ath11k: Reuse the available memory after firmware reload

Ath11k allocates memory when firmware requests memory in QMI.
Coldboot calibration and firmware recovery uses firmware reload.
On firmware reload, firmware sends memory request again. If Ath11k
allocates memory on first firmware boot, reuse the available
memory. Also check if the segment type and size is same
on the next firmware boot. Reuse if segment type/size is
same as previous firmware boot else free the segment and
allocate the segment with size/type.

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.6.0.1-00752-QCAHKSWPL_SILICONZ-1

Signed-off-by: Anilkumar Kolli <quic_akolli@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220506141448.10340-1-quic_akolli@quicinc.com

3 files changed, 23 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index 26f7bdd1241a..1e98ff9ff288 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -1777,7 +1777,6 @@ static void ath11k_core_reset(struct work_struct *work)
 						ATH11K_RECOVER_START_TIMEOUT_HZ);
 
 	ath11k_hif_power_down(ab);
-	ath11k_qmi_free_resource(ab);
 	ath11k_hif_power_up(ab);
 
 	ath11k_dbg(ab, ATH11K_DBG_BOOT, "reset started\n");
diff --git a/drivers/net/wireless/ath/ath11k/qmi.c b/drivers/net/wireless/ath/ath11k/qmi.c
index d1e945074bc1..61ead37a944a 100644
--- a/drivers/net/wireless/ath/ath11k/qmi.c
+++ b/drivers/net/wireless/ath/ath11k/qmi.c
@@ -1970,6 +1970,21 @@ static int ath11k_qmi_alloc_target_mem_chunk(struct ath11k_base *ab)
 
 	for (i = 0; i < ab->qmi.mem_seg_count; i++) {
 		chunk = &ab->qmi.target_mem[i];
+
+		/* Firmware reloads in coldboot/firmware recovery.
+		 * in such case, no need to allocate memory for FW again.
+		 */
+		if (chunk->vaddr) {
+			if (chunk->prev_type == chunk->type ||
+			    chunk->prev_size == chunk->size)
+				continue;
+
+			/* cannot reuse the existing chunk */
+			dma_free_coherent(ab->dev, chunk->size,
+					  chunk->vaddr, chunk->paddr);
+			chunk->vaddr = NULL;
+		}
+
 		chunk->vaddr = dma_alloc_coherent(ab->dev,
 						  chunk->size,
 						  &chunk->paddr,
@@ -1990,6 +2005,8 @@ static int ath11k_qmi_alloc_target_mem_chunk(struct ath11k_base *ab)
 				   chunk->type);
 			return -EINVAL;
 		}
+		chunk->prev_type = chunk->type;
+		chunk->prev_size = chunk->size;
 	}
 
 	return 0;
@@ -2466,9 +2483,6 @@ static int ath11k_qmi_m3_load(struct ath11k_base *ab)
 	char path[100];
 	int ret;
 
-	if (m3_mem->vaddr || m3_mem->size)
-		return 0;
-
 	fw = ath11k_core_firmware_request(ab, ATH11K_M3_FILE);
 	if (IS_ERR(fw)) {
 		ret = PTR_ERR(fw);
@@ -2478,6 +2492,9 @@ static int ath11k_qmi_m3_load(struct ath11k_base *ab)
 		return ret;
 	}
 
+	if (m3_mem->vaddr || m3_mem->size)
+		goto skip_m3_alloc;
+
 	m3_mem->vaddr = dma_alloc_coherent(ab->dev,
 					   fw->size, &m3_mem->paddr,
 					   GFP_KERNEL);
@@ -2488,6 +2505,7 @@ static int ath11k_qmi_m3_load(struct ath11k_base *ab)
 		return -ENOMEM;
 	}
 
+skip_m3_alloc:
 	memcpy(m3_mem->vaddr, fw->data, fw->size);
 	m3_mem->size = fw->size;
 	release_firmware(fw);
diff --git a/drivers/net/wireless/ath/ath11k/qmi.h b/drivers/net/wireless/ath/ath11k/qmi.h
index c24e6995cca3..c83cf822be81 100644
--- a/drivers/net/wireless/ath/ath11k/qmi.h
+++ b/drivers/net/wireless/ath/ath11k/qmi.h
@@ -97,6 +97,8 @@ struct ath11k_qmi_event_msg {
 struct target_mem_chunk {
 	u32 size;
 	u32 type;
+	u32 prev_size;
+	u32 prev_type;
 	dma_addr_t paddr;
 	u32 *vaddr;
 	void __iomem *iaddr;