QEMU_ALIGN_UP(bar_size, 4 * KiB);
-    msix_pba_offset = bar_size;
-    msix_pba_size = QEMU_ALIGN_UP(n->params.msix_qsize, 64) / 8;
-
-    bar_size += msix_pba_size;
-    bar_size = pow2ceil(bar_size);
+    bar_size = nvme_bar_size(n->params.max_ioqpairs + 1, n->params.msix_qsize,
+                             &msix_table_offset, &msix_pba_offset);
 
     memory_region_init(&n->bar0, OBJECT(n), "nvme-bar0", bar_size);
     memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n, "nvme",
-- 
2.25.1