[PATCH v2 02/10] Revert "cxl: Add support for interrupts on the Mellanox CX4"
Frederic Barrat
fbarrat at linux.ibm.com
Thu Jun 28 20:05:01 AEST 2018
From: Alastair D'Silva <alastair at d-silva.org>
Remove abandonned capi support for the Mellanox CX4.
This reverts commit a2f67d5ee8d950caaa7a6144cf0bfb256500b73e.
Signed-off-by: Alastair D'Silva <alastair at d-silva.org>
---
arch/powerpc/platforms/powernv/pci-cxl.c | 84 -----------------------
arch/powerpc/platforms/powernv/pci-ioda.c | 4 --
arch/powerpc/platforms/powernv/pci.h | 2 -
drivers/misc/cxl/api.c | 71 -------------------
drivers/misc/cxl/base.c | 31 ---------
drivers/misc/cxl/cxl.h | 4 --
drivers/misc/cxl/main.c | 2 -
include/misc/cxl-base.h | 4 --
8 files changed, 202 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/pci-cxl.c b/arch/powerpc/platforms/powernv/pci-cxl.c
index cee003de63af..c447b7f03c09 100644
--- a/arch/powerpc/platforms/powernv/pci-cxl.c
+++ b/arch/powerpc/platforms/powernv/pci-cxl.c
@@ -8,7 +8,6 @@
*/
#include <linux/module.h>
-#include <linux/msi.h>
#include <asm/pci-bridge.h>
#include <asm/pnv-pci.h>
#include <asm/opal.h>
@@ -292,86 +291,3 @@ 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) {
- 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)
- 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 5bd0eb6681bc..41f8f0ff4a55 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3847,10 +3847,6 @@ static const struct pci_controller_ops pnv_npu_ocapi_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 eada4b6068cb..ba41913c7e21 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -265,8 +265,6 @@ extern int pnv_npu2_init(struct pnv_phb *phb);
/* 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 21d620e29fea..2e5862b7a074 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -11,7 +11,6 @@
#include <linux/slab.h>
#include <linux/file.h>
#include <misc/cxl.h>
-#include <linux/msi.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/sched/mm.h>
@@ -595,73 +594,3 @@ 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 (IS_ERR(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 cd54ce6f6230..fe90f895bb10 100644
--- a/drivers/misc/cxl/base.c
+++ b/drivers/misc/cxl/base.c
@@ -158,37 +158,6 @@ 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 af8794719956..9688fe8b4d80 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -879,16 +879,12 @@ 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 c1ba0d42cbc8..59a904efd104 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -107,8 +107,6 @@ 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 b2ebc91fe09a..bb7e629ae492 100644
--- a/include/misc/cxl-base.h
+++ b/include/misc/cxl-base.h
@@ -43,8 +43,6 @@ 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 */
@@ -54,8 +52,6 @@ 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 */
--
2.17.1
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