#define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8)
#define MSIX_MASKALL_MASK (PCI_MSIX_FLAGS_MASKALL >> 8)
-/* How much space does an MSIX table need. */
-/* The spec requires giving the table structure
- * a 4K aligned region all by itself. */
-#define MSIX_PAGE_SIZE 0x1000
-/* Reserve second half of the page for pending bits */
-#define MSIX_PAGE_PENDING (MSIX_PAGE_SIZE / 2)
-#define MSIX_MAX_ENTRIES 32
-
static MSIMessage msix_get_message(PCIDevice *dev, unsigned vector)
{
uint8_t *table_entry = dev->msix_table + vector * PCI_MSIX_ENTRY_SIZE;
return msg;
}
-/* Add MSI-X capability to the config space for the device. */
-/* Given a bar and its size, add MSI-X table on top of it
- * and fill MSI-X capability in the config space.
- * Original bar size must be a power of 2 or 0.
- * New bar size is returned. */
-static int msix_add_config(struct PCIDevice *pdev, unsigned short nentries,
- unsigned bar_nr, unsigned bar_size)
-{
- int config_offset;
- uint8_t *config;
-
- if (nentries < 1 || nentries > PCI_MSIX_FLAGS_QSIZE + 1)
- return -EINVAL;
- if (bar_size > 0x80000000)
- return -ENOSPC;
-
- /* Require aligned offset for MSI-X structures */
- if (bar_size & ~(MSIX_PAGE_SIZE - 1)) {
- return -EINVAL;
- }
-
- config_offset = pci_add_capability(pdev, PCI_CAP_ID_MSIX,
- 0, MSIX_CAP_LENGTH);
- if (config_offset < 0)
- return config_offset;
- config = pdev->config + config_offset;
-
- pci_set_word(config + PCI_MSIX_FLAGS, nentries - 1);
- /* Table on top of BAR */
- pci_set_long(config + PCI_MSIX_TABLE, bar_size | bar_nr);
- /* Pending bits on top of that */
- pci_set_long(config + PCI_MSIX_PBA, (bar_size + MSIX_PAGE_PENDING) |
- bar_nr);
- pdev->msix_cap = config_offset;
- /* Make flags bit writable. */
- pdev->wmask[config_offset + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK |
- MSIX_MASKALL_MASK;
- pdev->msix_function_masked = true;
- return 0;
-}
-
static uint8_t msix_pending_mask(int vector)
{
return 1 << (vector % 8);
},
};
-static void msix_mmio_setup(PCIDevice *d, MemoryRegion *bar)
-{
- uint8_t *config = d->config + d->msix_cap;
- uint32_t table = pci_get_long(config + PCI_MSIX_TABLE);
- uint32_t table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
- uint32_t pba = pci_get_long(config + PCI_MSIX_PBA);
- uint32_t pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
- /* TODO: for assigned devices, we'll want to make it possible to map
- * pending bits separately in case they are in a separate bar. */
-
- memory_region_add_subregion(bar, table_offset, &d->msix_table_mmio);
- memory_region_add_subregion(bar, pba_offset, &d->msix_pba_mmio);
-}
-
static void msix_mask_all(struct PCIDevice *dev, unsigned nentries)
{
int vector;
}
}
-/* Initialize the MSI-X structures. Note: if MSI-X is supported, BAR size is
- * modified, it should be retrieved with msix_bar_size. */
+/* Initialize the MSI-X structures */
int msix_init(struct PCIDevice *dev, unsigned short nentries,
- MemoryRegion *bar,
- unsigned bar_nr, unsigned bar_size)
+ MemoryRegion *table_bar, uint8_t table_bar_nr,
+ unsigned table_offset, MemoryRegion *pba_bar,
+ uint8_t pba_bar_nr, unsigned pba_offset, uint8_t cap_pos)
{
- int ret;
+ int cap;
unsigned table_size, pba_size;
+ uint8_t *config;
/* Nothing to do if MSI is not supported by interrupt controller */
if (!msi_supported) {
return -ENOTSUP;
}
- if (nentries > MSIX_MAX_ENTRIES)
+
+ if (nentries < 1 || nentries > PCI_MSIX_FLAGS_QSIZE + 1) {
return -EINVAL;
+ }
table_size = nentries * PCI_MSIX_ENTRY_SIZE;
pba_size = QEMU_ALIGN_UP(nentries, 64) / 8;
- dev->msix_entry_used = g_malloc0(MSIX_MAX_ENTRIES *
- sizeof *dev->msix_entry_used);
+ /* Sanity test: table & pba don't overlap, fit within BARs, min aligned */
+ if ((table_bar_nr == pba_bar_nr &&
+ ranges_overlap(table_offset, table_size, pba_offset, pba_size)) ||
+ table_offset + table_size > memory_region_size(table_bar) ||
+ pba_offset + pba_size > memory_region_size(pba_bar) ||
+ (table_offset | pba_offset) & PCI_MSIX_FLAGS_BIRMASK) {
+ return -EINVAL;
+ }
+
+ cap = pci_add_capability(dev, PCI_CAP_ID_MSIX, cap_pos, MSIX_CAP_LENGTH);
+ if (cap < 0) {
+ return cap;
+ }
+
+ dev->msix_cap = cap;
+ dev->cap_present |= QEMU_PCI_CAP_MSIX;
+ config = dev->config + cap;
+
+ pci_set_word(config + PCI_MSIX_FLAGS, nentries - 1);
+ dev->msix_entries_nr = nentries;
+ dev->msix_function_masked = true;
+
+ pci_set_long(config + PCI_MSIX_TABLE, table_offset | table_bar_nr);
+ pci_set_long(config + PCI_MSIX_PBA, pba_offset | pba_bar_nr);
+
+ /* Make flags bit writable. */
+ dev->wmask[cap + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK |
+ MSIX_MASKALL_MASK;
dev->msix_table = g_malloc0(table_size);
dev->msix_pba = g_malloc0(pba_size);
+ dev->msix_entry_used = g_malloc0(nentries * sizeof *dev->msix_entry_used);
+
msix_mask_all(dev, nentries);
memory_region_init_io(&dev->msix_table_mmio, &msix_table_mmio_ops, dev,
"msix-table", table_size);
+ memory_region_add_subregion(table_bar, table_offset, &dev->msix_table_mmio);
memory_region_init_io(&dev->msix_pba_mmio, &msix_pba_mmio_ops, dev,
"msix-pba", pba_size);
+ memory_region_add_subregion(pba_bar, pba_offset, &dev->msix_pba_mmio);
- dev->msix_entries_nr = nentries;
- ret = msix_add_config(dev, nentries, bar_nr, bar_size);
- if (ret)
- goto err_config;
-
- dev->cap_present |= QEMU_PCI_CAP_MSIX;
- msix_mmio_setup(dev, bar);
return 0;
-
-err_config:
- dev->msix_entries_nr = 0;
- memory_region_destroy(&dev->msix_pba_mmio);
- g_free(dev->msix_pba);
- dev->msix_pba = NULL;
- memory_region_destroy(&dev->msix_table_mmio);
- g_free(dev->msix_table);
- dev->msix_table = NULL;
- g_free(dev->msix_entry_used);
- dev->msix_entry_used = NULL;
- return ret;
}
int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries,
* the upper half. Do not use these elsewhere!
*/
#define MSIX_EXCLUSIVE_BAR_SIZE 4096
+#define MSIX_EXCLUSIVE_BAR_TABLE_OFFSET 0
#define MSIX_EXCLUSIVE_BAR_PBA_OFFSET (MSIX_EXCLUSIVE_BAR_SIZE / 2)
+#define MSIX_EXCLUSIVE_CAP_OFFSET 0
if (nentries * PCI_MSIX_ENTRY_SIZE > MSIX_EXCLUSIVE_BAR_PBA_OFFSET) {
return -EINVAL;
free(name);
ret = msix_init(dev, nentries, &dev->msix_exclusive_bar, bar_nr,
- MSIX_EXCLUSIVE_BAR_SIZE);
+ MSIX_EXCLUSIVE_BAR_TABLE_OFFSET, &dev->msix_exclusive_bar,
+ bar_nr, MSIX_EXCLUSIVE_BAR_PBA_OFFSET,
+ MSIX_EXCLUSIVE_CAP_OFFSET);
if (ret) {
memory_region_destroy(&dev->msix_exclusive_bar);
return ret;
}
/* Clean up resources for the device. */
-int msix_uninit(PCIDevice *dev, MemoryRegion *bar)
+int msix_uninit(PCIDevice *dev, MemoryRegion *table_bar, MemoryRegion *pba_bar)
{
if (!msix_present(dev)) {
return 0;
dev->msix_cap = 0;
msix_free_irq_entries(dev);
dev->msix_entries_nr = 0;
- memory_region_del_subregion(bar, &dev->msix_pba_mmio);
+ memory_region_del_subregion(pba_bar, &dev->msix_pba_mmio);
memory_region_destroy(&dev->msix_pba_mmio);
g_free(dev->msix_pba);
dev->msix_pba = NULL;
- memory_region_del_subregion(bar, &dev->msix_table_mmio);
+ memory_region_del_subregion(table_bar, &dev->msix_table_mmio);
memory_region_destroy(&dev->msix_table_mmio);
g_free(dev->msix_table);
dev->msix_table = NULL;
void msix_uninit_exclusive_bar(PCIDevice *dev)
{
if (msix_present(dev)) {
- msix_uninit(dev, &dev->msix_exclusive_bar);
+ msix_uninit(dev, &dev->msix_exclusive_bar, &dev->msix_exclusive_bar);
memory_region_destroy(&dev->msix_exclusive_bar);
}
}
projects / sdk / emulator / qemu.git / commitdiff