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Date: Thu, 27 Feb 2014 09:55:37 -0500
From: Boris Ostrovsky <boris.ostrovsky@...cle.com>
To: Roger Pau Monne <roger.pau@...rix.com>
CC: xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen: add support for MSI message groups
On 02/26/2014 11:24 AM, Roger Pau Monne wrote:
> Add support for MSI message groups for Xen Dom0 using the
> MAP_PIRQ_TYPE_MULTI_MSI pirq map type.
>
> In order to keep track of which pirq is the first one in the group all
> pirqs in the MSI group except for the first one have the newly
> introduced PIRQ_MSI_GROUP flag set. This prevents calling
> PHYSDEVOP_unmap_pirq on them, since the unmap must be done with the
> first pirq in the group.
>
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> ---
> Tested with an Intel ICH8 AHCI SATA controller.
> ---
> arch/x86/pci/xen.c | 29 ++++++++++++++------
> drivers/xen/events/events_base.c | 47 +++++++++++++++++++++++-----------
> drivers/xen/events/events_internal.h | 1 +
> include/xen/events.h | 2 +-
> include/xen/interface/physdev.h | 1 +
> 5 files changed, 55 insertions(+), 25 deletions(-)
>
> diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
> index 103e702..905956f 100644
> --- a/arch/x86/pci/xen.c
> +++ b/arch/x86/pci/xen.c
> @@ -178,6 +178,7 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> i = 0;
> list_for_each_entry(msidesc, &dev->msi_list, list) {
> irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
> + (type == PCI_CAP_ID_MSI) ? nvec : 1,
> (type == PCI_CAP_ID_MSIX) ?
> "pcifront-msi-x" :
> "pcifront-msi",
> @@ -245,6 +246,7 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> "xen: msi already bound to pirq=%d\n", pirq);
> }
> irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
> + (type == PCI_CAP_ID_MSI) ? nvec : 1,
> (type == PCI_CAP_ID_MSIX) ?
> "msi-x" : "msi",
> DOMID_SELF);
> @@ -269,9 +271,6 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> int ret = 0;
> struct msi_desc *msidesc;
>
> - if (type == PCI_CAP_ID_MSI && nvec > 1)
> - return 1;
> -
> list_for_each_entry(msidesc, &dev->msi_list, list) {
> struct physdev_map_pirq map_irq;
> domid_t domid;
> @@ -291,7 +290,10 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> (pci_domain_nr(dev->bus) << 16);
> map_irq.devfn = dev->devfn;
>
> - if (type == PCI_CAP_ID_MSIX) {
> + if (type == PCI_CAP_ID_MSI && nvec > 1) {
> + map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
> + map_irq.entry_nr = nvec;
Are we overloading entry_nr here with a different meaning? I thought it
was meant to be entry number (in MSI-X table for example), not number of
entries.
> + } else if (type == PCI_CAP_ID_MSIX) {
> int pos;
> u32 table_offset, bir;
>
> @@ -308,6 +310,16 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> if (pci_seg_supported)
> ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
> &map_irq);
> + if (type == PCI_CAP_ID_MSI && nvec > 1 && ret) {
> + /*
> + * If MAP_PIRQ_TYPE_MULTI_MSI is not available
> + * there's nothing else we can do in this case.
> + * Just set ret > 0 so driver can retry with
> + * single MSI.
> + */
> + ret = 1;
> + goto out;
> + }
> if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
> map_irq.type = MAP_PIRQ_TYPE_MSI;
> map_irq.index = -1;
> @@ -324,11 +336,10 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> goto out;
> }
>
> - ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
> - map_irq.pirq,
> - (type == PCI_CAP_ID_MSIX) ?
> - "msi-x" : "msi",
> - domid);
> + ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
> + (type == PCI_CAP_ID_MSI) ? nvec : 1,
> + (type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
> + domid);
> if (ret < 0)
> goto out;
> }
> diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
> index f4a9e33..ff20ae2 100644
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -391,10 +391,10 @@ static void xen_irq_init(unsigned irq)
> list_add_tail(&info->list, &xen_irq_list_head);
> }
>
> -static int __must_check xen_allocate_irq_dynamic(void)
> +static int __must_check xen_allocate_irqs_dynamic(int nvec)
> {
> int first = 0;
> - int irq;
> + int i, irq;
>
> #ifdef CONFIG_X86_IO_APIC
> /*
> @@ -408,14 +408,22 @@ static int __must_check xen_allocate_irq_dynamic(void)
> first = get_nr_irqs_gsi();
> #endif
>
> - irq = irq_alloc_desc_from(first, -1);
> + irq = irq_alloc_descs_from(first, nvec, -1);
>
> - if (irq >= 0)
> - xen_irq_init(irq);
> + if (irq >= 0) {
> + for (i = 0; i < nvec; i++)
> + xen_irq_init(irq + i);
> + }
>
> return irq;
> }
>
> +static inline int __must_check xen_allocate_irq_dynamic(void)
> +{
> +
> + return xen_allocate_irqs_dynamic(1);
> +}
> +
> static int __must_check xen_allocate_irq_gsi(unsigned gsi)
> {
> int irq;
> @@ -741,22 +749,25 @@ int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc)
> }
>
> int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
> - int pirq, const char *name, domid_t domid)
> + int pirq, int nvec, const char *name, domid_t domid)
> {
> - int irq, ret;
> + int i, irq, ret;
>
> mutex_lock(&irq_mapping_update_lock);
>
> - irq = xen_allocate_irq_dynamic();
> + irq = xen_allocate_irqs_dynamic(nvec);
> if (irq < 0)
> goto out;
>
> - irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
> - name);
> + for (i = 0; i < nvec; i++) {
> + irq_set_chip_and_handler_name(irq + i, &xen_pirq_chip, handle_edge_irq, name);
> +
> + ret = xen_irq_info_pirq_setup(irq + i, 0, pirq + i, 0, domid,
> + i == 0 ? 0 : PIRQ_MSI_GROUP);
> + if (ret < 0)
> + goto error_irq;
> + }
>
> - ret = xen_irq_info_pirq_setup(irq, 0, pirq, 0, domid, 0);
> - if (ret < 0)
> - goto error_irq;
> ret = irq_set_msi_desc(irq, msidesc);
> if (ret < 0)
> goto error_irq;
> @@ -764,7 +775,8 @@ out:
> mutex_unlock(&irq_mapping_update_lock);
> return irq;
> error_irq:
> - __unbind_from_irq(irq);
> + for (; i >= 0; i--)
> + __unbind_from_irq(irq + i);
> mutex_unlock(&irq_mapping_update_lock);
> return ret;
> }
> @@ -783,7 +795,12 @@ int xen_destroy_irq(int irq)
> if (!desc)
> goto out;
>
> - if (xen_initial_domain()) {
> + /*
> + * If trying to remove a vector in a MSI group different
> + * than the first one skip the PIRQ unmap unless this vector
> + * is the first one in the group.
> + */
> + if (xen_initial_domain() && !(info->u.pirq.flags & PIRQ_MSI_GROUP)) {
> unmap_irq.pirq = info->u.pirq.pirq;
> unmap_irq.domid = info->u.pirq.domid;
> rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
> diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h
> index 677f41a..50c2050a 100644
> --- a/drivers/xen/events/events_internal.h
> +++ b/drivers/xen/events/events_internal.h
> @@ -53,6 +53,7 @@ struct irq_info {
>
> #define PIRQ_NEEDS_EOI (1 << 0)
> #define PIRQ_SHAREABLE (1 << 1)
> +#define PIRQ_MSI_GROUP (1 << 2)
>
> struct evtchn_ops {
> unsigned (*max_channels)(void);
> diff --git a/include/xen/events.h b/include/xen/events.h
> index c9c85cf..2ae7e03 100644
> --- a/include/xen/events.h
> +++ b/include/xen/events.h
> @@ -102,7 +102,7 @@ int xen_bind_pirq_gsi_to_irq(unsigned gsi,
> int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
> /* Bind an PSI pirq to an irq. */
> int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
> - int pirq, const char *name, domid_t domid);
> + int pirq, int nvec, const char *name, domid_t domid);
> #endif
>
> /* De-allocates the above mentioned physical interrupt. */
> diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
> index 42721d1..eb13326d 100644
> --- a/include/xen/interface/physdev.h
> +++ b/include/xen/interface/physdev.h
> @@ -131,6 +131,7 @@ struct physdev_irq {
> #define MAP_PIRQ_TYPE_GSI 0x1
> #define MAP_PIRQ_TYPE_UNKNOWN 0x2
> #define MAP_PIRQ_TYPE_MSI_SEG 0x3
> +#define MAP_PIRQ_TYPE_MULTI_MSI 0x4
Formatting.
-boris
>
> #define PHYSDEVOP_map_pirq 13
> struct physdev_map_pirq {
--
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