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authorAlastair D'Silva <alastair@d-silva.org>2018-06-28 12:05:01 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2018-07-02 23:54:30 +1000
commit0cfd7335d1ebea42cf113fd22452f6a10d3960fe (patch)
tree6fe4c81a99b483601c0213a5212f30cdd7383320 /drivers/misc/cxl
parentc5828150067c47a97f30e690a472e0548d3ac97d (diff)
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Revert "cxl: Add support for interrupts on the Mellanox CX4"
Remove abandonned capi support for the Mellanox CX4. This reverts commit a2f67d5ee8d950caaa7a6144cf0bfb256500b73e. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc/cxl')
-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
4 files changed, 0 insertions, 108 deletions
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,
};