> -----Original Message----- > From: iommu-boun...@lists.linux-foundation.org [mailto:iommu- > boun...@lists.linux-foundation.org] On Behalf Of Kumar Gala > Sent: Friday, March 15, 2013 1:50 AM > To: Sethi Varun-B16395 > Cc: b...@kernel.crashing.org; linux-kernel@vger.kernel.org; Yoder Stuart- > B08248; io...@lists.linux-foundation.org; Wood Scott-B07421; linuxppc- > d...@lists.ozlabs.org > Subject: Re: [PATCH 5/5 v9] iommu/fsl: Freescale PAMU driver and iommu > implementation. > > > On Mar 13, 2013, at 1:49 PM, Varun Sethi wrote: > > > +/* > > + * Table of SVRs and the corresponding PORT_ID values. > > + * > > + * All future CoreNet-enabled SOCs will have this erratum fixed, so > > +this table > > + * should never need to be updated. SVRs are guaranteed to be > > +unique, so > > + * there is no worry that a future SOC will inadvertently have one of > > +these > > + * values. > > + */ > > Maybe add to the comment about what port_id represents > [Sethi Varun-B16395] ok. > > +static const struct { > > + u32 svr; > > + u32 port_id; > > +} port_id_map[] = { > > + {0x82100010, 0xFF000000}, /* P2040 1.0 */ > > + {0x82100011, 0xFF000000}, /* P2040 1.1 */ > > + {0x82100110, 0xFF000000}, /* P2041 1.0 */ > > + {0x82100111, 0xFF000000}, /* P2041 1.1 */ > > + {0x82110310, 0xFF000000}, /* P3041 1.0 */ > > + {0x82110311, 0xFF000000}, /* P3041 1.1 */ > > + {0x82010020, 0xFFF80000}, /* P4040 2.0 */ > > + {0x82000020, 0xFFF80000}, /* P4080 2.0 */ > > + {0x82210010, 0xFC000000}, /* P5010 1.0 */ > > + {0x82210020, 0xFC000000}, /* P5010 2.0 */ > > + {0x82200010, 0xFC000000}, /* P5020 1.0 */ > > + {0x82050010, 0xFF800000}, /* P5021 1.0 */ > > + {0x82040010, 0xFF800000}, /* P5040 1.0 */ > > +}; > > + > > +#define SVR_SECURITY 0x80000 /* The Security (E) bit */ > > + > > +static int __init fsl_pamu_probe(struct platform_device *pdev) { > > + void __iomem *pamu_regs = NULL; > > + struct ccsr_guts __iomem *guts_regs = NULL; > > + u32 pamubypenr, pamu_counter; > > + unsigned long pamu_reg_off; > > + unsigned long pamu_reg_base; > > + struct pamu_isr_data *data; > > + struct device_node *guts_node; > > + u64 size; > > + struct page *p; > > + int ret = 0; > > + int irq; > > + phys_addr_t ppaact_phys; > > + phys_addr_t spaact_phys; > > + phys_addr_t omt_phys; > > + size_t mem_size = 0; > > + unsigned int order = 0; > > + u32 csd_port_id = 0; > > + unsigned i; > > + /* > > + * enumerate all PAMUs and allocate and setup PAMU tables > > + * for each of them, > > + * NOTE : All PAMUs share the same LIODN tables. > > + */ > > + > > + pamu_regs = of_iomap(pdev->dev.of_node, 0); > > + if (!pamu_regs) { > > + dev_err(&pdev->dev, "ioremap of PAMU node failed\n"); > > + return -ENOMEM; > > + } > > + of_get_address(pdev->dev.of_node, 0, &size, NULL); > > + > > + irq = irq_of_parse_and_map(pdev->dev.of_node, 0); > > + if (irq == NO_IRQ) { > > + dev_warn(&pdev->dev, "no interrupts listed in PAMU node\n"); > > + goto error; > > + } > > + > > + data = kzalloc(sizeof(struct pamu_isr_data), GFP_KERNEL); > > + if (!data) { > > + iounmap(pamu_regs); > > + return -ENOMEM; > > + } > > + data->pamu_reg_base = pamu_regs; > > + data->count = size / PAMU_OFFSET; > > + > > + /* The ISR needs access to the regs, so we won't iounmap them */ > > + ret = request_irq(irq, pamu_av_isr, 0, "pamu", data); > > + if (ret < 0) { > > + dev_err(&pdev->dev, "error %i installing ISR for irq %i\n", > > + ret, irq); > > + goto error; > > + } > > + > > + guts_node = of_find_compatible_node(NULL, NULL, > > + "fsl,qoriq-device-config-1.0"); > > This doesn't work for T4 or B4 device trees. > [Sethi Varun-B16395]hmm.... I need to use the dcfg space for this.
> > + if (!guts_node) { > > + dev_err(&pdev->dev, "could not find GUTS node %s\n", > > + pdev->dev.of_node->full_name); > > + ret = -ENODEV; > > + goto error; > > + } > > + > > + guts_regs = of_iomap(guts_node, 0); > > + of_node_put(guts_node); > > + if (!guts_regs) { > > + dev_err(&pdev->dev, "ioremap of GUTS node failed\n"); > > + ret = -ENODEV; > > + goto error; > > + } > > + > > + /* read in the PAMU capability registers */ > > + get_pamu_cap_values((unsigned long)pamu_regs); > > + /* > > + * To simplify the allocation of a coherency domain, we allocate > the > > + * PAACT and the OMT in the same memory buffer. Unfortunately, > this > > + * wastes more memory compared to allocating the buffers > separately. > > + */ > > + /* Determine how much memory we need */ > > + mem_size = (PAGE_SIZE << get_order(PAACT_SIZE)) + > > + (PAGE_SIZE << get_order(SPAACT_SIZE)) + > > + (PAGE_SIZE << get_order(OMT_SIZE)); > > + order = get_order(mem_size); > > + > > + p = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); > > + if (!p) { > > + dev_err(&pdev->dev, "unable to allocate PAACT/SPAACT/OMT > block\n"); > > + ret = -ENOMEM; > > + goto error; > > + } > > + > > + ppaact = page_address(p); > > + ppaact_phys = page_to_phys(p); > > + > > + /* Make sure the memory is naturally aligned */ > > + if (ppaact_phys & ((PAGE_SIZE << order) - 1)) { > > + dev_err(&pdev->dev, "PAACT/OMT block is unaligned\n"); > > + ret = -ENOMEM; > > + goto error; > > + } > > + > > + spaact = (void *)ppaact + (PAGE_SIZE << get_order(PAACT_SIZE)); > > + omt = (void *)spaact + (PAGE_SIZE << get_order(SPAACT_SIZE)); > > + > > + dev_dbg(&pdev->dev, "ppaact virt=%p phys=0x%llx\n", ppaact, > > + (unsigned long long) ppaact_phys); > > + > > + /* Check to see if we need to implement the work-around on this SOC > > +*/ > > + > > + /* Determine the Port ID for our coherence subdomain */ > > + for (i = 0; i < ARRAY_SIZE(port_id_map); i++) { > > + if (port_id_map[i].svr == (mfspr(SPRN_SVR) & ~SVR_SECURITY)) > { > > + csd_port_id = port_id_map[i].port_id; > > + dev_dbg(&pdev->dev, "found matching SVR %08x\n", > > + port_id_map[i].svr); > > + break; > > + } > > + } > > + > > + if (csd_port_id) { > > + dev_dbg(&pdev->dev, "creating coherency subdomain at address > " > > + "0x%llx, size %zu, port id 0x%08x", ppaact_phys, > > + mem_size, csd_port_id); > > + > > + ret = create_csd(ppaact_phys, mem_size, csd_port_id); > > + if (ret) { > > + dev_err(&pdev->dev, "could not create coherence " > > + "subdomain\n"); > > + return ret; > > + } > > + } > > + > > + spaact_phys = virt_to_phys(spaact); > > + omt_phys = virt_to_phys(omt); > > + > > + spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1); > > + if (!spaace_pool) { > > + ret = -ENOMEM; > > + dev_err(&pdev->dev, "PAMU : failed to allocate spaace gen > pool\n"); > > + goto error; > > + } > > + > > + ret = gen_pool_add(spaace_pool, (unsigned long)spaact, SPAACT_SIZE, > -1); > > + if (ret) > > + goto error_genpool; > > + > > + pamubypenr = in_be32(&guts_regs->pamubypenr); > > + > > + for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < > size; > > + pamu_reg_off += PAMU_OFFSET, pamu_counter >>= 1) { > > + > > + pamu_reg_base = (unsigned long) pamu_regs + pamu_reg_off; > > + setup_one_pamu(pamu_reg_base, pamu_reg_off, ppaact_phys, > > + spaact_phys, omt_phys); > > + /* Disable PAMU bypass for this PAMU */ > > + pamubypenr &= ~pamu_counter; > > + } > > + > > + setup_omt(omt); > > + > > + /* Enable all relevant PAMU(s) */ > > + out_be32(&guts_regs->pamubypenr, pamubypenr); > > + > > + iounmap(guts_regs); > > + > > + /* Enable DMA for the LIODNs in the device tree*/ > > + > > + setup_liodns(); > > + > > + return 0; > > + > > +error_genpool: > > + gen_pool_destroy(spaace_pool); > > + > > +error: > > + if (irq != NO_IRQ) > > + free_irq(irq, 0); > > Should be: > > free_irq(irq, data); > [Sethi Varun-B16395] Yes. > > + > > + if (pamu_regs) > > + iounmap(pamu_regs); > > + > > + if (guts_regs) > > + iounmap(guts_regs); > > + > > + if (ppaact) > > + free_pages((unsigned long)ppaact, order); > > + > > + ppaact = NULL; > > + > > you alloc data, shouldn't you free it ? > [Sethi Varun-B16395] Yes. -Varun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/