From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39398) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YdDpM-00064U-Gf for qemu-devel@nongnu.org; Wed, 01 Apr 2015 04:16:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YdDpL-0002oM-8q for qemu-devel@nongnu.org; Wed, 01 Apr 2015 04:16:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35612) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YdDpL-0002oC-1k for qemu-devel@nongnu.org; Wed, 01 Apr 2015 04:16:43 -0400 From: Jason Wang Date: Wed, 1 Apr 2015 16:15:11 +0800 Message-Id: <1427876112-12615-18-git-send-email-jasowang@redhat.com> In-Reply-To: <1427876112-12615-1-git-send-email-jasowang@redhat.com> References: <1427876112-12615-1-git-send-email-jasowang@redhat.com> Subject: [Qemu-devel] [PATCH V5 17/18] pci: remove hard-coded bar size in msix_init_exclusive_bar() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , mst@redhat.com, Jason Wang , Keith Busch , Stefan Hajnoczi , cornelia.huck@de.ibm.com This patch lets msix_init_exclusive_bar() can calculate the bar and pba size according to the number of MSI-X vectors other than using a hard-coded limit 4096. This is needed to allow device to have more than 128 MSI_X vectors. An extra legacy_layout parameter was introduced to use legacy static 4096 bar size to keep the migration compatibility. Virtio device will be the first user for this. Cc: Keith Busch Cc: Kevin Wolf Cc: Stefan Hajnoczi Cc: Michael S. Tsirkin Signed-off-by: Jason Wang --- hw/block/nvme.c | 2 +- hw/misc/ivshmem.c | 2 +- hw/pci/msix.c | 47 +++++++++++++++++++++++++++++------------------ hw/virtio/virtio-pci.c | 2 +- include/hw/pci/msix.h | 2 +- 5 files changed, 33 insertions(+), 22 deletions(-) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index 1e07166..9af6e1e 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -787,7 +787,7 @@ static int nvme_init(PCIDevice *pci_dev) pci_register_bar(&n->parent_obj, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64, &n->iomem); - msix_init_exclusive_bar(&n->parent_obj, n->num_queues, 4); + msix_init_exclusive_bar(&n->parent_obj, n->num_queues, 4, true); id->vid = cpu_to_le16(pci_get_word(pci_conf + PCI_VENDOR_ID)); id->ssvid = cpu_to_le16(pci_get_word(pci_conf + PCI_SUBSYSTEM_VENDOR_ID)); diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index 5d272c8..6ae48ae 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -631,7 +631,7 @@ static uint64_t ivshmem_get_size(IVShmemState * s) { static void ivshmem_setup_msi(IVShmemState * s) { - if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) { + if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1, true)) { IVSHMEM_DPRINTF("msix initialization failed\n"); exit(1); } diff --git a/hw/pci/msix.c b/hw/pci/msix.c index 24de260..8c6d8f3 100644 --- a/hw/pci/msix.c +++ b/hw/pci/msix.c @@ -291,33 +291,44 @@ int msix_init(struct PCIDevice *dev, unsigned short nentries, } int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries, - uint8_t bar_nr) + uint8_t bar_nr, bool legacy_layout) { int ret; char *name; - - /* - * Migration compatibility dictates that this remains a 4k - * BAR with the vector table in the lower half and PBA in - * the upper half. Do not use these elsewhere! - */ -#define MSIX_EXCLUSIVE_BAR_SIZE 4096 -#define MSIX_EXCLUSIVE_BAR_TABLE_OFFSET 0 -#define MSIX_EXCLUSIVE_BAR_PBA_OFFSET (MSIX_EXCLUSIVE_BAR_SIZE / 2) -#define MSIX_EXCLUSIVE_CAP_OFFSET 0 - - if (nentries * PCI_MSIX_ENTRY_SIZE > MSIX_EXCLUSIVE_BAR_PBA_OFFSET) { - return -EINVAL; + uint32_t bar_size; + uint32_t bar_pba_offset; + + if (legacy_layout) { + /* + * Migration compatibility dictates that this remains a 4k + * BAR with the vector table in the lower half and PBA in + * the upper half. Do not use these elsewhere! + */ + bar_size = 4096; + bar_pba_offset = bar_size / 2; + + if (nentries * PCI_MSIX_ENTRY_SIZE > bar_pba_offset) { + return -EINVAL; + } + } else { + bar_pba_offset = nentries * PCI_MSIX_ENTRY_SIZE; + bar_size = bar_pba_offset + (nentries / 8 + 1) * 8; + if (bar_size & (bar_size - 1)) { + bar_size = 1 << qemu_fls(bar_size); + } + if (bar_size < 4096) { + bar_size = 4096; + } } name = g_strdup_printf("%s-msix", dev->name); - memory_region_init(&dev->msix_exclusive_bar, OBJECT(dev), name, MSIX_EXCLUSIVE_BAR_SIZE); + memory_region_init(&dev->msix_exclusive_bar, OBJECT(dev), name, bar_size); g_free(name); ret = msix_init(dev, nentries, &dev->msix_exclusive_bar, bar_nr, - MSIX_EXCLUSIVE_BAR_TABLE_OFFSET, &dev->msix_exclusive_bar, - bar_nr, MSIX_EXCLUSIVE_BAR_PBA_OFFSET, - MSIX_EXCLUSIVE_CAP_OFFSET); + 0, &dev->msix_exclusive_bar, + bar_nr, bar_pba_offset, + 0); if (ret) { return ret; } diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 02e3ce8..816a706 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -937,7 +937,7 @@ static void virtio_pci_device_plugged(DeviceState *d) config[PCI_INTERRUPT_PIN] = 1; if (proxy->nvectors && - msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) { + msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1, true)) { error_report("unable to init msix vectors to %" PRIu32, proxy->nvectors); proxy->nvectors = 0; diff --git a/include/hw/pci/msix.h b/include/hw/pci/msix.h index 954d82b..6c19535 100644 --- a/include/hw/pci/msix.h +++ b/include/hw/pci/msix.h @@ -11,7 +11,7 @@ int msix_init(PCIDevice *dev, unsigned short nentries, unsigned table_offset, MemoryRegion *pba_bar, uint8_t pba_bar_nr, unsigned pba_offset, uint8_t cap_pos); int msix_init_exclusive_bar(PCIDevice *dev, unsigned short nentries, - uint8_t bar_nr); + uint8_t bar_nr, bool legacy_layout); void msix_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len); -- 2.1.0