[PATCH kernel 3/5] powerpc/powernv: Detach npu struct from pnv_phb
David Gibson
david at gibson.dropbear.id.au
Wed Nov 7 16:14:45 AEDT 2018
On Mon, Oct 15, 2018 at 08:32:59PM +1100, Alexey Kardashevskiy wrote:
> The powernv PCI code stores NPU data in the pnv_phb struct. The latter
> is referenced by pci_controller::private_data. We are going to have NPU2
> support in the pseries platform as well but it does not store any
> private_data in in the pci_controller struct; and even if it did,
> it would be a different data structure.
>
> This adds a global list of NPUs so each platform can register and use
> these in the same fashion.
>
> Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
> ---
> arch/powerpc/platforms/powernv/pci.h | 16 -------
> arch/powerpc/platforms/powernv/npu-dma.c | 71 +++++++++++++++++++++++++-------
> 2 files changed, 57 insertions(+), 30 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
> index 8b37b28..3b7617d 100644
> --- a/arch/powerpc/platforms/powernv/pci.h
> +++ b/arch/powerpc/platforms/powernv/pci.h
> @@ -8,9 +8,6 @@
>
> struct pci_dn;
>
> -/* Maximum possible number of ATSD MMIO registers per NPU */
> -#define NV_NMMU_ATSD_REGS 8
> -
> enum pnv_phb_type {
> PNV_PHB_IODA1 = 0,
> PNV_PHB_IODA2 = 1,
> @@ -180,19 +177,6 @@ struct pnv_phb {
> unsigned int diag_data_size;
> u8 *diag_data;
>
> - /* Nvlink2 data */
> - struct npu {
> - int index;
> - __be64 *mmio_atsd_regs[NV_NMMU_ATSD_REGS];
> - unsigned int mmio_atsd_count;
> -
> - /* Bitmask for MMIO register usage */
> - unsigned long mmio_atsd_usage;
> -
> - /* Do we need to explicitly flush the nest mmu? */
> - bool nmmu_flush;
> - } npu;
> -
> int p2p_target_count;
> };
>
> diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
> index 01402f9..cb2b4f9 100644
> --- a/arch/powerpc/platforms/powernv/npu-dma.c
> +++ b/arch/powerpc/platforms/powernv/npu-dma.c
> @@ -378,6 +378,25 @@ struct pnv_ioda_pe *pnv_pci_npu_setup_iommu(struct pnv_ioda_pe *npe)
> /*
> * NPU2 ATS
> */
> +/* Maximum possible number of ATSD MMIO registers per NPU */
> +#define NV_NMMU_ATSD_REGS 8
> +
> +struct npu {
> + int index;
> + __be64 *mmio_atsd_regs[NV_NMMU_ATSD_REGS];
> + unsigned int mmio_atsd_count;
> +
> + /* Bitmask for MMIO register usage */
> + unsigned long mmio_atsd_usage;
> +
> + /* Do we need to explicitly flush the nest mmu? */
> + bool nmmu_flush;
> +
> + struct list_head next;
> +
> + struct pci_controller *hose;
> +};
> +
> static struct {
> /*
> * spinlock to protect initialisation of an npu_context for
> @@ -396,22 +415,27 @@ static struct {
> uint64_t atsd_threshold;
> struct dentry *atsd_threshold_dentry;
>
> + struct list_head npu_list;
> } npu2_devices;
>
> void pnv_npu2_devices_init(void)
> {
> memset(&npu2_devices, 0, sizeof(npu2_devices));
> + INIT_LIST_HEAD(&npu2_devices.npu_list);
> spin_lock_init(&npu2_devices.context_lock);
> npu2_devices.atsd_threshold = 2 * 1024 * 1024;
> }
>
> static struct npu *npdev_to_npu(struct pci_dev *npdev)
> {
> - struct pnv_phb *nphb;
> + struct pci_controller *hose = pci_bus_to_host(npdev->bus);
> + struct npu *npu;
>
> - nphb = pci_bus_to_host(npdev->bus)->private_data;
> + list_for_each_entry(npu, &npu2_devices.npu_list, next)
> + if (hose == npu->hose)
> + return npu;
>
> - return &nphb->npu;
> + return NULL;
If you're introducing the possibility this can fail, should you also
be introducing checks for NULL in the callers?
> }
>
> /* Maximum number of nvlinks per npu */
> @@ -843,7 +867,7 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev,
> */
> WRITE_ONCE(npu_context->npdev[npu->index][nvlink_index], npdev);
>
> - if (!nphb->npu.nmmu_flush) {
> + if (!npu->nmmu_flush) {
Looks like this hunk belongs in the patch which introduced npdev_to_npu().
> /*
> * If we're not explicitly flushing ourselves we need to mark
> * the thread for global flushes
> @@ -967,6 +991,13 @@ int pnv_npu2_init(struct pnv_phb *phb)
> struct pci_dev *gpdev;
> static int npu_index;
> uint64_t rc = 0;
> + struct pci_controller *hose = phb->hose;
> + struct npu *npu;
> + int ret;
> +
> + npu = kzalloc(sizeof(*npu), GFP_KERNEL);
> + if (!npu)
> + return -ENOMEM;
>
> if (!npu2_devices.atsd_threshold_dentry) {
> npu2_devices.atsd_threshold_dentry = debugfs_create_x64(
> @@ -974,8 +1005,7 @@ int pnv_npu2_init(struct pnv_phb *phb)
> &npu2_devices.atsd_threshold);
> }
>
> - phb->npu.nmmu_flush =
> - of_property_read_bool(phb->hose->dn, "ibm,nmmu-flush");
> + npu->nmmu_flush = of_property_read_bool(hose->dn, "ibm,nmmu-flush");
> for_each_child_of_node(phb->hose->dn, dn) {
> gpdev = pnv_pci_get_gpu_dev(get_pci_dev(dn));
> if (gpdev) {
> @@ -989,18 +1019,31 @@ int pnv_npu2_init(struct pnv_phb *phb)
> }
> }
>
> - for (i = 0; !of_property_read_u64_index(phb->hose->dn, "ibm,mmio-atsd",
> + for (i = 0; !of_property_read_u64_index(hose->dn, "ibm,mmio-atsd",
> i, &mmio_atsd); i++)
> - phb->npu.mmio_atsd_regs[i] = ioremap(mmio_atsd, 32);
> + npu->mmio_atsd_regs[i] = ioremap(mmio_atsd, 32);
>
> - pr_info("NPU%lld: Found %d MMIO ATSD registers", phb->opal_id, i);
> - phb->npu.mmio_atsd_count = i;
> - phb->npu.mmio_atsd_usage = 0;
> + pr_info("NPU%d: Found %d MMIO ATSD registers", hose->global_number, i);
> + npu->mmio_atsd_count = i;
> + npu->mmio_atsd_usage = 0;
> npu_index++;
> - if (WARN_ON(npu_index >= NV_MAX_NPUS))
> - return -ENOSPC;
> + if (WARN_ON(npu_index >= NV_MAX_NPUS)) {
> + ret = -ENOSPC;
> + goto fail_exit;
> + }
> npu2_devices.max_index = npu_index;
> - phb->npu.index = npu_index;
> + npu->index = npu_index;
> + npu->hose = hose;
> +
> + list_add(&npu->next, &npu2_devices.npu_list);
>
> return 0;
> +
> +fail_exit:
> + for (i = 0; i < npu->mmio_atsd_count; ++i)
> + iounmap(npu->mmio_atsd_regs[i]);
> +
> + kfree(npu);
> +
> + return ret;
> }
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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