[PATCH V4 3/6] powerpc/powernv: use one M64 BAR in Single PE mode for one VF BAR
Wei Yang
weiyang at linux.vnet.ibm.com
Thu Oct 8 18:06:13 AEDT 2015
On Fri, Oct 02, 2015 at 07:29:29PM +1000, Alexey Kardashevskiy wrote:
>On 08/19/2015 12:01 PM, Wei Yang wrote:
>>In current implementation, when VF BAR is bigger than 64MB, it uses 4 M64
>>BARs in Single PE mode to cover the number of VFs required to be enabled.
>>By doing so, several VFs would be in one VF Group and leads to interference
>>between VFs in the same group.
>>
>>And in this patch, m64_wins is renamed to m64_map, which means index number
>>of the M64 BAR used to map the VF BAR. Based on Gavin's comments.
>>
>>This patch changes the design by using one M64 BAR in Single PE mode for
>>one VF BAR. This gives absolute isolation for VFs.
>>
>>Signed-off-by: Wei Yang <weiyang at linux.vnet.ibm.com>
>>---
>> arch/powerpc/include/asm/pci-bridge.h | 5 +-
>> arch/powerpc/platforms/powernv/pci-ioda.c | 178 ++++++++++++-----------------
>> 2 files changed, 74 insertions(+), 109 deletions(-)
>>
>>diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
>>index 712add5..8aeba4c 100644
>>--- a/arch/powerpc/include/asm/pci-bridge.h
>>+++ b/arch/powerpc/include/asm/pci-bridge.h
>>@@ -214,10 +214,9 @@ struct pci_dn {
>> u16 vfs_expanded; /* number of VFs IOV BAR expanded */
>> u16 num_vfs; /* number of VFs enabled*/
>> int offset; /* PE# for the first VF PE */
>>-#define M64_PER_IOV 4
>>- int m64_per_iov;
>>+ bool m64_single_mode; /* Use M64 BAR in Single Mode */
>> #define IODA_INVALID_M64 (-1)
>>- int m64_wins[PCI_SRIOV_NUM_BARS][M64_PER_IOV];
>>+ int (*m64_map)[PCI_SRIOV_NUM_BARS];
>> #endif /* CONFIG_PCI_IOV */
>> #endif
>> struct list_head child_list;
>>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>>index e3e0acb..de7db1d 100644
>>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>>@@ -1148,29 +1148,36 @@ static void pnv_pci_ioda_setup_PEs(void)
>> }
>>
>> #ifdef CONFIG_PCI_IOV
>>-static int pnv_pci_vf_release_m64(struct pci_dev *pdev)
>>+static int pnv_pci_vf_release_m64(struct pci_dev *pdev, u16 num_vfs)
>> {
>> struct pci_bus *bus;
>> struct pci_controller *hose;
>> struct pnv_phb *phb;
>> struct pci_dn *pdn;
>> int i, j;
>>+ int m64_bars;
>>
>> bus = pdev->bus;
>> hose = pci_bus_to_host(bus);
>> phb = hose->private_data;
>> pdn = pci_get_pdn(pdev);
>>
>>+ if (pdn->m64_single_mode)
>>+ m64_bars = num_vfs;
>>+ else
>>+ m64_bars = 1;
>>+
>> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
>>- for (j = 0; j < M64_PER_IOV; j++) {
>>- if (pdn->m64_wins[i][j] == IODA_INVALID_M64)
>>+ for (j = 0; j < m64_bars; j++) {
>>+ if (pdn->m64_map[j][i] == IODA_INVALID_M64)
>> continue;
>> opal_pci_phb_mmio_enable(phb->opal_id,
>>- OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 0);
>>- clear_bit(pdn->m64_wins[i][j], &phb->ioda.m64_bar_alloc);
>>- pdn->m64_wins[i][j] = IODA_INVALID_M64;
>>+ OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 0);
>>+ clear_bit(pdn->m64_map[j][i], &phb->ioda.m64_bar_alloc);
>>+ pdn->m64_map[j][i] = IODA_INVALID_M64;
>> }
>>
>>+ kfree(pdn->m64_map);
>> return 0;
>> }
>>
>>@@ -1187,8 +1194,7 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> int total_vfs;
>> resource_size_t size, start;
>> int pe_num;
>>- int vf_groups;
>>- int vf_per_group;
>>+ int m64_bars;
>>
>> bus = pdev->bus;
>> hose = pci_bus_to_host(bus);
>>@@ -1196,26 +1202,26 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> pdn = pci_get_pdn(pdev);
>> total_vfs = pci_sriov_get_totalvfs(pdev);
>>
>>- /* Initialize the m64_wins to IODA_INVALID_M64 */
>>- for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
>>- for (j = 0; j < M64_PER_IOV; j++)
>>- pdn->m64_wins[i][j] = IODA_INVALID_M64;
>>+ if (pdn->m64_single_mode)
>>+ m64_bars = num_vfs;
>>+ else
>>+ m64_bars = 1;
>>+
>>+ pdn->m64_map = kmalloc(sizeof(*pdn->m64_map) * m64_bars, GFP_KERNEL);
>>+ if (!pdn->m64_map)
>>+ return -ENOMEM;
>>+ /* Initialize the m64_map to IODA_INVALID_M64 */
>>+ for (i = 0; i < m64_bars ; i++)
>>+ for (j = 0; j < PCI_SRIOV_NUM_BARS; j++)
>>+ pdn->m64_map[i][j] = IODA_INVALID_M64;
>>
>>- if (pdn->m64_per_iov == M64_PER_IOV) {
>>- vf_groups = (num_vfs <= M64_PER_IOV) ? num_vfs: M64_PER_IOV;
>>- vf_per_group = (num_vfs <= M64_PER_IOV)? 1:
>>- roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
>>- } else {
>>- vf_groups = 1;
>>- vf_per_group = 1;
>>- }
>>
>> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
>> res = &pdev->resource[i + PCI_IOV_RESOURCES];
>> if (!res->flags || !res->parent)
>> continue;
>>
>>- for (j = 0; j < vf_groups; j++) {
>>+ for (j = 0; j < m64_bars; j++) {
>> do {
>> win = find_next_zero_bit(&phb->ioda.m64_bar_alloc,
>> phb->ioda.m64_bar_idx + 1, 0);
>>@@ -1224,12 +1230,11 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> goto m64_failed;
>> } while (test_and_set_bit(win, &phb->ioda.m64_bar_alloc));
>>
>>- pdn->m64_wins[i][j] = win;
>>+ pdn->m64_map[j][i] = win;
>>
>>- if (pdn->m64_per_iov == M64_PER_IOV) {
>>+ if (pdn->m64_single_mode) {
>> size = pci_iov_resource_size(pdev,
>> PCI_IOV_RESOURCES + i);
>>- size = size * vf_per_group;
>> start = res->start + size * j;
>> } else {
>> size = resource_size(res);
>>@@ -1237,16 +1242,16 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> }
>>
>> /* Map the M64 here */
>>- if (pdn->m64_per_iov == M64_PER_IOV) {
>>+ if (pdn->m64_single_mode) {
>> pe_num = pdn->offset + j;
>> rc = opal_pci_map_pe_mmio_window(phb->opal_id,
>> pe_num, OPAL_M64_WINDOW_TYPE,
>>- pdn->m64_wins[i][j], 0);
>>+ pdn->m64_map[j][i], 0);
>> }
>>
>> rc = opal_pci_set_phb_mem_window(phb->opal_id,
>> OPAL_M64_WINDOW_TYPE,
>>- pdn->m64_wins[i][j],
>>+ pdn->m64_map[j][i],
>> start,
>> 0, /* unused */
>> size);
>>@@ -1258,12 +1263,12 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> goto m64_failed;
>> }
>>
>>- if (pdn->m64_per_iov == M64_PER_IOV)
>>+ if (pdn->m64_single_mode)
>> rc = opal_pci_phb_mmio_enable(phb->opal_id,
>>- OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 2);
>>+ OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 2);
>> else
>> rc = opal_pci_phb_mmio_enable(phb->opal_id,
>>- OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 1);
>>+ OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 1);
>>
>> if (rc != OPAL_SUCCESS) {
>> dev_err(&pdev->dev, "Failed to enable M64 window #%d: %llx\n",
>>@@ -1275,7 +1280,7 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>> return 0;
>>
>> m64_failed:
>>- pnv_pci_vf_release_m64(pdev);
>>+ pnv_pci_vf_release_m64(pdev, num_vfs);
>> return -EBUSY;
>> }
>>
>>@@ -1302,15 +1307,13 @@ static void pnv_pci_ioda2_release_dma_pe(struct pci_dev *dev, struct pnv_ioda_pe
>> iommu_free_table(tbl, of_node_full_name(dev->dev.of_node));
>> }
>>
>>-static void pnv_ioda_release_vf_PE(struct pci_dev *pdev, u16 num_vfs)
>>+static void pnv_ioda_release_vf_PE(struct pci_dev *pdev)
>> {
>> struct pci_bus *bus;
>> struct pci_controller *hose;
>> struct pnv_phb *phb;
>> struct pnv_ioda_pe *pe, *pe_n;
>> struct pci_dn *pdn;
>>- u16 vf_index;
>>- int64_t rc;
>>
>> bus = pdev->bus;
>> hose = pci_bus_to_host(bus);
>>@@ -1320,35 +1323,6 @@ static void pnv_ioda_release_vf_PE(struct pci_dev *pdev, u16 num_vfs)
>> if (!pdev->is_physfn)
>> return;
>>
>>- if (pdn->m64_per_iov == M64_PER_IOV && num_vfs > M64_PER_IOV) {
>>- int vf_group;
>>- int vf_per_group;
>>- int vf_index1;
>>-
>>- vf_per_group = roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
>>-
>>- for (vf_group = 0; vf_group < M64_PER_IOV; vf_group++)
>>- for (vf_index = vf_group * vf_per_group;
>>- vf_index < (vf_group + 1) * vf_per_group &&
>>- vf_index < num_vfs;
>>- vf_index++)
>>- for (vf_index1 = vf_group * vf_per_group;
>>- vf_index1 < (vf_group + 1) * vf_per_group &&
>>- vf_index1 < num_vfs;
>>- vf_index1++){
>>-
>>- rc = opal_pci_set_peltv(phb->opal_id,
>>- pdn->offset + vf_index,
>>- pdn->offset + vf_index1,
>>- OPAL_REMOVE_PE_FROM_DOMAIN);
>>-
>>- if (rc)
>>- dev_warn(&pdev->dev, "%s: Failed to unlink same group PE#%d(%lld)\n",
>>- __func__,
>>- pdn->offset + vf_index1, rc);
>>- }
>>- }
>>-
>> list_for_each_entry_safe(pe, pe_n, &phb->ioda.pe_list, list) {
>> if (pe->parent_dev != pdev)
>> continue;
>>@@ -1383,14 +1357,14 @@ void pnv_pci_sriov_disable(struct pci_dev *pdev)
>> num_vfs = pdn->num_vfs;
>>
>> /* Release VF PEs */
>>- pnv_ioda_release_vf_PE(pdev, num_vfs);
>>+ pnv_ioda_release_vf_PE(pdev);
>>
>> if (phb->type == PNV_PHB_IODA2) {
>>- if (pdn->m64_per_iov == 1)
>>+ if (!pdn->m64_single_mode)
>> pnv_pci_vf_resource_shift(pdev, -pdn->offset);
>>
>> /* Release M64 windows */
>>- pnv_pci_vf_release_m64(pdev);
>>+ pnv_pci_vf_release_m64(pdev, num_vfs);
>>
>> /* Release PE numbers */
>> bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
>>@@ -1409,7 +1383,6 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
>> int pe_num;
>> u16 vf_index;
>> struct pci_dn *pdn;
>>- int64_t rc;
>>
>> bus = pdev->bus;
>> hose = pci_bus_to_host(bus);
>>@@ -1454,37 +1427,6 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
>>
>> pnv_pci_ioda2_setup_dma_pe(phb, pe);
>> }
>>-
>>- if (pdn->m64_per_iov == M64_PER_IOV && num_vfs > M64_PER_IOV) {
>>- int vf_group;
>>- int vf_per_group;
>>- int vf_index1;
>>-
>>- vf_per_group = roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
>>-
>>- for (vf_group = 0; vf_group < M64_PER_IOV; vf_group++) {
>>- for (vf_index = vf_group * vf_per_group;
>>- vf_index < (vf_group + 1) * vf_per_group &&
>>- vf_index < num_vfs;
>>- vf_index++) {
>>- for (vf_index1 = vf_group * vf_per_group;
>>- vf_index1 < (vf_group + 1) * vf_per_group &&
>>- vf_index1 < num_vfs;
>>- vf_index1++) {
>>-
>>- rc = opal_pci_set_peltv(phb->opal_id,
>>- pdn->offset + vf_index,
>>- pdn->offset + vf_index1,
>>- OPAL_ADD_PE_TO_DOMAIN);
>>-
>>- if (rc)
>>- dev_warn(&pdev->dev, "%s: Failed to link same group PE#%d(%lld)\n",
>>- __func__,
>>- pdn->offset + vf_index1, rc);
>>- }
>>- }
>>- }
>>- }
>> }
>>
>> int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>>@@ -1507,6 +1449,15 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>> return -ENOSPC;
>> }
>>
>>+ /*
>>+ * When M64 BARs functions in Single PE mode, the number of VFs
>>+ * could be enabled must be less than the number of M64 BARs.
>>+ */
>>+ if (pdn->m64_single_mode && num_vfs > phb->ioda.m64_bar_idx) {
>
>
>m64_bar_idx is not really the maximum number of M64 BARs, you program it to
>store the latest number but after some future rework/hardware update you
>might want to change it to be not the last M64 BAR and you will have to
>update this check as well.
>
>Instead of doing:
>arch/powerpc/platforms/powernv/pci-ioda.c|374| phb->ioda.m64_bar_idx = 15;
>do
>#define PCI_IODA2_M64_BAR_NUM 15
>and use new macro everywhere.
>Or read from OPAL if it tells about it.
>
I didn't touch this field since this is not that related to SRIOV.
And I prefer the OPAL way, or device tree way, which need to do some
modification in skiboot. If you think it is ok, I would send a separate patch
to fix this in both skiboot and kernel.
>
>
>>+ dev_info(&pdev->dev, "Not enough M64 BAR for VFs\n");
>>+ return -EBUSY;
>>+ }
>>+
>> /* Calculate available PE for required VFs */
>> mutex_lock(&phb->ioda.pe_alloc_mutex);
>> pdn->offset = bitmap_find_next_zero_area(
>>@@ -1534,7 +1485,7 @@ int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>> * the IOV BAR according to the PE# allocated to the VFs.
>> * Otherwise, the PE# for the VF will conflict with others.
>> */
>>- if (pdn->m64_per_iov == 1) {
>>+ if (!pdn->m64_single_mode) {
>> ret = pnv_pci_vf_resource_shift(pdev, pdn->offset);
>> if (ret)
>> goto m64_failed;
>>@@ -1567,8 +1518,7 @@ int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
>> /* Allocate PCI data */
>> add_dev_pci_data(pdev);
>>
>>- pnv_pci_sriov_enable(pdev, num_vfs);
>>- return 0;
>>+ return pnv_pci_sriov_enable(pdev, num_vfs);
>> }
>> #endif /* CONFIG_PCI_IOV */
>>
>>@@ -2762,9 +2712,9 @@ static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
>>
>> pdn = pci_get_pdn(pdev);
>> pdn->vfs_expanded = 0;
>>+ pdn->m64_single_mode = false;
>>
>> total_vfs = pci_sriov_get_totalvfs(pdev);
>>- pdn->m64_per_iov = 1;
>> mul = phb->ioda.total_pe;
>>
>> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
>>@@ -2784,8 +2734,8 @@ static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
>> if (size > (1 << 26)) {
>> dev_info(&pdev->dev, "PowerNV: VF BAR%d: %pR IOV size is bigger than 64M, roundup power2\n",
>> i, res);
>>- pdn->m64_per_iov = M64_PER_IOV;
>> mul = roundup_pow_of_two(total_vfs);
>>+ pdn->m64_single_mode = true;
>> break;
>> }
>> }
>>@@ -2987,6 +2937,8 @@ static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
>> static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
>> int resno)
>> {
>>+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
>>+ struct pnv_phb *phb = hose->private_data;
>> struct pci_dn *pdn = pci_get_pdn(pdev);
>> resource_size_t align;
>>
>>@@ -2995,12 +2947,26 @@ static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
>> * SR-IOV. While from hardware perspective, the range mapped by M64
>> * BAR should be size aligned.
>> *
>>+ * When IOV BAR is mapped with M64 BAR in Single PE mode, the extra
>>+ * powernv-specific hardware restriction is gone. But if just use the
>>+ * VF BAR size as the alignment, PF BAR / VF BAR may be allocated with
>>+ * in one segment of M64 #15, which introduces the PE conflict between
>>+ * PF and VF. Based on this, the minimum alignment of an IOV BAR is
>>+ * m64_segsize.
>>+ *
>> * This function returns the total IOV BAR size if expanded or just the
>>- * individual size if not.
>>+ * individual size if not, when M64 BAR is in Shared PE mode.
>>+ * If the M64 BAR is in Single PE mode, return the VF BAR size or
>>+ * M64 segment size if IOV BAR size is less.
>
>"Expanded" == "non-shared M64 BAR"? I'd stick to the "non-shared".
>
Yes, your way is more friendly to audience.
The current comment is not accurate. The correct way is:
* This function returns the total IOV BAR size if M64 BAR is in Shared PE
* mode or just the individual size if not.
>
>> */
>> align = pci_iov_resource_size(pdev, resno);
>>- if (pdn->vfs_expanded)
>>- return pdn->vfs_expanded * align;
>>+ if (pdn->vfs_expanded) {
>>+ if (pdn->m64_single_mode)
>>+ return max(align,
>>+ (resource_size_t)phb->ioda.m64_segsize);
>>+ else
>>+ return pdn->vfs_expanded * align;
>>+ }
>>
>> return align;
>> }
>>
>
> if (!pdn->vfs_expanded)
> return align;
>
> if (pdn->m64_single_mode)
> return max(align, (resource_size_t)phb->ioda.m64_segsize);
>
> return pdn->vfs_expanded * align;
>
>Fewer braces/indents/line wraps :)
>
Yep~ Looks nice. Thanks!
>
>
>--
>Alexey
--
Richard Yang
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