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nvme_drv: reduce state-change intervals

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- probe changes of CSTS.RDY every 20 ms
- check admin-queue completion every 50 ms
This commit is contained in:
Christian Helmuth 2023-03-20 16:00:32 +01:00
parent f7b910b298
commit 082d1780cf
1 changed files with 9 additions and 10 deletions
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17
repos/os/src/drivers/nvme/main.cc
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@ -39,12 +39,8 @@
namespace { namespace {
using namespace Genode;
using uint16_t = Genode::uint16_t;
using uint32_t = Genode::uint32_t;
using uint64_t = Genode::uint64_t;
using size_t = Genode::size_t;
using addr_t = Genode::addr_t;
using Response = Block::Request_stream::Response; using Response = Block::Request_stream::Response;
} /* anonymous namespace */ } /* anonymous namespace */
@ -894,9 +890,12 @@ class Nvme::Controller : Platform::Device,
*/ */
void _wait_for_rdy(unsigned val) void _wait_for_rdy(unsigned val)
{ {
enum { MAX = 50u, TO_UNIT = 500u, }; enum { INTERVAL = 20'000u, TO_UNIT = 500'000u }; /* microseconds */
Attempts const a(MAX);
Microseconds const t(((uint64_t)read<Cap::To>() * TO_UNIT) * (1000 / MAX)); unsigned const to { (unsigned)read<Cap::To>() * TO_UNIT };
Attempts const a { to / INTERVAL };
Microseconds const t { INTERVAL };
try { try {
wait_for(a, t, _delayer, Csts::Rdy::Equal(val)); wait_for(a, t, _delayer, Csts::Rdy::Equal(val));
} catch (Mmio::Polling_timeout) { } catch (Mmio::Polling_timeout) {
@ -1008,7 +1007,7 @@ class Nvme::Controller : Platform::Device,
TO const &timeout) TO const &timeout)
{ {
for (uint32_t i = 0; i < num; i++) { for (uint32_t i = 0; i < num; i++) {
_delayer.usleep(100 * 1000); _delayer.usleep(50 * 1000);
Cqe b(_admin_cq->next()); Cqe b(_admin_cq->next());