[PATCH v3 20/20] efx: support pio mapping based on cxl

alejandro.lucero-palau
2024-09-07T08:20:02Z

From: Alejandro Lucero <alucerop@amd.com>

With a device supporting CXL and successfully initialised, use the cxl
region to map the memory range and use this mapping for PIO buffers.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
drivers/net/ethernet/sfc/ef10.c | 32 +++++++++++++++++++++------
drivers/net/ethernet/sfc/efx_cxl.c | 20 ++++++++++++++++-
drivers/net/ethernet/sfc/mcdi_pcol.h | 12 ++++++++++
drivers/net/ethernet/sfc/net_driver.h | 2 ++
drivers/net/ethernet/sfc/nic.h | 2 ++
5 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 7d69302ffa0a..d4e64cd0f7a4 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -24,6 +24,7 @@
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <net/udp_tunnel.h>
+#include "efx_cxl.h"

/* Hardware control for EF10 architecture including 'Huntington'. */

@@ -177,6 +178,12 @@ static int efx_ef10_init_datapath_caps(struct efx_nic *efx)
efx->num_mac_stats);
}

+ if (outlen < MC_CMD_GET_CAPABILITIES_V7_OUT_LEN)
+ nic_data->datapath_caps3 = 0;
+ else
+ nic_data->datapath_caps3 = MCDI_DWORD(outbuf,
+ GET_CAPABILITIES_V7_OUT_FLAGS3);
+
return 0;
}

@@ -949,7 +956,7 @@ static void efx_ef10_remove(struct efx_nic *efx)

efx_mcdi_rx_free_indir_table(efx);

- if (nic_data->wc_membase)
+ if (nic_data->wc_membase && !efx->efx_cxl_pio_in_use)
iounmap(nic_data->wc_membase);

rc = efx_mcdi_free_vis(efx);
@@ -1263,8 +1270,19 @@ static int efx_ef10_dimension_resources(struct efx_nic *efx)
iounmap(efx->membase);
efx->membase = membase;

- /* Set up the WC mapping if needed */
- if (wc_mem_map_size) {
+ if (!wc_mem_map_size)
+ return 0;
+
+ /* Using PIO through CXL mapping? */
+ if ((nic_data->datapath_caps3 &
+ (1 << MC_CMD_GET_CAPABILITIES_V7_OUT_CXL_CONFIG_ENABLE_LBN)) &&
+ efx->efx_cxl_pio_initialised) {
+ nic_data->pio_write_base = efx->cxl->ctpio_cxl +
+ (pio_write_vi_base * efx->vi_stride +
+ ER_DZ_TX_PIOBUF - uc_mem_map_size);
+ efx->efx_cxl_pio_in_use = true;
+ } else {
+ /* Using legacy PIO BAR mapping */
nic_data->wc_membase = ioremap_wc(efx->membase_phys +
uc_mem_map_size,
wc_mem_map_size);
@@ -1279,12 +1297,12 @@ static int efx_ef10_dimension_resources(struct efx_nic *efx)
nic_data->wc_membase +
(pio_write_vi_base * efx->vi_stride + ER_DZ_TX_PIOBUF -
uc_mem_map_size);
-
- rc = efx_ef10_link_piobufs(efx);
- if (rc)
- efx_ef10_free_piobufs(efx);
}

+ rc = efx_ef10_link_piobufs(efx);
+ if (rc)
+ efx_ef10_free_piobufs(efx);
+
netif_dbg(efx, probe, efx->net_dev,
"memory BAR at %pa (virtual %p+%x UC, %p+%x WC)\n",
&efx->membase_phys, efx->membase, uc_mem_map_size,
diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index dd2dbfb8ba15..ef57f833b8a7 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -21,9 +21,9 @@
int efx_cxl_init(struct efx_nic *efx)
{
struct pci_dev *pci_dev = efx->pci_dev;
+ resource_size_t start, end, max = 0;
struct efx_cxl *cxl;
struct resource res;
- resource_size_t max;
u16 dvsec;
int rc;

@@ -132,10 +132,27 @@ int efx_cxl_init(struct efx_nic *efx)
goto err_region;
}

+ rc = cxl_get_region_params(cxl->efx_region, &start, &end);
+ if (rc) {
+ pci_err(pci_dev, "CXL getting regions params failed");
+ goto err_map;
+ }
+
+ cxl->ctpio_cxl = ioremap(start, end - start);
+ if (!cxl->ctpio_cxl) {
+ pci_err(pci_dev, "CXL ioremap region failed");
+ rc = -EIO;
+ goto err_map;
+ }
+
+ efx->efx_cxl_pio_initialised = true;
+
cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);

return 0;

+err_map:
+ cxl_region_detach(cxl->cxled);
err_region:
cxl_dpa_free(efx->cxl->cxled);
err_release:
@@ -151,6 +168,7 @@ int efx_cxl_init(struct efx_nic *efx)
void efx_cxl_exit(struct efx_nic *efx)
{
if (efx->cxl) {
+ iounmap(efx->cxl->ctpio_cxl);
cxl_region_detach(efx->cxl->cxled);
cxl_dpa_free(efx->cxl->cxled);
cxl_release_resource(efx->cxl->cxlds, CXL_ACCEL_RES_RAM);
diff --git a/drivers/net/ethernet/sfc/mcdi_pcol.h b/drivers/net/ethernet/sfc/mcdi_pcol.h
index cd297e19cddc..c158a1e8d01b 100644
--- a/drivers/net/ethernet/sfc/mcdi_pcol.h
+++ b/drivers/net/ethernet/sfc/mcdi_pcol.h
@@ -16799,6 +16799,9 @@
#define MC_CMD_GET_CAPABILITIES_V7_OUT_DYNAMIC_MPORT_JOURNAL_OFST 148
#define MC_CMD_GET_CAPABILITIES_V7_OUT_DYNAMIC_MPORT_JOURNAL_LBN 14
#define MC_CMD_GET_CAPABILITIES_V7_OUT_DYNAMIC_MPORT_JOURNAL_WIDTH 1
+#define MC_CMD_GET_CAPABILITIES_V7_OUT_CXL_CONFIG_ENABLE_OFST 148
+#define MC_CMD_GET_CAPABILITIES_V7_OUT_CXL_CONFIG_ENABLE_LBN 17
+#define MC_CMD_GET_CAPABILITIES_V7_OUT_CXL_CONFIG_ENABLE_WIDTH 1

/* MC_CMD_GET_CAPABILITIES_V8_OUT msgresponse */
#define MC_CMD_GET_CAPABILITIES_V8_OUT_LEN 160
@@ -17303,6 +17306,9 @@
#define MC_CMD_GET_CAPABILITIES_V8_OUT_DYNAMIC_MPORT_JOURNAL_OFST 148
#define MC_CMD_GET_CAPABILITIES_V8_OUT_DYNAMIC_MPORT_JOURNAL_LBN 14
#define MC_CMD_GET_CAPABILITIES_V8_OUT_DYNAMIC_MPORT_JOURNAL_WIDTH 1
+#define MC_CMD_GET_CAPABILITIES_V8_OUT_CXL_CONFIG_ENABLE_OFST 148
+#define MC_CMD_GET_CAPABILITIES_V8_OUT_CXL_CONFIG_ENABLE_LBN 17
+#define MC_CMD_GET_CAPABILITIES_V8_OUT_CXL_CONFIG_ENABLE_WIDTH 1
/* These bits are reserved for communicating test-specific capabilities to
* host-side test software. All production drivers should treat this field as
* opaque.
@@ -17821,6 +17827,9 @@
#define MC_CMD_GET_CAPABILITIES_V9_OUT_DYNAMIC_MPORT_JOURNAL_OFST 148
#define MC_CMD_GET_CAPABILITIES_V9_OUT_DYNAMIC_MPORT_JOURNAL_LBN 14
#define MC_CMD_GET_CAPABILITIES_V9_OUT_DYNAMIC_MPORT_JOURNAL_WIDTH 1
+#define MC_CMD_GET_CAPABILITIES_V9_OUT_CXL_CONFIG_ENABLE_OFST 148
+#define MC_CMD_GET_CAPABILITIES_V9_OUT_CXL_CONFIG_ENABLE_LBN 17
+#define MC_CMD_GET_CAPABILITIES_V9_OUT_CXL_CONFIG_ENABLE_WIDTH 1
/* These bits are reserved for communicating test-specific capabilities to
* host-side test software. All production drivers should treat this field as
* opaque.
@@ -18374,6 +18383,9 @@
#define MC_CMD_GET_CAPABILITIES_V10_OUT_DYNAMIC_MPORT_JOURNAL_OFST 148
#define MC_CMD_GET_CAPABILITIES_V10_OUT_DYNAMIC_MPORT_JOURNAL_LBN 14
#define MC_CMD_GET_CAPABILITIES_V10_OUT_DYNAMIC_MPORT_JOURNAL_WIDTH 1
+#define MC_CMD_GET_CAPABILITIES_V10_OUT_CXL_CONFIG_ENABLE_OFST 148
+#define MC_CMD_GET_CAPABILITIES_V10_OUT_CXL_CONFIG_ENABLE_LBN 17
+#define MC_CMD_GET_CAPABILITIES_V10_OUT_CXL_CONFIG_ENABLE_WIDTH 1
/* These bits are reserved for communicating test-specific capabilities to
* host-side test software. All production drivers should treat this field as
* opaque.
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 77261de65e63..893e7841ffb4 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -967,6 +967,7 @@ struct efx_cxl;
* @dl_port: devlink port associated with the PF
* @cxl: details of related cxl objects
* @efx_cxl_pio_initialised: clx initialization outcome.
+ * @efx_cxl_pio_in_use: PIO using CXL mapping
* @mem_bar: The BAR that is mapped into membase.
* @reg_base: Offset from the start of the bar to the function control window.
* @monitor_work: Hardware monitor workitem
@@ -1154,6 +1155,7 @@ struct efx_nic {
struct devlink_port *dl_port;
struct efx_cxl *cxl;
bool efx_cxl_pio_initialised;
+ bool efx_cxl_pio_in_use;
unsigned int mem_bar;
u32 reg_base;

diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index 1db64fc6e909..b7148810acdb 100644
--- a/drivers/net/ethernet/sfc/nic.h
+++ b/drivers/net/ethernet/sfc/nic.h
@@ -151,6 +151,7 @@ enum {
* @datapath_caps: Capabilities of datapath firmware (FLAGS1 field of
* %MC_CMD_GET_CAPABILITIES response)
* @datapath_caps2: Further Capabilities of datapath firmware (FLAGS2 field of
+ * @datapath_caps3: Further Capabilities of datapath firmware (FLAGS3 field of
* %MC_CMD_GET_CAPABILITIES response)
* @rx_dpcpu_fw_id: Firmware ID of the RxDPCPU
* @tx_dpcpu_fw_id: Firmware ID of the TxDPCPU
@@ -186,6 +187,7 @@ struct efx_ef10_nic_data {
bool must_check_datapath_caps;
u32 datapath_caps;
u32 datapath_caps2;
+ u32 datapath_caps3;
unsigned int rx_dpcpu_fw_id;
unsigned int tx_dpcpu_fw_id;
bool must_probe_vswitching;
--
2.17.1