RE: [PATCH v9 01/13] KVM: PPC: POWERNV: move iommu_add_device earlier
Hi Alex, Looks like this patch is not picked by anyone, Are you going to pick this patch? My vfio/iommu patches have dependency on this patch (this is already tested by me). Thanks -Bharat -Original Message- From: Linuxppc-dev [mailto:linuxppc-dev- bounces+bharat.bhushan=freescale@lists.ozlabs.org] On Behalf Of Alexey Kardashevskiy Sent: Wednesday, August 28, 2013 2:08 PM To: linuxppc-dev@lists.ozlabs.org Cc: k...@vger.kernel.org; Gleb Natapov; Alexey Kardashevskiy; Alexander Graf; kvm-...@vger.kernel.org; linux-ker...@vger.kernel.org; linux...@kvack.org; Paul Mackerras; Paolo Bonzini; David Gibson Subject: [PATCH v9 01/13] KVM: 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 a...@ozlabs.ru --- Changes: v8: * added the check for iommu_group!=NULL before removing device from a group as suggested by Wei Yang weiy...@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| 9 +++ arch/powerpc/kernel/iommu.c | 41 +++-- arch/powerpc/platforms/powernv/pci-ioda.c | 8 +++--- arch/powerpc/platforms/powernv/pci-p5ioc2.c | 2 +- arch/powerpc/platforms/powernv/pci.c| 33 ++- arch/powerpc/platforms/pseries/iommu.c | 8 +++--- 6 files changed, 55 insertions(+), 46 deletions(-) diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index c34656a..19ad77f 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -103,6 +103,15 @@ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, int nid); 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); + +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 b20ff17..15f8ca8 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; @@ -1134,46 +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); } - -static int 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: - iommu_del_device(dev); - return 0; - default: - return 0; - } -} - -static struct notifier_block tce_iommu_bus_nb = { - .notifier_call = iommu_bus_notifier, -}; - -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; -} - -subsys_initcall_sync(tce_iommu_init); +EXPORT_SYMBOL_GPL(iommu_del_device
[PATCH v9 01/13] KVM: 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 a...@ozlabs.ru --- Changes: v8: * added the check for iommu_group!=NULL before removing device from a group as suggested by Wei Yang weiy...@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| 9 +++ arch/powerpc/kernel/iommu.c | 41 +++-- arch/powerpc/platforms/powernv/pci-ioda.c | 8 +++--- arch/powerpc/platforms/powernv/pci-p5ioc2.c | 2 +- arch/powerpc/platforms/powernv/pci.c| 33 ++- arch/powerpc/platforms/pseries/iommu.c | 8 +++--- 6 files changed, 55 insertions(+), 46 deletions(-) diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index c34656a..19ad77f 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -103,6 +103,15 @@ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, int nid); 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); + +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 b20ff17..15f8ca8 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; @@ -1134,46 +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); } - -static int 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: - iommu_del_device(dev); - return 0; - default: - return 0; - } -} - -static struct notifier_block tce_iommu_bus_nb = { - .notifier_call = iommu_bus_notifier, -}; - -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; -} - -subsys_initcall_sync(tce_iommu_init); +EXPORT_SYMBOL_GPL(iommu_del_device); #else diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index d8140b1..756bb58 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -440,7 +440,7 @@ 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) @@ -448,7 +448,7 @@ 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,