powerpc/powernv: allocate sparse PE# when using M64 BAR in Single PE mode

When M64 BAR is set to Single PE mode, the PE# assigned to VF could be
sparse.

This patch restructures the code to allocate sparse PE# for VFs when M64
BAR is set to Single PE mode. Also it rename the offset to pe_num_map to
reflect the content is the PE number.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 11d3543..b0b43f5 100644 (file)
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -215,7 +215,7 @@ struct pci_dn {
 #ifdef CONFIG_PCI_IOV
        u16     vfs_expanded;           /* number of VFs IOV BAR expanded */
        u16     num_vfs;                /* number of VFs enabled*/
-       int     offset;                 /* PE# for the first VF PE */
+       int     *pe_num_map;            /* PE# for the first VF PE or array */
        bool    m64_single_mode;        /* Use M64 BAR in Single Mode */
 #define IODA_INVALID_M64        (-1)
        int     (*m64_map)[PCI_SRIOV_NUM_BARS];

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 0c7e6ba..dc86858 100644 (file)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1285,7 +1285,7 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
 
                        /* Map the M64 here */
                        if (pdn->m64_single_mode) {
-                               pe_num = pdn->offset + j;
+                               pe_num = pdn->pe_num_map[j];
                                rc = opal_pci_map_pe_mmio_window(phb->opal_id,
                                                pe_num, OPAL_M64_WINDOW_TYPE,
                                                pdn->m64_map[j][i], 0);
@@ -1389,7 +1389,7 @@ void pnv_pci_sriov_disable(struct pci_dev *pdev)
        struct pnv_phb        *phb;
        struct pci_dn         *pdn;
        struct pci_sriov      *iov;
-       u16 num_vfs;
+       u16                    num_vfs, i;
 
        bus = pdev->bus;
        hose = pci_bus_to_host(bus);
@@ -1403,14 +1403,21 @@ void pnv_pci_sriov_disable(struct pci_dev *pdev)
 
        if (phb->type == PNV_PHB_IODA2) {
                if (!pdn->m64_single_mode)
-                       pnv_pci_vf_resource_shift(pdev, -pdn->offset);
+                       pnv_pci_vf_resource_shift(pdev, -*pdn->pe_num_map);
 
                /* Release M64 windows */
                pnv_pci_vf_release_m64(pdev, num_vfs);
 
                /* Release PE numbers */
-               bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
-               pdn->offset = 0;
+               if (pdn->m64_single_mode) {
+                       for (i = 0; i < num_vfs; i++) {
+                               if (pdn->pe_num_map[i] != IODA_INVALID_PE)
+                                       pnv_ioda_free_pe(phb, pdn->pe_num_map[i]);
+                       }
+               } else
+                       bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);
+               /* Releasing pe_num_map */
+               kfree(pdn->pe_num_map);
        }
 }
 
@@ -1436,7 +1443,10 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
 
        /* Reserve PE for each VF */
        for (vf_index = 0; vf_index < num_vfs; vf_index++) {
-               pe_num = pdn->offset + vf_index;
+               if (pdn->m64_single_mode)
+                       pe_num = pdn->pe_num_map[vf_index];
+               else
+                       pe_num = *pdn->pe_num_map + vf_index;
 
                pe = &phb->ioda.pe_array[pe_num];
                pe->pe_number = pe_num;
@@ -1478,6 +1488,7 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
        struct pnv_phb        *phb;
        struct pci_dn         *pdn;
        int                    ret;
+       u16                    i;
 
        bus = pdev->bus;
        hose = pci_bus_to_host(bus);
@@ -1500,20 +1511,44 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
                        return -EBUSY;
                }
 
+               /* Allocating pe_num_map */
+               if (pdn->m64_single_mode)
+                       pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map) * num_vfs,
+                                       GFP_KERNEL);
+               else
+                       pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map), GFP_KERNEL);
+
+               if (!pdn->pe_num_map)
+                       return -ENOMEM;
+
+               if (pdn->m64_single_mode)
+                       for (i = 0; i < num_vfs; i++)
+                               pdn->pe_num_map[i] = IODA_INVALID_PE;
+
                /* Calculate available PE for required VFs */
-               mutex_lock(&phb->ioda.pe_alloc_mutex);
-               pdn->offset = bitmap_find_next_zero_area(
-                       phb->ioda.pe_alloc, phb->ioda.total_pe,
-                       0, num_vfs, 0);
-               if (pdn->offset >= phb->ioda.total_pe) {
+               if (pdn->m64_single_mode) {
+                       for (i = 0; i < num_vfs; i++) {
+                               pdn->pe_num_map[i] = pnv_ioda_alloc_pe(phb);
+                               if (pdn->pe_num_map[i] == IODA_INVALID_PE) {
+                                       ret = -EBUSY;
+                                       goto m64_failed;
+                               }
+                       }
+               } else {
+                       mutex_lock(&phb->ioda.pe_alloc_mutex);
+                       *pdn->pe_num_map = bitmap_find_next_zero_area(
+                               phb->ioda.pe_alloc, phb->ioda.total_pe,
+                               0, num_vfs, 0);
+                       if (*pdn->pe_num_map >= phb->ioda.total_pe) {
+                               mutex_unlock(&phb->ioda.pe_alloc_mutex);
+                               dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs);
+                               kfree(pdn->pe_num_map);
+                               return -EBUSY;
+                       }
+                       bitmap_set(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);
                        mutex_unlock(&phb->ioda.pe_alloc_mutex);
-                       dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs);
-                       pdn->offset = 0;
-                       return -EBUSY;
                }
-               bitmap_set(phb->ioda.pe_alloc, pdn->offset, num_vfs);
                pdn->num_vfs = num_vfs;
-               mutex_unlock(&phb->ioda.pe_alloc_mutex);
 
                /* Assign M64 window accordingly */
                ret = pnv_pci_vf_assign_m64(pdev, num_vfs);
@@ -1528,7 +1563,7 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
                 * Otherwise, the PE# for the VF will conflict with others.
                 */
                if (!pdn->m64_single_mode) {
-                       ret = pnv_pci_vf_resource_shift(pdev, pdn->offset);
+                       ret = pnv_pci_vf_resource_shift(pdev, *pdn->pe_num_map);
                        if (ret)
                                goto m64_failed;
                }
@@ -1540,8 +1575,16 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
        return 0;
 
 m64_failed:
-       bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
-       pdn->offset = 0;
+       if (pdn->m64_single_mode) {
+               for (i = 0; i < num_vfs; i++) {
+                       if (pdn->pe_num_map[i] != IODA_INVALID_PE)
+                               pnv_ioda_free_pe(phb, pdn->pe_num_map[i]);
+               }
+       } else
+               bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);
+
+       /* Releasing pe_num_map */
+       kfree(pdn->pe_num_map);
 
        return ret;
 }