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envelope-from=figlesia@xilinx.com; helo=NAM11-CO1-obe.outbound.protection.outlook.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: edgar.iglesias@xilinx.com, peter.maydell@linaro.org, frasse.iglesias@gmail.com, alistair@alistair23.me, alistair23@gmail.com, philmd@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add an interface for controlling DMA models that are reused with other models. This allows a controlling model to start transfers through the DMA while reusing the DMA's handling of transfer state and completion signaling. Signed-off-by: Francisco Iglesias Reviewed-by: Edgar E. Iglesias --- hw/dma/dma-ctrl.c | 31 ++++++++++++++++++++ hw/dma/meson.build | 1 + include/hw/dma/dma-ctrl.h | 74 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+) create mode 100644 hw/dma/dma-ctrl.c create mode 100644 include/hw/dma/dma-ctrl.h diff --git a/hw/dma/dma-ctrl.c b/hw/dma/dma-ctrl.c new file mode 100644 index 0000000000..4a9b68dac1 --- /dev/null +++ b/hw/dma/dma-ctrl.c @@ -0,0 +1,31 @@ +/* + * DMA control interface. + * + * Copyright (c) 2021 Xilinx Inc. + * Written by Francisco Iglesias + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include "qemu/osdep.h" +#include "exec/hwaddr.h" +#include "hw/dma/dma-ctrl.h" + +void dma_ctrl_read_with_notify(DmaCtrl *dma_ctrl, hwaddr addr, uint32_t len, + DmaCtrlNotify *notify, bool start_dma) +{ + DmaCtrlClass *dcc = DMA_CTRL_GET_CLASS(dma_ctrl); + dcc->read(dma_ctrl, addr, len, notify, start_dma); +} + +static const TypeInfo dma_ctrl_info = { + .name = TYPE_DMA_CTRL, + .parent = TYPE_INTERFACE, + .class_size = sizeof(DmaCtrlClass), +}; + +static void dma_ctrl_register_types(void) +{ + type_register_static(&dma_ctrl_info); +} + +type_init(dma_ctrl_register_types) diff --git a/hw/dma/meson.build b/hw/dma/meson.build index f3f0661bc3..c0bc134046 100644 --- a/hw/dma/meson.build +++ b/hw/dma/meson.build @@ -14,3 +14,4 @@ softmmu_ss.add(when: 'CONFIG_PXA2XX', if_true: files('pxa2xx_dma.c')) softmmu_ss.add(when: 'CONFIG_RASPI', if_true: files('bcm2835_dma.c')) softmmu_ss.add(when: 'CONFIG_SIFIVE_PDMA', if_true: files('sifive_pdma.c')) softmmu_ss.add(when: 'CONFIG_XLNX_CSU_DMA', if_true: files('xlnx_csu_dma.c')) +common_ss.add(when: 'CONFIG_XILINX_AXI', if_true: files('dma-ctrl.c')) diff --git a/include/hw/dma/dma-ctrl.h b/include/hw/dma/dma-ctrl.h new file mode 100644 index 0000000000..498469395f --- /dev/null +++ b/include/hw/dma/dma-ctrl.h @@ -0,0 +1,74 @@ +/* + * DMA control interface. + * + * Copyright (c) 2021 Xilinx Inc. + * Written by Francisco Iglesias + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#ifndef HW_DMA_CTRL_H +#define HW_DMA_CTRL_H + +#include "qemu-common.h" +#include "hw/hw.h" +#include "qom/object.h" + +#define TYPE_DMA_CTRL "dma-ctrl" + +#define DMA_CTRL_CLASS(klass) \ + OBJECT_CLASS_CHECK(DmaCtrlClass, (klass), TYPE_DMA_CTRL) +#define DMA_CTRL_GET_CLASS(obj) \ + OBJECT_GET_CLASS(DmaCtrlClass, (obj), TYPE_DMA_CTRL) +#define DMA_CTRL(obj) \ + INTERFACE_CHECK(DmaCtrl, (obj), TYPE_DMA_CTRL) + +typedef void (*dmactrl_notify_fn)(void *opaque); + +typedef struct DmaCtrlNotify { + void *opaque; + dmactrl_notify_fn cb; +} DmaCtrlNotify; + +typedef struct DmaCtrl { + Object Parent; +} DmaCtrl; + +typedef struct DmaCtrlClass { + InterfaceClass parent; + + /* + * read: Start a read transfer on the DMA implementing the DMA control + * interface + * + * @dma_ctrl: the DMA implementing this interface + * @addr: the address to read + * @len: the amount of bytes to read at 'addr' + * @notify: the structure containg a callback to call and opaque pointer + * to pass the callback when the transfer has been completed + * @start_dma: true for starting the DMA transfer and false for just + * refilling and proceding an already started transfer + */ + void (*read)(DmaCtrl *dma_ctrl, hwaddr addr, uint32_t len, + DmaCtrlNotify *notify, bool start_dma); +} DmaCtrlClass; + +/* + * Start a read transfer on a DMA implementing the DMA control interface. + * The DMA will notify the caller that 'len' bytes have been read at 'addr' + * through the callback in the DmaCtrlNotify structure. For allowing refilling + * an already started transfer the DMA notifies the caller before considering + * the transfer done (e.g. before setting done flags, generating IRQs and + * modifying other relevant internal device state). + * + * @dma_ctrl: the DMA implementing this interface + * @addr: the address to read + * @len: the amount of bytes to read at 'addr' + * @notify: the structure containing a callback to call and opaque pointer + * to pass the callback when the transfer has been completed + * @start_dma: true for starting the DMA transfer and false for just + * refilling and proceding an already started transfer + */ +void dma_ctrl_read_with_notify(DmaCtrl *dma_ctrl, hwaddr addr, uint32_t len, + DmaCtrlNotify *notify, bool start_dma); + +#endif /* HW_DMA_CTRL_H */