MSIx support is added in the RISC-V IOMMU platform device by including
the required MSIx facilities to alow software to properly setup the MSIx
subsystem.
We took inspiration of what is being done in the riscv-iommu-pci device,
mainly msix_init() and msix_notify(), while keeping in mind that
riscv-iommu-sys isn't a true PCI device and we don't need to copy/paste
all the contents of these MSIx functions.
Two extra MSI MemoryRegions were added: 'msix-table' and 'msix-pba'.
They are used to manage r/w of the MSI table and Pending Bit Array (PBA)
respectively. Both are subregions of the main IOMMU memory region,
iommu->regs_mr, initialized during riscv_iommu_realize(), and each one
has their own handlers for MSIx reads and writes.
This is the expected memory map when using this device in the 'virt'
machine:
0000000003010000-0000000003010fff (prio 0, i/o): riscv-iommu-regs
0000000003010300-000000000301034f (prio 0, i/o): msix-table
0000000003010400-0000000003010407 (prio 0, i/o): msix-pba
We're now able to set IGS to RISCV_IOMMU_CAP_IGS_BOTH, and userspace is
free to decide which interrupt model to use.
Enabling MSIx support for this device in the 'virt' machine requires
adding 'msi-parent' in the iommu-sys DT.
Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
---
hw/riscv/riscv-iommu-sys.c | 116 +++++++++++++++++++++++++++++++++++--
hw/riscv/trace-events | 2 +
hw/riscv/virt.c | 6 +-
3 files changed, 119 insertions(+), 5 deletions(-)
diff --git a/hw/riscv/riscv-iommu-sys.c b/hw/riscv/riscv-iommu-sys.c
index 4b82046ce9..a0ef67a20b 100644
--- a/hw/riscv/riscv-iommu-sys.c
+++ b/hw/riscv/riscv-iommu-sys.c
@@ -26,11 +26,15 @@
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "qom/object.h"
+#include "exec/exec-all.h"
+#include "trace.h"
#include "riscv-iommu.h"
#define RISCV_IOMMU_SYSDEV_ICVEC_VECTORS 0x3333
+#define RISCV_IOMMU_PCI_MSIX_VECTORS 5
+
/* RISC-V IOMMU System Platform Device Emulation */
struct RISCVIOMMUStateSys {
@@ -39,21 +43,123 @@ struct RISCVIOMMUStateSys {
uint32_t base_irq;
DeviceState *irqchip;
RISCVIOMMUState iommu;
+
+ /* Wired int support */
qemu_irq irqs[RISCV_IOMMU_INTR_COUNT];
+
+ /* Memory Regions for MSIX table and pending bit entries. */
+ MemoryRegion msix_table_mmio;
+ MemoryRegion msix_pba_mmio;
+ uint8_t *msix_table;
+ uint8_t *msix_pba;
+};
+
+static uint64_t msix_table_mmio_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ RISCVIOMMUStateSys *s = opaque;
+
+ g_assert(addr + size <= RISCV_IOMMU_PCI_MSIX_VECTORS *
PCI_MSIX_ENTRY_SIZE);
+ return pci_get_long(s->msix_table + addr);
+}
+
+static void msix_table_mmio_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ RISCVIOMMUStateSys *s = opaque;
+
+ g_assert(addr + size <= RISCV_IOMMU_PCI_MSIX_VECTORS *
PCI_MSIX_ENTRY_SIZE);
+ pci_set_long(s->msix_table + addr, val);
+}
+
+static const MemoryRegionOps msix_table_mmio_ops = {
+ .read = msix_table_mmio_read,
+ .write = msix_table_mmio_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+ .impl = {
+ .max_access_size = 4,
+ },
+};
+
+static uint64_t msix_pba_mmio_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ RISCVIOMMUStateSys *s = opaque;
+
+ return pci_get_long(s->msix_pba + addr);
+}
+
+static void msix_pba_mmio_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+}
+
+static const MemoryRegionOps msix_pba_mmio_ops = {
+ .read = msix_pba_mmio_read,
+ .write = msix_pba_mmio_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 8,
+ },
+ .impl = {
+ .max_access_size = 4,
+ },
};
+static void riscv_iommu_sysdev_init_msi(RISCVIOMMUStateSys *s,
+ uint32_t n_vectors)
+{
+ RISCVIOMMUState *iommu = &s->iommu;
+ uint32_t table_size = table_size = n_vectors * PCI_MSIX_ENTRY_SIZE;
+ uint32_t table_offset = RISCV_IOMMU_REG_MSI_CONFIG;
+ uint32_t pba_size = QEMU_ALIGN_UP(n_vectors, 64) / 8;
+ uint32_t pba_offset = RISCV_IOMMU_REG_MSI_CONFIG + 256;
+
+ s->msix_table = g_malloc0(table_size);
+ s->msix_pba = g_malloc0(pba_size);
+
+ memory_region_init_io(&s->msix_table_mmio, OBJECT(s), &msix_table_mmio_ops,
+ s, "msix-table", table_size);
+ memory_region_add_subregion(&iommu->regs_mr, table_offset,
+ &s->msix_table_mmio);
+
+ memory_region_init_io(&s->msix_pba_mmio, OBJECT(s), &msix_pba_mmio_ops, s,
+ "msix-pba", pba_size);
+ memory_region_add_subregion(&iommu->regs_mr, pba_offset,
+ &s->msix_pba_mmio);
+}
+
+static void riscv_iommu_sysdev_send_MSI(RISCVIOMMUStateSys *s,
+ uint32_t vector)
+{
+ uint8_t *table_entry = s->msix_table + vector * PCI_MSIX_ENTRY_SIZE;
+ uint64_t msi_addr = pci_get_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR);
+ uint32_t msi_data = pci_get_long(table_entry + PCI_MSIX_ENTRY_DATA);
+ MemTxResult result;
+
+ address_space_stl_le(&address_space_memory, msi_addr,
+ msi_data, MEMTXATTRS_UNSPECIFIED, &result);
+ trace_riscv_iommu_sys_msi_sent(vector, msi_addr, msi_data, result);
+}
+
static void riscv_iommu_sysdev_notify(RISCVIOMMUState *iommu,
unsigned vector)
{
RISCVIOMMUStateSys *s = container_of(iommu, RISCVIOMMUStateSys, iommu);
uint32_t fctl = riscv_iommu_reg_get32(iommu, RISCV_IOMMU_REG_FCTL);
- /* We do not support MSIs yet */
- if (!(fctl & RISCV_IOMMU_FCTL_WSI)) {
+ if (fctl & RISCV_IOMMU_FCTL_WSI) {
+ qemu_irq_pulse(s->irqs[vector]);
+ trace_riscv_iommu_sys_irq_sent(vector);
return;
}
- qemu_irq_pulse(s->irqs[vector]);
+ riscv_iommu_sysdev_send_MSI(s, vector);
}
static void riscv_iommu_sys_realize(DeviceState *dev, Error **errp)
@@ -82,6 +188,8 @@ static void riscv_iommu_sys_realize(DeviceState *dev, Error
**errp)
irq = qdev_get_gpio_in(s->irqchip, s->base_irq + i);
sysbus_connect_irq(sysdev, i, irq);
}
+
+ riscv_iommu_sysdev_init_msi(s, RISCV_IOMMU_PCI_MSIX_VECTORS);
}
static void riscv_iommu_sys_init(Object *obj)
@@ -93,7 +201,7 @@ static void riscv_iommu_sys_init(Object *obj)
qdev_alias_all_properties(DEVICE(iommu), obj);
iommu->icvec_avail_vectors = RISCV_IOMMU_SYSDEV_ICVEC_VECTORS;
- riscv_iommu_set_cap_igs(iommu, RISCV_IOMMU_CAP_IGS_WSI);
+ riscv_iommu_set_cap_igs(iommu, RISCV_IOMMU_CAP_IGS_BOTH);
}
static Property riscv_iommu_sys_properties[] = {
diff --git a/hw/riscv/trace-events b/hw/riscv/trace-events
index 0527c56c91..94facbb8b1 100644
--- a/hw/riscv/trace-events
+++ b/hw/riscv/trace-events
@@ -15,3 +15,5 @@ riscv_iommu_icvec_write(uint32_t orig, uint32_t actual)
"ICVEC write: incoming 0
riscv_iommu_ats(const char *id, unsigned b, unsigned d, unsigned f, uint64_t
iova) "%s: translate request %04x:%02x.%u iova: 0x%"PRIx64
riscv_iommu_ats_inval(const char *id) "%s: dev-iotlb invalidate"
riscv_iommu_ats_prgr(const char *id) "%s: dev-iotlb page request group
response"
+riscv_iommu_sys_irq_sent(uint32_t vector) "IRQ sent to vector %u"
+riscv_iommu_sys_msi_sent(uint32_t vector, uint64_t msi_addr, uint32_t
msi_data, uint32_t result) "MSI sent to vector %u msi_addr 0x%lx msi_data 0x%x
result %u"
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 23d1380b86..281fc65cc6 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -1043,6 +1043,7 @@ static void create_fdt_virtio_iommu(RISCVVirtState *s,
uint16_t bdf)
}
static void create_fdt_iommu_sys(RISCVVirtState *s, uint32_t irq_chip,
+ uint32_t msi_phandle,
uint32_t *iommu_sys_phandle)
{
const char comp[] = "riscv,iommu";
@@ -1077,6 +1078,8 @@ static void create_fdt_iommu_sys(RISCVVirtState *s,
uint32_t irq_chip,
iommu_irq_map[2], FDT_IRQ_TYPE_EDGE_LOW,
iommu_irq_map[3], FDT_IRQ_TYPE_EDGE_LOW);
+ qemu_fdt_setprop_cell(fdt, iommu_node, "msi-parent", msi_phandle);
+
*iommu_sys_phandle = iommu_phandle;
}
@@ -1117,7 +1120,8 @@ static void finalize_fdt(RISCVVirtState *s)
create_fdt_virtio(s, virt_memmap, irq_virtio_phandle);
if (virt_is_iommu_sys_enabled(s)) {
- create_fdt_iommu_sys(s, irq_mmio_phandle, &iommu_sys_phandle);
+ create_fdt_iommu_sys(s, irq_mmio_phandle, msi_pcie_phandle,
+ &iommu_sys_phandle);
}
create_fdt_pcie(s, virt_memmap, irq_pcie_phandle, msi_pcie_phandle,
iommu_sys_phandle);
--
2.45.2
