[POWERPC] Add debugging trigger to Axon MSI code
This adds some debugging code to the Axon MSI driver. It creates a file per MSIC in /sys/kernel/debug/powerpc, which allows the user to trigger a fake MSI interrupt by writing to the file. This can be used to test some of the MSI generation path. In particular, that the MSIC recognises a write to the MSI address, generates an interrupt and writes the MSI packet into the ring buffer. All the code is inside #ifdef DEBUG so it causes no harm unless it's enabled. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -14,6 +14,7 @@
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <linux/of_platform.h>
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#include <linux/debugfs.h>
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#include <asm/dcr.h>
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#include <asm/machdep.h>
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@ -69,8 +70,19 @@ struct axon_msic {
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dma_addr_t fifo_phys;
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dcr_host_t dcr_host;
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u32 read_offset;
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#ifdef DEBUG
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u32 __iomem *trigger;
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#endif
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};
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#ifdef DEBUG
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void axon_msi_debug_setup(struct device_node *dn, struct axon_msic *msic);
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#else
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static inline void axon_msi_debug_setup(struct device_node *dn,
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struct axon_msic *msic) { }
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#endif
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static void msic_dcr_write(struct axon_msic *msic, unsigned int dcr_n, u32 val)
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{
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pr_debug("axon_msi: dcr_write(0x%x, 0x%x)\n", val, dcr_n);
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@ -381,6 +393,8 @@ static int axon_msi_probe(struct of_device *device,
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ppc_md.teardown_msi_irqs = axon_msi_teardown_msi_irqs;
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ppc_md.msi_check_device = axon_msi_check_device;
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axon_msi_debug_setup(dn, msic);
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printk(KERN_DEBUG "axon_msi: setup MSIC on %s\n", dn->full_name);
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return 0;
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@ -418,3 +432,47 @@ static int __init axon_msi_init(void)
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return of_register_platform_driver(&axon_msi_driver);
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}
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subsys_initcall(axon_msi_init);
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#ifdef DEBUG
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static int msic_set(void *data, u64 val)
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{
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struct axon_msic *msic = data;
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out_le32(msic->trigger, val);
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return 0;
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}
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static int msic_get(void *data, u64 *val)
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{
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*val = 0;
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(fops_msic, msic_get, msic_set, "%llu\n");
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void axon_msi_debug_setup(struct device_node *dn, struct axon_msic *msic)
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{
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char name[8];
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u64 addr;
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addr = of_translate_address(dn, of_get_property(dn, "reg", NULL));
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if (addr == OF_BAD_ADDR) {
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pr_debug("axon_msi: couldn't translate reg property\n");
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return;
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}
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msic->trigger = ioremap(addr, 0x4);
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if (!msic->trigger) {
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pr_debug("axon_msi: ioremap failed\n");
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return;
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}
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snprintf(name, sizeof(name), "msic_%d", of_node_to_nid(dn));
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if (!debugfs_create_file(name, 0600, powerpc_debugfs_root,
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msic, &fops_msic)) {
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pr_debug("axon_msi: debugfs_create_file failed!\n");
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return;
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}
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}
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#endif /* DEBUG */
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