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Wed, 14 May 2025 08:28:10 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Martin Habets , Edward Cree , "Jonathan Cameron" Subject: [PATCH v16 12/22] sfc: obtain root decoder with enough HPA free space Date: Wed, 14 May 2025 14:27:33 +0100 Message-ID: <20250514132743.523469-13-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250514132743.523469-1-alejandro.lucero-palau@amd.com> References: <20250514132743.523469-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Received-SPF: None (SATLEXMB05.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015CD:EE_|DS4PR12MB9609:EE_ X-MS-Office365-Filtering-Correlation-Id: 9a4813cc-87ea-4f40-6946-08dd92eb2e48 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|376014|1800799024|7416014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 May 2025 13:28:14.7258 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9a4813cc-87ea-4f40-6946-08dd92eb2e48 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CD.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS4PR12MB9609 From: Alejandro Lucero Asking for available HPA space is the previous step to try to obtain an HPA range suitable to accel driver purposes. Add this call to efx cxl initialization. Make sfc cxl build dependent on CXL region. Signed-off-by: Alejandro Lucero Reviewed-by: Martin Habets Acked-by: Edward Cree Reviewed-by: Jonathan Cameron --- drivers/net/ethernet/sfc/Kconfig | 1 + drivers/net/ethernet/sfc/efx_cxl.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig index 979f2801e2a8..e959d9b4f4ce 100644 --- a/drivers/net/ethernet/sfc/Kconfig +++ b/drivers/net/ethernet/sfc/Kconfig @@ -69,6 +69,7 @@ config SFC_MCDI_LOGGING config SFC_CXL bool "Solarflare SFC9100-family CXL support" depends on SFC && CXL_BUS >= SFC + depends on CXL_REGION default SFC help This enables SFC CXL support if the kernel is configuring CXL for diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c index 53ff97ad07f5..5635672b3fc3 100644 --- a/drivers/net/ethernet/sfc/efx_cxl.c +++ b/drivers/net/ethernet/sfc/efx_cxl.c @@ -26,6 +26,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data) struct cxl_dpa_info sfc_dpa_info = { .size = EFX_CTPIO_BUFFER_SIZE }; + resource_size_t max_size; struct efx_cxl *cxl; u16 dvsec; int rc; @@ -84,6 +85,22 @@ int efx_cxl_init(struct efx_probe_data *probe_data) return PTR_ERR(cxl->cxlmd); } + cxl->cxlrd = cxl_get_hpa_freespace(cxl->cxlmd, 1, + CXL_DECODER_F_RAM | CXL_DECODER_F_TYPE2, + &max_size); + + if (IS_ERR(cxl->cxlrd)) { + pci_err(pci_dev, "cxl_get_hpa_freespace failed\n"); + return PTR_ERR(cxl->cxlrd); + } + + if (max_size < EFX_CTPIO_BUFFER_SIZE) { + pci_err(pci_dev, "%s: not enough free HPA space %pap < %u\n", + __func__, &max_size, EFX_CTPIO_BUFFER_SIZE); + cxl_put_root_decoder(cxl->cxlrd); + return -ENOSPC; + } + probe_data->cxl = cxl; return 0; @@ -91,6 +108,8 @@ int efx_cxl_init(struct efx_probe_data *probe_data) void efx_cxl_exit(struct efx_probe_data *probe_data) { + if (probe_data->cxl) + cxl_put_root_decoder(probe_data->cxl->cxlrd); } MODULE_IMPORT_NS("CXL"); -- 2.34.1