From 1fe038d34e28b2e61927bf1f506ba2e12d9c8ccb Mon Sep 17 00:00:00 2001 From: Russell Currey Date: Mon, 9 Apr 2018 17:29:36 +1000 Subject: powerpc/powernv/pci: Track largest available TCE order per PHB Knowing the largest possible TCE size of a PHB is useful, so get it out of the device tree. This relies on the property being added in OPAL. It is assumed that any PHB4 or later machine would be running firmware that implemented this property, and otherwise assumed to be PHB3, which has a maximum TCE order of 28 bits or 256MB TCEs. This is used later in the series. Signed-off-by: Russell Currey --- arch/powerpc/platforms/powernv/pci-ioda.c | 16 ++++++++++++++++ arch/powerpc/platforms/powernv/pci.h | 3 +++ 2 files changed, 19 insertions(+) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 5bd0eb6..bcb3bfc 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -3873,11 +3873,13 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, struct resource r; const __be64 *prop64; const __be32 *prop32; + struct property *prop; int len; unsigned int segno; u64 phb_id; void *aux; long rc; + u32 val; if (!of_device_is_available(np)) return; @@ -4016,6 +4018,20 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, } phb->ioda.pe_array = aux + pemap_off; + phb->ioda.max_tce_order = 0; + // Get TCE order from the DT. If it's not present, assume P8 + if (!of_get_property(np, "ibm,supported-tce-sizes", NULL)) { + phb->ioda.max_tce_order = 28; // assume P8 256mb TCEs + } else { + of_property_for_each_u32(np, "ibm,supported-tce-sizes", prop, + prop32, val) { + if (val > phb->ioda.max_tce_order) + phb->ioda.max_tce_order = val; + } + pr_debug("PHB%llx Found max TCE order of %d bits\n", + phb->opal_id, phb->ioda.max_tce_order); + } + /* * Choose PE number for root bus, which shouldn't have * M64 resources consumed by its child devices. To pick diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h index eada4b6..c9952de 100644 --- a/arch/powerpc/platforms/powernv/pci.h +++ b/arch/powerpc/platforms/powernv/pci.h @@ -173,6 +173,9 @@ struct pnv_phb { struct list_head pe_list; struct mutex pe_list_mutex; + /* Largest supported TCE order bits */ + uint8_t max_tce_order; + /* Reverse map of PEs, indexed by {bus, devfn} */ unsigned int pe_rmap[0x10000]; } ioda; -- cgit v1.1