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-rw-r--r--arch/powerpc/platforms/powernv/pci-cxl.c84
-rw-r--r--arch/powerpc/platforms/powernv/pci-ioda.c4
-rw-r--r--arch/powerpc/platforms/powernv/pci.h2
-rw-r--r--drivers/misc/cxl/api.c71
-rw-r--r--drivers/misc/cxl/base.c31
-rw-r--r--drivers/misc/cxl/cxl.h4
-rw-r--r--drivers/misc/cxl/main.c2
-rw-r--r--include/misc/cxl-base.h4
8 files changed, 202 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-cxl.c b/arch/powerpc/platforms/powernv/pci-cxl.c
index 831bbfb4e278..3f342077628b 100644
--- a/arch/powerpc/platforms/powernv/pci-cxl.c
+++ b/arch/powerpc/platforms/powernv/pci-cxl.c
@@ -8,6 +8,7 @@
*/
#include <linux/module.h>
+#include <linux/msi.h>
#include <asm/pci-bridge.h>
#include <asm/pnv-pci.h>
#include <asm/opal.h>
@@ -281,3 +282,86 @@ void pnv_cxl_disable_device(struct pci_dev *dev)
cxl_pci_disable_device(dev);
cxl_afu_put(afu);
}
+
+/*
+ * This is a special version of pnv_setup_msi_irqs for cards in cxl mode. This
+ * function handles setting up the IVTE entries for the XSL to use.
+ *
+ * We are currently not filling out the MSIX table, since the only currently
+ * supported adapter (CX4) uses a custom MSIX table format in cxl mode and it
+ * is up to their driver to fill that out. In the future we may fill out the
+ * MSIX table (and change the IVTE entries to be an index to the MSIX table)
+ * for adapters implementing the Full MSI-X mode described in the CAIA.
+ */
+int pnv_cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct pnv_phb *phb = hose->private_data;
+ struct msi_desc *entry;
+ struct cxl_context *ctx = NULL;
+ unsigned int virq;
+ int hwirq;
+ int afu_irq = 0;
+ int rc;
+
+ if (WARN_ON(!phb) || !phb->msi_bmp.bitmap)
+ return -ENODEV;
+
+ if (pdev->no_64bit_msi && !phb->msi32_support)
+ return -ENODEV;
+
+ rc = cxl_cx4_setup_msi_irqs(pdev, nvec, type);
+ if (rc)
+ return rc;
+
+ for_each_pci_msi_entry(entry, pdev) {
+ if (!entry->msi_attrib.is_64 && !phb->msi32_support) {
+ pr_warn("%s: Supports only 64-bit MSIs\n",
+ pci_name(pdev));
+ return -ENXIO;
+ }
+
+ hwirq = cxl_next_msi_hwirq(pdev, &ctx, &afu_irq);
+ if (WARN_ON(hwirq <= 0))
+ return (hwirq ? hwirq : -ENOMEM);
+
+ virq = irq_create_mapping(NULL, hwirq);
+ if (virq == NO_IRQ) {
+ pr_warn("%s: Failed to map cxl mode MSI to linux irq\n",
+ pci_name(pdev));
+ return -ENOMEM;
+ }
+
+ rc = pnv_cxl_ioda_msi_setup(pdev, hwirq, virq);
+ if (rc) {
+ pr_warn("%s: Failed to setup cxl mode MSI\n", pci_name(pdev));
+ irq_dispose_mapping(virq);
+ return rc;
+ }
+
+ irq_set_msi_desc(virq, entry);
+ }
+
+ return 0;
+}
+
+void pnv_cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct pnv_phb *phb = hose->private_data;
+ struct msi_desc *entry;
+ irq_hw_number_t hwirq;
+
+ if (WARN_ON(!phb))
+ return;
+
+ for_each_pci_msi_entry(entry, pdev) {
+ if (entry->irq == NO_IRQ)
+ continue;
+ hwirq = virq_to_hw(entry->irq);
+ irq_set_msi_desc(entry->irq, NULL);
+ irq_dispose_mapping(entry->irq);
+ }
+
+ cxl_cx4_teardown_msi_irqs(pdev);
+}
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 104c0405f47c..530d4afbe2fd 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3465,6 +3465,10 @@ static const struct pci_controller_ops pnv_npu_ioda_controller_ops = {
const struct pci_controller_ops pnv_cxl_cx4_ioda_controller_ops = {
.dma_dev_setup = pnv_pci_dma_dev_setup,
.dma_bus_setup = pnv_pci_dma_bus_setup,
+#ifdef CONFIG_PCI_MSI
+ .setup_msi_irqs = pnv_cxl_cx4_setup_msi_irqs,
+ .teardown_msi_irqs = pnv_cxl_cx4_teardown_msi_irqs,
+#endif
.enable_device_hook = pnv_cxl_enable_device_hook,
.disable_device = pnv_cxl_disable_device,
.release_device = pnv_pci_release_device,
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 20c9a6b1c64d..f0c276c05f50 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -247,6 +247,8 @@ extern void pnv_npu_release_ownership(struct pnv_ioda_pe *npe);
/* cxl functions */
extern bool pnv_cxl_enable_device_hook(struct pci_dev *dev);
extern void pnv_cxl_disable_device(struct pci_dev *dev);
+extern int pnv_cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type);
+extern void pnv_cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev);
/* phb ops (cxl switches these when enabling the kernel api on the phb) */
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index f02a85974e49..f3d34b941f85 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -14,6 +14,7 @@
#include <misc/cxl.h>
#include <linux/fs.h>
#include <asm/pnv-pci.h>
+#include <linux/msi.h>
#include "cxl.h"
@@ -489,3 +490,73 @@ int cxl_get_max_irqs_per_process(struct pci_dev *dev)
return afu->irqs_max;
}
EXPORT_SYMBOL_GPL(cxl_get_max_irqs_per_process);
+
+/*
+ * This is a special interrupt allocation routine called from the PHB's MSI
+ * setup function. When capi interrupts are allocated in this manner they must
+ * still be associated with a running context, but since the MSI APIs have no
+ * way to specify this we use the default context associated with the device.
+ *
+ * The Mellanox CX4 has a hardware limitation that restricts the maximum AFU
+ * interrupt number, so in order to overcome this their driver informs us of
+ * the restriction by setting the maximum interrupts per context, and we
+ * allocate additional contexts as necessary so that we can keep the AFU
+ * interrupt number within the supported range.
+ */
+int _cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ struct cxl_context *ctx, *new_ctx, *default_ctx;
+ int remaining;
+ int rc;
+
+ ctx = default_ctx = cxl_get_context(pdev);
+ if (WARN_ON(!default_ctx))
+ return -ENODEV;
+
+ remaining = nvec;
+ while (remaining > 0) {
+ rc = cxl_allocate_afu_irqs(ctx, min(remaining, ctx->afu->irqs_max));
+ if (rc) {
+ pr_warn("%s: Failed to find enough free MSIs\n", pci_name(pdev));
+ return rc;
+ }
+ remaining -= ctx->afu->irqs_max;
+
+ if (ctx != default_ctx && default_ctx->status == STARTED) {
+ WARN_ON(cxl_start_context(ctx,
+ be64_to_cpu(default_ctx->elem->common.wed),
+ NULL));
+ }
+
+ if (remaining > 0) {
+ new_ctx = cxl_dev_context_init(pdev);
+ if (!new_ctx) {
+ pr_warn("%s: Failed to allocate enough contexts for MSIs\n", pci_name(pdev));
+ return -ENOSPC;
+ }
+ list_add(&new_ctx->extra_irq_contexts, &ctx->extra_irq_contexts);
+ ctx = new_ctx;
+ }
+ }
+
+ return 0;
+}
+/* Exported via cxl_base */
+
+void _cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev)
+{
+ struct cxl_context *ctx, *pos, *tmp;
+
+ ctx = cxl_get_context(pdev);
+ if (WARN_ON(!ctx))
+ return;
+
+ cxl_free_afu_irqs(ctx);
+ list_for_each_entry_safe(pos, tmp, &ctx->extra_irq_contexts, extra_irq_contexts) {
+ cxl_stop_context(pos);
+ cxl_free_afu_irqs(pos);
+ list_del(&pos->extra_irq_contexts);
+ cxl_release_context(pos);
+ }
+}
+/* Exported via cxl_base */
diff --git a/drivers/misc/cxl/base.c b/drivers/misc/cxl/base.c
index fe90f895bb10..cd54ce6f6230 100644
--- a/drivers/misc/cxl/base.c
+++ b/drivers/misc/cxl/base.c
@@ -158,6 +158,37 @@ int cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_
}
EXPORT_SYMBOL_GPL(cxl_next_msi_hwirq);
+int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ int ret;
+ struct cxl_calls *calls;
+
+ calls = cxl_calls_get();
+ if (!calls)
+ return false;
+
+ ret = calls->cxl_cx4_setup_msi_irqs(pdev, nvec, type);
+
+ cxl_calls_put(calls);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(cxl_cx4_setup_msi_irqs);
+
+void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev)
+{
+ struct cxl_calls *calls;
+
+ calls = cxl_calls_get();
+ if (!calls)
+ return;
+
+ calls->cxl_cx4_teardown_msi_irqs(pdev);
+
+ cxl_calls_put(calls);
+}
+EXPORT_SYMBOL_GPL(cxl_cx4_teardown_msi_irqs);
+
static int __init cxl_base_init(void)
{
struct device_node *np;
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 73b9a55aa35b..d50cdb137c43 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -731,12 +731,16 @@ ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
bool _cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
void _cxl_pci_disable_device(struct pci_dev *dev);
int _cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq);
+int _cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type);
+void _cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev);
struct cxl_calls {
void (*cxl_slbia)(struct mm_struct *mm);
bool (*cxl_pci_associate_default_context)(struct pci_dev *dev, struct cxl_afu *afu);
void (*cxl_pci_disable_device)(struct pci_dev *dev);
int (*cxl_next_msi_hwirq)(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq);
+ int (*cxl_cx4_setup_msi_irqs)(struct pci_dev *pdev, int nvec, int type);
+ void (*cxl_cx4_teardown_msi_irqs)(struct pci_dev *pdev);
struct module *owner;
};
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index 66fac713e7ad..d9be23b24aa3 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -113,6 +113,8 @@ static struct cxl_calls cxl_calls = {
.cxl_pci_associate_default_context = _cxl_pci_associate_default_context,
.cxl_pci_disable_device = _cxl_pci_disable_device,
.cxl_next_msi_hwirq = _cxl_next_msi_hwirq,
+ .cxl_cx4_setup_msi_irqs = _cxl_cx4_setup_msi_irqs,
+ .cxl_cx4_teardown_msi_irqs = _cxl_cx4_teardown_msi_irqs,
.owner = THIS_MODULE,
};
diff --git a/include/misc/cxl-base.h b/include/misc/cxl-base.h
index bb7e629ae492..b2ebc91fe09a 100644
--- a/include/misc/cxl-base.h
+++ b/include/misc/cxl-base.h
@@ -43,6 +43,8 @@ void cxl_afu_put(struct cxl_afu *afu);
void cxl_slbia(struct mm_struct *mm);
bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
void cxl_pci_disable_device(struct pci_dev *dev);
+int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type);
+void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev);
#else /* CONFIG_CXL_BASE */
@@ -52,6 +54,8 @@ static inline void cxl_afu_put(struct cxl_afu *afu) {}
static inline void cxl_slbia(struct mm_struct *mm) {}
static inline bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu) { return false; }
static inline void cxl_pci_disable_device(struct pci_dev *dev) {}
+static inline int cxl_cx4_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) { return -ENODEV; }
+static inline void cxl_cx4_teardown_msi_irqs(struct pci_dev *pdev) {}
#endif /* CONFIG_CXL_BASE */