linux-kernel - Re: [PATCH v4 1/2] PCI: Add tango MSI controller support

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Date:   Wed, 31 May 2017 23:55:37 +0200
From:   Mason <slash.tmp@...e.fr>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Liviu Dudau <liviu.dudau@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Laight <david.laight@...lab.com>,
        Robin Murphy <robin.murphy@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>
Subject: Re: [PATCH v4 1/2] PCI: Add tango MSI controller support

On 31/05/2017 22:04, Bjorn Helgaas wrote:

> Cscope only sees 94 definitions of irq_set_affinity.  I know *I* could
> never write a script faster than looking at them manually.

for F in $(find -name '*.c'); do
  if grep -q pci_msi_create_irq_domain $F; then
    grep 'irq_set_affinity\s*=' $F | cut -f2 -d= | tr -d ',;' | while read CALLBACK
    do
      Y=$(grep -A4 "$CALLBACK(struct" $F)
      echo $Y | grep static
    done
  fi
done

static int ls_scfg_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; }
static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; }
static int armada_xp_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force) { irq_hw_number_t hwirq = irqd_to_hwirq(d);
static int nwl_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; }
static int hv_set_affinity(struct irq_data *data, const struct cpumask *dest, bool force) { struct irq_data *parent = data->parent_data;
static int xgene_msi_set_affinity(struct irq_data *irqdata, const struct cpumask *mask, bool force) { int target_cpu = cpumask_first(mask); int curr_cpu;
static int vmd_irq_set_affinity(struct irq_data *data, const struct cpumask *dest, bool force) { return -EINVAL; }
static int altera_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; }
static int advk_msi_set_affinity(struct irq_data *irq_data, const struct cpumask *mask, bool force) { return -EINVAL; }
static int iproc_msi_irq_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { struct iproc_msi *msi = irq_data_get_irq_chip_data(data);

> While doing that, I noticed irq_chip_set_affinity_parent(), which is
> used in 14 cases and appears similar to your patch.

Indeed. I suppose msi_domain_set_affinity() could look like below,
if we don't mind changing EINVAL to ENOSYS. What do you think?

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index ddc2f5427f75..d37d2ba790df 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -87,11 +87,10 @@ static inline void irq_chip_write_msi_msg(struct irq_data *data,
 int msi_domain_set_affinity(struct irq_data *irq_data,
                            const struct cpumask *mask, bool force)
 {
-       struct irq_data *parent = irq_data->parent_data;
        struct msi_msg msg;
        int ret;
 
-       ret = parent->chip->irq_set_affinity(parent, mask, force);
+       ret = irq_chip_set_affinity_parent(irq_data, mask, force);
        if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
                BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
                irq_chip_write_msi_msg(irq_data, &msg);