debug lk

hc

2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077

 kernel/drivers/xen/xen-pciback/conf_space_capability.c
..
..
@@ -189,6 +189,88 @@
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 	{}
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 };
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191
 
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+static struct msi_msix_field_config {
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+	u16          enable_bit;   /* bit for enabling MSI/MSI-X */
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+	u16          allowed_bits; /* bits allowed to be changed */
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+	unsigned int int_type;     /* interrupt type for exclusiveness check */
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+} msi_field_config = {
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+	.enable_bit	= PCI_MSI_FLAGS_ENABLE,
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+	.allowed_bits	= PCI_MSI_FLAGS_ENABLE,
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+	.int_type	= INTERRUPT_TYPE_MSI,
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+}, msix_field_config = {
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+	.enable_bit	= PCI_MSIX_FLAGS_ENABLE,
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+	.allowed_bits	= PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL,
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+	.int_type	= INTERRUPT_TYPE_MSIX,
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+};
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+
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+static void *msi_field_init(struct pci_dev *dev, int offset)
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+{
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+	return &msi_field_config;
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+}
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+
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+static void *msix_field_init(struct pci_dev *dev, int offset)
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+{
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+	return &msix_field_config;
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+}
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+
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+static int msi_msix_flags_write(struct pci_dev *dev, int offset, u16 new_value,
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+				void *data)
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+{
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+	int err;
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+	u16 old_value;
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+	const struct msi_msix_field_config *field_config = data;
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+	const struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
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+
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+	if (xen_pcibk_permissive || dev_data->permissive)
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+		goto write;
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+
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+	err = pci_read_config_word(dev, offset, &old_value);
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+	if (err)
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+		return err;
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+
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+	if (new_value == old_value)
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+		return 0;
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+
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+	if (!dev_data->allow_interrupt_control ||
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+	    (new_value ^ old_value) & ~field_config->allowed_bits)
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+		return PCIBIOS_SET_FAILED;
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+
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+	if (new_value & field_config->enable_bit) {
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+		/* don't allow enabling together with other interrupt types */
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+		int int_type = xen_pcibk_get_interrupt_type(dev);
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+
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+		if (int_type == INTERRUPT_TYPE_NONE ||
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+		    int_type == field_config->int_type)
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+			goto write;
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+		return PCIBIOS_SET_FAILED;
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+	}
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+
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+write:
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+	return pci_write_config_word(dev, offset, new_value);
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+}
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+
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+static const struct config_field caplist_msix[] = {
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+	{
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+		.offset    = PCI_MSIX_FLAGS,
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+		.size      = 2,
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+		.init      = msix_field_init,
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+		.u.w.read  = xen_pcibk_read_config_word,
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+		.u.w.write = msi_msix_flags_write,
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+	},
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+	{}
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+};
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+
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+static const struct config_field caplist_msi[] = {
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+	{
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+		.offset    = PCI_MSI_FLAGS,
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+		.size      = 2,
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+		.init      = msi_field_init,
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+		.u.w.read  = xen_pcibk_read_config_word,
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+		.u.w.write = msi_msix_flags_write,
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+	},
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+	{}
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+};
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+
192
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 static struct xen_pcibk_config_capability xen_pcibk_config_capability_pm = {
193
275
 	.capability = PCI_CAP_ID_PM,
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276
 	.fields = caplist_pm,
..
..
@@ -197,11 +279,21 @@
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 	.capability = PCI_CAP_ID_VPD,
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 	.fields = caplist_vpd,
199
281
 };
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+static struct xen_pcibk_config_capability xen_pcibk_config_capability_msi = {
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+	.capability = PCI_CAP_ID_MSI,
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+	.fields = caplist_msi,
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+};
286
+static struct xen_pcibk_config_capability xen_pcibk_config_capability_msix = {
287
+	.capability = PCI_CAP_ID_MSIX,
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+	.fields = caplist_msix,
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+};
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290
 
201
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 int xen_pcibk_config_capability_init(void)
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 {
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 	register_capability(&xen_pcibk_config_capability_vpd);
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294
 	register_capability(&xen_pcibk_config_capability_pm);
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+	register_capability(&xen_pcibk_config_capability_msi);
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+	register_capability(&xen_pcibk_config_capability_msix);
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297
 
206
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 	return 0;
207
299
 }