Bluetooth: btintel_pcie: Align shared DMA memory to 128 bytes
PATCH RESEND 1/1 Bluetooth: btintel_pcie: Align shared DMA memory to 128 bytes
Align each descriptor/index/context region to 128 bytes before calculating the total DMA pool size. This ensures the memory layout shared with firmware meets the 128-byte alignment requirement.
The DMA pool alignment is also set to 128 bytes to match the firmware expectation for all shared structures.
--- drivers/bluetooth/btintel_pcie.c | 94 ++++++++++++++++++-------------- drivers/bluetooth/btintel_pcie.h | 3 - 2 files changed, 53 insertions(+), 44 deletions(-)
drivers/bluetooth/btintel_pcie.c +53 -41
@@ -37,6 +37,8 @@#define POLL_INTERVAL_US 10 +#define BTINTEL_PCIE_DMA_ALIGN_128B 128/* 128 byte aligned */ +/* Intel Bluetooth PCIe device id table */ static const struct pci_device_id btintel_pcie_table[] = {/* BlazarI, Wildcat Lake */
@@ -1751,27 +1753,6 @@ static int btintel_pcie_setup_rxq_bufs(struct btintel_pcie_data *data,return 0 ; } -static void btintel_pcie_setup_ia (struct btintel_pcie_data *data, -dma_addr_t p_addr,void *v_addr, -struct ia *ia) -{ -/* TR Head Index Array */ - ia->tr_hia_p_addr = p_addr; - ia->tr_hia = v_addr; - -/* TR Tail Index Array */ - ia->tr_tia_p_addr = p_addr +sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES ; - ia->tr_tia = v_addr +sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES ; - -/* CR Head index Array */ - ia->cr_hia_p_addr = p_addr + (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *2 ); - ia->cr_hia = v_addr + (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *2 ); - -/* CR Tail Index Array */ - ia->cr_tia_p_addr = p_addr + (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *3 ); - ia->cr_tia = v_addr + (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *3 ); -} -static void btintel_pcie_free (struct btintel_pcie_data *data) {btintel_pcie_free_rxq_bufs (data, &data->rxq);
@@ -1789,13 +1770,16 @@ static int btintel_pcie_alloc(struct btintel_pcie_data *data)size_t total;dma_addr_t p_addr;void *v_addr; +size_t tfd_size, frbd_size, ctx_size, ci_size, urbd0_size, urbd1_size;/* Allocate the chunk of DMA memory for descriptors, index array, and * context information, instead of allocating individually. * The DMA memory for data buffer is allocated while setting up the * each queue. * -* Total size is sum of the following +* Total size is sum of the following and each of the individual sizes +* are aligned to 128 bytes before adding up. +* * + size of TFD * Number of descriptors in queue * + size of URBD0 * Number of descriptors in queue * + size of FRBD * Number of descriptors in queue
@@ -1803,15 +1787,25 @@ static int btintel_pcie_alloc(struct btintel_pcie_data *data)* + size of index * Number of queues(2) * type of index array(4) * + size of context information */ - total = (sizeof (struct tfd ) +sizeof (struct urbd0 )) *BTINTEL_PCIE_TX_DESCS_COUNT ; - total += (sizeof (struct frbd ) +sizeof (struct urbd1 )) *BTINTEL_PCIE_RX_DESCS_COUNT ; + tfd_size =ALIGN (sizeof (struct tfd ) *BTINTEL_PCIE_TX_DESCS_COUNT , +BTINTEL_PCIE_DMA_ALIGN_128B ); + urbd0_size =ALIGN (sizeof (struct urbd0 ) *BTINTEL_PCIE_TX_DESCS_COUNT , +BTINTEL_PCIE_DMA_ALIGN_128B ); -/* Add the sum of size of index array and size of ci struct */ - total += (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *4 ) +sizeof (struct ctx_info ); + frbd_size =ALIGN (sizeof (struct frbd ) *BTINTEL_PCIE_RX_DESCS_COUNT , +BTINTEL_PCIE_DMA_ALIGN_128B ); + urbd1_size =ALIGN (sizeof (struct urbd1 ) *BTINTEL_PCIE_RX_DESCS_COUNT , +BTINTEL_PCIE_DMA_ALIGN_128B ); + + ci_size =ALIGN (sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES , +BTINTEL_PCIE_DMA_ALIGN_128B ); + + ctx_size =ALIGN (sizeof (struct ctx_info ),BTINTEL_PCIE_DMA_ALIGN_128B ); + + total = tfd_size + urbd0_size + frbd_size + urbd1_size + ctx_size + ci_size *4 ; -/* Allocate DMA Pool */ data->dma_pool =dma_pool_create (KBUILD_MODNAME , &data->pdev->dev, - total,BTINTEL_PCIE_DMA_POOL_ALIGNMENT ,0 ); + total,BTINTEL_PCIE_DMA_ALIGN_128B ,0 );if (!data->dma_pool) { err = -ENOMEM ; goto exit_error;
@@ -1836,29 +1830,29 @@ static int btintel_pcie_alloc(struct btintel_pcie_data *data) data->txq.tfds_p_addr = p_addr; data->txq.tfds = v_addr; - p_addr += (sizeof (struct tfd ) *BTINTEL_PCIE_TX_DESCS_COUNT ); - v_addr += (sizeof (struct tfd ) *BTINTEL_PCIE_TX_DESCS_COUNT ); + p_addr += tfd_size; + v_addr += tfd_size;/* Setup urbd0 */ data->txq.urbd0s_p_addr = p_addr; data->txq.urbd0s = v_addr; - p_addr += (sizeof (struct urbd0 ) *BTINTEL_PCIE_TX_DESCS_COUNT ); - v_addr += (sizeof (struct urbd0 ) *BTINTEL_PCIE_TX_DESCS_COUNT ); + p_addr += urbd0_size; + v_addr += urbd0_size;/* Setup FRBD*/ data->rxq.frbds_p_addr = p_addr; data->rxq.frbds = v_addr; - p_addr += (sizeof (struct frbd ) *BTINTEL_PCIE_RX_DESCS_COUNT ); - v_addr += (sizeof (struct frbd ) *BTINTEL_PCIE_RX_DESCS_COUNT ); + p_addr += frbd_size; + v_addr += frbd_size;/* Setup urbd1 */ data->rxq.urbd1s_p_addr = p_addr; data->rxq.urbd1s = v_addr; - p_addr += (sizeof (struct urbd1 ) *BTINTEL_PCIE_RX_DESCS_COUNT ); - v_addr += (sizeof (struct urbd1 ) *BTINTEL_PCIE_RX_DESCS_COUNT ); + p_addr += urbd1_size; + v_addr += urbd1_size;/* Setup data buffers for txq */ err =btintel_pcie_setup_txq_bufs (data, &data->txq);
@@ -1870,8 +1864,29 @@ static int btintel_pcie_alloc(struct btintel_pcie_data *data)if (err) goto exit_error_txq; -/* Setup Index Array */ -btintel_pcie_setup_ia (data, p_addr, v_addr, &data->ia); +/* TR Head Index Array */ + data->ia.tr_hia_p_addr = p_addr; + data->ia.tr_hia = v_addr; + p_addr += ci_size; + v_addr += ci_size; + +/* TR Tail Index Array */ + data->ia.tr_tia_p_addr = p_addr; + data->ia.tr_tia = v_addr; + p_addr += ci_size; + v_addr += ci_size; + +/* CR Head index Array */ + data->ia.cr_hia_p_addr = p_addr; + data->ia.cr_hia = v_addr; + p_addr += ci_size; + v_addr += ci_size; + +/* CR Tail Index Array */ + data->ia.cr_tia_p_addr = p_addr; + data->ia.cr_tia = v_addr; + p_addr += ci_size; + v_addr += ci_size;/* Setup data buffers for dbgc */ err =btintel_pcie_setup_dbgc (data);
@@ -1879,9 +1894,6 @@ static int btintel_pcie_alloc(struct btintel_pcie_data *data) goto exit_error_txq;/* Setup Context Information */ - p_addr +=sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *4 ; - v_addr +=sizeof (u16) *BTINTEL_PCIE_NUM_QUEUES *4 ; - data->ci = v_addr; data->ci_p_addr = p_addr;
drivers/bluetooth/btintel_pcie.h +0 -3
@@ -178,9 +178,6 @@ enum {/* The size of DMA buffer for TX and RX in bytes */ #define BTINTEL_PCIE_BUFFER_SIZE 4096 -/* DMA allocation alignment */ -#define BTINTEL_PCIE_DMA_POOL_ALIGNMENT 256 -#define BTINTEL_PCIE_TX_WAIT_TIMEOUT_MS 500/* Doorbell vector for TFD */
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Thank you for submitting the patches to the linux bluetooth mailing list. This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=1078050
---Test result---
Test Summary:
CheckPatch PENDING 0.33 seconds GitLint PENDING 0.30 seconds SubjectPrefix PASS 0.13 seconds BuildKernel PASS 26.33 seconds CheckAllWarning PASS 28.72 seconds CheckSparse PASS 27.87 seconds BuildKernel32 PASS 25.58 seconds TestRunnerSetup PASS 569.48 seconds TestRunner_l2cap-tester PASS 27.94 seconds TestRunner_iso-tester PASS 35.81 seconds TestRunner_bnep-tester PASS 6.38 seconds TestRunner_mgmt-tester FAIL 115.46 seconds TestRunner_rfcomm-tester PASS 9.43 seconds TestRunner_sco-tester FAIL 14.24 seconds TestRunner_ioctl-tester PASS 10.19 seconds TestRunner_mesh-tester FAIL 11.53 seconds TestRunner_smp-tester PASS 8.68 seconds TestRunner_userchan-tester PASS 6.71 seconds IncrementalBuild PENDING 0.58 seconds
Details
##############################
Test: CheckPatch - PENDING
Desc: Run checkpatch.pl script
Output:
##############################
Test: GitLint - PENDING
Desc: Run gitlint
Output:
##############################
Test: TestRunner_mgmt-tester - FAIL
Desc: Run mgmt-tester with test-runner Output:
Total: 494, Passed: 489 (99.0%), Failed: 1, Not Run: 4
Failed Test Cases
Read Exp Feature - Success Failed 0.111 seconds
##############################
Test: TestRunner_sco-tester - FAIL
Desc: Run sco-tester with test-runner
Output:
WARNING: possible circular locking dependency detected
BUG: sleeping function called from invalid context at net/core/sock.c:3782
Total: 30, Passed: 30 (100.0%), Failed: 0, Not Run: 0
##############################
Test: TestRunner_mesh-tester - FAIL
Desc: Run mesh-tester with test-runner Output:
Total: 10, Passed: 8 (80.0%), Failed: 2, Not Run: 0
Failed Test Cases
Mesh - Send cancel - 1 Timed out 1.809 seconds Mesh - Send cancel - 2 Timed out 1.995 seconds
##############################
Test: IncrementalBuild - PENDING
Desc: Incremental build with the patches in the series Output:
---
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Linux Bluetooth
This patch was applied to bluetooth/bluetooth-next.git (master) by Luiz Augusto von Dentz <[email protected]>:
Hello:
This patch was applied to bluetooth/bluetooth-next.git (master) by Luiz Augusto von Dentz <[email protected]>:
Quoted 8 lines · On Tue, 7 Apr 2026 15:32:40 +0530 you wrote:
Align each descriptor/index/context region to 128 bytes before calculating the total DMA pool size. This ensures the memory layout shared with firmware meets the 128-byte alignment requirement.
The DMA pool alignment is also set to 128 bytes to match the firmware expectation for all shared structures.
[...]
Here is the summary with links:
- [RESEND,v1] Bluetooth: btintel_pcie: Align shared DMA memory to 128 bytes
https://git.kernel.org/bluetooth/bluetooth-next/c/0875da1eeb29
You are awesome, thank you!
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