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Message-ID: <C5ECD7A89D1DC44195F34B25E172658D40ABB4@039-SN2MPN1-013.039d.mgd.msft.net>
Date: Sun, 17 Mar 2013 15:48:12 +0000
From: Sethi Varun-B16395 <B16395@...escale.com>
To: Kumar Gala <galak@...nel.crashing.org>
CC: "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Yoder Stuart-B08248 <B08248@...escale.com>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
Wood Scott-B07421 <B07421@...escale.com>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH 5/5 v9] iommu/fsl: Freescale PAMU driver and iommu
implementation.
> -----Original Message-----
> From: iommu-bounces@...ts.linux-foundation.org [mailto:iommu-
> bounces@...ts.linux-foundation.org] On Behalf Of Kumar Gala
> Sent: Friday, March 15, 2013 1:50 AM
> To: Sethi Varun-B16395
> Cc: benh@...nel.crashing.org; linux-kernel@...r.kernel.org; Yoder Stuart-
> B08248; iommu@...ts.linux-foundation.org; Wood Scott-B07421; linuxppc-
> dev@...ts.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
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