Messages in this thread | | | Subject | Re: [RFC PATCH 21/33] irqchip/gic-v3-its: Add VPE irq domain allocation/teardown | From | Shanker Donthineni <> | Date | Mon, 13 Feb 2017 17:25:43 -0600 |
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Hi Marc,
On 01/17/2017 04:20 AM, Marc Zyngier wrote: > When creating a VM, the low level GICv4 code is responsible for: > - allocating each VPE a unique VPEID > - allocating a doorbell interrupt for each VPE > - allocating the pending tables for each VPE > - allocating the property table for the VM > > This of course has to be reversed when the VM is brought down. > > All of this is wired into the irq domain alloc/free methods. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > --- > drivers/irqchip/irq-gic-v3-its.c | 174 > +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 174 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-v3-its.c > b/drivers/irqchip/irq-gic-v3-its.c > index ddd8096..54d0075 100644 > --- a/drivers/irqchip/irq-gic-v3-its.c > +++ b/drivers/irqchip/irq-gic-v3-its.c > @@ -139,6 +139,7 @@ static struct rdists *gic_rdists; > static struct irq_domain *its_parent; > > static unsigned long its_list_map; > +static DEFINE_IDA(its_vpeid_ida); > > #define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist)) > #define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base) > @@ -1146,6 +1147,11 @@ static struct page *its_allocate_prop_table(gfp_t > gfp_flags) > return prop_page; > } > > +static void its_free_prop_table(struct page *prop_page) > +{ > + free_pages((unsigned long)page_address(prop_page), > + get_order(LPI_PROPBASE_SZ)); > +} > > static int __init its_alloc_lpi_tables(void) > { > @@ -1444,6 +1450,12 @@ static struct page > *its_allocate_pending_table(gfp_t gfp_flags) > return pend_page; > } > > +static void its_free_pending_table(struct page *pt) > +{ > + free_pages((unsigned long)page_address(pt), > + get_order(max(LPI_PENDBASE_SZ, SZ_64K))); > +} > + > static void its_cpu_init_lpis(void) > { > void __iomem *rbase = gic_data_rdist_rd_base(); > @@ -1666,6 +1678,34 @@ static bool its_alloc_device_table(struct its_node > *its, u32 dev_id) > return its_alloc_table_entry(baser, dev_id); > } > > +static bool its_alloc_vpe_table(u32 vpe_id) > +{ > + struct its_node *its; > + > + /* > + * Make sure the L2 tables are allocated on *all* v4 ITSs. We > + * could try and only do it on ITSs corresponding to devices > + * that have interrupts targeted at this VPE, but the > + * complexity becomes crazy (and you have tons of memory > + * anyway, right?). > + */ > + list_for_each_entry(its, &its_nodes, entry) { > + struct its_baser *baser; > + > + if (!its->is_v4) > + continue; > + > + baser = its_get_baser(its, GITS_BASER_TYPE_VCPU); > + if (!baser) > + return false; > + > + if (!its_alloc_table_entry(baser, vpe_id)) > + return false; > + } > + > + return true; > +} > + > static struct its_device *its_create_device(struct its_node *its, u32 > dev_id, > int nvecs) > { > @@ -1922,7 +1962,141 @@ static struct irq_chip its_vpe_irq_chip = { > .name = "GICv4-vpe", > }; > > +static int its_vpe_id_alloc(void) > +{ > + return ida_simple_get(&its_vpeid_ida, 0, 1 << 16, GFP_KERNEL); > +} > + > +static void its_vpe_id_free(u16 id) > +{ > + ida_simple_remove(&its_vpeid_ida, id); > +} > + > +static int its_vpe_init(struct its_vpe *vpe) > +{ > + struct page *vpt_page; > + int vpe_id; > + > + /* Allocate vpe_id */ > + vpe_id = its_vpe_id_alloc(); > + if (vpe_id < 0) > + return vpe_id; > + > + /* Allocate VPT */ > + vpt_page = its_allocate_pending_table(GFP_KERNEL); > + if (vpt_page) {
Change to 'if (!vpt_page)'.
-- Shanker Donthineni Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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