#define PCI_MSIX_FLAGS 2 /* Table at lower 11 bits */
#define PCI_MSIX_FLAGS_QSIZE 0x7FF
#define PCI_MSIX_FLAGS_ENABLE (1 << 15)
+#define PCI_MSIX_FLAGS_MASKALL (1 << 14)
#define PCI_MSIX_FLAGS_BIRMASK (7 << 0)
/* MSI-X capability structure */
#define MSIX_PBA_OFFSET 8
#define MSIX_CAP_LENGTH 12
-/* MSI enable bit is in byte 1 in FLAGS register */
-#define MSIX_ENABLE_OFFSET (PCI_MSIX_FLAGS + 1)
+/* MSI enable bit and maskall bit are in byte 1 in FLAGS register */
+#define MSIX_CONTROL_OFFSET (PCI_MSIX_FLAGS + 1)
#define MSIX_ENABLE_MASK (PCI_MSIX_FLAGS_ENABLE >> 8)
+#define MSIX_MASKALL_MASK (PCI_MSIX_FLAGS_MASKALL >> 8)
/* MSI-X table format */
#define MSIX_MSG_ADDR 0
#define MSIX_VECTOR_CTRL 12
#define MSIX_ENTRY_SIZE 16
#define MSIX_VECTOR_MASK 0x1
+
+/* 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
/* Flag for interrupt controller to declare MSI-X support */
int msix_supported;
-/* Reserve second half of the page for pending bits */
-static int msix_page_pending(PCIDevice *d)
-{
- return (d->msix_page_size / 2);
-}
-
/* 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.
/* Add space for MSI-X structures */
if (!bar_size) {
- new_size = pdev->msix_page_size;
- } else if (bar_size < pdev->msix_page_size) {
- bar_size = pdev->msix_page_size;
- new_size = pdev->msix_page_size * 2;
- } else
+ new_size = MSIX_PAGE_SIZE;
+ } else if (bar_size < MSIX_PAGE_SIZE) {
+ bar_size = MSIX_PAGE_SIZE;
+ new_size = MSIX_PAGE_SIZE * 2;
+ } else {
new_size = bar_size * 2;
+ }
pdev->msix_bar_size = new_size;
config_offset = pci_add_capability(pdev, PCI_CAP_ID_MSIX, MSIX_CAP_LENGTH);
/* Table on top of BAR */
pci_set_long(config + MSIX_TABLE_OFFSET, bar_size | bar_nr);
/* Pending bits on top of that */
- pci_set_long(config + MSIX_PBA_OFFSET, (bar_size + msix_page_pending(pdev))
- | bar_nr);
+ pci_set_long(config + MSIX_PBA_OFFSET, (bar_size + MSIX_PAGE_PENDING) |
+ bar_nr);
pdev->msix_cap = config_offset;
/* Make flags bit writeable. */
- pdev->wmask[config_offset + MSIX_ENABLE_OFFSET] |= MSIX_ENABLE_MASK;
+ pdev->wmask[config_offset + MSIX_CONTROL_OFFSET] |= MSIX_ENABLE_MASK |
+ MSIX_MASKALL_MASK;
return 0;
}
-static void msix_free_irq_entries(PCIDevice *dev)
-{
- int vector;
-
- for (vector = 0; vector < dev->msix_entries_nr; ++vector)
- dev->msix_entry_used[vector] = 0;
-}
-
-/* Handle MSI-X capability config write. */
-void msix_write_config(PCIDevice *dev, uint32_t addr,
- uint32_t val, int len)
-{
- unsigned enable_pos = dev->msix_cap + MSIX_ENABLE_OFFSET;
- if (addr + len <= enable_pos || addr > enable_pos)
- return;
-
- if (msix_enabled(dev))
- qemu_set_irq(dev->irq[0], 0);
-}
-
static uint32_t msix_mmio_readl(void *opaque, target_phys_addr_t addr)
{
PCIDevice *dev = opaque;
- unsigned int offset = addr & (dev->msix_page_size - 1);
+ unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3;
void *page = dev->msix_table_page;
- uint32_t val = 0;
-
- memcpy(&val, (void *)((char *)page + offset), 4);
- return val;
+ return pci_get_long(page + offset);
}
static uint32_t msix_mmio_read_unallowed(void *opaque, target_phys_addr_t addr)
static uint8_t *msix_pending_byte(PCIDevice *dev, int vector)
{
- return dev->msix_table_page + msix_page_pending(dev) + vector / 8;
+ return dev->msix_table_page + MSIX_PAGE_PENDING + vector / 8;
}
static int msix_is_pending(PCIDevice *dev, int vector)
*msix_pending_byte(dev, vector) &= ~msix_pending_mask(vector);
}
+static int msix_function_masked(PCIDevice *dev)
+{
+ return dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] & MSIX_MASKALL_MASK;
+}
+
static int msix_is_masked(PCIDevice *dev, int vector)
{
unsigned offset = vector * MSIX_ENTRY_SIZE + MSIX_VECTOR_CTRL;
- return dev->msix_table_page[offset] & MSIX_VECTOR_MASK;
+ return msix_function_masked(dev) ||
+ dev->msix_table_page[offset] & MSIX_VECTOR_MASK;
}
-static void msix_mmio_writel(void *opaque, target_phys_addr_t addr,
- uint32_t val)
+static void msix_handle_mask_update(PCIDevice *dev, int vector)
{
- PCIDevice *dev = opaque;
- unsigned int offset = addr & (dev->msix_page_size - 1);
- int vector = offset / MSIX_ENTRY_SIZE;
- memcpy(dev->msix_table_page + offset, &val, 4);
if (!msix_is_masked(dev, vector) && msix_is_pending(dev, vector)) {
msix_clr_pending(dev, vector);
msix_notify(dev, vector);
}
}
+/* Handle MSI-X capability config write. */
+void msix_write_config(PCIDevice *dev, uint32_t addr,
+ uint32_t val, int len)
+{
+ unsigned enable_pos = dev->msix_cap + MSIX_CONTROL_OFFSET;
+ int vector;
+
+ if (addr + len <= enable_pos || addr > enable_pos) {
+ return;
+ }
+
+ if (!msix_enabled(dev)) {
+ return;
+ }
+
+ qemu_set_irq(dev->irq[0], 0);
+
+ if (msix_function_masked(dev)) {
+ return;
+ }
+
+ for (vector = 0; vector < dev->msix_entries_nr; ++vector) {
+ msix_handle_mask_update(dev, vector);
+ }
+}
+
+static void msix_mmio_writel(void *opaque, target_phys_addr_t addr,
+ uint32_t val)
+{
+ PCIDevice *dev = opaque;
+ unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3;
+ int vector = offset / MSIX_ENTRY_SIZE;
+ pci_set_long(dev->msix_table_page + offset, val);
+ msix_handle_mask_update(dev, vector);
+}
+
static void msix_mmio_write_unallowed(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
/* Should be called from device's map method. */
void msix_mmio_map(PCIDevice *d, int region_num,
- uint32_t addr, uint32_t size, int type)
+ pcibus_t addr, pcibus_t size, int type)
{
uint8_t *config = d->config + d->msix_cap;
uint32_t table = pci_get_long(config + MSIX_TABLE_OFFSET);
- uint32_t offset = table & ~(d->msix_page_size - 1);
+ uint32_t offset = table & ~(MSIX_PAGE_SIZE - 1);
/* TODO: for assigned devices, we'll want to make it possible to map
* pending bits separately in case they are in a separate bar. */
int table_bir = table & PCI_MSIX_FLAGS_BIRMASK;
d->msix_mmio_index);
}
+static void msix_mask_all(struct PCIDevice *dev, unsigned nentries)
+{
+ int vector;
+ for (vector = 0; vector < nentries; ++vector) {
+ unsigned offset = vector * MSIX_ENTRY_SIZE + MSIX_VECTOR_CTRL;
+ dev->msix_table_page[offset] |= MSIX_VECTOR_MASK;
+ }
+}
+
/* Initialize the MSI-X structures. Note: if MSI-X is supported, BAR size is
* modified, it should be retrieved with msix_bar_size. */
int msix_init(struct PCIDevice *dev, unsigned short nentries,
- unsigned bar_nr, unsigned bar_size, target_phys_addr_t page_size)
+ unsigned bar_nr, unsigned bar_size)
{
int ret;
/* Nothing to do if MSI is not supported by interrupt controller */
dev->msix_entry_used = qemu_mallocz(MSIX_MAX_ENTRIES *
sizeof *dev->msix_entry_used);
- dev->msix_page_size = page_size;
- dev->msix_table_page = qemu_mallocz(dev->msix_page_size);
+ dev->msix_table_page = qemu_mallocz(MSIX_PAGE_SIZE);
+ msix_mask_all(dev, nentries);
dev->msix_mmio_index = cpu_register_io_memory(msix_mmio_read,
msix_mmio_write, dev);
return ret;
}
+static void msix_free_irq_entries(PCIDevice *dev)
+{
+ int vector;
+
+ for (vector = 0; vector < dev->msix_entries_nr; ++vector) {
+ dev->msix_entry_used[vector] = 0;
+ msix_clr_pending(dev, vector);
+ }
+}
+
/* Clean up resources for the device. */
int msix_uninit(PCIDevice *dev)
{
}
qemu_put_buffer(f, dev->msix_table_page, n * MSIX_ENTRY_SIZE);
- qemu_put_buffer(f, dev->msix_table_page + msix_page_pending(dev),
- (n + 7) / 8);
+ qemu_put_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
}
/* Should be called after restoring the config space. */
msix_free_irq_entries(dev);
qemu_get_buffer(f, dev->msix_table_page, n * MSIX_ENTRY_SIZE);
- qemu_get_buffer(f, dev->msix_table_page + msix_page_pending(dev),
- (n + 7) / 8);
+ qemu_get_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
}
/* Does device support MSI-X? */
int msix_enabled(PCIDevice *dev)
{
return (dev->cap_present & QEMU_PCI_CAP_MSIX) &&
- (dev->config[dev->msix_cap + MSIX_ENABLE_OFFSET] &
+ (dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &
MSIX_ENABLE_MASK);
}
if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
return;
msix_free_irq_entries(dev);
- dev->config[dev->msix_cap + MSIX_ENABLE_OFFSET] &= MSIX_ENABLE_MASK;
- memset(dev->msix_table_page, 0, dev->msix_page_size);
+ dev->config[dev->msix_cap + MSIX_CONTROL_OFFSET] &=
+ ~dev->wmask[dev->msix_cap + MSIX_CONTROL_OFFSET];
+ memset(dev->msix_table_page, 0, MSIX_PAGE_SIZE);
+ msix_mask_all(dev, dev->msix_entries_nr);
}
/* PCI spec suggests that devices make it possible for software to configure
/* Mark vector as unused. */
void msix_vector_unuse(PCIDevice *dev, unsigned vector)
{
- if (vector < dev->msix_entries_nr && dev->msix_entry_used[vector])
- --dev->msix_entry_used[vector];
+ if (vector >= dev->msix_entries_nr || !dev->msix_entry_used[vector]) {
+ return;
+ }
+ if (--dev->msix_entry_used[vector]) {
+ return;
+ }
+ msix_clr_pending(dev, vector);
+}
+
+void msix_unuse_all_vectors(PCIDevice *dev)
+{
+ if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
+ return;
+ msix_free_irq_entries(dev);
}
projects / qemu.git / blobdiff