[PATCH v11] PPC: POWERNV: move iommu_add_device earlier
Bharat.Bhushan at freescale.com
Bharat.Bhushan at freescale.com
Sat Dec 14 15:57:27 EST 2013
> -----Original Message-----
> From: Alexey Kardashevskiy [mailto:aik at ozlabs.ru]
> Sent: Thursday, December 12, 2013 1:24 PM
> To: linuxppc-dev at lists.ozlabs.org
> Cc: Alexey Kardashevskiy; Benjamin Herrenschmidt; Bhushan Bharat-R65777; Alex
> Graf; linux-kernel at vger.kernel.org
> Subject: [PATCH v11] PPC: POWERNV: move iommu_add_device earlier
>
> The current implementation of IOMMU on sPAPR does not use iommu_ops
> and therefore does not call IOMMU API's bus_set_iommu() which
> 1) sets iommu_ops for a bus
> 2) registers a bus notifier
> Instead, PCI devices are added to IOMMU groups from
> subsys_initcall_sync(tce_iommu_init) which does basically the same
> thing without using iommu_ops callbacks.
>
> However Freescale PAMU driver (https://lkml.org/lkml/2013/7/1/158)
> implements iommu_ops and when tce_iommu_init is called, every PCI device
> is already added to some group so there is a conflict.
>
> This patch does 2 things:
> 1. removes the loop in which PCI devices were added to groups and
> adds explicit iommu_add_device() calls to add devices as soon as they get
> the iommu_table pointer assigned to them.
> 2. moves a bus notifier to powernv code in order to avoid conflict with
> the notifier from Freescale driver.
>
> iommu_add_device() and iommu_del_device() are public now.
>
> Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
> ---
> Changes:
> v11:
> * rebased on upstream
>
> v10:
> * fixed linker error when IOMMU_API is not enabled
>
> v9:
> * removed "KVM" from the subject as it is not really a KVM patch so
> PPC mainainter (hi Ben!) can review/include it into his tree
>
> v8:
> * added the check for iommu_group!=NULL before removing device from a group
> as suggested by Wei Yang <weiyang at linux.vnet.ibm.com>
>
> v2:
> * added a helper - set_iommu_table_base_and_group - which does
> set_iommu_table_base() and iommu_add_device()
> ---
> arch/powerpc/include/asm/iommu.h | 26 ++++++++++++++++++++++++
> arch/powerpc/kernel/iommu.c | 11 ++++------
> arch/powerpc/platforms/powernv/pci-ioda.c | 8 ++++----
> arch/powerpc/platforms/powernv/pci-p5ioc2.c | 2 +-
> arch/powerpc/platforms/powernv/pci.c | 31 ++++++++++++++++++++++++++++-
> arch/powerpc/platforms/pseries/iommu.c | 8 +++++---
> 6 files changed, 70 insertions(+), 16 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
> index c34656a..774fa27 100644
> --- a/arch/powerpc/include/asm/iommu.h
> +++ b/arch/powerpc/include/asm/iommu.h
> @@ -101,8 +101,34 @@ extern void iommu_free_table(struct iommu_table *tbl, const
> char *node_name);
> */
> extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
> int nid);
> +#ifdef CONFIG_IOMMU_API
> extern void iommu_register_group(struct iommu_table *tbl,
> int pci_domain_number, unsigned long pe_num);
> +extern int iommu_add_device(struct device *dev);
> +extern void iommu_del_device(struct device *dev);
> +#else
> +static inline void iommu_register_group(struct iommu_table *tbl,
> + int pci_domain_number,
> + unsigned long pe_num)
> +{
> +}
> +
> +static inline int iommu_add_device(struct device *dev)
> +{
> + return 0;
> +}
> +
> +static inline void iommu_del_device(struct device *dev)
> +{
> +}
> +#endif /* !CONFIG_IOMMU_API */
> +
> +static inline void set_iommu_table_base_and_group(struct device *dev,
> + void *base)
> +{
> + set_iommu_table_base(dev, base);
> + iommu_add_device(dev);
> +}
>
> extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
> struct scatterlist *sglist, int nelems,
> diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
> index 572bb5b..818a092 100644
> --- a/arch/powerpc/kernel/iommu.c
> +++ b/arch/powerpc/kernel/iommu.c
> @@ -1105,7 +1105,7 @@ void iommu_release_ownership(struct iommu_table *tbl)
> }
> EXPORT_SYMBOL_GPL(iommu_release_ownership);
>
> -static int iommu_add_device(struct device *dev)
> +int iommu_add_device(struct device *dev)
> {
> struct iommu_table *tbl;
> int ret = 0;
> @@ -1134,11 +1134,13 @@ static int iommu_add_device(struct device *dev)
>
> return ret;
> }
> +EXPORT_SYMBOL_GPL(iommu_add_device);
>
> -static void iommu_del_device(struct device *dev)
> +void iommu_del_device(struct device *dev)
> {
> iommu_group_remove_device(dev);
> }
> +EXPORT_SYMBOL_GPL(iommu_del_device);
>
> static int iommu_bus_notifier(struct notifier_block *nb,
> unsigned long action, void *data)
> @@ -1162,13 +1164,8 @@ static struct notifier_block tce_iommu_bus_nb = {
>
> static int __init tce_iommu_init(void)
> {
> - struct pci_dev *pdev = NULL;
> -
> BUILD_BUG_ON(PAGE_SIZE < IOMMU_PAGE_SIZE);
>
> - for_each_pci_dev(pdev)
> - iommu_add_device(&pdev->dev);
> -
> bus_register_notifier(&pci_bus_type, &tce_iommu_bus_nb);
> return 0;
> }
Do we need this bus notifier? We are doing a bus notifier later ....
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c
> b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 2c6d173..f0e6871 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -460,7 +460,7 @@ static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb,
> struct pci_dev *pdev
> return;
>
> pe = &phb->ioda.pe_array[pdn->pe_number];
> - set_iommu_table_base(&pdev->dev, &pe->tce32_table);
> + set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
> }
>
> static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
> @@ -468,7 +468,7 @@ static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
> struct pci_bus *bus)
> struct pci_dev *dev;
>
> list_for_each_entry(dev, &bus->devices, bus_list) {
> - set_iommu_table_base(&dev->dev, &pe->tce32_table);
> + set_iommu_table_base_and_group(&dev->dev, &pe->tce32_table);
> if (dev->subordinate)
> pnv_ioda_setup_bus_dma(pe, dev->subordinate);
> }
> @@ -644,7 +644,7 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
> iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
>
> if (pe->pdev)
> - set_iommu_table_base(&pe->pdev->dev, tbl);
> + set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
> else
> pnv_ioda_setup_bus_dma(pe, pe->pbus);
>
> @@ -723,7 +723,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
> iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
>
> if (pe->pdev)
> - set_iommu_table_base(&pe->pdev->dev, tbl);
> + set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
> else
> pnv_ioda_setup_bus_dma(pe, pe->pbus);
>
> diff --git a/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> index f8b4bd8..e3807d6 100644
> --- a/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> +++ b/arch/powerpc/platforms/powernv/pci-p5ioc2.c
> @@ -92,7 +92,7 @@ static void pnv_pci_p5ioc2_dma_dev_setup(struct pnv_phb *phb,
> pci_domain_nr(phb->hose->bus), phb->opal_id);
> }
>
> - set_iommu_table_base(&pdev->dev, &phb->p5ioc2.iommu_table);
> + set_iommu_table_base_and_group(&pdev->dev, &phb->p5ioc2.iommu_table);
> }
>
> static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np, u64 hub_id,
> diff --git a/arch/powerpc/platforms/powernv/pci.c
> b/arch/powerpc/platforms/powernv/pci.c
> index 4eb33a9..a78abad 100644
> --- a/arch/powerpc/platforms/powernv/pci.c
> +++ b/arch/powerpc/platforms/powernv/pci.c
> @@ -536,7 +536,7 @@ static void pnv_pci_dma_fallback_setup(struct pci_controller
> *hose,
> pdn->iommu_table = pnv_pci_setup_bml_iommu(hose);
> if (!pdn->iommu_table)
> return;
> - set_iommu_table_base(&pdev->dev, pdn->iommu_table);
> + set_iommu_table_base_and_group(&pdev->dev, pdn->iommu_table);
> }
>
> static void pnv_pci_dma_dev_setup(struct pci_dev *pdev)
> @@ -657,3 +657,32 @@ void __init pnv_pci_init(void)
> ppc_md.teardown_msi_irqs = pnv_teardown_msi_irqs;
> #endif
> }
> +
> +static int tce_iommu_bus_notifier(struct notifier_block *nb,
> + unsigned long action, void *data)
> +{
> + struct device *dev = data;
> +
> + switch (action) {
> + case BUS_NOTIFY_ADD_DEVICE:
> + return iommu_add_device(dev);
> + case BUS_NOTIFY_DEL_DEVICE:
> + if (dev->iommu_group)
> + iommu_del_device(dev);
> + return 0;
> + default:
> + return 0;
> + }
> +}
> +
> +static struct notifier_block tce_iommu_bus_nb = {
> + .notifier_call = tce_iommu_bus_notifier,
> +};
> +
> +static int __init tce_iommu_bus_notifier_init(void)
> +{
> + bus_register_notifier(&pci_bus_type, &tce_iommu_bus_nb);
Here it is, setting up the bus notifier.
Thanks
-Bharat
> + return 0;
> +}
> +
> +subsys_initcall_sync(tce_iommu_bus_notifier_init);
> diff --git a/arch/powerpc/platforms/pseries/iommu.c
> b/arch/powerpc/platforms/pseries/iommu.c
> index f253361..a80af6c 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -687,7 +687,8 @@ static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
> iommu_table_setparms(phb, dn, tbl);
> PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node);
> iommu_register_group(tbl, pci_domain_nr(phb->bus), 0);
> - set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
> + set_iommu_table_base_and_group(&dev->dev,
> + PCI_DN(dn)->iommu_table);
> return;
> }
>
> @@ -699,7 +700,8 @@ static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
> dn = dn->parent;
>
> if (dn && PCI_DN(dn))
> - set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
> + set_iommu_table_base_and_group(&dev->dev,
> + PCI_DN(dn)->iommu_table);
> else
> printk(KERN_WARNING "iommu: Device %s has no iommu table\n",
> pci_name(dev));
> @@ -1193,7 +1195,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev
> *dev)
> pr_debug(" found DMA window, table: %p\n", pci->iommu_table);
> }
>
> - set_iommu_table_base(&dev->dev, pci->iommu_table);
> + set_iommu_table_base_and_group(&dev->dev, pci->iommu_table);
> }
>
> static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
> --
> 1.8.4.rc4
>
>
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