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misc: fastrpc: Add support for audiopd
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In order to be able to start the adsp listener for audiopd using adsprpcd,
we need to add the corresponding ioctl for creating a static process.
On that ioctl call we need to allocate the heap. Allocating the heap needs
to be happening only once and needs to be kept between different device
open calls, so attach it to the channel context to make sure that remains
until the RPMSG driver is removed. Then, if there are any VMIDs associated
with the static ADSP process, do a call to SCM to assign it.
And then, send all the necessary info related to heap to the DSP.

Co-developed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221125071405.148786-8-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Abel Vesa authored and Greg Kroah-Hartman committed Nov 25, 2022
1 parent 72fa6f7 commit 0871561
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135 changes: 135 additions & 0 deletions drivers/misc/fastrpc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,20 @@
#define FASTRPC_DSP_UTILITIES_HANDLE 2
#define FASTRPC_CTXID_MASK (0xFF0)
#define INIT_FILELEN_MAX (2 * 1024 * 1024)
#define INIT_FILE_NAMELEN_MAX (128)
#define FASTRPC_DEVICE_NAME "fastrpc"

/* Add memory to static PD pool, protection thru XPU */
#define ADSP_MMAP_HEAP_ADDR 4
/* MAP static DMA buffer on DSP User PD */
#define ADSP_MMAP_DMA_BUFFER 6
/* Add memory to static PD pool protection thru hypervisor */
#define ADSP_MMAP_REMOTE_HEAP_ADDR 8
/* Add memory to userPD pool, for user heap */
#define ADSP_MMAP_ADD_PAGES 0x1000
/* Add memory to userPD pool, for LLC heap */
#define ADSP_MMAP_ADD_PAGES_LLC 0x3000,

#define DSP_UNSUPPORTED_API (0x80000414)
/* MAX NUMBER of DSP ATTRIBUTES SUPPORTED */
#define FASTRPC_MAX_DSP_ATTRIBUTES (256)
Expand Down Expand Up @@ -72,6 +84,7 @@
FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)

#define FASTRPC_CREATE_PROCESS_NARGS 6
#define FASTRPC_CREATE_STATIC_PROCESS_NARGS 3
/* Remote Method id table */
#define FASTRPC_RMID_INIT_ATTACH 0
#define FASTRPC_RMID_INIT_RELEASE 1
Expand Down Expand Up @@ -261,6 +274,7 @@ struct fastrpc_channel_ctx {
u32 dsp_attributes[FASTRPC_MAX_DSP_ATTRIBUTES];
struct fastrpc_device *secure_fdevice;
struct fastrpc_device *fdevice;
struct fastrpc_buf *remote_heap;
bool secure;
bool unsigned_support;
};
Expand Down Expand Up @@ -1157,6 +1171,7 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
spin_unlock(&fl->lock);
fastrpc_context_put(ctx);
}

if (err)
dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);

Expand All @@ -1181,6 +1196,120 @@ static bool is_session_rejected(struct fastrpc_user *fl, bool unsigned_pd_reques
return false;
}

static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
char __user *argp)
{
struct fastrpc_init_create_static init;
struct fastrpc_invoke_args *args;
struct fastrpc_phy_page pages[1];
char *name;
int err;
struct {
int pgid;
u32 namelen;
u32 pageslen;
} inbuf;
u32 sc;

args = kcalloc(FASTRPC_CREATE_STATIC_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
if (!args)
return -ENOMEM;

if (copy_from_user(&init, argp, sizeof(init))) {
err = -EFAULT;
goto err;
}

if (init.namelen > INIT_FILE_NAMELEN_MAX) {
err = -EINVAL;
goto err;
}

name = kzalloc(init.namelen, GFP_KERNEL);
if (!name) {
err = -ENOMEM;
goto err;
}

if (copy_from_user(name, (void __user *)(uintptr_t)init.name, init.namelen)) {
err = -EFAULT;
goto err_name;
}

if (!fl->cctx->remote_heap) {
err = fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen,
&fl->cctx->remote_heap);
if (err)
goto err_name;

/* Map if we have any heap VMIDs associated with this ADSP Static Process. */
if (fl->cctx->vmcount) {
unsigned int perms = BIT(QCOM_SCM_VMID_HLOS);

err = qcom_scm_assign_mem(fl->cctx->remote_heap->phys,
(u64)fl->cctx->remote_heap->size, &perms,
fl->cctx->vmperms, fl->cctx->vmcount);
if (err) {
dev_err(fl->sctx->dev, "Failed to assign memory with phys 0x%llx size 0x%llx err %d",
fl->cctx->remote_heap->phys, fl->cctx->remote_heap->size, err);
goto err_map;
}
}
}

inbuf.pgid = fl->tgid;
inbuf.namelen = init.namelen;
inbuf.pageslen = 0;
fl->pd = USER_PD;

args[0].ptr = (u64)(uintptr_t)&inbuf;
args[0].length = sizeof(inbuf);
args[0].fd = -1;

args[1].ptr = (u64)(uintptr_t)name;
args[1].length = inbuf.namelen;
args[1].fd = -1;

pages[0].addr = fl->cctx->remote_heap->phys;
pages[0].size = fl->cctx->remote_heap->size;

args[2].ptr = (u64)(uintptr_t) pages;
args[2].length = sizeof(*pages);
args[2].fd = -1;

sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_STATIC, 3, 0);

err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
sc, args);
if (err)
goto err_invoke;

kfree(args);

return 0;
err_invoke:
if (fl->cctx->vmcount) {
struct qcom_scm_vmperm perm;

perm.vmid = QCOM_SCM_VMID_HLOS;
perm.perm = QCOM_SCM_PERM_RWX;
err = qcom_scm_assign_mem(fl->cctx->remote_heap->phys,
(u64)fl->cctx->remote_heap->size,
&(fl->cctx->vmperms[0].vmid), &perm, 1);
if (err)
dev_err(fl->sctx->dev, "Failed to assign memory phys 0x%llx size 0x%llx err %d",
fl->cctx->remote_heap->phys, fl->cctx->remote_heap->size, err);
}
err_map:
fastrpc_buf_free(fl->cctx->remote_heap);
err_name:
kfree(name);
err:
kfree(args);

return err;
}

static int fastrpc_init_create_process(struct fastrpc_user *fl,
char __user *argp)
{
Expand Down Expand Up @@ -1915,6 +2044,9 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
case FASTRPC_IOCTL_INIT_ATTACH_SNS:
err = fastrpc_init_attach(fl, SENSORS_PD);
break;
case FASTRPC_IOCTL_INIT_CREATE_STATIC:
err = fastrpc_init_create_static_process(fl, argp);
break;
case FASTRPC_IOCTL_INIT_CREATE:
err = fastrpc_init_create_process(fl, argp);
break;
Expand Down Expand Up @@ -2184,6 +2316,9 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
if (cctx->secure_fdevice)
misc_deregister(&cctx->secure_fdevice->miscdev);

if (cctx->remote_heap)
fastrpc_buf_free(cctx->remote_heap);

of_platform_depopulate(&rpdev->dev);

cctx->rpdev = NULL;
Expand Down
7 changes: 7 additions & 0 deletions include/uapi/misc/fastrpc.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#define FASTRPC_IOCTL_MMAP _IOWR('R', 6, struct fastrpc_req_mmap)
#define FASTRPC_IOCTL_MUNMAP _IOWR('R', 7, struct fastrpc_req_munmap)
#define FASTRPC_IOCTL_INIT_ATTACH_SNS _IO('R', 8)
#define FASTRPC_IOCTL_INIT_CREATE_STATIC _IOWR('R', 9, struct fastrpc_init_create_static)
#define FASTRPC_IOCTL_MEM_MAP _IOWR('R', 10, struct fastrpc_mem_map)
#define FASTRPC_IOCTL_MEM_UNMAP _IOWR('R', 11, struct fastrpc_mem_unmap)
#define FASTRPC_IOCTL_GET_DSP_INFO _IOWR('R', 13, struct fastrpc_ioctl_capability)
Expand Down Expand Up @@ -87,6 +88,12 @@ struct fastrpc_init_create {
__u64 file; /* pointer to elf file */
};

struct fastrpc_init_create_static {
__u32 namelen; /* length of pd process name */
__u32 memlen;
__u64 name; /* pd process name */
};

struct fastrpc_alloc_dma_buf {
__s32 fd; /* fd */
__u32 flags; /* flags to map with */
Expand Down

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