pseries dma: DMA window params added to PHB and DT population changed

Previously the only PCI bus supported was the emulated PCI bus with
fixed DMA window with start at 0 and size 1GB. As we are going to support
PCI pass through which DMA window properties are set by the host
kernel, we have to support DMA windows with parameters other than default.

This patch adds:

1. DMA window properties to sPAPRPHBState: LIOBN (bus id), start,
size of the window.

2. An additional function spapr_dma_dt() to populate DMA window
properties in the device tree which simply accepts all the parameters
and does not try to guess what kind of IOMMU is given to it.
The original spapr_dma_dt() is renamed to spapr_tcet_dma_dt().

Signed-off-by: Alexey Kardashevskiy <[email protected]>
Signed-off-by: David Gibson <[email protected]>
Signed-off-by: Alexander Graf <[email protected]>

diff --git a/hw/spapr.h b/hw/spapr.h
index 6229769ce0f313d3136fe409d40b4f91fb78921b..ac34a171e3526acacaa61a3a76d131e921e42e61 100644 (file)
--- a/hw/spapr.h
+++ b/hw/spapr.h
@@ -337,6 +337,8 @@ void spapr_iommu_init(void);
 DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size);
 void spapr_tce_free(DMAContext *dma);
 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
-                 DMAContext *dma);
+                 uint32_t liobn, uint64_t window, uint32_t size);
+int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
+                      DMAContext *dma);
 
 #endif /* !defined (__HW_SPAPR_H__) */

diff --git a/hw/spapr_iommu.c b/hw/spapr_iommu.c
index 388ffa4b2279308f37221b94ecc93178c813f5e2..53b731773abc1f7e6d79fa3acd16a401f48771d7 100644 (file)
--- a/hw/spapr_iommu.c
+++ b/hw/spapr_iommu.c
@@ -216,31 +216,47 @@ void spapr_iommu_init(void)
 }
 
 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
-                 DMAContext *dma)
+                 uint32_t liobn, uint64_t window, uint32_t size)
 {
-    if (dma) {
-        sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
-        uint32_t dma_prop[] = {cpu_to_be32(tcet->liobn),
-                               0, 0,
-                               0, cpu_to_be32(tcet->window_size)};
-        int ret;
-
-        ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
-        if (ret < 0) {
-            return ret;
-        }
+    uint32_t dma_prop[5];
+    int ret;
+
+    dma_prop[0] = cpu_to_be32(liobn);
+    dma_prop[1] = cpu_to_be32(window >> 32);
+    dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
+    dma_prop[3] = 0; /* window size is 32 bits */
+    dma_prop[4] = cpu_to_be32(size);
+
+    ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
+    if (ret < 0) {
+        return ret;
+    }
 
-        ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
-        if (ret < 0) {
-            return ret;
-        }
+    ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
+    if (ret < 0) {
+        return ret;
+    }
 
-        ret = fdt_setprop(fdt, node_off, propname, dma_prop,
-                          sizeof(dma_prop));
-        if (ret < 0) {
-            return ret;
-        }
+    ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
+    if (ret < 0) {
+        return ret;
     }
 
     return 0;
 }
+
+int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
+                      DMAContext *iommu)
+{
+    if (!iommu) {
+        return 0;
+    }
+
+    if (iommu->translate == spapr_tce_translate) {
+        sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, iommu);
+        return spapr_dma_dt(fdt, node_off, propname,
+                tcet->liobn, 0, tcet->window_size);
+    }
+
+    return -1;
+}

diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c
index 780a4d6f161c4bda057c76ef5dc5e169c7a3682b..b92583a99124e501c137709ddebf1ae71cb8d85e 100644 (file)
--- a/hw/spapr_pci.c
+++ b/hw/spapr_pci.c
@@ -518,7 +518,6 @@ static int spapr_phb_init(SysBusDevice *s)
     char *namebuf;
     int i;
     PCIBus *bus;
-    uint32_t liobn;
 
     phb->dtbusname = g_strdup_printf("pci@%" PRIx64, phb->buid);
     namebuf = alloca(strlen(phb->dtbusname) + 32);
@@ -570,8 +569,10 @@ static int spapr_phb_init(SysBusDevice *s)
                            PCI_DEVFN(0, 0), PCI_NUM_PINS);
     phb->host_state.bus = bus;
 
-    liobn = SPAPR_PCI_BASE_LIOBN | (pci_find_domain(bus) << 16);
-    phb->dma = spapr_tce_new_dma_context(liobn, 0x40000000);
+    phb->dma_liobn = SPAPR_PCI_BASE_LIOBN | (pci_find_domain(bus) << 16);
+    phb->dma_window_start = 0;
+    phb->dma_window_size = 0x40000000;
+    phb->dma = spapr_tce_new_dma_context(phb->dma_liobn, phb->dma_window_size);
     pci_setup_iommu(bus, spapr_pci_dma_context_fn, phb);
 
     QLIST_INSERT_HEAD(&spapr->phbs, phb, list);
@@ -729,7 +730,9 @@ int spapr_populate_pci_dt(sPAPRPHBState *phb,
     _FDT(fdt_setprop(fdt, bus_off, "interrupt-map", &interrupt_map,
                      sizeof(interrupt_map)));
 
-    spapr_dma_dt(fdt, bus_off, "ibm,dma-window", phb->dma);
+    spapr_dma_dt(fdt, bus_off, "ibm,dma-window",
+                 phb->dma_liobn, phb->dma_window_start,
+                 phb->dma_window_size);
 
     return 0;
 }

diff --git a/hw/spapr_pci.h b/hw/spapr_pci.h
index 6892e4fae5c8f87de8809b5f6b92966dc709fafe..7518899b852aa5db7103edb6214236d45e687239 100644 (file)
--- a/hw/spapr_pci.h
+++ b/hw/spapr_pci.h
@@ -41,7 +41,9 @@ typedef struct sPAPRPHBState {
     target_phys_addr_t msi_win_addr;
     MemoryRegion memwindow, iowindow, msiwindow;
 
-
+    uint32_t dma_liobn;
+    uint64_t dma_window_start;
+    uint64_t dma_window_size;
     DMAContext *dma;
 
     struct {

diff --git a/hw/spapr_vio.c b/hw/spapr_vio.c
index 3abe853f3d778ab59ff3457d4bdd92084aa38ff2..7ca445216d71f6c2a8d6398d9454f41d20352e11 100644 (file)
--- a/hw/spapr_vio.c
+++ b/hw/spapr_vio.c
@@ -142,7 +142,7 @@ static int vio_make_devnode(VIOsPAPRDevice *dev,
         }
     }
 
-    ret = spapr_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->dma);
+    ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->dma);
     if (ret < 0) {
         return ret;
     }