#include "hw.h"
#include "msix.h"
#include "pci.h"
+#include "range.h"
-/* Declaration from linux/pci_regs.h */
-#define PCI_CAP_ID_MSIX 0x11 /* MSI-X */
-#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_BIRMASK (7 << 0)
-
-/* MSI-X capability structure */
-#define MSIX_TABLE_OFFSET 4
-#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)
-
-/* MSI-X table format */
-#define MSIX_MSG_ADDR 0
-#define MSIX_MSG_UPPER_ADDR 4
-#define MSIX_MSG_DATA 8
-#define MSIX_VECTOR_CTRL 12
-#define MSIX_ENTRY_SIZE 16
-#define MSIX_VECTOR_MASK 0x1
+#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. Align it to
- * target pages so that drivers can do passthrough
- * on the rest of the region. */
-#define MSIX_PAGE_SIZE TARGET_PAGE_ALIGN(0x1000)
+ * 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
-#ifdef MSIX_DEBUG
-#define DEBUG(fmt, ...) \
- do { \
- fprintf(stderr, "%s: " fmt, __func__ , __VA_ARGS__); \
- } while (0)
-#else
-#define DEBUG(fmt, ...) do { } while(0)
-#endif
-
/* Flag for interrupt controller to declare MSI-X support */
int msix_supported;
return -ENOSPC;
/* Add space for MSI-X structures */
- if (!bar_size)
+ if (!bar_size) {
new_size = MSIX_PAGE_SIZE;
- else if (bar_size < MSIX_PAGE_SIZE) {
+ } else if (bar_size < MSIX_PAGE_SIZE) {
bar_size = MSIX_PAGE_SIZE;
new_size = MSIX_PAGE_SIZE * 2;
- } else
+ } 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);
+ 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 + MSIX_TABLE_OFFSET, bar_size | bar_nr);
+ pci_set_long(config + PCI_MSIX_TABLE, bar_size | bar_nr);
/* Pending bits on top of that */
- pci_set_long(config + MSIX_PBA_OFFSET, (bar_size + MSIX_PAGE_PENDING) |
+ pci_set_long(config + PCI_MSIX_PBA, (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;
+ /* Make flags bit writable. */
+ 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)
+static uint64_t msix_mmio_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
{
PCIDevice *dev = opaque;
- unsigned int offset = addr & (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;
-}
-
-static uint32_t msix_mmio_read_unallowed(void *opaque, target_phys_addr_t addr)
-{
- fprintf(stderr, "MSI-X: only dword read is allowed!\n");
- return 0;
+ return pci_get_long(page + offset);
}
static uint8_t msix_pending_mask(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;
+ unsigned offset =
+ vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL;
+ return msix_function_masked(dev) ||
+ dev->msix_table_page[offset] & PCI_MSIX_ENTRY_CTRL_MASKBIT;
}
-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 & (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);
}
}
-static void msix_mmio_write_unallowed(void *opaque, target_phys_addr_t addr,
- uint32_t val)
+/* Handle MSI-X capability config write. */
+void msix_write_config(PCIDevice *dev, uint32_t addr,
+ uint32_t val, int len)
{
- fprintf(stderr, "MSI-X: only dword write is allowed!\n");
+ unsigned enable_pos = dev->msix_cap + MSIX_CONTROL_OFFSET;
+ int vector;
+
+ if (!range_covers_byte(addr, len, enable_pos)) {
+ return;
+ }
+
+ if (!msix_enabled(dev)) {
+ return;
+ }
+
+ pci_device_deassert_intx(dev);
+
+ if (msix_function_masked(dev)) {
+ return;
+ }
+
+ for (vector = 0; vector < dev->msix_entries_nr; ++vector) {
+ msix_handle_mask_update(dev, vector);
+ }
}
-static CPUWriteMemoryFunc * const msix_mmio_write[] = {
- msix_mmio_write_unallowed, msix_mmio_write_unallowed, msix_mmio_writel
-};
+static void msix_mmio_write(void *opaque, target_phys_addr_t addr,
+ uint64_t val, unsigned size)
+{
+ PCIDevice *dev = opaque;
+ unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x3;
+ int vector = offset / PCI_MSIX_ENTRY_SIZE;
+ pci_set_long(dev->msix_table_page + offset, val);
+ msix_handle_mask_update(dev, vector);
+}
-static CPUReadMemoryFunc * const msix_mmio_read[] = {
- msix_mmio_read_unallowed, msix_mmio_read_unallowed, msix_mmio_readl
+static const MemoryRegionOps msix_mmio_ops = {
+ .read = msix_mmio_read,
+ .write = msix_mmio_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
};
-/* 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)
+static void msix_mmio_setup(PCIDevice *d, MemoryRegion *bar)
{
uint8_t *config = d->config + d->msix_cap;
- uint32_t table = pci_get_long(config + MSIX_TABLE_OFFSET);
+ uint32_t table = pci_get_long(config + PCI_MSIX_TABLE);
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;
- if (table_bir != region_num)
- return;
- if (size <= offset)
- return;
- cpu_register_physical_memory(addr + offset, size - offset,
- d->msix_mmio_index);
+ memory_region_add_subregion(bar, offset, &d->msix_mmio);
+}
+
+static void msix_mask_all(struct PCIDevice *dev, unsigned nentries)
+{
+ int vector;
+ for (vector = 0; vector < nentries; ++vector) {
+ unsigned offset =
+ vector * PCI_MSIX_ENTRY_SIZE + PCI_MSIX_ENTRY_VECTOR_CTRL;
+ dev->msix_table_page[offset] |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
+ }
}
/* 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,
+ MemoryRegion *bar,
unsigned bar_nr, unsigned bar_size)
{
int ret;
if (nentries > MSIX_MAX_ENTRIES)
return -EINVAL;
- dev->msix_entry_used = qemu_mallocz(MSIX_MAX_ENTRIES *
+ dev->msix_entry_used = g_malloc0(MSIX_MAX_ENTRIES *
sizeof *dev->msix_entry_used);
- dev->msix_table_page = qemu_mallocz(MSIX_PAGE_SIZE);
+ dev->msix_table_page = g_malloc0(MSIX_PAGE_SIZE);
+ msix_mask_all(dev, nentries);
- dev->msix_mmio_index = cpu_register_io_memory(msix_mmio_read,
- msix_mmio_write, dev);
- if (dev->msix_mmio_index == -1) {
- ret = -EBUSY;
- goto err_index;
- }
+ memory_region_init_io(&dev->msix_mmio, &msix_mmio_ops, dev,
+ "msix", MSIX_PAGE_SIZE);
dev->msix_entries_nr = nentries;
ret = msix_add_config(dev, nentries, bar_nr, bar_size);
goto err_config;
dev->cap_present |= QEMU_PCI_CAP_MSIX;
+ msix_mmio_setup(dev, bar);
return 0;
err_config:
dev->msix_entries_nr = 0;
- cpu_unregister_io_memory(dev->msix_mmio_index);
-err_index:
- qemu_free(dev->msix_table_page);
+ memory_region_destroy(&dev->msix_mmio);
+ g_free(dev->msix_table_page);
dev->msix_table_page = NULL;
- qemu_free(dev->msix_entry_used);
+ g_free(dev->msix_entry_used);
dev->msix_entry_used = NULL;
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)
+int msix_uninit(PCIDevice *dev, MemoryRegion *bar)
{
if (!(dev->cap_present & QEMU_PCI_CAP_MSIX))
return 0;
dev->msix_cap = 0;
msix_free_irq_entries(dev);
dev->msix_entries_nr = 0;
- cpu_unregister_io_memory(dev->msix_mmio_index);
- qemu_free(dev->msix_table_page);
+ memory_region_del_subregion(bar, &dev->msix_mmio);
+ memory_region_destroy(&dev->msix_mmio);
+ g_free(dev->msix_table_page);
dev->msix_table_page = NULL;
- qemu_free(dev->msix_entry_used);
+ g_free(dev->msix_entry_used);
dev->msix_entry_used = NULL;
dev->cap_present &= ~QEMU_PCI_CAP_MSIX;
return 0;
return;
}
- qemu_put_buffer(f, dev->msix_table_page, n * MSIX_ENTRY_SIZE);
+ qemu_put_buffer(f, dev->msix_table_page, n * PCI_MSIX_ENTRY_SIZE);
qemu_put_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
}
}
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, n * PCI_MSIX_ENTRY_SIZE);
qemu_get_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
}
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);
}
/* Send an MSI-X message */
void msix_notify(PCIDevice *dev, unsigned vector)
{
- uint8_t *table_entry = dev->msix_table_page + vector * MSIX_ENTRY_SIZE;
+ uint8_t *table_entry = dev->msix_table_page + vector * PCI_MSIX_ENTRY_SIZE;
uint64_t address;
uint32_t data;
return;
}
- address = pci_get_long(table_entry + MSIX_MSG_UPPER_ADDR);
- address = (address << 32) | pci_get_long(table_entry + MSIX_MSG_ADDR);
- data = pci_get_long(table_entry + MSIX_MSG_DATA);
- stl_phys(address, data);
+ address = pci_get_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR);
+ data = pci_get_long(table_entry + PCI_MSIX_ENTRY_DATA);
+ stl_le_phys(address, data);
}
void msix_reset(PCIDevice *dev)
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;
+ 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);
}
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