crypto: qat - num_rings_per_bank is device dependent

This change is to allow support for QAT devices that may not have 16
rings per bank.
The rings structure in bank is allocated dynamically based on the number
of banks supported by a device.

Note that in the error path in adf_init_bank(), ring->inflights is set
to NULL after the free to silence a false positive double free reported
by clang scan-build.
Signed-off-by: Ahsan Atta <ahsan.atta@intel.com>
Co-developed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Fiona Trahe <fiona.trahe@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_c3xxx/adf_c3xxx_hw_data.c

@@ -176,6 +176,7 @@ void adf_init_hw_data_c3xxx(struct adf_hw_device_data *hw_data)
 	hw_data->dev_class = &c3xxx_class;
 	hw_data->instance_id = c3xxx_class.instances++;
 	hw_data->num_banks = ADF_C3XXX_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_C3XXX_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_C3XXX_MAX_ACCELENGINES;

drivers/crypto/qat/qat_c3xxxvf/adf_c3xxxvf_hw_data.c

@@ -69,6 +69,7 @@ void adf_init_hw_data_c3xxxiov(struct adf_hw_device_data *hw_data)
 {
 	hw_data->dev_class = &c3xxxiov_class;
 	hw_data->num_banks = ADF_C3XXXIOV_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_C3XXXIOV_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_C3XXXIOV_MAX_ACCELENGINES;

drivers/crypto/qat/qat_c62x/adf_c62x_hw_data.c

@@ -186,6 +186,7 @@ void adf_init_hw_data_c62x(struct adf_hw_device_data *hw_data)
 	hw_data->dev_class = &c62x_class;
 	hw_data->instance_id = c62x_class.instances++;
 	hw_data->num_banks = ADF_C62X_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_C62X_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_C62X_MAX_ACCELENGINES;

drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c

@@ -69,6 +69,7 @@ void adf_init_hw_data_c62xiov(struct adf_hw_device_data *hw_data)
 {
 	hw_data->dev_class = &c62xiov_class;
 	hw_data->num_banks = ADF_C62XIOV_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_C62XIOV_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_C62XIOV_MAX_ACCELENGINES;

drivers/crypto/qat/qat_common/adf_accel_devices.h

@@ -139,6 +139,7 @@ struct adf_hw_device_data {
 	u16 tx_rings_mask;
 	u8 tx_rx_gap;
 	u8 num_banks;
+	u8 num_rings_per_bank;
 	u8 num_accel;
 	u8 num_logical_accel;
 	u8 num_engines;
@@ -156,6 +157,8 @@ struct adf_hw_device_data {
 #define GET_BARS(accel_dev) ((accel_dev)->accel_pci_dev.pci_bars)
 #define GET_HW_DATA(accel_dev) (accel_dev->hw_device)
 #define GET_MAX_BANKS(accel_dev) (GET_HW_DATA(accel_dev)->num_banks)
+#define GET_NUM_RINGS_PER_BANK(accel_dev) \
+	GET_HW_DATA(accel_dev)->num_rings_per_bank
 #define GET_MAX_ACCELENGINES(accel_dev) (GET_HW_DATA(accel_dev)->num_engines)
 #define accel_to_pci_dev(accel_ptr) accel_ptr->accel_pci_dev.pci_dev
 

drivers/crypto/qat/qat_common/adf_transport.c

@@ -190,6 +190,7 @@ int adf_create_ring(struct adf_accel_dev *accel_dev, const char *section,
 		    struct adf_etr_ring_data **ring_ptr)
 {
 	struct adf_etr_data *transport_data = accel_dev->transport;
+	u8 num_rings_per_bank = GET_NUM_RINGS_PER_BANK(accel_dev);
 	struct adf_etr_bank_data *bank;
 	struct adf_etr_ring_data *ring;
 	char val[ADF_CFG_MAX_VAL_LEN_IN_BYTES];
@@ -219,7 +220,7 @@ int adf_create_ring(struct adf_accel_dev *accel_dev, const char *section,
 		dev_err(&GET_DEV(accel_dev), "Can't get ring number\n");
 		return -EFAULT;
 	}
-	if (ring_num >= ADF_ETR_MAX_RINGS_PER_BANK) {
+	if (ring_num >= num_rings_per_bank) {
 		dev_err(&GET_DEV(accel_dev), "Invalid ring number\n");
 		return -EFAULT;
 	}
@@ -286,15 +287,15 @@ void adf_remove_ring(struct adf_etr_ring_data *ring)
 
 static void adf_ring_response_handler(struct adf_etr_bank_data *bank)
 {
-	u32 empty_rings, i;
+	u8 num_rings_per_bank = GET_NUM_RINGS_PER_BANK(bank->accel_dev);
+	unsigned long empty_rings;
+	int i;
 
 	empty_rings = READ_CSR_E_STAT(bank->csr_addr, bank->bank_number);
 	empty_rings = ~empty_rings & bank->irq_mask;
 
-	for (i = 0; i < ADF_ETR_MAX_RINGS_PER_BANK; ++i) {
-		if (empty_rings & (1 << i))
-			adf_handle_response(&bank->rings[i]);
-	}
+	for_each_set_bit(i, &empty_rings, num_rings_per_bank)
+		adf_handle_response(&bank->rings[i]);
 }
 
 void adf_response_handler(uintptr_t bank_addr)
@@ -343,9 +344,12 @@ static int adf_init_bank(struct adf_accel_dev *accel_dev,
 			 u32 bank_num, void __iomem *csr_addr)
 {
 	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	u8 num_rings_per_bank = hw_data->num_rings_per_bank;
 	struct adf_etr_ring_data *ring;
 	struct adf_etr_ring_data *tx_ring;
 	u32 i, coalesc_enabled = 0;
+	unsigned long ring_mask;
+	int size;
 
 	memset(bank, 0, sizeof(*bank));
 	bank->bank_number = bank_num;
@@ -353,6 +357,13 @@ static int adf_init_bank(struct adf_accel_dev *accel_dev,
 	bank->accel_dev = accel_dev;
 	spin_lock_init(&bank->lock);
 
+	/* Allocate the rings in the bank */
+	size = num_rings_per_bank * sizeof(struct adf_etr_ring_data);
+	bank->rings = kzalloc_node(size, GFP_KERNEL,
+				   dev_to_node(&GET_DEV(accel_dev)));
+	if (!bank->rings)
+		return -ENOMEM;
+
 	/* Enable IRQ coalescing always. This will allow to use
 	 * the optimised flag and coalesc register.
 	 * If it is disabled in the config file just use min time value */
@@ -363,7 +374,7 @@ static int adf_init_bank(struct adf_accel_dev *accel_dev,
 	else
 		bank->irq_coalesc_timer = ADF_COALESCING_MIN_TIME;
 
-	for (i = 0; i < ADF_ETR_MAX_RINGS_PER_BANK; i++) {
+	for (i = 0; i < num_rings_per_bank; i++) {
 		WRITE_CSR_RING_CONFIG(csr_addr, bank_num, i, 0);
 		WRITE_CSR_RING_BASE(csr_addr, bank_num, i, 0);
 		ring = &bank->rings[i];
@@ -394,11 +405,13 @@ static int adf_init_bank(struct adf_accel_dev *accel_dev,
 	WRITE_CSR_INT_SRCSEL(csr_addr, bank_num);
 	return 0;
 err:
-	for (i = 0; i < ADF_ETR_MAX_RINGS_PER_BANK; i++) {
+	ring_mask = hw_data->tx_rings_mask;
+	for_each_set_bit(i, &ring_mask, num_rings_per_bank) {
 		ring = &bank->rings[i];
-		if (hw_data->tx_rings_mask & (1 << i))
-			kfree(ring->inflights);
+		kfree(ring->inflights);
+		ring->inflights = NULL;
 	}
+	kfree(bank->rings);
 	return -ENOMEM;
 }
 
@@ -464,11 +477,12 @@ EXPORT_SYMBOL_GPL(adf_init_etr_data);
 
 static void cleanup_bank(struct adf_etr_bank_data *bank)
 {
+	struct adf_accel_dev *accel_dev = bank->accel_dev;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	u8 num_rings_per_bank = hw_data->num_rings_per_bank;
 	u32 i;
 
-	for (i = 0; i < ADF_ETR_MAX_RINGS_PER_BANK; i++) {
-		struct adf_accel_dev *accel_dev = bank->accel_dev;
-		struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	for (i = 0; i < num_rings_per_bank; i++) {
 		struct adf_etr_ring_data *ring = &bank->rings[i];
 
 		if (bank->ring_mask & (1 << i))
@@ -477,6 +491,7 @@ static void cleanup_bank(struct adf_etr_bank_data *bank)
 		if (hw_data->tx_rings_mask & (1 << i))
 			kfree(ring->inflights);
 	}
+	kfree(bank->rings);
 	adf_bank_debugfs_rm(bank);
 	memset(bank, 0, sizeof(*bank));
 }
@@ -507,6 +522,7 @@ void adf_cleanup_etr_data(struct adf_accel_dev *accel_dev)
 	if (etr_data) {
 		adf_cleanup_etr_handles(accel_dev);
 		debugfs_remove(etr_data->debug);
+		kfree(etr_data->banks->rings);
 		kfree(etr_data->banks);
 		kfree(etr_data);
 		accel_dev->transport = NULL;

drivers/crypto/qat/qat_common/adf_transport_debug.c

@@ -117,11 +117,14 @@ void adf_ring_debugfs_rm(struct adf_etr_ring_data *ring)
 
 static void *adf_bank_start(struct seq_file *sfile, loff_t *pos)
 {
+	struct adf_etr_bank_data *bank = sfile->private;
+	u8 num_rings_per_bank = GET_NUM_RINGS_PER_BANK(bank->accel_dev);
+
 	mutex_lock(&bank_read_lock);
 	if (*pos == 0)
 		return SEQ_START_TOKEN;
 
-	if (*pos >= ADF_ETR_MAX_RINGS_PER_BANK)
+	if (*pos >= num_rings_per_bank)
 		return NULL;
 
 	return pos;
@@ -129,7 +132,10 @@ static void *adf_bank_start(struct seq_file *sfile, loff_t *pos)
 
 static void *adf_bank_next(struct seq_file *sfile, void *v, loff_t *pos)
 {
-	if (++(*pos) >= ADF_ETR_MAX_RINGS_PER_BANK)
+	struct adf_etr_bank_data *bank = sfile->private;
+	u8 num_rings_per_bank = GET_NUM_RINGS_PER_BANK(bank->accel_dev);
+
+	if (++(*pos) >= num_rings_per_bank)
 		return NULL;
 
 	return pos;

drivers/crypto/qat/qat_common/adf_transport_internal.h

@@ -28,7 +28,7 @@ struct adf_etr_ring_data {
 };
 
 struct adf_etr_bank_data {
-	struct adf_etr_ring_data rings[ADF_ETR_MAX_RINGS_PER_BANK];
+	struct adf_etr_ring_data *rings;
 	struct tasklet_struct resp_handler;
 	void __iomem *csr_addr;
 	u32 irq_coalesc_timer;

drivers/crypto/qat/qat_dh895xcc/adf_dh895xcc_hw_data.c

@@ -185,6 +185,7 @@ void adf_init_hw_data_dh895xcc(struct adf_hw_device_data *hw_data)
 	hw_data->dev_class = &dh895xcc_class;
 	hw_data->instance_id = dh895xcc_class.instances++;
 	hw_data->num_banks = ADF_DH895XCC_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_DH895XCC_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_DH895XCC_MAX_ACCELENGINES;

drivers/crypto/qat/qat_dh895xccvf/adf_dh895xccvf_hw_data.c

@@ -69,6 +69,7 @@ void adf_init_hw_data_dh895xcciov(struct adf_hw_device_data *hw_data)
 {
 	hw_data->dev_class = &dh895xcciov_class;
 	hw_data->num_banks = ADF_DH895XCCIOV_ETR_MAX_BANKS;
+	hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
 	hw_data->num_accel = ADF_DH895XCCIOV_MAX_ACCELERATORS;
 	hw_data->num_logical_accel = 1;
 	hw_data->num_engines = ADF_DH895XCCIOV_MAX_ACCELENGINES;