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Message-Id: <20190917014307.30485-5-alastair@au1.ibm.com>
Date: Tue, 17 Sep 2019 11:43:00 +1000
From: "Alastair D'Silva" <alastair@....ibm.com>
To: alastair@...ilva.org
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Frederic Barrat <fbarrat@...ux.ibm.com>,
Andrew Donnellan <ajd@...ux.ibm.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Cédric Le Goater <clg@...d.org>,
Allison Randal <allison@...utok.net>,
Vaibhav Jain <vaibhav@...ux.ibm.com>,
Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
David Gibson <david@...son.dropbear.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] ocxl: Add functions to map/unmap LPC memory
From: Alastair D'Silva <alastair@...ilva.org>
Add functions to map/unmap LPC memory
Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
---
drivers/misc/ocxl/config.c | 4 +++
drivers/misc/ocxl/core.c | 50 +++++++++++++++++++++++++++++++
drivers/misc/ocxl/link.c | 4 +--
drivers/misc/ocxl/ocxl_internal.h | 10 +++++--
include/misc/ocxl.h | 18 +++++++++++
5 files changed, 82 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/ocxl/config.c b/drivers/misc/ocxl/config.c
index c8e19bfb5ef9..fb0c3b6f8312 100644
--- a/drivers/misc/ocxl/config.c
+++ b/drivers/misc/ocxl/config.c
@@ -568,6 +568,10 @@ static int read_afu_lpc_memory_info(struct pci_dev *dev,
afu->special_purpose_mem_size =
total_mem_size - lpc_mem_size;
}
+
+ dev_info(&dev->dev, "Probed LPC memory of %#llx bytes and special purpose memory of %#llx bytes\n",
+ afu->lpc_mem_size, afu->special_purpose_mem_size);
+
return 0;
}
diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
index fdfe4e0a34e1..eb24bb9d655f 100644
--- a/drivers/misc/ocxl/core.c
+++ b/drivers/misc/ocxl/core.c
@@ -210,6 +210,55 @@ static void unmap_mmio_areas(struct ocxl_afu *afu)
release_fn_bar(afu->fn, afu->config.global_mmio_bar);
}
+int ocxl_map_lpc_mem(struct ocxl_afu *afu)
+{
+ struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
+
+ if ((afu->config.lpc_mem_size + afu->config.special_purpose_mem_size) == 0)
+ return 0;
+
+ afu->lpc_base_addr = ocxl_link_lpc_online(afu->fn->link, dev);
+ if (afu->lpc_base_addr == 0)
+ return -EINVAL;
+
+ if (afu->config.lpc_mem_size) {
+ afu->lpc_res.start = afu->lpc_base_addr + afu->config.lpc_mem_offset;
+ afu->lpc_res.end = afu->lpc_res.start + afu->config.lpc_mem_size - 1;
+ }
+
+ if (afu->config.special_purpose_mem_size) {
+ afu->special_purpose_res.start = afu->lpc_base_addr +
+ afu->config.special_purpose_mem_offset;
+ afu->special_purpose_res.end = afu->special_purpose_res.start +
+ afu->config.special_purpose_mem_size - 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(ocxl_map_lpc_mem);
+
+struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu)
+{
+ return &afu->lpc_res;
+}
+EXPORT_SYMBOL(ocxl_afu_lpc_mem);
+
+static void unmap_lpc_mem(struct ocxl_afu *afu)
+{
+ struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
+
+ if (afu->lpc_res.start || afu->special_purpose_res.start) {
+ void *link = afu->fn->link;
+
+ ocxl_link_lpc_offline(link, dev);
+
+ afu->lpc_res.start = 0;
+ afu->lpc_res.end = 0;
+ afu->special_purpose_res.start = 0;
+ afu->special_purpose_res.end = 0;
+ }
+}
+
static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
{
int rc;
@@ -250,6 +299,7 @@ static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
static void deconfigure_afu(struct ocxl_afu *afu)
{
+ unmap_lpc_mem(afu);
unmap_mmio_areas(afu);
reclaim_afu_pasid(afu);
reclaim_afu_actag(afu);
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
index 2874811a4398..9e303a5f4d85 100644
--- a/drivers/misc/ocxl/link.c
+++ b/drivers/misc/ocxl/link.c
@@ -738,7 +738,7 @@ int ocxl_link_add_lpc_mem(void *link_handle, u64 size)
}
EXPORT_SYMBOL_GPL(ocxl_link_add_lpc_mem);
-u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev)
+u64 ocxl_link_lpc_online(void *link_handle, struct pci_dev *pdev)
{
struct ocxl_link *link = (struct ocxl_link *) link_handle;
@@ -759,7 +759,7 @@ u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev)
return link->lpc_mem;
}
-void ocxl_link_lpc_release(void *link_handle, struct pci_dev *pdev)
+void ocxl_link_lpc_offline(void *link_handle, struct pci_dev *pdev)
{
struct ocxl_link *link = (struct ocxl_link *) link_handle;
diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
index db2647a90fc8..5656a4aab5b7 100644
--- a/drivers/misc/ocxl/ocxl_internal.h
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -52,6 +52,12 @@ struct ocxl_afu {
void __iomem *global_mmio_ptr;
u64 pp_mmio_start;
void *private;
+ u64 lpc_base_addr; /* Covers both LPC & special purpose memory */
+ struct bin_attribute attr_global_mmio;
+ struct bin_attribute attr_lpc_mem;
+ struct resource lpc_res;
+ struct bin_attribute attr_special_purpose_mem;
+ struct resource special_purpose_res;
};
enum ocxl_context_status {
@@ -170,7 +176,7 @@ extern u64 ocxl_link_get_lpc_mem_sz(void *link_handle);
* @link_handle: The OpenCAPI link handle
* @pdev: A device that is on the link
*/
-u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev);
+u64 ocxl_link_lpc_online(void *link_handle, struct pci_dev *pdev);
/**
* Release the LPC memory device for an OpenCAPI device
@@ -181,6 +187,6 @@ u64 ocxl_link_lpc_map(void *link_handle, struct pci_dev *pdev);
* @link_handle: The OpenCAPI link handle
* @pdev: A device that is on the link
*/
-void ocxl_link_lpc_release(void *link_handle, struct pci_dev *pdev);
+void ocxl_link_lpc_offline(void *link_handle, struct pci_dev *pdev);
#endif /* _OCXL_INTERNAL_H_ */
diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
index 06dd5839e438..a1897737908d 100644
--- a/include/misc/ocxl.h
+++ b/include/misc/ocxl.h
@@ -212,6 +212,24 @@ int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
// AFU Metadata
+/**
+ * Map the LPC system & special purpose memory for an AFU
+ *
+ * Do not call this during device discovery, as there may me multiple
+ * devices on a link, and the memory is mapped for the whole link, not
+ * just one device. It should only be called after all devices have
+ * registered their memory on the link.
+ *
+ * afu: The AFU that has the LPC memory to map
+ */
+extern int ocxl_map_lpc_mem(struct ocxl_afu *afu);
+
+/**
+ * Get the physical address range of LPC memory for an AFU
+ * afu: The AFU associated with the LPC memory
+ */
+extern struct resource *ocxl_afu_lpc_mem(struct ocxl_afu *afu);
+
/**
* Get a pointer to the config for an AFU
*
--
2.21.0
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