diff options
Diffstat (limited to 'recipes-kernel/most/files/0001-let-HDMs-do-the-coherent-memory-allocation.patch')
| -rw-r--r-- | recipes-kernel/most/files/0001-let-HDMs-do-the-coherent-memory-allocation.patch | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/recipes-kernel/most/files/0001-let-HDMs-do-the-coherent-memory-allocation.patch b/recipes-kernel/most/files/0001-let-HDMs-do-the-coherent-memory-allocation.patch new file mode 100644 index 00000000..b387faac --- /dev/null +++ b/recipes-kernel/most/files/0001-let-HDMs-do-the-coherent-memory-allocation.patch @@ -0,0 +1,140 @@ +From b4fe384dde3e230d8c252525fcd5297015b147d1 Mon Sep 17 00:00:00 2001 +From: Christian Gromm <christian.gromm@microchip.com> +Date: Wed, 2 Aug 2017 14:51:20 +0200 +Subject: [PATCH 1/5] let HDMs do the coherent memory allocation + +On arm64/aarch64 architectures the allocation of coherent memory +needs a device that has the dma_ops proberly set. That's why the +core module of the MOST driver is no longer able to allocate this +kind of memory. This patch moves the allocation process down to +the HDM layer where the proper devices exist in either the USB +host controller or the platform device. + +Signed-off-by: Christian Gromm <christian.gromm@microchip.com> + + +Signed-off-by: Christian Gromm <christian.gromm@microchip.com> +--- + driver/hdm-dim2/dim2_hdm.c | 12 ++++++++++++ + driver/hdm-usb/hdm_usb.c | 18 ++++++++++++++++++ + driver/include/mostcore.h | 2 ++ + driver/mostcore/core.c | 17 +++++++++++------ + 4 files changed, 43 insertions(+), 6 deletions(-) + +diff --git a/hdm-dim2/dim2_hdm.c b/hdm-dim2/dim2_hdm.c +index 35aee9f..1b164cf 100644 +--- a/hdm-dim2/dim2_hdm.c ++++ b/hdm-dim2/dim2_hdm.c +@@ -722,6 +722,16 @@ static int poison_channel(struct most_interface *most_iface, int ch_idx) + return ret; + } + ++static void *dma_alloc(struct mbo *mbo, u32 size) ++{ ++ return dma_alloc_coherent(NULL, size, &mbo->bus_address, GFP_KERNEL); ++} ++ ++static void dma_free(struct mbo *mbo, u32 size) ++{ ++ dma_free_coherent(NULL, size, mbo->virt_address, mbo->bus_address); ++} ++ + /* + * dim2_probe - dim2 probe handler + * @pdev: platform device structure +@@ -820,6 +830,8 @@ static int dim2_probe(struct platform_device *pdev) + dev->most_iface.channel_vector = dev->capabilities; + dev->most_iface.configure = configure_channel; + dev->most_iface.enqueue = enqueue; ++ dev->most_iface.dma_alloc = dma_alloc; ++ dev->most_iface.dma_free = dma_free; + dev->most_iface.poison_channel = poison_channel; + dev->most_iface.request_netinfo = request_netinfo; + +diff --git a/hdm-usb/hdm_usb.c b/hdm-usb/hdm_usb.c +index 3433646..0b689b5 100644 +--- a/hdm-usb/hdm_usb.c ++++ b/hdm-usb/hdm_usb.c +@@ -629,6 +629,22 @@ _error: + return retval; + } + ++static void *hdm_dma_alloc(struct mbo *mbo, u32 size) ++{ ++ struct most_dev *mdev = to_mdev(mbo->ifp); ++ ++ return usb_alloc_coherent(mdev->usb_device, size, GFP_KERNEL, ++ &mbo->bus_address); ++} ++ ++static void hdm_dma_free(struct mbo *mbo, u32 size) ++{ ++ struct most_dev *mdev = to_mdev(mbo->ifp); ++ ++ usb_free_coherent(mdev->usb_device, size, mbo->virt_address, ++ mbo->bus_address); ++} ++ + /** + * hdm_configure_channel - receive channel configuration from core + * @iface: interface +@@ -1140,6 +1156,8 @@ hdm_probe(struct usb_interface *interface, const struct usb_device_id *id) + mdev->iface.request_netinfo = hdm_request_netinfo; + mdev->iface.enqueue = hdm_enqueue; + mdev->iface.poison_channel = hdm_poison_channel; ++ mdev->iface.dma_alloc = hdm_dma_alloc; ++ mdev->iface.dma_free = hdm_dma_free; + mdev->iface.description = mdev->description; + mdev->iface.num_channels = num_endpoints; + +diff --git a/include/mostcore.h b/include/mostcore.h +index 5f8339b..deefe25 100644 +--- a/include/mostcore.h ++++ b/include/mostcore.h +@@ -241,6 +241,8 @@ struct most_interface { + const char *description; + int num_channels; + struct most_channel_capability *channel_vector; ++ void *(*dma_alloc)(struct mbo *mbo, u32 size); ++ void (*dma_free)(struct mbo *mbo, u32 size); + int (*configure)(struct most_interface *iface, int channel_idx, + struct most_channel_config *channel_config); + int (*enqueue)(struct most_interface *iface, int channel_idx, +diff --git a/mostcore/core.c b/mostcore/core.c +index 4c580d1..931efb9 100644 +--- a/mostcore/core.c ++++ b/mostcore/core.c +@@ -184,8 +184,10 @@ static void most_free_mbo_coherent(struct mbo *mbo) + struct most_c_obj *c = mbo->context; + u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len; + +- dma_free_coherent(NULL, coherent_buf_size, mbo->virt_address, +- mbo->bus_address); ++ if (c->iface->dma_free) ++ c->iface->dma_free(mbo, coherent_buf_size); ++ else ++ kfree(mbo->virt_address); + kfree(mbo); + if (atomic_sub_and_test(1, &c->mbo_ref)) + complete(&c->cleanup); +@@ -1289,10 +1291,13 @@ static int arm_mbo_chain(struct most_c_obj *c, int dir, + mbo->context = c; + mbo->ifp = c->iface; + mbo->hdm_channel_id = c->channel_id; +- mbo->virt_address = dma_alloc_coherent(NULL, +- coherent_buf_size, +- &mbo->bus_address, +- GFP_KERNEL); ++ if (c->iface->dma_alloc) { ++ mbo->virt_address = ++ c->iface->dma_alloc(mbo, coherent_buf_size); ++ } else { ++ mbo->virt_address = ++ kzalloc(coherent_buf_size, GFP_KERNEL); ++ } + if (!mbo->virt_address) { + pr_info("WARN: No DMA coherent buffer.\n"); + retval = i; +-- +2.7.4 + |